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 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
etnaviv_sched_free_job(struct drm_sched_job * sched_job)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
etnaviv_sched_push_job(struct etnaviv_gem_submit * submit)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
etnaviv_sched_init(struct etnaviv_gpu * gpu)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
etnaviv_sched_fini(struct etnaviv_gpu * gpu)146 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
147 {
148 drm_sched_fini(&gpu->sched);
149 }
150