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x86, AMD IOMMU: add generic dma_ops mapping functions 

This patch adds the generic functions to map and unmap pages to a protection
domain for dma_ops usage.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
Cc: iommu@lists.linux-foundation.org
Cc: bhavna.sarathy@amd.com
Cc: Sebastian.Biemueller@amd.com
Cc: robert.richter@amd.com
Cc: joro@8bytes.org
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Joerg Roedel 2008-06-26 21:28:00 +02:00 committed by Ingo Molnar
parent b20ac0d4d6
commit cb76c32297
1 changed files with 105 additions and 0 deletions
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105
arch/x86/kernel/amd_iommu.c
View File

@ -536,3 +536,108 @@ static int get_device_resources(struct device *dev,
return 1;
}
static dma_addr_t dma_ops_domain_map(struct amd_iommu *iommu,
struct dma_ops_domain *dom,
unsigned long address,
phys_addr_t paddr,
int direction)
{
u64 *pte, __pte;
WARN_ON(address > dom->aperture_size);
paddr &= PAGE_MASK;
pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
pte += IOMMU_PTE_L0_INDEX(address);
__pte = paddr | IOMMU_PTE_P | IOMMU_PTE_FC;
if (direction == DMA_TO_DEVICE)
__pte |= IOMMU_PTE_IR;
else if (direction == DMA_FROM_DEVICE)
__pte |= IOMMU_PTE_IW;
else if (direction == DMA_BIDIRECTIONAL)
__pte |= IOMMU_PTE_IR | IOMMU_PTE_IW;
WARN_ON(*pte);
*pte = __pte;
return (dma_addr_t)address;
}
static void dma_ops_domain_unmap(struct amd_iommu *iommu,
struct dma_ops_domain *dom,
unsigned long address)
{
u64 *pte;
if (address >= dom->aperture_size)
return;
WARN_ON(address & 0xfffULL || address > dom->aperture_size);
pte = dom->pte_pages[IOMMU_PTE_L1_INDEX(address)];
pte += IOMMU_PTE_L0_INDEX(address);
WARN_ON(!*pte);
*pte = 0ULL;
}
static dma_addr_t __map_single(struct device *dev,
struct amd_iommu *iommu,
struct dma_ops_domain *dma_dom,
phys_addr_t paddr,
size_t size,
int dir)
{
dma_addr_t offset = paddr & ~PAGE_MASK;
dma_addr_t address, start;
unsigned int pages;
int i;
pages = to_pages(paddr, size);
paddr &= PAGE_MASK;
address = dma_ops_alloc_addresses(dev, dma_dom, pages);
if (unlikely(address == bad_dma_address))
goto out;
start = address;
for (i = 0; i < pages; ++i) {
dma_ops_domain_map(iommu, dma_dom, start, paddr, dir);
paddr += PAGE_SIZE;
start += PAGE_SIZE;
}
address += offset;
out:
return address;
}
static void __unmap_single(struct amd_iommu *iommu,
struct dma_ops_domain *dma_dom,
dma_addr_t dma_addr,
size_t size,
int dir)
{
dma_addr_t i, start;
unsigned int pages;
if ((dma_addr == 0) || (dma_addr + size > dma_dom->aperture_size))
return;
pages = to_pages(dma_addr, size);
dma_addr &= PAGE_MASK;
start = dma_addr;
for (i = 0; i < pages; ++i) {
dma_ops_domain_unmap(iommu, dma_dom, start);
start += PAGE_SIZE;
}
dma_ops_free_addresses(dma_dom, dma_addr, pages);
}