linux-kernel - Re: [PATCH V12 2/2] scsi: ufs: Add configfs support for UFS provisioning

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Date:   Wed, 5 Sep 2018 15:35:36 +0530
From:   Sayali Lokhande <sayalil@...eaurora.org>
To:     Adrian Hunter <adrian.hunter@...el.com>, subhashj@...eaurora.org,
        cang@...eaurora.org, vivek.gautam@...eaurora.org,
        rnayak@...eaurora.org, vinholikatti@...il.com,
        jejb@...ux.vnet.ibm.com, martin.petersen@...cle.com,
        asutoshd@...eaurora.org, evgreen@...omium.org,
        riteshh@...eaurora.org
Cc:     stummala@...eaurora.org, jlbec@...lplan.org,
        linux-scsi@...r.kernel.org,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V12 2/2] scsi: ufs: Add configfs support for UFS
 provisioning


On 8/31/2018 12:42 PM, Adrian Hunter wrote:
> On 30/08/18 13:46, Sayali Lokhande wrote:
>> This patch adds configfs support to provision UFS device at
>> runtime. This feature can be primarily useful in factory or
>> assembly line as some devices may be required to be configured
>> multiple times during initial system development phase.
>> Configuration Descriptors can be written multiple times until
>> bConfigDescrLock attribute is zero.
>>
>> Configuration descriptor buffer consists of Device and Unit
>> descriptor configurable parameters which are parsed from vendor
>> specific provisioning file and then passed via configfs node at
>> runtime to provision ufs device.
>> CONFIG_CONFIGFS_FS and CONFIG_UFS_PROVISION needs to be enabled
>> for using this feature.
>>
>> Usage:
>> 1) To read current configuration descriptor with index X
>>     (where index X can be 0/1/2/3) :
>>     cat /config/XXXX.ufshc/ufs_config_desc_X
>>
>> 2) To write configuration descriptor with index X :
>>     echo <config_desc_buf> > /config/XXXX.ufshc/ufs_config_desc_X
>>
>> Signed-off-by: Sayali Lokhande <sayalil@...eaurora.org>
>> ---
> <SNIP>
>
>> +static struct configfs_attribute ufshcd_attr_provision_0 = {
> Actually, wasn't the original suggestion to use a binary attribute? i.e.
> configfs_bin_attribute
Yes. we did discuss about having binary attribute in between , but then 
it was thought if anyone who wants to use this interface from a shell 
script, it will be much easier to write multiple ASCII attributes than a 
single binary attribute.  It seemed more readable for users and 
easier/comfortable to compare any value to default spec value(if required).