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![David Howells](/assets/img/avatar_default.png)
When the kernel is running in secure boot mode, we lock down the kernel to prevent userspace from modifying the running kernel image. Whilst this includes prohibiting access to things like /dev/mem, it must also prevent access by means of configuring driver modules in such a way as to cause a device to access or modify the kernel image. To this end, annotate module_param* statements that refer to hardware configuration and indicate for future reference what type of parameter they specify. The parameter parser in the core sees this information and can skip such parameters with an error message if the kernel is locked down. The module initialisation then runs as normal, but just sees whatever the default values for those parameters is. Note that we do still need to do the module initialisation because some drivers have viable defaults set in case parameters aren't specified and some drivers support automatic configuration (e.g. PNP or PCI) in addition to manually coded parameters. This patch annotates drivers in drivers/watchdog/. Suggested-by: Alan Cox <gnomes@lxorguk.ukuu.org.uk> Signed-off-by: David Howells <dhowells@redhat.com> Reviewed-by: Guenter Roeck <linux@roeck-us.net> cc: Wim Van Sebroeck <wim@iguana.be> cc: Zwane Mwaikambo <zwanem@gmail.com> cc: linux-watchdog@vger.kernel.org
667 lines
16 KiB
C
667 lines
16 KiB
C
/*
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* Industrial Computer Source WDT501 driver
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*
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* (c) Copyright 1996-1997 Alan Cox <alan@lxorguk.ukuu.org.uk>,
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*
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* Neither Alan Cox nor CymruNet Ltd. admit liability nor provide
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* warranty for any of this software. This material is provided
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* "AS-IS" and at no charge.
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*
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* (c) Copyright 1995 Alan Cox <alan@lxorguk.ukuu.org.uk>
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*
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* Release 0.10.
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*
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* Fixes
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* Dave Gregorich : Modularisation and minor bugs
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* Alan Cox : Added the watchdog ioctl() stuff
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* Alan Cox : Fixed the reboot problem (as noted by
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* Matt Crocker).
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* Alan Cox : Added wdt= boot option
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* Alan Cox : Cleaned up copy/user stuff
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* Tim Hockin : Added insmod parameters, comment
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* cleanup, parameterized timeout
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* Tigran Aivazian : Restructured wdt_init() to handle
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* failures
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* Joel Becker : Added WDIOC_GET/SETTIMEOUT
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* Matt Domsch : Added nowayout module option
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/interrupt.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/types.h>
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#include <linux/miscdevice.h>
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#include <linux/watchdog.h>
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#include <linux/fs.h>
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#include <linux/ioport.h>
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#include <linux/notifier.h>
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#include <linux/reboot.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/uaccess.h>
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#include "wd501p.h"
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static unsigned long wdt_is_open;
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static char expect_close;
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/*
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* Module parameters
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*/
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#define WD_TIMO 60 /* Default heartbeat = 60 seconds */
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static int heartbeat = WD_TIMO;
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static int wd_heartbeat;
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module_param(heartbeat, int, 0);
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MODULE_PARM_DESC(heartbeat,
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"Watchdog heartbeat in seconds. (0 < heartbeat < 65536, default="
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__MODULE_STRING(WD_TIMO) ")");
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static bool nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, bool, 0);
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MODULE_PARM_DESC(nowayout,
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"Watchdog cannot be stopped once started (default="
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__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
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/* You must set these - there is no sane way to probe for this board. */
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static int io = 0x240;
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static int irq = 11;
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static DEFINE_SPINLOCK(wdt_lock);
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module_param_hw(io, int, ioport, 0);
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MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
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module_param_hw(irq, int, irq, 0);
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MODULE_PARM_DESC(irq, "WDT irq (default=11)");
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/* Support for the Fan Tachometer on the WDT501-P */
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static int tachometer;
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module_param(tachometer, int, 0);
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MODULE_PARM_DESC(tachometer,
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"WDT501-P Fan Tachometer support (0=disable, default=0)");
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static int type = 500;
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module_param(type, int, 0);
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MODULE_PARM_DESC(type,
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"WDT501-P Card type (500 or 501, default=500)");
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/*
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* Programming support
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*/
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static void wdt_ctr_mode(int ctr, int mode)
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{
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ctr <<= 6;
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ctr |= 0x30;
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ctr |= (mode << 1);
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outb_p(ctr, WDT_CR);
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}
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static void wdt_ctr_load(int ctr, int val)
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{
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outb_p(val&0xFF, WDT_COUNT0+ctr);
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outb_p(val>>8, WDT_COUNT0+ctr);
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}
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/**
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* wdt_start:
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*
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* Start the watchdog driver.
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*/
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static int wdt_start(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdt_lock, flags);
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inb_p(WDT_DC); /* Disable watchdog */
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wdt_ctr_mode(0, 3); /* Program CTR0 for Mode 3:
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Square Wave Generator */
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wdt_ctr_mode(1, 2); /* Program CTR1 for Mode 2:
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Rate Generator */
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wdt_ctr_mode(2, 0); /* Program CTR2 for Mode 0:
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Pulse on Terminal Count */
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wdt_ctr_load(0, 8948); /* Count at 100Hz */
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wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */
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wdt_ctr_load(2, 65535); /* Length of reset pulse */
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outb_p(0, WDT_DC); /* Enable watchdog */
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spin_unlock_irqrestore(&wdt_lock, flags);
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return 0;
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}
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/**
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* wdt_stop:
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*
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* Stop the watchdog driver.
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*/
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static int wdt_stop(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdt_lock, flags);
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/* Turn the card off */
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inb_p(WDT_DC); /* Disable watchdog */
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wdt_ctr_load(2, 0); /* 0 length reset pulses now */
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spin_unlock_irqrestore(&wdt_lock, flags);
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return 0;
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}
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/**
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* wdt_ping:
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*
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* Reload counter one with the watchdog heartbeat. We don't bother
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* reloading the cascade counter.
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*/
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static void wdt_ping(void)
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{
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unsigned long flags;
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spin_lock_irqsave(&wdt_lock, flags);
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/* Write a watchdog value */
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inb_p(WDT_DC); /* Disable watchdog */
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wdt_ctr_mode(1, 2); /* Re-Program CTR1 for Mode 2:
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Rate Generator */
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wdt_ctr_load(1, wd_heartbeat); /* Heartbeat */
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outb_p(0, WDT_DC); /* Enable watchdog */
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spin_unlock_irqrestore(&wdt_lock, flags);
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}
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/**
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* wdt_set_heartbeat:
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* @t: the new heartbeat value that needs to be set.
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*
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* Set a new heartbeat value for the watchdog device. If the heartbeat
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* value is incorrect we keep the old value and return -EINVAL. If
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* successful we return 0.
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*/
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static int wdt_set_heartbeat(int t)
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{
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if (t < 1 || t > 65535)
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return -EINVAL;
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heartbeat = t;
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wd_heartbeat = t * 100;
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return 0;
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}
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/**
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* wdt_get_status:
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*
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* Extract the status information from a WDT watchdog device. There are
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* several board variants so we have to know which bits are valid. Some
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* bits default to one and some to zero in order to be maximally painful.
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*
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* we then map the bits onto the status ioctl flags.
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*/
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static int wdt_get_status(void)
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{
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unsigned char new_status;
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int status = 0;
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unsigned long flags;
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spin_lock_irqsave(&wdt_lock, flags);
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new_status = inb_p(WDT_SR);
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spin_unlock_irqrestore(&wdt_lock, flags);
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if (new_status & WDC_SR_ISOI0)
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status |= WDIOF_EXTERN1;
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if (new_status & WDC_SR_ISII1)
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status |= WDIOF_EXTERN2;
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if (type == 501) {
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if (!(new_status & WDC_SR_TGOOD))
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status |= WDIOF_OVERHEAT;
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if (!(new_status & WDC_SR_PSUOVER))
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status |= WDIOF_POWEROVER;
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if (!(new_status & WDC_SR_PSUUNDR))
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status |= WDIOF_POWERUNDER;
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if (tachometer) {
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if (!(new_status & WDC_SR_FANGOOD))
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status |= WDIOF_FANFAULT;
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}
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}
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return status;
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}
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/**
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* wdt_get_temperature:
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*
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* Reports the temperature in degrees Fahrenheit. The API is in
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* farenheit. It was designed by an imperial measurement luddite.
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*/
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static int wdt_get_temperature(void)
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{
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unsigned short c;
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unsigned long flags;
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spin_lock_irqsave(&wdt_lock, flags);
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c = inb_p(WDT_RT);
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spin_unlock_irqrestore(&wdt_lock, flags);
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return (c * 11 / 15) + 7;
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}
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static void wdt_decode_501(int status)
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{
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if (!(status & WDC_SR_TGOOD))
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pr_crit("Overheat alarm (%d)\n", inb_p(WDT_RT));
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if (!(status & WDC_SR_PSUOVER))
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pr_crit("PSU over voltage\n");
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if (!(status & WDC_SR_PSUUNDR))
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pr_crit("PSU under voltage\n");
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}
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/**
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* wdt_interrupt:
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* @irq: Interrupt number
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* @dev_id: Unused as we don't allow multiple devices.
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*
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* Handle an interrupt from the board. These are raised when the status
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* map changes in what the board considers an interesting way. That means
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* a failure condition occurring.
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*/
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static irqreturn_t wdt_interrupt(int irq, void *dev_id)
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{
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/*
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* Read the status register see what is up and
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* then printk it.
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*/
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unsigned char status;
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spin_lock(&wdt_lock);
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status = inb_p(WDT_SR);
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pr_crit("WDT status %d\n", status);
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if (type == 501) {
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wdt_decode_501(status);
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if (tachometer) {
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if (!(status & WDC_SR_FANGOOD))
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pr_crit("Possible fan fault\n");
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}
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}
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if (!(status & WDC_SR_WCCR)) {
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#ifdef SOFTWARE_REBOOT
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#ifdef ONLY_TESTING
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pr_crit("Would Reboot\n");
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#else
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pr_crit("Initiating system reboot\n");
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emergency_restart();
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#endif
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#else
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pr_crit("Reset in 5ms\n");
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#endif
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}
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spin_unlock(&wdt_lock);
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return IRQ_HANDLED;
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}
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/**
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* wdt_write:
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* @file: file handle to the watchdog
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* @buf: buffer to write (unused as data does not matter here
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* @count: count of bytes
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* @ppos: pointer to the position to write. No seeks allowed
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*
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* A write to a watchdog device is defined as a keepalive signal. Any
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* write of data will do, as we we don't define content meaning.
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*/
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static ssize_t wdt_write(struct file *file, const char __user *buf,
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size_t count, loff_t *ppos)
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{
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if (count) {
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if (!nowayout) {
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size_t i;
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/* In case it was set long ago */
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expect_close = 0;
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for (i = 0; i != count; i++) {
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char c;
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if (get_user(c, buf + i))
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return -EFAULT;
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if (c == 'V')
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expect_close = 42;
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}
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}
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wdt_ping();
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}
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return count;
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}
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/**
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* wdt_ioctl:
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* @file: file handle to the device
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* @cmd: watchdog command
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* @arg: argument pointer
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*
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* The watchdog API defines a common set of functions for all watchdogs
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* according to their available features. We only actually usefully support
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* querying capabilities and current status.
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*/
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static long wdt_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
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{
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void __user *argp = (void __user *)arg;
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int __user *p = argp;
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int new_heartbeat;
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int status;
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struct watchdog_info ident = {
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.options = WDIOF_SETTIMEOUT|
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WDIOF_MAGICCLOSE|
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WDIOF_KEEPALIVEPING,
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.firmware_version = 1,
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.identity = "WDT500/501",
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};
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/* Add options according to the card we have */
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ident.options |= (WDIOF_EXTERN1|WDIOF_EXTERN2);
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if (type == 501) {
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ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|
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WDIOF_POWEROVER);
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if (tachometer)
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ident.options |= WDIOF_FANFAULT;
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}
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switch (cmd) {
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case WDIOC_GETSUPPORT:
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return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
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case WDIOC_GETSTATUS:
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status = wdt_get_status();
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return put_user(status, p);
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case WDIOC_GETBOOTSTATUS:
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return put_user(0, p);
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case WDIOC_KEEPALIVE:
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wdt_ping();
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return 0;
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case WDIOC_SETTIMEOUT:
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if (get_user(new_heartbeat, p))
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return -EFAULT;
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if (wdt_set_heartbeat(new_heartbeat))
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return -EINVAL;
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wdt_ping();
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/* Fall */
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case WDIOC_GETTIMEOUT:
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return put_user(heartbeat, p);
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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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* wdt_open:
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* @inode: inode of device
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* @file: file handle to device
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*
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* The watchdog device has been opened. The watchdog device is single
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* open and on opening we load the counters. Counter zero is a 100Hz
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* cascade, into counter 1 which downcounts to reboot. When the counter
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* triggers counter 2 downcounts the length of the reset pulse which
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* set set to be as long as possible.
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*/
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static int wdt_open(struct inode *inode, struct file *file)
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{
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if (test_and_set_bit(0, &wdt_is_open))
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return -EBUSY;
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/*
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* Activate
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*/
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wdt_start();
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return nonseekable_open(inode, file);
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}
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/**
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* wdt_release:
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* @inode: inode to board
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* @file: file handle to board
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*
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* The watchdog has a configurable API. There is a religious dispute
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* between people who want their watchdog to be able to shut down and
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* those who want to be sure if the watchdog manager dies the machine
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* reboots. In the former case we disable the counters, in the latter
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* case you have to open it again very soon.
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*/
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static int wdt_release(struct inode *inode, struct file *file)
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{
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if (expect_close == 42) {
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wdt_stop();
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clear_bit(0, &wdt_is_open);
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} else {
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pr_crit("WDT device closed unexpectedly. WDT will not stop!\n");
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wdt_ping();
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}
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expect_close = 0;
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return 0;
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}
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/**
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* wdt_temp_read:
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* @file: file handle to the watchdog board
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* @buf: buffer to write 1 byte into
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* @count: length of buffer
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* @ptr: offset (no seek allowed)
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*
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* Temp_read reports the temperature in degrees Fahrenheit. The API is in
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* farenheit. It was designed by an imperial measurement luddite.
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*/
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static ssize_t wdt_temp_read(struct file *file, char __user *buf,
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size_t count, loff_t *ptr)
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{
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int temperature = wdt_get_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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* wdt_temp_open:
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* @inode: inode of device
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* @file: file handle to device
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*
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* The temperature device has been opened.
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*/
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static int wdt_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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* wdt_temp_release:
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* @inode: inode to board
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* @file: file handle to board
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*
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* The temperature device has been closed.
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*/
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static int wdt_temp_release(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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* notify_sys:
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* @this: our notifier block
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* @code: the event being reported
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* @unused: unused
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*
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* Our notifier is called on system shutdowns. We want to turn the card
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* off at reboot otherwise the machine will reboot again during memory
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* test or worse yet during the following fsck. This would suck, in fact
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* trust me - if it happens it does suck.
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*/
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static int wdt_notify_sys(struct notifier_block *this, unsigned long code,
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void *unused)
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{
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if (code == SYS_DOWN || code == SYS_HALT)
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wdt_stop();
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return NOTIFY_DONE;
|
|
}
|
|
|
|
/*
|
|
* Kernel Interfaces
|
|
*/
|
|
|
|
|
|
static const struct file_operations wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = wdt_write,
|
|
.unlocked_ioctl = wdt_ioctl,
|
|
.open = wdt_open,
|
|
.release = wdt_release,
|
|
};
|
|
|
|
static struct miscdevice wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &wdt_fops,
|
|
};
|
|
|
|
static const struct file_operations wdt_temp_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.read = wdt_temp_read,
|
|
.open = wdt_temp_open,
|
|
.release = wdt_temp_release,
|
|
};
|
|
|
|
static struct miscdevice temp_miscdev = {
|
|
.minor = TEMP_MINOR,
|
|
.name = "temperature",
|
|
.fops = &wdt_temp_fops,
|
|
};
|
|
|
|
/*
|
|
* The WDT card needs to learn about soft shutdowns in order to
|
|
* turn the timebomb registers off.
|
|
*/
|
|
|
|
static struct notifier_block wdt_notifier = {
|
|
.notifier_call = wdt_notify_sys,
|
|
};
|
|
|
|
/**
|
|
* cleanup_module:
|
|
*
|
|
* Unload the watchdog. You cannot do this with any file handles open.
|
|
* If your watchdog is set to continue ticking on close and you unload
|
|
* it, well it keeps ticking. We won't get the interrupt but the board
|
|
* will not touch PC memory so all is fine. You just have to load a new
|
|
* module in 60 seconds or reboot.
|
|
*/
|
|
|
|
static void __exit wdt_exit(void)
|
|
{
|
|
misc_deregister(&wdt_miscdev);
|
|
if (type == 501)
|
|
misc_deregister(&temp_miscdev);
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
free_irq(irq, NULL);
|
|
release_region(io, 8);
|
|
}
|
|
|
|
/**
|
|
* wdt_init:
|
|
*
|
|
* Set up the WDT watchdog board. All we have to do is grab the
|
|
* resources we require and bitch if anyone beat us to them.
|
|
* The open() function will actually kick the board off.
|
|
*/
|
|
|
|
static int __init wdt_init(void)
|
|
{
|
|
int ret;
|
|
|
|
if (type != 500 && type != 501) {
|
|
pr_err("unknown card type '%d'\n", type);
|
|
return -ENODEV;
|
|
}
|
|
|
|
/* Check that the heartbeat value is within it's range;
|
|
if not reset to the default */
|
|
if (wdt_set_heartbeat(heartbeat)) {
|
|
wdt_set_heartbeat(WD_TIMO);
|
|
pr_info("heartbeat value must be 0 < heartbeat < 65536, using %d\n",
|
|
WD_TIMO);
|
|
}
|
|
|
|
if (!request_region(io, 8, "wdt501p")) {
|
|
pr_err("I/O address 0x%04x already in use\n", io);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ret = request_irq(irq, wdt_interrupt, 0, "wdt501p", NULL);
|
|
if (ret) {
|
|
pr_err("IRQ %d is not free\n", irq);
|
|
goto outreg;
|
|
}
|
|
|
|
ret = register_reboot_notifier(&wdt_notifier);
|
|
if (ret) {
|
|
pr_err("cannot register reboot notifier (err=%d)\n", ret);
|
|
goto outirq;
|
|
}
|
|
|
|
if (type == 501) {
|
|
ret = misc_register(&temp_miscdev);
|
|
if (ret) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
TEMP_MINOR, ret);
|
|
goto outrbt;
|
|
}
|
|
}
|
|
|
|
ret = misc_register(&wdt_miscdev);
|
|
if (ret) {
|
|
pr_err("cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, ret);
|
|
goto outmisc;
|
|
}
|
|
|
|
pr_info("WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",
|
|
io, irq, heartbeat, nowayout);
|
|
if (type == 501)
|
|
pr_info("Fan Tachometer is %s\n",
|
|
tachometer ? "Enabled" : "Disabled");
|
|
return 0;
|
|
|
|
outmisc:
|
|
if (type == 501)
|
|
misc_deregister(&temp_miscdev);
|
|
outrbt:
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
outirq:
|
|
free_irq(irq, NULL);
|
|
outreg:
|
|
release_region(io, 8);
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
module_init(wdt_init);
|
|
module_exit(wdt_exit);
|
|
|
|
MODULE_AUTHOR("Alan Cox");
|
|
MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)");
|
|
MODULE_LICENSE("GPL");
|