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UBI: allow specifying bad PEBs limit using module parameter 

This patch provides the possibility to adjust the "maximum expected number of
bad blocks per 1024 blocks" (max_beb_per1024) for each mtd device.

The majority of NAND devices have their max_beb_per1024 equal to 20, but
sometimes it's more.
Now, we can adjust that via a kernel parameter:
ubi.mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]]

Signed-off-by: Richard Genoud <richard.genoud@gmail.com>
Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com>
This commit is contained in:
Richard Genoud 2012-08-20 18:00:14 +02:00 committed by Artem Bityutskiy
parent d2f588f934
commit edac493dfb
2 changed files with 27 additions and 15 deletions
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2
drivers/mtd/ubi/Kconfig
View File

@ -51,6 +51,8 @@ config MTD_UBI_BEB_LIMIT
MTD partitions of the same size, UBI will reserve 40 eraseblocks when
attaching a partition.
This option can be overridden by the "mtd=" UBI module parameter.
Leave the default value if unsure.
config MTD_UBI_GLUEBI

40
drivers/mtd/ubi/build.c
View File

@ -47,7 +47,7 @@
#define MTD_PARAM_LEN_MAX 64
/* Maximum number of comma-separated items in the 'mtd=' parameter */
#define MTD_PARAM_MAX_COUNT 2
#define MTD_PARAM_MAX_COUNT 3
/* Maximum value for the number of bad PEBs per 1024 PEBs */
#define MAX_MTD_UBI_BEB_LIMIT 768
@ -63,10 +63,12 @@
* @name: MTD character device node path, MTD device name, or MTD device number
* string
* @vid_hdr_offs: VID header offset
* @max_beb_per1024: maximum expected number of bad PEBs per 1024 PEBs
*/
struct mtd_dev_param {
char name[MTD_PARAM_LEN_MAX];
int vid_hdr_offs;
int max_beb_per1024;
};
/* Numbers of elements set in the @mtd_dev_param array */
@ -838,7 +840,7 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
* @mtd: MTD device description object
* @ubi_num: number to assign to the new UBI device
* @vid_hdr_offset: VID header offset
* @max_beb_per1024: maximum number of expected bad blocks per 1024 PEBs
* @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
*
* This function attaches MTD device @mtd_dev to UBI and assign @ubi_num number
* to the newly created UBI device, unless @ubi_num is %UBI_DEV_NUM_AUTO, in
@ -1218,8 +1220,7 @@ static int __init ubi_init(void)
mutex_lock(&ubi_devices_mutex);
err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO,
p->vid_hdr_offs,
CONFIG_MTD_UBI_BEB_LIMIT);
p->vid_hdr_offs, p->max_beb_per1024);
mutex_unlock(&ubi_devices_mutex);
if (err < 0) {
ubi_err("cannot attach mtd%d", mtd->index);
@ -1386,23 +1387,32 @@ static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
if (p->vid_hdr_offs < 0)
return p->vid_hdr_offs;
if (tokens[2]) {
int err = kstrtoint(tokens[2], 10, &p->max_beb_per1024);
if (err) {
printk(KERN_ERR "UBI error: bad value for "
"max_beb_per1024 parameter: %s", tokens[2]);
return -EINVAL;
}
}
mtd_devs += 1;
return 0;
}
module_param_call(mtd, ubi_mtd_param_parse, NULL, NULL, 000);
MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: "
"mtd=<name|num|path>[,<vid_hdr_offs>].\n"
MODULE_PARM_DESC(mtd, "MTD devices to attach. Parameter format: mtd=<name|num|path>[,<vid_hdr_offs>[,max_beb_per1024]].\n"
"Multiple \"mtd\" parameters may be specified.\n"
"MTD devices may be specified by their number, name, or "
"path to the MTD character device node.\n"
"Optional \"vid_hdr_offs\" parameter specifies UBI VID "
"header position to be used by UBI.\n"
"Example 1: mtd=/dev/mtd0 - attach MTD device "
"/dev/mtd0.\n"
"Example 2: mtd=content,1984 mtd=4 - attach MTD device "
"with name \"content\" using VID header offset 1984, and "
"MTD device number 4 with default VID header offset.");
"MTD devices may be specified by their number, name, or path to the MTD character device node.\n"
"Optional \"vid_hdr_offs\" parameter specifies UBI VID header position to be used by UBI. (default value if 0)\n"
"Optional \"max_beb_per1024\" parameter specifies the maximum expected bad eraseblock per 1024 eraseblocks. (default value ("
__stringify(CONFIG_MTD_UBI_BEB_LIMIT) ") if 0)\n"
"\n"
"Example 1: mtd=/dev/mtd0 - attach MTD device /dev/mtd0.\n"
"Example 2: mtd=content,1984 mtd=4 - attach MTD device with name \"content\" using VID header offset 1984, and MTD device number 4 with default VID header offset.\n"
"Example 3: mtd=/dev/mtd1,0,25 - attach MTD device /dev/mtd1 using default VID header offset and reserve 25*nand_size_in_blocks/1024 erase blocks for bad block handling.\n"
"\t(e.g. if the NAND *chipset* has 4096 PEB, 100 will be reserved for this UBI device).");
MODULE_VERSION(__stringify(UBI_VERSION));
MODULE_DESCRIPTION("UBI - Unsorted Block Images");