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Date: Tue, 22 Jan 2019 14:18:57 +0100
From: Boris Brezillon <bbrezillon@...nel.org>
To: Schrempf Frieder <frieder.schrempf@...tron.de>
Cc: "boris.brezillon@...tlin.com" <boris.brezillon@...tlin.com>,
"miquel.raynal@...tlin.com" <miquel.raynal@...tlin.com>,
"richard@....at" <richard@....at>,
Kyungmin Park <kyungmin.park@...sung.com>,
David Woodhouse <dwmw2@...radead.org>,
Brian Norris <computersforpeace@...il.com>,
Marek Vasut <marek.vasut@...il.com>,
"linux-mtd@...ts.infradead.org" <linux-mtd@...ts.infradead.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 1/4] mtd: nand: Always store info about bad block
markers in chip struct
On Tue, 22 Jan 2019 11:23:29 +0000
Schrempf Frieder <frieder.schrempf@...tron.de> wrote:
> From: Frieder Schrempf <frieder.schrempf@...tron.de>
>
> The information about where the manufacturer puts the bad block
> markers inside the bad block and in the OOB data is stored in
> different places. Let's move this information to nand_chip.options
> and nand_chip.badblockpos.
>
> As this chip-specific information is not directly related to the
> bad block table (BBT) and to make them more flexible, we also rename
> the flags and create separate flags for storing the BBM in the first
> and the second page instead of the combined flag.
The separation for first and second page flags should IMO be done in a
separate patch. Looks good otherwise.
>
> Signed-off-by: Frieder.Schrempf <frieder.schrempf@...tron.de>
> ---
> drivers/mtd/nand/onenand/onenand_base.c | 2 +-
> drivers/mtd/nand/onenand/onenand_bbt.c | 2 +-
> drivers/mtd/nand/raw/nand_amd.c | 2 +-
> drivers/mtd/nand/raw/nand_base.c | 14 ++++++++------
> drivers/mtd/nand/raw/nand_bbt.c | 5 +++--
> drivers/mtd/nand/raw/nand_esmt.c | 2 +-
> drivers/mtd/nand/raw/nand_hynix.c | 4 ++--
> drivers/mtd/nand/raw/nand_macronix.c | 2 +-
> drivers/mtd/nand/raw/nand_micron.c | 2 +-
> drivers/mtd/nand/raw/nand_samsung.c | 4 ++--
> drivers/mtd/nand/raw/nand_toshiba.c | 2 +-
> drivers/mtd/nand/raw/sh_flctl.c | 4 ++--
> include/linux/mtd/bbm.h | 14 +-------------
> include/linux/mtd/rawnand.h | 16 ++++++++++++++++
> 14 files changed, 41 insertions(+), 34 deletions(-)
>
> diff --git a/drivers/mtd/nand/onenand/onenand_base.c b/drivers/mtd/nand/onenand/onenand_base.c
> index 4ca4b194e7d7..d6701b8f031f 100644
> --- a/drivers/mtd/nand/onenand/onenand_base.c
> +++ b/drivers/mtd/nand/onenand/onenand_base.c
> @@ -2458,7 +2458,7 @@ static int onenand_default_block_markbad(struct mtd_info *mtd, loff_t ofs)
> bbm->bbt[block >> 2] |= 0x01 << ((block & 0x03) << 1);
>
> /* We write two bytes, so we don't have to mess with 16-bit access */
> - ofs += mtd->oobsize + (bbm->badblockpos & ~0x01);
> + ofs += mtd->oobsize + (this->badblockpos & ~0x01);
> /* FIXME : What to do when marking SLC block in partition
> * with MLC erasesize? For now, it is not advisable to
> * create partitions containing both SLC and MLC regions.
> diff --git a/drivers/mtd/nand/onenand/onenand_bbt.c b/drivers/mtd/nand/onenand/onenand_bbt.c
> index dde20487937d..880b0abd36c8 100644
> --- a/drivers/mtd/nand/onenand/onenand_bbt.c
> +++ b/drivers/mtd/nand/onenand/onenand_bbt.c
> @@ -191,7 +191,7 @@ static int onenand_scan_bbt(struct mtd_info *mtd, struct nand_bbt_descr *bd)
> return -ENOMEM;
>
> /* Set the bad block position */
> - bbm->badblockpos = ONENAND_BADBLOCK_POS;
> + this->badblockpos = NAND_BBM_POS_ONENAND;
>
> /* Set erase shift */
> bbm->bbt_erase_shift = this->erase_shift;
> diff --git a/drivers/mtd/nand/raw/nand_amd.c b/drivers/mtd/nand/raw/nand_amd.c
> index 890c5b43e03c..6202cbf7ee8d 100644
> --- a/drivers/mtd/nand/raw/nand_amd.c
> +++ b/drivers/mtd/nand/raw/nand_amd.c
> @@ -40,7 +40,7 @@ static void amd_nand_decode_id(struct nand_chip *chip)
> static int amd_nand_init(struct nand_chip *chip)
> {
> if (nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> return 0;
> }
> diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
> index cca4b24d2ffa..9ef7b86cdc42 100644
> --- a/drivers/mtd/nand/raw/nand_base.c
> +++ b/drivers/mtd/nand/raw/nand_base.c
> @@ -298,11 +298,12 @@ static int nand_block_bad(struct nand_chip *chip, loff_t ofs)
> int page, page_end, res;
> u8 bad;
>
> - if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
> + if (chip->options & NAND_BBM_LASTPAGE)
> ofs += mtd->erasesize - mtd->writesize;
>
> page = (int)(ofs >> chip->page_shift) & chip->pagemask;
> - page_end = page + (chip->bbt_options & NAND_BBT_SCAN2NDPAGE ? 2 : 1);
> + page_end = page + (((chip->options & NAND_BBM_FIRSTPAGE) &&
> + (chip->options & NAND_BBM_SECONDPAGE)) ? 2 : 1);
>
> for (; page < page_end; page++) {
> res = chip->ecc.read_oob(chip, page);
> @@ -541,7 +542,7 @@ static int nand_default_block_markbad(struct nand_chip *chip, loff_t ofs)
> ops.mode = MTD_OPS_PLACE_OOB;
>
> /* Write to first/last page(s) if necessary */
> - if (chip->bbt_options & NAND_BBT_SCANLASTPAGE)
> + if (chip->options & NAND_BBM_LASTPAGE)
> ofs += mtd->erasesize - mtd->writesize;
> do {
> res = nand_do_write_oob(chip, ofs, &ops);
> @@ -550,7 +551,8 @@ static int nand_default_block_markbad(struct nand_chip *chip, loff_t ofs)
>
> i++;
> ofs += mtd->writesize;
> - } while ((chip->bbt_options & NAND_BBT_SCAN2NDPAGE) && i < 2);
> + } while ((chip->options & NAND_BBM_FIRSTPAGE) &&
> + (chip->options & NAND_BBM_SECONDPAGE) && i < 2);
>
> return ret;
> }
> @@ -4576,9 +4578,9 @@ static void nand_decode_bbm_options(struct nand_chip *chip)
>
> /* Set the bad block position */
> if (mtd->writesize > 512 || (chip->options & NAND_BUSWIDTH_16))
> - chip->badblockpos = NAND_LARGE_BADBLOCK_POS;
> + chip->badblockpos = NAND_BBM_POS_LARGE;
> else
> - chip->badblockpos = NAND_SMALL_BADBLOCK_POS;
> + chip->badblockpos = NAND_BBM_POS_SMALL;
> }
>
> static inline bool is_full_id_nand(struct nand_flash_dev *type)
> diff --git a/drivers/mtd/nand/raw/nand_bbt.c b/drivers/mtd/nand/raw/nand_bbt.c
> index 1b722fe9213c..c095c04d566d 100644
> --- a/drivers/mtd/nand/raw/nand_bbt.c
> +++ b/drivers/mtd/nand/raw/nand_bbt.c
> @@ -466,7 +466,8 @@ static int create_bbt(struct nand_chip *this, uint8_t *buf,
>
> pr_info("Scanning device for bad blocks\n");
>
> - if (bd->options & NAND_BBT_SCAN2NDPAGE)
> + if ((this->options & NAND_BBM_FIRSTPAGE) &&
> + (this->options & NAND_BBM_SECONDPAGE))
> numpages = 2;
> else
> numpages = 1;
> @@ -487,7 +488,7 @@ static int create_bbt(struct nand_chip *this, uint8_t *buf,
> from = (loff_t)startblock << this->bbt_erase_shift;
> }
>
> - if (this->bbt_options & NAND_BBT_SCANLASTPAGE)
> + if (this->bbt_options & NAND_BBM_LASTPAGE)
> from += mtd->erasesize - (mtd->writesize * numpages);
>
> for (i = startblock; i < numblocks; i++) {
> diff --git a/drivers/mtd/nand/raw/nand_esmt.c b/drivers/mtd/nand/raw/nand_esmt.c
> index 96f039a83bc8..99a8092969a7 100644
> --- a/drivers/mtd/nand/raw/nand_esmt.c
> +++ b/drivers/mtd/nand/raw/nand_esmt.c
> @@ -36,7 +36,7 @@ static void esmt_nand_decode_id(struct nand_chip *chip)
> static int esmt_nand_init(struct nand_chip *chip)
> {
> if (nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> return 0;
> }
> diff --git a/drivers/mtd/nand/raw/nand_hynix.c b/drivers/mtd/nand/raw/nand_hynix.c
> index 343f477362d1..e685d70c1618 100644
> --- a/drivers/mtd/nand/raw/nand_hynix.c
> +++ b/drivers/mtd/nand/raw/nand_hynix.c
> @@ -672,9 +672,9 @@ static int hynix_nand_init(struct nand_chip *chip)
> int ret;
>
> if (!nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
> + chip->options |= NAND_BBM_LASTPAGE;
> else
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> hynix = kzalloc(sizeof(*hynix), GFP_KERNEL);
> if (!hynix)
> diff --git a/drivers/mtd/nand/raw/nand_macronix.c b/drivers/mtd/nand/raw/nand_macronix.c
> index 47d8cda547cf..e287e71347c5 100644
> --- a/drivers/mtd/nand/raw/nand_macronix.c
> +++ b/drivers/mtd/nand/raw/nand_macronix.c
> @@ -62,7 +62,7 @@ static void macronix_nand_fix_broken_get_timings(struct nand_chip *chip)
> static int macronix_nand_init(struct nand_chip *chip)
> {
> if (nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> macronix_nand_fix_broken_get_timings(chip);
>
> diff --git a/drivers/mtd/nand/raw/nand_micron.c b/drivers/mtd/nand/raw/nand_micron.c
> index b85e1c13b79e..ca80e09783c7 100644
> --- a/drivers/mtd/nand/raw/nand_micron.c
> +++ b/drivers/mtd/nand/raw/nand_micron.c
> @@ -448,7 +448,7 @@ static int micron_nand_init(struct nand_chip *chip)
> goto err_free_manuf_data;
>
> if (mtd->writesize == 2048)
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> ondie = micron_supports_on_die_ecc(chip);
>
> diff --git a/drivers/mtd/nand/raw/nand_samsung.c b/drivers/mtd/nand/raw/nand_samsung.c
> index e46d4c492ad8..ace50522dd19 100644
> --- a/drivers/mtd/nand/raw/nand_samsung.c
> +++ b/drivers/mtd/nand/raw/nand_samsung.c
> @@ -121,9 +121,9 @@ static int samsung_nand_init(struct nand_chip *chip)
> chip->options |= NAND_SAMSUNG_LP_OPTIONS;
>
> if (!nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCANLASTPAGE;
> + chip->options |= NAND_BBM_LASTPAGE;
> else
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> return 0;
> }
> diff --git a/drivers/mtd/nand/raw/nand_toshiba.c b/drivers/mtd/nand/raw/nand_toshiba.c
> index d068163b64b3..0031e6727193 100644
> --- a/drivers/mtd/nand/raw/nand_toshiba.c
> +++ b/drivers/mtd/nand/raw/nand_toshiba.c
> @@ -147,7 +147,7 @@ static void toshiba_nand_decode_id(struct nand_chip *chip)
> static int toshiba_nand_init(struct nand_chip *chip)
> {
> if (nand_is_slc(chip))
> - chip->bbt_options |= NAND_BBT_SCAN2NDPAGE;
> + chip->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
>
> /* Check that chip is BENAND and ECC mode is on-die */
> if (nand_is_slc(chip) && chip->ecc.mode == NAND_ECC_ON_DIE &&
> diff --git a/drivers/mtd/nand/raw/sh_flctl.c b/drivers/mtd/nand/raw/sh_flctl.c
> index cf6b1be1cf9c..971d9afd55e5 100644
> --- a/drivers/mtd/nand/raw/sh_flctl.c
> +++ b/drivers/mtd/nand/raw/sh_flctl.c
> @@ -101,14 +101,12 @@ static const struct mtd_ooblayout_ops flctl_4secc_oob_largepage_ops = {
> static uint8_t scan_ff_pattern[] = { 0xff, 0xff };
>
> static struct nand_bbt_descr flctl_4secc_smallpage = {
> - .options = NAND_BBT_SCAN2NDPAGE,
> .offs = 11,
> .len = 1,
> .pattern = scan_ff_pattern,
> };
>
> static struct nand_bbt_descr flctl_4secc_largepage = {
> - .options = NAND_BBT_SCAN2NDPAGE,
> .offs = 0,
> .len = 2,
> .pattern = scan_ff_pattern,
> @@ -1178,6 +1176,8 @@ static int flctl_probe(struct platform_device *pdev)
> if (pdata->flcmncr_val & SEL_16BIT)
> nand->options |= NAND_BUSWIDTH_16;
>
> + nand->options |= NAND_BBM_FIRSTPAGE | NAND_BBM_SECONDPAGE;
> +
> pm_runtime_enable(&pdev->dev);
> pm_runtime_resume(&pdev->dev);
>
> diff --git a/include/linux/mtd/bbm.h b/include/linux/mtd/bbm.h
> index 3102bd754d18..010bc5544c54 100644
> --- a/include/linux/mtd/bbm.h
> +++ b/include/linux/mtd/bbm.h
> @@ -93,10 +93,7 @@ struct nand_bbt_descr {
> #define NAND_BBT_WRITE 0x00002000
> /* Read and write back block contents when writing bbt */
> #define NAND_BBT_SAVECONTENT 0x00004000
> -/* Search good / bad pattern on the first and the second page */
> -#define NAND_BBT_SCAN2NDPAGE 0x00008000
> -/* Search good / bad pattern on the last page of the eraseblock */
> -#define NAND_BBT_SCANLASTPAGE 0x00010000
> +
> /*
> * Use a flash based bad block table. By default, OOB identifier is saved in
> * OOB area. This option is passed to the default bad block table function.
> @@ -123,13 +120,6 @@ struct nand_bbt_descr {
> /* The maximum number of blocks to scan for a bbt */
> #define NAND_BBT_SCAN_MAXBLOCKS 4
>
> -/*
> - * Constants for oob configuration
> - */
> -#define NAND_SMALL_BADBLOCK_POS 5
> -#define NAND_LARGE_BADBLOCK_POS 0
> -#define ONENAND_BADBLOCK_POS 0
> -
> /*
> * Bad block scanning errors
> */
> @@ -140,7 +130,6 @@ struct nand_bbt_descr {
> /**
> * struct bbm_info - [GENERIC] Bad Block Table data structure
> * @bbt_erase_shift: [INTERN] number of address bits in a bbt entry
> - * @badblockpos: [INTERN] position of the bad block marker in the oob area
> * @options: options for this descriptor
> * @bbt: [INTERN] bad block table pointer
> * @isbad_bbt: function to determine if a block is bad
> @@ -150,7 +139,6 @@ struct nand_bbt_descr {
> */
> struct bbm_info {
> int bbt_erase_shift;
> - int badblockpos;
> int options;
>
> uint8_t *bbt;
> diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
> index 33e240acdc6d..80bd3da06bec 100644
> --- a/include/linux/mtd/rawnand.h
> +++ b/include/linux/mtd/rawnand.h
> @@ -169,6 +169,22 @@ enum nand_ecc_algo {
> /* Macros to identify the above */
> #define NAND_HAS_SUBPAGE_READ(chip) ((chip->options & NAND_SUBPAGE_READ))
>
> +/*
> + * There are different places where the manufacturer stores the factory bad
> + * block markers.
> + *
> + * Position within the block: Each of these pages needs to be checked for a
> + * bad block marking pattern.
> + */
> +#define NAND_BBM_FIRSTPAGE 0x00008000
> +#define NAND_BBM_SECONDPAGE 0x00010000
> +#define NAND_BBM_LASTPAGE 0x00020000
> +
> +/* Position within the OOB data of the page */
> +#define NAND_BBM_POS_SMALL 5
> +#define NAND_BBM_POS_LARGE 0
> +#define NAND_BBM_POS_ONENAND 0
> +
> /* Non chip related options */
> /* This option skips the bbt scan during initialization. */
> #define NAND_SKIP_BBTSCAN 0x00010000
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