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

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Date:   Wed, 23 Sep 2020 10:14:39 +0000
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH 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 2059e64fdc53..69996e57fae2 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -134,7 +134,7 @@ 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 5da5ce98b7b3..f913fc7b1e58 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -348,7 +348,7 @@ 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)
 {
@@ -357,11 +357,11 @@ 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) {
@@ -496,6 +496,8 @@ 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;
@@ -505,8 +507,7 @@ 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 3f6ede1e572c..87cea1cde414 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2078,13 +2078,15 @@ 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