Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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#include "state_hi.xml.h"
15
16static int etnaviv_job_hang_limit = 0;
17module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444);
18static int etnaviv_hw_jobs_limit = 4;
19module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444);
20
21static struct dma_fence *etnaviv_sched_run_job(struct drm_sched_job *sched_job)
22{
23 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
24 struct dma_fence *fence = NULL;
25
26 if (likely(!sched_job->s_fence->finished.error))
27 fence = etnaviv_gpu_submit(submit);
28 else
29 dev_dbg(submit->gpu->dev, "skipping bad job\n");
30
31 return fence;
32}
33
34static enum drm_gpu_sched_stat etnaviv_sched_timedout_job(struct drm_sched_job
35 *sched_job)
36{
37 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
38 struct etnaviv_gpu *gpu = submit->gpu;
39 u32 dma_addr, primid = 0;
40 int change;
41
42 /*
43 * If the GPU managed to complete this jobs fence, the timeout has
44 * fired before free-job worker. The timeout is spurious, so bail out.
45 */
46 if (dma_fence_is_signaled(submit->out_fence))
47 return DRM_GPU_SCHED_STAT_NO_HANG;
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 (submit->exec_state == ETNA_PIPE_3D) {
57 /* guard against concurrent usage from perfmon_sample */
58 mutex_lock(&gpu->lock);
59 gpu_write(gpu, VIVS_MC_PROFILE_CONFIG0,
60 VIVS_MC_PROFILE_CONFIG0_FE_CURRENT_PRIM <<
61 VIVS_MC_PROFILE_CONFIG0_FE__SHIFT);
62 primid = gpu_read(gpu, VIVS_MC_PROFILE_FE_READ);
63 mutex_unlock(&gpu->lock);
64 }
65 if (gpu->state == ETNA_GPU_STATE_RUNNING &&
66 (gpu->completed_fence != gpu->hangcheck_fence ||
67 change < 0 || change > 16 ||
68 (submit->exec_state == ETNA_PIPE_3D &&
69 gpu->hangcheck_primid != primid))) {
70 gpu->hangcheck_dma_addr = dma_addr;
71 gpu->hangcheck_primid = primid;
72 gpu->hangcheck_fence = gpu->completed_fence;
73 return DRM_GPU_SCHED_STAT_NO_HANG;
74 }
75
76 /* block scheduler */
77 drm_sched_stop(&gpu->sched, sched_job);
78
79 if(sched_job)
80 drm_sched_increase_karma(sched_job);
81
82 /* get the GPU back into the init state */
83 etnaviv_core_dump(submit);
84 etnaviv_gpu_recover_hang(submit);
85
86 drm_sched_resubmit_jobs(&gpu->sched);
87
88 drm_sched_start(&gpu->sched, 0);
89 return DRM_GPU_SCHED_STAT_RESET;
90}
91
92static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
93{
94 struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
95
96 drm_sched_job_cleanup(sched_job);
97
98 etnaviv_submit_put(submit);
99}
100
101static const struct drm_sched_backend_ops etnaviv_sched_ops = {
102 .run_job = etnaviv_sched_run_job,
103 .timedout_job = etnaviv_sched_timedout_job,
104 .free_job = etnaviv_sched_free_job,
105};
106
107int etnaviv_sched_push_job(struct etnaviv_gem_submit *submit)
108{
109 struct etnaviv_gpu *gpu = submit->gpu;
110 int ret;
111
112 /*
113 * Hold the sched lock across the whole operation to avoid jobs being
114 * pushed out of order with regard to their sched fence seqnos as
115 * allocated in drm_sched_job_arm.
116 */
117 mutex_lock(&gpu->sched_lock);
118
119 ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
120 NULL, xa_limit_32b, &gpu->next_user_fence,
121 GFP_KERNEL);
122 if (ret < 0)
123 goto out_unlock;
124
125 drm_sched_job_arm(&submit->sched_job);
126
127 submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
128
129 xa_store(&gpu->user_fences, submit->out_fence_id,
130 submit->out_fence, GFP_KERNEL);
131
132 /* the scheduler holds on to the job now */
133 kref_get(&submit->refcount);
134
135 drm_sched_entity_push_job(&submit->sched_job);
136
137out_unlock:
138 mutex_unlock(&gpu->sched_lock);
139
140 return ret;
141}
142
143int etnaviv_sched_init(struct etnaviv_gpu *gpu)
144{
145 const struct drm_sched_init_args args = {
146 .ops = &etnaviv_sched_ops,
147 .num_rqs = DRM_SCHED_PRIORITY_COUNT,
148 .credit_limit = etnaviv_hw_jobs_limit,
149 .hang_limit = etnaviv_job_hang_limit,
150 .timeout = msecs_to_jiffies(500),
151 .name = dev_name(gpu->dev),
152 .dev = gpu->dev,
153 };
154
155 return drm_sched_init(&gpu->sched, &args);
156}
157
158void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
159{
160 drm_sched_fini(&gpu->sched);
161}