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Richard Purdie4b23aff2007-05-29 13:31:42 +01001/*
2 * MTD Oops/Panic logger
3 *
David Woodhousea1452a32010-08-08 20:58:20 +01004 * Copyright © 2007 Nokia Corporation. All rights reserved.
Richard Purdie4b23aff2007-05-29 13:31:42 +01005 *
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>
Richard Purdie621e4f82008-02-06 10:17:50 +000031#include <linux/delay.h>
David Woodhousef9f7dd22008-02-07 10:50:57 +000032#include <linux/interrupt.h>
Richard Purdie4b23aff2007-05-29 13:31:42 +010033#include <linux/mtd/mtd.h>
Simon Kagstrom2e386e42009-11-03 14:19:03 +010034#include <linux/kmsg_dump.h>
Richard Purdie4b23aff2007-05-29 13:31:42 +010035
Simon Kagstrom1114e3d2009-11-03 08:08:41 +020036/* Maximum MTD partition size */
37#define MTDOOPS_MAX_MTD_SIZE (8 * 1024 * 1024)
38
Richard Purdief0482ee2008-07-26 09:22:45 +010039#define MTDOOPS_KERNMSG_MAGIC 0x5d005d00
Simon Kagstrom2e386e42009-11-03 14:19:03 +010040#define MTDOOPS_HEADER_SIZE 8
Simon Kagstrom9507b0c2009-10-29 13:41:19 +010041
42static unsigned long record_size = 4096;
43module_param(record_size, ulong, 0400);
44MODULE_PARM_DESC(record_size,
45 "record size for MTD OOPS pages in bytes (default 4096)");
Richard Purdie4b23aff2007-05-29 13:31:42 +010046
Simon Kagstrom2e386e42009-11-03 14:19:03 +010047static char mtddev[80];
48module_param_string(mtddev, mtddev, 80, 0400);
49MODULE_PARM_DESC(mtddev,
50 "name or index number of the MTD device to use");
51
52static int dump_oops = 1;
53module_param(dump_oops, int, 0600);
54MODULE_PARM_DESC(dump_oops,
55 "set to 1 to dump oopses, 0 to only dump panics (default 1)");
56
Adrian Bunk7903cba2008-04-18 13:44:11 -070057static struct mtdoops_context {
Simon Kagstrom2e386e42009-11-03 14:19:03 +010058 struct kmsg_dumper dump;
59
Richard Purdie4b23aff2007-05-29 13:31:42 +010060 int mtd_index;
Richard Purdie6ce0a852008-01-29 11:27:11 +000061 struct work_struct work_erase;
62 struct work_struct work_write;
Richard Purdie4b23aff2007-05-29 13:31:42 +010063 struct mtd_info *mtd;
64 int oops_pages;
65 int nextpage;
66 int nextcount;
Simon Kagstrombe957452009-10-29 13:41:11 +010067 unsigned long *oops_page_used;
Richard Purdie4b23aff2007-05-29 13:31:42 +010068
69 void *oops_buf;
Richard Purdie4b23aff2007-05-29 13:31:42 +010070} oops_cxt;
71
Simon Kagstrombe957452009-10-29 13:41:11 +010072static void mark_page_used(struct mtdoops_context *cxt, int page)
73{
74 set_bit(page, cxt->oops_page_used);
75}
76
77static void mark_page_unused(struct mtdoops_context *cxt, int page)
78{
79 clear_bit(page, cxt->oops_page_used);
80}
81
82static int page_is_used(struct mtdoops_context *cxt, int page)
83{
84 return test_bit(page, cxt->oops_page_used);
85}
86
Richard Purdie4b23aff2007-05-29 13:31:42 +010087static 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
Simon Kagstrombe957452009-10-29 13:41:11 +010093static int mtdoops_erase_block(struct mtdoops_context *cxt, int offset)
Richard Purdie4b23aff2007-05-29 13:31:42 +010094{
Simon Kagstrombe957452009-10-29 13:41:11 +010095 struct mtd_info *mtd = cxt->mtd;
96 u32 start_page_offset = mtd_div_by_eb(offset, mtd) * mtd->erasesize;
Simon Kagstrom9507b0c2009-10-29 13:41:19 +010097 u32 start_page = start_page_offset / record_size;
98 u32 erase_pages = mtd->erasesize / record_size;
Richard Purdie4b23aff2007-05-29 13:31:42 +010099 struct erase_info erase;
100 DECLARE_WAITQUEUE(wait, current);
101 wait_queue_head_t wait_q;
102 int ret;
Simon Kagstrombe957452009-10-29 13:41:11 +0100103 int page;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100104
105 init_waitqueue_head(&wait_q);
106 erase.mtd = mtd;
107 erase.callback = mtdoops_erase_callback;
108 erase.addr = offset;
Richard Purdie79dcd8e2008-01-29 10:25:55 +0000109 erase.len = mtd->erasesize;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100110 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);
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300119 printk(KERN_WARNING "mtdoops: erase of region [0x%llx, 0x%llx] on \"%s\" failed\n",
120 (unsigned long long)erase.addr,
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100121 (unsigned long long)erase.len, mtddev);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100122 return ret;
123 }
124
125 schedule(); /* Wait for erase to finish. */
126 remove_wait_queue(&wait_q, &wait);
127
Simon Kagstrombe957452009-10-29 13:41:11 +0100128 /* Mark pages as unused */
129 for (page = start_page; page < start_page + erase_pages; page++)
130 mark_page_unused(cxt, page);
131
Richard Purdie4b23aff2007-05-29 13:31:42 +0100132 return 0;
133}
134
Richard Purdie6ce0a852008-01-29 11:27:11 +0000135static void mtdoops_inc_counter(struct mtdoops_context *cxt)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100136{
Richard Purdie4b23aff2007-05-29 13:31:42 +0100137 cxt->nextpage++;
Richard Purdieecd5b312008-07-26 09:17:41 +0100138 if (cxt->nextpage >= cxt->oops_pages)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100139 cxt->nextpage = 0;
140 cxt->nextcount++;
141 if (cxt->nextcount == 0xffffffff)
142 cxt->nextcount = 0;
143
Simon Kagstrombe957452009-10-29 13:41:11 +0100144 if (page_is_used(cxt, cxt->nextpage)) {
Richard Purdie6ce0a852008-01-29 11:27:11 +0000145 schedule_work(&cxt->work_erase);
146 return;
147 }
Richard Purdie4b23aff2007-05-29 13:31:42 +0100148
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300149 printk(KERN_DEBUG "mtdoops: ready %d, %d (no erase)\n",
150 cxt->nextpage, cxt->nextcount);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100151}
152
Richard Purdie6ce0a852008-01-29 11:27:11 +0000153/* Scheduled work - when we can't proceed without erasing a block */
154static void mtdoops_workfunc_erase(struct work_struct *work)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100155{
Richard Purdie6ce0a852008-01-29 11:27:11 +0000156 struct mtdoops_context *cxt =
157 container_of(work, struct mtdoops_context, work_erase);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100158 struct mtd_info *mtd = cxt->mtd;
159 int i = 0, j, ret, mod;
160
161 /* We were unregistered */
162 if (!mtd)
163 return;
164
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100165 mod = (cxt->nextpage * record_size) % mtd->erasesize;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100166 if (mod != 0) {
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100167 cxt->nextpage = cxt->nextpage + ((mtd->erasesize - mod) / record_size);
Richard Purdieecd5b312008-07-26 09:17:41 +0100168 if (cxt->nextpage >= cxt->oops_pages)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100169 cxt->nextpage = 0;
170 }
171
Richard Purdie2986bd22008-01-29 11:27:09 +0000172 while (mtd->block_isbad) {
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100173 ret = mtd->block_isbad(mtd, cxt->nextpage * record_size);
Richard Purdie2986bd22008-01-29 11:27:09 +0000174 if (!ret)
175 break;
176 if (ret < 0) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300177 printk(KERN_ERR "mtdoops: block_isbad failed, aborting\n");
Richard Purdie2986bd22008-01-29 11:27:09 +0000178 return;
179 }
Richard Purdie4b23aff2007-05-29 13:31:42 +0100180badblock:
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100181 printk(KERN_WARNING "mtdoops: bad block at %08lx\n",
182 cxt->nextpage * record_size);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100183 i++;
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100184 cxt->nextpage = cxt->nextpage + (mtd->erasesize / record_size);
Richard Purdieecd5b312008-07-26 09:17:41 +0100185 if (cxt->nextpage >= cxt->oops_pages)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100186 cxt->nextpage = 0;
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100187 if (i == cxt->oops_pages / (mtd->erasesize / record_size)) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300188 printk(KERN_ERR "mtdoops: all blocks bad!\n");
Richard Purdie4b23aff2007-05-29 13:31:42 +0100189 return;
190 }
191 }
192
193 for (j = 0, ret = -1; (j < 3) && (ret < 0); j++)
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100194 ret = mtdoops_erase_block(cxt, cxt->nextpage * record_size);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100195
Richard Purdie2986bd22008-01-29 11:27:09 +0000196 if (ret >= 0) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300197 printk(KERN_DEBUG "mtdoops: ready %d, %d\n",
198 cxt->nextpage, cxt->nextcount);
Richard Purdie2986bd22008-01-29 11:27:09 +0000199 return;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100200 }
201
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300202 if (mtd->block_markbad && ret == -EIO) {
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100203 ret = mtd->block_markbad(mtd, cxt->nextpage * record_size);
Richard Purdie2986bd22008-01-29 11:27:09 +0000204 if (ret < 0) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300205 printk(KERN_ERR "mtdoops: block_markbad failed, aborting\n");
Richard Purdie2986bd22008-01-29 11:27:09 +0000206 return;
207 }
208 }
209 goto badblock;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100210}
211
Richard Purdie621e4f82008-02-06 10:17:50 +0000212static void mtdoops_write(struct mtdoops_context *cxt, int panic)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100213{
Richard Purdie6ce0a852008-01-29 11:27:11 +0000214 struct mtd_info *mtd = cxt->mtd;
215 size_t retlen;
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100216 u32 *hdr;
Richard Purdie6ce0a852008-01-29 11:27:11 +0000217 int ret;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100218
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100219 /* Add mtdoops header to the buffer */
220 hdr = cxt->oops_buf;
221 hdr[0] = cxt->nextcount;
222 hdr[1] = MTDOOPS_KERNMSG_MAGIC;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100223
Richard Purdie621e4f82008-02-06 10:17:50 +0000224 if (panic)
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100225 ret = mtd->panic_write(mtd, cxt->nextpage * record_size,
226 record_size, &retlen, cxt->oops_buf);
Richard Purdie621e4f82008-02-06 10:17:50 +0000227 else
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100228 ret = mtd->write(mtd, cxt->nextpage * record_size,
229 record_size, &retlen, cxt->oops_buf);
Richard Purdie6ce0a852008-01-29 11:27:11 +0000230
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100231 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);
Simon Kagstrombe957452009-10-29 13:41:11 +0100234 mark_page_used(cxt, cxt->nextpage);
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100235 memset(cxt->oops_buf, 0xff, record_size);
Richard Purdie6ce0a852008-01-29 11:27:11 +0000236
237 mtdoops_inc_counter(cxt);
Richard Purdie621e4f82008-02-06 10:17:50 +0000238}
239
Richard Purdie621e4f82008-02-06 10:17:50 +0000240static 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);
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300246}
Richard Purdie6ce0a852008-01-29 11:27:11 +0000247
248static void find_next_position(struct mtdoops_context *cxt)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100249{
250 struct mtd_info *mtd = cxt->mtd;
Richard Purdie2986bd22008-01-29 11:27:09 +0000251 int ret, page, maxpos = 0;
Richard Purdief0482ee2008-07-26 09:22:45 +0100252 u32 count[2], maxcount = 0xffffffff;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100253 size_t retlen;
254
255 for (page = 0; page < cxt->oops_pages; page++) {
Simon Kagstrombe957452009-10-29 13:41:11 +0100256 /* Assume the page is used */
257 mark_page_used(cxt, page);
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100258 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);
Richard Purdie2986bd22008-01-29 11:27:09 +0000265 continue;
266 }
267
Simon Kagstrombe957452009-10-29 13:41:11 +0100268 if (count[0] == 0xffffffff && count[1] == 0xffffffff)
269 mark_page_unused(cxt, page);
Richard Purdief0482ee2008-07-26 09:22:45 +0100270 if (count[0] == 0xffffffff)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100271 continue;
272 if (maxcount == 0xffffffff) {
Richard Purdief0482ee2008-07-26 09:22:45 +0100273 maxcount = count[0];
Richard Purdie4b23aff2007-05-29 13:31:42 +0100274 maxpos = page;
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300275 } else if (count[0] < 0x40000000 && maxcount > 0xc0000000) {
Richard Purdief0482ee2008-07-26 09:22:45 +0100276 maxcount = count[0];
Richard Purdie4b23aff2007-05-29 13:31:42 +0100277 maxpos = page;
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300278 } else if (count[0] > maxcount && count[0] < 0xc0000000) {
Richard Purdief0482ee2008-07-26 09:22:45 +0100279 maxcount = count[0];
Richard Purdie4b23aff2007-05-29 13:31:42 +0100280 maxpos = page;
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300281 } else if (count[0] > maxcount && count[0] > 0xc0000000
282 && maxcount > 0x80000000) {
Richard Purdief0482ee2008-07-26 09:22:45 +0100283 maxcount = count[0];
Richard Purdie4b23aff2007-05-29 13:31:42 +0100284 maxpos = page;
285 }
286 }
287 if (maxcount == 0xffffffff) {
288 cxt->nextpage = 0;
289 cxt->nextcount = 1;
Richard Purdie43b56932008-07-26 09:25:18 +0100290 schedule_work(&cxt->work_erase);
Richard Purdie6ce0a852008-01-29 11:27:11 +0000291 return;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100292 }
293
294 cxt->nextpage = maxpos;
295 cxt->nextcount = maxcount;
296
Richard Purdie6ce0a852008-01-29 11:27:11 +0000297 mtdoops_inc_counter(cxt);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100298}
299
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100300static 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
Seiji Aguchifc2d5572011-01-12 16:59:29 -0800310 if (reason != KMSG_DUMP_OOPS &&
311 reason != KMSG_DUMP_PANIC &&
312 reason != KMSG_DUMP_KEXEC)
313 return;
314
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100315 /* Only dump oopses if dump_oops is set */
316 if (reason == KMSG_DUMP_OOPS && !dump_oops)
317 return;
318
319 dst = cxt->oops_buf + MTDOOPS_HEADER_SIZE; /* Skip the header */
320 l2_cpy = min(l2, record_size - MTDOOPS_HEADER_SIZE);
321 l1_cpy = min(l1, record_size - MTDOOPS_HEADER_SIZE - l2_cpy);
322
323 s2_start = l2 - l2_cpy;
324 s1_start = l1 - l1_cpy;
325
326 memcpy(dst, s1 + s1_start, l1_cpy);
327 memcpy(dst + l1_cpy, s2 + s2_start, l2_cpy);
328
329 /* Panics must be written immediately */
KOSAKI Motohiro0f4bd462009-12-22 03:15:43 +0000330 if (reason != KMSG_DUMP_OOPS) {
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100331 if (!cxt->mtd->panic_write)
332 printk(KERN_ERR "mtdoops: Cannot write from panic without panic_write\n");
333 else
334 mtdoops_write(cxt, 1);
335 return;
336 }
337
338 /* For other cases, schedule work to write it "nicely" */
339 schedule_work(&cxt->work_write);
340}
Richard Purdie4b23aff2007-05-29 13:31:42 +0100341
342static void mtdoops_notify_add(struct mtd_info *mtd)
343{
344 struct mtdoops_context *cxt = &oops_cxt;
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100345 u64 mtdoops_pages = div_u64(mtd->size, record_size);
346 int err;
Simon Kagstrombe957452009-10-29 13:41:11 +0100347
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100348 if (!strcmp(mtd->name, mtddev))
Adrian Huntere2a0f252009-02-16 18:21:35 +0200349 cxt->mtd_index = mtd->index;
350
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300351 if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100352 return;
353
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300354 if (mtd->size < mtd->erasesize * 2) {
355 printk(KERN_ERR "mtdoops: MTD partition %d not big enough for mtdoops\n",
356 mtd->index);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100357 return;
358 }
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100359 if (mtd->erasesize < record_size) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300360 printk(KERN_ERR "mtdoops: eraseblock size of MTD partition %d too small\n",
361 mtd->index);
Richard Purdie79dcd8e2008-01-29 10:25:55 +0000362 return;
363 }
Simon Kagstrom1114e3d2009-11-03 08:08:41 +0200364 if (mtd->size > MTDOOPS_MAX_MTD_SIZE) {
365 printk(KERN_ERR "mtdoops: mtd%d is too large (limit is %d MiB)\n",
366 mtd->index, MTDOOPS_MAX_MTD_SIZE / 1024 / 1024);
367 return;
368 }
369
Simon Kagstrombe957452009-10-29 13:41:11 +0100370 /* oops_page_used is a bit field */
371 cxt->oops_page_used = vmalloc(DIV_ROUND_UP(mtdoops_pages,
372 BITS_PER_LONG));
373 if (!cxt->oops_page_used) {
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100374 printk(KERN_ERR "mtdoops: could not allocate page array\n");
375 return;
376 }
377
378 cxt->dump.dump = mtdoops_do_dump;
379 err = kmsg_dump_register(&cxt->dump);
380 if (err) {
381 printk(KERN_ERR "mtdoops: registering kmsg dumper failed, error %d\n", err);
382 vfree(cxt->oops_page_used);
383 cxt->oops_page_used = NULL;
Simon Kagstrombe957452009-10-29 13:41:11 +0100384 return;
385 }
Simon Kagstrom1114e3d2009-11-03 08:08:41 +0200386
Richard Purdie4b23aff2007-05-29 13:31:42 +0100387 cxt->mtd = mtd;
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100388 cxt->oops_pages = (int)mtd->size / record_size;
Richard Purdie6ce0a852008-01-29 11:27:11 +0000389 find_next_position(cxt);
Richard Purdie79dcd8e2008-01-29 10:25:55 +0000390 printk(KERN_INFO "mtdoops: Attached to MTD device %d\n", mtd->index);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100391}
392
393static void mtdoops_notify_remove(struct mtd_info *mtd)
394{
395 struct mtdoops_context *cxt = &oops_cxt;
396
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300397 if (mtd->index != cxt->mtd_index || cxt->mtd_index < 0)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100398 return;
399
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100400 if (kmsg_dump_unregister(&cxt->dump) < 0)
401 printk(KERN_WARNING "mtdoops: could not unregister kmsg_dumper\n");
402
Richard Purdie4b23aff2007-05-29 13:31:42 +0100403 cxt->mtd = NULL;
Tejun Heo75c52a42010-12-11 17:51:44 +0100404 flush_work_sync(&cxt->work_erase);
405 flush_work_sync(&cxt->work_write);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100406}
407
Richard Purdie4b23aff2007-05-29 13:31:42 +0100408
409static struct mtd_notifier mtdoops_notifier = {
410 .add = mtdoops_notify_add,
411 .remove = mtdoops_notify_remove,
412};
413
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100414static int __init mtdoops_init(void)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100415{
416 struct mtdoops_context *cxt = &oops_cxt;
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100417 int mtd_index;
418 char *endp;
Richard Purdie4b23aff2007-05-29 13:31:42 +0100419
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100420 if (strlen(mtddev) == 0) {
421 printk(KERN_ERR "mtdoops: mtd device (mtddev=name/number) must be supplied\n");
422 return -EINVAL;
423 }
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100424 if ((record_size & 4095) != 0) {
425 printk(KERN_ERR "mtdoops: record_size must be a multiple of 4096\n");
426 return -EINVAL;
427 }
428 if (record_size < 4096) {
429 printk(KERN_ERR "mtdoops: record_size must be over 4096 bytes\n");
430 return -EINVAL;
431 }
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100432
433 /* Setup the MTD device to use */
Richard Purdie4b23aff2007-05-29 13:31:42 +0100434 cxt->mtd_index = -1;
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100435 mtd_index = simple_strtoul(mtddev, &endp, 0);
436 if (*endp == '\0')
437 cxt->mtd_index = mtd_index;
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100438
Simon Kagstrom9507b0c2009-10-29 13:41:19 +0100439 cxt->oops_buf = vmalloc(record_size);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100440 if (!cxt->oops_buf) {
Artem Bityutskiya15b1242009-10-11 13:40:40 +0300441 printk(KERN_ERR "mtdoops: failed to allocate buffer workspace\n");
Richard Purdie4b23aff2007-05-29 13:31:42 +0100442 return -ENOMEM;
443 }
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100444 memset(cxt->oops_buf, 0xff, record_size);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100445
Richard Purdie6ce0a852008-01-29 11:27:11 +0000446 INIT_WORK(&cxt->work_erase, mtdoops_workfunc_erase);
447 INIT_WORK(&cxt->work_write, mtdoops_workfunc_write);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100448
Richard Purdie4b23aff2007-05-29 13:31:42 +0100449 register_mtd_user(&mtdoops_notifier);
450 return 0;
451}
452
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100453static void __exit mtdoops_exit(void)
Richard Purdie4b23aff2007-05-29 13:31:42 +0100454{
455 struct mtdoops_context *cxt = &oops_cxt;
456
457 unregister_mtd_user(&mtdoops_notifier);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100458 vfree(cxt->oops_buf);
Simon Kagstrombe957452009-10-29 13:41:11 +0100459 vfree(cxt->oops_page_used);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100460}
461
462
Simon Kagstrom2e386e42009-11-03 14:19:03 +0100463module_init(mtdoops_init);
464module_exit(mtdoops_exit);
Richard Purdie4b23aff2007-05-29 13:31:42 +0100465
466MODULE_LICENSE("GPL");
467MODULE_AUTHOR("Richard Purdie <rpurdie@openedhand.com>");
468MODULE_DESCRIPTION("MTD Oops/Panic console logger/driver");