![David Howells](/assets/img/avatar_default.png)
Maintain a per-CPU global "struct pt_regs *" variable which can be used instead of passing regs around manually through all ~1800 interrupt handlers in the Linux kernel. The regs pointer is used in few places, but it potentially costs both stack space and code to pass it around. On the FRV arch, removing the regs parameter from all the genirq function results in a 20% speed up of the IRQ exit path (ie: from leaving timer_interrupt() to leaving do_IRQ()). Where appropriate, an arch may override the generic storage facility and do something different with the variable. On FRV, for instance, the address is maintained in GR28 at all times inside the kernel as part of general exception handling. Having looked over the code, it appears that the parameter may be handed down through up to twenty or so layers of functions. Consider a USB character device attached to a USB hub, attached to a USB controller that posts its interrupts through a cascaded auxiliary interrupt controller. A character device driver may want to pass regs to the sysrq handler through the input layer which adds another few layers of parameter passing. I've build this code with allyesconfig for x86_64 and i386. I've runtested the main part of the code on FRV and i386, though I can't test most of the drivers. I've also done partial conversion for powerpc and MIPS - these at least compile with minimal configurations. This will affect all archs. Mostly the changes should be relatively easy. Take do_IRQ(), store the regs pointer at the beginning, saving the old one: struct pt_regs *old_regs = set_irq_regs(regs); And put the old one back at the end: set_irq_regs(old_regs); Don't pass regs through to generic_handle_irq() or __do_IRQ(). In timer_interrupt(), this sort of change will be necessary: - update_process_times(user_mode(regs)); - profile_tick(CPU_PROFILING, regs); + update_process_times(user_mode(get_irq_regs())); + profile_tick(CPU_PROFILING); I'd like to move update_process_times()'s use of get_irq_regs() into itself, except that i386, alone of the archs, uses something other than user_mode(). Some notes on the interrupt handling in the drivers: (*) input_dev() is now gone entirely. The regs pointer is no longer stored in the input_dev struct. (*) finish_unlinks() in drivers/usb/host/ohci-q.c needs checking. It does something different depending on whether it's been supplied with a regs pointer or not. (*) Various IRQ handler function pointers have been moved to type irq_handler_t. Signed-Off-By: David Howells <dhowells@redhat.com> (cherry picked from 1b16e7ac850969f38b375e511e3fa2f474a33867 commit)
641 lines
15 KiB
C
641 lines
15 KiB
C
/*
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* Industrial Computer Source WDT500/501 driver
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*
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* (c) Copyright 1996-1997 Alan Cox <alan@redhat.com>, All Rights Reserved.
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* http://www.redhat.com
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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 cleanup
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* Parameterized timeout
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* Tigran Aivazian : Restructured wdt_init() to handle 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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#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 <asm/io.h>
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#include <asm/uaccess.h>
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#include <asm/system.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, "Watchdog heartbeat in seconds. (0<heartbeat<65536, default=" __MODULE_STRING(WD_TIMO) ")");
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static int nowayout = WATCHDOG_NOWAYOUT;
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module_param(nowayout, int, 0);
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MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=CONFIG_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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module_param(io, int, 0);
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MODULE_PARM_DESC(io, "WDT io port (default=0x240)");
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module_param(irq, int, 0);
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MODULE_PARM_DESC(irq, "WDT irq (default=11)");
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#ifdef CONFIG_WDT_501
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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, "WDT501-P Fan Tachometer support (0=disable, default=0)");
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#endif /* CONFIG_WDT_501 */
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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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inb_p(WDT_DC); /* Disable watchdog */
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wdt_ctr_mode(0,3); /* Program CTR0 for Mode 3: Square Wave Generator */
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wdt_ctr_mode(1,2); /* Program CTR1 for Mode 2: Rate Generator */
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wdt_ctr_mode(2,0); /* Program CTR2 for Mode 0: 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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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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/* 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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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 reloading
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* the cascade counter.
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*/
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static int wdt_ping(void)
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{
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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: 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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return 0;
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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 value is
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* incorrect we keep the old value and return -EINVAL. If successfull we
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* 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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* @status: the new 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(int *status)
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{
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unsigned char new_status=inb_p(WDT_SR);
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*status=0;
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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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#ifdef CONFIG_WDT_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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#endif /* CONFIG_WDT_501 */
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return 0;
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}
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#ifdef CONFIG_WDT_501
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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(int *temperature)
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{
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unsigned short c=inb_p(WDT_RT);
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*temperature = (c * 11 / 15) + 7;
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return 0;
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}
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#endif /* CONFIG_WDT_501 */
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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=inb_p(WDT_SR);
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printk(KERN_CRIT "WDT status %d\n", status);
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#ifdef CONFIG_WDT_501
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if (!(status & WDC_SR_TGOOD))
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printk(KERN_CRIT "Overheat alarm.(%d)\n",inb_p(WDT_RT));
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if (!(status & WDC_SR_PSUOVER))
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printk(KERN_CRIT "PSU over voltage.\n");
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if (!(status & WDC_SR_PSUUNDR))
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printk(KERN_CRIT "PSU under voltage.\n");
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if (tachometer) {
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if (!(status & WDC_SR_FANGOOD))
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printk(KERN_CRIT "Possible fan fault.\n");
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}
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#endif /* CONFIG_WDT_501 */
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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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printk(KERN_CRIT "Would Reboot.\n");
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#else
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printk(KERN_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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printk(KERN_CRIT "Reset in 5ms.\n");
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#endif
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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, 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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* @inode: inode of the device
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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 int wdt_ioctl(struct inode *inode, struct file *file, unsigned int cmd,
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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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static 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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#ifdef CONFIG_WDT_501
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ident.options |= (WDIOF_OVERHEAT|WDIOF_POWERUNDER|WDIOF_POWEROVER);
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if (tachometer)
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ident.options |= WDIOF_FANFAULT;
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#endif /* CONFIG_WDT_501 */
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switch(cmd)
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{
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default:
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return -ENOTTY;
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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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wdt_get_status(&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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}
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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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printk(KERN_CRIT "wdt: 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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#ifdef CONFIG_WDT_501
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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, size_t count, loff_t *ptr)
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{
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int temperature;
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if (wdt_get_temperature(&temperature))
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return -EFAULT;
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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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#endif /* CONFIG_WDT_501 */
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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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/* Turn the card off */
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wdt_stop();
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}
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return NOTIFY_DONE;
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}
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/*
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* Kernel Interfaces
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*/
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|
|
|
|
|
static const struct file_operations wdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = wdt_write,
|
|
.ioctl = wdt_ioctl,
|
|
.open = wdt_open,
|
|
.release = wdt_release,
|
|
};
|
|
|
|
static struct miscdevice wdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &wdt_fops,
|
|
};
|
|
|
|
#ifdef CONFIG_WDT_501
|
|
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,
|
|
};
|
|
#endif /* CONFIG_WDT_501 */
|
|
|
|
/*
|
|
* 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);
|
|
#ifdef CONFIG_WDT_501
|
|
misc_deregister(&temp_miscdev);
|
|
#endif /* CONFIG_WDT_501 */
|
|
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;
|
|
|
|
/* 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);
|
|
printk(KERN_INFO "wdt: heartbeat value must be 0<heartbeat<65536, using %d\n",
|
|
WD_TIMO);
|
|
}
|
|
|
|
if (!request_region(io, 8, "wdt501p")) {
|
|
printk(KERN_ERR "wdt: I/O address 0x%04x already in use\n", io);
|
|
ret = -EBUSY;
|
|
goto out;
|
|
}
|
|
|
|
ret = request_irq(irq, wdt_interrupt, IRQF_DISABLED, "wdt501p", NULL);
|
|
if(ret) {
|
|
printk(KERN_ERR "wdt: IRQ %d is not free.\n", irq);
|
|
goto outreg;
|
|
}
|
|
|
|
ret = register_reboot_notifier(&wdt_notifier);
|
|
if(ret) {
|
|
printk(KERN_ERR "wdt: cannot register reboot notifier (err=%d)\n", ret);
|
|
goto outirq;
|
|
}
|
|
|
|
#ifdef CONFIG_WDT_501
|
|
ret = misc_register(&temp_miscdev);
|
|
if (ret) {
|
|
printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n",
|
|
TEMP_MINOR, ret);
|
|
goto outrbt;
|
|
}
|
|
#endif /* CONFIG_WDT_501 */
|
|
|
|
ret = misc_register(&wdt_miscdev);
|
|
if (ret) {
|
|
printk(KERN_ERR "wdt: cannot register miscdev on minor=%d (err=%d)\n",
|
|
WATCHDOG_MINOR, ret);
|
|
goto outmisc;
|
|
}
|
|
|
|
ret = 0;
|
|
printk(KERN_INFO "WDT500/501-P driver 0.10 at 0x%04x (Interrupt %d). heartbeat=%d sec (nowayout=%d)\n",
|
|
io, irq, heartbeat, nowayout);
|
|
#ifdef CONFIG_WDT_501
|
|
printk(KERN_INFO "wdt: Fan Tachometer is %s\n", (tachometer ? "Enabled" : "Disabled"));
|
|
#endif /* CONFIG_WDT_501 */
|
|
|
|
out:
|
|
return ret;
|
|
|
|
outmisc:
|
|
#ifdef CONFIG_WDT_501
|
|
misc_deregister(&temp_miscdev);
|
|
outrbt:
|
|
#endif /* CONFIG_WDT_501 */
|
|
unregister_reboot_notifier(&wdt_notifier);
|
|
outirq:
|
|
free_irq(irq, NULL);
|
|
outreg:
|
|
release_region(io,8);
|
|
goto out;
|
|
}
|
|
|
|
module_init(wdt_init);
|
|
module_exit(wdt_exit);
|
|
|
|
MODULE_AUTHOR("Alan Cox");
|
|
MODULE_DESCRIPTION("Driver for ISA ICS watchdog cards (WDT500/501)");
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
MODULE_ALIAS_MISCDEV(TEMP_MINOR);
|
|
MODULE_LICENSE("GPL");
|