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Date: Mon, 16 Aug 2021 11:57:53 +0900 From: David Stevens <stevensd@...omium.org> To: Robin Murphy <robin.murphy@....com>, Christoph Hellwig <hch@....de> Cc: Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>, Lu Baolu <baolu.lu@...ux.intel.com>, Tom Murphy <murphyt7@....ie>, iommu@...ts.linux-foundation.org, linux-kernel@...r.kernel.org, David Stevens <stevensd@...omium.org> Subject: [PATCH v5 5/7] dma-iommu: Check CONFIG_SWIOTLB more broadly From: David Stevens <stevensd@...omium.org> Introduce a new dev_use_swiotlb function to guard swiotlb code, instead of overloading dev_is_untrusted. This allows CONFIG_SWIOTLB to be checked more broadly, so the swiotlb related code can be removed more aggressively. Signed-off-by: David Stevens <stevensd@...omium.org> Reviewed-by: Robin Murphy <robin.murphy@....com> Reviewed-by: Christoph Hellwig <hch@....de> --- drivers/iommu/dma-iommu.c | 19 ++++++++++++------- 1 file changed, 12 insertions(+), 7 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index f7da4934f7e6..bad813d63ea6 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -317,6 +317,11 @@ static bool dev_is_untrusted(struct device *dev) return dev_is_pci(dev) && to_pci_dev(dev)->untrusted; } +static bool dev_use_swiotlb(struct device *dev) +{ + return IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev); +} + /** * iommu_dma_init_domain - Initialise a DMA mapping domain * @domain: IOMMU domain previously prepared by iommu_get_dma_cookie() @@ -713,7 +718,7 @@ static void iommu_dma_sync_single_for_cpu(struct device *dev, { phys_addr_t phys; - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev)) + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev)) return; phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle); @@ -729,7 +734,7 @@ static void iommu_dma_sync_single_for_device(struct device *dev, { phys_addr_t phys; - if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev)) + if (dev_is_dma_coherent(dev) && !dev_use_swiotlb(dev)) return; phys = iommu_iova_to_phys(iommu_get_dma_domain(dev), dma_handle); @@ -747,7 +752,7 @@ static void iommu_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg; int i; - if (dev_is_untrusted(dev)) + if (dev_use_swiotlb(dev)) for_each_sg(sgl, sg, nelems, i) iommu_dma_sync_single_for_cpu(dev, sg_dma_address(sg), sg->length, dir); @@ -763,7 +768,7 @@ static void iommu_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg; int i; - if (dev_is_untrusted(dev)) + if (dev_use_swiotlb(dev)) for_each_sg(sgl, sg, nelems, i) iommu_dma_sync_single_for_device(dev, sg_dma_address(sg), @@ -790,7 +795,7 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, * If both the physical buffer start address and size are * page aligned, we don't need to use a bounce page. */ - if (IS_ENABLED(CONFIG_SWIOTLB) && dev_is_untrusted(dev) && + if (IS_ENABLED(CONFIG_SWIOTLB) && dev_use_swiotlb(dev) && iova_offset(iovad, phys | size)) { void *padding_start; size_t padding_size; @@ -975,7 +980,7 @@ static int iommu_dma_map_sg(struct device *dev, struct scatterlist *sg, iommu_deferred_attach(dev, domain)) return 0; - if (dev_is_untrusted(dev)) + if (dev_use_swiotlb(dev)) return iommu_dma_map_sg_swiotlb(dev, sg, nents, dir, attrs); if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) @@ -1047,7 +1052,7 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, struct scatterlist *tmp; int i; - if (dev_is_untrusted(dev)) { + if (dev_use_swiotlb(dev)) { iommu_dma_unmap_sg_swiotlb(dev, sg, nents, dir, attrs); return; } -- 2.33.0.rc1.237.g0d66db33f3-goog
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