/** * @file init.c * * @remark Copyright 2002 OProfile authors * @remark Read the file COPYING * * @author John Levon <levon@movementarian.org> */ #include <linux/kernel.h> #include <linux/oprofile.h> #include <linux/errno.h> #include <linux/init.h> #include <linux/param.h> /* for HZ */ #ifdef CONFIG_SPARC64 #include <linux/notifier.h> #include <linux/rcupdate.h> #include <linux/kdebug.h> #include <asm/nmi.h> static int profile_timer_exceptions_notify(struct notifier_block *self, unsigned long val, void *data) { struct die_args *args = data; int ret = NOTIFY_DONE; switch (val) { case DIE_NMI: oprofile_add_sample(args->regs, 0); ret = NOTIFY_STOP; break; default: break; } return ret; } static struct notifier_block profile_timer_exceptions_nb = { .notifier_call = profile_timer_exceptions_notify, }; static int timer_start(void) { if (register_die_notifier(&profile_timer_exceptions_nb)) return 1; nmi_adjust_hz(HZ); return 0; } static void timer_stop(void) { nmi_adjust_hz(1); unregister_die_notifier(&profile_timer_exceptions_nb); synchronize_sched(); /* Allow already-started NMIs to complete. */ } static int op_nmi_timer_init(struct oprofile_operations *ops) { if (atomic_read(&nmi_active) <= 0) return -ENODEV; ops->start = timer_start; ops->stop = timer_stop; ops->cpu_type = "timer"; printk(KERN_INFO "oprofile: Using perfctr NMI timer interrupt.\n"); return 0; } #endif int __init oprofile_arch_init(struct oprofile_operations *ops) { int ret = -ENODEV; #ifdef CONFIG_SPARC64 ret = op_nmi_timer_init(ops); if (!ret) return ret; #endif return ret; } void oprofile_arch_exit(void) { }