sparc: using HZ needs an include of linux/param.h
[linux-2.6.git] / arch / sparc / oprofile / init.c
index 17bb603..f9024bc 100644 (file)
 #include <linux/oprofile.h>
 #include <linux/errno.h>
 #include <linux/init.h>
+#include <linux/param.h>       /* for HZ */
  
-int __init oprofile_arch_init(struct oprofile_operations *ops)
+#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)
 {
-       return -ENODEV;
+       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)
 {