drivers/gpu/drm/i915/intel_frontbuffer.h

   1 /*
   2  * Copyright (c) 2014-2016 Intel Corporation
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice (including the next
  12  * paragraph) shall be included in all copies or substantial portions of the
  13  * Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  16  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  18  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  19  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  20  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  21  * IN THE SOFTWARE.
  22  */
  23
  24 #ifndef __INTEL_FRONTBUFFER_H__
  25 #define __INTEL_FRONTBUFFER_H__
  26
  27 struct drm_i915_private;
  28 struct drm_i915_gem_object;
  29
  30 void intel_frontbuffer_flip_prepare(struct drm_i915_private *dev_priv,
  31                                     unsigned frontbuffer_bits);
  32 void intel_frontbuffer_flip_complete(struct drm_i915_private *dev_priv,
  33                                      unsigned frontbuffer_bits);
  34 void intel_frontbuffer_flip(struct drm_i915_private *dev_priv,
  35                             unsigned frontbuffer_bits);
  36
  37 void __intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
  38                                enum fb_op_origin origin,
  39                                unsigned int frontbuffer_bits);
  40 void __intel_fb_obj_flush(struct drm_i915_gem_object *obj,
  41                           enum fb_op_origin origin,
  42                           unsigned int frontbuffer_bits);
  43
  44 /**
  45  * intel_fb_obj_invalidate - invalidate frontbuffer object
  46  * @obj: GEM object to invalidate
  47  * @origin: which operation caused the invalidation
  48  *
  49  * This function gets called every time rendering on the given object starts and
  50  * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
  51  * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
  52  * until the rendering completes or a flip on this frontbuffer plane is
  53  * scheduled.
  54  */
  55 static inline bool intel_fb_obj_invalidate(struct drm_i915_gem_object *obj,
  56                                            enum fb_op_origin origin)
  57 {
  58         unsigned int frontbuffer_bits;
  59
  60         frontbuffer_bits = atomic_read(&obj->frontbuffer_bits);
  61         if (!frontbuffer_bits)
  62                 return false;
  63
  64         __intel_fb_obj_invalidate(obj, origin, frontbuffer_bits);
  65         return true;
  66 }
  67
  68 /**
  69  * intel_fb_obj_flush - flush frontbuffer object
  70  * @obj: GEM object to flush
  71  * @origin: which operation caused the flush
  72  *
  73  * This function gets called every time rendering on the given object has
  74  * completed and frontbuffer caching can be started again.
  75  */
  76 static inline void intel_fb_obj_flush(struct drm_i915_gem_object *obj,
  77                                       enum fb_op_origin origin)
  78 {
  79         unsigned int frontbuffer_bits;
  80
  81         frontbuffer_bits = atomic_read(&obj->frontbuffer_bits);
  82         if (!frontbuffer_bits)
  83                 return;
  84
  85         __intel_fb_obj_flush(obj, origin, frontbuffer_bits);
  86 }
  87
  88 #endif /* __INTEL_FRONTBUFFER_H__ */