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authorFugang Duan <fugang.duan@nxp.com>2019-07-19 17:26:48 +0800
committerChristoph Hellwig <hch@lst.de>2019-07-19 14:09:40 +0200
commit449fa54d6815be8c2c1f68fa9dbbae9384a7c03e (patch)
treeb1d2c2c29c8725f8e634a284e2e23c391ed0e059 /kernel
parenta5008b59cd9d8de12ab623cb5052bb4735330e5c (diff)
downloadlinux-449fa54d6815be8c2c1f68fa9dbbae9384a7c03e.tar.bz2
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.c18
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);
}