Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

3 files changed, 170 insertions, 0 deletions

diff --git a/kernel/arch/sh/oprofile/Makefile b/kernel/arch/sh/oprofile/Makefile
new file mode 100644
index 000000000..ce3b11902
--- /dev/null
+++ b/kernel/arch/sh/oprofile/Makefile
@@ -0,0 +1,15 @@
+obj-$(CONFIG_OPROFILE) += oprofile.o
+
+CFLAGS_common.o	+= -DUTS_MACHINE='"$(UTS_MACHINE)"'
+
+DRIVER_OBJS = $(addprefix ../../../drivers/oprofile/, \
+		oprof.o cpu_buffer.o buffer_sync.o \
+		event_buffer.o oprofile_files.o \
+		oprofilefs.o oprofile_stats.o \
+		timer_int.o )
+
+ifeq ($(CONFIG_HW_PERF_EVENTS),y)
+DRIVER_OBJS += $(addprefix ../../../drivers/oprofile/, oprofile_perf.o)
+endif
+
+oprofile-y	:= $(DRIVER_OBJS) common.o backtrace.o
diff --git a/kernel/arch/sh/oprofile/backtrace.c b/kernel/arch/sh/oprofile/backtrace.c
new file mode 100644
index 000000000..9c88dcd56
--- /dev/null
+++ b/kernel/arch/sh/oprofile/backtrace.c
@@ -0,0 +1,91 @@
+/*
+ * SH specific backtracing code for oprofile
+ *
+ * Copyright 2007 STMicroelectronics Ltd.
+ *
+ * Author: Dave Peverley <dpeverley@mpc-data.co.uk>
+ *
+ * Based on ARM oprofile backtrace code by Richard Purdie and in turn, i386
+ * oprofile backtrace code by John Levon, David Smith
+ *
+ * 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.
+ *
+ */
+#include <linux/oprofile.h>
+#include <linux/sched.h>
+#include <linux/kallsyms.h>
+#include <linux/mm.h>
+#include <asm/unwinder.h>
+#include <asm/ptrace.h>
+#include <asm/uaccess.h>
+#include <asm/sections.h>
+#include <asm/stacktrace.h>
+
+static int backtrace_stack(void *data, char *name)
+{
+	/* Yes, we want all stacks */
+	return 0;
+}
+
+static void backtrace_address(void *data, unsigned long addr, int reliable)
+{
+	unsigned int *depth = data;
+
+	if ((*depth)--)
+		oprofile_add_trace(addr);
+}
+
+static struct stacktrace_ops backtrace_ops = {
+	.stack = backtrace_stack,
+	.address = backtrace_address,
+};
+
+/* Limit to stop backtracing too far. */
+static int backtrace_limit = 20;
+
+static unsigned long *
+user_backtrace(unsigned long *stackaddr, struct pt_regs *regs)
+{
+	unsigned long buf_stack;
+
+	/* Also check accessibility of address */
+	if (!access_ok(VERIFY_READ, stackaddr, sizeof(unsigned long)))
+		return NULL;
+
+	if (__copy_from_user_inatomic(&buf_stack, stackaddr, sizeof(unsigned long)))
+		return NULL;
+
+	/* Quick paranoia check */
+	if (buf_stack & 3)
+		return NULL;
+
+	oprofile_add_trace(buf_stack);
+
+	stackaddr++;
+
+	return stackaddr;
+}
+
+void sh_backtrace(struct pt_regs * const regs, unsigned int depth)
+{
+	unsigned long *stackaddr;
+
+	/*
+	 * Paranoia - clip max depth as we could get lost in the weeds.
+	 */
+	if (depth > backtrace_limit)
+		depth = backtrace_limit;
+
+	stackaddr = (unsigned long *)kernel_stack_pointer(regs);
+	if (!user_mode(regs)) {
+		if (depth)
+			unwind_stack(NULL, regs, stackaddr,
+				     &backtrace_ops, &depth);
+		return;
+	}
+
+	while (depth-- && (stackaddr != NULL))
+		stackaddr = user_backtrace(stackaddr, regs);
+}
diff --git a/kernel/arch/sh/oprofile/common.c b/kernel/arch/sh/oprofile/common.c
new file mode 100644
index 000000000..e4dd5d5a1
--- /dev/null
+++ b/kernel/arch/sh/oprofile/common.c
@@ -0,0 +1,64 @@
+/*
+ * arch/sh/oprofile/init.c
+ *
+ * Copyright (C) 2003 - 2010  Paul Mundt
+ *
+ * Based on arch/mips/oprofile/common.c:
+ *
+ *	Copyright (C) 2004, 2005 Ralf Baechle
+ *	Copyright (C) 2005 MIPS Technologies, Inc.
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License.  See the file "COPYING" in the main directory of this archive
+ * for more details.
+ */
+#include <linux/kernel.h>
+#include <linux/oprofile.h>
+#include <linux/init.h>
+#include <linux/errno.h>
+#include <linux/smp.h>
+#include <linux/perf_event.h>
+#include <linux/slab.h>
+#include <asm/processor.h>
+
+extern void sh_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+#ifdef CONFIG_HW_PERF_EVENTS
+/*
+ * This will need to be reworked when multiple PMUs are supported.
+ */
+static char *sh_pmu_op_name;
+
+char *op_name_from_perf_id(void)
+{
+	return sh_pmu_op_name;
+}
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+	ops->backtrace = sh_backtrace;
+
+	if (perf_num_counters() == 0)
+		return -ENODEV;
+
+	sh_pmu_op_name = kasprintf(GFP_KERNEL, "%s/%s",
+				   UTS_MACHINE, perf_pmu_name());
+	if (unlikely(!sh_pmu_op_name))
+		return -ENOMEM;
+
+	return oprofile_perf_init(ops);
+}
+
+void oprofile_arch_exit(void)
+{
+	oprofile_perf_exit();
+	kfree(sh_pmu_op_name);
+}
+#else
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+	ops->backtrace = sh_backtrace;
+	return -ENODEV;
+}
+void oprofile_arch_exit(void) {}
+#endif /* CONFIG_HW_PERF_EVENTS */