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
14void 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, addr: &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, id) {
26 while (test_and_set_bit(I915_RESET_ENGINE + id,
27 addr: &gt->reset.flags))
28 wait_on_bit(word: &gt->reset.flags, I915_RESET_ENGINE + id,
29 TASK_UNINTERRUPTIBLE);
30 }
31}
32
33void 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, id)
39 clear_and_wake_up_bit(I915_RESET_ENGINE + id, word: &gt->reset.flags);
40
41 clear_bit(I915_RESET_BACKOFF, addr: &gt->reset.flags);
42 wake_up_all(&gt->reset.queue);
43}
44
45bool igt_force_reset(struct intel_gt *gt)
46{
47 intel_gt_set_wedged(gt);
48 intel_gt_reset(gt, stalled_mask: 0, NULL);
49
50 return !intel_gt_is_wedged(gt);
51}
52

source code of linux/drivers/gpu/drm/i915/selftests/igt_reset.c