[PATCH 18/31] nios2: handle page-less SG entries
From: Christoph Hellwig <hch@lst.de>
Date: 2015-08-12 07:14:57
Also in:
linux-alpha, linux-arch, linux-media, linux-mips, linux-s390, lkml, sparclinux
Subsystem:
nios2 architecture, the rest · Maintainers:
Dinh Nguyen, Simon Schuster, Linus Torvalds
Make all cache invalidation conditional on sg_has_page() and use sg_phys to get the physical address directly. Signed-off-by: Christoph Hellwig <hch@lst.de> --- arch/nios2/mm/dma-mapping.c | 29 +++++++++++++++-------------- 1 file changed, 15 insertions(+), 14 deletions(-)
diff --git a/arch/nios2/mm/dma-mapping.c b/arch/nios2/mm/dma-mapping.c
index ac5da75..1a0a68d 100644
--- a/arch/nios2/mm/dma-mapping.c
+++ b/arch/nios2/mm/dma-mapping.c@@ -64,13 +64,11 @@ int dma_map_sg(struct device *dev, struct scatterlist *sg, int nents, BUG_ON(!valid_dma_direction(direction)); for_each_sg(sg, sg, nents, i) { - void *addr; - - addr = sg_virt(sg); - if (addr) { - __dma_sync_for_device(addr, sg->length, direction); - sg->dma_address = sg_phys(sg); + if (sg_has_page(sg)) { + __dma_sync_for_device(sg_virt(sg), sg->length, + direction); } + sg->dma_address = sg_phys(sg); } return nents;
@@ -113,9 +111,8 @@ void dma_unmap_sg(struct device *dev, struct scatterlist *sg, int nhwentries, return; for_each_sg(sg, sg, nhwentries, i) { - addr = sg_virt(sg); - if (addr) - __dma_sync_for_cpu(addr, sg->length, direction); + if (sg_has_page(sg)) + __dma_sync_for_cpu(sg_virt(sg), sg->length, direction); } } EXPORT_SYMBOL(dma_unmap_sg);
@@ -166,8 +163,10 @@ void dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sg, int nelems, BUG_ON(!valid_dma_direction(direction)); /* Make sure that gcc doesn't leave the empty loop body. */ - for_each_sg(sg, sg, nelems, i) - __dma_sync_for_cpu(sg_virt(sg), sg->length, direction); + for_each_sg(sg, sg, nelems, i) { + if (sg_has_page(sg)) + __dma_sync_for_cpu(sg_virt(sg), sg->length, direction); + } } EXPORT_SYMBOL(dma_sync_sg_for_cpu);
@@ -179,8 +178,10 @@ void dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg, BUG_ON(!valid_dma_direction(direction)); /* Make sure that gcc doesn't leave the empty loop body. */ - for_each_sg(sg, sg, nelems, i) - __dma_sync_for_device(sg_virt(sg), sg->length, direction); - + for_each_sg(sg, sg, nelems, i) { + if (sg_has_page(sg)) + __dma_sync_for_device(sg_virt(sg), sg->length, + direction); + } } EXPORT_SYMBOL(dma_sync_sg_for_device);
--
1.9.1