linux-kernel - Re: [PATCH 2/2] mmc: mmc_test: use erase_arg for mmc

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Date:   Fri, 5 Feb 2021 10:05:21 +0100
From:   Yann GAUTIER <yann.gautier@...s.st.com>
To:     Adrian Hunter <adrian.hunter@...el.com>, <ulf.hansson@...aro.org>
CC:     <linux@...linux.org.uk>, <linus.walleij@...aro.org>,
        <ludovic.barre@...s.st.com>, <per.forlin@...aro.org>,
        <huyue2@...ong.com>, <wsa+renesas@...g-engineering.com>,
        <vbadigan@...eaurora.org>, <p.zabel@...gutronix.de>,
        <marex@...x.de>, <swboyd@...omium.org>,
        <linux-mmc@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mmc: mmc_test: use erase_arg for mmc_erase command

On 2/5/21 7:33 AM, Adrian Hunter wrote:
> On 4/02/21 2:05 pm, yann.gautier@...s.st.com wrote:
>> From: Yann Gautier <yann.gautier@...s.st.com>
>>
>> Since [1], the erase argument for mmc_erase() function is saved in
>> erase_arg field of card structure. It is preferable to use it instead of
>> hard-coded MMC_SECURE_ERASE_ARG, which from eMMC 4.51 spec is not
>> recommended:
>> "6.6.16 Secure Erase
>> NOTE Secure Erase is included for backwards compatibility. New system
>> level implementations (based on v4.51 devices and beyond) should use
>> Erase combined with Sanitize instead of secure erase."
>>
>>   [1] commit 01904ff77676 ("mmc: core: Calculate the discard arg only once")
>>
> 
> Did you experience an issue because of this?  You could add that to the
> commit message.

Hi Adrian,

Thanks for the review!
Yes, I've seen an issue on STM32MP157C-EV1 board.
After a write test (e.g. test 36), the tests 37 or 38, using mmc_erase 
fail. With the erase argument used by default in the framework 
(MMC_DISCARD_ARG), I can no more see this.

I can send a new version of the series with comment update here, and a 
fixup on the first patch.


Regards,
Yann

> 
> There does not seem to be a need for secure erase, so:
> 
> Acked-by: Adrian Hunter <adrian.hunter@...el.com>
> 
> 
>> Signed-off-by: Yann Gautier <yann.gautier@...s.st.com>
>> ---
>>   drivers/mmc/core/mmc_test.c | 2 +-
>>   1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/drivers/mmc/core/mmc_test.c b/drivers/mmc/core/mmc_test.c
>> index 39a478874ca3..63524551a13a 100644
>> --- a/drivers/mmc/core/mmc_test.c
>> +++ b/drivers/mmc/core/mmc_test.c
>> @@ -2110,7 +2110,7 @@ static int mmc_test_rw_multiple(struct mmc_test_card *test,
>>   	if (mmc_can_erase(test->card) &&
>>   	    tdata->prepare & MMC_TEST_PREP_ERASE) {
>>   		ret = mmc_erase(test->card, dev_addr,
>> -				size / 512, MMC_SECURE_ERASE_ARG);
>> +				size / 512, test->card->erase_arg);
>>   		if (ret)
>>   			ret = mmc_erase(test->card, dev_addr,
>>   					size / 512, MMC_ERASE_ARG);
>>
>