linux-kernel - [PATCH v6 19/25] iommu/arm-smmu-v3-iommufd: Add vsmmu_size/type and vsmmu

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Message-ID: <fec2ae84501938503d892ebe80ae332604c57b6c.1749884998.git.nicolinc@nvidia.com>
Date: Sat, 14 Jun 2025 00:14:44 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <corbet@....net>,
	<will@...nel.org>
CC: <bagasdotme@...il.com>, <robin.murphy@....com>, <joro@...tes.org>,
	<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
	<shuah@...nel.org>, <jsnitsel@...hat.com>, <nathan@...nel.org>,
	<peterz@...radead.org>, <yi.l.liu@...el.com>, <mshavit@...gle.com>,
	<praan@...gle.com>, <zhangzekun11@...wei.com>, <iommu@...ts.linux.dev>,
	<linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>,
	<mochs@...dia.com>, <alok.a.tiwari@...cle.com>, <vasant.hegde@....com>,
	<dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>
Subject: [PATCH v6 19/25] iommu/arm-smmu-v3-iommufd: Add vsmmu_size/type and vsmmu_init impl ops

An impl driver might want to allocate its own type of vIOMMU object or the
standard IOMMU_VIOMMU_TYPE_ARM_SMMUV3 by setting up its own SW/HW bits, as
the tegra241-cmdqv driver will add IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV.

Add vsmmu_size/type and vsmmu_init to struct arm_smmu_impl_ops. Prioritize
them in arm_smmu_get_viommu_size() and arm_vsmmu_init().

Reviewed-by: Pranjal Shrivastava <praan@...gle.com>
Reviewed-by: Kevin Tian <kevin.tian@...el.com>
Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h         | 5 +++++
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 8 ++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 7eed5c8c72dd..07589350b2a1 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -16,6 +16,7 @@
 #include <linux/sizes.h>
 
 struct arm_smmu_device;
+struct arm_vsmmu;
 
 /* MMIO registers */
 #define ARM_SMMU_IDR0			0x0
@@ -720,6 +721,10 @@ struct arm_smmu_impl_ops {
 	int (*init_structures)(struct arm_smmu_device *smmu);
 	struct arm_smmu_cmdq *(*get_secondary_cmdq)(
 		struct arm_smmu_device *smmu, struct arm_smmu_cmdq_ent *ent);
+	const size_t vsmmu_size;
+	const enum iommu_viommu_type vsmmu_type;
+	int (*vsmmu_init)(struct arm_vsmmu *vsmmu,
+			  const struct iommu_user_data *user_data);
 };
 
 /* An SMMUv3 instance */
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
index c14f7e6b4dae..445365ae19e0 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c
@@ -415,6 +415,10 @@ size_t arm_smmu_get_viommu_size(struct device *dev,
 	    !(smmu->features & ARM_SMMU_FEAT_S2FWB))
 		return 0;
 
+	if (smmu->impl_ops && smmu->impl_ops->vsmmu_size &&
+	    viommu_type == smmu->impl_ops->vsmmu_type)
+		return smmu->impl_ops->vsmmu_size;
+
 	if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3)
 		return 0;
 
@@ -438,6 +442,10 @@ int arm_vsmmu_init(struct iommufd_viommu *viommu,
 	/* FIXME Move VMID allocation from the S2 domain allocation to here */
 	vsmmu->vmid = s2_parent->s2_cfg.vmid;
 
+	if (smmu->impl_ops && smmu->impl_ops->vsmmu_init &&
+	    viommu->type == smmu->impl_ops->vsmmu_type)
+		return smmu->impl_ops->vsmmu_init(vsmmu, user_data);
+
 	viommu->ops = &arm_vsmmu_ops;
 	return 0;
 }
-- 
2.43.0