leandrof/linux
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

AMD IOMMU: add domain unmap function for IOMMU API

Browse Source 
Impact: add a generic function to unmap pages into protection domains

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2008-12-02 19:59:10 +01:00
parent c6229ca649
commit eb74ff6cc0
1 changed files with 41 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

41
arch/x86/kernel/amd_iommu.c
View File

@ -445,6 +445,30 @@ static int iommu_map_page(struct protection_domain *dom,
return 0; return 0;
} }
#ifdef CONFIG_IOMMU_API
static void iommu_unmap_page(struct protection_domain *dom,
unsigned long bus_addr)
{
u64 *pte;
pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
if (!IOMMU_PTE_PRESENT(*pte))
return;
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(bus_addr)];
*pte = 0;
}
#endif
/* /*
* This function checks if a specific unity mapping entry is needed for * This function checks if a specific unity mapping entry is needed for
* this specific IOMMU. * this specific IOMMU.
@ -1747,4 +1771,21 @@ static int amd_iommu_map_range(struct iommu_domain *dom,
return 0; return 0;
} }
static void amd_iommu_unmap_range(struct iommu_domain *dom,
unsigned long iova, size_t size)
{
struct protection_domain *domain = dom->priv;
unsigned long i, npages = iommu_num_pages(iova, size, PAGE_SIZE);
iova &= PAGE_MASK;
for (i = 0; i < npages; ++i) {
iommu_unmap_page(domain, iova);
iova += PAGE_SIZE;
}
iommu_flush_domain(domain->id);
}
#endif #endif