These functions should perform the same cache synchronoization as calling
arc_dma_sync_single_for_{cpu,device} in addition to doing any required
address translation or mapping [1]. Ensure they actually do that by calling
arc_dma_sync_single_for_{cpu,device} instead of passing the dir argument
along to _dma_cache_sync.
The now unused _dma_cache_sync function is removed as well.
[1] in fact various drivers rely on that by passing DMA_ATTR_SKIP_CPU_SYNC
to the map/unmap routines and doing the cache synchronization manually.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
arch/arc/mm/dma.c | 27 ++-------------------------
1 file changed, 2 insertions(+), 25 deletions(-)
diff --git a/arch/arc/mm/dma.c b/arch/arc/mm/dma.c
index eafdbd2ad20a..08d91c13ac52 100644
--- a/arch/arc/mm/dma.c
+++ b/arch/arc/mm/dma.c
@@ -130,29 +130,6 @@ static int arc_dma_mmap(struct device *dev, struct
vm_area_struct *vma,
return ret;
}
-/*
- * streaming DMA Mapping API...
- * CPU accesses page via normal paddr, thus needs to explicitly made
- * consistent before each use
- */
-static void _dma_cache_sync(phys_addr_t paddr, size_t size,
- enum dma_data_direction dir)
-{
- switch (dir) {
- case DMA_FROM_DEVICE:
- dma_cache_inv(paddr, size);
- break;
- case DMA_TO_DEVICE:
- dma_cache_wback(paddr, size);
- break;
- case DMA_BIDIRECTIONAL:
- dma_cache_wback_inv(paddr, size);
- break;
- default:
- pr_err("Invalid DMA dir [%d] for OP @ %pa[p]\n", dir, &paddr);
- }
-}
-
static void arc_dma_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size, enum dma_data_direction dir)
{
@@ -185,7 +162,7 @@ static dma_addr_t arc_dma_map_page(struct device *dev,
struct page *page,
phys_addr_t paddr = page_to_phys(page) + offset;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- _dma_cache_sync(paddr, size, dir);
+ arc_dma_sync_single_for_device(dev, paddr, size, dir);
return paddr;
}
@@ -205,7 +182,7 @@ static void arc_dma_unmap_page(struct device *dev,
dma_addr_t handle,
phys_addr_t paddr = handle;
if (!(attrs & DMA_ATTR_SKIP_CPU_SYNC))
- _dma_cache_sync(paddr, size, dir);
+ arc_dma_sync_single_for_cpu(dev, paddr, size, dir);
}
static int arc_dma_map_sg(struct device *dev, struct scatterlist *sg,
--
2.17.0
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