2 * Copyright (C) 2013 Red Hat
3 * Author: Rob Clark <robdclark@gmail.com>
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.
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
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/>.
18 #include "msm_ringbuffer.h"
21 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int size)
23 struct msm_ringbuffer *ring;
26 if (WARN_ON(!is_power_of_2(size)))
27 return ERR_PTR(-EINVAL);
29 ring = kzalloc(sizeof(*ring), GFP_KERNEL);
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);
41 if (IS_ERR(ring->start)) {
42 ret = PTR_ERR(ring->start);
46 ring->end = ring->start + (size / 4);
47 ring->cur = ring->start;
55 msm_ringbuffer_destroy(ring);
59 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
62 msm_gem_put_vaddr(ring->bo);
63 drm_gem_object_unreference_unlocked(ring->bo);