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xtensa: make dma_cache_sync a no-op 

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>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
This commit is contained in:
Christoph Hellwig 2017-08-27 10:27:49 +02:00
parent a535bb8010
commit d708e71ed7
2 changed files with 4 additions and 25 deletions
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6
arch/xtensa/include/asm/dma-mapping.h
View File

@ -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)
{

23
arch/xtensa/kernel/pci-dma.c
View File

@ -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))
{