From c3841d020b82f6d92f8ac84ef2bb2f398c6eae7e Mon Sep 17 00:00:00 2001 From: David Stevens Date: Wed, 29 Sep 2021 11:32:56 +0900 Subject: [PATCH] iommu/dma: Skip extra sync during unmap w/swiotlb commit ee9d4097cc145dcaebedf6b113d17c91c21333a0 upstream. Calling the iommu_dma_sync_*_for_cpu functions during unmap can cause two copies out of the swiotlb buffer. Do the arch sync directly in __iommu_dma_unmap_swiotlb instead to avoid this. This makes the call to iommu_dma_sync_sg_for_cpu for untrusted devices in iommu_dma_unmap_sg no longer necessary, so move that invocation later in the function. Signed-off-by: David Stevens Reviewed-by: Christoph Hellwig Reviewed-by: Robin Murphy Link: https://lore.kernel.org/r/20210929023300.335969-4-stevensd@google.com Signed-off-by: Joerg Roedel Cc: Mario Limonciello Signed-off-by: Greg Kroah-Hartman --- drivers/iommu/dma-iommu.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c index 2d60216..8e434e2 100644 --- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -521,6 +521,9 @@ static void __iommu_dma_unmap_swiotlb(struct device *dev, dma_addr_t dma_addr, if (WARN_ON(!phys)) return; + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC) && !dev_is_dma_coherent(dev)) + arch_sync_dma_for_cpu(phys, size, dir); + __iommu_dma_unmap(dev, dma_addr, size); if (unlikely(is_swiotlb_buffer(dev, phys))) @@ -871,8 +874,6 @@ static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page, static void iommu_dma_unmap_page(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir, unsigned long attrs) { - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - iommu_dma_sync_single_for_cpu(dev, dma_handle, size, dir); __iommu_dma_unmap_swiotlb(dev, dma_handle, size, dir, attrs); } @@ -1089,14 +1090,14 @@ static void iommu_dma_unmap_sg(struct device *dev, struct scatterlist *sg, struct scatterlist *tmp; int i; - if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) - iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir); - if (dev_is_untrusted(dev)) { iommu_dma_unmap_sg_swiotlb(dev, sg, nents, dir, attrs); return; } + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + iommu_dma_sync_sg_for_cpu(dev, sg, nents, dir); + /* * The scatterlist segments are mapped into a single * contiguous IOVA allocation, so this is incredibly easy. -- 2.7.4