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 #define rbmemptr(ring, member)  \
  24         ((ring)->memptrs_iova + offsetof(struct msm_rbmemptrs, member))
  25
  26 struct msm_rbmemptrs {
  27         volatile uint32_t rptr;
  28         volatile uint32_t fence;
  29 };
  30
  31 struct msm_ringbuffer {
  32         struct msm_gpu *gpu;
  33         int id;
  34         struct drm_gem_object *bo;
  35         uint32_t *start, *end, *cur, *next;
  36         struct list_head submits;
  37         uint64_t iova;
  38         uint32_t seqno;
  39         uint32_t hangcheck_fence;
  40         struct msm_rbmemptrs *memptrs;
  41         uint64_t memptrs_iova;
  42         struct msm_fence_context *fctx;
  43         spinlock_t lock;
  44 };
  45
  46 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  47                 void *memptrs, uint64_t memptrs_iova);
  48 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring);
  49
  50 /* ringbuffer helpers (the parts that are same for a3xx/a2xx/z180..) */
  51
  52 static inline void
  53 OUT_RING(struct msm_ringbuffer *ring, uint32_t data)
  54 {
  55         /*
  56          * ring->next points to the current command being written - it won't be
  57          * committed as ring->cur until the flush
  58          */
  59         if (ring->next == ring->end)
  60                 ring->next = ring->start;
  61         *(ring->next++) = data;
  62 }
  63
  64 #endif /* __MSM_RINGBUFFER_H__ */