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Linux/arch/sparc/oprofile/init.c

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

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