1*4882a593Smuzhiyun /** 2*4882a593Smuzhiyun * @file init.c 3*4882a593Smuzhiyun * 4*4882a593Smuzhiyun * @remark Copyright 2002 OProfile authors 5*4882a593Smuzhiyun * @remark Read the file COPYING 6*4882a593Smuzhiyun * 7*4882a593Smuzhiyun * @author John Levon <levon@movementarian.org> 8*4882a593Smuzhiyun */ 9*4882a593Smuzhiyun 10*4882a593Smuzhiyun #include <linux/kernel.h> 11*4882a593Smuzhiyun #include <linux/oprofile.h> 12*4882a593Smuzhiyun #include <linux/errno.h> 13*4882a593Smuzhiyun #include <linux/init.h> 14*4882a593Smuzhiyun #include <linux/param.h> /* for HZ */ 15*4882a593Smuzhiyun 16*4882a593Smuzhiyun #ifdef CONFIG_SPARC64 17*4882a593Smuzhiyun #include <linux/notifier.h> 18*4882a593Smuzhiyun #include <linux/rcupdate.h> 19*4882a593Smuzhiyun #include <linux/kdebug.h> 20*4882a593Smuzhiyun #include <asm/nmi.h> 21*4882a593Smuzhiyun profile_timer_exceptions_notify(struct notifier_block * self,unsigned long val,void * data)22*4882a593Smuzhiyunstatic int profile_timer_exceptions_notify(struct notifier_block *self, 23*4882a593Smuzhiyun unsigned long val, void *data) 24*4882a593Smuzhiyun { 25*4882a593Smuzhiyun struct die_args *args = data; 26*4882a593Smuzhiyun int ret = NOTIFY_DONE; 27*4882a593Smuzhiyun 28*4882a593Smuzhiyun switch (val) { 29*4882a593Smuzhiyun case DIE_NMI: 30*4882a593Smuzhiyun oprofile_add_sample(args->regs, 0); 31*4882a593Smuzhiyun ret = NOTIFY_STOP; 32*4882a593Smuzhiyun break; 33*4882a593Smuzhiyun default: 34*4882a593Smuzhiyun break; 35*4882a593Smuzhiyun } 36*4882a593Smuzhiyun return ret; 37*4882a593Smuzhiyun } 38*4882a593Smuzhiyun 39*4882a593Smuzhiyun static struct notifier_block profile_timer_exceptions_nb = { 40*4882a593Smuzhiyun .notifier_call = profile_timer_exceptions_notify, 41*4882a593Smuzhiyun }; 42*4882a593Smuzhiyun timer_start(void)43*4882a593Smuzhiyunstatic int timer_start(void) 44*4882a593Smuzhiyun { 45*4882a593Smuzhiyun if (register_die_notifier(&profile_timer_exceptions_nb)) 46*4882a593Smuzhiyun return 1; 47*4882a593Smuzhiyun nmi_adjust_hz(HZ); 48*4882a593Smuzhiyun return 0; 49*4882a593Smuzhiyun } 50*4882a593Smuzhiyun 51*4882a593Smuzhiyun timer_stop(void)52*4882a593Smuzhiyunstatic void timer_stop(void) 53*4882a593Smuzhiyun { 54*4882a593Smuzhiyun nmi_adjust_hz(1); 55*4882a593Smuzhiyun unregister_die_notifier(&profile_timer_exceptions_nb); 56*4882a593Smuzhiyun synchronize_rcu(); /* Allow already-started NMIs to complete. */ 57*4882a593Smuzhiyun } 58*4882a593Smuzhiyun op_nmi_timer_init(struct oprofile_operations * ops)59*4882a593Smuzhiyunstatic int op_nmi_timer_init(struct oprofile_operations *ops) 60*4882a593Smuzhiyun { 61*4882a593Smuzhiyun if (atomic_read(&nmi_active) <= 0) 62*4882a593Smuzhiyun return -ENODEV; 63*4882a593Smuzhiyun 64*4882a593Smuzhiyun ops->start = timer_start; 65*4882a593Smuzhiyun ops->stop = timer_stop; 66*4882a593Smuzhiyun ops->cpu_type = "timer"; 67*4882a593Smuzhiyun printk(KERN_INFO "oprofile: Using perfctr NMI timer interrupt.\n"); 68*4882a593Smuzhiyun return 0; 69*4882a593Smuzhiyun } 70*4882a593Smuzhiyun #endif 71*4882a593Smuzhiyun oprofile_arch_init(struct oprofile_operations * ops)72*4882a593Smuzhiyunint __init oprofile_arch_init(struct oprofile_operations *ops) 73*4882a593Smuzhiyun { 74*4882a593Smuzhiyun int ret = -ENODEV; 75*4882a593Smuzhiyun 76*4882a593Smuzhiyun #ifdef CONFIG_SPARC64 77*4882a593Smuzhiyun ret = op_nmi_timer_init(ops); 78*4882a593Smuzhiyun if (!ret) 79*4882a593Smuzhiyun return ret; 80*4882a593Smuzhiyun #endif 81*4882a593Smuzhiyun 82*4882a593Smuzhiyun return ret; 83*4882a593Smuzhiyun } 84*4882a593Smuzhiyun oprofile_arch_exit(void)85*4882a593Smuzhiyunvoid oprofile_arch_exit(void) 86*4882a593Smuzhiyun { 87*4882a593Smuzhiyun } 88