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(&gpu->sched, 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(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(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(&gpu->sched);
 74
 75	drm_sched_start(&gpu->sched, true);
 76	return DRM_GPU_SCHED_STAT_NOMINAL;
 77
 78out_no_timeout:
 79	/* restart scheduler after GPU is usable again */
 80	drm_sched_start(&gpu->sched, 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(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(&submit->sched_job);
112
113	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
114	ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
115			      submit->out_fence, xa_limit_32b,
116			      &gpu->next_user_fence, GFP_KERNEL);
117	if (ret < 0) {
118		drm_sched_job_cleanup(&submit->sched_job);
119		goto out_unlock;
120	}
121
122	/* the scheduler holds on to the job now */
123	kref_get(&submit->refcount);
124
125	drm_sched_entity_push_job(&submit->sched_job);
126
127out_unlock:
128	mutex_unlock(&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(&gpu->sched, &etnaviv_sched_ops, NULL,
138			     DRM_SCHED_PRIORITY_COUNT,
139			     etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
140			     msecs_to_jiffies(500), NULL, NULL,
141			     dev_name(gpu->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(&gpu->sched);
151}