tree 875ad75a562a78b98d0910973356e62b3013e924
parent fc17d5276b38fc7c2f239585f7614350490490b0
author Sean Christopherson <seanjc@google.com> 1709766112 -0800
committer Sean Christopherson <seanjc@google.com> 1717620089 -0700

x86/pmu: Test adaptive PEBS without any adaptive counters

If adaptive PEBS is supported, verify that only basic PEBS records are
generated for counters without their ADAPTIVE flag set.  Per the SDM,
adaptive records are generated if and only if both the per-counter flag
*and* the global enable(s) in MSR_PEBS_DATA_CFG are set.

  IA32_PERFEVTSELx.Adaptive_Record[34]: If this bit is set and
  IA32_PEBS_ENABLE.PEBS_EN_PMCx is set for the corresponding GP counter,
  an overflow of PMCx results in generation of an adaptive PEBS record
  with state information based on the selections made in MSR_PEBS_DATA_CFG.
  If this bit is not set, a basic record is generated.

and

  IA32_FIXED_CTR_CTRL.FCx_Adaptive_Record: If this bit is set and
  IA32_PEBS_ENABLE.PEBS_EN_FIXEDx is set for the corresponding Fixed
  counter, an overflow of FixedCtrx results in generation of an adaptive
  PEBS record with state information based on the selections made in
  MSR_PEBS_DATA_CFG. If this bit is not set, a basic record is generated.

Reviewed-by: Like Xu <likexu@tencent.com>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Tested-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://lore.kernel.org/r/20240306230153.786365-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>