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- #include <linux/kernel.h>
- #include <linux/module.h>
- #include <linux/slab.h>
- #include <linux/sched.h>
- #include <linux/types.h>
- #include <linux/backing-dev.h>
- #include <linux/mtd/mtd.h>
- #include <linux/mtd/concat.h>
- #include <asm/div64.h>
- struct mtd_concat {
- struct mtd_info mtd;
- int num_subdev;
- struct mtd_info **subdev;
- };
- #define SIZEOF_STRUCT_MTD_CONCAT(num_subdev) \
- ((sizeof(struct mtd_concat) + (num_subdev) * sizeof(struct mtd_info *)))
- #define CONCAT(x) ((struct mtd_concat *)(x))
- static int
- concat_read(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int ret = 0, err;
- int i;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- size_t size, retsize;
- if (from >= subdev->size) {
-
- size = 0;
- from -= subdev->size;
- continue;
- }
- if (from + len > subdev->size)
-
- size = subdev->size - from;
- else
-
- size = len;
- err = mtd_read(subdev, from, size, &retsize, buf);
-
- if (unlikely(err)) {
- if (mtd_is_eccerr(err)) {
- mtd->ecc_stats.failed++;
- ret = err;
- } else if (mtd_is_bitflip(err)) {
- mtd->ecc_stats.corrected++;
-
- if (!ret)
- ret = err;
- } else
- return err;
- }
- *retlen += retsize;
- len -= size;
- if (len == 0)
- return ret;
- buf += size;
- from = 0;
- }
- return -EINVAL;
- }
- static int
- concat_write(struct mtd_info *mtd, loff_t to, size_t len,
- size_t * retlen, const u_char * buf)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int err = -EINVAL;
- int i;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- size_t size, retsize;
- if (to >= subdev->size) {
- size = 0;
- to -= subdev->size;
- continue;
- }
- if (to + len > subdev->size)
- size = subdev->size - to;
- else
- size = len;
- err = mtd_write(subdev, to, size, &retsize, buf);
- if (err)
- break;
- *retlen += retsize;
- len -= size;
- if (len == 0)
- break;
- err = -EINVAL;
- buf += size;
- to = 0;
- }
- return err;
- }
- static int
- concat_writev(struct mtd_info *mtd, const struct kvec *vecs,
- unsigned long count, loff_t to, size_t * retlen)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- struct kvec *vecs_copy;
- unsigned long entry_low, entry_high;
- size_t total_len = 0;
- int i;
- int err = -EINVAL;
-
- for (i = 0; i < count; i++)
- total_len += vecs[i].iov_len;
-
- if (mtd->writesize > 1) {
- uint64_t __to = to;
- if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
- return -EINVAL;
- }
-
- vecs_copy = kmemdup(vecs, sizeof(struct kvec) * count, GFP_KERNEL);
- if (!vecs_copy)
- return -ENOMEM;
- entry_low = 0;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- size_t size, wsize, retsize, old_iov_len;
- if (to >= subdev->size) {
- to -= subdev->size;
- continue;
- }
- size = min_t(uint64_t, total_len, subdev->size - to);
- wsize = size;
- entry_high = entry_low;
- while (entry_high < count) {
- if (size <= vecs_copy[entry_high].iov_len)
- break;
- size -= vecs_copy[entry_high++].iov_len;
- }
- old_iov_len = vecs_copy[entry_high].iov_len;
- vecs_copy[entry_high].iov_len = size;
- err = mtd_writev(subdev, &vecs_copy[entry_low],
- entry_high - entry_low + 1, to, &retsize);
- vecs_copy[entry_high].iov_len = old_iov_len - size;
- vecs_copy[entry_high].iov_base += size;
- entry_low = entry_high;
- if (err)
- break;
- *retlen += retsize;
- total_len -= wsize;
- if (total_len == 0)
- break;
- err = -EINVAL;
- to = 0;
- }
- kfree(vecs_copy);
- return err;
- }
- static int
- concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- struct mtd_oob_ops devops = *ops;
- int i, err, ret = 0;
- ops->retlen = ops->oobretlen = 0;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if (from >= subdev->size) {
- from -= subdev->size;
- continue;
- }
-
- if (from + devops.len > subdev->size)
- devops.len = subdev->size - from;
- err = mtd_read_oob(subdev, from, &devops);
- ops->retlen += devops.retlen;
- ops->oobretlen += devops.oobretlen;
-
- if (unlikely(err)) {
- if (mtd_is_eccerr(err)) {
- mtd->ecc_stats.failed++;
- ret = err;
- } else if (mtd_is_bitflip(err)) {
- mtd->ecc_stats.corrected++;
-
- if (!ret)
- ret = err;
- } else
- return err;
- }
- if (devops.datbuf) {
- devops.len = ops->len - ops->retlen;
- if (!devops.len)
- return ret;
- devops.datbuf += devops.retlen;
- }
- if (devops.oobbuf) {
- devops.ooblen = ops->ooblen - ops->oobretlen;
- if (!devops.ooblen)
- return ret;
- devops.oobbuf += ops->oobretlen;
- }
- from = 0;
- }
- return -EINVAL;
- }
- static int
- concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- struct mtd_oob_ops devops = *ops;
- int i, err;
- if (!(mtd->flags & MTD_WRITEABLE))
- return -EROFS;
- ops->retlen = ops->oobretlen = 0;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if (to >= subdev->size) {
- to -= subdev->size;
- continue;
- }
-
- if (to + devops.len > subdev->size)
- devops.len = subdev->size - to;
- err = mtd_write_oob(subdev, to, &devops);
- ops->retlen += devops.retlen;
- ops->oobretlen += devops.oobretlen;
- if (err)
- return err;
- if (devops.datbuf) {
- devops.len = ops->len - ops->retlen;
- if (!devops.len)
- return 0;
- devops.datbuf += devops.retlen;
- }
- if (devops.oobbuf) {
- devops.ooblen = ops->ooblen - ops->oobretlen;
- if (!devops.ooblen)
- return 0;
- devops.oobbuf += devops.oobretlen;
- }
- to = 0;
- }
- return -EINVAL;
- }
- static void concat_erase_callback(struct erase_info *instr)
- {
- wake_up((wait_queue_head_t *) instr->priv);
- }
- static int concat_dev_erase(struct mtd_info *mtd, struct erase_info *erase)
- {
- int err;
- wait_queue_head_t waitq;
- DECLARE_WAITQUEUE(wait, current);
-
- init_waitqueue_head(&waitq);
- erase->mtd = mtd;
- erase->callback = concat_erase_callback;
- erase->priv = (unsigned long) &waitq;
-
- err = mtd_erase(mtd, erase);
- if (!err) {
- set_current_state(TASK_UNINTERRUPTIBLE);
- add_wait_queue(&waitq, &wait);
- if (erase->state != MTD_ERASE_DONE
- && erase->state != MTD_ERASE_FAILED)
- schedule();
- remove_wait_queue(&waitq, &wait);
- set_current_state(TASK_RUNNING);
- err = (erase->state == MTD_ERASE_FAILED) ? -EIO : 0;
- }
- return err;
- }
- static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- struct mtd_info *subdev;
- int i, err;
- uint64_t length, offset = 0;
- struct erase_info *erase;
-
- if (!concat->mtd.numeraseregions) {
-
- if (instr->addr & (concat->mtd.erasesize - 1))
- return -EINVAL;
- if (instr->len & (concat->mtd.erasesize - 1))
- return -EINVAL;
- } else {
-
- struct mtd_erase_region_info *erase_regions =
- concat->mtd.eraseregions;
-
- for (i = 0; i < concat->mtd.numeraseregions &&
- instr->addr >= erase_regions[i].offset; i++) ;
- --i;
-
- if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
- return -EINVAL;
-
- for (; i < concat->mtd.numeraseregions &&
- (instr->addr + instr->len) >= erase_regions[i].offset;
- ++i) ;
- --i;
-
- if (i < 0 || ((instr->addr + instr->len) &
- (erase_regions[i].erasesize - 1)))
- return -EINVAL;
- }
-
- erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
- if (!erase)
- return -ENOMEM;
- *erase = *instr;
- length = instr->len;
-
- for (i = 0; i < concat->num_subdev; i++) {
- subdev = concat->subdev[i];
- if (subdev->size <= erase->addr) {
- erase->addr -= subdev->size;
- offset += subdev->size;
- } else {
- break;
- }
- }
-
- BUG_ON(i >= concat->num_subdev);
-
- err = 0;
- for (; length > 0; i++) {
-
- subdev = concat->subdev[i];
-
- if (erase->addr + length > subdev->size)
- erase->len = subdev->size - erase->addr;
- else
- erase->len = length;
- length -= erase->len;
- if ((err = concat_dev_erase(subdev, erase))) {
-
- BUG_ON(err == -EINVAL);
- if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
- instr->fail_addr = erase->fail_addr + offset;
- break;
- }
-
- erase->addr = 0;
- offset += subdev->size;
- }
- instr->state = erase->state;
- kfree(erase);
- if (err)
- return err;
- if (instr->callback)
- instr->callback(instr);
- return 0;
- }
- static int concat_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i, err = -EINVAL;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- uint64_t size;
- if (ofs >= subdev->size) {
- size = 0;
- ofs -= subdev->size;
- continue;
- }
- if (ofs + len > subdev->size)
- size = subdev->size - ofs;
- else
- size = len;
- err = mtd_lock(subdev, ofs, size);
- if (err)
- break;
- len -= size;
- if (len == 0)
- break;
- err = -EINVAL;
- ofs = 0;
- }
- return err;
- }
- static int concat_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i, err = 0;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- uint64_t size;
- if (ofs >= subdev->size) {
- size = 0;
- ofs -= subdev->size;
- continue;
- }
- if (ofs + len > subdev->size)
- size = subdev->size - ofs;
- else
- size = len;
- err = mtd_unlock(subdev, ofs, size);
- if (err)
- break;
- len -= size;
- if (len == 0)
- break;
- err = -EINVAL;
- ofs = 0;
- }
- return err;
- }
- static void concat_sync(struct mtd_info *mtd)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- mtd_sync(subdev);
- }
- }
- static int concat_suspend(struct mtd_info *mtd)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i, rc = 0;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if ((rc = mtd_suspend(subdev)) < 0)
- return rc;
- }
- return rc;
- }
- static void concat_resume(struct mtd_info *mtd)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- mtd_resume(subdev);
- }
- }
- static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i, res = 0;
- if (!mtd_can_have_bb(concat->subdev[0]))
- return res;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if (ofs >= subdev->size) {
- ofs -= subdev->size;
- continue;
- }
- res = mtd_block_isbad(subdev, ofs);
- break;
- }
- return res;
- }
- static int concat_block_markbad(struct mtd_info *mtd, loff_t ofs)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i, err = -EINVAL;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if (ofs >= subdev->size) {
- ofs -= subdev->size;
- continue;
- }
- err = mtd_block_markbad(subdev, ofs);
- if (!err)
- mtd->ecc_stats.badblocks++;
- break;
- }
- return err;
- }
- static unsigned long concat_get_unmapped_area(struct mtd_info *mtd,
- unsigned long len,
- unsigned long offset,
- unsigned long flags)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- int i;
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- if (offset >= subdev->size) {
- offset -= subdev->size;
- continue;
- }
- return mtd_get_unmapped_area(subdev, len, offset, flags);
- }
- return (unsigned long) -ENOSYS;
- }
- struct mtd_info *mtd_concat_create(struct mtd_info *subdev[],
- int num_devs,
- const char *name)
- {
- int i;
- size_t size;
- struct mtd_concat *concat;
- uint32_t max_erasesize, curr_erasesize;
- int num_erase_region;
- int max_writebufsize = 0;
- printk(KERN_NOTICE "Concatenating MTD devices:\n");
- for (i = 0; i < num_devs; i++)
- printk(KERN_NOTICE "(%d): \"%s\"\n", i, subdev[i]->name);
- printk(KERN_NOTICE "into device \"%s\"\n", name);
-
- size = SIZEOF_STRUCT_MTD_CONCAT(num_devs);
- concat = kzalloc(size, GFP_KERNEL);
- if (!concat) {
- printk
- ("memory allocation error while creating concatenated device \"%s\"\n",
- name);
- return NULL;
- }
- concat->subdev = (struct mtd_info **) (concat + 1);
-
- concat->mtd.type = subdev[0]->type;
- concat->mtd.flags = subdev[0]->flags;
- concat->mtd.size = subdev[0]->size;
- concat->mtd.erasesize = subdev[0]->erasesize;
- concat->mtd.writesize = subdev[0]->writesize;
- for (i = 0; i < num_devs; i++)
- if (max_writebufsize < subdev[i]->writebufsize)
- max_writebufsize = subdev[i]->writebufsize;
- concat->mtd.writebufsize = max_writebufsize;
- concat->mtd.subpage_sft = subdev[0]->subpage_sft;
- concat->mtd.oobsize = subdev[0]->oobsize;
- concat->mtd.oobavail = subdev[0]->oobavail;
- if (subdev[0]->_writev)
- concat->mtd._writev = concat_writev;
- if (subdev[0]->_read_oob)
- concat->mtd._read_oob = concat_read_oob;
- if (subdev[0]->_write_oob)
- concat->mtd._write_oob = concat_write_oob;
- if (subdev[0]->_block_isbad)
- concat->mtd._block_isbad = concat_block_isbad;
- if (subdev[0]->_block_markbad)
- concat->mtd._block_markbad = concat_block_markbad;
- concat->mtd.ecc_stats.badblocks = subdev[0]->ecc_stats.badblocks;
- concat->subdev[0] = subdev[0];
- for (i = 1; i < num_devs; i++) {
- if (concat->mtd.type != subdev[i]->type) {
- kfree(concat);
- printk("Incompatible device type on \"%s\"\n",
- subdev[i]->name);
- return NULL;
- }
- if (concat->mtd.flags != subdev[i]->flags) {
-
- if ((concat->mtd.flags ^ subdev[i]->
- flags) & ~MTD_WRITEABLE) {
- kfree(concat);
- printk("Incompatible device flags on \"%s\"\n",
- subdev[i]->name);
- return NULL;
- } else
-
- concat->mtd.flags |=
- subdev[i]->flags & MTD_WRITEABLE;
- }
- concat->mtd.size += subdev[i]->size;
- concat->mtd.ecc_stats.badblocks +=
- subdev[i]->ecc_stats.badblocks;
- if (concat->mtd.writesize != subdev[i]->writesize ||
- concat->mtd.subpage_sft != subdev[i]->subpage_sft ||
- concat->mtd.oobsize != subdev[i]->oobsize ||
- !concat->mtd._read_oob != !subdev[i]->_read_oob ||
- !concat->mtd._write_oob != !subdev[i]->_write_oob) {
- kfree(concat);
- printk("Incompatible OOB or ECC data on \"%s\"\n",
- subdev[i]->name);
- return NULL;
- }
- concat->subdev[i] = subdev[i];
- }
- mtd_set_ooblayout(&concat->mtd, subdev[0]->ooblayout);
- concat->num_subdev = num_devs;
- concat->mtd.name = name;
- concat->mtd._erase = concat_erase;
- concat->mtd._read = concat_read;
- concat->mtd._write = concat_write;
- concat->mtd._sync = concat_sync;
- concat->mtd._lock = concat_lock;
- concat->mtd._unlock = concat_unlock;
- concat->mtd._suspend = concat_suspend;
- concat->mtd._resume = concat_resume;
- concat->mtd._get_unmapped_area = concat_get_unmapped_area;
-
- max_erasesize = curr_erasesize = subdev[0]->erasesize;
- num_erase_region = 1;
- for (i = 0; i < num_devs; i++) {
- if (subdev[i]->numeraseregions == 0) {
-
- if (subdev[i]->erasesize != curr_erasesize) {
-
- ++num_erase_region;
- curr_erasesize = subdev[i]->erasesize;
- if (curr_erasesize > max_erasesize)
- max_erasesize = curr_erasesize;
- }
- } else {
-
- int j;
- for (j = 0; j < subdev[i]->numeraseregions; j++) {
-
- if (subdev[i]->eraseregions[j].erasesize !=
- curr_erasesize) {
- ++num_erase_region;
- curr_erasesize =
- subdev[i]->eraseregions[j].
- erasesize;
- if (curr_erasesize > max_erasesize)
- max_erasesize = curr_erasesize;
- }
- }
- }
- }
- if (num_erase_region == 1) {
-
- concat->mtd.erasesize = curr_erasesize;
- concat->mtd.numeraseregions = 0;
- } else {
- uint64_t tmp64;
-
- struct mtd_erase_region_info *erase_region_p;
- uint64_t begin, position;
- concat->mtd.erasesize = max_erasesize;
- concat->mtd.numeraseregions = num_erase_region;
- concat->mtd.eraseregions = erase_region_p =
- kmalloc(num_erase_region *
- sizeof (struct mtd_erase_region_info), GFP_KERNEL);
- if (!erase_region_p) {
- kfree(concat);
- printk
- ("memory allocation error while creating erase region list"
- " for device \"%s\"\n", name);
- return NULL;
- }
-
- curr_erasesize = subdev[0]->erasesize;
- begin = position = 0;
- for (i = 0; i < num_devs; i++) {
- if (subdev[i]->numeraseregions == 0) {
-
- if (subdev[i]->erasesize != curr_erasesize) {
-
- erase_region_p->offset = begin;
- erase_region_p->erasesize =
- curr_erasesize;
- tmp64 = position - begin;
- do_div(tmp64, curr_erasesize);
- erase_region_p->numblocks = tmp64;
- begin = position;
- curr_erasesize = subdev[i]->erasesize;
- ++erase_region_p;
- }
- position += subdev[i]->size;
- } else {
-
- int j;
- for (j = 0; j < subdev[i]->numeraseregions; j++) {
-
- if (subdev[i]->eraseregions[j].
- erasesize != curr_erasesize) {
- erase_region_p->offset = begin;
- erase_region_p->erasesize =
- curr_erasesize;
- tmp64 = position - begin;
- do_div(tmp64, curr_erasesize);
- erase_region_p->numblocks = tmp64;
- begin = position;
- curr_erasesize =
- subdev[i]->eraseregions[j].
- erasesize;
- ++erase_region_p;
- }
- position +=
- subdev[i]->eraseregions[j].
- numblocks * (uint64_t)curr_erasesize;
- }
- }
- }
-
- erase_region_p->offset = begin;
- erase_region_p->erasesize = curr_erasesize;
- tmp64 = position - begin;
- do_div(tmp64, curr_erasesize);
- erase_region_p->numblocks = tmp64;
- }
- return &concat->mtd;
- }
- void mtd_concat_destroy(struct mtd_info *mtd)
- {
- struct mtd_concat *concat = CONCAT(mtd);
- if (concat->mtd.numeraseregions)
- kfree(concat->mtd.eraseregions);
- kfree(concat);
- }
- EXPORT_SYMBOL(mtd_concat_create);
- EXPORT_SYMBOL(mtd_concat_destroy);
- MODULE_LICENSE("GPL");
- MODULE_AUTHOR("Robert Kaiser <rkaiser@sysgo.de>");
- MODULE_DESCRIPTION("Generic support for concatenating of MTD devices");
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