[PATCH] drm: add drm device name

[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?
> 
> 
> 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.


-- 
Earthling Michel Dänzer               |               https://redhat.com
Libre software enthusiast             |             Mesa and X developer