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
etnaviv_sched_run_job(struct drm_sched_job * sched_job)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
etnaviv_sched_timedout_job(struct drm_sched_job * sched_job)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 drm_gpu_scheduler *sched = sched_job->sched;
38 struct etnaviv_gpu *gpu = submit->gpu;
39 u32 dma_addr;
40 int change;
41
42 /*
43 * If the GPU managed to complete this jobs fence, the timout is
44 * spurious. Bail out.
45 */
46 if (dma_fence_is_signaled(submit->out_fence))
47 goto out_no_timeout;
48
49 /*
50 * If the GPU is still making forward progress on the front-end (which
51 * should never loop) we shift out the timeout to give it a chance to
52 * finish the job.
53 */
54 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
55 change = dma_addr - gpu->hangcheck_dma_addr;
56 if (gpu->state == ETNA_GPU_STATE_RUNNING &&
57 (gpu->completed_fence != gpu->hangcheck_fence ||
58 change < 0 || change > 16)) {
59 gpu->hangcheck_dma_addr = dma_addr;
60 gpu->hangcheck_fence = gpu->completed_fence;
61 goto out_no_timeout;
62 }
63
64 /* block scheduler */
65 drm_sched_stop(&gpu->sched, sched_job);
66
67 if(sched_job)
68 drm_sched_increase_karma(sched_job);
69
70 /* get the GPU back into the init state */
71 etnaviv_core_dump(submit);
72 etnaviv_gpu_recover_hang(submit);
73
74 drm_sched_resubmit_jobs(&gpu->sched);
75
76 drm_sched_start(&gpu->sched, true);
77 return DRM_GPU_SCHED_STAT_NOMINAL;
78
79 out_no_timeout:
80 spin_lock(&sched->job_list_lock);
81 list_add(&sched_job->list, &sched->pending_list);
82 spin_unlock(&sched->job_list_lock);
83 return DRM_GPU_SCHED_STAT_NOMINAL;
84 }
85
etnaviv_sched_free_job(struct drm_sched_job * sched_job)86 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
87 {
88 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
89
90 drm_sched_job_cleanup(sched_job);
91
92 etnaviv_submit_put(submit);
93 }
94
95 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
96 .run_job = etnaviv_sched_run_job,
97 .timedout_job = etnaviv_sched_timedout_job,
98 .free_job = etnaviv_sched_free_job,
99 };
100
etnaviv_sched_push_job(struct etnaviv_gem_submit * submit)101 int etnaviv_sched_push_job(struct etnaviv_gem_submit *submit)
102 {
103 struct etnaviv_gpu *gpu = submit->gpu;
104 int ret;
105
106 /*
107 * Hold the sched lock across the whole operation to avoid jobs being
108 * pushed out of order with regard to their sched fence seqnos as
109 * allocated in drm_sched_job_arm.
110 */
111 mutex_lock(&gpu->sched_lock);
112
113 drm_sched_job_arm(&submit->sched_job);
114
115 submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
116 ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
117 submit->out_fence, xa_limit_32b,
118 &gpu->next_user_fence, GFP_KERNEL);
119 if (ret < 0) {
120 drm_sched_job_cleanup(&submit->sched_job);
121 goto out_unlock;
122 }
123
124 /* the scheduler holds on to the job now */
125 kref_get(&submit->refcount);
126
127 drm_sched_entity_push_job(&submit->sched_job);
128
129 out_unlock:
130 mutex_unlock(&gpu->sched_lock);
131
132 return ret;
133 }
134
etnaviv_sched_init(struct etnaviv_gpu * gpu)135 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
136 {
137 int ret;
138
139 ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
140 etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
141 msecs_to_jiffies(500), NULL, NULL,
142 dev_name(gpu->dev), gpu->dev);
143 if (ret)
144 return ret;
145
146 return 0;
147 }
148
etnaviv_sched_fini(struct etnaviv_gpu * gpu)149 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
150 {
151 drm_sched_fini(&gpu->sched);
152 }
153