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Subject[PATCH 4/7] x86: add alloc_coherent dma_ops callback to NOMMU driver
Date
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
---
arch/x86/kernel/pci-nommu.c | 38 ++++++++++++++++++++++++++++++++++++++
1 files changed, 38 insertions(+), 0 deletions(-)
diff --git a/arch/x86/kernel/pci-nommu.c b/arch/x86/kernel/pci-nommu.c
index 3f91f71..4d8cde3 100644
--- a/arch/x86/kernel/pci-nommu.c
+++ b/arch/x86/kernel/pci-nommu.c
@@ -72,7 +72,45 @@ static int nommu_map_sg(struct device *hwdev, struct scatterlist *sg,
return nents;
}

+static void *
+nommu_alloc_coherent(struct device *hwdev, size_t size,
+ dma_addr_t *dma_addr, gfp_t gfp)
+{
+ unsigned long dma_mask;
+ int node;
+ struct page *page;
+
+ if (hwdev->dma_mask == NULL)
+ return NULL;
+
+ gfp &= ~(__GFP_DMA | __GFP_HIGHMEM | __GFP_DMA32);
+ gfp |= __GFP_ZERO;
+
+ dma_mask = hwdev->coherent_dma_mask;
+ if (!dma_mask)
+ dma_mask = *(hwdev->dma_mask);
+
+ if (dma_mask <= DMA_24BIT_MASK)
+ gfp |= GFP_DMA;
+ else if (dma_mask <= DMA_32BIT_MASK)
+ gfp |= GFP_DMA32;
+
+ node = dev_to_node(hwdev);
+ page = alloc_pages_node(node, gfp, get_order(size));
+ if (!page)
+ return NULL;
+
+ *dma_addr = page_to_phys(page);
+ if (check_addr("alloc_coherent", hwdev, *dma_addr, size))
+ return page_address(page);
+
+ free_pages((unsigned long)page_address(page), get_order(size));
+
+ return NULL;
+}
+
struct dma_mapping_ops nommu_dma_ops = {
+ .alloc_coherent = nommu_alloc_coherent,
.map_single = nommu_map_single,
.map_sg = nommu_map_sg,
.is_phys = 1,
--
1.5.3.7



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