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| author | Christoph Hellwig <hch@lst.de> | 2018-07-19 06:02:29 -0700 |
|---|---|---|
| committer | Stafford Horne <shorne@gmail.com> | 2018-07-21 13:49:48 +0900 |
| commit | 1902cbcc8ba16b5481bd7d3d7759f471a6829842 (patch) | |
| tree | 666295d9ff6eacd145dee515b14a08f78cf0973e | |
| parent | 1e4b044d22517cae7047c99038abb444423243ca (diff) | |
| download | linux-stable-1902cbcc8ba16b5481bd7d3d7759f471a6829842.tar.gz linux-stable-1902cbcc8ba16b5481bd7d3d7759f471a6829842.tar.bz2 linux-stable-1902cbcc8ba16b5481bd7d3d7759f471a6829842.zip | |
openrisc: remove the sync_single_for_cpu DMA operation
openrisc 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>
Signed-off-by: Stafford Horne <shorne@gmail.com>
| -rw-r--r-- | arch/openrisc/kernel/dma.c | 15 |
1 files changed, 0 insertions, 15 deletions
diff --git a/arch/openrisc/kernel/dma.c b/arch/openrisc/kernel/dma.c index ec7fd45704d2..47601274abf7 100644 --- a/arch/openrisc/kernel/dma.c +++ b/arch/openrisc/kernel/dma.c @@ -209,20 +209,6 @@ or1k_unmap_sg(struct device *dev, struct scatterlist *sg, } static void -or1k_sync_single_for_cpu(struct device *dev, - dma_addr_t dma_handle, size_t size, - enum dma_data_direction dir) -{ - unsigned long cl; - dma_addr_t addr = dma_handle; - struct cpuinfo_or1k *cpuinfo = &cpuinfo_or1k[smp_processor_id()]; - - /* Invalidate the dcache for the requested range */ - for (cl = addr; cl < addr + size; cl += cpuinfo->dcache_block_size) - mtspr(SPR_DCBIR, cl); -} - -static void or1k_sync_single_for_device(struct device *dev, dma_addr_t dma_handle, size_t size, enum dma_data_direction dir) @@ -243,7 +229,6 @@ const struct dma_map_ops or1k_dma_map_ops = { .unmap_page = or1k_unmap_page, .map_sg = or1k_map_sg, .unmap_sg = or1k_unmap_sg, - .sync_single_for_cpu = or1k_sync_single_for_cpu, .sync_single_for_device = or1k_sync_single_for_device, }; EXPORT_SYMBOL(or1k_dma_map_ops); |