linux-kernel - [PATCH v3 14/14] iommu/amd: Adopt IO page table framework

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Date:   Sun,  4 Oct 2020 01:45:49 +0000
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, robin.murphy@....com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [PATCH v3 14/14] 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/iommu.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 77f44b927ae7..6f8316206fb8 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>
@@ -1573,6 +1574,22 @@ static int pdev_iommuv2_enable(struct pci_dev *pdev)
 	return ret;
 }
 
+struct io_pgtable_ops *
+amd_iommu_setup_io_pgtable_ops(struct iommu_dev_data *dev_data,
+			       struct protection_domain *domain)
+{
+	struct amd_iommu *iommu = amd_iommu_rlookup_table[dev_data->devid];
+
+	domain->iop.pgtbl_cfg = (struct io_pgtable_cfg) {
+		.pgsize_bitmap	= AMD_IOMMU_PGSIZES,
+		.ias		= IOMMU_IN_ADDR_BIT_SIZE,
+		.oas		= IOMMU_OUT_ADDR_BIT_SIZE,
+		.iommu_dev	= &iommu->dev->dev,
+	};
+
+	return alloc_io_pgtable_ops(AMD_IOMMU_V1, &domain->iop.pgtbl_cfg, domain);
+}
+
 /*
  * If a device is not yet associated with a domain, this function makes the
  * device visible in the domain
@@ -1580,6 +1597,7 @@ 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 +1641,12 @@ 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 +1982,8 @@ 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