[PATCH 29/31] parisc: handle page-less SG entries

Christoph Hellwig
2015-08-12T07:05:48Z

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