diff options
Diffstat (limited to 'target/linux/generic/backport-5.15/423-v6.1-0003-mtd-add-ECC-error-accounting-for-each-read-request.patch')
| -rw-r--r-- | target/linux/generic/backport-5.15/423-v6.1-0003-mtd-add-ECC-error-accounting-for-each-read-request.patch | 172 |
1 files changed, 172 insertions, 0 deletions
diff --git a/target/linux/generic/backport-5.15/423-v6.1-0003-mtd-add-ECC-error-accounting-for-each-read-request.patch b/target/linux/generic/backport-5.15/423-v6.1-0003-mtd-add-ECC-error-accounting-for-each-read-request.patch new file mode 100644 index 0000000000..f2f45eb7bc --- /dev/null +++ b/target/linux/generic/backport-5.15/423-v6.1-0003-mtd-add-ECC-error-accounting-for-each-read-request.patch @@ -0,0 +1,172 @@ +From 2ed18d818d1f7492172f8dd5904344c7d367e8ed Mon Sep 17 00:00:00 2001 +From: =?UTF-8?q?Micha=C5=82=20K=C4=99pie=C5=84?= <kernel@kempniu.pl> +Date: Wed, 29 Jun 2022 14:57:36 +0200 +Subject: [PATCH 3/4] mtd: add ECC error accounting for each read request +MIME-Version: 1.0 +Content-Type: text/plain; charset=UTF-8 +Content-Transfer-Encoding: 8bit + +Extend struct mtd_req_stats with two new fields holding the number of +corrected bitflips and uncorrectable errors detected during a read +operation. This is a prerequisite for ultimately passing those counters +to user space, where they can be useful to applications for making +better-informed choices about moving data around. + +Unlike 'max_bitflips' (which is set - in a common code path - to the +return value of a function called while the MTD device's mutex is held), +these counters have to be maintained in each MTD driver which defines +the '_read_oob' callback because the statistics need to be calculated +while the MTD device's mutex is held. + +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/20220629125737.14418-4-kernel@kempniu.pl +--- + drivers/mtd/devices/docg3.c | 8 ++++++++ + drivers/mtd/nand/onenand/onenand_base.c | 12 ++++++++++++ + drivers/mtd/nand/raw/nand_base.c | 10 ++++++++++ + drivers/mtd/nand/spi/core.c | 10 ++++++++++ + include/linux/mtd/mtd.h | 2 ++ + 5 files changed, 42 insertions(+) + +--- a/drivers/mtd/devices/docg3.c ++++ b/drivers/mtd/devices/docg3.c +@@ -871,6 +871,7 @@ static int doc_read_oob(struct mtd_info + u8 *buf = ops->datbuf; + size_t len, ooblen, nbdata, nboob; + u8 hwecc[DOC_ECC_BCH_SIZE], eccconf1; ++ struct mtd_ecc_stats old_stats; + int max_bitflips = 0; + + if (buf) +@@ -895,6 +896,7 @@ static int doc_read_oob(struct mtd_info + ret = 0; + skip = from % DOC_LAYOUT_PAGE_SIZE; + mutex_lock(&docg3->cascade->lock); ++ old_stats = mtd->ecc_stats; + while (ret >= 0 && (len > 0 || ooblen > 0)) { + calc_block_sector(from - skip, &block0, &block1, &page, &ofs, + docg3->reliable); +@@ -966,6 +968,12 @@ static int doc_read_oob(struct mtd_info + } + + out: ++ if (ops->stats) { ++ ops->stats->uncorrectable_errors += ++ mtd->ecc_stats.failed - old_stats.failed; ++ ops->stats->corrected_bitflips += ++ mtd->ecc_stats.corrected - old_stats.corrected; ++ } + mutex_unlock(&docg3->cascade->lock); + return ret; + err_in_read: +--- a/drivers/mtd/nand/onenand/onenand_base.c ++++ b/drivers/mtd/nand/onenand/onenand_base.c +@@ -1440,6 +1440,7 @@ static int onenand_read_oob(struct mtd_i + struct mtd_oob_ops *ops) + { + struct onenand_chip *this = mtd->priv; ++ struct mtd_ecc_stats old_stats; + int ret; + + switch (ops->mode) { +@@ -1453,12 +1454,23 @@ static int onenand_read_oob(struct mtd_i + } + + onenand_get_device(mtd, FL_READING); ++ ++ old_stats = mtd->ecc_stats; ++ + if (ops->datbuf) + ret = ONENAND_IS_4KB_PAGE(this) ? + onenand_mlc_read_ops_nolock(mtd, from, ops) : + onenand_read_ops_nolock(mtd, from, ops); + else + ret = onenand_read_oob_nolock(mtd, from, ops); ++ ++ if (ops->stats) { ++ ops->stats->uncorrectable_errors += ++ mtd->ecc_stats.failed - old_stats.failed; ++ ops->stats->corrected_bitflips += ++ mtd->ecc_stats.corrected - old_stats.corrected; ++ } ++ + onenand_release_device(mtd); + + return ret; +--- a/drivers/mtd/nand/raw/nand_base.c ++++ b/drivers/mtd/nand/raw/nand_base.c +@@ -3815,6 +3815,7 @@ static int nand_read_oob(struct mtd_info + struct mtd_oob_ops *ops) + { + struct nand_chip *chip = mtd_to_nand(mtd); ++ struct mtd_ecc_stats old_stats; + int ret; + + ops->retlen = 0; +@@ -3826,11 +3827,20 @@ static int nand_read_oob(struct mtd_info + + nand_get_device(chip); + ++ old_stats = mtd->ecc_stats; ++ + if (!ops->datbuf) + ret = nand_do_read_oob(chip, from, ops); + else + ret = nand_do_read_ops(chip, from, ops); + ++ if (ops->stats) { ++ ops->stats->uncorrectable_errors += ++ mtd->ecc_stats.failed - old_stats.failed; ++ ops->stats->corrected_bitflips += ++ mtd->ecc_stats.corrected - old_stats.corrected; ++ } ++ + nand_release_device(chip); + return ret; + } +--- a/drivers/mtd/nand/spi/core.c ++++ b/drivers/mtd/nand/spi/core.c +@@ -629,6 +629,7 @@ static int spinand_mtd_read(struct mtd_i + { + struct spinand_device *spinand = mtd_to_spinand(mtd); + struct nand_device *nand = mtd_to_nanddev(mtd); ++ struct mtd_ecc_stats old_stats; + unsigned int max_bitflips = 0; + struct nand_io_iter iter; + bool disable_ecc = false; +@@ -640,6 +641,8 @@ static int spinand_mtd_read(struct mtd_i + + mutex_lock(&spinand->lock); + ++ old_stats = mtd->ecc_stats; ++ + nanddev_io_for_each_page(nand, NAND_PAGE_READ, from, ops, &iter) { + if (disable_ecc) + iter.req.mode = MTD_OPS_RAW; +@@ -662,6 +665,13 @@ static int spinand_mtd_read(struct mtd_i + ops->oobretlen += iter.req.ooblen; + } + ++ if (ops->stats) { ++ ops->stats->uncorrectable_errors += ++ mtd->ecc_stats.failed - old_stats.failed; ++ ops->stats->corrected_bitflips += ++ mtd->ecc_stats.corrected - old_stats.corrected; ++ } ++ + mutex_unlock(&spinand->lock); + + if (ecc_failed && !ret) +--- a/include/linux/mtd/mtd.h ++++ b/include/linux/mtd/mtd.h +@@ -41,6 +41,8 @@ struct mtd_erase_region_info { + }; + + struct mtd_req_stats { ++ unsigned int uncorrectable_errors; ++ unsigned int corrected_bitflips; + unsigned int max_bitflips; + }; + |