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x86, AMD IOMMU: 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>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
FUJITA Tomonori 2009-01-05 23:47:25 +09:00 committed by Ingo Molnar
parent 3991605c40
commit 51491367c2
1 changed files with 23 additions and 4 deletions
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27
arch/x86/kernel/amd_iommu.c
View File

@ -22,6 +22,7 @@
#include <linux/bitops.h>
#include <linux/debugfs.h>
#include <linux/scatterlist.h>
#include <linux/dma-mapping.h>
#include <linux/iommu-helper.h>
#ifdef CONFIG_IOMMU_API
#include <linux/iommu.h>
@ -1297,8 +1298,10 @@ static void __unmap_single(struct amd_iommu *iommu,
/*
* The exported map_single function for dma_ops.
*/
static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
size_t size, int dir)
static dma_addr_t map_page(struct device *dev, struct page *page,
unsigned long offset, size_t size,
enum dma_data_direction dir,
struct dma_attrs *attrs)
{
unsigned long flags;
struct amd_iommu *iommu;
@ -1306,6 +1309,7 @@ static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
u16 devid;
dma_addr_t addr;
u64 dma_mask;
phys_addr_t paddr = page_to_phys(page) + offset;
INC_STATS_COUNTER(cnt_map_single);
@ -1337,11 +1341,18 @@ out:
return addr;
}
static dma_addr_t map_single(struct device *dev, phys_addr_t paddr,
size_t size, int dir)
{
return map_page(dev, pfn_to_page(paddr >> PAGE_SHIFT),
paddr & ~PAGE_MASK, size, dir, NULL);
}
/*
* The exported unmap_single function for dma_ops.
*/
static void unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size, int dir)
static void unmap_page(struct device *dev, dma_addr_t dma_addr, size_t size,
enum dma_data_direction dir, struct dma_attrs *attrs)
{
unsigned long flags;
struct amd_iommu *iommu;
@ -1367,6 +1378,12 @@ static void unmap_single(struct device *dev, dma_addr_t dma_addr,
spin_unlock_irqrestore(&domain->lock, flags);
}
static void unmap_single(struct device *dev, dma_addr_t dma_addr,
size_t size, int dir)
{
return unmap_page(dev, dma_addr, size, dir, NULL);
}
/*
* This is a special map_sg function which is used if we should map a
* device which is not handled by an AMD IOMMU in the system.
@ -1649,6 +1666,8 @@ static struct dma_mapping_ops amd_iommu_dma_ops = {
.free_coherent = free_coherent,
.map_single = map_single,
.unmap_single = unmap_single,
.map_page = map_page,
.unmap_page = unmap_page,
.map_sg = map_sg,
.unmap_sg = unmap_sg,
.dma_supported = amd_iommu_dma_supported,