Date:	Fri, 11 Mar 2016 10:17:44 +0800
From:	Huang Rui <ray.huang@....com>
To:	Guenter Roeck <linux@...ck-us.net>, Jean Delvare <jdelvare@...e.de>
CC:	<lm-sensors@...sensors.org>, <linux-kernel@...r.kernel.org>,
	<spg_linux_kernel@....com>,
	Aravind Gopalakrishnan <Aravind.Gopalakrishnan@....com>,
	Borislav Petkov <bp@...en8.de>, Huang Rui <ray.huang@....com>
Subject: [PATCH v4 0/6] hwmon: (fam15h_power) Introduce an accumulated power reporting algorithm

Hi Guenter,

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:
https://lkml.kernel.org/r/1438744732-1459-1-git-send-email-ray.huang@amd.com

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: https://lkml.kernel.org/r/1440662866-28716-1-git-send-email-ray.huang@amd.com
V2: https://lkml.kernel.org/r/1445308109-17970-1-git-send-email-ray.huang@amd.com
V3: https://lkml.kernel.org/r/1446199024-1896-1-git-send-email-ray.huang@amd.com

V3 is blocked by the patch "x86, amd: add accessor for number of cores
per compute unit", but now we can use smp_num_siblings instead of
cores_per_cu accessor. So resend the V4 now, for detailed info, please
check:

https://lkml.kernel.org/r/1449719771-12837-1-git-send-email-ray.huang@amd.com


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.

Changes from v3 -> v4:
- Rebase the patches to latest groeck/hwmon-next.
- Use smp_num_siblings instead of cores_per_cu accessor.
- Refine the cpumask method which is inspired by perf solution.
- Fix some typo and errors.


A simple example:

ray@...ub:~/tip$ sensors
fam15h_power-pci-00c4
Adapter: PCI adapter
power1:       19.58 mW (avg =   2.55 mW, interval =   0.01 s)
                       (crit =  15.00 W)

...

These patches are rebased on groeck/hwmon-next.

Thanks,
Rui


Huang Rui (6):
  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
  hwmon: (fam15h_power) Add platform check function

 Documentation/hwmon/fam15h_power |  57 +++++++++++-
 drivers/hwmon/Kconfig            |   2 +-
 drivers/hwmon/fam15h_power.c     | 191 ++++++++++++++++++++++++++++++++++++++-
 3 files changed, 244 insertions(+), 6 deletions(-)

-- 
1.9.1

Powered by blists - more mailing lists