iommu/ioasid: Introduce a helper to check for valid PASIDs

Define a pasid_valid() helper to check if a given PASID is valid. [ bp: Massage commit message. ] Suggested-by: Ashok Raj <[email protected]> Suggested-by: Jacob Pan <[email protected]> Signed-off-by: Fenghua Yu <[email protected]> Signed-off-by: Borislav Petkov <[email protected]> Reviewed-by: Tony Luck <[email protected]> Reviewed-by: Thomas Gleixner <[email protected]> Reviewed-by: Lu Baolu <[email protected]> Link: https://lore.kernel.org/r/[email protected]
SocioProphet · Feb 14, 2022 · 7a5fbc9 · 7a5fbc9
1 parent 7a853c2
commit 7a5fbc9
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
@@ -41,6 +41,10 @@ void *ioasid_find(struct ioasid_set *set, ioasid_t ioasid,
 int ioasid_register_allocator(struct ioasid_allocator_ops *allocator);
 void ioasid_unregister_allocator(struct ioasid_allocator_ops *allocator);
 int ioasid_set_data(ioasid_t ioasid, void *data);
+static inline bool pasid_valid(ioasid_t ioasid)
+{
+	return ioasid != INVALID_IOASID;
+}
 
 #else /* !CONFIG_IOASID */
 static inline ioasid_t ioasid_alloc(struct ioasid_set *set, ioasid_t min,
@@ -78,5 +82,10 @@ static inline int ioasid_set_data(ioasid_t ioasid, void *data)
 	return -ENOTSUPP;
 }
 
+static inline bool pasid_valid(ioasid_t ioasid)
+{
+	return false;
+}
+
 #endif /* CONFIG_IOASID */
 #endif /* __LINUX_IOASID_H */