LCOV - code coverage report
Current view: top level - drivers/gpu/drm/i915/display - intel_frontbuffer.h (source / functions) Hit Total Coverage
Test: combined.info Lines: 0 26 0.0 %
Date: 2022-04-01 14:17:54 Functions: 0 3 0.0 %
Branches: 0 18 0.0 %

           Branch data     Line data    Source code
       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                 :            : #include <linux/atomic.h>
      28                 :            : #include <linux/kref.h>
      29                 :            : 
      30                 :            : #include "gem/i915_gem_object_types.h"
      31                 :            : #include "i915_active.h"
      32                 :            : 
      33                 :            : struct drm_i915_private;
      34                 :            : 
      35                 :            : enum fb_op_origin {
      36                 :            :         ORIGIN_GTT,
      37                 :            :         ORIGIN_CPU,
      38                 :            :         ORIGIN_CS,
      39                 :            :         ORIGIN_FLIP,
      40                 :            :         ORIGIN_DIRTYFB,
      41                 :            : };
      42                 :            : 
      43                 :            : struct intel_frontbuffer {
      44                 :            :         struct kref ref;
      45                 :            :         atomic_t bits;
      46                 :            :         struct i915_active write;
      47                 :            :         struct drm_i915_gem_object *obj;
      48                 :            :         struct rcu_head rcu;
      49                 :            : };
      50                 :            : 
      51                 :            : void intel_frontbuffer_flip_prepare(struct drm_i915_private *i915,
      52                 :            :                                     unsigned frontbuffer_bits);
      53                 :            : void intel_frontbuffer_flip_complete(struct drm_i915_private *i915,
      54                 :            :                                      unsigned frontbuffer_bits);
      55                 :            : void intel_frontbuffer_flip(struct drm_i915_private *i915,
      56                 :            :                             unsigned frontbuffer_bits);
      57                 :            : 
      58                 :            : void intel_frontbuffer_put(struct intel_frontbuffer *front);
      59                 :            : 
      60                 :            : static inline struct intel_frontbuffer *
      61                 :          0 : __intel_frontbuffer_get(const struct drm_i915_gem_object *obj)
      62                 :            : {
      63                 :          0 :         struct intel_frontbuffer *front;
      64                 :            : 
      65         [ #  # ]:          0 :         if (likely(!rcu_access_pointer(obj->frontbuffer)))
      66                 :            :                 return NULL;
      67                 :            : 
      68                 :          0 :         rcu_read_lock();
      69                 :          0 :         do {
      70         [ #  # ]:          0 :                 front = rcu_dereference(obj->frontbuffer);
      71         [ #  # ]:          0 :                 if (!front)
      72                 :            :                         break;
      73                 :            : 
      74         [ #  # ]:          0 :                 if (unlikely(!kref_get_unless_zero(&front->ref)))
      75                 :          0 :                         continue;
      76                 :            : 
      77         [ #  # ]:          0 :                 if (likely(front == rcu_access_pointer(obj->frontbuffer)))
      78                 :            :                         break;
      79                 :            : 
      80                 :          0 :                 intel_frontbuffer_put(front);
      81                 :            :         } while (1);
      82                 :          0 :         rcu_read_unlock();
      83                 :            : 
      84                 :          0 :         return front;
      85                 :            : }
      86                 :            : 
      87                 :            : struct intel_frontbuffer *
      88                 :            : intel_frontbuffer_get(struct drm_i915_gem_object *obj);
      89                 :            : 
      90                 :            : void __intel_fb_invalidate(struct intel_frontbuffer *front,
      91                 :            :                            enum fb_op_origin origin,
      92                 :            :                            unsigned int frontbuffer_bits);
      93                 :            : 
      94                 :            : /**
      95                 :            :  * intel_frontbuffer_invalidate - invalidate frontbuffer object
      96                 :            :  * @front: GEM object to invalidate
      97                 :            :  * @origin: which operation caused the invalidation
      98                 :            :  *
      99                 :            :  * This function gets called every time rendering on the given object starts and
     100                 :            :  * frontbuffer caching (fbc, low refresh rate for DRRS, panel self refresh) must
     101                 :            :  * be invalidated. For ORIGIN_CS any subsequent invalidation will be delayed
     102                 :            :  * until the rendering completes or a flip on this frontbuffer plane is
     103                 :            :  * scheduled.
     104                 :            :  */
     105                 :          0 : static inline bool intel_frontbuffer_invalidate(struct intel_frontbuffer *front,
     106                 :            :                                                 enum fb_op_origin origin)
     107                 :            : {
     108                 :          0 :         unsigned int frontbuffer_bits;
     109                 :            : 
     110         [ #  # ]:          0 :         if (!front)
     111                 :            :                 return false;
     112                 :            : 
     113                 :          0 :         frontbuffer_bits = atomic_read(&front->bits);
     114         [ #  # ]:          0 :         if (!frontbuffer_bits)
     115                 :            :                 return false;
     116                 :            : 
     117                 :          0 :         __intel_fb_invalidate(front, origin, frontbuffer_bits);
     118                 :          0 :         return true;
     119                 :            : }
     120                 :            : 
     121                 :            : void __intel_fb_flush(struct intel_frontbuffer *front,
     122                 :            :                       enum fb_op_origin origin,
     123                 :            :                       unsigned int frontbuffer_bits);
     124                 :            : 
     125                 :            : /**
     126                 :            :  * intel_frontbuffer_flush - flush frontbuffer object
     127                 :            :  * @front: GEM object to flush
     128                 :            :  * @origin: which operation caused the flush
     129                 :            :  *
     130                 :            :  * This function gets called every time rendering on the given object has
     131                 :            :  * completed and frontbuffer caching can be started again.
     132                 :            :  */
     133                 :          0 : static inline void intel_frontbuffer_flush(struct intel_frontbuffer *front,
     134                 :            :                                            enum fb_op_origin origin)
     135                 :            : {
     136                 :          0 :         unsigned int frontbuffer_bits;
     137                 :            : 
     138         [ #  # ]:          0 :         if (!front)
     139                 :            :                 return;
     140                 :            : 
     141                 :          0 :         frontbuffer_bits = atomic_read(&front->bits);
     142         [ #  # ]:          0 :         if (!frontbuffer_bits)
     143                 :            :                 return;
     144                 :            : 
     145                 :          0 :         __intel_fb_flush(front, origin, frontbuffer_bits);
     146                 :            : }
     147                 :            : 
     148                 :            : void intel_frontbuffer_track(struct intel_frontbuffer *old,
     149                 :            :                              struct intel_frontbuffer *new,
     150                 :            :                              unsigned int frontbuffer_bits);
     151                 :            : 
     152                 :            : #endif /* __INTEL_FRONTBUFFER_H__ */

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