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| author | Robin Murphy <Robin.Murphy@arm.com> | 2015-07-17 16:58:21 +0100 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2015-07-27 11:08:40 +0100 |
| commit | 1d1ddf67dc3bfd80f60b216fa1fedfb242bee299 (patch) | |
| tree | e62ad9b0949e30bc058c8aea75ce11dcb38e72da /arch/arm64/mm | |
| parent | 4b3dc9679cf779339d9049800803dfc3c83433d1 (diff) | |
| download | linux-1d1ddf67dc3bfd80f60b216fa1fedfb242bee299.tar.gz linux-1d1ddf67dc3bfd80f60b216fa1fedfb242bee299.tar.bz2 linux-1d1ddf67dc3bfd80f60b216fa1fedfb242bee299.zip | |
arm64: dma-mapping: implement dma_get_sgtable()
The default dma_common_get_sgtable() implementation relies on the CPU
address of the buffer being a regular lowmem address. This is not always
the case on arm64, since allocations from the various DMA pools may have
remapped vmalloc addresses, rendering the use of virt_to_page() invalid.
Fix this by providing our own implementation based on the fact that we
can safely derive a physical address from the DMA address in both cases.
CC: Jon Medhurst <tixy@linaro.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
[will: made static]
Signed-off-by: Will Deacon <will.deacon@arm.com>
Diffstat (limited to 'arch/arm64/mm')
| -rw-r--r-- | arch/arm64/mm/dma-mapping.c | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/arm64/mm/dma-mapping.c b/arch/arm64/mm/dma-mapping.c index 63b2a117a03c..e5d74cdfdb71 100644 --- a/arch/arm64/mm/dma-mapping.c +++ b/arch/arm64/mm/dma-mapping.c @@ -331,10 +331,24 @@ static int __swiotlb_mmap(struct device *dev, return ret; } +static int __swiotlb_get_sgtable(struct device *dev, struct sg_table *sgt, + void *cpu_addr, dma_addr_t handle, size_t size, + struct dma_attrs *attrs) +{ + int ret = sg_alloc_table(sgt, 1, GFP_KERNEL); + + if (!ret) + sg_set_page(sgt->sgl, phys_to_page(dma_to_phys(dev, handle)), + PAGE_ALIGN(size), 0); + + return ret; +} + static struct dma_map_ops swiotlb_dma_ops = { .alloc = __dma_alloc, .free = __dma_free, .mmap = __swiotlb_mmap, + .get_sgtable = __swiotlb_get_sgtable, .map_page = __swiotlb_map_page, .unmap_page = __swiotlb_unmap_page, .map_sg = __swiotlb_map_sg_attrs, |