diff options
author | Johan Rudholm <johan.rudholm@stericsson.com> | 2011-12-02 07:51:06 (GMT) |
---|---|---|
committer | Chris Ball <cjb@laptop.org> | 2012-01-12 04:58:43 (GMT) |
commit | add710eaa88606de8ba98a014d37178579e6dbaf (patch) | |
tree | 2d719508cabd213d5923cef95fdd3d6c9c40d977 /drivers/mmc/card/block.c | |
parent | 92df954df3422a7dcf99eea34cf4cb68bb06ea08 (diff) | |
download | linux-fsl-qoriq-add710eaa88606de8ba98a014d37178579e6dbaf.tar.xz |
mmc: boot partition ro lock support
Enable boot partitions to be read-only locked until next power on via
a sysfs entry. There will be one sysfs entry for each boot partition:
/sys/block/mmcblkXbootY/ro_lock_until_next_power_on
Each boot partition is locked by writing 1 to its file.
Signed-off-by: Johan Rudholm <johan.rudholm@stericsson.com>
Signed-off-by: John Beckett <john.beckett@stericsson.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/mmc/card/block.c')
-rw-r--r-- | drivers/mmc/card/block.c | 121 |
1 files changed, 113 insertions, 8 deletions
diff --git a/drivers/mmc/card/block.c b/drivers/mmc/card/block.c index ad0fb8d..0c959c9 100644 --- a/drivers/mmc/card/block.c +++ b/drivers/mmc/card/block.c @@ -107,6 +107,8 @@ struct mmc_blk_data { */ unsigned int part_curr; struct device_attribute force_ro; + struct device_attribute power_ro_lock; + int area_type; }; static DEFINE_MUTEX(open_lock); @@ -165,6 +167,70 @@ static void mmc_blk_put(struct mmc_blk_data *md) mutex_unlock(&open_lock); } +static ssize_t power_ro_lock_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + int ret; + struct mmc_blk_data *md = mmc_blk_get(dev_to_disk(dev)); + struct mmc_card *card = md->queue.card; + int locked = 0; + + if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PERM_WP_EN) + locked = 2; + else if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_EN) + locked = 1; + + ret = snprintf(buf, PAGE_SIZE, "%d\n", locked); + + return ret; +} + +static ssize_t power_ro_lock_store(struct device *dev, + struct device_attribute *attr, const char *buf, size_t count) +{ + int ret; + struct mmc_blk_data *md, *part_md; + struct mmc_card *card; + unsigned long set; + + if (kstrtoul(buf, 0, &set)) + return -EINVAL; + + if (set != 1) + return count; + + md = mmc_blk_get(dev_to_disk(dev)); + card = md->queue.card; + + mmc_claim_host(card->host); + + ret = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_BOOT_WP, + card->ext_csd.boot_ro_lock | + EXT_CSD_BOOT_WP_B_PWR_WP_EN, + card->ext_csd.part_time); + if (ret) + pr_err("%s: Locking boot partition ro until next power on failed: %d\n", md->disk->disk_name, ret); + else + card->ext_csd.boot_ro_lock |= EXT_CSD_BOOT_WP_B_PWR_WP_EN; + + mmc_release_host(card->host); + + if (!ret) { + pr_info("%s: Locking boot partition ro until next power on\n", + md->disk->disk_name); + set_disk_ro(md->disk, 1); + + list_for_each_entry(part_md, &md->part, part) + if (part_md->area_type == MMC_BLK_DATA_AREA_BOOT) { + pr_info("%s: Locking boot partition ro until next power on\n", part_md->disk->disk_name); + set_disk_ro(part_md->disk, 1); + } + } + + mmc_blk_put(md); + return count; +} + static ssize_t force_ro_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -1347,7 +1413,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, struct device *parent, sector_t size, bool default_ro, - const char *subname) + const char *subname, + int area_type) { struct mmc_blk_data *md; int devidx, ret; @@ -1372,11 +1439,12 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, if (!subname) { md->name_idx = find_first_zero_bit(name_use, max_devices); __set_bit(md->name_idx, name_use); - } - else + } else md->name_idx = ((struct mmc_blk_data *) dev_to_disk(parent)->private_data)->name_idx; + md->area_type = area_type; + /* * Set the read-only status based on the supported commands * and the write protect switch. @@ -1470,7 +1538,8 @@ static struct mmc_blk_data *mmc_blk_alloc(struct mmc_card *card) size = card->csd.capacity << (card->csd.read_blkbits - 9); } - md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL); + md = mmc_blk_alloc_req(card, &card->dev, size, false, NULL, + MMC_BLK_DATA_AREA_MAIN); return md; } @@ -1479,13 +1548,14 @@ static int mmc_blk_alloc_part(struct mmc_card *card, unsigned int part_type, sector_t size, bool default_ro, - const char *subname) + const char *subname, + int area_type) { char cap_str[10]; struct mmc_blk_data *part_md; part_md = mmc_blk_alloc_req(card, disk_to_dev(md->disk), size, default_ro, - subname); + subname, area_type); if (IS_ERR(part_md)) return PTR_ERR(part_md); part_md->part_type = part_type; @@ -1518,7 +1588,8 @@ static int mmc_blk_alloc_parts(struct mmc_card *card, struct mmc_blk_data *md) card->part[idx].part_cfg, card->part[idx].size >> 9, card->part[idx].force_ro, - card->part[idx].name); + card->part[idx].name, + card->part[idx].area_type); if (ret) return ret; } @@ -1547,9 +1618,16 @@ mmc_blk_set_blksize(struct mmc_blk_data *md, struct mmc_card *card) static void mmc_blk_remove_req(struct mmc_blk_data *md) { + struct mmc_card *card; + if (md) { + card = md->queue.card; if (md->disk->flags & GENHD_FL_UP) { device_remove_file(disk_to_dev(md->disk), &md->force_ro); + if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && + card->ext_csd.boot_ro_lockable) + device_remove_file(disk_to_dev(md->disk), + &md->power_ro_lock); /* Stop new requests from getting into the queue */ del_gendisk(md->disk); @@ -1578,6 +1656,7 @@ static void mmc_blk_remove_parts(struct mmc_card *card, static int mmc_add_disk(struct mmc_blk_data *md) { int ret; + struct mmc_card *card = md->queue.card; add_disk(md->disk); md->force_ro.show = force_ro_show; @@ -1587,7 +1666,33 @@ static int mmc_add_disk(struct mmc_blk_data *md) md->force_ro.attr.mode = S_IRUGO | S_IWUSR; ret = device_create_file(disk_to_dev(md->disk), &md->force_ro); if (ret) - del_gendisk(md->disk); + goto force_ro_fail; + + if ((md->area_type & MMC_BLK_DATA_AREA_BOOT) && + card->ext_csd.boot_ro_lockable) { + mode_t mode; + + if (card->ext_csd.boot_ro_lock & EXT_CSD_BOOT_WP_B_PWR_WP_DIS) + mode = S_IRUGO; + else + mode = S_IRUGO | S_IWUSR; + + md->power_ro_lock.show = power_ro_lock_show; + md->power_ro_lock.store = power_ro_lock_store; + md->power_ro_lock.attr.mode = mode; + md->power_ro_lock.attr.name = + "ro_lock_until_next_power_on"; + ret = device_create_file(disk_to_dev(md->disk), + &md->power_ro_lock); + if (ret) + goto power_ro_lock_fail; + } + return ret; + +power_ro_lock_fail: + device_remove_file(disk_to_dev(md->disk), &md->force_ro); +force_ro_fail: + del_gendisk(md->disk); return ret; } |