container_of(wrk, typeof(*engine), heartbeat.work.work);
struct intel_context *ce = engine->kernel_context;
struct i915_request *rq;
+ unsigned long serial;
/* Just in case everything has gone horribly wrong, give it a kick */
intel_engine_flush_submission(engine);
goto out;
}
- if (engine->wakeref_serial == engine->serial)
+ serial = READ_ONCE(engine->serial);
+ if (engine->wakeref_serial == serial)
goto out;
- mutex_lock(&ce->timeline->mutex);
+ if (!mutex_trylock(&ce->timeline->mutex)) {
+ /* Unable to lock the kernel timeline, is the engine stuck? */
+ if (xchg(&engine->heartbeat.blocked, serial) == serial)
+ intel_gt_handle_error(engine->gt, engine->mask,
+ I915_ERROR_CAPTURE,
+ "no heartbeat on %s",
+ engine->name);
+ goto out;
+ }
intel_context_enter(ce);
rq = __i915_request_create(ce, GFP_NOWAIT | __GFP_NOWARN);