Blame view
drivers/mtd/mtdoops.c
11.8 KB
4b23aff08 [MTD] oops and pa... |
1 2 3 |
/* * MTD Oops/Panic logger * |
a1452a377 mtd: Update copyr... |
4 |
* Copyright © 2007 Nokia Corporation. All rights reserved. |
4b23aff08 [MTD] oops and pa... |
5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 |
* * Author: Richard Purdie <rpurdie@openedhand.com> * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License * version 2 as published by the Free Software Foundation. * * This program is distributed in the hope that it will be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA * 02110-1301 USA * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/console.h> #include <linux/vmalloc.h> #include <linux/workqueue.h> #include <linux/sched.h> #include <linux/wait.h> |
621e4f8e9 [MTD] mtdoops: Us... |
31 |
#include <linux/delay.h> |
f9f7dd222 [MTD] Fix mtdoops... |
32 |
#include <linux/interrupt.h> |
4b23aff08 [MTD] oops and pa... |
33 |
#include <linux/mtd/mtd.h> |
2e386e4ba mtd: mtdoops: ref... |
34 |
#include <linux/kmsg_dump.h> |
4b23aff08 [MTD] oops and pa... |
35 |
|
1114e3d00 mtd: mtdoops: lim... |
36 37 |
/* Maximum MTD partition size */ #define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024) |
f0482ee36 [MTD] mtdoops: Ad... |
38 |
#define MTDOOPS_KERNMSG_MAGIC 0x5d005d00 |
2e386e4ba mtd: mtdoops: ref... |
39 |
#define MTDOOPS_HEADER_SIZE 8 |
9507b0c83 mtd: mtdoops: mak... |
40 41 42 43 44 |
static unsigned long record_size = 4096; module_param(record_size, ulong, 0400); MODULE_PARM_DESC(record_size, "record size for MTD OOPS pages in bytes (default 4096)"); |
4b23aff08 [MTD] oops and pa... |
45 |
|
2e386e4ba mtd: mtdoops: ref... |
46 47 48 49 50 51 52 53 54 |
static char mtddev[80]; module_param_string(mtddev, mtddev, 80, 0400); MODULE_PARM_DESC(mtddev, "name or index number of the MTD device to use"); static int dump_oops = 1; module_param(dump_oops, int, 0600); MODULE_PARM_DESC(dump_oops, "set to 1 to dump oopses, 0 to only dump panics (default 1)"); |
7903cbabc [MTD] mtdoops.c: ... |
55 |
static struct mtdoops_context { |
2e386e4ba mtd: mtdoops: ref... |
56 |
struct kmsg_dumper dump; |
4b23aff08 [MTD] oops and pa... |
57 |
int mtd_index; |
6ce0a856c [MTD] mtdoops: Pe... |
58 59 |
struct work_struct work_erase; struct work_struct work_write; |
4b23aff08 [MTD] oops and pa... |
60 61 62 63 |
struct mtd_info *mtd; int oops_pages; int nextpage; int nextcount; |
be95745f0 mtd: mtdoops: kee... |
64 |
unsigned long *oops_page_used; |
4b23aff08 [MTD] oops and pa... |
65 66 |
void *oops_buf; |
4b23aff08 [MTD] oops and pa... |
67 |
} oops_cxt; |
be95745f0 mtd: mtdoops: kee... |
68 69 70 71 72 73 74 75 76 77 78 79 80 81 |
static void mark_page_used(struct mtdoops_context *cxt, int page) { set_bit(page, cxt->oops_page_used); } static void mark_page_unused(struct mtdoops_context *cxt, int page) { clear_bit(page, cxt->oops_page_used); } static int page_is_used(struct mtdoops_context *cxt, int page) { return test_bit(page, cxt->oops_page_used); } |
4b23aff08 [MTD] oops and pa... |
82 83 84 85 86 |
static void mtdoops_erase_callback(struct erase_info *done) { wait_queue_head_t *wait_q = (wait_queue_head_t *)done->priv; wake_up(wait_q); } |
be95745f0 mtd: mtdoops: kee... |
87 |
static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset) |
4b23aff08 [MTD] oops and pa... |
88 |
{ |
be95745f0 mtd: mtdoops: kee... |
89 90 |
struct mtd_info *mtd = cxt->mtd; u32 start_page_offset = mtd_div_by_eb(offset, mtd) * mtd->erasesize; |
9507b0c83 mtd: mtdoops: mak... |
91 92 |
u32 start_page = start_page_offset / record_size; u32 erase_pages = mtd->erasesize / record_size; |
4b23aff08 [MTD] oops and pa... |
93 94 95 96 |
struct erase_info erase; DECLARE_WAITQUEUE(wait, current); wait_queue_head_t wait_q; int ret; |
be95745f0 mtd: mtdoops: kee... |
97 |
int page; |
4b23aff08 [MTD] oops and pa... |
98 99 100 101 102 |
init_waitqueue_head(&wait_q); erase.mtd = mtd; erase.callback = mtdoops_erase_callback; erase.addr = offset; |
79dcd8e9e [MTD] mtdoops: Va... |
103 |
erase.len = mtd->erasesize; |
4b23aff08 [MTD] oops and pa... |
104 105 106 107 |
erase.priv = (u_long)&wait_q; set_current_state(TASK_INTERRUPTIBLE); add_wait_queue(&wait_q, &wait); |
7e1f0dc05 mtd: introduce mt... |
108 |
ret = mtd_erase(mtd, &erase); |
4b23aff08 [MTD] oops and pa... |
109 110 111 |
if (ret) { set_current_state(TASK_RUNNING); remove_wait_queue(&wait_q, &wait); |
a15b124fc mtd: mtdoops: sev... |
112 113 114 |
printk(KERN_WARNING "mtdoops: erase of region [0x%llx, 0x%llx] on \"%s\" failed ", (unsigned long long)erase.addr, |
2e386e4ba mtd: mtdoops: ref... |
115 |
(unsigned long long)erase.len, mtddev); |
4b23aff08 [MTD] oops and pa... |
116 117 118 119 120 |
return ret; } schedule(); /* Wait for erase to finish. */ remove_wait_queue(&wait_q, &wait); |
be95745f0 mtd: mtdoops: kee... |
121 122 123 |
/* Mark pages as unused */ for (page = start_page; page < start_page + erase_pages; page++) mark_page_unused(cxt, page); |
4b23aff08 [MTD] oops and pa... |
124 125 |
return 0; } |
6ce0a856c [MTD] mtdoops: Pe... |
126 |
static void mtdoops_inc_counter(struct mtdoops_context *cxt) |
4b23aff08 [MTD] oops and pa... |
127 |
{ |
4b23aff08 [MTD] oops and pa... |
128 |
cxt->nextpage++; |
ecd5b3102 [MTD] mtdoops: Fi... |
129 |
if (cxt->nextpage >= cxt->oops_pages) |
4b23aff08 [MTD] oops and pa... |
130 131 132 133 |
cxt->nextpage = 0; cxt->nextcount++; if (cxt->nextcount == 0xffffffff) cxt->nextcount = 0; |
be95745f0 mtd: mtdoops: kee... |
134 |
if (page_is_used(cxt, cxt->nextpage)) { |
6ce0a856c [MTD] mtdoops: Pe... |
135 136 137 |
schedule_work(&cxt->work_erase); return; } |
4b23aff08 [MTD] oops and pa... |
138 |
|
a15b124fc mtd: mtdoops: sev... |
139 140 141 |
printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase) ", cxt->nextpage, cxt->nextcount); |
4b23aff08 [MTD] oops and pa... |
142 |
} |
6ce0a856c [MTD] mtdoops: Pe... |
143 144 |
/* Scheduled work - when we can't proceed without erasing a block */ static void mtdoops_workfunc_erase(struct work_struct *work) |
4b23aff08 [MTD] oops and pa... |
145 |
{ |
6ce0a856c [MTD] mtdoops: Pe... |
146 147 |
struct mtdoops_context *cxt = container_of(work, struct mtdoops_context, work_erase); |
4b23aff08 [MTD] oops and pa... |
148 149 150 151 152 153 |
struct mtd_info *mtd = cxt->mtd; int i = 0, j, ret, mod; /* We were unregistered */ if (!mtd) return; |
9507b0c83 mtd: mtdoops: mak... |
154 |
mod = (cxt->nextpage * record_size) % mtd->erasesize; |
4b23aff08 [MTD] oops and pa... |
155 |
if (mod != 0) { |
9507b0c83 mtd: mtdoops: mak... |
156 |
cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / record_size); |
ecd5b3102 [MTD] mtdoops: Fi... |
157 |
if (cxt->nextpage >= cxt->oops_pages) |
4b23aff08 [MTD] oops and pa... |
158 159 |
cxt->nextpage = 0; } |
9cb93fbb5 mtd: mtdoops: ref... |
160 |
while ((ret = mtd_block_isbad(mtd, cxt->nextpage * record_size)) > 0) { |
4b23aff08 [MTD] oops and pa... |
161 |
badblock: |
9507b0c83 mtd: mtdoops: mak... |
162 163 164 |
printk(KERN_WARNING "mtdoops: bad block at %08lx ", cxt->nextpage * record_size); |
4b23aff08 [MTD] oops and pa... |
165 |
i++; |
9507b0c83 mtd: mtdoops: mak... |
166 |
cxt->nextpage = cxt->nextpage + (mtd->erasesize / record_size); |
ecd5b3102 [MTD] mtdoops: Fi... |
167 |
if (cxt->nextpage >= cxt->oops_pages) |
4b23aff08 [MTD] oops and pa... |
168 |
cxt->nextpage = 0; |
9507b0c83 mtd: mtdoops: mak... |
169 |
if (i == cxt->oops_pages / (mtd->erasesize / record_size)) { |
a15b124fc mtd: mtdoops: sev... |
170 171 |
printk(KERN_ERR "mtdoops: all blocks bad! "); |
4b23aff08 [MTD] oops and pa... |
172 173 174 |
return; } } |
9cb93fbb5 mtd: mtdoops: ref... |
175 176 177 178 179 |
if (ret < 0) { printk(KERN_ERR "mtdoops: mtd_block_isbad failed, aborting "); return; } |
4b23aff08 [MTD] oops and pa... |
180 |
for (j = 0, ret = -1; (j < 3) && (ret < 0); j++) |
9507b0c83 mtd: mtdoops: mak... |
181 |
ret = mtdoops_erase_block(cxt, cxt->nextpage * record_size); |
4b23aff08 [MTD] oops and pa... |
182 |
|
2986bd2a3 [MTD] mtdoops: Ad... |
183 |
if (ret >= 0) { |
a15b124fc mtd: mtdoops: sev... |
184 185 186 |
printk(KERN_DEBUG "mtdoops: ready %d, %d ", cxt->nextpage, cxt->nextcount); |
2986bd2a3 [MTD] mtdoops: Ad... |
187 |
return; |
4b23aff08 [MTD] oops and pa... |
188 |
} |
bb4a09866 mtdoops: clean-up... |
189 |
if (ret == -EIO) { |
5942ddbc5 mtd: introduce mt... |
190 |
ret = mtd_block_markbad(mtd, cxt->nextpage * record_size); |
bb4a09866 mtdoops: clean-up... |
191 |
if (ret < 0 && ret != -EOPNOTSUPP) { |
a15b124fc mtd: mtdoops: sev... |
192 193 |
printk(KERN_ERR "mtdoops: block_markbad failed, aborting "); |
2986bd2a3 [MTD] mtdoops: Ad... |
194 195 196 197 |
return; } } goto badblock; |
4b23aff08 [MTD] oops and pa... |
198 |
} |
621e4f8e9 [MTD] mtdoops: Us... |
199 |
static void mtdoops_write(struct mtdoops_context *cxt, int panic) |
4b23aff08 [MTD] oops and pa... |
200 |
{ |
6ce0a856c [MTD] mtdoops: Pe... |
201 202 |
struct mtd_info *mtd = cxt->mtd; size_t retlen; |
2e386e4ba mtd: mtdoops: ref... |
203 |
u32 *hdr; |
6ce0a856c [MTD] mtdoops: Pe... |
204 |
int ret; |
4b23aff08 [MTD] oops and pa... |
205 |
|
2e386e4ba mtd: mtdoops: ref... |
206 207 208 209 |
/* Add mtdoops header to the buffer */ hdr = cxt->oops_buf; hdr[0] = cxt->nextcount; hdr[1] = MTDOOPS_KERNMSG_MAGIC; |
6ce0a856c [MTD] mtdoops: Pe... |
210 |
|
016c1291c mtd: mtdoops: do ... |
211 |
if (panic) { |
7ae79d7ff mtd: introduce mt... |
212 213 |
ret = mtd_panic_write(mtd, cxt->nextpage * record_size, record_size, &retlen, cxt->oops_buf); |
016c1291c mtd: mtdoops: do ... |
214 215 216 217 218 219 |
if (ret == -EOPNOTSUPP) { printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write "); return; } } else |
eda95cbf7 mtd: introduce mt... |
220 221 |
ret = mtd_write(mtd, cxt->nextpage * record_size, record_size, &retlen, cxt->oops_buf); |
6ce0a856c [MTD] mtdoops: Pe... |
222 |
|
9507b0c83 mtd: mtdoops: mak... |
223 224 225 226 |
if (retlen != record_size || ret < 0) printk(KERN_ERR "mtdoops: write failure at %ld (%td of %ld written), error %d ", cxt->nextpage * record_size, retlen, record_size, ret); |
be95745f0 mtd: mtdoops: kee... |
227 |
mark_page_used(cxt, cxt->nextpage); |
2e386e4ba mtd: mtdoops: ref... |
228 |
memset(cxt->oops_buf, 0xff, record_size); |
6ce0a856c [MTD] mtdoops: Pe... |
229 230 |
mtdoops_inc_counter(cxt); |
621e4f8e9 [MTD] mtdoops: Us... |
231 |
} |
621e4f8e9 [MTD] mtdoops: Us... |
232 233 234 235 236 237 |
static void mtdoops_workfunc_write(struct work_struct *work) { struct mtdoops_context *cxt = container_of(work, struct mtdoops_context, work_write); mtdoops_write(cxt, 0); |
a15b124fc mtd: mtdoops: sev... |
238 |
} |
4b23aff08 [MTD] oops and pa... |
239 |
|
6ce0a856c [MTD] mtdoops: Pe... |
240 |
static void find_next_position(struct mtdoops_context *cxt) |
4b23aff08 [MTD] oops and pa... |
241 242 |
{ struct mtd_info *mtd = cxt->mtd; |
2986bd2a3 [MTD] mtdoops: Ad... |
243 |
int ret, page, maxpos = 0; |
f0482ee36 [MTD] mtdoops: Ad... |
244 |
u32 count[2], maxcount = 0xffffffff; |
4b23aff08 [MTD] oops and pa... |
245 246 247 |
size_t retlen; for (page = 0; page < cxt->oops_pages; page++) { |
bb4a09866 mtdoops: clean-up... |
248 |
if (mtd_block_isbad(mtd, page * record_size)) |
3538c5632 mtd: mtdoops: ski... |
249 |
continue; |
be95745f0 mtd: mtdoops: kee... |
250 251 |
/* Assume the page is used */ mark_page_used(cxt, page); |
329ad399a mtd: introduce mt... |
252 253 |
ret = mtd_read(mtd, page * record_size, MTDOOPS_HEADER_SIZE, &retlen, (u_char *)&count[0]); |
2e386e4ba mtd: mtdoops: ref... |
254 |
if (retlen != MTDOOPS_HEADER_SIZE || |
d57f40544 mtd: utilize `mtd... |
255 |
(ret < 0 && !mtd_is_bitflip(ret))) { |
2e386e4ba mtd: mtdoops: ref... |
256 257 258 259 |
printk(KERN_ERR "mtdoops: read failure at %ld (%td of %d read), err %d ", page * record_size, retlen, MTDOOPS_HEADER_SIZE, ret); |
2986bd2a3 [MTD] mtdoops: Ad... |
260 261 |
continue; } |
be95745f0 mtd: mtdoops: kee... |
262 263 |
if (count[0] == 0xffffffff && count[1] == 0xffffffff) mark_page_unused(cxt, page); |
cd409c612 mtdoops: don't er... |
264 |
if (count[0] == 0xffffffff || count[1] != MTDOOPS_KERNMSG_MAGIC) |
4b23aff08 [MTD] oops and pa... |
265 266 |
continue; if (maxcount == 0xffffffff) { |
f0482ee36 [MTD] mtdoops: Ad... |
267 |
maxcount = count[0]; |
4b23aff08 [MTD] oops and pa... |
268 |
maxpos = page; |
a15b124fc mtd: mtdoops: sev... |
269 |
} else if (count[0] < 0x40000000 && maxcount > 0xc0000000) { |
f0482ee36 [MTD] mtdoops: Ad... |
270 |
maxcount = count[0]; |
4b23aff08 [MTD] oops and pa... |
271 |
maxpos = page; |
a15b124fc mtd: mtdoops: sev... |
272 |
} else if (count[0] > maxcount && count[0] < 0xc0000000) { |
f0482ee36 [MTD] mtdoops: Ad... |
273 |
maxcount = count[0]; |
4b23aff08 [MTD] oops and pa... |
274 |
maxpos = page; |
a15b124fc mtd: mtdoops: sev... |
275 276 |
} else if (count[0] > maxcount && count[0] > 0xc0000000 && maxcount > 0x80000000) { |
f0482ee36 [MTD] mtdoops: Ad... |
277 |
maxcount = count[0]; |
4b23aff08 [MTD] oops and pa... |
278 279 280 281 |
maxpos = page; } } if (maxcount == 0xffffffff) { |
cd409c612 mtdoops: don't er... |
282 283 284 285 286 287 |
cxt->nextpage = cxt->oops_pages - 1; cxt->nextcount = 0; } else { cxt->nextpage = maxpos; cxt->nextcount = maxcount; |
4b23aff08 [MTD] oops and pa... |
288 |
} |
4b23aff08 [MTD] oops and pa... |
289 |
|
6ce0a856c [MTD] mtdoops: Pe... |
290 |
mtdoops_inc_counter(cxt); |
4b23aff08 [MTD] oops and pa... |
291 |
} |
2e386e4ba mtd: mtdoops: ref... |
292 |
static void mtdoops_do_dump(struct kmsg_dumper *dumper, |
e2ae715d6 kmsg - kmsg_dump(... |
293 |
enum kmsg_dump_reason reason) |
2e386e4ba mtd: mtdoops: ref... |
294 295 296 |
{ struct mtdoops_context *cxt = container_of(dumper, struct mtdoops_context, dump); |
fc2d557c7 kmsg_dump: constr... |
297 |
|
2e386e4ba mtd: mtdoops: ref... |
298 299 300 |
/* Only dump oopses if dump_oops is set */ if (reason == KMSG_DUMP_OOPS && !dump_oops) return; |
e2ae715d6 kmsg - kmsg_dump(... |
301 302 |
kmsg_dump_get_buffer(dumper, true, cxt->oops_buf + MTDOOPS_HEADER_SIZE, record_size - MTDOOPS_HEADER_SIZE, NULL); |
2e386e4ba mtd: mtdoops: ref... |
303 304 |
/* Panics must be written immediately */ |
016c1291c mtd: mtdoops: do ... |
305 306 |
if (reason != KMSG_DUMP_OOPS) mtdoops_write(cxt, 1); |
2e386e4ba mtd: mtdoops: ref... |
307 308 309 310 |
/* For other cases, schedule work to write it "nicely" */ schedule_work(&cxt->work_write); } |
4b23aff08 [MTD] oops and pa... |
311 312 313 314 |
static void mtdoops_notify_add(struct mtd_info *mtd) { struct mtdoops_context *cxt = &oops_cxt; |
2e386e4ba mtd: mtdoops: ref... |
315 316 |
u64 mtdoops_pages = div_u64(mtd->size, record_size); int err; |
4b23aff08 [MTD] oops and pa... |
317 |
|
2e386e4ba mtd: mtdoops: ref... |
318 |
if (!strcmp(mtd->name, mtddev)) |
e2a0f25b4 [MTD] mtdoops: al... |
319 |
cxt->mtd_index = mtd->index; |
a15b124fc mtd: mtdoops: sev... |
320 |
if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0) |
4b23aff08 [MTD] oops and pa... |
321 |
return; |
a15b124fc mtd: mtdoops: sev... |
322 323 324 325 |
if (mtd->size < mtd->erasesize * 2) { printk(KERN_ERR "mtdoops: MTD partition %d not big enough for mtdoops ", mtd->index); |
4b23aff08 [MTD] oops and pa... |
326 327 |
return; } |
9507b0c83 mtd: mtdoops: mak... |
328 |
if (mtd->erasesize < record_size) { |
a15b124fc mtd: mtdoops: sev... |
329 330 331 |
printk(KERN_ERR "mtdoops: eraseblock size of MTD partition %d too small ", mtd->index); |
79dcd8e9e [MTD] mtdoops: Va... |
332 333 |
return; } |
1114e3d00 mtd: mtdoops: lim... |
334 335 336 337 338 339 |
if (mtd->size > MTDOOPS_MAX_MTD_SIZE) { printk(KERN_ERR "mtdoops: mtd%d is too large (limit is %d MiB) ", mtd->index, MTDOOPS_MAX_MTD_SIZE / 1024 / 1024); return; } |
be95745f0 mtd: mtdoops: kee... |
340 341 |
/* oops_page_used is a bit field */ cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages, |
556f06358 mtdoops: fix the ... |
342 |
BITS_PER_LONG) * sizeof(unsigned long)); |
be95745f0 mtd: mtdoops: kee... |
343 |
if (!cxt->oops_page_used) { |
2e386e4ba mtd: mtdoops: ref... |
344 345 346 347 |
printk(KERN_ERR "mtdoops: could not allocate page array "); return; } |
e2ae715d6 kmsg - kmsg_dump(... |
348 |
cxt->dump.max_reason = KMSG_DUMP_OOPS; |
2e386e4ba mtd: mtdoops: ref... |
349 350 351 352 353 354 355 |
cxt->dump.dump = mtdoops_do_dump; err = kmsg_dump_register(&cxt->dump); if (err) { printk(KERN_ERR "mtdoops: registering kmsg dumper failed, error %d ", err); vfree(cxt->oops_page_used); cxt->oops_page_used = NULL; |
be95745f0 mtd: mtdoops: kee... |
356 357 |
return; } |
4b23aff08 [MTD] oops and pa... |
358 |
|
1114e3d00 mtd: mtdoops: lim... |
359 |
cxt->mtd = mtd; |
9507b0c83 mtd: mtdoops: mak... |
360 |
cxt->oops_pages = (int)mtd->size / record_size; |
6ce0a856c [MTD] mtdoops: Pe... |
361 |
find_next_position(cxt); |
79dcd8e9e [MTD] mtdoops: Va... |
362 363 |
printk(KERN_INFO "mtdoops: Attached to MTD device %d ", mtd->index); |
4b23aff08 [MTD] oops and pa... |
364 365 366 367 368 |
} static void mtdoops_notify_remove(struct mtd_info *mtd) { struct mtdoops_context *cxt = &oops_cxt; |
a15b124fc mtd: mtdoops: sev... |
369 |
if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0) |
4b23aff08 [MTD] oops and pa... |
370 |
return; |
2e386e4ba mtd: mtdoops: ref... |
371 372 373 |
if (kmsg_dump_unregister(&cxt->dump) < 0) printk(KERN_WARNING "mtdoops: could not unregister kmsg_dumper "); |
4b23aff08 [MTD] oops and pa... |
374 |
cxt->mtd = NULL; |
43829731d workqueue: deprec... |
375 376 |
flush_work(&cxt->work_erase); flush_work(&cxt->work_write); |
4b23aff08 [MTD] oops and pa... |
377 |
} |
4b23aff08 [MTD] oops and pa... |
378 379 380 381 382 |
static struct mtd_notifier mtdoops_notifier = { .add = mtdoops_notify_add, .remove = mtdoops_notify_remove, }; |
2e386e4ba mtd: mtdoops: ref... |
383 |
static int __init mtdoops_init(void) |
4b23aff08 [MTD] oops and pa... |
384 385 |
{ struct mtdoops_context *cxt = &oops_cxt; |
2e386e4ba mtd: mtdoops: ref... |
386 387 |
int mtd_index; char *endp; |
4b23aff08 [MTD] oops and pa... |
388 |
|
2e386e4ba mtd: mtdoops: ref... |
389 390 391 392 393 |
if (strlen(mtddev) == 0) { printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied "); return -EINVAL; } |
9507b0c83 mtd: mtdoops: mak... |
394 395 396 397 398 399 400 401 402 403 |
if ((record_size & 4095) != 0) { printk(KERN_ERR "mtdoops: record_size must be a multiple of 4096 "); return -EINVAL; } if (record_size < 4096) { printk(KERN_ERR "mtdoops: record_size must be over 4096 bytes "); return -EINVAL; } |
2e386e4ba mtd: mtdoops: ref... |
404 405 |
/* Setup the MTD device to use */ |
4b23aff08 [MTD] oops and pa... |
406 |
cxt->mtd_index = -1; |
2e386e4ba mtd: mtdoops: ref... |
407 408 409 |
mtd_index = simple_strtoul(mtddev, &endp, 0); if (*endp == '\0') cxt->mtd_index = mtd_index; |
2e386e4ba mtd: mtdoops: ref... |
410 |
|
9507b0c83 mtd: mtdoops: mak... |
411 |
cxt->oops_buf = vmalloc(record_size); |
4b23aff08 [MTD] oops and pa... |
412 |
if (!cxt->oops_buf) { |
a15b124fc mtd: mtdoops: sev... |
413 414 |
printk(KERN_ERR "mtdoops: failed to allocate buffer workspace "); |
4b23aff08 [MTD] oops and pa... |
415 416 |
return -ENOMEM; } |
2e386e4ba mtd: mtdoops: ref... |
417 |
memset(cxt->oops_buf, 0xff, record_size); |
4b23aff08 [MTD] oops and pa... |
418 |
|
6ce0a856c [MTD] mtdoops: Pe... |
419 420 |
INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase); INIT_WORK(&cxt->work_write, mtdoops_workfunc_write); |
4b23aff08 [MTD] oops and pa... |
421 |
|
4b23aff08 [MTD] oops and pa... |
422 423 424 |
register_mtd_user(&mtdoops_notifier); return 0; } |
2e386e4ba mtd: mtdoops: ref... |
425 |
static void __exit mtdoops_exit(void) |
4b23aff08 [MTD] oops and pa... |
426 427 428 429 |
{ struct mtdoops_context *cxt = &oops_cxt; unregister_mtd_user(&mtdoops_notifier); |
4b23aff08 [MTD] oops and pa... |
430 |
vfree(cxt->oops_buf); |
be95745f0 mtd: mtdoops: kee... |
431 |
vfree(cxt->oops_page_used); |
4b23aff08 [MTD] oops and pa... |
432 |
} |
2e386e4ba mtd: mtdoops: ref... |
433 434 |
module_init(mtdoops_init); module_exit(mtdoops_exit); |
4b23aff08 [MTD] oops and pa... |
435 436 437 438 |
MODULE_LICENSE("GPL"); MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>"); MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver"); |