[PATCH] drm: add drm device name

[Marek Olšák]

drmVersion::name = amdgpu, radeon, intel, etc.
drmVersion::desc = vega10, vega12, vega20, ...

The common Mesa code will use name and desc to select the driver.

The AMD-specific Mesa code will use desc to identify the chip.

Mesa won't receive any PCI IDs for future chips.

Marek


On Tue, Sep 17, 2019 at 10:33 AM Michel Dänzer <michel at daenzer.net> wrote:

> On 2019-09-17 1:20 p.m., Christian König wrote:
> > Am 17.09.19 um 11:27 schrieb Michel Dänzer:
> >> 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?
> >
> > Well how is userspace currently handling that? The kernel should NOT say
> > which driver to use in userspace, but rather which one is used in the
> > kernel.
>
> Would that really help though? E.g. the radeon kernel driver supports
> radeon/r200/r300/r600/radeonsi DRI drivers, the i915 one i915/i965/iris
> (and the amdgpu one radeonsi/amdgpu).
>
> The HW generation identifier proposed in these patches might be useful,
> but I suspect there'll always be cases where userspace needs to know
> more precisely.
>
>
> > Mapping that information to an userspace driver still needs to be done
> > somewhere else, but the difference is that you don't need to add all
> > PCI-IDs twice.
>
> It should only really be necessary in Mesa.
>
>
> On 2019-09-17 1:32 p.m., Daniel Vetter wrote:
> > How are other compositors solving this? I don't expect they have a
> > pciid table like modesetting copied to all of them ...
>
> They don't need any of this. The Xorg modesetting driver only did for
> determining the client driver name to advertise via the DRI2 extension.
>
>
> --
> Earthling Michel Dänzer               |               https://redhat.com
> Libre software enthusiast             |             Mesa and X developer
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