linux-kernel - Re: [v4,4/8] char: rpmb: provide user space interface

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Date:	Thu, 2 Jun 2016 15:44:57 +0200
From:	Jérôme Forissier <jerome.forissier@...aro.org>
To:	"Winkler, Tomas" <tomas.winkler@...el.com>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Ulf Hansson <ulf.hansson@...aro.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	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
Subject: Re: [v4,4/8] char: rpmb: provide user space interface

Hi Tomas,

On 06/01/2016 11:41 PM, Winkler, Tomas wrote:
> The user space API is achieved via single synchronous IOCTL.
> The request is submitted in in_frames_ptr pointer and received
> in out_frames_ptr.

I like this, because it's exactly what I wish existed when I wrote the
eMMC RPMB back-end for OP-TEE secure storage [1] ;-)

Same goes for patch 5/8 "char: rpmb: add RPMB simulation device": with
this I could just drop my custom simulation layer.

So, this goes in the right direction IMHO.

[1]
https://github.com/OP-TEE/optee_client/blob/master/tee-supplicant/src/rpmb.c

-- 
Jerome