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// SPDX-License-Identifier: GPL-2.0
/* Marvell GTI Watchdog driver
*
* Copyright (C) 2018 Marvell International Ltd.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <linux/kernel.h>
#include <linux/cpu.h>
#include <linux/nmi.h>
#include <linux/module.h>
#include <linux/irq.h>
#include <linux/interrupt.h>
#include <linux/sched/debug.h>
#include "gti.h"
/* Kernel exception simulation wrapper for the NMI kernel exception handler */
void nmi_kernel_callback_other_cpus(void *unused)
{
struct pt_regs *regs = get_irq_regs();
pr_emerg("Watchdog CPU:%d\n", raw_smp_processor_id());
if (regs)
show_regs(regs);
else
dump_stack();
}
void nmi_kernel_callback(struct pt_regs *regs)
{
int c;
pr_emerg("Watchdog CPU:%d Hard LOCKUP\n", raw_smp_processor_id());
if (regs)
show_regs(regs);
else
dump_stack();
for_each_online_cpu(c) {
if (c == raw_smp_processor_id())
continue;
/*
* We are making a synchronous call to other cores and
* waiting for those cores to dump their state/context,
* if one of the cores is hanged or unable to respond
* to interrupts, we can wait here forever, currently
* depending on our NMI timer to trigger a system-wide
* warm reset to break out of such deadlocks.
*/
smp_call_function_single(c,
nmi_kernel_callback_other_cpus, NULL, 1);
}
/*
* Return to the interrupted state via el3 and attempt
* application recovery.
*/
}
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