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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 static void nmi_raise_cpu_backtrace(cpumask_t *mask)
 31 {
 32         apic->send_IPI_mask(mask, NMI_VECTOR);
 33 }
 34 
 35 void arch_trigger_all_cpu_backtrace(bool include_self)
 36 {
 37         nmi_trigger_all_cpu_backtrace(include_self, nmi_raise_cpu_backtrace);
 38 }
 39 
 40 static int
 41 arch_trigger_all_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
 42 {
 43         if (nmi_cpu_backtrace(regs))
 44                 return NMI_HANDLED;
 45 
 46         return NMI_DONE;
 47 }
 48 NOKPROBE_SYMBOL(arch_trigger_all_cpu_backtrace_handler);
 49 
 50 static int __init register_trigger_all_cpu_backtrace(void)
 51 {
 52         register_nmi_handler(NMI_LOCAL, arch_trigger_all_cpu_backtrace_handler,
 53                                 0, "arch_bt");
 54         return 0;
 55 }
 56 early_initcall(register_trigger_all_cpu_backtrace);
 57 #endif
 58 

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