drivers/gpu/drm/msm/msm_ringbuffer.h

   1 /*
   2  * Copyright (C) 2013 Red Hat
   3  * Author: Rob Clark <robdclark@gmail.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 as published by
   7  * the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program.  If not, see <http://www.gnu.org/licenses/>.
  16  */
  17
  18 #ifndef __MSM_RINGBUFFER_H__
  19 #define __MSM_RINGBUFFER_H__
  20
  21 #include "msm_drv.h"
  22
  23 struct msm_ringbuffer {
  24         struct msm_gpu *gpu;
  25         int size;
  26         struct drm_gem_object *bo;
  27         uint32_t *start, *end, *cur;
  28 };
  29
  30 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size);
  31 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring);
  32
  33 /* ringbuffer helpers (the parts that are same for a3xx/a2xx/z180..) */
  34
  35 static inline void
  36 OUT_RING(struct msm_ringbuffer *ring, uint32_t data)
  37 {
  38         if (ring->cur == ring->end)
  39                 ring->cur = ring->start;
  40         *(ring->cur++) = data;
  41 }
  42
  43 #endif /* __MSM_RINGBUFFER_H__ */