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 	/*
42 	 * If the GPU managed to complete this jobs fence, the timout is
43 	 * spurious. Bail out.
44 	 */
45 	if (dma_fence_is_signaled(submit->out_fence))
46 		goto out_no_timeout;
47 
48 	/*
49 	 * If the GPU is still making forward progress on the front-end (which
50 	 * should never loop) we shift out the timeout to give it a chance to
51 	 * finish the job.
52 	 */
53 	dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
54 	change = dma_addr - gpu->hangcheck_dma_addr;
55 	if (gpu->state == ETNA_GPU_STATE_RUNNING &&
56 	    (gpu->completed_fence != gpu->hangcheck_fence ||
57 	     change < 0 || change > 16)) {
58 		gpu->hangcheck_dma_addr = dma_addr;
59 		gpu->hangcheck_fence = gpu->completed_fence;
60 		goto out_no_timeout;
61 	}
62 
63 	/* block scheduler */
64 	drm_sched_stop(&gpu->sched, sched_job);
65 
66 	if(sched_job)
67 		drm_sched_increase_karma(sched_job);
68 
69 	/* get the GPU back into the init state */
70 	etnaviv_core_dump(submit);
71 	etnaviv_gpu_recover_hang(submit);
72 
73 	drm_sched_resubmit_jobs(&gpu->sched);
74 
75 	drm_sched_start(&gpu->sched, true);
76 	return DRM_GPU_SCHED_STAT_NOMINAL;
77 
78 out_no_timeout:
79 	list_add(&sched_job->list, &sched_job->sched->pending_list);
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 	struct etnaviv_gpu *gpu = submit->gpu;
101 	int ret;
102 
103 	/*
104 	 * Hold the sched lock across the whole operation to avoid jobs being
105 	 * pushed out of order with regard to their sched fence seqnos as
106 	 * allocated in drm_sched_job_arm.
107 	 */
108 	mutex_lock(&gpu->sched_lock);
109 
110 	drm_sched_job_arm(&submit->sched_job);
111 
112 	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
113 	ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
114 			      submit->out_fence, xa_limit_32b,
115 			      &gpu->next_user_fence, GFP_KERNEL);
116 	if (ret < 0) {
117 		drm_sched_job_cleanup(&submit->sched_job);
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(&gpu->sched_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