[PATCH 01/25] hexagon: remove the sync_single_for_cpu DMA operation
From: hch@lst.de (Christoph Hellwig)
Date: 2018-05-22 12:04:52
Also in:
linux-alpha, linux-arch, linux-iommu, linux-sh, lkml, sparclinux
Subsystem:
qualcomm hexagon architecture, the rest · Maintainers:
Brian Cain, Linus Torvalds
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> --- arch/hexagon/kernel/dma.c | 8 -------- 1 file changed, 8 deletions(-)
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index 77459df34e2e..d2b717f352f4 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c@@ -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, };
--
2.17.0