[PATCH v2 0/5] Re-enable IMC trace-mode

[Anju T Sudhakar]

commit <249fad734a25> ""powerpc/perf: Disable trace_imc pmu"               
disables IMC(In-Memory Collection) trace-mode in kernel, since frequent       
mode switching between accumulation mode and trace mode via the spr LDBAR  
in the hardware can trigger a checkstop(system crash).

This patch series re-enables IMC trace mode and fixes the mode switching
issue by global lock mechanism.

Patch 3/5,4/5 and 5/5 provides a selftest to verify the global-lock
mechanism.

Changes from v1 -> v2:
-------------------------
- Added self test patches to the series.

Anju T Sudhakar (2):
  powerpc/powernv: Re-enable imc trace-mode in kernel
  powerpc/perf: Implement a global lock to avoid races between trace,
    core and thread imc events.

Madhavan Srinivasan (3):
  powerpc/perf: Add an interface sub-folder to imc pmu
  selftest/powerpc/pmc: Support to include interface test for Memory
    Counter PMUs
  selftest/powerpc/pmu: Testcase for imc global lock mechanism


 arch/powerpc/include/asm/imc-pmu.h            |  11 +-
 arch/powerpc/perf/imc-pmu.c                   | 196 +++++++++++++++---
 arch/powerpc/platforms/powernv/opal-imc.c     |   9 +-
 tools/testing/selftests/powerpc/pmu/Makefile  |   7 +-
 .../powerpc/pmu/mem_counters/Makefile         |  21 ++
 .../pmu/mem_counters/imc_global_lock_test.c   |  68 ++++++
 .../powerpc/pmu/mem_counters/mem_counters.c   |  99 +++++++++
 .../powerpc/pmu/mem_counters/mem_counters.h   |  36 ++++
 8 files changed, 408 insertions(+), 39 deletions(-)
 create mode 100644 tools/testing/selftests/powerpc/pmu/mem_counters/Makefile
 create mode 100644 tools/testing/selftests/powerpc/pmu/mem_counters/imc_global_lock_test.c
 create mode 100644 tools/testing/selftests/powerpc/pmu/mem_counters/mem_counters.c
 create mode 100644 tools/testing/selftests/powerpc/pmu/mem_counters/mem_counters.h

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2.18.1