59 lines
1.3 KiB
C
59 lines
1.3 KiB
C
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// SPDX-License-Identifier: GPL-2.0
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/*
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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 <asm/nmi.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/init.h>
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#include <linux/delay.h>
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#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
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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_cpumask_backtrace
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static void nmi_raise_cpu_backtrace(cpumask_t *mask)
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{
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apic->send_IPI_mask(mask, NMI_VECTOR);
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}
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void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
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{
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nmi_trigger_cpumask_backtrace(mask, exclude_self,
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nmi_raise_cpu_backtrace);
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}
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static int nmi_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
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{
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if (nmi_cpu_backtrace(regs))
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return NMI_HANDLED;
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return NMI_DONE;
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}
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NOKPROBE_SYMBOL(nmi_cpu_backtrace_handler);
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static int __init register_nmi_cpu_backtrace_handler(void)
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{
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register_nmi_handler(NMI_LOCAL, nmi_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_nmi_cpu_backtrace_handler);
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#endif
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