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path: root/drivers/mtd/ubi/build.c
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Diffstat (limited to 'drivers/mtd/ubi/build.c')
-rw-r--r--drivers/mtd/ubi/build.c204
1 files changed, 126 insertions, 78 deletions
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 2c5ed5ca9c3..34977039850 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -36,6 +36,7 @@
#include <linux/namei.h>
#include <linux/stat.h>
#include <linux/miscdevice.h>
+#include <linux/mtd/partitions.h>
#include <linux/log2.h>
#include <linux/kthread.h>
#include <linux/kernel.h>
@@ -45,6 +46,12 @@
/* Maximum length of the 'mtd=' parameter */
#define MTD_PARAM_LEN_MAX 64
+/* Maximum number of comma-separated items in the 'mtd=' parameter */
+#define MTD_PARAM_MAX_COUNT 3
+
+/* Maximum value for the number of bad PEBs per 1024 PEBs */
+#define MAX_MTD_UBI_BEB_LIMIT 768
+
#ifdef CONFIG_MTD_UBI_MODULE
#define ubi_is_module() 1
#else
@@ -56,10 +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 */
@@ -564,9 +573,38 @@ void ubi_free_internal_volumes(struct ubi_device *ubi)
}
}
+static int get_bad_peb_limit(const struct ubi_device *ubi, int max_beb_per1024)
+{
+ int limit, device_pebs;
+ uint64_t device_size;
+
+ if (!max_beb_per1024)
+ return 0;
+
+ /*
+ * Here we are using size of the entire flash chip and
+ * not just the MTD partition size because the maximum
+ * number of bad eraseblocks is a percentage of the
+ * whole device and bad eraseblocks are not fairly
+ * distributed over the flash chip. So the worst case
+ * is that all the bad eraseblocks of the chip are in
+ * the MTD partition we are attaching (ubi->mtd).
+ */
+ device_size = mtd_get_device_size(ubi->mtd);
+ device_pebs = mtd_div_by_eb(device_size, ubi->mtd);
+ limit = mult_frac(device_pebs, max_beb_per1024, 1024);
+
+ /* Round it up */
+ if (mult_frac(limit, 1024, max_beb_per1024) < device_pebs)
+ limit += 1;
+
+ return limit;
+}
+
/**
* io_init - initialize I/O sub-system for a given UBI device.
* @ubi: UBI device description object
+ * @max_beb_per1024: maximum expected number of bad PEB per 1024 PEBs
*
* If @ubi->vid_hdr_offset or @ubi->leb_start is zero, default offsets are
* assumed:
@@ -579,8 +617,11 @@ void ubi_free_internal_volumes(struct ubi_device *ubi)
* This function returns zero in case of success and a negative error code in
* case of failure.
*/
-static int io_init(struct ubi_device *ubi)
+static int io_init(struct ubi_device *ubi, int max_beb_per1024)
{
+ dbg_gen("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
+ dbg_gen("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
+
if (ubi->mtd->numeraseregions != 0) {
/*
* Some flashes have several erase regions. Different regions
@@ -607,8 +648,10 @@ static int io_init(struct ubi_device *ubi)
ubi->peb_count = mtd_div_by_eb(ubi->mtd->size, ubi->mtd);
ubi->flash_size = ubi->mtd->size;
- if (mtd_can_have_bb(ubi->mtd))
+ if (mtd_can_have_bb(ubi->mtd)) {
ubi->bad_allowed = 1;
+ ubi->bad_peb_limit = get_bad_peb_limit(ubi, max_beb_per1024);
+ }
if (ubi->mtd->type == MTD_NORFLASH) {
ubi_assert(ubi->mtd->writesize == 1);
@@ -650,11 +693,11 @@ static int io_init(struct ubi_device *ubi)
ubi->ec_hdr_alsize = ALIGN(UBI_EC_HDR_SIZE, ubi->hdrs_min_io_size);
ubi->vid_hdr_alsize = ALIGN(UBI_VID_HDR_SIZE, ubi->hdrs_min_io_size);
- dbg_msg("min_io_size %d", ubi->min_io_size);
- dbg_msg("max_write_size %d", ubi->max_write_size);
- dbg_msg("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
- dbg_msg("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
- dbg_msg("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
+ dbg_gen("min_io_size %d", ubi->min_io_size);
+ dbg_gen("max_write_size %d", ubi->max_write_size);
+ dbg_gen("hdrs_min_io_size %d", ubi->hdrs_min_io_size);
+ dbg_gen("ec_hdr_alsize %d", ubi->ec_hdr_alsize);
+ dbg_gen("vid_hdr_alsize %d", ubi->vid_hdr_alsize);
if (ubi->vid_hdr_offset == 0)
/* Default offset */
@@ -671,10 +714,10 @@ static int io_init(struct ubi_device *ubi)
ubi->leb_start = ubi->vid_hdr_offset + UBI_VID_HDR_SIZE;
ubi->leb_start = ALIGN(ubi->leb_start, ubi->min_io_size);
- dbg_msg("vid_hdr_offset %d", ubi->vid_hdr_offset);
- dbg_msg("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
- dbg_msg("vid_hdr_shift %d", ubi->vid_hdr_shift);
- dbg_msg("leb_start %d", ubi->leb_start);
+ dbg_gen("vid_hdr_offset %d", ubi->vid_hdr_offset);
+ dbg_gen("vid_hdr_aloffset %d", ubi->vid_hdr_aloffset);
+ dbg_gen("vid_hdr_shift %d", ubi->vid_hdr_shift);
+ dbg_gen("leb_start %d", ubi->leb_start);
/* The shift must be aligned to 32-bit boundary */
if (ubi->vid_hdr_shift % 4) {
@@ -700,7 +743,7 @@ static int io_init(struct ubi_device *ubi)
ubi->max_erroneous = ubi->peb_count / 10;
if (ubi->max_erroneous < 16)
ubi->max_erroneous = 16;
- dbg_msg("max_erroneous %d", ubi->max_erroneous);
+ dbg_gen("max_erroneous %d", ubi->max_erroneous);
/*
* It may happen that EC and VID headers are situated in one minimal
@@ -708,30 +751,18 @@ static int io_init(struct ubi_device *ubi)
* read-only mode.
*/
if (ubi->vid_hdr_offset + UBI_VID_HDR_SIZE <= ubi->hdrs_min_io_size) {
- ubi_warn("EC and VID headers are in the same minimal I/O unit, "
- "switch to read-only mode");
+ ubi_warn("EC and VID headers are in the same minimal I/O unit, switch to read-only mode");
ubi->ro_mode = 1;
}
ubi->leb_size = ubi->peb_size - ubi->leb_start;
if (!(ubi->mtd->flags & MTD_WRITEABLE)) {
- ubi_msg("MTD device %d is write-protected, attach in "
- "read-only mode", ubi->mtd->index);
+ ubi_msg("MTD device %d is write-protected, attach in read-only mode",
+ ubi->mtd->index);
ubi->ro_mode = 1;
}
- ubi_msg("physical eraseblock size: %d bytes (%d KiB)",
- ubi->peb_size, ubi->peb_size >> 10);
- ubi_msg("logical eraseblock size: %d bytes", ubi->leb_size);
- ubi_msg("smallest flash I/O unit: %d", ubi->min_io_size);
- if (ubi->hdrs_min_io_size != ubi->min_io_size)
- ubi_msg("sub-page size: %d",
- ubi->hdrs_min_io_size);
- ubi_msg("VID header offset: %d (aligned %d)",
- ubi->vid_hdr_offset, ubi->vid_hdr_aloffset);
- ubi_msg("data offset: %d", ubi->leb_start);
-
/*
* Note, ideally, we have to initialize @ubi->bad_peb_count here. But
* unfortunately, MTD does not provide this information. We should loop
@@ -759,6 +790,11 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
struct ubi_volume *vol = ubi->volumes[vol_id];
int err, old_reserved_pebs = vol->reserved_pebs;
+ if (ubi->ro_mode) {
+ ubi_warn("skip auto-resize because of R/O mode");
+ return 0;
+ }
+
/*
* Clear the auto-resize flag in the volume in-memory copy of the
* volume table, and 'ubi_resize_volume()' will propagate this change
@@ -800,6 +836,7 @@ 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 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
@@ -810,11 +847,18 @@ static int autoresize(struct ubi_device *ubi, int vol_id)
* Note, the invocations of this function has to be serialized by the
* @ubi_devices_mutex.
*/
-int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
+int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num,
+ int vid_hdr_offset, int max_beb_per1024)
{
struct ubi_device *ubi;
int i, err, ref = 0;
+ if (max_beb_per1024 < 0 || max_beb_per1024 > MAX_MTD_UBI_BEB_LIMIT)
+ return -EINVAL;
+
+ if (!max_beb_per1024)
+ max_beb_per1024 = CONFIG_MTD_UBI_BEB_LIMIT;
+
/*
* Check if we already have the same MTD device attached.
*
@@ -839,8 +883,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
* no sense to attach emulated MTD devices, so we prohibit this.
*/
if (mtd->type == MTD_UBIVOLUME) {
- ubi_err("refuse attaching mtd%d - it is already emulated on "
- "top of UBI", mtd->index);
+ ubi_err("refuse attaching mtd%d - it is already emulated on top of UBI",
+ mtd->index);
return -EINVAL;
}
@@ -880,10 +924,8 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
spin_lock_init(&ubi->volumes_lock);
ubi_msg("attaching mtd%d to ubi%d", mtd->index, ubi_num);
- dbg_msg("sizeof(struct ubi_ainf_peb) %zu", sizeof(struct ubi_ainf_peb));
- dbg_msg("sizeof(struct ubi_wl_entry) %zu", sizeof(struct ubi_wl_entry));
- err = io_init(ubi);
+ err = io_init(ubi, max_beb_per1024);
if (err)
goto out_free;
@@ -924,23 +966,24 @@ int ubi_attach_mtd_dev(struct mtd_info *mtd, int ubi_num, int vid_hdr_offset)
goto out_debugfs;
}
- ubi_msg("attached mtd%d to ubi%d", mtd->index, ubi_num);
- ubi_msg("MTD device name: \"%s\"", mtd->name);
- ubi_msg("MTD device size: %llu MiB", ubi->flash_size >> 20);
- ubi_msg("number of good PEBs: %d", ubi->good_peb_count);
- ubi_msg("number of bad PEBs: %d", ubi->bad_peb_count);
- ubi_msg("number of corrupted PEBs: %d", ubi->corr_peb_count);
- ubi_msg("max. allowed volumes: %d", ubi->vtbl_slots);
- ubi_msg("wear-leveling threshold: %d", CONFIG_MTD_UBI_WL_THRESHOLD);
- ubi_msg("number of internal volumes: %d", UBI_INT_VOL_COUNT);
- ubi_msg("number of user volumes: %d",
- ubi->vol_count - UBI_INT_VOL_COUNT);
- ubi_msg("available PEBs: %d", ubi->avail_pebs);
- ubi_msg("total number of reserved PEBs: %d", ubi->rsvd_pebs);
- ubi_msg("number of PEBs reserved for bad PEB handling: %d",
- ubi->beb_rsvd_pebs);
- ubi_msg("max/mean erase counter: %d/%d", ubi->max_ec, ubi->mean_ec);
- ubi_msg("image sequence number: %d", ubi->image_seq);
+ ubi_msg("attached mtd%d (name \"%s\", size %llu MiB) to ubi%d",
+ mtd->index, mtd->name, ubi->flash_size >> 20, ubi_num);
+ ubi_msg("PEB size: %d bytes (%d KiB), LEB size: %d bytes",
+ ubi->peb_size, ubi->peb_size >> 10, ubi->leb_size);
+ ubi_msg("min./max. I/O unit sizes: %d/%d, sub-page size %d",
+ ubi->min_io_size, ubi->max_write_size, ubi->hdrs_min_io_size);
+ ubi_msg("VID header offset: %d (aligned %d), data offset: %d",
+ ubi->vid_hdr_offset, ubi->vid_hdr_aloffset, ubi->leb_start);
+ ubi_msg("good PEBs: %d, bad PEBs: %d, corrupted PEBs: %d",
+ ubi->good_peb_count, ubi->bad_peb_count, ubi->corr_peb_count);
+ ubi_msg("user volume: %d, internal volumes: %d, max. volumes count: %d",
+ ubi->vol_count - UBI_INT_VOL_COUNT, UBI_INT_VOL_COUNT,
+ ubi->vtbl_slots);
+ ubi_msg("max/mean erase counter: %d/%d, WL threshold: %d, image sequence number: %u",
+ ubi->max_ec, ubi->mean_ec, CONFIG_MTD_UBI_WL_THRESHOLD,
+ ubi->image_seq);
+ ubi_msg("available PEBs: %d, total reserved PEBs: %d, PEBs reserved for bad PEB handling: %d",
+ ubi->avail_pebs, ubi->rsvd_pebs, ubi->beb_rsvd_pebs);
/*
* The below lock makes sure we do not race with 'ubi_thread()' which
@@ -1017,7 +1060,7 @@ int ubi_detach_mtd_dev(int ubi_num, int anyway)
ubi_assert(ubi_num == ubi->ubi_num);
ubi_notify_all(ubi, UBI_VOLUME_REMOVED, NULL);
- dbg_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
+ ubi_msg("detaching mtd%d from ubi%d", ubi->mtd->index, ubi_num);
/*
* Before freeing anything, we have to stop the background thread to
@@ -1172,7 +1215,7 @@ 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);
+ p->vid_hdr_offs, p->max_beb_per1024);
mutex_unlock(&ubi_devices_mutex);
if (err < 0) {
ubi_err("cannot attach mtd%d", mtd->index);
@@ -1218,7 +1261,7 @@ out:
ubi_err("UBI error: cannot initialize UBI, error %d", err);
return err;
}
-module_init(ubi_init);
+late_initcall(ubi_init);
static void __exit ubi_exit(void)
{
@@ -1252,8 +1295,7 @@ static int __init bytes_str_to_int(const char *str)
result = simple_strtoul(str, &endp, 0);
if (str == endp || result >= INT_MAX) {
- printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n",
- str);
+ ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str);
return -EINVAL;
}
@@ -1269,8 +1311,7 @@ static int __init bytes_str_to_int(const char *str)
case '\0':
break;
default:
- printk(KERN_ERR "UBI error: incorrect bytes count: \"%s\"\n",
- str);
+ ubi_err("UBI error: incorrect bytes count: \"%s\"\n", str);
return -EINVAL;
}
@@ -1291,27 +1332,26 @@ static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
struct mtd_dev_param *p;
char buf[MTD_PARAM_LEN_MAX];
char *pbuf = &buf[0];
- char *tokens[2] = {NULL, NULL};
+ char *tokens[MTD_PARAM_MAX_COUNT];
if (!val)
return -EINVAL;
if (mtd_devs == UBI_MAX_DEVICES) {
- printk(KERN_ERR "UBI error: too many parameters, max. is %d\n",
- UBI_MAX_DEVICES);
+ ubi_err("UBI error: too many parameters, max. is %d\n",
+ UBI_MAX_DEVICES);
return -EINVAL;
}
len = strnlen(val, MTD_PARAM_LEN_MAX);
if (len == MTD_PARAM_LEN_MAX) {
- printk(KERN_ERR "UBI error: parameter \"%s\" is too long, "
- "max. is %d\n", val, MTD_PARAM_LEN_MAX);
+ ubi_err("UBI error: parameter \"%s\" is too long, max. is %d\n",
+ val, MTD_PARAM_LEN_MAX);
return -EINVAL;
}
if (len == 0) {
- printk(KERN_WARNING "UBI warning: empty 'mtd=' parameter - "
- "ignored\n");
+ pr_warn("UBI warning: empty 'mtd=' parameter - ignored\n");
return 0;
}
@@ -1321,12 +1361,11 @@ static int __init ubi_mtd_param_parse(const char *val, struct kernel_param *kp)
if (buf[len - 1] == '\n')
buf[len - 1] = '\0';
- for (i = 0; i < 2; i++)
+ for (i = 0; i < MTD_PARAM_MAX_COUNT; i++)
tokens[i] = strsep(&pbuf, ",");
if (pbuf) {
- printk(KERN_ERR "UBI error: too many arguments at \"%s\"\n",
- val);
+ ubi_err("UBI error: too many arguments at \"%s\"\n", val);
return -EINVAL;
}
@@ -1339,23 +1378,32 @@ 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) {
+ ubi_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");
generated by cgit v1.2.3-18-g5258 (git 2.32.0) at 2024-12-26 18:22:46 +0000