From: Nicolin Chen Date: Thu, 10 Jul 2025 05:59:16 +0000 (-0700) Subject: iommu/arm-smmu-v3-iommufd: Add hw_info to impl_ops X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9eb6a666df7f7a50e0a99c4c101864b8bb0dd685;p=thirdparty%2Fkernel%2Flinux.git iommu/arm-smmu-v3-iommufd: Add hw_info to impl_ops This will be used by Tegra241 CMDQV implementation to report a non-default HW info data. Link: https://patch.msgid.link/r/8a3bf5709358eb21aed2e8434534c30ecf83917c.1752126748.git.nicolinc@nvidia.com Reviewed-by: Jason Gunthorpe Reviewed-by: Pranjal Shrivastava Signed-off-by: Nicolin Chen Signed-off-by: Jason Gunthorpe --- 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 2ab1c6cf4aac3..1cf9646e776f8 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 @@ -11,13 +11,17 @@ void *arm_smmu_hw_info(struct device *dev, u32 *length, enum iommu_hw_info_type *type) { struct arm_smmu_master *master = dev_iommu_priv_get(dev); + const struct arm_smmu_impl_ops *impl_ops = master->smmu->impl_ops; struct iommu_hw_info_arm_smmuv3 *info; u32 __iomem *base_idr; unsigned int i; if (*type != IOMMU_HW_INFO_TYPE_DEFAULT && - *type != IOMMU_HW_INFO_TYPE_ARM_SMMUV3) - return ERR_PTR(-EOPNOTSUPP); + *type != IOMMU_HW_INFO_TYPE_ARM_SMMUV3) { + if (!impl_ops || !impl_ops->hw_info) + return ERR_PTR(-EOPNOTSUPP); + return impl_ops->hw_info(master->smmu, length, type); + } info = kzalloc(sizeof(*info), GFP_KERNEL); if (!info) 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 6183f212539ac..b7c7fdef531e4 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -721,6 +721,13 @@ 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); + /* + * An implementation should define its own type other than the default + * IOMMU_HW_INFO_TYPE_ARM_SMMUV3. And it must validate the input @type + * to return its own structure. + */ + void *(*hw_info)(struct arm_smmu_device *smmu, u32 *length, + enum iommu_hw_info_type *type); const size_t vsmmu_size; const enum iommu_viommu_type vsmmu_type; int (*vsmmu_init)(struct arm_vsmmu *vsmmu,