drm/xe: Notify Userspace when gt reset fails

Send uevent in case of gt reset failure. This intimation can be used by
userspace monitoring tool to do the device level reset/reboot
when GT reset fails. udevadm can be used to monitor the uevents.

v2:
- Support only gt failure notification (Rodrigo)

v3
- Rectify the comments in header file.

v4
- Use pci kobj instead of drm kobj for notification.(Rodrigo)
- Cleanup (Badal)

v5
- Add tile id and gt id as additional info provided by uevent.
- Provide code documentation for the uevent. (Rodrigo)

Cc: Aravind Iddamsetty <aravind.iddamsetty@intel.com>
Cc: Tejas Upadhyay <tejas.upadhyay@intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Badal Nilawar <badal.nilawar@intel.com>
Signed-off-by: Himal Prasad Ghimiray <himal.prasad.ghimiray@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 10 insertions, 0 deletions

diff --git a/include/uapi/drm/xe_drm.h b/include/uapi/drm/xe_drm.h
index 259de80376b4..3d09e9e9267b 100644
--- a/include/uapi/drm/xe_drm.h
+++ b/include/uapi/drm/xe_drm.h
@@ -17,6 +17,16 @@ extern "C" {
  */
 
 /**
+ * DOC: uevent generated by xe on it's pci node.
+ *
+ * XE_RESET_FAILED_UEVENT - Event is generated when attempt to reset gt
+ * fails. The value supplied with the event is always "NEEDS_RESET".
+ * Additional information supplied is tile id and gt id of the gt unit for
+ * which reset has failed.
+ */
+#define XE_RESET_FAILED_UEVENT "DEVICE_STATUS"
+
+/**
  * struct xe_user_extension - Base class for defining a chain of extensions
  *
  * Many interfaces need to grow over time. In most cases we can simply