diff options
Diffstat (limited to 'ANDROID_3.4.5/arch/sparc/kernel/nmi.c')
| -rw-r--r-- | ANDROID_3.4.5/arch/sparc/kernel/nmi.c | 285 |
1 files changed, 0 insertions, 285 deletions
diff --git a/ANDROID_3.4.5/arch/sparc/kernel/nmi.c b/ANDROID_3.4.5/arch/sparc/kernel/nmi.c deleted file mode 100644 index eb1c1f01..00000000 --- a/ANDROID_3.4.5/arch/sparc/kernel/nmi.c +++ /dev/null @@ -1,285 +0,0 @@ -/* Pseudo NMI support on sparc64 systems. - * - * Copyright (C) 2009 David S. Miller <davem@davemloft.net> - * - * The NMI watchdog support and infrastructure is based almost - * entirely upon the x86 NMI support code. - */ -#include <linux/kernel.h> -#include <linux/param.h> -#include <linux/init.h> -#include <linux/percpu.h> -#include <linux/nmi.h> -#include <linux/export.h> -#include <linux/kprobes.h> -#include <linux/kernel_stat.h> -#include <linux/reboot.h> -#include <linux/slab.h> -#include <linux/kdebug.h> -#include <linux/delay.h> -#include <linux/smp.h> - -#include <asm/perf_event.h> -#include <asm/ptrace.h> -#include <asm/pcr.h> -#include <asm/perfctr.h> - -#include "kstack.h" - -/* We don't have a real NMI on sparc64, but we can fake one - * up using profiling counter overflow interrupts and interrupt - * levels. - * - * The profile overflow interrupts at level 15, so we use - * level 14 as our IRQ off level. - */ - -static int panic_on_timeout; - -/* nmi_active: - * >0: the NMI watchdog is active, but can be disabled - * <0: the NMI watchdog has not been set up, and cannot be enabled - * 0: the NMI watchdog is disabled, but can be enabled - */ -atomic_t nmi_active = ATOMIC_INIT(0); /* oprofile uses this */ -EXPORT_SYMBOL(nmi_active); - -static unsigned int nmi_hz = HZ; -static DEFINE_PER_CPU(short, wd_enabled); -static int endflag __initdata; - -static DEFINE_PER_CPU(unsigned int, last_irq_sum); -static DEFINE_PER_CPU(long, alert_counter); -static DEFINE_PER_CPU(int, nmi_touch); - -void touch_nmi_watchdog(void) -{ - if (atomic_read(&nmi_active)) { - int cpu; - - for_each_present_cpu(cpu) { - if (per_cpu(nmi_touch, cpu) != 1) - per_cpu(nmi_touch, cpu) = 1; - } - } - - touch_softlockup_watchdog(); -} -EXPORT_SYMBOL(touch_nmi_watchdog); - -static void die_nmi(const char *str, struct pt_regs *regs, int do_panic) -{ - if (notify_die(DIE_NMIWATCHDOG, str, regs, 0, - pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP) - return; - - console_verbose(); - bust_spinlocks(1); - - printk(KERN_EMERG "%s", str); - printk(" on CPU%d, ip %08lx, registers:\n", - smp_processor_id(), regs->tpc); - show_regs(regs); - dump_stack(); - - bust_spinlocks(0); - - if (do_panic || panic_on_oops) - panic("Non maskable interrupt"); - - nmi_exit(); - local_irq_enable(); - do_exit(SIGBUS); -} - -notrace __kprobes void perfctr_irq(int irq, struct pt_regs *regs) -{ - unsigned int sum, touched = 0; - void *orig_sp; - - clear_softint(1 << irq); - - local_cpu_data().__nmi_count++; - - nmi_enter(); - - orig_sp = set_hardirq_stack(); - - if (notify_die(DIE_NMI, "nmi", regs, 0, - pt_regs_trap_type(regs), SIGINT) == NOTIFY_STOP) - touched = 1; - else - pcr_ops->write(PCR_PIC_PRIV); - - sum = local_cpu_data().irq0_irqs; - if (__get_cpu_var(nmi_touch)) { - __get_cpu_var(nmi_touch) = 0; - touched = 1; - } - if (!touched && __get_cpu_var(last_irq_sum) == sum) { - __this_cpu_inc(alert_counter); - if (__this_cpu_read(alert_counter) == 30 * nmi_hz) - die_nmi("BUG: NMI Watchdog detected LOCKUP", - regs, panic_on_timeout); - } else { - __get_cpu_var(last_irq_sum) = sum; - __this_cpu_write(alert_counter, 0); - } - if (__get_cpu_var(wd_enabled)) { - write_pic(picl_value(nmi_hz)); - pcr_ops->write(pcr_enable); - } - - restore_hardirq_stack(orig_sp); - - nmi_exit(); -} - -static inline unsigned int get_nmi_count(int cpu) -{ - return cpu_data(cpu).__nmi_count; -} - -static __init void nmi_cpu_busy(void *data) -{ - local_irq_enable_in_hardirq(); - while (endflag == 0) - mb(); -} - -static void report_broken_nmi(int cpu, int *prev_nmi_count) -{ - printk(KERN_CONT "\n"); - - printk(KERN_WARNING - "WARNING: CPU#%d: NMI appears to be stuck (%d->%d)!\n", - cpu, prev_nmi_count[cpu], get_nmi_count(cpu)); - - printk(KERN_WARNING - "Please report this to bugzilla.kernel.org,\n"); - printk(KERN_WARNING - "and attach the output of the 'dmesg' command.\n"); - - per_cpu(wd_enabled, cpu) = 0; - atomic_dec(&nmi_active); -} - -void stop_nmi_watchdog(void *unused) -{ - pcr_ops->write(PCR_PIC_PRIV); - __get_cpu_var(wd_enabled) = 0; - atomic_dec(&nmi_active); -} - -static int __init check_nmi_watchdog(void) -{ - unsigned int *prev_nmi_count; - int cpu, err; - - if (!atomic_read(&nmi_active)) - return 0; - - prev_nmi_count = kmalloc(nr_cpu_ids * sizeof(unsigned int), GFP_KERNEL); - if (!prev_nmi_count) { - err = -ENOMEM; - goto error; - } - - printk(KERN_INFO "Testing NMI watchdog ... "); - - smp_call_function(nmi_cpu_busy, (void *)&endflag, 0); - - for_each_possible_cpu(cpu) - prev_nmi_count[cpu] = get_nmi_count(cpu); - local_irq_enable(); - mdelay((20 * 1000) / nmi_hz); /* wait 20 ticks */ - - for_each_online_cpu(cpu) { - if (!per_cpu(wd_enabled, cpu)) - continue; - if (get_nmi_count(cpu) - prev_nmi_count[cpu] <= 5) - report_broken_nmi(cpu, prev_nmi_count); - } - endflag = 1; - if (!atomic_read(&nmi_active)) { - kfree(prev_nmi_count); - atomic_set(&nmi_active, -1); - err = -ENODEV; - goto error; - } - printk("OK.\n"); - - nmi_hz = 1; - - kfree(prev_nmi_count); - return 0; -error: - on_each_cpu(stop_nmi_watchdog, NULL, 1); - return err; -} - -void start_nmi_watchdog(void *unused) -{ - __get_cpu_var(wd_enabled) = 1; - atomic_inc(&nmi_active); - - pcr_ops->write(PCR_PIC_PRIV); - write_pic(picl_value(nmi_hz)); - - pcr_ops->write(pcr_enable); -} - -static void nmi_adjust_hz_one(void *unused) -{ - if (!__get_cpu_var(wd_enabled)) - return; - - pcr_ops->write(PCR_PIC_PRIV); - write_pic(picl_value(nmi_hz)); - - pcr_ops->write(pcr_enable); -} - -void nmi_adjust_hz(unsigned int new_hz) -{ - nmi_hz = new_hz; - on_each_cpu(nmi_adjust_hz_one, NULL, 1); -} -EXPORT_SYMBOL_GPL(nmi_adjust_hz); - -static int nmi_shutdown(struct notifier_block *nb, unsigned long cmd, void *p) -{ - on_each_cpu(stop_nmi_watchdog, NULL, 1); - return 0; -} - -static struct notifier_block nmi_reboot_notifier = { - .notifier_call = nmi_shutdown, -}; - -int __init nmi_init(void) -{ - int err; - - on_each_cpu(start_nmi_watchdog, NULL, 1); - - err = check_nmi_watchdog(); - if (!err) { - err = register_reboot_notifier(&nmi_reboot_notifier); - if (err) { - on_each_cpu(stop_nmi_watchdog, NULL, 1); - atomic_set(&nmi_active, -1); - } - } - - return err; -} - -static int __init setup_nmi_watchdog(char *str) -{ - if (!strncmp(str, "panic", 5)) - panic_on_timeout = 1; - - return 0; -} -__setup("nmi_watchdog=", setup_nmi_watchdog); |