projects / apple / xnu.git / blame
| Commit | Line | Data |
|---|---|---|
| 5ba3f43e A |
1 | /* |
| 2 | * Copyright (c) 2011-2016 Apple Computer, 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 <arm/cpu_internal.h> | |
| 30 | #include <kern/machine.h> | |
| 31 | #include <kern/cpu_number.h> | |
| 32 | #include <kern/kalloc.h> | |
| 33 | #include <kern/processor.h> | |
| 34 | #include <kperf/kperf.h> | |
| 35 | #include <kperf/kperf_arch.h> | |
| 36 | #include <kperf/kperf_timer.h> | |
| 37 | #include <mach/mach_types.h> | |
| 38 | #include <machine/machine_routines.h> /* xcall */ | |
| 39 | #include <stdatomic.h> | |
| 40 | ||
| 41 | void | |
| 42 | kperf_signal_handler(unsigned int cpu_number) | |
| 43 | { | |
| 44 | uint64_t cpu_mask = UINT64_C(1) << cpu_number; | |
| 45 | ||
| 46 | /* find all the timers that caused a signal */ | |
| 47 | for(int i = 0; i < (int)kperf_timerc; i++) { | |
| 48 | uint64_t pending_cpus; | |
| 49 | struct kperf_timer *timer = &kperf_timerv[i]; | |
| 50 | ||
| 51 | pending_cpus = atomic_fetch_and_explicit(&timer->pending_cpus, | |
| 52 | ~cpu_mask, memory_order_relaxed); | |
| 53 | if (pending_cpus & cpu_mask) { | |
| 54 | kperf_ipi_handler(timer); | |
| 55 | } | |
| 56 | } | |
| 57 | } | |
| 58 | ||
| 59 | bool | |
| 60 | kperf_mp_broadcast_other_running(struct kperf_timer *timer) | |
| 61 | { | |
| 62 | int current_cpu = cpu_number(); | |
| 63 | bool system_only_self = true; | |
| 64 | int n_cpus = machine_info.logical_cpu_max; | |
| 65 | ||
| 66 | /* signal all running processors */ | |
| 67 | for (int i = 0; i < n_cpus; i++) { | |
| 68 | uint64_t i_bit = UINT64_C(1) << i; | |
| 69 | processor_t processor = cpu_to_processor(i); | |
| 70 | ||
| 71 | /* do not IPI processors that are not scheduling threads */ | |
| 72 | if (processor == PROCESSOR_NULL || | |
| 73 | processor->state != PROCESSOR_RUNNING || | |
| 74 | processor->active_thread == THREAD_NULL) | |
| 75 | { | |
| 76 | continue; | |
| 77 | } | |
| 78 | ||
| 79 | if (i == current_cpu) { | |
| 80 | system_only_self = false; | |
| 81 | continue; | |
| 82 | } | |
| 83 | ||
| 84 | /* nor processors that have not responded to the last broadcast */ | |
| 85 | uint64_t already_pending = atomic_fetch_or_explicit( | |
| 86 | &timer->pending_cpus, i_bit, memory_order_relaxed); | |
| 87 | if (already_pending & i_bit) | |
| 88 | { | |
| 89 | #if DEVELOPMENT || DEBUG | |
| 90 | atomic_fetch_add_explicit(&kperf_pending_ipis, 1, | |
| 91 | memory_order_relaxed); | |
| 92 | #endif /* DEVELOPMENT || DEBUG */ | |
| 93 | continue; | |
| 94 | } | |
| 95 | ||
| 96 | cpu_signal(cpu_datap(i), SIGPkptimer, NULL, NULL); | |
| 97 | } | |
| 98 | ||
| 99 | return system_only_self; | |
| 100 | } |