iommu/vt-d: Remove SVM_FLAG_PRIVATE_PASID

The SVM_FLAG_PRIVATE_PASID has never been referenced in the tree, and
there's no plan to have anything to use it. So cleanup it.
Signed-off-by: NLu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: NChristoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20210323010600.678627-4-baolu.lu@linux.intel.comSigned-off-by: NJoerg Roedel <jroedel@suse.de>

drivers/iommu/intel/svm.c

@@ -465,9 +465,9 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
 		  struct mm_struct *mm, struct intel_svm_dev **sd)
 {
 	struct intel_iommu *iommu = device_to_iommu(dev, NULL, NULL);
+	struct intel_svm *svm = NULL, *t;
 	struct device_domain_info *info;
 	struct intel_svm_dev *sdev;
-	struct intel_svm *svm = NULL;
 	unsigned long iflags;
 	int pasid_max;
 	int ret;
@@ -493,30 +493,26 @@ intel_svm_bind_mm(struct device *dev, unsigned int flags,
 		}
 	}
 
-	if (!(flags & SVM_FLAG_PRIVATE_PASID)) {
-		struct intel_svm *t;
-
-		list_for_each_entry(t, &global_svm_list, list) {
-			if (t->mm != mm || (t->flags & SVM_FLAG_PRIVATE_PASID))
-				continue;
-
-			svm = t;
-			if (svm->pasid >= pasid_max) {
-				dev_warn(dev,
-					 "Limited PASID width. Cannot use existing PASID %d\n",
-					 svm->pasid);
-				ret = -ENOSPC;
-				goto out;
-			}
+	list_for_each_entry(t, &global_svm_list, list) {
+		if (t->mm != mm)
+			continue;
 
-			/* Find the matching device in svm list */
-			for_each_svm_dev(sdev, svm, dev) {
-				sdev->users++;
-				goto success;
-			}
+		svm = t;
+		if (svm->pasid >= pasid_max) {
+			dev_warn(dev,
+				 "Limited PASID width. Cannot use existing PASID %d\n",
+				 svm->pasid);
+			ret = -ENOSPC;
+			goto out;
+		}
 
-			break;
+		/* Find the matching device in svm list */
+		for_each_svm_dev(sdev, svm, dev) {
+			sdev->users++;
+			goto success;
 		}
+
+		break;
 	}
 
 	sdev = kzalloc(sizeof(*sdev), GFP_KERNEL);

include/linux/intel-svm.h

@@ -14,16 +14,6 @@
 #define SVM_REQ_EXEC	(1<<1)
 #define SVM_REQ_PRIV	(1<<0)
 
-/*
- * The SVM_FLAG_PRIVATE_PASID flag requests a PASID which is *not* the "main"
- * PASID for the current process. Even if a PASID already exists, a new one
- * will be allocated. And the PASID allocated with SVM_FLAG_PRIVATE_PASID
- * will not be given to subsequent callers. This facility allows a driver to
- * disambiguate between multiple device contexts which access the same MM,
- * if there is no other way to do so. It should be used sparingly, if at all.
- */
-#define SVM_FLAG_PRIVATE_PASID		(1<<0)
-
 /*
  * The SVM_FLAG_SUPERVISOR_MODE flag requests a PASID which can be used only
  * for access to kernel addresses. No IOTLB flushes are automatically done
@@ -35,18 +25,18 @@
  * It is unlikely that we will ever hook into flush_tlb_kernel_range() to
  * do such IOTLB flushes automatically.
  */
-#define SVM_FLAG_SUPERVISOR_MODE	(1<<1)
+#define SVM_FLAG_SUPERVISOR_MODE	BIT(0)
 /*
  * The SVM_FLAG_GUEST_MODE flag is used when a PASID bind is for guest
  * processes. Compared to the host bind, the primary differences are:
  * 1. mm life cycle management
  * 2. fault reporting
  */
-#define SVM_FLAG_GUEST_MODE		(1<<2)
+#define SVM_FLAG_GUEST_MODE		BIT(1)
 /*
  * The SVM_FLAG_GUEST_PASID flag is used when a guest has its own PASID space,
  * which requires guest and host PASID translation at both directions.
  */
-#define SVM_FLAG_GUEST_PASID		(1<<3)
+#define SVM_FLAG_GUEST_PASID		BIT(2)
 
 #endif /* __INTEL_SVM_H__ */