x86, calgary: add map_page and unmap_page
This is a preparation of struct dma_mapping_ops unification. We use
map_page and unmap_page instead of map_single and unmap_single.
We will remove map_single and unmap_single hooks in the last patch in
this patchset.
Signed-off-by: FUJITA Tomonori <fujita.tomonori@lab.ntt.co.jp>
Acked-by: Muli Ben-Yehuda <muli@il.ibm.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
diff --git a/arch/x86/kernel/pci-calgary_64.c b/arch/x86/kernel/pci-calgary_64.c
index d28bbdc..e33cfcf 100644
--- a/arch/x86/kernel/pci-calgary_64.c
+++ b/arch/x86/kernel/pci-calgary_64.c
@@ -445,10 +445,12 @@
return 0;
}
-static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
- size_t size, int direction)
+static dma_addr_t calgary_map_page(struct device *dev, struct page *page,
+ unsigned long offset, size_t size,
+ enum dma_data_direction dir,
+ struct dma_attrs *attrs)
{
- void *vaddr = phys_to_virt(paddr);
+ void *vaddr = page_address(page) + offset;
unsigned long uaddr;
unsigned int npages;
struct iommu_table *tbl = find_iommu_table(dev);
@@ -456,17 +458,32 @@
uaddr = (unsigned long)vaddr;
npages = iommu_num_pages(uaddr, size, PAGE_SIZE);
- return iommu_alloc(dev, tbl, vaddr, npages, direction);
+ return iommu_alloc(dev, tbl, vaddr, npages, dir);
}
-static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
- size_t size, int direction)
+static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
+ size_t size, int direction)
+{
+ return calgary_map_page(dev, pfn_to_page(paddr >> PAGE_SHIFT),
+ paddr & ~PAGE_MASK, size,
+ direction, NULL);
+}
+
+static void calgary_unmap_page(struct device *dev, dma_addr_t dma_addr,
+ size_t size, enum dma_data_direction dir,
+ struct dma_attrs *attrs)
{
struct iommu_table *tbl = find_iommu_table(dev);
unsigned int npages;
- npages = iommu_num_pages(dma_handle, size, PAGE_SIZE);
- iommu_free(tbl, dma_handle, npages);
+ npages = iommu_num_pages(dma_addr, size, PAGE_SIZE);
+ iommu_free(tbl, dma_addr, npages);
+}
+
+static void calgary_unmap_single(struct device *dev, dma_addr_t dma_handle,
+ size_t size, int direction)
+{
+ calgary_unmap_page(dev, dma_handle, size, direction, NULL);
}
static void* calgary_alloc_coherent(struct device *dev, size_t size,
@@ -522,6 +539,8 @@
.unmap_single = calgary_unmap_single,
.map_sg = calgary_map_sg,
.unmap_sg = calgary_unmap_sg,
+ .map_page = calgary_map_page,
+ .unmap_page = calgary_unmap_page,
};
static inline void __iomem * busno_to_bbar(unsigned char num)