From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2992704AbXBQRD1 (ORCPT ); Sat, 17 Feb 2007 12:03:27 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S2992707AbXBQRDU (ORCPT ); Sat, 17 Feb 2007 12:03:20 -0500 Received: from smtp.nokia.com ([131.228.20.170]:53062 "EHLO mgw-ext11.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2992596AbXBQRBb (ORCPT ); Sat, 17 Feb 2007 12:01:31 -0500 From: Artem Bityutskiy To: Linux Kernel Mailing List Cc: Christoph Hellwig , Artem Bityutskiy , Frank Haverkamp , Thomas Gleixner , David Woodhouse , Josh Boyer Date: Sat, 17 Feb 2007 18:54:54 +0200 Message-Id: <20070217165454.5845.30875.sendpatchset@localhost.localdomain> In-Reply-To: <20070217165424.5845.4390.sendpatchset@localhost.localdomain> References: <20070217165424.5845.4390.sendpatchset@localhost.localdomain> Subject: [PATCH 06/44 take 2] [UBI] startup code X-OriginalArrivalTime: 17 Feb 2007 16:54:22.0055 (UTC) FILETIME=[45B6D770:01C752B4] X-Nokia-AV: Clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org diff -auNrp tmp-from/drivers/mtd/ubi/init.c tmp-to/drivers/mtd/ubi/init.c --- tmp-from/drivers/mtd/ubi/init.c 1970-01-01 02:00:00.000000000 +0200 +++ tmp-to/drivers/mtd/ubi/init.c 2007-02-17 18:07:26.000000000 +0200 @@ -0,0 +1,371 @@ +/* + * Copyright (c) International Business Machines Corp., 2006 + * + * 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. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + * + * Author: Artem B. Bityutskiy, + * Frank Haverkamp + */ + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "ubi.h" +#include "alloc.h" +#include "uif.h" +#include "io.h" +#include "build.h" +#include "debug.h" + +/* Maximum MTD device specification parameter length */ +#define UBI_MTD_PARAM_LEN_MAX 64 + +/** + * struct mtd_dev_param - MTD device parameter description data structure. + * + * @name: MTD device name or number string + * @vid_hdr_offs: VID header offset + * @data_offs: data offset + */ +struct mtd_dev_param +{ + char name[UBI_MTD_PARAM_LEN_MAX]; + int vid_hdr_offs; + int data_offs; +}; + +/* Numbers of elements set in the @mtd_dev_param array. */ +static int mtd_devs = 0; + +/* MTD devices specification parameters */ +static struct mtd_dev_param mtd_dev_param[UBI_MAX_INSTANCES]; + +/* Number of UBI devices in system */ +int ubis_num; + +/* All the UBI devices in system */ +struct ubi_info *ubis[UBI_MAX_INSTANCES]; + +/* UBI headers must take 64 bytes. The below is a hacky way to ensure this */ +static int __ubi_check_ec_hdr_size[(UBI_EC_HDR_SIZE == 64) - 1] + __attribute__ ((__unused__)); +static int __ubi_check_ec_hdr_size[(UBI_VID_HDR_SIZE == 64) - 1] + __attribute__ ((__unused__)); + +static int ubi_attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset, + int data_offset); +static void ubi_destroy_dev(int ubi_num); + +static int __init ubi_init(void) +{ + int err, i, k; + + if (mtd_devs > UBI_MAX_INSTANCES) { + printk("UBI error: too many MTD devices, max. is %d\n", + UBI_MAX_INSTANCES); + return -EINVAL; + } + + err = ubi_dbg_init(); + if (err) { + printk("UBI error: failed to initialize debugging unit, " + "error %d", err); + return err; + } + + err = ubi_alloc_init(); + if (err) { + dbg_err("failed to initialize memory allocation unit, " + "error %d", err); + goto out_dbg; + } + + /* Initialize the user interface unit */ + err = ubi_uif_global_init(); + if (err) { + dbg_err("failed to initialize user interfaces unit, error %d", + err); + goto out_alloc; + } + + /* Attach MTD devices */ + for (i = 0; i < mtd_devs; i++) { + struct mtd_dev_param *p = &mtd_dev_param[i]; + + cond_resched(); + err = -EINVAL; + + /* First suppose this is MTD device name */ + err = ubi_attach_mtd_dev(p->name, p->vid_hdr_offs, + p->data_offs); + if (err) + goto out_detach; + } + + return 0; + +out_detach: + for (k = 0; k < i; k++) + ubi_destroy_dev(k); + ubi_uif_global_close(); +out_alloc: + ubi_alloc_close(); +out_dbg: + ubi_dbg_close(); + return err; +} +module_init(ubi_init); + +static void __exit ubi_exit(void) +{ + int i; + + for (i = 0; i < ubis_num; i++) + ubi_destroy_dev(i); + ubi_uif_global_close(); + ubi_alloc_close(); + ubi_dbg_close(); +} +module_exit(ubi_exit); + +/** + * ubi_attach_mtd_dev - attach an MTD device. + * + * @mtd_dev: MTD device name or number string to attach + * @vid_hdr_offset: volume identifier header offset in physical eraseblocks + * @data_offset: data offset in physical eraseblock + * + * This function attaches an MTD device to UBI. It first treats @mtd_dev as the + * MTD device name, and tries to open it by this name. If it is unable to open, + * it tries to convert @mtd_dev to an integer and open the MTD device by its + * number. Returns zero in case of success and a negative error code in case of + * failure. + */ +static int ubi_attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset, + int data_offset) +{ + struct mtd_info *mtd; + int i, err, mtd_num, ubi_num; + + if (!mtd_dev) + return -EINVAL; + + if (ubis_num == UBI_MAX_INSTANCES) { + ubi_err("too many UBI devices, max. is %d", UBI_MAX_INSTANCES); + return -EINVAL; + } + + mtd = get_mtd_device_nm(mtd_dev); + if (IS_ERR(mtd)) { + char *endp; + + if (PTR_ERR(mtd) != -ENODEV) + return PTR_ERR(mtd); + + mtd_num = simple_strtoul(mtd_dev, &endp, 0); + if (*endp != '\0' || mtd_dev == endp) { + ubi_err("incorrect MTD device: \"%s\"", mtd_dev); + return -ENODEV; + } + + mtd = get_mtd_device(NULL, mtd_num); + if (IS_ERR(mtd)) + return PTR_ERR(mtd); + } + + mtd_num = mtd->index; + put_mtd_device(mtd); + + /* Check is we already have the same MTD device attached */ + for (i = 0; i < ubis_num; i++) + if (ubis[i]->io->mtd_num == mtd_num) { + ubi_err("mtd%d is already attached to ubi%d", + mtd_num, i); + return -EINVAL; + } + + ubi_num = ubis_num++; + + ubis[ubi_num] = ubi_kzalloc(sizeof(struct ubi_info)); + if (!ubis[ubi_num]) + return -ENOMEM; + + ubis[ubi_num]->ubi_num = ubi_num; + + err = ubi_bld_attach_mtd_dev(ubis[ubi_num], mtd_num, vid_hdr_offset, + data_offset); + if (err) + goto out_free; + + if (ubi_num == ubis_num) + ubis_num += 1; + + return 0; + +out_free: + ubi_kfree(ubis[i]); + return -ENODEV; +} + +/** + * ubi_destroy_dev - destroy an UBI device. + * + * @ubi_num: UBI device number to destroy + * + * In current UBI implementation UBI devices are static and cannot dynamically + * go and come. So this function is only used when UBI is de-initialized. + */ +static void ubi_destroy_dev(int ubi_num) +{ + ubi_bld_detach_mtd_dev(ubis[ubi_num]); + ubi_kfree(ubis[ubi_num]); +} + +static int __init bytes_str_to_int(const char *str); + +/** + * ubi_mtd_param_parse - parse the "mtd" UBI parameter. + * + * @val: the parameter value to parse + * @kp: not used + * + * This function returns zero in case of success and a negative error code in + * case of error. + */ +static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp) +{ + int i, len; + struct mtd_dev_param *p; + char buf[UBI_MTD_PARAM_LEN_MAX]; + char *pbuf = &buf[0]; + char *tokens[3] = {NULL, NULL, NULL}; + + if (mtd_devs == UBI_MAX_INSTANCES) { + printk("UBI error: too many parameters, max. is %d\n", + UBI_MAX_INSTANCES); + return -EINVAL; + } + + len = strnlen(val, UBI_MTD_PARAM_LEN_MAX); + if (len > UBI_MTD_PARAM_LEN_MAX) { + printk("UBI error: parameter \"%s\" is too long, max. is %d\n", + val, UBI_MTD_PARAM_LEN_MAX); + return -EINVAL; + } + + if (len == 0) { + printk("UBI warning: empty \"mtd\" parameter - ignored\n"); + return 0; + } + + strcpy(buf, val); + + /* Get rid of the final newline */ + if (buf[len - 1] == '\n') + buf[len - 1] = 0; + + for (i = 0; i < 3; i++) + tokens[i] = strsep(&pbuf, ","); + + if (pbuf) { + printk("UBI error: too many arguments at \"%s\"\n", val); + return -EINVAL; + } + + if (tokens[0] == '\0') + return -EINVAL; + + p = &mtd_dev_param[mtd_devs]; + strcpy(&p->name[0], tokens[0]); + + if (tokens[1]) + p->vid_hdr_offs = bytes_str_to_int(tokens[1]); + if (tokens[2]) + p->data_offs = bytes_str_to_int(tokens[2]); + + if (p->vid_hdr_offs < 0) + return p->vid_hdr_offs; + if (p->data_offs < 0) + return p->data_offs; + + mtd_devs += 1; + + return 0; +} + +/* + * bytes_str_to_int - convert a string representing a number of bytes to an + * integer. + * + * @str: the string to convert + * + * This function returns positive resulting integer in case of success and a + * negative error code in case of failure. + */ +static int __init bytes_str_to_int(const char *str) +{ + char *endp; + unsigned long result; + + result = simple_strtoul(str, &endp, 0); + if (str == endp || result < 0) { + printk("UBI error: incorrect bytes count: \"%s\"\n", str); + return -EINVAL; + } + + switch (*endp) { + case 'G': + result *= 1024; + case 'M': + result *= 1024; + case 'K': + case 'k': + result *= 1024; + if (endp[1] == 'i' && (endp[2] == '\0' || + endp[2] == 'B' || endp[2] == 'b')) + endp += 2; + case '\0': + break; + default: + printk("UBI error: incorrect bytes count: \"%s\"\n", str); + return -EINVAL; + } + + return result; +} + +module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000); +MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: " + "mtd=[,,]. " + "Multiple \"mtd\" parameters may be specified.\n" + "MTD devices may be specified by their number or name. " + "Optional \"vid_hdr_offs\" and \"data_offs\" parameters " + "specify UBI VID header position and data starting " + "position to be used by UBI.\n" + "Example: mtd=content,1984,2048 mtd=4 - attach MTD device" + "with name content using VID header offset 1984 and data " + "start 2048, and MTD device number 4 using default " + "offsets"); + +MODULE_VERSION(__stringify(UBI_VERSION)); +MODULE_DESCRIPTION("UBI - Unsorted Block Images"); +MODULE_AUTHOR("Artem B. Bityutskiy"); +MODULE_LICENSE("GPL");