| | 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 <i386/mp.h> |
| | 30 | #include <mach/mach_types.h> |
| | 31 | #include <kern/processor.h> |
| | 32 | #include <kperf/buffer.h> |
| | 33 | #include <kperf/kperf.h> |
| | 34 | #include <kperf/kperf_arch.h> |
| | 35 | #include <kperf/kperf_timer.h> |
| | 36 | #include <stdatomic.h> |
| | 37 | |
| | 38 | bool |
| | 39 | kperf_mp_broadcast_other_running(struct kperf_timer *trigger) |
| | 40 | { |
| | 41 | int current_cpu = cpu_number(); |
| | 42 | int ncpus = machine_info.logical_cpu_max; |
| | 43 | bool system_only_self = true; |
| | 44 | cpumask_t cpu_mask = 0; |
| | 45 | |
| | 46 | for (int i = 0; i < ncpus; i++) { |
| | 47 | uint64_t i_bit = UINT64_C(1) << i; |
| | 48 | processor_t processor = cpu_to_processor(i); |
| | 49 | |
| | 50 | /* do not IPI processors that are not scheduling threads */ |
| | 51 | if (processor == PROCESSOR_NULL || |
| | 52 | processor->state != PROCESSOR_RUNNING || |
| | 53 | processor->active_thread == THREAD_NULL) { |
| | 54 | #if DEVELOPMENT || DEBUG |
| | 55 | BUF_VERB(PERF_TM_SKIPPED, i, |
| | 56 | processor != PROCESSOR_NULL ? processor->state : 0, |
| | 57 | processor != PROCESSOR_NULL ? processor->active_thread : 0); |
| | 58 | #endif /* DEVELOPMENT || DEBUG */ |
| | 59 | continue; |
| | 60 | } |
| | 61 | |
| | 62 | /* don't run the handler on the current processor */ |
| | 63 | if (i == current_cpu) { |
| | 64 | system_only_self = false; |
| | 65 | continue; |
| | 66 | } |
| | 67 | |
| | 68 | /* nor processors that have not responded to the last IPI */ |
| | 69 | uint64_t already_pending = atomic_fetch_or_explicit( |
| | 70 | &trigger->pending_cpus, i_bit, |
| | 71 | memory_order_relaxed); |
| | 72 | if (already_pending & i_bit) { |
| | 73 | #if DEVELOPMENT || DEBUG |
| | 74 | BUF_VERB(PERF_TM_PENDING, i_bit, already_pending); |
| | 75 | atomic_fetch_add_explicit(&kperf_pending_ipis, 1, |
| | 76 | memory_order_relaxed); |
| | 77 | #endif /* DEVELOPMENT || DEBUG */ |
| | 78 | continue; |
| | 79 | } |
| | 80 | |
| | 81 | cpu_mask |= cpu_to_cpumask(i); |
| | 82 | } |
| | 83 | |
| | 84 | if (cpu_mask != 0) { |
| | 85 | mp_cpus_call(cpu_mask, NOSYNC, kperf_ipi_handler, trigger); |
| | 86 | } |
| | 87 | |
| | 88 | return system_only_self; |
| | 89 | } |
projects / apple / xnu.git / blame_incremental