kernel/linux.git/include/linux/mtd/mtd.h, branch v5.17.9

mtd: fix 'part' field data corruption in mtd_info

2022-05-09T07:16:21+00:00

[ Upstream commit 37c5f9e80e015d0df17d0c377c18523002986851 ] Commit 46b5889cc2c5 ("mtd: implement proper partition handling") started using "mtd_get_master_ofs()" in mtd callbacks to determine memory offsets by means of 'part' field from mtd_info, what previously was smashed accessing 'master' field in the mtd_set_dev_defaults() method. That provides wrong offset what causes hardware access errors. Just make 'part', 'master' as separate fields, rather than using union type to avoid 'part' data corruption when mtd_set_dev_defaults() is called. Fixes: 46b5889cc2c5 ("mtd: implement proper partition handling") Signed-off-by: Oleksandr Ocheretnyi Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20220417184649.449289-1-oocheret@cisco.com Signed-off-by: Sasha Levin

mtd: Introduce an expert mode for forensics and debugging purposes

2021-12-09T16:51:59+00:00

When developping NAND controller drivers or when debugging filesystem corruptions, it is quite common to need hacking locally into the MTD/NAND core in order to get access to the content of the bad blocks. Instead of having multiple implementations out there let's provide a simple yet effective specific MTD-wide debugfs entry to fully disable these checks on purpose. A warning is added to inform the user when this mode gets enabled. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20211118114659.1282855-1-miquel.raynal@bootlin.com

mtd: Remove obsolete macros only used by the old nand_ecclayout struct

2021-09-14T17:34:28+00:00

All uses of MTD_MAX_{OOBFREE,ECCPOS}_ENTRIES_LARGE have been removed as commit ef5eeea6e911 ("mtd: nand: brcm: switch to mtd_ooblayout_ops") and commit aab616e31d1c ("mtd: kill the nand_ecclayout struct") replaced struct nand_ecclayout by the new mtd_ooblayout_ops interface. Remove these two macros therefore. Reported-by: Yi Yang Signed-off-by: GONG, Ruiqi Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210830083356.31702-1-gongruiqi1@huawei.com

mtd: core: add OTP nvmem provider support

2021-05-10T10:42:55+00:00

Flash OTP regions can already be read via user space. Some boards have their serial number or MAC addresses stored in the OTP regions. Add support for them being a (read-only) nvmem provider. The API to read the OTP data is already in place. It distinguishes between factory and user OTP, thus there are up to two different providers. Signed-off-by: Michael Walle Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210424110608.15748-6-michael@walle.cc

mtd: core: Constify buf in mtd_write_user_prot_reg()

2021-04-16T18:30:54+00:00

The write buffer comes from user and should be const. Constify write buffer in mtd core and across all _write_user_prot_reg() users. cfi_cmdset_{0001, 0002} and onenand_base will pay the cost of an explicit cast to discard the const qualifier since the beginning, since they are using an otp_op_t function prototype that is used for both reads and writes. mtd_dataflash and SPI NOR will benefit of the const buffer because they are using different paths for writes and reads. Signed-off-by: Tudor Ambarus Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210403060931.7119-1-tudor.ambarus@microchip.com

mtd: add OTP (one-time-programmable) erase ioctl

2021-03-28T17:24:54+00:00

This may sound like a contradiction but some SPI-NOR flashes really support erasing their OTP region until it is finally locked. Having the possibility to erase an OTP region might come in handy during development. The ioctl argument follows the OTPLOCK style. Signed-off-by: Michael Walle Acked-by: Vignesh Raghavendra Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210303201819.2752-1-michael@walle.cc

mtd: char: Get rid of Big MTD Lock

2021-03-11T08:37:49+00:00

Get rid of central chrdev MTD lock, which prevents simultaneous operations on completely independent physical MTD chips. Replace it with newly introduced per-master mutex. Signed-off-by: Alexander Sverdlin Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20210217211845.43364-2-alexander.sverdlin@nokia.com

mtd: Add support for emulated SLC mode on MLC NANDs

2020-05-11T07:51:41+00:00

MLC NANDs can be made a bit more reliable if we only program the lower page of each pair. At least, this solves the paired-pages corruption issue. Signed-off-by: Boris Brezillon Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200503155341.16712-5-miquel.raynal@bootlin.com

mtd: implement proper partition handling

2020-03-11T13:49:30+00:00

Instead of collecting partitions in a flat list, create a hierarchy within the mtd_info structure: use a partitions list to keep track of the partitions of an MTD device (which might be itself a partition of another MTD device), a pointer to the parent device (NULL when the MTD device is the root one, not a partition). By also saving directly in mtd_info the offset of the partition, we can get rid of the mtd_part structure. While at it, be consistent in the naming of the mtd_info structures to ease the understanding of the new hierarchy: these structures are usually called 'mtd', unless there are multiple instances of the same structure. In this case, there is usually a parent/child bound so we will call them 'parent' and 'child'. Signed-off-by: Miquel Raynal Link: https://lore.kernel.org/linux-mtd/20200114090952.11232-1-miquel.raynal@bootlin.com

mtd: mtdcore: add debugfs nodes for querying the flash name and id

2019-08-29T07:36:47+00:00

Currently, we don't have vfs nodes for querying the underlying flash name and flash id. This information is important especially when we want to know the flash detail of the defective system. In order to support the query, we add mtd_debugfs_populate() to create two debugfs nodes (ie. partname and partid). The upper driver can assign the pointer to partname and partid before calling mtd_device_register(). Signed-off-by: Zhuohao Lee Reviewed-by: Boris Brezillon Signed-off-by: Tudor Ambarus