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, 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, id)
39 		clear_and_wake_up_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 }
52