drivers/gpu/drm/msm/msm_ringbuffer.c

   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 #include "msm_ringbuffer.h"
  19 #include "msm_gpu.h"
  20
  21 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
  22                 void *memptrs, uint64_t memptrs_iova)
  23 {
  24         struct msm_ringbuffer *ring;
  25         char name[32];
  26         int ret;
  27
  28         /* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
  29         BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
  30
  31         ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  32         if (!ring) {
  33                 ret = -ENOMEM;
  34                 goto fail;
  35         }
  36
  37         ring->gpu = gpu;
  38         ring->id = id;
  39         /* Pass NULL for the iova pointer - we will map it later */
  40         ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
  41                 MSM_BO_WC, gpu->aspace, &ring->bo, NULL);
  42
  43         if (IS_ERR(ring->start)) {
  44                 ret = PTR_ERR(ring->start);
  45                 ring->start = 0;
  46                 goto fail;
  47         }
  48         ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
  49         ring->next  = ring->start;
  50         ring->cur   = ring->start;
  51
  52         ring->memptrs = memptrs;
  53         ring->memptrs_iova = memptrs_iova;
  54
  55         INIT_LIST_HEAD(&ring->submits);
  56         spin_lock_init(&ring->lock);
  57
  58         snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
  59
  60         ring->fctx = msm_fence_context_alloc(gpu->dev, name);
  61
  62         return ring;
  63
  64 fail:
  65         msm_ringbuffer_destroy(ring);
  66         return ERR_PTR(ret);
  67 }
  68
  69 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
  70 {
  71         if (IS_ERR_OR_NULL(ring))
  72                 return;
  73
  74         msm_fence_context_free(ring->fctx);
  75
  76         if (ring->bo) {
  77                 msm_gem_put_iova(ring->bo, ring->gpu->aspace);
  78                 msm_gem_put_vaddr(ring->bo);
  79                 drm_gem_object_unreference_unlocked(ring->bo);
  80         }
  81         kfree(ring);
  82 }