[PATCH v2 1/4] dma-iommu: fix sync_sg with swiotlb

David Stevens
2021-07-09T03:35:29Z

From: David Stevens <stevensd@chromium.org>

The is_swiotlb_buffer function takes the physical address of the swiotlb
buffer, not the physical address of the original buffer. The sglist
contains the physical addresses of the original buffer, so for the
sync_sg functions to work properly when a bounce buffer might have been
used, we need to use iommu_iova_to_phys to look up the physical address.
This is what sync_single does, so call that function on each sglist
segment.

The previous code mostly worked because swiotlb does the transfer on map
and unmap. However, any callers which use DMA_ATTR_SKIP_CPU_SYNC with
sglists or which call sync_sg would not have had anything copied to the
bounce buffer.

Fixes: 82612d66d51d ("iommu: Allow the dma-iommu api to use bounce buffers")
Signed-off-by: David Stevens <stevensd@chromium.org>
---
drivers/iommu/dma-iommu.c | 26 +++++++++++++-------------
1 file changed, 13 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/dma-iommu.c b/drivers/iommu/dma-iommu.c
index 7bcdd1205535..eac65302439e 100644
--- a/drivers/iommu/dma-iommu.c
+++ b/drivers/iommu/dma-iommu.c
@@ -811,14 +811,14 @@ static void iommu_dma_sync_sg_for_cpu(struct device *dev,
if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
return;

- for_each_sg(sgl, sg, nelems, i) {
- if (!dev_is_dma_coherent(dev))
- arch_sync_dma_for_cpu(sg_phys(sg), sg->length, dir);
-
- if (is_swiotlb_buffer(sg_phys(sg)))
+ if (dev_is_untrusted(dev))
+ for_each_sg(sgl, sg, nelems, i)
+ iommu_dma_sync_single_for_cpu(dev, sg_dma_address(sg),
+ sg->length, dir);
+ else
+ for_each_sg(sgl, sg, nelems, i)
swiotlb_sync_single_for_cpu(dev, sg_phys(sg),
sg->length, dir);
- }
}

static void iommu_dma_sync_sg_for_device(struct device *dev,
@@ -831,14 +831,14 @@ static void iommu_dma_sync_sg_for_device(struct device *dev,
if (dev_is_dma_coherent(dev) && !dev_is_untrusted(dev))
return;

- for_each_sg(sgl, sg, nelems, i) {
- if (is_swiotlb_buffer(sg_phys(sg)))
- swiotlb_sync_single_for_device(dev, sg_phys(sg),
- sg->length, dir);
-
- if (!dev_is_dma_coherent(dev))
+ if (dev_is_untrusted(dev))
+ for_each_sg(sgl, sg, nelems, i)
+ iommu_dma_sync_single_for_device(dev,
+ sg_dma_address(sg),
+ sg->length, dir);
+ else
+ for_each_sg(sgl, sg, nelems, i)
arch_sync_dma_for_device(sg_phys(sg), sg->length, dir);
- }
}

static dma_addr_t iommu_dma_map_page(struct device *dev, struct page *page,
--
2.32.0.93.g670b81a890-goog