1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * Copyright (C) 2017 Etnaviv Project
4 */
5
6 #include <linux/kthread.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_dependency(struct drm_sched_job * sched_job,struct drm_sched_entity * entity)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 if (bo->excl) {
43 fence = bo->excl;
44 bo->excl = NULL;
45
46 if (!dma_fence_is_signaled(fence))
47 return fence;
48
49 dma_fence_put(fence);
50 }
51
52 for (j = 0; j < bo->nr_shared; j++) {
53 if (!bo->shared[j])
54 continue;
55
56 fence = bo->shared[j];
57 bo->shared[j] = NULL;
58
59 if (!dma_fence_is_signaled(fence))
60 return fence;
61
62 dma_fence_put(fence);
63 }
64 kfree(bo->shared);
65 bo->nr_shared = 0;
66 bo->shared = NULL;
67 }
68
69 return NULL;
70 }
71
etnaviv_sched_run_job(struct drm_sched_job * sched_job)72 static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job)
73 {
74 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
75 struct dma_fence *fence = NULL;
76
77 if (likely(!sched_job->s_fence->finished.error))
78 fence = etnaviv_gpu_submit(submit);
79 else
80 dev_dbg(submit->gpu->dev, "skipping bad job\n");
81
82 return fence;
83 }
84
etnaviv_sched_timedout_job(struct drm_sched_job * sched_job)85 static void etnaviv_sched_timedout_job(struct drm_sched_job *sched_job)
86 {
87 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
88 struct etnaviv_gpu *gpu = submit->gpu;
89 u32 dma_addr;
90 int change;
91
92 /*
93 * If the GPU managed to complete this jobs fence, the timout is
94 * spurious. Bail out.
95 */
96 if (fence_completed(gpu, submit->out_fence->seqno))
97 return;
98
99 /*
100 * If the GPU is still making forward progress on the front-end (which
101 * should never loop) we shift out the timeout to give it a chance to
102 * finish the job.
103 */
104 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
105 change = dma_addr - gpu->hangcheck_dma_addr;
106 if (change < 0 || change > 16) {
107 gpu->hangcheck_dma_addr = dma_addr;
108 schedule_delayed_work(&sched_job->work_tdr,
109 sched_job->sched->timeout);
110 return;
111 }
112
113 /* block scheduler */
114 kthread_park(gpu->sched.thread);
115 drm_sched_hw_job_reset(&gpu->sched, sched_job);
116
117 /* get the GPU back into the init state */
118 etnaviv_core_dump(gpu);
119 etnaviv_gpu_recover_hang(gpu);
120
121 /* restart scheduler after GPU is usable again */
122 drm_sched_job_recovery(&gpu->sched);
123 kthread_unpark(gpu->sched.thread);
124 }
125
etnaviv_sched_free_job(struct drm_sched_job * sched_job)126 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
127 {
128 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
129
130 etnaviv_submit_put(submit);
131 }
132
133 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
134 .dependency = etnaviv_sched_dependency,
135 .run_job = etnaviv_sched_run_job,
136 .timedout_job = etnaviv_sched_timedout_job,
137 .free_job = etnaviv_sched_free_job,
138 };
139
etnaviv_sched_push_job(struct drm_sched_entity * sched_entity,struct etnaviv_gem_submit * submit)140 int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
141 struct etnaviv_gem_submit *submit)
142 {
143 int ret = 0;
144
145 /*
146 * Hold the fence lock across the whole operation to avoid jobs being
147 * pushed out of order with regard to their sched fence seqnos as
148 * allocated in drm_sched_job_init.
149 */
150 mutex_lock(&submit->gpu->fence_lock);
151
152 ret = drm_sched_job_init(&submit->sched_job, sched_entity,
153 submit->cmdbuf.ctx);
154 if (ret)
155 goto out_unlock;
156
157 submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
158 submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
159 submit->out_fence, 0,
160 INT_MAX, GFP_KERNEL);
161 if (submit->out_fence_id < 0) {
162 ret = -ENOMEM;
163 goto out_unlock;
164 }
165
166 /* the scheduler holds on to the job now */
167 kref_get(&submit->refcount);
168
169 drm_sched_entity_push_job(&submit->sched_job, sched_entity);
170
171 out_unlock:
172 mutex_unlock(&submit->gpu->fence_lock);
173
174 return ret;
175 }
176
etnaviv_sched_init(struct etnaviv_gpu * gpu)177 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
178 {
179 int ret;
180
181 ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
182 etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
183 msecs_to_jiffies(500), dev_name(gpu->dev));
184 if (ret)
185 return ret;
186
187 return 0;
188 }
189
etnaviv_sched_fini(struct etnaviv_gpu * gpu)190 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
191 {
192 drm_sched_fini(&gpu->sched);
193 }
194
