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generic: backport BLOCK OF support patch

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Backport BLOCK OF support patch merged upstream and refresh pending
BLOCK patches.

This is a new way to declare partition table for BLOCK device (eMMC
currently supported) with the use of DTS.

Current pending patch are adapted to not cause regression with current
downstream implementation of a similar functionality.

Also enable the new OF_PARTITION config by default.

Link: https://github.com/openwrt/openwrt/pull/16663
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
This commit is contained in:
Christian Marangi 2024-10-11 14:05:40 +02:00
parent 48b8c602d0
commit f9a70a20c5
No known key found for this signature in database
GPG Key ID: AC001D09ADBFEAD7
10 changed files with 470 additions and 28 deletions
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6
target/linux/bcm27xx/patches-6.6/950-0092-MMC-added-alternative-MMC-driver.patch
View File

@ -285,7 +285,7 @@ Signed-off-by: Phil Elwell <phil@raspberrypi.com>
static inline int mmc_blk_part_switch(struct mmc_card *card,
unsigned int part_type);
static void mmc_blk_rw_rq_prep(struct mmc_queue_req *mqrq,
@@ -3016,6 +3023,8 @@ static int mmc_blk_probe(struct mmc_card
@@ -3066,6 +3073,8 @@ static int mmc_blk_probe(struct mmc_card
{
struct mmc_blk_data *md;
int ret = 0;
@ -294,7 +294,7 @@ Signed-off-by: Phil Elwell <phil@raspberrypi.com>
/*
* Check that the card supports the command class(es) we need.
@@ -3023,7 +3032,16 @@ static int mmc_blk_probe(struct mmc_card
@@ -3073,7 +3082,16 @@ static int mmc_blk_probe(struct mmc_card
if (!(card->csd.cmdclass & CCC_BLOCK_READ))
return -ENODEV;
@ -312,7 +312,7 @@ Signed-off-by: Phil Elwell <phil@raspberrypi.com>
card->complete_wq = alloc_workqueue("mmc_complete",
WQ_MEM_RECLAIM | WQ_HIGHPRI, 0);
@@ -3038,6 +3056,17 @@ static int mmc_blk_probe(struct mmc_card
@@ -3088,6 +3106,17 @@ static int mmc_blk_probe(struct mmc_card
goto out_free;
}

53
target/linux/generic/backport-6.6/410-v6.13-01-block-add-support-for-defining-read-only-partitions.patch Normal file
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@ -0,0 +1,53 @@
From 03cb793b26834ddca170ba87057c8f883772dd45 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 3 Oct 2024 00:11:41 +0200
Subject: [PATCH 1/5] block: add support for defining read-only partitions
Add support for defining read-only partitions and complete support for
it in the cmdline partition parser as the additional "ro" after a
partition is scanned but never actually applied.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241002221306.4403-2-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/blk.h | 1 +
block/partitions/cmdline.c | 3 +++
block/partitions/core.c | 3 +++
3 files changed, 7 insertions(+)
--- a/block/blk.h
+++ b/block/blk.h
@@ -424,6 +424,7 @@ void blk_free_ext_minor(unsigned int min
#define ADDPART_FLAG_NONE 0
#define ADDPART_FLAG_RAID 1
#define ADDPART_FLAG_WHOLEDISK 2
+#define ADDPART_FLAG_READONLY 4
int bdev_add_partition(struct gendisk *disk, int partno, sector_t start,
sector_t length);
int bdev_del_partition(struct gendisk *disk, int partno);
--- a/block/partitions/cmdline.c
+++ b/block/partitions/cmdline.c
@@ -237,6 +237,9 @@ static int add_part(int slot, struct cmd
put_partition(state, slot, subpart->from >> 9,
subpart->size >> 9);
+ if (subpart->flags & PF_RDONLY)
+ state->parts[slot].flags |= ADDPART_FLAG_READONLY;
+
info = &state->parts[slot].info;
strscpy(info->volname, subpart->name, sizeof(info->volname));
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -392,6 +392,9 @@ static struct block_device *add_partitio
goto out_del;
}
+ if (flags & ADDPART_FLAG_READONLY)
+ bdev->bd_read_only = true;
+
/* everything is up and running, commence */
err = xa_insert(&disk->part_tbl, partno, bdev, GFP_KERNEL);
if (err)

94
target/linux/generic/backport-6.6/410-v6.13-03-block-introduce-add_disk_fwnode.patch Normal file
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@ -0,0 +1,94 @@
From e5f587242b6072ffab4f4a084a459a59f3035873 Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 3 Oct 2024 00:11:43 +0200
Subject: [PATCH 3/5] block: introduce add_disk_fwnode()
Introduce add_disk_fwnode() as a replacement of device_add_disk() that
permits to pass and attach a fwnode to disk dev.
This variant can be useful for eMMC that might have the partition table
for the disk defined in DT. A parser can later make use of the attached
fwnode to parse the related table and init the hardcoded partition for
the disk.
device_add_disk() is converted to a simple wrapper of add_disk_fwnode()
with the fwnode entry set as NULL.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241002221306.4403-4-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/genhd.c | 28 ++++++++++++++++++++++++----
include/linux/blkdev.h | 3 +++
2 files changed, 27 insertions(+), 4 deletions(-)
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -383,16 +383,18 @@ int disk_scan_partitions(struct gendisk
}
/**
- * device_add_disk - add disk information to kernel list
+ * add_disk_fwnode - add disk information to kernel list with fwnode
* @parent: parent device for the disk
* @disk: per-device partitioning information
* @groups: Additional per-device sysfs groups
+ * @fwnode: attached disk fwnode
*
* This function registers the partitioning information in @disk
- * with the kernel.
+ * with the kernel. Also attach a fwnode to the disk device.
*/
-int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
- const struct attribute_group **groups)
+int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups,
+ struct fwnode_handle *fwnode)
{
struct device *ddev = disk_to_dev(disk);
@@ -451,6 +453,8 @@ int __must_check device_add_disk(struct
ddev->parent = parent;
ddev->groups = groups;
dev_set_name(ddev, "%s", disk->disk_name);
+ if (fwnode)
+ device_set_node(ddev, fwnode);
if (!(disk->flags & GENHD_FL_HIDDEN))
ddev->devt = MKDEV(disk->major, disk->first_minor);
ret = device_add(ddev);
@@ -552,6 +556,22 @@ out_exit_elevator:
elevator_exit(disk->queue);
return ret;
}
+EXPORT_SYMBOL_GPL(add_disk_fwnode);
+
+/**
+ * device_add_disk - add disk information to kernel list
+ * @parent: parent device for the disk
+ * @disk: per-device partitioning information
+ * @groups: Additional per-device sysfs groups
+ *
+ * This function registers the partitioning information in @disk
+ * with the kernel.
+ */
+int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups)
+{
+ return add_disk_fwnode(parent, disk, groups, NULL);
+}
EXPORT_SYMBOL(device_add_disk);
static void blk_report_disk_dead(struct gendisk *disk, bool surprise)
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -741,6 +741,9 @@ static inline unsigned int blk_queue_dep
#define for_each_bio(_bio) \
for (; _bio; _bio = _bio->bi_next)
+int __must_check add_disk_fwnode(struct device *parent, struct gendisk *disk,
+ const struct attribute_group **groups,
+ struct fwnode_handle *fwnode);
int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
const struct attribute_group **groups);
static inline int __must_check add_disk(struct gendisk *disk)

104
target/linux/generic/backport-6.6/410-v6.13-04-mmc-block-attach-partitions-fwnode-if-found-in-mmc-c.patch Normal file
View File

@ -0,0 +1,104 @@
From 45ff6c340ddfc2dade74d5b7a8962c778ab7042c Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 3 Oct 2024 00:11:44 +0200
Subject: [PATCH 4/5] mmc: block: attach partitions fwnode if found in mmc-card
Attach partitions fwnode if found in mmc-card and register disk with it.
This permits block partition to reference the node and register a
partition table defined in DT for the special case for embedded device
that doesn't have a partition table flashed but have an hardcoded
partition table passed from the system.
JEDEC BOOT partition boot0/boot1 are supported but in DT we refer with
the JEDEC name of boot1 and boot2 to better adhere to documentation.
Also JEDEC GP partition gp0/1/2/3 are supported but in DT we refer with
the JEDEC name of gp1/2/3/4 to better adhere to documentration.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://lore.kernel.org/r/20241002221306.4403-5-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
drivers/mmc/core/block.c | 55 +++++++++++++++++++++++++++++++++++++++-
1 file changed, 54 insertions(+), 1 deletion(-)
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2455,6 +2455,56 @@ static inline int mmc_blk_readonly(struc
!(card->csd.cmdclass & CCC_BLOCK_WRITE);
}
+/*
+ * Search for a declared partitions node for the disk in mmc-card related node.
+ *
+ * This is to permit support for partition table defined in DT in special case
+ * where a partition table is not written in the disk and is expected to be
+ * passed from the running system.
+ *
+ * For the user disk, "partitions" node is searched.
+ * For the special HW disk, "partitions-" node with the appended name is used
+ * following this conversion table (to adhere to JEDEC naming)
+ * - boot0 -> partitions-boot1
+ * - boot1 -> partitions-boot2
+ * - gp0 -> partitions-gp1
+ * - gp1 -> partitions-gp2
+ * - gp2 -> partitions-gp3
+ * - gp3 -> partitions-gp4
+ */
+static struct fwnode_handle *mmc_blk_get_partitions_node(struct device *mmc_dev,
+ const char *subname)
+{
+ const char *node_name = "partitions";
+
+ if (subname) {
+ mmc_dev = mmc_dev->parent;
+
+ /*
+ * Check if we are allocating a BOOT disk boot0/1 disk.
+ * In DT we use the JEDEC naming boot1/2.
+ */
+ if (!strcmp(subname, "boot0"))
+ node_name = "partitions-boot1";
+ if (!strcmp(subname, "boot1"))
+ node_name = "partitions-boot2";
+ /*
+ * Check if we are allocating a GP disk gp0/1/2/3 disk.
+ * In DT we use the JEDEC naming gp1/2/3/4.
+ */
+ if (!strcmp(subname, "gp0"))
+ node_name = "partitions-gp1";
+ if (!strcmp(subname, "gp1"))
+ node_name = "partitions-gp2";
+ if (!strcmp(subname, "gp2"))
+ node_name = "partitions-gp3";
+ if (!strcmp(subname, "gp3"))
+ node_name = "partitions-gp4";
+ }
+
+ return device_get_named_child_node(mmc_dev, node_name);
+}
+
static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
struct device *parent,
sector_t size,
@@ -2463,6 +2513,7 @@ static struct mmc_blk_data *mmc_blk_allo
int area_type,
unsigned int part_type)
{
+ struct fwnode_handle *disk_fwnode;
struct mmc_blk_data *md;
int devidx, ret;
char cap_str[10];
@@ -2568,7 +2619,9 @@ static struct mmc_blk_data *mmc_blk_allo
/* used in ->open, must be set before add_disk: */
if (area_type == MMC_BLK_DATA_AREA_MAIN)
dev_set_drvdata(&card->dev, md);
- ret = device_add_disk(md->parent, md->disk, mmc_disk_attr_groups);
+ disk_fwnode = mmc_blk_get_partitions_node(parent, subname);
+ ret = add_disk_fwnode(md->parent, md->disk, mmc_disk_attr_groups,
+ disk_fwnode);
if (ret)
goto err_put_disk;
return md;

200
target/linux/generic/backport-6.6/410-v6.13-05-block-add-support-for-partition-table-defined-in-OF.patch Normal file
View File

@ -0,0 +1,200 @@
From 884555b557e5e6d41c866e2cd8d7b32f50ec974b Mon Sep 17 00:00:00 2001
From: Christian Marangi <ansuelsmth@gmail.com>
Date: Thu, 3 Oct 2024 00:11:45 +0200
Subject: [PATCH 5/5] block: add support for partition table defined in OF
Add support for partition table defined in Device Tree. Similar to how
it's done with MTD, add support for defining a fixed partition table in
device tree.
A common scenario for this is fixed block (eMMC) embedded devices that
have no MBR or GPT partition table to save storage space. Bootloader
access the block device with absolute address of data.
This is to complete the functionality with an equivalent implementation
with providing partition table with bootargs, for case where the booargs
can't be modified and tweaking the Device Tree is the only solution to
have an usabe partition table.
The implementation follow the fixed-partitions parser used on MTD
devices where a "partitions" node is expected to be declared with
"fixed-partitions" compatible in the OF node of the disk device
(mmc-card for eMMC for example) and each child node declare a label
and a reg with offset and size. If label is not declared, the node name
is used as fallback. Eventually is also possible to declare the read-only
property to flag the partition as read-only.
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20241002221306.4403-6-ansuelsmth@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
---
block/partitions/Kconfig | 9 ++++
block/partitions/Makefile | 1 +
block/partitions/check.h | 1 +
block/partitions/core.c | 3 ++
block/partitions/of.c | 110 ++++++++++++++++++++++++++++++++++++++
5 files changed, 124 insertions(+)
create mode 100644 block/partitions/of.c
--- a/block/partitions/Kconfig
+++ b/block/partitions/Kconfig
@@ -270,4 +270,13 @@ config CMDLINE_PARTITION
Say Y here if you want to read the partition table from bootargs.
The format for the command line is just like mtdparts.
+config OF_PARTITION
+ bool "Device Tree partition support" if PARTITION_ADVANCED
+ depends on OF
+ help
+ Say Y here if you want to enable support for partition table
+ defined in Device Tree. (mainly for eMMC)
+ The format for the device tree node is just like MTD fixed-partition
+ schema.
+
endmenu
--- a/block/partitions/Makefile
+++ b/block/partitions/Makefile
@@ -12,6 +12,7 @@ obj-$(CONFIG_CMDLINE_PARTITION) += cmdli
obj-$(CONFIG_MAC_PARTITION) += mac.o
obj-$(CONFIG_LDM_PARTITION) += ldm.o
obj-$(CONFIG_MSDOS_PARTITION) += msdos.o
+obj-$(CONFIG_OF_PARTITION) += of.o
obj-$(CONFIG_OSF_PARTITION) += osf.o
obj-$(CONFIG_SGI_PARTITION) += sgi.o
obj-$(CONFIG_SUN_PARTITION) += sun.o
--- a/block/partitions/check.h
+++ b/block/partitions/check.h
@@ -62,6 +62,7 @@ int karma_partition(struct parsed_partit
int ldm_partition(struct parsed_partitions *state);
int mac_partition(struct parsed_partitions *state);
int msdos_partition(struct parsed_partitions *state);
+int of_partition(struct parsed_partitions *state);
int osf_partition(struct parsed_partitions *state);
int sgi_partition(struct parsed_partitions *state);
int sun_partition(struct parsed_partitions *state);
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -43,6 +43,9 @@ static int (*const check_part[])(struct
#ifdef CONFIG_CMDLINE_PARTITION
cmdline_partition,
#endif
+#ifdef CONFIG_OF_PARTITION
+ of_partition, /* cmdline have priority to OF */
+#endif
#ifdef CONFIG_EFI_PARTITION
efi_partition, /* this must come before msdos */
#endif
--- /dev/null
+++ b/block/partitions/of.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/blkdev.h>
+#include <linux/major.h>
+#include <linux/of.h>
+#include <linux/string.h>
+#include "check.h"
+
+static int validate_of_partition(struct device_node *np, int slot)
+{
+ u64 offset, size;
+ int len;
+
+ const __be32 *reg = of_get_property(np, "reg", &len);
+ int a_cells = of_n_addr_cells(np);
+ int s_cells = of_n_size_cells(np);
+
+ /* Make sure reg len match the expected addr and size cells */
+ if (len / sizeof(*reg) != a_cells + s_cells)
+ return -EINVAL;
+
+ /* Validate offset conversion from bytes to sectors */
+ offset = of_read_number(reg, a_cells);
+ if (offset % SECTOR_SIZE)
+ return -EINVAL;
+
+ /* Validate size conversion from bytes to sectors */
+ size = of_read_number(reg + a_cells, s_cells);
+ if (!size || size % SECTOR_SIZE)
+ return -EINVAL;
+
+ return 0;
+}
+
+static void add_of_partition(struct parsed_partitions *state, int slot,
+ struct device_node *np)
+{
+ struct partition_meta_info *info;
+ char tmp[sizeof(info->volname) + 4];
+ const char *partname;
+ int len;
+
+ const __be32 *reg = of_get_property(np, "reg", &len);
+ int a_cells = of_n_addr_cells(np);
+ int s_cells = of_n_size_cells(np);
+
+ /* Convert bytes to sector size */
+ u64 offset = of_read_number(reg, a_cells) / SECTOR_SIZE;
+ u64 size = of_read_number(reg + a_cells, s_cells) / SECTOR_SIZE;
+
+ put_partition(state, slot, offset, size);
+
+ if (of_property_read_bool(np, "read-only"))
+ state->parts[slot].flags |= ADDPART_FLAG_READONLY;
+
+ /*
+ * Follow MTD label logic, search for label property,
+ * fallback to node name if not found.
+ */
+ info = &state->parts[slot].info;
+ partname = of_get_property(np, "label", &len);
+ if (!partname)
+ partname = of_get_property(np, "name", &len);
+ strscpy(info->volname, partname, sizeof(info->volname));
+
+ snprintf(tmp, sizeof(tmp), "(%s)", info->volname);
+ strlcat(state->pp_buf, tmp, PAGE_SIZE);
+}
+
+int of_partition(struct parsed_partitions *state)
+{
+ struct device *ddev = disk_to_dev(state->disk);
+ struct device_node *np;
+ int slot;
+
+ struct device_node *partitions_np = of_node_get(ddev->of_node);
+
+ if (!partitions_np ||
+ !of_device_is_compatible(partitions_np, "fixed-partitions"))
+ return 0;
+
+ slot = 1;
+ /* Validate parition offset and size */
+ for_each_child_of_node(partitions_np, np) {
+ if (validate_of_partition(np, slot)) {
+ of_node_put(np);
+ of_node_put(partitions_np);
+
+ return -1;
+ }
+
+ slot++;
+ }
+
+ slot = 1;
+ for_each_child_of_node(partitions_np, np) {
+ if (slot >= state->limit) {
+ of_node_put(np);
+ break;
+ }
+
+ add_of_partition(state, slot, np);
+
+ slot++;
+ }
+
+ strlcat(state->pp_buf, "\n", PAGE_SIZE);
+
+ return 1;
+}

1
target/linux/generic/config-6.6
View File

@ -4358,6 +4358,7 @@ CONFIG_NLS_DEFAULT="iso8859-1"
# CONFIG_OCTEONTX2_PF is not set
# CONFIG_OCTEON_EP is not set
# CONFIG_OF_OVERLAY is not set
CONFIG_OF_PARTITION=y
CONFIG_OF_RESERVED_MEM=y
# CONFIG_OF_UNITTEST is not set
# CONFIG_OID_REGISTRY is not set

4
target/linux/generic/pending-6.6/451-block-partitions-populate-fwnode.patch
View File

@ -49,7 +49,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
#include "check.h"
static int (*const check_part[])(struct parsed_partitions *) = {
@@ -292,6 +294,74 @@ static ssize_t whole_disk_show(struct de
@@ -295,6 +297,74 @@ static ssize_t whole_disk_show(struct de
}
static const DEVICE_ATTR(whole_disk, 0444, whole_disk_show, NULL);
@ -124,7 +124,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
/*
* Must be called either with open_mutex held, before a disk can be opened or
* after all disk users are gone.
@@ -374,6 +444,8 @@ static struct block_device *add_partitio
@@ -377,6 +447,8 @@ static struct block_device *add_partitio
goto out_put;
}

2
target/linux/generic/pending-6.6/452-block-add-support-for-notifications.patch
View File

@ -156,7 +156,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
+device_initcall(blk_notifications_init);
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -1564,4 +1564,15 @@ struct io_comp_batch {
@@ -1567,4 +1567,15 @@ struct io_comp_batch {
#define DEFINE_IO_COMP_BATCH(name) struct io_comp_batch name = { }

32
target/linux/generic/pending-6.6/457-mmc-block-set-fwnode-of-disk-devices.patch
View File

@ -14,24 +14,14 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2463,6 +2463,7 @@ static struct mmc_blk_data *mmc_blk_allo
int area_type,
unsigned int part_type)
{
+ struct fwnode_handle *fwnode;
struct mmc_blk_data *md;
int devidx, ret;
char cap_str[10];
@@ -2559,6 +2560,12 @@ static struct mmc_blk_data *mmc_blk_allo
blk_queue_write_cache(md->queue.queue, cache_enabled, fua_enabled);
+ fwnode = device_get_named_child_node(subname ? md->parent->parent :
+ md->parent,
+ subname ? subname : "block");
+ if (fwnode)
+ device_set_node(disk_to_dev(md->disk), fwnode);
+
string_get_size((u64)size, 512, STRING_UNITS_2,
cap_str, sizeof(cap_str));
pr_info("%s: %s %s %s%s\n",
@@ -2620,6 +2620,10 @@ static struct mmc_blk_data *mmc_blk_allo
if (area_type == MMC_BLK_DATA_AREA_MAIN)
dev_set_drvdata(&card->dev, md);
disk_fwnode = mmc_blk_get_partitions_node(parent, subname);
+ if (!disk_fwnode)
+ disk_fwnode = device_get_named_child_node(subname ? md->parent->parent :
+ md->parent,
+ subname ? subname : "block");
ret = add_disk_fwnode(md->parent, md->disk, mmc_disk_attr_groups,
disk_fwnode);
if (ret)

2
target/linux/generic/pending-6.6/458-mmc-block-set-GENHD_FL_NVMEM.patch
View File

@ -12,7 +12,7 @@ Signed-off-by: Daniel Golle <daniel@makrotopia.org>
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2516,6 +2516,7 @@ static struct mmc_blk_data *mmc_blk_allo
@@ -2566,6 +2566,7 @@ static struct mmc_blk_data *mmc_blk_allo
md->disk->major = MMC_BLOCK_MAJOR;
md->disk->minors = perdev_minors;
md->disk->first_minor = devidx * perdev_minors;