drivers/cpufreq/Kconfig.x86

   1 # SPDX-License-Identifier: GPL-2.0-only
   2 #
   3 # x86 CPU Frequency scaling drivers
   4 #
   5
   6 config 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
  23 config 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
  37 config X86_AMD_PSTATE
  38         bool "AMD Processor P-State driver"
  39         depends on X86 && ACPI
  40         select ACPI_PROCESSOR
  41         select ACPI_CPPC_LIB if X86_64
  42         select CPU_FREQ_GOV_SCHEDUTIL if SMP
  43         help
  44           This driver adds a CPUFreq driver which utilizes a fine grain
  45           processor performance frequency control range instead of legacy
  46           performance levels. _CPC needs to be present in the ACPI tables
  47           of the system.
  48
  49           For details, take a look at:
  50           <file:Documentation/admin-guide/pm/amd-pstate.rst>.
  51
  52           If in doubt, say N.
  53
  54 config X86_AMD_PSTATE_DEFAULT_MODE
  55         int "AMD Processor P-State default mode"
  56         depends on X86_AMD_PSTATE
  57         default 3 if X86_AMD_PSTATE
  58         range 1 4
  59         help
  60           Select the default mode the amd-pstate driver will use on
  61           supported hardware.
  62           The value set has the following meanings:
  63                 1 -> Disabled
  64                 2 -> Passive
  65                 3 -> Active (EPP)
  66                 4 -> Guided
  67
  68           For details, take a look at:
  69           <file:Documentation/admin-guide/pm/amd-pstate.rst>.
  70
  71 config X86_AMD_PSTATE_UT
  72         tristate "selftest for AMD Processor P-State driver"
  73         depends on X86 && ACPI_PROCESSOR
  74         depends on X86_AMD_PSTATE
  75         default n
  76         help
  77           This kernel module is used for testing. It's safe to say M here.
  78
  79           It can also be built-in without X86_AMD_PSTATE enabled.
  80           Currently, only tests for amd-pstate are supported. If X86_AMD_PSTATE
  81           is set disabled, it can tell the users test can only run on amd-pstate
  82           driver, please set X86_AMD_PSTATE enabled.
  83           In the future, comparison tests will be added. It can set amd-pstate
  84           disabled and set acpi-cpufreq enabled to run test cases, then compare
  85           the test results.
  86
  87 config X86_ACPI_CPUFREQ
  88         tristate "ACPI Processor P-States driver"
  89         depends on ACPI_PROCESSOR
  90         help
  91           This driver adds a CPUFreq driver which utilizes the ACPI
  92           Processor Performance States.
  93           This driver also supports Intel Enhanced Speedstep and newer
  94           AMD CPUs.
  95
  96           To compile this driver as a module, choose M here: the
  97           module will be called acpi-cpufreq.
  98
  99           For details, take a look at <file:Documentation/cpu-freq/>.
 100
 101           If in doubt, say N.
 102
 103 config X86_ACPI_CPUFREQ_CPB
 104         default y
 105         bool "Legacy cpb sysfs knob support for AMD CPUs"
 106         depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
 107         help
 108           The powernow-k8 driver used to provide a sysfs knob called "cpb"
 109           to disable the Core Performance Boosting feature of AMD CPUs. This
 110           file has now been superseded by the more generic "boost" entry.
 111
 112           By enabling this option the acpi_cpufreq driver provides the old
 113           entry in addition to the new boost ones, for compatibility reasons.
 114
 115 config ELAN_CPUFREQ
 116         tristate "AMD Elan SC400 and SC410"
 117         depends on MELAN
 118         help
 119           This adds the CPUFreq driver for AMD Elan SC400 and SC410
 120           processors.
 121
 122           You need to specify the processor maximum speed as boot
 123           parameter: elanfreq=maxspeed (in kHz) or as module
 124           parameter "max_freq".
 125
 126           For details, take a look at <file:Documentation/cpu-freq/>.
 127
 128           If in doubt, say N.
 129
 130 config SC520_CPUFREQ
 131         tristate "AMD Elan SC520"
 132         depends on MELAN
 133         help
 134           This adds the CPUFreq driver for AMD Elan SC520 processor.
 135
 136           For details, take a look at <file:Documentation/cpu-freq/>.
 137
 138           If in doubt, say N.
 139
 140
 141 config X86_POWERNOW_K6
 142         tristate "AMD Mobile K6-2/K6-3 PowerNow!"
 143         depends on X86_32
 144         help
 145           This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
 146           AMD K6-3+ processors.
 147
 148           For details, take a look at <file:Documentation/cpu-freq/>.
 149
 150           If in doubt, say N.
 151
 152 config X86_POWERNOW_K7
 153         tristate "AMD Mobile Athlon/Duron PowerNow!"
 154         depends on X86_32
 155         help
 156           This adds the CPUFreq driver for mobile AMD K7 mobile processors.
 157
 158           For details, take a look at <file:Documentation/cpu-freq/>.
 159
 160           If in doubt, say N.
 161
 162 config X86_POWERNOW_K7_ACPI
 163         bool
 164         depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
 165         depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
 166         depends on X86_32
 167         default y
 168
 169 config X86_POWERNOW_K8
 170         tristate "AMD Opteron/Athlon64 PowerNow!"
 171         depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
 172         help
 173           This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
 174           Support for K10 and newer processors is now in acpi-cpufreq.
 175
 176           To compile this driver as a module, choose M here: the
 177           module will be called powernow-k8.
 178
 179           For details, take a look at <file:Documentation/cpu-freq/>.
 180
 181 config X86_AMD_FREQ_SENSITIVITY
 182         tristate "AMD frequency sensitivity feedback powersave bias"
 183         depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
 184         help
 185           This adds AMD-specific powersave bias function to the ondemand
 186           governor, which allows it to make more power-conscious frequency
 187           change decisions based on feedback from hardware (available on AMD
 188           Family 16h and above).
 189
 190           Hardware feedback tells software how "sensitive" to frequency changes
 191           the CPUs' workloads are. CPU-bound workloads will be more sensitive
 192           -- they will perform better as frequency increases. Memory/IO-bound
 193           workloads will be less sensitive -- they will not necessarily perform
 194           better as frequency increases.
 195
 196           If in doubt, say N.
 197
 198 config X86_GX_SUSPMOD
 199         tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
 200         depends on X86_32 && PCI
 201         help
 202          This add the CPUFreq driver for NatSemi Geode processors which
 203          support suspend modulation.
 204
 205          For details, take a look at <file:Documentation/cpu-freq/>.
 206
 207          If in doubt, say N.
 208
 209 config X86_SPEEDSTEP_CENTRINO
 210         tristate "Intel Enhanced SpeedStep (deprecated)"
 211         select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
 212         depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
 213         help
 214           This is deprecated and this functionality is now merged into
 215           acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
 216           speedstep_centrino.
 217           This adds the CPUFreq driver for Enhanced SpeedStep enabled
 218           mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
 219           or 64bit enabled Intel Xeons.
 220
 221           To compile this driver as a module, choose M here: the
 222           module will be called speedstep-centrino.
 223
 224           For details, take a look at <file:Documentation/cpu-freq/>.
 225
 226           If in doubt, say N.
 227
 228 config X86_SPEEDSTEP_CENTRINO_TABLE
 229         bool "Built-in tables for Banias CPUs"
 230         depends on X86_32 && X86_SPEEDSTEP_CENTRINO
 231         default y
 232         help
 233           Use built-in tables for Banias CPUs if ACPI encoding
 234           is not available.
 235
 236           If in doubt, say N.
 237
 238 config X86_SPEEDSTEP_ICH
 239         tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
 240         depends on X86_32
 241         help
 242           This adds the CPUFreq driver for certain mobile Intel Pentium III
 243           (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
 244           mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
 245           ICH3 or ICH4 southbridge.
 246
 247           For details, take a look at <file:Documentation/cpu-freq/>.
 248
 249           If in doubt, say N.
 250
 251 config X86_SPEEDSTEP_SMI
 252         tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
 253         depends on X86_32
 254         help
 255           This adds the CPUFreq driver for certain mobile Intel Pentium III
 256           (Coppermine), all mobile Intel Pentium III-M (Tualatin)
 257           on systems which have an Intel 440BX/ZX/MX southbridge.
 258
 259           For details, take a look at <file:Documentation/cpu-freq/>.
 260
 261           If in doubt, say N.
 262
 263 config X86_P4_CLOCKMOD
 264         tristate "Intel Pentium 4 clock modulation"
 265         help
 266           This adds the CPUFreq driver for Intel Pentium 4 / XEON
 267           processors.  When enabled it will lower CPU temperature by skipping
 268           clocks.
 269
 270           This driver should be only used in exceptional
 271           circumstances when very low power is needed because it causes severe
 272           slowdowns and noticeable latencies.  Normally Speedstep should be used
 273           instead.
 274
 275           To compile this driver as a module, choose M here: the
 276           module will be called p4-clockmod.
 277
 278           For details, take a look at <file:Documentation/cpu-freq/>.
 279
 280           Unless you are absolutely sure say N.
 281
 282 config X86_CPUFREQ_NFORCE2
 283         tristate "nVidia nForce2 FSB changing"
 284         depends on X86_32
 285         help
 286           This adds the CPUFreq driver for FSB changing on nVidia nForce2
 287           platforms.
 288
 289           For details, take a look at <file:Documentation/cpu-freq/>.
 290
 291           If in doubt, say N.
 292
 293 config X86_LONGRUN
 294         tristate "Transmeta LongRun"
 295         depends on X86_32
 296         help
 297           This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
 298           which support LongRun.
 299
 300           For details, take a look at <file:Documentation/cpu-freq/>.
 301
 302           If in doubt, say N.
 303
 304 config X86_LONGHAUL
 305         tristate "VIA Cyrix III Longhaul"
 306         depends on X86_32 && ACPI_PROCESSOR
 307         help
 308           This adds the CPUFreq driver for VIA Samuel/CyrixIII,
 309           VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
 310           processors.
 311
 312           For details, take a look at <file:Documentation/cpu-freq/>.
 313
 314           If in doubt, say N.
 315
 316 config X86_E_POWERSAVER
 317         tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
 318         depends on X86_32 && ACPI_PROCESSOR
 319         help
 320           This adds the CPUFreq driver for VIA C7 processors.  However, this driver
 321           does not have any safeguards to prevent operating the CPU out of spec
 322           and is thus considered dangerous.  Please use the regular ACPI cpufreq
 323           driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
 324
 325           If in doubt, say N.
 326
 327 comment "shared options"
 328
 329 config X86_SPEEDSTEP_LIB
 330         tristate
 331         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 332
 333 config X86_SPEEDSTEP_RELAXED_CAP_CHECK
 334         bool "Relaxed speedstep capability checks"
 335         depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
 336         help
 337           Don't perform all checks for a speedstep capable system which would
 338           normally be done. Some ancient or strange systems, though speedstep
 339           capable, don't always indicate that they are speedstep capable. This
 340           option lets the probing code bypass some of those checks if the
 341           parameter "relaxed_check=1" is passed to the module.
 342