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/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
  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 *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
  33 static 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         /*
  42          * If the GPU managed to complete this jobs fence, the timout is
  43          * spurious. Bail out.
  44          */
  45         if (dma_fence_is_signaled(submit->out_fence))
  46                 goto out_no_timeout;
  47
  48         /*
  49          * If the GPU is still making forward progress on the front-end (which
  50          * should never loop) we shift out the timeout to give it a chance to
  51          * finish the job.
  52          */
  53         dma_addr = gpu_read(gpu, VIVS_FE_DMA_ADDRESS);
  54         change = dma_addr - gpu->hangcheck_dma_addr;
  55         if (gpu->state == ETNA_GPU_STATE_RUNNING &&
  56             (gpu->completed_fence != gpu->hangcheck_fence ||
  57              change < 0 || change > 16)) {
  58                 gpu->hangcheck_dma_addr = dma_addr;
  59                 gpu->hangcheck_fence = gpu->completed_fence;
  60                 goto out_no_timeout;
  61         }
  62
  63         /* block scheduler */
  64         drm_sched_stop(&gpu->sched, sched_job);
  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);
  76         return DRM_GPU_SCHED_STAT_NOMINAL;
  77
  78 out_no_timeout:
  79         list_add(&sched_job->list, &sched_job->sched->pending_list);
  80         return DRM_GPU_SCHED_STAT_NOMINAL;
  81 }
  82
  83 static void etnaviv_sched_free_job(struct drm_sched_job *sched_job)
  84 {
  85         struct etnaviv_gem_submit *submit = to_etnaviv_submit(sched_job);
  86
  87         drm_sched_job_cleanup(sched_job);
  88
  89         etnaviv_submit_put(submit);
  90 }
  91
  92 static const struct drm_sched_backend_ops etnaviv_sched_ops = {
  93         .run_job = etnaviv_sched_run_job,
  94         .timedout_job = etnaviv_sched_timedout_job,
  95         .free_job = etnaviv_sched_free_job,
  96 };
  97
  98 int etnaviv_sched_push_job(struct etnaviv_gem_submit *submit)
  99 {
 100         struct etnaviv_gpu *gpu = submit->gpu;
 101         int ret;
 102
 103         /*
 104          * Hold the sched lock across the whole operation to avoid jobs being
 105          * pushed out of order with regard to their sched fence seqnos as
 106          * allocated in drm_sched_job_arm.
 107          */
 108         mutex_lock(&gpu->sched_lock);
 109
 110         drm_sched_job_arm(&submit->sched_job);
 111
 112         submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
 113         ret = xa_alloc_cyclic(&gpu->user_fences, &submit->out_fence_id,
 114                               submit->out_fence, xa_limit_32b,
 115                               &gpu->next_user_fence, GFP_KERNEL);
 116         if (ret < 0) {
 117                 drm_sched_job_cleanup(&submit->sched_job);
 118                 goto out_unlock;
 119         }
 120
 121         /* the scheduler holds on to the job now */
 122         kref_get(&submit->refcount);
 123
 124         drm_sched_entity_push_job(&submit->sched_job);
 125
 126 out_unlock:
 127         mutex_unlock(&gpu->sched_lock);
 128
 129         return ret;
 130 }
 131
 132 int etnaviv_sched_init(struct etnaviv_gpu *gpu)
 133 {
 134         int ret;
 135
 136         ret = drm_sched_init(&gpu->sched, &etnaviv_sched_ops, NULL,
 137                              DRM_SCHED_PRIORITY_COUNT,
 138                              etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
 139                              msecs_to_jiffies(500), NULL, NULL,
 140                              dev_name(gpu->dev), gpu->dev);
 141         if (ret)
 142                 return ret;
 143
 144         return 0;
 145 }
 146
 147 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
 148 {
 149         drm_sched_fini(&gpu->sched);
 150 }