--- /dev/null
+/*
+ * FIXME: add wdrtas_get_status and wdrtas_get_boot_status as soon as
+ * RTAS calls are available
+ */
+
+/*
+ * RTAS watchdog driver
+ *
+ * (C) Copyright IBM Corp. 2005
+ * device driver to exploit watchdog RTAS functions
+ *
+ * Authors : Utz Bacher <utz.bacher@de.ibm.com>
+ *
+ * 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/fs.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/miscdevice.h>
+#include <linux/module.h>
+#include <linux/notifier.h>
+#include <linux/reboot.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <linux/uaccess.h>
+
+#include <asm/rtas.h>
+
+#define WDRTAS_MAGIC_CHAR 42
+#define WDRTAS_SUPPORTED_MASK (WDIOF_SETTIMEOUT | \
+ WDIOF_MAGICCLOSE)
+
+MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>");
+MODULE_DESCRIPTION("RTAS watchdog driver");
+MODULE_LICENSE("GPL");
+
+static bool wdrtas_nowayout = WATCHDOG_NOWAYOUT;
+static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0);
+static char wdrtas_expect_close;
+
+static int wdrtas_interval;
+
+#define WDRTAS_THERMAL_SENSOR 3
+static int wdrtas_token_get_sensor_state;
+#define WDRTAS_SURVEILLANCE_IND 9000
+static int wdrtas_token_set_indicator;
+#define WDRTAS_SP_SPI 28
+static int wdrtas_token_get_sp;
+static int wdrtas_token_event_scan;
+
+#define WDRTAS_DEFAULT_INTERVAL 300
+
+#define WDRTAS_LOGBUFFER_LEN 128
+static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN];
+
+
+/*** watchdog access functions */
+
+/**
+ * wdrtas_set_interval - sets the watchdog interval
+ * @interval: new interval
+ *
+ * returns 0 on success, <0 on failures
+ *
+ * wdrtas_set_interval sets the watchdog keepalive interval by calling the
+ * RTAS function set-indicator (surveillance). The unit of interval is
+ * seconds.
+ */
+
+static int wdrtas_set_interval(int interval)
+{
+ long result;
+ static int print_msg = 10;
+
+ /* rtas uses minutes */
+ interval = (interval + 59) / 60;
+
+ result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL,
+ WDRTAS_SURVEILLANCE_IND, 0, interval);
+ if (result < 0 && print_msg) {
+ pr_err("setting the watchdog to %i timeout failed: %li\n",
+ interval, result);
+ print_msg--;
+ }
+
+ return result;
+}
+
+#define WDRTAS_SP_SPI_LEN 4
+
+/**
+ * wdrtas_get_interval - returns the current watchdog interval
+ * @fallback_value: value (in seconds) to use, if the RTAS call fails
+ *
+ * returns the interval
+ *
+ * wdrtas_get_interval returns the current watchdog keepalive interval
+ * as reported by the RTAS function ibm,get-system-parameter. The unit
+ * of the return value is seconds.
+ */
+static int wdrtas_get_interval(int fallback_value)
+{
+ long result;
+ char value[WDRTAS_SP_SPI_LEN];
+
+ spin_lock(&rtas_data_buf_lock);
+ memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN);
+ result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL,
+ WDRTAS_SP_SPI, __pa(rtas_data_buf),
+ WDRTAS_SP_SPI_LEN);
+
+ memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN);
+ spin_unlock(&rtas_data_buf_lock);
+
+ if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) {
+ pr_warn("could not get sp_spi watchdog timeout (%li). Continuing\n",
+ result);
+ return fallback_value;
+ }
+
+ /* rtas uses minutes */
+ return ((int)value[2]) * 60;
+}
+
+/**
+ * wdrtas_timer_start - starts watchdog
+ *
+ * wdrtas_timer_start starts the watchdog by calling the RTAS function
+ * set-interval (surveillance)
+ */
+static void wdrtas_timer_start(void)
+{
+ wdrtas_set_interval(wdrtas_interval);
+}
+
+/**
+ * wdrtas_timer_stop - stops watchdog
+ *
+ * wdrtas_timer_stop stops the watchdog timer by calling the RTAS function
+ * set-interval (surveillance)
+ */
+static void wdrtas_timer_stop(void)
+{
+ wdrtas_set_interval(0);
+}
+
+/**
+ * wdrtas_timer_keepalive - resets watchdog timer to keep system alive
+ *
+ * wdrtas_timer_keepalive restarts the watchdog timer by calling the
+ * RTAS function event-scan and repeats these calls as long as there are
+ * events available. All events will be dumped.
+ */
+static void wdrtas_timer_keepalive(void)
+{
+ long result;
+
+ do {
+ result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL,
+ RTAS_EVENT_SCAN_ALL_EVENTS, 0,
+ (void *)__pa(wdrtas_logbuffer),
+ WDRTAS_LOGBUFFER_LEN);
+ if (result < 0)
+ pr_err("event-scan failed: %li\n", result);
+ if (result == 0)
+ print_hex_dump(KERN_INFO, "dumping event, data: ",
+ DUMP_PREFIX_OFFSET, 16, 1,
+ wdrtas_logbuffer, WDRTAS_LOGBUFFER_LEN, false);
+ } while (result == 0);
+}
+
+/**
+ * wdrtas_get_temperature - returns current temperature
+ *
+ * returns temperature or <0 on failures
+ *
+ * wdrtas_get_temperature returns the current temperature in Fahrenheit. It
+ * uses the RTAS call get-sensor-state, token 3 to do so
+ */
+static int wdrtas_get_temperature(void)
+{
+ int result;
+ int temperature = 0;
+
+ result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature);
+
+ if (result < 0)
+ pr_warn("reading the thermal sensor failed: %i\n", result);
+ else
+ temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */
+
+ return temperature;
+}
+
+/**
+ * wdrtas_get_status - returns the status of the watchdog
+ *
+ * returns a bitmask of defines WDIOF_... as defined in
+ * include/linux/watchdog.h
+ */
+static int wdrtas_get_status(void)
+{
+ return 0; /* TODO */
+}
+
+/**
+ * wdrtas_get_boot_status - returns the reason for the last boot
+ *
+ * returns a bitmask of defines WDIOF_... as defined in
+ * include/linux/watchdog.h, indicating why the watchdog rebooted the system
+ */
+static int wdrtas_get_boot_status(void)
+{
+ return 0; /* TODO */
+}
+
+/*** watchdog API and operations stuff */
+
+/* wdrtas_write - called when watchdog device is written to
+ * @file: file structure
+ * @buf: user buffer with data
+ * @len: amount to data written
+ * @ppos: position in file
+ *
+ * returns the number of successfully processed characters, which is always
+ * the number of bytes passed to this function
+ *
+ * wdrtas_write processes all the data given to it and looks for the magic
+ * character 'V'. This character allows the watchdog device to be closed
+ * properly.
+ */
+static ssize_t wdrtas_write(struct file *file, const char __user *buf,
+ size_t len, loff_t *ppos)
+{
+ int i;
+ char c;
+
+ if (!len)
+ goto out;
+
+ if (!wdrtas_nowayout) {
+ wdrtas_expect_close = 0;
+ /* look for 'V' */
+ for (i = 0; i < len; i++) {
+ if (get_user(c, buf + i))
+ return -EFAULT;
+ /* allow to close device */
+ if (c == 'V')
+ wdrtas_expect_close = WDRTAS_MAGIC_CHAR;
+ }
+ }
+
+ wdrtas_timer_keepalive();
+
+out:
+ return len;
+}
+
+/**
+ * wdrtas_ioctl - ioctl function for the watchdog device
+ * @file: file structure
+ * @cmd: command for ioctl
+ * @arg: argument pointer
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * wdrtas_ioctl implements the watchdog API ioctls
+ */
+
+static long wdrtas_ioctl(struct file *file, unsigned int cmd,
+ unsigned long arg)
+{
+ int __user *argp = (void __user *)arg;
+ int i;
+ static const struct watchdog_info wdinfo = {
+ .options = WDRTAS_SUPPORTED_MASK,
+ .firmware_version = 0,
+ .identity = "wdrtas",
+ };
+
+ switch (cmd) {
+ case WDIOC_GETSUPPORT:
+ if (copy_to_user(argp, &wdinfo, sizeof(wdinfo)))
+ return -EFAULT;
+ return 0;
+
+ case WDIOC_GETSTATUS:
+ i = wdrtas_get_status();
+ return put_user(i, argp);
+
+ case WDIOC_GETBOOTSTATUS:
+ i = wdrtas_get_boot_status();
+ return put_user(i, argp);
+
+ case WDIOC_GETTEMP:
+ if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE)
+ return -EOPNOTSUPP;
+
+ i = wdrtas_get_temperature();
+ return put_user(i, argp);
+
+ case WDIOC_SETOPTIONS:
+ if (get_user(i, argp))
+ return -EFAULT;
+ if (i & WDIOS_DISABLECARD)
+ wdrtas_timer_stop();
+ if (i & WDIOS_ENABLECARD) {
+ wdrtas_timer_keepalive();
+ wdrtas_timer_start();
+ }
+ /* not implemented. Done by H8
+ if (i & WDIOS_TEMPPANIC) {
+ } */
+ return 0;
+
+ case WDIOC_KEEPALIVE:
+ wdrtas_timer_keepalive();
+ return 0;
+
+ case WDIOC_SETTIMEOUT:
+ if (get_user(i, argp))
+ return -EFAULT;
+
+ if (wdrtas_set_interval(i))
+ return -EINVAL;
+
+ wdrtas_timer_keepalive();
+
+ if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE)
+ wdrtas_interval = i;
+ else
+ wdrtas_interval = wdrtas_get_interval(i);
+ /* fallthrough */
+
+ case WDIOC_GETTIMEOUT:
+ return put_user(wdrtas_interval, argp);
+
+ default:
+ return -ENOTTY;
+ }
+}
+
+/**
+ * wdrtas_open - open function of watchdog device
+ * @inode: inode structure
+ * @file: file structure
+ *
+ * returns 0 on success, -EBUSY if the file has been opened already, <0 on
+ * other failures
+ *
+ * function called when watchdog device is opened
+ */
+static int wdrtas_open(struct inode *inode, struct file *file)
+{
+ /* only open once */
+ if (atomic_inc_return(&wdrtas_miscdev_open) > 1) {
+ atomic_dec(&wdrtas_miscdev_open);
+ return -EBUSY;
+ }
+
+ wdrtas_timer_start();
+ wdrtas_timer_keepalive();
+
+ return nonseekable_open(inode, file);
+}
+
+/**
+ * wdrtas_close - close function of watchdog device
+ * @inode: inode structure
+ * @file: file structure
+ *
+ * returns 0 on success
+ *
+ * close function. Always succeeds
+ */
+static int wdrtas_close(struct inode *inode, struct file *file)
+{
+ /* only stop watchdog, if this was announced using 'V' before */
+ if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR)
+ wdrtas_timer_stop();
+ else {
+ pr_warn("got unexpected close. Watchdog not stopped.\n");
+ wdrtas_timer_keepalive();
+ }
+
+ wdrtas_expect_close = 0;
+ atomic_dec(&wdrtas_miscdev_open);
+ return 0;
+}
+
+/**
+ * wdrtas_temp_read - gives back the temperature in fahrenheit
+ * @file: file structure
+ * @buf: user buffer
+ * @count: number of bytes to be read
+ * @ppos: position in file
+ *
+ * returns always 1 or -EFAULT in case of user space copy failures, <0 on
+ * other failures
+ *
+ * wdrtas_temp_read gives the temperature to the users by copying this
+ * value as one byte into the user space buffer. The unit is Fahrenheit...
+ */
+static ssize_t wdrtas_temp_read(struct file *file, char __user *buf,
+ size_t count, loff_t *ppos)
+{
+ int temperature = 0;
+
+ temperature = wdrtas_get_temperature();
+ if (temperature < 0)
+ return temperature;
+
+ if (copy_to_user(buf, &temperature, 1))
+ return -EFAULT;
+
+ return 1;
+}
+
+/**
+ * wdrtas_temp_open - open function of temperature device
+ * @inode: inode structure
+ * @file: file structure
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * function called when temperature device is opened
+ */
+static int wdrtas_temp_open(struct inode *inode, struct file *file)
+{
+ return nonseekable_open(inode, file);
+}
+
+/**
+ * wdrtas_temp_close - close function of temperature device
+ * @inode: inode structure
+ * @file: file structure
+ *
+ * returns 0 on success
+ *
+ * close function. Always succeeds
+ */
+static int wdrtas_temp_close(struct inode *inode, struct file *file)
+{
+ return 0;
+}
+
+/**
+ * wdrtas_reboot - reboot notifier function
+ * @nb: notifier block structure
+ * @code: reboot code
+ * @ptr: unused
+ *
+ * returns NOTIFY_DONE
+ *
+ * wdrtas_reboot stops the watchdog in case of a reboot
+ */
+static int wdrtas_reboot(struct notifier_block *this,
+ unsigned long code, void *ptr)
+{
+ if (code == SYS_DOWN || code == SYS_HALT)
+ wdrtas_timer_stop();
+
+ return NOTIFY_DONE;
+}
+
+/*** initialization stuff */
+
+static const struct file_operations wdrtas_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .write = wdrtas_write,
+ .unlocked_ioctl = wdrtas_ioctl,
+ .open = wdrtas_open,
+ .release = wdrtas_close,
+};
+
+static struct miscdevice wdrtas_miscdev = {
+ .minor = WATCHDOG_MINOR,
+ .name = "watchdog",
+ .fops = &wdrtas_fops,
+};
+
+static const struct file_operations wdrtas_temp_fops = {
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = wdrtas_temp_read,
+ .open = wdrtas_temp_open,
+ .release = wdrtas_temp_close,
+};
+
+static struct miscdevice wdrtas_tempdev = {
+ .minor = TEMP_MINOR,
+ .name = "temperature",
+ .fops = &wdrtas_temp_fops,
+};
+
+static struct notifier_block wdrtas_notifier = {
+ .notifier_call = wdrtas_reboot,
+};
+
+/**
+ * wdrtas_get_tokens - reads in RTAS tokens
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * wdrtas_get_tokens reads in the tokens for the RTAS calls used in
+ * this watchdog driver. It tolerates, if "get-sensor-state" and
+ * "ibm,get-system-parameter" are not available.
+ */
+static int wdrtas_get_tokens(void)
+{
+ wdrtas_token_get_sensor_state = rtas_token("get-sensor-state");
+ if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE) {
+ pr_warn("couldn't get token for get-sensor-state. Trying to continue without temperature support.\n");
+ }
+
+ wdrtas_token_get_sp = rtas_token("ibm,get-system-parameter");
+ if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE) {
+ pr_warn("couldn't get token for ibm,get-system-parameter. Trying to continue with a default timeout value of %i seconds.\n",
+ WDRTAS_DEFAULT_INTERVAL);
+ }
+
+ wdrtas_token_set_indicator = rtas_token("set-indicator");
+ if (wdrtas_token_set_indicator == RTAS_UNKNOWN_SERVICE) {
+ pr_err("couldn't get token for set-indicator. Terminating watchdog code.\n");
+ return -EIO;
+ }
+
+ wdrtas_token_event_scan = rtas_token("event-scan");
+ if (wdrtas_token_event_scan == RTAS_UNKNOWN_SERVICE) {
+ pr_err("couldn't get token for event-scan. Terminating watchdog code.\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
+/**
+ * wdrtas_unregister_devs - unregisters the misc dev handlers
+ *
+ * wdrtas_register_devs unregisters the watchdog and temperature watchdog
+ * misc devs
+ */
+static void wdrtas_unregister_devs(void)
+{
+ misc_deregister(&wdrtas_miscdev);
+ if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE)
+ misc_deregister(&wdrtas_tempdev);
+}
+
+/**
+ * wdrtas_register_devs - registers the misc dev handlers
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * wdrtas_register_devs registers the watchdog and temperature watchdog
+ * misc devs
+ */
+static int wdrtas_register_devs(void)
+{
+ int result;
+
+ result = misc_register(&wdrtas_miscdev);
+ if (result) {
+ pr_err("couldn't register watchdog misc device. Terminating watchdog code.\n");
+ return result;
+ }
+
+ if (wdrtas_token_get_sensor_state != RTAS_UNKNOWN_SERVICE) {
+ result = misc_register(&wdrtas_tempdev);
+ if (result) {
+ pr_warn("couldn't register watchdog temperature misc device. Continuing without temperature support.\n");
+ wdrtas_token_get_sensor_state = RTAS_UNKNOWN_SERVICE;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * wdrtas_init - init function of the watchdog driver
+ *
+ * returns 0 on success, <0 on failure
+ *
+ * registers the file handlers and the reboot notifier
+ */
+static int __init wdrtas_init(void)
+{
+ if (wdrtas_get_tokens())
+ return -ENODEV;
+
+ if (wdrtas_register_devs())
+ return -ENODEV;
+
+ if (register_reboot_notifier(&wdrtas_notifier)) {
+ pr_err("could not register reboot notifier. Terminating watchdog code.\n");
+ wdrtas_unregister_devs();
+ return -ENODEV;
+ }
+
+ if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE)
+ wdrtas_interval = WDRTAS_DEFAULT_INTERVAL;
+ else
+ wdrtas_interval = wdrtas_get_interval(WDRTAS_DEFAULT_INTERVAL);
+
+ return 0;
+}
+
+/**
+ * wdrtas_exit - exit function of the watchdog driver
+ *
+ * unregisters the file handlers and the reboot notifier
+ */
+static void __exit wdrtas_exit(void)
+{
+ if (!wdrtas_nowayout)
+ wdrtas_timer_stop();
+
+ wdrtas_unregister_devs();
+
+ unregister_reboot_notifier(&wdrtas_notifier);
+}
+
+module_init(wdrtas_init);
+module_exit(wdrtas_exit);
Code Review / kvmfornfv.git / blobdiff