cachepc-linux

Fork of AMDESE/linux with modifications for CachePC side-channel attack
git clone https://git.sinitax.com/sinitax/cachepc-linux
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hw_nmi.c (1353B)

      1// SPDX-License-Identifier: GPL-2.0
      2/*
      3 *  HW NMI watchdog support
      4 *
      5 *  started by Don Zickus, Copyright (C) 2010 Red Hat, Inc.
      6 *
      7 *  Arch specific calls to support NMI watchdog
      8 *
      9 *  Bits copied from original nmi.c file
     10 *
     11 */
     12#include <linux/thread_info.h>
     13#include <asm/apic.h>
     14#include <asm/nmi.h>
     15
     16#include <linux/cpumask.h>
     17#include <linux/kdebug.h>
     18#include <linux/notifier.h>
     19#include <linux/kprobes.h>
     20#include <linux/nmi.h>
     21#include <linux/init.h>
     22#include <linux/delay.h>
     23
     24#ifdef CONFIG_HARDLOCKUP_DETECTOR_PERF
     25u64 hw_nmi_get_sample_period(int watchdog_thresh)
     26{
     27	return (u64)(cpu_khz) * 1000 * watchdog_thresh;
     28}
     29#endif
     30
     31#ifdef arch_trigger_cpumask_backtrace
     32static void nmi_raise_cpu_backtrace(cpumask_t *mask)
     33{
     34	apic->send_IPI_mask(mask, NMI_VECTOR);
     35}
     36
     37void arch_trigger_cpumask_backtrace(const cpumask_t *mask, bool exclude_self)
     38{
     39	nmi_trigger_cpumask_backtrace(mask, exclude_self,
     40				      nmi_raise_cpu_backtrace);
     41}
     42
     43static int nmi_cpu_backtrace_handler(unsigned int cmd, struct pt_regs *regs)
     44{
     45	if (nmi_cpu_backtrace(regs))
     46		return NMI_HANDLED;
     47
     48	return NMI_DONE;
     49}
     50NOKPROBE_SYMBOL(nmi_cpu_backtrace_handler);
     51
     52static int __init register_nmi_cpu_backtrace_handler(void)
     53{
     54	register_nmi_handler(NMI_LOCAL, nmi_cpu_backtrace_handler,
     55				0, "arch_bt");
     56	return 0;
     57}
     58early_initcall(register_nmi_cpu_backtrace_handler);
     59#endif