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
msm_ringbuffer_new(struct msm_gpu * gpu,int size)21 struct 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
53 fail:
54 if (ring)
55 msm_ringbuffer_destroy(ring);
56 return ERR_PTR(ret);
57 }
58
msm_ringbuffer_destroy(struct msm_ringbuffer * ring)59 void 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