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authorChristoph Hellwig <hch@lst.de>2018-07-27 19:26:06 +0200
committerPaul Burton <paul.burton@mips.com>2018-07-27 15:19:59 -0700
commita999933db9ed44f8501e0241f7f1fbdf36554396 (patch)
tree582181edf96f6389672c90b94654dd6acbaa9aaf /arch/mips/mm
parentd4da0e97baea8768b3d66ccef3967bebd50dfc3b (diff)
MIPS: remove mips_swiotlb_ops
mips_swiotlb_ops differs from the generic swiotlb_dma_ops only in that it contains a mb() barrier after each operations that maps or syncs dma memory to the device. The dma operations are defined to not be memory barriers, but instead the write* operations to kick the DMA off are supposed to contain them. For mips this handled by war_io_reorder_wmb(), which evaluates to the stronger wmb() instead of the pure compiler barrier barrier() for just those platforms that use swiotlb, so I think we are covered properly. [paul.burton@mips.com: - Include linux/swiotlb.h to fix build failures for configs with CONFIG_SWIOTLB=y.] Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Paul Burton <paul.burton@mips.com> Patchwork: https://patchwork.linux-mips.org/patch/20038/ Cc: David Daney <ddaney@caviumnetworks.com> Cc: Huacai Chen <chenhc@lemote.com> Cc: linux-mips@linux-mips.org Cc: iommu@lists.linux-foundation.org Cc: linux-kernel@vger.kernel.org
Diffstat (limited to 'arch/mips/mm')
-rw-r--r--arch/mips/mm/Makefile1
-rw-r--r--arch/mips/mm/dma-swiotlb.c61
2 files changed, 0 insertions, 62 deletions
diff --git a/arch/mips/mm/Makefile b/arch/mips/mm/Makefile
index 6922f393af19..3e5bb203c95a 100644
--- a/arch/mips/mm/Makefile
+++ b/arch/mips/mm/Makefile
@@ -18,7 +18,6 @@ obj-$(CONFIG_64BIT) += pgtable-64.o
obj-$(CONFIG_HIGHMEM) += highmem.o
obj-$(CONFIG_HUGETLB_PAGE) += hugetlbpage.o
obj-$(CONFIG_DMA_NONCOHERENT) += dma-noncoherent.o
-obj-$(CONFIG_SWIOTLB) += dma-swiotlb.o
obj-$(CONFIG_CPU_R4K_CACHE_TLB) += c-r4k.o cex-gen.o tlb-r4k.o
obj-$(CONFIG_CPU_R3000) += c-r3k.o tlb-r3k.o
diff --git a/arch/mips/mm/dma-swiotlb.c b/arch/mips/mm/dma-swiotlb.c
deleted file mode 100644
index 6014ed3479fd..000000000000
--- a/arch/mips/mm/dma-swiotlb.c
+++ /dev/null
@@ -1,61 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-#include <linux/dma-mapping.h>
-#include <linux/swiotlb.h>
-
-static void *mips_swiotlb_alloc(struct device *dev, size_t size,
- dma_addr_t *dma_handle, gfp_t gfp, unsigned long attrs)
-{
- void *ret = swiotlb_alloc(dev, size, dma_handle, gfp, attrs);
-
- mb();
- return ret;
-}
-
-static dma_addr_t mips_swiotlb_map_page(struct device *dev,
- struct page *page, unsigned long offset, size_t size,
- enum dma_data_direction dir, unsigned long attrs)
-{
- dma_addr_t daddr = swiotlb_map_page(dev, page, offset, size,
- dir, attrs);
- mb();
- return daddr;
-}
-
-static int mips_swiotlb_map_sg(struct device *dev, struct scatterlist *sg,
- int nents, enum dma_data_direction dir, unsigned long attrs)
-{
- int r = swiotlb_map_sg_attrs(dev, sg, nents, dir, attrs);
- mb();
-
- return r;
-}
-
-static void mips_swiotlb_sync_single_for_device(struct device *dev,
- dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
-{
- swiotlb_sync_single_for_device(dev, dma_handle, size, dir);
- mb();
-}
-
-static void mips_swiotlb_sync_sg_for_device(struct device *dev,
- struct scatterlist *sg, int nents, enum dma_data_direction dir)
-{
- swiotlb_sync_sg_for_device(dev, sg, nents, dir);
- mb();
-}
-
-const struct dma_map_ops mips_swiotlb_ops = {
- .alloc = mips_swiotlb_alloc,
- .free = swiotlb_free,
- .map_page = mips_swiotlb_map_page,
- .unmap_page = swiotlb_unmap_page,
- .map_sg = mips_swiotlb_map_sg,
- .unmap_sg = swiotlb_unmap_sg_attrs,
- .sync_single_for_cpu = swiotlb_sync_single_for_cpu,
- .sync_single_for_device = mips_swiotlb_sync_single_for_device,
- .sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
- .sync_sg_for_device = mips_swiotlb_sync_sg_for_device,
- .mapping_error = swiotlb_dma_mapping_error,
- .dma_supported = swiotlb_dma_supported,
-};
-EXPORT_SYMBOL(mips_swiotlb_ops);