projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| 5933f6d2 | 1 | // SPDX-License-Identifier: GPL-2.0 |
| 1e1030dc PM |
2 | /* |
| 3 | * Copyright (C) 2007 Atmel Corporation | |
| 1e1030dc PM |
4 | */ |
| 5 | #include <linux/delay.h> | |
| 6 | #include <linux/kdebug.h> | |
| 7 | #include <linux/notifier.h> | |
| 8 | #include <linux/sched.h> | |
| b17b0153 | 9 | #include <linux/sched/debug.h> |
| 1e1030dc PM |
10 | #include <linux/hardirq.h> |
| 11 | ||
| 12 | enum nmi_action { | |
| 13 | NMI_SHOW_STATE = 1 << 0, | |
| 14 | NMI_SHOW_REGS = 1 << 1, | |
| 15 | NMI_DIE = 1 << 2, | |
| 16 | NMI_DEBOUNCE = 1 << 3, | |
| 17 | }; | |
| 18 | ||
| 19 | static unsigned long nmi_actions; | |
| 20 | ||
| 21 | static int nmi_debug_notify(struct notifier_block *self, | |
| 22 | unsigned long val, void *data) | |
| 23 | { | |
| 24 | struct die_args *args = data; | |
| 25 | ||
| 26 | if (likely(val != DIE_NMI)) | |
| 27 | return NOTIFY_DONE; | |
| 28 | ||
| 29 | if (nmi_actions & NMI_SHOW_STATE) | |
| 30 | show_state(); | |
| 31 | if (nmi_actions & NMI_SHOW_REGS) | |
| 32 | show_regs(args->regs); | |
| 33 | if (nmi_actions & NMI_DEBOUNCE) | |
| 34 | mdelay(10); | |
| 35 | if (nmi_actions & NMI_DIE) | |
| 36 | return NOTIFY_BAD; | |
| 37 | ||
| 38 | return NOTIFY_OK; | |
| 39 | } | |
| 40 | ||
| 41 | static struct notifier_block nmi_debug_nb = { | |
| 42 | .notifier_call = nmi_debug_notify, | |
| 43 | }; | |
| 44 | ||
| 45 | static int __init nmi_debug_setup(char *str) | |
| 46 | { | |
| 47 | char *p, *sep; | |
| 48 | ||
| 49 | register_die_notifier(&nmi_debug_nb); | |
| 50 | ||
| 51 | if (*str != '=') | |
| d1155e41 | 52 | return 1; |
| 1e1030dc PM |
53 | |
| 54 | for (p = str + 1; *p; p = sep + 1) { | |
| 55 | sep = strchr(p, ','); | |
| 56 | if (sep) | |
| 57 | *sep = 0; | |
| 58 | if (strcmp(p, "state") == 0) | |
| 59 | nmi_actions |= NMI_SHOW_STATE; | |
| 60 | else if (strcmp(p, "regs") == 0) | |
| 61 | nmi_actions |= NMI_SHOW_REGS; | |
| 62 | else if (strcmp(p, "debounce") == 0) | |
| 63 | nmi_actions |= NMI_DEBOUNCE; | |
| 64 | else if (strcmp(p, "die") == 0) | |
| 65 | nmi_actions |= NMI_DIE; | |
| 66 | else | |
| 67 | printk(KERN_WARNING "NMI: Unrecognized action `%s'\n", | |
| 68 | p); | |
| 69 | if (!sep) | |
| 70 | break; | |
| 71 | } | |
| 72 | ||
| d1155e41 | 73 | return 1; |
| 1e1030dc PM |
74 | } |
| 75 | __setup("nmi_debug", nmi_debug_setup); |