drm/sched: Add device name to the drm_sched_process_job event

Since switching the scheduler from using kthreads to workqueues in
commit a6149f039369 ("drm/sched: Convert drm scheduler to use a work
queue rather than kthread") userspace applications cannot determine
the device from the PID of the threads sending the trace events
anymore.

Each queue had its own kthread which had a given PID for the whole
time. So, at least for amdgpu, it was possible to associate a PID
to the hardware queues of each GPU in the system. Then, when a
drm_run_job trace event was received by userspace, the source PID
allowed to associate it back to the correct GPU.

With workqueues this is not possible anymore, so the event needs to
contain the dev_name() to identify the device.

Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@amd.com>
Signed-off-by: Philipp Stanner <phasta@kernel.org>
Link: https://lore.kernel.org/r/20250526125505.2360-4-pierre-eric.pelloux-prayer@amd.com

diff --git a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
index f56e77e7f6d0221d9779effcaaf9d35a84a99cdd..713df3516a17279db1d235c3fa57adbc22265e57 100644 (file)
--- a/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
+++ b/drivers/gpu/drm/scheduler/gpu_scheduler_trace.h
@@ -42,6 +42,7 @@ DECLARE_EVENT_CLASS(drm_sched_job,
                             __field(uint64_t, id)
                             __field(u32, job_count)
                             __field(int, hw_job_count)
+                            __string(dev, dev_name(sched_job->sched->dev))
                             ),
 
            TP_fast_assign(
@@ -52,9 +53,10 @@ DECLARE_EVENT_CLASS(drm_sched_job,
                           __entry->job_count = spsc_queue_count(&entity->job_queue);
                           __entry->hw_job_count = atomic_read(
                                   &sched_job->sched->credit_count);
+                          __assign_str(dev);
                           ),
-           TP_printk("entity=%p, id=%llu, fence=%p, ring=%s, job count:%u, hw job count:%d",
-                     __entry->entity, __entry->id,
+           TP_printk("dev=%s, entity=%p, id=%llu, fence=%p, ring=%s, job count:%u, hw job count:%d",
+                     __get_str(dev), __entry->entity, __entry->id,
                      __entry->fence, __get_str(name),
                      __entry->job_count, __entry->hw_job_count)
 );