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Commit | Line | Data |
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4b23aff0 RP |
1 | /* |
2 | * MTD Oops/Panic logger | |
3 | * | |
a1452a37 | 4 | * Copyright © 2007 Nokia Corporation. All rights reserved. |
4b23aff0 RP |
5 | * |
6 | * Author: Richard Purdie <rpurdie@openedhand.com> | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public License | |
10 | * version 2 as published by the Free Software Foundation. | |
11 | * | |
12 | * This program is distributed in the hope that it will be useful, but | |
13 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
15 | * General Public License for more details. | |
16 | * | |
17 | * You should have received a copy of the GNU General Public License | |
18 | * along with this program; if not, write to the Free Software | |
19 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA | |
20 | * 02110-1301 USA | |
21 | * | |
22 | */ | |
23 | ||
24 | #include <linux/kernel.h> | |
25 | #include <linux/module.h> | |
26 | #include <linux/console.h> | |
27 | #include <linux/vmalloc.h> | |
28 | #include <linux/workqueue.h> | |
29 | #include <linux/sched.h> | |
30 | #include <linux/wait.h> | |
621e4f8e | 31 | #include <linux/delay.h> |
f9f7dd22 | 32 | #include <linux/interrupt.h> |
4b23aff0 | 33 | #include <linux/mtd/mtd.h> |
2e386e4b | 34 | #include <linux/kmsg_dump.h> |
4b23aff0 | 35 | |
1114e3d0 SK |
36 | /* Maximum MTD partition size */ |
37 | #define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024) | |
38 | ||
f0482ee3 | 39 | #define MTDOOPS_KERNMSG_MAGIC 0x5d005d00 |
2e386e4b | 40 | #define MTDOOPS_HEADER_SIZE 8 |
9507b0c8 SK |
41 | |
42 | static unsigned long record_size = 4096; | |
43 | module_param(record_size, ulong, 0400); | |
44 | MODULE_PARM_DESC(record_size, | |
45 | "record size for MTD OOPS pages in bytes (default 4096)"); | |
4b23aff0 | 46 | |
2e386e4b SK |
47 | static char mtddev[80]; |
48 | module_param_string(mtddev, mtddev, 80, 0400); | |
49 | MODULE_PARM_DESC(mtddev, | |
50 | "name or index number of the MTD device to use"); | |
51 | ||
52 | static int dump_oops = 1; | |
53 | module_param(dump_oops, int, 0600); | |
54 | MODULE_PARM_DESC(dump_oops, | |
55 | "set to 1 to dump oopses, 0 to only dump panics (default 1)"); | |
56 | ||
7903cbab | 57 | static struct mtdoops_context { |
2e386e4b SK |
58 | struct kmsg_dumper dump; |
59 | ||
4b23aff0 | 60 | int mtd_index; |
6ce0a856 RP |
61 | struct work_struct work_erase; |
62 | struct work_struct work_write; | |
4b23aff0 RP |
63 | struct mtd_info *mtd; |
64 | int oops_pages; | |
65 | int nextpage; | |
66 | int nextcount; | |
be95745f | 67 | unsigned long *oops_page_used; |
4b23aff0 RP |
68 | |
69 | void *oops_buf; | |
4b23aff0 RP |
70 | } oops_cxt; |
71 | ||
be95745f SK |
72 | static void mark_page_used(struct mtdoops_context *cxt, int page) |
73 | { | |
74 | set_bit(page, cxt->oops_page_used); | |
75 | } | |
76 | ||
77 | static void mark_page_unused(struct mtdoops_context *cxt, int page) | |
78 | { | |
79 | clear_bit(page, cxt->oops_page_used); | |
80 | } | |
81 | ||
82 | static int page_is_used(struct mtdoops_context *cxt, int page) | |
83 | { | |
84 | return test_bit(page, cxt->oops_page_used); | |
85 | } | |
86 | ||
4b23aff0 RP |
87 | static void mtdoops_erase_callback(struct erase_info *done) |
88 | { | |
89 | wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv; | |
90 | wake_up(wait_q); | |
91 | } | |
92 | ||
be95745f | 93 | static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset) |
4b23aff0 | 94 | { |
be95745f SK |
95 | struct mtd_info *mtd = cxt->mtd; |
96 | u32 start_page_offset = mtd_div_by_eb(offset, mtd) * mtd->erasesize; | |
9507b0c8 SK |
97 | u32 start_page = start_page_offset / record_size; |
98 | u32 erase_pages = mtd->erasesize / record_size; | |
4b23aff0 RP |
99 | struct erase_info erase; |
100 | DECLARE_WAITQUEUE(wait, current); | |
101 | wait_queue_head_t wait_q; | |
102 | int ret; | |
be95745f | 103 | int page; |
4b23aff0 RP |
104 | |
105 | init_waitqueue_head(&wait_q); | |
106 | erase.mtd = mtd; | |
107 | erase.callback = mtdoops_erase_callback; | |
108 | erase.addr = offset; | |
79dcd8e9 | 109 | erase.len = mtd->erasesize; |
4b23aff0 RP |
110 | erase.priv = (u_long)&wait_q; |
111 | ||
112 | set_current_state(TASK_INTERRUPTIBLE); | |
113 | add_wait_queue(&wait_q, &wait); | |
114 | ||
115 | ret = mtd->erase(mtd, &erase); | |
116 | if (ret) { | |
117 | set_current_state(TASK_RUNNING); | |
118 | remove_wait_queue(&wait_q, &wait); | |
a15b124f AB |
119 | printk(KERN_WARNING "mtdoops: erase of region [0x%llx, 0x%llx] on \"%s\" failed\n", |
120 | (unsigned long long)erase.addr, | |
2e386e4b | 121 | (unsigned long long)erase.len, mtddev); |
4b23aff0 RP |
122 | return ret; |
123 | } | |
124 | ||
125 | schedule(); /* Wait for erase to finish. */ | |
126 | remove_wait_queue(&wait_q, &wait); | |
127 | ||
be95745f SK |
128 | /* Mark pages as unused */ |
129 | for (page = start_page; page < start_page + erase_pages; page++) | |
130 | mark_page_unused(cxt, page); | |
131 | ||
4b23aff0 RP |
132 | return 0; |
133 | } | |
134 | ||
6ce0a856 | 135 | static void mtdoops_inc_counter(struct mtdoops_context *cxt) |
4b23aff0 | 136 | { |
4b23aff0 | 137 | cxt->nextpage++; |
ecd5b310 | 138 | if (cxt->nextpage >= cxt->oops_pages) |
4b23aff0 RP |
139 | cxt->nextpage = 0; |
140 | cxt->nextcount++; | |
141 | if (cxt->nextcount == 0xffffffff) | |
142 | cxt->nextcount = 0; | |
143 | ||
be95745f | 144 | if (page_is_used(cxt, cxt->nextpage)) { |
6ce0a856 RP |
145 | schedule_work(&cxt->work_erase); |
146 | return; | |
147 | } | |
4b23aff0 | 148 | |
a15b124f AB |
149 | printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase)\n", |
150 | cxt->nextpage, cxt->nextcount); | |
4b23aff0 RP |
151 | } |
152 | ||
6ce0a856 RP |
153 | /* Scheduled work - when we can't proceed without erasing a block */ |
154 | static void mtdoops_workfunc_erase(struct work_struct *work) | |
4b23aff0 | 155 | { |
6ce0a856 RP |
156 | struct mtdoops_context *cxt = |
157 | container_of(work, struct mtdoops_context, work_erase); | |
4b23aff0 RP |
158 | struct mtd_info *mtd = cxt->mtd; |
159 | int i = 0, j, ret, mod; | |
160 | ||
161 | /* We were unregistered */ | |
162 | if (!mtd) | |
163 | return; | |
164 | ||
9507b0c8 | 165 | mod = (cxt->nextpage * record_size) % mtd->erasesize; |
4b23aff0 | 166 | if (mod != 0) { |
9507b0c8 | 167 | cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / record_size); |
ecd5b310 | 168 | if (cxt->nextpage >= cxt->oops_pages) |
4b23aff0 RP |
169 | cxt->nextpage = 0; |
170 | } | |
171 | ||
2986bd2a | 172 | while (mtd->block_isbad) { |
9507b0c8 | 173 | ret = mtd->block_isbad(mtd, cxt->nextpage * record_size); |
2986bd2a RP |
174 | if (!ret) |
175 | break; | |
176 | if (ret < 0) { | |
a15b124f | 177 | printk(KERN_ERR "mtdoops: block_isbad failed, aborting\n"); |
2986bd2a RP |
178 | return; |
179 | } | |
4b23aff0 | 180 | badblock: |
9507b0c8 SK |
181 | printk(KERN_WARNING "mtdoops: bad block at %08lx\n", |
182 | cxt->nextpage * record_size); | |
4b23aff0 | 183 | i++; |
9507b0c8 | 184 | cxt->nextpage = cxt->nextpage + (mtd->erasesize / record_size); |
ecd5b310 | 185 | if (cxt->nextpage >= cxt->oops_pages) |
4b23aff0 | 186 | cxt->nextpage = 0; |
9507b0c8 | 187 | if (i == cxt->oops_pages / (mtd->erasesize / record_size)) { |
a15b124f | 188 | printk(KERN_ERR "mtdoops: all blocks bad!\n"); |
4b23aff0 RP |
189 | return; |
190 | } | |
191 | } | |
192 | ||
193 | for (j = 0, ret = -1; (j < 3) && (ret < 0); j++) | |
9507b0c8 | 194 | ret = mtdoops_erase_block(cxt, cxt->nextpage * record_size); |
4b23aff0 | 195 | |
2986bd2a | 196 | if (ret >= 0) { |
a15b124f AB |
197 | printk(KERN_DEBUG "mtdoops: ready %d, %d\n", |
198 | cxt->nextpage, cxt->nextcount); | |
2986bd2a | 199 | return; |
4b23aff0 RP |
200 | } |
201 | ||
a15b124f | 202 | if (mtd->block_markbad && ret == -EIO) { |
9507b0c8 | 203 | ret = mtd->block_markbad(mtd, cxt->nextpage * record_size); |
2986bd2a | 204 | if (ret < 0) { |
a15b124f | 205 | printk(KERN_ERR "mtdoops: block_markbad failed, aborting\n"); |
2986bd2a RP |
206 | return; |
207 | } | |
208 | } | |
209 | goto badblock; | |
4b23aff0 RP |
210 | } |
211 | ||
621e4f8e | 212 | static void mtdoops_write(struct mtdoops_context *cxt, int panic) |
4b23aff0 | 213 | { |
6ce0a856 RP |
214 | struct mtd_info *mtd = cxt->mtd; |
215 | size_t retlen; | |
2e386e4b | 216 | u32 *hdr; |
6ce0a856 | 217 | int ret; |
4b23aff0 | 218 | |
2e386e4b SK |
219 | /* Add mtdoops header to the buffer */ |
220 | hdr = cxt->oops_buf; | |
221 | hdr[0] = cxt->nextcount; | |
222 | hdr[1] = MTDOOPS_KERNMSG_MAGIC; | |
6ce0a856 | 223 | |
621e4f8e | 224 | if (panic) |
9507b0c8 SK |
225 | ret = mtd->panic_write(mtd, cxt->nextpage * record_size, |
226 | record_size, &retlen, cxt->oops_buf); | |
621e4f8e | 227 | else |
9507b0c8 SK |
228 | ret = mtd->write(mtd, cxt->nextpage * record_size, |
229 | record_size, &retlen, cxt->oops_buf); | |
6ce0a856 | 230 | |
9507b0c8 SK |
231 | if (retlen != record_size || ret < 0) |
232 | printk(KERN_ERR "mtdoops: write failure at %ld (%td of %ld written), error %d\n", | |
233 | cxt->nextpage * record_size, retlen, record_size, ret); | |
be95745f | 234 | mark_page_used(cxt, cxt->nextpage); |
2e386e4b | 235 | memset(cxt->oops_buf, 0xff, record_size); |
6ce0a856 RP |
236 | |
237 | mtdoops_inc_counter(cxt); | |
621e4f8e RP |
238 | } |
239 | ||
621e4f8e RP |
240 | static void mtdoops_workfunc_write(struct work_struct *work) |
241 | { | |
242 | struct mtdoops_context *cxt = | |
243 | container_of(work, struct mtdoops_context, work_write); | |
244 | ||
245 | mtdoops_write(cxt, 0); | |
a15b124f | 246 | } |
4b23aff0 | 247 | |
6ce0a856 | 248 | static void find_next_position(struct mtdoops_context *cxt) |
4b23aff0 RP |
249 | { |
250 | struct mtd_info *mtd = cxt->mtd; | |
2986bd2a | 251 | int ret, page, maxpos = 0; |
f0482ee3 | 252 | u32 count[2], maxcount = 0xffffffff; |
4b23aff0 RP |
253 | size_t retlen; |
254 | ||
255 | for (page = 0; page < cxt->oops_pages; page++) { | |
be95745f SK |
256 | /* Assume the page is used */ |
257 | mark_page_used(cxt, page); | |
2e386e4b SK |
258 | ret = mtd->read(mtd, page * record_size, MTDOOPS_HEADER_SIZE, |
259 | &retlen, (u_char *) &count[0]); | |
260 | if (retlen != MTDOOPS_HEADER_SIZE || | |
261 | (ret < 0 && ret != -EUCLEAN)) { | |
262 | printk(KERN_ERR "mtdoops: read failure at %ld (%td of %d read), err %d\n", | |
263 | page * record_size, retlen, | |
264 | MTDOOPS_HEADER_SIZE, ret); | |
2986bd2a RP |
265 | continue; |
266 | } | |
267 | ||
be95745f SK |
268 | if (count[0] == 0xffffffff && count[1] == 0xffffffff) |
269 | mark_page_unused(cxt, page); | |
f0482ee3 | 270 | if (count[0] == 0xffffffff) |
4b23aff0 RP |
271 | continue; |
272 | if (maxcount == 0xffffffff) { | |
f0482ee3 | 273 | maxcount = count[0]; |
4b23aff0 | 274 | maxpos = page; |
a15b124f | 275 | } else if (count[0] < 0x40000000 && maxcount > 0xc0000000) { |
f0482ee3 | 276 | maxcount = count[0]; |
4b23aff0 | 277 | maxpos = page; |
a15b124f | 278 | } else if (count[0] > maxcount && count[0] < 0xc0000000) { |
f0482ee3 | 279 | maxcount = count[0]; |
4b23aff0 | 280 | maxpos = page; |
a15b124f AB |
281 | } else if (count[0] > maxcount && count[0] > 0xc0000000 |
282 | && maxcount > 0x80000000) { | |
f0482ee3 | 283 | maxcount = count[0]; |
4b23aff0 RP |
284 | maxpos = page; |
285 | } | |
286 | } | |
287 | if (maxcount == 0xffffffff) { | |
288 | cxt->nextpage = 0; | |
289 | cxt->nextcount = 1; | |
43b5693d | 290 | schedule_work(&cxt->work_erase); |
6ce0a856 | 291 | return; |
4b23aff0 RP |
292 | } |
293 | ||
294 | cxt->nextpage = maxpos; | |
295 | cxt->nextcount = maxcount; | |
296 | ||
6ce0a856 | 297 | mtdoops_inc_counter(cxt); |
4b23aff0 RP |
298 | } |
299 | ||
2e386e4b SK |
300 | static void mtdoops_do_dump(struct kmsg_dumper *dumper, |
301 | enum kmsg_dump_reason reason, const char *s1, unsigned long l1, | |
302 | const char *s2, unsigned long l2) | |
303 | { | |
304 | struct mtdoops_context *cxt = container_of(dumper, | |
305 | struct mtdoops_context, dump); | |
306 | unsigned long s1_start, s2_start; | |
307 | unsigned long l1_cpy, l2_cpy; | |
308 | char *dst; | |
309 | ||
310 | /* Only dump oopses if dump_oops is set */ | |
311 | if (reason == KMSG_DUMP_OOPS && !dump_oops) | |
312 | return; | |
313 | ||
314 | dst = cxt->oops_buf + MTDOOPS_HEADER_SIZE; /* Skip the header */ | |
315 | l2_cpy = min(l2, record_size - MTDOOPS_HEADER_SIZE); | |
316 | l1_cpy = min(l1, record_size - MTDOOPS_HEADER_SIZE - l2_cpy); | |
317 | ||
318 | s2_start = l2 - l2_cpy; | |
319 | s1_start = l1 - l1_cpy; | |
320 | ||
321 | memcpy(dst, s1 + s1_start, l1_cpy); | |
322 | memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy); | |
323 | ||
324 | /* Panics must be written immediately */ | |
0f4bd46e | 325 | if (reason != KMSG_DUMP_OOPS) { |
2e386e4b SK |
326 | if (!cxt->mtd->panic_write) |
327 | printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write\n"); | |
328 | else | |
329 | mtdoops_write(cxt, 1); | |
330 | return; | |
331 | } | |
332 | ||
333 | /* For other cases, schedule work to write it "nicely" */ | |
334 | schedule_work(&cxt->work_write); | |
335 | } | |
4b23aff0 RP |
336 | |
337 | static void mtdoops_notify_add(struct mtd_info *mtd) | |
338 | { | |
339 | struct mtdoops_context *cxt = &oops_cxt; | |
2e386e4b SK |
340 | u64 mtdoops_pages = div_u64(mtd->size, record_size); |
341 | int err; | |
4b23aff0 | 342 | |
2e386e4b | 343 | if (!strcmp(mtd->name, mtddev)) |
e2a0f25b AH |
344 | cxt->mtd_index = mtd->index; |
345 | ||
a15b124f | 346 | if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0) |
4b23aff0 RP |
347 | return; |
348 | ||
a15b124f AB |
349 | if (mtd->size < mtd->erasesize * 2) { |
350 | printk(KERN_ERR "mtdoops: MTD partition %d not big enough for mtdoops\n", | |
351 | mtd->index); | |
4b23aff0 RP |
352 | return; |
353 | } | |
9507b0c8 | 354 | if (mtd->erasesize < record_size) { |
a15b124f AB |
355 | printk(KERN_ERR "mtdoops: eraseblock size of MTD partition %d too small\n", |
356 | mtd->index); | |
79dcd8e9 RP |
357 | return; |
358 | } | |
1114e3d0 SK |
359 | if (mtd->size > MTDOOPS_MAX_MTD_SIZE) { |
360 | printk(KERN_ERR "mtdoops: mtd%d is too large (limit is %d MiB)\n", | |
361 | mtd->index, MTDOOPS_MAX_MTD_SIZE / 1024 / 1024); | |
362 | return; | |
363 | } | |
364 | ||
be95745f SK |
365 | /* oops_page_used is a bit field */ |
366 | cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages, | |
367 | BITS_PER_LONG)); | |
368 | if (!cxt->oops_page_used) { | |
2e386e4b SK |
369 | printk(KERN_ERR "mtdoops: could not allocate page array\n"); |
370 | return; | |
371 | } | |
372 | ||
373 | cxt->dump.dump = mtdoops_do_dump; | |
374 | err = kmsg_dump_register(&cxt->dump); | |
375 | if (err) { | |
376 | printk(KERN_ERR "mtdoops: registering kmsg dumper failed, error %d\n", err); | |
377 | vfree(cxt->oops_page_used); | |
378 | cxt->oops_page_used = NULL; | |
be95745f SK |
379 | return; |
380 | } | |
4b23aff0 | 381 | |
1114e3d0 | 382 | cxt->mtd = mtd; |
9507b0c8 | 383 | cxt->oops_pages = (int)mtd->size / record_size; |
6ce0a856 | 384 | find_next_position(cxt); |
79dcd8e9 | 385 | printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index); |
4b23aff0 RP |
386 | } |
387 | ||
388 | static void mtdoops_notify_remove(struct mtd_info *mtd) | |
389 | { | |
390 | struct mtdoops_context *cxt = &oops_cxt; | |
391 | ||
a15b124f | 392 | if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0) |
4b23aff0 RP |
393 | return; |
394 | ||
2e386e4b SK |
395 | if (kmsg_dump_unregister(&cxt->dump) < 0) |
396 | printk(KERN_WARNING "mtdoops: could not unregister kmsg_dumper\n"); | |
397 | ||
4b23aff0 RP |
398 | cxt->mtd = NULL; |
399 | flush_scheduled_work(); | |
400 | } | |
401 | ||
4b23aff0 RP |
402 | |
403 | static struct mtd_notifier mtdoops_notifier = { | |
404 | .add = mtdoops_notify_add, | |
405 | .remove = mtdoops_notify_remove, | |
406 | }; | |
407 | ||
2e386e4b | 408 | static int __init mtdoops_init(void) |
4b23aff0 RP |
409 | { |
410 | struct mtdoops_context *cxt = &oops_cxt; | |
2e386e4b SK |
411 | int mtd_index; |
412 | char *endp; | |
4b23aff0 | 413 | |
2e386e4b SK |
414 | if (strlen(mtddev) == 0) { |
415 | printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied\n"); | |
416 | return -EINVAL; | |
417 | } | |
9507b0c8 SK |
418 | if ((record_size & 4095) != 0) { |
419 | printk(KERN_ERR "mtdoops: record_size must be a multiple of 4096\n"); | |
420 | return -EINVAL; | |
421 | } | |
422 | if (record_size < 4096) { | |
423 | printk(KERN_ERR "mtdoops: record_size must be over 4096 bytes\n"); | |
424 | return -EINVAL; | |
425 | } | |
2e386e4b SK |
426 | |
427 | /* Setup the MTD device to use */ | |
4b23aff0 | 428 | cxt->mtd_index = -1; |
2e386e4b SK |
429 | mtd_index = simple_strtoul(mtddev, &endp, 0); |
430 | if (*endp == '\0') | |
431 | cxt->mtd_index = mtd_index; | |
2e386e4b | 432 | |
9507b0c8 | 433 | cxt->oops_buf = vmalloc(record_size); |
4b23aff0 | 434 | if (!cxt->oops_buf) { |
a15b124f | 435 | printk(KERN_ERR "mtdoops: failed to allocate buffer workspace\n"); |
4b23aff0 RP |
436 | return -ENOMEM; |
437 | } | |
2e386e4b | 438 | memset(cxt->oops_buf, 0xff, record_size); |
4b23aff0 | 439 | |
6ce0a856 RP |
440 | INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase); |
441 | INIT_WORK(&cxt->work_write, mtdoops_workfunc_write); | |
4b23aff0 | 442 | |
4b23aff0 RP |
443 | register_mtd_user(&mtdoops_notifier); |
444 | return 0; | |
445 | } | |
446 | ||
2e386e4b | 447 | static void __exit mtdoops_exit(void) |
4b23aff0 RP |
448 | { |
449 | struct mtdoops_context *cxt = &oops_cxt; | |
450 | ||
451 | unregister_mtd_user(&mtdoops_notifier); | |
4b23aff0 | 452 | vfree(cxt->oops_buf); |
be95745f | 453 | vfree(cxt->oops_page_used); |
4b23aff0 RP |
454 | } |
455 | ||
456 | ||
2e386e4b SK |
457 | module_init(mtdoops_init); |
458 | module_exit(mtdoops_exit); | |
4b23aff0 RP |
459 | |
460 | MODULE_LICENSE("GPL"); | |
461 | MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); | |
462 | MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver"); |