diff options
Diffstat (limited to 'drivers/soc/marvell/gti/gti.c')
| -rw-r--r-- | drivers/soc/marvell/gti/gti.c | 64 |
1 files changed, 64 insertions, 0 deletions
diff --git a/drivers/soc/marvell/gti/gti.c b/drivers/soc/marvell/gti/gti.c new file mode 100644 index 000000000000..c571b613af39 --- /dev/null +++ b/drivers/soc/marvell/gti/gti.c @@ -0,0 +1,64 @@ +// 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. + */ +} |