91 lines
2.1 KiB
C
91 lines
2.1 KiB
C
/*
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* HW NMI watchdog support
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*
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* started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
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*
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* Arch specific calls to support NMI watchdog
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*
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* Bits copied from original nmi.c file
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*
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*/
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#include <asm/apic.h>
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#include <linux/cpumask.h>
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#include <linux/kdebug.h>
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#include <linux/notifier.h>
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#include <linux/kprobes.h>
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#include <linux/nmi.h>
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#include <linux/module.h>
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#include <linux/delay.h>
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#ifdef CONFIG_HARDLOCKUP_DETECTOR
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u64 hw_nmi_get_sample_period(int watchdog_thresh)
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{
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return (u64)(cpu_khz) * 1000 * watchdog_thresh;
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}
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#endif
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#ifdef arch_trigger_all_cpu_backtrace
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/* For reliability, we're prepared to waste bits here. */
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static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
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/* "in progress" flag of arch_trigger_all_cpu_backtrace */
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static unsigned long backtrace_flag;
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void arch_trigger_all_cpu_backtrace(void)
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{
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int i;
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if (test_and_set_bit(0, &backtrace_flag))
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/*
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* If there is already a trigger_all_cpu_backtrace() in progress
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* (backtrace_flag == 1), don't output double cpu dump infos.
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*/
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return;
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cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
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printk(KERN_INFO "sending NMI to all CPUs:\n");
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apic->send_IPI_all(NMI_VECTOR);
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/* Wait for up to 10 seconds for all CPUs to do the backtrace */
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for (i = 0; i < 10 * 1000; i++) {
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if (cpumask_empty(to_cpumask(backtrace_mask)))
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break;
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mdelay(1);
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}
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clear_bit(0, &backtrace_flag);
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smp_mb__after_clear_bit();
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}
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static int __kprobes
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arch_trigger_all_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
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{
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int cpu;
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cpu = smp_processor_id();
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if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
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static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
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arch_spin_lock(&lock);
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printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
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show_regs(regs);
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arch_spin_unlock(&lock);
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cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
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return NMI_HANDLED;
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}
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return NMI_DONE;
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}
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static int __init register_trigger_all_cpu_backtrace(void)
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{
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register_nmi_handler(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler,
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0, "arch_bt");
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return 0;
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}
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early_initcall(register_trigger_all_cpu_backtrace);
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#endif
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