From 8144e60d9f80941dd9f8a53e4b468582aaa849b4 Mon Sep 17 00:00:00 2001
From: Shashank Sharma <shashank.sharma@xxxxxxx>
Date: Fri, 21 Jan 2022 17:23:41 +0100
Subject: [PATCH 1/4] drm: add a new drm event for GPU reset
This patch adds a DRM uevent to indicate GPU reset event. A
userspace can register to this event and do some postprocessing
if supported by native driver.
An example usage has been added into AMDGPU driver in this series.
Cc: Alexander Deucher <alexander.deucher@xxxxxxx>
Cc: Christian Koenig <christian.koenig@xxxxxxx>
Signed-off-by: Shashank Sharma <shashank.sharma@xxxxxxx>
---
drivers/gpu/drm/drm_sysfs.c | 19 +++++++++++++++++++
include/drm/drm_sysfs.h | 1 +
2 files changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index 968a9560b4aa..0d721d536bb1 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -343,6 +343,25 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
}
EXPORT_SYMBOL(drm_sysfs_hotplug_event);
+/**
+ * drm_sysfs_gpu_reset_event - generate a GPU reset uevent
+ * @dev: DRM device
+ *
+ * Send a uevent for the DRM device specified by @dev. This event will
+ * inform userspace that a GPU reset happened, and it can do some
+ * postprocessing (eg: data collecting from a trace event).
+ */
+void drm_sysfs_gpu_reset_event(struct drm_device *dev)
+{
+ char *event_string = "RESET=1";
+ char *envp[] = { event_string, NULL };
+
+ DRM_DEBUG("generating gpu reset event\n");
+
+ kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+EXPORT_SYMBOL(drm_sysfs_gpu_reset_event);
+
/**
* drm_sysfs_connector_status_event - generate a DRM uevent for connector
* property status change
diff --git a/include/drm/drm_sysfs.h b/include/drm/drm_sysfs.h
index d454ef617b2c..312956a0a1bf 100644
--- a/include/drm/drm_sysfs.h
+++ b/include/drm/drm_sysfs.h
@@ -11,6 +11,7 @@ int drm_class_device_register(struct device *dev);
void drm_class_device_unregister(struct device *dev);
void drm_sysfs_hotplug_event(struct drm_device *dev);
+void drm_sysfs_gpu_reset_event(struct drm_device *dev);
void drm_sysfs_connector_status_event(struct drm_connector *connector,
struct drm_property *property);
#endif
--
2.32.0
