1 | /* |
2 | * Copyright (c) 2020-2023 Apple Inc. All rights reserved. |
3 | * |
4 | * @APPLE_OSREFERENCE_LICENSE_HEADER_START@ |
5 | * |
6 | * This file contains Original Code and/or Modifications of Original Code |
7 | * as defined in and that are subject to the Apple Public Source License |
8 | * Version 2.0 (the 'License'). You may not use this file except in |
9 | * compliance with the License. The rights granted to you under the License |
10 | * may not be used to create, or enable the creation or redistribution of, |
11 | * unlawful or unlicensed copies of an Apple operating system, or to |
12 | * circumvent, violate, or enable the circumvention or violation of, any |
13 | * terms of an Apple operating system software license agreement. |
14 | * |
15 | * Please obtain a copy of the License at |
16 | * http://www.opensource.apple.com/apsl/ and read it before using this file. |
17 | * |
18 | * The Original Code and all software distributed under the License are |
19 | * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER |
20 | * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES, |
21 | * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY, |
22 | * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT. |
23 | * Please see the License for the specific language governing rights and |
24 | * limitations under the License. |
25 | * |
26 | * @APPLE_OSREFERENCE_LICENSE_HEADER_END@ |
27 | */ |
28 | |
29 | #include <kern/percpu.h> |
30 | #include <stdatomic.h> |
31 | #include <stdbool.h> |
32 | #include <stdint.h> |
33 | |
34 | #pragma once |
35 | |
36 | #if CONFIG_SPTM |
37 | /* |
38 | * This header is only meant for the PPL and SPTM to access the preemption disable data structure directly. |
39 | */ |
40 | #endif /* CONFIG_SPTM */ |
41 | |
42 | /** |
43 | * Track time and other counters during a preemption disabled window, |
44 | * when `SCHED_HYGIENE` is configured. |
45 | */ |
46 | struct _preemption_disable_pcpu { |
47 | /** |
48 | * A snapshot of times and counters relevant to preemption disable measurement. |
49 | */ |
50 | struct _preemption_disable_snap { |
51 | /* The time when preemption was disabled, in Mach time units. */ |
52 | uint64_t pds_mach_time; |
53 | /* The amount of time spent in interrupts by the current CPU, in Mach time units. */ |
54 | uint64_t pds_int_mach_time; |
55 | #if CONFIG_CPU_COUNTERS |
56 | /* The number of cycles elapsed on this CPU. */ |
57 | uint64_t pds_cycles; |
58 | /* The number of instructions seen by this CPU. */ |
59 | uint64_t pds_instrs; |
60 | #endif /* CONFIG_CPU_COUNTERS */ |
61 | } |
62 | /* At the start of the preemption disabled window. */ |
63 | pdp_start; |
64 | |
65 | /* The maximum duration seen by this CPU, in Mach time units. */ |
66 | _Atomic uint64_t pdp_max_mach_duration; |
67 | /* |
68 | * Whether to abandon the measurement on this CPU, |
69 | * due to a call to abandon_preemption_disable_measurement(). |
70 | */ |
71 | bool pdp_abandon; |
72 | }; |
73 | |
74 | PERCPU_DECL(struct _preemption_disable_pcpu, _preemption_disable_pcpu_data); |
75 | |