Date:   Wed, 28 Sep 2016 15:46:11 -0700
From:   subhashj@...eaurora.org
To:     Joao Pinto <Joao.Pinto@...opsys.com>
Cc:     Kiwoong Kim <kwmad.kim@...sung.com>,
        'Shaun Tancheff' <shaun.tancheff@...gate.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-scsi-owner@...r.kernel.org,
        Carlos Palminha <CARLOS.PALMINHA@...opsys.com>
Subject: Re: UFS API in the kernel

On 2016-09-28 02:57, Joao Pinto wrote:
> I was able to get the 7 patches to have the UFS IOCTL features from 
> your repo.
> BTW, why weren't these features submitted to the kernel?
> I checked lots of tweaks that you have been making to the UFS... do you
> synchronize them periodically with the mainline? Thanks!

We had mainlined quite a lot UFS patches in past and I am also planning 
to push out the remaining deltas to mainline over next couple of months. 
Thanks.

> 
> On 9/28/2016 10:19 AM, Joao Pinto wrote:
>> 
>> Hi again!
>> Could you also send me an example of how you are using the IOCTL from 
>> your user
>> app (send/receive data)? I already have my implemented but you use a 
>> different
>> mechanism (I have checked your structures in uapi/scsi/ufs/) and I 
>> have to port
>> it! Thanks!
>> 
>> 
>> On 9/28/2016 10:06 AM, Joao Pinto wrote:
>>> 
>>> Hi Subhash,
>>> 
>>> On 9/28/2016 12:05 AM, subhashj@...eaurora.org wrote:
>>>> Hi Joao,
>>>> 
>>>> 
>>>> On 2016-09-26 18:10, Kiwoong Kim wrote:
>>>>> Hi.
>>>>> 
>>>>> If you want to declare some things for user interface,
>>>>> is it be better to put those thing include/uapi/linux/ than 
>>>>> include/linux?
>>>>> 
>>>>> Agreed with Mr. Pinto's opinion with respect to implementing 
>>>>> additional ioctls.
>>>> 
>>>> Yes, "scsi_host_template" allows the LLD's to export their ioctl 
>>>> callback and
>>>> then you can use the sg interface to issue UFS specific ioctls. We 
>>>> had
>>>> implemented similar ioctl for our use, here is the reference code:
>>>> https://source.codeaurora.org/quic/la/kernel/msm-3.18/tree/drivers/scsi/ufs/ufshcd.c?h=LA.HB.1.1.1.c2#n6791.
>>>> This was mainly done to  export the UFS query request interface to 
>>>> user space.
>>>> Declarations where exported under include/uapi/scsi/ufs/ . If you 
>>>> want to build
>>>> upon this already existing functionality, i can post the formal 
>>>> patch on mailing
>>>> list.
>>> 
>>> Yes, of course I have interest on building on top of what you have 
>>> done already.
>>> Did yu submit this patch to the kernel already? Could you please send 
>>> me the
>>> patch and kernel version to apply?
>>> 
>>> Thanks,
>>> Joao
>>> 
>>>> 
>>>> Regards,
>>>> Subhash
>>>> 
>>>> 
>>>>> 
>>>>> Regards.
>>>>> 
>>>>>> -----Original Message-----
>>>>>> From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-
>>>>>> owner@...r.kernel.org] On Behalf Of Shaun Tancheff
>>>>>> Sent: Tuesday, September 27, 2016 4:23 AM
>>>>>> To: Joao Pinto
>>>>>> Cc: linux-scsi@...r.kernel.org; linux-kernel@...r.kernel.org
>>>>>> Subject: Re: UFS API in the kernel
>>>>>> 
>>>>>> On Thu, Sep 22, 2016 at 10:21 AM, Joao Pinto 
>>>>>> <Joao.Pinto@...opsys.com>
>>>>>> wrote:
>>>>>>> Hi!
>>>>>>> 
>>>>>>> I am designing an application that has the goal to be an utility 
>>>>>>> for
>>>>>>> Unipro and UFS testing purposes. This application is going to run 
>>>>>>> on
>>>>>>> top of a recent Linux Kernel containing the new UFS stack 
>>>>>>> (including the
>>>>>> new DWC drivers).
>>>>>>> 
>>>>>>> I am considering doing the following:
>>>>>>> a) Create a new config item called CONFIG_UFS_CHARDEV which is 
>>>>>>> going
>>>>>>> to create a char device responsible to make some IOCTL available 
>>>>>>> for
>>>>>>> user-space applications
>>>>>>> b) Create a linux/ufs.h header file that contains data structures
>>>>>>> declarations that will be needed in user-space applications
>>>>>> 
>>>>>> I am not very familiar with UFS devices, that said you should have 
>>>>>> an sgX
>>>>>> chardev being created already so you can handle SG_IO requests.
>>>>>> There also appear to be some sysfs entries being created.
>>>>>> 
>>>>>> So between sg and sysfs you should be able to handle any 
>>>>>> user-space out of
>>>>>> band requests without resorting to making a new chardev.
>>>>>> 
>>>>>> Adding more sysfs entries, if you need them, should be fine.
>>>>>> 
>>>>>> You may find it easier to expand on the existing interfaces than 
>>>>>> to get
>>>>>> consensus on a new driver and ioctls.
>>>>>> 
>>>>>> Hope this helps,
>>>>>> Shaun
>>>>>> 
>>>>>>> Could you please advise me about what the correct approach should 
>>>>>>> be
>>>>>>> to make it as standard as possible and usable in the future?
>>>>>>> 
>>>>>>> Thank you very much for your help!
>>>>>>> 
>>>>>>> regards,
>>>>>>> Joao
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>>>>>> 
>>>>>> 
>>>>>> 
>>>>>> --
>>>>>> Shaun Tancheff
>>>>>> --
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>>>>> 
>>>>> 
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> 
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