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 *
21etnaviv_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
72static 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
85static 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 (gpu->completed_fence != gpu->hangcheck_fence ||
110	    change < 0 || change > 16) {
111		gpu->hangcheck_dma_addr = dma_addr;
112		gpu->hangcheck_fence = gpu->completed_fence;
113		goto out_no_timeout;
114	}
115
116	if(sched_job)
117		drm_sched_increase_karma(sched_job);
118
119	/* get the GPU back into the init state */
120	etnaviv_core_dump(submit);
121	etnaviv_gpu_recover_hang(gpu);
122
123	drm_sched_resubmit_jobs(&gpu->sched);
124
125out_no_timeout:
126	/* restart scheduler after GPU is usable again */
127	drm_sched_start(&gpu->sched, true);
128}
129
130static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
131{
132	struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
133
134	drm_sched_job_cleanup(sched_job);
135
136	etnaviv_submit_put(submit);
137}
138
139static const struct drm_sched_backend_ops etnaviv_sched_ops = {
140	.dependency = etnaviv_sched_dependency,
141	.run_job = etnaviv_sched_run_job,
142	.timedout_job = etnaviv_sched_timedout_job,
143	.free_job = etnaviv_sched_free_job,
144};
145
146int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
147			   struct etnaviv_gem_submit *submit)
148{
149	int ret = 0;
150
151	/*
152	 * Hold the fence lock across the whole operation to avoid jobs being
153	 * pushed out of order with regard to their sched fence seqnos as
154	 * allocated in drm_sched_job_init.
155	 */
156	mutex_lock(&submit->gpu->fence_lock);
157
158	ret = drm_sched_job_init(&submit->sched_job, sched_entity,
159				 submit->ctx);
160	if (ret)
161		goto out_unlock;
162
163	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
164	submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
165						submit->out_fence, 0,
166						INT_MAX, GFP_KERNEL);
167	if (submit->out_fence_id < 0) {
168		drm_sched_job_cleanup(&submit->sched_job);
169		ret = -ENOMEM;
170		goto out_unlock;
171	}
172
173	/* the scheduler holds on to the job now */
174	kref_get(&submit->refcount);
175
176	drm_sched_entity_push_job(&submit->sched_job, sched_entity);
177
178out_unlock:
179	mutex_unlock(&submit->gpu->fence_lock);
180
181	return ret;
182}
183
184int etnaviv_sched_init(struct etnaviv_gpu *gpu)
185{
186	int ret;
187
188	ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
189			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
190			     msecs_to_jiffies(500), dev_name(gpu->dev));
191	if (ret)
192		return ret;
193
194	return 0;
195}
196
197void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
198{
199	drm_sched_fini(&gpu->sched);
200}
201