9522a2ff9c
Use ACPI _PPC notification to limit max P state driver will request. ACPI _PPC change notification is sent by BIOS to limit max P state in several cases: - Reduce impact of platform thermal condition - When Config TDP feature is used, a changed _PPC is sent to follow TDP change - Remote node managers in server want to control platform power via baseboard management controller (BMC) This change registers with ACPI processor performance lib so that _PPC changes are notified to cpufreq core, which in turns will result in call to .setpolicy() callback. Also the way _PSS table identifies a turbo frequency is not compatible to max turbo frequency in intel_pstate, so the very first entry in _PSS needs to be adjusted. This feature can be turned on by using kernel parameters: intel_pstate=support_acpi_ppc Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> [ rjw: Minor cleanups ] Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
299 lines
9.0 KiB
Plaintext
299 lines
9.0 KiB
Plaintext
#
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# x86 CPU Frequency scaling drivers
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#
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config X86_INTEL_PSTATE
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bool "Intel P state control"
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depends on X86
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select ACPI_PROCESSOR if ACPI
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help
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This driver provides a P state for Intel core processors.
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The driver implements an internal governor and will become
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the scaling driver and governor for Sandy bridge processors.
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When this driver is enabled it will become the preferred
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scaling driver for Sandy bridge processors.
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If in doubt, say N.
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config X86_PCC_CPUFREQ
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tristate "Processor Clocking Control interface driver"
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depends on ACPI && ACPI_PROCESSOR
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help
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This driver adds support for the PCC interface.
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For details, take a look at:
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<file:Documentation/cpu-freq/pcc-cpufreq.txt>.
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To compile this driver as a module, choose M here: the
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module will be called pcc-cpufreq.
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If in doubt, say N.
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config X86_ACPI_CPUFREQ
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tristate "ACPI Processor P-States driver"
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depends on ACPI_PROCESSOR
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help
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This driver adds a CPUFreq driver which utilizes the ACPI
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Processor Performance States.
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This driver also supports Intel Enhanced Speedstep and newer
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AMD CPUs.
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To compile this driver as a module, choose M here: the
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module will be called acpi-cpufreq.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_ACPI_CPUFREQ_CPB
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default y
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bool "Legacy cpb sysfs knob support for AMD CPUs"
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depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
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help
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The powernow-k8 driver used to provide a sysfs knob called "cpb"
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to disable the Core Performance Boosting feature of AMD CPUs. This
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file has now been superseded by the more generic "boost" entry.
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By enabling this option the acpi_cpufreq driver provides the old
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entry in addition to the new boost ones, for compatibility reasons.
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config X86_SFI_CPUFREQ
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tristate "SFI Performance-States driver"
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depends on X86_INTEL_MID && SFI
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help
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This adds a CPUFreq driver for some Silvermont based Intel Atom
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architectures like Z34xx and Z35xx which enumerate processor
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performance states through SFI.
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If in doubt, say N.
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config ELAN_CPUFREQ
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tristate "AMD Elan SC400 and SC410"
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depends on MELAN
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---help---
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This adds the CPUFreq driver for AMD Elan SC400 and SC410
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processors.
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You need to specify the processor maximum speed as boot
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parameter: elanfreq=maxspeed (in kHz) or as module
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parameter "max_freq".
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config SC520_CPUFREQ
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tristate "AMD Elan SC520"
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depends on MELAN
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---help---
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This adds the CPUFreq driver for AMD Elan SC520 processor.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_POWERNOW_K6
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tristate "AMD Mobile K6-2/K6-3 PowerNow!"
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depends on X86_32
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help
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This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
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AMD K6-3+ processors.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_POWERNOW_K7
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tristate "AMD Mobile Athlon/Duron PowerNow!"
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depends on X86_32
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help
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This adds the CPUFreq driver for mobile AMD K7 mobile processors.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_POWERNOW_K7_ACPI
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bool
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depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
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depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
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depends on X86_32
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default y
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config X86_POWERNOW_K8
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tristate "AMD Opteron/Athlon64 PowerNow!"
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depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
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help
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This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
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Support for K10 and newer processors is now in acpi-cpufreq.
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To compile this driver as a module, choose M here: the
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module will be called powernow-k8.
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For details, take a look at <file:Documentation/cpu-freq/>.
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config X86_AMD_FREQ_SENSITIVITY
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tristate "AMD frequency sensitivity feedback powersave bias"
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depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
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help
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This adds AMD-specific powersave bias function to the ondemand
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governor, which allows it to make more power-conscious frequency
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change decisions based on feedback from hardware (available on AMD
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Family 16h and above).
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Hardware feedback tells software how "sensitive" to frequency changes
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the CPUs' workloads are. CPU-bound workloads will be more sensitive
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-- they will perform better as frequency increases. Memory/IO-bound
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workloads will be less sensitive -- they will not necessarily perform
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better as frequency increases.
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If in doubt, say N.
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config X86_GX_SUSPMOD
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tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
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depends on X86_32 && PCI
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help
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This add the CPUFreq driver for NatSemi Geode processors which
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support suspend modulation.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_SPEEDSTEP_CENTRINO
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tristate "Intel Enhanced SpeedStep (deprecated)"
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select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
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depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
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help
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This is deprecated and this functionality is now merged into
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acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
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speedstep_centrino.
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This adds the CPUFreq driver for Enhanced SpeedStep enabled
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mobile CPUs. This means Intel Pentium M (Centrino) CPUs
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or 64bit enabled Intel Xeons.
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To compile this driver as a module, choose M here: the
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module will be called speedstep-centrino.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_SPEEDSTEP_CENTRINO_TABLE
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bool "Built-in tables for Banias CPUs"
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depends on X86_32 && X86_SPEEDSTEP_CENTRINO
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default y
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help
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Use built-in tables for Banias CPUs if ACPI encoding
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is not available.
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If in doubt, say N.
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config X86_SPEEDSTEP_ICH
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tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
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depends on X86_32
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help
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This adds the CPUFreq driver for certain mobile Intel Pentium III
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(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
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mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
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ICH3 or ICH4 southbridge.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_SPEEDSTEP_SMI
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tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
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depends on X86_32
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help
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This adds the CPUFreq driver for certain mobile Intel Pentium III
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(Coppermine), all mobile Intel Pentium III-M (Tualatin)
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on systems which have an Intel 440BX/ZX/MX southbridge.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_P4_CLOCKMOD
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tristate "Intel Pentium 4 clock modulation"
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help
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This adds the CPUFreq driver for Intel Pentium 4 / XEON
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processors. When enabled it will lower CPU temperature by skipping
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clocks.
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This driver should be only used in exceptional
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circumstances when very low power is needed because it causes severe
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slowdowns and noticeable latencies. Normally Speedstep should be used
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instead.
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To compile this driver as a module, choose M here: the
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module will be called p4-clockmod.
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For details, take a look at <file:Documentation/cpu-freq/>.
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Unless you are absolutely sure say N.
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config X86_CPUFREQ_NFORCE2
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tristate "nVidia nForce2 FSB changing"
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depends on X86_32
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help
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This adds the CPUFreq driver for FSB changing on nVidia nForce2
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platforms.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_LONGRUN
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tristate "Transmeta LongRun"
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depends on X86_32
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help
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This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
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which support LongRun.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_LONGHAUL
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tristate "VIA Cyrix III Longhaul"
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depends on X86_32 && ACPI_PROCESSOR
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help
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This adds the CPUFreq driver for VIA Samuel/CyrixIII,
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VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
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processors.
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For details, take a look at <file:Documentation/cpu-freq/>.
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If in doubt, say N.
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config X86_E_POWERSAVER
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tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
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depends on X86_32 && ACPI_PROCESSOR
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help
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This adds the CPUFreq driver for VIA C7 processors. However, this driver
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does not have any safeguards to prevent operating the CPU out of spec
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and is thus considered dangerous. Please use the regular ACPI cpufreq
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driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
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If in doubt, say N.
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comment "shared options"
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config X86_SPEEDSTEP_LIB
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tristate
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default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
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config X86_SPEEDSTEP_RELAXED_CAP_CHECK
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bool "Relaxed speedstep capability checks"
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depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
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help
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Don't perform all checks for a speedstep capable system which would
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normally be done. Some ancient or strange systems, though speedstep
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capable, don't always indicate that they are speedstep capable. This
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option lets the probing code bypass some of those checks if the
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parameter "relaxed_check=1" is passed to the module.
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