Initial import

1 files changed, 87 insertions, 0 deletions

diff --git a/arch/sparc/oprofile/init.c b/arch/sparc/oprofile/init.c
new file mode 100644
index 000000000..f9024bccf
--- /dev/null
+++ b/arch/sparc/oprofile/init.c
@@ -0,0 +1,87 @@
+/**
+ * @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)
+{
+}