linux-kernel - [RFC PATCH 7/7] iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API

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Message-Id: <20210312090411.6030-8-suravee.suthikulpanit@amd.com>
Date:   Fri, 12 Mar 2021 03:04:11 -0600
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, Jon.Grimm@....com, Wei.Huang2@....com,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Subject: [RFC PATCH 7/7] iommu/amd: Add support for using AMD IOMMU v2 page table for DMA-API

Introduce init function for setting up DMA domain for DMA-API with
the IOMMU v2 page table.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
---
 drivers/iommu/amd/iommu.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index e29ece6e1e68..bd26de8764bd 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -1937,6 +1937,24 @@ static int protection_domain_init_v1(struct protection_domain *domain, int mode)
 	return 0;
 }
 
+static int protection_domain_init_v2(struct protection_domain *domain)
+{
+	spin_lock_init(&domain->lock);
+	domain->id = domain_id_alloc();
+	if (!domain->id)
+		return -ENOMEM;
+	INIT_LIST_HEAD(&domain->dev_list);
+
+	domain->giov = true;
+
+	if (amd_iommu_pgtable == AMD_IOMMU_V2 &&
+	    domain_enable_v2(domain, 1, false)) {
+		return -ENOMEM;
+	}
+
+	return 0;
+}
+
 static struct protection_domain *protection_domain_alloc(unsigned int type)
 {
 	struct io_pgtable_ops *pgtbl_ops;
@@ -1964,6 +1982,9 @@ static struct protection_domain *protection_domain_alloc(unsigned int type)
 	case AMD_IOMMU_V1:
 		ret = protection_domain_init_v1(domain, mode);
 		break;
+	case AMD_IOMMU_V2:
+		ret = protection_domain_init_v2(domain);
+		break;
 	default:
 		ret = -EINVAL;
 	}
-- 
2.17.1