linux-kernel - Re: [PATCH v4] scsi: ufs: Make sysfs attributes writable

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Message-ID: <20180927140133.GA22096@infradead.org>
Date:   Thu, 27 Sep 2018 07:01:33 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Avri Altman <Avri.Altman@....com>
Cc:     Evan Green <evgreen@...omium.org>,
        Doug Anderson <dianders@...omium.org>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>,
        Vinayak Holikatti <vinholikatti@...il.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        Stanislav Nijnikov <Stanislav.Nijnikov@....com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Bart Van Assche <Bart.VanAssche@....com>,
        "adrian.hunter@...el.com" <adrian.hunter@...el.com>,
        sayali <sayalil@...eaurora.org>
Subject: Re: [PATCH v4] scsi: ufs: Make sysfs attributes writable

On Thu, Sep 27, 2018 at 06:32:47AM +0000, Avri Altman wrote:
> Also, in this context there is the series in 
> https://www.spinics.net/lists/linux-scsi/msg123479.html
> which allows to send UPIUs via a bsg device.
> 
> It's not a provisioning series per-se like Evan's and Sayali's.
> It covers the provisioning functionality,
> But also allow to send task management UPIU, and UIC commands,
> Which can be used for testing and validation.

And as someone having been involved with review of a few different
UFS provisioning bits this is what I think we should be merging.

Instead of being in a rat race of adding ever new sysfs or configfs
attributes for things that don't matter to normal driver operation
I'd rather have a relatively clean pass through interface and move
policy to userspace.  Especially given that there are plenty of
vendor specific commands at these levels as well.