linux-kernel - [PATCH v1 09/14] iommu/arm-smmu-v3: Implement arm_smmu_get_unmanaged

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Date:   Thu, 9 Mar 2023 02:53:45 -0800
From:   Nicolin Chen <nicolinc@...dia.com>
To:     <jgg@...dia.com>, <robin.murphy@....com>, <will@...nel.org>
CC:     <eric.auger@...hat.com>, <kevin.tian@...el.com>,
        <baolu.lu@...ux.intel.com>, <joro@...tes.org>,
        <shameerali.kolothum.thodi@...wei.com>, <jean-philippe@...aro.org>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v1 09/14] iommu/arm-smmu-v3: Implement arm_smmu_get_unmanaged_domain

In a 1-stage translation setup, a device is attached to an iommu_domain
(ARM_SMMU_DOMAIN_S1) that is IOMMU_DOMAIN_UNMANAGED type.

In a 2-stage translation setup, a device is attached to an iommu_domain
(ARM_SMMU_DOMAIN_S1) that is IOMMU_DOMAIN_NESTED type, which must have
a valid "s2" pointer for an iommu_domain (ARM_SMMU_DOMAIN_S2) that is
IOMMU_DOMAIN_UNMANAGED type.

Add a function to return the correct iommu_domain pointer accordingly.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 12 ++++++++++++
 1 file changed, 12 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 fee5977feef3..18ab5d516cf2 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2082,6 +2082,17 @@ static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
 	return &smmu_domain->domain;
 }
 
+static struct iommu_domain *arm_smmu_get_unmanaged_domain(struct device *dev)
+{
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct arm_smmu_domain *smmu_domain = master->domain;
+
+	if (smmu_domain->s2)
+		return &smmu_domain->s2->domain;
+
+	return &smmu_domain->domain;
+}
+
 static int arm_smmu_bitmap_alloc(unsigned long *map, int span)
 {
 	int idx, size = 1 << span;
@@ -2878,6 +2889,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.capable		= arm_smmu_capable,
 	.hw_info		= arm_smmu_hw_info,
 	.domain_alloc		= arm_smmu_domain_alloc,
+	.get_unmanaged_domain	= arm_smmu_get_unmanaged_domain,
 	.probe_device		= arm_smmu_probe_device,
 	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,
-- 
2.39.2