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 	if (IS_ERR(ring->start)) {
44 		ret = PTR_ERR(ring->start);
45 		goto fail;
46 	}
47 	ring->end   = ring->start + (size / 4);
48 	ring->cur   = ring->start;
49 
50 	ring->size = size;
51 
52 	return ring;
53 
54 fail:
55 	if (ring)
56 		msm_ringbuffer_destroy(ring);
57 	return ERR_PTR(ret);
58 }
59 
60 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
61 {
62 	if (ring->bo)
63 		drm_gem_object_unreference_unlocked(ring->bo);
64 	kfree(ring);
65 }
66