[PATCH 02/23] dma-direct: remove the mapping_error dma_map_ops method

Christoph Hellwig
2018-11-30T13:22:10Z

The dma-direct code already returns (~(dma_addr_t)0x0) on mapping
failures, so we can switch over to returning DMA_MAPPING_ERROR and let
the core dma-mapping code handle the rest.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/powerpc/kernel/dma-swiotlb.c | 1 -
include/linux/dma-direct.h | 3 ---
kernel/dma/direct.c | 8 +-------
kernel/dma/swiotlb.c | 11 +++++------
4 files changed, 6 insertions(+), 17 deletions(-)

diff --git a/arch/powerpc/kernel/dma-swiotlb.c b/arch/powerpc/kernel/dma-swiotlb.c
index 5fc335f4d9cd..3d8df2cf8be9 100644
--- a/arch/powerpc/kernel/dma-swiotlb.c
+++ b/arch/powerpc/kernel/dma-swiotlb.c
@@ -59,7 +59,6 @@ const struct dma_map_ops powerpc_swiotlb_dma_ops = {
.sync_single_for_device = swiotlb_sync_single_for_device,
.sync_sg_for_cpu = swiotlb_sync_sg_for_cpu,
.sync_sg_for_device = swiotlb_sync_sg_for_device,
- .mapping_error = dma_direct_mapping_error,
.get_required_mask = swiotlb_powerpc_get_required,
};

diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h
index 9e66bfe369aa..e7600f92d876 100644
--- a/include/linux/dma-direct.h
+++ b/include/linux/dma-direct.h
@@ -5,8 +5,6 @@
#include <linux/dma-mapping.h>
#include <linux/mem_encrypt.h>

-#define DIRECT_MAPPING_ERROR (~(dma_addr_t)0)
-
#ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA
#include <asm/dma-direct.h>
#else
@@ -73,5 +71,4 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
int dma_direct_map_sg(struct device *dev, struct scatterlist *sgl, int nents,
enum dma_data_direction dir, unsigned long attrs);
int dma_direct_supported(struct device *dev, u64 mask);
-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr);
#endif /* _LINUX_DMA_DIRECT_H */
diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c
index 22a12ab5a5e9..d4335a03193a 100644
--- a/kernel/dma/direct.c
+++ b/kernel/dma/direct.c
@@ -265,7 +265,7 @@ dma_addr_t dma_direct_map_page(struct device *dev, struct page *page,
dma_addr_t dma_addr = phys_to_dma(dev, phys);

if (!check_addr(dev, dma_addr, size, __func__))
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
dma_direct_sync_single_for_device(dev, dma_addr, size, dir);
@@ -312,11 +312,6 @@ int dma_direct_supported(struct device *dev, u64 mask)
return mask >= phys_to_dma(dev, min_mask);
}

-int dma_direct_mapping_error(struct device *dev, dma_addr_t dma_addr)
-{
- return dma_addr = DIRECT_MAPPING_ERROR;
-}
-
const struct dma_map_ops dma_direct_ops = {
.alloc = dma_direct_alloc,
.free = dma_direct_free,
@@ -335,7 +330,6 @@ const struct dma_map_ops dma_direct_ops = {
#endif
.get_required_mask = dma_direct_get_required_mask,
.dma_supported = dma_direct_supported,
- .mapping_error = dma_direct_mapping_error,
.cache_sync = arch_dma_cache_sync,
};
EXPORT_SYMBOL(dma_direct_ops);
diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c
index 045930e32c0e..ff1ce81bb623 100644
--- a/kernel/dma/swiotlb.c
+++ b/kernel/dma/swiotlb.c
@@ -631,21 +631,21 @@ static dma_addr_t swiotlb_bounce_page(struct device *dev, phys_addr_t *phys,
if (unlikely(swiotlb_force = SWIOTLB_NO_FORCE)) {
dev_warn_ratelimited(dev,
"Cannot do DMA to address %pa\n", phys);
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

/* Oh well, have to allocate and map a bounce buffer. */
*phys = swiotlb_tbl_map_single(dev, __phys_to_dma(dev, io_tlb_start),
*phys, size, dir, attrs);
if (*phys = SWIOTLB_MAP_ERROR)
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;

/* Ensure that the address returned is DMA'ble */
dma_addr = __phys_to_dma(dev, *phys);
if (unlikely(!dma_capable(dev, dma_addr, size))) {
swiotlb_tbl_unmap_single(dev, *phys, size, dir,
attrs | DMA_ATTR_SKIP_CPU_SYNC);
- return DIRECT_MAPPING_ERROR;
+ return DMA_MAPPING_ERROR;
}

return dma_addr;
@@ -680,7 +680,7 @@ dma_addr_t swiotlb_map_page(struct device *dev, struct page *page,

if (!dev_is_dma_coherent(dev) &&
(attrs & DMA_ATTR_SKIP_CPU_SYNC) = 0 &&
- dev_addr != DIRECT_MAPPING_ERROR)
+ dev_addr != DMA_MAPPING_ERROR)
arch_sync_dma_for_device(dev, phys, size, dir);

return dev_addr;
@@ -789,7 +789,7 @@ swiotlb_map_sg_attrs(struct device *dev, struct scatterlist *sgl, int nelems,
for_each_sg(sgl, sg, nelems, i) {
sg->dma_address = swiotlb_map_page(dev, sg_page(sg), sg->offset,
sg->length, dir, attrs);
- if (sg->dma_address = DIRECT_MAPPING_ERROR)
+ if (sg->dma_address = DMA_MAPPING_ERROR)
goto out_error;
sg_dma_len(sg) = sg->length;
}
@@ -869,7 +869,6 @@ swiotlb_dma_supported(struct device *hwdev, u64 mask)
}

const struct dma_map_ops swiotlb_dma_ops = {
- .mapping_error = dma_direct_mapping_error,
.alloc = dma_direct_alloc,
.free = dma_direct_free,
.sync_single_for_cpu = swiotlb_sync_single_for_cpu,
--
2.19.1