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| author | Christoph Hellwig <hch@lst.de> | 2018-12-16 20:19:45 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-20 14:21:20 +0300 |
| commit | 0aeba2d0d27c7341c10aeae7f013ad5f034d8b2d (patch) | |
| tree | 17371a63e7763b3431c35c33982dd8c0dcf82c17 /arch/powerpc | |
| parent | 9286356907caa2d4737bd9dd8afe0b4ccaeea02b (diff) | |
| download | linux-0aeba2d0d27c7341c10aeae7f013ad5f034d8b2d.tar.xz | |
powerpc/dma: properly wire up the unmap_page and unmap_sg methods
The unmap methods need to transfer memory ownership back from the
device to the cpu by identical means as dma_sync_*_to_cpu. I'm not
sure powerpc needs to do any work in this transfer direction, but
given that it does invalidate the caches in dma_sync_*_to_cpu already
we should make sure we also do so on unmapping.
Signed-off-by: Christoph Hellwig <hch@lst.de>
[mpe: s/dir/direction in dma_nommu_unmap_page()]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kernel/dma.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c index dbfc7056d7df..9eb2cec15439 100644 --- a/arch/powerpc/kernel/dma.c +++ b/arch/powerpc/kernel/dma.c @@ -210,10 +210,15 @@ static int dma_nommu_map_sg(struct device *dev, struct scatterlist *sgl, return nents; } -static void dma_nommu_unmap_sg(struct device *dev, struct scatterlist *sg, +static void dma_nommu_unmap_sg(struct device *dev, struct scatterlist *sgl, int nents, enum dma_data_direction direction, unsigned long attrs) { + struct scatterlist *sg; + int i; + + for_each_sg(sgl, sg, nents, i) + __dma_sync_page(sg_page(sg), sg->offset, sg->length, direction); } static u64 dma_nommu_get_required_mask(struct device *dev) @@ -247,6 +252,8 @@ static inline void dma_nommu_unmap_page(struct device *dev, enum dma_data_direction direction, unsigned long attrs) { + if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC)) + __dma_sync(bus_to_virt(dma_address), size, direction); } #ifdef CONFIG_NOT_COHERENT_CACHE |