linux-kernel - [PATCH v4 11/13] iommu/amd: Introduce iommu_v1_iova_to

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Message-Id: <20201215073705.123786-12-suravee.suthikulpanit@amd.com>
Date:   Tue, 15 Dec 2020 01:37:03 -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 11/13] iommu/amd: Introduce iommu_v1_iova_to_phys

This implements iova_to_phys for AMD IOMMU v1 pagetable,
which will be used by the IO page table framework.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/io_pgtable.c | 22 ++++++++++++++++++++++
 drivers/iommu/amd/iommu.c      | 16 +---------------
 2 files changed, 23 insertions(+), 15 deletions(-)

diff --git a/drivers/iommu/amd/io_pgtable.c b/drivers/iommu/amd/io_pgtable.c
index 87184b6cee0f..a293b69b38b9 100644
--- a/drivers/iommu/amd/io_pgtable.c
+++ b/drivers/iommu/amd/io_pgtable.c
@@ -494,6 +494,26 @@ unsigned long iommu_unmap_page(struct protection_domain *dom,
 	return unmapped;
 }
 
+static phys_addr_t iommu_v1_iova_to_phys(struct io_pgtable_ops *ops, unsigned long iova)
+{
+	struct amd_io_pgtable *pgtable = io_pgtable_ops_to_data(ops);
+	unsigned long offset_mask, pte_pgsize;
+	u64 *pte, __pte;
+
+	if (pgtable->mode == PAGE_MODE_NONE)
+		return iova;
+
+	pte = fetch_pte(pgtable, iova, &pte_pgsize);
+
+	if (!pte || !IOMMU_PTE_PRESENT(*pte))
+		return 0;
+
+	offset_mask = pte_pgsize - 1;
+	__pte	    = __sme_clr(*pte & PM_ADDR_MASK);
+
+	return (__pte & ~offset_mask) | (iova & offset_mask);
+}
+
 /*
  * ----------------------------------------------------
  */
@@ -534,6 +554,8 @@ static struct io_pgtable *v1_alloc_pgtable(struct io_pgtable_cfg *cfg, void *coo
 	cfg->oas            = IOMMU_OUT_ADDR_BIT_SIZE,
 	cfg->tlb            = &v1_flush_ops;
 
+	pgtable->iop.ops.iova_to_phys = iommu_v1_iova_to_phys;
+
 	return &pgtable->iop;
 }
 
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 76f61dd6b89f..29b7fefc8485 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2101,22 +2101,8 @@ static phys_addr_t amd_iommu_iova_to_phys(struct iommu_domain *dom,
 {
 	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(pgtable, iova, &pte_pgsize);
-
-	if (!pte || !IOMMU_PTE_PRESENT(*pte))
-		return 0;
-
-	offset_mask = pte_pgsize - 1;
-	__pte	    = __sme_clr(*pte & PM_ADDR_MASK);
-
-	return (__pte & ~offset_mask) | (iova & offset_mask);
+	return ops->iova_to_phys(ops, iova);
 }
 
 static bool amd_iommu_capable(enum iommu_cap cap)
-- 
2.17.1