as there are IOMMUFD users that want to know check if an ID generated
by IOMMUFD is valid or not. e.g. vfio-pci optionaly returns invalid
dev_id to user in the VFIO_DEVICE_GET_PCI_HOT_RESET_INFO ioctl. User
needs to check if the ID is valid or not.
IOMMUFD_INVALID_ID is defined as 0 since the IDs generated by IOMMUFD
starts from 0.
Signed-off-by: Yi Liu <yi.l.liu@xxxxxxxxx>
---
include/uapi/linux/iommufd.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/include/uapi/linux/iommufd.h b/include/uapi/linux/iommufd.h
index 98ebba80cfa1..aeae73a93833 100644
--- a/include/uapi/linux/iommufd.h
+++ b/include/uapi/linux/iommufd.h
@@ -9,6 +9,9 @@
#define IOMMUFD_TYPE (';')
+/* IDs allocated by IOMMUFD starts from 0 */
+#define IOMMUFD_INVALID_ID 0
+
/**
* DOC: General ioctl format
*
--
2.34.1
