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85516a9881
While at first mtd_part_of_parse() would just call
of_get_chil_by_name(), it has been patched to deal with sub-partitions
and will now directly manipulate the node returned by mtd_get_of_node()
if the MTD device is a partition.
A of_node_put() was a bit below in the code, to balance the
of_get_child_by_name(). However, despite its name, mtd_get_of_node()
does not take a reference on the OF node. It is a simple helper hiding
some pointer logic to retrieve the OF node related to an MTD
device.
The direct effect of such unbalanced reference counting is visible by
rmmod'ing any module that would have added MTD partitions:
OF: ERROR: Bad of_node_put() on <of_path_to_partition>
As it seems normal to get a reference on the OF node during the
of_property_for_each_string() that follows, add a call to
of_node_get() when relevant.
Fixes: 76a832254a
("mtd: partitions: use DT info for parsing partitions with "compatible" prop")
Cc: stable@vger.kernel.org
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
1027 lines
28 KiB
C
1027 lines
28 KiB
C
/*
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* Simple MTD partitioning layer
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*
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* Copyright © 2000 Nicolas Pitre <nico@fluxnic.net>
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* Copyright © 2002 Thomas Gleixner <gleixner@linutronix.de>
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* Copyright © 2000-2010 David Woodhouse <dwmw2@infradead.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/list.h>
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#include <linux/kmod.h>
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#include <linux/mtd/mtd.h>
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#include <linux/mtd/partitions.h>
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#include <linux/err.h>
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#include <linux/of.h>
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#include "mtdcore.h"
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/* Our partition linked list */
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static LIST_HEAD(mtd_partitions);
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static DEFINE_MUTEX(mtd_partitions_mutex);
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/**
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* struct mtd_part - our partition node structure
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*
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* @mtd: struct holding partition details
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* @parent: parent mtd - flash device or another partition
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* @offset: partition offset relative to the *flash device*
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*/
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struct mtd_part {
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struct mtd_info mtd;
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struct mtd_info *parent;
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uint64_t offset;
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struct list_head list;
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};
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/*
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* Given a pointer to the MTD object in the mtd_part structure, we can retrieve
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* the pointer to that structure.
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*/
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static inline struct mtd_part *mtd_to_part(const struct mtd_info *mtd)
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{
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return container_of(mtd, struct mtd_part, mtd);
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}
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/*
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* MTD methods which simply translate the effective address and pass through
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* to the _real_ device.
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*/
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static int part_read(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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struct mtd_ecc_stats stats;
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int res;
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stats = part->parent->ecc_stats;
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res = part->parent->_read(part->parent, from + part->offset, len,
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retlen, buf);
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if (unlikely(mtd_is_eccerr(res)))
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mtd->ecc_stats.failed +=
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part->parent->ecc_stats.failed - stats.failed;
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else
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mtd->ecc_stats.corrected +=
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part->parent->ecc_stats.corrected - stats.corrected;
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return res;
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}
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static int part_point(struct mtd_info *mtd, loff_t from, size_t len,
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size_t *retlen, void **virt, resource_size_t *phys)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_point(part->parent, from + part->offset, len,
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retlen, virt, phys);
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}
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static int part_unpoint(struct mtd_info *mtd, loff_t from, size_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_unpoint(part->parent, from + part->offset, len);
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}
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static int part_read_oob(struct mtd_info *mtd, loff_t from,
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struct mtd_oob_ops *ops)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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struct mtd_ecc_stats stats;
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int res;
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stats = part->parent->ecc_stats;
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res = part->parent->_read_oob(part->parent, from + part->offset, ops);
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if (unlikely(mtd_is_eccerr(res)))
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mtd->ecc_stats.failed +=
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part->parent->ecc_stats.failed - stats.failed;
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else
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mtd->ecc_stats.corrected +=
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part->parent->ecc_stats.corrected - stats.corrected;
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return res;
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}
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static int part_read_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_read_user_prot_reg(part->parent, from, len,
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retlen, buf);
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}
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static int part_get_user_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_get_user_prot_info(part->parent, len, retlen,
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buf);
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}
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static int part_read_fact_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_read_fact_prot_reg(part->parent, from, len,
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retlen, buf);
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}
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static int part_get_fact_prot_info(struct mtd_info *mtd, size_t len,
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size_t *retlen, struct otp_info *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_get_fact_prot_info(part->parent, len, retlen,
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buf);
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}
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static int part_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_write(part->parent, to + part->offset, len,
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retlen, buf);
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}
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static int part_panic_write(struct mtd_info *mtd, loff_t to, size_t len,
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size_t *retlen, const u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_panic_write(part->parent, to + part->offset, len,
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retlen, buf);
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}
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static int part_write_oob(struct mtd_info *mtd, loff_t to,
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struct mtd_oob_ops *ops)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_write_oob(part->parent, to + part->offset, ops);
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}
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static int part_write_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len, size_t *retlen, u_char *buf)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_write_user_prot_reg(part->parent, from, len,
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retlen, buf);
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}
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static int part_lock_user_prot_reg(struct mtd_info *mtd, loff_t from,
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size_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_lock_user_prot_reg(part->parent, from, len);
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}
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static int part_writev(struct mtd_info *mtd, const struct kvec *vecs,
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unsigned long count, loff_t to, size_t *retlen)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_writev(part->parent, vecs, count,
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to + part->offset, retlen);
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}
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static int part_erase(struct mtd_info *mtd, struct erase_info *instr)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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int ret;
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instr->addr += part->offset;
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ret = part->parent->_erase(part->parent, instr);
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if (instr->fail_addr != MTD_FAIL_ADDR_UNKNOWN)
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instr->fail_addr -= part->offset;
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instr->addr -= part->offset;
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return ret;
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}
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static int part_lock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_lock(part->parent, ofs + part->offset, len);
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}
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static int part_unlock(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_unlock(part->parent, ofs + part->offset, len);
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}
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static int part_is_locked(struct mtd_info *mtd, loff_t ofs, uint64_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_is_locked(part->parent, ofs + part->offset, len);
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}
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static void part_sync(struct mtd_info *mtd)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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part->parent->_sync(part->parent);
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}
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static int part_suspend(struct mtd_info *mtd)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_suspend(part->parent);
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}
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static void part_resume(struct mtd_info *mtd)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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part->parent->_resume(part->parent);
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}
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static int part_block_isreserved(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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ofs += part->offset;
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return part->parent->_block_isreserved(part->parent, ofs);
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}
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static int part_block_isbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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ofs += part->offset;
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return part->parent->_block_isbad(part->parent, ofs);
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}
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static int part_block_markbad(struct mtd_info *mtd, loff_t ofs)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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int res;
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ofs += part->offset;
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res = part->parent->_block_markbad(part->parent, ofs);
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if (!res)
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mtd->ecc_stats.badblocks++;
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return res;
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}
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static int part_get_device(struct mtd_info *mtd)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_get_device(part->parent);
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}
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static void part_put_device(struct mtd_info *mtd)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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part->parent->_put_device(part->parent);
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}
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static int part_ooblayout_ecc(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobregion)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return mtd_ooblayout_ecc(part->parent, section, oobregion);
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}
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static int part_ooblayout_free(struct mtd_info *mtd, int section,
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struct mtd_oob_region *oobregion)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return mtd_ooblayout_free(part->parent, section, oobregion);
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}
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static const struct mtd_ooblayout_ops part_ooblayout_ops = {
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.ecc = part_ooblayout_ecc,
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.free = part_ooblayout_free,
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};
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static int part_max_bad_blocks(struct mtd_info *mtd, loff_t ofs, size_t len)
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{
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struct mtd_part *part = mtd_to_part(mtd);
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return part->parent->_max_bad_blocks(part->parent,
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ofs + part->offset, len);
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}
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static inline void free_partition(struct mtd_part *p)
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{
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kfree(p->mtd.name);
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kfree(p);
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}
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static struct mtd_part *allocate_partition(struct mtd_info *parent,
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const struct mtd_partition *part, int partno,
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uint64_t cur_offset)
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{
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int wr_alignment = (parent->flags & MTD_NO_ERASE) ? parent->writesize :
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parent->erasesize;
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struct mtd_part *slave;
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u32 remainder;
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char *name;
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u64 tmp;
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/* allocate the partition structure */
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slave = kzalloc(sizeof(*slave), GFP_KERNEL);
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name = kstrdup(part->name, GFP_KERNEL);
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if (!name || !slave) {
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printk(KERN_ERR"memory allocation error while creating partitions for \"%s\"\n",
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parent->name);
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kfree(name);
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kfree(slave);
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return ERR_PTR(-ENOMEM);
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}
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/* set up the MTD object for this partition */
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slave->mtd.type = parent->type;
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slave->mtd.flags = parent->flags & ~part->mask_flags;
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slave->mtd.size = part->size;
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slave->mtd.writesize = parent->writesize;
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slave->mtd.writebufsize = parent->writebufsize;
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slave->mtd.oobsize = parent->oobsize;
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slave->mtd.oobavail = parent->oobavail;
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slave->mtd.subpage_sft = parent->subpage_sft;
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slave->mtd.pairing = parent->pairing;
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slave->mtd.name = name;
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slave->mtd.owner = parent->owner;
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/* NOTE: Historically, we didn't arrange MTDs as a tree out of
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* concern for showing the same data in multiple partitions.
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* However, it is very useful to have the master node present,
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* so the MTD_PARTITIONED_MASTER option allows that. The master
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* will have device nodes etc only if this is set, so make the
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* parent conditional on that option. Note, this is a way to
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* distinguish between the master and the partition in sysfs.
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*/
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slave->mtd.dev.parent = IS_ENABLED(CONFIG_MTD_PARTITIONED_MASTER) || mtd_is_partition(parent) ?
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&parent->dev :
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parent->dev.parent;
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slave->mtd.dev.of_node = part->of_node;
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if (parent->_read)
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slave->mtd._read = part_read;
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if (parent->_write)
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slave->mtd._write = part_write;
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if (parent->_panic_write)
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slave->mtd._panic_write = part_panic_write;
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if (parent->_point && parent->_unpoint) {
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slave->mtd._point = part_point;
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slave->mtd._unpoint = part_unpoint;
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}
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if (parent->_read_oob)
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slave->mtd._read_oob = part_read_oob;
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if (parent->_write_oob)
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slave->mtd._write_oob = part_write_oob;
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if (parent->_read_user_prot_reg)
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slave->mtd._read_user_prot_reg = part_read_user_prot_reg;
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if (parent->_read_fact_prot_reg)
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slave->mtd._read_fact_prot_reg = part_read_fact_prot_reg;
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if (parent->_write_user_prot_reg)
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slave->mtd._write_user_prot_reg = part_write_user_prot_reg;
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if (parent->_lock_user_prot_reg)
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slave->mtd._lock_user_prot_reg = part_lock_user_prot_reg;
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if (parent->_get_user_prot_info)
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slave->mtd._get_user_prot_info = part_get_user_prot_info;
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if (parent->_get_fact_prot_info)
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slave->mtd._get_fact_prot_info = part_get_fact_prot_info;
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if (parent->_sync)
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slave->mtd._sync = part_sync;
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if (!partno && !parent->dev.class && parent->_suspend &&
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parent->_resume) {
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slave->mtd._suspend = part_suspend;
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slave->mtd._resume = part_resume;
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}
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if (parent->_writev)
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slave->mtd._writev = part_writev;
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if (parent->_lock)
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slave->mtd._lock = part_lock;
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if (parent->_unlock)
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slave->mtd._unlock = part_unlock;
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if (parent->_is_locked)
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slave->mtd._is_locked = part_is_locked;
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if (parent->_block_isreserved)
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slave->mtd._block_isreserved = part_block_isreserved;
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if (parent->_block_isbad)
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slave->mtd._block_isbad = part_block_isbad;
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if (parent->_block_markbad)
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slave->mtd._block_markbad = part_block_markbad;
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if (parent->_max_bad_blocks)
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slave->mtd._max_bad_blocks = part_max_bad_blocks;
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if (parent->_get_device)
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slave->mtd._get_device = part_get_device;
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if (parent->_put_device)
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slave->mtd._put_device = part_put_device;
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slave->mtd._erase = part_erase;
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slave->parent = parent;
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slave->offset = part->offset;
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if (slave->offset == MTDPART_OFS_APPEND)
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slave->offset = cur_offset;
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if (slave->offset == MTDPART_OFS_NXTBLK) {
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tmp = cur_offset;
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slave->offset = cur_offset;
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remainder = do_div(tmp, wr_alignment);
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if (remainder) {
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slave->offset += wr_alignment - remainder;
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printk(KERN_NOTICE "Moving partition %d: "
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"0x%012llx -> 0x%012llx\n", partno,
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|
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
|
|
}
|
|
}
|
|
if (slave->offset == MTDPART_OFS_RETAIN) {
|
|
slave->offset = cur_offset;
|
|
if (parent->size - slave->offset >= slave->mtd.size) {
|
|
slave->mtd.size = parent->size - slave->offset
|
|
- slave->mtd.size;
|
|
} else {
|
|
printk(KERN_ERR "mtd partition \"%s\" doesn't have enough space: %#llx < %#llx, disabled\n",
|
|
part->name, parent->size - slave->offset,
|
|
slave->mtd.size);
|
|
/* register to preserve ordering */
|
|
goto out_register;
|
|
}
|
|
}
|
|
if (slave->mtd.size == MTDPART_SIZ_FULL)
|
|
slave->mtd.size = parent->size - slave->offset;
|
|
|
|
printk(KERN_NOTICE "0x%012llx-0x%012llx : \"%s\"\n", (unsigned long long)slave->offset,
|
|
(unsigned long long)(slave->offset + slave->mtd.size), slave->mtd.name);
|
|
|
|
/* let's do some sanity checks */
|
|
if (slave->offset >= parent->size) {
|
|
/* let's register it anyway to preserve ordering */
|
|
slave->offset = 0;
|
|
slave->mtd.size = 0;
|
|
printk(KERN_ERR"mtd: partition \"%s\" is out of reach -- disabled\n",
|
|
part->name);
|
|
goto out_register;
|
|
}
|
|
if (slave->offset + slave->mtd.size > parent->size) {
|
|
slave->mtd.size = parent->size - slave->offset;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#llx\n",
|
|
part->name, parent->name, (unsigned long long)slave->mtd.size);
|
|
}
|
|
if (parent->numeraseregions > 1) {
|
|
/* Deal with variable erase size stuff */
|
|
int i, max = parent->numeraseregions;
|
|
u64 end = slave->offset + slave->mtd.size;
|
|
struct mtd_erase_region_info *regions = parent->eraseregions;
|
|
|
|
/* Find the first erase regions which is part of this
|
|
* partition. */
|
|
for (i = 0; i < max && regions[i].offset <= slave->offset; i++)
|
|
;
|
|
/* The loop searched for the region _behind_ the first one */
|
|
if (i > 0)
|
|
i--;
|
|
|
|
/* Pick biggest erasesize */
|
|
for (; i < max && regions[i].offset < end; i++) {
|
|
if (slave->mtd.erasesize < regions[i].erasesize) {
|
|
slave->mtd.erasesize = regions[i].erasesize;
|
|
}
|
|
}
|
|
BUG_ON(slave->mtd.erasesize == 0);
|
|
} else {
|
|
/* Single erase size */
|
|
slave->mtd.erasesize = parent->erasesize;
|
|
}
|
|
|
|
/*
|
|
* Slave erasesize might differ from the master one if the master
|
|
* exposes several regions with different erasesize. Adjust
|
|
* wr_alignment accordingly.
|
|
*/
|
|
if (!(slave->mtd.flags & MTD_NO_ERASE))
|
|
wr_alignment = slave->mtd.erasesize;
|
|
|
|
tmp = slave->offset;
|
|
remainder = do_div(tmp, wr_alignment);
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
|
|
/* Doesn't start on a boundary of major erase size */
|
|
/* FIXME: Let it be writable if it is on a boundary of
|
|
* _minor_ erase size though */
|
|
slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
|
|
part->name);
|
|
}
|
|
|
|
tmp = slave->mtd.size;
|
|
remainder = do_div(tmp, wr_alignment);
|
|
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
|
|
slave->mtd.flags &= ~MTD_WRITEABLE;
|
|
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
|
|
part->name);
|
|
}
|
|
|
|
mtd_set_ooblayout(&slave->mtd, &part_ooblayout_ops);
|
|
slave->mtd.ecc_step_size = parent->ecc_step_size;
|
|
slave->mtd.ecc_strength = parent->ecc_strength;
|
|
slave->mtd.bitflip_threshold = parent->bitflip_threshold;
|
|
|
|
if (parent->_block_isbad) {
|
|
uint64_t offs = 0;
|
|
|
|
while (offs < slave->mtd.size) {
|
|
if (mtd_block_isreserved(parent, offs + slave->offset))
|
|
slave->mtd.ecc_stats.bbtblocks++;
|
|
else if (mtd_block_isbad(parent, offs + slave->offset))
|
|
slave->mtd.ecc_stats.badblocks++;
|
|
offs += slave->mtd.erasesize;
|
|
}
|
|
}
|
|
|
|
out_register:
|
|
return slave;
|
|
}
|
|
|
|
static ssize_t mtd_partition_offset_show(struct device *dev,
|
|
struct device_attribute *attr, char *buf)
|
|
{
|
|
struct mtd_info *mtd = dev_get_drvdata(dev);
|
|
struct mtd_part *part = mtd_to_part(mtd);
|
|
return snprintf(buf, PAGE_SIZE, "%lld\n", part->offset);
|
|
}
|
|
|
|
static DEVICE_ATTR(offset, S_IRUGO, mtd_partition_offset_show, NULL);
|
|
|
|
static const struct attribute *mtd_partition_attrs[] = {
|
|
&dev_attr_offset.attr,
|
|
NULL
|
|
};
|
|
|
|
static int mtd_add_partition_attrs(struct mtd_part *new)
|
|
{
|
|
int ret = sysfs_create_files(&new->mtd.dev.kobj, mtd_partition_attrs);
|
|
if (ret)
|
|
printk(KERN_WARNING
|
|
"mtd: failed to create partition attrs, err=%d\n", ret);
|
|
return ret;
|
|
}
|
|
|
|
int mtd_add_partition(struct mtd_info *parent, const char *name,
|
|
long long offset, long long length)
|
|
{
|
|
struct mtd_partition part;
|
|
struct mtd_part *new;
|
|
int ret = 0;
|
|
|
|
/* the direct offset is expected */
|
|
if (offset == MTDPART_OFS_APPEND ||
|
|
offset == MTDPART_OFS_NXTBLK)
|
|
return -EINVAL;
|
|
|
|
if (length == MTDPART_SIZ_FULL)
|
|
length = parent->size - offset;
|
|
|
|
if (length <= 0)
|
|
return -EINVAL;
|
|
|
|
memset(&part, 0, sizeof(part));
|
|
part.name = name;
|
|
part.size = length;
|
|
part.offset = offset;
|
|
|
|
new = allocate_partition(parent, &part, -1, offset);
|
|
if (IS_ERR(new))
|
|
return PTR_ERR(new);
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_add(&new->list, &mtd_partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(&new->mtd);
|
|
|
|
mtd_add_partition_attrs(new);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_add_partition);
|
|
|
|
/**
|
|
* __mtd_del_partition - delete MTD partition
|
|
*
|
|
* @priv: internal MTD struct for partition to be deleted
|
|
*
|
|
* This function must be called with the partitions mutex locked.
|
|
*/
|
|
static int __mtd_del_partition(struct mtd_part *priv)
|
|
{
|
|
struct mtd_part *child, *next;
|
|
int err;
|
|
|
|
list_for_each_entry_safe(child, next, &mtd_partitions, list) {
|
|
if (child->parent == &priv->mtd) {
|
|
err = __mtd_del_partition(child);
|
|
if (err)
|
|
return err;
|
|
}
|
|
}
|
|
|
|
sysfs_remove_files(&priv->mtd.dev.kobj, mtd_partition_attrs);
|
|
|
|
err = del_mtd_device(&priv->mtd);
|
|
if (err)
|
|
return err;
|
|
|
|
list_del(&priv->list);
|
|
free_partition(priv);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This function unregisters and destroy all slave MTD objects which are
|
|
* attached to the given MTD object.
|
|
*/
|
|
int del_mtd_partitions(struct mtd_info *mtd)
|
|
{
|
|
struct mtd_part *slave, *next;
|
|
int ret, err = 0;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
|
|
if (slave->parent == mtd) {
|
|
ret = __mtd_del_partition(slave);
|
|
if (ret < 0)
|
|
err = ret;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
int mtd_del_partition(struct mtd_info *mtd, int partno)
|
|
{
|
|
struct mtd_part *slave, *next;
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry_safe(slave, next, &mtd_partitions, list)
|
|
if ((slave->parent == mtd) &&
|
|
(slave->mtd.index == partno)) {
|
|
ret = __mtd_del_partition(slave);
|
|
break;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ret;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_del_partition);
|
|
|
|
/*
|
|
* This function, given a master MTD object and a partition table, creates
|
|
* and registers slave MTD objects which are bound to the master according to
|
|
* the partition definitions.
|
|
*
|
|
* For historical reasons, this function's caller only registers the master
|
|
* if the MTD_PARTITIONED_MASTER config option is set.
|
|
*/
|
|
|
|
int add_mtd_partitions(struct mtd_info *master,
|
|
const struct mtd_partition *parts,
|
|
int nbparts)
|
|
{
|
|
struct mtd_part *slave;
|
|
uint64_t cur_offset = 0;
|
|
int i;
|
|
|
|
printk(KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
|
|
|
|
for (i = 0; i < nbparts; i++) {
|
|
slave = allocate_partition(master, parts + i, i, cur_offset);
|
|
if (IS_ERR(slave)) {
|
|
del_mtd_partitions(master);
|
|
return PTR_ERR(slave);
|
|
}
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_add(&slave->list, &mtd_partitions);
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
add_mtd_device(&slave->mtd);
|
|
mtd_add_partition_attrs(slave);
|
|
/* Look for subpartitions */
|
|
parse_mtd_partitions(&slave->mtd, parts[i].types, NULL);
|
|
|
|
cur_offset = slave->offset + slave->mtd.size;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static DEFINE_SPINLOCK(part_parser_lock);
|
|
static LIST_HEAD(part_parsers);
|
|
|
|
static struct mtd_part_parser *mtd_part_parser_get(const char *name)
|
|
{
|
|
struct mtd_part_parser *p, *ret = NULL;
|
|
|
|
spin_lock(&part_parser_lock);
|
|
|
|
list_for_each_entry(p, &part_parsers, list)
|
|
if (!strcmp(p->name, name) && try_module_get(p->owner)) {
|
|
ret = p;
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static inline void mtd_part_parser_put(const struct mtd_part_parser *p)
|
|
{
|
|
module_put(p->owner);
|
|
}
|
|
|
|
/*
|
|
* Many partition parsers just expected the core to kfree() all their data in
|
|
* one chunk. Do that by default.
|
|
*/
|
|
static void mtd_part_parser_cleanup_default(const struct mtd_partition *pparts,
|
|
int nr_parts)
|
|
{
|
|
kfree(pparts);
|
|
}
|
|
|
|
int __register_mtd_parser(struct mtd_part_parser *p, struct module *owner)
|
|
{
|
|
p->owner = owner;
|
|
|
|
if (!p->cleanup)
|
|
p->cleanup = &mtd_part_parser_cleanup_default;
|
|
|
|
spin_lock(&part_parser_lock);
|
|
list_add(&p->list, &part_parsers);
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(__register_mtd_parser);
|
|
|
|
void deregister_mtd_parser(struct mtd_part_parser *p)
|
|
{
|
|
spin_lock(&part_parser_lock);
|
|
list_del(&p->list);
|
|
spin_unlock(&part_parser_lock);
|
|
}
|
|
EXPORT_SYMBOL_GPL(deregister_mtd_parser);
|
|
|
|
/*
|
|
* Do not forget to update 'parse_mtd_partitions()' kerneldoc comment if you
|
|
* are changing this array!
|
|
*/
|
|
static const char * const default_mtd_part_types[] = {
|
|
"cmdlinepart",
|
|
"ofpart",
|
|
NULL
|
|
};
|
|
|
|
/* Check DT only when looking for subpartitions. */
|
|
static const char * const default_subpartition_types[] = {
|
|
"ofpart",
|
|
NULL
|
|
};
|
|
|
|
static int mtd_part_do_parse(struct mtd_part_parser *parser,
|
|
struct mtd_info *master,
|
|
struct mtd_partitions *pparts,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
int ret;
|
|
|
|
ret = (*parser->parse_fn)(master, &pparts->parts, data);
|
|
pr_debug("%s: parser %s: %i\n", master->name, parser->name, ret);
|
|
if (ret <= 0)
|
|
return ret;
|
|
|
|
pr_notice("%d %s partitions found on MTD device %s\n", ret,
|
|
parser->name, master->name);
|
|
|
|
pparts->nr_parts = ret;
|
|
pparts->parser = parser;
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* mtd_part_get_compatible_parser - find MTD parser by a compatible string
|
|
*
|
|
* @compat: compatible string describing partitions in a device tree
|
|
*
|
|
* MTD parsers can specify supported partitions by providing a table of
|
|
* compatibility strings. This function finds a parser that advertises support
|
|
* for a passed value of "compatible".
|
|
*/
|
|
static struct mtd_part_parser *mtd_part_get_compatible_parser(const char *compat)
|
|
{
|
|
struct mtd_part_parser *p, *ret = NULL;
|
|
|
|
spin_lock(&part_parser_lock);
|
|
|
|
list_for_each_entry(p, &part_parsers, list) {
|
|
const struct of_device_id *matches;
|
|
|
|
matches = p->of_match_table;
|
|
if (!matches)
|
|
continue;
|
|
|
|
for (; matches->compatible[0]; matches++) {
|
|
if (!strcmp(matches->compatible, compat) &&
|
|
try_module_get(p->owner)) {
|
|
ret = p;
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (ret)
|
|
break;
|
|
}
|
|
|
|
spin_unlock(&part_parser_lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mtd_part_of_parse(struct mtd_info *master,
|
|
struct mtd_partitions *pparts)
|
|
{
|
|
struct mtd_part_parser *parser;
|
|
struct device_node *np;
|
|
struct property *prop;
|
|
const char *compat;
|
|
const char *fixed = "fixed-partitions";
|
|
int ret, err = 0;
|
|
|
|
np = mtd_get_of_node(master);
|
|
if (mtd_is_partition(master))
|
|
of_node_get(np);
|
|
else
|
|
np = of_get_child_by_name(np, "partitions");
|
|
|
|
of_property_for_each_string(np, "compatible", prop, compat) {
|
|
parser = mtd_part_get_compatible_parser(compat);
|
|
if (!parser)
|
|
continue;
|
|
ret = mtd_part_do_parse(parser, master, pparts, NULL);
|
|
if (ret > 0) {
|
|
of_node_put(np);
|
|
return ret;
|
|
}
|
|
mtd_part_parser_put(parser);
|
|
if (ret < 0 && !err)
|
|
err = ret;
|
|
}
|
|
of_node_put(np);
|
|
|
|
/*
|
|
* For backward compatibility we have to try the "fixed-partitions"
|
|
* parser. It supports old DT format with partitions specified as a
|
|
* direct subnodes of a flash device DT node without any compatibility
|
|
* specified we could match.
|
|
*/
|
|
parser = mtd_part_parser_get(fixed);
|
|
if (!parser && !request_module("%s", fixed))
|
|
parser = mtd_part_parser_get(fixed);
|
|
if (parser) {
|
|
ret = mtd_part_do_parse(parser, master, pparts, NULL);
|
|
if (ret > 0)
|
|
return ret;
|
|
mtd_part_parser_put(parser);
|
|
if (ret < 0 && !err)
|
|
err = ret;
|
|
}
|
|
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* parse_mtd_partitions - parse and register MTD partitions
|
|
*
|
|
* @master: the master partition (describes whole MTD device)
|
|
* @types: names of partition parsers to try or %NULL
|
|
* @data: MTD partition parser-specific data
|
|
*
|
|
* This function tries to find & register partitions on MTD device @master. It
|
|
* uses MTD partition parsers, specified in @types. However, if @types is %NULL,
|
|
* then the default list of parsers is used. The default list contains only the
|
|
* "cmdlinepart" and "ofpart" parsers ATM.
|
|
* Note: If there are more then one parser in @types, the kernel only takes the
|
|
* partitions parsed out by the first parser.
|
|
*
|
|
* This function may return:
|
|
* o a negative error code in case of failure
|
|
* o number of found partitions otherwise
|
|
*/
|
|
int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
|
|
struct mtd_part_parser_data *data)
|
|
{
|
|
struct mtd_partitions pparts = { };
|
|
struct mtd_part_parser *parser;
|
|
int ret, err = 0;
|
|
|
|
if (!types)
|
|
types = mtd_is_partition(master) ? default_subpartition_types :
|
|
default_mtd_part_types;
|
|
|
|
for ( ; *types; types++) {
|
|
/*
|
|
* ofpart is a special type that means OF partitioning info
|
|
* should be used. It requires a bit different logic so it is
|
|
* handled in a separated function.
|
|
*/
|
|
if (!strcmp(*types, "ofpart")) {
|
|
ret = mtd_part_of_parse(master, &pparts);
|
|
} else {
|
|
pr_debug("%s: parsing partitions %s\n", master->name,
|
|
*types);
|
|
parser = mtd_part_parser_get(*types);
|
|
if (!parser && !request_module("%s", *types))
|
|
parser = mtd_part_parser_get(*types);
|
|
pr_debug("%s: got parser %s\n", master->name,
|
|
parser ? parser->name : NULL);
|
|
if (!parser)
|
|
continue;
|
|
ret = mtd_part_do_parse(parser, master, &pparts, data);
|
|
if (ret <= 0)
|
|
mtd_part_parser_put(parser);
|
|
}
|
|
/* Found partitions! */
|
|
if (ret > 0) {
|
|
err = add_mtd_partitions(master, pparts.parts,
|
|
pparts.nr_parts);
|
|
mtd_part_parser_cleanup(&pparts);
|
|
return err ? err : pparts.nr_parts;
|
|
}
|
|
/*
|
|
* Stash the first error we see; only report it if no parser
|
|
* succeeds
|
|
*/
|
|
if (ret < 0 && !err)
|
|
err = ret;
|
|
}
|
|
return err;
|
|
}
|
|
|
|
void mtd_part_parser_cleanup(struct mtd_partitions *parts)
|
|
{
|
|
const struct mtd_part_parser *parser;
|
|
|
|
if (!parts)
|
|
return;
|
|
|
|
parser = parts->parser;
|
|
if (parser) {
|
|
if (parser->cleanup)
|
|
parser->cleanup(parts->parts, parts->nr_parts);
|
|
|
|
mtd_part_parser_put(parser);
|
|
}
|
|
}
|
|
|
|
int mtd_is_partition(const struct mtd_info *mtd)
|
|
{
|
|
struct mtd_part *part;
|
|
int ispart = 0;
|
|
|
|
mutex_lock(&mtd_partitions_mutex);
|
|
list_for_each_entry(part, &mtd_partitions, list)
|
|
if (&part->mtd == mtd) {
|
|
ispart = 1;
|
|
break;
|
|
}
|
|
mutex_unlock(&mtd_partitions_mutex);
|
|
|
|
return ispart;
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_is_partition);
|
|
|
|
/* Returns the size of the entire flash chip */
|
|
uint64_t mtd_get_device_size(const struct mtd_info *mtd)
|
|
{
|
|
if (!mtd_is_partition(mtd))
|
|
return mtd->size;
|
|
|
|
return mtd_get_device_size(mtd_to_part(mtd)->parent);
|
|
}
|
|
EXPORT_SYMBOL_GPL(mtd_get_device_size);
|