linux-kernel - [PATCH v3 4/4] iommu/arm-smmu-v3: Implement arm_smmu_get_msi_mapping

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Message-ID: <4fb65d188978955861cc3d3bf665ca83b8debb9b.1723056910.git.nicolinc@nvidia.com>
Date: Wed, 7 Aug 2024 12:00:07 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <robin.murphy@....com>, <joro@...tes.org>, <shuah@...nel.org>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>
Subject: [PATCH v3 4/4] iommu/arm-smmu-v3: Implement arm_smmu_get_msi_mapping_domain

In a 1-stage translation setup, a device is attached to a paging domain.
In a 2-stage translation setup, a device is attached to a nested domain,
which does not have the mappings for the MSI page but only an s2_parent
paging domain pointer that holds the mappings.

Add arm_smmu_get_msi_mapping_domain in arm_smmu_nested_ops to return the
correct paging domain.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 24836f3269b3..3962d5a55519 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3305,10 +3305,20 @@ static int arm_smmu_cache_invalidate_user(struct iommu_domain *domain,
 	return ret;
 }
 
+static struct iommu_domain *
+arm_smmu_get_msi_mapping_domain(struct iommu_domain *domain)
+{
+	struct arm_smmu_nested_domain *nested_domain =
+		container_of(domain, struct arm_smmu_nested_domain, domain);
+
+	return &nested_domain->s2_parent->domain;
+}
+
 static const struct iommu_domain_ops arm_smmu_nested_ops = {
 	.attach_dev = arm_smmu_attach_dev_nested,
 	.free = arm_smmu_domain_nested_free,
 	.cache_invalidate_user	= arm_smmu_cache_invalidate_user,
+	.get_msi_mapping_domain	= arm_smmu_get_msi_mapping_domain,
 };
 
 static struct iommu_domain *
-- 
2.43.0