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sh: make dma_cache_sync a no-op

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sh 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.

On the other hand sh uses dma_cache_sync internally in the dma_ops
implementation and for the maple bus that does not use the DMA API,
so a the old functionality for dma_cache_sync is still provided under
the name sh_sync_dma_for_device, and without the redundant dev
argument.  While at it two of the syncing dma_ops also go the proper
_for_device postfix.

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 10:35:40 +02:00
parent d708e71ed7
commit e0c6584df9
4 changed files with 21 additions and 16 deletions
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9
arch/sh/include/asm/dma-mapping.h
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@@ -9,8 +9,10 @@ static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
return dma_ops;
}
void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir);
static inline void dma_cache_sync(struct device *dev, void *vaddr, size_t size,
enum dma_data_direction dir)
{
}
/* arch/sh/mm/consistent.c */
extern void *dma_generic_alloc_coherent(struct device *dev, size_t size,
@@ -20,4 +22,7 @@ extern void dma_generic_free_coherent(struct device *dev, size_t size,
void *vaddr, dma_addr_t dma_handle,
unsigned long attrs);
void sh_sync_dma_for_device(void *vaddr, size_t size,
enum dma_data_direction dir);
#endif /* __ASM_SH_DMA_MAPPING_H */