LXR linux/drivers/gpu/drm/msm/msm

   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
  21struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
  22{
  23        struct msm_ringbuffer *ring;
  24        int ret;
  25
  26        if (WARN_ON(!is_power_of_2(size)))
  27                return ERR_PTR(-EINVAL);
  28
  29        ring = kzalloc(sizeof(*ring), GFP_KERNEL);
  30        if (!ring) {
  31                ret = -ENOMEM;
  32                goto fail;
  33        }
  34
  35        ring->gpu = gpu;
  36
  37        /* Pass NULL for the iova pointer - we will map it later */
  38        ring->start = msm_gem_kernel_new(gpu->dev, size, MSM_BO_WC,
  39                gpu->aspace, &ring->bo, NULL);
  40
  41        if (IS_ERR(ring->start)) {
  42                ret = PTR_ERR(ring->start);
  43                ring->start = 0;
  44                goto fail;
  45        }
  46        ring->end   = ring->start + (size / 4);
  47        ring->cur   = ring->start;
  48
  49        ring->size = size;
  50
  51        return ring;
  52
  53fail:
  54        if (ring)
  55                msm_ringbuffer_destroy(ring);
  56        return ERR_PTR(ret);
  57}
  58
  59void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
  60{
  61        if (ring->bo) {
  62                msm_gem_put_vaddr(ring->bo);
  63                drm_gem_object_unreference_unlocked(ring->bo);
  64        }
  65        kfree(ring);
  66}
  67