[PATCH 02/25] hexagon: implement the sync_sg_for_device DMA operation
From: hch@lst.de (Christoph Hellwig)
Date: 2018-05-22 12:05:02
Also in:
linux-alpha, linux-arch, linux-iommu, linux-sh, lkml, sparclinux
Subsystem:
qualcomm hexagon architecture, the rest · Maintainers:
Brian Cain, Linus Torvalds
This methods needs to provide the equivalent of sync_single_for_device for each S/G list element, but was missing. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/hexagon/kernel/dma.c | 13 +++++++++++++ 1 file changed, 13 insertions(+)
diff --git a/arch/hexagon/kernel/dma.c b/arch/hexagon/kernel/dma.c
index d2b717f352f4..9e46556a227d 100644
--- a/arch/hexagon/kernel/dma.c
+++ b/arch/hexagon/kernel/dma.c@@ -188,6 +188,18 @@ static void hexagon_sync_single_for_device(struct device *dev, dma_sync(dma_addr_to_virt(dma_handle), size, dir); } +static void hexagon_sync_sg_for_device(struct device *dev, + struct scatterlist *sgl, int nents, enum dma_data_direction dir) +{ + struct scatterlist *sg; + int i; + + for_each_sg(sgl, sg, nents, i) + hexagon_sync_single_for_device(dev, sg_dma_address(sg), + sg->length, dir); +} + + static int hexagon_mapping_error(struct device *dev, dma_addr_t dma_addr) { return dma_addr == HEXAGON_MAPPING_ERROR;
@@ -199,6 +211,7 @@ const struct dma_map_ops hexagon_dma_ops = { .map_sg = hexagon_map_sg, .map_page = hexagon_map_page, .sync_single_for_device = hexagon_sync_single_for_device, + .sync_sg_for_device = hexagon_sync_sg_for_device, .mapping_error = hexagon_mapping_error, };
--
2.17.0