mirror of
https://github.com/AsahiLinux/u-boot
synced 2024-11-27 07:01:24 +00:00
145 lines
3.9 KiB
C
145 lines
3.9 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* Copyright (c) International Business Machines Corp., 2006
|
|
*
|
|
* Author: Artem Bityutskiy (Битюцкий Артём)
|
|
*/
|
|
|
|
/* Here we keep miscellaneous functions which are used all over the UBI code */
|
|
|
|
#include <log.h>
|
|
#include <malloc.h>
|
|
#include <ubi_uboot.h>
|
|
#include "ubi.h"
|
|
|
|
/**
|
|
* calc_data_len - calculate how much real data is stored in a buffer.
|
|
* @ubi: UBI device description object
|
|
* @buf: a buffer with the contents of the physical eraseblock
|
|
* @length: the buffer length
|
|
*
|
|
* This function calculates how much "real data" is stored in @buf and returnes
|
|
* the length. Continuous 0xFF bytes at the end of the buffer are not
|
|
* considered as "real data".
|
|
*/
|
|
int ubi_calc_data_len(const struct ubi_device *ubi, const void *buf,
|
|
int length)
|
|
{
|
|
int i;
|
|
|
|
ubi_assert(!(length & (ubi->min_io_size - 1)));
|
|
|
|
for (i = length - 1; i >= 0; i--)
|
|
if (((const uint8_t *)buf)[i] != 0xFF)
|
|
break;
|
|
|
|
/* The resulting length must be aligned to the minimum flash I/O size */
|
|
length = ALIGN(i + 1, ubi->min_io_size);
|
|
return length;
|
|
}
|
|
|
|
/**
|
|
* ubi_check_volume - check the contents of a static volume.
|
|
* @ubi: UBI device description object
|
|
* @vol_id: ID of the volume to check
|
|
*
|
|
* This function checks if static volume @vol_id is corrupted by fully reading
|
|
* it and checking data CRC. This function returns %0 if the volume is not
|
|
* corrupted, %1 if it is corrupted and a negative error code in case of
|
|
* failure. Dynamic volumes are not checked and zero is returned immediately.
|
|
*/
|
|
int ubi_check_volume(struct ubi_device *ubi, int vol_id)
|
|
{
|
|
void *buf;
|
|
int err = 0, i;
|
|
struct ubi_volume *vol = ubi->volumes[vol_id];
|
|
|
|
if (vol->vol_type != UBI_STATIC_VOLUME)
|
|
return 0;
|
|
|
|
buf = vmalloc(vol->usable_leb_size);
|
|
if (!buf)
|
|
return -ENOMEM;
|
|
|
|
for (i = 0; i < vol->used_ebs; i++) {
|
|
int size;
|
|
|
|
cond_resched();
|
|
|
|
if (i == vol->used_ebs - 1)
|
|
size = vol->last_eb_bytes;
|
|
else
|
|
size = vol->usable_leb_size;
|
|
|
|
err = ubi_eba_read_leb(ubi, vol, i, buf, 0, size, 1);
|
|
if (err) {
|
|
if (mtd_is_eccerr(err))
|
|
err = 1;
|
|
break;
|
|
}
|
|
}
|
|
|
|
vfree(buf);
|
|
return err;
|
|
}
|
|
|
|
/**
|
|
* ubi_update_reserved - update bad eraseblock handling accounting data.
|
|
* @ubi: UBI device description object
|
|
*
|
|
* This function calculates the gap between current number of PEBs reserved for
|
|
* bad eraseblock handling and the required level of PEBs that must be
|
|
* reserved, and if necessary, reserves more PEBs to fill that gap, according
|
|
* to availability. Should be called with ubi->volumes_lock held.
|
|
*/
|
|
void ubi_update_reserved(struct ubi_device *ubi)
|
|
{
|
|
int need = ubi->beb_rsvd_level - ubi->beb_rsvd_pebs;
|
|
|
|
if (need <= 0 || ubi->avail_pebs == 0)
|
|
return;
|
|
|
|
need = min_t(int, need, ubi->avail_pebs);
|
|
ubi->avail_pebs -= need;
|
|
ubi->rsvd_pebs += need;
|
|
ubi->beb_rsvd_pebs += need;
|
|
ubi_msg(ubi, "reserved more %d PEBs for bad PEB handling", need);
|
|
}
|
|
|
|
/**
|
|
* ubi_calculate_reserved - calculate how many PEBs must be reserved for bad
|
|
* eraseblock handling.
|
|
* @ubi: UBI device description object
|
|
*/
|
|
void ubi_calculate_reserved(struct ubi_device *ubi)
|
|
{
|
|
/*
|
|
* Calculate the actual number of PEBs currently needed to be reserved
|
|
* for future bad eraseblock handling.
|
|
*/
|
|
ubi->beb_rsvd_level = ubi->bad_peb_limit - ubi->bad_peb_count;
|
|
if (ubi->beb_rsvd_level < 0) {
|
|
ubi->beb_rsvd_level = 0;
|
|
ubi_warn(ubi, "number of bad PEBs (%d) is above the expected limit (%d), not reserving any PEBs for bad PEB handling, will use available PEBs (if any)",
|
|
ubi->bad_peb_count, ubi->bad_peb_limit);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* ubi_check_pattern - check if buffer contains only a certain byte pattern.
|
|
* @buf: buffer to check
|
|
* @patt: the pattern to check
|
|
* @size: buffer size in bytes
|
|
*
|
|
* This function returns %1 in there are only @patt bytes in @buf, and %0 if
|
|
* something else was also found.
|
|
*/
|
|
int ubi_check_pattern(const void *buf, uint8_t patt, int size)
|
|
{
|
|
int i;
|
|
|
|
for (i = 0; i < size; i++)
|
|
if (((const uint8_t *)buf)[i] != patt)
|
|
return 0;
|
|
return 1;
|
|
}
|