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x86/amd-iommu: Make fetch_pte aware of dynamic mapping levels

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This patch changes the fetch_pte function in the AMD IOMMU
driver to support dynamic mapping levels.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel
2009-09-02 14:24:08 +02:00
parent 37d0892c5a
commit 9355a08186
2 changed files with 22 additions and 11 deletions
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24
arch/x86/kernel/amd_iommu.c
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@@ -61,6 +61,8 @@ static u64* alloc_pte(struct protection_domain *dom,
static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
unsigned long start_page,
unsigned int pages);
static u64 *fetch_pte(struct protection_domain *domain,
unsigned long address);
#ifndef BUS_NOTIFY_UNBOUND_DRIVER
#define BUS_NOTIFY_UNBOUND_DRIVER 0x0005
@@ -670,24 +672,24 @@ static int init_unity_mappings_for_device(struct dma_ops_domain *dma_dom,
* This function checks if there is a PTE for a given dma address. If
* there is one, it returns the pointer to it.
*/
static u64* fetch_pte(struct protection_domain *domain,
static u64 *fetch_pte(struct protection_domain *domain,
unsigned long address)
{
int level;
u64 *pte;
pte = &domain->pt_root[IOMMU_PTE_L2_INDEX(address)];
level = domain->mode - 1;
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
if (!IOMMU_PTE_PRESENT(*pte))
return NULL;
while (level > 0) {
if (!IOMMU_PTE_PRESENT(*pte))
return NULL;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(address)];
level -= 1;
if (!IOMMU_PTE_PRESENT(*pte))
return NULL;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L0_INDEX(address)];
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[PM_LEVEL_INDEX(level, address)];
}
return pte;
}