linux-imx

/*

 *  linux/drivers/net/netconsole.c

 *

 *  Copyright (C) 2001  Ingo Molnar <mingo@redhat.com>

 *

 *  This file contains the implementation of an IRQ-safe, crash-safe

 *  kernel console implementation that outputs kernel messages to the

 *  network.

 *

 * Modification history:

 *

 * 2001-09-17    started by Ingo Molnar.

 * 2003-08-11    2.6 port by Matt Mackall

 *               simplified options

 *               generic card hooks

 *               works non-modular

 * 2003-09-07    rewritten with netpoll api

 */

​

/****************************************************************

 *      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, or (at your option)

 *      any later version.

 *

 *      This program is distributed in the hope that it will be useful,

 *      but WITHOUT ANY WARRANTY; without even the implied warranty of

 *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 *      GNU General Public License for more details.

 *

 *      You should have received a copy of the GNU General Public License

 *      along with this program; if not, write to the Free Software

 *      Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 ****************************************************************/

​

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

​

#include <linux/mm.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/slab.h>

#include <linux/console.h>

#include <linux/moduleparam.h>

#include <linux/kernel.h>

#include <linux/string.h>

#include <linux/netpoll.h>

#include <linux/inet.h>

#include <linux/configfs.h>

#include <linux/etherdevice.h>

​

MODULE_AUTHOR("Maintainer: Matt Mackall <mpm@selenic.com>");

MODULE_DESCRIPTION("Console driver for network interfaces");

MODULE_LICENSE("GPL");

​

#define MAX_PARAM_LENGTH    256

#define MAX_PRINT_CHUNK     1000

​

static char config[MAX_PARAM_LENGTH];

module_param_string(netconsole, config, MAX_PARAM_LENGTH, 0);

MODULE_PARM_DESC(netconsole, " netconsole=[src-port]@[src-ip]/[dev],[tgt-port]@<tgt-ip>/[tgt-macaddr]");

​

static bool oops_only = false;

module_param(oops_only, bool, 0600);

MODULE_PARM_DESC(oops_only, "Only log oops messages");

​

#ifndef MODULE

static int __init option_setup(char *opt)

{

    strlcpy(config, opt, MAX_PARAM_LENGTH);

    return 1;

}

__setup("netconsole=", option_setup);

#endif  /* MODULE */

​

/* Linked list of all configured targets */

static LIST_HEAD(target_list);

​

/* This needs to be a spinlock because write_msg() cannot sleep */

static DEFINE_SPINLOCK(target_list_lock);

​

/*

 * Console driver for extended netconsoles.  Registered on the first use to

 * avoid unnecessarily enabling ext message formatting.

 */

static struct console netconsole_ext;

​

/**

 * struct netconsole_target - Represents a configured netconsole target.

 * @list:   Links this target into the target_list.

 * @item:   Links us into the configfs subsystem hierarchy.

 * @enabled:    On / off knob to enable / disable target.