From: Joerg Roedel <jroedel@xxxxxxx>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 71b390e9bec5121d25c45326ff0b0b96a143f9a8 upstream.
Now that fetch_pte returns the page-size of the pte, this
function can be optimized a lot.
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Joerg Roedel <jroedel@xxxxxxx>
Signed-off-by: Jiri Slaby <jslaby@xxxxxxx>
---
drivers/iommu/amd_iommu.c | 32 ++++++++------------------------
1 file changed, 8 insertions(+), 24 deletions(-)
diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
index 976cf15744a9..8f6344df7c49 100644
--- a/drivers/iommu/amd_iommu.c
+++ b/drivers/iommu/amd_iommu.c
@@ -1479,8 +1479,8 @@ 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));
@@ -1489,28 +1489,12 @@ 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;
}
--
2.4.2
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