drivers/gpu/drm/i915/gt/intel_engine_pm.h

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2019 Intel Corporation
   5  */
   6
   7 #ifndef INTEL_ENGINE_PM_H
   8 #define INTEL_ENGINE_PM_H
   9
  10 #include "i915_request.h"
  11 #include "intel_engine_types.h"
  12 #include "intel_wakeref.h"
  13
  14 static inline bool
  15 intel_engine_pm_is_awake(const struct intel_engine_cs *engine)
  16 {
  17         return intel_wakeref_is_active(&engine->wakeref);
  18 }
  19
  20 static inline void intel_engine_pm_get(struct intel_engine_cs *engine)
  21 {
  22         intel_wakeref_get(&engine->wakeref);
  23 }
  24
  25 static inline bool intel_engine_pm_get_if_awake(struct intel_engine_cs *engine)
  26 {
  27         return intel_wakeref_get_if_active(&engine->wakeref);
  28 }
  29
  30 static inline void intel_engine_pm_put(struct intel_engine_cs *engine)
  31 {
  32         intel_wakeref_put(&engine->wakeref);
  33 }
  34
  35 static inline void intel_engine_pm_put_async(struct intel_engine_cs *engine)
  36 {
  37         intel_wakeref_put_async(&engine->wakeref);
  38 }
  39
  40 static inline void intel_engine_pm_flush(struct intel_engine_cs *engine)
  41 {
  42         intel_wakeref_unlock_wait(&engine->wakeref);
  43 }
  44
  45 static inline struct i915_request *
  46 intel_engine_create_kernel_request(struct intel_engine_cs *engine)
  47 {
  48         struct i915_request *rq;
  49
  50         /*
  51          * The engine->kernel_context is special as it is used inside
  52          * the engine-pm barrier (see __engine_park()), circumventing
  53          * the usual mutexes and relying on the engine-pm barrier
  54          * instead. So whenever we use the engine->kernel_context
  55          * outside of the barrier, we must manually handle the
  56          * engine wakeref to serialise with the use inside.
  57          */
  58         intel_engine_pm_get(engine);
  59         rq = i915_request_create(engine->kernel_context);
  60         intel_engine_pm_put(engine);
  61
  62         return rq;
  63 }
  64
  65 void intel_engine_init__pm(struct intel_engine_cs *engine);
  66
  67 #endif /* INTEL_ENGINE_PM_H */