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59 lines
1.3 KiB
59 lines
1.3 KiB
// 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 <linux/thread_info.h> |
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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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