diff options
Diffstat (limited to 'arch/mn10300/kernel/mn10300-watchdog.c')
| -rw-r--r-- | arch/mn10300/kernel/mn10300-watchdog.c | 205 |
1 files changed, 0 insertions, 205 deletions
diff --git a/arch/mn10300/kernel/mn10300-watchdog.c b/arch/mn10300/kernel/mn10300-watchdog.c deleted file mode 100644 index 0d5641beadf5..000000000000 --- a/arch/mn10300/kernel/mn10300-watchdog.c +++ /dev/null @@ -1,205 +0,0 @@ -/* MN10300 Watchdog timer - * - * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved. - * Written by David Howells (dhowells@redhat.com) - * - Derived from arch/i386/kernel/nmi.c - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public Licence - * as published by the Free Software Foundation; either version - * 2 of the Licence, or (at your option) any later version. - */ -#include <linux/module.h> -#include <linux/sched.h> -#include <linux/kernel.h> -#include <linux/init.h> -#include <linux/delay.h> -#include <linux/interrupt.h> -#include <linux/kernel_stat.h> -#include <linux/nmi.h> -#include <asm/processor.h> -#include <linux/atomic.h> -#include <asm/intctl-regs.h> -#include <asm/rtc-regs.h> -#include <asm/div64.h> -#include <asm/smp.h> -#include <asm/gdb-stub.h> -#include <proc/clock.h> - -static DEFINE_SPINLOCK(watchdog_print_lock); -static unsigned int watchdog; -static unsigned int watchdog_hz = 1; -unsigned int watchdog_alert_counter[NR_CPUS]; - -EXPORT_SYMBOL(arch_touch_nmi_watchdog); - -/* - * the best way to detect whether a CPU has a 'hard lockup' problem - * is to check its timer makes IRQ counts. If they are not - * changing then that CPU has some problem. - * - * since NMIs dont listen to _any_ locks, we have to be extremely - * careful not to rely on unsafe variables. The printk might lock - * up though, so we have to break up any console locks first ... - * [when there will be more tty-related locks, break them up - * here too!] - */ -static unsigned int last_irq_sums[NR_CPUS]; - -int __init check_watchdog(void) -{ - irq_cpustat_t tmp[1]; - - printk(KERN_INFO "Testing Watchdog... "); - - memcpy(tmp, irq_stat, sizeof(tmp)); - local_irq_enable(); - mdelay((10 * 1000) / watchdog_hz); /* wait 10 ticks */ - local_irq_disable(); - - if (nmi_count(0) - tmp[0].__nmi_count <= 5) { - printk(KERN_WARNING "CPU#%d: Watchdog appears to be stuck!\n", - 0); - return -1; - } - - printk(KERN_INFO "OK.\n"); - - /* now that we know it works we can reduce NMI frequency to something - * more reasonable; makes a difference in some configs - */ - watchdog_hz = 1; - - return 0; -} - -static int __init setup_watchdog(char *str) -{ - unsigned tmp; - int opt; - u8 ctr; - - get_option(&str, &opt); - if (opt != 1) - return 0; - - watchdog = opt; - if (watchdog) { - set_intr_stub(EXCEP_WDT, watchdog_handler); - ctr = WDCTR_WDCK_65536th; - WDCTR = WDCTR_WDRST | ctr; - WDCTR = ctr; - tmp = WDCTR; - - tmp = __muldiv64u(1 << (16 + ctr * 2), 1000000, MN10300_WDCLK); - tmp = 1000000000 / tmp; - watchdog_hz = (tmp + 500) / 1000; - } - - return 1; -} - -__setup("watchdog=", setup_watchdog); - -void __init watchdog_go(void) -{ - u8 wdt; - - if (watchdog) { - printk(KERN_INFO "Watchdog: running at %uHz\n", watchdog_hz); - wdt = WDCTR & ~WDCTR_WDCNE; - WDCTR = wdt | WDCTR_WDRST; - wdt = WDCTR; - WDCTR = wdt | WDCTR_WDCNE; - wdt = WDCTR; - - check_watchdog(); - } -} - -#ifdef CONFIG_SMP -static void watchdog_dump_register(void *dummy) -{ - printk(KERN_ERR "--- Register Dump (CPU%d) ---\n", CPUID); - show_registers(current_frame()); -} -#endif - -asmlinkage -void watchdog_interrupt(struct pt_regs *regs, enum exception_code excep) -{ - /* - * Since current-> is always on the stack, and we always switch - * the stack NMI-atomically, it's safe to use smp_processor_id(). - */ - int sum, cpu; - int irq = NMIIRQ; - u8 wdt, tmp; - - wdt = WDCTR & ~WDCTR_WDCNE; - WDCTR = wdt; - tmp = WDCTR; - NMICR = NMICR_WDIF; - - nmi_count(smp_processor_id())++; - kstat_incr_irq_this_cpu(irq); - - for_each_online_cpu(cpu) { - - sum = irq_stat[cpu].__irq_count; - - if ((last_irq_sums[cpu] == sum) -#if defined(CONFIG_GDBSTUB) && defined(CONFIG_SMP) - && !(CHK_GDBSTUB_BUSY() - || atomic_read(&cpu_doing_single_step)) -#endif - ) { - /* - * Ayiee, looks like this CPU is stuck ... - * wait a few IRQs (5 seconds) before doing the oops ... - */ - watchdog_alert_counter[cpu]++; - if (watchdog_alert_counter[cpu] == 5 * watchdog_hz) { - spin_lock(&watchdog_print_lock); - /* - * We are in trouble anyway, lets at least try - * to get a message out. - */ - bust_spinlocks(1); - printk(KERN_ERR - "NMI Watchdog detected LOCKUP on CPU%d," - " pc %08lx, registers:\n", - cpu, regs->pc); -#ifdef CONFIG_SMP - printk(KERN_ERR - "--- Register Dump (CPU%d) ---\n", - CPUID); -#endif - show_registers(regs); -#ifdef CONFIG_SMP - smp_nmi_call_function(watchdog_dump_register, - NULL, 1); -#endif - printk(KERN_NOTICE "console shuts up ...\n"); - console_silent(); - spin_unlock(&watchdog_print_lock); - bust_spinlocks(0); -#ifdef CONFIG_GDBSTUB - if (CHK_GDBSTUB_BUSY_AND_ACTIVE()) - gdbstub_exception(regs, excep); - else - gdbstub_intercept(regs, excep); -#endif - do_exit(SIGSEGV); - } - } else { - last_irq_sums[cpu] = sum; - watchdog_alert_counter[cpu] = 0; - } - } - - WDCTR = wdt | WDCTR_WDRST; - tmp = WDCTR; - WDCTR = wdt | WDCTR_WDCNE; - tmp = WDCTR; -} |