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| author | Michał Kępień <kernel@kempniu.pl> | 2022-06-29 14:57:34 +0200 |
|---|---|---|
| committer | Miquel Raynal <miquel.raynal@bootlin.com> | 2022-09-21 10:38:05 +0200 |
| commit | 65394169bdae073bfb2c6816f5bf095bd7d53e61 (patch) | |
| tree | 8b0070a20c79e9139d62b1edfc65ee8971db7cc0 /drivers/mtd/mtdcore.c | |
| parent | 9ee67182309290aee8135b2b464d0240afe63a28 (diff) | |
| download | linux-stable-65394169bdae073bfb2c6816f5bf095bd7d53e61.tar.gz linux-stable-65394169bdae073bfb2c6816f5bf095bd7d53e61.tar.bz2 linux-stable-65394169bdae073bfb2c6816f5bf095bd7d53e61.zip | |
mtd: track maximum number of bitflips for each read request
mtd_read_oob() callers are currently oblivious to the details of ECC
errors detected during the read operation - they only learn (through the
return value) whether any corrected bitflips or uncorrectable errors
occurred. More detailed ECC information can be useful to user-space
applications for making better-informed choices about moving data
around.
Extend struct mtd_oob_ops with a pointer to a newly-introduced struct
mtd_req_stats and set its 'max_bitflips' field to the maximum number of
bitflips found in a single ECC step during the read operation performed
by mtd_read_oob(). This is a prerequisite for ultimately passing that
value back to user space.
Suggested-by: Boris Brezillon <boris.brezillon@collabora.com>
Signed-off-by: Michał Kępień <kernel@kempniu.pl>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Link: https://lore.kernel.org/linux-mtd/20220629125737.14418-2-kernel@kempniu.pl
Diffstat (limited to 'drivers/mtd/mtdcore.c')
| -rw-r--r-- | drivers/mtd/mtdcore.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c index a9b8be9f40dc..8393319b7782 100644 --- a/drivers/mtd/mtdcore.c +++ b/drivers/mtd/mtdcore.c @@ -1624,6 +1624,9 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) if (!master->_read_oob && (!master->_read || ops->oobbuf)) return -EOPNOTSUPP; + if (ops->stats) + memset(ops->stats, 0, sizeof(*ops->stats)); + if (mtd->flags & MTD_SLC_ON_MLC_EMULATION) ret_code = mtd_io_emulated_slc(mtd, from, true, ops); else @@ -1641,6 +1644,8 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops) return ret_code; if (mtd->ecc_strength == 0) return 0; /* device lacks ecc */ + if (ops->stats) + ops->stats->max_bitflips = ret_code; return ret_code >= mtd->bitflip_threshold ? -EUCLEAN : 0; } EXPORT_SYMBOL_GPL(mtd_read_oob); |