RE: [PATCH v7 07/10] iommu: Remove SVA related callbacks from iommu ops

Tian, Kevin
2022-05-24T10:24:15Z

> From: Lu Baolu <baolu.lu@linux.intel.com>
> Sent: Thursday, May 19, 2022 3:21 PM
>
> These ops'es have been replaced with the dev_attach/detach_pasid domain
> ops'es. There's no need for them anymore. Remove them to avoid dead
> code.
>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Reviewed-by: Jean-Philippe Brucker <jean-philippe@linaro.org>

Reviewed-by: Kevin Tian <kevin.tian@intel.com>

> ---
> include/linux/intel-iommu.h | 3 --
> include/linux/iommu.h | 7 ---
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 16 ------
> .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c | 40 ---------------
> drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 3 --
> drivers/iommu/intel/iommu.c | 3 --
> drivers/iommu/intel/svm.c | 49 -------------------
> 7 files changed, 121 deletions(-)
>
> diff --git a/include/linux/intel-iommu.h b/include/linux/intel-iommu.h
> index 5e88eaa245aa..536f229fd274 100644
> --- a/include/linux/intel-iommu.h
> +++ b/include/linux/intel-iommu.h
> @@ -739,9 +739,6 @@ struct intel_iommu *device_to_iommu(struct device
> *dev, u8 *bus, u8 *devfn);
> extern void intel_svm_check(struct intel_iommu *iommu);
> extern int intel_svm_enable_prq(struct intel_iommu *iommu);
> extern int intel_svm_finish_prq(struct intel_iommu *iommu);
> -struct iommu_sva *intel_svm_bind(struct device *dev, struct mm_struct
> *mm);
> -void intel_svm_unbind(struct iommu_sva *handle);
> -u32 intel_svm_get_pasid(struct iommu_sva *handle);
> int intel_svm_page_response(struct device *dev, struct iommu_fault_event
> *evt,
> struct iommu_page_response *msg);
> int intel_svm_attach_dev_pasid(struct iommu_domain *domain,
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index d9ac5ebe5bbb..e4ce2fe0e144 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -212,9 +212,6 @@ struct iommu_iotlb_gather {
> * @dev_has/enable/disable_feat: per device entries to
> check/enable/disable
> * iommu specific features.
> * @dev_feat_enabled: check enabled feature
> - * @sva_bind: Bind process address space to device
> - * @sva_unbind: Unbind process address space from device
> - * @sva_get_pasid: Get PASID associated to a SVA handle
> * @page_response: handle page request response
> * @def_domain_type: device default domain type, return value:
> * - IOMMU_DOMAIN_IDENTITY: must use an identity domain
> @@ -248,10 +245,6 @@ struct iommu_ops {
> int (*dev_enable_feat)(struct device *dev, enum
> iommu_dev_features f);
> int (*dev_disable_feat)(struct device *dev, enum
> iommu_dev_features f);
>
> - struct iommu_sva *(*sva_bind)(struct device *dev, struct mm_struct
> *mm);
> - void (*sva_unbind)(struct iommu_sva *handle);
> - u32 (*sva_get_pasid)(struct iommu_sva *handle);
> -
> int (*page_response)(struct device *dev,
> struct iommu_fault_event *evt,
> struct iommu_page_response *msg);
> 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 ec77f6a51ff9..0f0f5ba26dd5 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
> @@ -754,9 +754,6 @@ bool arm_smmu_master_sva_enabled(struct
> arm_smmu_master *master);
> int arm_smmu_master_enable_sva(struct arm_smmu_master *master);
> int arm_smmu_master_disable_sva(struct arm_smmu_master *master);
> bool arm_smmu_master_iopf_supported(struct arm_smmu_master
> *master);
> -struct iommu_sva *arm_smmu_sva_bind(struct device *dev, struct
> mm_struct *mm);
> -void arm_smmu_sva_unbind(struct iommu_sva *handle);
> -u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle);
> void arm_smmu_sva_notifier_synchronize(void);
> int arm_smmu_sva_attach_dev_pasid(struct iommu_domain *domain,
> struct device *dev, ioasid_t id);
> @@ -793,19 +790,6 @@ static inline bool
> arm_smmu_master_iopf_supported(struct arm_smmu_master *master
> return false;
> }
>
> -static inline struct iommu_sva *
> -arm_smmu_sva_bind(struct device *dev, struct mm_struct *mm)
> -{
> - return ERR_PTR(-ENODEV);
> -}
> -
> -static inline void arm_smmu_sva_unbind(struct iommu_sva *handle) {}
> -
> -static inline u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
> -{
> - return IOMMU_PASID_INVALID;
> -}
> -
> static inline void arm_smmu_sva_notifier_synchronize(void) {}
> #endif /* CONFIG_ARM_SMMU_V3_SVA */
> #endif /* _ARM_SMMU_V3_H */
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> index 6969974ca89e..8290d66569f3 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -344,11 +344,6 @@ __arm_smmu_sva_bind(struct device *dev, struct
> mm_struct *mm)
> if (!bond)
> return ERR_PTR(-ENOMEM);
>
> - /* Allocate a PASID for this mm if necessary */
> - ret = iommu_sva_alloc_pasid(mm, 1, (1U << master->ssid_bits) - 1);
> - if (ret)
> - goto err_free_bond;
> -
> bond->mm = mm;
> bond->sva.dev = dev;
> refcount_set(&bond->refs, 1);
> @@ -367,41 +362,6 @@ __arm_smmu_sva_bind(struct device *dev, struct
> mm_struct *mm)
> return ERR_PTR(ret);
> }
>
> -struct iommu_sva *arm_smmu_sva_bind(struct device *dev, struct
> mm_struct *mm)
> -{
> - struct iommu_sva *handle;
> - struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
> - struct arm_smmu_domain *smmu_domain =
> to_smmu_domain(domain);
> -
> - if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
> - return ERR_PTR(-EINVAL);
> -
> - mutex_lock(&sva_lock);
> - handle = __arm_smmu_sva_bind(dev, mm);
> - mutex_unlock(&sva_lock);
> - return handle;
> -}
> -
> -void arm_smmu_sva_unbind(struct iommu_sva *handle)
> -{
> - struct arm_smmu_bond *bond = sva_to_bond(handle);
> -
> - mutex_lock(&sva_lock);
> - if (refcount_dec_and_test(&bond->refs)) {
> - list_del(&bond->list);
> - arm_smmu_mmu_notifier_put(bond->smmu_mn);
> - kfree(bond);
> - }
> - mutex_unlock(&sva_lock);
> -}
> -
> -u32 arm_smmu_sva_get_pasid(struct iommu_sva *handle)
> -{
> - struct arm_smmu_bond *bond = sva_to_bond(handle);
> -
> - return bond->mm->pasid;
> -}
> -
> bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
> {
> unsigned long reg, fld;
> 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 4ad3ca70cf89..b74f8964cc13 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2852,9 +2852,6 @@ static struct iommu_ops arm_smmu_ops = {
> .dev_feat_enabled = arm_smmu_dev_feature_enabled,
> .dev_enable_feat = arm_smmu_dev_enable_feature,
> .dev_disable_feat = arm_smmu_dev_disable_feature,
> - .sva_bind = arm_smmu_sva_bind,
> - .sva_unbind = arm_smmu_sva_unbind,
> - .sva_get_pasid = arm_smmu_sva_get_pasid,
> .page_response = arm_smmu_page_response,
> .pgsize_bitmap = -1UL, /* Restricted during device attach */
> .owner = THIS_MODULE,
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 2b6a52c87c73..10e07d59d4c8 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -4919,9 +4919,6 @@ const struct iommu_ops intel_iommu_ops = {
> .def_domain_type = device_def_domain_type,
> .pgsize_bitmap = SZ_4K,
> #ifdef CONFIG_INTEL_IOMMU_SVM
> - .sva_bind = intel_svm_bind,
> - .sva_unbind = intel_svm_unbind,
> - .sva_get_pasid = intel_svm_get_pasid,
> .page_response = intel_svm_page_response,
> .sva_domain_ops = &(const struct iommu_domain_ops) {
> .set_dev_pasid = intel_svm_attach_dev_pasid,
> diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
> index d575792441f3..e412a442d9a4 100644
> --- a/drivers/iommu/intel/svm.c
> +++ b/drivers/iommu/intel/svm.c
> @@ -313,14 +313,6 @@ static int pasid_to_svm_sdev(struct device *dev,
> unsigned int pasid,
> return 0;
> }
>
> -static int intel_svm_alloc_pasid(struct device *dev, struct mm_struct *mm)
> -{
> - ioasid_t max_pasid = dev_is_pci(dev) ?
> - pci_max_pasids(to_pci_dev(dev)) :
> intel_pasid_max_id;
> -
> - return iommu_sva_alloc_pasid(mm, PASID_MIN, max_pasid - 1);
> -}
> -
> static struct iommu_sva *intel_svm_bind_mm(struct intel_iommu *iommu,
> struct device *dev,
> ioasid_t pasid,
> @@ -810,47 +802,6 @@ static irqreturn_t prq_event_thread(int irq, void *d)
> return IRQ_RETVAL(handled);
> }
>
> -struct iommu_sva *intel_svm_bind(struct device *dev, struct mm_struct
> *mm)
> -{
> - struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
> - struct iommu_sva *sva;
> - int ret;
> -
> - mutex_lock(&pasid_mutex);
> - ret = intel_svm_alloc_pasid(dev, mm);
> - if (ret) {
> - mutex_unlock(&pasid_mutex);
> - return ERR_PTR(ret);
> - }
> -
> - sva = intel_svm_bind_mm(iommu, dev, mm->pasid, mm);
> - mutex_unlock(&pasid_mutex);
> -
> - return sva;
> -}
> -
> -void intel_svm_unbind(struct iommu_sva *sva)
> -{
> - struct intel_svm_dev *sdev = to_intel_svm_dev(sva);
> -
> - mutex_lock(&pasid_mutex);
> - intel_svm_unbind_mm(sdev->dev, sdev->pasid);
> - mutex_unlock(&pasid_mutex);
> -}
> -
> -u32 intel_svm_get_pasid(struct iommu_sva *sva)
> -{
> - struct intel_svm_dev *sdev;
> - u32 pasid;
> -
> - mutex_lock(&pasid_mutex);
> - sdev = to_intel_svm_dev(sva);
> - pasid = sdev->pasid;
> - mutex_unlock(&pasid_mutex);
> -
> - return pasid;
> -}
> -
> int intel_svm_page_response(struct device *dev,
> struct iommu_fault_event *evt,
> struct iommu_page_response *msg)
> --
> 2.25.1