mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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42747d712d
make the watchdog_info struct const where possible. Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
677 lines
17 KiB
C
677 lines
17 KiB
C
/*
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* FIXME: add wdrtas_get_status and wdrtas_get_boot_status as soon as
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* RTAS calls are available
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*/
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/*
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* RTAS watchdog driver
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*
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* (C) Copyright IBM Corp. 2005
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* device driver to exploit watchdog RTAS functions
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*
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* Authors : Utz Bacher <utz.bacher@de.ibm.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2, or (at your option)
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* any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/module.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/types.h>
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#include <linux/watchdog.h>
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#include <linux/uaccess.h>
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#include <asm/rtas.h>
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#define WDRTAS_MAGIC_CHAR 42
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#define WDRTAS_SUPPORTED_MASK (WDIOF_SETTIMEOUT | \
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WDIOF_MAGICCLOSE)
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MODULE_AUTHOR("Utz Bacher <utz.bacher@de.ibm.com>");
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MODULE_DESCRIPTION("RTAS watchdog driver");
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MODULE_LICENSE("GPL");
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MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
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MODULE_ALIAS_MISCDEV(TEMP_MINOR);
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static int wdrtas_nowayout = WATCHDOG_NOWAYOUT;
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static atomic_t wdrtas_miscdev_open = ATOMIC_INIT(0);
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static char wdrtas_expect_close;
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static int wdrtas_interval;
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#define WDRTAS_THERMAL_SENSOR 3
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static int wdrtas_token_get_sensor_state;
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#define WDRTAS_SURVEILLANCE_IND 9000
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static int wdrtas_token_set_indicator;
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#define WDRTAS_SP_SPI 28
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static int wdrtas_token_get_sp;
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static int wdrtas_token_event_scan;
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#define WDRTAS_DEFAULT_INTERVAL 300
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#define WDRTAS_LOGBUFFER_LEN 128
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static char wdrtas_logbuffer[WDRTAS_LOGBUFFER_LEN];
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/*** watchdog access functions */
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/**
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* wdrtas_set_interval - sets the watchdog interval
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* @interval: new interval
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*
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* returns 0 on success, <0 on failures
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*
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* wdrtas_set_interval sets the watchdog keepalive interval by calling the
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* RTAS function set-indicator (surveillance). The unit of interval is
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* seconds.
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*/
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static int wdrtas_set_interval(int interval)
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{
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long result;
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static int print_msg = 10;
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/* rtas uses minutes */
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interval = (interval + 59) / 60;
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result = rtas_call(wdrtas_token_set_indicator, 3, 1, NULL,
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WDRTAS_SURVEILLANCE_IND, 0, interval);
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if (result < 0 && print_msg) {
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printk(KERN_ERR "wdrtas: setting the watchdog to %i "
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"timeout failed: %li\n", interval, result);
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print_msg--;
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}
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return result;
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}
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#define WDRTAS_SP_SPI_LEN 4
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/**
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* wdrtas_get_interval - returns the current watchdog interval
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* @fallback_value: value (in seconds) to use, if the RTAS call fails
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*
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* returns the interval
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*
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* wdrtas_get_interval returns the current watchdog keepalive interval
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* as reported by the RTAS function ibm,get-system-parameter. The unit
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* of the return value is seconds.
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*/
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static int wdrtas_get_interval(int fallback_value)
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{
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long result;
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char value[WDRTAS_SP_SPI_LEN];
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spin_lock(&rtas_data_buf_lock);
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memset(rtas_data_buf, 0, WDRTAS_SP_SPI_LEN);
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result = rtas_call(wdrtas_token_get_sp, 3, 1, NULL,
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WDRTAS_SP_SPI, __pa(rtas_data_buf),
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WDRTAS_SP_SPI_LEN);
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memcpy(value, rtas_data_buf, WDRTAS_SP_SPI_LEN);
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spin_unlock(&rtas_data_buf_lock);
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if (value[0] != 0 || value[1] != 2 || value[3] != 0 || result < 0) {
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printk(KERN_WARNING "wdrtas: could not get sp_spi watchdog "
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"timeout (%li). Continuing\n", result);
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return fallback_value;
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}
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/* rtas uses minutes */
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return ((int)value[2]) * 60;
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}
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/**
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* wdrtas_timer_start - starts watchdog
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*
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* wdrtas_timer_start starts the watchdog by calling the RTAS function
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* set-interval (surveillance)
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*/
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static void wdrtas_timer_start(void)
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{
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wdrtas_set_interval(wdrtas_interval);
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}
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/**
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* wdrtas_timer_stop - stops watchdog
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*
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* wdrtas_timer_stop stops the watchdog timer by calling the RTAS function
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* set-interval (surveillance)
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*/
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static void wdrtas_timer_stop(void)
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{
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wdrtas_set_interval(0);
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}
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/**
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* wdrtas_log_scanned_event - logs an event we received during keepalive
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*
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* wdrtas_log_scanned_event prints a message to the log buffer dumping
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* the results of the last event-scan call
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*/
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static void wdrtas_log_scanned_event(void)
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{
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int i;
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for (i = 0; i < WDRTAS_LOGBUFFER_LEN; i += 16)
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printk(KERN_INFO "wdrtas: dumping event (line %i/%i), data = "
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"%02x %02x %02x %02x %02x %02x %02x %02x "
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"%02x %02x %02x %02x %02x %02x %02x %02x\n",
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(i / 16) + 1, (WDRTAS_LOGBUFFER_LEN / 16),
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wdrtas_logbuffer[i + 0], wdrtas_logbuffer[i + 1],
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wdrtas_logbuffer[i + 2], wdrtas_logbuffer[i + 3],
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wdrtas_logbuffer[i + 4], wdrtas_logbuffer[i + 5],
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wdrtas_logbuffer[i + 6], wdrtas_logbuffer[i + 7],
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wdrtas_logbuffer[i + 8], wdrtas_logbuffer[i + 9],
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wdrtas_logbuffer[i + 10], wdrtas_logbuffer[i + 11],
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wdrtas_logbuffer[i + 12], wdrtas_logbuffer[i + 13],
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wdrtas_logbuffer[i + 14], wdrtas_logbuffer[i + 15]);
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}
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/**
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* wdrtas_timer_keepalive - resets watchdog timer to keep system alive
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*
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* wdrtas_timer_keepalive restarts the watchdog timer by calling the
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* RTAS function event-scan and repeats these calls as long as there are
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* events available. All events will be dumped.
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*/
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static void wdrtas_timer_keepalive(void)
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{
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long result;
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do {
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result = rtas_call(wdrtas_token_event_scan, 4, 1, NULL,
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RTAS_EVENT_SCAN_ALL_EVENTS, 0,
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(void *)__pa(wdrtas_logbuffer),
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WDRTAS_LOGBUFFER_LEN);
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if (result < 0)
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printk(KERN_ERR "wdrtas: event-scan failed: %li\n",
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result);
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if (result == 0)
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wdrtas_log_scanned_event();
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} while (result == 0);
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}
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/**
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* wdrtas_get_temperature - returns current temperature
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*
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* returns temperature or <0 on failures
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*
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* wdrtas_get_temperature returns the current temperature in Fahrenheit. It
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* uses the RTAS call get-sensor-state, token 3 to do so
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*/
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static int wdrtas_get_temperature(void)
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{
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int result;
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int temperature = 0;
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result = rtas_get_sensor(WDRTAS_THERMAL_SENSOR, 0, &temperature);
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if (result < 0)
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printk(KERN_WARNING "wdrtas: reading the thermal sensor "
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"failed: %i\n", result);
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else
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temperature = ((temperature * 9) / 5) + 32; /* fahrenheit */
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return temperature;
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}
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/**
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* wdrtas_get_status - returns the status of the watchdog
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*
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* returns a bitmask of defines WDIOF_... as defined in
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* include/linux/watchdog.h
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*/
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static int wdrtas_get_status(void)
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{
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return 0; /* TODO */
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}
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/**
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* wdrtas_get_boot_status - returns the reason for the last boot
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*
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* returns a bitmask of defines WDIOF_... as defined in
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* include/linux/watchdog.h, indicating why the watchdog rebooted the system
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*/
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static int wdrtas_get_boot_status(void)
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{
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return 0; /* TODO */
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}
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/*** watchdog API and operations stuff */
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/* wdrtas_write - called when watchdog device is written to
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* @file: file structure
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* @buf: user buffer with data
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* @len: amount to data written
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* @ppos: position in file
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*
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* returns the number of successfully processed characters, which is always
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* the number of bytes passed to this function
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*
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* wdrtas_write processes all the data given to it and looks for the magic
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* character 'V'. This character allows the watchdog device to be closed
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* properly.
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*/
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static ssize_t wdrtas_write(struct file *file, const char __user *buf,
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size_t len, loff_t *ppos)
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{
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int i;
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char c;
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if (!len)
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goto out;
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if (!wdrtas_nowayout) {
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wdrtas_expect_close = 0;
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/* look for 'V' */
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for (i = 0; i < len; i++) {
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if (get_user(c, buf + i))
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return -EFAULT;
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/* allow to close device */
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if (c == 'V')
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wdrtas_expect_close = WDRTAS_MAGIC_CHAR;
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}
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}
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wdrtas_timer_keepalive();
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out:
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return len;
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}
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/**
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* wdrtas_ioctl - ioctl function for the watchdog device
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* @file: file structure
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* @cmd: command for ioctl
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* @arg: argument pointer
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*
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* returns 0 on success, <0 on failure
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*
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* wdrtas_ioctl implements the watchdog API ioctls
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*/
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static long wdrtas_ioctl(struct file *file, unsigned int cmd,
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unsigned long arg)
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{
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int __user *argp = (void __user *)arg;
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int i;
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static const struct watchdog_info wdinfo = {
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.options = WDRTAS_SUPPORTED_MASK,
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.firmware_version = 0,
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.identity = "wdrtas",
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};
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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if (copy_to_user(argp, &wdinfo, sizeof(wdinfo)))
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return -EFAULT;
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return 0;
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case WDIOC_GETSTATUS:
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i = wdrtas_get_status();
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return put_user(i, argp);
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case WDIOC_GETBOOTSTATUS:
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i = wdrtas_get_boot_status();
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return put_user(i, argp);
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case WDIOC_GETTEMP:
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if (wdrtas_token_get_sensor_state == RTAS_UNKNOWN_SERVICE)
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return -EOPNOTSUPP;
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i = wdrtas_get_temperature();
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return put_user(i, argp);
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case WDIOC_SETOPTIONS:
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if (get_user(i, argp))
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return -EFAULT;
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if (i & WDIOS_DISABLECARD)
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wdrtas_timer_stop();
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if (i & WDIOS_ENABLECARD) {
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wdrtas_timer_keepalive();
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wdrtas_timer_start();
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}
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/* not implemented. Done by H8
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if (i & WDIOS_TEMPPANIC) {
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} */
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return 0;
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case WDIOC_KEEPALIVE:
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wdrtas_timer_keepalive();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(i, argp))
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return -EFAULT;
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if (wdrtas_set_interval(i))
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return -EINVAL;
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wdrtas_timer_keepalive();
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if (wdrtas_token_get_sp == RTAS_UNKNOWN_SERVICE)
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wdrtas_interval = i;
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else
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wdrtas_interval = wdrtas_get_interval(i);
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/* fallthrough */
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case WDIOC_GETTIMEOUT:
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return put_user(wdrtas_interval, argp);
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default:
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return -ENOTTY;
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}
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}
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/**
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* wdrtas_open - open function of watchdog device
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* @inode: inode structure
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* @file: file structure
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*
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* returns 0 on success, -EBUSY if the file has been opened already, <0 on
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* other failures
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*
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* function called when watchdog device is opened
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*/
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static int wdrtas_open(struct inode *inode, struct file *file)
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{
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/* only open once */
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if (atomic_inc_return(&wdrtas_miscdev_open) > 1) {
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atomic_dec(&wdrtas_miscdev_open);
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return -EBUSY;
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}
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wdrtas_timer_start();
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wdrtas_timer_keepalive();
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return nonseekable_open(inode, file);
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}
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/**
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* wdrtas_close - close function of watchdog device
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* @inode: inode structure
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* @file: file structure
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*
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* returns 0 on success
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*
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* close function. Always succeeds
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*/
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static int wdrtas_close(struct inode *inode, struct file *file)
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{
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/* only stop watchdog, if this was announced using 'V' before */
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if (wdrtas_expect_close == WDRTAS_MAGIC_CHAR)
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wdrtas_timer_stop();
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else {
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printk(KERN_WARNING "wdrtas: got unexpected close. Watchdog "
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"not stopped.\n");
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wdrtas_timer_keepalive();
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}
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wdrtas_expect_close = 0;
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atomic_dec(&wdrtas_miscdev_open);
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return 0;
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}
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/**
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* wdrtas_temp_read - gives back the temperature in fahrenheit
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* @file: file structure
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* @buf: user buffer
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* @count: number of bytes to be read
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* @ppos: position in file
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*
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* returns always 1 or -EFAULT in case of user space copy failures, <0 on
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* other failures
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*
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* wdrtas_temp_read gives the temperature to the users by copying this
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* value as one byte into the user space buffer. The unit is Fahrenheit...
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*/
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static ssize_t wdrtas_temp_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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int temperature = 0;
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temperature = wdrtas_get_temperature();
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if (temperature < 0)
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return temperature;
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if (copy_to_user(buf, &temperature, 1))
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return -EFAULT;
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return 1;
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}
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/**
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* wdrtas_temp_open - open function of temperature device
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* @inode: inode structure
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* @file: file structure
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*
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* returns 0 on success, <0 on failure
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*
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* function called when temperature device is opened
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*/
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static int wdrtas_temp_open(struct inode *inode, struct file *file)
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{
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return nonseekable_open(inode, file);
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}
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/**
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* wdrtas_temp_close - close function of temperature device
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* @inode: inode structure
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* @file: file structure
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*
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* returns 0 on success
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*
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* close function. Always succeeds
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*/
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static int wdrtas_temp_close(struct inode *inode, struct file *file)
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{
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return 0;
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}
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/**
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* wdrtas_reboot - reboot notifier function
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* @nb: notifier block structure
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* @code: reboot code
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* @ptr: unused
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*
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* returns NOTIFY_DONE
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*
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* wdrtas_reboot stops the watchdog in case of a reboot
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*/
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static int wdrtas_reboot(struct notifier_block *this,
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unsigned long code, void *ptr)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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wdrtas_timer_stop();
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return NOTIFY_DONE;
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}
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/*** initialization stuff */
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static const struct file_operations wdrtas_fops = {
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.owner = THIS_MODULE,
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.llseek = no_llseek,
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.write = wdrtas_write,
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.unlocked_ioctl = wdrtas_ioctl,
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.open = wdrtas_open,
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.release = wdrtas_close,
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};
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static struct miscdevice wdrtas_miscdev = {
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.minor = WATCHDOG_MINOR,
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.name = "watchdog",
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.fops = &wdrtas_fops,
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};
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static const struct file_operations wdrtas_temp_fops = {
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.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) {
|
|
printk(KERN_WARNING "wdrtas: 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) {
|
|
printk(KERN_WARNING "wdrtas: 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) {
|
|
printk(KERN_ERR "wdrtas: 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) {
|
|
printk(KERN_ERR "wdrtas: 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) {
|
|
printk(KERN_ERR "wdrtas: 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) {
|
|
printk(KERN_WARNING "wdrtas: 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)) {
|
|
printk(KERN_ERR "wdrtas: 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);
|