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| author | Christoph Hellwig <hch@lst.de> | 2019-02-13 08:01:27 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2019-02-18 22:41:04 +1100 |
| commit | feee96440c9c5fdf47f8c8079c104fc8082924a0 (patch) | |
| tree | 6b61e0feb55fa765389c3c5909ec81015fda966e | |
| parent | 65a21b71f948406201e4f62e41f06513350ca390 (diff) | |
| download | linux-stable-feee96440c9c5fdf47f8c8079c104fc8082924a0.tar.gz linux-stable-feee96440c9c5fdf47f8c8079c104fc8082924a0.tar.bz2 linux-stable-feee96440c9c5fdf47f8c8079c104fc8082924a0.zip | |
swiotlb: remove swiotlb_dma_supported
The only user left is powerpc, but even there the generic dma-direct
version works just as well, given that we guarantee that the swiotlb
buffer must always be addressable.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
| -rw-r--r-- | arch/powerpc/kernel/dma-swiotlb.c | 2 | ||||
| -rw-r--r-- | include/linux/swiotlb.h | 3 | ||||
| -rw-r--r-- | kernel/dma/swiotlb.c | 12 |
3 files changed, 1 insertions, 16 deletions
diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c index d5950a0cb758..6d2677b2daa6 100644 --- a/arch/powerpc/kernel/dma-swiotlb.c +++ b/arch/powerpc/kernel/dma-swiotlb.c @@ -36,7 +36,7 @@ const struct dma_map_ops powerpc_swiotlb_dma_ops = { .free = __dma_nommu_free_coherent, .map_sg = dma_direct_map_sg, .unmap_sg = dma_direct_unmap_sg, - .dma_supported = swiotlb_dma_supported, + .dma_supported = dma_direct_supported, .map_page = dma_direct_map_page, .unmap_page = dma_direct_unmap_page, .sync_single_for_cpu = dma_direct_sync_single_for_cpu, diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 7c007ed7505f..54254388899e 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -60,9 +60,6 @@ extern void swiotlb_tbl_sync_single(struct device *hwdev, size_t size, enum dma_data_direction dir, enum dma_sync_target target); -extern int -swiotlb_dma_supported(struct device *hwdev, u64 mask); - #ifdef CONFIG_SWIOTLB extern enum swiotlb_force swiotlb_force; extern phys_addr_t io_tlb_start, io_tlb_end; diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index d6361776dc5c..cbf3498a46f9 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -648,15 +648,3 @@ bool swiotlb_map(struct device *dev, phys_addr_t *phys, dma_addr_t *dma_addr, return true; } - -/* - * Return whether the given device DMA address mask can be supported - * properly. For example, if your device can only drive the low 24-bits - * during bus mastering, then you would pass 0x00ffffff as the mask to - * this function. - */ -int -swiotlb_dma_supported(struct device *hwdev, u64 mask) -{ - return __phys_to_dma(hwdev, io_tlb_end - 1) <= mask; -} |