On 12.05.2016 20:20, Jammy Zhou wrote:
2016-05-12 17:39 GMT+08:00 Michel Dänzer <mic...@daenzer.net
<mailto:mic...@daenzer.net>>:
On 12.05.2016 17:58, Yu, Qiang wrote:
> Oh, what a crazy idea. So you mean it can work like this?
>
> 1. use the libgbm/gbm_dri/libEGL/libGLES from mesa which will load
> radeonsi_dri.so
>
> 2. libGL/amdgpu_dri.so from amdgpu-pro
glamor uses libEGL/GBM and libGL, so this could only work with Mesa's
libGL (or the GLVND one in the future). Can amdgpu_dri.so work with
Mesa's libGL right now?
I think amdgpu_dri.so is not completely compatible with Mesa's libGL
(considering some special feature requirements for amdgpu-pro and Mesa's
evolving). Another problem is that Mesa's libgbm cannot share necessary
buffer attributes (such as tiling info, etc) with amdgpu_dri.so at this
moment.
I think the long-term plan for such attributes is passing them via
amdgpu_bo_metadata (which is defined in libdrm's amdgpu.h). This
metadata is read and written directly through libdrm_amdgpu, and so
libgbm doesn't have to be involved as far as I can see.
Or is there some use-case that I'm forgetting where libgbm _does_ need
those attributes?
Cheers,
Nicolai
Also, I'm afraid there might still be cases where amdgpu-pro supports
new hardware before radeonsi, in which case amdgpu_dri.so needs to
support GBM for glamor and EGL in general.
IIRC radeonsi can support Southern Islands and later ASICs. I don't
think amdgpu-pro can support pre-GCN products easily, given current
amdgpu kernel driver support.
Also note that Nvidia developers were talking about possibly creating an
nvidia specific GBM backend recently on the wayland-devel mailing list.
Will nvidia open source their code for GBM backend?
--
Earthling Michel Dänzer | http://www.amd.com
Libre software enthusiast | Mesa and X developer
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