diff options
| author | Joerg Roedel <jroedel@suse.de> | 2015-04-01 14:58:49 +0200 |
|---|---|---|
| committer | Joerg Roedel <jroedel@suse.de> | 2015-04-02 13:31:07 +0200 |
| commit | 71b390e9bec5121d25c45326ff0b0b96a143f9a8 (patch) | |
| tree | caaec5e9629798ee60ad5ac13fa56415ff7cb62a /drivers/iommu | |
| parent | iommu/amd: Return the pte page-size in fetch_pte (diff) | |
| download | linux-71b390e9bec5121d25c45326ff0b0b96a143f9a8.tar.xz linux-71b390e9bec5121d25c45326ff0b0b96a143f9a8.zip | |
iommu/amd: Optimize iommu_unmap_page for new fetch_pte interface
Now that fetch_pte returns the page-size of the pte, this
function can be optimized a lot.
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>
Diffstat (limited to 'drivers/iommu')
| -rw-r--r-- | drivers/iommu/amd_iommu.c | 32 |
1 files changed, 8 insertions, 24 deletions
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c index 24ef9e600289..c9ee444d8209 100644 --- a/drivers/iommu/amd_iommu.c +++ b/drivers/iommu/amd_iommu.c @@ -1428,8 +1428,8 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom, unsigned long bus_addr, unsigned long page_size) { - unsigned long long unmap_size, unmapped; - unsigned long pte_pgsize; + unsigned long long unmapped; + unsigned long unmap_size; u64 *pte; BUG_ON(!is_power_of_2(page_size)); @@ -1438,28 +1438,12 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom, while (unmapped < page_size) { - pte = fetch_pte(dom, bus_addr, &pte_pgsize); - - if (!pte) { - /* - * No PTE for this address - * move forward in 4kb steps - */ - unmap_size = PAGE_SIZE; - } else if (PM_PTE_LEVEL(*pte) == 0) { - /* 4kb PTE found for this address */ - unmap_size = PAGE_SIZE; - *pte = 0ULL; - } else { - int count, i; - - /* Large PTE found which maps this address */ - unmap_size = PTE_PAGE_SIZE(*pte); - - /* Only unmap from the first pte in the page */ - if ((unmap_size - 1) & bus_addr) - break; - count = PAGE_SIZE_PTE_COUNT(unmap_size); + pte = fetch_pte(dom, bus_addr, &unmap_size); + + if (pte) { + int i, count; + + count = PAGE_SIZE_PTE_COUNT(unmap_size); for (i = 0; i < count; i++) pte[i] = 0ULL; } |