@@ -78,6 +78,7 @@ gt-y += \
gt/intel_breadcrumbs.o \
gt/intel_context.o \
gt/intel_engine_cs.o \
+ gt/intel_engine_heartbeat.o \
gt/intel_engine_pm.o \
gt/intel_engine_pool.o \
gt/intel_engine_sysfs.o \
new file mode 100644
@@ -0,0 +1,56 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2019 Intel Corporation
+ */
+
+#include "i915_request.h"
+
+#include "intel_context.h"
+#include "intel_engine_heartbeat.h"
+#include "intel_engine_pm.h"
+#include "intel_engine.h"
+#include "intel_gt.h"
+
+static void idle_pulse(struct intel_engine_cs *engine, struct i915_request *rq)
+{
+ engine->wakeref_serial = READ_ONCE(engine->serial) + 1;
+ i915_request_add_active_barriers(rq);
+}
+
+int intel_engine_pulse(struct intel_engine_cs *engine)
+{
+ struct i915_sched_attr attr = { .priority = I915_PRIORITY_BARRIER };
+ struct intel_context *ce = engine->kernel_context;
+ struct i915_request *rq;
+ int err = 0;
+
+ if (!intel_engine_has_preemption(engine))
+ return -ENODEV;
+
+ if (!intel_engine_pm_get_if_awake(engine))
+ return 0;
+
+ if (mutex_lock_interruptible(&ce->timeline->mutex))
+ goto out_rpm;
+
+ intel_context_enter(ce);
+ rq = __i915_request_create(ce, GFP_NOWAIT | __GFP_NOWARN);
+ intel_context_exit(ce);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto out_unlock;
+ }
+
+ rq->flags |= I915_REQUEST_SENTINEL;
+ idle_pulse(engine, rq);
+
+ __i915_request_commit(rq);
+ __i915_request_queue(rq, &attr);
+
+out_unlock:
+ mutex_unlock(&ce->timeline->mutex);
+out_rpm:
+ intel_engine_pm_put(engine);
+ return err;
+}
new file mode 100644
@@ -0,0 +1,14 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2019 Intel Corporation
+ */
+
+#ifndef INTEL_ENGINE_HEARTBEAT_H
+#define INTEL_ENGINE_HEARTBEAT_H
+
+struct intel_engine_cs;
+
+int intel_engine_pulse(struct intel_engine_cs *engine);
+
+#endif /* INTEL_ENGINE_HEARTBEAT_H */
@@ -111,7 +111,7 @@ static bool switch_to_kernel_context(struct intel_engine_cs *engine)
i915_request_add_active_barriers(rq);
/* Install ourselves as a preemption barrier */
- rq->sched.attr.priority = I915_PRIORITY_UNPREEMPTABLE;
+ rq->sched.attr.priority = I915_PRIORITY_BARRIER;
__i915_request_commit(rq);
/* Release our exclusive hold on the engine */
@@ -39,6 +39,7 @@ enum {
* active request.
*/
#define I915_PRIORITY_UNPREEMPTABLE INT_MAX
+#define I915_PRIORITY_BARRIER INT_MAX
#define __NO_PREEMPTION (I915_PRIORITY_WAIT)