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> |
5a0e3ad6 | 43 | #include <linux/slab.h> |
8bb31b9d | 44 | #include <scsi/scsi_cmnd.h> |
0347af4e | 45 | #include <linux/debugfs.h> |
8bb31b9d AG |
46 | |
47 | #ifdef CONFIG_IDE | |
48 | #include <linux/ide.h> | |
49 | #endif | |
50 | ||
8bb31b9d AG |
51 | #define DEFAULT_COUNT 10 |
52 | #define REC_NUM_DEFAULT 10 | |
53 | ||
54 | enum cname { | |
55 | INVALID, | |
56 | INT_HARDWARE_ENTRY, | |
57 | INT_HW_IRQ_EN, | |
58 | INT_TASKLET_ENTRY, | |
59 | FS_DEVRW, | |
60 | MEM_SWAPOUT, | |
61 | TIMERADD, | |
62 | SCSI_DISPATCH_CMD, | |
0347af4e SK |
63 | IDE_CORE_CP, |
64 | DIRECT, | |
8bb31b9d AG |
65 | }; |
66 | ||
67 | enum ctype { | |
68 | NONE, | |
69 | PANIC, | |
70 | BUG, | |
71 | EXCEPTION, | |
72 | LOOP, | |
0347af4e SK |
73 | OVERFLOW, |
74 | CORRUPT_STACK, | |
75 | UNALIGNED_LOAD_STORE_WRITE, | |
76 | OVERWRITE_ALLOCATION, | |
77 | WRITE_AFTER_FREE, | |
8bb31b9d AG |
78 | }; |
79 | ||
80 | static char* cp_name[] = { | |
81 | "INT_HARDWARE_ENTRY", | |
82 | "INT_HW_IRQ_EN", | |
83 | "INT_TASKLET_ENTRY", | |
84 | "FS_DEVRW", | |
85 | "MEM_SWAPOUT", | |
86 | "TIMERADD", | |
87 | "SCSI_DISPATCH_CMD", | |
0347af4e SK |
88 | "IDE_CORE_CP", |
89 | "DIRECT", | |
8bb31b9d AG |
90 | }; |
91 | ||
92 | static char* cp_type[] = { | |
93 | "PANIC", | |
94 | "BUG", | |
95 | "EXCEPTION", | |
96 | "LOOP", | |
0347af4e SK |
97 | "OVERFLOW", |
98 | "CORRUPT_STACK", | |
99 | "UNALIGNED_LOAD_STORE_WRITE", | |
100 | "OVERWRITE_ALLOCATION", | |
101 | "WRITE_AFTER_FREE", | |
8bb31b9d AG |
102 | }; |
103 | ||
104 | static struct jprobe lkdtm; | |
105 | ||
106 | static int lkdtm_parse_commandline(void); | |
107 | static void lkdtm_handler(void); | |
108 | ||
ec1c620b AV |
109 | static char* cpoint_name; |
110 | static char* cpoint_type; | |
8bb31b9d AG |
111 | static int cpoint_count = DEFAULT_COUNT; |
112 | static int recur_count = REC_NUM_DEFAULT; | |
113 | ||
114 | static enum cname cpoint = INVALID; | |
115 | static enum ctype cptype = NONE; | |
116 | static int count = DEFAULT_COUNT; | |
117 | ||
118 | module_param(recur_count, int, 0644); | |
5d861d92 RD |
119 | MODULE_PARM_DESC(recur_count, " Recursion level for the stack overflow test, "\ |
120 | "default is 10"); | |
8bb31b9d | 121 | module_param(cpoint_name, charp, 0644); |
5d861d92 RD |
122 | MODULE_PARM_DESC(cpoint_name, " Crash Point, where kernel is to be crashed"); |
123 | module_param(cpoint_type, charp, 0644); | |
124 | MODULE_PARM_DESC(cpoint_type, " Crash Point Type, action to be taken on "\ | |
125 | "hitting the crash point"); | |
126 | module_param(cpoint_count, int, 0644); | |
127 | MODULE_PARM_DESC(cpoint_count, " Crash Point Count, number of times the "\ | |
128 | "crash point is to be hit to trigger action"); | |
8bb31b9d | 129 | |
2118116e | 130 | static unsigned int jp_do_irq(unsigned int irq) |
8bb31b9d AG |
131 | { |
132 | lkdtm_handler(); | |
133 | jprobe_return(); | |
134 | return 0; | |
135 | } | |
136 | ||
2118116e AB |
137 | static irqreturn_t jp_handle_irq_event(unsigned int irq, |
138 | struct irqaction *action) | |
8bb31b9d AG |
139 | { |
140 | lkdtm_handler(); | |
141 | jprobe_return(); | |
142 | return 0; | |
143 | } | |
144 | ||
2118116e | 145 | static void jp_tasklet_action(struct softirq_action *a) |
8bb31b9d AG |
146 | { |
147 | lkdtm_handler(); | |
148 | jprobe_return(); | |
149 | } | |
150 | ||
2118116e | 151 | static void jp_ll_rw_block(int rw, int nr, struct buffer_head *bhs[]) |
8bb31b9d AG |
152 | { |
153 | lkdtm_handler(); | |
154 | jprobe_return(); | |
155 | } | |
156 | ||
157 | struct scan_control; | |
158 | ||
2118116e AB |
159 | static unsigned long jp_shrink_inactive_list(unsigned long max_scan, |
160 | struct zone *zone, | |
161 | struct scan_control *sc) | |
8bb31b9d AG |
162 | { |
163 | lkdtm_handler(); | |
164 | jprobe_return(); | |
165 | return 0; | |
166 | } | |
167 | ||
2118116e AB |
168 | static int jp_hrtimer_start(struct hrtimer *timer, ktime_t tim, |
169 | const enum hrtimer_mode mode) | |
8bb31b9d AG |
170 | { |
171 | lkdtm_handler(); | |
172 | jprobe_return(); | |
173 | return 0; | |
174 | } | |
175 | ||
2118116e | 176 | static int jp_scsi_dispatch_cmd(struct scsi_cmnd *cmd) |
8bb31b9d AG |
177 | { |
178 | lkdtm_handler(); | |
179 | jprobe_return(); | |
180 | return 0; | |
181 | } | |
182 | ||
183 | #ifdef CONFIG_IDE | |
184 | int jp_generic_ide_ioctl(ide_drive_t *drive, struct file *file, | |
185 | struct block_device *bdev, unsigned int cmd, | |
186 | unsigned long arg) | |
187 | { | |
188 | lkdtm_handler(); | |
189 | jprobe_return(); | |
190 | return 0; | |
191 | } | |
192 | #endif | |
193 | ||
0347af4e SK |
194 | /* Return the crashpoint number or NONE if the name is invalid */ |
195 | static enum ctype parse_cp_type(const char *what, size_t count) | |
196 | { | |
197 | int i; | |
198 | ||
199 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) { | |
200 | if (!strcmp(what, cp_type[i])) | |
201 | return i + 1; | |
202 | } | |
203 | ||
204 | return NONE; | |
205 | } | |
206 | ||
207 | static const char *cp_type_to_str(enum ctype type) | |
208 | { | |
209 | if (type == NONE || type < 0 || type > ARRAY_SIZE(cp_type)) | |
210 | return "None"; | |
211 | ||
212 | return cp_type[type - 1]; | |
213 | } | |
214 | ||
215 | static const char *cp_name_to_str(enum cname name) | |
216 | { | |
217 | if (name == INVALID || name < 0 || name > ARRAY_SIZE(cp_name)) | |
218 | return "INVALID"; | |
219 | ||
220 | return cp_name[name - 1]; | |
221 | } | |
222 | ||
223 | ||
8bb31b9d AG |
224 | static int lkdtm_parse_commandline(void) |
225 | { | |
226 | int i; | |
227 | ||
0347af4e | 228 | if (cpoint_count < 1 || recur_count < 1) |
8bb31b9d AG |
229 | return -EINVAL; |
230 | ||
0347af4e SK |
231 | count = cpoint_count; |
232 | ||
233 | /* No special parameters */ | |
234 | if (!cpoint_type && !cpoint_name) | |
235 | return 0; | |
236 | ||
237 | /* Neither or both of these need to be set */ | |
238 | if (!cpoint_type || !cpoint_name) | |
239 | return -EINVAL; | |
240 | ||
241 | cptype = parse_cp_type(cpoint_type, strlen(cpoint_type)); | |
242 | if (cptype == NONE) | |
243 | return -EINVAL; | |
244 | ||
245 | for (i = 0; i < ARRAY_SIZE(cp_name); i++) { | |
8bb31b9d AG |
246 | if (!strcmp(cpoint_name, cp_name[i])) { |
247 | cpoint = i + 1; | |
0347af4e | 248 | return 0; |
8bb31b9d AG |
249 | } |
250 | } | |
251 | ||
0347af4e SK |
252 | /* Could not find a valid crash point */ |
253 | return -EINVAL; | |
8bb31b9d AG |
254 | } |
255 | ||
256 | static int recursive_loop(int a) | |
257 | { | |
258 | char buf[1024]; | |
259 | ||
260 | memset(buf,0xFF,1024); | |
261 | recur_count--; | |
262 | if (!recur_count) | |
263 | return 0; | |
264 | else | |
265 | return recursive_loop(a); | |
266 | } | |
267 | ||
0347af4e | 268 | static void lkdtm_do_action(enum ctype which) |
8bb31b9d | 269 | { |
0347af4e SK |
270 | switch (which) { |
271 | case PANIC: | |
272 | panic("dumptest"); | |
273 | break; | |
274 | case BUG: | |
275 | BUG(); | |
276 | break; | |
277 | case EXCEPTION: | |
278 | *((int *) 0) = 0; | |
279 | break; | |
280 | case LOOP: | |
281 | for (;;) | |
282 | ; | |
283 | break; | |
284 | case OVERFLOW: | |
285 | (void) recursive_loop(0); | |
286 | break; | |
287 | case CORRUPT_STACK: { | |
288 | volatile u32 data[8]; | |
289 | volatile u32 *p = data; | |
290 | ||
291 | p[12] = 0x12345678; | |
292 | break; | |
293 | } | |
294 | case UNALIGNED_LOAD_STORE_WRITE: { | |
295 | static u8 data[5] __attribute__((aligned(4))) = {1, 2, | |
296 | 3, 4, 5}; | |
297 | u32 *p; | |
298 | u32 val = 0x12345678; | |
299 | ||
300 | p = (u32 *)(data + 1); | |
301 | if (*p == 0) | |
302 | val = 0x87654321; | |
303 | *p = val; | |
304 | break; | |
305 | } | |
306 | case OVERWRITE_ALLOCATION: { | |
307 | size_t len = 1020; | |
308 | u32 *data = kmalloc(len, GFP_KERNEL); | |
309 | ||
310 | data[1024 / sizeof(u32)] = 0x12345678; | |
311 | kfree(data); | |
312 | break; | |
313 | } | |
314 | case WRITE_AFTER_FREE: { | |
315 | size_t len = 1024; | |
316 | u32 *data = kmalloc(len, GFP_KERNEL); | |
317 | ||
318 | kfree(data); | |
319 | schedule(); | |
320 | memset(data, 0x78, len); | |
321 | break; | |
322 | } | |
323 | case NONE: | |
324 | default: | |
325 | break; | |
326 | } | |
327 | ||
328 | } | |
329 | ||
330 | static void lkdtm_handler(void) | |
331 | { | |
332 | count--; | |
333 | printk(KERN_INFO "lkdtm: Crash point %s of type %s hit, trigger in %d rounds\n", | |
334 | cp_name_to_str(cpoint), cp_type_to_str(cptype), count); | |
8bb31b9d AG |
335 | |
336 | if (count == 0) { | |
0347af4e | 337 | lkdtm_do_action(cptype); |
8bb31b9d AG |
338 | count = cpoint_count; |
339 | } | |
340 | } | |
341 | ||
0347af4e | 342 | static int lkdtm_register_cpoint(enum cname which) |
8bb31b9d AG |
343 | { |
344 | int ret; | |
345 | ||
0347af4e SK |
346 | cpoint = INVALID; |
347 | if (lkdtm.entry != NULL) | |
348 | unregister_jprobe(&lkdtm); | |
8bb31b9d | 349 | |
0347af4e SK |
350 | switch (which) { |
351 | case DIRECT: | |
352 | lkdtm_do_action(cptype); | |
353 | return 0; | |
8bb31b9d | 354 | case INT_HARDWARE_ENTRY: |
f58f2fa9 | 355 | lkdtm.kp.symbol_name = "do_IRQ"; |
8bb31b9d AG |
356 | lkdtm.entry = (kprobe_opcode_t*) jp_do_irq; |
357 | break; | |
358 | case INT_HW_IRQ_EN: | |
359 | lkdtm.kp.symbol_name = "handle_IRQ_event"; | |
360 | lkdtm.entry = (kprobe_opcode_t*) jp_handle_irq_event; | |
361 | break; | |
362 | case INT_TASKLET_ENTRY: | |
363 | lkdtm.kp.symbol_name = "tasklet_action"; | |
364 | lkdtm.entry = (kprobe_opcode_t*) jp_tasklet_action; | |
365 | break; | |
366 | case FS_DEVRW: | |
367 | lkdtm.kp.symbol_name = "ll_rw_block"; | |
368 | lkdtm.entry = (kprobe_opcode_t*) jp_ll_rw_block; | |
369 | break; | |
370 | case MEM_SWAPOUT: | |
18a61e4a AG |
371 | lkdtm.kp.symbol_name = "shrink_inactive_list"; |
372 | lkdtm.entry = (kprobe_opcode_t*) jp_shrink_inactive_list; | |
8bb31b9d AG |
373 | break; |
374 | case TIMERADD: | |
375 | lkdtm.kp.symbol_name = "hrtimer_start"; | |
376 | lkdtm.entry = (kprobe_opcode_t*) jp_hrtimer_start; | |
377 | break; | |
378 | case SCSI_DISPATCH_CMD: | |
379 | lkdtm.kp.symbol_name = "scsi_dispatch_cmd"; | |
380 | lkdtm.entry = (kprobe_opcode_t*) jp_scsi_dispatch_cmd; | |
381 | break; | |
382 | case IDE_CORE_CP: | |
383 | #ifdef CONFIG_IDE | |
384 | lkdtm.kp.symbol_name = "generic_ide_ioctl"; | |
385 | lkdtm.entry = (kprobe_opcode_t*) jp_generic_ide_ioctl; | |
386 | #else | |
0347af4e SK |
387 | printk(KERN_INFO "lkdtm: Crash point not available\n"); |
388 | return -EINVAL; | |
8bb31b9d AG |
389 | #endif |
390 | break; | |
391 | default: | |
0347af4e SK |
392 | printk(KERN_INFO "lkdtm: Invalid Crash Point\n"); |
393 | return -EINVAL; | |
8bb31b9d AG |
394 | } |
395 | ||
0347af4e | 396 | cpoint = which; |
8bb31b9d | 397 | if ((ret = register_jprobe(&lkdtm)) < 0) { |
0347af4e SK |
398 | printk(KERN_INFO "lkdtm: Couldn't register jprobe\n"); |
399 | cpoint = INVALID; | |
400 | } | |
401 | ||
402 | return ret; | |
403 | } | |
404 | ||
405 | static ssize_t do_register_entry(enum cname which, struct file *f, | |
406 | const char __user *user_buf, size_t count, loff_t *off) | |
407 | { | |
408 | char *buf; | |
409 | int err; | |
410 | ||
411 | if (count >= PAGE_SIZE) | |
412 | return -EINVAL; | |
413 | ||
414 | buf = (char *)__get_free_page(GFP_KERNEL); | |
415 | if (!buf) | |
416 | return -ENOMEM; | |
417 | if (copy_from_user(buf, user_buf, count)) { | |
418 | free_page((unsigned long) buf); | |
419 | return -EFAULT; | |
420 | } | |
421 | /* NULL-terminate and remove enter */ | |
422 | buf[count] = '\0'; | |
423 | strim(buf); | |
424 | ||
425 | cptype = parse_cp_type(buf, count); | |
426 | free_page((unsigned long) buf); | |
427 | ||
428 | if (cptype == NONE) | |
429 | return -EINVAL; | |
430 | ||
431 | err = lkdtm_register_cpoint(which); | |
432 | if (err < 0) | |
433 | return err; | |
434 | ||
435 | *off += count; | |
436 | ||
437 | return count; | |
438 | } | |
439 | ||
440 | /* Generic read callback that just prints out the available crash types */ | |
441 | static ssize_t lkdtm_debugfs_read(struct file *f, char __user *user_buf, | |
442 | size_t count, loff_t *off) | |
443 | { | |
444 | char *buf; | |
445 | int i, n, out; | |
446 | ||
447 | buf = (char *)__get_free_page(GFP_KERNEL); | |
448 | ||
449 | n = snprintf(buf, PAGE_SIZE, "Available crash types:\n"); | |
450 | for (i = 0; i < ARRAY_SIZE(cp_type); i++) | |
451 | n += snprintf(buf + n, PAGE_SIZE - n, "%s\n", cp_type[i]); | |
452 | buf[n] = '\0'; | |
453 | ||
454 | out = simple_read_from_buffer(user_buf, count, off, | |
455 | buf, n); | |
456 | free_page((unsigned long) buf); | |
457 | ||
458 | return out; | |
459 | } | |
460 | ||
461 | static int lkdtm_debugfs_open(struct inode *inode, struct file *file) | |
462 | { | |
463 | return 0; | |
464 | } | |
465 | ||
466 | ||
467 | static ssize_t int_hardware_entry(struct file *f, const char __user *buf, | |
468 | size_t count, loff_t *off) | |
469 | { | |
470 | return do_register_entry(INT_HARDWARE_ENTRY, f, buf, count, off); | |
471 | } | |
472 | ||
473 | static ssize_t int_hw_irq_en(struct file *f, const char __user *buf, | |
474 | size_t count, loff_t *off) | |
475 | { | |
476 | return do_register_entry(INT_HW_IRQ_EN, f, buf, count, off); | |
477 | } | |
478 | ||
479 | static ssize_t int_tasklet_entry(struct file *f, const char __user *buf, | |
480 | size_t count, loff_t *off) | |
481 | { | |
482 | return do_register_entry(INT_TASKLET_ENTRY, f, buf, count, off); | |
483 | } | |
484 | ||
485 | static ssize_t fs_devrw_entry(struct file *f, const char __user *buf, | |
486 | size_t count, loff_t *off) | |
487 | { | |
488 | return do_register_entry(FS_DEVRW, f, buf, count, off); | |
489 | } | |
490 | ||
491 | static ssize_t mem_swapout_entry(struct file *f, const char __user *buf, | |
492 | size_t count, loff_t *off) | |
493 | { | |
494 | return do_register_entry(MEM_SWAPOUT, f, buf, count, off); | |
495 | } | |
496 | ||
497 | static ssize_t timeradd_entry(struct file *f, const char __user *buf, | |
498 | size_t count, loff_t *off) | |
499 | { | |
500 | return do_register_entry(TIMERADD, f, buf, count, off); | |
501 | } | |
502 | ||
503 | static ssize_t scsi_dispatch_cmd_entry(struct file *f, | |
504 | const char __user *buf, size_t count, loff_t *off) | |
505 | { | |
506 | return do_register_entry(SCSI_DISPATCH_CMD, f, buf, count, off); | |
507 | } | |
508 | ||
509 | static ssize_t ide_core_cp_entry(struct file *f, const char __user *buf, | |
510 | size_t count, loff_t *off) | |
511 | { | |
512 | return do_register_entry(IDE_CORE_CP, f, buf, count, off); | |
513 | } | |
514 | ||
515 | /* Special entry to just crash directly. Available without KPROBEs */ | |
516 | static ssize_t direct_entry(struct file *f, const char __user *user_buf, | |
517 | size_t count, loff_t *off) | |
518 | { | |
519 | enum ctype type; | |
520 | char *buf; | |
521 | ||
522 | if (count >= PAGE_SIZE) | |
523 | return -EINVAL; | |
524 | if (count < 1) | |
525 | return -EINVAL; | |
526 | ||
527 | buf = (char *)__get_free_page(GFP_KERNEL); | |
528 | if (!buf) | |
529 | return -ENOMEM; | |
530 | if (copy_from_user(buf, user_buf, count)) { | |
531 | free_page((unsigned long) buf); | |
532 | return -EFAULT; | |
533 | } | |
534 | /* NULL-terminate and remove enter */ | |
535 | buf[count] = '\0'; | |
536 | strim(buf); | |
537 | ||
538 | type = parse_cp_type(buf, count); | |
539 | free_page((unsigned long) buf); | |
540 | if (type == NONE) | |
541 | return -EINVAL; | |
542 | ||
543 | printk(KERN_INFO "lkdtm: Performing direct entry %s\n", | |
544 | cp_type_to_str(type)); | |
545 | lkdtm_do_action(type); | |
546 | *off += count; | |
547 | ||
548 | return count; | |
549 | } | |
550 | ||
551 | struct crash_entry { | |
552 | const char *name; | |
553 | const struct file_operations fops; | |
554 | }; | |
555 | ||
556 | static const struct crash_entry crash_entries[] = { | |
557 | {"DIRECT", {.read = lkdtm_debugfs_read, | |
558 | .open = lkdtm_debugfs_open, | |
559 | .write = direct_entry} }, | |
560 | {"INT_HARDWARE_ENTRY", {.read = lkdtm_debugfs_read, | |
561 | .open = lkdtm_debugfs_open, | |
562 | .write = int_hardware_entry} }, | |
563 | {"INT_HW_IRQ_EN", {.read = lkdtm_debugfs_read, | |
564 | .open = lkdtm_debugfs_open, | |
565 | .write = int_hw_irq_en} }, | |
566 | {"INT_TASKLET_ENTRY", {.read = lkdtm_debugfs_read, | |
567 | .open = lkdtm_debugfs_open, | |
568 | .write = int_tasklet_entry} }, | |
569 | {"FS_DEVRW", {.read = lkdtm_debugfs_read, | |
570 | .open = lkdtm_debugfs_open, | |
571 | .write = fs_devrw_entry} }, | |
572 | {"MEM_SWAPOUT", {.read = lkdtm_debugfs_read, | |
573 | .open = lkdtm_debugfs_open, | |
574 | .write = mem_swapout_entry} }, | |
575 | {"TIMERADD", {.read = lkdtm_debugfs_read, | |
576 | .open = lkdtm_debugfs_open, | |
577 | .write = timeradd_entry} }, | |
578 | {"SCSI_DISPATCH_CMD", {.read = lkdtm_debugfs_read, | |
579 | .open = lkdtm_debugfs_open, | |
580 | .write = scsi_dispatch_cmd_entry} }, | |
581 | {"IDE_CORE_CP", {.read = lkdtm_debugfs_read, | |
582 | .open = lkdtm_debugfs_open, | |
583 | .write = ide_core_cp_entry} }, | |
584 | }; | |
585 | ||
586 | static struct dentry *lkdtm_debugfs_root; | |
587 | ||
588 | static int __init lkdtm_module_init(void) | |
589 | { | |
590 | int ret = -EINVAL; | |
591 | int n_debugfs_entries = 1; /* Assume only the direct entry */ | |
592 | int i; | |
593 | ||
594 | /* Register debugfs interface */ | |
595 | lkdtm_debugfs_root = debugfs_create_dir("provoke-crash", NULL); | |
596 | if (!lkdtm_debugfs_root) { | |
597 | printk(KERN_ERR "lkdtm: creating root dir failed\n"); | |
598 | return -ENODEV; | |
599 | } | |
600 | ||
601 | #ifdef CONFIG_KPROBES | |
602 | n_debugfs_entries = ARRAY_SIZE(crash_entries); | |
603 | #endif | |
604 | ||
605 | for (i = 0; i < n_debugfs_entries; i++) { | |
606 | const struct crash_entry *cur = &crash_entries[i]; | |
607 | struct dentry *de; | |
608 | ||
609 | de = debugfs_create_file(cur->name, 0644, lkdtm_debugfs_root, | |
610 | NULL, &cur->fops); | |
611 | if (de == NULL) { | |
612 | printk(KERN_ERR "lkdtm: could not create %s\n", | |
613 | cur->name); | |
614 | goto out_err; | |
615 | } | |
616 | } | |
617 | ||
618 | if (lkdtm_parse_commandline() == -EINVAL) { | |
619 | printk(KERN_INFO "lkdtm: Invalid command\n"); | |
620 | goto out_err; | |
621 | } | |
622 | ||
623 | if (cpoint != INVALID && cptype != NONE) { | |
624 | ret = lkdtm_register_cpoint(cpoint); | |
625 | if (ret < 0) { | |
626 | printk(KERN_INFO "lkdtm: Invalid crash point %d\n", | |
627 | cpoint); | |
628 | goto out_err; | |
629 | } | |
630 | printk(KERN_INFO "lkdtm: Crash point %s of type %s registered\n", | |
631 | cpoint_name, cpoint_type); | |
632 | } else { | |
633 | printk(KERN_INFO "lkdtm: No crash points registered, enable through debugfs\n"); | |
8bb31b9d AG |
634 | } |
635 | ||
8bb31b9d | 636 | return 0; |
0347af4e SK |
637 | |
638 | out_err: | |
639 | debugfs_remove_recursive(lkdtm_debugfs_root); | |
640 | return ret; | |
8bb31b9d AG |
641 | } |
642 | ||
2118116e | 643 | static void __exit lkdtm_module_exit(void) |
8bb31b9d | 644 | { |
0347af4e SK |
645 | debugfs_remove_recursive(lkdtm_debugfs_root); |
646 | ||
647 | unregister_jprobe(&lkdtm); | |
648 | printk(KERN_INFO "lkdtm: Crash point unregistered\n"); | |
8bb31b9d AG |
649 | } |
650 | ||
651 | module_init(lkdtm_module_init); | |
652 | module_exit(lkdtm_module_exit); | |
653 | ||
654 | MODULE_LICENSE("GPL"); |