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hexagon: remove the sync_single_for_cpu DMA operation 

hexagon does all the required cache maintainance at dma map time, and none
at unmap time.  It thus has to implement sync_single_for_device to match
the map cace for buffer reuse, but there is no point in doing another
invalidation in the sync_single_cpu_case, which in terms of cache
maintainance is equivalent to the unmap case.

Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-05-19 08:55:39 +02:00
parent d7b686ebf7
commit 37fca4bd01
1 changed files with 0 additions and 8 deletions
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8
arch/hexagon/kernel/dma.c
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@ -181,13 +181,6 @@ static dma_addr_t hexagon_map_page(struct device *dev, struct page *page,
return bus;
}
static void hexagon_sync_single_for_cpu(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
{
dma_sync(dma_addr_to_virt(dma_handle), size, dir);
}
static void hexagon_sync_single_for_device(struct device *dev,
dma_addr_t dma_handle, size_t size,
enum dma_data_direction dir)
@ -205,7 +198,6 @@ const struct dma_map_ops hexagon_dma_ops = {
.free = hexagon_free_coherent,
.map_sg = hexagon_map_sg,
.map_page = hexagon_map_page,
.sync_single_for_cpu = hexagon_sync_single_for_cpu,
.sync_single_for_device = hexagon_sync_single_for_device,
.mapping_error = hexagon_mapping_error,
};