[Bug 78453] [HAWAII] Get acceleration working

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=78453

--- Comment #74 from Konstantin <ernestoguevara at gmx.net> ---
First, sorry for being away so long.

(In reply to comment #69)
> First of all, let me remind both of you to make sure si_get_backend_mask()
> gets the information from the kernel, and to use my patch which disables
> tiling as much as possible for now.
Ok, but how do I make sure that si_get_backend_mask() gets information from the
kernel ?

(In reply to comment #69)
> Also, might be worth testing with R600_DEBUG=nodma for now, to prevent the
> userspace code from using the asynchronous DMA engine.
Will do that.

(In reply to comment #69)
> That's all it's supposed to do, FWIW. :)
I guessed as much :-) I actually was quite excited that it worked.

(In reply to comment #69)
> Does it work if you add EGL_DRIVER=egl_dri2 ?
Unfortunately that didn't work. As output I get (note best driver is DRI2
instead of gallium):
# EGL_LOG_LEVEL=debug EGL_PLATFORM=drm EGL_DRIVER=egl_dri2 ./egltri_screen
    libEGL debug: Native platform type: drm (environment overwrite)
    libEGL debug: EGL search path is /usr/lib64/egl
    libEGL debug: added egl_dri2 to module array
    libEGL debug: the best driver is DRI2
    EGL_VERSION = 1.4 (DRI2)
    libEGL debug: attribute 0x3033 has an invalid value 0x8
    libEGL debug: EGL user error 0x3004 (EGL_BAD_ATTRIBUTE) in eglChooseConfig
    EGLUT: failed to choose a config

But on recent mesa it works again without EGL_DRIVER.

(In reply to comment #69)
> I'm afraid it's still too early to test in X. Even without -retro, the GPU
> is probably used for some operations via glamor, e.g. for the cursor image.
Well, I just tested again on yesterdays mesa (2014-06-22) and vanilla kernel
3.16-rc2 (no patches, cause I had problems on rc1). egltri_screen still works
once, then I get garbage, that now looks different (lots of small dots).

I also tried eglgears_screen, but that segfaults. I guess it's a problem in
llvm - and unfortunately llvm refuses to build for about 2 weeks now.
Output is:

LLVM triggered Diagnostic Handler: unsupported call to function
llvm.AMDGPU.rsq. in main
[  621.798733] traps: eglgears_screen[431] general protection ip:7f0cb3ae51d8
sp:7fffe17cfa10 error:0 in libLLVM-3.5svn.so[7f0cb2b35000+1af1000]
Segmentation fault

Next I'll try to get the kernel patches for disabling tiling running again and
use R600_DEBUG=nodma. Do I have to do anything about si_get_backend_mask() ?

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