| 1 | |
| 2 | |
| 3 | * Copyright (C) 2007 Atmel Corporation
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| 4 |
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| 5 | #include <linux/delay.h>
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| 6 | #include <linux/kdebug.h>
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| 7 | #include <linux/notifier.h>
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| 8 | #include <linux/sched.h>
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| 9 | #include <linux/sched/debug.h>
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| 10 | #include <linux/hardirq.h>
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| 11 |
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| 12 | enum nmi_action {
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| 13 | NMI_SHOW_STATE = 1 << 0,
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| 14 | NMI_SHOW_REGS = 1 << 1,
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| 15 | NMI_DIE = 1 << 2,
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| 16 | NMI_DEBOUNCE = 1 << 3,
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| 17 | };
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| 18 |
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| 19 | static unsigned long nmi_actions;
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| 20 |
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| 21 | static int nmi_debug_notify(struct notifier_block *self,
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| 22 | unsigned long val, void *data)
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| 23 | {
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| 24 | struct die_args *args = data;
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| 25 |
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| 26 | if (likely(val != DIE_NMI))
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| 27 | return NOTIFY_DONE;
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| 28 |
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| 29 | if (nmi_actions & NMI_SHOW_STATE)
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| 30 | show_state();
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| 31 | if (nmi_actions & NMI_SHOW_REGS)
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| 32 | show_regs(args->regs);
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| 33 | if (nmi_actions & NMI_DEBOUNCE)
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| 34 | mdelay(10);
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| 35 | if (nmi_actions & NMI_DIE)
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| 36 | return NOTIFY_BAD;
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| 37 |
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| 38 | return NOTIFY_OK;
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| 39 | }
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| 40 |
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| 41 | static struct notifier_block nmi_debug_nb = {
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| 42 | .notifier_call = nmi_debug_notify,
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| 43 | };
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| 44 |
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| 45 | static int __init nmi_debug_setup(char *str)
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| 46 | {
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| 47 | char *p, *sep;
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| 48 |
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| 49 | register_die_notifier(&nmi_debug_nb);
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| 50 |
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| 51 | if (*str != '=')
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| 52 | return 1;
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| 53 |
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| 54 | for (p = str + 1; *p; p = sep + 1) {
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| 55 | sep = strchr(p, ',');
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| 56 | if (sep)
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| 57 | *sep = 0;
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| 58 | if (strcmp(p, "state") == 0)
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| 59 | nmi_actions |= NMI_SHOW_STATE;
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| 60 | else if (strcmp(p, "regs") == 0)
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| 61 | nmi_actions |= NMI_SHOW_REGS;
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| 62 | else if (strcmp(p, "debounce") == 0)
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| 63 | nmi_actions |= NMI_DEBOUNCE;
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| 64 | else if (strcmp(p, "die") == 0)
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| 65 | nmi_actions |= NMI_DIE;
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| 66 | else
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| 67 | printk(KERN_WARNING "NMI: Unrecognized action `%s'\n",
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| 68 | p);
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| 69 | if (!sep)
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| 70 | break;
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| 71 | }
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| 72 |
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| 73 | return 1;
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| 74 | }
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| 75 | __setup("nmi_debug", nmi_debug_setup);
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