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Date: Fri, 23 Mar 2007 18:43:22 +0200
From: Artem Bityutskiy <dedekind@...radead.org>
To: Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Cc: Frank Haverkamp <haver@...t.ibm.com>,
David Woodhouse <dwmw2@...radead.org>,
Josh Boyer <jwboyer@...ux.vnet.ibm.com>,
Artem Bityutskiy <dedekind@...radead.org>
Subject: [PATCH 05/20 take 4] UBI: startup code
diff -auNrp tmp-from/drivers/mtd/ubi/build.c tmp-to/drivers/mtd/ubi/build.c
--- tmp-from/drivers/mtd/ubi/build.c 1970-01-01 02:00:00.000000000 +0200
+++ tmp-to/drivers/mtd/ubi/build.c 2007-03-23 18:20:01.000000000 +0200
@@ -0,0 +1,843 @@
+/*
+ * Copyright (c) International Business Machines Corp., 2006
+ * Copyright (c) Nokia Corporation, 2007
+ *
+ * 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 Bityutskiy (Битюцкий Артём),
+ * Frank Haverkamp
+ */
+
+/*
+ * This file includes UBI initialization and building of UBI devices. At the
+ * moment UBI devices may only be added while UBI is initialized, but dynamic
+ * device add/remove functionality is planned. Also, at the moment we only
+ * attach UBI devices by scanning, which will become a bottleneck when flashes
+ * reach certain large size. Then one may improve UBI and add other methods.
+ */
+
+#include <linux/err.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/stringify.h>
+#include <linux/stat.h>
+#include "ubi.h"
+
+/* Maximum length of the 'mtd=' parameter */
+#define 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[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_DEVICES];
+
+/* Number of UBI devices in system */
+int ubi_devices_cnt;
+
+/* All UBI devices in system */
+struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
+
+/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
+struct class *ubi_class;
+
+/* "Show" method for files in '/<sysfs>/class/ubi/' */
+static ssize_t ubi_version_show(struct class *class, char *buf)
+{
+ return sprintf(buf, "%d\n", UBI_VERSION);
+}
+
+/* UBI version attribute ('/<sysfs>/class/ubi/version') */
+static struct class_attribute ubi_version =
+ __ATTR(version, S_IRUGO, ubi_version_show, NULL);
+
+static ssize_t dev_attribute_show(struct device *dev,
+ struct device_attribute *attr, char *buf);
+
+/* UBI device attributes (correspond to files in '/<sysfs>/class/ubi/ubiX') */
+static struct device_attribute dev_eraseblock_size =
+ __ATTR(eraseblock_size, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_avail_eraseblocks =
+ __ATTR(avail_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_total_eraseblocks =
+ __ATTR(total_eraseblocks, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_volumes_count =
+ __ATTR(volumes_count, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_max_ec =
+ __ATTR(max_ec, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_reserved_for_bad =
+ __ATTR(reserved_for_bad, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_bad_peb_count =
+ __ATTR(bad_peb_count, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_max_vol_count =
+ __ATTR(max_vol_count, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_min_io_size =
+ __ATTR(min_io_size, S_IRUGO, dev_attribute_show, NULL);
+static struct device_attribute dev_bgt_enabled =
+ __ATTR(bgt_enabled, S_IRUGO, dev_attribute_show, NULL);
+
+/* "Show" method for files in '/<sysfs>/class/ubi/ubiX/' */
+static ssize_t dev_attribute_show(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ const struct ubi_device *ubi;
+
+ ubi = container_of(dev, struct ubi_device, dev);
+ if (attr == &dev_eraseblock_size)
+ return sprintf(buf, "%d\n", ubi->leb_size);
+ else if (attr == &dev_avail_eraseblocks)
+ return sprintf(buf, "%d\n", ubi->avail_pebs);
+ else if (attr == &dev_total_eraseblocks)
+ return sprintf(buf, "%d\n", ubi->good_peb_count);
+ else if (attr == &dev_volumes_count)
+ return sprintf(buf, "%d\n", ubi->vol_count);
+ else if (attr == &dev_max_ec)
+ return sprintf(buf, "%d\n", ubi->max_ec);
+ else if (attr == &dev_reserved_for_bad)
+ return sprintf(buf, "%d\n", ubi->beb_rsvd_pebs);
+ else if (attr == &dev_bad_peb_count)
+ return sprintf(buf, "%d\n", ubi->bad_peb_count);
+ else if (attr == &dev_max_vol_count)
+ return sprintf(buf, "%d\n", ubi->vtbl_slots);
+ else if (attr == &dev_min_io_size)
+ return sprintf(buf, "%d\n", ubi->min_io_size);
+ else if (attr == &dev_bgt_enabled)
+ return sprintf(buf, "%d\n", ubi->thread_enabled);
+ else
+ BUG();
+
+ return 0;
+}
+
+/* Fake "release" method for UBI devices */
+static void dev_release(struct device *dev) { }
+
+/**
+ * ubi_sysfs_init - initialize sysfs for an UBI device.
+ * @ubi: UBI device description object
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+static int ubi_sysfs_init(struct ubi_device *ubi)
+{
+ int err;
+
+ ubi->dev.release = dev_release;
+ ubi->dev.devt = MKDEV(ubi->major, 0);
+ ubi->dev.class = ubi_class;
+ sprintf(&ubi->dev.bus_id[0], UBI_NAME_STR"%d", ubi->ubi_num);
+ err = device_register(&ubi->dev);
+ if (err)
+ goto out;
+
+ err = device_create_file(&ubi->dev, &dev_eraseblock_size);
+ if (err)
+ goto out_unregister;
+ err = device_create_file(&ubi->dev, &dev_avail_eraseblocks);
+ if (err)
+ goto out_eraseblock_size;
+ err = device_create_file(&ubi->dev, &dev_total_eraseblocks);
+ if (err)
+ goto out_avail_eraseblocks;
+ err = device_create_file(&ubi->dev, &dev_volumes_count);
+ if (err)
+ goto out_total_eraseblocks;
+ err = device_create_file(&ubi->dev, &dev_max_ec);
+ if (err)
+ goto out_volumes_count;
+ err = device_create_file(&ubi->dev, &dev_reserved_for_bad);
+ if (err)
+ goto out_volumes_max_ec;
+ err = device_create_file(&ubi->dev, &dev_bad_peb_count);
+ if (err)
+ goto out_reserved_for_bad;
+ err = device_create_file(&ubi->dev, &dev_max_vol_count);
+ if (err)
+ goto out_bad_peb_count;
+ err = device_create_file(&ubi->dev, &dev_min_io_size);
+ if (err)
+ goto out_max_vol_count;
+ err = device_create_file(&ubi->dev, &dev_bgt_enabled);
+ if (err)
+ goto out_min_io_size;
+
+ return 0;
+
+out_min_io_size:
+ device_remove_file(&ubi->dev, &dev_min_io_size);
+out_max_vol_count:
+ device_remove_file(&ubi->dev, &dev_max_vol_count);
+out_bad_peb_count:
+ device_remove_file(&ubi->dev, &dev_bad_peb_count);
+out_reserved_for_bad:
+ device_remove_file(&ubi->dev, &dev_reserved_for_bad);
+out_volumes_max_ec:
+ device_remove_file(&ubi->dev, &dev_max_ec);
+out_volumes_count:
+ device_remove_file(&ubi->dev, &dev_volumes_count);
+out_total_eraseblocks:
+ device_remove_file(&ubi->dev, &dev_total_eraseblocks);
+out_avail_eraseblocks:
+ device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
+out_eraseblock_size:
+ device_remove_file(&ubi->dev, &dev_eraseblock_size);
+out_unregister:
+ device_unregister(&ubi->dev);
+out:
+ ubi_err("failed to initialize sysfs for %s", ubi->ubi_name);
+ return err;
+}
+
+/**
+ * ubi_sysfs_close - close sysfs for an UBI device.
+ * @ubi: UBI device description object
+ */
+static void ubi_sysfs_close(struct ubi_device *ubi)
+{
+ device_remove_file(&ubi->dev, &dev_bgt_enabled);
+ device_remove_file(&ubi->dev, &dev_min_io_size);
+ device_remove_file(&ubi->dev, &dev_max_vol_count);
+ device_remove_file(&ubi->dev, &dev_bad_peb_count);
+ device_remove_file(&ubi->dev, &dev_reserved_for_bad);
+ device_remove_file(&ubi->dev, &dev_max_ec);
+ device_remove_file(&ubi->dev, &dev_volumes_count);
+ device_remove_file(&ubi->dev, &dev_total_eraseblocks);
+ device_remove_file(&ubi->dev, &dev_avail_eraseblocks);
+ device_remove_file(&ubi->dev, &dev_eraseblock_size);
+ device_unregister(&ubi->dev);
+}
+
+/**
+ * kill_volumes - destroy all volumes.
+ * @ubi: UBI device description object
+ */
+static void kill_volumes(struct ubi_device *ubi)
+{
+ int i;
+
+ for (i = 0; i < ubi->vtbl_slots; i++)
+ if (ubi->volumes[i])
+ ubi_free_volume(ubi, i);
+}
+
+/**
+ * uif_init - initialize user interfaces for an UBI device.
+ * @ubi: UBI device description object
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+static int uif_init(struct ubi_device *ubi)
+{
+ int i, err;
+ dev_t dev;
+
+ mutex_init(&ubi->vtbl_mutex);
+ spin_lock_init(&ubi->volumes_lock);
+
+ sprintf(ubi->ubi_name, UBI_NAME_STR "%d", ubi->ubi_num);
+
+ /*
+ * Major numbers for the UBI character devices are allocated
+ * dynamically. Major numbers of volume character devices are
+ * equivalent to ones of the corresponding UBI character device. Minor
+ * numbers of UBI character devices are 0, while minor numbers of
+ * volume character devices start from 1. Thus, we allocate one major
+ * number and ubi->vtbl_slots + 1 minor numbers.
+ */
+ err = alloc_chrdev_region(&dev, 0, ubi->vtbl_slots + 1, ubi->ubi_name);
+ if (err) {
+ ubi_err("cannot register UBI character devices");
+ return err;
+ }
+
+ cdev_init(&ubi->cdev, &ubi_cdev_operations);
+ ubi->major = MAJOR(dev);
+ dbg_msg("%s major is %u", ubi->ubi_name, ubi->major);
+ ubi->cdev.owner = THIS_MODULE;
+
+ dev = MKDEV(ubi->major, 0);
+ err = cdev_add(&ubi->cdev, dev, 1);
+ if (err) {
+ ubi_err("cannot add character device %s", ubi->ubi_name);
+ goto out_unreg;
+ }
+
+ err = ubi_sysfs_init(ubi);
+ if (err)
+ goto out_cdev;
+
+ for (i = 0; i < ubi->vtbl_slots; i++)
+ if (ubi->volumes[i]) {
+ err = ubi_add_volume(ubi, i);
+ if (err)
+ goto out_volumes;
+ }
+
+ return 0;
+
+out_volumes:
+ kill_volumes(ubi);
+ ubi_sysfs_close(ubi);
+out_cdev:
+ cdev_del(&ubi->cdev);
+out_unreg:
+ unregister_chrdev_region(MKDEV(ubi->major, 0),
+ ubi->vtbl_slots + 1);
+ return err;
+}
+
+/**
+ * uif_close - close user interfaces for an UBI device.
+ * @ubi: UBI device description object
+ */
+static void uif_close(struct ubi_device *ubi)
+{
+ kill_volumes(ubi);
+ ubi_sysfs_close(ubi);
+ cdev_del(&ubi->cdev);
+ unregister_chrdev_region(MKDEV(ubi->major, 0), ubi->vtbl_slots + 1);
+}
+
+/**
+ * attach_by_scanning - attach an MTD device using scanning method.
+ * @ubi: UBI device descriptor
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ *
+ * Note, currently this is the only method to attach UBI devices. Hopefully in
+ * the future we'll have more scalable attaching methods and avoid full media
+ * scanning. But even in this case scanning will be needed as a fall-back
+ * attaching method if there are some on-flash table corruptions.
+ */
+static int attach_by_scanning(struct ubi_device *ubi)
+{
+ int err;
+ struct ubi_scan_info *si;
+
+ si = ubi_scan(ubi);
+ if (IS_ERR(si))
+ return PTR_ERR(si);
+
+ ubi->bad_peb_count = si->bad_peb_count;
+ ubi->good_peb_count = ubi->peb_count - ubi->bad_peb_count;
+ ubi->max_ec = si->max_ec;
+ ubi->mean_ec = si->mean_ec;
+
+ err = ubi_read_volume_table(ubi, si);
+ if (err)
+ goto out_si;
+
+ err = ubi_wl_init_scan(ubi, si);
+ if (err)
+ goto out_vtbl;
+
+ err = ubi_eba_init_scan(ubi, si);
+ if (err)
+ goto out_wl;
+
+ ubi_scan_destroy_si(si);
+ return 0;
+
+out_wl:
+ ubi_wl_close(ubi);
+out_vtbl:
+ kfree(ubi->vtbl);
+out_si:
+ ubi_scan_destroy_si(si);
+ return err;
+}
+
+/**
+ * io_init - initialize I/O unit for a given UBI device.
+ * @ubi: UBI device description object
+ *
+ * If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
+ * assumed:
+ * o EC header is always at offset zero - this cannot be changed;
+ * o VID header starts just after the EC header at the closest address
+ * aligned to @io->@hdrs_min_io_size;
+ * o data starts just after the VID header at the closest address aligned to
+ * @io->@min_io_size
+ *
+ * This function returns zero in case of success and a negative error code in
+ * case of failure.
+ */
+static int io_init(struct ubi_device *ubi)
+{
+ if (ubi->mtd->numeraseregions != 0) {
+ /*
+ * Some flashes have several erase regions. Different regions
+ * may have different eraseblock size and other
+ * characteristics. It looks like mostly multi-region flashes
+ * have one "main" region and one or more small regions to
+ * store boot loader code or boot parameters or whatever. I
+ * guess we should just pick the largest region. But this is
+ * not implemented.
+ */
+ ubi_err("multiple regions, not implemented");
+ return -EINVAL;
+ }
+
+ /*
+ * Note, in this implementation we support MTD devices with 0x7FFFFFFF
+ * physical eraseblocks maximum.
+ */
+
+ ubi->peb_size = ubi->mtd->erasesize;
+ ubi->peb_count = ubi->mtd->size / ubi->mtd->erasesize;
+ ubi->flash_size = ubi->mtd->size;
+
+ if (ubi->mtd->block_isbad && ubi->mtd->block_markbad)
+ ubi->bad_allowed = 1;
+
+ ubi->min_io_size = ubi->mtd->writesize;
+ ubi->hdrs_min_io_size = ubi->mtd->writesize >> ubi->mtd->subpage_sft;
+
+ ubi_assert(ubi->hdrs_min_io_size > 0);
+ ubi_assert(ubi->hdrs_min_io_size <= ubi->min_io_size);
+ ubi_assert(ubi->min_io_size % ubi->hdrs_min_io_size == 0);
+
+ /* Calculate default aligned sizes of EC and VID headers */
+ ubi->ec_hdr_alsize = ubi_align_up(UBI_EC_HDR_SIZE,
+ ubi->hdrs_min_io_size);
+ ubi->vid_hdr_alsize = ubi_align_up(UBI_VID_HDR_SIZE,
+ ubi->hdrs_min_io_size);
+
+ dbg_msg("min_io_size %d", ubi->min_io_size);
+ dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
+ dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
+ dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
+
+ if (ubi->vid_hdr_offset == 0)
+ /* Default offset */
+ ubi->vid_hdr_offset = ubi->vid_hdr_aloffset =
+ ubi->ec_hdr_alsize;
+ else {
+ ubi->vid_hdr_aloffset = ubi_align_down(ubi->vid_hdr_offset,
+ ubi->hdrs_min_io_size);
+ ubi->vid_hdr_shift = ubi->vid_hdr_offset -
+ ubi->vid_hdr_aloffset;
+ }
+
+ /* Similar for the data offset */
+ if (ubi->leb_start == 0) {
+ ubi->leb_start = ubi->vid_hdr_offset + ubi->vid_hdr_alsize;
+ ubi->leb_start = ubi_align_up(ubi->leb_start, ubi->min_io_size);
+ }
+
+ dbg_msg("vid_hdr_offset %d", ubi->vid_hdr_offset);
+ dbg_msg("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
+ dbg_msg("vid_hdr_shift %d", ubi->vid_hdr_shift);
+ dbg_msg("leb_start %d", ubi->leb_start);
+
+ /* The shift must be aligned to 32-bit boundary */
+ if (ubi->vid_hdr_shift % 4) {
+ ubi_err("unaligned VID header shift %d",
+ ubi->vid_hdr_shift);
+ return -EINVAL;
+ }
+
+ /* Check sanity */
+ if (ubi->vid_hdr_offset < UBI_EC_HDR_SIZE ||
+ ubi->leb_start < ubi->vid_hdr_offset + UBI_VID_HDR_SIZE ||
+ ubi->leb_start > ubi->peb_size - UBI_VID_HDR_SIZE ||
+ ubi->leb_start % ubi->min_io_size) {
+ ubi_err("bad VID header (%d) or data offsets (%d)",
+ ubi->vid_hdr_offset, ubi->leb_start);
+ return -EINVAL;
+ }
+
+ /*
+ * It may happen that EC and VID headers are situated in one minimal
+ * I/O unit. In this case we can only accept this UBI image in
+ * read-only mode.
+ */
+ if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
+ ubi_warn("EC and VID headers are in the same minimal I/O unit, "
+ "switch to read-only mode");
+ ubi->ro_mode = 1;
+ }
+
+ ubi->leb_size = ubi->peb_size - ubi->leb_start;
+
+ if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
+ ubi_msg("MTD device %d is write-protected, attach in "
+ "read-only mode", ubi->mtd->index);
+ ubi->ro_mode = 1;
+ }
+
+ dbg_msg("leb_size %d", ubi->leb_size);
+ dbg_msg("ro_mode %d", ubi->ro_mode);
+
+ /*
+ * Note, ideally, we have to initialize ubi->bad_peb_count here. But
+ * unfortunately, MTD does not provide this information. We should loop
+ * over all physical eraseblocks and invoke mtd->block_is_bad() for
+ * each physical eraseblock. So, we skip ubi->bad_peb_count
+ * uninitialized and initialize it after scanning.
+ */
+
+ return 0;
+}
+
+/**
+ * attach_mtd_dev - attach an MTD device.
+ * @mtd_dev: MTD device name or number string
+ * @vid_hdr_offset: VID header offset
+ * @data_offset: data offset
+ *
+ * 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 attach_mtd_dev(const char *mtd_dev, int vid_hdr_offset,
+ int data_offset)
+{
+ struct ubi_device *ubi;
+ struct mtd_info *mtd;
+ int i, err;
+
+ mtd = get_mtd_device_nm(mtd_dev);
+ if (IS_ERR(mtd)) {
+ int mtd_num;
+ char *endp;
+
+ if (PTR_ERR(mtd) != -ENODEV)
+ return PTR_ERR(mtd);
+
+ /*
+ * Probably this is not MTD device name but MTD device number -
+ * check this out.
+ */
+ 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);
+ }
+
+ /* Check if we already have the same MTD device attached */
+ for (i = 0; i < ubi_devices_cnt; i++)
+ if (ubi_devices[i]->mtd->index == mtd->index) {
+ ubi_err("mtd%d is already attached to ubi%d",
+ mtd->index, i);
+ err = -EINVAL;
+ goto out_mtd;
+ }
+
+ ubi = ubi_devices[ubi_devices_cnt] = kzalloc(sizeof(struct ubi_device),
+ GFP_KERNEL);
+ if (!ubi) {
+ err = -ENOMEM;
+ goto out_mtd;
+ }
+
+ ubi->ubi_num = ubi_devices_cnt;
+ ubi->mtd = mtd;
+
+ dbg_msg("attaching mtd%d to ubi%d: VID header offset %d data offset %d",
+ ubi->mtd->index, ubi_devices_cnt, vid_hdr_offset, data_offset);
+
+ ubi->vid_hdr_offset = vid_hdr_offset;
+ ubi->leb_start = data_offset;
+ err = io_init(ubi);
+ if (err)
+ goto out_free;
+
+ err = attach_by_scanning(ubi);
+ if (err) {
+ dbg_err("failed to attach by scanning, error %d", err);
+ goto out_free;
+ }
+
+ err = uif_init(ubi);
+ if (err)
+ goto out_detach;
+
+ ubi_devices_cnt += 1;
+
+ ubi_msg("attached mtd%d to ubi%d", ubi->mtd->index, ubi_devices_cnt);
+ ubi_msg("MTD device name: \"%s\"", ubi->mtd->name);
+ ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
+ ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
+ ubi->peb_size, ubi->peb_size >> 10);
+ ubi_msg("logical eraseblock size: %d bytes", ubi->leb_size);
+ ubi_msg("number of good PEBs: %d", ubi->good_peb_count);
+ ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
+ ubi_msg("smallest flash I/O unit: %d", ubi->min_io_size);
+ ubi_msg("VID header offset: %d (aligned %d)",
+ ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
+ ubi_msg("data offset: %d", ubi->leb_start);
+ ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots);
+ ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
+ ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
+ ubi_msg("number of user volumes: %d",
+ ubi->vol_count - UBI_INT_VOL_COUNT);
+ ubi_msg("available PEBs: %d", ubi->avail_pebs);
+ ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
+ ubi_msg("number of PEBs reserved for bad PEB handling: %d",
+ ubi->beb_rsvd_pebs);
+ ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
+
+ /* Enable the background thread */
+ if (!DBG_DISABLE_BGT) {
+ ubi->thread_enabled = 1;
+ wake_up_process(ubi->bgt_thread);
+ }
+
+ return 0;
+
+out_detach:
+ ubi_eba_close(ubi);
+ ubi_wl_close(ubi);
+ kfree(ubi->vtbl);
+out_free:
+ kfree(ubi);
+out_mtd:
+ put_mtd_device(mtd);
+ ubi_devices[ubi_devices_cnt] = NULL;
+ return err;
+}
+
+/**
+ * detach_mtd_dev - detach an MTD device.
+ * @ubi: UBI device description object
+ */
+static void detach_mtd_dev(struct ubi_device *ubi)
+{
+ int ubi_num = ubi->ubi_num, mtd_num = ubi->mtd->index;
+
+ dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
+ uif_close(ubi);
+ ubi_eba_close(ubi);
+ ubi_wl_close(ubi);
+ kfree(ubi->vtbl);
+ put_mtd_device(ubi->mtd);
+ kfree(ubi_devices[ubi_num]);
+ ubi_devices[ubi_num] = NULL;
+ ubi_devices_cnt -= 1;
+ ubi_assert(ubi_devices_cnt >= 0);
+ ubi_msg("mtd% is detached from ubi%d", mtd_num, ubi_num);
+}
+
+static int __init ubi_init(void)
+{
+ int err, i, k;
+
+ /* Ensure that EC and VID headers have correct size */
+ BUILD_BUG_ON(sizeof(struct ubi_ec_hdr) != 64);
+ BUILD_BUG_ON(sizeof(struct ubi_vid_hdr) != 64);
+
+ if (mtd_devs > UBI_MAX_DEVICES) {
+ printk("UBI error: too many MTD devices, maximum is %d\n",
+ UBI_MAX_DEVICES);
+ return -EINVAL;
+ }
+
+ ubi_class = class_create(THIS_MODULE, UBI_NAME_STR);
+ if (IS_ERR(ubi_class))
+ return PTR_ERR(ubi_class);
+
+ err = class_create_file(ubi_class, &ubi_version);
+ if (err)
+ goto out_class;
+
+ /* Attach MTD devices */
+ for (i = 0; i < mtd_devs; i++) {
+ struct mtd_dev_param *p = &mtd_dev_param[i];
+
+ cond_resched();
+
+ if (!p->name) {
+ dbg_err("empty name");
+ err = -EINVAL;
+ goto out_detach;
+ }
+
+ err = 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++)
+ detach_mtd_dev(ubi_devices[k]);
+ class_remove_file(ubi_class, &ubi_version);
+out_class:
+ class_destroy(ubi_class);
+ return err;
+}
+module_init(ubi_init);
+
+static void __exit ubi_exit(void)
+{
+ int i, n = ubi_devices_cnt;
+
+ for (i = 0; i < n; i++)
+ detach_mtd_dev(ubi_devices[i]);
+ class_remove_file(ubi_class, &ubi_version);
+ class_destroy(ubi_class);
+}
+module_exit(ubi_exit);
+
+/**
+ * bytes_str_to_int - convert a string representing 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;
+}
+
+/**
+ * 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[MTD_PARAM_LEN_MAX];
+ char *pbuf = &buf[0];
+ char *tokens[3] = {NULL, NULL, NULL};
+
+ if (mtd_devs == UBI_MAX_DEVICES) {
+ printk("UBI error: too many parameters, max. is %d\n",
+ UBI_MAX_DEVICES);
+ return -EINVAL;
+ }
+
+ len = strnlen(val, MTD_PARAM_LEN_MAX);
+ if (len == MTD_PARAM_LEN_MAX) {
+ printk("UBI error: parameter \"%s\" is too long, max. is %d\n",
+ val, 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;
+}
+
+module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
+MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
+ "mtd=<name|num>[,<vid_hdr_offs>,<data_offs>]. "
+ "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 Bityutskiy");
+MODULE_LICENSE("GPL");
-
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