Radeon LLVM GPU Back-End Stripped From Mesa

[phoronix]

Phoronix: Radeon LLVM GPU Back-End Stripped From Mesa

The R600 LLVM back-end for the Radeon Gallium3D driver was removed from Mesa...

http://www.phoronix.com/vr.php?view=MTI2OTE

[Veerappan]

Phoronix: Radeon LLVM GPU Back-End Stripped From Mesa

The R600 LLVM back-end for the Radeon Gallium3D driver was removed from Mesa...

http://www.phoronix.com/vr.php?view=MTI2OTE

And a good thing this is. If this had not happened, we'd have 3 different R600 LLVM back-ends to choose from when writing code. Mesa's R600 back-end, Tom's LLVM tree, or the upstream LLVM repository. Any fixes/improvements would have to be synchronized between all 3 repositories.

Now we're down to 2 repositories, and I believe that Tom has committed to handling the upstreaming of fixes based on his tree to the upstream LLVM project.

[kernelOfTruth]

And a good thing this is. If this had not happened, we'd have 3 different R600 LLVM back-ends to choose from when writing code. Mesa's R600 back-end, Tom's LLVM tree, or the upstream LLVM repository. Any fixes/improvements would have to be synchronized between all 3 repositories.

Now we're down to 2 repositories, and I believe that Tom has committed to handling the upstreaming of fixes based on his tree to the upstream LLVM project.

well, it's great that we have llvm for radeon

but there's 2 (or some more - haven't tested more than that) main issues I'm facing with it when for my daily work:

I'm running compiz 0.8* (0.9* is unstable for me and it's also not as fast & stable as 0.8* - at least for me)


- the exposé-like feature leads to a black screen

- likewise with the zoom feature

if anyone of the devs is reading here along - could you try to reproduce and see if there's a fix for that ?

(I'm using llvm from Tom's repo via FireBurn overlay with Gentoo)


afaik at the beginning when I started testing it some videoplayback (via smplayer) or even flash (in chromium) also didn't work -> black content


thanks !

[Eisnefaust]

Typical case of mild form of idocracy ;-) At least MESA should have left the code within their codebase as long as LLVM hasn't the backend officially ...

[kernelOfTruth]

it seems to improve now:

when triggering the exposé-like feature (vortex animation is selected) for a short second I can see the background - then the screen turns black


also switching desktops via ctrl + alt + arrow (left, right, up, down) also leads to a black screen - when the animation has ended the desktop is viewable again


when zooming in (using the "zoom" feature) the mouse-cursor is still viewable - not sure if it was there before



definitely things seem to be improving

thanks devs !


in the past when I first wanted to try out llvm upon launch of X (lightdm) the screen was totally black - so there's been lots of progress

[vljn]

it seems to improve now:

when triggering the exposé-like feature (vortex animation is selected) for a short second I can see the background - then the screen turns black


also switching desktops via ctrl + alt + arrow (left, right, up, down) also leads to a black screen - when the animation has ended the desktop is viewable again


when zooming in (using the "zoom" feature) the mouse-cursor is still viewable - not sure if it was there before

Which card do you have ? Maybe compiz is triggering a bug not covered by piglit.

[kernelOfTruth]

Which card do you have ? Maybe compiz is triggering a bug not covered by piglit.

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cypress PRO [Radeon HD 5800 Series]
01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cypress HDMI Audio [Radeon HD 5800 Series]

01:00.0 VGA compatible controller: Advanced Micro Devices [AMD] nee ATI Cypress PRO [Radeon HD 5800 Series] (prog-if 00 [VGA controller])
Subsystem: Advanced Micro Devices [AMD] nee ATI Device 0b00
Flags: bus master, fast devsel, latency 0, IRQ 49
Memory at d0000000 (64-bit, prefetchable) [size=256M]
Memory at fbde0000 (64-bit, non-prefetchable) [size=128K]
I/O ports at c000 [size=256]
Expansion ROM at fbdc0000 [disabled] [size=128K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: radeon

01:00.1 Audio device: Advanced Micro Devices [AMD] nee ATI Cypress HDMI Audio [Radeon HD 5800 Series]
Subsystem: Advanced Micro Devices [AMD] nee ATI Cypress HDMI Audio [Radeon HD 5800 Series]
Flags: bus master, fast devsel, latency 0, IRQ 48
Memory at fbdbc000 (64-bit, non-prefetchable) [size=16K]
Capabilities: [50] Power Management version 3
Capabilities: [58] Express Legacy Endpoint, MSI 00
Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010 <?>
Capabilities: [150] Advanced Error Reporting
Kernel driver in use: snd_hda_intel

[ 63.900] (--) RADEON(0): Chipset: "ATI Radeon HD 5800 Series" (ChipID = 0x6899)

please let me know if you need more information

[agd5f]

It's much easier to diagnose the problem is you file a bug report (https://bugs.freedesktop.org) and attach your xorg log and dmesg output.

[kernelOfTruth]

It's much easier to diagnose the problem is you file a bug report (https://bugs.freedesktop.org) and attach your xorg log and dmesg output.

sure, will do

I'll give it another try within the next days and post the corresponding logs

thanks !

[kernelOfTruth]

It's much easier to diagnose the problem is you file a bug report (https://bugs.freedesktop.org) and attach your xorg log and dmesg output.

https://bugs.freedesktop.org/show_bug.cgi?id=61446

if you need more info - just ask