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| -rw-r--r-- | Documentation/hwmon/fam15h_power | 85 |
1 files changed, 57 insertions, 28 deletions
diff --git a/Documentation/hwmon/fam15h_power b/Documentation/hwmon/fam15h_power index fb594c281c46..fdde632c93a3 100644 --- a/Documentation/hwmon/fam15h_power +++ b/Documentation/hwmon/fam15h_power @@ -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". |