linux-kernel - [PATCH 13/13] iommu: amd: Adopt IO page table framework

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Date:   Wed, 23 Sep 2020 10:14:42 +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 13/13] iommu: amd: Adopt IO page table framework

Switch to using IO page table framework for AMD IOMMU v1 page table.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/amd_iommu.h |  3 +++
 drivers/iommu/amd/iommu.c     | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index 2e8dc2a1ec0f..046ea81a3b77 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -127,4 +127,7 @@ static inline void amd_iommu_apply_ivrs_quirks(void) { }
 extern void amd_iommu_domain_set_pgtable(struct protection_domain *domain,
 					 u64 *root, int mode);
 extern void amd_iommu_free_pgtable(struct amd_io_pgtable *pgtable);
+extern struct io_pgtable_ops *
+amd_iommu_setup_io_pgtable_ops(struct iommu_dev_data *dev_data,
+			       struct protection_domain *pdom);
 #endif
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 77f44b927ae7..df304d8a630a 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -32,6 +32,7 @@
 #include <linux/irqdomain.h>
 #include <linux/percpu.h>
 #include <linux/iova.h>
+#include <linux/io-pgtable.h>
 #include <asm/irq_remapping.h>
 #include <asm/io_apic.h>
 #include <asm/apic.h>
@@ -1580,6 +1581,7 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev)
 static int attach_device(struct device *dev,
 			 struct protection_domain *domain)
 {
+	struct io_pgtable_ops *pgtbl_ops;
 	struct iommu_dev_data *dev_data;
 	struct pci_dev *pdev;
 	unsigned long flags;
@@ -1623,6 +1625,12 @@ static int attach_device(struct device *dev,
 skip_ats_check:
 	ret = 0;
 
+	pgtbl_ops = amd_iommu_setup_io_pgtable_ops(dev_data, domain);
+	if (!pgtbl_ops) {
+		ret = -ENOMEM;
+		goto out;
+	}
+
 	do_attach(dev_data, domain);
 
 	/*
@@ -1958,6 +1966,8 @@ static void amd_iommu_domain_free(struct iommu_domain *dom)
 	if (domain->dev_cnt > 0)
 		cleanup_domain(domain);
 
+	free_io_pgtable_ops(&domain->iop.iop.ops);
+
 	BUG_ON(domain->dev_cnt != 0);
 
 	if (!dom)
-- 
2.17.1