linux-kernel - Re: [RFC PATCH 0/4] DirectX on Linux

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Date:   Tue, 16 Jun 2020 16:41:22 +0200
From:   Pavel Machek <pavel@...x.de>
To:     Sasha Levin <sashal@...nel.org>
Cc:     Thomas Zimmermann <tzimmermann@...e.de>, alexander.deucher@....com,
        chris@...is-wilson.co.uk, ville.syrjala@...ux.intel.com,
        Hawking.Zhang@....com, tvrtko.ursulin@...el.com,
        linux-kernel@...r.kernel.org, linux-hyperv@...r.kernel.org,
        kys@...rosoft.com, haiyangz@...rosoft.com, sthemmin@...rosoft.com,
        wei.liu@...nel.org, spronovo@...rosoft.com, iourit@...rosoft.com,
        dri-devel@...ts.freedesktop.org, linux-fbdev@...r.kernel.org,
        gregkh@...uxfoundation.org
Subject: Re: [RFC PATCH 0/4] DirectX on Linux

On Tue 2020-06-16 09:28:19, Sasha Levin wrote:
> On Tue, Jun 16, 2020 at 12:51:13PM +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > > The driver creates the /dev/dxg device, which can be opened by user mode
> > > > application and handles their ioctls. The IOCTL interface to the driver
> > > > is defined in dxgkmthk.h (Dxgkrnl Graphics Port Driver ioctl
> > > > definitions). The interface matches the D3DKMT interface on Windows.
> > > > Ioctls are implemented in ioctl.c.
> > > 
> > > Echoing what others said, you're not making a DRM driver. The driver should live outside
> > > of the DRM code.
> > > 
> > 
> > Actually, this sounds to me like "this should not be merged into linux kernel". I mean,
> > we already have DRM API on Linux. We don't want another one, do we?
> 
> This driver doesn't have any display functionality.

Graphics cards without displays connected are quite common. I may be
wrong, but I believe we normally handle them using DRM...

> > And at the very least... this misses API docs for /dev/dxg. Code can't really
> > be reviewed without that.
> 
> The docs live here: https://docs.microsoft.com/en-us/windows-hardware/drivers/ddi/d3dkmthk/

I don't see "/dev/dxg" being metioned there. Plus, kernel API
documentation should really go to Documentation, and be suitably
licensed.
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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