ia64/linux-2.6.18-xen.hg

view drivers/mtd/mtdpart.c @ 893:f994bfe9b93b

linux/blktap2: reduce TLB flush scope

c/s 885 added very coarse TLB flushing. Since these flushes always
follow single page updates, single page flushes (when available) are
sufficient.

Signed-off-by: Jan Beulich <jbeulich@novell.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 04 10:32:57 2009 +0100 (2009-06-04)
parents 831230e53067
children
line source
1 /*
2 * Simple MTD partitioning layer
3 *
4 * (C) 2000 Nicolas Pitre <nico@cam.org>
5 *
6 * This code is GPL
7 *
8 * $Id: mtdpart.c,v 1.55 2005/11/07 11:14:20 gleixner Exp $
9 *
10 * 02-21-2002 Thomas Gleixner <gleixner@autronix.de>
11 * added support for read_oob, write_oob
12 */
14 #include <linux/module.h>
15 #include <linux/types.h>
16 #include <linux/kernel.h>
17 #include <linux/slab.h>
18 #include <linux/list.h>
19 #include <linux/kmod.h>
20 #include <linux/mtd/mtd.h>
21 #include <linux/mtd/partitions.h>
22 #include <linux/mtd/compatmac.h>
24 /* Our partition linked list */
25 static LIST_HEAD(mtd_partitions);
27 /* Our partition node structure */
28 struct mtd_part {
29 struct mtd_info mtd;
30 struct mtd_info *master;
31 u_int32_t offset;
32 int index;
33 struct list_head list;
34 int registered;
35 };
37 /*
38 * Given a pointer to the MTD object in the mtd_part structure, we can retrieve
39 * the pointer to that structure with this macro.
40 */
41 #define PART(x) ((struct mtd_part *)(x))
44 /*
45 * MTD methods which simply translate the effective address and pass through
46 * to the _real_ device.
47 */
49 static int part_read (struct mtd_info *mtd, loff_t from, size_t len,
50 size_t *retlen, u_char *buf)
51 {
52 struct mtd_part *part = PART(mtd);
53 int res;
55 if (from >= mtd->size)
56 len = 0;
57 else if (from + len > mtd->size)
58 len = mtd->size - from;
59 res = part->master->read (part->master, from + part->offset,
60 len, retlen, buf);
61 if (unlikely(res)) {
62 if (res == -EUCLEAN)
63 mtd->ecc_stats.corrected++;
64 if (res == -EBADMSG)
65 mtd->ecc_stats.failed++;
66 }
67 return res;
68 }
70 static int part_point (struct mtd_info *mtd, loff_t from, size_t len,
71 size_t *retlen, u_char **buf)
72 {
73 struct mtd_part *part = PART(mtd);
74 if (from >= mtd->size)
75 len = 0;
76 else if (from + len > mtd->size)
77 len = mtd->size - from;
78 return part->master->point (part->master, from + part->offset,
79 len, retlen, buf);
80 }
82 static void part_unpoint (struct mtd_info *mtd, u_char *addr, loff_t from, size_t len)
83 {
84 struct mtd_part *part = PART(mtd);
86 part->master->unpoint (part->master, addr, from + part->offset, len);
87 }
89 static int part_read_oob(struct mtd_info *mtd, loff_t from,
90 struct mtd_oob_ops *ops)
91 {
92 struct mtd_part *part = PART(mtd);
93 int res;
95 if (from >= mtd->size)
96 return -EINVAL;
97 if (from + ops->len > mtd->size)
98 return -EINVAL;
99 res = part->master->read_oob(part->master, from + part->offset, ops);
101 if (unlikely(res)) {
102 if (res == -EUCLEAN)
103 mtd->ecc_stats.corrected++;
104 if (res == -EBADMSG)
105 mtd->ecc_stats.failed++;
106 }
107 return res;
108 }
110 static int part_read_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
111 size_t *retlen, u_char *buf)
112 {
113 struct mtd_part *part = PART(mtd);
114 return part->master->read_user_prot_reg (part->master, from,
115 len, retlen, buf);
116 }
118 static int part_get_user_prot_info (struct mtd_info *mtd,
119 struct otp_info *buf, size_t len)
120 {
121 struct mtd_part *part = PART(mtd);
122 return part->master->get_user_prot_info (part->master, buf, len);
123 }
125 static int part_read_fact_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
126 size_t *retlen, u_char *buf)
127 {
128 struct mtd_part *part = PART(mtd);
129 return part->master->read_fact_prot_reg (part->master, from,
130 len, retlen, buf);
131 }
133 static int part_get_fact_prot_info (struct mtd_info *mtd,
134 struct otp_info *buf, size_t len)
135 {
136 struct mtd_part *part = PART(mtd);
137 return part->master->get_fact_prot_info (part->master, buf, len);
138 }
140 static int part_write (struct mtd_info *mtd, loff_t to, size_t len,
141 size_t *retlen, const u_char *buf)
142 {
143 struct mtd_part *part = PART(mtd);
144 if (!(mtd->flags & MTD_WRITEABLE))
145 return -EROFS;
146 if (to >= mtd->size)
147 len = 0;
148 else if (to + len > mtd->size)
149 len = mtd->size - to;
150 return part->master->write (part->master, to + part->offset,
151 len, retlen, buf);
152 }
154 static int part_write_oob(struct mtd_info *mtd, loff_t to,
155 struct mtd_oob_ops *ops)
156 {
157 struct mtd_part *part = PART(mtd);
159 if (!(mtd->flags & MTD_WRITEABLE))
160 return -EROFS;
162 if (to >= mtd->size)
163 return -EINVAL;
164 if (to + ops->len > mtd->size)
165 return -EINVAL;
166 return part->master->write_oob(part->master, to + part->offset, ops);
167 }
169 static int part_write_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len,
170 size_t *retlen, u_char *buf)
171 {
172 struct mtd_part *part = PART(mtd);
173 return part->master->write_user_prot_reg (part->master, from,
174 len, retlen, buf);
175 }
177 static int part_lock_user_prot_reg (struct mtd_info *mtd, loff_t from, size_t len)
178 {
179 struct mtd_part *part = PART(mtd);
180 return part->master->lock_user_prot_reg (part->master, from, len);
181 }
183 static int part_writev (struct mtd_info *mtd, const struct kvec *vecs,
184 unsigned long count, loff_t to, size_t *retlen)
185 {
186 struct mtd_part *part = PART(mtd);
187 if (!(mtd->flags & MTD_WRITEABLE))
188 return -EROFS;
189 return part->master->writev (part->master, vecs, count,
190 to + part->offset, retlen);
191 }
193 static int part_erase (struct mtd_info *mtd, struct erase_info *instr)
194 {
195 struct mtd_part *part = PART(mtd);
196 int ret;
197 if (!(mtd->flags & MTD_WRITEABLE))
198 return -EROFS;
199 if (instr->addr >= mtd->size)
200 return -EINVAL;
201 instr->addr += part->offset;
202 ret = part->master->erase(part->master, instr);
203 return ret;
204 }
206 void mtd_erase_callback(struct erase_info *instr)
207 {
208 if (instr->mtd->erase == part_erase) {
209 struct mtd_part *part = PART(instr->mtd);
211 if (instr->fail_addr != 0xffffffff)
212 instr->fail_addr -= part->offset;
213 instr->addr -= part->offset;
214 }
215 if (instr->callback)
216 instr->callback(instr);
217 }
218 EXPORT_SYMBOL_GPL(mtd_erase_callback);
220 static int part_lock (struct mtd_info *mtd, loff_t ofs, size_t len)
221 {
222 struct mtd_part *part = PART(mtd);
223 if ((len + ofs) > mtd->size)
224 return -EINVAL;
225 return part->master->lock(part->master, ofs + part->offset, len);
226 }
228 static int part_unlock (struct mtd_info *mtd, loff_t ofs, size_t len)
229 {
230 struct mtd_part *part = PART(mtd);
231 if ((len + ofs) > mtd->size)
232 return -EINVAL;
233 return part->master->unlock(part->master, ofs + part->offset, len);
234 }
236 static void part_sync(struct mtd_info *mtd)
237 {
238 struct mtd_part *part = PART(mtd);
239 part->master->sync(part->master);
240 }
242 static int part_suspend(struct mtd_info *mtd)
243 {
244 struct mtd_part *part = PART(mtd);
245 return part->master->suspend(part->master);
246 }
248 static void part_resume(struct mtd_info *mtd)
249 {
250 struct mtd_part *part = PART(mtd);
251 part->master->resume(part->master);
252 }
254 static int part_block_isbad (struct mtd_info *mtd, loff_t ofs)
255 {
256 struct mtd_part *part = PART(mtd);
257 if (ofs >= mtd->size)
258 return -EINVAL;
259 ofs += part->offset;
260 return part->master->block_isbad(part->master, ofs);
261 }
263 static int part_block_markbad (struct mtd_info *mtd, loff_t ofs)
264 {
265 struct mtd_part *part = PART(mtd);
266 int res;
268 if (!(mtd->flags & MTD_WRITEABLE))
269 return -EROFS;
270 if (ofs >= mtd->size)
271 return -EINVAL;
272 ofs += part->offset;
273 res = part->master->block_markbad(part->master, ofs);
274 if (!res)
275 mtd->ecc_stats.badblocks++;
276 return res;
277 }
279 /*
280 * This function unregisters and destroy all slave MTD objects which are
281 * attached to the given master MTD object.
282 */
284 int del_mtd_partitions(struct mtd_info *master)
285 {
286 struct list_head *node;
287 struct mtd_part *slave;
289 for (node = mtd_partitions.next;
290 node != &mtd_partitions;
291 node = node->next) {
292 slave = list_entry(node, struct mtd_part, list);
293 if (slave->master == master) {
294 struct list_head *prev = node->prev;
295 __list_del(prev, node->next);
296 if(slave->registered)
297 del_mtd_device(&slave->mtd);
298 kfree(slave);
299 node = prev;
300 }
301 }
303 return 0;
304 }
306 /*
307 * This function, given a master MTD object and a partition table, creates
308 * and registers slave MTD objects which are bound to the master according to
309 * the partition definitions.
310 * (Q: should we register the master MTD object as well?)
311 */
313 int add_mtd_partitions(struct mtd_info *master,
314 const struct mtd_partition *parts,
315 int nbparts)
316 {
317 struct mtd_part *slave;
318 u_int32_t cur_offset = 0;
319 int i;
321 printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
323 for (i = 0; i < nbparts; i++) {
325 /* allocate the partition structure */
326 slave = kmalloc (sizeof(*slave), GFP_KERNEL);
327 if (!slave) {
328 printk ("memory allocation error while creating partitions for \"%s\"\n",
329 master->name);
330 del_mtd_partitions(master);
331 return -ENOMEM;
332 }
333 memset(slave, 0, sizeof(*slave));
334 list_add(&slave->list, &mtd_partitions);
336 /* set up the MTD object for this partition */
337 slave->mtd.type = master->type;
338 slave->mtd.flags = master->flags & ~parts[i].mask_flags;
339 slave->mtd.size = parts[i].size;
340 slave->mtd.writesize = master->writesize;
341 slave->mtd.oobsize = master->oobsize;
342 slave->mtd.ecctype = master->ecctype;
343 slave->mtd.eccsize = master->eccsize;
345 slave->mtd.name = parts[i].name;
346 slave->mtd.bank_size = master->bank_size;
347 slave->mtd.owner = master->owner;
349 slave->mtd.read = part_read;
350 slave->mtd.write = part_write;
352 if(master->point && master->unpoint){
353 slave->mtd.point = part_point;
354 slave->mtd.unpoint = part_unpoint;
355 }
357 if (master->read_oob)
358 slave->mtd.read_oob = part_read_oob;
359 if (master->write_oob)
360 slave->mtd.write_oob = part_write_oob;
361 if(master->read_user_prot_reg)
362 slave->mtd.read_user_prot_reg = part_read_user_prot_reg;
363 if(master->read_fact_prot_reg)
364 slave->mtd.read_fact_prot_reg = part_read_fact_prot_reg;
365 if(master->write_user_prot_reg)
366 slave->mtd.write_user_prot_reg = part_write_user_prot_reg;
367 if(master->lock_user_prot_reg)
368 slave->mtd.lock_user_prot_reg = part_lock_user_prot_reg;
369 if(master->get_user_prot_info)
370 slave->mtd.get_user_prot_info = part_get_user_prot_info;
371 if(master->get_fact_prot_info)
372 slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
373 if (master->sync)
374 slave->mtd.sync = part_sync;
375 if (!i && master->suspend && master->resume) {
376 slave->mtd.suspend = part_suspend;
377 slave->mtd.resume = part_resume;
378 }
379 if (master->writev)
380 slave->mtd.writev = part_writev;
381 if (master->lock)
382 slave->mtd.lock = part_lock;
383 if (master->unlock)
384 slave->mtd.unlock = part_unlock;
385 if (master->block_isbad)
386 slave->mtd.block_isbad = part_block_isbad;
387 if (master->block_markbad)
388 slave->mtd.block_markbad = part_block_markbad;
389 slave->mtd.erase = part_erase;
390 slave->master = master;
391 slave->offset = parts[i].offset;
392 slave->index = i;
394 if (slave->offset == MTDPART_OFS_APPEND)
395 slave->offset = cur_offset;
396 if (slave->offset == MTDPART_OFS_NXTBLK) {
397 slave->offset = cur_offset;
398 if ((cur_offset % master->erasesize) != 0) {
399 /* Round up to next erasesize */
400 slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
401 printk(KERN_NOTICE "Moving partition %d: "
402 "0x%08x -> 0x%08x\n", i,
403 cur_offset, slave->offset);
404 }
405 }
406 if (slave->mtd.size == MTDPART_SIZ_FULL)
407 slave->mtd.size = master->size - slave->offset;
408 cur_offset = slave->offset + slave->mtd.size;
410 printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
411 slave->offset + slave->mtd.size, slave->mtd.name);
413 /* let's do some sanity checks */
414 if (slave->offset >= master->size) {
415 /* let's register it anyway to preserve ordering */
416 slave->offset = 0;
417 slave->mtd.size = 0;
418 printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
419 parts[i].name);
420 }
421 if (slave->offset + slave->mtd.size > master->size) {
422 slave->mtd.size = master->size - slave->offset;
423 printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
424 parts[i].name, master->name, slave->mtd.size);
425 }
426 if (master->numeraseregions>1) {
427 /* Deal with variable erase size stuff */
428 int i;
429 struct mtd_erase_region_info *regions = master->eraseregions;
431 /* Find the first erase regions which is part of this partition. */
432 for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
433 ;
435 for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
436 if (slave->mtd.erasesize < regions[i].erasesize) {
437 slave->mtd.erasesize = regions[i].erasesize;
438 }
439 }
440 } else {
441 /* Single erase size */
442 slave->mtd.erasesize = master->erasesize;
443 }
445 if ((slave->mtd.flags & MTD_WRITEABLE) &&
446 (slave->offset % slave->mtd.erasesize)) {
447 /* Doesn't start on a boundary of major erase size */
448 /* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
449 slave->mtd.flags &= ~MTD_WRITEABLE;
450 printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
451 parts[i].name);
452 }
453 if ((slave->mtd.flags & MTD_WRITEABLE) &&
454 (slave->mtd.size % slave->mtd.erasesize)) {
455 slave->mtd.flags &= ~MTD_WRITEABLE;
456 printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
457 parts[i].name);
458 }
460 slave->mtd.ecclayout = master->ecclayout;
461 if (master->block_isbad) {
462 uint32_t offs = 0;
464 while(offs < slave->mtd.size) {
465 if (master->block_isbad(master,
466 offs + slave->offset))
467 slave->mtd.ecc_stats.badblocks++;
468 offs += slave->mtd.erasesize;
469 }
470 }
472 if(parts[i].mtdp)
473 { /* store the object pointer (caller may or may not register it */
474 *parts[i].mtdp = &slave->mtd;
475 slave->registered = 0;
476 }
477 else
478 {
479 /* register our partition */
480 add_mtd_device(&slave->mtd);
481 slave->registered = 1;
482 }
483 }
485 return 0;
486 }
488 EXPORT_SYMBOL(add_mtd_partitions);
489 EXPORT_SYMBOL(del_mtd_partitions);
491 static DEFINE_SPINLOCK(part_parser_lock);
492 static LIST_HEAD(part_parsers);
494 static struct mtd_part_parser *get_partition_parser(const char *name)
495 {
496 struct list_head *this;
497 void *ret = NULL;
498 spin_lock(&part_parser_lock);
500 list_for_each(this, &part_parsers) {
501 struct mtd_part_parser *p = list_entry(this, struct mtd_part_parser, list);
503 if (!strcmp(p->name, name) && try_module_get(p->owner)) {
504 ret = p;
505 break;
506 }
507 }
508 spin_unlock(&part_parser_lock);
510 return ret;
511 }
513 int register_mtd_parser(struct mtd_part_parser *p)
514 {
515 spin_lock(&part_parser_lock);
516 list_add(&p->list, &part_parsers);
517 spin_unlock(&part_parser_lock);
519 return 0;
520 }
522 int deregister_mtd_parser(struct mtd_part_parser *p)
523 {
524 spin_lock(&part_parser_lock);
525 list_del(&p->list);
526 spin_unlock(&part_parser_lock);
527 return 0;
528 }
530 int parse_mtd_partitions(struct mtd_info *master, const char **types,
531 struct mtd_partition **pparts, unsigned long origin)
532 {
533 struct mtd_part_parser *parser;
534 int ret = 0;
536 for ( ; ret <= 0 && *types; types++) {
537 parser = get_partition_parser(*types);
538 #ifdef CONFIG_KMOD
539 if (!parser && !request_module("%s", *types))
540 parser = get_partition_parser(*types);
541 #endif
542 if (!parser) {
543 printk(KERN_NOTICE "%s partition parsing not available\n",
544 *types);
545 continue;
546 }
547 ret = (*parser->parse_fn)(master, pparts, origin);
548 if (ret > 0) {
549 printk(KERN_NOTICE "%d %s partitions found on MTD device %s\n",
550 ret, parser->name, master->name);
551 }
552 put_partition_parser(parser);
553 }
554 return ret;
555 }
557 EXPORT_SYMBOL_GPL(parse_mtd_partitions);
558 EXPORT_SYMBOL_GPL(register_mtd_parser);
559 EXPORT_SYMBOL_GPL(deregister_mtd_parser);
561 MODULE_LICENSE("GPL");
562 MODULE_AUTHOR("Nicolas Pitre <nico@cam.org>");
563 MODULE_DESCRIPTION("Generic support for partitioning of MTD devices");