From: David Stevens stevensd@chromium.org
commit 2e727bffbe93750a13d2414f3ce43de2f21600d2 upstream.
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@chromium.org Reviewed-by: Robin Murphy robin.murphy@arm.com Reviewed-by: Christoph Hellwig hch@lst.de Link: https://lore.kernel.org/r/20210929023300.335969-6-stevensd@google.com Signed-off-by: Joerg Roedel jroedel@suse.de Cc: Mario Limonciello Mario.Limonciello@amd.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/dma-iommu.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-)
--- a/drivers/iommu/dma-iommu.c +++ b/drivers/iommu/dma-iommu.c @@ -317,6 +317,11 @@ static bool dev_is_untrusted(struct devi 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); +} + /* sysfs updates are serialised by the mutex of the group owning @domain */ int iommu_dma_init_fq(struct iommu_domain *domain) { @@ -731,7 +736,7 @@ static void iommu_dma_sync_single_for_cp { 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_single_for_de { 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); @@ -765,7 +770,7 @@ static void iommu_dma_sync_sg_for_cpu(st 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); @@ -781,7 +786,7 @@ static void iommu_dma_sync_sg_for_device 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), @@ -808,8 +813,7 @@ static dma_addr_t iommu_dma_map_page(str * 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) && - iova_offset(iovad, phys | size)) { + if (dev_use_swiotlb(dev) && iova_offset(iovad, phys | size)) { void *padding_start; size_t padding_size;
@@ -995,7 +999,7 @@ static int iommu_dma_map_sg(struct devic goto out; }
- 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)) @@ -1073,7 +1077,7 @@ static void iommu_dma_unmap_sg(struct de 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; }