Commit dc913385 authored by Dmitry Osipenko's avatar Dmitry Osipenko Committed by Jens Axboe
Browse files

mmc: block: Support alternative_gpt_sector() operation 



Support generic alternative_gpt_sector() block device operation.
It calculates location of GPT entry for eMMC of NVIDIA Tegra Android
devices. Add new MMC_CAP2_ALT_GPT_TEGRA flag that enables scanning of
alternative GPT sector and add raw_boot_mult field to mmc_ext_csd
which allows to get size of the boot partitions that is needed for
the calculation.

Signed-off-by: default avatarDmitry Osipenko <digetx@gmail.com>
Reviewed-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20210820004536.15791-4-digetx@gmail.com


Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 466d9c49

drivers/mmc/core/block.c

+21 −0
Original line number Original line Diff line number Diff line
@@ -831,6 +831,26 @@ static int mmc_blk_compat_ioctl(struct block_device *bdev, fmode_t mode, 
}

}

#endif

#endif





static int mmc_blk_alternative_gpt_sector(struct gendisk *disk,

					  sector_t *sector)

{

	struct mmc_blk_data *md;

	int ret;



	md = mmc_blk_get(disk);

	if (!md)

		return -EINVAL;



	if (md->queue.card)

		ret = mmc_card_alternative_gpt_sector(md->queue.card, sector);

	else

		ret = -ENODEV;



	mmc_blk_put(md);



	return ret;

}



static const struct block_device_operations mmc_bdops = {

static const struct block_device_operations mmc_bdops = {

	.open			= mmc_blk_open,

	.open			= mmc_blk_open,

	.release		= mmc_blk_release,

	.release		= mmc_blk_release,
@@ -840,6 +860,7 @@ static const struct block_device_operations mmc_bdops = { 
#ifdef CONFIG_COMPAT

#ifdef CONFIG_COMPAT

	.compat_ioctl		= mmc_blk_compat_ioctl,

	.compat_ioctl		= mmc_blk_compat_ioctl,

#endif

#endif

	.alternative_gpt_sector	= mmc_blk_alternative_gpt_sector,

};

};





static int mmc_blk_part_switch_pre(struct mmc_card *card,

static int mmc_blk_part_switch_pre(struct mmc_card *card,

drivers/mmc/core/core.c

+35 −0
Original line number Original line Diff line number Diff line
@@ -2149,6 +2149,41 @@ int mmc_detect_card_removed(struct mmc_host *host) 
}

}

EXPORT_SYMBOL(mmc_detect_card_removed);

EXPORT_SYMBOL(mmc_detect_card_removed);





int mmc_card_alternative_gpt_sector(struct mmc_card *card, sector_t *gpt_sector)

{

	unsigned int boot_sectors_num;



	if ((!(card->host->caps2 & MMC_CAP2_ALT_GPT_TEGRA)))

		return -EOPNOTSUPP;



	/* filter out unrelated cards */

	if (card->ext_csd.rev < 3 ||

	    !mmc_card_mmc(card) ||

	    !mmc_card_is_blockaddr(card) ||

	     mmc_card_is_removable(card->host))

		return -ENOENT;



	/*

	 * eMMC storage has two special boot partitions in addition to the

	 * main one.  NVIDIA's bootloader linearizes eMMC boot0->boot1->main

	 * accesses, this means that the partition table addresses are shifted

	 * by the size of boot partitions.  In accordance with the eMMC

	 * specification, the boot partition size is calculated as follows:

	 *

	 *	boot partition size = 128K byte x BOOT_SIZE_MULT

	 *

	 * Calculate number of sectors occupied by the both boot partitions.

	 */

	boot_sectors_num = card->ext_csd.raw_boot_mult * SZ_128K /

			   SZ_512 * MMC_NUM_BOOT_PARTITION;



	/* Defined by NVIDIA and used by Android devices. */

	*gpt_sector = card->ext_csd.sectors - boot_sectors_num - 1;



	return 0;

}

EXPORT_SYMBOL(mmc_card_alternative_gpt_sector);



void mmc_rescan(struct work_struct *work)

void mmc_rescan(struct work_struct *work)

{

{

	struct mmc_host *host =

	struct mmc_host *host =

drivers/mmc/core/core.h

+2 −0
Original line number Original line Diff line number Diff line
@@ -119,6 +119,8 @@ void mmc_release_host(struct mmc_host *host); 
void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx);

void mmc_get_card(struct mmc_card *card, struct mmc_ctx *ctx);

void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx);

void mmc_put_card(struct mmc_card *card, struct mmc_ctx *ctx);





int mmc_card_alternative_gpt_sector(struct mmc_card *card, sector_t *sector);



/**

/**

 *	mmc_claim_host - exclusively claim a host

 *	mmc_claim_host - exclusively claim a host

 *	@host: mmc host to claim

 *	@host: mmc host to claim

drivers/mmc/core/mmc.c

+2 −0
Original line number Original line Diff line number Diff line
@@ -418,6 +418,8 @@ static int mmc_decode_ext_csd(struct mmc_card *card, u8 *ext_csd) 
		ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];

		ext_csd[EXT_CSD_ERASE_TIMEOUT_MULT];

	card->ext_csd.raw_hc_erase_grp_size =

	card->ext_csd.raw_hc_erase_grp_size =

		ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];

		ext_csd[EXT_CSD_HC_ERASE_GRP_SIZE];

	card->ext_csd.raw_boot_mult =

		ext_csd[EXT_CSD_BOOT_MULT];

	if (card->ext_csd.rev >= 3) {

	if (card->ext_csd.rev >= 3) {

		u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];

		u8 sa_shift = ext_csd[EXT_CSD_S_A_TIMEOUT];

		card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];

		card->ext_csd.part_config = ext_csd[EXT_CSD_PART_CONFIG];

include/linux/mmc/card.h

+1 −0
Original line number Original line Diff line number Diff line
@@ -109,6 +109,7 @@ struct mmc_ext_csd { 
	u8			raw_hc_erase_gap_size;	/* 221 */

	u8			raw_hc_erase_gap_size;	/* 221 */

	u8			raw_erase_timeout_mult;	/* 223 */

	u8			raw_erase_timeout_mult;	/* 223 */

	u8			raw_hc_erase_grp_size;	/* 224 */

	u8			raw_hc_erase_grp_size;	/* 224 */

	u8			raw_boot_mult;		/* 226 */

	u8			raw_sec_trim_mult;	/* 229 */

	u8			raw_sec_trim_mult;	/* 229 */

	u8			raw_sec_erase_mult;	/* 230 */

	u8			raw_sec_erase_mult;	/* 230 */

	u8			raw_sec_feature_support;/* 231 */

	u8			raw_sec_feature_support;/* 231 */