[PATCH v5 0/5] mtd: use ONFI bad blocks per LUN to calculate UBI bad PEB limit

From: Zach Brown
Date: Mon Nov 07 2016 - 11:40:41 EST

For ONFI-compliant NAND devices, the ONFI parameters report the maximum number
of bad blocks per LUN that will be encountered over the lifetime of the device,
so we can use that information to get a more accurate (and smaller) value for
the UBI bad PEB limit.

The ONFI parameter "maxiumum number of bad blocks per LUN" is the max number of
bad blocks that each individual LUN will ever ecounter. It is not the number of
bad blocks to reserve for the nand device per LUN in the device.

This means that in the worst case a UBI device spanning X LUNs will encounter
"maximum number of bad blocks per LUN" * X bad blocks. The implementation in
this patch assumes this worst case and allocates bad block accordingly.

These patches are ordered in terms of their dependencies, but ideally, all 5
would need to be applied for this to work as intended.

* Changed commit message to address concerns from v1[1] about this patch set
making best case assumptions.
* Provided helper function for _max_bad_blocks
* Two new patches
* First new patch adds bb_per_lun and blocks_per_lun to nand_chip struct
* Second new patch sets the new fields during nand_flash_detect_onfi
* Max bad blocks calculation now uses the new nand_chip fields
* Changed bb_per_lun and blocks_per_lun to bb_per_die and blocks_per_die
* Corrected type of bb_per_die and blocks_per_die from little endian to host
unsigned int
* Changed bb_per_die to max_bb_per_die
* Fixed spacing style issue


Jeff Westfahl (2):
mtd: introduce function max_bad_blocks
mtd: ubi: use 'max_bad_blocks' to compute bad_peb_limit if available

Zach Brown (3):
mtd: nand: Add max_bb_per_die and blocks_per_die fields to nand_chip
mtd: nand: implement 'max_bad_blocks' mtd function
mtd: nand: set max_bb_per_die and blocks_per_die for ONFI compliant

drivers/mtd/mtdpart.c | 12 ++++++++++++
drivers/mtd/nand/nand_base.c | 38 ++++++++++++++++++++++++++++++++++++++
drivers/mtd/ubi/build.c | 4 ++++
include/linux/mtd/mtd.h | 11 +++++++++++
include/linux/mtd/nand.h | 5 +++++
5 files changed, 70 insertions(+)