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         /* 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->completed_fence != gpu->hangcheck_fence ||
  59             change < 0 || change > 16) {
  60                 gpu->hangcheck_dma_addr = dma_addr;
  61                 gpu->hangcheck_fence = gpu->completed_fence;
  62                 goto out_no_timeout;
  63         }
  64
  65         if(sched_job)
  66                 drm_sched_increase_karma(sched_job);
  67
  68         /* get the GPU back into the init state */
  69         etnaviv_core_dump(submit);
  70         etnaviv_gpu_recover_hang(gpu);
  71
  72         drm_sched_resubmit_jobs(&gpu->sched);
  73
  74         drm_sched_start(&gpu->sched, true);
  75         return DRM_GPU_SCHED_STAT_NOMINAL;
  76
  77 out_no_timeout:
  78         /* restart scheduler after GPU is usable again */
  79         drm_sched_start(&gpu->sched, true);
  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         int ret = 0;
 101
 102         /*
 103          * Hold the fence lock across the whole operation to avoid jobs being
 104          * pushed out of order with regard to their sched fence seqnos as
 105          * allocated in drm_sched_job_arm.
 106          */
 107         mutex_lock(&submit->gpu->fence_lock);
 108
 109         drm_sched_job_arm(&submit->sched_job);
 110
 111         submit->out_fence = dma_fence_get(&submit->sched_job.s_fence->finished);
 112         submit->out_fence_id = idr_alloc_cyclic(&submit->gpu->fence_idr,
 113                                                 submit->out_fence, 0,
 114                                                 INT_MAX, GFP_KERNEL);
 115         if (submit->out_fence_id < 0) {
 116                 drm_sched_job_cleanup(&submit->sched_job);
 117                 ret = -ENOMEM;
 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(&submit->gpu->fence_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,
 137                              etnaviv_hw_jobs_limit, etnaviv_job_hang_limit,
 138                              msecs_to_jiffies(500), NULL, NULL,
 139                              dev_name(gpu->dev), gpu->dev);
 140         if (ret)
 141                 return ret;
 142
 143         return 0;
 144 }
 145
 146 void etnaviv_sched_fini(struct etnaviv_gpu *gpu)
 147 {
 148         drm_sched_fini(&gpu->sched);
 149 }