linux-kernel - Re: UFS utilities

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Date:   Tue, 5 Dec 2017 15:44:19 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>
CC:     Bart Van Assche <Bart.VanAssche@....com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "vinholikatti@...il.com" <vinholikatti@...il.com>
Subject: Re: UFS utilities

Hi, greg k-h

>
>So what UFS commands are you missing that you need to see implemented?
>
>And again, have you checked the different forks of the driver?
>

Seems there is something misunderstood, I want to use UPIU, rather than CDB.
Maybe it is not possible based on current UFS stacks. Of course, exactly, 
there is no missing SCSI command listed in UFS 2.1.

>> >> And also it doesn't support several UFS special command.
>> >
>> >Are you referring to SCSI commands or rather to UFS commands that
>> >fall outside the SCSI spec? Anyway, an approach that is used by many
>> >SCSI drivers to export information to user space that falls outside
>> >the SCSI spec is to create additional sysfs attributes. See also the
>> >sdev_attrs and shost_attrs members of struct scsi_host_template.
>> >
>> Yes, for the UFS information, I can use these interface/approach to easily
>get.
>> I am thinking how about some testing case and configuration operation.
>
>Which ones exactly?
>
>> Also, is it possible bypass SCSI stacks and go into directly UFS stack?
>
>Look at the different sysfs files for the UFS device, it does that for some
>commands.
>
To be honest, I don't know which interface, it can pass UPIU to UFS driver,
And bypass SCSI stacks.

Thanks.
Bean Huo