LXR linux/drivers/cpufreq/Kconfig.x86

   1# SPDX-License-Identifier: GPL-2.0-only
   2#
   3# x86 CPU Frequency scaling drivers
   4#
   5
   6config X86_INTEL_PSTATE
   7        bool "Intel P state control"
   8        depends on X86
   9        select ACPI_PROCESSOR if ACPI
  10        select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
  11        select CPU_FREQ_GOV_PERFORMANCE
  12        select CPU_FREQ_GOV_SCHEDUTIL if SMP
  13        help
  14          This driver provides a P state for Intel core processors.
  15          The driver implements an internal governor and will become
  16          the scaling driver and governor for Sandy bridge processors.
  17
  18          When this driver is enabled it will become the preferred
  19          scaling driver for Sandy bridge processors.
  20
  21          If in doubt, say N.
  22
  23config X86_PCC_CPUFREQ
  24        tristate "Processor Clocking Control interface driver"
  25        depends on ACPI && ACPI_PROCESSOR
  26        help
  27          This driver adds support for the PCC interface.
  28
  29          For details, take a look at:
  30          <file:Documentation/admin-guide/pm/cpufreq_drivers.rst>.
  31
  32          To compile this driver as a module, choose M here: the
  33          module will be called pcc-cpufreq.
  34
  35          If in doubt, say N.
  36
  37config X86_ACPI_CPUFREQ
  38        tristate "ACPI Processor P-States driver"
  39        depends on ACPI_PROCESSOR
  40        help
  41          This driver adds a CPUFreq driver which utilizes the ACPI
  42          Processor Performance States.
  43          This driver also supports Intel Enhanced Speedstep and newer
  44          AMD CPUs.
  45
  46          To compile this driver as a module, choose M here: the
  47          module will be called acpi-cpufreq.
  48
  49          For details, take a look at <file:Documentation/cpu-freq/>.
  50
  51          If in doubt, say N.
  52
  53config X86_ACPI_CPUFREQ_CPB
  54        default y
  55        bool "Legacy cpb sysfs knob support for AMD CPUs"
  56        depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
  57        help
  58          The powernow-k8 driver used to provide a sysfs knob called "cpb"
  59          to disable the Core Performance Boosting feature of AMD CPUs. This
  60          file has now been superseded by the more generic "boost" entry.
  61
  62          By enabling this option the acpi_cpufreq driver provides the old
  63          entry in addition to the new boost ones, for compatibility reasons.
  64
  65config X86_SFI_CPUFREQ
  66        tristate "SFI Performance-States driver"
  67        depends on X86_INTEL_MID && SFI
  68        help
  69          This adds a CPUFreq driver for some Silvermont based Intel Atom
  70          architectures like Z34xx and Z35xx which enumerate processor
  71          performance states through SFI.
  72
  73          If in doubt, say N.
  74
  75config ELAN_CPUFREQ
  76        tristate "AMD Elan SC400 and SC410"
  77        depends on MELAN
  78        help
  79          This adds the CPUFreq driver for AMD Elan SC400 and SC410
  80          processors.
  81
  82          You need to specify the processor maximum speed as boot
  83          parameter: elanfreq=maxspeed (in kHz) or as module
  84          parameter "max_freq".
  85
  86          For details, take a look at <file:Documentation/cpu-freq/>.
  87
  88          If in doubt, say N.
  89
  90config SC520_CPUFREQ
  91        tristate "AMD Elan SC520"
  92        depends on MELAN
  93        help
  94          This adds the CPUFreq driver for AMD Elan SC520 processor.
  95
  96          For details, take a look at <file:Documentation/cpu-freq/>.
  97
  98          If in doubt, say N.
  99
 100
 101config X86_POWERNOW_K6
 102        tristate "AMD Mobile K6-2/K6-3 PowerNow!"
 103        depends on X86_32
 104        help
 105          This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
 106          AMD K6-3+ processors.
 107
 108          For details, take a look at <file:Documentation/cpu-freq/>.
 109
 110          If in doubt, say N.
 111
 112config X86_POWERNOW_K7
 113        tristate "AMD Mobile Athlon/Duron PowerNow!"
 114        depends on X86_32
 115        help
 116          This adds the CPUFreq driver for mobile AMD K7 mobile processors.
 117
 118          For details, take a look at <file:Documentation/cpu-freq/>.
 119
 120          If in doubt, say N.
 121
 122config X86_POWERNOW_K7_ACPI
 123        bool
 124        depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
 125        depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
 126        depends on X86_32
 127        default y
 128
 129config X86_POWERNOW_K8
 130        tristate "AMD Opteron/Athlon64 PowerNow!"
 131        depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
 132        help
 133          This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
 134          Support for K10 and newer processors is now in acpi-cpufreq.
 135
 136          To compile this driver as a module, choose M here: the
 137          module will be called powernow-k8.
 138
 139          For details, take a look at <file:Documentation/cpu-freq/>.
 140
 141config X86_AMD_FREQ_SENSITIVITY
 142        tristate "AMD frequency sensitivity feedback powersave bias"
 143        depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
 144        help
 145          This adds AMD-specific powersave bias function to the ondemand
 146          governor, which allows it to make more power-conscious frequency
 147          change decisions based on feedback from hardware (available on AMD
 148          Family 16h and above).
 149
 150          Hardware feedback tells software how "sensitive" to frequency changes
 151          the CPUs' workloads are. CPU-bound workloads will be more sensitive
 152          -- they will perform better as frequency increases. Memory/IO-bound
 153          workloads will be less sensitive -- they will not necessarily perform
 154          better as frequency increases.
 155
 156          If in doubt, say N.
 157
 158config X86_GX_SUSPMOD
 159        tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 160        depends on X86_32 && PCI
 161        help
 162         This add the CPUFreq driver for NatSemi Geode processors which
 163         support suspend modulation.
 164
 165         For details, take a look at <file:Documentation/cpu-freq/>.
 166
 167         If in doubt, say N.
 168
 169config X86_SPEEDSTEP_CENTRINO
 170        tristate "Intel Enhanced SpeedStep (deprecated)"
 171        select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 172        depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 173        help
 174          This is deprecated and this functionality is now merged into
 175          acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 176          speedstep_centrino.
 177          This adds the CPUFreq driver for Enhanced SpeedStep enabled
 178          mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 179          or 64bit enabled Intel Xeons.
 180
 181          To compile this driver as a module, choose M here: the
 182          module will be called speedstep-centrino.
 183
 184          For details, take a look at <file:Documentation/cpu-freq/>.
 185
 186          If in doubt, say N.
 187
 188config X86_SPEEDSTEP_CENTRINO_TABLE
 189        bool "Built-in tables for Banias CPUs"
 190        depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 191        default y
 192        help
 193          Use built-in tables for Banias CPUs if ACPI encoding
 194          is not available.
 195
 196          If in doubt, say N.
 197
 198config X86_SPEEDSTEP_ICH
 199        tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 200        depends on X86_32
 201        help
 202          This adds the CPUFreq driver for certain mobile Intel Pentium III
 203          (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 204          mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 205          ICH3 or ICH4 southbridge.
 206
 207          For details, take a look at <file:Documentation/cpu-freq/>.
 208
 209          If in doubt, say N.
 210
 211config X86_SPEEDSTEP_SMI
 212        tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 213        depends on X86_32
 214        help
 215          This adds the CPUFreq driver for certain mobile Intel Pentium III
 216          (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 217          on systems which have an Intel 440BX/ZX/MX southbridge.
 218
 219          For details, take a look at <file:Documentation/cpu-freq/>.
 220
 221          If in doubt, say N.
 222
 223config X86_P4_CLOCKMOD
 224        tristate "Intel Pentium 4 clock modulation"
 225        help
 226          This adds the CPUFreq driver for Intel Pentium 4 / XEON
 227          processors.  When enabled it will lower CPU temperature by skipping
 228          clocks.
 229
 230          This driver should be only used in exceptional
 231          circumstances when very low power is needed because it causes severe
 232          slowdowns and noticeable latencies.  Normally Speedstep should be used
 233          instead.
 234
 235          To compile this driver as a module, choose M here: the
 236          module will be called p4-clockmod.
 237
 238          For details, take a look at <file:Documentation/cpu-freq/>.
 239
 240          Unless you are absolutely sure say N.
 241
 242config X86_CPUFREQ_NFORCE2
 243        tristate "nVidia nForce2 FSB changing"
 244        depends on X86_32
 245        help
 246          This adds the CPUFreq driver for FSB changing on nVidia nForce2
 247          platforms.
 248
 249          For details, take a look at <file:Documentation/cpu-freq/>.
 250
 251          If in doubt, say N.
 252
 253config X86_LONGRUN
 254        tristate "Transmeta LongRun"
 255        depends on X86_32
 256        help
 257          This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 258          which support LongRun.
 259
 260          For details, take a look at <file:Documentation/cpu-freq/>.
 261
 262          If in doubt, say N.
 263
 264config X86_LONGHAUL
 265        tristate "VIA Cyrix III Longhaul"
 266        depends on X86_32 && ACPI_PROCESSOR
 267        help
 268          This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 269          VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 270          processors.
 271
 272          For details, take a look at <file:Documentation/cpu-freq/>.
 273
 274          If in doubt, say N.
 275
 276config X86_E_POWERSAVER
 277        tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 278        depends on X86_32 && ACPI_PROCESSOR
 279        help
 280          This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 281          does not have any safeguards to prevent operating the CPU out of spec
 282          and is thus considered dangerous.  Please use the regular ACPI cpufreq
 283          driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 284
 285          If in doubt, say N.
 286
 287comment "shared options"
 288
 289config X86_SPEEDSTEP_LIB
 290        tristate
 291        default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 292
 293config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 294        bool "Relaxed speedstep capability checks"
 295        depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 296        help
 297          Don't perform all checks for a speedstep capable system which would
 298          normally be done. Some ancient or strange systems, though speedstep
 299          capable, don't always indicate that they are speedstep capable. This
 300          option lets the probing code bypass some of those checks if the
 301          parameter "relaxed_check=1" is passed to the module.
 302
 303