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![Miquel Raynal](/assets/img/avatar_default.png)
Instead of collecting partitions in a flat list, create a hierarchy within the mtd_info structure: use a partitions list to keep track of the partitions of an MTD device (which might be itself a partition of another MTD device), a pointer to the parent device (NULL when the MTD device is the root one, not a partition). By also saving directly in mtd_info the offset of the partition, we can get rid of the mtd_part structure. While at it, be consistent in the naming of the mtd_info structures to ease the understanding of the new hierarchy: these structures are usually called 'mtd', unless there are multiple instances of the same structure. In this case, there is usually a parent/child bound so we will call them 'parent' and 'child'. Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com> Link: https://lore.kernel.org/linux-mtd/20200114090952.11232-1-miquel.raynal@bootlin.com
1195 lines
25 KiB
C
1195 lines
25 KiB
C
// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright © 1999-2010 David Woodhouse <dwmw2@infradead.org>
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*/
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/mm.h>
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#include <linux/err.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/slab.h>
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#include <linux/sched.h>
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#include <linux/mutex.h>
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#include <linux/backing-dev.h>
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#include <linux/compat.h>
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#include <linux/mount.h>
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#include <linux/blkpg.h>
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#include <linux/magic.h>
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#include <linux/major.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/mtd/map.h>
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#include <linux/uaccess.h>
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#include "mtdcore.h"
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static DEFINE_MUTEX(mtd_mutex);
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/*
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* Data structure to hold the pointer to the mtd device as well
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* as mode information of various use cases.
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*/
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struct mtd_file_info {
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struct mtd_info *mtd;
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enum mtd_file_modes mode;
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};
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static loff_t mtdchar_lseek(struct file *file, loff_t offset, int orig)
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{
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struct mtd_file_info *mfi = file->private_data;
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return fixed_size_llseek(file, offset, orig, mfi->mtd->size);
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}
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static int mtdchar_open(struct inode *inode, struct file *file)
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{
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int minor = iminor(inode);
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int devnum = minor >> 1;
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int ret = 0;
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struct mtd_info *mtd;
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struct mtd_file_info *mfi;
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pr_debug("MTD_open\n");
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/* You can't open the RO devices RW */
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if ((file->f_mode & FMODE_WRITE) && (minor & 1))
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return -EACCES;
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mutex_lock(&mtd_mutex);
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mtd = get_mtd_device(NULL, devnum);
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if (IS_ERR(mtd)) {
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ret = PTR_ERR(mtd);
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goto out;
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}
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if (mtd->type == MTD_ABSENT) {
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ret = -ENODEV;
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goto out1;
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}
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/* You can't open it RW if it's not a writeable device */
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if ((file->f_mode & FMODE_WRITE) && !(mtd->flags & MTD_WRITEABLE)) {
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ret = -EACCES;
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goto out1;
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}
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mfi = kzalloc(sizeof(*mfi), GFP_KERNEL);
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if (!mfi) {
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ret = -ENOMEM;
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goto out1;
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}
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mfi->mtd = mtd;
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file->private_data = mfi;
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mutex_unlock(&mtd_mutex);
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return 0;
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out1:
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put_mtd_device(mtd);
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out:
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mutex_unlock(&mtd_mutex);
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return ret;
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} /* mtdchar_open */
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/*====================================================================*/
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static int mtdchar_close(struct inode *inode, struct file *file)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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pr_debug("MTD_close\n");
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/* Only sync if opened RW */
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if ((file->f_mode & FMODE_WRITE))
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mtd_sync(mtd);
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put_mtd_device(mtd);
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file->private_data = NULL;
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kfree(mfi);
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return 0;
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} /* mtdchar_close */
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/* Back in June 2001, dwmw2 wrote:
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*
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* FIXME: This _really_ needs to die. In 2.5, we should lock the
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* userspace buffer down and use it directly with readv/writev.
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*
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* The implementation below, using mtd_kmalloc_up_to, mitigates
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* allocation failures when the system is under low-memory situations
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* or if memory is highly fragmented at the cost of reducing the
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* performance of the requested transfer due to a smaller buffer size.
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*
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* A more complex but more memory-efficient implementation based on
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* get_user_pages and iovecs to cover extents of those pages is a
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* longer-term goal, as intimated by dwmw2 above. However, for the
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* write case, this requires yet more complex head and tail transfer
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* handling when those head and tail offsets and sizes are such that
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* alignment requirements are not met in the NAND subdriver.
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*/
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static ssize_t mtdchar_read(struct file *file, char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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size_t retlen;
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size_t total_retlen=0;
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int ret=0;
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int len;
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size_t size = count;
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char *kbuf;
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pr_debug("MTD_read\n");
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if (*ppos + count > mtd->size) {
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if (*ppos < mtd->size)
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count = mtd->size - *ppos;
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else
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count = 0;
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}
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if (!count)
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return 0;
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kbuf = mtd_kmalloc_up_to(mtd, &size);
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if (!kbuf)
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return -ENOMEM;
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while (count) {
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len = min_t(size_t, count, size);
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switch (mfi->mode) {
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case MTD_FILE_MODE_OTP_FACTORY:
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ret = mtd_read_fact_prot_reg(mtd, *ppos, len,
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&retlen, kbuf);
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break;
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case MTD_FILE_MODE_OTP_USER:
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ret = mtd_read_user_prot_reg(mtd, *ppos, len,
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&retlen, kbuf);
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break;
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case MTD_FILE_MODE_RAW:
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{
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struct mtd_oob_ops ops = {};
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ops.mode = MTD_OPS_RAW;
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ops.datbuf = kbuf;
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ops.oobbuf = NULL;
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ops.len = len;
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ret = mtd_read_oob(mtd, *ppos, &ops);
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retlen = ops.retlen;
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break;
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}
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default:
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ret = mtd_read(mtd, *ppos, len, &retlen, kbuf);
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}
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/* Nand returns -EBADMSG on ECC errors, but it returns
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* the data. For our userspace tools it is important
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* to dump areas with ECC errors!
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* For kernel internal usage it also might return -EUCLEAN
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* to signal the caller that a bitflip has occurred and has
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* been corrected by the ECC algorithm.
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* Userspace software which accesses NAND this way
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* must be aware of the fact that it deals with NAND
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*/
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if (!ret || mtd_is_bitflip_or_eccerr(ret)) {
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*ppos += retlen;
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if (copy_to_user(buf, kbuf, retlen)) {
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kfree(kbuf);
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return -EFAULT;
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}
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else
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total_retlen += retlen;
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count -= retlen;
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buf += retlen;
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if (retlen == 0)
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count = 0;
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}
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else {
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kfree(kbuf);
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return ret;
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}
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}
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kfree(kbuf);
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return total_retlen;
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} /* mtdchar_read */
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static ssize_t mtdchar_write(struct file *file, const char __user *buf, size_t count,
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loff_t *ppos)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_info *mtd = mfi->mtd;
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size_t size = count;
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char *kbuf;
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size_t retlen;
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size_t total_retlen=0;
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int ret=0;
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int len;
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pr_debug("MTD_write\n");
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if (*ppos >= mtd->size)
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return -ENOSPC;
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if (*ppos + count > mtd->size)
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count = mtd->size - *ppos;
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if (!count)
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return 0;
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kbuf = mtd_kmalloc_up_to(mtd, &size);
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if (!kbuf)
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return -ENOMEM;
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while (count) {
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len = min_t(size_t, count, size);
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if (copy_from_user(kbuf, buf, len)) {
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kfree(kbuf);
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return -EFAULT;
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}
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switch (mfi->mode) {
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case MTD_FILE_MODE_OTP_FACTORY:
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ret = -EROFS;
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break;
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case MTD_FILE_MODE_OTP_USER:
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ret = mtd_write_user_prot_reg(mtd, *ppos, len,
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&retlen, kbuf);
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break;
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case MTD_FILE_MODE_RAW:
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{
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struct mtd_oob_ops ops = {};
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ops.mode = MTD_OPS_RAW;
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ops.datbuf = kbuf;
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ops.oobbuf = NULL;
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ops.ooboffs = 0;
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ops.len = len;
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ret = mtd_write_oob(mtd, *ppos, &ops);
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retlen = ops.retlen;
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break;
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}
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default:
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ret = mtd_write(mtd, *ppos, len, &retlen, kbuf);
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}
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/*
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* Return -ENOSPC only if no data could be written at all.
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* Otherwise just return the number of bytes that actually
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* have been written.
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*/
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if ((ret == -ENOSPC) && (total_retlen))
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break;
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if (!ret) {
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*ppos += retlen;
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total_retlen += retlen;
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count -= retlen;
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buf += retlen;
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}
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else {
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kfree(kbuf);
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return ret;
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}
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}
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kfree(kbuf);
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return total_retlen;
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} /* mtdchar_write */
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/*======================================================================
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IOCTL calls for getting device parameters.
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======================================================================*/
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static int otp_select_filemode(struct mtd_file_info *mfi, int mode)
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{
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struct mtd_info *mtd = mfi->mtd;
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size_t retlen;
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switch (mode) {
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case MTD_OTP_FACTORY:
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if (mtd_read_fact_prot_reg(mtd, -1, 0, &retlen, NULL) ==
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-EOPNOTSUPP)
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return -EOPNOTSUPP;
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mfi->mode = MTD_FILE_MODE_OTP_FACTORY;
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break;
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case MTD_OTP_USER:
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if (mtd_read_user_prot_reg(mtd, -1, 0, &retlen, NULL) ==
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-EOPNOTSUPP)
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return -EOPNOTSUPP;
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mfi->mode = MTD_FILE_MODE_OTP_USER;
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break;
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case MTD_OTP_OFF:
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mfi->mode = MTD_FILE_MODE_NORMAL;
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break;
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default:
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return -EINVAL;
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}
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return 0;
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}
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static int mtdchar_writeoob(struct file *file, struct mtd_info *mtd,
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uint64_t start, uint32_t length, void __user *ptr,
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uint32_t __user *retp)
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{
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struct mtd_info *master = mtd_get_master(mtd);
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_oob_ops ops = {};
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uint32_t retlen;
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int ret = 0;
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if (!(file->f_mode & FMODE_WRITE))
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return -EPERM;
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if (length > 4096)
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return -EINVAL;
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if (!master->_write_oob)
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return -EOPNOTSUPP;
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ops.ooblen = length;
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ops.ooboffs = start & (mtd->writesize - 1);
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ops.datbuf = NULL;
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ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
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MTD_OPS_PLACE_OOB;
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if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
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return -EINVAL;
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ops.oobbuf = memdup_user(ptr, length);
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if (IS_ERR(ops.oobbuf))
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return PTR_ERR(ops.oobbuf);
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start &= ~((uint64_t)mtd->writesize - 1);
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ret = mtd_write_oob(mtd, start, &ops);
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if (ops.oobretlen > 0xFFFFFFFFU)
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ret = -EOVERFLOW;
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retlen = ops.oobretlen;
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if (copy_to_user(retp, &retlen, sizeof(length)))
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ret = -EFAULT;
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kfree(ops.oobbuf);
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return ret;
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}
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static int mtdchar_readoob(struct file *file, struct mtd_info *mtd,
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uint64_t start, uint32_t length, void __user *ptr,
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uint32_t __user *retp)
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{
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struct mtd_file_info *mfi = file->private_data;
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struct mtd_oob_ops ops = {};
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int ret = 0;
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if (length > 4096)
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return -EINVAL;
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ops.ooblen = length;
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ops.ooboffs = start & (mtd->writesize - 1);
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ops.datbuf = NULL;
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ops.mode = (mfi->mode == MTD_FILE_MODE_RAW) ? MTD_OPS_RAW :
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MTD_OPS_PLACE_OOB;
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if (ops.ooboffs && ops.ooblen > (mtd->oobsize - ops.ooboffs))
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return -EINVAL;
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ops.oobbuf = kmalloc(length, GFP_KERNEL);
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if (!ops.oobbuf)
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return -ENOMEM;
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start &= ~((uint64_t)mtd->writesize - 1);
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ret = mtd_read_oob(mtd, start, &ops);
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if (put_user(ops.oobretlen, retp))
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ret = -EFAULT;
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else if (ops.oobretlen && copy_to_user(ptr, ops.oobbuf,
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ops.oobretlen))
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ret = -EFAULT;
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kfree(ops.oobbuf);
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/*
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* NAND returns -EBADMSG on ECC errors, but it returns the OOB
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* data. For our userspace tools it is important to dump areas
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* with ECC errors!
|
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* For kernel internal usage it also might return -EUCLEAN
|
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* to signal the caller that a bitflip has occurred and has
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* been corrected by the ECC algorithm.
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*
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* Note: currently the standard NAND function, nand_read_oob_std,
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* does not calculate ECC for the OOB area, so do not rely on
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* this behavior unless you have replaced it with your own.
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*/
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if (mtd_is_bitflip_or_eccerr(ret))
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return 0;
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return ret;
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}
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/*
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* Copies (and truncates, if necessary) OOB layout information to the
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* deprecated layout struct, nand_ecclayout_user. This is necessary only to
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* support the deprecated API ioctl ECCGETLAYOUT while allowing all new
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* functionality to use mtd_ooblayout_ops flexibly (i.e. mtd_ooblayout_ops
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* can describe any kind of OOB layout with almost zero overhead from a
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* memory usage point of view).
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*/
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static int shrink_ecclayout(struct mtd_info *mtd,
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struct nand_ecclayout_user *to)
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{
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struct mtd_oob_region oobregion;
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int i, section = 0, ret;
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if (!mtd || !to)
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return -EINVAL;
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memset(to, 0, sizeof(*to));
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to->eccbytes = 0;
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for (i = 0; i < MTD_MAX_ECCPOS_ENTRIES;) {
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u32 eccpos;
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ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
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if (ret < 0) {
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if (ret != -ERANGE)
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return ret;
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break;
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}
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eccpos = oobregion.offset;
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for (; i < MTD_MAX_ECCPOS_ENTRIES &&
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eccpos < oobregion.offset + oobregion.length; i++) {
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to->eccpos[i] = eccpos++;
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to->eccbytes++;
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}
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}
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for (i = 0; i < MTD_MAX_OOBFREE_ENTRIES; i++) {
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ret = mtd_ooblayout_free(mtd, i, &oobregion);
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if (ret < 0) {
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if (ret != -ERANGE)
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return ret;
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break;
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}
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to->oobfree[i].offset = oobregion.offset;
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to->oobfree[i].length = oobregion.length;
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to->oobavail += to->oobfree[i].length;
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}
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return 0;
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}
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static int get_oobinfo(struct mtd_info *mtd, struct nand_oobinfo *to)
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{
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struct mtd_oob_region oobregion;
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int i, section = 0, ret;
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if (!mtd || !to)
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return -EINVAL;
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memset(to, 0, sizeof(*to));
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to->eccbytes = 0;
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for (i = 0; i < ARRAY_SIZE(to->eccpos);) {
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u32 eccpos;
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|
|
ret = mtd_ooblayout_ecc(mtd, section++, &oobregion);
|
|
if (ret < 0) {
|
|
if (ret != -ERANGE)
|
|
return ret;
|
|
|
|
break;
|
|
}
|
|
|
|
if (oobregion.length + i > ARRAY_SIZE(to->eccpos))
|
|
return -EINVAL;
|
|
|
|
eccpos = oobregion.offset;
|
|
for (; eccpos < oobregion.offset + oobregion.length; i++) {
|
|
to->eccpos[i] = eccpos++;
|
|
to->eccbytes++;
|
|
}
|
|
}
|
|
|
|
for (i = 0; i < 8; i++) {
|
|
ret = mtd_ooblayout_free(mtd, i, &oobregion);
|
|
if (ret < 0) {
|
|
if (ret != -ERANGE)
|
|
return ret;
|
|
|
|
break;
|
|
}
|
|
|
|
to->oobfree[i][0] = oobregion.offset;
|
|
to->oobfree[i][1] = oobregion.length;
|
|
}
|
|
|
|
to->useecc = MTD_NANDECC_AUTOPLACE;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int mtdchar_blkpg_ioctl(struct mtd_info *mtd,
|
|
struct blkpg_ioctl_arg *arg)
|
|
{
|
|
struct blkpg_partition p;
|
|
|
|
if (!capable(CAP_SYS_ADMIN))
|
|
return -EPERM;
|
|
|
|
if (copy_from_user(&p, arg->data, sizeof(p)))
|
|
return -EFAULT;
|
|
|
|
switch (arg->op) {
|
|
case BLKPG_ADD_PARTITION:
|
|
|
|
/* Only master mtd device must be used to add partitions */
|
|
if (mtd_is_partition(mtd))
|
|
return -EINVAL;
|
|
|
|
/* Sanitize user input */
|
|
p.devname[BLKPG_DEVNAMELTH - 1] = '\0';
|
|
|
|
return mtd_add_partition(mtd, p.devname, p.start, p.length);
|
|
|
|
case BLKPG_DEL_PARTITION:
|
|
|
|
if (p.pno < 0)
|
|
return -EINVAL;
|
|
|
|
return mtd_del_partition(mtd, p.pno);
|
|
|
|
default:
|
|
return -EINVAL;
|
|
}
|
|
}
|
|
|
|
static int mtdchar_write_ioctl(struct mtd_info *mtd,
|
|
struct mtd_write_req __user *argp)
|
|
{
|
|
struct mtd_info *master = mtd_get_master(mtd);
|
|
struct mtd_write_req req;
|
|
struct mtd_oob_ops ops = {};
|
|
const void __user *usr_data, *usr_oob;
|
|
int ret;
|
|
|
|
if (copy_from_user(&req, argp, sizeof(req)))
|
|
return -EFAULT;
|
|
|
|
usr_data = (const void __user *)(uintptr_t)req.usr_data;
|
|
usr_oob = (const void __user *)(uintptr_t)req.usr_oob;
|
|
|
|
if (!master->_write_oob)
|
|
return -EOPNOTSUPP;
|
|
ops.mode = req.mode;
|
|
ops.len = (size_t)req.len;
|
|
ops.ooblen = (size_t)req.ooblen;
|
|
ops.ooboffs = 0;
|
|
|
|
if (usr_data) {
|
|
ops.datbuf = memdup_user(usr_data, ops.len);
|
|
if (IS_ERR(ops.datbuf))
|
|
return PTR_ERR(ops.datbuf);
|
|
} else {
|
|
ops.datbuf = NULL;
|
|
}
|
|
|
|
if (usr_oob) {
|
|
ops.oobbuf = memdup_user(usr_oob, ops.ooblen);
|
|
if (IS_ERR(ops.oobbuf)) {
|
|
kfree(ops.datbuf);
|
|
return PTR_ERR(ops.oobbuf);
|
|
}
|
|
} else {
|
|
ops.oobbuf = NULL;
|
|
}
|
|
|
|
ret = mtd_write_oob(mtd, (loff_t)req.start, &ops);
|
|
|
|
kfree(ops.datbuf);
|
|
kfree(ops.oobbuf);
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int mtdchar_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
struct mtd_info *master = mtd_get_master(mtd);
|
|
void __user *argp = (void __user *)arg;
|
|
int ret = 0;
|
|
struct mtd_info_user info;
|
|
|
|
pr_debug("MTD_ioctl\n");
|
|
|
|
switch (cmd) {
|
|
case MEMGETREGIONCOUNT:
|
|
if (copy_to_user(argp, &(mtd->numeraseregions), sizeof(int)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMGETREGIONINFO:
|
|
{
|
|
uint32_t ur_idx;
|
|
struct mtd_erase_region_info *kr;
|
|
struct region_info_user __user *ur = argp;
|
|
|
|
if (get_user(ur_idx, &(ur->regionindex)))
|
|
return -EFAULT;
|
|
|
|
if (ur_idx >= mtd->numeraseregions)
|
|
return -EINVAL;
|
|
|
|
kr = &(mtd->eraseregions[ur_idx]);
|
|
|
|
if (put_user(kr->offset, &(ur->offset))
|
|
|| put_user(kr->erasesize, &(ur->erasesize))
|
|
|| put_user(kr->numblocks, &(ur->numblocks)))
|
|
return -EFAULT;
|
|
|
|
break;
|
|
}
|
|
|
|
case MEMGETINFO:
|
|
memset(&info, 0, sizeof(info));
|
|
info.type = mtd->type;
|
|
info.flags = mtd->flags;
|
|
info.size = mtd->size;
|
|
info.erasesize = mtd->erasesize;
|
|
info.writesize = mtd->writesize;
|
|
info.oobsize = mtd->oobsize;
|
|
/* The below field is obsolete */
|
|
info.padding = 0;
|
|
if (copy_to_user(argp, &info, sizeof(struct mtd_info_user)))
|
|
return -EFAULT;
|
|
break;
|
|
|
|
case MEMERASE:
|
|
case MEMERASE64:
|
|
{
|
|
struct erase_info *erase;
|
|
|
|
if(!(file->f_mode & FMODE_WRITE))
|
|
return -EPERM;
|
|
|
|
erase=kzalloc(sizeof(struct erase_info),GFP_KERNEL);
|
|
if (!erase)
|
|
ret = -ENOMEM;
|
|
else {
|
|
if (cmd == MEMERASE64) {
|
|
struct erase_info_user64 einfo64;
|
|
|
|
if (copy_from_user(&einfo64, argp,
|
|
sizeof(struct erase_info_user64))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo64.start;
|
|
erase->len = einfo64.length;
|
|
} else {
|
|
struct erase_info_user einfo32;
|
|
|
|
if (copy_from_user(&einfo32, argp,
|
|
sizeof(struct erase_info_user))) {
|
|
kfree(erase);
|
|
return -EFAULT;
|
|
}
|
|
erase->addr = einfo32.start;
|
|
erase->len = einfo32.length;
|
|
}
|
|
|
|
ret = mtd_erase(mtd, erase);
|
|
kfree(erase);
|
|
}
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->length */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB:
|
|
{
|
|
struct mtd_oob_buf buf;
|
|
struct mtd_oob_buf __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf_user->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
|
buf.ptr, &buf_user->start);
|
|
break;
|
|
}
|
|
|
|
case MEMWRITEOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB64:
|
|
{
|
|
struct mtd_oob_buf64 buf;
|
|
struct mtd_oob_buf64 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start, buf.length,
|
|
(void __user *)(uintptr_t)buf.usr_ptr,
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMWRITE:
|
|
{
|
|
ret = mtdchar_write_ioctl(mtd,
|
|
(struct mtd_write_req __user *)arg);
|
|
break;
|
|
}
|
|
|
|
case MEMLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_lock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMUNLOCK:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_unlock(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
case MEMISLOCKED:
|
|
{
|
|
struct erase_info_user einfo;
|
|
|
|
if (copy_from_user(&einfo, argp, sizeof(einfo)))
|
|
return -EFAULT;
|
|
|
|
ret = mtd_is_locked(mtd, einfo.start, einfo.length);
|
|
break;
|
|
}
|
|
|
|
/* Legacy interface */
|
|
case MEMGETOOBSEL:
|
|
{
|
|
struct nand_oobinfo oi;
|
|
|
|
if (!master->ooblayout)
|
|
return -EOPNOTSUPP;
|
|
|
|
ret = get_oobinfo(mtd, &oi);
|
|
if (ret)
|
|
return ret;
|
|
|
|
if (copy_to_user(argp, &oi, sizeof(struct nand_oobinfo)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MEMGETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
return mtd_block_isbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
case MEMSETBADBLOCK:
|
|
{
|
|
loff_t offs;
|
|
|
|
if (copy_from_user(&offs, argp, sizeof(loff_t)))
|
|
return -EFAULT;
|
|
return mtd_block_markbad(mtd, offs);
|
|
break;
|
|
}
|
|
|
|
case OTPSELECT:
|
|
{
|
|
int mode;
|
|
if (copy_from_user(&mode, argp, sizeof(int)))
|
|
return -EFAULT;
|
|
|
|
mfi->mode = MTD_FILE_MODE_NORMAL;
|
|
|
|
ret = otp_select_filemode(mfi, mode);
|
|
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
case OTPGETREGIONCOUNT:
|
|
case OTPGETREGIONINFO:
|
|
{
|
|
struct otp_info *buf = kmalloc(4096, GFP_KERNEL);
|
|
size_t retlen;
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
switch (mfi->mode) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
ret = mtd_get_fact_prot_info(mtd, 4096, &retlen, buf);
|
|
break;
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = mtd_get_user_prot_info(mtd, 4096, &retlen, buf);
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
break;
|
|
}
|
|
if (!ret) {
|
|
if (cmd == OTPGETREGIONCOUNT) {
|
|
int nbr = retlen / sizeof(struct otp_info);
|
|
ret = copy_to_user(argp, &nbr, sizeof(int));
|
|
} else
|
|
ret = copy_to_user(argp, buf, retlen);
|
|
if (ret)
|
|
ret = -EFAULT;
|
|
}
|
|
kfree(buf);
|
|
break;
|
|
}
|
|
|
|
case OTPLOCK:
|
|
{
|
|
struct otp_info oinfo;
|
|
|
|
if (mfi->mode != MTD_FILE_MODE_OTP_USER)
|
|
return -EINVAL;
|
|
if (copy_from_user(&oinfo, argp, sizeof(oinfo)))
|
|
return -EFAULT;
|
|
ret = mtd_lock_user_prot_reg(mtd, oinfo.start, oinfo.length);
|
|
break;
|
|
}
|
|
|
|
/* This ioctl is being deprecated - it truncates the ECC layout */
|
|
case ECCGETLAYOUT:
|
|
{
|
|
struct nand_ecclayout_user *usrlay;
|
|
|
|
if (!master->ooblayout)
|
|
return -EOPNOTSUPP;
|
|
|
|
usrlay = kmalloc(sizeof(*usrlay), GFP_KERNEL);
|
|
if (!usrlay)
|
|
return -ENOMEM;
|
|
|
|
shrink_ecclayout(mtd, usrlay);
|
|
|
|
if (copy_to_user(argp, usrlay, sizeof(*usrlay)))
|
|
ret = -EFAULT;
|
|
kfree(usrlay);
|
|
break;
|
|
}
|
|
|
|
case ECCGETSTATS:
|
|
{
|
|
if (copy_to_user(argp, &mtd->ecc_stats,
|
|
sizeof(struct mtd_ecc_stats)))
|
|
return -EFAULT;
|
|
break;
|
|
}
|
|
|
|
case MTDFILEMODE:
|
|
{
|
|
mfi->mode = 0;
|
|
|
|
switch(arg) {
|
|
case MTD_FILE_MODE_OTP_FACTORY:
|
|
case MTD_FILE_MODE_OTP_USER:
|
|
ret = otp_select_filemode(mfi, arg);
|
|
break;
|
|
|
|
case MTD_FILE_MODE_RAW:
|
|
if (!mtd_has_oob(mtd))
|
|
return -EOPNOTSUPP;
|
|
mfi->mode = arg;
|
|
|
|
case MTD_FILE_MODE_NORMAL:
|
|
break;
|
|
default:
|
|
ret = -EINVAL;
|
|
}
|
|
file->f_pos = 0;
|
|
break;
|
|
}
|
|
|
|
case BLKPG:
|
|
{
|
|
struct blkpg_ioctl_arg __user *blk_arg = argp;
|
|
struct blkpg_ioctl_arg a;
|
|
|
|
if (copy_from_user(&a, blk_arg, sizeof(a)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_blkpg_ioctl(mtd, &a);
|
|
break;
|
|
}
|
|
|
|
case BLKRRPART:
|
|
{
|
|
/* No reread partition feature. Just return ok */
|
|
ret = 0;
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ret = -ENOTTY;
|
|
}
|
|
|
|
return ret;
|
|
} /* memory_ioctl */
|
|
|
|
static long mtdchar_unlocked_ioctl(struct file *file, u_int cmd, u_long arg)
|
|
{
|
|
int ret;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
ret = mtdchar_ioctl(file, cmd, arg);
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_COMPAT
|
|
|
|
struct mtd_oob_buf32 {
|
|
u_int32_t start;
|
|
u_int32_t length;
|
|
compat_caddr_t ptr; /* unsigned char* */
|
|
};
|
|
|
|
#define MEMWRITEOOB32 _IOWR('M', 3, struct mtd_oob_buf32)
|
|
#define MEMREADOOB32 _IOWR('M', 4, struct mtd_oob_buf32)
|
|
|
|
static long mtdchar_compat_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
void __user *argp = compat_ptr(arg);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&mtd_mutex);
|
|
|
|
switch (cmd) {
|
|
case MEMWRITEOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_writeoob(file, mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->length);
|
|
break;
|
|
}
|
|
|
|
case MEMREADOOB32:
|
|
{
|
|
struct mtd_oob_buf32 buf;
|
|
struct mtd_oob_buf32 __user *buf_user = argp;
|
|
|
|
/* NOTE: writes return length to buf->start */
|
|
if (copy_from_user(&buf, argp, sizeof(buf)))
|
|
ret = -EFAULT;
|
|
else
|
|
ret = mtdchar_readoob(file, mtd, buf.start,
|
|
buf.length, compat_ptr(buf.ptr),
|
|
&buf_user->start);
|
|
break;
|
|
}
|
|
|
|
case BLKPG:
|
|
{
|
|
/* Convert from blkpg_compat_ioctl_arg to blkpg_ioctl_arg */
|
|
struct blkpg_compat_ioctl_arg __user *uarg = argp;
|
|
struct blkpg_compat_ioctl_arg compat_arg;
|
|
struct blkpg_ioctl_arg a;
|
|
|
|
if (copy_from_user(&compat_arg, uarg, sizeof(compat_arg))) {
|
|
ret = -EFAULT;
|
|
break;
|
|
}
|
|
|
|
memset(&a, 0, sizeof(a));
|
|
a.op = compat_arg.op;
|
|
a.flags = compat_arg.flags;
|
|
a.datalen = compat_arg.datalen;
|
|
a.data = compat_ptr(compat_arg.data);
|
|
|
|
ret = mtdchar_blkpg_ioctl(mtd, &a);
|
|
break;
|
|
}
|
|
|
|
default:
|
|
ret = mtdchar_ioctl(file, cmd, (unsigned long)argp);
|
|
}
|
|
|
|
mutex_unlock(&mtd_mutex);
|
|
|
|
return ret;
|
|
}
|
|
|
|
#endif /* CONFIG_COMPAT */
|
|
|
|
/*
|
|
* try to determine where a shared mapping can be made
|
|
* - only supported for NOMMU at the moment (MMU can't doesn't copy private
|
|
* mappings)
|
|
*/
|
|
#ifndef CONFIG_MMU
|
|
static unsigned long mtdchar_get_unmapped_area(struct file *file,
|
|
unsigned long addr,
|
|
unsigned long len,
|
|
unsigned long pgoff,
|
|
unsigned long flags)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
unsigned long offset;
|
|
int ret;
|
|
|
|
if (addr != 0)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
if (len > mtd->size || pgoff >= (mtd->size >> PAGE_SHIFT))
|
|
return (unsigned long) -EINVAL;
|
|
|
|
offset = pgoff << PAGE_SHIFT;
|
|
if (offset > mtd->size - len)
|
|
return (unsigned long) -EINVAL;
|
|
|
|
ret = mtd_get_unmapped_area(mtd, len, offset, flags);
|
|
return ret == -EOPNOTSUPP ? -ENODEV : ret;
|
|
}
|
|
|
|
static unsigned mtdchar_mmap_capabilities(struct file *file)
|
|
{
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
|
|
return mtd_mmap_capabilities(mfi->mtd);
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
* set up a mapping for shared memory segments
|
|
*/
|
|
static int mtdchar_mmap(struct file *file, struct vm_area_struct *vma)
|
|
{
|
|
#ifdef CONFIG_MMU
|
|
struct mtd_file_info *mfi = file->private_data;
|
|
struct mtd_info *mtd = mfi->mtd;
|
|
struct map_info *map = mtd->priv;
|
|
|
|
/* This is broken because it assumes the MTD device is map-based
|
|
and that mtd->priv is a valid struct map_info. It should be
|
|
replaced with something that uses the mtd_get_unmapped_area()
|
|
operation properly. */
|
|
if (0 /*mtd->type == MTD_RAM || mtd->type == MTD_ROM*/) {
|
|
#ifdef pgprot_noncached
|
|
if (file->f_flags & O_DSYNC || map->phys >= __pa(high_memory))
|
|
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
|
|
#endif
|
|
return vm_iomap_memory(vma, map->phys, map->size);
|
|
}
|
|
return -ENODEV;
|
|
#else
|
|
return vma->vm_flags & VM_SHARED ? 0 : -EACCES;
|
|
#endif
|
|
}
|
|
|
|
static const struct file_operations mtd_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = mtdchar_lseek,
|
|
.read = mtdchar_read,
|
|
.write = mtdchar_write,
|
|
.unlocked_ioctl = mtdchar_unlocked_ioctl,
|
|
#ifdef CONFIG_COMPAT
|
|
.compat_ioctl = mtdchar_compat_ioctl,
|
|
#endif
|
|
.open = mtdchar_open,
|
|
.release = mtdchar_close,
|
|
.mmap = mtdchar_mmap,
|
|
#ifndef CONFIG_MMU
|
|
.get_unmapped_area = mtdchar_get_unmapped_area,
|
|
.mmap_capabilities = mtdchar_mmap_capabilities,
|
|
#endif
|
|
};
|
|
|
|
int __init init_mtdchar(void)
|
|
{
|
|
int ret;
|
|
|
|
ret = __register_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS,
|
|
"mtd", &mtd_fops);
|
|
if (ret < 0) {
|
|
pr_err("Can't allocate major number %d for MTD\n",
|
|
MTD_CHAR_MAJOR);
|
|
return ret;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
void __exit cleanup_mtdchar(void)
|
|
{
|
|
__unregister_chrdev(MTD_CHAR_MAJOR, 0, 1 << MINORBITS, "mtd");
|
|
}
|
|
|
|
MODULE_ALIAS_CHARDEV_MAJOR(MTD_CHAR_MAJOR);
|