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0f1d683fb3
Processor Clocking Control (PCC) is an interface between the BIOS and OSPM. Based on the server workload, OSPM can request what frequency it expects from a logical CPU, and the BIOS will achieve that frequency transparently. This patch introduces driver support for PCC. OSPM uses the PCC driver to communicate with the BIOS via the PCC interface. There is a Documentation file that provides a link to the PCC Specification, and also provides a summary of the PCC interface. Currently, certain HP ProLiant platforms implement the PCC interface. However, any platform whose BIOS implements the PCC Specification, can utilize this driver. V2 --> V1 changes (based on Dominik's suggestions): - Removed the dependency on CPU_FREQ_TABLE - "cpufreq_stats" will no longer PANIC. Actually, it will not load anymore because it is not applicable. - Removed the sanity check for target frequency in the ->target routine. NOTE: A patch to sanitize the target frequency requested by "ondemand" is needed to ensure that the target freq < policy->min. Can this driver be queued up for the 2.6.33 tree? Signed-off-by: Naga Chumbalkar <nagananda.chumbalkar@hp.com> Signed-off-by: Matthew Garrett <mjg@redhat.com> Signed-off-by: Thomas Renninger <trenn@suse.de> Signed-off-by: Dave Jones <davej@redhat.com>
267 lines
7.3 KiB
Plaintext
267 lines
7.3 KiB
Plaintext
#
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# CPU Frequency scaling
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#
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menu "CPU Frequency scaling"
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source "drivers/cpufreq/Kconfig"
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if CPU_FREQ
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comment "CPUFreq processor drivers"
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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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select CPU_FREQ_TABLE
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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.
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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 ELAN_CPUFREQ
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tristate "AMD Elan SC400 and SC410"
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select CPU_FREQ_TABLE
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depends on X86_ELAN
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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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select CPU_FREQ_TABLE
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depends on X86_ELAN
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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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select CPU_FREQ_TABLE
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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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select CPU_FREQ_TABLE
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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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select CPU_FREQ_TABLE
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depends on ACPI && ACPI_PROCESSOR
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help
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This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
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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_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 CPU_FREQ_TABLE
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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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select CPU_FREQ_TABLE
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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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select CPU_FREQ_TABLE
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depends on X86_32 && EXPERIMENTAL
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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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select CPU_FREQ_TABLE
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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 && EXPERIMENTAL
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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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select CPU_FREQ_TABLE
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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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select CPU_FREQ_TABLE
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depends on X86_32 && EXPERIMENTAL
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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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endif # CPU_FREQ
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endmenu
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