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
10struct 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, gpu->aspace, &ring->bo, &ring->iova);
31
32	if (IS_ERR(ring->start)) {
33		ret = PTR_ERR(ring->start);
34		ring->start = 0;
35		goto fail;
36	}
37
38	msm_gem_object_set_name(ring->bo, "ring%d", id);
39
40	ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
41	ring->next  = ring->start;
42	ring->cur   = ring->start;
43
44	ring->memptrs = memptrs;
45	ring->memptrs_iova = memptrs_iova;
46
47	INIT_LIST_HEAD(&ring->submits);
48	spin_lock_init(&ring->lock);
49
50	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
51
52	ring->fctx = msm_fence_context_alloc(gpu->dev, name);
53
54	return ring;
55
56fail:
57	msm_ringbuffer_destroy(ring);
58	return ERR_PTR(ret);
59}
60
61void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
62{
63	if (IS_ERR_OR_NULL(ring))
64		return;
65
66	msm_fence_context_free(ring->fctx);
67
68	msm_gem_kernel_put(ring->bo, ring->gpu->aspace, false);
69
70	kfree(ring);
71}