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x86/amd-iommu: Change alloc_pte to support 64 bit address space

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This patch changes the alloc_pte function to be able to map
pages into the whole 64 bit address space supported by AMD
IOMMU hardware from the old limit of 2**39 bytes.

Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>
This commit is contained in:
Joerg Roedel 2009-09-02 16:48:40 +02:00
parent 50020fb632
commit 8bc3e12742
1 changed files with 24 additions and 28 deletions
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52
arch/x86/kernel/amd_iommu.c
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@ -55,7 +55,7 @@ struct iommu_cmd {
static int dma_ops_unity_map(struct dma_ops_domain *dma_dom,
struct unity_map_entry *e);
static struct dma_ops_domain *find_protection_domain(u16 devid);
static u64* alloc_pte(struct protection_domain *dom,
static u64 *alloc_pte(struct protection_domain *domain,
unsigned long address, u64
**pte_page, gfp_t gfp);
static void dma_ops_reserve_addresses(struct dma_ops_domain *dom,
@ -1351,40 +1351,36 @@ static bool increase_address_space(struct protection_domain *domain,
return true;
}
/*
* If the pte_page is not yet allocated this function is called
*/
static u64* alloc_pte(struct protection_domain *dom,
static u64 *alloc_pte(struct protection_domain *domain,
unsigned long address, u64 **pte_page, gfp_t gfp)
{
u64 *pte, *page;
int level;
pte = &dom->pt_root[IOMMU_PTE_L2_INDEX(address)];
while (address > PM_LEVEL_SIZE(domain->mode))
increase_address_space(domain, gfp);
if (!IOMMU_PTE_PRESENT(*pte)) {
page = (u64 *)get_zeroed_page(gfp);
if (!page)
return NULL;
*pte = IOMMU_L2_PDE(virt_to_phys(page));
level = domain->mode - 1;
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
while (level > 0) {
if (!IOMMU_PTE_PRESENT(*pte)) {
page = (u64 *)get_zeroed_page(gfp);
if (!page)
return NULL;
*pte = PM_LEVEL_PDE(level, virt_to_phys(page));
}
level -= 1;
pte = IOMMU_PTE_PAGE(*pte);
if (pte_page && level == 0)
*pte_page = pte;
pte = &pte[PM_LEVEL_INDEX(level, address)];
}
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[IOMMU_PTE_L1_INDEX(address)];
if (!IOMMU_PTE_PRESENT(*pte)) {
page = (u64 *)get_zeroed_page(gfp);
if (!page)
return NULL;
*pte = IOMMU_L1_PDE(virt_to_phys(page));
}
pte = IOMMU_PTE_PAGE(*pte);
if (pte_page)
*pte_page = pte;
pte = &pte[IOMMU_PTE_L0_INDEX(address)];
return pte;
}