[PATCH] drm: add drm device name

[Daniel Vetter]

On Tue, Sep 17, 2019 at 11:27 AM Michel Dänzer <michel at daenzer.net> wrote:
>
> On 2019-09-17 11:23 a.m., Michel Dänzer wrote:
> > On 2019-09-17 10:23 a.m., Koenig, Christian wrote:
> >> Am 17.09.19 um 10:17 schrieb Daniel Vetter:
> >>> On Tue, Sep 17, 2019 at 10:12 AM Christian König
> >>> <ckoenig.leichtzumerken at gmail.com> wrote:
> >>>> Am 17.09.19 um 07:47 schrieb Jani Nikula:
> >>>>> On Mon, 16 Sep 2019, Marek Olšák <maraeo at gmail.com> wrote:
> >>>>>> The purpose is to get rid of all PCI ID tables for all drivers in
> >>>>>> userspace. (or at least stop updating them)
> >>>>>>
> >>>>>> Mesa common code and modesetting will use this.
> >>>>> I'd think this would warrant a high level description of what you want
> >>>>> to achieve in the commit message.
> >>>> And maybe explicitly call it uapi_name or even uapi_driver_name.
> >>> If it's uapi_name, then why do we need a new one for every generation?
> >>> Userspace drivers tend to span a lot more than just 1 generation. And
> >>> if you want to have per-generation data from the kernel to userspace,
> >>> then imo that's much better suited in some amdgpu ioctl, instead of
> >>> trying to encode that into the driver name.
> >>
> >> Well we already have an IOCTL for that, but I thought the intention here
> >> was to get rid of the PCI-ID tables in userspace to figure out which
> >> driver to load.
> >
> > That's just unrealistic in general, I'm afraid. See e.g. the ongoing
> > transition from i965 to iris for recent Intel hardware. How is the
> > kernel supposed to know which driver is to be used?
> >
> >
> > For the Xorg modesetting driver, there's a simple solution, see
> > https://gitlab.freedesktop.org/xorg/xserver/merge_requests/278 .
> > Something similar can probably be done in Mesa as well.
>
> Another possibility might be for Xorg to use
> https://www.khronos.org/registry/EGL/extensions/MESA/EGL_MESA_query_driver.txt
> to determine the driver name. Then only Mesa might need any HW specific
> code.

How are other compositors solving this? I don't expect they have a
pciid table like modesetting copied to all of them ...
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
+41 (0) 79 365 57 48 - http://blog.ffwll.ch