[Bug 82581] New: CL_DEVICE_MAX_COMPUTE_UNITS increases by 100 every time runpm powers on 7970M pitcairn

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=82581

            Bug ID: 82581
           Summary: CL_DEVICE_MAX_COMPUTE_UNITS increases by 100 every
                    time runpm powers on 7970M pitcairn
           Product: Drivers
           Version: 2.5
    Kernel Version: 3.16.1
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: haagch.christoph@googlemail.com
        Regression: No

01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI]
Wimbledon XT [Radeon HD 7970M] (rev ff)

linux 3.16.1

drmCommandWriteRead() in mesa receives the wrong value already so I put this
here.

As long as the gpu is not powered off in between runs the value stays the same.
When the gpu is powered off and on, the value will be increased by 100.

Test program output:

$ g++ numcomp.cpp -o numcomp -lOpenCL; ./numcomp; ./numcomp; sleep 10;
./numcomp; ./numcomp
OpenCL Number of compute units: 7500
OpenCL Number of compute units: 7500
OpenCL Number of compute units: 7600
OpenCL Number of compute units: 7600


Test program source:

#include <CL/cl.hpp>
#include <iostream>
int main() {
  int err, numberOfComputeUnits = 0;
  std::vector<cl::Platform> platformList;
  cl::Platform::get(&platformList);
  cl_context_properties cprops[3] = { CL_CONTEXT_PLATFORM,
(cl_context_properties) (platformList[0])(), 0 };
  cl::Context *context = new cl::Context(CL_DEVICE_TYPE_GPU, cprops, NULL,
NULL, &err);
  std::vector<cl::Device> devices = context->getInfo<CL_CONTEXT_DEVICES>();
  devices[0].getInfo(CL_DEVICE_MAX_COMPUTE_UNITS, &numberOfComputeUnits);
  std::cout << "OpenCL Number of compute units: " << numberOfComputeUnits <<
std::endl;;
  return 0;
}


Also with other tools like http://graphics.stanford.edu/~yoel/notes/clInfo.c:
$ ./clInfo | grep MAX_COMPUTE_UNITS
        device[0x1118288]: MAX_COMPUTE_UNITS: 10400

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