root/drivers/gpu/drm/i915/selftests/igt_reset.c

DEFINITIONS

1. igt_global_reset_lock
2. igt_global_reset_unlock
3. igt_force_reset

   1 /*
   2  * SPDX-License-Identifier: MIT
   3  *
   4  * Copyright © 2018 Intel Corporation
   5  */
   6 
   7 #include "igt_reset.h"
   8 
   9 #include "gt/intel_engine.h"
  10 #include "gt/intel_gt.h"
  11 
  12 #include "../i915_drv.h"
  13 
  14 void igt_global_reset_lock(struct intel_gt *gt)
  15 {
  16         struct intel_engine_cs *engine;
  17         enum intel_engine_id id;
  18 
  19         pr_debug("%s: current gpu_error=%08lx\n", __func__, gt->reset.flags);
  20 
  21         while (test_and_set_bit(I915_RESET_BACKOFF, &gt->reset.flags))
  22                 wait_event(gt->reset.queue,
  23                            !test_bit(I915_RESET_BACKOFF, &gt->reset.flags));
  24 
  25         for_each_engine(engine, gt->i915, id) {
  26                 while (test_and_set_bit(I915_RESET_ENGINE + id,
  27                                         &gt->reset.flags))
  28                         wait_on_bit(&gt->reset.flags, I915_RESET_ENGINE + id,
  29                                     TASK_UNINTERRUPTIBLE);
  30         }
  31 }
  32 
  33 void igt_global_reset_unlock(struct intel_gt *gt)
  34 {
  35         struct intel_engine_cs *engine;
  36         enum intel_engine_id id;
  37 
  38         for_each_engine(engine, gt->i915, id)
  39                 clear_bit(I915_RESET_ENGINE + id, &gt->reset.flags);
  40 
  41         clear_bit(I915_RESET_BACKOFF, &gt->reset.flags);
  42         wake_up_all(&gt->reset.queue);
  43 }
  44 
  45 bool igt_force_reset(struct intel_gt *gt)
  46 {
  47         intel_gt_set_wedged(gt);
  48         intel_gt_reset(gt, 0, NULL);
  49 
  50         return !intel_gt_is_wedged(gt);
  51 }