[PATCH v4 03/11] iommu/ioasid: Introduce a helper to check for valid PASIDs

[Fenghua Yu]

pasid_valid() is defined to check if a given PASID is valid.

Suggested-by: Ashok Raj <ashok.raj@xxxxxxxxx>
Suggested-by: Jacob Pan <jacob.jun.pan@xxxxxxxxxxxxxxx>
Signed-off-by: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Reviewed-by: Tony Luck <tony.luck@xxxxxxxxx>
Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
---
v4:
- Add "Reviewed-by: Thomas Gleixner <tglx@xxxxxxxxxxxxx>" (Thomas).

v2:
- Define a helper pasid_valid() (Ashok, Jacob, Thomas, Tony)

 include/linux/ioasid.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/include/linux/ioasid.h b/include/linux/ioasid.h
index e9dacd4b9f6b..2237f64dbaae 100644
--- 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 */
-- 
2.35.1