Commit | Line | Data |
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8bb31b9d AG |
1 | /* |
2 | * Kprobe module for testing crash dumps | |
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 as published by | |
6 | * the Free Software Foundation; either version 2 of the License, or | |
7 | * (at your option) any later version. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, | |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License | |
15 | * along with this program; if not, write to the Free Software | |
16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. | |
17 | * | |
18 | * Copyright (C) IBM Corporation, 2006 | |
19 | * | |
20 | * Author: Ankita Garg <ankita@in.ibm.com> | |
21 | * | |
22 | * This module induces system failures at predefined crashpoints to | |
23 | * evaluate the reliability of crash dumps obtained using different dumping | |
24 | * solutions. | |
25 | * | |
26 | * It is adapted from the Linux Kernel Dump Test Tool by | |
27 | * Fernando Luis Vazquez Cao <http://lkdtt.sourceforge.net> | |
28 | * | |
0347af4e | 29 | * Debugfs support added by Simon Kagstrom <simon.kagstrom@netinsight.net> |
8bb31b9d | 30 | * |
0347af4e | 31 | * See Documentation/fault-injection/provoke-crashes.txt for instructions |
8bb31b9d AG |
32 | */ |
33 | ||
34 | #include <linux/kernel.h> | |
5d861d92 | 35 | #include <linux/fs.h> |
8bb31b9d | 36 | #include <linux/module.h> |
5d861d92 | 37 | #include <linux/buffer_head.h> |
8bb31b9d | 38 | #include <linux/kprobes.h> |
5d861d92 | 39 | #include <linux/list.h> |
8bb31b9d | 40 | #include <linux/init.h> |
8bb31b9d | 41 | #include <linux/interrupt.h> |
5d861d92 | 42 | #include <linux/hrtimer.h> |
8bb31b9d | 43 | #include <scsi/scsi_cmnd.h> |
0347af4e | 44 | #include <linux/debugfs.h> |
8bb31b9d AG |
45 | |
46 | #ifdef CONFIG_IDE | |
47 | #include <linux/ide.h> | |
48 | #endif | |
49 | ||
8bb31b9d AG |
50 | #define DEFAULT_COUNT 10 |
51 | #define REC_NUM_DEFAULT 10 | |
52 | ||
53 | enum cname { | |
54 | INVALID, | |
55 | INT_HARDWARE_ENTRY, | |
56 | INT_HW_IRQ_EN, | |
57 | INT_TASKLET_ENTRY, | |
58 | FS_DEVRW, | |
59 | MEM_SWAPOUT, | |
60 | TIMERADD, | |
61 | SCSI_DISPATCH_CMD, | |
0347af4e SK |
62 | IDE_CORE_CP, |
63 | DIRECT, | |
8bb31b9d AG |
64 | }; |
65 | ||
66 | enum ctype { | |
67 | NONE, | |
68 | PANIC, | |
69 | BUG, | |
70 | EXCEPTION, | |
71 | LOOP, | |
0347af4e SK |
72 | OVERFLOW, |
73 | CORRUPT_STACK, | |
74 | UNALIGNED_LOAD_STORE_WRITE, | |
75 | OVERWRITE_ALLOCATION, | |
76 | WRITE_AFTER_FREE, | |
8bb31b9d AG |
77 | }; |
78 | ||
79 | static char* cp_name[] = { | |
80 | "INT_HARDWARE_ENTRY", | |
81 | "INT_HW_IRQ_EN", | |
82 | "INT_TASKLET_ENTRY", | |
83 | "FS_DEVRW", | |
84 | "MEM_SWAPOUT", | |
85 | "TIMERADD", | |
86 | "SCSI_DISPATCH_CMD", | |
0347af4e SK |
87 | "IDE_CORE_CP", |
88 | "DIRECT", | |
8bb31b9d AG |
89 | }; |
90 | ||
91 | static char* cp_type[] = { | |
92 | "PANIC", | |
93 | "BUG", | |
94 | "EXCEPTION", | |
95 | "LOOP", | |
0347af4e SK |
96 | "OVERFLOW", |
97 | "CORRUPT_STACK", | |
98 | "UNALIGNED_LOAD_STORE_WRITE", | |
99 | "OVERWRITE_ALLOCATION", | |
100 | "WRITE_AFTER_FREE", | |
8bb31b9d AG |
101 | }; |
102 | ||
103 | static struct jprobe lkdtm; | |
104 | ||
105 | static int lkdtm_parse_commandline(void); | |
106 | static void lkdtm_handler(void); | |
107 | ||
ec1c620b AV |
108 | static char* cpoint_name; |
109 | static char* cpoint_type; | |
8bb31b9d AG |
110 | static int cpoint_count = DEFAULT_COUNT; |
111 | static int recur_count = REC_NUM_DEFAULT; | |
112 | ||
113 | static enum cname cpoint = INVALID; | |
114 | static enum ctype cptype = NONE; | |
115 | static int count = DEFAULT_COUNT; | |
116 | ||
117 | module_param(recur_count, int, 0644); | |
5d861d92 RD |
118 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ |
119 | "default is 10"); | |
8bb31b9d | 120 | module_param(cpoint_name, charp, 0644); |
5d861d92 RD |
121 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
122 | module_param(cpoint_type, charp, 0644); | |
123 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ | |
124 | "hitting the crash point"); | |
125 | module_param(cpoint_count, int, 0644); | |
126 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
127 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 128 | |
2118116e | 129 | static unsigned int jp_do_irq(unsigned int irq) |
8bb31b9d AG |
130 | { |
131 | lkdtm_handler(); | |
132 | jprobe_return(); | |
133 | return 0; | |
134 | } | |
135 | ||
2118116e AB |
136 | static irqreturn_t jp_handle_irq_event(unsigned int irq, |
137 | struct irqaction *action) | |
8bb31b9d AG |
138 | { |
139 | lkdtm_handler(); | |
140 | jprobe_return(); | |
141 | return 0; | |
142 | } | |
143 | ||
2118116e | 144 | static void jp_tasklet_action(struct softirq_action *a) |
8bb31b9d AG |
145 | { |
146 | lkdtm_handler(); | |
147 | jprobe_return(); | |
148 | } | |
149 | ||
2118116e | 150 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) |
8bb31b9d AG |
151 | { |
152 | lkdtm_handler(); | |
153 | jprobe_return(); | |
154 | } | |
155 | ||
156 | struct scan_control; | |
157 | ||
2118116e AB |
158 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, |
159 | struct zone *zone, | |
160 | struct scan_control *sc) | |
8bb31b9d AG |
161 | { |
162 | lkdtm_handler(); | |
163 | jprobe_return(); | |
164 | return 0; | |
165 | } | |
166 | ||
2118116e AB |
167 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, |
168 | const enum hrtimer_mode mode) | |
8bb31b9d AG |
169 | { |
170 | lkdtm_handler(); | |
171 | jprobe_return(); | |
172 | return 0; | |
173 | } | |
174 | ||
2118116e | 175 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
8bb31b9d AG |
176 | { |
177 | lkdtm_handler(); | |
178 | jprobe_return(); | |
179 | return 0; | |
180 | } | |
181 | ||
182 | #ifdef CONFIG_IDE | |
183 | int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, | |
184 | struct block_device *bdev, unsigned int cmd, | |
185 | unsigned long arg) | |
186 | { | |
187 | lkdtm_handler(); | |
188 | jprobe_return(); | |
189 | return 0; | |
190 | } | |
191 | #endif | |
192 | ||
0347af4e SK |
193 | /* Return the crashpoint number or NONE if the name is invalid */ |
194 | static enum ctype parse_cp_type(const char *what, size_t count) | |
195 | { | |
196 | int i; | |
197 | ||
198 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) { | |
199 | if (!strcmp(what, cp_type[i])) | |
200 | return i + 1; | |
201 | } | |
202 | ||
203 | return NONE; | |
204 | } | |
205 | ||
206 | static const char *cp_type_to_str(enum ctype type) | |
207 | { | |
208 | if (type == NONE || type < 0 || type > ARRAY_SIZE(cp_type)) | |
209 | return "None"; | |
210 | ||
211 | return cp_type[type - 1]; | |
212 | } | |
213 | ||
214 | static const char *cp_name_to_str(enum cname name) | |
215 | { | |
216 | if (name == INVALID || name < 0 || name > ARRAY_SIZE(cp_name)) | |
217 | return "INVALID"; | |
218 | ||
219 | return cp_name[name - 1]; | |
220 | } | |
221 | ||
222 | ||
8bb31b9d AG |
223 | static int lkdtm_parse_commandline(void) |
224 | { | |
225 | int i; | |
226 | ||
0347af4e | 227 | if (cpoint_count < 1 || recur_count < 1) |
8bb31b9d AG |
228 | return -EINVAL; |
229 | ||
0347af4e SK |
230 | count = cpoint_count; |
231 | ||
232 | /* No special parameters */ | |
233 | if (!cpoint_type && !cpoint_name) | |
234 | return 0; | |
235 | ||
236 | /* Neither or both of these need to be set */ | |
237 | if (!cpoint_type || !cpoint_name) | |
238 | return -EINVAL; | |
239 | ||
240 | cptype = parse_cp_type(cpoint_type, strlen(cpoint_type)); | |
241 | if (cptype == NONE) | |
242 | return -EINVAL; | |
243 | ||
244 | for (i = 0; i < ARRAY_SIZE(cp_name); i++) { | |
8bb31b9d AG |
245 | if (!strcmp(cpoint_name, cp_name[i])) { |
246 | cpoint = i + 1; | |
0347af4e | 247 | return 0; |
8bb31b9d AG |
248 | } |
249 | } | |
250 | ||
0347af4e SK |
251 | /* Could not find a valid crash point */ |
252 | return -EINVAL; | |
8bb31b9d AG |
253 | } |
254 | ||
255 | static int recursive_loop(int a) | |
256 | { | |
257 | char buf[1024]; | |
258 | ||
259 | memset(buf,0xFF,1024); | |
260 | recur_count--; | |
261 | if (!recur_count) | |
262 | return 0; | |
263 | else | |
264 | return recursive_loop(a); | |
265 | } | |
266 | ||
0347af4e | 267 | static void lkdtm_do_action(enum ctype which) |
8bb31b9d | 268 | { |
0347af4e SK |
269 | switch (which) { |
270 | case PANIC: | |
271 | panic("dumptest"); | |
272 | break; | |
273 | case BUG: | |
274 | BUG(); | |
275 | break; | |
276 | case EXCEPTION: | |
277 | *((int *) 0) = 0; | |
278 | break; | |
279 | case LOOP: | |
280 | for (;;) | |
281 | ; | |
282 | break; | |
283 | case OVERFLOW: | |
284 | (void) recursive_loop(0); | |
285 | break; | |
286 | case CORRUPT_STACK: { | |
287 | volatile u32 data[8]; | |
288 | volatile u32 *p = data; | |
289 | ||
290 | p[12] = 0x12345678; | |
291 | break; | |
292 | } | |
293 | case UNALIGNED_LOAD_STORE_WRITE: { | |
294 | static u8 data[5] __attribute__((aligned(4))) = {1, 2, | |
295 | 3, 4, 5}; | |
296 | u32 *p; | |
297 | u32 val = 0x12345678; | |
298 | ||
299 | p = (u32 *)(data + 1); | |
300 | if (*p == 0) | |
301 | val = 0x87654321; | |
302 | *p = val; | |
303 | break; | |
304 | } | |
305 | case OVERWRITE_ALLOCATION: { | |
306 | size_t len = 1020; | |
307 | u32 *data = kmalloc(len, GFP_KERNEL); | |
308 | ||
309 | data[1024 / sizeof(u32)] = 0x12345678; | |
310 | kfree(data); | |
311 | break; | |
312 | } | |
313 | case WRITE_AFTER_FREE: { | |
314 | size_t len = 1024; | |
315 | u32 *data = kmalloc(len, GFP_KERNEL); | |
316 | ||
317 | kfree(data); | |
318 | schedule(); | |
319 | memset(data, 0x78, len); | |
320 | break; | |
321 | } | |
322 | case NONE: | |
323 | default: | |
324 | break; | |
325 | } | |
326 | ||
327 | } | |
328 | ||
329 | static void lkdtm_handler(void) | |
330 | { | |
331 | count--; | |
332 | printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n", | |
333 | cp_name_to_str(cpoint), cp_type_to_str(cptype), count); | |
8bb31b9d AG |
334 | |
335 | if (count == 0) { | |
0347af4e | 336 | lkdtm_do_action(cptype); |
8bb31b9d AG |
337 | count = cpoint_count; |
338 | } | |
339 | } | |
340 | ||
0347af4e | 341 | static int lkdtm_register_cpoint(enum cname which) |
8bb31b9d AG |
342 | { |
343 | int ret; | |
344 | ||
0347af4e SK |
345 | cpoint = INVALID; |
346 | if (lkdtm.entry != NULL) | |
347 | unregister_jprobe(&lkdtm); | |
8bb31b9d | 348 | |
0347af4e SK |
349 | switch (which) { |
350 | case DIRECT: | |
351 | lkdtm_do_action(cptype); | |
352 | return 0; | |
8bb31b9d | 353 | case INT_HARDWARE_ENTRY: |
f58f2fa9 | 354 | lkdtm.kp.symbol_name = "do_IRQ"; |
8bb31b9d AG |
355 | lkdtm.entry = (kprobe_opcode_t*) jp_do_irq; |
356 | break; | |
357 | case INT_HW_IRQ_EN: | |
358 | lkdtm.kp.symbol_name = "handle_IRQ_event"; | |
359 | lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event; | |
360 | break; | |
361 | case INT_TASKLET_ENTRY: | |
362 | lkdtm.kp.symbol_name = "tasklet_action"; | |
363 | lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action; | |
364 | break; | |
365 | case FS_DEVRW: | |
366 | lkdtm.kp.symbol_name = "ll_rw_block"; | |
367 | lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block; | |
368 | break; | |
369 | case MEM_SWAPOUT: | |
18a61e4a AG |
370 | lkdtm.kp.symbol_name = "shrink_inactive_list"; |
371 | lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; | |
8bb31b9d AG |
372 | break; |
373 | case TIMERADD: | |
374 | lkdtm.kp.symbol_name = "hrtimer_start"; | |
375 | lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start; | |
376 | break; | |
377 | case SCSI_DISPATCH_CMD: | |
378 | lkdtm.kp.symbol_name = "scsi_dispatch_cmd"; | |
379 | lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd; | |
380 | break; | |
381 | case IDE_CORE_CP: | |
382 | #ifdef CONFIG_IDE | |
383 | lkdtm.kp.symbol_name = "generic_ide_ioctl"; | |
384 | lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl; | |
385 | #else | |
0347af4e SK |
386 | printk(KERN_INFO "lkdtm: Crash point not available\n"); |
387 | return -EINVAL; | |
8bb31b9d AG |
388 | #endif |
389 | break; | |
390 | default: | |
0347af4e SK |
391 | printk(KERN_INFO "lkdtm: Invalid Crash Point\n"); |
392 | return -EINVAL; | |
8bb31b9d AG |
393 | } |
394 | ||
0347af4e | 395 | cpoint = which; |
8bb31b9d | 396 | if ((ret = register_jprobe(&lkdtm)) < 0) { |
0347af4e SK |
397 | printk(KERN_INFO "lkdtm: Couldn't register jprobe\n"); |
398 | cpoint = INVALID; | |
399 | } | |
400 | ||
401 | return ret; | |
402 | } | |
403 | ||
404 | static ssize_t do_register_entry(enum cname which, struct file *f, | |
405 | const char __user *user_buf, size_t count, loff_t *off) | |
406 | { | |
407 | char *buf; | |
408 | int err; | |
409 | ||
410 | if (count >= PAGE_SIZE) | |
411 | return -EINVAL; | |
412 | ||
413 | buf = (char *)__get_free_page(GFP_KERNEL); | |
414 | if (!buf) | |
415 | return -ENOMEM; | |
416 | if (copy_from_user(buf, user_buf, count)) { | |
417 | free_page((unsigned long) buf); | |
418 | return -EFAULT; | |
419 | } | |
420 | /* NULL-terminate and remove enter */ | |
421 | buf[count] = '\0'; | |
422 | strim(buf); | |
423 | ||
424 | cptype = parse_cp_type(buf, count); | |
425 | free_page((unsigned long) buf); | |
426 | ||
427 | if (cptype == NONE) | |
428 | return -EINVAL; | |
429 | ||
430 | err = lkdtm_register_cpoint(which); | |
431 | if (err < 0) | |
432 | return err; | |
433 | ||
434 | *off += count; | |
435 | ||
436 | return count; | |
437 | } | |
438 | ||
439 | /* Generic read callback that just prints out the available crash types */ | |
440 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
441 | size_t count, loff_t *off) | |
442 | { | |
443 | char *buf; | |
444 | int i, n, out; | |
445 | ||
446 | buf = (char *)__get_free_page(GFP_KERNEL); | |
447 | ||
448 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
449 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) | |
450 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]); | |
451 | buf[n] = '\0'; | |
452 | ||
453 | out = simple_read_from_buffer(user_buf, count, off, | |
454 | buf, n); | |
455 | free_page((unsigned long) buf); | |
456 | ||
457 | return out; | |
458 | } | |
459 | ||
460 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
461 | { | |
462 | return 0; | |
463 | } | |
464 | ||
465 | ||
466 | static ssize_t int_hardware_entry(struct file *f, const char __user *buf, | |
467 | size_t count, loff_t *off) | |
468 | { | |
469 | return do_register_entry(INT_HARDWARE_ENTRY, f, buf, count, off); | |
470 | } | |
471 | ||
472 | static ssize_t int_hw_irq_en(struct file *f, const char __user *buf, | |
473 | size_t count, loff_t *off) | |
474 | { | |
475 | return do_register_entry(INT_HW_IRQ_EN, f, buf, count, off); | |
476 | } | |
477 | ||
478 | static ssize_t int_tasklet_entry(struct file *f, const char __user *buf, | |
479 | size_t count, loff_t *off) | |
480 | { | |
481 | return do_register_entry(INT_TASKLET_ENTRY, f, buf, count, off); | |
482 | } | |
483 | ||
484 | static ssize_t fs_devrw_entry(struct file *f, const char __user *buf, | |
485 | size_t count, loff_t *off) | |
486 | { | |
487 | return do_register_entry(FS_DEVRW, f, buf, count, off); | |
488 | } | |
489 | ||
490 | static ssize_t mem_swapout_entry(struct file *f, const char __user *buf, | |
491 | size_t count, loff_t *off) | |
492 | { | |
493 | return do_register_entry(MEM_SWAPOUT, f, buf, count, off); | |
494 | } | |
495 | ||
496 | static ssize_t timeradd_entry(struct file *f, const char __user *buf, | |
497 | size_t count, loff_t *off) | |
498 | { | |
499 | return do_register_entry(TIMERADD, f, buf, count, off); | |
500 | } | |
501 | ||
502 | static ssize_t scsi_dispatch_cmd_entry(struct file *f, | |
503 | const char __user *buf, size_t count, loff_t *off) | |
504 | { | |
505 | return do_register_entry(SCSI_DISPATCH_CMD, f, buf, count, off); | |
506 | } | |
507 | ||
508 | static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf, | |
509 | size_t count, loff_t *off) | |
510 | { | |
511 | return do_register_entry(IDE_CORE_CP, f, buf, count, off); | |
512 | } | |
513 | ||
514 | /* Special entry to just crash directly. Available without KPROBEs */ | |
515 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
516 | size_t count, loff_t *off) | |
517 | { | |
518 | enum ctype type; | |
519 | char *buf; | |
520 | ||
521 | if (count >= PAGE_SIZE) | |
522 | return -EINVAL; | |
523 | if (count < 1) | |
524 | return -EINVAL; | |
525 | ||
526 | buf = (char *)__get_free_page(GFP_KERNEL); | |
527 | if (!buf) | |
528 | return -ENOMEM; | |
529 | if (copy_from_user(buf, user_buf, count)) { | |
530 | free_page((unsigned long) buf); | |
531 | return -EFAULT; | |
532 | } | |
533 | /* NULL-terminate and remove enter */ | |
534 | buf[count] = '\0'; | |
535 | strim(buf); | |
536 | ||
537 | type = parse_cp_type(buf, count); | |
538 | free_page((unsigned long) buf); | |
539 | if (type == NONE) | |
540 | return -EINVAL; | |
541 | ||
542 | printk(KERN_INFO "lkdtm: Performing direct entry %s\n", | |
543 | cp_type_to_str(type)); | |
544 | lkdtm_do_action(type); | |
545 | *off += count; | |
546 | ||
547 | return count; | |
548 | } | |
549 | ||
550 | struct crash_entry { | |
551 | const char *name; | |
552 | const struct file_operations fops; | |
553 | }; | |
554 | ||
555 | static const struct crash_entry crash_entries[] = { | |
556 | {"DIRECT", {.read = lkdtm_debugfs_read, | |
557 | .open = lkdtm_debugfs_open, | |
558 | .write = direct_entry} }, | |
559 | {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, | |
560 | .open = lkdtm_debugfs_open, | |
561 | .write = int_hardware_entry} }, | |
562 | {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, | |
563 | .open = lkdtm_debugfs_open, | |
564 | .write = int_hw_irq_en} }, | |
565 | {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, | |
566 | .open = lkdtm_debugfs_open, | |
567 | .write = int_tasklet_entry} }, | |
568 | {"FS_DEVRW", {.read = lkdtm_debugfs_read, | |
569 | .open = lkdtm_debugfs_open, | |
570 | .write = fs_devrw_entry} }, | |
571 | {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, | |
572 | .open = lkdtm_debugfs_open, | |
573 | .write = mem_swapout_entry} }, | |
574 | {"TIMERADD", {.read = lkdtm_debugfs_read, | |
575 | .open = lkdtm_debugfs_open, | |
576 | .write = timeradd_entry} }, | |
577 | {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, | |
578 | .open = lkdtm_debugfs_open, | |
579 | .write = scsi_dispatch_cmd_entry} }, | |
580 | {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, | |
581 | .open = lkdtm_debugfs_open, | |
582 | .write = ide_core_cp_entry} }, | |
583 | }; | |
584 | ||
585 | static struct dentry *lkdtm_debugfs_root; | |
586 | ||
587 | static int __init lkdtm_module_init(void) | |
588 | { | |
589 | int ret = -EINVAL; | |
590 | int n_debugfs_entries = 1; /* Assume only the direct entry */ | |
591 | int i; | |
592 | ||
593 | /* Register debugfs interface */ | |
594 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
595 | if (!lkdtm_debugfs_root) { | |
596 | printk(KERN_ERR "lkdtm: creating root dir failed\n"); | |
597 | return -ENODEV; | |
598 | } | |
599 | ||
600 | #ifdef CONFIG_KPROBES | |
601 | n_debugfs_entries = ARRAY_SIZE(crash_entries); | |
602 | #endif | |
603 | ||
604 | for (i = 0; i < n_debugfs_entries; i++) { | |
605 | const struct crash_entry *cur = &crash_entries[i]; | |
606 | struct dentry *de; | |
607 | ||
608 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
609 | NULL, &cur->fops); | |
610 | if (de == NULL) { | |
611 | printk(KERN_ERR "lkdtm: could not create %s\n", | |
612 | cur->name); | |
613 | goto out_err; | |
614 | } | |
615 | } | |
616 | ||
617 | if (lkdtm_parse_commandline() == -EINVAL) { | |
618 | printk(KERN_INFO "lkdtm: Invalid command\n"); | |
619 | goto out_err; | |
620 | } | |
621 | ||
622 | if (cpoint != INVALID && cptype != NONE) { | |
623 | ret = lkdtm_register_cpoint(cpoint); | |
624 | if (ret < 0) { | |
625 | printk(KERN_INFO "lkdtm: Invalid crash point %d\n", | |
626 | cpoint); | |
627 | goto out_err; | |
628 | } | |
629 | printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n", | |
630 | cpoint_name, cpoint_type); | |
631 | } else { | |
632 | printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n"); | |
8bb31b9d AG |
633 | } |
634 | ||
8bb31b9d | 635 | return 0; |
0347af4e SK |
636 | |
637 | out_err: | |
638 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
639 | return ret; | |
8bb31b9d AG |
640 | } |
641 | ||
2118116e | 642 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 643 | { |
0347af4e SK |
644 | debugfs_remove_recursive(lkdtm_debugfs_root); |
645 | ||
646 | unregister_jprobe(&lkdtm); | |
647 | printk(KERN_INFO "lkdtm: Crash point unregistered\n"); | |
8bb31b9d AG |
648 | } |
649 | ||
650 | module_init(lkdtm_module_init); | |
651 | module_exit(lkdtm_module_exit); | |
652 | ||
653 | MODULE_LICENSE("GPL"); |