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iommu/amd: Return the pte page-size in fetch_pte 

Extend the fetch_pte function to also return the page-size
that is mapped by the returned pte.

Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
Joerg Roedel 2015-04-01 14:58:48 +02:00
parent 3b839a5799
commit 3039ca1b1c
2 changed files with 36 additions and 22 deletions
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52
drivers/iommu/amd_iommu.c
View File

@ -1322,7 +1322,9 @@ static u64 *alloc_pte(struct protection_domain *domain,
* 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, unsigned long address)
static u64 *fetch_pte(struct protection_domain *domain,
unsigned long address,
unsigned long *page_size)
{
int level;
u64 *pte;
@ -1330,8 +1332,9 @@ static u64 *fetch_pte(struct protection_domain *domain, unsigned long address)
if (address > PM_LEVEL_SIZE(domain->mode))
return NULL;
level = domain->mode - 1;
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
level = domain->mode - 1;
pte = &domain->pt_root[PM_LEVEL_INDEX(level, address)];
*page_size = PTE_LEVEL_PAGE_SIZE(level);
while (level > 0) {
@ -1340,19 +1343,9 @@ static u64 *fetch_pte(struct protection_domain *domain, unsigned long address)
return NULL;
/* Large PTE */
if (PM_PTE_LEVEL(*pte) == 0x07) {
unsigned long pte_mask, __pte;
/*
* If we have a series of large PTEs, make
* sure to return a pointer to the first one.
*/
pte_mask = PTE_PAGE_SIZE(*pte);
pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
__pte = ((unsigned long)pte) & pte_mask;
return (u64 *)__pte;
}
if (PM_PTE_LEVEL(*pte) == 7 ||
PM_PTE_LEVEL(*pte) == 0)
break;
/* No level skipping support yet */
if (PM_PTE_LEVEL(*pte) != level)
@ -1361,8 +1354,21 @@ static u64 *fetch_pte(struct protection_domain *domain, unsigned long address)
level -= 1;
/* Walk to the next level */
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[PM_LEVEL_INDEX(level, address)];
pte = IOMMU_PTE_PAGE(*pte);
pte = &pte[PM_LEVEL_INDEX(level, address)];
*page_size = PTE_LEVEL_PAGE_SIZE(level);
}
if (PM_PTE_LEVEL(*pte) == 0x07) {
unsigned long pte_mask;
/*
* If we have a series of large PTEs, make
* sure to return a pointer to the first one.
*/
*page_size = pte_mask = PTE_PAGE_SIZE(*pte);
pte_mask = ~((PAGE_SIZE_PTE_COUNT(pte_mask) << 3) - 1);
pte = (u64 *)(((unsigned long)pte) & pte_mask);
}
return pte;
@ -1423,6 +1429,7 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom,
unsigned long page_size)
{
unsigned long long unmap_size, unmapped;
unsigned long pte_pgsize;
u64 *pte;
BUG_ON(!is_power_of_2(page_size));
@ -1431,7 +1438,7 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom,
while (unmapped < page_size) {
pte = fetch_pte(dom, bus_addr);
pte = fetch_pte(dom, bus_addr, &pte_pgsize);
if (!pte) {
/*
@ -1674,7 +1681,8 @@ static int alloc_new_range(struct dma_ops_domain *dma_dom,
for (i = dma_dom->aperture[index]->offset;
i < dma_dom->aperture_size;
i += PAGE_SIZE) {
u64 *pte = fetch_pte(&dma_dom->domain, i);
unsigned long pte_pgsize;
u64 *pte = fetch_pte(&dma_dom->domain, i, &pte_pgsize);
if (!pte || !IOMMU_PTE_PRESENT(*pte))
continue;
@ -3382,14 +3390,14 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
dma_addr_t iova)
{
struct protection_domain *domain = dom->priv;
unsigned long offset_mask;
unsigned long offset_mask, pte_pgsize;
phys_addr_t paddr;
u64 *pte, __pte;
if (domain->mode == PAGE_MODE_NONE)
return iova;
pte = fetch_pte(domain, iova);
pte = fetch_pte(domain, iova, &pte_pgsize);
if (!pte || !IOMMU_PTE_PRESENT(*pte))
return 0;

6
drivers/iommu/amd_iommu_types.h
View File

@ -282,6 +282,12 @@
#define PTE_PAGE_SIZE(pte) \
(1ULL << (1 + ffz(((pte) | 0xfffULL))))
/*
* Takes a page-table level and returns the default page-size for this level
*/
#define PTE_LEVEL_PAGE_SIZE(level) \
(1ULL << (12 + (9 * (level))))
#define IOMMU_PTE_P (1ULL << 0)
#define IOMMU_PTE_TV (1ULL << 1)
#define IOMMU_PTE_U (1ULL << 59)