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Fri, 26 Dec 2025 14:53:56 -0800 (PST) Received: from barry-desktop.hub ([47.72.129.29]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-34e772ac1acsm9981428a91.9.2025.12.26.14.53.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 26 Dec 2025 14:53:55 -0800 (PST) From: Barry Song <21cnbao@gmail.com> To: catalin.marinas@arm.com, m.szyprowski@samsung.com, robin.murphy@arm.com, will@kernel.org, iommu@lists.linux.dev, linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org, Barry Song , Leon Romanovsky , Ada Couprie Diaz , Ard Biesheuvel , Marc Zyngier , Anshuman Khandual , Ryan Roberts , Suren Baghdasaryan , Tangquan Zheng Subject: [PATCH v2 5/8] dma-mapping: Support batch mode for dma_direct_sync_sg_for_* Date: Sat, 27 Dec 2025 11:52:45 +1300 Message-ID: <20251226225254.46197-6-21cnbao@gmail.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20251226225254.46197-1-21cnbao@gmail.com> References: <20251226225254.46197-1-21cnbao@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Barry Song Instead of performing a flush per SG entry, issue all cache operations first and then flush once. This ultimately benefits __dma_sync_sg_for_cpu() and __dma_sync_sg_for_device(). Cc: Leon Romanovsky Cc: Catalin Marinas Cc: Will Deacon Cc: Marek Szyprowski Cc: Robin Murphy Cc: Ada Couprie Diaz Cc: Ard Biesheuvel Cc: Marc Zyngier Cc: Anshuman Khandual Cc: Ryan Roberts Cc: Suren Baghdasaryan Cc: Tangquan Zheng Signed-off-by: Barry Song --- kernel/dma/direct.c | 14 +++++++------- 1 file changed, 7 insertions(+), 7 deletions(-) diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index a219911c7b90..98bacf562ca1 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -402,12 +402,12 @@ void dma_direct_sync_sg_for_device(struct device *dev, =20 swiotlb_sync_single_for_device(dev, paddr, sg->length, dir); =20 - if (!dev_is_dma_coherent(dev)) { + if (!dev_is_dma_coherent(dev)) arch_sync_dma_for_device(paddr, sg->length, dir); - arch_sync_dma_flush(); - } } + if (!dev_is_dma_coherent(dev)) + arch_sync_dma_flush(); } #endif =20 @@ -423,10 +423,8 @@ void dma_direct_sync_sg_for_cpu(struct device *dev, for_each_sg(sgl, sg, nents, i) { phys_addr_t paddr =3D dma_to_phys(dev, sg_dma_address(sg)); =20 - if (!dev_is_dma_coherent(dev)) { + if (!dev_is_dma_coherent(dev)) arch_sync_dma_for_cpu(paddr, sg->length, dir); - arch_sync_dma_flush(); - } =20 swiotlb_sync_single_for_cpu(dev, paddr, sg->length, dir); =20 @@ -434,8 +432,10 @@ void dma_direct_sync_sg_for_cpu(struct device *dev, arch_dma_mark_clean(paddr, sg->length); } =20 - if (!dev_is_dma_coherent(dev)) + if (!dev_is_dma_coherent(dev)) { + arch_sync_dma_flush(); arch_sync_dma_for_cpu_all(); + } } =20 /* --=20 2.43.0