Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit a535bb80 authored by Christoph Hellwig's avatar Christoph Hellwig
Browse files

unicore32: make dma_cache_sync a no-op 



unicore32 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: default avatarChristoph Hellwig <hch@lst.de>
Reviewed-by: default avatarRobin Murphy <robin.murphy@arm.com>
parent 87f62634

arch/unicore32/include/asm/cacheflush.h

+0 −9
Original line number Diff line number Diff line
@@ -101,15 +101,6 @@ extern void __cpuc_coherent_user_range(unsigned long, unsigned long); 
extern void __cpuc_flush_dcache_area(void *, size_t);

extern void __cpuc_flush_kern_dcache_area(void *addr, size_t size);



/*

 * These are private to the dma-mapping API.  Do not use directly.

 * Their sole purpose is to ensure that data held in the cache

 * is visible to DMA, or data written by DMA to system memory is

 * visible to the CPU.

 */

extern void __cpuc_dma_clean_range(unsigned long, unsigned long);

extern void __cpuc_dma_flush_range(unsigned long, unsigned long);



/*

 * Copy user data from/to a page which is mapped into a different

 * processes address space.  Really, we want to allow our "user

arch/unicore32/include/asm/dma-mapping.h

+0 −17
Original line number Diff line number Diff line
@@ -18,9 +18,6 @@ 
#include <linux/scatterlist.h>

#include <linux/swiotlb.h>



#include <asm/memory.h>

#include <asm/cacheflush.h>



extern const struct dma_map_ops swiotlb_dma_map_ops;



static inline const struct dma_map_ops *get_arch_dma_ops(struct bus_type *bus)
@@ -51,20 +48,6 @@ static inline void dma_mark_clean(void *addr, size_t size) {} 
static inline void dma_cache_sync(struct device *dev, void *vaddr,

		size_t size, enum dma_data_direction direction)

{

	unsigned long start = (unsigned long)vaddr;

	unsigned long end   = start + size;



	switch (direction) {

	case DMA_NONE:

		BUG();

	case DMA_FROM_DEVICE:

	case DMA_BIDIRECTIONAL:	/* writeback and invalidate */

		__cpuc_dma_flush_range(start, end);

		break;

	case DMA_TO_DEVICE:		/* writeback only */

		__cpuc_dma_clean_range(start, end);

		break;

	}

}



#endif /* __KERNEL__ */

arch/unicore32/mm/proc-syms.c

+0 −3
Original line number Diff line number Diff line
@@ -20,6 +20,3 @@ EXPORT_SYMBOL(cpu_dcache_clean_area); 
EXPORT_SYMBOL(cpu_set_pte);



EXPORT_SYMBOL(__cpuc_coherent_kern_range);
 


EXPORT_SYMBOL(__cpuc_dma_flush_range);

EXPORT_SYMBOL(__cpuc_dma_clean_range);