[PATCH 29/31] parisc: handle page-less SG entries
From: Christoph Hellwig <hch@lst.de>
Date: 2015-08-12 07:10:15
Also in:
linux-alpha, linux-media, linux-mips, linux-s390, linuxppc-dev, lkml, sparclinux
Subsystem:
parisc architecture, the rest · Maintainers:
"James E.J. Bottomley", Helge Deller, 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/parisc/kernel/pci-dma.c | 29 ++++++++++++++++++----------- 1 file changed, 18 insertions(+), 11 deletions(-)
diff --git a/arch/parisc/kernel/pci-dma.c b/arch/parisc/kernel/pci-dma.c
index b9402c9..6cad0e0 100644
--- a/arch/parisc/kernel/pci-dma.c
+++ b/arch/parisc/kernel/pci-dma.c@@ -483,11 +483,13 @@ static int pa11_dma_map_sg(struct device *dev, struct scatterlist *sglist, int n BUG_ON(direction == DMA_NONE); for_each_sg(sglist, sg, nents, i) { - unsigned long vaddr = (unsigned long)sg_virt(sg); - - sg_dma_address(sg) = (dma_addr_t) virt_to_phys(vaddr); + sg_dma_address(sg) = sg_phys(sg); sg_dma_len(sg) = sg->length; - flush_kernel_dcache_range(vaddr, sg->length); + + if (sg_has_page(sg)) { + flush_kernel_dcache_range((unsigned long)sg_virt(sg), + sg->length); + } } return nents; }
@@ -504,9 +506,10 @@ static void pa11_dma_unmap_sg(struct device *dev, struct scatterlist *sglist, in /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for_each_sg(sglist, sg, nents, i) - flush_kernel_vmap_range(sg_virt(sg), sg->length); - return; + for_each_sg(sglist, sg, nents, i) { + if (sg_has_page(sg)) + flush_kernel_vmap_range(sg_virt(sg), sg->length); + } } static void pa11_dma_sync_single_for_cpu(struct device *dev, dma_addr_t dma_handle, unsigned long offset, size_t size, enum dma_data_direction direction)
@@ -530,8 +533,10 @@ static void pa11_dma_sync_sg_for_cpu(struct device *dev, struct scatterlist *sgl /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for_each_sg(sglist, sg, nents, i) - flush_kernel_vmap_range(sg_virt(sg), sg->length); + for_each_sg(sglist, sg, nents, i) { + if (sg_has_page(sg)) + flush_kernel_vmap_range(sg_virt(sg), sg->length); + } } static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sglist, int nents, enum dma_data_direction direction)
@@ -541,8 +546,10 @@ static void pa11_dma_sync_sg_for_device(struct device *dev, struct scatterlist * /* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */ - for_each_sg(sglist, sg, nents, i) - flush_kernel_vmap_range(sg_virt(sg), sg->length); + for_each_sg(sglist, sg, nents, i) { + if (sg_has_page(sg)) + flush_kernel_vmap_range(sg_virt(sg), sg->length); + } } struct hppa_dma_ops pcxl_dma_ops = {
--
1.9.1