1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) 2013 Red Hat
4  * Author: Rob Clark <robdclark@gmail.com>
5  */
6 
7 #include "msm_ringbuffer.h"
8 #include "msm_gpu.h"
9 
10 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
11 		void *memptrs, uint64_t memptrs_iova)
12 {
13 	struct msm_ringbuffer *ring;
14 	char name[32];
15 	int ret;
16 
17 	/* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
18 	BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
19 
20 	ring = kzalloc(sizeof(*ring), GFP_KERNEL);
21 	if (!ring) {
22 		ret = -ENOMEM;
23 		goto fail;
24 	}
25 
26 	ring->gpu = gpu;
27 	ring->id = id;
28 
29 	ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
30 		MSM_BO_WC | MSM_BO_GPU_READONLY, gpu->aspace, &ring->bo,
31 		&ring->iova);
32 
33 	if (IS_ERR(ring->start)) {
34 		ret = PTR_ERR(ring->start);
35 		ring->start = 0;
36 		goto fail;
37 	}
38 
39 	msm_gem_object_set_name(ring->bo, "ring%d", id);
40 
41 	ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
42 	ring->next  = ring->start;
43 	ring->cur   = ring->start;
44 
45 	ring->memptrs = memptrs;
46 	ring->memptrs_iova = memptrs_iova;
47 
48 	INIT_LIST_HEAD(&ring->submits);
49 	spin_lock_init(&ring->lock);
50 
51 	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
52 
53 	ring->fctx = msm_fence_context_alloc(gpu->dev, name);
54 
55 	return ring;
56 
57 fail:
58 	msm_ringbuffer_destroy(ring);
59 	return ERR_PTR(ret);
60 }
61 
62 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
63 {
64 	if (IS_ERR_OR_NULL(ring))
65 		return;
66 
67 	msm_fence_context_free(ring->fctx);
68 
69 	msm_gem_kernel_put(ring->bo, ring->gpu->aspace, false);
70 
71 	kfree(ring);
72 }
73