1 // SPDX-License-Identifier: GPL-2.0
2 /*
3  * Copyright (C) 2017 Etnaviv Project
4  */
5 
6 #include <linux/moduleparam.h>
7 
8 #include "etnaviv_drv.h"
9 #include "etnaviv_dump.h"
10 #include "etnaviv_gem.h"
11 #include "etnaviv_gpu.h"
12 #include "etnaviv_sched.h"
13 #include "state.xml.h"
14 
15 static int etnaviv_job_hang_limit = 0;
16 module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444);
17 static int etnaviv_hw_jobs_limit = 4;
18 module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444);
19 
20 static struct dma_fence *
21 etnaviv_sched_dependency(struct drm_sched_job *sched_job,
22 			 struct drm_sched_entity *entity)
23 {
24 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
25 	struct dma_fence *fence;
26 	int i;
27 
28 	if (unlikely(submit->in_fence)) {
29 		fence = submit->in_fence;
30 		submit->in_fence = NULL;
31 
32 		if (!dma_fence_is_signaled(fence))
33 			return fence;
34 
35 		dma_fence_put(fence);
36 	}
37 
38 	for (i = 0; i < submit->nr_bos; i++) {
39 		struct etnaviv_gem_submit_bo *bo = &submit->bos[i];
40 		int j;
41 
42 		for (j = 0; j < bo->nr_fences; j++) {
43 			if (!bo->fences[j])
44 				continue;
45 
46 			fence = bo->fences[j];
47 			bo->fences[j] = NULL;
48 
49 			if (!dma_fence_is_signaled(fence))
50 				return fence;
51 
52 			dma_fence_put(fence);
53 		}
54 		kfree(bo->fences);
55 		bo->nr_fences = 0;
56 		bo->fences = NULL;
57 	}
58 
59 	return NULL;
60 }
61 
62 static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job)
63 {
64 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
65 	struct dma_fence *fence = NULL;
66 
67 	if (likely(!sched_job->s_fence->finished.error))
68 		fence = etnaviv_gpu_submit(submit);
69 	else
70 		dev_dbg(submit->gpu->dev, "skipping bad job\n");
71 
72 	return fence;
73 }
74 
75 static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
76 							  *sched_job)
77 {
78 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
79 	struct etnaviv_gpu *gpu = submit->gpu;
80 	u32 dma_addr;
81 	int change;
82 
83 	/* block scheduler */
84 	drm_sched_stop(&gpu->sched, sched_job);
85 
86 	/*
87 	 * If the GPU managed to complete this jobs fence, the timout is
88 	 * spurious. Bail out.
89 	 */
90 	if (dma_fence_is_signaled(submit->out_fence))
91 		goto out_no_timeout;
92 
93 	/*
94 	 * If the GPU is still making forward progress on the front-end (which
95 	 * should never loop) we shift out the timeout to give it a chance to
96 	 * finish the job.
97 	 */
98 	dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
99 	change = dma_addr - gpu->hangcheck_dma_addr;
100 	if (gpu->completed_fence != gpu->hangcheck_fence ||
101 	    change < 0 || change > 16) {
102 		gpu->hangcheck_dma_addr = dma_addr;
103 		gpu->hangcheck_fence = gpu->completed_fence;
104 		goto out_no_timeout;
105 	}
106 
107 	if(sched_job)
108 		drm_sched_increase_karma(sched_job);
109 
110 	/* get the GPU back into the init state */
111 	etnaviv_core_dump(submit);
112 	etnaviv_gpu_recover_hang(gpu);
113 
114 	drm_sched_resubmit_jobs(&gpu->sched);
115 
116 	drm_sched_start(&gpu->sched, true);
117 	return DRM_GPU_SCHED_STAT_NOMINAL;
118 
119 out_no_timeout:
120 	/* restart scheduler after GPU is usable again */
121 	drm_sched_start(&gpu->sched, true);
122 	return DRM_GPU_SCHED_STAT_NOMINAL;
123 }
124 
125 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
126 {
127 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
128 
129 	drm_sched_job_cleanup(sched_job);
130 
131 	etnaviv_submit_put(submit);
132 }
133 
134 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
135 	.dependency = etnaviv_sched_dependency,
136 	.run_job = etnaviv_sched_run_job,
137 	.timedout_job = etnaviv_sched_timedout_job,
138 	.free_job = etnaviv_sched_free_job,
139 };
140 
141 int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
142 			   struct etnaviv_gem_submit *submit)
143 {
144 	int ret = 0;
145 
146 	/*
147 	 * Hold the fence lock across the whole operation to avoid jobs being
148 	 * pushed out of order with regard to their sched fence seqnos as
149 	 * allocated in drm_sched_job_init.
150 	 */
151 	mutex_lock(&submit->gpu->fence_lock);
152 
153 	ret = drm_sched_job_init(&submit->sched_job, sched_entity,
154 				 submit->ctx);
155 	if (ret)
156 		goto out_unlock;
157 
158 	drm_sched_job_arm(&submit->sched_job);
159 
160 	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
161 	submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
162 						submit->out_fence, 0,
163 						INT_MAX, GFP_KERNEL);
164 	if (submit->out_fence_id < 0) {
165 		drm_sched_job_cleanup(&submit->sched_job);
166 		ret = -ENOMEM;
167 		goto out_unlock;
168 	}
169 
170 	/* the scheduler holds on to the job now */
171 	kref_get(&submit->refcount);
172 
173 	drm_sched_entity_push_job(&submit->sched_job);
174 
175 out_unlock:
176 	mutex_unlock(&submit->gpu->fence_lock);
177 
178 	return ret;
179 }
180 
181 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
182 {
183 	int ret;
184 
185 	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
186 			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
187 			     msecs_to_jiffies(500), NULL, NULL,
188 			     dev_name(gpu->dev), gpu->dev);
189 	if (ret)
190 		return ret;
191 
192 	return 0;
193 }
194 
195 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
196 {
197 	drm_sched_fini(&gpu->sched);
198 }
199