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, 325 insertions, 0 deletions

diff --git a/kernel/arch/avr32/oprofile/Makefile b/kernel/arch/avr32/oprofile/Makefile
new file mode 100644
index 000000000..e0eb520e0
--- /dev/null
+++ b/kernel/arch/avr32/oprofile/Makefile
@@ -0,0 +1,8 @@
+obj-$(CONFIG_OPROFILE) += oprofile.o
+
+oprofile-y		:= $(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		+= op_model_avr32.o backtrace.o
diff --git a/kernel/arch/avr32/oprofile/backtrace.c b/kernel/arch/avr32/oprofile/backtrace.c
new file mode 100644
index 000000000..75d9ad6f9
--- /dev/null
+++ b/kernel/arch/avr32/oprofile/backtrace.c
@@ -0,0 +1,81 @@
+/*
+ * AVR32 specific backtracing code for oprofile
+ *
+ * Copyright 2008 Weinmann GmbH
+ *
+ * Author: Nikolaus Voss <n.voss@weinmann.de>
+ *
+ * Based on i386 oprofile backtrace code by John Levon and 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/uaccess.h>
+
+/* The first two words of each frame on the stack look like this if we have
+ * frame pointers */
+struct frame_head {
+	unsigned long lr;
+	struct frame_head *fp;
+};
+
+/* copied from arch/avr32/kernel/process.c */
+static inline int valid_stack_ptr(struct thread_info *tinfo, unsigned long p)
+{
+	return (p > (unsigned long)tinfo)
+		&& (p < (unsigned long)tinfo + THREAD_SIZE - 3);
+}
+
+/* copied from arch/x86/oprofile/backtrace.c */
+static struct frame_head *dump_user_backtrace(struct frame_head *head)
+{
+	struct frame_head bufhead[2];
+
+	/* Also check accessibility of one struct frame_head beyond */
+	if (!access_ok(VERIFY_READ, head, sizeof(bufhead)))
+		return NULL;
+	if (__copy_from_user_inatomic(bufhead, head, sizeof(bufhead)))
+		return NULL;
+
+	oprofile_add_trace(bufhead[0].lr);
+
+	/* frame pointers should strictly progress back up the stack
+	 * (towards higher addresses) */
+	if (bufhead[0].fp <= head)
+		return NULL;
+
+	return bufhead[0].fp;
+}
+
+void avr32_backtrace(struct pt_regs * const regs, unsigned int depth)
+{
+	/* Get first frame pointer */
+	struct frame_head *head = (struct frame_head *)(regs->r7);
+
+	if (!user_mode(regs)) {
+#ifdef CONFIG_FRAME_POINTER
+		/*
+		 * Traverse the kernel stack from frame to frame up to
+		 * "depth" steps.
+		 */
+		while (depth-- && valid_stack_ptr(task_thread_info(current),
+						  (unsigned long)head)) {
+			oprofile_add_trace(head->lr);
+			if (head->fp <= head)
+				break;
+			head = head->fp;
+		}
+#endif
+	} else {
+		/* Assume we have frame pointers in user mode process */
+		while (depth-- && head)
+			head = dump_user_backtrace(head);
+	}
+}
+
+
diff --git a/kernel/arch/avr32/oprofile/op_model_avr32.c b/kernel/arch/avr32/oprofile/op_model_avr32.c
new file mode 100644
index 000000000..08308be2c
--- /dev/null
+++ b/kernel/arch/avr32/oprofile/op_model_avr32.c
@@ -0,0 +1,236 @@
+/*
+ * AVR32 Performance Counter Driver
+ *
+ * Copyright (C) 2005-2007 Atmel Corporation
+ *
+ * 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.
+ *
+ * Author: Ronny Pedersen
+ */
+#include <linux/errno.h>
+#include <linux/interrupt.h>
+#include <linux/irq.h>
+#include <linux/oprofile.h>
+#include <linux/sched.h>
+#include <linux/types.h>
+
+#include <asm/sysreg.h>
+
+#define AVR32_PERFCTR_IRQ_GROUP	0
+#define AVR32_PERFCTR_IRQ_LINE	1
+
+void avr32_backtrace(struct pt_regs * const regs, unsigned int depth);
+
+enum { PCCNT, PCNT0, PCNT1, NR_counter };
+
+struct avr32_perf_counter {
+	unsigned long	enabled;
+	unsigned long	event;
+	unsigned long	count;
+	unsigned long	unit_mask;
+	unsigned long	kernel;
+	unsigned long	user;
+
+	u32		ie_mask;
+	u32		flag_mask;
+};
+
+static struct avr32_perf_counter counter[NR_counter] = {
+	{
+		.ie_mask	= SYSREG_BIT(IEC),
+		.flag_mask	= SYSREG_BIT(FC),
+	}, {
+		.ie_mask	= SYSREG_BIT(IE0),
+		.flag_mask	= SYSREG_BIT(F0),
+	}, {
+		.ie_mask	= SYSREG_BIT(IE1),
+		.flag_mask	= SYSREG_BIT(F1),
+	},
+};
+
+static void avr32_perf_counter_reset(void)
+{
+	/* Reset all counter and disable/clear all interrupts */
+	sysreg_write(PCCR, (SYSREG_BIT(PCCR_R)
+				| SYSREG_BIT(PCCR_C)
+				| SYSREG_BIT(FC)
+				| SYSREG_BIT(F0)
+				| SYSREG_BIT(F1)));
+}
+
+static irqreturn_t avr32_perf_counter_interrupt(int irq, void *dev_id)
+{
+	struct avr32_perf_counter *ctr = dev_id;
+	struct pt_regs *regs;
+	u32 pccr;
+
+	if (likely(!(intc_get_pending(AVR32_PERFCTR_IRQ_GROUP)
+					& (1 << AVR32_PERFCTR_IRQ_LINE))))
+		return IRQ_NONE;
+
+	regs = get_irq_regs();
+	pccr = sysreg_read(PCCR);
+
+	/* Clear the interrupt flags we're about to handle */
+	sysreg_write(PCCR, pccr);
+
+	/* PCCNT */
+	if (ctr->enabled && (pccr & ctr->flag_mask)) {
+		sysreg_write(PCCNT, -ctr->count);
+		oprofile_add_sample(regs, PCCNT);
+	}
+	ctr++;
+	/* PCNT0 */
+	if (ctr->enabled && (pccr & ctr->flag_mask)) {
+		sysreg_write(PCNT0, -ctr->count);
+		oprofile_add_sample(regs, PCNT0);
+	}
+	ctr++;
+	/* PCNT1 */
+	if (ctr->enabled && (pccr & ctr->flag_mask)) {
+		sysreg_write(PCNT1, -ctr->count);
+		oprofile_add_sample(regs, PCNT1);
+	}
+
+	return IRQ_HANDLED;
+}
+
+static int avr32_perf_counter_create_files(struct dentry *root)
+{
+	struct dentry *dir;
+	unsigned int i;
+	char filename[4];
+
+	for (i = 0; i < NR_counter; i++) {
+		snprintf(filename, sizeof(filename), "%u", i);
+		dir = oprofilefs_mkdir(root, filename);
+
+		oprofilefs_create_ulong(dir, "enabled",
+				&counter[i].enabled);
+		oprofilefs_create_ulong(dir, "event",
+				&counter[i].event);
+		oprofilefs_create_ulong(dir, "count",
+				&counter[i].count);
+
+		/* Dummy entries */
+		oprofilefs_create_ulong(dir, "kernel",
+				&counter[i].kernel);
+		oprofilefs_create_ulong(dir, "user",
+				&counter[i].user);
+		oprofilefs_create_ulong(dir, "unit_mask",
+				&counter[i].unit_mask);
+	}
+
+	return 0;
+}
+
+static int avr32_perf_counter_setup(void)
+{
+	struct avr32_perf_counter *ctr;
+	u32 pccr;
+	int ret;
+	int i;
+
+	pr_debug("avr32_perf_counter_setup\n");
+
+	if (sysreg_read(PCCR) & SYSREG_BIT(PCCR_E)) {
+		printk(KERN_ERR
+			"oprofile: setup: perf counter already enabled\n");
+		return -EBUSY;
+	}
+
+	ret = request_irq(AVR32_PERFCTR_IRQ_GROUP,
+			avr32_perf_counter_interrupt, IRQF_SHARED,
+			"oprofile", counter);
+	if (ret)
+		return ret;
+
+	avr32_perf_counter_reset();
+
+	pccr = 0;
+	for (i = PCCNT; i < NR_counter; i++) {
+		ctr = &counter[i];
+		if (!ctr->enabled)
+			continue;
+
+		pr_debug("enabling counter %d...\n", i);
+
+		pccr |= ctr->ie_mask;
+
+		switch (i) {
+		case PCCNT:
+			/* PCCNT always counts cycles, so no events */
+			sysreg_write(PCCNT, -ctr->count);
+			break;
+		case PCNT0:
+			pccr |= SYSREG_BF(CONF0, ctr->event);
+			sysreg_write(PCNT0, -ctr->count);
+			break;
+		case PCNT1:
+			pccr |= SYSREG_BF(CONF1, ctr->event);
+			sysreg_write(PCNT1, -ctr->count);
+			break;
+		}
+	}
+
+	pr_debug("oprofile: writing 0x%x to PCCR...\n", pccr);
+
+	sysreg_write(PCCR, pccr);
+
+	return 0;
+}
+
+static void avr32_perf_counter_shutdown(void)
+{
+	pr_debug("avr32_perf_counter_shutdown\n");
+
+	avr32_perf_counter_reset();
+	free_irq(AVR32_PERFCTR_IRQ_GROUP, counter);
+}
+
+static int avr32_perf_counter_start(void)
+{
+	pr_debug("avr32_perf_counter_start\n");
+
+	sysreg_write(PCCR, sysreg_read(PCCR) | SYSREG_BIT(PCCR_E));
+
+	return 0;
+}
+
+static void avr32_perf_counter_stop(void)
+{
+	pr_debug("avr32_perf_counter_stop\n");
+
+	sysreg_write(PCCR, sysreg_read(PCCR) & ~SYSREG_BIT(PCCR_E));
+}
+
+static struct oprofile_operations avr32_perf_counter_ops __initdata = {
+	.create_files	= avr32_perf_counter_create_files,
+	.setup		= avr32_perf_counter_setup,
+	.shutdown	= avr32_perf_counter_shutdown,
+	.start		= avr32_perf_counter_start,
+	.stop		= avr32_perf_counter_stop,
+	.cpu_type	= "avr32",
+};
+
+int __init oprofile_arch_init(struct oprofile_operations *ops)
+{
+	if (!(current_cpu_data.features & AVR32_FEATURE_PCTR))
+		return -ENODEV;
+
+	memcpy(ops, &avr32_perf_counter_ops,
+			sizeof(struct oprofile_operations));
+
+	ops->backtrace = avr32_backtrace;
+
+	printk(KERN_INFO "oprofile: using AVR32 performance monitoring.\n");
+
+	return 0;
+}
+
+void oprofile_arch_exit(void)
+{
+
+}