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x86/amd-iommu: Introduce increase_address_space function 

This function will be used to increase the address space
size of a protection domain.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-09-02 15:38:40 +02:00
parent 04bfdd8406
commit 50020fb632
2 changed files with 31 additions and 0 deletions
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4
arch/x86/include/asm/amd_iommu_types.h
View File

@ -160,6 +160,10 @@
((1ULL << PM_LEVEL_SHIFT((x))) - 1): \
(0xffffffffffffffffULL))
#define PM_LEVEL_INDEX(x, a) (((a) >> PM_LEVEL_SHIFT((x))) & 0x1ffULL)
#define PM_LEVEL_ENC(x) (((x) << 9) & 0xe00ULL)
#define PM_LEVEL_PDE(x, a) ((a) | PM_LEVEL_ENC((x)) | \
IOMMU_PTE_P | IOMMU_PTE_IR | IOMMU_PTE_IW)
#define IOMMU_PTE_L2_INDEX(address) (((address) >> 30) & 0x1ffULL)
#define IOMMU_PTE_L1_INDEX(address) (((address) >> 21) & 0x1ffULL)

27
arch/x86/kernel/amd_iommu.c
View File

@ -1324,6 +1324,33 @@ static void update_domain(struct protection_domain *domain)
domain->updated = false;
}
/*
* This function is used to add another level to an IO page table. Adding
* another level increases the size of the address space by 9 bits to a size up
* to 64 bits.
*/
static bool increase_address_space(struct protection_domain *domain,
gfp_t gfp)
{
u64 *pte;
if (domain->mode == PAGE_MODE_6_LEVEL)
/* address space already 64 bit large */
return false;
pte = (void *)get_zeroed_page(gfp);
if (!pte)
return false;
*pte = PM_LEVEL_PDE(domain->mode,
virt_to_phys(domain->pt_root));
domain->pt_root = pte;
domain->mode += 1;
domain->updated = true;
return true;
}
/*
* If the pte_page is not yet allocated this function is called
*/