From: Alexander Dahl <ada@thorsis.com> To: linux-mtd@lists.infradead.org Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Stefan Riedmueller <s.riedmueller@phytec.de>, Vignesh Raghavendra <vigneshr@ti.com>, Richard Weinberger <richard@nod.at>, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>, Fabio Estevam <festevam@gmail.com>, Pengutronix Kernel Team <kernel@pengutronix.de>, Sascha Hauer <s.hauer@pengutronix.de>, Boris Brezillon <boris.brezillon@collabora.com>, Dan Brown <dan_brown@ieee.org>, David Woodhouse <dwmw2@infradead.org>, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mtd: rawnand: nand_bbt: Skip bad blocks when searching for the BBT in NAND Date: Wed, 07 Jul 2021 11:18:53 +0200 [thread overview] Message-ID: <2691583.eailiBHnQg@ada> (raw) In-Reply-To: <20210706181308.1aa21d00@xps13> Hei hei, Am Dienstag, 6. Juli 2021, 18:13:08 CEST schrieb Miquel Raynal: > Hi Stefan, > > Stefan Riedmueller <s.riedmueller@phytec.de> wrote on Fri, 25 Jun 2021 > > 14:38:21 +0200: > > The blocks containing the bad block table can become bad as well. So > > make sure to skip any blocks that are marked bad when searching for the > > bad block table. > > > > Otherwise in very rare cases where two BBT blocks wear out it might > > happen that an obsolete BBT is used instead of a newer available > > version. > > > > This only applies to drivers which make use of a bad block marker in > > flash. > > Other drivers won't be able to identify bad BBT blocks and thus can't skip > > these. > > > > Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de> > > Besides the alignment of the helper parameters (nitpick) the patch > looks good to me. If we can get someone to test it before the merge > window closes it's perfect. Otherwise I'll apply it and we'll let robots > do the job. Added the patch on top of v5.10.21 and booted a SAMA5D27 based board, from the boot log: nand: device found, Manufacturer ID: 0x01, Chip ID: 0xda nand: AMD/Spansion S34ML02G1 nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 Bad block table found at page 131008, version 0xFF Bad block table found at page 130944, version 0xFF 6 cmdlinepart partitions found on MTD device atmel_nand Creating 6 MTD partitions on "atmel_nand": 0x000000000000-0x000000040000 : "bootstrap" 0x000000040000-0x000000100000 : "uboot" 0x000000100000-0x000000140000 : "env1" 0x000000140000-0x000000180000 : "env2" 0x000000180000-0x000000200000 : "reserved" 0x000000200000-0x000010000000 : "UBI" NET: Registered protocol family 17 ubi0: attaching mtd5 random: fast init done ubi0: scanning is finished ubi0: attached mtd5 (name "UBI", size 254 MiB) ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048 ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096 ubi0: good PEBs: 2028, bad PEBs: 4, corrupted PEBs: 0 ubi0: user volume: 4, internal volumes: 1, max. volumes count: 128 ubi0: max/mean erase counter: 4/1, WL threshold: 4096, image sequence number: 1600812189 ubi0: available PEBs: 0, total reserved PEBs: 2028, PEBs reserved for bad PEB handling: 36 ubi0: background thread "ubi_bgt0d" started, PID 85 No suspicious other messages. Not sure if that device would be affected anyways. No bad blocks are known on this flash, device behaves as usual. HTH & Greets Alex > > > --- > > > > Hi, > > > > this is the second approach of this patch. The first one [1] unfortunately > > lead to boot failures on i.MX 27 boards [2] since the i.MX 27 driver uses > > the bad block marker position for the bad block table marker which lead > > to falsely identifying all BBT blocks as bad. > > > > This new patch now skips the check for bad BBT blocks if the BBT marker > > position in OOB overlaps with the bad block marker position or if a driver > > can't use bad block markers in flash at all (NAND_BBT_NO_OOB_BBM or > > NAND_NO_BBM_QUIRK are set). This hopefully makes sure we don't break > > drivers which cannot check for bad BBT blocks due to the limitations > > mentioned before. > > > > I was only able to test this patch on a phyCORE-i.MX 6 and a phyCARD-i.MX > > 27. Therfore would really appreciate more people testing this to make > > sure I have not missed another use case where the bad block marker > > position in OOB is used in a different way than for the BBM. > > > > Regards, > > Stefan > > > > [1] > > https://lore.kernel.org/linux-mtd/20210325102337.481172-1-s.riedmueller@p > > hytec.de/ [2] > > https://lore.kernel.org/linux-mtd/CAOMZO5DufVR=+EzCa1-MPUc+ZefZVTXb5Kgu3W > > xms7cxw9GmGg@mail.gmail.com/> > > drivers/mtd/nand/raw/nand_bbt.c | 34 +++++++++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/drivers/mtd/nand/raw/nand_bbt.c > > b/drivers/mtd/nand/raw/nand_bbt.c index dced32a126d9..2a30714350ee 100644 > > --- a/drivers/mtd/nand/raw/nand_bbt.c > > +++ b/drivers/mtd/nand/raw/nand_bbt.c > > @@ -447,6 +447,36 @@ static int scan_block_fast(struct nand_chip *this, > > struct nand_bbt_descr *bd,> > > return 0; > > > > } > > > > +/* Check if a potential BBT block is marked as bad */ > > +static int bbt_block_checkbad(struct nand_chip *this, > > + struct nand_bbt_descr *td, > > + loff_t offs, uint8_t *buf) > > +{ > > + struct nand_bbt_descr *bd = this->badblock_pattern; > > + > > + /* > > + * No need to check for a bad BBT block if the BBM area overlaps with > > + * the bad block table marker area in OOB since writing a BBM here > > + * invalidates the bad block table marker anyway. > > + */ > > + if (!(td->options & NAND_BBT_NO_OOB) && > > + td->offs >= bd->offs && td->offs < bd->offs + bd->len) > > + return 0; > > + > > + /* > > + * There is no point in checking for a bad block marker if writing > > + * such marker is not supported > > + */ > > + if (this->bbt_options & NAND_BBT_NO_OOB_BBM || > > + this->options & NAND_NO_BBM_QUIRK) > > + return 0; > > + > > + if (scan_block_fast(this, bd, offs, buf) > 0) > > + return 1; > > + > > + return 0; > > +} > > + > > > > /** > > > > * create_bbt - [GENERIC] Create a bad block table by scanning the device > > * @this: NAND chip object > > > > @@ -560,6 +590,10 @@ static int search_bbt(struct nand_chip *this, uint8_t > > *buf,> > > int actblock = startblock + dir * block; > > loff_t offs = (loff_t)actblock << this->bbt_erase_shift; > > > > + /* Check if block is marked bad */ > > + if (bbt_block_checkbad(this, td, offs, buf)) > > + continue; > > + > > > > /* Read first page */ > > scan_read(this, buf, offs, mtd->writesize, td); > > if (!check_pattern(buf, scanlen, mtd->writesize, td)) { > > Thanks, > Miquèl > > ______________________________________________________ > Linux MTD discussion mailing list > http://lists.infradead.org/mailman/listinfo/linux-mtd/
WARNING: multiple messages have this Message-ID (diff)
From: Alexander Dahl <ada@thorsis.com> To: linux-mtd@lists.infradead.org Cc: Miquel Raynal <miquel.raynal@bootlin.com>, Stefan Riedmueller <s.riedmueller@phytec.de>, Vignesh Raghavendra <vigneshr@ti.com>, Richard Weinberger <richard@nod.at>, Mauro Carvalho Chehab <mchehab+huawei@kernel.org>, Kieran Bingham <kieran.bingham+renesas@ideasonboard.com>, Fabio Estevam <festevam@gmail.com>, Pengutronix Kernel Team <kernel@pengutronix.de>, Sascha Hauer <s.hauer@pengutronix.de>, Boris Brezillon <boris.brezillon@collabora.com>, Dan Brown <dan_brown@ieee.org>, David Woodhouse <dwmw2@infradead.org>, linux-kernel@vger.kernel.org Subject: Re: [PATCH] mtd: rawnand: nand_bbt: Skip bad blocks when searching for the BBT in NAND Date: Wed, 07 Jul 2021 11:18:53 +0200 [thread overview] Message-ID: <2691583.eailiBHnQg@ada> (raw) In-Reply-To: <20210706181308.1aa21d00@xps13> Hei hei, Am Dienstag, 6. Juli 2021, 18:13:08 CEST schrieb Miquel Raynal: > Hi Stefan, > > Stefan Riedmueller <s.riedmueller@phytec.de> wrote on Fri, 25 Jun 2021 > > 14:38:21 +0200: > > The blocks containing the bad block table can become bad as well. So > > make sure to skip any blocks that are marked bad when searching for the > > bad block table. > > > > Otherwise in very rare cases where two BBT blocks wear out it might > > happen that an obsolete BBT is used instead of a newer available > > version. > > > > This only applies to drivers which make use of a bad block marker in > > flash. > > Other drivers won't be able to identify bad BBT blocks and thus can't skip > > these. > > > > Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de> > > Besides the alignment of the helper parameters (nitpick) the patch > looks good to me. If we can get someone to test it before the merge > window closes it's perfect. Otherwise I'll apply it and we'll let robots > do the job. Added the patch on top of v5.10.21 and booted a SAMA5D27 based board, from the boot log: nand: device found, Manufacturer ID: 0x01, Chip ID: 0xda nand: AMD/Spansion S34ML02G1 nand: 256 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 Bad block table found at page 131008, version 0xFF Bad block table found at page 130944, version 0xFF 6 cmdlinepart partitions found on MTD device atmel_nand Creating 6 MTD partitions on "atmel_nand": 0x000000000000-0x000000040000 : "bootstrap" 0x000000040000-0x000000100000 : "uboot" 0x000000100000-0x000000140000 : "env1" 0x000000140000-0x000000180000 : "env2" 0x000000180000-0x000000200000 : "reserved" 0x000000200000-0x000010000000 : "UBI" NET: Registered protocol family 17 ubi0: attaching mtd5 random: fast init done ubi0: scanning is finished ubi0: attached mtd5 (name "UBI", size 254 MiB) ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 2048 ubi0: VID header offset: 2048 (aligned 2048), data offset: 4096 ubi0: good PEBs: 2028, bad PEBs: 4, corrupted PEBs: 0 ubi0: user volume: 4, internal volumes: 1, max. volumes count: 128 ubi0: max/mean erase counter: 4/1, WL threshold: 4096, image sequence number: 1600812189 ubi0: available PEBs: 0, total reserved PEBs: 2028, PEBs reserved for bad PEB handling: 36 ubi0: background thread "ubi_bgt0d" started, PID 85 No suspicious other messages. Not sure if that device would be affected anyways. No bad blocks are known on this flash, device behaves as usual. HTH & Greets Alex > > > --- > > > > Hi, > > > > this is the second approach of this patch. The first one [1] unfortunately > > lead to boot failures on i.MX 27 boards [2] since the i.MX 27 driver uses > > the bad block marker position for the bad block table marker which lead > > to falsely identifying all BBT blocks as bad. > > > > This new patch now skips the check for bad BBT blocks if the BBT marker > > position in OOB overlaps with the bad block marker position or if a driver > > can't use bad block markers in flash at all (NAND_BBT_NO_OOB_BBM or > > NAND_NO_BBM_QUIRK are set). This hopefully makes sure we don't break > > drivers which cannot check for bad BBT blocks due to the limitations > > mentioned before. > > > > I was only able to test this patch on a phyCORE-i.MX 6 and a phyCARD-i.MX > > 27. Therfore would really appreciate more people testing this to make > > sure I have not missed another use case where the bad block marker > > position in OOB is used in a different way than for the BBM. > > > > Regards, > > Stefan > > > > [1] > > https://lore.kernel.org/linux-mtd/20210325102337.481172-1-s.riedmueller@p > > hytec.de/ [2] > > https://lore.kernel.org/linux-mtd/CAOMZO5DufVR=+EzCa1-MPUc+ZefZVTXb5Kgu3W > > xms7cxw9GmGg@mail.gmail.com/> > > drivers/mtd/nand/raw/nand_bbt.c | 34 +++++++++++++++++++++++++++++++++ > > 1 file changed, 34 insertions(+) > > > > diff --git a/drivers/mtd/nand/raw/nand_bbt.c > > b/drivers/mtd/nand/raw/nand_bbt.c index dced32a126d9..2a30714350ee 100644 > > --- a/drivers/mtd/nand/raw/nand_bbt.c > > +++ b/drivers/mtd/nand/raw/nand_bbt.c > > @@ -447,6 +447,36 @@ static int scan_block_fast(struct nand_chip *this, > > struct nand_bbt_descr *bd,> > > return 0; > > > > } > > > > +/* Check if a potential BBT block is marked as bad */ > > +static int bbt_block_checkbad(struct nand_chip *this, > > + struct nand_bbt_descr *td, > > + loff_t offs, uint8_t *buf) > > +{ > > + struct nand_bbt_descr *bd = this->badblock_pattern; > > + > > + /* > > + * No need to check for a bad BBT block if the BBM area overlaps with > > + * the bad block table marker area in OOB since writing a BBM here > > + * invalidates the bad block table marker anyway. > > + */ > > + if (!(td->options & NAND_BBT_NO_OOB) && > > + td->offs >= bd->offs && td->offs < bd->offs + bd->len) > > + return 0; > > + > > + /* > > + * There is no point in checking for a bad block marker if writing > > + * such marker is not supported > > + */ > > + if (this->bbt_options & NAND_BBT_NO_OOB_BBM || > > + this->options & NAND_NO_BBM_QUIRK) > > + return 0; > > + > > + if (scan_block_fast(this, bd, offs, buf) > 0) > > + return 1; > > + > > + return 0; > > +} > > + > > > > /** > > > > * create_bbt - [GENERIC] Create a bad block table by scanning the device > > * @this: NAND chip object > > > > @@ -560,6 +590,10 @@ static int search_bbt(struct nand_chip *this, uint8_t > > *buf,> > > int actblock = startblock + dir * block; > > loff_t offs = (loff_t)actblock << this->bbt_erase_shift; > > > > + /* Check if block is marked bad */ > > + if (bbt_block_checkbad(this, td, offs, buf)) > > + continue; > > + > > > > /* Read first page */ > > scan_read(this, buf, offs, mtd->writesize, td); > > if (!check_pattern(buf, scanlen, mtd->writesize, td)) { > > Thanks, > Miquèl > > ______________________________________________________ > Linux MTD discussion mailing list > http://lists.infradead.org/mailman/listinfo/linux-mtd/ ______________________________________________________ Linux MTD discussion mailing list http://lists.infradead.org/mailman/listinfo/linux-mtd/
next prev parent reply other threads:[~2021-07-07 9:19 UTC|newest] Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top 2021-06-25 12:38 [PATCH] mtd: rawnand: nand_bbt: Skip bad blocks when searching for the BBT in NAND Stefan Riedmueller 2021-06-25 12:38 ` Stefan Riedmueller 2021-07-06 16:13 ` Miquel Raynal 2021-07-06 16:13 ` Miquel Raynal 2021-07-07 8:22 ` [PATCH] fixup! " Stefan Riedmueller 2021-07-07 8:22 ` Stefan Riedmueller 2021-07-07 9:18 ` Alexander Dahl [this message] 2021-07-07 9:18 ` [PATCH] " Alexander Dahl 2021-07-08 8:42 ` Stefan Riedmüller 2021-07-08 8:42 ` Stefan Riedmüller 2021-07-15 23:08 ` Miquel Raynal 2021-07-15 23:08 ` Miquel Raynal -- strict thread matches above, loose matches on Subject: below -- 2021-03-25 10:23 Stefan Riedmueller 2021-03-25 10:23 ` Stefan Riedmueller 2021-03-28 17:35 ` Miquel Raynal 2021-03-28 17:35 ` Miquel Raynal
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