From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751353AbdH1Wpx (ORCPT ); Mon, 28 Aug 2017 18:45:53 -0400 Received: from mail.free-electrons.com ([62.4.15.54]:39304 "EHLO mail.free-electrons.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751237AbdH1Wpw (ORCPT ); Mon, 28 Aug 2017 18:45:52 -0400 Date: Tue, 29 Aug 2017 00:45:49 +0200 From: Boris Brezillon To: Andrea Adami Cc: linux-mtd@lists.infradead.org, David Woodhouse , Brian Norris , Marek Vasut , Richard Weinberger , Cyrille Pitchen , =?UTF-8?B?UmFmYcWCIE1pxYJlY2tp?= , Haojian Zhuang , Dmitry Eremin-Solenikov , Robert Jarzmik , linux-kernel@vger.kernel.org Subject: Re: [PATCH v7] mtd: sharpslpart: Add sharpslpart partition parser Message-ID: <20170829004549.3a936874@bbrezillon> In-Reply-To: <1503958832-7525-1-git-send-email-andrea.adami@gmail.com> References: <1503958832-7525-1-git-send-email-andrea.adami@gmail.com> X-Mailer: Claws Mail 3.14.1 (GTK+ 2.24.31; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, 29 Aug 2017 00:20:32 +0200 Andrea Adami wrote: > The Sharp SL Series (Zaurus) PXA handhelds have 16/64/128M of NAND flash > and share the same layout of the first 7M partition, managed by Sharp FTL. > > GPL 2.4 sources: http://support.ezaurus.com/developer/source/source_dl.asp > > The purpose of this self-contained patch is to add a common parser and > remove the hardcoded sizes in the board files (these devices are not yet > converted to devicetree). > Users will have benefits because the mtdparts= tag will not be necessary > anymore and they will be free to repartition the little sized flash. > > The obsolete bootloader can not pass the partitioning info to modern > kernels anymore so it has to be read from flash at known logical addresses. > (see http://www.h5.dion.ne.jp/~rimemoon/zaurus/memo_006.htm ) > > In kernel, under arch/arm/mach-pxa we have already 8 machines: > MACH_POODLE, MACH_CORGI, MACH_SHEPERD, MACH_HUSKY, MACH_AKITA, MACH_SPITZ, > MACH_BORZOI, MACH_TOSA. > Lost after the 2.4 vendor kernel are MACH_BOXER and MACH_TERRIER. > > Almost every model has different factory partitioning: add to this the > units can be repartitioned by users with userspace tools (nandlogical) > and installers for popular (back then) linux distributions. > > The Parameter Area in the first (boot) partition extends from 0x00040000 to > 0x0007bfff (176k) and contains two copies of the partition table: > ... > 0x00060000: Partition Info1 16k > 0x00064000: Partition Info2 16k > 0x00668000: Model 16k > ... > > The first 7M partition is managed by the Sharp FTL reserving 5% + 1 blocks > for wear-leveling: some blocks are remapped and one layer of translation > (logical to physical) is necessary. > > There isn't much documentation about this FTL in the 2.4 sources, just the > MTD methods for reading and writing using logical addresses and the block > management (wear-leveling, use counter). > It seems this FTL was tailored with 16KiB eraesize in mind so to fit one > param block exactly, to have two copies of the partition table on two > blocks. > Later pxa27x devices have same size but 128KiB erasesize and less blocks > (56 vs. 448) but the same schema was adopted, even if the two tables are > now in the same eraseblock. > > For the purpose of the MTD parser only the read part of the code was taken. > > The NAND drivers that can use this parser are sharpsl.c and tmio_nand.c. > A few nitpicks below. Once fixed you can add Reviewed-by: Boris Brezillon > Changelog: > v1 firt version, initial import of 2.4 sources > v2 refactor applying many suggested fixes > v3 put the partition parser types in the platform data > v4 refactor after ML review > v5 fix commit messages and texts, remove global, fixes after v4 review > v6 refactor memory mgmt passing pointer to the FTL, fixes after v5 review > v7 verify the oob are free for the FTL, renamings, fixes after v6 review The changelog should not be part of the commit message... > > Signed-off-by: Andrea Adami > --- ... it should be go here (after the --- separator) so that when we apply the patch it goes away. > drivers/mtd/parsers/Kconfig | 8 + > drivers/mtd/parsers/Makefile | 1 + > drivers/mtd/parsers/sharpslpart.c | 399 ++++++++++++++++++++++++++++++++++++++ > 3 files changed, 408 insertions(+) > create mode 100644 drivers/mtd/parsers/sharpslpart.c > > diff --git a/drivers/mtd/parsers/Kconfig b/drivers/mtd/parsers/Kconfig > index d206b3c..ee5ab99 100644 > --- a/drivers/mtd/parsers/Kconfig > +++ b/drivers/mtd/parsers/Kconfig > @@ -6,3 +6,11 @@ config MTD_PARSER_TRX > may contain up to 3/4 partitions (depending on the version). > This driver will parse TRX header and report at least two partitions: > kernel and rootfs. > + > +config MTD_SHARPSL_PARTS > + tristate "Sharp SL Series NAND flash partition parser" > + depends on MTD_NAND_SHARPSL || MTD_NAND_TMIO || COMPILE_TEST > + help > + This provides the read-only FTL logic necessary to read the partition > + table from the NAND flash of Sharp SL Series (Zaurus) and the MTD > + partition parser using this code. > diff --git a/drivers/mtd/parsers/Makefile b/drivers/mtd/parsers/Makefile > index 4d9024e..5b1bcc3 100644 > --- a/drivers/mtd/parsers/Makefile > +++ b/drivers/mtd/parsers/Makefile > @@ -1 +1,2 @@ > obj-$(CONFIG_MTD_PARSER_TRX) += parser_trx.o > +obj-$(CONFIG_MTD_SHARPSL_PARTS) += sharpslpart.o > diff --git a/drivers/mtd/parsers/sharpslpart.c b/drivers/mtd/parsers/sharpslpart.c > new file mode 100644 > index 0000000..5fddeba > --- /dev/null > +++ b/drivers/mtd/parsers/sharpslpart.c > @@ -0,0 +1,399 @@ > +/* > + * sharpslpart.c - MTD partition parser for NAND flash using the SHARP FTL > + * for logical addressing, as used on the PXA models of the SHARP SL Series. > + * > + * Copyright (C) 2017 Andrea Adami > + * > + * Based on SHARP GPL 2.4 sources: > + * http://support.ezaurus.com/developer/source/source_dl.asp > + * drivers/mtd/nand/sharp_sl_logical.c > + * linux/include/asm-arm/sharp_nand_logical.h > + * > + * Copyright (C) 2002 SHARP > + * > + * This program is free software; you can redistribute it and/or modify > + * it under the terms of the GNU General Public License as published by > + * the Free Software Foundation; either version 2 of the License, or > + * (at your option) any later version. > + * > + * This program is distributed in the hope that it will be useful, > + * but WITHOUT ANY WARRANTY; without even the implied warranty of > + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the > + * GNU General Public License for more details. > + * > + */ > + > +#include > +#include > +#include > +#include > +#include > +#include > +#include > + > +/* oob structure */ > +#define NAND_NOOB_LOGADDR_00 8 > +#define NAND_NOOB_LOGADDR_01 9 > +#define NAND_NOOB_LOGADDR_10 10 > +#define NAND_NOOB_LOGADDR_11 11 > +#define NAND_NOOB_LOGADDR_20 12 > +#define NAND_NOOB_LOGADDR_21 13 > + > +#define BLOCK_IS_RESERVED 0xffff > +#define BLOCK_UNMASK_COMPLEMENT 1 > + > +/* factory defaults */ > +#define SHARPSL_NAND_PARTS 3 > +#define SHARPSL_FTL_PART_SIZE (7 * SZ_1M) > +#define SHARPSL_PARTINFO1_LADDR 0x00060000 > +#define SHARPSL_PARTINFO2_LADDR 0x00064000 > + > +#define BOOT_MAGIC 0x424f4f54 > +#define FSRO_MAGIC 0x4653524f > +#define FSRW_MAGIC 0x46535257 > + > +/** > + * struct sharpsl_ftl - Sharp FTL Logical Table > + * @logmax: number of logical blocks > + * @log2phy: the logical-to-physical table > + * > + * Structure containing the logical-to-physical translation table > + * used by the SHARP SL FTL. > + */ > +struct sharpsl_ftl { > + unsigned int logmax; > + unsigned int *log2phy; > +}; > + > +static int sharpsl_nand_check_ooblayout(struct mtd_info *mtd) > +{ > + u8 freebytes = 0; > + int section = 0; > + > + while (true) { > + struct mtd_oob_region oobfree = { }; > + int ret, i; > + > + ret = mtd_ooblayout_free(mtd, section++, &oobfree); > + if (ret) > + break; > + > + if (!oobfree.length || oobfree.offset > 15 || > + (oobfree.offset + oobfree.length) < 8) > + continue; > + > + i = oobfree.offset >= 8 ? oobfree.offset : 8; > + for (; i < oobfree.offset + oobfree.length && i < 16; i++) > + freebytes |= BIT(i - 8); > + > + if (freebytes == 0xff) > + return 0; I think this function deserves a comment explaining what you're doing: checking that bytes 8 to 15 of the OOB area are free. > + } > + > + return -ENOTSUPP; > +} > + > +static int sharpsl_nand_read_oob(struct mtd_info *mtd, loff_t offs, > + uint8_t *buf) u8 *buf > +{ > + struct mtd_oob_ops ops = { }; > + int ret; > + > + ops.mode = MTD_OPS_PLACE_OOB; > + ops.ooblen = mtd->oobsize; > + ops.oobbuf = buf; > + > + ret = mtd_read_oob(mtd, offs, &ops); > + if (ret != 0 || mtd->oobsize != ops.oobretlen) > + return -1; > + > + return 0; > +} > + > +/* > + * The logical block number assigned to a physical block is stored in the OOB > + * of the first page, in 3 16-bit copies with the following layout: > + * > + * 01234567 89abcdef > + * -------- -------- > + * ECC BB xyxyxy > + * > + * When reading we check that the first two copies agree. > + * In case of error, matching is tried using the following pairs. > + * Reserved values 0xffff mean the block is kept for wear leveling. > + * > + * 01234567 89abcdef > + * -------- -------- > + * ECC BB xyxy oob[8]==oob[10] && oob[9]==oob[11] -> byte0=8 byte1=9 > + * ECC BB xyxy oob[10]==oob[12] && oob[11]==oob[13] -> byte0=10 byte1=11 > + * ECC BB xy xy oob[12]==oob[8] && oob[13]==oob[9] -> byte0=12 byte1=13 > + * There's still an extra/unneeded blank line here. > + */ > +static int sharpsl_nand_get_logical_num(u8 *oob) > +{ > + u16 us; > + int good0, good1; > + > + if (oob[NAND_NOOB_LOGADDR_00] == oob[NAND_NOOB_LOGADDR_10] && > + oob[NAND_NOOB_LOGADDR_01] == oob[NAND_NOOB_LOGADDR_11]) { > + good0 = NAND_NOOB_LOGADDR_00; > + good1 = NAND_NOOB_LOGADDR_01; > + } else if (oob[NAND_NOOB_LOGADDR_10] == oob[NAND_NOOB_LOGADDR_20] && > + oob[NAND_NOOB_LOGADDR_11] == oob[NAND_NOOB_LOGADDR_21]) { > + good0 = NAND_NOOB_LOGADDR_10; > + good1 = NAND_NOOB_LOGADDR_11; > + } else if (oob[NAND_NOOB_LOGADDR_20] == oob[NAND_NOOB_LOGADDR_00] && > + oob[NAND_NOOB_LOGADDR_21] == oob[NAND_NOOB_LOGADDR_01]) { > + good0 = NAND_NOOB_LOGADDR_20; > + good1 = NAND_NOOB_LOGADDR_21; > + } else { > + return -EINVAL; > + } > + > + us = oob[good0] | oob[good1] << 8; > + > + /* parity check */ > + if (hweight16(us) & BLOCK_UNMASK_COMPLEMENT) > + return -EINVAL; > + > + /* reserved */ > + if (us == BLOCK_IS_RESERVED) > + return BLOCK_IS_RESERVED; > + > + return (us >> 1) & GENMASK(9, 0); > +} > + > +static int sharpsl_nand_init_ftl(struct mtd_info *mtd, struct sharpsl_ftl *ftl) > +{ > + unsigned int block_num, log_num, phymax; > + loff_t block_adr; > + u8 *oob; > + int i, ret; > + > + oob = kzalloc(mtd->oobsize, GFP_KERNEL); > + if (!oob) > + return -ENOMEM; > + > + phymax = mtd_div_by_eb(SHARPSL_FTL_PART_SIZE, mtd); > + > + /* FTL reserves 5% of the blocks + 1 spare */ > + ftl->logmax = ((phymax * 95) / 100) - 1; > + > + ftl->log2phy = kmalloc_array(ftl->logmax, sizeof(*ftl->log2phy), > + GFP_KERNEL); > + if (!ftl->log2phy) { > + ret = -ENOMEM; > + goto exit; > + } > + > + /* initialize ftl->log2phy */ > + for (i = 0; i < ftl->logmax; i++) > + ftl->log2phy[i] = UINT_MAX; > + > + /* create physical-logical table */ > + for (block_num = 0; block_num < phymax; block_num++) { > + block_adr = block_num * mtd->erasesize; > + > + if (mtd_block_isbad(mtd, block_adr)) > + continue; > + > + if (sharpsl_nand_read_oob(mtd, block_adr, oob)) > + continue; > + > + /* get logical block */ > + log_num = sharpsl_nand_get_logical_num(oob); > + > + /* cut-off errors and skip the out-of-range values */ > + if (log_num > 0 && log_num < ftl->logmax) { > + if (ftl->log2phy[log_num] == UINT_MAX) > + ftl->log2phy[log_num] = block_num; > + } > + } > + > + pr_info("Sharp SL FTL: %d blocks used (%d logical, %d reserved)\n", > + phymax, ftl->logmax, phymax - ftl->logmax); > + > + ret = 0; > +exit: > + kfree(oob); > + return ret; > +} > + > +void sharpsl_nand_cleanup_ftl(struct sharpsl_ftl *ftl) > +{ > + kfree(ftl->log2phy); > +} > + > +static int sharpsl_nand_read_laddr(struct mtd_info *mtd, > + loff_t from, > + size_t len, > + void *buf, > + struct sharpsl_ftl *ftl) > +{ > + unsigned int log_num, final_log_num; > + unsigned int block_num; > + loff_t block_adr; > + loff_t block_ofs; > + size_t retlen; > + int err; > + > + log_num = mtd_div_by_eb((u32)from, mtd); > + final_log_num = mtd_div_by_eb(((u32)from + len - 1), mtd); > + > + if (len <= 0 || log_num >= ftl->logmax || final_log_num > log_num) > + return -EINVAL; > + > + block_num = ftl->log2phy[log_num]; > + block_adr = block_num * mtd->erasesize; > + block_ofs = mtd_mod_by_eb((u32)from, mtd); > + > + err = mtd_read(mtd, block_adr + block_ofs, len, &retlen, buf); > + /* Ignore corrected ECC errors */ > + if (mtd_is_bitflip(err)) > + err = 0; > + > + if (!err && retlen != len) > + err = -EIO; > + > + if (err) > + pr_err("sharpslpart: error, read failed at %#llx\n", > + block_adr + block_ofs); > + > + return err; > +} > + > +/* > + * MTD Partition Parser > + * > + * Sample values read from SL-C860 > + * > + * # cat /proc/mtd > + * dev: size erasesize name > + * mtd0: 006d0000 00020000 "Filesystem" > + * mtd1: 00700000 00004000 "smf" > + * mtd2: 03500000 00004000 "root" > + * mtd3: 04400000 00004000 "home" > + * > + * PARTITIONINFO1 > + * 0x00060000: 00 00 00 00 00 00 70 00 42 4f 4f 54 00 00 00 00 ......p.BOOT.... > + * 0x00060010: 00 00 70 00 00 00 c0 03 46 53 52 4f 00 00 00 00 ..p.....FSRO.... > + * 0x00060020: 00 00 c0 03 00 00 00 04 46 53 52 57 00 00 00 00 ........FSRW.... > + * Ditto: remove the empty comment line from this comment. > + */ > +struct sharpsl_nand_partinfo { > + __le32 start; > + __le32 end; > + __be32 magic; > + u32 reserved; > +}; > + > +static int sharpsl_nand_read_partinfo(struct mtd_info *master, > + loff_t from, > + size_t len, > + struct sharpsl_nand_partinfo *buf, > + struct sharpsl_ftl *ftl) > +{ > + int ret; > + > + ret = sharpsl_nand_read_laddr(master, from, len, buf, ftl); > + if (ret) > + return ret; > + > + /* check for magics */ > + if (be32_to_cpu(buf[0].magic) != BOOT_MAGIC || > + be32_to_cpu(buf[1].magic) != FSRO_MAGIC || > + be32_to_cpu(buf[2].magic) != FSRW_MAGIC) { > + pr_err("sharpslpart: magic values mismatch\n"); > + return -EINVAL; > + } > + > + /* fixup for hardcoded value 64 MiB (for older models) */ > + buf[2].end = cpu_to_le32(master->size); > + > + /* extra sanity check */ > + if (le32_to_cpu(buf[0].end) <= le32_to_cpu(buf[0].start) || > + le32_to_cpu(buf[1].start) < le32_to_cpu(buf[0].end) || > + le32_to_cpu(buf[1].end) <= le32_to_cpu(buf[1].start) || > + le32_to_cpu(buf[2].start) < le32_to_cpu(buf[1].end) || > + le32_to_cpu(buf[2].end) <= le32_to_cpu(buf[2].start)) { > + pr_err("sharpslpart: partition sizes mismatch\n"); > + return -EINVAL; > + } > + > + return 0; > +} > + > +static int sharpsl_parse_mtd_partitions(struct mtd_info *master, > + const struct mtd_partition **pparts, > + struct mtd_part_parser_data *data) > +{ > + struct sharpsl_ftl ftl; > + struct sharpsl_nand_partinfo buf[SHARPSL_NAND_PARTS]; > + struct mtd_partition *sharpsl_nand_parts; > + int err; > + > + /* check that OOB bytes 8 to 15 used by the FTL are actually free */ > + err = sharpsl_nand_check_ooblayout(master); > + if (err) > + return err; > + > + /* init logical mgmt (FTL) */ > + err = sharpsl_nand_init_ftl(master, &ftl); > + if (err) > + return err; > + > + /* read and validate first partition table */ > + pr_info("sharpslpart: try reading first partition table\n"); > + err = sharpsl_nand_read_partinfo(master, > + SHARPSL_PARTINFO1_LADDR, > + sizeof(buf), buf, &ftl); > + if (err) { > + /* fallback: read second partition table */ > + pr_warn("sharpslpart: first partition table is invalid, retry using the second\n"); > + err = sharpsl_nand_read_partinfo(master, > + SHARPSL_PARTINFO2_LADDR, > + sizeof(buf), buf, &ftl); > + } > + > + /* cleanup logical mgmt (FTL) */ > + sharpsl_nand_cleanup_ftl(&ftl); > + > + if (err) { > + pr_err("sharpslpart: both partition tables are invalid\n"); > + return err; > + } > + > + sharpsl_nand_parts = kzalloc(sizeof(*sharpsl_nand_parts) * > + SHARPSL_NAND_PARTS, GFP_KERNEL); > + if (!sharpsl_nand_parts) > + return -ENOMEM; > + > + /* original names */ > + sharpsl_nand_parts[0].name = "smf"; > + sharpsl_nand_parts[0].offset = le32_to_cpu(buf[0].start); > + sharpsl_nand_parts[0].size = le32_to_cpu(buf[0].end) - > + le32_to_cpu(buf[0].start); > + > + sharpsl_nand_parts[1].name = "root"; > + sharpsl_nand_parts[1].offset = le32_to_cpu(buf[1].start); > + sharpsl_nand_parts[1].size = le32_to_cpu(buf[1].end) - > + le32_to_cpu(buf[1].start); > + > + sharpsl_nand_parts[2].name = "home"; > + sharpsl_nand_parts[2].offset = le32_to_cpu(buf[2].start); > + sharpsl_nand_parts[2].size = le32_to_cpu(buf[2].end) - > + le32_to_cpu(buf[2].start); > + > + *pparts = sharpsl_nand_parts; > + return SHARPSL_NAND_PARTS; > +} > + > +static struct mtd_part_parser sharpsl_mtd_parser = { > + .parse_fn = sharpsl_parse_mtd_partitions, > + .name = "sharpslpart", > +}; > +module_mtd_part_parser(sharpsl_mtd_parser); > + > +MODULE_LICENSE("GPL"); > +MODULE_AUTHOR("Andrea Adami "); > +MODULE_DESCRIPTION("MTD partitioning for NAND flash on Sharp SL Series");