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UBI: introduce new bad PEB limit
Introduce 'ubi->bad_peb_limit', which specifies an upper limit of PEBs UBI expects to go bad. Currently, it is initialized to a fixed percentage of total PEBs in the UBI device (configurable via CONFIG_MTD_UBI_BEB_LIMIT). The 'bad_peb_limit' is intended to be used for calculating the amount of PEBs UBI needs to reserve for bad eraseblock handling. Artem: minor amendments. Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com> Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@linux.intel.com>
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@ -34,13 +34,25 @@ config MTD_UBI_BEB_RESERVE
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help
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If the MTD device admits of bad eraseblocks (e.g. NAND flash), UBI
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reserves some amount of physical eraseblocks to handle new bad
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eraseblocks. For example, if a flash physical eraseblock becomes bad,
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UBI uses these reserved physical eraseblocks to relocate the bad one.
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This option specifies how many physical eraseblocks will be reserved
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for bad eraseblock handling (percents of total number of good flash
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eraseblocks). If the underlying flash does not admit of bad
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eraseblocks (e.g. NOR flash), this value is ignored and nothing is
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reserved. Leave the default value if unsure.
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eraseblocks. When a physical eraseblock becomes bad, UBI uses these
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reserved physical eraseblocks to relocate the bad one. This
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configuration option specifies how many physical eraseblocks will be
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reserved for bad eraseblock handling (percents of total number of
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good physical eraseblocks on this MTD partition). If the underlying
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flash does not admit of bad eraseblocks (e.g. NOR flash), this value
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is ignored and nothing is reserved. Leave the default value if
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unsure.
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config MTD_UBI_BEB_LIMIT
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int "Percentage of maximum expected bad eraseblocks"
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default 2
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range 0 25
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help
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This option specifies the maximum bad physical eraseblocks UBI
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expects on the UBI device (percents of total number of physical
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eraseblocks on this MTD partition). If the underlying flash does not
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admit of bad eraseblocks (e.g. NOR flash), this value is ignored.
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Leave the default value if unsure.
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config MTD_UBI_GLUEBI
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tristate "MTD devices emulation driver (gluebi)"
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@ -607,8 +607,18 @@ static int io_init(struct ubi_device *ubi)
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ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
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ubi->flash_size = ubi->mtd->size;
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if (mtd_can_have_bb(ubi->mtd))
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if (mtd_can_have_bb(ubi->mtd)) {
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ubi->bad_allowed = 1;
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if (CONFIG_MTD_UBI_BEB_LIMIT > 0) {
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int percent = CONFIG_MTD_UBI_BEB_LIMIT;
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int limit = mult_frac(ubi->peb_count, percent, 100);
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/* Round it up */
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if (mult_frac(limit, 100, percent) < ubi->peb_count)
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limit += 1;
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ubi->bad_peb_limit = limit;
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}
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}
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if (ubi->mtd->type == MTD_NORFLASH) {
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ubi_assert(ubi->mtd->writesize == 1);
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@ -363,6 +363,7 @@ struct ubi_wl_entry;
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* @flash_size: underlying MTD device size (in bytes)
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* @peb_count: count of physical eraseblocks on the MTD device
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* @peb_size: physical eraseblock size
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* @bad_peb_limit: top limit of expected bad physical eraseblocks
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* @bad_peb_count: count of bad physical eraseblocks
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* @good_peb_count: count of good physical eraseblocks
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* @corr_peb_count: count of corrupted physical eraseblocks (preserved and not
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@ -410,6 +411,7 @@ struct ubi_device {
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int avail_pebs;
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int beb_rsvd_pebs;
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int beb_rsvd_level;
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int bad_peb_limit;
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int autoresize_vol_id;
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int vtbl_slots;
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