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Subject[PATCH 09/11] xtensa: make dma_cache_sync a no-op
Date
xtensa does not implement DMA_ATTR_NON_CONSISTENT allocations, so it
doesn't make any sense to do any work in dma_cache_sync given that it
must be a no-op when dma_alloc_attrs returns coherent memory.

Signed-off-by: Christoph Hellwig <hch@lst.de>
---
arch/xtensa/include/asm/dma-mapping.h | 6 ++++--
arch/xtensa/kernel/pci-dma.c | 23 -----------------------
2 files changed, 4 insertions(+), 25 deletions(-)

diff --git a/arch/xtensa/include/asm/dma-mapping.h b/arch/xtensa/include/asm/dma-mapping.h
index 269738dc9d1d..353e0314d6ba 100644
--- a/arch/xtensa/include/asm/dma-mapping.h
+++ b/arch/xtensa/include/asm/dma-mapping.h
@@ -23,8 +23,10 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return &xtensa_dma_map_ops;
}

-void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
- enum dma_data_direction direction);
+static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
+ enum dma_data_direction direction)
+{
+}

static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr)
{
diff --git a/arch/xtensa/kernel/pci-dma.c b/arch/xtensa/kernel/pci-dma.c
index cec86a1c2acc..623720a11143 100644
--- a/arch/xtensa/kernel/pci-dma.c
+++ b/arch/xtensa/kernel/pci-dma.c
@@ -26,29 +26,6 @@
#include <asm/cacheflush.h>
#include <asm/io.h>

-void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
- enum dma_data_direction dir)
-{
- switch (dir) {
- case DMA_BIDIRECTIONAL:
- __flush_invalidate_dcache_range((unsigned long)vaddr, size);
- break;
-
- case DMA_FROM_DEVICE:
- __invalidate_dcache_range((unsigned long)vaddr, size);
- break;
-
- case DMA_TO_DEVICE:
- __flush_dcache_range((unsigned long)vaddr, size);
- break;
-
- case DMA_NONE:
- BUG();
- break;
- }
-}
-EXPORT_SYMBOL(dma_cache_sync);
-
static void do_cache_op(dma_addr_t dma_handle, size_t size,
void (*fn)(unsigned long, unsigned long))
{
--
2.14.1
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