Commit 46f2029f authored Nov 07, 2025 by Jesse.Zhang Committed by Alex Deucher Nov 11, 2025

drm/amdgpu: resume MES scheduling after user queue hang detection and recovery



This patch ensures the Micro-Engine Scheduler (MES) is properly resumed
after detecting and recovering from a user queue hang condition.

Key changes:
1. Track when a hung user queue is detected using found_hung_queue flag
2. Call amdgpu_mes_resume() to restart MES scheduling after completing
   the hang recovery process
3. This complements the existing recovery steps (fence force completion
   and device wedging) by ensuring the scheduler can process new work

Without this resume call, the MES scheduler may remain in a paused state
even after the hung queue has been handled, preventing newly submitted
work from being processed and leading to system stalls.

Acked-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Jesse Zhang <Jesse.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent 54798557

drivers/gpu/drm/amd/amdgpu/mes_userqueue.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -208,6 +208,7 @@ static int mes_userq_detect_and_reset(struct amdgpu_device *adev,
		unsigned int hung_db_num = 0;
		unsigned long queue_id;
		u32 db_array[8];
		bool found_hung_queue = false;
		int r, i;

		if (db_array_size > 8) {
		@@ -232,6 +233,7 @@ static int mes_userq_detect_and_reset(struct amdgpu_device *adev,
		for (i = 0; i < hung_db_num; i++) {
		if (queue->doorbell_index == db_array[i]) {
		queue->state = AMDGPU_USERQ_STATE_HUNG;
		found_hung_queue = true;
		atomic_inc(&adev->gpu_reset_counter);
		amdgpu_userq_fence_driver_force_completion(queue);
		drm_dev_wedged_event(adev_to_drm(adev), DRM_WEDGE_RECOVERY_NONE, NULL);
		@@ -241,6 +243,11 @@ static int mes_userq_detect_and_reset(struct amdgpu_device *adev,
		}
		}

		if (found_hung_queue) {
		/* Resume scheduling after hang recovery */
		r = amdgpu_mes_resume(adev);
		}

		return r;
		}