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[2620:137:e000::1:20]) by mx.google.com with ESMTP id ku5-20020a170903288500b0019ca7d55b46si7057493plb.450.2023.02.27.10.03.28; Mon, 27 Feb 2023 10:03:40 -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=@infradead.org header.s=casper.20170209 header.b=h9bwi+L4; 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 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229776AbjB0R70 (ORCPT + 99 others); Mon, 27 Feb 2023 12:59:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:48904 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230318AbjB0R6X (ORCPT ); Mon, 27 Feb 2023 12:58:23 -0500 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 138166EBB; Mon, 27 Feb 2023 09:57:57 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=goynt5niP0v9aEgqldbKfY9zrWSKLPIYoftetp9ETpc=; b=h9bwi+L4iRtZ37pWgqIDBoxtKK pTb0mscbPk+KSfX6eWJRu62nCtpffCMdzZYfeziXT/kFRBuLmr/R0d9fcKcjo45DsxzJFwTwSn5ZF +jG4YRFrGOvcwRV50TenIrRq5GOR2gBoyBF7vIEkn38QNcHBFr5DQuAtDCf9WLWskDNCxNBowtSp8 wfgQ3pqAJb4RVeWDlrZjPAXMJrSI7OwTZ810kAoSMsN0o3uoupKwo7O+TtaPYy8kK3E/YPbmv8/c8 fxQ3q7BfcUr/uq+z8Z+LF/HF38kOVHW2WhKCmA1EDrZXGimqjzk6Hra11Pxc41wRyG2iwhRW7wSr7 WMS3O3eA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pWhkt-000IWr-6F; Mon, 27 Feb 2023 17:57:43 +0000 From: "Matthew Wilcox (Oracle)" To: linux-mm@kvack.org, linux-arch@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-kernel@vger.kernel.org Subject: [PATCH v2 02/30] mm: Add generic flush_icache_pages() and documentation Date: Mon, 27 Feb 2023 17:57:13 +0000 Message-Id: <20230227175741.71216-3-willy@infradead.org> X-Mailer: git-send-email 2.37.1 In-Reply-To: <20230227175741.71216-1-willy@infradead.org> References: <20230227175741.71216-1-willy@infradead.org> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,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?1759008282141094947?= X-GMAIL-MSGID: =?utf-8?q?1759008282141094947?= flush_icache_page() is deprecated but not yet removed, so add a range version of it. Change the documentation to refer to update_mmu_cache_range() instead of update_mmu_cache(). Signed-off-by: Matthew Wilcox (Oracle) --- Documentation/core-api/cachetlb.rst | 35 +++++++++++++++-------------- include/asm-generic/cacheflush.h | 5 +++++ 2 files changed, 23 insertions(+), 17 deletions(-) diff --git a/Documentation/core-api/cachetlb.rst b/Documentation/core-api/cachetlb.rst index 5c0552e78c58..d4c9e2a28d36 100644 --- a/Documentation/core-api/cachetlb.rst +++ b/Documentation/core-api/cachetlb.rst @@ -88,13 +88,13 @@ changes occur: This is used primarily during fault processing. -5) ``void update_mmu_cache(struct vm_area_struct *vma, - unsigned long address, pte_t *ptep)`` +5) ``void update_mmu_cache_range(struct vm_area_struct *vma, + unsigned long address, pte_t *ptep, unsigned int nr)`` - At the end of every page fault, this routine is invoked to - tell the architecture specific code that a translation - now exists at virtual address "address" for address space - "vma->vm_mm", in the software page tables. + At the end of every page fault, this routine is invoked to tell + the architecture specific code that translations now exists + in the software page tables for address space "vma->vm_mm" + at virtual address "address" for "nr" consecutive pages. A port may use this information in any way it so chooses. For example, it could use this event to pre-load TLB @@ -306,17 +306,18 @@ maps this page at its virtual address. private". The kernel guarantees that, for pagecache pages, it will clear this bit when such a page first enters the pagecache. - This allows these interfaces to be implemented much more efficiently. - It allows one to "defer" (perhaps indefinitely) the actual flush if - there are currently no user processes mapping this page. See sparc64's - flush_dcache_page and update_mmu_cache implementations for an example - of how to go about doing this. + This allows these interfaces to be implemented much more + efficiently. It allows one to "defer" (perhaps indefinitely) the + actual flush if there are currently no user processes mapping this + page. See sparc64's flush_dcache_page and update_mmu_cache_range + implementations for an example of how to go about doing this. - The idea is, first at flush_dcache_page() time, if page_file_mapping() - returns a mapping, and mapping_mapped on that mapping returns %false, - just mark the architecture private page flag bit. Later, in - update_mmu_cache(), a check is made of this flag bit, and if set the - flush is done and the flag bit is cleared. + The idea is, first at flush_dcache_page() time, if + page_file_mapping() returns a mapping, and mapping_mapped on that + mapping returns %false, just mark the architecture private page + flag bit. Later, in update_mmu_cache_range(), a check is made + of this flag bit, and if set the flush is done and the flag bit + is cleared. .. important:: @@ -369,7 +370,7 @@ maps this page at its virtual address. ``void flush_icache_page(struct vm_area_struct *vma, struct page *page)`` All the functionality of flush_icache_page can be implemented in - flush_dcache_page and update_mmu_cache. In the future, the hope + flush_dcache_page and update_mmu_cache_range. In the future, the hope is to remove this interface completely. The final category of APIs is for I/O to deliberately aliased address diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h index f46258d1a080..09d51a680765 100644 --- a/include/asm-generic/cacheflush.h +++ b/include/asm-generic/cacheflush.h @@ -78,6 +78,11 @@ static inline void flush_icache_range(unsigned long start, unsigned long end) #endif #ifndef flush_icache_page +static inline void flush_icache_pages(struct vm_area_struct *vma, + struct page *page, unsigned int nr) +{ +} + static inline void flush_icache_page(struct vm_area_struct *vma, struct page *page) {