iommu/vt-d: Remove guest pasid related callbacks

The guest pasid related callbacks are not called in the tree. Remove them
to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20220216025249.3459465-2-baolu.lu@linux.intel.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

1 files changed, 0 insertions, 209 deletions

diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index 5b5d69b04fcc..d04c83dd3a58 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -318,193 +318,6 @@ out:
 	return 0;
 }
 
-int intel_svm_bind_gpasid(struct iommu_domain *domain, struct device *dev,
-			  struct iommu_gpasid_bind_data *data)
-{
-	struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
-	struct intel_svm_dev *sdev = NULL;
-	struct dmar_domain *dmar_domain;
-	struct device_domain_info *info;
-	struct intel_svm *svm = NULL;
-	unsigned long iflags;
-	int ret = 0;
-
-	if (WARN_ON(!iommu) || !data)
-		return -EINVAL;
-
-	if (data->format != IOMMU_PASID_FORMAT_INTEL_VTD)
-		return -EINVAL;
-
-	/* IOMMU core ensures argsz is more than the start of the union */
-	if (data->argsz < offsetofend(struct iommu_gpasid_bind_data, vendor.vtd))
-		return -EINVAL;
-
-	/* Make sure no undefined flags are used in vendor data */
-	if (data->vendor.vtd.flags & ~(IOMMU_SVA_VTD_GPASID_LAST - 1))
-		return -EINVAL;
-
-	if (!dev_is_pci(dev))
-		return -ENOTSUPP;
-
-	/* VT-d supports devices with full 20 bit PASIDs only */
-	if (pci_max_pasids(to_pci_dev(dev)) != PASID_MAX)
-		return -EINVAL;
-
-	/*
-	 * We only check host PASID range, we have no knowledge to check
-	 * guest PASID range.
-	 */
-	if (data->hpasid <= 0 || data->hpasid >= PASID_MAX)
-		return -EINVAL;
-
-	info = get_domain_info(dev);
-	if (!info)
-		return -EINVAL;
-
-	dmar_domain = to_dmar_domain(domain);
-
-	mutex_lock(&pasid_mutex);
-	ret = pasid_to_svm_sdev(dev, data->hpasid, &svm, &sdev);
-	if (ret)
-		goto out;
-
-	if (sdev) {
-		/*
-		 * Do not allow multiple bindings of the same device-PASID since
-		 * there is only one SL page tables per PASID. We may revisit
-		 * once sharing PGD across domains are supported.
-		 */
-		dev_warn_ratelimited(dev, "Already bound with PASID %u\n",
-				     svm->pasid);
-		ret = -EBUSY;
-		goto out;
-	}
-
-	if (!svm) {
-		/* We come here when PASID has never been bond to a device. */
-		svm = kzalloc(sizeof(*svm), GFP_KERNEL);
-		if (!svm) {
-			ret = -ENOMEM;
-			goto out;
-		}
-		/* REVISIT: upper layer/VFIO can track host process that bind
-		 * the PASID. ioasid_set = mm might be sufficient for vfio to
-		 * check pasid VMM ownership. We can drop the following line
-		 * once VFIO and IOASID set check is in place.
-		 */
-		svm->mm = get_task_mm(current);
-		svm->pasid = data->hpasid;
-		if (data->flags & IOMMU_SVA_GPASID_VAL) {
-			svm->gpasid = data->gpasid;
-			svm->flags |= SVM_FLAG_GUEST_PASID;
-		}
-		pasid_private_add(data->hpasid, svm);
-		INIT_LIST_HEAD_RCU(&svm->devs);
-		mmput(svm->mm);
-	}
-	sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);
-	if (!sdev) {
-		ret = -ENOMEM;
-		goto out;
-	}
-	sdev->dev = dev;
-	sdev->sid = PCI_DEVID(info->bus, info->devfn);
-	sdev->iommu = iommu;
-
-	/* Only count users if device has aux domains */
-	if (iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX))
-		sdev->users = 1;
-
-	/* Set up device context entry for PASID if not enabled already */
-	ret = intel_iommu_enable_pasid(iommu, sdev->dev);
-	if (ret) {
-		dev_err_ratelimited(dev, "Failed to enable PASID capability\n");
-		kfree(sdev);
-		goto out;
-	}
-
-	/*
-	 * PASID table is per device for better security. Therefore, for
-	 * each bind of a new device even with an existing PASID, we need to
-	 * call the nested mode setup function here.
-	 */
-	spin_lock_irqsave(&iommu->lock, iflags);
-	ret = intel_pasid_setup_nested(iommu, dev,
-				       (pgd_t *)(uintptr_t)data->gpgd,
-				       data->hpasid, &data->vendor.vtd, dmar_domain,
-				       data->addr_width);
-	spin_unlock_irqrestore(&iommu->lock, iflags);
-	if (ret) {
-		dev_err_ratelimited(dev, "Failed to set up PASID %llu in nested mode, Err %d\n",
-				    data->hpasid, ret);
-		/*
-		 * PASID entry should be in cleared state if nested mode
-		 * set up failed. So we only need to clear IOASID tracking
-		 * data such that free call will succeed.
-		 */
-		kfree(sdev);
-		goto out;
-	}
-
-	svm->flags |= SVM_FLAG_GUEST_MODE;
-
-	init_rcu_head(&sdev->rcu);
-	list_add_rcu(&sdev->list, &svm->devs);
- out:
-	if (!IS_ERR_OR_NULL(svm) && list_empty(&svm->devs)) {
-		pasid_private_remove(data->hpasid);
-		kfree(svm);
-	}
-
-	mutex_unlock(&pasid_mutex);
-	return ret;
-}
-
-int intel_svm_unbind_gpasid(struct device *dev, u32 pasid)
-{
-	struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
-	struct intel_svm_dev *sdev;
-	struct intel_svm *svm;
-	int ret;
-
-	if (WARN_ON(!iommu))
-		return -EINVAL;
-
-	mutex_lock(&pasid_mutex);
-	ret = pasid_to_svm_sdev(dev, pasid, &svm, &sdev);
-	if (ret)
-		goto out;
-
-	if (sdev) {
-		if (iommu_dev_feature_enabled(dev, IOMMU_DEV_FEAT_AUX))
-			sdev->users--;
-		if (!sdev->users) {
-			list_del_rcu(&sdev->list);
-			intel_pasid_tear_down_entry(iommu, dev,
-						    svm->pasid, false);
-			intel_svm_drain_prq(dev, svm->pasid);
-			kfree_rcu(sdev, rcu);
-
-			if (list_empty(&svm->devs)) {
-				/*
-				 * We do not free the IOASID here in that
-				 * IOMMU driver did not allocate it.
-				 * Unlike native SVM, IOASID for guest use was
-				 * allocated prior to the bind call.
-				 * In any case, if the free call comes before
-				 * the unbind, IOMMU driver will get notified
-				 * and perform cleanup.
-				 */
-				pasid_private_remove(pasid);
-				kfree(svm);
-			}
-		}
-	}
-out:
-	mutex_unlock(&pasid_mutex);
-	return ret;
-}
-
 static int intel_svm_alloc_pasid(struct device *dev, struct mm_struct *mm,
 				 unsigned int flags)
 {
@@ -1126,28 +939,6 @@ int intel_svm_page_response(struct device *dev,
 	}
 
 	/*
-	 * For responses from userspace, need to make sure that the
-	 * pasid has been bound to its mm.
-	 */
-	if (svm->flags & SVM_FLAG_GUEST_MODE) {
-		struct mm_struct *mm;
-
-		mm = get_task_mm(current);
-		if (!mm) {
-			ret = -EINVAL;
-			goto out;
-		}
-
-		if (mm != svm->mm) {
-			ret = -ENODEV;
-			mmput(mm);
-			goto out;
-		}
-
-		mmput(mm);
-	}
-
-	/*
 	 * Per VT-d spec. v3.0 ch7.7, system software must respond
 	 * with page group response if private data is present (PDP)
 	 * or last page in group (LPIG) bit is set. This is an