[PATCH v3 00/10] 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-rc4 as well as latest 
tip/master.

v3 changes:
* Patch 1 added to introduce the logical_core_id which is unique across
  the system (Prateek)
* Use the unique topology_logical_core_id() instead of
  topology_core_id() (which is only unique within a package on tested
  AMD and Intel systems) in Patch 10

v2 changes:
* Patches 6,7,8 added to split some changes out of the last patch
* Use container_of to get the rapl_pmus from event variable (Rui)
* Set PERF_EV_CAP_READ_ACTIVE_PKG flag only for pkg scope PMU (Rui)
* Use event id 0x1 for energy-per-core event (Rui)
* Use PERF_RAPL_PER_CORE bit instead of adding a new flag to check for
  per-core counter hw support (Rui)

Dhananjay Ugwekar (9):
  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 an argument to the cleanup and init functions
  perf/x86/rapl: Modify the generic variable names to *_pkg*
  perf/x86/rapl: Remove the global variable rapl_msrs
  perf/x86/rapl: Add per-core energy counter support for AMD CPUs

K Prateek Nayak (1):
  x86/topology: Introduce topology_logical_core_id()

 Documentation/arch/x86/topology.rst   |   4 +
 arch/x86/events/rapl.c                | 418 ++++++++++++++++++--------
 arch/x86/include/asm/processor.h      |   1 +
 arch/x86/include/asm/topology.h       |   1 +
 arch/x86/kernel/cpu/debugfs.c         |   1 +
 arch/x86/kernel/cpu/topology_common.c |   1 +
 6 files changed, 305 insertions(+), 121 deletions(-)

-- 
2.34.1