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7198e6b0 RC |
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 size) | |
22 | { | |
23 | struct msm_ringbuffer *ring; | |
24 | int ret; | |
25 | ||
26 | size = ALIGN(size, 4); /* size should be dword aligned */ | |
27 | ||
28 | ring = kzalloc(sizeof(*ring), GFP_KERNEL); | |
29 | if (!ring) { | |
30 | ret = -ENOMEM; | |
31 | goto fail; | |
32 | } | |
33 | ||
34 | ring->gpu = gpu; | |
35 | ring->bo = msm_gem_new(gpu->dev, size, MSM_BO_WC); | |
36 | if (IS_ERR(ring->bo)) { | |
37 | ret = PTR_ERR(ring->bo); | |
38 | ring->bo = NULL; | |
39 | goto fail; | |
40 | } | |
41 | ||
42 | ring->start = msm_gem_vaddr_locked(ring->bo); | |
43 | ring->end = ring->start + (size / 4); | |
44 | ring->cur = ring->start; | |
45 | ||
46 | ring->size = size; | |
47 | ||
48 | return ring; | |
49 | ||
50 | fail: | |
51 | if (ring) | |
52 | msm_ringbuffer_destroy(ring); | |
53 | return ERR_PTR(ret); | |
54 | } | |
55 | ||
56 | void msm_ringbuffer_destroy(struct msm_ringbuffer *ring) | |
57 | { | |
58 | if (ring->bo) | |
774449eb | 59 | drm_gem_object_unreference_unlocked(ring->bo); |
7198e6b0 RC |
60 | kfree(ring); |
61 | } |