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Tsirkin" , Miguel Ojeda , Robin Murphy , rust-for-linux@vger.kernel.org, Sagi Grimberg , Stefano Stabellini , Steven Rostedt , virtualization@lists.linux.dev, Will Deacon , xen-devel@lists.xenproject.org Subject: [PATCH v6 06/16] iommu/dma: implement DMA_ATTR_MMIO for iommu_dma_(un)map_phys() Date: Tue, 9 Sep 2025 16:27:34 +0300 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2078420004 X-Stat-Signature: r53dqinx8r874q7ton3qriqaeet9qgxj X-Rspam-User: X-HE-Tag: 1757424516-561831 X-HE-Meta: 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 6toCPGgf f5q8o+3qQ+O+2s+hVq8Ur90csOXdf00cGMyBVSa8AkCAgt+6saE/69E0SoSC61YYVYEi92wGywoCtPa1yCDp0u24pEDkin/DqLS6ir15++QCnRriJCrx1Vc7BRz2MEwbffpYiWxcWKe2QWD0jFgT+9dZrcRJlCmkYoB/e2qGPgo1MSplac/On0CsRbIb/a9hbUDTzFIzlO42boPDwaJYijzbflnc3V/7tHXcJzjP/13lFY82AX1HDxgVRA52lO+V9rEMr4VjDo72S9JAWuK+3rs6RZqzCP+q808nnjqNkuTPiIqFdwlnx0WfGdw== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Leon Romanovsky Make iommu_dma_map_phys() and iommu_dma_unmap_phys() respect DMA_ATTR_MMIO. DMA_ATTR_MMIO makes the functions behave the same as iommu_dma_(un)map_resource(): - No swiotlb is possible - No cache flushing is done (ATTR_MMIO should not be cached memory) - prot for iommu_map() has IOMMU_MMIO not IOMMU_CACHE This is preparation for replacing iommu_dma_map_resource() callers with iommu_dma_map_phys(DMA_ATTR_MMIO) and removing iommu_dma_(un)map_resource(). Reviewed-by: Jason Gunthorpe Signed-off-by: Leon Romanovsky --- drivers/iommu/dma-iommu.c | 15 +++++++++++---- 1 file changed, 11 insertions(+), 4 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index aea119f32f965..6804aaf034a16 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -1211,16 +1211,19 @@ dma_addr_t iommu_dma_map_phys(struct device *dev, phys_addr_t phys, size_t size, */ if (dev_use_swiotlb(dev, size, dir) && iova_unaligned(iovad, phys, size)) { + if (attrs & DMA_ATTR_MMIO) + return DMA_MAPPING_ERROR; + phys = iommu_dma_map_swiotlb(dev, phys, size, dir, attrs); if (phys == (phys_addr_t)DMA_MAPPING_ERROR) return DMA_MAPPING_ERROR; } - if (!coherent && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + if (!coherent && !(attrs & (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_MMIO))) arch_sync_dma_for_device(phys, size, dir); iova = __iommu_dma_map(dev, phys, size, prot, dma_mask); - if (iova == DMA_MAPPING_ERROR) + if (iova == DMA_MAPPING_ERROR && !(attrs & DMA_ATTR_MMIO)) swiotlb_tbl_unmap_single(dev, phys, size, dir, attrs); return iova; } @@ -1228,10 +1231,14 @@ dma_addr_t iommu_dma_map_phys(struct device *dev, phys_addr_t phys, size_t size, void iommu_dma_unmap_phys(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { - struct iommu_domain *domain = iommu_get_dma_domain(dev); phys_addr_t phys; - phys = iommu_iova_to_phys(domain, dma_handle); + if (attrs & DMA_ATTR_MMIO) { + __iommu_dma_unmap(dev, dma_handle, size); + return; + } + + phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle); if (WARN_ON(!phys)) return; -- 2.51.0