drivers/gpu/drm/etnaviv/etnaviv_sched.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (C) 2017 Etnaviv Project
   4  */
   5
   6 #include <linux/kthread.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
  15 static int etnaviv_job_hang_limit = 0;
  16 module_param_named(job_hang_limit, etnaviv_job_hang_limit, int , 0444);
  17 static int etnaviv_hw_jobs_limit = 4;
  18 module_param_named(hw_job_limit, etnaviv_hw_jobs_limit, int , 0444);
  19
  20 static struct dma_fence *
  21 etnaviv_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
  72 static 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
  85 static 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         /*
  93          * If the GPU managed to complete this jobs fence, the timout is
  94          * spurious. Bail out.
  95          */
  96         if (fence_completed(gpu, submit->out_fence->seqno))
  97                 return;
  98
  99         /*
 100          * If the GPU is still making forward progress on the front-end (which
 101          * should never loop) we shift out the timeout to give it a chance to
 102          * finish the job.
 103          */
 104         dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
 105         change = dma_addr - gpu->hangcheck_dma_addr;
 106         if (change < 0 || change > 16) {
 107                 gpu->hangcheck_dma_addr = dma_addr;
 108                 schedule_delayed_work(&sched_job->work_tdr,
 109                                       sched_job->sched->timeout);
 110                 return;
 111         }
 112
 113         /* block scheduler */
 114         kthread_park(gpu->sched.thread);
 115         drm_sched_hw_job_reset(&gpu->sched, sched_job);
 116
 117         /* get the GPU back into the init state */
 118         etnaviv_core_dump(gpu);
 119         etnaviv_gpu_recover_hang(gpu);
 120
 121         /* restart scheduler after GPU is usable again */
 122         drm_sched_job_recovery(&gpu->sched);
 123         kthread_unpark(gpu->sched.thread);
 124 }
 125
 126 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
 127 {
 128         struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
 129
 130         etnaviv_submit_put(submit);
 131 }
 132
 133 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
 134         .dependency = etnaviv_sched_dependency,
 135         .run_job = etnaviv_sched_run_job,
 136         .timedout_job = etnaviv_sched_timedout_job,
 137         .free_job = etnaviv_sched_free_job,
 138 };
 139
 140 int etnaviv_sched_push_job(struct drm_sched_entity *sched_entity,
 141                            struct etnaviv_gem_submit *submit)
 142 {
 143         int ret = 0;
 144
 145         /*
 146          * Hold the fence lock across the whole operation to avoid jobs being
 147          * pushed out of order with regard to their sched fence seqnos as
 148          * allocated in drm_sched_job_init.
 149          */
 150         mutex_lock(&submit->gpu->fence_lock);
 151
 152         ret = drm_sched_job_init(&submit->sched_job, sched_entity,
 153                                  submit->cmdbuf.ctx);
 154         if (ret)
 155                 goto out_unlock;
 156
 157         submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
 158         submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
 159                                                 submit->out_fence, 0,
 160                                                 INT_MAX, GFP_KERNEL);
 161         if (submit->out_fence_id < 0) {
 162                 ret = -ENOMEM;
 163                 goto out_unlock;
 164         }
 165
 166         /* the scheduler holds on to the job now */
 167         kref_get(&submit->refcount);
 168
 169         drm_sched_entity_push_job(&submit->sched_job, sched_entity);
 170
 171 out_unlock:
 172         mutex_unlock(&submit->gpu->fence_lock);
 173
 174         return ret;
 175 }
 176
 177 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
 178 {
 179         int ret;
 180
 181         ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops,
 182                              etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
 183                              msecs_to_jiffies(500), dev_name(gpu->dev));
 184         if (ret)
 185                 return ret;
 186
 187         return 0;
 188 }
 189
 190 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
 191 {
 192         drm_sched_fini(&gpu->sched);
 193 }