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From:   Lu Baolu <baolu.lu@linux.intel.com>
To:     Joerg Roedel <joro@8bytes.org>, Jason Gunthorpe <jgg@nvidia.com>,
        Christoph Hellwig <hch@infradead.org>,
        Kevin Tian <kevin.tian@intel.com>,
        Ashok Raj <ashok.raj@intel.com>, Will Deacon <will@kernel.org>,
        Robin Murphy <robin.murphy@arm.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.com>,
        Dave Jiang <dave.jiang@intel.com>,
        Vinod Koul <vkoul@kernel.org>
Cc:     Eric Auger <eric.auger@redhat.com>, Liu Yi L <yi.l.liu@intel.com>,
        Jacob jun Pan <jacob.jun.pan@intel.com>,
        iommu@lists.linux-foundation.org, iommu@lists.linux.dev,
        linux-kernel@vger.kernel.org, Lu Baolu <baolu.lu@linux.intel.com>,
        Jean-Philippe Brucker <jean-philippe@linaro.org>
Subject: [PATCH v9 08/11] iommu: Remove SVA related callbacks from iommu ops
Date:   Tue, 21 Jun 2022 22:43:50 +0800
Message-Id: <20220621144353.17547-9-baolu.lu@linux.intel.com>
In-Reply-To: <20220621144353.17547-1-baolu.lu@linux.intel.com>
References: <20220621144353.17547-1-baolu.lu@linux.intel.com>
MIME-Version: 1.0
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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 9007428a68f1..5bd19c95a926 100644
--- a/include/linux/intel-iommu.h
+++ b/include/linux/intel-iommu.h
@@ -738,9 +738,6 @@ 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);
 struct iommu_domain *intel_svm_domain_alloc(void);
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index c0c23d9fd8fe..17780537db6e 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -227,9 +227,6 @@ 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
@@ -263,10 +260,6 @@ 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 96399dd3a67a..15dd4c7e6d3a 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);
 struct iommu_domain *arm_smmu_sva_domain_alloc(void);
 #else /* CONFIG_ARM_SMMU_V3_SVA */
@@ -790,19 +787,6 @@ 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) {}
 
 static inline struct iommu_domain *arm_smmu_sva_domain_alloc(void)
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 fc4555dac5b4..e36c689f56c5 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 a30b252e2f95..8b9b78c7a67d 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2855,9 +2855,6 @@ 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 993a1ce509a8..37d68eda1889 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -4921,9 +4921,6 @@ 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,
 #endif
 	.default_domain_ops = &(const struct iommu_domain_ops) {
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 7d4f9d173013..db55b06cafdf 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,
 					   struct mm_struct *mm)
@@ -809,47 +801,6 @@ 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);
-	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