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
15static int etnaviv_job_hang_limit = 0;
16module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444);
17static int etnaviv_hw_jobs_limit = 4;
18module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444);
19
20static 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
33static 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 /* block scheduler */
42 drm_sched_stop(sched: &gpu->sched, bad: sched_job);
43
44 /*
45 * If the GPU managed to complete this jobs fence, the timout is
46 * spurious. Bail out.
47 */
48 if (dma_fence_is_signaled(fence: submit->out_fence))
49 goto out_no_timeout;
50
51 /*
52 * If the GPU is still making forward progress on the front-end (which
53 * should never loop) we shift out the timeout to give it a chance to
54 * finish the job.
55 */
56 dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
57 change = dma_addr - gpu->hangcheck_dma_addr;
58 if (gpu->state == ETNA_GPU_STATE_RUNNING &&
59 (gpu->completed_fence != gpu->hangcheck_fence ||
60 change < 0 || change > 16)) {
61 gpu->hangcheck_dma_addr = dma_addr;
62 gpu->hangcheck_fence = gpu->completed_fence;
63 goto out_no_timeout;
64 }
65
66 if(sched_job)
67 drm_sched_increase_karma(bad: 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(sched: &gpu->sched);
74
75 drm_sched_start(sched: &gpu->sched, full_recovery: true);
76 return DRM_GPU_SCHED_STAT_NOMINAL;
77
78out_no_timeout:
79 /* restart scheduler after GPU is usable again */
80 drm_sched_start(sched: &gpu->sched, full_recovery: true);
81 return DRM_GPU_SCHED_STAT_NOMINAL;
82}
83
84static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
85{
86 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
87
88 drm_sched_job_cleanup(job: sched_job);
89
90 etnaviv_submit_put(submit);
91}
92
93static const struct drm_sched_backend_ops etnaviv_sched_ops = {
94 .run_job = etnaviv_sched_run_job,
95 .timedout_job = etnaviv_sched_timedout_job,
96 .free_job = etnaviv_sched_free_job,
97};
98
99int etnaviv_sched_push_job(struct etnaviv_gem_submit *submit)
100{
101 struct etnaviv_gpu *gpu = submit->gpu;
102 int ret;
103
104 /*
105 * Hold the sched lock across the whole operation to avoid jobs being
106 * pushed out of order with regard to their sched fence seqnos as
107 * allocated in drm_sched_job_arm.
108 */
109 mutex_lock(&gpu->sched_lock);
110
111 drm_sched_job_arm(job: &submit->sched_job);
112
113 submit->out_fence = dma_fence_get(fence: &submit->sched_job.s_fence->finished);
114 ret = xa_alloc_cyclic(xa: &gpu->user_fences, id: &submit->out_fence_id,
115 entry: submit->out_fence, xa_limit_32b,
116 next: &gpu->next_user_fence, GFP_KERNEL);
117 if (ret < 0) {
118 drm_sched_job_cleanup(job: &submit->sched_job);
119 goto out_unlock;
120 }
121
122 /* the scheduler holds on to the job now */
123 kref_get(kref: &submit->refcount);
124
125 drm_sched_entity_push_job(sched_job: &submit->sched_job);
126
127out_unlock:
128 mutex_unlock(lock: &gpu->sched_lock);
129
130 return ret;
131}
132
133int etnaviv_sched_init(struct etnaviv_gpu *gpu)
134{
135 int ret;
136
137 ret = drm_sched_init(sched: &gpu->sched, ops: &etnaviv_sched_ops,
138 num_rqs: DRM_SCHED_PRIORITY_COUNT,
139 hw_submission: etnaviv_hw_jobs_limit, hang_limit: etnaviv_job_hang_limit,
140 timeout: msecs_to_jiffies(m: 500), NULL, NULL,
141 name: dev_name(dev: gpu->dev), dev: gpu->dev);
142 if (ret)
143 return ret;
144
145 return 0;
146}
147
148void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
149{
150 drm_sched_fini(sched: &gpu->sched);
151}
152

source code of linux/drivers/gpu/drm/etnaviv/etnaviv_sched.c