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 static uint num_hw_submissions = 8;
11 MODULE_PARM_DESC(num_hw_submissions, "The max # of jobs to write into ringbuffer (default 8)");
12 module_param(num_hw_submissions, uint, 0600);
13 
14 static struct dma_fence *msm_job_run(struct drm_sched_job *job)
15 {
16 	struct msm_gem_submit *submit = to_msm_submit(job);
17 	struct msm_fence_context *fctx = submit->ring->fctx;
18 	struct msm_gpu *gpu = submit->gpu;
19 	struct msm_drm_private *priv = gpu->dev->dev_private;
20 	int i;
21 
22 	msm_fence_init(submit->hw_fence, fctx);
23 
24 	submit->seqno = submit->hw_fence->seqno;
25 
26 	mutex_lock(&priv->lru.lock);
27 
28 	for (i = 0; i < submit->nr_bos; i++) {
29 		struct drm_gem_object *obj = submit->bos[i].obj;
30 
31 		msm_gem_unpin_active(obj);
32 		submit->bos[i].flags &= ~BO_PINNED;
33 	}
34 
35 	mutex_unlock(&priv->lru.lock);
36 
37 	msm_gpu_submit(gpu, submit);
38 
39 	return dma_fence_get(submit->hw_fence);
40 }
41 
42 static void msm_job_free(struct drm_sched_job *job)
43 {
44 	struct msm_gem_submit *submit = to_msm_submit(job);
45 
46 	drm_sched_job_cleanup(job);
47 	msm_gem_submit_put(submit);
48 }
49 
50 static const struct drm_sched_backend_ops msm_sched_ops = {
51 	.run_job = msm_job_run,
52 	.free_job = msm_job_free
53 };
54 
55 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
56 		void *memptrs, uint64_t memptrs_iova)
57 {
58 	struct msm_ringbuffer *ring;
59 	long sched_timeout;
60 	char name[32];
61 	int ret;
62 
63 	/* We assume everwhere that MSM_GPU_RINGBUFFER_SZ is a power of 2 */
64 	BUILD_BUG_ON(!is_power_of_2(MSM_GPU_RINGBUFFER_SZ));
65 
66 	ring = kzalloc(sizeof(*ring), GFP_KERNEL);
67 	if (!ring) {
68 		ret = -ENOMEM;
69 		goto fail;
70 	}
71 
72 	ring->gpu = gpu;
73 	ring->id = id;
74 
75 	ring->start = msm_gem_kernel_new(gpu->dev, MSM_GPU_RINGBUFFER_SZ,
76 		check_apriv(gpu, MSM_BO_WC | MSM_BO_GPU_READONLY),
77 		gpu->aspace, &ring->bo, &ring->iova);
78 
79 	if (IS_ERR(ring->start)) {
80 		ret = PTR_ERR(ring->start);
81 		ring->start = NULL;
82 		goto fail;
83 	}
84 
85 	msm_gem_object_set_name(ring->bo, "ring%d", id);
86 
87 	ring->end   = ring->start + (MSM_GPU_RINGBUFFER_SZ >> 2);
88 	ring->next  = ring->start;
89 	ring->cur   = ring->start;
90 
91 	ring->memptrs = memptrs;
92 	ring->memptrs_iova = memptrs_iova;
93 
94 	 /* currently managing hangcheck ourselves: */
95 	sched_timeout = MAX_SCHEDULE_TIMEOUT;
96 
97 	ret = drm_sched_init(&ring->sched, &msm_sched_ops,
98 			num_hw_submissions, 0, sched_timeout,
99 			NULL, NULL, to_msm_bo(ring->bo)->name, gpu->dev->dev);
100 	if (ret) {
101 		goto fail;
102 	}
103 
104 	INIT_LIST_HEAD(&ring->submits);
105 	spin_lock_init(&ring->submit_lock);
106 	spin_lock_init(&ring->preempt_lock);
107 
108 	snprintf(name, sizeof(name), "gpu-ring-%d", ring->id);
109 
110 	ring->fctx = msm_fence_context_alloc(gpu->dev, &ring->memptrs->fence, name);
111 
112 	return ring;
113 
114 fail:
115 	msm_ringbuffer_destroy(ring);
116 	return ERR_PTR(ret);
117 }
118 
119 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring)
120 {
121 	if (IS_ERR_OR_NULL(ring))
122 		return;
123 
124 	drm_sched_fini(&ring->sched);
125 
126 	msm_fence_context_free(ring->fctx);
127 
128 	msm_gem_kernel_put(ring->bo, ring->gpu->aspace);
129 
130 	kfree(ring);
131 }
132