[PATCH v3 00/10] hwmon: (fam15h_power) Introduce an accumulated power reporting algorithm

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

Hi all,

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

This algorithm is used to test the comparison of processor power
consumption with between MWAITX delay and TSC delay on AMD Carrizo
platforms.

Reference:
http://marc.info/?l=linux-kernel&m=143874573111310&w=2

Commit f96756 at tip ("x86/asm: Add MONITORX/MWAITX instruction support")
Commit b466bd at tip ("x86/asm/delay: Introduce an MWAITX-based delay with a configurable timer")

V1: http://marc.info/?l=linux-kernel&m=144066380613299&w=2
V2: http://marc.info/?l=linux-kernel&m=144531018518473&w=2

Changes from v1 -> v2:
- Move fam15h_power_groups and fam15h_power_group into fam15h_power_data to
  avoid overwrite on multi-CPU system.
- Rename FAM15H_MIN_NUM_ATTRS macro and fix return error code.
- Remove unnecessary warning print.
- Adds do_read_registers_on_cu to do all the read to all MSRs and run it on one
  of the online cores on each compute unit with smp_call_function_many().
- Use power1_average and power1_average_interval standard entry
  instread of power1_acc
- Fix the CPU-hotplug case.

Changes from v2 -> v3:
- As Guenter's suggestion, remove typecast, use &data->groups[0].
- Remove all "fam15_power_*" prefix at data.
- Remove unnecessary ( ).
- Fix the issue that is reported by build test robot, and add
  CPU_SUP_AMD as the dependence of fam15h_power
- Remove the WARN_ON at do_read_registers_on_cu, because it must be
  behind CPUID check. The MSR must be available since
  CPUID.8000_0007H:EDX[12] is set 
- Add get_online_cpus()/put_online_cpus() functions.
- Refine commments and the method which generate cpumask for cu.
- Add the interval scope to make the value suitable for user
  experience
- Remove the useless mutex.

A simple example:

ray@hr-ub:~/tip$ sensors
fam15h_power-pci-00c4
Adapter: PCI adapter
power1:       23.73 mW (avg = 634.63 mW, interval =   0.01 s)
                       (crit =  15.00 W)

...

These patches are rebased on groeck/hwmon-next.

Thanks,
Rui

Huang Rui (10):
  hwmon: (fam15h_power) Refactor attributes for dynamically added
  hwmon: (fam15h_power) Enable power1_input on AMD Carrizo
  hwmon: (fam15h_power) Add max compute unit accumulated power
  x86, amd: add accessor for number of cores per compute unit
  hwmon: (fam15h_power) Add CPU_SUP_AMD as the dependence
  hwmon: (fam15h_power) Add compute unit accumulated power
  hwmon: (fam15h_power) Add ptsc counter value for accumulated power
  hwmon: (fam15h_power) Introduce a cpu accumulated power reporting
    algorithm
  hwmon: (fam15h_power) Add documentation for TDP and accumulated power
    algorithm
  MAINTAINERS: change the maintainer of fam15h_power driver

 CREDITS                          |   8 ++
 Documentation/hwmon/fam15h_power |  57 +++++++-
 MAINTAINERS                      |   4 +-
 arch/x86/include/asm/msr-index.h |   1 +
 arch/x86/include/asm/processor.h |   1 +
 arch/x86/kernel/cpu/amd.c        |  19 ++-
 drivers/hwmon/Kconfig            |   2 +-
 drivers/hwmon/fam15h_power.c     | 278 +++++++++++++++++++++++++++++++++++----
 8 files changed, 341 insertions(+), 29 deletions(-)

-- 
1.9.1