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docs: hwmon: fam15h_power: convert to ReST format

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Convert fam15h_power to ReST format, in order to allow it to
be parsed by Sphinx.

Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung@kernel.org>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
This commit is contained in:
Mauro Carvalho Chehab 2019-04-17 06:46:15 -03:00 committed by Guenter Roeck
parent a9fc881b9b
commit b413e3fa7f
1 changed files with 57 additions and 28 deletions
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Documentation/hwmon/fam15h_power
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@ -2,15 +2,20 @@ Kernel driver fam15h_power
==========================
Supported chips:
* AMD Family 15h Processors
* AMD Family 16h Processors
Prefix: 'fam15h_power'
Addresses scanned: PCI space
Datasheets:
BIOS and Kernel Developer's Guide (BKDG) For AMD Family 15h Processors
BIOS and Kernel Developer's Guide (BKDG) For AMD Family 16h Processors
AMD64 Architecture Programmer's Manual Volume 2: System Programming
- BIOS and Kernel Developer's Guide (BKDG) For AMD Family 15h Processors
- BIOS and Kernel Developer's Guide (BKDG) For AMD Family 16h Processors
- AMD64 Architecture Programmer's Manual Volume 2: System Programming
Author: Andreas Herrmann <herrmann.der.user@googlemail.com>
@ -31,14 +36,19 @@ For AMD Family 15h and 16h processors the following power values can
be calculated using different processor northbridge function
registers:
* BasePwrWatts: Specifies in watts the maximum amount of power
consumed by the processor for NB and logic external to the core.
* ProcessorPwrWatts: Specifies in watts the maximum amount of power
the processor can support.
* CurrPwrWatts: Specifies in watts the current amount of power being
consumed by the processor.
* BasePwrWatts:
Specifies in watts the maximum amount of power
consumed by the processor for NB and logic external to the core.
* ProcessorPwrWatts:
Specifies in watts the maximum amount of power
the processor can support.
* CurrPwrWatts:
Specifies in watts the current amount of power being
consumed by the processor.
This driver provides ProcessorPwrWatts and CurrPwrWatts:
* power1_crit (ProcessorPwrWatts)
* power1_input (CurrPwrWatts)
@ -53,35 +63,53 @@ calculate the average power consumed by a processor during a
measurement interval Tm. The feature of accumulated power mechanism is
indicated by CPUID Fn8000_0007_EDX[12].
* Tsample: compute unit power accumulator sample period
* Tref: the PTSC counter period
* PTSC: performance timestamp counter
* N: the ratio of compute unit power accumulator sample period to the
PTSC period
* Jmax: max compute unit accumulated power which is indicated by
MaxCpuSwPwrAcc MSR C001007b
* Jx/Jy: compute unit accumulated power which is indicated by
CpuSwPwrAcc MSR C001007a
* Tx/Ty: the value of performance timestamp counter which is indicated
by CU_PTSC MSR C0010280
* PwrCPUave: CPU average power
* Tsample:
compute unit power accumulator sample period
* Tref:
the PTSC counter period
* PTSC:
performance timestamp counter
* N:
the ratio of compute unit power accumulator sample period to the
PTSC period
* Jmax:
max compute unit accumulated power which is indicated by
MaxCpuSwPwrAcc MSR C001007b
* Jx/Jy:
compute unit accumulated power which is indicated by
CpuSwPwrAcc MSR C001007a
* Tx/Ty:
the value of performance timestamp counter which is indicated
by CU_PTSC MSR C0010280
* PwrCPUave:
CPU average power
i. Determine the ratio of Tsample to Tref by executing CPUID Fn8000_0007.
N = value of CPUID Fn8000_0007_ECX[CpuPwrSampleTimeRatio[15:0]].
ii. Read the full range of the cumulative energy value from the new
MSR MaxCpuSwPwrAcc.
MSR MaxCpuSwPwrAcc.
Jmax = value returned.
iii. At time x, SW reads CpuSwPwrAcc MSR and samples the PTSC.
Jx = value read from CpuSwPwrAcc and Tx = value read from
PTSC.
Jx = value read from CpuSwPwrAcc and Tx = value read from PTSC.
iv. At time y, SW reads CpuSwPwrAcc MSR and samples the PTSC.
Jy = value read from CpuSwPwrAcc and Ty = value read from
PTSC.
Jy = value read from CpuSwPwrAcc and Ty = value read from PTSC.
v. Calculate the average power consumption for a compute unit over
time period (y-x). Unit of result is uWatt.
time period (y-x). Unit of result is uWatt::
if (Jy < Jx) // Rollover has occurred
Jdelta = (Jy + Jmax) - Jx
else
@ -90,13 +118,14 @@ time period (y-x). Unit of result is uWatt.
This driver provides PwrCPUave and interval(default is 10 millisecond
and maximum is 1 second):
* power1_average (PwrCPUave)
* power1_average_interval (Interval)
The power1_average_interval can be updated at /etc/sensors3.conf file
as below:
chip "fam15h_power-*"
chip `fam15h_power-*`
set power1_average_interval 0.01
Then save it with "sensors -s".