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x86, calgary: add map_page and unmap_page

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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>
This commit is contained in:
FUJITA Tomonori 2009-01-05 23:47:24 +09:00 committed by Ingo Molnar
parent 052aedbfb6
commit 3991605c40
1 changed files with 27 additions and 8 deletions
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35
arch/x86/kernel/pci-calgary_64.c
View file

@ -445,10 +445,12 @@ static int calgary_map_sg(struct device *dev, struct scatterlist *sg,
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 @@ static dma_addr_t calgary_map_single(struct device *dev, phys_addr_t paddr,
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 @@ static struct dma_mapping_ops calgary_dma_ops = {
.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)