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>

1 files changed, 580 insertions, 0 deletions

diff --git a/kernel/drivers/net/irda/irtty-sir.c b/kernel/drivers/net/irda/irtty-sir.c
new file mode 100644
index 000000000..696852eb2
--- /dev/null
+++ b/kernel/drivers/net/irda/irtty-sir.c
@@ -0,0 +1,580 @@
+/*********************************************************************
+ *                
+ * Filename:      irtty-sir.c
+ * Version:       2.0
+ * Description:   IrDA line discipline implementation
+ * Status:        Experimental.
+ * Author:        Dag Brattli <dagb@cs.uit.no>
+ * Created at:    Tue Dec  9 21:18:38 1997
+ * Modified at:   Sun Oct 27 22:13:30 2002
+ * Modified by:   Martin Diehl <mad@mdiehl.de>
+ * Sources:       slip.c by Laurence Culhane,   <loz@holmes.demon.co.uk>
+ *                          Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
+ * 
+ *     Copyright (c) 1998-2000 Dag Brattli,
+ *     Copyright (c) 2002 Martin Diehl,
+ *     All Rights Reserved.
+ *      
+ *     This program is free software; you can redistribute it and/or 
+ *     modify it under the terms of the GNU General Public License as 
+ *     published by the Free Software Foundation; either version 2 of 
+ *     the License, or (at your option) any later version.
+ *  
+ *     Neither Dag Brattli nor University of Tromsø admit liability nor
+ *     provide warranty for any of this software. This material is 
+ *     provided "AS-IS" and at no charge.
+ *     
+ ********************************************************************/    
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/tty.h>
+#include <linux/init.h>
+#include <asm/uaccess.h>
+#include <linux/delay.h>
+#include <linux/mutex.h>
+
+#include <net/irda/irda.h>
+#include <net/irda/irda_device.h>
+
+#include "sir-dev.h"
+#include "irtty-sir.h"
+
+static int qos_mtt_bits = 0x03;      /* 5 ms or more */
+
+module_param(qos_mtt_bits, int, 0);
+MODULE_PARM_DESC(qos_mtt_bits, "Minimum Turn Time");
+
+/* ------------------------------------------------------- */
+
+/* device configuration callbacks always invoked with irda-thread context */
+
+/* find out, how many chars we have in buffers below us
+ * this is allowed to lie, i.e. return less chars than we
+ * actually have. The returned value is used to determine
+ * how long the irdathread should wait before doing the
+ * real blocking wait_until_sent()
+ */
+
+static int irtty_chars_in_buffer(struct sir_dev *dev)
+{
+	struct sirtty_cb *priv = dev->priv;
+
+	IRDA_ASSERT(priv != NULL, return -1;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+	return tty_chars_in_buffer(priv->tty);
+}
+
+/* Wait (sleep) until underlaying hardware finished transmission
+ * i.e. hardware buffers are drained
+ * this must block and not return before all characters are really sent
+ *
+ * If the tty sits on top of a 16550A-like uart, there are typically
+ * up to 16 bytes in the fifo - f.e. 9600 bps 8N1 needs 16.7 msec
+ *
+ * With usbserial the uart-fifo is basically replaced by the converter's
+ * outgoing endpoint buffer, which can usually hold 64 bytes (at least).
+ * With pl2303 it appears we are safe with 60msec here.
+ *
+ * I really wish all serial drivers would provide
+ * correct implementation of wait_until_sent()
+ */
+
+#define USBSERIAL_TX_DONE_DELAY	60
+
+static void irtty_wait_until_sent(struct sir_dev *dev)
+{
+	struct sirtty_cb *priv = dev->priv;
+	struct tty_struct *tty;
+
+	IRDA_ASSERT(priv != NULL, return;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+	tty = priv->tty;
+	if (tty->ops->wait_until_sent) {
+		tty->ops->wait_until_sent(tty, msecs_to_jiffies(100));
+	}
+	else {
+		msleep(USBSERIAL_TX_DONE_DELAY);
+	}
+}
+
+/* 
+ *  Function irtty_change_speed (dev, speed)
+ *
+ *    Change the speed of the serial port.
+ *
+ * This may sleep in set_termios (usbserial driver f.e.) and must
+ * not be called from interrupt/timer/tasklet therefore.
+ * All such invocations are deferred to kIrDAd now so we can sleep there.
+ */
+
+static int irtty_change_speed(struct sir_dev *dev, unsigned speed)
+{
+	struct sirtty_cb *priv = dev->priv;
+	struct tty_struct *tty;
+        struct ktermios old_termios;
+	int cflag;
+
+	IRDA_ASSERT(priv != NULL, return -1;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+	tty = priv->tty;
+
+	down_write(&tty->termios_rwsem);
+	old_termios = tty->termios;
+	cflag = tty->termios.c_cflag;
+	tty_encode_baud_rate(tty, speed, speed);
+	if (tty->ops->set_termios)
+		tty->ops->set_termios(tty, &old_termios);
+	priv->io.speed = speed;
+	up_write(&tty->termios_rwsem);
+
+	return 0;
+}
+
+/*
+ * Function irtty_set_dtr_rts (dev, dtr, rts)
+ *
+ *    This function can be used by dongles etc. to set or reset the status
+ *    of the dtr and rts lines
+ */
+
+static int irtty_set_dtr_rts(struct sir_dev *dev, int dtr, int rts)
+{
+	struct sirtty_cb *priv = dev->priv;
+	int set = 0;
+	int clear = 0;
+
+	IRDA_ASSERT(priv != NULL, return -1;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+	if (rts)
+		set |= TIOCM_RTS;
+	else
+		clear |= TIOCM_RTS;
+	if (dtr)
+		set |= TIOCM_DTR;
+	else
+		clear |= TIOCM_DTR;
+
+	/*
+	 * We can't use ioctl() because it expects a non-null file structure,
+	 * and we don't have that here.
+	 * This function is not yet defined for all tty driver, so
+	 * let's be careful... Jean II
+	 */
+	IRDA_ASSERT(priv->tty->ops->tiocmset != NULL, return -1;);
+	priv->tty->ops->tiocmset(priv->tty, set, clear);
+
+	return 0;
+}
+
+/* ------------------------------------------------------- */
+
+/* called from sir_dev when there is more data to send
+ * context is either netdev->hard_xmit or some transmit-completion bh
+ * i.e. we are under spinlock here and must not sleep.
+ */
+
+static int irtty_do_write(struct sir_dev *dev, const unsigned char *ptr, size_t len)
+{
+	struct sirtty_cb *priv = dev->priv;
+	struct tty_struct *tty;
+	int writelen;
+
+	IRDA_ASSERT(priv != NULL, return -1;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -1;);
+
+	tty = priv->tty;
+	if (!tty->ops->write)
+		return 0;
+	set_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+	writelen = tty_write_room(tty);
+	if (writelen > len)
+		writelen = len;
+	return tty->ops->write(tty, ptr, writelen);
+}
+
+/* ------------------------------------------------------- */
+
+/* irda line discipline callbacks */
+
+/* 
+ *  Function irtty_receive_buf( tty, cp, count)
+ *
+ *    Handle the 'receiver data ready' interrupt.  This function is called
+ *    by the 'tty_io' module in the kernel when a block of IrDA data has
+ *    been received, which can now be decapsulated and delivered for
+ *    further processing 
+ *
+ * calling context depends on underlying driver and tty->port->low_latency!
+ * for example (low_latency: 1 / 0):
+ * serial.c:	uart-interrupt / softint
+ * usbserial:	urb-complete-interrupt / softint
+ */
+
+static void irtty_receive_buf(struct tty_struct *tty, const unsigned char *cp,
+			      char *fp, int count) 
+{
+	struct sir_dev *dev;
+	struct sirtty_cb *priv = tty->disc_data;
+	int	i;
+
+	IRDA_ASSERT(priv != NULL, return;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+	if (unlikely(count==0))		/* yes, this happens */
+		return;
+
+	dev = priv->dev;
+	if (!dev) {
+		net_warn_ratelimited("%s(), not ready yet!\n", __func__);
+		return;
+	}
+
+	for (i = 0; i < count; i++) {
+		/* 
+		 *  Characters received with a parity error, etc?
+		 */
+ 		if (fp && *fp++) { 
+			pr_debug("Framing or parity error!\n");
+			sirdev_receive(dev, NULL, 0);	/* notify sir_dev (updating stats) */
+			return;
+ 		}
+	}
+
+	sirdev_receive(dev, cp, count);
+}
+
+/*
+ * Function irtty_write_wakeup (tty)
+ *
+ *    Called by the driver when there's room for more data.  If we have
+ *    more packets to send, we send them here.
+ *
+ */
+static void irtty_write_wakeup(struct tty_struct *tty) 
+{
+	struct sirtty_cb *priv = tty->disc_data;
+
+	IRDA_ASSERT(priv != NULL, return;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+	if (priv->dev)
+		sirdev_write_complete(priv->dev);
+}
+
+/* ------------------------------------------------------- */
+
+/*
+ * Function irtty_stop_receiver (tty, stop)
+ *
+ */
+
+static inline void irtty_stop_receiver(struct tty_struct *tty, int stop)
+{
+	struct ktermios old_termios;
+	int cflag;
+
+	down_write(&tty->termios_rwsem);
+	old_termios = tty->termios;
+	cflag = tty->termios.c_cflag;
+	
+	if (stop)
+		cflag &= ~CREAD;
+	else
+		cflag |= CREAD;
+
+	tty->termios.c_cflag = cflag;
+	if (tty->ops->set_termios)
+		tty->ops->set_termios(tty, &old_termios);
+	up_write(&tty->termios_rwsem);
+}
+
+/*****************************************************************/
+
+/* serialize ldisc open/close with sir_dev */
+static DEFINE_MUTEX(irtty_mutex);
+
+/* notifier from sir_dev when irda% device gets opened (ifup) */
+
+static int irtty_start_dev(struct sir_dev *dev)
+{
+	struct sirtty_cb *priv;
+	struct tty_struct *tty;
+
+	/* serialize with ldisc open/close */
+	mutex_lock(&irtty_mutex);
+
+	priv = dev->priv;
+	if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
+		mutex_unlock(&irtty_mutex);
+		return -ESTALE;
+	}
+
+	tty = priv->tty;
+
+	if (tty->ops->start)
+		tty->ops->start(tty);
+	/* Make sure we can receive more data */
+	irtty_stop_receiver(tty, FALSE);
+
+	mutex_unlock(&irtty_mutex);
+	return 0;
+}
+
+/* notifier from sir_dev when irda% device gets closed (ifdown) */
+
+static int irtty_stop_dev(struct sir_dev *dev)
+{
+	struct sirtty_cb *priv;
+	struct tty_struct *tty;
+
+	/* serialize with ldisc open/close */
+	mutex_lock(&irtty_mutex);
+
+	priv = dev->priv;
+	if (unlikely(!priv || priv->magic!=IRTTY_MAGIC)) {
+		mutex_unlock(&irtty_mutex);
+		return -ESTALE;
+	}
+
+	tty = priv->tty;
+
+	/* Make sure we don't receive more data */
+	irtty_stop_receiver(tty, TRUE);
+	if (tty->ops->stop)
+		tty->ops->stop(tty);
+
+	mutex_unlock(&irtty_mutex);
+
+	return 0;
+}
+
+/* ------------------------------------------------------- */
+
+static struct sir_driver sir_tty_drv = {
+	.owner			= THIS_MODULE,
+	.driver_name		= "sir_tty",
+	.start_dev		= irtty_start_dev,
+	.stop_dev		= irtty_stop_dev,
+	.do_write		= irtty_do_write,
+	.chars_in_buffer	= irtty_chars_in_buffer,
+	.wait_until_sent	= irtty_wait_until_sent,
+	.set_speed		= irtty_change_speed,
+	.set_dtr_rts		= irtty_set_dtr_rts,
+};
+
+/* ------------------------------------------------------- */
+
+/*
+ * Function irtty_ioctl (tty, file, cmd, arg)
+ *
+ *     The Swiss army knife of system calls :-)
+ *
+ */
+static int irtty_ioctl(struct tty_struct *tty, struct file *file, unsigned int cmd, unsigned long arg)
+{
+	struct irtty_info { char name[6]; } info;
+	struct sir_dev *dev;
+	struct sirtty_cb *priv = tty->disc_data;
+	int err = 0;
+
+	IRDA_ASSERT(priv != NULL, return -ENODEV;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return -EBADR;);
+
+	pr_debug("%s(cmd=0x%X)\n", __func__, cmd);
+
+	dev = priv->dev;
+	IRDA_ASSERT(dev != NULL, return -1;);
+
+	switch (cmd) {
+	case IRTTY_IOCTDONGLE:
+		/* this call blocks for completion */
+		err = sirdev_set_dongle(dev, (IRDA_DONGLE) arg);
+		break;
+
+	case IRTTY_IOCGET:
+		IRDA_ASSERT(dev->netdev != NULL, return -1;);
+
+		memset(&info, 0, sizeof(info)); 
+		strncpy(info.name, dev->netdev->name, sizeof(info.name)-1);
+
+		if (copy_to_user((void __user *)arg, &info, sizeof(info)))
+			err = -EFAULT;
+		break;
+	default:
+		err = tty_mode_ioctl(tty, file, cmd, arg);
+		break;
+	}
+	return err;
+}
+
+
+/* 
+ *  Function irtty_open(tty)
+ *
+ *    This function is called by the TTY module when the IrDA line
+ *    discipline is called for.  Because we are sure the tty line exists,
+ *    we only have to link it to a free IrDA channel.  
+ */
+static int irtty_open(struct tty_struct *tty) 
+{
+	struct sir_dev *dev;
+	struct sirtty_cb *priv;
+	int ret = 0;
+
+	/* Module stuff handled via irda_ldisc.owner - Jean II */
+
+	/* First make sure we're not already connected. */
+	if (tty->disc_data != NULL) {
+		priv = tty->disc_data;
+		if (priv && priv->magic == IRTTY_MAGIC) {
+			ret = -EEXIST;
+			goto out;
+		}
+		tty->disc_data = NULL;		/* ### */
+	}
+
+	/* stop the underlying  driver */
+	irtty_stop_receiver(tty, TRUE);
+	if (tty->ops->stop)
+		tty->ops->stop(tty);
+
+	tty_driver_flush_buffer(tty);
+	
+	/* apply mtt override */
+	sir_tty_drv.qos_mtt_bits = qos_mtt_bits;
+
+	/* get a sir device instance for this driver */
+	dev = sirdev_get_instance(&sir_tty_drv, tty->name);
+	if (!dev) {
+		ret = -ENODEV;
+		goto out;
+	}
+
+	/* allocate private device info block */
+	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	if (!priv) {
+		ret = -ENOMEM;
+		goto out_put;
+	}
+
+	priv->magic = IRTTY_MAGIC;
+	priv->tty = tty;
+	priv->dev = dev;
+
+	/* serialize with start_dev - in case we were racing with ifup */
+	mutex_lock(&irtty_mutex);
+
+	dev->priv = priv;
+	tty->disc_data = priv;
+	tty->receive_room = 65536;
+
+	mutex_unlock(&irtty_mutex);
+
+	pr_debug("%s - %s: irda line discipline opened\n", __func__, tty->name);
+
+	return 0;
+
+out_put:
+	sirdev_put_instance(dev);
+out:
+	return ret;
+}
+
+/* 
+ *  Function irtty_close (tty)
+ *
+ *    Close down a IrDA channel. This means flushing out any pending queues,
+ *    and then restoring the TTY line discipline to what it was before it got
+ *    hooked to IrDA (which usually is TTY again).  
+ */
+static void irtty_close(struct tty_struct *tty) 
+{
+	struct sirtty_cb *priv = tty->disc_data;
+
+	IRDA_ASSERT(priv != NULL, return;);
+	IRDA_ASSERT(priv->magic == IRTTY_MAGIC, return;);
+
+	/* Hm, with a dongle attached the dongle driver wants
+	 * to close the dongle - which requires the use of
+	 * some tty write and/or termios or ioctl operations.
+	 * Are we allowed to call those when already requested
+	 * to shutdown the ldisc?
+	 * If not, we should somehow mark the dev being staled.
+	 * Question remains, how to close the dongle in this case...
+	 * For now let's assume we are granted to issue tty driver calls
+	 * until we return here from the ldisc close. I'm just wondering
+	 * how this behaves with hotpluggable serial hardware like
+	 * rs232-pcmcia card or usb-serial...
+	 *
+	 * priv->tty = NULL?;
+	 */
+
+	/* we are dead now */
+	tty->disc_data = NULL;
+
+	sirdev_put_instance(priv->dev);
+
+	/* Stop tty */
+	clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags);
+	if (tty->ops->stop)
+		tty->ops->stop(tty);
+
+	kfree(priv);
+
+	pr_debug("%s - %s: irda line discipline closed\n", __func__, tty->name);
+}
+
+/* ------------------------------------------------------- */
+
+static struct tty_ldisc_ops irda_ldisc = {
+	.magic		= TTY_LDISC_MAGIC,
+ 	.name		= "irda",
+	.flags		= 0,
+	.open		= irtty_open,
+	.close		= irtty_close,
+	.read		= NULL,
+	.write		= NULL,
+	.ioctl		= irtty_ioctl,
+ 	.poll		= NULL,
+	.receive_buf	= irtty_receive_buf,
+	.write_wakeup	= irtty_write_wakeup,
+	.owner		= THIS_MODULE,
+};
+
+/* ------------------------------------------------------- */
+
+static int __init irtty_sir_init(void)
+{
+	int err;
+
+	if ((err = tty_register_ldisc(N_IRDA, &irda_ldisc)) != 0)
+		net_err_ratelimited("IrDA: can't register line discipline (err = %d)\n",
+				    err);
+	return err;
+}
+
+static void __exit irtty_sir_cleanup(void) 
+{
+	int err;
+
+	if ((err = tty_unregister_ldisc(N_IRDA))) {
+		net_err_ratelimited("%s(), can't unregister line discipline (err = %d)\n",
+				    __func__, err);
+	}
+}
+
+module_init(irtty_sir_init);
+module_exit(irtty_sir_cleanup);
+
+MODULE_AUTHOR("Dag Brattli <dagb@cs.uit.no>");
+MODULE_DESCRIPTION("IrDA TTY device driver");
+MODULE_ALIAS_LDISC(N_IRDA);
+MODULE_LICENSE("GPL");
+