linux-kernel - Re: [PATCH RESEND v7 2/2] mmc: card: Adding support for sanitize in eMMC 4.5

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Date:	Thu, 19 Jul 2012 04:25:20 -0700 (PDT)
From:	merez@...eaurora.org
To:	"Chris Ball" <cjb@...top.org>
Cc:	"Yaniv Gardi" <ygardi@...eaurora.org>, linux-mmc@...r.kernel.org,
	merez@...eaurora.org, linux-arm-msm@...r.kernel.org,
	"open list" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH RESEND v7 2/2] mmc: card: Adding support for sanitize 
     in eMMC 4.5

On Wed, July 18, 2012 11:46 pm, Chris Ball wrote:
> Hi Yaniv,
>
> On Thu, Jun 28 2012, Yaniv Gardi wrote:
>> This feature delete the unmap memory region of the eMMC card,
>> by writing to a specific register in the EXT_CSD
>> unmap region is the memory region that were previously deleted
>> (by erase, trim or discard operation)
>>
>> Signed-off-by: Yaniv Gardi <ygardi@...eaurora.org>
>
> Did you reply to Chuanxiao's review comments yet?  He said:
>
> "So to implement your scenario, how about only add
> mmc_blk_issue_sanitize_rq() for REQ_SANITIZE but not touch
> mmc_blk_issue_secdiscard_rq()? With your changes in
> mmc_blk_issue_secdiscard_rq(), eMMC4.5 device will be failed to operate
> secure trim/erase for REQ_SECURE request."
>
> at: http://thread.gmane.org/gmane.linux.kernel.mmc/14822/focus=14880
>
> Thanks,
>
> - Chris.
> --
> Chris Ball   <cjb@...top.org>   <http://printf.net/>
> One Laptop Per Child
>

Secure trim and secure erase were removed from eMMC4.5. Please refer to
annex B at B.6 section in eMMC4.5 spec.
Therefore, failure upon trying to do secure trim/erase is the expected
behavior for eMMC4.5 devices.

Thanks,
Maya
-- 
Sent by consultant of Qualcomm Innovation Center, Inc.
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum

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