linux-kernel - [PATCH v4 10/13] iommu/amd: Refactor fetch_pte to use struct amd_io

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-Id: <20201215073705.123786-11-suravee.suthikulpanit@amd.com>
Date:   Tue, 15 Dec 2020 01:37:02 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, will@...nel.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v4 10/13] iommu/amd: Refactor fetch_pte to use struct amd_io_pgtable

To simplify the fetch_pte function. There is no functional change.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/amd_iommu.h  |  2 +-
 drivers/iommu/amd/io_pgtable.c | 13 +++++++------
 drivers/iommu/amd/iommu.c      |  4 +++-
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index 76276d9e463c..83ca822c5349 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -143,7 +143,7 @@ extern int iommu_map_page(struct protection_domain *dom,
 extern unsigned long iommu_unmap_page(struct protection_domain *dom,
 				      unsigned long bus_addr,
 				      unsigned long page_size);
-extern u64 *fetch_pte(struct protection_domain *domain,
+extern u64 *fetch_pte(struct amd_io_pgtable *pgtable,
 		      unsigned long address,
 		      unsigned long *page_size);
 extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index 35dd9153e6b7..87184b6cee0f 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -317,7 +317,7 @@ 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.
  */
-u64 *fetch_pte(struct protection_domain *domain,
+u64 *fetch_pte(struct amd_io_pgtable *pgtable,
 	       unsigned long address,
 	       unsigned long *page_size)
 {
@@ -326,11 +326,11 @@ u64 *fetch_pte(struct protection_domain *domain,
 
 	*page_size = 0;
 
-	if (address > PM_LEVEL_SIZE(domain->iop.mode))
+	if (address > PM_LEVEL_SIZE(pgtable->mode))
 		return NULL;
 
-	level	   =  domain->iop.mode - 1;
-	pte	   = &domain->iop.root[PM_LEVEL_INDEX(level, address)];
+	level	   =  pgtable->mode - 1;
+	pte	   = &pgtable->root[PM_LEVEL_INDEX(level, address)];
 	*page_size =  PTE_LEVEL_PAGE_SIZE(level);
 
 	while (level > 0) {
@@ -465,6 +465,8 @@ unsigned long iommu_unmap_page(struct protection_domain *dom,
 			       unsigned long iova,
 			       unsigned long size)
 {
+	struct io_pgtable_ops *ops = &dom->iop.iop.ops;
+	struct amd_io_pgtable *pgtable = io_pgtable_ops_to_data(ops);
 	unsigned long long unmapped;
 	unsigned long unmap_size;
 	u64 *pte;
@@ -474,8 +476,7 @@ unsigned long iommu_unmap_page(struct protection_domain *dom,
 	unmapped = 0;
 
 	while (unmapped < size) {
-		pte = fetch_pte(dom, iova, &unmap_size);
-
+		pte = fetch_pte(pgtable, iova, &unmap_size);
 		if (pte) {
 			int i, count;
 
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 2963a37b7c16..76f61dd6b89f 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2100,13 +2100,15 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 					  dma_addr_t iova)
 {
 	struct protection_domain *domain = to_pdomain(dom);
+	struct io_pgtable_ops *ops = &domain->iop.iop.ops;
+	struct amd_io_pgtable *pgtable = io_pgtable_ops_to_data(ops);
 	unsigned long offset_mask, pte_pgsize;
 	u64 *pte, __pte;
 
 	if (domain->iop.mode == PAGE_MODE_NONE)
 		return iova;
 
-	pte = fetch_pte(domain, iova, &pte_pgsize);
+	pte = fetch_pte(pgtable, iova, &pte_pgsize);
 
 	if (!pte || !IOMMU_PTE_PRESENT(*pte))
 		return 0;
-- 
2.17.1