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| author | Fugang Duan <fugang.duan@nxp.com> | 2019-07-19 11:26:48 +0200 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2019-07-19 14:09:40 +0200 |
| commit | 449fa54d6815be8c2c1f68fa9dbbae9384a7c03e (patch) | |
| tree | b1d2c2c29c8725f8e634a284e2e23c391ed0e059 /kernel | |
| parent | dma-direct: only limit the mapping size if swiotlb could be used (diff) | |
| download | linux-449fa54d6815be8c2c1f68fa9dbbae9384a7c03e.tar.xz linux-449fa54d6815be8c2c1f68fa9dbbae9384a7c03e.zip | |
dma-direct: correct the physical addr in dma_direct_sync_sg_for_cpu/device
dma_map_sg() may use swiotlb buffer when the kernel command line includes
"swiotlb=force" or the dma_addr is out of dev->dma_mask range. After
DMA complete the memory moving from device to memory, then user call
dma_sync_sg_for_cpu() to sync with DMA buffer, and copy the original
virtual buffer to other space.
So dma_direct_sync_sg_for_cpu() should use swiotlb physical addr, not
the original physical addr from sg_phys(sg).
dma_direct_sync_sg_for_device() also has the same issue, correct it as
well.
Fixes: 55897af63091("dma-direct: merge swiotlb_dma_ops into the dma_direct code")
Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/dma/direct.c | 18 |
1 files changed, 11 insertions, 7 deletions
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c index e269b6f9b444..59bdceea3737 100644 --- a/kernel/dma/direct.c +++ b/kernel/dma/direct.c @@ -234,12 +234,14 @@ void dma_direct_sync_sg_for_device(struct device *dev, int i; for_each_sg(sgl, sg, nents, i) { - if (unlikely(is_swiotlb_buffer(sg_phys(sg)))) - swiotlb_tbl_sync_single(dev, sg_phys(sg), sg->length, + phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg)); + + if (unlikely(is_swiotlb_buffer(paddr))) + swiotlb_tbl_sync_single(dev, paddr, sg->length, dir, SYNC_FOR_DEVICE); if (!dev_is_dma_coherent(dev)) - arch_sync_dma_for_device(dev, sg_phys(sg), sg->length, + arch_sync_dma_for_device(dev, paddr, sg->length, dir); } } @@ -271,11 +273,13 @@ void dma_direct_sync_sg_for_cpu(struct device *dev, int i; for_each_sg(sgl, sg, nents, i) { + phys_addr_t paddr = dma_to_phys(dev, sg_dma_address(sg)); + if (!dev_is_dma_coherent(dev)) - arch_sync_dma_for_cpu(dev, sg_phys(sg), sg->length, dir); - - if (unlikely(is_swiotlb_buffer(sg_phys(sg)))) - swiotlb_tbl_sync_single(dev, sg_phys(sg), sg->length, dir, + arch_sync_dma_for_cpu(dev, paddr, sg->length, dir); + + if (unlikely(is_swiotlb_buffer(paddr))) + swiotlb_tbl_sync_single(dev, paddr, sg->length, dir, SYNC_FOR_CPU); } |