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[23.128.96.38]) by mx.google.com with ESMTPS id d1-20020a170902cec100b001d014c43a94si5223458plg.517.2023.12.02.05.55.05 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 02 Dec 2023 05:55:06 -0800 (PST) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.38 as permitted sender) client-ip=23.128.96.38; Authentication-Results: mx.google.com; dkim=pass header.i=@kernel.org header.s=k20201202 header.b=TLDhW872; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.38 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=kernel.org Received: from out1.vger.email (depot.vger.email [IPv6:2620:137:e000::3:0]) by fry.vger.email (Postfix) with ESMTP id 9FD2E8088A9A; Sat, 2 Dec 2023 05:55:03 -0800 (PST) X-Virus-Status: Clean X-Virus-Scanned: clamav-milter 0.103.11 at fry.vger.email Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232888AbjLBNyq (ORCPT + 99 others); Sat, 2 Dec 2023 08:54:46 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:41178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232883AbjLBNyo (ORCPT ); Sat, 2 Dec 2023 08:54:44 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 041CC116 for ; Sat, 2 Dec 2023 05:54:51 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 848CCC433C7; Sat, 2 Dec 2023 13:54:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1701525290; bh=bomojrOAMU2gHGxmYDLygOQUoO4KABGe2Me37Cc0YE0=; h=From:To:Cc:Subject:Date:From; b=TLDhW872Qeq6T2lOiL/tmbelYRkMW2rIQaE4jkN2Q7OnQKvnK0+B81Hngx2UZIR6/ ETWx7tcNYE1TVKJ/8r0TWFldBBt2c6NYUdKvD/W53sET147ei1ih0uJTMZ62Xg1vv+ D/4V4wCKLUKiU811CGfxekWJC4K6Fggm+IeihHucqryvW612yFnA8LGBAEtNM8svgs vMuRCcbUFUwuUPLb6beNdkzHMJzbgsMvem8OkFLCefLaFbR1d0cEhJFlyN0VhjWcFn yRoteBGcCKVHJ9iOC9iJtNNYym5kkvhP81ByRe4F8vGM9m0Du3s0rI+Ok4JtfJDPIx Vyg8Ib3CbhMAQ== From: Jisheng Zhang To: Paul Walmsley , Palmer Dabbelt , Albert Ou Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org Subject: [PATCH v2] riscv: mm: still create swiotlb buffer for kmalloc() bouncing if required Date: Sat, 2 Dec 2023 21:42:24 +0800 Message-Id: <20231202134224.4029-1-jszhang@kernel.org> X-Mailer: git-send-email 2.40.0 MIME-Version: 1.0 X-Spam-Status: No, score=-1.2 required=5.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on fry.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (fry.vger.email [0.0.0.0]); Sat, 02 Dec 2023 05:55:03 -0800 (PST) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1784178599313109860 X-GMAIL-MSGID: 1784178599313109860 After commit f51f7a0fc2f4 ("riscv: enable DMA_BOUNCE_UNALIGNED_KMALLOC for !dma_coherent"), for non-coherent platforms with less than 4GB memory, we rely on users to pass "swiotlb=mmnn,force" kernel parameters to enable DMA bouncing for unaligned kmalloc() buffers. Now let's go further: If no bouncing needed for ZONE_DMA, let kernel automatically allocate 1MB swiotlb buffer per 1GB of RAM for kmalloc() bouncing on non-coherent platforms, so that no need to pass "swiotlb=mmnn,force" any more. The math of "1MB swiotlb buffer per 1GB of RAM for kmalloc() bouncing" is taken from arm64. Users can still force smaller swiotlb buffer by passing "swiotlb=mmnn". Signed-off-by: Jisheng Zhang Reviewed-by: Alexandre Ghiti --- since v2: - fix build error if CONFIG_RISCV_DMA_NONCOHERENT=n arch/riscv/include/asm/cache.h | 2 +- arch/riscv/mm/init.c | 16 +++++++++++++++- 2 files changed, 16 insertions(+), 2 deletions(-) diff --git a/arch/riscv/include/asm/cache.h b/arch/riscv/include/asm/cache.h index 2174fe7bac9a..570e9d8acad1 100644 --- a/arch/riscv/include/asm/cache.h +++ b/arch/riscv/include/asm/cache.h @@ -26,8 +26,8 @@ #ifndef __ASSEMBLY__ -#ifdef CONFIG_RISCV_DMA_NONCOHERENT extern int dma_cache_alignment; +#ifdef CONFIG_RISCV_DMA_NONCOHERENT #define dma_get_cache_alignment dma_get_cache_alignment static inline int dma_get_cache_alignment(void) { diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 2e011cbddf3a..cbcb9918f721 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -162,11 +162,25 @@ static void print_vm_layout(void) { } void __init mem_init(void) { + bool swiotlb = max_pfn > PFN_DOWN(dma32_phys_limit); #ifdef CONFIG_FLATMEM BUG_ON(!mem_map); #endif /* CONFIG_FLATMEM */ - swiotlb_init(max_pfn > PFN_DOWN(dma32_phys_limit), SWIOTLB_VERBOSE); + if (IS_ENABLED(CONFIG_DMA_BOUNCE_UNALIGNED_KMALLOC) && !swiotlb && + dma_cache_alignment != 1) { + /* + * If no bouncing needed for ZONE_DMA, allocate 1MB swiotlb + * buffer per 1GB of RAM for kmalloc() bouncing on + * non-coherent platforms. + */ + unsigned long size = + DIV_ROUND_UP(memblock_phys_mem_size(), 1024); + swiotlb_adjust_size(min(swiotlb_size_or_default(), size)); + swiotlb = true; + } + + swiotlb_init(swiotlb, SWIOTLB_VERBOSE); memblock_free_all(); print_vm_layout();