etnaviv_sched.c

  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	drm_sched_job_arm(&submit->sched_job);
120
121	submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
122	ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
123			      submit->out_fence, xa_limit_32b,
124			      &gpu->next_user_fence, GFP_KERNEL);
125	if (ret < 0) {
126		drm_sched_job_cleanup(&submit->sched_job);
127		goto out_unlock;
128	}
129
130	/* the scheduler holds on to the job now */
131	kref_get(&submit->refcount);
132
133	drm_sched_entity_push_job(&submit->sched_job);
134
135out_unlock:
136	mutex_unlock(&gpu->sched_lock);
137
138	return ret;
139}
140
141int etnaviv_sched_init(struct etnaviv_gpu *gpu)
142{
143	const struct drm_sched_init_args args = {
144		.ops = &etnaviv_sched_ops,
145		.num_rqs = DRM_SCHED_PRIORITY_COUNT,
146		.credit_limit = etnaviv_hw_jobs_limit,
147		.hang_limit = etnaviv_job_hang_limit,
148		.timeout = msecs_to_jiffies(500),
149		.name = dev_name(gpu->dev),
150		.dev = gpu->dev,
151	};
152
153	return drm_sched_init(&gpu->sched, &args);
154}
155
156void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
157{
158	drm_sched_fini(&gpu->sched);
159}