Bug 94012

Summary:

Tonga OpenCL clpeak vm faults

Product:

DRI

Reporter:

Andy Furniss <adf.lists>

Component:

DRM/AMDgpu

Assignee:

Default DRI bug account <dri-devel>

Status:

RESOLVED FIXED

QA Contact:

Severity:

normal

Priority:

medium

Version:

DRI git

Hardware:

Other

OS:

All

Whiteboard:

i915 platform:

i915 features:

Attachments:

Description	Flags
vm debug	none
compute shaders .bz2	none

Description Andy Furniss 2016-02-05 18:29:44 UTC

Created attachment 121540 [details]
vm debug

R9285 llvm,mesa,libclc yesterdays gits.

No ideea if this is a regression as I've only just noticed tonga got added to libclc so this is first time testing OpenCL.

clpeak - https://github.com/krrishnarraj/clpeak.git

produces vmfaults. It will run to completion.

R600_DEBUG=check_vm ./clpeak 

Platform: Clover
  Device: AMD TONGA (DRM 3.1.0, LLVM 3.9.0)
    Driver version  : 11.2.0-devel (Linux x64)
    Compute units   : 28
    Clock frequency : 0 MHz

    Global memory bandwidth (GBPS)
      float   : 1.45
      float2  : 1.44
      float4  : 1.45
      float8  : 1.45
      float16 : Detected a VM fault, exiting...

Attaching output and vm debug file from 

R600_DEBUG=check_vm,cs ./clpeak &>~/clpeak-cs

Comment 1 Andy Furniss 2016-02-05 18:30:59 UTC

Created attachment 121541 [details]
compute shaders .bz2

Comment 2 Andy Furniss 2016-03-31 15:14:31 UTC

fixed by llvm commit

commit d3adac51fcce66e8c79b77299fef9e5f6c4c646e
Author: Tom Stellard <thomas.stellard@amd.com>
Date:   Wed Mar 30 16:35:09 2016 +0000

    AMDGPU/SI: Enable lanemask tracking in misched
    
    Summary:
    This results in higher register usage, but should make it easier for
    the compiler to hide latency.
    
    This pass is a prerequisite for some more scheduler improvements, and I
    think the increase register usage with this patch is acceptable, because
    when combined with the scheduler improvements, the total register usage
    will decrease.
    
    shader-db stats:
    
    2382 shaders in 478 tests
    Totals:
    SGPRS: 48672 -> 49088 (0.85 %)
    VGPRS: 34148 -> 34847 (2.05 %)
    Code Size: 1285816 -> 1289128 (0.26 %) bytes
    LDS: 28 -> 28 (0.00 %) blocks
    Scratch: 492544 -> 573440 (16.42 %) bytes per wave
    Max Waves: 6856 -> 6846 (-0.15 %)
    Wait states: 0 -> 0 (0.00 %)
    
    Depends on D18451
    
    Reviewers: nhaehnle, arsenm
    
    Subscribers: arsenm, llvm-commits
    
    Differential Revision: http://reviews.llvm.org/D18452
    
    git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@264876 91177308-0d34-0410-b5e6-96231b3b80d8

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