diff options
author | Olof Johansson <olof@lixom.net> | 2010-09-17 21:19:57 -0400 |
---|---|---|
committer | Chris Ball <cjb@laptop.org> | 2010-10-24 21:28:46 -0400 |
commit | 5e71b7a64cb4c6cff75ca42b535d8227526ec592 (patch) | |
tree | 8bec2645c764c2711853ba4300d5eabcf80c3245 /drivers/mmc/card | |
parent | 061c6c847eeb11743e489a16e907b41c6f9042b6 (diff) |
mmc: make number of mmcblk minors configurable
The old limit of number of minor numbers per mmcblk device was hardcoded
at 8. This isn't enough for some of the more elaborate partitioning
schemes, for example those used by Chrome OS.
Since there might be a bunch of systems out there with static /dev
contents that relies on the old numbering scheme, let's make it a
build-time option with the default set to the previous 8.
Also provide a boot/modprobe-time parameter to override the config
default: mmcblk.perdev_minors.
Signed-off-by: Olof Johansson <olof@lixom.net>
Cc: Mandeep Baines <msb@chromium.org>
Cc: <linux-mmc@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/card')
-rw-r--r-- | drivers/mmc/card/Kconfig | 17 | ||||
-rw-r--r-- | drivers/mmc/card/block.c | 43 |
2 files changed, 48 insertions, 12 deletions
diff --git a/drivers/mmc/card/Kconfig b/drivers/mmc/card/Kconfig index 3f2a912659af..57e4416b9ef0 100644 --- a/drivers/mmc/card/Kconfig +++ b/drivers/mmc/card/Kconfig | |||
@@ -14,6 +14,23 @@ config MMC_BLOCK | |||
14 | mount the filesystem. Almost everyone wishing MMC support | 14 | mount the filesystem. Almost everyone wishing MMC support |
15 | should say Y or M here. | 15 | should say Y or M here. |
16 | 16 | ||
17 | config MMC_BLOCK_MINORS | ||
18 | int "Number of minors per block device" | ||
19 | range 4 256 | ||
20 | default 8 | ||
21 | help | ||
22 | Number of minors per block device. One is needed for every | ||
23 | partition on the disk (plus one for the whole disk). | ||
24 | |||
25 | Number of total MMC minors available is 256, so your number | ||
26 | of supported block devices will be limited to 256 divided | ||
27 | by this number. | ||
28 | |||
29 | Default is 8 to be backwards compatible with previous | ||
30 | hardwired device numbering. | ||
31 | |||
32 | If unsure, say 8 here. | ||
33 | |||
17 | config MMC_BLOCK_BOUNCE | 34 | config MMC_BLOCK_BOUNCE |
18 | bool "Use bounce buffer for simple hosts" | 35 | bool "Use bounce buffer for simple hosts" |
19 | depends on MMC_BLOCK | 36 | depends on MMC_BLOCK |
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index a9970504cabb..217f82037fc1 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c | |||
@@ -43,15 +43,27 @@ | |||
43 | #include "queue.h" | 43 | #include "queue.h" |
44 | 44 | ||
45 | MODULE_ALIAS("mmc:block"); | 45 | MODULE_ALIAS("mmc:block"); |
46 | #ifdef MODULE_PARAM_PREFIX | ||
47 | #undef MODULE_PARAM_PREFIX | ||
48 | #endif | ||
49 | #define MODULE_PARAM_PREFIX "mmcblk." | ||
50 | |||
51 | static DEFINE_MUTEX(block_mutex); | ||
46 | 52 | ||
47 | /* | 53 | /* |
48 | * max 8 partitions per card | 54 | * The defaults come from config options but can be overriden by module |
55 | * or bootarg options. | ||
49 | */ | 56 | */ |
50 | #define MMC_SHIFT 3 | 57 | static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; |
51 | #define MMC_NUM_MINORS (256 >> MMC_SHIFT) | ||
52 | 58 | ||
53 | static DEFINE_MUTEX(block_mutex); | 59 | /* |
54 | static DECLARE_BITMAP(dev_use, MMC_NUM_MINORS); | 60 | * We've only got one major, so number of mmcblk devices is |
61 | * limited to 256 / number of minors per device. | ||
62 | */ | ||
63 | static int max_devices; | ||
64 | |||
65 | /* 256 minors, so at most 256 separate devices */ | ||
66 | static DECLARE_BITMAP(dev_use, 256); | ||
55 | 67 | ||
56 | /* | 68 | /* |
57 | * There is one mmc_blk_data per slot. | 69 | * There is one mmc_blk_data per slot. |
@@ -67,6 +79,9 @@ struct mmc_blk_data { | |||
67 | 79 | ||
68 | static DEFINE_MUTEX(open_lock); | 80 | static DEFINE_MUTEX(open_lock); |
69 | 81 | ||
82 | module_param(perdev_minors, int, 0444); | ||
83 | MODULE_PARM_DESC(perdev_minors, "Minors numbers to allocate per device"); | ||
84 | |||
70 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) | 85 | static struct mmc_blk_data *mmc_blk_get(struct gendisk *disk) |
71 | { | 86 | { |
72 | struct mmc_blk_data *md; | 87 | struct mmc_blk_data *md; |
@@ -88,10 +103,10 @@ static void mmc_blk_put(struct mmc_blk_data *md) | |||
88 | md->usage--; | 103 | md->usage--; |
89 | if (md->usage == 0) { | 104 | if (md->usage == 0) { |
90 | int devmaj = MAJOR(disk_devt(md->disk)); | 105 | int devmaj = MAJOR(disk_devt(md->disk)); |
91 | int devidx = MINOR(disk_devt(md->disk)) >> MMC_SHIFT; | 106 | int devidx = MINOR(disk_devt(md->disk)) / perdev_minors; |
92 | 107 | ||
93 | if (!devmaj) | 108 | if (!devmaj) |
94 | devidx = md->disk->first_minor >> MMC_SHIFT; | 109 | devidx = md->disk->first_minor / perdev_minors; |
95 | 110 | ||
96 | blk_cleanup_queue(md->queue.queue); | 111 | blk_cleanup_queue(md->queue.queue); |
97 | 112 | ||
@@ -566,8 +581,8 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) | |||
566 | struct mmc_blk_data *md; | 581 | struct mmc_blk_data *md; |
567 | int devidx, ret; | 582 | int devidx, ret; |
568 | 583 | ||
569 | devidx = find_first_zero_bit(dev_use, MMC_NUM_MINORS); | 584 | devidx = find_first_zero_bit(dev_use, max_devices); |
570 | if (devidx >= MMC_NUM_MINORS) | 585 | if (devidx >= max_devices) |
571 | return ERR_PTR(-ENOSPC); | 586 | return ERR_PTR(-ENOSPC); |
572 | __set_bit(devidx, dev_use); | 587 | __set_bit(devidx, dev_use); |
573 | 588 | ||
@@ -584,7 +599,7 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) | |||
584 | */ | 599 | */ |
585 | md->read_only = mmc_blk_readonly(card); | 600 | md->read_only = mmc_blk_readonly(card); |
586 | 601 | ||
587 | md->disk = alloc_disk(1 << MMC_SHIFT); | 602 | md->disk = alloc_disk(perdev_minors); |
588 | if (md->disk == NULL) { | 603 | if (md->disk == NULL) { |
589 | ret = -ENOMEM; | 604 | ret = -ENOMEM; |
590 | goto err_kfree; | 605 | goto err_kfree; |
@@ -601,7 +616,7 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) | |||
601 | md->queue.data = md; | 616 | md->queue.data = md; |
602 | 617 | ||
603 | md->disk->major = MMC_BLOCK_MAJOR; | 618 | md->disk->major = MMC_BLOCK_MAJOR; |
604 | md->disk->first_minor = devidx << MMC_SHIFT; | 619 | md->disk->first_minor = devidx * perdev_minors; |
605 | md->disk->fops = &mmc_bdops; | 620 | md->disk->fops = &mmc_bdops; |
606 | md->disk->private_data = md; | 621 | md->disk->private_data = md; |
607 | md->disk->queue = md->queue.queue; | 622 | md->disk->queue = md->queue.queue; |
@@ -670,7 +685,6 @@ static int mmc_blk_probe(struct mmc_card *card) | |||
670 | { | 685 | { |
671 | struct mmc_blk_data *md; | 686 | struct mmc_blk_data *md; |
672 | int err; | 687 | int err; |
673 | |||
674 | char cap_str[10]; | 688 | char cap_str[10]; |
675 | 689 | ||
676 | /* | 690 | /* |
@@ -760,6 +774,11 @@ static int __init mmc_blk_init(void) | |||
760 | { | 774 | { |
761 | int res; | 775 | int res; |
762 | 776 | ||
777 | if (perdev_minors != CONFIG_MMC_BLOCK_MINORS) | ||
778 | pr_info("mmcblk: using %d minors per device\n", perdev_minors); | ||
779 | |||
780 | max_devices = 256 / perdev_minors; | ||
781 | |||
763 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); | 782 | res = register_blkdev(MMC_BLOCK_MAJOR, "mmc"); |
764 | if (res) | 783 | if (res) |
765 | goto out; | 784 | goto out; |