summaryrefslogtreecommitdiffstats
path: root/drivers/mtd/ubi/debug.c
blob: 61af9bb560ab6777cd90ea5125790f38ee6139a9 (plain)
1
2
3
4
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
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
/*
 * Copyright (c) International Business Machines Corp., 2006
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 *
 * Author: Artem Bityutskiy (Битюцкий Артём)
 */

/*
 * Here we keep all the UBI debugging stuff which should normally be disabled
 * and compiled-out, but it is extremely helpful when hunting bugs or doing big
 * changes.
 */

#ifdef CONFIG_MTD_UBI_DEBUG

#include "ubi.h"
#include <linux/debugfs.h>
#include <linux/uaccess.h>
#include <linux/module.h>

/**
 * ubi_dbg_dump_ec_hdr - dump an erase counter header.
 * @ec_hdr: the erase counter header to dump
 */
void ubi_dbg_dump_ec_hdr(const struct ubi_ec_hdr *ec_hdr)
{
	printk(KERN_DEBUG "Erase counter header dump:\n");
	printk(KERN_DEBUG "\tmagic          %#08x\n",
	       be32_to_cpu(ec_hdr->magic));
	printk(KERN_DEBUG "\tversion        %d\n", (int)ec_hdr->version);
	printk(KERN_DEBUG "\tec             %llu\n",
	       (long long)be64_to_cpu(ec_hdr->ec));
	printk(KERN_DEBUG "\tvid_hdr_offset %d\n",
	       be32_to_cpu(ec_hdr->vid_hdr_offset));
	printk(KERN_DEBUG "\tdata_offset    %d\n",
	       be32_to_cpu(ec_hdr->data_offset));
	printk(KERN_DEBUG "\timage_seq      %d\n",
	       be32_to_cpu(ec_hdr->image_seq));
	printk(KERN_DEBUG "\thdr_crc        %#08x\n",
	       be32_to_cpu(ec_hdr->hdr_crc));
	printk(KERN_DEBUG "erase counter header hexdump:\n");
	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
		       ec_hdr, UBI_EC_HDR_SIZE, 1);
}

/**
 * ubi_dbg_dump_vid_hdr - dump a volume identifier header.
 * @vid_hdr: the volume identifier header to dump
 */
void ubi_dbg_dump_vid_hdr(const struct ubi_vid_hdr *vid_hdr)
{
	printk(KERN_DEBUG "Volume identifier header dump:\n");
	printk(KERN_DEBUG "\tmagic     %08x\n", be32_to_cpu(vid_hdr->magic));
	printk(KERN_DEBUG "\tversion   %d\n",  (int)vid_hdr->version);
	printk(KERN_DEBUG "\tvol_type  %d\n",  (int)vid_hdr->vol_type);
	printk(KERN_DEBUG "\tcopy_flag %d\n",  (int)vid_hdr->copy_flag);
	printk(KERN_DEBUG "\tcompat    %d\n",  (int)vid_hdr->compat);
	printk(KERN_DEBUG "\tvol_id    %d\n",  be32_to_cpu(vid_hdr->vol_id));
	printk(KERN_DEBUG "\tlnum      %d\n",  be32_to_cpu(vid_hdr->lnum));
	printk(KERN_DEBUG "\tdata_size %d\n",  be32_to_cpu(vid_hdr->data_size));
	printk(KERN_DEBUG "\tused_ebs  %d\n",  be32_to_cpu(vid_hdr->used_ebs));
	printk(KERN_DEBUG "\tdata_pad  %d\n",  be32_to_cpu(vid_hdr->data_pad));
	printk(KERN_DEBUG "\tsqnum     %llu\n",
		(unsigned long long)be64_to_cpu(vid_hdr->sqnum));
	printk(KERN_DEBUG "\thdr_crc   %08x\n", be32_to_cpu(vid_hdr->hdr_crc));
	printk(KERN_DEBUG "Volume identifier header hexdump:\n");
	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1,
		       vid_hdr, UBI_VID_HDR_SIZE, 1);
}

/**
 * ubi_dbg_dump_vol_info- dump volume information.
 * @vol: UBI volume description object
 */
void ubi_dbg_dump_vol_info(const struct ubi_volume *vol)
{
	printk(KERN_DEBUG "Volume information dump:\n");
	printk(KERN_DEBUG "\tvol_id          %d\n", vol->vol_id);
	printk(KERN_DEBUG "\treserved_pebs   %d\n", vol->reserved_pebs);
	printk(KERN_DEBUG "\talignment       %d\n", vol->alignment);
	printk(KERN_DEBUG "\tdata_pad        %d\n", vol->data_pad);
	printk(KERN_DEBUG "\tvol_type        %d\n", vol->vol_type);
	printk(KERN_DEBUG "\tname_len        %d\n", vol->name_len);
	printk(KERN_DEBUG "\tusable_leb_size %d\n", vol->usable_leb_size);
	printk(KERN_DEBUG "\tused_ebs        %d\n", vol->used_ebs);
	printk(KERN_DEBUG "\tused_bytes      %lld\n", vol->used_bytes);
	printk(KERN_DEBUG "\tlast_eb_bytes   %d\n", vol->last_eb_bytes);
	printk(KERN_DEBUG "\tcorrupted       %d\n", vol->corrupted);
	printk(KERN_DEBUG "\tupd_marker      %d\n", vol->upd_marker);

	if (vol->name_len <= UBI_VOL_NAME_MAX &&
	    strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
		printk(KERN_DEBUG "\tname            %s\n", vol->name);
	} else {
		printk(KERN_DEBUG "\t1st 5 characters of name: %c%c%c%c%c\n",
		       vol->name[0], vol->name[1], vol->name[2],
		       vol->name[3], vol->name[4]);
	}
}

/**
 * ubi_dbg_dump_vtbl_record - dump a &struct ubi_vtbl_record object.
 * @r: the object to dump
 * @idx: volume table index
 */
void ubi_dbg_dump_vtbl_record(const struct ubi_vtbl_record *r, int idx)
{
	int name_len = be16_to_cpu(r->name_len);

	printk(KERN_DEBUG "Volume table record %d dump:\n", idx);
	printk(KERN_DEBUG "\treserved_pebs   %d\n",
	       be32_to_cpu(r->reserved_pebs));
	printk(KERN_DEBUG "\talignment       %d\n", be32_to_cpu(r->alignment));
	printk(KERN_DEBUG "\tdata_pad        %d\n", be32_to_cpu(r->data_pad));
	printk(KERN_DEBUG "\tvol_type        %d\n", (int)r->vol_type);
	printk(KERN_DEBUG "\tupd_marker      %d\n", (int)r->upd_marker);
	printk(KERN_DEBUG "\tname_len        %d\n", name_len);

	if (r->name[0] == '\0') {
		printk(KERN_DEBUG "\tname            NULL\n");
		return;
	}

	if (name_len <= UBI_VOL_NAME_MAX &&
	    strnlen(&r->name[0], name_len + 1) == name_len) {
		printk(KERN_DEBUG "\tname            %s\n", &r->name[0]);
	} else {
		printk(KERN_DEBUG "\t1st 5 characters of name: %c%c%c%c%c\n",
			r->name[0], r->name[1], r->name[2], r->name[3],
			r->name[4]);
	}
	printk(KERN_DEBUG "\tcrc             %#08x\n", be32_to_cpu(r->crc));
}

/**
 * ubi_dbg_dump_sv - dump a &struct ubi_scan_volume object.
 * @sv: the object to dump
 */
void ubi_dbg_dump_sv(const struct ubi_scan_volume *sv)
{
	printk(KERN_DEBUG "Volume scanning information dump:\n");
	printk(KERN_DEBUG "\tvol_id         %d\n", sv->vol_id);
	printk(KERN_DEBUG "\thighest_lnum   %d\n", sv->highest_lnum);
	printk(KERN_DEBUG "\tleb_count      %d\n", sv->leb_count);
	printk(KERN_DEBUG "\tcompat         %d\n", sv->compat);
	printk(KERN_DEBUG "\tvol_type       %d\n", sv->vol_type);
	printk(KERN_DEBUG "\tused_ebs       %d\n", sv->used_ebs);
	printk(KERN_DEBUG "\tlast_data_size %d\n", sv->last_data_size);
	printk(KERN_DEBUG "\tdata_pad       %d\n", sv->data_pad);
}

/**
 * ubi_dbg_dump_seb - dump a &struct ubi_scan_leb object.
 * @seb: the object to dump
 * @type: object type: 0 - not corrupted, 1 - corrupted
 */
void ubi_dbg_dump_seb(const struct ubi_scan_leb *seb, int type)
{
	printk(KERN_DEBUG "eraseblock scanning information dump:\n");
	printk(KERN_DEBUG "\tec       %d\n", seb->ec);
	printk(KERN_DEBUG "\tpnum     %d\n", seb->pnum);
	if (type == 0) {
		printk(KERN_DEBUG "\tlnum     %d\n", seb->lnum);
		printk(KERN_DEBUG "\tscrub    %d\n", seb->scrub);
		printk(KERN_DEBUG "\tsqnum    %llu\n", seb->sqnum);
	}
}

/**
 * ubi_dbg_dump_mkvol_req - dump a &struct ubi_mkvol_req object.
 * @req: the object to dump
 */
void ubi_dbg_dump_mkvol_req(const struct ubi_mkvol_req *req)
{
	char nm[17];

	printk(KERN_DEBUG "Volume creation request dump:\n");
	printk(KERN_DEBUG "\tvol_id    %d\n",   req->vol_id);
	printk(KERN_DEBUG "\talignment %d\n",   req->alignment);
	printk(KERN_DEBUG "\tbytes     %lld\n", (long long)req->bytes);
	printk(KERN_DEBUG "\tvol_type  %d\n",   req->vol_type);
	printk(KERN_DEBUG "\tname_len  %d\n",   req->name_len);

	memcpy(nm, req->name, 16);
	nm[16] = 0;
	printk(KERN_DEBUG "\t1st 16 characters of name: %s\n", nm);
}

/**
 * ubi_dbg_dump_flash - dump a region of flash.
 * @ubi: UBI device description object
 * @pnum: the physical eraseblock number to dump
 * @offset: the starting offset within the physical eraseblock to dump
 * @len: the length of the region to dump
 */
void ubi_dbg_dump_flash(struct ubi_device *ubi, int pnum, int offset, int len)
{
	int err;
	size_t read;
	void *buf;
	loff_t addr = (loff_t)pnum * ubi->peb_size + offset;

	buf = vmalloc(len);
	if (!buf)
		return;
	err = mtd_read(ubi->mtd, addr, len, &read, buf);
	if (err && err != -EUCLEAN) {
		ubi_err("error %d while reading %d bytes from PEB %d:%d, "
			"read %zd bytes", err, len, pnum, offset, read);
		goto out;
	}

	dbg_msg("dumping %d bytes of data from PEB %d, offset %d",
		len, pnum, offset);
	print_hex_dump(KERN_DEBUG, "", DUMP_PREFIX_OFFSET, 32, 1, buf, len, 1);
out:
	vfree(buf);
	return;
}

/**
 * ubi_debugging_init_dev - initialize debugging for an UBI device.
 * @ubi: UBI device description object
 *
 * This function initializes debugging-related data for UBI device @ubi.
 * Returns zero in case of success and a negative error code in case of
 * failure.
 */
int ubi_debugging_init_dev(struct ubi_device *ubi)
{
	ubi->dbg = kzalloc(sizeof(struct ubi_debug_info), GFP_KERNEL);
	if (!ubi->dbg)
		return -ENOMEM;

	return 0;
}

/**
 * ubi_debugging_exit_dev - free debugging data for an UBI device.
 * @ubi: UBI device description object
 */
void ubi_debugging_exit_dev(struct ubi_device *ubi)
{
	kfree(ubi->dbg);
}

/*
 * Root directory for UBI stuff in debugfs. Contains sub-directories which
 * contain the stuff specific to particular UBI devices.
 */
static struct dentry *dfs_rootdir;

/**
 * ubi_debugfs_init - create UBI debugfs directory.
 *
 * Create UBI debugfs directory. Returns zero in case of success and a negative
 * error code in case of failure.
 */
int ubi_debugfs_init(void)
{
	dfs_rootdir = debugfs_create_dir("ubi", NULL);
	if (IS_ERR_OR_NULL(dfs_rootdir)) {
		int err = dfs_rootdir ? -ENODEV : PTR_ERR(dfs_rootdir);

		ubi_err("cannot create \"ubi\" debugfs directory, error %d\n",
			err);
		return err;
	}

	return 0;
}

/**
 * ubi_debugfs_exit - remove UBI debugfs directory.
 */
void ubi_debugfs_exit(void)
{
	debugfs_remove(dfs_rootdir);
}

/* Read an UBI debugfs file */
static ssize_t dfs_file_read(struct file *file, char __user *user_buf,
			     size_t count, loff_t *ppos)
{
	unsigned long ubi_num = (unsigned long)file->private_data;
	struct dentry *dent = file->f_path.dentry;
	struct ubi_device *ubi;
	struct ubi_debug_info *d;
	char buf[3];
	int val;

	ubi = ubi_get_device(ubi_num);
	if (!ubi)
		return -ENODEV;
	d = ubi->dbg;

	if (dent == d->dfs_chk_gen)
		val = d->chk_gen;
	else if (dent == d->dfs_chk_io)
		val = d->chk_io;
	else if (dent == d->dfs_disable_bgt)
		val = d->disable_bgt;
	else if (dent == d->dfs_emulate_bitflips)
		val = d->emulate_bitflips;
	else if (dent == d->dfs_emulate_io_failures)
		val = d->emulate_io_failures;
	else {
		count = -EINVAL;
		goto out;
	}

	if (val)
		buf[0] = '1';
	else
		buf[0] = '0';
	buf[1] = '\n';
	buf[2] = 0x00;

	count = simple_read_from_buffer(user_buf, count, ppos, buf, 2);

out:
	ubi_put_device(ubi);
	return count;
}

/* Write an UBI debugfs file */
static ssize_t dfs_file_write(struct file *file, const char __user *user_buf,
			      size_t count, loff_t *ppos)
{
	unsigned long ubi_num = (unsigned long)file->private_data;
	struct dentry *dent = file->f_path.dentry;
	struct ubi_device *ubi;
	struct ubi_debug_info *d;
	size_t buf_size;
	char buf[8];
	int val;

	ubi = ubi_get_device(ubi_num);
	if (!ubi)
		return -ENODEV;
	d = ubi->dbg;

	buf_size = min_t(size_t, count, (sizeof(buf) - 1));
	if (copy_from_user(buf, user_buf, buf_size)) {
		count = -EFAULT;
		goto out;
	}

	if (buf[0] == '1')
		val = 1;
	else if (buf[0] == '0')
		val = 0;
	else {
		count = -EINVAL;
		goto out;
	}

	if (dent == d->dfs_chk_gen)
		d->chk_gen = val;
	else if (dent == d->dfs_chk_io)
		d->chk_io = val;
	else if (dent == d->dfs_disable_bgt)
		d->disable_bgt = val;
	else if (dent == d->dfs_emulate_bitflips)
		d->emulate_bitflips = val;
	else if (dent == d->dfs_emulate_io_failures)
		d->emulate_io_failures = val;
	else
		count = -EINVAL;

out:
	ubi_put_device(ubi);
	return count;
}

/* File operations for all UBI debugfs files */
static const struct file_operations dfs_fops = {
	.read   = dfs_file_read,
	.write  = dfs_file_write,
	.open	= simple_open,
	.llseek = no_llseek,
	.owner  = THIS_MODULE,
};

/**
 * ubi_debugfs_init_dev - initialize debugfs for an UBI device.
 * @ubi: UBI device description object
 *
 * This function creates all debugfs files for UBI device @ubi. Returns zero in
 * case of success and a negative error code in case of failure.
 */
int ubi_debugfs_init_dev(struct ubi_device *ubi)
{
	int err, n;
	unsigned long ubi_num = ubi->ubi_num;
	const char *fname;
	struct dentry *dent;
	struct ubi_debug_info *d = ubi->dbg;

	n = snprintf(d->dfs_dir_name, UBI_DFS_DIR_LEN + 1, UBI_DFS_DIR_NAME,
		     ubi->ubi_num);
	if (n == UBI_DFS_DIR_LEN) {
		/* The array size is too small */
		fname = UBI_DFS_DIR_NAME;
		dent = ERR_PTR(-EINVAL);
		goto out;
	}

	fname = d->dfs_dir_name;
	dent = debugfs_create_dir(fname, dfs_rootdir);
	if (IS_ERR_OR_NULL(dent))
		goto out;
	d->dfs_dir = dent;

	fname = "chk_gen";
	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
				   &dfs_fops);
	if (IS_ERR_OR_NULL(dent))
		goto out_remove;
	d->dfs_chk_gen = dent;

	fname = "chk_io";
	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
				   &dfs_fops);
	if (IS_ERR_OR_NULL(dent))
		goto out_remove;
	d->dfs_chk_io = dent;

	fname = "tst_disable_bgt";
	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
				   &dfs_fops);
	if (IS_ERR_OR_NULL(dent))
		goto out_remove;
	d->dfs_disable_bgt = dent;

	fname = "tst_emulate_bitflips";
	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
				   &dfs_fops);
	if (IS_ERR_OR_NULL(dent))
		goto out_remove;
	d->dfs_emulate_bitflips = dent;

	fname = "tst_emulate_io_failures";
	dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
				   &dfs_fops);
	if (IS_ERR_OR_NULL(dent))
		goto out_remove;
	d->dfs_emulate_io_failures = dent;

	return 0;

out_remove:
	debugfs_remove_recursive(d->dfs_dir);
out:
	err = dent ? PTR_ERR(dent) : -ENODEV;
	ubi_err("cannot create \"%s\" debugfs file or directory, error %d\n",
		fname, err);
	return err;
}

/**
 * dbg_debug_exit_dev - free all debugfs files corresponding to device @ubi
 * @ubi: UBI device description object
 */
void ubi_debugfs_exit_dev(struct ubi_device *ubi)
{
	debugfs_remove_recursive(ubi->dbg->dfs_dir);
}

#endif /* CONFIG_MTD_UBI_DEBUG */
OpenPOWER on IntegriCloud