[Mesa-dev] [Bug 103586] OpenCL/Clover: AMD Turks: corrupt output buffer (depending on dimension order?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103586

--- Comment #8 from Jan Vesely <jan.vesely at rutgers.edu> ---
(In reply to Dave Gilbert from comment #6)
> (In reply to Jan Vesely from comment #5)
> > (In reply to Dave Gilbert from comment #4)
> > > Created attachment 135313 [details]
> > > foo.link-0.ll
> > > 
> > > That's all 3 of the debug files it produced.
> > > (I wasn't sure which were the llvm and which the isa dumps; I guess the asm
> > > is the isa? and the ll's are both llvm dumps?)
> > 
> > yes. the first .ll is from compilation step, the other one is from linking
> > step.
> > 
> > .ll dump looks correct.
> > .asm also looks correct.
> > 
> > you can try producing multiple asm dumps for working and non-working runs.
> > But I don't think that the llvm is the culprit here.
> > 
> > Can you try waiting for the kernel execution to complete explicitly before
> > mapping the buffer?
> > Ideally call clFinish() on line 63.
> 
> Since I'm on the C++ binding (probably a mistake) I used:
>   queue.finish();
> 
> and it seems to be working.
> 
> (This also corresponds possibly to what I'm seeing on a more complex kernel;
> with a more complex kernel I'm seeing on a whole pile of data on the last
> few Z slices as being bogus suggesting it's not finished).
> 
> Dave

thanks for testing. I see you are using mesa 17.2.

there were few changes to blocking call synchronization that went to mesa 17.3:
02f8ac6b70033a1b240d497c4664c359d2398cc3 (clover: Wrap event::wait_count in a
method taking care of the required locking.)
bc4000ee40c78efe1e5e8a6244d4bb55389d8418 (clover: Run the associated action
before an event is signalled.)
3a5b69c09ba355c616c274b0c7f5aba3bd21fd54 (clover: Wait for requested operation
if blocking flag is set)

which might help address the issue. Can you test mesa 17.3?

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