1// SPDX-License-Identifier: MIT
2/*
3 * Copyright © 2021 Intel Corporation
4 */
5
6#include <linux/jiffies.h>
7
8//#include "gt/intel_engine_user.h"
9#include "gt/intel_gt.h"
10#include "i915_drv.h"
11#include "i915_selftest.h"
12
13#include "selftests/intel_scheduler_helpers.h"
14
15#define REDUCED_TIMESLICE 5
16#define REDUCED_PREEMPT 10
17#define WAIT_FOR_RESET_TIME_MS 10000
18
19struct intel_engine_cs *intel_selftest_find_any_engine(struct intel_gt *gt)
20{
21 struct intel_engine_cs *engine;
22 enum intel_engine_id id;
23
24 for_each_engine(engine, gt, id)
25 return engine;
26
27 pr_err("No valid engine found!\n");
28 return NULL;
29}
30
31int intel_selftest_modify_policy(struct intel_engine_cs *engine,
32 struct intel_selftest_saved_policy *saved,
33 enum selftest_scheduler_modify modify_type)
34{
35 int err;
36
37 saved->reset = engine->i915->params.reset;
38 saved->flags = engine->flags;
39 saved->timeslice = engine->props.timeslice_duration_ms;
40 saved->preempt_timeout = engine->props.preempt_timeout_ms;
41
42 switch (modify_type) {
43 case SELFTEST_SCHEDULER_MODIFY_FAST_RESET:
44 /*
45 * Enable force pre-emption on time slice expiration
46 * together with engine reset on pre-emption timeout.
47 * This is required to make the GuC notice and reset
48 * the single hanging context.
49 * Also, reduce the preemption timeout to something
50 * small to speed the test up.
51 */
52 engine->i915->params.reset = 2;
53 engine->flags |= I915_ENGINE_WANT_FORCED_PREEMPTION;
54 engine->props.timeslice_duration_ms = REDUCED_TIMESLICE;
55 engine->props.preempt_timeout_ms = REDUCED_PREEMPT;
56 break;
57
58 case SELFTEST_SCHEDULER_MODIFY_NO_HANGCHECK:
59 engine->props.preempt_timeout_ms = 0;
60 break;
61
62 default:
63 pr_err("Invalid scheduler policy modification type: %d!\n", modify_type);
64 return -EINVAL;
65 }
66
67 if (!intel_engine_uses_guc(engine))
68 return 0;
69
70 err = intel_guc_global_policies_update(guc: &engine->gt->uc.guc);
71 if (err)
72 intel_selftest_restore_policy(engine, saved);
73
74 return err;
75}
76
77int intel_selftest_restore_policy(struct intel_engine_cs *engine,
78 struct intel_selftest_saved_policy *saved)
79{
80 /* Restore the original policies */
81 engine->i915->params.reset = saved->reset;
82 engine->flags = saved->flags;
83 engine->props.timeslice_duration_ms = saved->timeslice;
84 engine->props.preempt_timeout_ms = saved->preempt_timeout;
85
86 if (!intel_engine_uses_guc(engine))
87 return 0;
88
89 return intel_guc_global_policies_update(guc: &engine->gt->uc.guc);
90}
91
92int intel_selftest_wait_for_rq(struct i915_request *rq)
93{
94 long ret;
95
96 ret = i915_request_wait(rq, flags: 0, timeout: msecs_to_jiffies(WAIT_FOR_RESET_TIME_MS));
97 if (ret < 0)
98 return ret;
99
100 return 0;
101}
102

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