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