projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 1e1030dc PM |
1 | /* |
| 2 | * Copyright (C) 2007 Atmel Corporation | |
| 3 | * | |
| 4 | * This program is free software; you can redistribute it and/or modify | |
| 5 | * it under the terms of the GNU General Public License version 2 as | |
| 6 | * published by the Free Software Foundation. | |
| 7 | */ | |
| 8 | #include <linux/delay.h> | |
| 9 | #include <linux/kdebug.h> | |
| 10 | #include <linux/notifier.h> | |
| 11 | #include <linux/sched.h> | |
| 12 | #include <linux/hardirq.h> | |
| 13 | ||
| 14 | enum nmi_action { | |
| 15 | NMI_SHOW_STATE = 1 << 0, | |
| 16 | NMI_SHOW_REGS = 1 << 1, | |
| 17 | NMI_DIE = 1 << 2, | |
| 18 | NMI_DEBOUNCE = 1 << 3, | |
| 19 | }; | |
| 20 | ||
| 21 | static unsigned long nmi_actions; | |
| 22 | ||
| 23 | static int nmi_debug_notify(struct notifier_block *self, | |
| 24 | unsigned long val, void *data) | |
| 25 | { | |
| 26 | struct die_args *args = data; | |
| 27 | ||
| 28 | if (likely(val != DIE_NMI)) | |
| 29 | return NOTIFY_DONE; | |
| 30 | ||
| 31 | if (nmi_actions & NMI_SHOW_STATE) | |
| 32 | show_state(); | |
| 33 | if (nmi_actions & NMI_SHOW_REGS) | |
| 34 | show_regs(args->regs); | |
| 35 | if (nmi_actions & NMI_DEBOUNCE) | |
| 36 | mdelay(10); | |
| 37 | if (nmi_actions & NMI_DIE) | |
| 38 | return NOTIFY_BAD; | |
| 39 | ||
| 40 | return NOTIFY_OK; | |
| 41 | } | |
| 42 | ||
| 43 | static struct notifier_block nmi_debug_nb = { | |
| 44 | .notifier_call = nmi_debug_notify, | |
| 45 | }; | |
| 46 | ||
| 47 | static int __init nmi_debug_setup(char *str) | |
| 48 | { | |
| 49 | char *p, *sep; | |
| 50 | ||
| 51 | register_die_notifier(&nmi_debug_nb); | |
| 52 | ||
| 53 | if (*str != '=') | |
| 54 | return 0; | |
| 55 | ||
| 56 | for (p = str + 1; *p; p = sep + 1) { | |
| 57 | sep = strchr(p, ','); | |
| 58 | if (sep) | |
| 59 | *sep = 0; | |
| 60 | if (strcmp(p, "state") == 0) | |
| 61 | nmi_actions |= NMI_SHOW_STATE; | |
| 62 | else if (strcmp(p, "regs") == 0) | |
| 63 | nmi_actions |= NMI_SHOW_REGS; | |
| 64 | else if (strcmp(p, "debounce") == 0) | |
| 65 | nmi_actions |= NMI_DEBOUNCE; | |
| 66 | else if (strcmp(p, "die") == 0) | |
| 67 | nmi_actions |= NMI_DIE; | |
| 68 | else | |
| 69 | printk(KERN_WARNING "NMI: Unrecognized action `%s'\n", | |
| 70 | p); | |
| 71 | if (!sep) | |
| 72 | break; | |
| 73 | } | |
| 74 | ||
| 75 | return 0; | |
| 76 | } | |
| 77 | __setup("nmi_debug", nmi_debug_setup); |