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_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
  53 config 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  60           file has now been superseded by the more generic "boost" entry.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
  65 config 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
  75 config 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
  90 config 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
 101 config 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
 112 config 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
 122 config 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
 129 config 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
 141 config 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
 158 config 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
 169 config 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
 188 config 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
 198 config 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
 211 config 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
 223 config 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
 242 config 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
 253 config 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
 264 config 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
 276 config 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
 287 comment "shared options"
 288
 289 config X86_SPEEDSTEP_LIB
 290         tristate
 291         default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
 292
 293 config 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