[PATCH v7 0/2] perf/x86/power: Introduce AMD accumlated power reporting mechanism

[Huang Rui <ray.huang@amd.com>]

Hi,

This series of patches introduces the perf implementation of
accumulated power reporting algorithm. It will calculate the average
power consumption for the processor. The CPU feature flag is
CPUID.8000_0007H:EDX[12].

The V7 is rebased on bp/tip-perf. And need two dependent patches at
tip because of modular perf driver:
http://git.kernel.org/tip/675965b00d734c985e4285f5bec7e524d15fc4e1
http://git.kernel.org/tip/3712bba1a260ad851f3aa8ddea9cb7326f6aa0b3


Changes from v1 -> v2:
- Add a patch to fix the build issue which is reported by kbuild test
  robot.

Changes from v2 -> v3:
- Use raw_spinlock_t instead of spinlock_t, because it need meet the
  -rt mode use case.
- Use topology_sibling_cpumask to make the cpumask operation easier.

Changes from v3 -> v4:
- Remove active_list, because it is not iterated.
- Capitalize sentences consistently and fix some typos.
- Fix some code style issues.
- Initialize structures in a vertically aligned manner.
- Remove unnecessary comment.
- Fix the runtime bug, and do some testing on CPU-hotplug scenario.

Changes from v4 -> v5:
- Remove "struct pmu" and lock from power_pmu, and rename it to
  power_pmu_masks
- As Peter's suggestion, add a new struct to hw_perf_event, and track
  these values from per-event.

Changes from v5 -> v6:
- Remove MAX_CUS check
- Remove DEFINE_PER_CPU(struct power_pmu_masks *, amd_power_pmu)
- Remove power_cpu_prepare power_cpu_free and refine power_cpu_init
  and power_cpu_exit
- Use smp_num_siblings instead of cores_per_cu variable.
- Make this driver as a module.
- Add a patch to export events_sysfs_show.

Changes from v6 -> v7:
- Remove unnecessary cu_num.
- Remove unnecessary initialization for target as nr_cpumask_bits.
- Refine power_cpu_init interface.
- Handle CPU_DOWN_FAILED case.
- Remove unnecessary tmp variable.
- Re-write the initialization of for_each_online_cpu(cpu) loop.
- Move __register_cpu_notifier after perf_pmu_register.

Thanks,
Rui

Huang Rui (2):
  perf/x86: Export events_sysfs_show()
  perf/x86/amd/power: Add AMD accumulated power reporting mechanism

 arch/x86/Kconfig                           |   9 +
 arch/x86/kernel/cpu/Makefile               |   1 +
 arch/x86/kernel/cpu/perf_event.c           |   1 +
 arch/x86/kernel/cpu/perf_event_amd_power.c | 353 +++++++++++++++++++++++++++++
 include/linux/perf_event.h                 |   4 +
 5 files changed, 368 insertions(+)
 create mode 100644 arch/x86/kernel/cpu/perf_event_amd_power.c

-- 
1.9.1