[Bug 70779] New: OpenCL hangs with big kernels

[Bug 70779] New: OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

          Priority: medium
            Bug ID: 70779
          Assignee: dri-devel@lists.freedesktop.org
           Summary: OpenCL hangs with big kernels
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mustrumr97@gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Drivers/Gallium/radeonsi
           Product: Mesa

Radeon 7870 XT.
A 50-word kernel works, a 67-word one hangs. Other tests confirm this.
See bug 60879

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

--- Comment #1 from Hristo Venev <mustrumr97@gmail.com> ---
Bump.

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

--- Comment #2 from Hristo Venev <mustrumr97@gmail.com> ---
Bump.

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

EoD <EoD@xmw.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |EoD@xmw.de

--- Comment #3 from EoD <EoD@xmw.de> ---
Do you have an example of such a kernel?

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

--- Comment #4 from Hristo Venev <mustrumr97@gmail.com> ---
Here are two kernels that fail:
__kernel void uint_div(__global const uint *a,  __global const uint *b,
__global uint *c){
    c[0]=a[0]/b[0];
}
__kernel void uint_add16(__global const uint *a,  __global const uint *b,
__global uint *c){
    for(uint i=0;i<16;i++) c[i]=a[i]+b[i];
}

This one works:
__kernel void uint_add(__global const uint *a,  __global const uint *b,
__global uint *c){
    c[0]=a[0]+b[0];
}

Sadly I don't have access to the hardware anymore (it's probably in a dump
somewhere).

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

--- Comment #5 from EoD <EoD@xmw.de> ---
Created attachment 121742
  --> https://bugs.freedesktop.org/attachment.cgi?id=121742&action=edit
dmesg after running the uint_add16() kernel

(In reply to Hristo Venev from comment #4)
> Here are two kernels that fail:
> __kernel void uint_div(__global const uint *a,  __global const uint *b,
> __global uint *c){
>     c[0]=a[0]/b[0];
> }
> __kernel void uint_add16(__global const uint *a,  __global const uint *b,
> __global uint *c){
>     for(uint i=0;i<16;i++) c[i]=a[i]+b[i];
> }

I actually can confirm that the 2nd kernel does cause a GPU stall in the radeon
driver (r600/Barts). It causes no problem with amdgpu (radeonsi/Tonga).

I am using kernel 4.5.0-rc3, current llvm 3.8 branch and current mesa git.

As I am not overly good with OpenCL, is this kernel somehow problematic?

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
 Attachment #121742|text/x-log                  |text/plain
          mime type|                            |

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

--- Comment #6 from Michel Dänzer <michel@daenzer.net> ---
I think this is probably a duplicate of bug 60879 and that it was basically
luck that "small kernels" didn't hang on Hristo's card.

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[Bug 70779] OpenCL hangs with big kernels

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https://bugs.freedesktop.org/show_bug.cgi?id=70779

Vedran Miletić <vedran@miletic.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |DUPLICATE
             Status|NEW                         |RESOLVED

--- Comment #7 from Vedran Miletić <vedran@miletic.net> ---
(In reply to EoD from comment #5)
> I actually can confirm that the 2nd kernel does cause a GPU stall in the
> radeon driver (r600/Barts). It causes no problem with amdgpu
> (radeonsi/Tonga).
> 
> I am using kernel 4.5.0-rc3, current llvm 3.8 branch and current mesa git.
> 
> As I am not overly good with OpenCL, is this kernel somehow problematic?

EoD, if these stalls on r600 are still reproducible, please open a separate
bug.

*** This bug has been marked as a duplicate of bug 60879 ***

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