[Mesa-dev] Initial amdgpu driver release

[Emil Velikov]

On 21/04/15 16:41, Alex Deucher wrote:
> On Tue, Apr 21, 2015 at 11:56 AM, Emil Velikov <emil.l.velikov at gmail.com> wrote:
>> Hi Alex,
>>
>> On 20 April 2015 at 23:33, Alex Deucher <alexdeucher at gmail.com> wrote:
>>> I'm pleased to announce the initial release of the new amdgpu driver.
>>> This is a partial replacement for the radeon driver for newer AMD
>>> asics.  A number of components are still shared.  Here is a comparison
>>> of the radeon and amdgpu stacks:
>>>
>>> 1. radeon stack
>>> kernel driver: radeon.ko
>>> libdrm: libdrm_radeon
>>> mesa: radeon, r200, r300, r600, radeonsi
>>> ddx: xf86-video-ati
>>>
>>> 2. amdgpu stack
>>> kernel driver: amdgpu.ko
>>> libdrm: libdrm_amdgpu
>>> mesa: radeonsi
>>> ddx: xf86-video-amdgpu
>>>
>>> Older asics will continue to be supported by the radeon stack; new
>>> asics will be supported by the amdgpu stack.  CI (Sea Islands) asics
>>> have support in both driver stacks, but this is purely for testing
>>> purposes.  CI parts are officially supported in the radeon stack.
>>> Support for CI on the amdgpu stack is determined by a config option in
>>> the kernel.  CI support is not enabled by default for amdgpu.
>>>
>>> Most of our focus has been on Carrizo support, so there are some gaps
>>> in the dGPU support for Tonga and Iceland, notably power management.
>>> Those gaps will be filled in eventually.
>>>
>>> Also included in this code base are full register headers for just
>>> about every block on the asics.
>>>
>>> Barring the gaps mentioned above, the driver stack is functionally on
>>> par with radeon including:
>>> - OpenGL 3.3 support using the radeonsi mesa driver
>>> - Video decode support using UVD
>>> - Video encode support using VCE
>>>
>>> The code can be found in the amdgpu branches of the following git trees.
>>> xf86-video-amdgpu:
>>> http://cgit.freedesktop.org/~agd5f/xf86-video-amdgpu/log/?h=amdgpu
>>> libdrm:
>>> http://cgit.freedesktop.org/~agd5f/drm/log/?h=amdgpu
>>> kernel:
>>> http://cgit.freedesktop.org/~agd5f/linux/log/?h=amdgpu
>>> mesa:
>>> http://cgit.freedesktop.org/~mareko/mesa/log/?h=amdgpu
>>>
>>> To test the new driver stack you will need to specify a device section
>>> in your xorg.conf with the driver set to amdgpu rather than radeon.
>>>
>>> Please review!
>>>
>> Do you plan to sending out the libdrm patches to the ML ? I have a few
>> comments that you might be interested in :-)
> 
> Yeah, just sent them out now.  Ran out of time last night.  Some of
> the patches in the kernel and the ddx patch are really big so probably
> too big for the ML.
> 
Fair enough, did not mean to come out as impatient - was the first thing
that pope at my email client after a short break.

Just a random question on the ddx front - do you see many benefits of
supporting old xservers ? If you target xserver 1.16 and later you can
drop a fair bit of code/wrappers
 - Non DRI2 enabled xserver.
 - HAS_DEVPRIVATEKEYREC (new with 1.10, released 4+ years ago)
 - xorg-list (new with 1.12, released 3+ years ago)
 - DRI2_PRIME (new with 1.13, released 2+ years ago)
 - AMDGPU_PIXMAP_SHARING (XF86_CRTC_VERSION >= 5, new with 1.13)
 - Support for external the glamor library (new with 1.16)

While you're there you might want to drop support for xextproto pre 7.1.
7.1.0 was released 6+ years ago.

The README and .gitignore mention xf86-video-ati.

Hope you find any of the above useful :)

-Emil