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 id,
22 		void *memptrs, uint64_t memptrs_iova)
23 {
24 	struct msm_ringbuffer *ring;
25 	char name[32];
26 	int ret;
27 
28 	/* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
29 	BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
30 
31 	ring = kzalloc(sizeof(*ring), GFP_KERNEL);
32 	if (!ring) {
33 		ret = -ENOMEM;
34 		goto fail;
35 	}
36 
37 	ring->gpu = gpu;
38 	ring->id = id;
39 	/* Pass NULL for the iova pointer - we will map it later */
40 	ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
41 		MSM_BO_WC, gpu->aspace, &ring->bo, NULL);
42 
43 	if (IS_ERR(ring->start)) {
44 		ret = PTR_ERR(ring->start);
45 		ring->start = 0;
46 		goto fail;
47 	}
48 	ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
49 	ring->next  = ring->start;
50 	ring->cur   = ring->start;
51 
52 	ring->memptrs = memptrs;
53 	ring->memptrs_iova = memptrs_iova;
54 
55 	INIT_LIST_HEAD(&ring->submits);
56 	spin_lock_init(&ring->lock);
57 
58 	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
59 
60 	ring->fctx = msm_fence_context_alloc(gpu->dev, name);
61 
62 	return ring;
63 
64 fail:
65 	msm_ringbuffer_destroy(ring);
66 	return ERR_PTR(ret);
67 }
68 
69 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
70 {
71 	if (IS_ERR_OR_NULL(ring))
72 		return;
73 
74 	msm_fence_context_free(ring->fctx);
75 
76 	if (ring->bo) {
77 		msm_gem_put_iova(ring->bo, ring->gpu->aspace);
78 		msm_gem_put_vaddr(ring->bo);
79 		drm_gem_object_put_unlocked(ring->bo);
80 	}
81 	kfree(ring);
82 }
83