From patchwork Fri Jan 13 17:10:01 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43442 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp386301wrt; Fri, 13 Jan 2023 09:13:56 -0800 (PST) X-Google-Smtp-Source: AMrXdXuRIBbqz9QrlZO8MyV8MyPoQVo8SYx3IcL2+HcKTIsY2LYrkt4skxXNOBDojs0uPItb0JQY X-Received: by 2002:a50:a401:0:b0:46d:53d7:d21e with SMTP id u1-20020a50a401000000b0046d53d7d21emr73595618edb.27.1673630036289; Fri, 13 Jan 2023 09:13:56 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630036; cv=none; d=google.com; s=arc-20160816; b=E5Nhc53eDGQZ1LW+JHlHf2yMtB8zOMLcLJNehfpB5iqDFO+ljKG4TF5tp1S8ateIsT b69kz0lPCSlabK2l4b4GdzprxdUQ1Z6LvudzSlY604JSPqfaHMg7KL5w7noD36t+ZXUQ lJMCR64spClEiKU1tJAhSgBJvMmbLMV3r152bztObf2qefnMTAKfWQ292bHB7i9okLwg enjD5kz4CpkjpMl9rP98OteVZXy9W/GCZMOj/Q2eeQzXiYFBdzJvzRKQQKtFnTHwe6eU Y4RTGDVWooaozkxKlKRWaa7Klp9Kj5sq9A7wvH+Kf7D/ofxU0Z3X9Iom+xiwnX/5JnSr PzNQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=rXiyu4T9E3cHd7BmjOKGfZSf96+T1UTdr6M/Zzcd1iA=; b=ik8ffysy20Nfdx3C5A85NDq1L5vm40jUF5s1E9JSFHiM+Fqo5SA0+YlPX0THTqtgKw wFGfb5PiKjBd+RM4m4Ev8NUk5oe8ottTAX71TfxJdhhtPgJ0ZNd7B0dAoWO8npyjbkay 7GzRQcYBU8XXlbmPaMJsrcHarYpx4sF1bEEaOmbOwxOqrSA8iI9+dZebvBfDPDo15sKx iEI1mkQ7TbKlJgymwXMWsq9tSDuXY3HLJQKQ2zvguCxsc4Dceq24SmoQC0zSGgnl2BdA QqIJHknCtkeTE1WWjPzh5xcKaJyHyOL3eaauSOQd82eBV26msKto16HO5JlTocePP4vl FilQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=XkRuEwri; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id dk11-20020a0564021d8b00b00461acb2deebsi1147390edb.198.2023.01.13.09.13.32; Fri, 13 Jan 2023 09:13:56 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=XkRuEwri; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229641AbjAMRMd (ORCPT + 99 others); Fri, 13 Jan 2023 12:12:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53220 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229631AbjAMRMY (ORCPT ); Fri, 13 Jan 2023 12:12:24 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AF72D41D4F for ; Fri, 13 Jan 2023 09:10:58 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629857; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=rXiyu4T9E3cHd7BmjOKGfZSf96+T1UTdr6M/Zzcd1iA=; b=XkRuEwriGx+ie1NUgv4flZ9Q2/luLh2sa5I4RVwqe6re/quUcuWF8FYLA9qSyJr+zhKl77 iJgpFxz4cKPvFNZqpO4OCzoDPm47CmsYDO49Zmz8zO0zDGJIL4XC7w/is3IpFBfcanQqhX joZJcIzp4uuzzN4y6guXbpoNbPq/b6Q= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-131-UP7pYWA7N8-Lxng6Qfiptg-1; Fri, 13 Jan 2023 12:10:53 -0500 X-MC-Unique: UP7pYWA7N8-Lxng6Qfiptg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E39ED3C0D195; Fri, 13 Jan 2023 17:10:51 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8457040C2064; Fri, 13 Jan 2023 17:10:44 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand Subject: [PATCH mm-unstable v1 01/26] mm/debug_vm_pgtable: more pte_swp_exclusive() sanity checks Date: Fri, 13 Jan 2023 18:10:01 +0100 Message-Id: <20230113171026.582290-2-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928288672188875?= X-GMAIL-MSGID: =?utf-8?q?1754928288672188875?= We want to implement __HAVE_ARCH_PTE_SWP_EXCLUSIVE on all architectures. Let's extend our sanity checks, especially testing that our PTE bit does not affect: * is_swap_pte() -> pte_present() and pte_none() * the swap entry + type * pte_swp_soft_dirty() Especially, the pfn_pte() is dodgy when the swap PTE layout differs heavily from ordinary PTEs. Let's properly construct a swap PTE from swap type+offset. Signed-off-by: David Hildenbrand Reported-by: kernel test robot Signed-off-by: David Hildenbrand --- mm/debug_vm_pgtable.c | 23 ++++++++++++++++++++++- 1 file changed, 22 insertions(+), 1 deletion(-) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index bb3328f46126..a0730beffd78 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -811,13 +811,34 @@ static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) { #ifdef __HAVE_ARCH_PTE_SWP_EXCLUSIVE - pte_t pte = pfn_pte(args->fixed_pte_pfn, args->page_prot); + unsigned long max_swapfile_size = generic_max_swapfile_size(); + swp_entry_t entry, entry2; + pte_t pte; pr_debug("Validating PTE swap exclusive\n"); + + /* Create a swp entry with all possible bits set */ + entry = swp_entry((1 << MAX_SWAPFILES_SHIFT) - 1, + max_swapfile_size - 1); + + pte = swp_entry_to_pte(entry); + WARN_ON(pte_swp_exclusive(pte)); + WARN_ON(!is_swap_pte(pte)); + entry2 = pte_to_swp_entry(pte); + WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); + pte = pte_swp_mkexclusive(pte); WARN_ON(!pte_swp_exclusive(pte)); + WARN_ON(!is_swap_pte(pte)); + WARN_ON(pte_swp_soft_dirty(pte)); + entry2 = pte_to_swp_entry(pte); + WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); + pte = pte_swp_clear_exclusive(pte); WARN_ON(pte_swp_exclusive(pte)); + WARN_ON(!is_swap_pte(pte)); + entry2 = pte_to_swp_entry(pte); + WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); #endif /* __HAVE_ARCH_PTE_SWP_EXCLUSIVE */ } From patchwork Fri Jan 13 17:10:02 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43441 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp386299wrt; Fri, 13 Jan 2023 09:13:56 -0800 (PST) X-Google-Smtp-Source: AMrXdXtRLE72ML82NZJaQMcwlKn9gpL9kZHTpnWkdMvFjZG8pLeg0dY+L98vqSHcdeyRBOGrzIsr X-Received: by 2002:a05:6402:494:b0:49b:b1ab:f216 with SMTP id k20-20020a056402049400b0049bb1abf216mr4671839edv.11.1673630036175; Fri, 13 Jan 2023 09:13:56 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630036; cv=none; d=google.com; s=arc-20160816; b=oh6Wjb65C0PRfsQ931bxW4cYnxmfwqb3qPhzUc49zCb0hLGYhP3uZa7J5FifThkMG6 OcedXVPMhTm7WiMDVV/9aSUkwTB0TTb16vVBHDcSLl3PuGDvebrv3DefMu00j7o9s/fP ACAbgOdhnw8FodYiaJtFyflwBXpEMy0QemeHSevdyiBsP3Y6xB1tVD9V8kuOsuL4I5T4 So6XbXOWO7qo5p4O1oYXkLMJIS5cj+PxbhKyyZ3hyFqjppYat2O9iyjAG6x+eE52QOlG XVBLPm57JFYrlqKEfTJP7bWtT6aYCFK6OIXrb1M14mc6jLnlEMRUj7gwko15cZb7EBzk /iPw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=5U3pYo5y6zzHhtAhfPB+ppqMEJelTMM0ZMYgpBnRMmY=; b=tLgK5w0ZQwQSf/uGmwqsyGBOdRTDJYjPizFp92n10v8IBWAo9MvVq+O2LuP4j6njdK qZvmD5WNiVWpXL7tju4ZNwzk4rXx11ojdKQQdY2kTbaIvBq18oRQzJxKT3zcvMXn60vI EywBVE8mF9E73/f6vobp1uWtCdrTDNPJS8o1ZWE2Fzw4PkjjTr4EXCYKQR5N4m9WAMVP h7a4UYP71KchMmRzuN6n8dLgezNM6aw1c9LuYZ++l4DUSIgKfnAtH8wwjB1V0IZvNJ+N JSApo46pdiekkJ9PNoCeakLr9aw4FCVghukMYlGVCESJ1FHt0cfYJH8x5n44G1QYHOTL 54Yg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=R7fQpupZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id oq19-20020a170906cc9300b007f1501a8c24si17850754ejb.216.2023.01.13.09.13.32; Fri, 13 Jan 2023 09:13:56 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=R7fQpupZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229798AbjAMRM6 (ORCPT + 99 others); Fri, 13 Jan 2023 12:12:58 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53500 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229726AbjAMRMz (ORCPT ); Fri, 13 Jan 2023 12:12:55 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 9E02988A21 for ; Fri, 13 Jan 2023 09:11:06 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629865; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=5U3pYo5y6zzHhtAhfPB+ppqMEJelTMM0ZMYgpBnRMmY=; b=R7fQpupZJTyaz/HwNgmX2XeNoJHXWI6tVrCqPHolO8dDvN6UXZ4BgF7FHzFiWiSTQtX3QP pfzf7wRp9AVY6/YAylMicWCK//kIOh9lwU7+N5LoJhsZY9xcdnWLevWnD3h6iz7aMQwln6 ZwixFJxn5i6DhE19h4pFdOGikqmMmgE= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-623-lgz3QbC4OT6mzf0WDlrJUQ-1; Fri, 13 Jan 2023 12:11:01 -0500 X-MC-Unique: lgz3QbC4OT6mzf0WDlrJUQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E6F651C05136; Fri, 13 Jan 2023 17:10:59 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5142640C2064; Fri, 13 Jan 2023 17:10:52 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Richard Henderson , Ivan Kokshaysky , Matt Turner Subject: [PATCH mm-unstable v1 02/26] alpha/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:02 +0100 Message-Id: <20230113171026.582290-3-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928288901522073?= X-GMAIL-MSGID: =?utf-8?q?1754928288901522073?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. While at it, mask the type in mk_swap_pte() as well. Cc: Richard Henderson Cc: Ivan Kokshaysky Cc: Matt Turner Signed-off-by: David Hildenbrand --- arch/alpha/include/asm/pgtable.h | 41 ++++++++++++++++++++++++++++---- 1 file changed, 37 insertions(+), 4 deletions(-) diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index 9e45f6735d5d..970abf511b13 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -74,6 +74,9 @@ struct vm_area_struct; #define _PAGE_DIRTY 0x20000 #define _PAGE_ACCESSED 0x40000 +/* We borrow bit 39 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x8000000000UL + /* * NOTE! The "accessed" bit isn't necessarily exact: it can be kept exactly * by software (use the KRE/URE/KWE/UWE bits appropriately), but I'll fake it. @@ -301,18 +304,48 @@ extern inline void update_mmu_cache(struct vm_area_struct * vma, } /* - * Non-present pages: high 24 bits are offset, next 8 bits type, - * low 32 bits zero. + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <------------------- offset ------------------> E <--- type --> + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <--------------------------- zeroes --------------------------> + * + * E is the exclusive marker that is not stored in swap entries. */ extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) -{ pte_t pte; pte_val(pte) = (type << 32) | (offset << 40); return pte; } +{ pte_t pte; pte_val(pte) = ((type & 0x7f) << 32) | (offset << 40); return pte; } -#define __swp_type(x) (((x).val >> 32) & 0xff) +#define __swp_type(x) (((x).val >> 32) & 0x7f) #define __swp_offset(x) ((x).val >> 40) #define __swp_entry(type, off) ((swp_entry_t) { pte_val(mk_swap_pte((type), (off))) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #define pte_ERROR(e) \ printk("%s:%d: bad pte %016lx.\n", __FILE__, __LINE__, pte_val(e)) #define pmd_ERROR(e) \ From patchwork Fri Jan 13 17:10:03 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43443 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp386404wrt; Fri, 13 Jan 2023 09:14:11 -0800 (PST) X-Google-Smtp-Source: AMrXdXtztvBe3OFMMiyhAme6mxT5OCQZYGD2gDo8DNjP1pma+flm8G4YdosijpC7jda0M79AZJjb X-Received: by 2002:a17:906:d117:b0:84d:1500:abde with SMTP id b23-20020a170906d11700b0084d1500abdemr3983201ejz.73.1673630051293; Fri, 13 Jan 2023 09:14:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630051; cv=none; d=google.com; s=arc-20160816; b=zYEHtv2+nUrILqXf/WkjX43jWv+D7jn72vgHOMDho6K6hzUFruEMviAp7zi8OFs236 9QGqRfvdg0xcbvNJNI9GN7KuOVKHXh2QnoHXgXD6EYGCGhQjj9G4FQvBfCvW4UTkFID6 y2AKqBEBQGBfSoYKJsLPp0/nSwrUBpjEGK+UgyLGNbsmGhVU2F21yWQ7GtpNdd3VaXmS ZmbtXPMLSi+BokMr49Rd4ShfD/5E0J/SuAcRXv1SRcZ/hzh1aaDyGkDL/bD43zsDQyWz S3eMBHLfognoE6puOU+NZIKeiKRu4xbO5czCHNPysuDE2NwcTxqo0rUHN0TaWg8D/UZ+ EE2g== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=CsZI6CBJjkMgqSDB0pNEUq6oiZDvtrxY4s2APwPC8ec=; b=dG1bLMcYHYm1DP/wIiTzA8wav4mjQXg0an+B05ZxJ1veZqU2tCAbKmAu5SbZCE4jte cISCSaNvCzqS+YKdpGi5UqE/SNqJca+EwozqjTzH9IyccXTfrhPPpIZXBzrZRX2uZ835 QAO3W5dyWueAI6HEmtRE3EfOtj3nUgYduhOMipoKPvIfLtFNwvaR8rcVPwOQKx48cBIT PQjdVC4LsB0Vw6xNcJ/lM1WxcTQzR6yxCHyJEL4lE5i+qMjRmB7wKMhaPPhfQ/uzipDk Vcji/Wiv5SYYfoq0JZfbzM4LZ30mzEJsS+Nm5ap2rPUc3HN2Oz64YCMSdlDH5TPsNvUx izRg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Lu+hGEvU; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id v18-20020a1709064e9200b007f0e3370f87si17171790eju.297.2023.01.13.09.13.47; Fri, 13 Jan 2023 09:14:11 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Lu+hGEvU; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229861AbjAMRNJ (ORCPT + 99 others); Fri, 13 Jan 2023 12:13:09 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53138 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229809AbjAMRNE (ORCPT ); Fri, 13 Jan 2023 12:13:04 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3404F88A2B for ; Fri, 13 Jan 2023 09:11:10 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629869; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=CsZI6CBJjkMgqSDB0pNEUq6oiZDvtrxY4s2APwPC8ec=; b=Lu+hGEvUxsuX6r/SOmQehHWN73U1MFMX2bdGcum5DIlgcSwf1h+NB8oWFdtOJwrScMdaqy XfuRrLF/Td00/BQBAZYCry81GPAP1xQIqAiHEPn+5u80au9k/rABRMAD2Tn5Tiji1BjvVx f5QYblUYYSTs+DXgpQzLZkhIEbnsm8E= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-226-ElAanbZ3Nt6z3bJp0Ss8PQ-1; Fri, 13 Jan 2023 12:11:08 -0500 X-MC-Unique: ElAanbZ3Nt6z3bJp0Ss8PQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id A512010113C2; Fri, 13 Jan 2023 17:11:06 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7DEC840C2064; Fri, 13 Jan 2023 17:11:00 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Vineet Gupta Subject: [PATCH mm-unstable v1 03/26] arc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:03 +0100 Message-Id: <20230113171026.582290-4-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928304389152501?= X-GMAIL-MSGID: =?utf-8?q?1754928304389152501?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using bit 5, which is yet unused. The only important parts seems to be to not use _PAGE_PRESENT (bit 9). Cc: Vineet Gupta Signed-off-by: David Hildenbrand --- arch/arc/include/asm/pgtable-bits-arcv2.h | 27 ++++++++++++++++++++--- 1 file changed, 24 insertions(+), 3 deletions(-) diff --git a/arch/arc/include/asm/pgtable-bits-arcv2.h b/arch/arc/include/asm/pgtable-bits-arcv2.h index 515e82db519f..611f412713b9 100644 --- a/arch/arc/include/asm/pgtable-bits-arcv2.h +++ b/arch/arc/include/asm/pgtable-bits-arcv2.h @@ -26,6 +26,9 @@ #define _PAGE_GLOBAL (1 << 8) /* ASID agnostic (H) */ #define _PAGE_PRESENT (1 << 9) /* PTE/TLB Valid (H) */ +/* We borrow bit 5 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_DIRTY + #ifdef CONFIG_ARC_MMU_V4 #define _PAGE_HW_SZ (1 << 10) /* Normal/super (H) */ #else @@ -106,9 +109,18 @@ static inline void set_pte_at(struct mm_struct *mm, unsigned long addr, void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, pte_t *ptep); -/* Encode swap {type,off} tuple into PTE - * We reserve 13 bits for 5-bit @type, keeping bits 12-5 zero, ensuring that - * PAGE_PRESENT is zero in a PTE holding swap "identifier" +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <-------------- offset -------------> <--- zero --> E < type -> + * + * E is the exclusive marker that is not stored in swap entries. + * The zero'ed bits include _PAGE_PRESENT. */ #define __swp_entry(type, off) ((swp_entry_t) \ { ((type) & 0x1f) | ((off) << 13) }) @@ -120,6 +132,15 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +PTE_BIT_FUNC(swp_mkexclusive, |= (_PAGE_SWP_EXCLUSIVE)); +PTE_BIT_FUNC(swp_clear_exclusive, &= ~(_PAGE_SWP_EXCLUSIVE)); + #ifdef CONFIG_TRANSPARENT_HUGEPAGE #include #endif From patchwork Fri Jan 13 17:10:04 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43444 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp386547wrt; Fri, 13 Jan 2023 09:14:24 -0800 (PST) X-Google-Smtp-Source: AMrXdXv9rtpeZId9ExW2DNhvjLtDCV9QpvuhPwHnKpUcn287lY4VtvgIJBmz3QV3LsfoMUD1hQoB X-Received: by 2002:a05:6402:430b:b0:499:70a8:f91d with SMTP id m11-20020a056402430b00b0049970a8f91dmr26266705edc.2.1673630064711; Fri, 13 Jan 2023 09:14:24 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630064; cv=none; d=google.com; s=arc-20160816; b=jChnpL7DTBP8GUg5VRyl4WJ+WtmEL+B+rO/vkJChl8gIHlMNjZ0AzEA4raPd3rWvRs DSwmjI0OccxY1VdeNdTW+1sLeBoBQe6LllotpAzlHyeahyHoUoS1EE4JH2qA0nAtdDrk kXUvOK6hK5K6bcsRc1dRWgc0Re4fper53jnjmIJ0UmC/5YezDoLLWdI9ha6N+fITPdQk hYRSEVIMn4ODNNDD1WXuKvj9kuLAXTqL9BIpTFF80oomRKpEN3m8sNVgbNdB1sg+0lS3 kOvLg3VoSiVA1kKXxlWVXtYp39DK1+M01XEMxhz30fwtD5P6b2fwSQ6YCb8exSlbLNhq ypDw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=tZj4FS3+eH3k8U+2o1kgh0Nnr8qiKFynHsnxPGTLDn0=; b=DJQsc/C/SPXjNq3DrC/uIS3Oi5Xe/eltBZP/FrRmAXA+pHHx1zt1c+MMMz2GtpwHda /2O03n1ZrDBUrfj1ZjjBSVVpIcBz4EWFh9KAtqy8195V9yImbo5YDr2BPiMSJVQGfl7J 2zZx9/kBZOTHNUOTnYhl7frImsBWFA1/fV/rnXC2NQaG1XhfuGGcDi10b6WHtwoyiQyN zVh1wnEJU/bNB5aPzN5/dyD1aVudu0dKST/urOoFi9vC2jf/xy4vtGdCw7DftmsbH+eS IRUz29e585ditUQ9nJaQLlrtxJe6FnklWibXtMVYY7p9lWvXzfkpUn2busvo3YvzoRzp w2Hg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=PpHiiXVl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id cm25-20020a0564020c9900b0049b5d6f6711si4610867edb.255.2023.01.13.09.14.00; Fri, 13 Jan 2023 09:14:24 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=PpHiiXVl; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229868AbjAMRNg (ORCPT + 99 others); Fri, 13 Jan 2023 12:13:36 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229654AbjAMRNJ (ORCPT ); Fri, 13 Jan 2023 12:13:09 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 0289A88DCA for ; Fri, 13 Jan 2023 09:11:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629878; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tZj4FS3+eH3k8U+2o1kgh0Nnr8qiKFynHsnxPGTLDn0=; b=PpHiiXVlCFnwll4QH8pakxJ5z1waJPx0yld+ZU5w/GRL4EgWb6SgdcW0xPK6bVypL41Ro/ 4KEQ0XtNomq8GdWyW6dRiyONaJrH3aoqbGnh/9w9WZ3QfYoa5rWyVZoRok5yxldZI78QNl DxR4j1mE3CvPxu8OMIprNhfspd4MElg= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-104-hBWEIBOUMXubvNcoEzKBLg-1; Fri, 13 Jan 2023 12:11:15 -0500 X-MC-Unique: hBWEIBOUMXubvNcoEzKBLg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 8299E101A55E; Fri, 13 Jan 2023 17:11:14 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 121D440C2064; Fri, 13 Jan 2023 17:11:06 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Russell King Subject: [PATCH mm-unstable v1 04/26] arm/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:04 +0100 Message-Id: <20230113171026.582290-5-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928318964221804?= X-GMAIL-MSGID: =?utf-8?q?1754928318964221804?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the offset. This reduces the maximum swap space per file to 64 GiB (was 128 GiB). While at it drop the PTE_TYPE_FAULT from __swp_entry_to_pte() which is defined to be 0 and is rather confusing because we should be dealing with "Linux PTEs" not "hardware PTEs". Also, properly mask the type in __swp_entry(). Cc: Russell King Signed-off-by: David Hildenbrand Reviewed-by: Russell King (Oracle) Reported-by: Mark Brown Signed-off-by: David Hildenbrand Tested-by: Mark Brown --- arch/arm/include/asm/pgtable-2level.h | 3 +++ arch/arm/include/asm/pgtable-3level.h | 3 +++ arch/arm/include/asm/pgtable.h | 35 +++++++++++++++++++++------ 3 files changed, 34 insertions(+), 7 deletions(-) diff --git a/arch/arm/include/asm/pgtable-2level.h b/arch/arm/include/asm/pgtable-2level.h index 92abd4cd8ca2..ce543cd9380c 100644 --- a/arch/arm/include/asm/pgtable-2level.h +++ b/arch/arm/include/asm/pgtable-2level.h @@ -126,6 +126,9 @@ #define L_PTE_SHARED (_AT(pteval_t, 1) << 10) /* shared(v6), coherent(xsc3) */ #define L_PTE_NONE (_AT(pteval_t, 1) << 11) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define L_PTE_SWP_EXCLUSIVE L_PTE_RDONLY + /* * These are the memory types, defined to be compatible with * pre-ARMv6 CPUs cacheable and bufferable bits: n/a,n/a,C,B diff --git a/arch/arm/include/asm/pgtable-3level.h b/arch/arm/include/asm/pgtable-3level.h index eabe72ff7381..106049791500 100644 --- a/arch/arm/include/asm/pgtable-3level.h +++ b/arch/arm/include/asm/pgtable-3level.h @@ -76,6 +76,9 @@ #define L_PTE_NONE (_AT(pteval_t, 1) << 57) /* PROT_NONE */ #define L_PTE_RDONLY (_AT(pteval_t, 1) << 58) /* READ ONLY */ +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define L_PTE_SWP_EXCLUSIVE (_AT(pteval_t, 1) << 7) + #define L_PMD_SECT_VALID (_AT(pmdval_t, 1) << 0) #define L_PMD_SECT_DIRTY (_AT(pmdval_t, 1) << 55) #define L_PMD_SECT_NONE (_AT(pmdval_t, 1) << 57) diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index f049072b2e85..886c275995a2 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -271,27 +271,48 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) } /* - * Encode and decode a swap entry. Swap entries are stored in the Linux - * page tables as follows: + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: * * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 - * <--------------- offset ------------------------> < type -> 0 0 + * <------------------- offset ------------------> E < type -> 0 0 + * + * E is the exclusive marker that is not stored in swap entries. * - * This gives us up to 31 swap files and 128GB per swap file. Note that + * This gives us up to 31 swap files and 64GB per swap file. Note that * the offset field is always non-zero. */ #define __SWP_TYPE_SHIFT 2 #define __SWP_TYPE_BITS 5 #define __SWP_TYPE_MASK ((1 << __SWP_TYPE_BITS) - 1) -#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) +#define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT + 1) #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & __SWP_TYPE_BITS) << __SWP_TYPE_SHIFT) | \ + ((offset) << __SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) -#define __swp_entry_to_pte(swp) __pte((swp).val | PTE_TYPE_FAULT) +#define __swp_entry_to_pte(swp) __pte((swp).val) + +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_isset(pte, L_PTE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return set_pte_bit(pte, __pgprot(L_PTE_SWP_EXCLUSIVE)); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return clear_pte_bit(pte, __pgprot(L_PTE_SWP_EXCLUSIVE)); +} /* * It is an error for the kernel to have more swap files than we can From patchwork Fri Jan 13 17:10:05 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43447 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp386942wrt; Fri, 13 Jan 2023 09:15:12 -0800 (PST) X-Google-Smtp-Source: AMrXdXt0LIYoFXGvyF/dYEFSuETdaogXmZWVJkAjN9N71Wt7FjuAVv2QommwslG1+1YdoiWSVOtV X-Received: by 2002:a05:6402:1f89:b0:47b:16c7:492c with SMTP id c9-20020a0564021f8900b0047b16c7492cmr78439097edc.25.1673630112781; Fri, 13 Jan 2023 09:15:12 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630112; cv=none; d=google.com; s=arc-20160816; b=FSqdR8Gz7qvq9Afr3TgpL4JKb8amIe0G8Akt6l9K7569WQVAYenFJvvZK23OcqofcD fKx8yJTx/iXsw3YeHg6L8OMa1tOCimTtrqPntpHRJhZr4/X9QL0bXuzyE7Ou0imyEORa ZbXBBZWvc5ryx0zA1O1iu2CxZV7KmRJrtBuEgrYC2QQtJTRCykXuUu4y9MQtBlLu4sLn /epx3Fxr67NRP0iZvyAgzqxFs8t81cyk0CawERMNBsBBtpXPsq0NrMdcSfK2pPxHvDud u4tIXiHiVK72W3DFzu6G+9Bcz8UhuKua5MjmbUZ/8ORYLGEL0JumtyTntjXOt0MTRhDj a7pg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=73fMLbo4V7+MiQ5juN7uSvKw/YSpoFxaX5Pl91RBCXU=; b=j3BK8s4ngGp2PR2nBUxOfAySf7HKBnDrPdvlpjN5P2nF8AB6xFy2DTMtdfphjG+WCo j7EeVJ9NeFBYapAGJgI4m2moD/BoSVU8f29/g8n5OKnKSGkcXzP+41oWOmikvBr6pVwr CmaRZH4I+tdgEzT0DVDQkX/VPy+ls3gx1Qoh7LfHmkjee/tjZC80IQb0GP0OXk6nDdMt 7T7Om+spi6Gc3Oe/iDo/ZlXc+n5fThGkATe7ptXY22olnFZm1k9dJ3M7uI24M5NijV+8 zPWS+dL4u3JLciKEnJ/e7LW3+jySOj9BwUP/3xhP4PvxbU2MrUF0k4Wm5bHw2ODcrgKJ p2rQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="btYaf/5I"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id b21-20020a0564021f1500b0049c8f136388si2080829edb.237.2023.01.13.09.14.48; Fri, 13 Jan 2023 09:15:12 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="btYaf/5I"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229660AbjAMRNx (ORCPT + 99 others); Fri, 13 Jan 2023 12:13:53 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53222 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229568AbjAMRNY (ORCPT ); Fri, 13 Jan 2023 12:13:24 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 728CA88DDD for ; Fri, 13 Jan 2023 09:11:25 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629884; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=73fMLbo4V7+MiQ5juN7uSvKw/YSpoFxaX5Pl91RBCXU=; b=btYaf/5IyeK6sbh+fv4M0TfGoS1lGcxNvUBn/G6/altxGvwvYhsRvkrEs7uATMMRwO9mzQ kHSR/hVRZJC9ncvjfVjhCAQnq8nEcNhK9P9sxNxFjVQe9WQi0KtFgGWFxSYwr4efQG6VC7 Eb4M8ZzmVwoqC9zDJBlO3XIskrwEdis= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-673-aDHSxwP-Maa5xUp69hE7Ig-1; Fri, 13 Jan 2023 12:11:23 -0500 X-MC-Unique: aDHSxwP-Maa5xUp69hE7Ig-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 98E2A886464; Fri, 13 Jan 2023 17:11:21 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id C8ACB40C2064; Fri, 13 Jan 2023 17:11:14 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Guo Ren Subject: [PATCH mm-unstable v1 05/26] csky/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:05 +0100 Message-Id: <20230113171026.582290-6-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928368614077759?= X-GMAIL-MSGID: =?utf-8?q?1754928368614077759?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the offset. This reduces the maximum swap space per file to 16 GiB (was 32 GiB). We might actually be able to reuse one of the other software bits (_PAGE_READ / PAGE_WRITE) instead, because we only have to keep pte_present(), pte_none() and HW happy. For now, let's keep it simple because there might be something non-obvious. Cc: Guo Ren Signed-off-by: David Hildenbrand --- arch/csky/abiv1/inc/abi/pgtable-bits.h | 13 +++++++++---- arch/csky/abiv2/inc/abi/pgtable-bits.h | 19 ++++++++++++------- arch/csky/include/asm/pgtable.h | 18 ++++++++++++++++++ 3 files changed, 39 insertions(+), 11 deletions(-) diff --git a/arch/csky/abiv1/inc/abi/pgtable-bits.h b/arch/csky/abiv1/inc/abi/pgtable-bits.h index 752c8b3f9194..ae7a2f76dd42 100644 --- a/arch/csky/abiv1/inc/abi/pgtable-bits.h +++ b/arch/csky/abiv1/inc/abi/pgtable-bits.h @@ -10,6 +10,9 @@ #define _PAGE_ACCESSED (1<<3) #define _PAGE_MODIFIED (1<<4) +/* We borrow bit 9 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<9) + /* implemented in hardware */ #define _PAGE_GLOBAL (1<<6) #define _PAGE_VALID (1<<7) @@ -26,7 +29,8 @@ #define _PAGE_PROT_NONE _PAGE_READ /* - * Encode and decode a swap entry + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). * * Format of swap PTE: * bit 0: _PAGE_PRESENT (zero) @@ -35,15 +39,16 @@ * bit 6: _PAGE_GLOBAL (zero) * bit 7: _PAGE_VALID (zero) * bit 8: swap type[4] - * bit 9 - 31: swap offset + * bit 9: exclusive marker + * bit 10 - 31: swap offset */ #define __swp_type(x) ((((x).val >> 2) & 0xf) | \ (((x).val >> 4) & 0x10)) -#define __swp_offset(x) ((x).val >> 9) +#define __swp_offset(x) ((x).val >> 10) #define __swp_entry(type, offset) ((swp_entry_t) { \ ((type & 0xf) << 2) | \ ((type & 0x10) << 4) | \ - ((offset) << 9)}) + ((offset) << 10)}) #define HAVE_ARCH_UNMAPPED_AREA diff --git a/arch/csky/abiv2/inc/abi/pgtable-bits.h b/arch/csky/abiv2/inc/abi/pgtable-bits.h index 7e7f389f546f..526152bd2156 100644 --- a/arch/csky/abiv2/inc/abi/pgtable-bits.h +++ b/arch/csky/abiv2/inc/abi/pgtable-bits.h @@ -10,6 +10,9 @@ #define _PAGE_PRESENT (1<<10) #define _PAGE_MODIFIED (1<<11) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<7) + /* implemented in hardware */ #define _PAGE_GLOBAL (1<<0) #define _PAGE_VALID (1<<1) @@ -26,23 +29,25 @@ #define _PAGE_PROT_NONE _PAGE_WRITE /* - * Encode and decode a swap entry + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). * * Format of swap PTE: * bit 0: _PAGE_GLOBAL (zero) * bit 1: _PAGE_VALID (zero) * bit 2 - 6: swap type - * bit 7 - 8: swap offset[0 - 1] + * bit 7: exclusive marker + * bit 8: swap offset[0] * bit 9: _PAGE_WRITE (zero) * bit 10: _PAGE_PRESENT (zero) - * bit 11 - 31: swap offset[2 - 22] + * bit 11 - 31: swap offset[1 - 21] */ #define __swp_type(x) (((x).val >> 2) & 0x1f) -#define __swp_offset(x) ((((x).val >> 7) & 0x3) | \ - (((x).val >> 9) & 0x7ffffc)) +#define __swp_offset(x) ((((x).val >> 8) & 0x1) | \ + (((x).val >> 10) & 0x3ffffe)) #define __swp_entry(type, offset) ((swp_entry_t) { \ ((type & 0x1f) << 2) | \ - ((offset & 0x3) << 7) | \ - ((offset & 0x7ffffc) << 9)}) + ((offset & 0x1) << 8) | \ + ((offset & 0x3ffffe) << 10)}) #endif /* __ASM_CSKY_PGTABLE_BITS_H */ diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h index 77bc6caff2d2..574c97b9ecca 100644 --- a/arch/csky/include/asm/pgtable.h +++ b/arch/csky/include/asm/pgtable.h @@ -200,6 +200,24 @@ static inline pte_t pte_mkyoung(pte_t pte) return pte; } +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #define __HAVE_PHYS_MEM_ACCESS_PROT struct file; extern pgprot_t phys_mem_access_prot(struct file *file, unsigned long pfn, From patchwork Fri Jan 13 17:10:06 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43451 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387240wrt; Fri, 13 Jan 2023 09:15:44 -0800 (PST) X-Google-Smtp-Source: AMrXdXsmZBLbwfiaHq6M9mFnF6EaWfdNt7ozO3mUeum3di2YnCJFhDM/uKmTv1bRoEoeRrYkZAiG X-Received: by 2002:aa7:d419:0:b0:49d:57:f538 with SMTP id z25-20020aa7d419000000b0049d0057f538mr1461807edq.15.1673630144427; Fri, 13 Jan 2023 09:15:44 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630144; cv=none; d=google.com; s=arc-20160816; b=yawlfDCT3A5YTCabZHmWbC4ErPxEbMapIUD8otZ/eUTIe4LFBARvU4J83mNC1ysFZO /sRMR3Y6IwcC24L4hNp/baz93P/e465nMYx+0Uwa9WMbCjvXnaZ5IgVRxIsf+4jwU/8C cQa4EvNSspYebkkkRMpRjhJB5kR9tJ1c1EFsYL2zZFyTmnU2fqve5oq7BBoghNevERrR rCqouZRAWuBtex3bTYaGZILvCt4L2NH3yBFBudGd8tCvck+oQurKawbfZLdipCa67tmh akZJg1wddFLb3wqAEW3tTUZTRCT69JoIjeGf/5wyiFkE8e2YUEti8AZvRuILQJ3RneMf 6i7w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=7Tra/8OvEB/D6RZgFaJhZ/NUp8ml8r1Zefl0IpfbRbo=; b=VP+RQdCO4xVTsSPnAz83Dz0CiYB46zzWTfrqQw9XyI2cw1aeFPTubLc52ZACnJtwYk g1RWVQzOypAXf6jF7dC+CHp52kBW0Lc9jsKWxXvg3TiIyAhsVPTF1Kx/D9c9fWyOeeTc 99nqo1yocHgsDnx2WWRso+/2fyTQXmcu5bkGYRH2eSfaaGzEBr/tp3W7LZxmCfBlruec A4L8d6BdC7I7wzJs46u2dw48C2JNCmd8RaLQv6oEx7JnUraN2LWbX+A+Z3I2rNS99n9l EWZZKH7+oanFJEr02hADff0DtT6vL1JotSyw0JdPKEfZ9CPaJCC0kDh7SrC/NdOa+5GC OEtA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=R0KXRaYn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id h11-20020a05640250cb00b0049bdedc5198si4078469edb.183.2023.01.13.09.15.15; Fri, 13 Jan 2023 09:15:44 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=R0KXRaYn; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229558AbjAMROK (ORCPT + 99 others); Fri, 13 Jan 2023 12:14:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53102 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229626AbjAMRNl (ORCPT ); Fri, 13 Jan 2023 12:13:41 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 34FA088DF4 for ; Fri, 13 Jan 2023 09:11:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629895; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=7Tra/8OvEB/D6RZgFaJhZ/NUp8ml8r1Zefl0IpfbRbo=; b=R0KXRaYnRHsv70keuzy9GJHA5psuRWQYwOLvaA0+5s1cVfuEG5SL+lXFm82ckkh9BWcn47 2PR+QLF7HmivRTI/wKl4cSJpjjhl/Qr2F1ptvUuzcwpkqyOCHUKGpp8loI2e3QJF00tOZL f5xWjjhdqonLe+qQbveyy1ZFnjyhsUo= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-655-XLgqcdLfMlOTpMhM2wlwUA-1; Fri, 13 Jan 2023 12:11:29 -0500 X-MC-Unique: XLgqcdLfMlOTpMhM2wlwUA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id BD677281DE79; Fri, 13 Jan 2023 17:11:27 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 1DDA340C2064; Fri, 13 Jan 2023 17:11:21 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Brian Cain Subject: [PATCH mm-unstable v1 06/26] hexagon/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:06 +0100 Message-Id: <20230113171026.582290-7-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928402292118144?= X-GMAIL-MSGID: =?utf-8?q?1754928402292118144?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the offset. This reduces the maximum swap space per file to 16 GiB (was 32 GiB). While at it, mask the type in __swp_entry(). Cc: Brian Cain Signed-off-by: David Hildenbrand --- arch/hexagon/include/asm/pgtable.h | 37 +++++++++++++++++++++++++----- 1 file changed, 31 insertions(+), 6 deletions(-) diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h index f7048c18b6f9..7eb008e477c8 100644 --- a/arch/hexagon/include/asm/pgtable.h +++ b/arch/hexagon/include/asm/pgtable.h @@ -61,6 +61,9 @@ extern unsigned long empty_zero_page; * So we'll put up with a bit of inefficiency for now... */ +/* We borrow bit 6 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<6) + /* * Top "FOURTH" level (pgd), which for the Hexagon VM is really * only the second from the bottom, pgd and pud both being collapsed. @@ -359,9 +362,12 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #define ZERO_PAGE(vaddr) (virt_to_page(&empty_zero_page)) /* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * * Swap/file PTE definitions. If _PAGE_PRESENT is zero, the rest of the PTE is * interpreted as swap information. The remaining free bits are interpreted as - * swap type/offset tuple. Rather than have the TLB fill handler test + * listed below. Rather than have the TLB fill handler test * _PAGE_PRESENT, we're going to reserve the permissions bits and set them to * all zeros for swap entries, which speeds up the miss handler at the cost of * 3 bits of offset. That trade-off can be revisited if necessary, but Hexagon @@ -371,9 +377,10 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) * Format of swap PTE: * bit 0: Present (zero) * bits 1-5: swap type (arch independent layer uses 5 bits max) - * bits 6-9: bits 3:0 of offset + * bit 6: exclusive marker + * bits 7-9: bits 2:0 of offset * bits 10-12: effectively _PAGE_PROTNONE (all zero) - * bits 13-31: bits 22:4 of swap offset + * bits 13-31: bits 21:3 of swap offset * * The split offset makes some of the following macros a little gnarly, * but there's plenty of precedent for this sort of thing. @@ -383,11 +390,29 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #define __swp_type(swp_pte) (((swp_pte).val >> 1) & 0x1f) #define __swp_offset(swp_pte) \ - ((((swp_pte).val >> 6) & 0xf) | (((swp_pte).val >> 9) & 0x7ffff0)) + ((((swp_pte).val >> 7) & 0x7) | (((swp_pte).val >> 10) & 0x3ffff8)) #define __swp_entry(type, offset) \ ((swp_entry_t) { \ - ((type << 1) | \ - ((offset & 0x7ffff0) << 9) | ((offset & 0xf) << 6)) }) + (((type & 0x1f) << 1) | \ + ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) }) + +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} #endif From patchwork Fri Jan 13 17:10:07 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43449 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387078wrt; Fri, 13 Jan 2023 09:15:27 -0800 (PST) X-Google-Smtp-Source: AMrXdXsJ0moWbCvLKkUaaK8grvo5mrqdYs57ZCEXxtv2G1gS2l5Pi18mShlc66jH9MK2+3M+vgh4 X-Received: by 2002:aa7:d44b:0:b0:49c:3cf4:d9ed with SMTP id q11-20020aa7d44b000000b0049c3cf4d9edmr2820341edr.23.1673630127091; Fri, 13 Jan 2023 09:15:27 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630127; cv=none; d=google.com; s=arc-20160816; b=hl9iNsVkps35F1Ay5E7a/g8svAWYuLYOInZxANbWPlNTFqbNudShMULcBxp73J8JjV 3eD3sX5G8uiyQpgD97UF68EEPmNTn6sEt4OH1RgVdX1lUGhoSXADALsBMw3+r66HM7EW usG0pzE37ZvIijnvQVr1Aazh3lif4DmKzBsVe0iCdKLUohH+Y567I8/MXm0TlSu4sOaL 5KsSybWQ4wSECI7tVdgyq2t+ewvH0zlHpIg4zoJV1792EoxPKKqaAUVuP6FduQeVPF1x Yl28Karc8sAMd52j5oYyIJp2+dGbNcEVtn3rB1Ywbec9pOq9ML49+b4vReIiIkyJFC50 zEkw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=aoWiVle2vALbm81f87GqQxp1lNDAFbpV4WpvPll4VZk=; b=Ms+sztEzDsvmaH6ryPG+kVE2VbWDvoo74FYKsMjx01du1D589QiR7K/LMQdeFeQuPm ls1hl5xgrEHX3dvukml8URZgN5t4pJAxXfDgmDLfMj1OvFfymCLzPHm6kDJ7yOPLYI1i efTEk4kPYZlsoerdBpB+oDEzRP0dmad8yK7qIOGc/5AHwpncyfg3pjr9BZQzDX2Nxdwu 7gxWd6xvGjF+REERzjialMiSrQNvMvyVmH6JvHdk2pi5k1s7+otqkH6PsynMS3WJhKag hf12Ik3HyXrrvqfd2K8lcyj+aT2kEZXTevakegL4yYRB9A2miGlBK025KrZ0MWBPPi56 ojlg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=SLrWrxVm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id f12-20020a056402194c00b00499b50657d6si14651146edz.531.2023.01.13.09.15.03; Fri, 13 Jan 2023 09:15:27 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=SLrWrxVm; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229883AbjAMROG (ORCPT + 99 others); Fri, 13 Jan 2023 12:14:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54662 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbjAMRNm (ORCPT ); Fri, 13 Jan 2023 12:13:42 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E35603D1D9 for ; Fri, 13 Jan 2023 09:11:39 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629899; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=aoWiVle2vALbm81f87GqQxp1lNDAFbpV4WpvPll4VZk=; b=SLrWrxVmP5LVjot99SUR3ProFdEdpmF1Oc4XSTuyR63CyayNN3622+6gXh/tKYDJE2cI8b ydgGD8A4xhvef1xmXNJdPFD/NnG9+VixclpwIjk/siO2D0eoAxvvxgj0SjQ1tqYU1sbMlK HJqoq0aCEd59cD4TnhNbaYbqdIFfCGE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-527-rdVTI0nvPQSRFri4XAJDbA-1; Fri, 13 Jan 2023 12:11:36 -0500 X-MC-Unique: rdVTI0nvPQSRFri4XAJDbA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 82DD1101B42B; Fri, 13 Jan 2023 17:11:34 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 4259640C2064; Fri, 13 Jan 2023 17:11:27 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand Subject: [PATCH mm-unstable v1 07/26] ia64/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:07 +0100 Message-Id: <20230113171026.582290-8-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928383816898162?= X-GMAIL-MSGID: =?utf-8?q?1754928383816898162?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. While at it, also mask the type in __swp_entry(). Signed-off-by: David Hildenbrand --- arch/ia64/include/asm/pgtable.h | 32 +++++++++++++++++++++++++++++--- 1 file changed, 29 insertions(+), 3 deletions(-) diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h index 01517a5e6778..e4b8ab931399 100644 --- a/arch/ia64/include/asm/pgtable.h +++ b/arch/ia64/include/asm/pgtable.h @@ -58,6 +58,9 @@ #define _PAGE_ED (__IA64_UL(1) << 52) /* exception deferral */ #define _PAGE_PROTNONE (__IA64_UL(1) << 63) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1 << 7) + #define _PFN_MASK _PAGE_PPN_MASK /* Mask of bits which may be changed by pte_modify(); the odd bits are there for _PAGE_PROTNONE */ #define _PAGE_CHG_MASK (_PAGE_P | _PAGE_PROTNONE | _PAGE_PL_MASK | _PAGE_AR_MASK | _PAGE_ED) @@ -399,6 +402,9 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern void paging_init (void); /* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * * Note: The macros below rely on the fact that MAX_SWAPFILES_SHIFT <= number of * bits in the swap-type field of the swap pte. It would be nice to * enforce that, but we can't easily include here. @@ -406,16 +412,36 @@ extern void paging_init (void); * * Format of swap pte: * bit 0 : present bit (must be zero) - * bits 1- 7: swap-type + * bits 1- 6: swap type + * bit 7 : exclusive marker * bits 8-62: swap offset * bit 63 : _PAGE_PROTNONE bit */ -#define __swp_type(entry) (((entry).val >> 1) & 0x7f) +#define __swp_type(entry) (((entry).val >> 1) & 0x3f) #define __swp_offset(entry) (((entry).val << 1) >> 9) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 1) | ((long) (offset) << 8) }) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type & 0x3f) << 1) | \ + ((long) (offset) << 8) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id cx26-20020a05640222ba00b0048c7e8f3dcasi19622265edb.483.2023.01.13.09.15.21; Fri, 13 Jan 2023 09:16:15 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=dDr5i9km; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230245AbjAMRPK (ORCPT + 99 others); Fri, 13 Jan 2023 12:15:10 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230020AbjAMROQ (ORCPT ); Fri, 13 Jan 2023 12:14:16 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 355A089BF3 for ; Fri, 13 Jan 2023 09:11:49 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629908; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=VrUB2NRjghlzVoNQHKteBTC+XVSGThz3GjMZ7z8Kku8=; b=dDr5i9km9ADLZqhrvDXqJl8MFl2xUYfd3V+oGOQZkdhRqulwthWDLQb2TqpITDj0/JE+nK JWkQIIGHyEA0+IwcUfAE6T0bk5F6hGr/VfMfP/lj1noGUu/GenPOL+kporfSnSRvCzZtiO C4ub9AW9oXF4qx5LLt18f9ILfjNbPQU= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-458-LLf--PisOGC08DN12Vq3Xg-1; Fri, 13 Jan 2023 12:11:43 -0500 X-MC-Unique: LLf--PisOGC08DN12Vq3Xg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 19FA9886462; Fri, 13 Jan 2023 17:11:42 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 24A5940C2064; Fri, 13 Jan 2023 17:11:34 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Huacai Chen , WANG Xuerui Subject: [PATCH mm-unstable v1 08/26] loongarch/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:08 +0100 Message-Id: <20230113171026.582290-9-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928434350557027?= X-GMAIL-MSGID: =?utf-8?q?1754928434350557027?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. While at it, also mask the type in mk_swap_pte(). Note that this bit does not conflict with swap PMDs and could also be used in swap PMD context later. Cc: Huacai Chen Cc: WANG Xuerui Signed-off-by: David Hildenbrand --- arch/loongarch/include/asm/pgtable-bits.h | 4 +++ arch/loongarch/include/asm/pgtable.h | 39 ++++++++++++++++++++--- 2 files changed, 39 insertions(+), 4 deletions(-) diff --git a/arch/loongarch/include/asm/pgtable-bits.h b/arch/loongarch/include/asm/pgtable-bits.h index 3d1e0a69975a..8b98d22a145b 100644 --- a/arch/loongarch/include/asm/pgtable-bits.h +++ b/arch/loongarch/include/asm/pgtable-bits.h @@ -20,6 +20,7 @@ #define _PAGE_SPECIAL_SHIFT 11 #define _PAGE_HGLOBAL_SHIFT 12 /* HGlobal is a PMD bit */ #define _PAGE_PFN_SHIFT 12 +#define _PAGE_SWP_EXCLUSIVE_SHIFT 23 #define _PAGE_PFN_END_SHIFT 48 #define _PAGE_NO_READ_SHIFT 61 #define _PAGE_NO_EXEC_SHIFT 62 @@ -33,6 +34,9 @@ #define _PAGE_PROTNONE (_ULCAST_(1) << _PAGE_PROTNONE_SHIFT) #define _PAGE_SPECIAL (_ULCAST_(1) << _PAGE_SPECIAL_SHIFT) +/* We borrow bit 23 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (_ULCAST_(1) << _PAGE_SWP_EXCLUSIVE_SHIFT) + /* Used by TLB hardware (placed in EntryLo*) */ #define _PAGE_VALID (_ULCAST_(1) << _PAGE_VALID_SHIFT) #define _PAGE_DIRTY (_ULCAST_(1) << _PAGE_DIRTY_SHIFT) diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index 7a34e900d8c1..c6b8fe7ac43c 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -249,13 +249,26 @@ extern void pud_init(void *addr); extern void pmd_init(void *addr); /* - * Non-present pages: high 40 bits are offset, next 8 bits type, - * low 16 bits zero. + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <--------------------------- offset --------------------------- + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * --------------> E <--- type ---> <---------- zeroes ----------> + * + * E is the exclusive marker that is not stored in swap entries. + * The zero'ed bits include _PAGE_PRESENT and _PAGE_PROTNONE. */ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) -{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } +{ pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; } -#define __swp_type(x) (((x).val >> 16) & 0xff) +#define __swp_type(x) (((x).val >> 16) & 0x7f) #define __swp_offset(x) ((x).val >> 24) #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) @@ -263,6 +276,24 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + extern void paging_init(void); #define pte_none(pte) (!(pte_val(pte) & ~_PAGE_GLOBAL)) From patchwork Fri Jan 13 17:10:09 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43450 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387238wrt; Fri, 13 Jan 2023 09:15:44 -0800 (PST) X-Google-Smtp-Source: AMrXdXsr2HoegTKzdcQvEcp9yoO5gVpnY3dgABCc1nx93pR1H0StZ/AS0fwJN1VyMGNsLyEvGew5 X-Received: by 2002:a05:6402:f85:b0:49d:221b:4b3f with SMTP id eh5-20020a0564020f8500b0049d221b4b3fmr404021edb.21.1673630144389; Fri, 13 Jan 2023 09:15:44 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630144; cv=none; d=google.com; s=arc-20160816; b=Zxw2u4LuX5gltqr0+TFaF768TwOQTmtEtBx8XV6PVkrOlI0eB0F6DPnMgJVbApt6WU yFuYjMVQ0OEt5Zc71CoLmU8i7uCmDHd8540LZP0iYkQhBWAP6ZnVhwyFG3/gVF1YOvrG iqWi5R0YfK5zNv5shORZHupLqE1g3GmvPi9JaAL2rDpMoHHJHOLzNwWX0UAbkSdK0oxk c0Oj2q3qiIx2XV4tP03s584w/9sM/NcamyDWswHAEEGD8YogAlJA6fmoKz+Q9rSJBdlY NZnBexnio/6PEH3bOTHeMeRLbHa7MATNkQf7KrxkjUjBS8X0YX+Ns/AMwzl8PCTYF4N7 M+cg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=PrJuijetzKzX9KpzIdAxk/Koal6C2qJYp3mLQ4v5lnk=; b=sjOA4rXsmZYUSlsExQ4WGE8iqjok1MJQDEQBvsBrjiKlF7ZzmAAPlgMunY20uosOLE Nqn1nVRbXHsEVoLQS7rHQp/xEkUKslenwXOUmnXfJa8ryxg9UlCUAzJ6f4mnSDJHjope kEaGM+4+21rn+PKK2JKU5KhuwdwQalbBoxZLpg5D7YwJAI7ajQSxhzwouYX4jqL8lzCy ts+gpkmlZJS3pWt6bY0ozhdbn5CFCJt09nCaFaDtwhZI9KnGAeuiBSP5Ep5MCAXosfGw fJt/W/3s9ZgegUx4by+f5TAZjxH1NkdcFBZoXfykreuYCwDkQuE6C8h7uCo0EDQWR72+ BcLg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Goioif5M; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id q20-20020a056402519400b004854e1d2682si25691327edd.249.2023.01.13.09.15.15; Fri, 13 Jan 2023 09:15:44 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Goioif5M; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230218AbjAMRPG (ORCPT + 99 others); Fri, 13 Jan 2023 12:15:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229894AbjAMRON (ORCPT ); Fri, 13 Jan 2023 12:14:13 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C5A408B50B for ; Fri, 13 Jan 2023 09:11:56 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629916; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=PrJuijetzKzX9KpzIdAxk/Koal6C2qJYp3mLQ4v5lnk=; b=Goioif5MC4/v94WD0YpFrVlY19XvP4eNdcMj77K3jBw5ZPKHZ2gBIcVJ2oWC7WSJPmlx4c IUOu3ENEtOSMSyjHsSw54JLCojyqGBF5GIr40Bon69paA/1Rlbn9HyCcOQ38v9n97OCkO4 GfXqd43khAhNH5+g72OrwPI1hLrP3Ic= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-634-fV_i2j1xMOCJnkfjQ_cdLg-1; Fri, 13 Jan 2023 12:11:51 -0500 X-MC-Unique: fV_i2j1xMOCJnkfjQ_cdLg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 6276D1869B60; Fri, 13 Jan 2023 17:11:50 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7AB6A40C2064; Fri, 13 Jan 2023 17:11:42 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Geert Uytterhoeven , Greg Ungerer Subject: [PATCH mm-unstable v1 09/26] m68k/mm: remove dummy __swp definitions for nommu Date: Fri, 13 Jan 2023 18:10:09 +0100 Message-Id: <20230113171026.582290-10-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928402262399959?= X-GMAIL-MSGID: =?utf-8?q?1754928402262399959?= The definitions are not required, let's remove them. Cc: Geert Uytterhoeven Cc: Greg Ungerer Signed-off-by: David Hildenbrand --- arch/m68k/include/asm/pgtable_no.h | 6 ------ 1 file changed, 6 deletions(-) diff --git a/arch/m68k/include/asm/pgtable_no.h b/arch/m68k/include/asm/pgtable_no.h index fed58da3a6b6..fc044df52b96 100644 --- a/arch/m68k/include/asm/pgtable_no.h +++ b/arch/m68k/include/asm/pgtable_no.h @@ -31,12 +31,6 @@ extern void paging_init(void); #define swapper_pg_dir ((pgd_t *) 0) -#define __swp_type(x) (0) -#define __swp_offset(x) (0) -#define __swp_entry(typ,off) ((swp_entry_t) { ((typ) | ((off) << 7)) }) -#define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) -#define __swp_entry_to_pte(x) ((pte_t) { (x).val }) - /* * ZERO_PAGE is a global shared page that is always zero: used * for zero-mapped memory areas etc.. 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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ht19-20020a170907609300b007c0f2185e37si23480112ejc.868.2023.01.13.09.15.38; Fri, 13 Jan 2023 09:16:02 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="b/esKd5A"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229964AbjAMRPX (ORCPT + 99 others); Fri, 13 Jan 2023 12:15:23 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55554 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229958AbjAMROV (ORCPT ); Fri, 13 Jan 2023 12:14:21 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7609E8B51A for ; Fri, 13 Jan 2023 09:12:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629921; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=71H0EiI9XZaUsVwjuHgiK9LM9EkskPiPxouUqNauT5k=; b=b/esKd5AmvVHKpJYLbZ44BQh5CejRgwebjbAUz0zqo2Ur+Zu2f0YUvr+TzWE/8vx1zntk8 lZHQzmas/mO1qjpoeI6yDCZ0JKwsdSn05eWIZsSvl5d6pAuo/ku0S8f2tOTdbEtusQCFT3 mr9R+yKNOmqIzk4CmY3haYwzDbRoMSI= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-435-3ii295eDPOiphYm8W5OixA-1; Fri, 13 Jan 2023 12:11:58 -0500 X-MC-Unique: 3ii295eDPOiphYm8W5OixA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E0BF8811E6E; Fri, 13 Jan 2023 17:11:56 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id C84D040C2064; Fri, 13 Jan 2023 17:11:50 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Geert Uytterhoeven , Greg Ungerer Subject: [PATCH mm-unstable v1 10/26] m68k/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:10 +0100 Message-Id: <20230113171026.582290-11-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928420816076599?= X-GMAIL-MSGID: =?utf-8?q?1754928420816076599?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. While at it, make sure for sun3 that the valid bit never gets set by properly masking it off and mask the type in __swp_entry(). Cc: Geert Uytterhoeven Cc: Greg Ungerer Signed-off-by: David Hildenbrand --- arch/m68k/include/asm/mcf_pgtable.h | 36 ++++++++++++++++++++-- arch/m68k/include/asm/motorola_pgtable.h | 38 +++++++++++++++++++++-- arch/m68k/include/asm/sun3_pgtable.h | 39 ++++++++++++++++++++++-- 3 files changed, 104 insertions(+), 9 deletions(-) diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h index b619b22823f8..3f8f4d0e66dd 100644 --- a/arch/m68k/include/asm/mcf_pgtable.h +++ b/arch/m68k/include/asm/mcf_pgtable.h @@ -46,6 +46,9 @@ #define _CACHEMASK040 (~0x060) #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x080 + /* * Externally used page protection values. */ @@ -254,15 +257,42 @@ static inline pte_t pte_mkcache(pte_t pte) extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; /* - * Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <------------------ offset -------------> 0 0 0 E <-- type ---> + * + * E is the exclusive marker that is not stored in swap entries. */ -#define __swp_type(x) ((x).val & 0xFF) +#define __swp_type(x) ((x).val & 0x7f) #define __swp_offset(x) ((x).val >> 11) -#define __swp_entry(typ, off) ((swp_entry_t) { (typ) | \ +#define __swp_entry(typ, off) ((swp_entry_t) { ((typ) & 0x7f) | \ (off << 11) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) (__pte((x).val)) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #define pmd_pfn(pmd) (pmd_val(pmd) >> PAGE_SHIFT) #define pmd_page(pmd) (pfn_to_page(pmd_val(pmd) >> PAGE_SHIFT)) diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h index 562b54e09850..c1782563e793 100644 --- a/arch/m68k/include/asm/motorola_pgtable.h +++ b/arch/m68k/include/asm/motorola_pgtable.h @@ -41,6 +41,9 @@ #define _PAGE_PROTNONE 0x004 +/* We borrow bit 11 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x800 + #ifndef __ASSEMBLY__ /* This is the cache mode to be used for pages containing page descriptors for @@ -169,12 +172,41 @@ static inline pte_t pte_mkcache(pte_t pte) #define swapper_pg_dir kernel_pg_dir extern pgd_t kernel_pg_dir[128]; -/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ -#define __swp_type(x) (((x).val >> 4) & 0xff) +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <----------------- offset ------------> E <-- type ---> 0 0 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + */ +#define __swp_type(x) (((x).val >> 4) & 0x7f) #define __swp_offset(x) ((x).val >> 12) -#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 12) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x7f) << 4) | ((offset) << 12) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #endif /* !__ASSEMBLY__ */ #endif /* _MOTOROLA_PGTABLE_H */ diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h index 90d57e537eb1..dbfc9703b15d 100644 --- a/arch/m68k/include/asm/sun3_pgtable.h +++ b/arch/m68k/include/asm/sun3_pgtable.h @@ -71,6 +71,9 @@ #define SUN3_PMD_MASK (0x0000003F) #define SUN3_PMD_MAGIC (0x0000002B) +/* We borrow bit 6 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x040 + #ifndef __ASSEMBLY__ /* @@ -152,12 +155,42 @@ static inline pte_t pte_mkcache(pte_t pte) { return pte; } extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; -/* Macros to (de)construct the fake PTEs representing swap pages. */ -#define __swp_type(x) ((x).val & 0x7F) +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * 0 <--------------------- offset ----------------> E <- type --> + * + * E is the exclusive marker that is not stored in swap entries. + */ +#define __swp_type(x) ((x).val & 0x3f) #define __swp_offset(x) (((x).val) >> 7) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) | ((offset) << 7)) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x3f) | \ + (((offset) << 7) & ~SUN3_PAGE_VALID)) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #endif /* !__ASSEMBLY__ */ #endif /* !_SUN3_PGTABLE_H */ From patchwork Fri Jan 13 17:10:11 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43454 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387748wrt; Fri, 13 Jan 2023 09:16:43 -0800 (PST) X-Google-Smtp-Source: AMrXdXuxQX+udlcNcY+juZtBAfAk/zS4o16ZLJpj5HGhBVAhDrlCEqf3hzkNZx2NBpbxk4l6CRgT X-Received: by 2002:a17:906:fad8:b0:84d:141f:6784 with SMTP id lu24-20020a170906fad800b0084d141f6784mr4027089ejb.29.1673630203460; Fri, 13 Jan 2023 09:16:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630203; cv=none; d=google.com; s=arc-20160816; b=J66ZzEzworQXWmRc7hwKchzzJuldIhdbkSOW8Cva1Fd9nbesvGIdjqA+lThfaHym7w eYRlVYhA0rDDdbDwtjlbkdLkXf5E7fYI/GPcWEI9R8jtZf44pvLpVOJjDWYEQ+ROjtQz Vwzgoaf3RJu2BL5IqE30/i66oS6PeH2W6B7ODqMjy2g/WipdbJAoCwkEqsOTWs0GX619 TgAm0DAW48zhrDW9hdAbB40mezZyFb4uXhOTQ00eBRrYYPbtm0RsczdlhCu31PN5qJfA zxnfgMENE8xIh+Jk2FUzjUl0hONcnMh4uVkvcfceAPoOClHvaAvfl1Oxqm9cxySxnFX5 Uf3w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=JZcX00ju5P8l3bWcjlRMVivYXDItx4CmRVLUsqu0Ie0=; b=xqip0gbpypF8/XdSly0ffZ9C2ItUP1dYGklRoU891BgPW0cVA1BdGlDU5+wGSh13NL mqhLNRzNJHRTmKxj3KKxLeeamq/8QnSaXNR4S1UHX9Yl6YDMdPa1auZvavzgPT56P0Rb e4gMX393/nUkWQh1DzW/bdrdb7fztJUkLuFmdHP5SCpLZlFNS0M0Cp+zWSwJU6suzq4K PhQv0Xo26gPUhHkPTc9XVh15C+DOUS0JhNjTQYEkycvvsP5j1Nh3LXcZ6xGfB54S7zS0 Xy1Y2awvZrQwNKIvmWnvND49K5sSHA105wMVLkGpMJX3UGgqzX4ULu3YbdWTN1rKR6V/ twMw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="ad/I8NNb"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id dr11-20020a170907720b00b007c0d95413bfsi21795128ejc.665.2023.01.13.09.16.18; Fri, 13 Jan 2023 09:16:43 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="ad/I8NNb"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230331AbjAMRQG (ORCPT + 99 others); Fri, 13 Jan 2023 12:16:06 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53218 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230126AbjAMROi (ORCPT ); Fri, 13 Jan 2023 12:14:38 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 806888B53E for ; Fri, 13 Jan 2023 09:12:08 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629927; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=JZcX00ju5P8l3bWcjlRMVivYXDItx4CmRVLUsqu0Ie0=; b=ad/I8NNbK0BFo5s8yK84eAjbgpccx9OG5VwQuD9nP1WojMrg7zJ5gwQedl/+k4Hvnh+MjB XTiEx1D++kcsnflN7TAcAJj2MA38VDduWSJhCjcdPmAakOGmTWqZla05JEV7mpQLs2IbbR Ieg5GzPRGfpByY8LWQYJq1Ab85epPdE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-152-MOn-UZp5N6mZ9vltJ9F7HA-1; Fri, 13 Jan 2023 12:12:04 -0500 X-MC-Unique: MOn-UZp5N6mZ9vltJ9F7HA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 12B33886463; Fri, 13 Jan 2023 17:12:03 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 56A1E40C2064; Fri, 13 Jan 2023 17:11:57 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Michal Simek Subject: [PATCH mm-unstable v1 11/26] microblaze/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:11 +0100 Message-Id: <20230113171026.582290-12-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928464489396392?= X-GMAIL-MSGID: =?utf-8?q?1754928464489396392?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. The shift by 2 when converting between PTE and arch-specific swap entry makes the swap PTE layout a little bit harder to decipher. While at it, drop the comment from paulus---copy-and-paste leftover from powerpc where we actually have _PAGE_HASHPTE---and mask the type in __swp_entry_to_pte() as well. Cc: Michal Simek Signed-off-by: David Hildenbrand --- arch/m68k/include/asm/mcf_pgtable.h | 4 +-- arch/microblaze/include/asm/pgtable.h | 45 +++++++++++++++++++++------ 2 files changed, 37 insertions(+), 12 deletions(-) diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h index 3f8f4d0e66dd..e573d7b649f7 100644 --- a/arch/m68k/include/asm/mcf_pgtable.h +++ b/arch/m68k/include/asm/mcf_pgtable.h @@ -46,8 +46,8 @@ #define _CACHEMASK040 (~0x060) #define _PAGE_GLOBAL040 0x400 /* 68040 global bit, used for kva descs */ -/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ -#define _PAGE_SWP_EXCLUSIVE 0x080 +/* We borrow bit 24 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE CF_PAGE_NOCACHE /* * Externally used page protection values. diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h index 42f5988e998b..7e3de54bf426 100644 --- a/arch/microblaze/include/asm/pgtable.h +++ b/arch/microblaze/include/asm/pgtable.h @@ -131,10 +131,10 @@ extern pte_t *va_to_pte(unsigned long address); * of the 16 available. Bit 24-26 of the TLB are cleared in the TLB * miss handler. Bit 27 is PAGE_USER, thus selecting the correct * zone. - * - PRESENT *must* be in the bottom two bits because swap cache - * entries use the top 30 bits. Because 4xx doesn't support SMP - * anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30 - * is cleared in the TLB miss handler before the TLB entry is loaded. + * - PRESENT *must* be in the bottom two bits because swap PTEs use the top + * 30 bits. Because 4xx doesn't support SMP anyway, M is irrelevant so we + * borrow it for PAGE_PRESENT. Bit 30 is cleared in the TLB miss handler + * before the TLB entry is loaded. * - All other bits of the PTE are loaded into TLBLO without * * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for * software PTE bits. We actually use bits 21, 24, 25, and @@ -155,6 +155,9 @@ extern pte_t *va_to_pte(unsigned long address); #define _PAGE_ACCESSED 0x400 /* software: R: page referenced */ #define _PMD_PRESENT PAGE_MASK +/* We borrow bit 24 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_DIRTY + /* * Some bits are unused... */ @@ -393,18 +396,40 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; /* - * Encode and decode a swap entry. - * Note that the bits we use in a PTE for representing a swap entry - * must not include the _PAGE_PRESENT bit, or the _PAGE_HASHPTE bit - * (if used). -- paulus + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * <------------------ offset -------------------> E < type -> 0 0 + * + * E is the exclusive marker that is not stored in swap entries. */ -#define __swp_type(entry) ((entry).val & 0x3f) +#define __swp_type(entry) ((entry).val & 0x1f) #define __swp_offset(entry) ((entry).val >> 6) #define __swp_entry(type, offset) \ - ((swp_entry_t) { (type) | ((offset) << 6) }) + ((swp_entry_t) { ((type) & 0x1f) | ((offset) << 6) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 2 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 2 }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + extern unsigned long iopa(unsigned long addr); /* Values for nocacheflag and cmode */ From patchwork Fri Jan 13 17:10:12 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43455 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387827wrt; Fri, 13 Jan 2023 09:16:53 -0800 (PST) X-Google-Smtp-Source: AMrXdXtBM0eYHN3I3qzOVlYF3NZYLA5VRMlqwxwzD34gLiXTaW9XIiyMtSET/XjmeOpKjZm/25+8 X-Received: by 2002:a17:906:910:b0:7c0:f71b:8b3 with SMTP id i16-20020a170906091000b007c0f71b08b3mr64227351ejd.57.1673630213399; Fri, 13 Jan 2023 09:16:53 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630213; cv=none; d=google.com; s=arc-20160816; b=qwUr2hrNhRIy2X6ZqTyXUxzYhS4RMNt2ayGtKHwxO+QJzBNt+86g3btQwaAIfEBSnf qCPWUTvWBF2natHdiA0O4+hlT5dcn3IgfLS76ML8eAhyw7lyqLrTmrOdfv5yqxefYBPl wJ5gMAN4bA8cYisQl+TxOEsbnRK3NR/hjtImLgUss34MeN8zBxHeybtMpaWpsrgaOW3J drAqsdH21ADJYX/AYhrgACzHYhu5Sv0zAoaYgqD9gPeIVeZXldmYQ5sL0Eqni/eq18LB tN9WNo3x8Cxjhajt3YwcTExc6GHVh21sd7F1jbJIies1GXhlQ1AWNwYNQVkRa8w2ShpF 1EAg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=vL7N3yChGOYHwNR1EQW6+on7yuH1TSRlOudQuOuT5dI=; b=AEQz2/8YcrFyweQ3xJ0naRFbszAuhLntyYH+7jZcRY6Ip8mUepbV8g6yDgjYy2+Cn7 L+bSqqOBWugU4I5wQ0T1r/+B+C88UKFiuPyuSPvxRFXNJtbdXTdZ3c33GqzbAVd1sxmt XKx8CIdtT17Q72tLRwxU9MGUjb41tADYwDIo38wf3TXFslHncUmFcXoCBYJCfJz/RbnC f1+cKbYBFFWX+F5dMFmw5g343aMKokAeopBe1yy2Deu+AVJMA8G5+h7Aw9EJDGhhFH5B 04NYi8suDQnBQw/5AwfJ+uNo+hKM7QOntzYlvsuJ1ScfuI+AbJklb1As/w6wXVW/XuuO YuSA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=b4a5vkMF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id oq19-20020a170906cc9300b007f1501a8c24si17850754ejb.216.2023.01.13.09.16.30; Fri, 13 Jan 2023 09:16:53 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=b4a5vkMF; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230343AbjAMRQO (ORCPT + 99 others); Fri, 13 Jan 2023 12:16:14 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54608 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229998AbjAMROq (ORCPT ); Fri, 13 Jan 2023 12:14:46 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 574B836335 for ; Fri, 13 Jan 2023 09:12:18 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629937; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vL7N3yChGOYHwNR1EQW6+on7yuH1TSRlOudQuOuT5dI=; b=b4a5vkMFZlfbBzSONZDImNHIXoN3a7qphSG+D9bTl9TIvX49aCtyyxTmqlsfbg5QCsX416 vhS4023HGEYzvx+PO0i/J3TvNxXMbddk9SZ0RtzcjqbFSVWmjBltKu5eob5c8bmMic3LeX viUptl5vjGAu9WNuKM9LrZYw6jzW+z8= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-426-2wVVkEYXP9C4ufK13_TE1g-1; Fri, 13 Jan 2023 12:12:12 -0500 X-MC-Unique: 2wVVkEYXP9C4ufK13_TE1g-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B555F29AA39A; Fri, 13 Jan 2023 17:12:10 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 5995440C2064; Fri, 13 Jan 2023 17:12:03 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Thomas Bogendoerfer Subject: [PATCH mm-unstable v1 12/26] mips/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:12 +0100 Message-Id: <20230113171026.582290-13-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928474743094942?= X-GMAIL-MSGID: =?utf-8?q?1754928474743094942?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE. On 64bit, steal one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. On 32bit we're able to locate unused bits. As the PTE layout for 32 bit is very confusing, document it a bit better. While at it, mask the type in __swp_entry()/mk_swap_pte(). Cc: Thomas Bogendoerfer Signed-off-by: David Hildenbrand --- arch/mips/include/asm/pgtable-32.h | 88 ++++++++++++++++++++++++++---- arch/mips/include/asm/pgtable-64.h | 23 ++++++-- arch/mips/include/asm/pgtable.h | 36 ++++++++++++ 3 files changed, 131 insertions(+), 16 deletions(-) diff --git a/arch/mips/include/asm/pgtable-32.h b/arch/mips/include/asm/pgtable-32.h index b40a0e69fccc..ba0016709a1a 100644 --- a/arch/mips/include/asm/pgtable-32.h +++ b/arch/mips/include/asm/pgtable-32.h @@ -191,49 +191,113 @@ static inline pte_t pfn_pte(unsigned long pfn, pgprot_t prot) #define pte_page(x) pfn_to_page(pte_pfn(x)) +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + */ #if defined(CONFIG_CPU_R3K_TLB) -/* Swap entries must have VALID bit cleared. */ +/* + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <----------- offset ------------> < type -> V G E 0 0 0 0 0 0 P + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P), _PAGE_VALID (V) and_PAGE_GLOBAL (G) have to remain + * unused. + */ #define __swp_type(x) (((x).val >> 10) & 0x1f) #define __swp_offset(x) ((x).val >> 15) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 10) | ((offset) << 15) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x1f) << 10) | ((offset) << 15) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1 << 7) + #else #if defined(CONFIG_XPA) -/* Swap entries must have VALID and GLOBAL bits cleared. */ +/* + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * 0 0 0 0 0 0 E P <------------------ zeroes -------------------> + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <----------------- offset ------------------> < type -> V G 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P), _PAGE_VALID (V) and_PAGE_GLOBAL (G) have to remain + * unused. + */ #define __swp_type(x) (((x).val >> 4) & 0x1f) #define __swp_offset(x) ((x).val >> 9) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 4) | ((offset) << 9) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x1f) << 4) | ((offset) << 9) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t) { 0, (x).val }) +/* + * We borrow bit 57 (bit 25 in the low PTE) to store the exclusive marker in + * swap PTEs. + */ +#define _PAGE_SWP_EXCLUSIVE (1 << 25) + #elif defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) -/* Swap entries must have VALID and GLOBAL bits cleared. */ +/* + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <------------------ zeroes -------------------> E P 0 0 0 0 0 0 + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <------------------- offset --------------------> < type -> V G + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P), _PAGE_VALID (V) and_PAGE_GLOBAL (G) have to remain + * unused. + */ #define __swp_type(x) (((x).val >> 2) & 0x1f) #define __swp_offset(x) ((x).val >> 7) -#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 2) | ((offset) << 7) }) +#define __swp_entry(type, offset) ((swp_entry_t) { (((type) & 0x1f) << 2) | ((offset) << 7) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t) { 0, (x).val }) +/* + * We borrow bit 39 (bit 7 in the low PTE) to store the exclusive marker in swap + * PTEs. + */ +#define _PAGE_SWP_EXCLUSIVE (1 << 7) + #else /* - * Constraints: - * _PAGE_PRESENT at bit 0 - * _PAGE_MODIFIED at bit 4 - * _PAGE_GLOBAL at bit 6 - * _PAGE_VALID at bit 7 + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <------------- offset --------------> < type -> 0 0 0 0 0 0 E P + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P), _PAGE_VALID (V) and_PAGE_GLOBAL (G) have to remain + * unused. The location of V and G varies. */ #define __swp_type(x) (((x).val >> 8) & 0x1f) #define __swp_offset(x) ((x).val >> 13) -#define __swp_entry(type,offset) ((swp_entry_t) { ((type) << 8) | ((offset) << 13) }) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) << 8) | ((offset) << 13) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +/* We borrow bit 1 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1 << 1) + #endif /* defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) */ #endif /* defined(CONFIG_CPU_R3K_TLB) */ diff --git a/arch/mips/include/asm/pgtable-64.h b/arch/mips/include/asm/pgtable-64.h index c6310192b654..98e24e3e7f2b 100644 --- a/arch/mips/include/asm/pgtable-64.h +++ b/arch/mips/include/asm/pgtable-64.h @@ -320,16 +320,31 @@ extern void pud_init(void *addr); extern void pmd_init(void *addr); /* - * Non-present pages: high 40 bits are offset, next 8 bits type, - * low 16 bits zero. + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <--------------------------- offset --------------------------- + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * --------------> E <-- type ---> <---------- zeroes -----------> + * + * E is the exclusive marker that is not stored in swap entries. */ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) -{ pte_t pte; pte_val(pte) = (type << 16) | (offset << 24); return pte; } +{ pte_t pte; pte_val(pte) = ((type & 0x7f) << 16) | (offset << 24); return pte; } -#define __swp_type(x) (((x).val >> 16) & 0xff) +#define __swp_type(x) (((x).val >> 16) & 0x7f) #define __swp_offset(x) ((x).val >> 24) #define __swp_entry(type, offset) ((swp_entry_t) { pte_val(mk_swap_pte((type), (offset))) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +/* We borrow bit 23 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1 << 23) + #endif /* _ASM_PGTABLE_64_H */ diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index a68c0b01d8cd..711874cee8e4 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -528,6 +528,42 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) } #endif +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +#if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte.pte_low & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte.pte_low |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte.pte_low &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} +#else +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} +#endif extern void __update_tlb(struct vm_area_struct *vma, unsigned long address, pte_t pte); From patchwork Fri Jan 13 17:10:13 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43456 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp387868wrt; Fri, 13 Jan 2023 09:16:59 -0800 (PST) X-Google-Smtp-Source: AMrXdXsymZ8k2X7WKFZX+nAO8h/ODnz3mkw1NrwWe5ri59jCuHraK8mhfMgw9LB4cFTkUDHkBCgs X-Received: by 2002:aa7:c9c7:0:b0:494:dd8c:1098 with SMTP id i7-20020aa7c9c7000000b00494dd8c1098mr442500edt.22.1673630218877; Fri, 13 Jan 2023 09:16:58 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630218; cv=none; d=google.com; s=arc-20160816; b=blWh6xidMI26dvDpL4AAp5U6kRHbhCSO/2KR0D5hB1EcMhLYL4bEQz9ZNQSiUr3XM+ bh5GTrt0RCau7jo4jXEAqdRbPFhEVcV+hvgOVsBohFblmoR6f/qAF/aRnvRoX9FPQ+HA 288HnyuSn7lZOn240UWPpE6dHoEG2VenPQnJFW47UN1hlc9AcxOquFL2JAhITNjp3XtR puABecoiHd8jasHNAdEiutCg6z1sxNucsSnVSNhAHjJJS2BZqA2ZlG558waP5wG+5x6Q zv9LaaZK83PFnoWa13IW43CPUerWMYCUB8SYZ2Bc1K2fpRxggTRHnQr06NeL/m8sne2s ilJA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=KugC5IzCnqRMc64O7OXoMEHEE6o8464VZZ+3WYeoi2w=; b=QX4qN7GTfp8+iIXRaI1Gaf9O5C8O5yKL+KyEWbAUsmQCGDdWWacBSVXEaeJTuLRpFC lhMycgQ8QjYaXpRPtG3kZvxEToDhtshzTIdsx/FcBBflX9GzhDiklj8BNCycOT1CNDBX jWyNVLDBMWdFdLsMxWMGZlzB8dy1/0rF9ddeviJVgXPxke0ds+qtpALG89PbXRSzfZ5b tg1h4lOm8qhgivWIGpY1YsDx4UpMPREMk/EZ79qyqijPdlBMSZBmE8w17sDZYNkEW496 zywL8b/x2JCDC6pIhiqLBUnQH+v24QlmeSMdT0D/D7dUXUtcx0nCxEwoGNuI9m50Br03 hNqg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="Q+K/HdJ4"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id c26-20020aa7c99a000000b0048e82d753a3si16709476edt.227.2023.01.13.09.16.34; Fri, 13 Jan 2023 09:16:58 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="Q+K/HdJ4"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230119AbjAMRQT (ORCPT + 99 others); Fri, 13 Jan 2023 12:16:19 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53212 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230155AbjAMROz (ORCPT ); Fri, 13 Jan 2023 12:14:55 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 7D6928B74B for ; Fri, 13 Jan 2023 09:12:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629941; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=KugC5IzCnqRMc64O7OXoMEHEE6o8464VZZ+3WYeoi2w=; b=Q+K/HdJ4vQwiJcAA24zancsVQ+TdVn8QctYdL/55unaj2oeGIiE6TyDO7LdRDXDHtI8L/I Z8NX/knh4qKjuL+eSJcBIHKAfi9ffHbQno4clORHWu07GD7qm3RZR5lLSdyhe2Zse+qnqs 8EDPXrNaNUGw5neOMJMFyZ9SfzwLlPs= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-646-jLSXMt2pNqeaF2AAD5XPMQ-1; Fri, 13 Jan 2023 12:12:19 -0500 X-MC-Unique: jLSXMt2pNqeaF2AAD5XPMQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 9D212380671B; Fri, 13 Jan 2023 17:12:17 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 02EDF40C2064; Fri, 13 Jan 2023 17:12:10 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Dinh Nguyen Subject: [PATCH mm-unstable v1 13/26] nios2/mm: refactor swap PTE layout Date: Fri, 13 Jan 2023 18:10:13 +0100 Message-Id: <20230113171026.582290-14-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928480493599871?= X-GMAIL-MSGID: =?utf-8?q?1754928480493599871?= nios2 disables swap for a good reason: it doesn't even provide sufficient type bits as required by core MM. However, swap entries are nowadays also used for other purposes (migration entries, PTE markers, HWPoison, ...), and accidential use could be problematic. Let's properly use 5 bits for the swap type and document the layout. Bits 26--31 should get ignored by hardware completely, so they can be used. Cc: Dinh Nguyen Signed-off-by: David Hildenbrand --- arch/nios2/include/asm/pgtable.h | 18 ++++++++++-------- 1 file changed, 10 insertions(+), 8 deletions(-) diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index ab793bc517f5..d1e5c9eb4643 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -232,19 +232,21 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) __FILE__, __LINE__, pgd_val(e)) /* - * Encode and decode a swap entry (must be !pte_none(pte) && !pte_present(pte): + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). * - * 31 30 29 28 27 26 25 24 23 22 21 20 19 18 ... 1 0 - * 0 0 0 0 type. 0 0 0 0 0 0 offset......... + * Format of swap PTEs: * - * This gives us up to 2**2 = 4 swap files and 2**20 * 4K = 4G per swap file. + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * 0 < type -> 0 0 0 0 0 0 <-------------- offset ---------------> * - * Note that the offset field is always non-zero, thus !pte_none(pte) is always - * true. + * Note that the offset field is always non-zero if the swap type is 0, thus + * !pte_none() is always true. */ -#define __swp_type(swp) (((swp).val >> 26) & 0x3) +#define __swp_type(swp) (((swp).val >> 26) & 0x1f) #define __swp_offset(swp) ((swp).val & 0xfffff) -#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x3) << 26) \ +#define __swp_entry(type, off) ((swp_entry_t) { (((type) & 0x1f) << 26) \ | ((off) & 0xfffff) }) #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) From patchwork Fri Jan 13 17:10:14 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43457 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp388073wrt; Fri, 13 Jan 2023 09:17:26 -0800 (PST) X-Google-Smtp-Source: AMrXdXt2DRYLkavtkvV3avazVKzENz6qzU3z2CwkM+KVyBOZgo3wlXfNe5KSeBdp+Pjw4ek8YgQ6 X-Received: by 2002:a05:6a00:420d:b0:585:64a4:1858 with SMTP id cd13-20020a056a00420d00b0058564a41858mr26438327pfb.12.1673630246176; Fri, 13 Jan 2023 09:17:26 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630246; cv=none; d=google.com; s=arc-20160816; b=dh7yA6HHMO812n8+8E3HgbsGZFLMZLM+3dAzFo9JREfqVLvQJXp0n3uvDAD+EdHMRO 9deibADsHHankTC2Xz3HSNxwQxYyy0pY8rMSmVKEfUNBf41wm9CV6OY6UGSzhm9yaVkj uJscfxCUkcWM9xQCYahc8HqcevQJswzYifj3uXltUrqhWdC1unsI1XAk2TOgLd05PI8u 1kx2214owaeogwrSNA18rSeKCOMhpZ2O+CyCluUDhM4drtajlVV/sEfmtHRcMpCjMh83 l9ie3Drt//nkjEsT23+p5Ll9YMmqUF70HOtHymetd11acbViMWCO3rAh/pvTLjcxD1J0 fADA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=EeU2y0OYHKgx8U/PANyBx/2XuleLv4VIrJJxaFNmqf8=; b=uHNcFt7aN5AyX0KxX9gdaAP4QnuJXAVfmAaS5BopgcdvdmixreKq2JF+y34ByQ14dn x+P7KrijJ0aBM1xGZqMiEpYwMD4aN54butMZMHu+Wn+QG+pndXkL4NlDX8SigWzo0zJ5 BekC7jphrfH6zg+wbRHna8dbLJP1gVWDNZmxt3mxdQwsagUmUOdMBsw5hjveHQckWfwr nvkixsLV7sLJRWYD0WZ9/rb7TBTi0yS3e49UykBzEuNy/JCNqcspxz5EwSGBPvfmBwRH t28I9GlvVaW3afYc/K/Vmk8T4PT4mocISy08cds/idYhQh0Mxbhe5G3LiV2MLin4D7Pz VasA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Svnvl6Is; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id e190-20020a6369c7000000b0047874cf7b40si20605089pgc.178.2023.01.13.09.17.12; Fri, 13 Jan 2023 09:17:26 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Svnvl6Is; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230252AbjAMRRH (ORCPT + 99 others); Fri, 13 Jan 2023 12:17:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53204 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230300AbjAMRPu (ORCPT ); Fri, 13 Jan 2023 12:15:50 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 160E38B779 for ; Fri, 13 Jan 2023 09:12:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629950; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=EeU2y0OYHKgx8U/PANyBx/2XuleLv4VIrJJxaFNmqf8=; b=Svnvl6IsYLF/avYXhxOoX5DOjJZbP9h5zXd23JER2QBIR/4bTPx2PG3MvA2xMSggga5qQc i7dZtxA1U3qu7IMQBxRaTlgpnf6Mt97cIHz63MYVEORKLO9mMtw1l6tr/U15SaSMgAiwcA nk8LNfNsIcVETCkmCA/HFPu2UQl4BsY= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-86-oCTSLD83Ooa0ioE_-N0TXQ-1; Fri, 13 Jan 2023 12:12:26 -0500 X-MC-Unique: oCTSLD83Ooa0ioE_-N0TXQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 93ED685A588; Fri, 13 Jan 2023 17:12:24 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id EF76240C2005; Fri, 13 Jan 2023 17:12:17 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Thomas Bogendoerfer Subject: [PATCH mm-unstable v1 14/26] nios2/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:14 +0100 Message-Id: <20230113171026.582290-15-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928509167331906?= X-GMAIL-MSGID: =?utf-8?q?1754928509167331906?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using the yet-unused bit 31. Cc: Thomas Bogendoerfer Signed-off-by: David Hildenbrand --- arch/nios2/include/asm/pgtable-bits.h | 3 +++ arch/nios2/include/asm/pgtable.h | 22 +++++++++++++++++++++- 2 files changed, 24 insertions(+), 1 deletion(-) diff --git a/arch/nios2/include/asm/pgtable-bits.h b/arch/nios2/include/asm/pgtable-bits.h index bfddff383e89..724f9b08b1d1 100644 --- a/arch/nios2/include/asm/pgtable-bits.h +++ b/arch/nios2/include/asm/pgtable-bits.h @@ -31,4 +31,7 @@ #define _PAGE_ACCESSED (1<<26) /* page referenced */ #define _PAGE_DIRTY (1<<27) /* dirty page */ +/* We borrow bit 31 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<31) + #endif /* _ASM_NIOS2_PGTABLE_BITS_H */ diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index d1e5c9eb4643..05999da01731 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -239,7 +239,9 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) * * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 - * 0 < type -> 0 0 0 0 0 0 <-------------- offset ---------------> + * E < type -> 0 0 0 0 0 0 <-------------- offset ---------------> + * + * E is the exclusive marker that is not stored in swap entries. * * Note that the offset field is always non-zero if the swap type is 0, thus * !pte_none() is always true. @@ -251,6 +253,24 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + extern void __init paging_init(void); extern void __init mmu_init(void); From patchwork Fri Jan 13 17:10:15 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43458 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp388236wrt; Fri, 13 Jan 2023 09:17:48 -0800 (PST) X-Google-Smtp-Source: AMrXdXuF+BYXvz+gR/lZMqSDOl8hrbGwDJZlYCj0KhEq7voZON9xs992rLOnXrKxu+J3PUNBU659 X-Received: by 2002:a05:6a20:d686:b0:b6:5d9f:cd8c with SMTP id it6-20020a056a20d68600b000b65d9fcd8cmr11623745pzb.54.1673630268258; Fri, 13 Jan 2023 09:17:48 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630268; cv=none; d=google.com; s=arc-20160816; b=Y+y/+i603pd84eHZv3rsFHZ5hZDcwPa1pgk+UvF2bYP0AbfZEjn66WoyejLzHaVGJh YAcDgrAwU4U86HTjETyvNuicKjwzU6aYXMVZwxhA/WbpUQQP6mQ8ig3oGfCUeRKAlfeI noLG8/yCGeg8uZwCKpqYyPJPkCb4uJ52qHzeQ31bwrTLblpy372kRUmMuthXF6y+ocl0 8njrNfwNyII0kGu8Ern+CWx5svEd32IqJcuO8Zpus6+rHuSBanjMtwyM20tWJBsH22Ay IKK6Nk0wKKX2PuzBz56zBM433Ulc4Vdt904d01S+CCmA00GIxztgNXN7kfIwFISCshZ9 6DeA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Yg5//Yy7TNKL4+cSLuxDja5DgwYoaRFdwhUA2l2XqT4=; b=Xf2E8lL+HsIpvP5wF7nxRpQ1qmCq1ufqR6Lil7iMzHryFiQyHXAjXEICRTpCehukhw 7KdEHu+Kr4zQEKG5Lg+E6wUmyRuSMw2ToMyA/k1YgKcLYIZkW3u84HkOffrq2dA/s3yg jYvTYjGCU1yUHeahKy0wNzjViCkcunnCEEVkvgFVi0000B77mNcVEb4ElDPI9N/9t9B0 2AT4knUxGK5w3JomePaljJaynBKNAddZb+BljB9bhTiuMQzJw91tHXvzHyvKg5XnqrmV cWS/OI4PVihLb2Dj2gUrbvW7UUwGBBawe6Z1DEaNlPbVplj4gRrLmKWjlu0iArx9nwxD 1G8Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="K/R0asA1"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id z5-20020a170903018500b00189fdf3b84csi1773994plg.385.2023.01.13.09.17.34; Fri, 13 Jan 2023 09:17:48 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="K/R0asA1"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230172AbjAMRR3 (ORCPT + 99 others); Fri, 13 Jan 2023 12:17:29 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54578 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230059AbjAMRQq (ORCPT ); Fri, 13 Jan 2023 12:16:46 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CB9668BF12 for ; Fri, 13 Jan 2023 09:12:37 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629956; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Yg5//Yy7TNKL4+cSLuxDja5DgwYoaRFdwhUA2l2XqT4=; b=K/R0asA1g7rI08+IVWKoIyCcZmIHxJWl49AzyQfmHfy17m43+6fMCf9x/xIcHLYjwCgMzN 9YkKru6Ya8YxOerM391QdtLMVlSm1/MchLKVIgaGaxIbPh7zv5lf4dOQbj6jQqDsm7kEgK XA7r7c6OukF25lDLkJq3TTrcDra/Igk= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-533-CQX355qCMESVPPSct6yrTA-1; Fri, 13 Jan 2023 12:12:33 -0500 X-MC-Unique: CQX355qCMESVPPSct6yrTA-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 991F4380610A; Fri, 13 Jan 2023 17:12:31 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id DA27840C2064; Fri, 13 Jan 2023 17:12:24 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Stefan Kristiansson , Stafford Horne Subject: [PATCH mm-unstable v1 15/26] openrisc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:15 +0100 Message-Id: <20230113171026.582290-16-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928531800183168?= X-GMAIL-MSGID: =?utf-8?q?1754928531800183168?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. While at it, mask the type in __swp_entry(). Cc: Stefan Kristiansson Cc: Stafford Horne Signed-off-by: David Hildenbrand --- arch/openrisc/include/asm/pgtable.h | 41 +++++++++++++++++++++++++---- 1 file changed, 36 insertions(+), 5 deletions(-) diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h index 6477c17b3062..903b32d662ab 100644 --- a/arch/openrisc/include/asm/pgtable.h +++ b/arch/openrisc/include/asm/pgtable.h @@ -154,6 +154,9 @@ extern void paging_init(void); #define _KERNPG_TABLE \ (_PAGE_BASE | _PAGE_SRE | _PAGE_SWE | _PAGE_ACCESSED | _PAGE_DIRTY) +/* We borrow bit 11 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_U_SHARED + #define PAGE_NONE __pgprot(_PAGE_ALL) #define PAGE_READONLY __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE) #define PAGE_READONLY_X __pgprot(_PAGE_ALL | _PAGE_URE | _PAGE_SRE | _PAGE_EXEC) @@ -385,16 +388,44 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, /* __PHX__ FIXME, SWAP, this probably doesn't work */ -/* Encode and de-code a swap entry (must be !pte_none(e) && !pte_present(e)) */ -/* Since the PAGE_PRESENT bit is bit 4, we can use the bits above */ - -#define __swp_type(x) (((x).val >> 5) & 0x7f) +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <-------------- offset ---------------> E <- type --> 0 0 0 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + * The zero'ed bits include _PAGE_PRESENT. + */ +#define __swp_type(x) (((x).val >> 5) & 0x3f) #define __swp_offset(x) ((x).val >> 12) #define __swp_entry(type, offset) \ - ((swp_entry_t) { ((type) << 5) | ((offset) << 12) }) + ((swp_entry_t) { (((type) & 0x3f) << 5) | ((offset) << 12) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + typedef pte_t *pte_addr_t; #endif /* __ASSEMBLY__ */ From patchwork Fri Jan 13 17:10:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43459 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp388627wrt; Fri, 13 Jan 2023 09:18:35 -0800 (PST) X-Google-Smtp-Source: AMrXdXvWqlzezLymk2LiXy2ZUh6F/Gcgy06mz7m9vfTm9PHaJLA4YfTdHWxWiueny6wkei9AwY5z X-Received: by 2002:a05:6a20:9b87:b0:9d:efd3:66ec with SMTP id mr7-20020a056a209b8700b0009defd366ecmr93351613pzb.51.1673630315326; Fri, 13 Jan 2023 09:18:35 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630315; cv=none; d=google.com; s=arc-20160816; b=wYgmYncaSkmiTev5y4vtVOjQiPhlQOJ5fgEysvY4hNEjll0vOTzvhaEDMQoLyrEERb dZyV/51mZUzNJbVvmmIhdpP2/ht4tZwQSBHtPg7KqL6AAEt92E4mPuUzBIfm5WEI3VSt 7fn3prXaVk7CmViP72vtpNpgyfE1sptF0F4MoB7/SQk2wjfkeHGIQtYrunJZv+m7wUeR mQ6SU5jyYVWsmCKt8IZpzGZtqEQReecVlVEvozjtxE5K3AsL5XU/MDtu29Nq0OLHtMhV eAq7BuO2HlLS0LQE6NehFqU1rhj3CPiF7Zex066JBGCO4rrIN6CDHzYyRmrARNA8j4G7 gXeA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Nb3/Kg+q8w8ft77T7rabV7x4+F6BGLijJ0EWAhVZvAg=; b=xnr6nKrOyR4QuYBJYA0HUkmUX/HWfNk88QLmW5WPP6gmAR2fUmj4aZH4oA93r/GUbN LGxiPepqRx4sj2Lochb6aArLlAFU8FZMu/aspk8xfezNEcotja4EuhSvnBE33nTsKKOd dAsn3DUGcI2GSY3MwNc3fFLaKYjQ9qWvzH/NYm2xR/vaFslAvZTRLMKGREHprOlATHUt qRzZej6LgFKP+VqVje8OTOOxfm2GEUuQvvu66TtpVaAur6QAYrkit/huLkhereqtVM2o nUUcWqvj6yxbRddc2UbQyiDGKw0BnCTDhooyhP693RLeIN//gArl2IErCq/ZIpanEmZJ Bdqg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=FYP+AGy5; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. 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Bottomley" , Helge Deller Subject: [PATCH mm-unstable v1 16/26] parisc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:16 +0100 Message-Id: <20230113171026.582290-17-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928581674968614?= X-GMAIL-MSGID: =?utf-8?q?1754928581674968614?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using the yet-unused _PAGE_ACCESSED location in the swap PTE. Looking at pte_present() and pte_none() checks, there seems to be no actual reason why we cannot use it: we only have to make sure we're not using _PAGE_PRESENT. Reusing this bit avoids having to steal one bit from the swap offset. Cc: "James E.J. Bottomley" Cc: Helge Deller Signed-off-by: David Hildenbrand --- arch/parisc/include/asm/pgtable.h | 41 ++++++++++++++++++++++++++++--- 1 file changed, 38 insertions(+), 3 deletions(-) diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h index ea357430aafe..3033bb88df34 100644 --- a/arch/parisc/include/asm/pgtable.h +++ b/arch/parisc/include/asm/pgtable.h @@ -218,6 +218,9 @@ extern void __update_cache(pte_t pte); #define _PAGE_KERNEL_RWX (_PAGE_KERNEL_EXEC | _PAGE_WRITE) #define _PAGE_KERNEL (_PAGE_KERNEL_RO | _PAGE_WRITE) +/* We borrow bit 23 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED + /* The pgd/pmd contains a ptr (in phys addr space); since all pgds/pmds * are page-aligned, we don't care about the PAGE_OFFSET bits, except * for a few meta-information bits, so we shift the address to be @@ -394,17 +397,49 @@ extern void paging_init (void); #define update_mmu_cache(vms,addr,ptep) __update_cache(*ptep) -/* Encode and de-code a swap entry */ - +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs (32bit): + * + * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * <---------------- offset -----------------> P E < type -> + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P) must be 0. + * + * For the 64bit version, the offset is extended by 32bit. + */ #define __swp_type(x) ((x).val & 0x1f) #define __swp_offset(x) ( (((x).val >> 6) & 0x7) | \ (((x).val >> 8) & ~0x7) ) -#define __swp_entry(type, offset) ((swp_entry_t) { (type) | \ +#define __swp_entry(type, offset) ((swp_entry_t) { \ + ((type) & 0x1f) | \ ((offset & 0x7) << 6) | \ ((offset & ~0x7) << 8) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + static inline int ptep_test_and_clear_young(struct vm_area_struct *vma, unsigned long addr, pte_t *ptep) { pte_t pte; From patchwork Fri Jan 13 17:10:17 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43460 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp388915wrt; Fri, 13 Jan 2023 09:19:11 -0800 (PST) X-Google-Smtp-Source: AMrXdXtJ4fEoyDMUUdwl5hyG2O9j2gkBXurEvQo3U1w1v58wf1uS5Yx5szqYh6uWtjS+GSSUv7qD X-Received: by 2002:a05:6a00:1503:b0:589:8560:a39d with SMTP id q3-20020a056a00150300b005898560a39dmr19822653pfu.0.1673630351280; Fri, 13 Jan 2023 09:19:11 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630351; cv=none; d=google.com; s=arc-20160816; b=RR/DiYGn20nSYJvVyGmOXKPlHZjgHbQYKi+57MaG9vDWjUm790D/nGARtSQXvswbD/ WCrMrLbK96BwFFNreueszK5JKzaGprcIqpt3P5wm4A8Qe80ras+4f9mCBb7mCQl/fv02 LXXjY52CS1kQH2LLcfEbMDu5hCAHsQmcBQDlMO7OJAH+iD3qVQQP2UXHqNZaRWLg3gyq 9tzT2jaI9ojPnGnxPl8rccrgoVmJiYnbNfPnmO5QBtn/DTWolzaCwNocUWd2A9Trauc2 ERu1REqHsfpFKHdj3B2Altz+M4kBJt/CXB17ci3z94OZSgIf6nxjtjYHljBaVJYr8miR qxUg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=l/pOewF7neptUo6af+r5FxFOsv+W3FPHbMBwYM5K1LM=; b=zfZjxu6rCRxnL/sIztBoEIOpYWLZxJIDkX/4PSFkDRAnmAdinX+Bg3QS0iyrW7mlFC epyp1w3UiQBRvkKPv0PvbZNMHVCyG7vuxUUWuW3ZVgXgTcjyWqWW/ik4AT8lWjFhWYoZ eR1Acv1YIO1dKV2Ut52uOdERYlGQlQ9PKRpuSCLTzG7HjgmlN5lR8gSxSheKE8PGVWE/ fIwkSlUOmBcYgIhkGNIRm23mZrCycLSHmKp3HusAqZ2XiCLvSgtCRmlc6cGXY5UMUk3N 2ANNkIhzuK0F3t1CK5XLGvWx2fqZOeOhlEmQBFN/GKaCC/aKbYK92MjeTH7Gj9g7IJrU hhww== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=DsNgGMg0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id e2-20020a637442000000b00477257f2f01si21658293pgn.339.2023.01.13.09.18.57; Fri, 13 Jan 2023 09:19:11 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=DsNgGMg0; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229952AbjAMRSt (ORCPT + 99 others); Fri, 13 Jan 2023 12:18:49 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54846 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230239AbjAMRSE (ORCPT ); Fri, 13 Jan 2023 12:18:04 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6D4868CBCF for ; Fri, 13 Jan 2023 09:12:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629974; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=l/pOewF7neptUo6af+r5FxFOsv+W3FPHbMBwYM5K1LM=; b=DsNgGMg0pNPGS9lwbMCTE6AOHeLxTJ0p75auMYGoWnEgD1OReVn8zF/Bxz5z2pS1MJ0VKF BWJ20v5ZAIkV1xp6btLOY2hYpg3A/BJL2KjNar7l6uSBKII9Rz3RcbOD4DANReo8aEDLON Ijgu+B1SaYOp+pR2M7tcT8aaXVCbyW8= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-524-EGasiiu4MBSUSDxxLJu0-g-1; Fri, 13 Jan 2023 12:12:47 -0500 X-MC-Unique: EGasiiu4MBSUSDxxLJu0-g-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id AF64E3C0254D; Fri, 13 Jan 2023 17:12:46 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 068BC40C2064; Fri, 13 Jan 2023 17:12:38 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Michael Ellerman , Nicholas Piggin , Christophe Leroy Subject: [PATCH mm-unstable v1 17/26] powerpc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit book3s Date: Fri, 13 Jan 2023 18:10:17 +0100 Message-Id: <20230113171026.582290-18-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928619168364015?= X-GMAIL-MSGID: =?utf-8?q?1754928619168364015?= We already implemented support for 64bit book3s in commit bff9beaa2e80 ("powerpc/pgtable: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE for book3s") Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE also in 32bit by reusing yet unused LSB 2 / MSB 29. There seems to be no real reason why that bit cannot be used, and reusing it avoids having to steal one bit from the swap offset. While at it, mask the type in __swp_entry(). Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Signed-off-by: David Hildenbrand Acked-by: Michael Ellerman (powerpc) --- arch/powerpc/include/asm/book3s/32/pgtable.h | 38 +++++++++++++++++--- 1 file changed, 33 insertions(+), 5 deletions(-) diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h index 75823f39e042..0ecb3a58f23f 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -42,6 +42,9 @@ #define _PMD_PRESENT_MASK (PAGE_MASK) #define _PMD_BAD (~PAGE_MASK) +/* We borrow the _PAGE_USER bit to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_USER + /* And here we include common definitions */ #define _PAGE_KERNEL_RO 0 @@ -363,17 +366,42 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma, #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) /* - * Encode and decode a swap entry. - * Note that the bits we use in a PTE for representing a swap entry - * must not include the _PAGE_PRESENT bit or the _PAGE_HASHPTE bit (if used). - * -- paulus + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs (32bit PTEs): + * + * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * <----------------- offset --------------------> < type -> E H P + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_PRESENT (P) and __PAGE_HASHPTE (H) must be 0. + * + * For 64bit PTEs, the offset is extended by 32bit. */ #define __swp_type(entry) ((entry).val & 0x1f) #define __swp_offset(entry) ((entry).val >> 5) -#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) & 0x1f) | ((offset) << 5) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE); +} + /* Generic accessors to PTE bits */ static inline int pte_write(pte_t pte) { return !!(pte_val(pte) & _PAGE_RW);} static inline int pte_read(pte_t pte) { return 1; } From patchwork Fri Jan 13 17:10:18 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43461 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp389186wrt; Fri, 13 Jan 2023 09:19:51 -0800 (PST) X-Google-Smtp-Source: AMrXdXuUeepCOP4gjVyuD8k8Tq0tLyzfAcpT0a7JWDSbFViG+p+N0yblIEoZCyTfgA0gMqf52h4Q X-Received: by 2002:a05:6a21:6d82:b0:ac:f68:d0f8 with SMTP id wl2-20020a056a216d8200b000ac0f68d0f8mr124399808pzb.23.1673630391632; Fri, 13 Jan 2023 09:19:51 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630391; cv=none; d=google.com; s=arc-20160816; b=aJkmHZ2IGgoHDclg9L/8gPK8oHl0Te72AHhoq3qVEZxhrjJ+FlBTUk+PLgOTwreY3R i0p7G4Qks75n9CMGzSXoldLKzxoHHmU1LHDiVkj4XSHvSlC/tTBqCn/vM9Tp5nsjeW1Q r5QOjXziE9jjS7YzCFQ8Vh5wFNUw5VFkQwvhdkJhQB+q6erAomuNcMXCb5KnkFT/s0E5 uKW7DZnDLNplh2FWCHUzOKR9UITBnCN7bffCXefnH1ymRd/zjtLsrNb3oSygQTN2RUhj dn3Sc6fTdrMR1J3ZQJGdoakRcCDTQfVi8lcHYTCMyyRLCnj/EtjsWqS1nKsP7RPlIQB4 Ubxg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=d4koFO1Rd5JsxS1w9J70NeM/1ARQlUK8g39ciPf8XFs=; b=dPqPiQABnymMcixfrSDLOoNMSidEW0xBJDA45JkvpNYYDEvtqhv7fDMYO+zEuIHxV7 WUtfsBwB+kHNsgteyOTWBIhLkKUKt4VvNXrXs+BoxYbw18kkM0XVCcRJUuNCDUsX/OLJ H1hhrTl05Rn1WOZoqNuKOun+Zg1FNEp5jp/KFfrjDPtEU9Llp8xtCDJL36R3gl89Bmlh dgulml0rk86fXdDn0N+K73AG7ispgi+Ea8v1tQbO1dxeK8B3Ei5KP+QXrxJa9qMKdElo dOIEY2BCkc560gU4ji/mk3qEB5uWN44IdK1w0zqomaxA9XzYqHeX20q7V4FH8XrRom69 setw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="RcEfr5z/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id s18-20020a17090302d200b00189d63396c2si21474063plk.35.2023.01.13.09.19.37; Fri, 13 Jan 2023 09:19:51 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="RcEfr5z/"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230198AbjAMRTA (ORCPT + 99 others); Fri, 13 Jan 2023 12:19:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55718 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229954AbjAMRSU (ORCPT ); Fri, 13 Jan 2023 12:18:20 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 443C287F3E for ; Fri, 13 Jan 2023 09:12:59 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629978; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=d4koFO1Rd5JsxS1w9J70NeM/1ARQlUK8g39ciPf8XFs=; b=RcEfr5z/A2xWZ6BMTd6dtscCkX4TbYHqCPob4zQ1LWrqCLTj8ZgXSIj0mb0jgE9nxbjyKY sLqpfqnOW18y09YJuXcEdvMEGpFJ2NufSeMKVFkCXYh43icYNcwlrvWWxwYUiGUt2Na1Wi LVhKWj0dxf0BRsuIV2qFDXW5bhfD7EQ= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-154-7Ydxc8FGP4mTPM8Vt8NwFg-1; Fri, 13 Jan 2023 12:12:56 -0500 X-MC-Unique: 7Ydxc8FGP4mTPM8Vt8NwFg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id D464E101A521; Fri, 13 Jan 2023 17:12:54 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 032F540C2064; Fri, 13 Jan 2023 17:12:46 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Michael Ellerman , Nicholas Piggin , Christophe Leroy Subject: [PATCH mm-unstable v1 18/26] powerpc/nohash/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:18 +0100 Message-Id: <20230113171026.582290-19-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-1.8 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,PDS_BTC_ID, RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928661518779845?= X-GMAIL-MSGID: =?utf-8?q?1754928661518779845?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit and 64bit. On 64bit, let's use MSB 56 (LSB 7), located right next to the page type. On 32bit, let's use LSB 2 to avoid stealing one bit from the swap offset. There seems to be no real reason why these bits cannot be used for swap PTEs. The important part is that _PAGE_PRESENT and _PAGE_HASHPTE remain 0. While at it, mask the type in __swp_entry() and remove _PAGE_BIT_SWAP_TYPE from pte-e500.h: while it was used in 64bit code it was ignored in 32bit code. Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Signed-off-by: David Hildenbrand --- arch/powerpc/include/asm/nohash/32/pgtable.h | 22 +++++++++++++---- arch/powerpc/include/asm/nohash/32/pte-40x.h | 6 ++--- arch/powerpc/include/asm/nohash/32/pte-44x.h | 18 ++++---------- arch/powerpc/include/asm/nohash/32/pte-85xx.h | 4 ++-- arch/powerpc/include/asm/nohash/64/pgtable.h | 24 ++++++++++++++++--- arch/powerpc/include/asm/nohash/pgtable.h | 16 +++++++++++++ arch/powerpc/include/asm/nohash/pte-e500.h | 1 - 7 files changed, 63 insertions(+), 28 deletions(-) diff --git a/arch/powerpc/include/asm/nohash/32/pgtable.h b/arch/powerpc/include/asm/nohash/32/pgtable.h index 70edad44dff6..fec56d965f00 100644 --- a/arch/powerpc/include/asm/nohash/32/pgtable.h +++ b/arch/powerpc/include/asm/nohash/32/pgtable.h @@ -360,18 +360,30 @@ static inline int pte_young(pte_t pte) #endif #define pmd_page(pmd) pfn_to_page(pmd_pfn(pmd)) + /* - * Encode and decode a swap entry. - * Note that the bits we use in a PTE for representing a swap entry - * must not include the _PAGE_PRESENT bit. - * -- paulus + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs (32bit PTEs): + * + * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * <------------------ offset -------------------> < type -> E 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + * + * For 64bit PTEs, the offset is extended by 32bit. */ #define __swp_type(entry) ((entry).val & 0x1f) #define __swp_offset(entry) ((entry).val >> 5) -#define __swp_entry(type, offset) ((swp_entry_t) { (type) | ((offset) << 5) }) +#define __swp_entry(type, offset) ((swp_entry_t) { ((type) & 0x1f) | ((offset) << 5) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) +/* We borrow LSB 2 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x000004 + #endif /* !__ASSEMBLY__ */ #endif /* __ASM_POWERPC_NOHASH_32_PGTABLE_H */ diff --git a/arch/powerpc/include/asm/nohash/32/pte-40x.h b/arch/powerpc/include/asm/nohash/32/pte-40x.h index 2d3153cfc0d7..6fe46e754556 100644 --- a/arch/powerpc/include/asm/nohash/32/pte-40x.h +++ b/arch/powerpc/include/asm/nohash/32/pte-40x.h @@ -27,9 +27,9 @@ * of the 16 available. Bit 24-26 of the TLB are cleared in the TLB * miss handler. Bit 27 is PAGE_USER, thus selecting the correct * zone. - * - PRESENT *must* be in the bottom two bits because swap cache - * entries use the top 30 bits. Because 40x doesn't support SMP - * anyway, M is irrelevant so we borrow it for PAGE_PRESENT. Bit 30 + * - PRESENT *must* be in the bottom two bits because swap PTEs + * use the top 30 bits. Because 40x doesn't support SMP anyway, M is + * irrelevant so we borrow it for PAGE_PRESENT. Bit 30 * is cleared in the TLB miss handler before the TLB entry is loaded. * - All other bits of the PTE are loaded into TLBLO without * modification, leaving us only the bits 20, 21, 24, 25, 26, 30 for diff --git a/arch/powerpc/include/asm/nohash/32/pte-44x.h b/arch/powerpc/include/asm/nohash/32/pte-44x.h index 78bc304f750e..b7ed13cee137 100644 --- a/arch/powerpc/include/asm/nohash/32/pte-44x.h +++ b/arch/powerpc/include/asm/nohash/32/pte-44x.h @@ -56,20 +56,10 @@ * above bits. Note that the bit values are CPU specific, not architecture * specific. * - * The kernel PTE entry holds an arch-dependent swp_entry structure under - * certain situations. In other words, in such situations some portion of - * the PTE bits are used as a swp_entry. In the PPC implementation, the - * 3-24th LSB are shared with swp_entry, however the 0-2nd three LSB still - * hold protection values. That means the three protection bits are - * reserved for both PTE and SWAP entry at the most significant three - * LSBs. - * - * There are three protection bits available for SWAP entry: - * _PAGE_PRESENT - * _PAGE_HASHPTE (if HW has) - * - * So those three bits have to be inside of 0-2nd LSB of PTE. - * + * The kernel PTE entry can be an ordinary PTE mapping a page or a special swap + * PTE. In case of a swap PTE, LSB 2-24 are used to store information regarding + * the swap entry. However LSB 0-1 still hold protection values, for example, + * to distinguish swap PTEs from ordinary PTEs, and must be used with care. */ #define _PAGE_PRESENT 0x00000001 /* S: PTE valid */ diff --git a/arch/powerpc/include/asm/nohash/32/pte-85xx.h b/arch/powerpc/include/asm/nohash/32/pte-85xx.h index 93fb8e11a3f1..16451df5ddb0 100644 --- a/arch/powerpc/include/asm/nohash/32/pte-85xx.h +++ b/arch/powerpc/include/asm/nohash/32/pte-85xx.h @@ -11,8 +11,8 @@ 32 33 34 35 36 ... 50 51 52 53 54 55 56 57 58 59 60 61 62 63 RPN...................... 0 0 U0 U1 U2 U3 UX SX UW SW UR SR - - PRESENT *must* be in the bottom three bits because swap cache - entries use the top 29 bits. + - PRESENT *must* be in the bottom two bits because swap PTEs use + the top 30 bits. */ diff --git a/arch/powerpc/include/asm/nohash/64/pgtable.h b/arch/powerpc/include/asm/nohash/64/pgtable.h index 879e9a6e5a87..287e25864ffa 100644 --- a/arch/powerpc/include/asm/nohash/64/pgtable.h +++ b/arch/powerpc/include/asm/nohash/64/pgtable.h @@ -276,22 +276,40 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma, #define pgd_ERROR(e) \ pr_err("%s:%d: bad pgd %08lx.\n", __FILE__, __LINE__, pgd_val(e)) -/* Encode and de-code a swap entry */ +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 1 1 1 1 1 1 1 1 1 2 2 2 2 2 2 2 2 2 2 3 3 + * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 + * <-------------------------- offset ---------------------------- + * + * 3 3 3 3 3 3 3 3 4 4 4 4 4 4 4 4 4 4 5 5 5 5 5 5 5 5 5 5 6 6 6 6 + * 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 + * --------------> <----------- zero ------------> E < type -> 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + */ #define MAX_SWAPFILES_CHECK() do { \ BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS); \ } while (0) #define SWP_TYPE_BITS 5 -#define __swp_type(x) (((x).val >> _PAGE_BIT_SWAP_TYPE) \ +#define __swp_type(x) (((x).val >> 2) \ & ((1UL << SWP_TYPE_BITS) - 1)) #define __swp_offset(x) ((x).val >> PTE_RPN_SHIFT) #define __swp_entry(type, offset) ((swp_entry_t) { \ - ((type) << _PAGE_BIT_SWAP_TYPE) \ + (((type) & 0x1f) << 2) \ | ((offset) << PTE_RPN_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val((pte)) }) #define __swp_entry_to_pte(x) __pte((x).val) +/* We borrow MSB 56 (LSB 7) to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x80 + int map_kernel_page(unsigned long ea, unsigned long pa, pgprot_t prot); void unmap_kernel_page(unsigned long va); extern int __meminit vmemmap_create_mapping(unsigned long start, diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index 69c3a050a3d8..5f4620940c2c 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -151,6 +151,22 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); } +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE); +} + /* Insert a PTE, top-level function is out of line. It uses an inline * low level function in the respective pgtable-* files */ diff --git a/arch/powerpc/include/asm/nohash/pte-e500.h b/arch/powerpc/include/asm/nohash/pte-e500.h index 0934e8965e4e..d8924cbd61e4 100644 --- a/arch/powerpc/include/asm/nohash/pte-e500.h +++ b/arch/powerpc/include/asm/nohash/pte-e500.h @@ -12,7 +12,6 @@ /* Architected bits */ #define _PAGE_PRESENT 0x000001 /* software: pte contains a translation */ #define _PAGE_SW1 0x000002 -#define _PAGE_BIT_SWAP_TYPE 2 #define _PAGE_BAP_SR 0x000004 #define _PAGE_BAP_UR 0x000008 #define _PAGE_BAP_SW 0x000010 From patchwork Fri Jan 13 17:10:19 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43462 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp389365wrt; Fri, 13 Jan 2023 09:20:15 -0800 (PST) X-Google-Smtp-Source: AMrXdXvnnfeNDLZPvRKbqSn8Kyds9QSoTCzEGIGmus9buoSOgRTjND7JimlpZP1zNhn5wAROqaM9 X-Received: by 2002:a17:902:e5cd:b0:192:9140:ee76 with SMTP id u13-20020a170902e5cd00b001929140ee76mr84273561plf.37.1673630414822; Fri, 13 Jan 2023 09:20:14 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630414; cv=none; d=google.com; s=arc-20160816; b=fdai19sEZQLdxMW6hl8F3MvgMRAaJLbGxNXWKkLm9bYoVe8k2068iafCoBcGhF5x3y pBAboN8ElnOPhOoiwT2s9NxF9d9g/8nmZv+DHeP8wekiLcR2TMpF9KKURZF7GVdE9NAl DaHKJ2FGLX1TkV1HFyip6G+Cir+zxXms22hThVCU5wjxb5Rc+VPzzJ07ge9z/s+dHCdY NzCT7YAJKuvU9+I2kTmoySU4aLeHu8Ev8z+lIF0dYoXn/wXSXJNqg1iwuly8OeVIJa5y HcbAH7kJrhd1skEwfvF3mGopDLA8S91tcPS9vKJAdwBrEYJjNNve/Y/waHpZkj+BUPVp S5+A== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=e/tSLKnjXWongAfZcI54y+AzPoBqzDq2scVqv8imtys=; b=ZObpL4Rup9kuXu0TQe0zmyNTk5zI+K7KamFoqpUrG+FPm5vM/vg8wpIUJIpA5VIzNO gVeZ7cqXsfXmX0IyW6hE51aL4+oHgKXrSINAO2jL+YNVkVV16ZYAKGVvAn+mJCl1s/97 p2+2C1YAwJbnJopm3/eGhVbCPtsX7DQsTa2Sjln3+uTROAcS5kcMa5VyNWRP1YIdFmq3 cul9X9NRXpOr99UQ8A4hBVZ+JhtfKQSWlF0hAKft80OBiy4s8dr5hZpFElE9u66ax/xg j4Bip9yU0VNNG38XANKf6a70phURPYGkzgnG6V3fYWiXnN3u9JY198PYgoMZkVzSna/z v/sg== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=jNsSR61e; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id l71-20020a63884a000000b004b68997578esi9899934pgd.61.2023.01.13.09.20.02; Fri, 13 Jan 2023 09:20:14 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=jNsSR61e; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230025AbjAMRT5 (ORCPT + 99 others); Fri, 13 Jan 2023 12:19:57 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55544 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230012AbjAMRTH (ORCPT ); Fri, 13 Jan 2023 12:19:07 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CFE9A90E5C for ; Fri, 13 Jan 2023 09:13:11 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629990; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=e/tSLKnjXWongAfZcI54y+AzPoBqzDq2scVqv8imtys=; b=jNsSR61e8sjMFTnwvQDACTt5L4ymAb51sXMPOBd/yCva84+Q7WcETUfEUDHCkK3QHPM1XU KUoYOuUj9FAVQxsLkoFcypeF0jt7SLjn3pL4RtblaCwU/LIOO/qiJUuHtGu3XSuY9Lx9uK m39h70na3TKwl7Uh8zBCMBugnuZ9/Ko= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-384-HNQxNCQiN5-TTLiX3HPNWw-1; Fri, 13 Jan 2023 12:13:03 -0500 X-MC-Unique: HNQxNCQiN5-TTLiX3HPNWw-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 2CFD61869B70; Fri, 13 Jan 2023 17:13:02 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2BFB940C2064; Fri, 13 Jan 2023 17:12:55 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Paul Walmsley , Palmer Dabbelt , Albert Ou Subject: [PATCH mm-unstable v1 19/26] riscv/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:19 +0100 Message-Id: <20230113171026.582290-20-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928685655477141?= X-GMAIL-MSGID: =?utf-8?q?1754928685655477141?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the offset. This reduces the maximum swap space per file: on 32bit to 16 GiB (was 32 GiB). Note that this bit does not conflict with swap PMDs and could also be used in swap PMD context later. While at it, mask the type in __swp_entry(). Cc: Paul Walmsley Cc: Palmer Dabbelt Cc: Albert Ou Signed-off-by: David Hildenbrand Acked-by: Palmer Dabbelt Reviewed-by: Palmer Dabbelt --- arch/riscv/include/asm/pgtable-bits.h | 3 +++ arch/riscv/include/asm/pgtable.h | 29 ++++++++++++++++++++++----- 2 files changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/riscv/include/asm/pgtable-bits.h b/arch/riscv/include/asm/pgtable-bits.h index b9e13a8fe2b7..f896708e8331 100644 --- a/arch/riscv/include/asm/pgtable-bits.h +++ b/arch/riscv/include/asm/pgtable-bits.h @@ -27,6 +27,9 @@ */ #define _PAGE_PROT_NONE _PAGE_GLOBAL +/* Used for swap PTEs only. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_ACCESSED + #define _PAGE_PFN_SHIFT 10 /* diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 4eba9a98d0e3..03a4728db039 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -724,16 +724,18 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ /* - * Encode and decode a swap entry + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). * * Format of swap PTE: * bit 0: _PAGE_PRESENT (zero) * bit 1 to 3: _PAGE_LEAF (zero) * bit 5: _PAGE_PROT_NONE (zero) - * bits 6 to 10: swap type - * bits 10 to XLEN-1: swap offset + * bit 6: exclusive marker + * bits 7 to 11: swap type + * bits 11 to XLEN-1: swap offset */ -#define __SWP_TYPE_SHIFT 6 +#define __SWP_TYPE_SHIFT 7 #define __SWP_TYPE_BITS 5 #define __SWP_TYPE_MASK ((1UL << __SWP_TYPE_BITS) - 1) #define __SWP_OFFSET_SHIFT (__SWP_TYPE_BITS + __SWP_TYPE_SHIFT) @@ -744,11 +746,28 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #define __swp_type(x) (((x).val >> __SWP_TYPE_SHIFT) & __SWP_TYPE_MASK) #define __swp_offset(x) ((x).val >> __SWP_OFFSET_SHIFT) #define __swp_entry(type, offset) ((swp_entry_t) \ - { ((type) << __SWP_TYPE_SHIFT) | ((offset) << __SWP_OFFSET_SHIFT) }) + { (((type) & __SWP_TYPE_MASK) << __SWP_TYPE_SHIFT) | \ + ((offset) << __SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE); +} + #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) #define __swp_entry_to_pmd(swp) __pmd((swp).val) From patchwork Fri Jan 13 17:10:20 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43463 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp389504wrt; Fri, 13 Jan 2023 09:20:32 -0800 (PST) X-Google-Smtp-Source: AMrXdXtXDPN1p1nrwH77HP+JSuQ1q5DNp1kCoOZOe1i9DNldezX0Ag+yFMuF6OZXzCKFuWf/IuBw X-Received: by 2002:a05:6a20:8c18:b0:b6:9682:e9ac with SMTP id j24-20020a056a208c1800b000b69682e9acmr4353205pzh.31.1673630432081; Fri, 13 Jan 2023 09:20:32 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630432; cv=none; d=google.com; s=arc-20160816; b=KLmp9wQbJxFlfuFxSgmYSn94r+dxtQtgmJGrwH7YB7jo6uARKWsL9KEhK6B1lDAxDG Li9KVqdPbKTUCNDQc9yXafsfNP5eTCMNvqvNWhWr7RCiqwhnbfYQtIOgC3Vfo9YRwXHb IjibQ8azMpBjc/pJJl7P5NuoGWNBOiL1OHZlx6oBY4O1YwefDJwGpDPJipOP93lqq1rj 9fWfHgAnXzwIh055Ymjt+CpCoAr2+QusiYbzuaYEopWIPkZAqZUkws9g0beLrwSiUL1o 8BmMJVSS72taRoFWBmXxNHFuLjx/RT6a4xLHmzZRxrctbPY/uAeKbExOOXAuXE5IEJBA 4WPw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=iq3NJjdIXoIIFXuABXPEN69O+eZCmfZSMHyuPIjJQUs=; b=rir8qoK6dkMpNkwNq0uwyxRMNRx7VjLI3iZsqwb+X+AI5a7cQnP42GqyBKje6AsDp6 8qpUZ3mTK5FYkOfYr+dY1mO+Hclt3HKp00//HTkaj+MwR09SslT+9/2llM+AWhj7p6gd TXvy6TnsP1vYVlndAXMJhSiup0i4s89Mro7TzH7Pt2wn0bdGVYcuc0ZycWzCQp2V0jo/ FPBqX8ff9Ee4Gpl1Nw/Kwt0o8sgB3pJfgVxMiZ9Cw7RWh8VpqLSxtzaSs4qbZCTHYOxX sqErWa4a0U5M2ezFoTxnDTcrrJKYrUtgaJVARrIIgG8Or30RoiWQSRu86xqZhOVSXxfj C5Yw== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Ti3l7SbZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id jh19-20020a170903329300b00186c3afbd25si19357730plb.349.2023.01.13.09.20.14; Fri, 13 Jan 2023 09:20:32 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=Ti3l7SbZ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229925AbjAMRUH (ORCPT + 99 others); Fri, 13 Jan 2023 12:20:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55510 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229917AbjAMRTP (ORCPT ); Fri, 13 Jan 2023 12:19:15 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 32A2B9153F for ; Fri, 13 Jan 2023 09:13:16 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673629995; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=iq3NJjdIXoIIFXuABXPEN69O+eZCmfZSMHyuPIjJQUs=; b=Ti3l7SbZ/LUWbPAJWy2tP/clz523BpskDc2enHJ2DSYevqrMMtgBm1X53WJlw8udMG0taE m19dfG0bwjqEKAaEsQox1T2jvubDnFf7jJZYWmeT56Si622dfiOrP+TqW78q50fLpj1TeT dfD687pAGGna6Hlryrt7nn+AsDV8zTE= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-660-tcQ5phS1Ng-WmjPesDZNfg-1; Fri, 13 Jan 2023 12:13:10 -0500 X-MC-Unique: tcQ5phS1Ng-WmjPesDZNfg-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E6769100F902; Fri, 13 Jan 2023 17:13:08 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 8CFF640C2064; Fri, 13 Jan 2023 17:13:02 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Yoshinori Sato , Rich Felker Subject: [PATCH mm-unstable v1 20/26] sh/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:20 +0100 Message-Id: <20230113171026.582290-21-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928703673527876?= X-GMAIL-MSGID: =?utf-8?q?1754928703673527876?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using bit 6 in the PTE, reducing the swap type in the !CONFIG_X2TLB case to 5 bits. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit is effectively unused. Interrestingly, the swap type in the !CONFIG_X2TLB case could currently overlap with the _PAGE_PRESENT bit, because there is a sneaky shift by 1 in __pte_to_swp_entry() and __swp_entry_to_pte(). Bit 0-7 in the architecture specific swap PTE would get shifted to bit 1-8 in the PTE. As generic MM uses 5 bits only, this didn't matter so far. While at it, mask the type in __swp_entry(). Cc: Yoshinori Sato Cc: Rich Felker Signed-off-by: David Hildenbrand --- arch/sh/include/asm/pgtable_32.h | 54 +++++++++++++++++++++++++------- 1 file changed, 42 insertions(+), 12 deletions(-) diff --git a/arch/sh/include/asm/pgtable_32.h b/arch/sh/include/asm/pgtable_32.h index d0240decacca..c34aa795a9d2 100644 --- a/arch/sh/include/asm/pgtable_32.h +++ b/arch/sh/include/asm/pgtable_32.h @@ -423,40 +423,70 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #endif /* - * Encode and de-code a swap entry + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). * * Constraints: * _PAGE_PRESENT at bit 8 * _PAGE_PROTNONE at bit 9 * - * For the normal case, we encode the swap type into bits 0:7 and the - * swap offset into bits 10:30. For the 64-bit PTE case, we keep the - * preserved bits in the low 32-bits and use the upper 32 as the swap - * offset (along with a 5-bit type), following the same approach as x86 - * PAE. This keeps the logic quite simple. + * For the normal case, we encode the swap type and offset into the swap PTE + * such that bits 8 and 9 stay zero. For the 64-bit PTE case, we use the + * upper 32 for the swap offset and swap type, following the same approach as + * x86 PAE. This keeps the logic quite simple. * * As is evident by the Alpha code, if we ever get a 64-bit unsigned * long (swp_entry_t) to match up with the 64-bit PTEs, this all becomes * much cleaner.. - * - * NOTE: We should set ZEROs at the position of _PAGE_PRESENT - * and _PAGE_PROTNONE bits */ + #ifdef CONFIG_X2TLB +/* + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <--------------------- offset ----------------------> < type -> + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <------------------- zeroes --------------------> E 0 0 0 0 0 0 + */ #define __swp_type(x) ((x).val & 0x1f) #define __swp_offset(x) ((x).val >> 5) -#define __swp_entry(type, offset) ((swp_entry_t){ (type) | (offset) << 5}) +#define __swp_entry(type, offset) ((swp_entry_t){ ((type) & 0x1f) | (offset) << 5}) #define __pte_to_swp_entry(pte) ((swp_entry_t){ (pte).pte_high }) #define __swp_entry_to_pte(x) ((pte_t){ 0, (x).val }) #else -#define __swp_type(x) ((x).val & 0xff) +/* + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <--------------- offset ----------------> 0 0 0 0 E < type -> 0 + * + * E is the exclusive marker that is not stored in swap entries. + */ +#define __swp_type(x) ((x).val & 0x1f) #define __swp_offset(x) ((x).val >> 10) -#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) <<10}) +#define __swp_entry(type, offset) ((swp_entry_t){((type) & 0x1f) | (offset) << 10}) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 1 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 1 }) #endif +/* In both cases, we borrow bit 6 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_USER + +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte.pte_low & _PAGE_SWP_EXCLUSIVE; +} + +PTE_BIT_FUNC(low, swp_mkexclusive, |= _PAGE_SWP_EXCLUSIVE); +PTE_BIT_FUNC(low, swp_clear_exclusive, &= ~_PAGE_SWP_EXCLUSIVE); + #endif /* __ASSEMBLY__ */ #endif /* __ASM_SH_PGTABLE_32_H */ From patchwork Fri Jan 13 17:10:21 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43464 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp389609wrt; Fri, 13 Jan 2023 09:20:46 -0800 (PST) X-Google-Smtp-Source: AMrXdXu+tiJQ0Weon+x4vzCCs4W7wqvszSxF+6Zowmd+pa5UdrmiUtRsV1mW3oAd+lrpLoFbjMvL X-Received: by 2002:a62:8244:0:b0:585:7a3f:8de8 with SMTP id w65-20020a628244000000b005857a3f8de8mr28662141pfd.23.1673630446620; Fri, 13 Jan 2023 09:20:46 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630446; cv=none; d=google.com; s=arc-20160816; b=sD9rUeifietifizHERWRyuPCN9CVMPvn6cOKUDsTa2IIzg9NxtN0mXON+CQMPnCTMT fxBRfyLuN5QaYFa4n5uzzLCj3FW/3fUnJ+S2Nyjahxm8Cq2cKBbA9jsjH3JxXlSwBkYT dxRV7M3HZ8RbVwB/pyWl/4jTCSZPaVZtMczGZS/7WoumzjDOKSrsskwPUyxw7Aw5sRRm bN0zdSSnnVkhocYy6ZzLChD514xdZJCocNbkK3G5iolY14h6X8Qv/REtzG9mzk5TrXCX yNEhhMvgQRGb8Wih/qNDKui0fpM5BzwN/GvRrTnmiGgQMp4BX77fg6Ecu9UvA2ct9WK5 eoJA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=u/qx8EisQ9cE7qGuacOvuCI0HccRFINdBBjLGJqKXis=; b=tptvJIAufoS7KV8WZK0xliWPFvqjLWp0w9q1+rkHzGcQLa0KITNr3EQ/OtlpX+YeCN A49TOrKWruCE7HYeXv7DlTT6lZpbf+6CbejluEDDIbXy2WoK7cd4a24yHAM/tDwsYvfx NoQWhtqzQOiAAmtqAdi9IrHjARTJHN/Lwj59UY1tPRT7x/mSemEJ4uWnQX+gqOy9Cx/o cDGAo9RdXgiKDQ3nEvQnXEeNbIGaluKXXVvtDvzBPqPvoxkChUinVWifY0/A8gpnaEAV ZQLLGZykbziNBuq216auaKpYK0JxiHRSWZpToUzHCH/xmZDtfNV4yVaINC3yeWtwATxu +P+w== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="cpm6K/rY"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. 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Miller" Subject: [PATCH mm-unstable v1 21/26] sparc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 32bit Date: Fri, 13 Jan 2023 18:10:21 +0100 Message-Id: <20230113171026.582290-22-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928719501629100?= X-GMAIL-MSGID: =?utf-8?q?1754928719501629100?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by reusing the SRMMU_DIRTY bit as that seems to be safe to reuse inside a swap PTE. This avoids having to steal one bit from the swap offset. While at it, relocate the swap PTE layout documentation and use the same style now used for most other archs. Note that the old documentation was wrong: we use 20 bit for the offset and the reserved bits were 8 instead of 7 bits in the ascii art. Cc: "David S. Miller" Signed-off-by: David Hildenbrand --- arch/sparc/include/asm/pgtable_32.h | 27 ++++++++++++++++++++++++++- arch/sparc/include/asm/pgtsrmmu.h | 14 +++----------- 2 files changed, 29 insertions(+), 12 deletions(-) diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index 5acc05b572e6..abf7a2601209 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -323,7 +323,16 @@ void srmmu_mapiorange(unsigned int bus, unsigned long xpa, unsigned long xva, unsigned int len); void srmmu_unmapiorange(unsigned long virt_addr, unsigned int len); -/* Encode and de-code a swap entry */ +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <-------------- offset ---------------> < type -> E 0 0 0 0 0 0 + */ static inline unsigned long __swp_type(swp_entry_t entry) { return (entry.val >> SRMMU_SWP_TYPE_SHIFT) & SRMMU_SWP_TYPE_MASK; @@ -344,6 +353,22 @@ static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & SRMMU_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return __pte(pte_val(pte) | SRMMU_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return __pte(pte_val(pte) & ~SRMMU_SWP_EXCLUSIVE); +} + static inline unsigned long __get_phys (unsigned long addr) { diff --git a/arch/sparc/include/asm/pgtsrmmu.h b/arch/sparc/include/asm/pgtsrmmu.h index 6067925972d9..18e68d43f036 100644 --- a/arch/sparc/include/asm/pgtsrmmu.h +++ b/arch/sparc/include/asm/pgtsrmmu.h @@ -53,21 +53,13 @@ #define SRMMU_CHG_MASK (0xffffff00 | SRMMU_REF | SRMMU_DIRTY) -/* SRMMU swap entry encoding - * - * We use 5 bits for the type and 19 for the offset. This gives us - * 32 swapfiles of 4GB each. Encoding looks like: - * - * oooooooooooooooooootttttRRRRRRRR - * fedcba9876543210fedcba9876543210 - * - * The bottom 7 bits are reserved for protection and status bits, especially - * PRESENT. - */ +/* SRMMU swap entry encoding */ #define SRMMU_SWP_TYPE_MASK 0x1f #define SRMMU_SWP_TYPE_SHIFT 7 #define SRMMU_SWP_OFF_MASK 0xfffff #define SRMMU_SWP_OFF_SHIFT (SRMMU_SWP_TYPE_SHIFT + 5) +/* We borrow bit 6 to store the exclusive marker in swap PTEs. */ +#define SRMMU_SWP_EXCLUSIVE SRMMU_DIRTY /* Some day I will implement true fine grained access bits for * user pages because the SRMMU gives us the capabilities to From patchwork Fri Jan 13 17:10:22 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43465 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp389821wrt; Fri, 13 Jan 2023 09:21:20 -0800 (PST) X-Google-Smtp-Source: AMrXdXubUrjQJxdQL39GmkpYZWg5dAsk6yrV1fyeCLPY2244/wG3o+H11UC/9cIW4PMHE+jVGAjV X-Received: by 2002:a17:902:a717:b0:18d:d954:5f24 with SMTP id w23-20020a170902a71700b0018dd9545f24mr82067468plq.6.1673630479805; Fri, 13 Jan 2023 09:21:19 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630479; cv=none; d=google.com; s=arc-20160816; b=xFDulIfzZ0mnxvBJgk0f1NyN+sgyX1kId7zQjcs/8owhSnxbFO8vJTYsYH+1m/RFxy sWQ7/MwTxmuerrMp0KoGVUN0xPf9QyvKQMSItd2hd4/P0dUUsVoYkVI0TPwxxLXK4hqb fJTrvcbQRXQwiF09a7jiceZx+XUsUS0cuR0G8VbPOsvtypjUr5jUnIW6bNpmoaVHuOSR RXjVhZ+fi7JutGTLZp9SUiL0W31Lb062WCzJiU3SXsZidrY0iBdU0AZ76Rlyll0+U+pI 7gg94HPc6nPTdJjbS5v9DVnhDbbSXvrUNlLdaZoqUWMC/Rw7Y57i9iExbYG7JBtS7sG9 KKQQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=xYT8YWEwytZoLPvVTbowZpmJH8UYNybNjQxfoh3yd80=; b=A3vog5demSNViNnS0xIqeeoGne0tfUSTmBHrcRWmI0G+bkRPw3lw9txWMhMholoM7S lFEWOOx5bd8wwAhuxfmdB6j2B0QKR9QM3fqazuMnZRecpcnQBifH2gDm48p00vEzhr++ mh2Y2Q0uhfb8hrp+7bs/ZACr+gNT6qRPsJidGPwM1zEdifQiBHTiXDR/cqxOvteRbB/e CR11zX+/jJ4kkYHBcwpvVKyV3IQYXgdrnCyxPegV4UyjkS/o5RLu1ZSIRHYauGnYeMUC lPORykYF/pBG7/YJ22QjtoZctmPbwwTNv1FU2WfYlHMdflGQeKDqlIIvvZpH90WzRZcy A5fA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=bScTTRh7; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. 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Miller" Subject: [PATCH mm-unstable v1 22/26] sparc/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE on 64bit Date: Fri, 13 Jan 2023 18:10:22 +0100 Message-Id: <20230113171026.582290-23-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928753822611017?= X-GMAIL-MSGID: =?utf-8?q?1754928753822611017?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by stealing one bit from the type. Generic MM currently only uses 5 bits for the type (MAX_SWAPFILES_SHIFT), so the stolen bit was effectively unused. While at it, mask the type in __swp_entry(). Cc: "David S. Miller" Signed-off-by: David Hildenbrand --- arch/sparc/include/asm/pgtable_64.h | 38 ++++++++++++++++++++++++++--- 1 file changed, 35 insertions(+), 3 deletions(-) diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index 3bc9736bddb1..a1658eebd036 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -187,6 +187,9 @@ bool kern_addr_valid(unsigned long addr); #define _PAGE_SZHUGE_4U _PAGE_SZ4MB_4U #define _PAGE_SZHUGE_4V _PAGE_SZ4MB_4V +/* We borrow bit 20 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _AC(0x0000000000100000, UL) + #ifndef __ASSEMBLY__ pte_t mk_pte_io(unsigned long, pgprot_t, int, unsigned long); @@ -961,18 +964,47 @@ void pgtable_trans_huge_deposit(struct mm_struct *mm, pmd_t *pmdp, pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); #endif -/* Encode and de-code a swap entry */ -#define __swp_type(entry) (((entry).val >> PAGE_SHIFT) & 0xffUL) +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * <--------------------------- offset --------------------------- + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * --------------------> E <-- type ---> <------- zeroes --------> + */ +#define __swp_type(entry) (((entry).val >> PAGE_SHIFT) & 0x7fUL) #define __swp_offset(entry) ((entry).val >> (PAGE_SHIFT + 8UL)) #define __swp_entry(type, offset) \ ( (swp_entry_t) \ { \ - (((long)(type) << PAGE_SHIFT) | \ + ((((long)(type) & 0x7fUL) << PAGE_SHIFT) | \ ((long)(offset) << (PAGE_SHIFT + 8UL))) \ } ) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + return __pte(pte_val(pte) | _PAGE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + return __pte(pte_val(pte) & ~_PAGE_SWP_EXCLUSIVE); +} + int page_in_phys_avail(unsigned long paddr); /* From patchwork Fri Jan 13 17:10:23 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43466 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp391331wrt; Fri, 13 Jan 2023 09:24:43 -0800 (PST) X-Google-Smtp-Source: AMrXdXuigjduPA7IsTSxeKf/HYOEW46uO//YBo2MdRVswuOgg2CXRGiLt9+Z28G9oxWtmBnREsS9 X-Received: by 2002:a17:907:8b17:b0:7c1:8ba6:6eaf with SMTP id sz23-20020a1709078b1700b007c18ba66eafmr74446595ejc.5.1673630683500; Fri, 13 Jan 2023 09:24:43 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630683; cv=none; d=google.com; s=arc-20160816; b=ncTIFSH4KQterPj+ViJXIG3nfajOwk4NU918TP8TYFn0Fm+2loc8IWqR2zImkbkfK6 EW1NxSfhGvoCm6dc3z7vTcEyqyxTSSapKn+ilR5c80up+49q0GrfGzaCAPi3d/G6siKW w6OpfO4VXnefSlXIrb/9tYbeZMS15Tnftoao5dGkesA3fVeM1nLmQ9+rjDXIglaJE6Un LF1AViVJEyIpwfWW5Ur366jYrfwprsLDwrAYa2jvrLArOqAnw7blnXuuJ8KduWVKMqFT 7hrzlLDdEc+x/SdhcLsLFvkkmUcPCBAB9OYt6yjXqZRXO0zaFTxGZ3fkNt0edJxkL/gf atjQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=UAWcST9nT133bZRxHkPhgB7f9R452T7ovMnNe/O4IaQ=; b=txV4LiNU8NMIXBtlNaRsD+0gItX9nhhmnY0tiQXRVuj/JV7qFfv3Jq+DF9I6w9EdYs HYgmRuvLEmEi5HE2NLtHZTX1Ox0kqzW2PW0Fqx/Zef7AhORj0lUv7qHY3g2meo1MWDGU d9JUWoU3+BBPCsBwXRDc7TcCeZKvfH4lwDAksV5Szas/lARvzW2m0yZNJPGv6x6IcWSJ MLz5VV+uQAvR+HwX8LN/H5E536piVU2+/zLzXdEpjsTjG3yepsBLKE/1GBH7li8UVPoC 2hLSQj3ewQz7hD6FPq3DEnEQP1cwPtk5tCKwZHlrjYbyxuQqe0B+jQjXUclVlvrFgGnS JkzA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="HJ5C/rCK"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id hr15-20020a1709073f8f00b008699e402620si3785318ejc.518.2023.01.13.09.24.19; Fri, 13 Jan 2023 09:24:43 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b="HJ5C/rCK"; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230514AbjAMRVI (ORCPT + 99 others); Fri, 13 Jan 2023 12:21:08 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:34742 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230293AbjAMRU1 (ORCPT ); Fri, 13 Jan 2023 12:20:27 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E10859422D for ; Fri, 13 Jan 2023 09:13:35 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673630015; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=UAWcST9nT133bZRxHkPhgB7f9R452T7ovMnNe/O4IaQ=; b=HJ5C/rCKThSE2lmoEg20hwpqD1edKevS8fRTYFP+gn4JsVYg7adSw//eavlikVKb0zGy/1 hYOLrx3TCEumNLntxo0QC8LR/yyHBYBqdi6f04EYlLB8aJ5OdoGGCGQPaXBcDqcU8ksh0b Ek2wgqfosLGADeN/VlrxxaVvJ2LKxyQ= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-493-jMJtEjLQNTeXWTaNoMr99w-1; Fri, 13 Jan 2023 12:13:31 -0500 X-MC-Unique: jMJtEjLQNTeXWTaNoMr99w-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id E37231C05136; Fri, 13 Jan 2023 17:13:29 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 95D1E40C2064; Fri, 13 Jan 2023 17:13:23 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Richard Weinberger , Anton Ivanov , Johannes Berg Subject: [PATCH mm-unstable v1 23/26] um/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:23 +0100 Message-Id: <20230113171026.582290-24-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928967327101377?= X-GMAIL-MSGID: =?utf-8?q?1754928967327101377?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using bit 10, which is yet unused for swap PTEs. The pte_mkuptodate() is a bit weird in __pte_to_swp_entry() for a swap PTE ... but it only messes with bit 1 and 2 and there is a comment in set_pte(), so leave these bits alone. While at it, mask the type in __swp_entry(). Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Signed-off-by: David Hildenbrand --- arch/um/include/asm/pgtable.h | 37 +++++++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h index 4e3052f2671a..cedc5fd451ce 100644 --- a/arch/um/include/asm/pgtable.h +++ b/arch/um/include/asm/pgtable.h @@ -21,6 +21,9 @@ #define _PAGE_PROTNONE 0x010 /* if the user mapped it with PROT_NONE; pte_present gives true */ +/* We borrow bit 10 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE 0x400 + #ifdef CONFIG_3_LEVEL_PGTABLES #include #else @@ -288,16 +291,46 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); #define update_mmu_cache(vma,address,ptep) do {} while (0) -/* Encode and de-code a swap entry */ +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <--------------- offset ----------------> E < type -> 0 0 0 1 0 + * + * E is the exclusive marker that is not stored in swap entries. + * _PAGE_NEWPAGE (bit 1) is always set to 1 in set_pte(). + */ #define __swp_type(x) (((x).val >> 5) & 0x1f) #define __swp_offset(x) ((x).val >> 11) #define __swp_entry(type, offset) \ - ((swp_entry_t) { ((type) << 5) | ((offset) << 11) }) + ((swp_entry_t) { (((type) & 0x1f) << 5) | ((offset) << 11) }) #define __pte_to_swp_entry(pte) \ ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE); +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_set_bits(pte, _PAGE_SWP_EXCLUSIVE); + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_clear_bits(pte, _PAGE_SWP_EXCLUSIVE); + return pte; +} + /* Clear a kernel PTE and flush it from the TLB */ #define kpte_clear_flush(ptep, vaddr) \ do { \ From patchwork Fri Jan 13 17:10:24 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43469 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp391607wrt; Fri, 13 Jan 2023 09:25:19 -0800 (PST) X-Google-Smtp-Source: AMrXdXughQ3R5k1ttuTavcXkvJb802y5z++1a0OXA7yuOt7TLDns2B7vi+rw3QKAy5rER+rXBA7X X-Received: by 2002:a17:907:8a24:b0:846:95f9:5b4d with SMTP id sc36-20020a1709078a2400b0084695f95b4dmr90903825ejc.42.1673630719738; Fri, 13 Jan 2023 09:25:19 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630719; cv=none; d=google.com; s=arc-20160816; b=hox2KgWdF1CW/kerl78/MSEKWx73Jh/+HyBZH4OOJqAHCwnifL6IJL3QUo4n9Tt0cN f3aCrmz415y4ihuSOs5Z4yvDvVDVNFmQszP3NNuYxv0bDlIfak2hmcDuo6KN5MSaqErb Jq5H0rJX0aahy05xAUhVWAiTGBj+LJS7aSJiTO6kfr/8EZU/bnlmZAniJw4einKY5qmY Xw0taIcLNtEV4sl5Vz0GdItxTulu6+XcRT57lWz/VfuX3qTGhtiQtiV6v/0xRVMFBIQ9 zsrLUyOpRxT41FBgH+rCdOGZupUNUCK5zLyuAWXXKSt6HObUMjV8vBWzlzjno0RSE3uD 46jg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=Qm5QoVPm0Ej7LSZYB6DDk7xidLBDUjryz2WuGbnlcmU=; b=EI3g8Cc1ViQKTFltQjfpu/6zSvoeFbaFZT1MNTkaZuYRyQLZBJGKrswE7Gwo/sTB49 ozf6fmAckR2Ihrhf+QszbrpJjymn5oJe5wkUBBPvDyoi3NphNpWsnpDooloinI/SXQ2m e3l60/20Ve2F3eRcG64yiURZ9t3h2jbunfrURb2voTqdr9yJiDkEvdY4sl5ziTt/5a0u x5ww/G9dPhsPby7ihRaEXSAlcCUSfJRdgChtNUZinzXpw2ILcC3Wio1eJI2c5Iblr5Jl Mju78ZnGbnEu1+zc1/YbMLfRSPouhIXO/gRRGKhZTsUtT/Y2c1tsQrgAIK+h+TXXNcw7 GkXA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=D6RTbuuL; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. 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Peter Anvin" Subject: [PATCH mm-unstable v1 24/26] x86/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE also on 32bit Date: Fri, 13 Jan 2023 18:10:24 +0100 Message-Id: <20230113171026.582290-25-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754929005755994987?= X-GMAIL-MSGID: =?utf-8?q?1754929005755994987?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE just like we already do on x86-64. After deciphering the PTE layout it becomes clear that there are still unused bits for 2-level and 3-level page tables that we should be able to use. Reusing a bit avoids stealing one bit from the swap offset. While at it, mask the type in __swp_entry(); use some helper definitions to make the macros easier to grasp. Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Signed-off-by: David Hildenbrand --- arch/x86/include/asm/pgtable-2level.h | 26 +++++++++++++++++++++----- arch/x86/include/asm/pgtable-3level.h | 26 +++++++++++++++++++++++--- arch/x86/include/asm/pgtable.h | 2 -- 3 files changed, 44 insertions(+), 10 deletions(-) diff --git a/arch/x86/include/asm/pgtable-2level.h b/arch/x86/include/asm/pgtable-2level.h index 60d0f9015317..e9482a11ac52 100644 --- a/arch/x86/include/asm/pgtable-2level.h +++ b/arch/x86/include/asm/pgtable-2level.h @@ -80,21 +80,37 @@ static inline unsigned long pte_bitop(unsigned long value, unsigned int rightshi return ((value >> rightshift) & mask) << leftshift; } -/* Encode and de-code a swap entry */ +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * <----------------- offset ------------------> 0 E <- type --> 0 + * + * E is the exclusive marker that is not stored in swap entries. + */ #define SWP_TYPE_BITS 5 +#define _SWP_TYPE_MASK ((1U << SWP_TYPE_BITS) - 1) +#define _SWP_TYPE_SHIFT (_PAGE_BIT_PRESENT + 1) #define SWP_OFFSET_SHIFT (_PAGE_BIT_PROTNONE + 1) -#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) +#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5) -#define __swp_type(x) (((x).val >> (_PAGE_BIT_PRESENT + 1)) \ - & ((1U << SWP_TYPE_BITS) - 1)) +#define __swp_type(x) (((x).val >> _SWP_TYPE_SHIFT) \ + & _SWP_TYPE_MASK) #define __swp_offset(x) ((x).val >> SWP_OFFSET_SHIFT) #define __swp_entry(type, offset) ((swp_entry_t) { \ - ((type) << (_PAGE_BIT_PRESENT + 1)) \ + (((type) & _SWP_TYPE_MASK) << _SWP_TYPE_SHIFT) \ | ((offset) << SWP_OFFSET_SHIFT) }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { (pte).pte_low }) #define __swp_entry_to_pte(x) ((pte_t) { .pte = (x).val }) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_PSE + /* No inverted PFNs on 2 level page tables */ static inline u64 protnone_mask(u64 val) diff --git a/arch/x86/include/asm/pgtable-3level.h b/arch/x86/include/asm/pgtable-3level.h index 967b135fa2c0..9e7c0b719c3c 100644 --- a/arch/x86/include/asm/pgtable-3level.h +++ b/arch/x86/include/asm/pgtable-3level.h @@ -145,8 +145,24 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, } #endif -/* Encode and de-code a swap entry */ +/* + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). + * + * Format of swap PTEs: + * + * 6 6 6 6 5 5 5 5 5 5 5 5 5 5 4 4 4 4 4 4 4 4 4 4 3 3 3 3 3 3 3 3 + * 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 + * < type -> <---------------------- offset ---------------------- + * + * 3 3 2 2 2 2 2 2 2 2 2 2 1 1 1 1 1 1 1 1 1 1 + * 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 9 8 7 6 5 4 3 2 1 0 + * --------------------------------------------> 0 E 0 0 0 0 0 0 0 + * + * E is the exclusive marker that is not stored in swap entries. + */ #define SWP_TYPE_BITS 5 +#define _SWP_TYPE_MASK ((1U << SWP_TYPE_BITS) - 1) #define SWP_OFFSET_FIRST_BIT (_PAGE_BIT_PROTNONE + 1) @@ -154,9 +170,10 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #define SWP_OFFSET_SHIFT (SWP_OFFSET_FIRST_BIT + SWP_TYPE_BITS) #define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) -#define __swp_type(x) (((x).val) & ((1UL << SWP_TYPE_BITS) - 1)) +#define __swp_type(x) (((x).val) & _SWP_TYPE_MASK) #define __swp_offset(x) ((x).val >> SWP_TYPE_BITS) -#define __swp_entry(type, offset) ((swp_entry_t){(type) | (offset) << SWP_TYPE_BITS}) +#define __swp_entry(type, offset) ((swp_entry_t){((type) & _SWP_TYPE_MASK) \ + | (offset) << SWP_TYPE_BITS}) /* * Normally, __swp_entry() converts from arch-independent swp_entry_t to @@ -184,6 +201,9 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) (__swp_entry(__pteval_swp_type(pte), \ __pteval_swp_offset(pte))) +/* We borrow bit 7 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE _PAGE_PSE + #include #endif /* _ASM_X86_PGTABLE_3LEVEL_H */ diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index 1c843395a8b3..d25195726b78 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1299,7 +1299,6 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma, unsigned long addr, pud_t *pud) { } -#ifdef _PAGE_SWP_EXCLUSIVE #define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline pte_t pte_swp_mkexclusive(pte_t pte) { @@ -1315,7 +1314,6 @@ static inline pte_t pte_swp_clear_exclusive(pte_t pte) { return pte_clear_flags(pte, _PAGE_SWP_EXCLUSIVE); } -#endif /* _PAGE_SWP_EXCLUSIVE */ #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY static inline pte_t pte_swp_mksoft_dirty(pte_t pte) From patchwork Fri Jan 13 17:10:25 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43467 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp391558wrt; Fri, 13 Jan 2023 09:25:13 -0800 (PST) X-Google-Smtp-Source: AMrXdXtJODMb7PfdInuFS5mWaDl1pYcwknhtviBII+rKdEivXj4a56XXYkH6FwqwOUbu4x6Qm7pm X-Received: by 2002:a17:906:1414:b0:78d:f455:b5dd with SMTP id p20-20020a170906141400b0078df455b5ddmr64131880ejc.29.1673630713608; Fri, 13 Jan 2023 09:25:13 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630713; cv=none; d=google.com; s=arc-20160816; b=gIn7oNFlwqbjEh7FeIeXgaqYAXXus0kZueL/TkshuUeUzs4aMVUK32VazYJlmXkrhk Rh5Wadmwc0pngjcaH67N+eeQFaJ1/Y5RfkyPYvL2g0dVZUr3Ug89R5IIZXctBWZZxAoB 1fANDOvqf04B3gOoWBXANs/EcOXmKfVKlsm01vT2aYs2135XJGgj+iXqVmWI4vPM10EJ qJnHWAWHC+fWA9K+sGxvRCrQxVwJTZjh6515RdMs593asbvfXJ5i6G9bdMS4Am62kYnQ NtxGSLk7NONCEZpFCAupbiDEEK4ytipyKHQ+TPlyVMY10bYo8bZxmAgZVUqi5f81EmnW ytAw== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=bmpIeZUQPW93vOhFIi7U44xqWezjAAUM6rotNAYg4/I=; b=ksgkoOlezCuNnzzF2XxkIc1oAhuujU9kY/SQ2jQmL6OB26RABtDJtesCL6aDu/dOR3 a0Qc1UYtISVmHXdXwM87SztqNrlHnkRyvOQ0e4c+KsaUnchgnUjtBwKklWX73Wl4/PFS mXVXtSgTKeIiOEz9IlNmMbxUhYft6wv2AxjtMDrvBZv9nI0p9T+gcoKdVrfPxbjNB7MU 0DSkuSpbhn7oF0v3qHYBhl0btnFhsdXhddAIzgi7AsZdcRybx89Konb86L1N4edbW+h1 KR62IpBrBLPZse0hJ5xk6YxIVUtcHCfxsgN1Xt7zzKHYVQOaHHvv0YSRgFOgjef3cbbg rpVA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=AeyWqODg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id hq16-20020a1709073f1000b007c10ac7fe46si23974088ejc.19.2023.01.13.09.24.48; Fri, 13 Jan 2023 09:25:13 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=AeyWqODg; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231124AbjAMRVh (ORCPT + 99 others); Fri, 13 Jan 2023 12:21:37 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33374 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230394AbjAMRUw (ORCPT ); Fri, 13 Jan 2023 12:20:52 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D40FD96755 for ; Fri, 13 Jan 2023 09:13:52 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673630032; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=bmpIeZUQPW93vOhFIi7U44xqWezjAAUM6rotNAYg4/I=; b=AeyWqODg035oALHIOboHrQXuFtfOzxTQ6urR202SsHxi//YUT2rcAVfsN16/vfkooRIk6+ UuHPL5xy2urLA6J3yKYDBZYeMGKTKyKpWFYw1aZDpfkskAVy9wN/9jpX7vC10y/NThj98J ue13KkEYJQ1N+R+OytcYwu5WM/bHrxU= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-221-_4owQC4lN0aWG8hTOfvPjQ-1; Fri, 13 Jan 2023 12:13:46 -0500 X-MC-Unique: _4owQC4lN0aWG8hTOfvPjQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 427DA101A52E; Fri, 13 Jan 2023 17:13:45 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id E323740C2064; Fri, 13 Jan 2023 17:13:37 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand , Chris Zankel , Max Filippov Subject: [PATCH mm-unstable v1 25/26] xtensa/mm: support __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:25 +0100 Message-Id: <20230113171026.582290-26-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754928999193554612?= X-GMAIL-MSGID: =?utf-8?q?1754928999193554612?= Let's support __HAVE_ARCH_PTE_SWP_EXCLUSIVE by using bit 1. This bit should be safe to use for our usecase. Most importantly, we can still distinguish swap PTEs from PAGE_NONE PTEs (see pte_present()) and don't use one of the two reserved attribute masks (1101 and 1111). Attribute mask 1100 and 1110 now identify swap PTEs. While at it, remove SWP_TYPE_BITS (not really helpful as it's not used in the actual swap macros) and mask the type in __swp_entry(). Cc: Chris Zankel Cc: Max Filippov Signed-off-by: David Hildenbrand --- arch/xtensa/include/asm/pgtable.h | 32 ++++++++++++++++++++++++++----- 1 file changed, 27 insertions(+), 5 deletions(-) diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h index 5b5484d707b2..1025e2dc292b 100644 --- a/arch/xtensa/include/asm/pgtable.h +++ b/arch/xtensa/include/asm/pgtable.h @@ -96,7 +96,7 @@ * +- - - - - - - - - - - - - - - - - - - - -+ * (PAGE_NONE)| PPN | 0 | 00 | ADW | 01 | 11 | 11 | * +-----------------------------------------+ - * swap | index | type | 01 | 11 | 00 | + * swap | index | type | 01 | 11 | e0 | * +-----------------------------------------+ * * For T1050 hardware and earlier the layout differs for present and (PAGE_NONE) @@ -112,6 +112,7 @@ * RI ring (0=privileged, 1=user, 2 and 3 are unused) * CA cache attribute: 00 bypass, 01 writeback, 10 writethrough * (11 is invalid and used to mark pages that are not present) + * e exclusive marker in swap PTEs * w page is writable (hw) * x page is executable (hw) * index swap offset / PAGE_SIZE (bit 11-31: 21 bits -> 8 GB) @@ -158,6 +159,9 @@ #define _PAGE_DIRTY (1<<7) /* software: page dirty */ #define _PAGE_ACCESSED (1<<8) /* software: page accessed (read) */ +/* We borrow bit 1 to store the exclusive marker in swap PTEs. */ +#define _PAGE_SWP_EXCLUSIVE (1<<1) + #ifdef CONFIG_MMU #define _PAGE_CHG_MASK (PAGE_MASK | _PAGE_ACCESSED | _PAGE_DIRTY) @@ -343,19 +347,37 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) } /* - * Encode and decode a swap and file entry. + * Encode/decode swap entries and swap PTEs. Swap PTEs are all PTEs that + * are !pte_none() && !pte_present(). */ -#define SWP_TYPE_BITS 5 -#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > SWP_TYPE_BITS) +#define MAX_SWAPFILES_CHECK() BUILD_BUG_ON(MAX_SWAPFILES_SHIFT > 5) #define __swp_type(entry) (((entry).val >> 6) & 0x1f) #define __swp_offset(entry) ((entry).val >> 11) #define __swp_entry(type,offs) \ - ((swp_entry_t){((type) << 6) | ((offs) << 11) | \ + ((swp_entry_t){(((type) & 0x1f) << 6) | ((offs) << 11) | \ _PAGE_CA_INVALID | _PAGE_USER}) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) +#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE +static inline int pte_swp_exclusive(pte_t pte) +{ + return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; +} + +static inline pte_t pte_swp_mkexclusive(pte_t pte) +{ + pte_val(pte) |= _PAGE_SWP_EXCLUSIVE; + return pte; +} + +static inline pte_t pte_swp_clear_exclusive(pte_t pte) +{ + pte_val(pte) &= ~_PAGE_SWP_EXCLUSIVE; + return pte; +} + #endif /* !defined (__ASSEMBLY__) */ From patchwork Fri Jan 13 17:10:26 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: David Hildenbrand X-Patchwork-Id: 43468 Return-Path: Delivered-To: ouuuleilei@gmail.com Received: by 2002:a5d:4e01:0:0:0:0:0 with SMTP id p1csp391568wrt; Fri, 13 Jan 2023 09:25:14 -0800 (PST) X-Google-Smtp-Source: AMrXdXtbbgU1XmPB56OKTzNYtVwX3ub522m0PuOORBND8uo1BKraIbY7W5i+mkJuyf3W3UaqUjim X-Received: by 2002:a05:6402:547:b0:499:bec8:4d with SMTP id i7-20020a056402054700b00499bec8004dmr416132edx.32.1673630714587; Fri, 13 Jan 2023 09:25:14 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1673630714; cv=none; d=google.com; s=arc-20160816; b=O4jBOufvKMeaXTYwRn3M1her09CMRj8O1XnOM5BOr3S1XQ+QE7CMbScU4zH/KLQee1 kzYmgROm0t/HhLmmuJOOw5j4QCIMKuZiqgJ2Ritmg7c2Xh/oN4zROK+7lA4l3Tw888Nr mc5KM3Erp3NeyaBbOifD8z12kfBuiuFxRoR7loBoAdIAP5N3FIH5Kd6DWTkY0qOfOpH8 ktybB9YR3JCs3iW6TYwQtLv6h7Fa1bAkqkbDC+leBFHOeh/h+thoZQQopjgBrxhipgFi 0ntbigIeluTngfw++vFUUoEtZq9sI6t5/+LlahqDyxty/sYYvY2WOlMCAvJ4A8fTxnaq ebjg== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:content-transfer-encoding:mime-version :references:in-reply-to:message-id:date:subject:cc:to:from :dkim-signature; bh=+mP3IZE/KZDl9GAJezYjg0rs6pyEF4+VKT2OjTSckLY=; b=rcOEQ7AEKfDl3QQkwwM5xjv2MxB/z98l0DGQNrkPlMJb61reGBk17K7PNvzj4Me5JL 6moDwJKu/SobgfVcIbkPDqAEq6bJoNRU8S3P32hfBY7ccc0bcxCWHcYAaoJDIDtAHj65 0UalwPHizM4bKsuK84++NCjlHholzuu18FfD+WYJ/a7DzUN+0m9DrMyXx8c6Je7lq25F etIxDm0stB+bF71hqrgQZJdDJ+G6pr6o6wDC4avovzxATeOsdHq1Yqe6b6gMiT0BsSgy HQF3WRM8K87Ci6wVgqI90c2KZwwWqDNiyHImGtM6Cgo3QGDCkOYNy4OQYXYDS5lpuUwl Y81Q== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=C4SMgn0W; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: from out1.vger.email (out1.vger.email. [2620:137:e000::1:20]) by mx.google.com with ESMTP id sh31-20020a1709076e9f00b0086c6709b8c6si212270ejc.199.2023.01.13.09.24.50; Fri, 13 Jan 2023 09:25:14 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; dkim=pass header.i=@redhat.com header.s=mimecast20190719 header.b=C4SMgn0W; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=redhat.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230498AbjAMRWA (ORCPT + 99 others); Fri, 13 Jan 2023 12:22:00 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:33650 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230483AbjAMRVR (ORCPT ); Fri, 13 Jan 2023 12:21:17 -0500 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 2E7E93D1D9 for ; Fri, 13 Jan 2023 09:13:55 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1673630034; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=+mP3IZE/KZDl9GAJezYjg0rs6pyEF4+VKT2OjTSckLY=; b=C4SMgn0WC5Tu0+fFdneBHhM4qs3xNVwHdBkRBLisFJ116o/+aBitcqAoiVxpFFsulxfKx0 kDnK3bRS0jUp5bk1GTXNYpZMl/bJMVIqm4Y1MRZrCPamYpvTgRC/pg2nRXVGgOjl1RLB+e Uis8XRiCTnTgxG7j/MM6OA4v2NurN30= Received: from mimecast-mx02.redhat.com (mimecast-mx02.redhat.com [66.187.233.88]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-228-yJ_xIwaqOwyPhpGEXK3vQQ-1; Fri, 13 Jan 2023 12:13:53 -0500 X-MC-Unique: yJ_xIwaqOwyPhpGEXK3vQQ-1 Received: from smtp.corp.redhat.com (int-mx01.intmail.prod.int.rdu2.redhat.com [10.11.54.1]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id 169B0887400; Fri, 13 Jan 2023 17:13:52 +0000 (UTC) Received: from t480s.fritz.box (unknown [10.39.193.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id 9979F40C2004; Fri, 13 Jan 2023 17:13:45 +0000 (UTC) From: David Hildenbrand To: linux-kernel@vger.kernel.org Cc: Andrew Morton , Hugh Dickins , John Hubbard , Jason Gunthorpe , Mike Rapoport , Yang Shi , Vlastimil Babka , Nadav Amit , Andrea Arcangeli , Peter Xu , linux-mm@kvack.org, x86@kernel.org, linux-alpha@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-um@lists.infradead.org, linux-xtensa@linux-xtensa.org, David Hildenbrand Subject: [PATCH mm-unstable v1 26/26] mm: remove __HAVE_ARCH_PTE_SWP_EXCLUSIVE Date: Fri, 13 Jan 2023 18:10:26 +0100 Message-Id: <20230113171026.582290-27-david@redhat.com> In-Reply-To: <20230113171026.582290-1-david@redhat.com> References: <20230113171026.582290-1-david@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.1 X-Spam-Status: No, score=-2.1 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H2,SPF_HELO_NONE,SPF_NONE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1754929000114225112?= X-GMAIL-MSGID: =?utf-8?q?1754929000114225112?= __HAVE_ARCH_PTE_SWP_EXCLUSIVE is now supported by all architectures that support swp PTEs, so let's drop it. Signed-off-by: David Hildenbrand --- arch/alpha/include/asm/pgtable.h | 1 - arch/arc/include/asm/pgtable-bits-arcv2.h | 1 - arch/arm/include/asm/pgtable.h | 1 - arch/arm64/include/asm/pgtable.h | 1 - arch/csky/include/asm/pgtable.h | 1 - arch/hexagon/include/asm/pgtable.h | 1 - arch/ia64/include/asm/pgtable.h | 1 - arch/loongarch/include/asm/pgtable.h | 1 - arch/m68k/include/asm/mcf_pgtable.h | 1 - arch/m68k/include/asm/motorola_pgtable.h | 1 - arch/m68k/include/asm/sun3_pgtable.h | 1 - arch/microblaze/include/asm/pgtable.h | 1 - arch/mips/include/asm/pgtable.h | 1 - arch/nios2/include/asm/pgtable.h | 1 - arch/openrisc/include/asm/pgtable.h | 1 - arch/parisc/include/asm/pgtable.h | 1 - arch/powerpc/include/asm/book3s/32/pgtable.h | 1 - arch/powerpc/include/asm/book3s/64/pgtable.h | 1 - arch/powerpc/include/asm/nohash/pgtable.h | 1 - arch/riscv/include/asm/pgtable.h | 1 - arch/s390/include/asm/pgtable.h | 1 - arch/sh/include/asm/pgtable_32.h | 1 - arch/sparc/include/asm/pgtable_32.h | 1 - arch/sparc/include/asm/pgtable_64.h | 1 - arch/um/include/asm/pgtable.h | 1 - arch/x86/include/asm/pgtable.h | 1 - arch/xtensa/include/asm/pgtable.h | 1 - include/linux/pgtable.h | 29 -------------------- mm/debug_vm_pgtable.c | 2 -- mm/memory.c | 4 --- mm/rmap.c | 11 -------- 31 files changed, 73 deletions(-) diff --git a/arch/alpha/include/asm/pgtable.h b/arch/alpha/include/asm/pgtable.h index 970abf511b13..ba43cb841d19 100644 --- a/arch/alpha/include/asm/pgtable.h +++ b/arch/alpha/include/asm/pgtable.h @@ -328,7 +328,6 @@ extern inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/arc/include/asm/pgtable-bits-arcv2.h b/arch/arc/include/asm/pgtable-bits-arcv2.h index 611f412713b9..6e9f8ca6d6a1 100644 --- a/arch/arc/include/asm/pgtable-bits-arcv2.h +++ b/arch/arc/include/asm/pgtable-bits-arcv2.h @@ -132,7 +132,6 @@ void update_mmu_cache(struct vm_area_struct *vma, unsigned long address, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/arm/include/asm/pgtable.h b/arch/arm/include/asm/pgtable.h index 886c275995a2..2e626e6da9a3 100644 --- a/arch/arm/include/asm/pgtable.h +++ b/arch/arm/include/asm/pgtable.h @@ -298,7 +298,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(swp) __pte((swp).val) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_isset(pte, L_PTE_SWP_EXCLUSIVE); diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h index b4bbeed80fb6..e0c19f5e3413 100644 --- a/arch/arm64/include/asm/pgtable.h +++ b/arch/arm64/include/asm/pgtable.h @@ -417,7 +417,6 @@ static inline pgprot_t mk_pmd_sect_prot(pgprot_t prot) return __pgprot((pgprot_val(prot) & ~PMD_TABLE_BIT) | PMD_TYPE_SECT); } -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline pte_t pte_swp_mkexclusive(pte_t pte) { return set_pte_bit(pte, __pgprot(PTE_SWP_EXCLUSIVE)); diff --git a/arch/csky/include/asm/pgtable.h b/arch/csky/include/asm/pgtable.h index 574c97b9ecca..d4042495febc 100644 --- a/arch/csky/include/asm/pgtable.h +++ b/arch/csky/include/asm/pgtable.h @@ -200,7 +200,6 @@ static inline pte_t pte_mkyoung(pte_t pte) return pte; } -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/hexagon/include/asm/pgtable.h b/arch/hexagon/include/asm/pgtable.h index 7eb008e477c8..59393613d086 100644 --- a/arch/hexagon/include/asm/pgtable.h +++ b/arch/hexagon/include/asm/pgtable.h @@ -397,7 +397,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) (((type & 0x1f) << 1) | \ ((offset & 0x3ffff8) << 10) | ((offset & 0x7) << 7)) }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/ia64/include/asm/pgtable.h b/arch/ia64/include/asm/pgtable.h index e4b8ab931399..21c97e31a28a 100644 --- a/arch/ia64/include/asm/pgtable.h +++ b/arch/ia64/include/asm/pgtable.h @@ -424,7 +424,6 @@ extern void paging_init (void); #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/loongarch/include/asm/pgtable.h b/arch/loongarch/include/asm/pgtable.h index c6b8fe7ac43c..d28fb9dbec59 100644 --- a/arch/loongarch/include/asm/pgtable.h +++ b/arch/loongarch/include/asm/pgtable.h @@ -276,7 +276,6 @@ static inline pte_t mk_swap_pte(unsigned long type, unsigned long offset) #define __pmd_to_swp_entry(pmd) ((swp_entry_t) { pmd_val(pmd) }) #define __swp_entry_to_pmd(x) ((pmd_t) { (x).val | _PAGE_HUGE }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/m68k/include/asm/mcf_pgtable.h b/arch/m68k/include/asm/mcf_pgtable.h index e573d7b649f7..13741c1245e1 100644 --- a/arch/m68k/include/asm/mcf_pgtable.h +++ b/arch/m68k/include/asm/mcf_pgtable.h @@ -275,7 +275,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) (__pte((x).val)) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/m68k/include/asm/motorola_pgtable.h b/arch/m68k/include/asm/motorola_pgtable.h index c1782563e793..ec0dc19ab834 100644 --- a/arch/m68k/include/asm/motorola_pgtable.h +++ b/arch/m68k/include/asm/motorola_pgtable.h @@ -190,7 +190,6 @@ extern pgd_t kernel_pg_dir[128]; #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/m68k/include/asm/sun3_pgtable.h b/arch/m68k/include/asm/sun3_pgtable.h index dbfc9703b15d..e582b0484a55 100644 --- a/arch/m68k/include/asm/sun3_pgtable.h +++ b/arch/m68k/include/asm/sun3_pgtable.h @@ -174,7 +174,6 @@ extern pgd_t kernel_pg_dir[PTRS_PER_PGD]; #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/microblaze/include/asm/pgtable.h b/arch/microblaze/include/asm/pgtable.h index 7e3de54bf426..d1b8272abcd9 100644 --- a/arch/microblaze/include/asm/pgtable.h +++ b/arch/microblaze/include/asm/pgtable.h @@ -412,7 +412,6 @@ extern pgd_t swapper_pg_dir[PTRS_PER_PGD]; #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 2 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 2 }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/mips/include/asm/pgtable.h b/arch/mips/include/asm/pgtable.h index 711874cee8e4..791389bf3c12 100644 --- a/arch/mips/include/asm/pgtable.h +++ b/arch/mips/include/asm/pgtable.h @@ -528,7 +528,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) } #endif -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE #if defined(CONFIG_PHYS_ADDR_T_64BIT) && defined(CONFIG_CPU_MIPS32) static inline int pte_swp_exclusive(pte_t pte) { diff --git a/arch/nios2/include/asm/pgtable.h b/arch/nios2/include/asm/pgtable.h index 05999da01731..0f5c2564e9f5 100644 --- a/arch/nios2/include/asm/pgtable.h +++ b/arch/nios2/include/asm/pgtable.h @@ -253,7 +253,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) #define __swp_entry_to_pte(swp) ((pte_t) { (swp).val }) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/openrisc/include/asm/pgtable.h b/arch/openrisc/include/asm/pgtable.h index 903b32d662ab..3eb9b9555d0d 100644 --- a/arch/openrisc/include/asm/pgtable.h +++ b/arch/openrisc/include/asm/pgtable.h @@ -408,7 +408,6 @@ static inline void update_mmu_cache(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/parisc/include/asm/pgtable.h b/arch/parisc/include/asm/pgtable.h index 3033bb88df34..e2950f5db7c9 100644 --- a/arch/parisc/include/asm/pgtable.h +++ b/arch/parisc/include/asm/pgtable.h @@ -422,7 +422,6 @@ extern void paging_init (void); #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/powerpc/include/asm/book3s/32/pgtable.h b/arch/powerpc/include/asm/book3s/32/pgtable.h index 0ecb3a58f23f..7bf1fe7297c6 100644 --- a/arch/powerpc/include/asm/book3s/32/pgtable.h +++ b/arch/powerpc/include/asm/book3s/32/pgtable.h @@ -386,7 +386,6 @@ static inline void __ptep_set_access_flags(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) >> 3 }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val << 3 }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/powerpc/include/asm/book3s/64/pgtable.h b/arch/powerpc/include/asm/book3s/64/pgtable.h index cb4c67bf45d7..4acc9690f599 100644 --- a/arch/powerpc/include/asm/book3s/64/pgtable.h +++ b/arch/powerpc/include/asm/book3s/64/pgtable.h @@ -717,7 +717,6 @@ static inline pte_t pte_swp_clear_soft_dirty(pte_t pte) } #endif /* CONFIG_HAVE_ARCH_SOFT_DIRTY */ -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline pte_t pte_swp_mkexclusive(pte_t pte) { return __pte_raw(pte_raw(pte) | cpu_to_be64(_PAGE_SWP_EXCLUSIVE)); diff --git a/arch/powerpc/include/asm/nohash/pgtable.h b/arch/powerpc/include/asm/nohash/pgtable.h index 5f4620940c2c..a6caaaab6f92 100644 --- a/arch/powerpc/include/asm/nohash/pgtable.h +++ b/arch/powerpc/include/asm/nohash/pgtable.h @@ -151,7 +151,6 @@ static inline pte_t pte_modify(pte_t pte, pgprot_t newprot) return __pte((pte_val(pte) & _PAGE_CHG_MASK) | pgprot_val(newprot)); } -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/riscv/include/asm/pgtable.h b/arch/riscv/include/asm/pgtable.h index 03a4728db039..5b9f409a940d 100644 --- a/arch/riscv/include/asm/pgtable.h +++ b/arch/riscv/include/asm/pgtable.h @@ -752,7 +752,6 @@ static inline pmd_t pmdp_establish(struct vm_area_struct *vma, #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/s390/include/asm/pgtable.h b/arch/s390/include/asm/pgtable.h index b26cbf1c533c..2b5db99e31dd 100644 --- a/arch/s390/include/asm/pgtable.h +++ b/arch/s390/include/asm/pgtable.h @@ -812,7 +812,6 @@ static inline int pmd_protnone(pmd_t pmd) } #endif -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/sh/include/asm/pgtable_32.h b/arch/sh/include/asm/pgtable_32.h index c34aa795a9d2..21952b094650 100644 --- a/arch/sh/include/asm/pgtable_32.h +++ b/arch/sh/include/asm/pgtable_32.h @@ -479,7 +479,6 @@ static inline unsigned long pmd_page_vaddr(pmd_t pmd) /* In both cases, we borrow bit 6 to store the exclusive marker in swap PTEs. */ #define _PAGE_SWP_EXCLUSIVE _PAGE_USER -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte.pte_low & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/sparc/include/asm/pgtable_32.h b/arch/sparc/include/asm/pgtable_32.h index abf7a2601209..d4330e3c57a6 100644 --- a/arch/sparc/include/asm/pgtable_32.h +++ b/arch/sparc/include/asm/pgtable_32.h @@ -353,7 +353,6 @@ static inline swp_entry_t __swp_entry(unsigned long type, unsigned long offset) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & SRMMU_SWP_EXCLUSIVE; diff --git a/arch/sparc/include/asm/pgtable_64.h b/arch/sparc/include/asm/pgtable_64.h index a1658eebd036..2dc8d4641734 100644 --- a/arch/sparc/include/asm/pgtable_64.h +++ b/arch/sparc/include/asm/pgtable_64.h @@ -989,7 +989,6 @@ pgtable_t pgtable_trans_huge_withdraw(struct mm_struct *mm, pmd_t *pmdp); #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/arch/um/include/asm/pgtable.h b/arch/um/include/asm/pgtable.h index cedc5fd451ce..a70d1618eb35 100644 --- a/arch/um/include/asm/pgtable.h +++ b/arch/um/include/asm/pgtable.h @@ -313,7 +313,6 @@ extern pte_t *virt_to_pte(struct mm_struct *mm, unsigned long addr); ((swp_entry_t) { pte_val(pte_mkuptodate(pte)) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_get_bits(pte, _PAGE_SWP_EXCLUSIVE); diff --git a/arch/x86/include/asm/pgtable.h b/arch/x86/include/asm/pgtable.h index d25195726b78..7425f32e5293 100644 --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -1299,7 +1299,6 @@ static inline void update_mmu_cache_pud(struct vm_area_struct *vma, unsigned long addr, pud_t *pud) { } -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline pte_t pte_swp_mkexclusive(pte_t pte) { return pte_set_flags(pte, _PAGE_SWP_EXCLUSIVE); diff --git a/arch/xtensa/include/asm/pgtable.h b/arch/xtensa/include/asm/pgtable.h index 1025e2dc292b..fc7a14884c6c 100644 --- a/arch/xtensa/include/asm/pgtable.h +++ b/arch/xtensa/include/asm/pgtable.h @@ -360,7 +360,6 @@ ptep_set_wrprotect(struct mm_struct *mm, unsigned long addr, pte_t *ptep) #define __pte_to_swp_entry(pte) ((swp_entry_t) { pte_val(pte) }) #define __swp_entry_to_pte(x) ((pte_t) { (x).val }) -#define __HAVE_ARCH_PTE_SWP_EXCLUSIVE static inline int pte_swp_exclusive(pte_t pte) { return pte_val(pte) & _PAGE_SWP_EXCLUSIVE; diff --git a/include/linux/pgtable.h b/include/linux/pgtable.h index 1159b25b0542..5fd45454c073 100644 --- a/include/linux/pgtable.h +++ b/include/linux/pgtable.h @@ -1064,35 +1064,6 @@ static inline pgprot_t pgprot_modify(pgprot_t oldprot, pgprot_t newprot) #define arch_start_context_switch(prev) do {} while (0) #endif -/* - * When replacing an anonymous page by a real (!non) swap entry, we clear - * PG_anon_exclusive from the page and instead remember whether the flag was - * set in the swp pte. During fork(), we have to mark the entry as !exclusive - * (possibly shared). On swapin, we use that information to restore - * PG_anon_exclusive, which is very helpful in cases where we might have - * additional (e.g., FOLL_GET) references on a page and wouldn't be able to - * detect exclusivity. - * - * These functions don't apply to non-swap entries (e.g., migration, hwpoison, - * ...). - */ -#ifndef __HAVE_ARCH_PTE_SWP_EXCLUSIVE -static inline pte_t pte_swp_mkexclusive(pte_t pte) -{ - return pte; -} - -static inline int pte_swp_exclusive(pte_t pte) -{ - return false; -} - -static inline pte_t pte_swp_clear_exclusive(pte_t pte) -{ - return pte; -} -#endif - #ifdef CONFIG_HAVE_ARCH_SOFT_DIRTY #ifndef CONFIG_ARCH_ENABLE_THP_MIGRATION static inline pmd_t pmd_swp_mksoft_dirty(pmd_t pmd) diff --git a/mm/debug_vm_pgtable.c b/mm/debug_vm_pgtable.c index a0730beffd78..3da0cc380c35 100644 --- a/mm/debug_vm_pgtable.c +++ b/mm/debug_vm_pgtable.c @@ -810,7 +810,6 @@ static void __init pmd_swap_soft_dirty_tests(struct pgtable_debug_args *args) { static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) { -#ifdef __HAVE_ARCH_PTE_SWP_EXCLUSIVE unsigned long max_swapfile_size = generic_max_swapfile_size(); swp_entry_t entry, entry2; pte_t pte; @@ -839,7 +838,6 @@ static void __init pte_swap_exclusive_tests(struct pgtable_debug_args *args) WARN_ON(!is_swap_pte(pte)); entry2 = pte_to_swp_entry(pte); WARN_ON(memcmp(&entry, &entry2, sizeof(entry))); -#endif /* __HAVE_ARCH_PTE_SWP_EXCLUSIVE */ } static void __init pte_swap_tests(struct pgtable_debug_args *args) diff --git a/mm/memory.c b/mm/memory.c index abc4e606d8bc..ed853ba74366 100644 --- a/mm/memory.c +++ b/mm/memory.c @@ -3870,10 +3870,6 @@ vm_fault_t do_swap_page(struct vm_fault *vmf) * the swap entry concurrently) for certainly exclusive pages. */ if (!folio_test_ksm(folio)) { - /* - * Note that pte_swp_exclusive() == false for architectures - * without __HAVE_ARCH_PTE_SWP_EXCLUSIVE. - */ exclusive = pte_swp_exclusive(vmf->orig_pte); if (folio != swapcache) { /* diff --git a/mm/rmap.c b/mm/rmap.c index 0e450e6bb963..b26fbbcc9257 100644 --- a/mm/rmap.c +++ b/mm/rmap.c @@ -1710,17 +1710,6 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma, page_vma_mapped_walk_done(&pvmw); break; } - /* - * Note: We *don't* remember if the page was mapped - * exclusively in the swap pte if the architecture - * doesn't support __HAVE_ARCH_PTE_SWP_EXCLUSIVE. In - * that case, swapin code has to re-determine that - * manually and might detect the page as possibly - * shared, for example, if there are other references on - * the page or if the page is under writeback. We made - * sure that there are no GUP pins on the page that - * would rely on it, so for GUP pins this is fine. - */ if (list_empty(&mm->mmlist)) { spin_lock(&mmlist_lock); if (list_empty(&mm->mmlist))