BUG / design challenge: vmwgfx + PRIME handle free == clobbering errno

[Xaver Hugl]

Am Mi., 10. Jan. 2024 um 01:28 Uhr schrieb Zack Rusin <
zack.rusin at broadcom.com>:

> On Tue, Jan 9, 2024 at 11:06 AM Xaver Hugl <xaver.hugl at kde.org> wrote:
> >
> > Hi,
> >
> > KWin does use DRM_CLIENT_CAP_CURSOR_PLANE_HOTSPOT.
>
> Can you point me to the code that implements it? Just wanted to take a
> quick look, because I didn't see the cursor on KDE 6 after fixing the
> kernel oops.
>
It's here:
https://invent.kde.org/plasma/kwin/-/blob/a879c59a082707e0e7dfa8ebeb7b239551ec9c71/src/backends/drm/drm_gpu.cpp#L153

> > Tying the check to
> > DRM_CLIENT_CAP_ATOMIC instead would IMO make more sense though (even if
> it's
> > still weird) and would work with older versions of KWin and other
> compositors.
>
> Unfortunately xf86-video-modesetting advertises CLIENT_CAP_ATOMIC and
> uses GL where our GL driver assumes the prime object is not GEM. Not
> impossible, as mentioned before, we can always add code to the kernel
> that handles both but I don't think there's any particularly clean
> solutions here. We'll probably play with a few solutions and see which
> one is the cleanest.
>
> z
>

Ah, that's unfortunate.
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