[PATCH 3/3] drm/amdgpu: add AMDGPURESET uevent on AMD GPU reset

[Somalapuram Amaranath]

AMDGPURESET uevent added to notify userspace,
collect dump_stack and amdgpu_reset_reg_dumps

Signed-off-by: Somalapuram Amaranath <Amaranath.Somalapuram at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/nv.c | 31 +++++++++++++++++++++++++++++++
 1 file changed, 31 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/nv.c b/drivers/gpu/drm/amd/amdgpu/nv.c
index 2ec1ffb36b1f..41a2c37e825f 100644
--- a/drivers/gpu/drm/amd/amdgpu/nv.c
+++ b/drivers/gpu/drm/amd/amdgpu/nv.c
@@ -529,10 +529,41 @@ nv_asic_reset_method(struct amdgpu_device *adev)
 	}
 }
 
+/**
+ * drm_sysfs_reset_event - generate a DRM uevent
+ * @dev: DRM device
+ *
+ * Send a uevent for the DRM device specified by @dev.  Currently we only
+ * set AMDGPURESET=1 in the uevent environment, but this could be expanded to
+ * deal with other types of events.
+ *
+ * Any new uapi should be using the drm_sysfs_connector_status_event()
+ * for uevents on connector status change.
+ */
+void drm_sysfs_reset_event(struct drm_device *dev)
+{
+	char *event_string = "AMDGPURESET=1";
+	char *envp[2] = { event_string, NULL };
+
+	kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
+}
+
+void amdgpu_reset_dumps(struct amdgpu_device *adev)
+{
+	struct drm_device *ddev = adev_to_drm(adev);
+	/* original raven doesn't have full asic reset */
+	if ((adev->apu_flags & AMD_APU_IS_RAVEN) &&
+		!(adev->apu_flags & AMD_APU_IS_RAVEN2))
+		return;
+	drm_sysfs_reset_event(ddev);
+	dump_stack();
+}
+
 static int nv_asic_reset(struct amdgpu_device *adev)
 {
 	int ret = 0;
 
+	amdgpu_reset_dumps(adev);
 	switch (nv_asic_reset_method(adev)) {
 	case AMD_RESET_METHOD_PCI:
 		dev_info(adev->dev, "PCI reset\n");
-- 
2.25.1