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Message-ID: <ZxE7ILug+SL5eMsl@Asurada-Nvidia>
Date: Thu, 17 Oct 2024 09:28:16 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: <jgg@...dia.com>, <kevin.tian@...el.com>, <will@...nel.org>
CC: <joro@...tes.org>, <suravee.suthikulpanit@....com>,
<robin.murphy@....com>, <dwmw2@...radead.org>, <baolu.lu@...ux.intel.com>,
<shuah@...nel.org>, <linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
<linux-arm-kernel@...ts.infradead.org>, <linux-kselftest@...r.kernel.org>,
<eric.auger@...hat.com>, <jean-philippe@...aro.org>, <mdf@...nel.org>,
<mshavit@...gle.com>, <shameerali.kolothum.thodi@...wei.com>,
<smostafa@...gle.com>, <yi.l.liu@...el.com>, <aik@....com>,
<patches@...ts.linux.dev>
Subject: Re: [PATCH v3 11/11] iommu/arm-smmu-v3: Add
IOMMU_VIOMMU_TYPE_ARM_SMMUV3 support
On Wed, Oct 09, 2024 at 09:38:11AM -0700, Nicolin Chen wrote:
> Add a new driver-type for ARM SMMUv3 to enum iommu_viommu_type. Implement
> the viommu_alloc op with an arm_vsmmu_alloc function. As an initial step,
> copy the VMID from s2_parent. A later cleanup series is required to move
> the VMID allocation out of the stage-2 domain allocation routine to this.
>
> Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 18 ++++++++++++++
> include/uapi/linux/iommufd.h | 2 ++
> .../arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 24 +++++++++++++++++++
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 1 +
> 4 files changed, 45 insertions(+)
I squashed the following changes to this commit (will be in v4).
It replaces nested_domain->s2_parent with nested_domain->vsmmu:
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 5e235fca8f13..3cd8ad0a8980 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
@@ -36,14 +36,15 @@ 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;
+ return &nested_domain->vsmmu->s2_parent->domain;
}
static void arm_smmu_make_nested_cd_table_ste(
struct arm_smmu_ste *target, struct arm_smmu_master *master,
struct arm_smmu_nested_domain *nested_domain, bool ats_enabled)
{
- arm_smmu_make_s2_domain_ste(target, master, nested_domain->s2_parent,
+ arm_smmu_make_s2_domain_ste(target, master,
+ nested_domain->vsmmu->s2_parent,
ats_enabled);
target->data[0] = cpu_to_le64(STRTAB_STE_0_V |
@@ -84,7 +85,8 @@ static void arm_smmu_make_nested_domain_ste(
break;
case STRTAB_STE_0_CFG_BYPASS:
arm_smmu_make_s2_domain_ste(
- target, master, nested_domain->s2_parent, ats_enabled);
+ target, master, nested_domain->vsmmu->s2_parent,
+ ats_enabled);
break;
case STRTAB_STE_0_CFG_ABORT:
default:
@@ -109,7 +111,7 @@ static int arm_smmu_attach_dev_nested(struct iommu_domain *domain,
struct arm_smmu_ste ste;
int ret;
- if (nested_domain->s2_parent->smmu != master->smmu)
+ if (nested_domain->vsmmu->smmu != master->smmu)
return -EINVAL;
if (arm_smmu_ssids_in_use(&master->cd_table))
return -EBUSY;
@@ -164,8 +166,10 @@ static int arm_smmu_validate_vste(struct iommu_hwpt_arm_smmuv3 *arg)
struct iommu_domain *
arm_smmu_domain_alloc_nesting(struct device *dev, u32 flags,
struct iommu_domain *parent,
+ struct iommufd_viommu *viommu,
const struct iommu_user_data *user_data)
{
+ struct arm_vsmmu *vsmmu = container_of(viommu, struct arm_vsmmu, core);
struct arm_smmu_master *master = dev_iommu_priv_get(dev);
struct arm_smmu_nested_domain *nested_domain;
struct arm_smmu_domain *smmu_parent;
@@ -183,6 +187,10 @@ arm_smmu_domain_alloc_nesting(struct device *dev, u32 flags,
!(master->smmu->features & ARM_SMMU_FEAT_S2FWB))
return ERR_PTR(-EOPNOTSUPP);
+ /* Driver only supports nesting with the vIOMMU infrastructure */
+ if (!viommu)
+ return ERR_PTR(-EOPNOTSUPP);
+
/*
* The core code checks that parent was created with
* IOMMU_HWPT_ALLOC_NEST_PARENT
@@ -206,7 +214,7 @@ arm_smmu_domain_alloc_nesting(struct device *dev, u32 flags,
nested_domain->domain.type = IOMMU_DOMAIN_NESTED;
nested_domain->domain.ops = &arm_smmu_nested_ops;
- nested_domain->s2_parent = smmu_parent;
+ nested_domain->vsmmu = vsmmu;
nested_domain->ste[0] = arg.ste[0];
nested_domain->ste[1] = arg.ste[1] & ~cpu_to_le64(STRTAB_STE_1_EATS);
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 6a23e6dcd5cf..460d2fe5dd49 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2660,7 +2661,7 @@ to_smmu_domain_devices(struct iommu_domain *domain)
domain->type == IOMMU_DOMAIN_SVA)
return to_smmu_domain(domain);
if (domain->type == IOMMU_DOMAIN_NESTED)
- return to_smmu_nested_domain(domain)->s2_parent;
+ return to_smmu_nested_domain(domain)->vsmmu->s2_parent;
return NULL;
}
@@ -3128,7 +3129,7 @@ arm_smmu_domain_alloc_user(struct device *dev, u32 flags,
if (parent)
return arm_smmu_domain_alloc_nesting(dev, flags, parent,
- user_data);
+ viommu, user_data);
if (flags & ~PAGING_FLAGS)
return ERR_PTR(-EOPNOTSUPP);
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 844d1dfdea55..0ea1afe1bb7a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -836,7 +836,7 @@ struct arm_smmu_domain {
struct arm_smmu_nested_domain {
struct iommu_domain domain;
- struct arm_smmu_domain *s2_parent;
+ struct arm_vsmmu *vsmmu;
__le64 ste[2];
};
@@ -1018,6 +1018,7 @@ void *arm_smmu_hw_info(struct device *dev, u32 *length, u32 *type);
struct iommu_domain *
arm_smmu_domain_alloc_nesting(struct device *dev, u32 flags,
struct iommu_domain *parent,
+ struct iommufd_viommu *viommu,
const struct iommu_user_data *user_data);
struct iommufd_viommu *
arm_vsmmu_alloc(struct iommu_device *iommu_dev, struct iommu_domain *parent,
@@ -1027,6 +1028,7 @@ arm_vsmmu_alloc(struct iommu_device *iommu_dev, struct iommu_domain *parent,
static inline struct iommu_domain *
arm_smmu_domain_alloc_nesting(struct device *dev, u32 flags,
struct iommu_domain *parent,
+ struct iommufd_viommu *viommu,
const struct iommu_user_data *user_data)
{
return ERR_PTR(-EOPNOTSUPP);
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