Home | History | Annotate | Line # | Download | only in selftests 
      1 /*	$NetBSD: igt_reset.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $	*/
      2 
      3 /*
      4  * SPDX-License-Identifier: MIT
      5  *
      6  * Copyright  2018 Intel Corporation
      7  */
      8 
      9 #include <sys/cdefs.h>
     10 __KERNEL_RCSID(0, "$NetBSD: igt_reset.c,v 1.2 2021/12/18 23:45:31 riastradh Exp $");
     11 
     12 #include "igt_reset.h"
     13 
     14 #include "gt/intel_engine.h"
     15 #include "gt/intel_gt.h"
     16 
     17 #include "../i915_drv.h"
     18 
     19 void igt_global_reset_lock(struct intel_gt *gt)
     20 {
     21 	struct intel_engine_cs *engine;
     22 	enum intel_engine_id id;
     23 
     24 	pr_debug("%s: current gpu_error=%08lx\n", __func__, gt->reset.flags);
     25 
     26 	while (test_and_set_bit(I915_RESET_BACKOFF, &gt->reset.flags))
     27 		wait_event(gt->reset.queue,
     28 			   !test_bit(I915_RESET_BACKOFF, &gt->reset.flags));
     29 
     30 	for_each_engine(engine, gt, id) {
     31 		while (test_and_set_bit(I915_RESET_ENGINE + id,
     32 					&gt->reset.flags))
     33 			wait_on_bit(&gt->reset.flags, I915_RESET_ENGINE + id,
     34 				    TASK_UNINTERRUPTIBLE);
     35 	}
     36 }
     37 
     38 void igt_global_reset_unlock(struct intel_gt *gt)
     39 {
     40 	struct intel_engine_cs *engine;
     41 	enum intel_engine_id id;
     42 
     43 	for_each_engine(engine, gt, id)
     44 		clear_bit(I915_RESET_ENGINE + id, &gt->reset.flags);
     45 
     46 	clear_bit(I915_RESET_BACKOFF, &gt->reset.flags);
     47 	wake_up_all(&gt->reset.queue);
     48 }
     49 
     50 bool igt_force_reset(struct intel_gt *gt)
     51 {
     52 	intel_gt_set_wedged(gt);
     53 	intel_gt_reset(gt, 0, NULL);
     54 
     55 	return !intel_gt_is_wedged(gt);
     56 }
     57