Message-ID: <5A3932BF.80106@nxp.com>
Date:   Tue, 19 Dec 2017 15:39:44 +0000
From:   Laurentiu Tudor <laurentiu.tudor@....com>
To:     Greg KH <gregkh@...uxfoundation.org>
CC:     Ruxandra Ioana Radulescu <ruxandra.radulescu@....com>,
        "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Bogdan Purcareata" <bogdan.purcareata@....com>,
        Leo Li <leoyang.li@....com>,
        "stuyoder@...il.com" <stuyoder@...il.com>,
        Roy Pledge <roy.pledge@....com>,
        "andrew@...n.ch" <andrew@...n.ch>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Stuart Yoder <stuart.yoder@....com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Jason Cooper <jason@...edaemon.net>,
        Marc Zyngier <marc.zyngier@....com>
Subject: Re: [PATCH v4] staging: fsl-mc: move bus driver out of staging

On 12/19/2017 05:29 PM, Greg KH wrote:
> On Tue, Dec 19, 2017 at 03:21:19PM +0000, Laurentiu Tudor wrote:
>>
>>
>> On 12/19/2017 04:48 PM, Greg KH wrote:
>>> On Wed, Nov 29, 2017 at 12:08:44PM +0200, laurentiu.tudor@....com wrote:
>>>> From: Stuart Yoder <stuart.yoder@....com>
>>>>
>>>> Move the source files out of staging into their final locations:
>>>>     -include files in drivers/staging/fsl-mc/include go to include/linux/fsl
>>>>     -irq-gic-v3-its-fsl-mc-msi.c goes to drivers/irqchip
>>>>     -source in drivers/staging/fsl-mc/bus goes to drivers/bus/fsl-mc
>>>>     -README.txt, providing and overview of DPAA goes to
>>>>      Documentation/dpaa2/overview.txt
>>>>
>>>> Update or delete other remaining staging files-- Makefile, Kconfig, TODO.
>>>> Update dpaa2_eth and dpio staging drivers.
>>>>
>>>> Signed-off-by: Stuart Yoder <stuyoder@...il.com>
>>>> Signed-off-by: Laurentiu Tudor <laurentiu.tudor@....com>
>>>> [Laurentiu: rebased, add dpaa2_eth and dpio #include updates]
>>>> Cc: Thomas Gleixner <tglx@...utronix.de>
>>>> Cc: Jason Cooper <jason@...edaemon.net>
>>>> Cc: Marc Zyngier <marc.zyngier@....com>
>>>> ---
>>>> Notes:
>>>>       -v4:
>>>>         - regenerated patch with renames detection disabled (Andrew Lunn)
>>>>       -v3:
>>>>         - rebased
>>>
>>> Ok, meta-comments on the structure of the code.
>>>
>>> You have 8 .h files that are "private" to your bus logic.  That's 7 too
>>> many, some of them have a bigger license header than actual content :)
>>>
>>> Please consolidate into 1.
>>>
>>> Also, the headers should be moved to SPDX format to get rid of the
>>> boilerplate.  I _think_ it's BSD/GPL, right?  Hard to tell :(
>>
>> It's 3-clause BSD and GPLv2. Will make it clear when moving to SPDX.
>
> Thanks.
>
>>> Your "public" .h file does not need to go into a subdirectory, just name
>>> it fsl-mc.h and put it in include/linux/.
>>
>> There's already a "fsl" subdirectory in include/linux/ so it seemed to
>> make sense to use it.
>
> Ah, missed that.  Ok, nevermind :)`
>
>>> One comment on the fields in your .h file, all of the user/kernel
>>> crossing boundry structures need to use the "__" variant of types, like
>>> "__u8" and the like.  You mix and match them for some reason, you need
>>> to be consistent.
>>>
>>> Also, what's up with the .h files in drivers/staging/fsl-bus/include?
>>> You didn't touch those with this movement, right?  Why?
>>
>> Those are not part of the bus "core". Some of them are part of the DPBP
>> and DPCON device types APIs and are used by drivers probing on this bus
>> and the rest are part of the DPIO driver which is also used by other
>> drivers. Since these devices (DPBP, DPCON, DPIO) are interfaces used by
>> all the other drivers it made sense to group them together with the bus.
>
> But all of these .h files are only used by the code in this specific
> directory, no where else.

They are also used by our ethernet driver, see:
   drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.h

> So just mush them all together, having
> individual .h files doesn't really help anyone here, right?  It's just
> more files for no good reason.  And, it might help you see if you really
> need all of the info in those files :)

Ok, I'll try to come up with something that reduces the number of header 
files.

>>> For this initial move, only move the bus "core" code out, not the other
>>> stuff like:
>>>
>>>>    drivers/irqchip/Makefile                           |   1 +
>>>>    drivers/irqchip/irq-gic-v3-its-fsl-mc-msi.c        | 119 +++
>>>
>>> these should be a separate file move, right?
>>
>> This bus uses msi interrupts and this file contains glue code needed to
>> enable interrupts in the GICv3 irqchip. Without this I don't think the
>> bus driver can work because itself makes use of interrupts.
>
> How is this all working today?  Just leave the non-bus code alone, and
> move the irqchip code as a separate patch.

Ok, i can do this.

>>>>    drivers/staging/fsl-dpaa2/ethernet/README          |   2 +-
>>>
>>> Why does a README file for a different driver need to be touched?
>>
>> It mentions a file in the old location of the bus. This is how the diff
>> looks:
>>
>> -       drivers/staging/fsl-mc/README.txt
>> +       Documentation/dpaa2/overview.txt
>
> Ah.
>
>>>>    drivers/staging/fsl-dpaa2/ethernet/dpaa2-eth.c     |   2 +-
>>>>    drivers/staging/fsl-dpaa2/ethernet/dpni.c          |   2 +-
>>>>    drivers/staging/fsl-mc/README.txt                  | 386 ---------
>>>
>>> This file gets moved to the Documentation directory, yet it is not tied
>>> into the documentation build process, that's not good.
>>
>> Will look into that.
>>
>>> It doesn't need to have a separate directory either, right?
>>
>> Agreed, maybe the destination directory isn't the best choice. Maybe
>> bus-devices/fsl-mc.txt makes more sense? Can you please suggest?
>
> It should be in .rst format, and tied into the documentation build
> somehow, I don't really know where new stuff is going, you should look
> at recent changes in that directory for more examples.

Ok, will do.

---
Thanks & Best Regards, Laurentiu

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