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Commit 71b390e9 authored by Joerg Roedel's avatar Joerg Roedel
Browse files

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: default avatarSuravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Signed-off-by: default avatarJoerg Roedel <jroedel@suse.de>
parent 3039ca1b

drivers/iommu/amd_iommu.c

+8 −24
Original line number Original line Diff line number Diff line
@@ -1428,8 +1428,8 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom, 
				      unsigned long bus_addr,

				      unsigned long bus_addr,

				      unsigned long page_size)

				      unsigned long page_size)

{

{

	unsigned long long unmap_size, unmapped;

	unsigned long long unmapped;

	unsigned long pte_pgsize;

	unsigned long unmap_size;

	u64 *pte;

	u64 *pte;





	BUG_ON(!is_power_of_2(page_size));

	BUG_ON(!is_power_of_2(page_size));
@@ -1438,27 +1438,11 @@ static unsigned long iommu_unmap_page(struct protection_domain *dom, 




	while (unmapped < page_size) {

	while (unmapped < page_size) {





		pte = fetch_pte(dom, bus_addr, &pte_pgsize);

		pte = fetch_pte(dom, bus_addr, &unmap_size);





		if (!pte) {

		if (pte) {

			/*

			int i, count;

			 * 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);

			count = PAGE_SIZE_PTE_COUNT(unmap_size);

			for (i = 0; i < count; i++)

			for (i = 0; i < count; i++)

				pte[i] = 0ULL;

				pte[i] = 0ULL;