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_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 /* block scheduler */
93 drm_sched_stop(&gpu->sched, sched_job);
94
95 /*
96 * If the GPU managed to complete this jobs fence, the timout is
97 * spurious. Bail out.
98 */
99 if (dma_fence_is_signaled(submit->out_fence))
100 goto out_no_timeout;
101
102 /*
103 * If the GPU is still making forward progress on the front-end (which
104 * should never loop) we shift out the timeout to give it a chance to
105 * finish the job.
106 */
107 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
108 change = dma_addr - gpu->hangcheck_dma_addr;
109 if (change < 0 || change > 16) {
110 gpu->hangcheck_dma_addr = dma_addr;
111 goto out_no_timeout;
112 }
113
114 if(sched_job)
115 drm_sched_increase_karma(sched_job);
116
117 /* get the GPU back into the init state */
118 etnaviv_core_dump(submit);
119 etnaviv_gpu_recover_hang(gpu);
120
121 drm_sched_resubmit_jobs(&gpu->sched);
122
123 out_no_timeout:
124 /* restart scheduler after GPU is usable again */
125 drm_sched_start(&gpu->sched, true);
126 }
127
etnaviv_sched_free_job(struct drm_sched_job * sched_job)128 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
129 {
130 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
131
132 drm_sched_job_cleanup(sched_job);
133
134 etnaviv_submit_put(submit);
135 }
136
137 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
138 .dependency = etnaviv_sched_dependency,
139 .run_job = etnaviv_sched_run_job,
140 .timedout_job = etnaviv_sched_timedout_job,
141 .free_job = etnaviv_sched_free_job,
142 };
143
etnaviv_sched_push_job(struct drm_sched_entity * sched_entity,struct etnaviv_gem_submit * submit)144 int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
145 struct etnaviv_gem_submit *submit)
146 {
147 int ret = 0;
148
149 /*
150 * Hold the fence lock across the whole operation to avoid jobs being
151 * pushed out of order with regard to their sched fence seqnos as
152 * allocated in drm_sched_job_init.
153 */
154 mutex_lock(&submit->gpu->fence_lock);
155
156 ret = drm_sched_job_init(&submit->sched_job, sched_entity,
157 submit->ctx);
158 if (ret)
159 goto out_unlock;
160
161 submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
162 submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
163 submit->out_fence, 0,
164 INT_MAX, GFP_KERNEL);
165 if (submit->out_fence_id < 0) {
166 drm_sched_job_cleanup(&submit->sched_job);
167 ret = -ENOMEM;
168 goto out_unlock;
169 }
170
171 /* the scheduler holds on to the job now */
172 kref_get(&submit->refcount);
173
174 drm_sched_entity_push_job(&submit->sched_job, sched_entity);
175
176 out_unlock:
177 mutex_unlock(&submit->gpu->fence_lock);
178
179 return ret;
180 }
181
etnaviv_sched_init(struct etnaviv_gpu * gpu)182 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
183 {
184 int ret;
185
186 ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
187 etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
188 msecs_to_jiffies(500), dev_name(gpu->dev));
189 if (ret)
190 return ret;
191
192 return 0;
193 }
194
etnaviv_sched_fini(struct etnaviv_gpu * gpu)195 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
196 {
197 drm_sched_fini(&gpu->sched);
198 }
199
