linux-kernel - Re: [PATCH v1 8/9] drivers: hv: dxgkrnl: Implement various WDDM ioctls

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Date:   Fri, 14 Jan 2022 18:16:03 -0800
From:   Iouri Tarassov <iourit@...ux.microsoft.com>
To:     Greg KH <gregkh@...uxfoundation.org>
Cc:     kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, linux-hyperv@...r.kernel.org,
        linux-kernel@...r.kernel.org, spronovo@...rosoft.com
Subject: Re: [PATCH v1 8/9] drivers: hv: dxgkrnl: Implement various WDDM
 ioctls


On 1/13/2022 9:38 PM, Greg KH wrote:
> On Thu, Jan 13, 2022 at 04:19:41PM -0800, Iouri Tarassov wrote:
> > 
> > On 1/12/2022 11:47 PM, Greg KH wrote:
> > > On Wed, Jan 12, 2022 at 11:55:13AM -0800, Iouri Tarassov wrote:
> > > > Implement various WDDM IOCTLs.
> > > > Again, break this up into smaller pieces.  Would you want to review
> > > all
> > > of these at the same time?
> > > 
> > > Remember, you write code for people to review and understand first, and
> > > the compiler second.  With large changes like this, you are making it
> > > difficult for people to review, which is your target audience.
> > > 
> > > I'll stop here, please fix up this patch series into something that is
> > > reviewable.
> > 
> > Hi Greg,
> > 
> > https://www.kernel.org/doc/html/latest/process/submitting-patches.html
> > states that "only post say 15 [patches] or so at a time and wait for review
> > and integration".
> > The IOCTLs here are simple and I tried to keep the number of patches smaller
> > than 15. Is it ok to have more than 15 patches in a submission, or I need to
> > submit the driver is several chunks (some of which would be not fully
> > functional)?
>
> We get patch series that are much longer all the time, that's fine.  How
> many do you feel would be needed to properly break this out?

Hi Greg,

I think there could be 20-25 patches.

Implementation of many IOCTLs follow the same pattern:
- add the IOCTL definition to the ioctl table
- implement a function to send the corresponding VM bus message to the host
- implement a function to handle the IOCTL input data, call the function to send
message to the host and copy results back to the caller.

I tried to combine several such implementations to a single patch.
I think the patch is logically simple and it would be easy to review.

What is your opinion?

Thanks
Iouri