From 769bc1fd7b8591a312d4c5c8834bc6510272938e Mon Sep 17 00:00:00 2001
From: Vineet Gupta <vgupta@synopsys.com>
Date: Tue, 22 Jan 2013 17:02:38 +0530
Subject: [PATCH] ARC: OProfile support

Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Robert Richter <rric@kernel.org>
Cc: oprofile-list@lists.sf.net
Reviewed-by: James Hogan <james.hogan@imgtec.com>
---
 arch/arc/Kconfig           |  1 +
 arch/arc/Makefile          |  2 ++
 arch/arc/oprofile/Makefile |  9 +++++++++
 arch/arc/oprofile/common.c | 26 ++++++++++++++++++++++++++
 4 files changed, 38 insertions(+)
 create mode 100644 arch/arc/oprofile/Makefile
 create mode 100644 arch/arc/oprofile/common.c

diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig
index 409b9378032e..405ea7a756b8 100644
--- a/arch/arc/Kconfig
+++ b/arch/arc/Kconfig
@@ -25,6 +25,7 @@ config ARC
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_GENERIC_HARDIRQS
 	select HAVE_MEMBLOCK
+	select HAVE_OPROFILE
 	select IRQ_DOMAIN
 	select MODULES_USE_ELF_RELA
 	select NO_BOOTMEM
diff --git a/arch/arc/Makefile b/arch/arc/Makefile
index 5c98fc19d99d..642c0406d600 100644
--- a/arch/arc/Makefile
+++ b/arch/arc/Makefile
@@ -100,6 +100,8 @@ ifneq ($(platform-y),)
 core-y		+= arch/arc/plat-$(PLATFORM)/
 endif
 
+drivers-$(CONFIG_OPROFILE)	+= arch/arc/oprofile/
+
 libs-y		+= arch/arc/lib/ $(LIBGCC)
 
 #default target for make without any arguements.
diff --git a/arch/arc/oprofile/Makefile b/arch/arc/oprofile/Makefile
new file mode 100644
index 000000000000..ce417a6e70b8
--- /dev/null
+++ b/arch/arc/oprofile/Makefile
@@ -0,0 +1,9 @@
+obj-$(CONFIG_OPROFILE) += oprofile.o
+
+DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
+		oprof.o cpu_buffer.o buffer_sync.o \
+		event_buffer.o oprofile_files.o \
+		oprofilefs.o oprofile_stats.o \
+		timer_int.o )
+
+oprofile-y	:= $(DRIVER_OBJS) common.o
diff --git a/arch/arc/oprofile/common.c b/arch/arc/oprofile/common.c
new file mode 100644
index 000000000000..c80fcad4a5a7
--- /dev/null
+++ b/arch/arc/oprofile/common.c
@@ -0,0 +1,26 @@
+/*
+ * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * Based on orig code from @author John Levon <levon@movementarian.org>
+ */
+
+#include <linux/oprofile.h>
+#include <linux/perf_event.h>
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+	/*
+	 * A failure here, forces oprofile core to switch to Timer based PC
+	 * sampling, which will happen if say perf is not enabled/available
+	 */
+	return oprofile_perf_init(ops);
+}
+
+void oprofile_arch_exit(void)
+{
+	oprofile_perf_exit();
+}