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Linux/arch/x86/kernel/apic/hw_nmi.c

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  1 /*
  2  *  HW NMI watchdog support
  3  *
  4  *  started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
  5  *
  6  *  Arch specific calls to support NMI watchdog
  7  *
  8  *  Bits copied from original nmi.c file
  9  *
 10  */
 11 #include <asm/apic.h>
 12 #include <asm/nmi.h>
 13 
 14 #include <linux/cpumask.h>
 15 #include <linux/kdebug.h>
 16 #include <linux/notifier.h>
 17 #include <linux/kprobes.h>
 18 #include <linux/nmi.h>
 19 #include <linux/module.h>
 20 #include <linux/delay.h>
 21 
 22 #ifdef CONFIG_HARDLOCKUP_DETECTOR
 23 u64 hw_nmi_get_sample_period(int watchdog_thresh)
 24 {
 25         return (u64)(cpu_khz) * 1000 * watchdog_thresh;
 26 }
 27 #endif
 28 
 29 #ifdef arch_trigger_all_cpu_backtrace
 30 /* For reliability, we're prepared to waste bits here. */
 31 static DECLARE_BITMAP(backtrace_mask, NR_CPUS) __read_mostly;
 32 
 33 /* "in progress" flag of arch_trigger_all_cpu_backtrace */
 34 static unsigned long backtrace_flag;
 35 
 36 void arch_trigger_all_cpu_backtrace(void)
 37 {
 38         int i;
 39 
 40         if (test_and_set_bit(0, &backtrace_flag))
 41                 /*
 42                  * If there is already a trigger_all_cpu_backtrace() in progress
 43                  * (backtrace_flag == 1), don't output double cpu dump infos.
 44                  */
 45                 return;
 46 
 47         cpumask_copy(to_cpumask(backtrace_mask), cpu_online_mask);
 48 
 49         printk(KERN_INFO "sending NMI to all CPUs:\n");
 50         apic->send_IPI_all(NMI_VECTOR);
 51 
 52         /* Wait for up to 10 seconds for all CPUs to do the backtrace */
 53         for (i = 0; i < 10 * 1000; i++) {
 54                 if (cpumask_empty(to_cpumask(backtrace_mask)))
 55                         break;
 56                 mdelay(1);
 57         }
 58 
 59         clear_bit(0, &backtrace_flag);
 60         smp_mb__after_clear_bit();
 61 }
 62 
 63 static int __kprobes
 64 arch_trigger_all_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
 65 {
 66         int cpu;
 67 
 68         cpu = smp_processor_id();
 69 
 70         if (cpumask_test_cpu(cpu, to_cpumask(backtrace_mask))) {
 71                 static arch_spinlock_t lock = __ARCH_SPIN_LOCK_UNLOCKED;
 72 
 73                 arch_spin_lock(&lock);
 74                 printk(KERN_WARNING "NMI backtrace for cpu %d\n", cpu);
 75                 show_regs(regs);
 76                 arch_spin_unlock(&lock);
 77                 cpumask_clear_cpu(cpu, to_cpumask(backtrace_mask));
 78                 return NMI_HANDLED;
 79         }
 80 
 81         return NMI_DONE;
 82 }
 83 
 84 static int __init register_trigger_all_cpu_backtrace(void)
 85 {
 86         register_nmi_handler(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler,
 87                                 0, "arch_bt");
 88         return 0;
 89 }
 90 early_initcall(register_trigger_all_cpu_backtrace);
 91 #endif
 92 

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