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iommu/dma: add missing support for DMA_ATTR_MMIO for dma_iova_unlink()

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Commit c288d657dd added support for DMA_ATTR_MMIO attribute in the
dma_iova_link() code path, but missed that the CPU cache is being also
touched in the dma_iova_unlink() path. Fix this.

Fixes: c288d657dd ("iommu/dma: implement DMA_ATTR_MMIO for dma_iova_link().")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Leon Romanovsky <leon@kernel.org>
Link: https://lore.kernel.org/r/20251124170955.3884351-1-m.szyprowski@samsung.com
This commit is contained in:
Marek Szyprowski
2025-11-24 18:09:55 +01:00
parent a50f7456f8
commit 1a96f3a22f
1 changed files with 3 additions and 2 deletions
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5
drivers/iommu/dma-iommu.c
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@@ -2008,7 +2008,7 @@ static void iommu_dma_iova_unlink_range_slow(struct device *dev,
end - addr, iovad->granule - iova_start_pad);
if (!dev_is_dma_coherent(dev) &&
!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
!(attrs & (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_MMIO)))
arch_sync_dma_for_cpu(phys, len, dir);
swiotlb_tbl_unmap_single(dev, phys, len, dir, attrs);
@@ -2032,7 +2032,8 @@ static void __iommu_dma_iova_unlink(struct device *dev,
size_t unmapped;
if ((state->__size & DMA_IOVA_USE_SWIOTLB) ||
(!dev_is_dma_coherent(dev) && !(attrs & DMA_ATTR_SKIP_CPU_SYNC)))
(!dev_is_dma_coherent(dev) &&
!(attrs & (DMA_ATTR_SKIP_CPU_SYNC | DMA_ATTR_MMIO))))
iommu_dma_iova_unlink_range_slow(dev, addr, size, dir, attrs);
iommu_iotlb_gather_init(&iotlb_gather);