[PATCH 0/6] Add per-core RAPL energy counter support for AMD CPUs

[Dhananjay Ugwekar <Dhananjay.Ugwekar@amd.com>]

Currently the energy-cores event in the power PMU aggregates energy
consumption data at a package level. On the other hand the core energy
RAPL counter in AMD CPUs has a core scope (which means the energy 
consumption is recorded separately for each core). Earlier efforts to add
the core event in the power PMU had failed [1], due to the difference in 
the scope of these two events. Hence, there is a need for a new core scope
PMU.

This patchset adds a new "power_per_core" PMU alongside the existing
"power" PMU, which will be responsible for collecting the new
"energy-per-core" event.

Tested the package level and core level PMU counters with workloads
pinned to different CPUs.

Results with workload pinned to CPU 1 in Core 1 on an AMD Zen4 Genoa 
machine:

$ perf stat -a --per-core -e power_per_core/energy-per-core/ sleep 1

 Performance counter stats for 'system wide':

S0-D0-C0         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C1         1          5.72 Joules power_per_core/energy-per-core/
S0-D0-C2         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C3         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C4         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C5         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C6         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C7         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C8         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C9         1          0.02 Joules power_per_core/energy-per-core/
S0-D0-C10        1          0.02 Joules power_per_core/energy-per-core/

[1]: https://lore.kernel.org/lkml/3e766f0e-37d4-0f82-3868-31b14228868d@linux.intel.com/

This patchset applies cleanly on top of v6.10-rc3 as well as latest 
tip/master.

Dhananjay Ugwekar (6):
  perf/x86/rapl: Fix the energy-pkg event for AMD CPUs
  perf/x86/rapl: Rename rapl_pmu variables
  perf/x86/rapl: Make rapl_model struct global
  perf/x86/rapl: Move cpumask variable to rapl_pmus struct
  perf/x86/rapl: Add wrapper for online/offline functions
  perf/x86/rapl: Add per-core energy counter support for AMD CPUs

 arch/x86/events/rapl.c | 311 ++++++++++++++++++++++++++++++-----------
 1 file changed, 233 insertions(+), 78 deletions(-)

-- 
2.34.1