* NAND support by Christian Gan <cgan@iders.ca>
*
* This code is GPL
- *
- * $Id: mtdconcat.c,v 1.9 2004/06/30 15:17:41 dbrown Exp $
*/
-#include <linux/module.h>
-#include <linux/types.h>
#include <linux/kernel.h>
+#include <linux/module.h>
#include <linux/slab.h>
-#include <linux/sched.h> /* TASK_* */
+#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>
+
/*
* Our storage structure:
* Subdev points to an array of pointers to struct mtd_info objects
*/
#define CONCAT(x) ((struct mtd_concat *)(x))
-/*
+/*
* MTD methods which look up the relevant subdevice, translate the
* effective address and pass through to the subdevice.
*/
size_t * retlen, u_char * buf)
{
struct mtd_concat *concat = CONCAT(mtd);
- int err = -EINVAL;
+ int ret = 0, err;
int i;
*retlen = 0;
err = subdev->read(subdev, from, size, &retsize, buf);
- if (err)
- break;
+ /* Save information about bitflips! */
+ if (unlikely(err)) {
+ if (err == -EBADMSG) {
+ mtd->ecc_stats.failed++;
+ ret = err;
+ } else if (err == -EUCLEAN) {
+ mtd->ecc_stats.corrected++;
+ /* Do not overwrite -EBADMSG !! */
+ if (!ret)
+ ret = err;
+ } else
+ return err;
+ }
*retlen += retsize;
len -= size;
if (len == 0)
- break;
+ return ret;
- err = -EINVAL;
buf += size;
from = 0;
}
- return err;
+ return -EINVAL;
}
static int
}
static int
-concat_read_ecc(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf, u_char * eccbuf,
- struct nand_oobinfo *oobsel)
+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);
- int err = -EINVAL;
+ struct kvec *vecs_copy;
+ unsigned long entry_low, entry_high;
+ size_t total_len = 0;
int i;
+ int err = -EINVAL;
- *retlen = 0;
-
- for (i = 0; i < concat->num_subdev; i++) {
- struct mtd_info *subdev = concat->subdev[i];
- size_t size, retsize;
-
- if (from >= subdev->size) {
- /* Not destined for this subdev */
- size = 0;
- from -= subdev->size;
- continue;
- }
-
- if (from + len > subdev->size)
- /* First part goes into this subdev */
- size = subdev->size - from;
- else
- /* Entire transaction goes into this subdev */
- size = len;
+ if (!(mtd->flags & MTD_WRITEABLE))
+ return -EROFS;
- if (subdev->read_ecc)
- err = subdev->read_ecc(subdev, from, size,
- &retsize, buf, eccbuf, oobsel);
- else
- err = -EINVAL;
+ *retlen = 0;
- if (err)
- break;
+ /* Calculate total length of data */
+ for (i = 0; i < count; i++)
+ total_len += vecs[i].iov_len;
- *retlen += retsize;
- len -= size;
- if (len == 0)
- break;
+ /* Do not allow write past end of device */
+ if ((to + total_len) > mtd->size)
+ return -EINVAL;
- err = -EINVAL;
- buf += size;
- if (eccbuf) {
- eccbuf += subdev->oobsize;
- /* in nand.c at least, eccbufs are
- tagged with 2 (int)eccstatus'; we
- must account for these */
- eccbuf += 2 * (sizeof (int));
- }
- from = 0;
+ /* Check alignment */
+ if (mtd->writesize > 1) {
+ uint64_t __to = to;
+ if (do_div(__to, mtd->writesize) || (total_len % mtd->writesize))
+ return -EINVAL;
}
- return err;
-}
-static int
-concat_write_ecc(struct mtd_info *mtd, loff_t to, size_t len,
- size_t * retlen, const u_char * buf, u_char * eccbuf,
- struct nand_oobinfo *oobsel)
-{
- struct mtd_concat *concat = CONCAT(mtd);
- int err = -EINVAL;
- int i;
-
- if (!(mtd->flags & MTD_WRITEABLE))
- return -EROFS;
-
- *retlen = 0;
+ /* make a copy of vecs */
+ vecs_copy = kmalloc(sizeof(struct kvec) * count, GFP_KERNEL);
+ if (!vecs_copy)
+ return -ENOMEM;
+ memcpy(vecs_copy, vecs, sizeof(struct kvec) * count);
+ entry_low = 0;
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- size_t size, retsize;
+ size_t size, wsize, retsize, old_iov_len;
if (to >= subdev->size) {
- size = 0;
to -= subdev->size;
continue;
}
- if (to + len > subdev->size)
- size = subdev->size - to;
- else
- size = len;
+
+ size = min_t(uint64_t, total_len, subdev->size - to);
+ wsize = size; /* store for future use */
+
+ 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;
if (!(subdev->flags & MTD_WRITEABLE))
err = -EROFS;
- else if (subdev->write_ecc)
- err = subdev->write_ecc(subdev, to, size,
- &retsize, buf, eccbuf, oobsel);
else
- err = -EINVAL;
+ err = subdev->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;
- len -= size;
- if (len == 0)
+ total_len -= wsize;
+
+ if (total_len == 0)
break;
err = -EINVAL;
- buf += size;
- if (eccbuf)
- eccbuf += subdev->oobsize;
to = 0;
}
+
+ kfree(vecs_copy);
return err;
}
static int
-concat_read_oob(struct mtd_info *mtd, loff_t from, size_t len,
- size_t * retlen, u_char * buf)
+concat_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
{
struct mtd_concat *concat = CONCAT(mtd);
- int err = -EINVAL;
- int i;
+ struct mtd_oob_ops devops = *ops;
+ int i, err, ret = 0;
- *retlen = 0;
+ ops->retlen = ops->oobretlen = 0;
for (i = 0; i < concat->num_subdev; i++) {
struct mtd_info *subdev = concat->subdev[i];
- size_t size, retsize;
if (from >= subdev->size) {
- /* Not destined for this subdev */
- size = 0;
from -= subdev->size;
continue;
}
- if (from + len > subdev->size)
- /* First part goes into this subdev */
- size = subdev->size - from;
- else
- /* Entire transaction goes into this subdev */
- size = len;
-
- if (subdev->read_oob)
- err = subdev->read_oob(subdev, from, size,
- &retsize, buf);
- else
- err = -EINVAL;
- if (err)
- break;
+ /* partial read ? */
+ if (from + devops.len > subdev->size)
+ devops.len = subdev->size - from;
+
+ err = subdev->read_oob(subdev, from, &devops);
+ ops->retlen += devops.retlen;
+ ops->oobretlen += devops.oobretlen;
+
+ /* Save information about bitflips! */
+ if (unlikely(err)) {
+ if (err == -EBADMSG) {
+ mtd->ecc_stats.failed++;
+ ret = err;
+ } else if (err == -EUCLEAN) {
+ mtd->ecc_stats.corrected++;
+ /* Do not overwrite -EBADMSG !! */
+ if (!ret)
+ ret = err;
+ } else
+ return err;
+ }
- *retlen += retsize;
- len -= size;
- if (len == 0)
- break;
+ 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;
+ }
- err = -EINVAL;
- buf += size;
from = 0;
}
- return err;
+ return -EINVAL;
}
static int
-concat_write_oob(struct mtd_info *mtd, loff_t to, size_t len,
- size_t * retlen, const u_char * buf)
+concat_write_oob(struct mtd_info *mtd, loff_t to, struct mtd_oob_ops *ops)
{
struct mtd_concat *concat = CONCAT(mtd);
- int err = -EINVAL;
- int i;
+ struct mtd_oob_ops devops = *ops;
+ int i, err;
if (!(mtd->flags & MTD_WRITEABLE))
return -EROFS;
- *retlen = 0;
+ ops->retlen = 0;
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;
- if (!(subdev->flags & MTD_WRITEABLE))
- err = -EROFS;
- else if (subdev->write_oob)
- err = subdev->write_oob(subdev, to, size, &retsize,
- buf);
- else
- err = -EINVAL;
+ /* partial write ? */
+ if (to + devops.len > subdev->size)
+ devops.len = subdev->size - to;
+ err = subdev->write_oob(subdev, to, &devops);
+ ops->retlen += devops.retlen;
if (err)
- break;
-
- *retlen += retsize;
- len -= size;
- if (len == 0)
- break;
+ return err;
- err = -EINVAL;
- buf += size;
+ 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 err;
+ return -EINVAL;
}
static void concat_erase_callback(struct erase_info *instr)
struct mtd_concat *concat = CONCAT(mtd);
struct mtd_info *subdev;
int i, err;
- u_int32_t length, offset = 0;
+ uint64_t length, offset = 0;
struct erase_info *erase;
if (!(mtd->flags & MTD_WRITEABLE))
* to-be-erased area begins. Verify that the starting
* offset is aligned to this region's erase size:
*/
- if (instr->addr & (erase_regions[i].erasesize - 1))
+ if (i < 0 || instr->addr & (erase_regions[i].erasesize - 1))
return -EINVAL;
/*
/*
* check if the ending offset is aligned to this region's erase size
*/
- if ((instr->addr + instr->len) & (erase_regions[i].erasesize -
- 1))
+ if (i < 0 || ((instr->addr + instr->len) &
+ (erase_regions[i].erasesize - 1)))
return -EINVAL;
}
- instr->fail_addr = 0xffffffff;
+ instr->fail_addr = MTD_FAIL_ADDR_UNKNOWN;
/* make a local copy of instr to avoid modifying the caller's struct */
erase = kmalloc(sizeof (struct erase_info), GFP_KERNEL);
}
/* must never happen since size limit has been verified above */
- if (i >= concat->num_subdev)
- BUG();
+ BUG_ON(i >= concat->num_subdev);
/* now do the erase: */
err = 0;
if ((err = concat_dev_erase(subdev, erase))) {
/* sanity check: should never happen since
* block alignment has been checked above */
- if (err == -EINVAL)
- BUG();
- if (erase->fail_addr != 0xffffffff)
+ BUG_ON(err == -EINVAL);
+ if (erase->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
instr->fail_addr = erase->fail_addr + offset;
break;
}
return 0;
}
-static int concat_lock(struct mtd_info *mtd, loff_t ofs, size_t len)
+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];
- size_t size;
+ uint64_t size;
if (ofs >= subdev->size) {
size = 0;
return err;
}
-static int concat_unlock(struct mtd_info *mtd, loff_t ofs, size_t len)
+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];
- size_t size;
+ uint64_t size;
if (ofs >= subdev->size) {
size = 0;
}
}
+static int concat_block_isbad(struct mtd_info *mtd, loff_t ofs)
+{
+ struct mtd_concat *concat = CONCAT(mtd);
+ int i, res = 0;
+
+ if (!concat->subdev[0]->block_isbad)
+ return res;
+
+ if (ofs > mtd->size)
+ return -EINVAL;
+
+ for (i = 0; i < concat->num_subdev; i++) {
+ struct mtd_info *subdev = concat->subdev[i];
+
+ if (ofs >= subdev->size) {
+ ofs -= subdev->size;
+ continue;
+ }
+
+ res = subdev->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;
+
+ if (!concat->subdev[0]->block_markbad)
+ return 0;
+
+ if (ofs > mtd->size)
+ return -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 = subdev->block_markbad(subdev, ofs);
+ if (!err)
+ mtd->ecc_stats.badblocks++;
+ break;
+ }
+
+ return err;
+}
+
+/*
+ * try to support NOMMU mmaps on concatenated devices
+ * - we don't support subdev spanning as we can't guarantee it'll work
+ */
+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;
+ }
+
+ /* we've found the subdev over which the mapping will reside */
+ if (offset + len > subdev->size)
+ return (unsigned long) -EINVAL;
+
+ if (subdev->get_unmapped_area)
+ return subdev->get_unmapped_area(subdev, len, offset,
+ flags);
+
+ break;
+ }
+
+ return (unsigned long) -ENOSYS;
+}
+
/*
* This function constructs a virtual MTD device by concatenating
* num_devs MTD devices. A pointer to the new device object is
*/
struct mtd_info *mtd_concat_create(struct mtd_info *subdev[], /* subdevices to concatenate */
int num_devs, /* number of subdevices */
- char *name)
+ const char *name)
{ /* name for the new device */
int i;
size_t size;
struct mtd_concat *concat;
- u_int32_t max_erasesize, curr_erasesize;
+ uint32_t max_erasesize, curr_erasesize;
int num_erase_region;
printk(KERN_NOTICE "Concatenating MTD devices:\n");
/* allocate the device structure */
size = SIZEOF_STRUCT_MTD_CONCAT(num_devs);
- concat = kmalloc(size, GFP_KERNEL);
+ concat = kzalloc(size, GFP_KERNEL);
if (!concat) {
printk
("memory allocation error while creating concatenated device \"%s\"\n",
name);
return NULL;
}
- memset(concat, 0, size);
concat->subdev = (struct mtd_info **) (concat + 1);
/*
concat->mtd.flags = subdev[0]->flags;
concat->mtd.size = subdev[0]->size;
concat->mtd.erasesize = subdev[0]->erasesize;
- concat->mtd.oobblock = subdev[0]->oobblock;
+ concat->mtd.writesize = subdev[0]->writesize;
+ concat->mtd.subpage_sft = subdev[0]->subpage_sft;
concat->mtd.oobsize = subdev[0]->oobsize;
- concat->mtd.ecctype = subdev[0]->ecctype;
- concat->mtd.eccsize = subdev[0]->eccsize;
- if (subdev[0]->read_ecc)
- concat->mtd.read_ecc = concat_read_ecc;
- if (subdev[0]->write_ecc)
- concat->mtd.write_ecc = concat_write_ecc;
+ 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->mtd.backing_dev_info = subdev[0]->backing_dev_info;
concat->subdev[0] = subdev[0];
concat->mtd.flags |=
subdev[i]->flags & MTD_WRITEABLE;
}
+
+ /* only permit direct mapping if the BDIs are all the same
+ * - copy-mapping is still permitted
+ */
+ if (concat->mtd.backing_dev_info !=
+ subdev[i]->backing_dev_info)
+ concat->mtd.backing_dev_info =
+ &default_backing_dev_info;
+
concat->mtd.size += subdev[i]->size;
- if (concat->mtd.oobblock != subdev[i]->oobblock ||
+ 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.ecctype != subdev[i]->ecctype ||
- concat->mtd.eccsize != subdev[i]->eccsize ||
- !concat->mtd.read_ecc != !subdev[i]->read_ecc ||
- !concat->mtd.write_ecc != !subdev[i]->write_ecc ||
!concat->mtd.read_oob != !subdev[i]->read_oob ||
!concat->mtd.write_oob != !subdev[i]->write_oob) {
kfree(concat);
}
+ concat->mtd.ecclayout = subdev[0]->ecclayout;
+
concat->num_subdev = num_devs;
concat->mtd.name = name;
- /*
- * NOTE: for now, we do not provide any readv()/writev() methods
- * because they are messy to implement and they are not
- * used to a great extent anyway.
- */
concat->mtd.erase = concat_erase;
concat->mtd.read = concat_read;
concat->mtd.write = concat_write;
concat->mtd.unlock = concat_unlock;
concat->mtd.suspend = concat_suspend;
concat->mtd.resume = concat_resume;
+ concat->mtd.get_unmapped_area = concat_get_unmapped_area;
/*
* Combine the erase block size info of the subdevices:
concat->mtd.erasesize = curr_erasesize;
concat->mtd.numeraseregions = 0;
} else {
+ uint64_t tmp64;
+
/*
* erase block size varies across the subdevices: allocate
* space to store the data describing the variable erase regions
*/
struct mtd_erase_region_info *erase_region_p;
- u_int32_t begin, position;
+ uint64_t begin, position;
concat->mtd.erasesize = max_erasesize;
concat->mtd.numeraseregions = num_erase_region;
erase_region_p->offset = begin;
erase_region_p->erasesize =
curr_erasesize;
- erase_region_p->numblocks =
- (position - begin) / 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->offset = begin;
erase_region_p->erasesize =
curr_erasesize;
- erase_region_p->numblocks =
- (position -
- begin) / curr_erasesize;
+ tmp64 = position - begin;
+ do_div(tmp64, curr_erasesize);
+ erase_region_p->numblocks = tmp64;
begin = position;
curr_erasesize =
}
position +=
subdev[i]->eraseregions[j].
- numblocks * curr_erasesize;
+ numblocks * (uint64_t)curr_erasesize;
}
}
}
/* Now write the final entry */
erase_region_p->offset = begin;
erase_region_p->erasesize = curr_erasesize;
- erase_region_p->numblocks = (position - begin) / curr_erasesize;
+ tmp64 = position - begin;
+ do_div(tmp64, curr_erasesize);
+ erase_region_p->numblocks = tmp64;
}
return &concat->mtd;
}
-/*
+/*
* This function destroys an MTD object obtained from concat_mtd_devs()
*/
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff