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		check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
31		gpu->aspace, &ring->bo, &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
57fail:
58	msm_ringbuffer_destroy(ring);
59	return ERR_PTR(ret);
60}
61
62void 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}