^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 1) // SPDX-License-Identifier: GPL-2.0
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 2) /*
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 3) * This code maintains a list of active profiling data structures.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 4) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 5) * Copyright IBM Corp. 2009
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 6) * Author(s): Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 7) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 8) * Uses gcc-internal data definitions.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 9) * Based on the gcov-kernel patch by:
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 10) * Hubertus Franke <frankeh@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 11) * Nigel Hinds <nhinds@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 12) * Rajan Ravindran <rajancr@us.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 13) * Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 14) * Paul Larson
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 15) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 16)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 17) #define pr_fmt(fmt) "gcov: " fmt
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 18)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 19) #include <linux/init.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 20) #include <linux/module.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 21) #include <linux/mutex.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 22) #include <linux/sched.h>
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 23) #include "gcov.h"
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 24)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 25) int gcov_events_enabled;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 26) DEFINE_MUTEX(gcov_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 27)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 28) /**
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 29) * gcov_enable_events - enable event reporting through gcov_event()
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 30) *
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 31) * Turn on reporting of profiling data load/unload-events through the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 32) * gcov_event() callback. Also replay all previous events once. This function
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 33) * is needed because some events are potentially generated too early for the
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 34) * callback implementation to handle them initially.
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 35) */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 36) void gcov_enable_events(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 37) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 38) struct gcov_info *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 39)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 40) mutex_lock(&gcov_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 41) gcov_events_enabled = 1;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 42)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 43) /* Perform event callback for previously registered entries. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 44) while ((info = gcov_info_next(info))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 45) gcov_event(GCOV_ADD, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 46) cond_resched();
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 47) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 48)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 49) mutex_unlock(&gcov_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 50) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 51)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 52) #ifdef CONFIG_MODULES
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 53) /* Update list and generate events when modules are unloaded. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 54) static int gcov_module_notifier(struct notifier_block *nb, unsigned long event,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 55) void *data)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 56) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 57) struct module *mod = data;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 58) struct gcov_info *info = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 59) struct gcov_info *prev = NULL;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 60)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 61) if (event != MODULE_STATE_GOING)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 62) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 63) mutex_lock(&gcov_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 64)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 65) /* Remove entries located in module from linked list. */
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 66) while ((info = gcov_info_next(info))) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 67) if (gcov_info_within_module(info, mod)) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 68) gcov_info_unlink(prev, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 69) if (gcov_events_enabled)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 70) gcov_event(GCOV_REMOVE, info);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 71) } else
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 72) prev = info;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 73) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 74)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 75) mutex_unlock(&gcov_lock);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 76)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 77) return NOTIFY_OK;
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 78) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 79)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 80) static struct notifier_block gcov_nb = {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 81) .notifier_call = gcov_module_notifier,
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 82) };
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 83)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 84) static int __init gcov_init(void)
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 85) {
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 86) return register_module_notifier(&gcov_nb);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 87) }
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 88) device_initcall(gcov_init);
^8f3ce5b39 (kx 2023-10-28 12:00:06 +0300 89) #endif /* CONFIG_MODULES */
Orange Pi5 kernel
Deprecated Linux kernel 5.10.110 for OrangePi 5/5B/5+ boards
3 Commits
0 Branches
0 Tags