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- // SPDX-License-Identifier: GPL-2.0
- /*
- * Copyright (C) 2007 Atmel Corporation
- */
- #include <linux/delay.h>
- #include <linux/kdebug.h>
- #include <linux/notifier.h>
- #include <linux/sched.h>
- #include <linux/sched/debug.h>
- #include <linux/hardirq.h>
- enum nmi_action {
- NMI_SHOW_STATE = 1 << 0,
- NMI_SHOW_REGS = 1 << 1,
- NMI_DIE = 1 << 2,
- NMI_DEBOUNCE = 1 << 3,
- };
- static unsigned long nmi_actions;
- static int nmi_debug_notify(struct notifier_block *self,
- unsigned long val, void *data)
- {
- struct die_args *args = data;
- if (likely(val != DIE_NMI))
- return NOTIFY_DONE;
- if (nmi_actions & NMI_SHOW_STATE)
- show_state();
- if (nmi_actions & NMI_SHOW_REGS)
- show_regs(args->regs);
- if (nmi_actions & NMI_DEBOUNCE)
- mdelay(10);
- if (nmi_actions & NMI_DIE)
- return NOTIFY_BAD;
- return NOTIFY_OK;
- }
- static struct notifier_block nmi_debug_nb = {
- .notifier_call = nmi_debug_notify,
- };
- static int __init nmi_debug_setup(char *str)
- {
- char *p, *sep;
- register_die_notifier(&nmi_debug_nb);
- if (*str != '=')
- return 1;
- for (p = str + 1; *p; p = sep + 1) {
- sep = strchr(p, ',');
- if (sep)
- *sep = 0;
- if (strcmp(p, "state") == 0)
- nmi_actions |= NMI_SHOW_STATE;
- else if (strcmp(p, "regs") == 0)
- nmi_actions |= NMI_SHOW_REGS;
- else if (strcmp(p, "debounce") == 0)
- nmi_actions |= NMI_DEBOUNCE;
- else if (strcmp(p, "die") == 0)
- nmi_actions |= NMI_DIE;
- else
- printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
- p);
- if (!sep)
- break;
- }
- return 1;
- }
- __setup("nmi_debug", nmi_debug_setup);
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