From: Boris Brezillon <boris.brezillon@free-electrons.com>
To: David Woodhouse <dwmw2@infradead.org>,
Brian Norris <computersforpeace@gmail.com>,
linux-mtd@lists.infradead.org
Cc: Daniel Mack <daniel@zonque.org>,
Haojian Zhuang <haojian.zhuang@gmail.com>,
Robert Jarzmik <robert.jarzmik@free.fr>,
Kukjin Kim <kgene@kernel.org>,
Krzysztof Kozlowski <k.kozlowski@samsung.com>,
linux-samsung-soc@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
Ralf Baechle <ralf@linux-mips.org>,
linux-mips@linux-mips.org, Josh Wu <josh.wu@atmel.com>,
Ezequiel Garcia <ezequiel.garcia@free-electrons.com>,
Maxime Ripard <maxime.ripard@free-electrons.com>,
Chen-Yu Tsai <wens@csie.org>,
linux-sunxi@googlegroups.com, Stefan Agner <stefan@agner.ch>,
Kyungmin Park <kyungmin.park@samsung.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org,
punnaiah choudary kalluri <punnaia@xilinx.com>,
Priit Laes <plaes@plaes.org>
Subject: Re: [PATCH v2 05/51] mtd: add mtd_ooblayout_xxx() helper functions
Date: Fri, 5 Feb 2016 10:27:10 +0100 [thread overview]
Message-ID: <20160205102710.39fa4244@bbrezillon> (raw)
In-Reply-To: <1454580434-32078-6-git-send-email-boris.brezillon@free-electrons.com>
On Thu, 4 Feb 2016 11:06:28 +0100
Boris Brezillon <boris.brezillon@free-electrons.com> wrote:
> In order to make the ecclayout definition completely dynamic we need to
> rework the way the OOB layout are defined and iterated.
>
> Create a few mtd_ooblayout_xxx() helpers to ease OOB bytes manipulation
> and hide ecclayout internals to their users.
>
> Signed-off-by: Boris Brezillon <boris.brezillon@free-electrons.com>
> ---
> drivers/mtd/mtdcore.c | 401 ++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mtd/mtd.h | 33 ++++
> 2 files changed, 434 insertions(+)
>
> diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
> index 3096251..14e46ca 100644
> --- a/drivers/mtd/mtdcore.c
> +++ b/drivers/mtd/mtdcore.c
> @@ -997,6 +997,407 @@ int mtd_read_oob(struct mtd_info *mtd, loff_t from, struct mtd_oob_ops *ops)
> }
> EXPORT_SYMBOL_GPL(mtd_read_oob);
>
> +/**
> + * mtd_ooblayout_ecc - Get the OOB region definition of a specific ECC section
> + * @mtd: MTD device structure
> + * @section: ECC section. Depending on the layout you may have all the ECC
> + * bytes stored in a single contiguous section, or one section
> + * per ECC chunk (and sometime several sections for a single ECC
> + * ECC chunk)
> + * @oobecc: OOB region struct filled with the appropriate ECC position
> + * information
> + *
> + * This functions return ECC section information in the OOB area. I you want
> + * to get all the ECC bytes information, then you should call
> + * mtd_ooblayout_ecc(mtd, section++, oobecc) until it returns -ERANGE.
> + *
> + * Returns zero on success, a negative error code otherwise.
> + */
> +int mtd_ooblayout_ecc(struct mtd_info *mtd, int section,
> + struct mtd_oob_region *oobecc)
> +{
> + int eccbyte = 0, cursection = 0, length = 0, eccpos = 0;
> +
> + memset(oobecc, 0, sizeof(*oobecc));
> +
> + if (!mtd || section < 0)
> + return -EINVAL;
> +
> + if (!mtd->ecclayout)
> + return -ENOTSUPP;
> +
> + if (mtd->ecclayout->eccbytes < 1)
> + return -ERANGE;
> +
> + /*
> + * This logic allows us to reuse the ->ecclayout information and
> + * expose them as ECC regions (as done for the OOB free regions).
> + *
> + * TODO: this should be dropped as soon as we get rid of the
> + * ->ecclayout field.
> + */
> + for (eccbyte = 0; eccbyte < mtd->ecclayout->eccbytes; eccbyte++) {
> + eccpos = mtd->ecclayout->eccpos[eccbyte];
> +
> + if (eccbyte < mtd->ecclayout->eccbytes - 1) {
> + int neccpos = mtd->ecclayout->eccpos[eccbyte + 1];
> +
> + if (eccpos + 1 == neccpos) {
> + length++;
> + continue;
> + }
> + }
> +
> + if (section == cursection)
> + break;
> +
> + length = 0;
> + cursection++;
> + }
> +
> + if (cursection != section)
Should be
if (cursection != section ||
eccbyte >= mtd->ecclayout->eccbytes)
Will fix that too.
> + return -ERANGE;
> +
> + oobecc->length = length + 1;
> + oobecc->offset = eccpos - length;
> +
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(mtd_ooblayout_ecc);
--
Boris Brezillon, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
next prev parent reply other threads:[~2016-02-05 9:27 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-04 10:06 [PATCH v2 00/51] mtd: rework ECC layout definition Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 01/51] mtd: kill the ecclayout->oobavail field Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 02/51] mtd: create an mtd_oobavail() helper and make use of it Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 03/51] mtd: mtdswap: remove useless if (!mtd->ecclayout) test Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 04/51] mtd: nand: simplify nand_bch_init() usage Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 05/51] mtd: add mtd_ooblayout_xxx() helper functions Boris Brezillon
2016-02-05 7:35 ` Boris Brezillon
2016-02-05 9:27 ` Boris Brezillon [this message]
2016-02-04 10:06 ` [PATCH v2 06/51] mtd: use mtd_ooblayout_xxx() helpers where appropriate Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 07/51] mtd: nand: core: " Boris Brezillon
2016-02-05 9:31 ` Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 08/51] mtd: nand: atmel: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 09/51] mtd: nand: fsl_ifc: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 10/51] mtd: nand: gpmi: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 11/51] mtd: nand: lpc32xx: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 12/51] mtd: nand: omap2: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 13/51] mtd: onenand: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 14/51] mtd: add mtd_set_ecclayout() helper function Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 15/51] mtd: use mtd_set_ecclayout() where appropriate Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 16/51] mtd: nand: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 17/51] mtd: onenand: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 18/51] mtd: docg3: " Boris Brezillon
2016-02-06 21:55 ` Robert Jarzmik
2016-02-04 10:06 ` [PATCH v2 19/51] mtd: create an mtd_ooblayout_ops struct to ease ECC layout definition Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 20/51] mtd: docg3: switch to mtd_ooblayout_ops Boris Brezillon
2016-02-06 21:57 ` Robert Jarzmik
2016-02-04 10:06 ` [PATCH v2 21/51] mtd: nand: implement the default mtd_ooblayout_ops Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 22/51] mtd: nand: bch: switch to mtd_ooblayout_ops Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 23/51] mtd: nand: sharpsl: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 24/51] mtd: nand: jz4740: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 25/51] mtd: nand: atmel: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 26/51] mtd: nand: bf5xx: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 27/51] mtd: nand: brcm: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 28/51] mtd: nand: cafe: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 29/51] mtd: nand: davinci: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 30/51] mtd: nand: denali: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 31/51] mtd: nand: diskonchip: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 32/51] mtd: nand: docg4: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 33/51] mtd: nand: fsl_elbc: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 34/51] mtd: nand: fsl_ifc: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 35/51] mtd: nand: fsmc: " Boris Brezillon
2016-02-04 10:06 ` [PATCH v2 36/51] mtd: nand: gpmi: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 37/51] mtd: nand: hisi504: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 38/51] mtd: nand: jz4780: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 39/51] mtd: nand: lpc32xx: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 40/51] mtd: nand: mxc: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 41/51] mtd: nand: omap2: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 42/51] mtd: nand: pxa3xx: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 43/51] mtd: nand: s3c2410: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 44/51] mtd: nand: sh_flctl: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 45/51] mtd: nand: sm_common: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 46/51] mtd: nand: sunxi: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 47/51] mtd: nand: vf610: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 48/51] mtd: onenand: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 49/51] staging: mt29f_spinand: " Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 50/51] mtd: nand: kill the ecc->layout field Boris Brezillon
2016-02-04 10:07 ` [PATCH v2 51/51] mtd: kill the nand_ecclayout struct Boris Brezillon
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