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 *etnaviv_sched_run_job(struct drm_sched_job *sched_job)
21 {
22 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
23 	struct dma_fence *fence = NULL;
24 
25 	if (likely(!sched_job->s_fence->finished.error))
26 		fence = etnaviv_gpu_submit(submit);
27 	else
28 		dev_dbg(submit->gpu->dev, "skipping bad job\n");
29 
30 	return fence;
31 }
32 
33 static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
34 							  *sched_job)
35 {
36 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
37 	struct etnaviv_gpu *gpu = submit->gpu;
38 	u32 dma_addr;
39 	int change;
40 
41 	/* block scheduler */
42 	drm_sched_stop(&gpu->sched, sched_job);
43 
44 	/*
45 	 * If the GPU managed to complete this jobs fence, the timout is
46 	 * spurious. Bail out.
47 	 */
48 	if (dma_fence_is_signaled(submit->out_fence))
49 		goto out_no_timeout;
50 
51 	/*
52 	 * If the GPU is still making forward progress on the front-end (which
53 	 * should never loop) we shift out the timeout to give it a chance to
54 	 * finish the job.
55 	 */
56 	dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
57 	change = dma_addr - gpu->hangcheck_dma_addr;
58 	if (gpu->completed_fence != gpu->hangcheck_fence ||
59 	    change < 0 || change > 16) {
60 		gpu->hangcheck_dma_addr = dma_addr;
61 		gpu->hangcheck_fence = gpu->completed_fence;
62 		goto out_no_timeout;
63 	}
64 
65 	if(sched_job)
66 		drm_sched_increase_karma(sched_job);
67 
68 	/* get the GPU back into the init state */
69 	etnaviv_core_dump(submit);
70 	etnaviv_gpu_recover_hang(submit);
71 
72 	drm_sched_resubmit_jobs(&gpu->sched);
73 
74 	drm_sched_start(&gpu->sched, true);
75 	return DRM_GPU_SCHED_STAT_NOMINAL;
76 
77 out_no_timeout:
78 	/* restart scheduler after GPU is usable again */
79 	drm_sched_start(&gpu->sched, true);
80 	return DRM_GPU_SCHED_STAT_NOMINAL;
81 }
82 
83 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
84 {
85 	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
86 
87 	drm_sched_job_cleanup(sched_job);
88 
89 	etnaviv_submit_put(submit);
90 }
91 
92 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
93 	.run_job = etnaviv_sched_run_job,
94 	.timedout_job = etnaviv_sched_timedout_job,
95 	.free_job = etnaviv_sched_free_job,
96 };
97 
98 int etnaviv_sched_push_job(struct etnaviv_gem_submit *submit)
99 {
100 	int ret = 0;
101 
102 	/*
103 	 * Hold the fence lock across the whole operation to avoid jobs being
104 	 * pushed out of order with regard to their sched fence seqnos as
105 	 * allocated in drm_sched_job_arm.
106 	 */
107 	mutex_lock(&submit->gpu->fence_lock);
108 
109 	drm_sched_job_arm(&submit->sched_job);
110 
111 	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
112 	submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
113 						submit->out_fence, 0,
114 						INT_MAX, GFP_KERNEL);
115 	if (submit->out_fence_id < 0) {
116 		drm_sched_job_cleanup(&submit->sched_job);
117 		ret = -ENOMEM;
118 		goto out_unlock;
119 	}
120 
121 	/* the scheduler holds on to the job now */
122 	kref_get(&submit->refcount);
123 
124 	drm_sched_entity_push_job(&submit->sched_job);
125 
126 out_unlock:
127 	mutex_unlock(&submit->gpu->fence_lock);
128 
129 	return ret;
130 }
131 
132 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
133 {
134 	int ret;
135 
136 	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
137 			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
138 			     msecs_to_jiffies(500), NULL, NULL,
139 			     dev_name(gpu->dev), gpu->dev);
140 	if (ret)
141 		return ret;
142 
143 	return 0;
144 }
145 
146 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
147 {
148 	drm_sched_fini(&gpu->sched);
149 }
150