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[34.143.210.2]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-22db4d76d34sm108297185ad.39.2025.04.29.14.36.14 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Apr 2025 14:36:19 -0700 (PDT) Date: Tue, 29 Apr 2025 21:36:09 +0000 From: Pranjal Shrivastava To: Nicolin Chen Cc: jgg@nvidia.com, kevin.tian@intel.com, corbet@lwn.net, will@kernel.org, bagasdotme@gmail.com, robin.murphy@arm.com, joro@8bytes.org, thierry.reding@gmail.com, vdumpa@nvidia.com, jonathanh@nvidia.com, shuah@kernel.org, jsnitsel@redhat.com, nathan@kernel.org, peterz@infradead.org, yi.l.liu@intel.com, mshavit@google.com, zhangzekun11@huawei.com, iommu@lists.linux.dev, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-tegra@vger.kernel.org, linux-kselftest@vger.kernel.org, patches@lists.linux.dev, mochs@nvidia.com, alok.a.tiwari@oracle.com, vasant.hegde@amd.com Subject: Re: [PATCH v2 16/22] iommu/arm-smmu-v3-iommufd: Add vsmmu_alloc impl op Message-ID: References: <73b1fc34b07f2ac42d542dd996c7119ae5f8939c.1745646960.git.nicolinc@nvidia.com> Precedence: bulk X-Mailing-List: linux-doc@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <73b1fc34b07f2ac42d542dd996c7119ae5f8939c.1745646960.git.nicolinc@nvidia.com> On Fri, Apr 25, 2025 at 10:58:11PM -0700, Nicolin Chen wrote: > An impl driver might support its own vIOMMU object, as tegra241-cmdqv will > add IOMMU_VIOMMU_TYPE_TEGRA241_CMDQV. > > Add a vsmmu_alloc op to give impl a try, upon failure fallback to standard > vsmmu allocation for IOMMU_VIOMMU_TYPE_ARM_SMMUV3. > > Signed-off-by: Nicolin Chen Reviewd-by: Pranjal Shrivastava > --- > drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 6 ++++++ > .../iommu/arm/arm-smmu-v3/arm-smmu-v3-iommufd.c | 17 +++++++++++------ > 2 files changed, 17 insertions(+), 6 deletions(-) > > 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 6b8f0d20dac3..a5835af72417 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 > > struct arm_smmu_device; > +struct arm_smmu_domain; > > /* MMIO registers */ > #define ARM_SMMU_IDR0 0x0 > @@ -720,6 +721,11 @@ 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); > + struct arm_vsmmu *(*vsmmu_alloc)( > + struct arm_smmu_device *smmu, > + struct arm_smmu_domain *smmu_domain, struct iommufd_ctx *ictx, > + unsigned int viommu_type, > + 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 66855cae775e..a8a78131702d 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 > @@ -392,10 +392,7 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, > iommu_get_iommu_dev(dev, struct arm_smmu_device, iommu); > struct arm_smmu_master *master = dev_iommu_priv_get(dev); > struct arm_smmu_domain *s2_parent = to_smmu_domain(parent); > - struct arm_vsmmu *vsmmu; > - > - if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3) > - return ERR_PTR(-EOPNOTSUPP); > + struct arm_vsmmu *vsmmu = ERR_PTR(-EOPNOTSUPP); > > if (!(smmu->features & ARM_SMMU_FEAT_NESTING)) > return ERR_PTR(-EOPNOTSUPP); > @@ -423,8 +420,16 @@ struct iommufd_viommu *arm_vsmmu_alloc(struct device *dev, > !(smmu->features & ARM_SMMU_FEAT_S2FWB)) > return ERR_PTR(-EOPNOTSUPP); > > - vsmmu = iommufd_viommu_alloc(ictx, struct arm_vsmmu, core, > - &arm_vsmmu_ops); > + if (master->smmu->impl_ops && master->smmu->impl_ops->vsmmu_alloc) > + vsmmu = master->smmu->impl_ops->vsmmu_alloc( > + master->smmu, s2_parent, ictx, viommu_type, user_data); > + if (PTR_ERR(vsmmu) == -EOPNOTSUPP) { > + if (viommu_type != IOMMU_VIOMMU_TYPE_ARM_SMMUV3) > + return ERR_PTR(-EOPNOTSUPP); > + /* Fallback to standard SMMUv3 type if viommu_type matches */ > + vsmmu = iommufd_viommu_alloc(ictx, struct arm_vsmmu, core, > + &arm_vsmmu_ops); > + } > if (IS_ERR(vsmmu)) > return ERR_CAST(vsmmu); > > -- > 2.43.0 >