linux-kernel - Re: [PATCH v4 7/8] mmc: block: register RPMB partition with the RPMB subsystem

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Date:	Thu, 23 Jun 2016 09:17:52 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Tomas Winkler <tomas.winkler@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	"Martin K. Petersen" <martin.petersen@...cle.com>,
	Vinayak Holikatti <vinholikatti@...il.com>,
	Andy Lutomirski <luto@...nel.org>,
	Arve Hjønnevåg <arve@...roid.com>,
	Michael Ryleev <gmar@...gle.com>,
	Joao Pinto <Joao.Pinto@...opsys.com>,
	Christoph Hellwig <hch@....de>,
	Yaniv Gardi <ygardi@...eaurora.org>
Cc:	linux-kernel@...r.kernel.org, linux-mmc@...r.kernel.org,
	linux-scsi@...r.kernel.org,
	Alexander Usyskin <alexander.usyskin@...el.com>
Subject: Re: [PATCH v4 7/8] mmc: block: register RPMB partition with the RPMB
 subsystem

On 02/06/16 00:41, Tomas Winkler wrote:
> Register eMMC RPMB partition with the RPMB subsystem and provide
> implementation for the RPMB access operations abstracting
> actual multi step process.
> 
> V2: resend
> V3: commit message fix
> V4: Kconfig: use select RPMB to ensure valid configuration
>     Switch back to main area after RPMB access
> 
> Signed-off-by: Tomas Winkler <tomas.winkler@...el.com>
> Signed-off-by: Alexander Usyskin <alexander.usyskin@...el.com>
> ---

<SNIP>

> +static void mmc_blk_rpmb_add(struct mmc_card *card)
> +{
> +	struct mmc_blk_data *md = dev_get_drvdata(&card->dev);
> +	struct mmc_blk_data *part_md = mmc_blk_rpmb_part_get(md);
> +	struct rpmb_dev *rdev;
> +
> +	if (!part_md)
> +		return;
> +
> +	mmc_blk_rpmb_set_dev_id(&mmc_rpmb_dev_ops, card);
> +
> +	/* RPMB blocks are written in half sectors hence '* 2' */
> +	mmc_rpmb_dev_ops.reliable_wr_cnt = card->ext_csd.rel_sectors * 2;

This looks like it does not support 8KB writes added in v5.1 spec.  Can that
be supported?

> +
> +	rdev = rpmb_dev_register(disk_to_dev(part_md->disk),
> +				  &mmc_rpmb_dev_ops);
> +	if (IS_ERR(rdev)) {
> +		pr_warn("%s: cannot register to rpmb %ld\n",
> +			part_md->disk->disk_name, PTR_ERR(rdev));
> +	}
> +}

<SNIP>