summaryrefslogtreecommitdiffstats
path: root/ansible/roles/download_pmu_tools
diff options
context:
space:
mode:
Diffstat (limited to 'ansible/roles/download_pmu_tools')
0 files changed, 0 insertions, 0 deletions
' href='#n100'>100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 
/*
 *	IndyDog	0.3	A Hardware Watchdog Device for SGI IP22
 *
 *	(c) Copyright 2002 Guido Guenther <agx@sigxcpu.org>,
 *						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.
 *
 *	based on softdog.c by Alan Cox <alan@lxorguk.ukuu.org.uk>
 */

#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/miscdevice.h>
#include <linux/watchdog.h>
#include <linux/notifier.h>
#include <linux/reboot.h>
#include <linux/init.h>
#include <linux/uaccess.h>
#include <asm/sgi/mc.h>

static unsigned long indydog_alive;
static DEFINE_SPINLOCK(indydog_lock);

#define WATCHDOG_TIMEOUT 30		/* 30 sec default timeout */

static bool nowayout = WATCHDOG_NOWAYOUT;
module_param(nowayout, bool, 0);
MODULE_PARM_DESC(nowayout,
		"Watchdog cannot be stopped once started (default="
				__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");

static void indydog_start(void)
{
	spin_lock(&indydog_lock);
	sgimc->cpuctrl0 |= SGIMC_CCTRL0_WDOG;
	spin_unlock(&indydog_lock);
}

static void indydog_stop(void)
{
	spin_lock(&indydog_lock);
	sgimc->cpuctrl0 &= ~SGIMC_CCTRL0_WDOG;
	spin_unlock(&indydog_lock);

	pr_info("Stopped watchdog timer\n");
}

static void indydog_ping(void)
{
	sgimc->watchdogt = 0;
}

/*
 *	Allow only one person to hold it open
 */
static int indydog_open(struct inode *inode, struct file *file)
{
	if (test_and_set_bit(0, &indydog_alive))
		return -EBUSY;

	if (nowayout)
		__module_get(THIS_MODULE);

	/* Activate timer */
	indydog_start();
	indydog_ping();

	pr_info("Started watchdog timer\n");

	return nonseekable_open(inode, file);
}

static int indydog_release(struct inode *inode, struct file *file)
{
	/* Shut off the timer.
	 * Lock it in if it's a module and we defined ...NOWAYOUT */
	if (!nowayout)
		indydog_stop();		/* Turn the WDT off */
	clear_bit(0, &indydog_alive);
	return 0;
}

static ssize_t indydog_write(struct file *file, const char *data,
						size_t len, loff_t *ppos)
{
	/* Refresh the timer. */
	if (len)
		indydog_ping();
	return len;
}

static long indydog_ioctl(struct file *file, unsigned int cmd,
							unsigned long arg)
{
	int options, retval = -EINVAL;
	static const struct watchdog_info ident = {
		.options		= WDIOF_KEEPALIVEPING,
		.firmware_version	= 0,
		.identity		= "Hardware Watchdog for SGI IP22",
	};

	switch (cmd) {
	case WDIOC_GETSUPPORT:
		if (copy_to_user((struct watchdog_info *)arg,
				 &ident, sizeof(ident)))
			return -EFAULT;
		return 0;
	case WDIOC_GETSTATUS:
	case WDIOC_GETBOOTSTATUS:
		return put_user(0, (int *)arg);
	case WDIOC_SETOPTIONS:
	{
		if (get_user(options, (int *)arg))
			return -EFAULT;
		if (options & WDIOS_DISABLECARD) {
			indydog_stop();
			retval = 0;
		}
		if (options & WDIOS_ENABLECARD) {
			indydog_start();
			retval = 0;
		}
		return retval;
	}
	case WDIOC_KEEPALIVE:
		indydog_ping();
		return 0;
	case WDIOC_GETTIMEOUT:
		return put_user(WATCHDOG_TIMEOUT, (int *)arg);
	default:
		return -ENOTTY;
	}
}

static int indydog_notify_sys(struct notifier_block *this,
					unsigned long code, void *unused)
{
	if (code == SYS_DOWN || code == SYS_HALT)
		indydog_stop();		/* Turn the WDT off */

	return NOTIFY_DONE;
}

static const struct file_operations indydog_fops = {
	.owner		= THIS_MODULE,
	.llseek		= no_llseek,
	.write		= indydog_write,
	.unlocked_ioctl	= indydog_ioctl,
	.open		= indydog_open,
	.release	= indydog_release,
};

static struct miscdevice indydog_miscdev = {
	.minor		= WATCHDOG_MINOR,
	.name		= "watchdog",
	.fops		= &indydog_fops,
};

static struct notifier_block indydog_notifier = {
	.notifier_call = indydog_notify_sys,
};

static int __init watchdog_init(void)
{
	int ret;

	ret = register_reboot_notifier(&indydog_notifier);
	if (ret) {
		pr_err("cannot register reboot notifier (err=%d)\n", ret);
		return ret;
	}

	ret = misc_register(&indydog_miscdev);
	if (ret) {
		pr_err("cannot register miscdev on minor=%d (err=%d)\n",
		       WATCHDOG_MINOR, ret);
		unregister_reboot_notifier(&indydog_notifier);
		return ret;
	}

	pr_info("Hardware Watchdog Timer for SGI IP22: 0.3\n");

	return 0;
}

static void __exit watchdog_exit(void)
{
	misc_deregister(&indydog_miscdev);
	unregister_reboot_notifier(&indydog_notifier);
}

module_init(watchdog_init);
module_exit(watchdog_exit);

MODULE_AUTHOR("Guido Guenther <agx@sigxcpu.org>");
MODULE_DESCRIPTION("Hardware Watchdog Device for SGI IP22");
MODULE_LICENSE("GPL");