projects / linux-block.git / blame
| Commit | Line | Data |
|---|---|---|
| ec8f24b7 | 1 | # SPDX-License-Identifier: GPL-2.0-only |
| 1da177e4 | 2 | # |
| bb0a56ec | 3 | # x86 CPU Frequency scaling drivers |
| 1da177e4 LT |
4 | # |
| 5 | ||
| 93f0822d | 6 | config X86_INTEL_PSTATE |
| cde10f85 KK |
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 | help | |
| 12 | This driver provides a P state for Intel core processors. | |
| 93f0822d | 13 | The driver implements an internal governor and will become |
| cde10f85 | 14 | the scaling driver and governor for Sandy bridge processors. |
| 93f0822d | 15 | |
| 735dc249 | 16 | When this driver is enabled it will become the preferred |
| cde10f85 | 17 | scaling driver for Sandy bridge processors. |
| 93f0822d | 18 | |
| 93f0822d DB |
19 | If in doubt, say N. |
| 20 | ||
| 0f1d683f NC |
21 | config X86_PCC_CPUFREQ |
| 22 | tristate "Processor Clocking Control interface driver" | |
| 23 | depends on ACPI && ACPI_PROCESSOR | |
| 24 | help | |
| 25 | This driver adds support for the PCC interface. | |
| 26 | ||
| 27 | For details, take a look at: | |
| c3419b71 | 28 | <file:Documentation/admin-guide/pm/cpufreq_drivers.rst>. |
| 0f1d683f NC |
29 | |
| 30 | To compile this driver as a module, choose M here: the | |
| 31 | module will be called pcc-cpufreq. | |
| 32 | ||
| 33 | If in doubt, say N. | |
| 34 | ||
| 1da177e4 LT |
35 | config X86_ACPI_CPUFREQ |
| 36 | tristate "ACPI Processor P-States driver" | |
| 1da177e4 LT |
37 | depends on ACPI_PROCESSOR |
| 38 | help | |
| 39 | This driver adds a CPUFreq driver which utilizes the ACPI | |
| 40 | Processor Performance States. | |
| 3dc9a633 MG |
41 | This driver also supports Intel Enhanced Speedstep and newer |
| 42 | AMD CPUs. | |
| 1da177e4 | 43 | |
| e8ef9522 SR |
44 | To compile this driver as a module, choose M here: the |
| 45 | module will be called acpi-cpufreq. | |
| 46 | ||
| 1da177e4 LT |
47 | For details, take a look at <file:Documentation/cpu-freq/>. |
| 48 | ||
| 49 | If in doubt, say N. | |
| 50 | ||
| 11269ff5 AP |
51 | config X86_ACPI_CPUFREQ_CPB |
| 52 | default y | |
| 53 | bool "Legacy cpb sysfs knob support for AMD CPUs" | |
| 54 | depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
| 55 | help | |
| 56 | The powernow-k8 driver used to provide a sysfs knob called "cpb" | |
| 57 | to disable the Core Performance Boosting feature of AMD CPUs. This | |
| 735dc249 | 58 | file has now been superseded by the more generic "boost" entry. |
| 11269ff5 AP |
59 | |
| 60 | By enabling this option the acpi_cpufreq driver provides the old | |
| 61 | entry in addition to the new boost ones, for compatibility reasons. | |
| 62 | ||
| e7ddf4b7 SK |
63 | config X86_SFI_CPUFREQ |
| 64 | tristate "SFI Performance-States driver" | |
| 65 | depends on X86_INTEL_MID && SFI | |
| 66 | help | |
| 67 | This adds a CPUFreq driver for some Silvermont based Intel Atom | |
| 68 | architectures like Z34xx and Z35xx which enumerate processor | |
| 69 | performance states through SFI. | |
| 70 | ||
| 71 | If in doubt, say N. | |
| 72 | ||
| 1da177e4 | 73 | config ELAN_CPUFREQ |
| bf6fc9fd | 74 | tristate "AMD Elan SC400 and SC410" |
| ce9c99af | 75 | depends on MELAN |
| 1da177e4 LT |
76 | ---help--- |
| 77 | This adds the CPUFreq driver for AMD Elan SC400 and SC410 | |
| 78 | processors. | |
| 79 | ||
| 80 | You need to specify the processor maximum speed as boot | |
| 81 | parameter: elanfreq=maxspeed (in kHz) or as module | |
| 82 | parameter "max_freq". | |
| 83 | ||
| 84 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 85 | ||
| 86 | If in doubt, say N. | |
| 87 | ||
| bf6fc9fd DJ |
88 | config SC520_CPUFREQ |
| 89 | tristate "AMD Elan SC520" | |
| ce9c99af | 90 | depends on MELAN |
| bf6fc9fd DJ |
91 | ---help--- |
| 92 | This adds the CPUFreq driver for AMD Elan SC520 processor. | |
| 93 | ||
| 94 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 95 | ||
| 96 | If in doubt, say N. | |
| 97 | ||
| 98 | ||
| 1da177e4 LT |
99 | config X86_POWERNOW_K6 |
| 100 | tristate "AMD Mobile K6-2/K6-3 PowerNow!" | |
| e8ef9522 | 101 | depends on X86_32 |
| 1da177e4 LT |
102 | help |
| 103 | This adds the CPUFreq driver for mobile AMD K6-2+ and mobile | |
| 104 | AMD K6-3+ processors. | |
| 105 | ||
| 106 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 107 | ||
| 108 | If in doubt, say N. | |
| 109 | ||
| 110 | config X86_POWERNOW_K7 | |
| 111 | tristate "AMD Mobile Athlon/Duron PowerNow!" | |
| e8ef9522 | 112 | depends on X86_32 |
| 1da177e4 LT |
113 | help |
| 114 | This adds the CPUFreq driver for mobile AMD K7 mobile processors. | |
| 115 | ||
| 116 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 117 | ||
| 118 | If in doubt, say N. | |
| 119 | ||
| 120 | config X86_POWERNOW_K7_ACPI | |
| 121 | bool | |
| 122 | depends on X86_POWERNOW_K7 && ACPI_PROCESSOR | |
| 123 | depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m) | |
| e8ef9522 | 124 | depends on X86_32 |
| 1da177e4 LT |
125 | default y |
| 126 | ||
| 127 | config X86_POWERNOW_K8 | |
| 128 | tristate "AMD Opteron/Athlon64 PowerNow!" | |
| 631e8ac1 | 129 | depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ |
| 1da177e4 | 130 | help |
| 034be8fd AP |
131 | This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors. |
| 132 | Support for K10 and newer processors is now in acpi-cpufreq. | |
| 1da177e4 | 133 | |
| e8ef9522 SR |
134 | To compile this driver as a module, choose M here: the |
| 135 | module will be called powernow-k8. | |
| 136 | ||
| 1da177e4 LT |
137 | For details, take a look at <file:Documentation/cpu-freq/>. |
| 138 | ||
| 9c5320c8 JS |
139 | config X86_AMD_FREQ_SENSITIVITY |
| 140 | tristate "AMD frequency sensitivity feedback powersave bias" | |
| 141 | depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD | |
| 142 | help | |
| 143 | This adds AMD-specific powersave bias function to the ondemand | |
| 144 | governor, which allows it to make more power-conscious frequency | |
| 8c88126b | 145 | change decisions based on feedback from hardware (available on AMD |
| 9c5320c8 JS |
146 | Family 16h and above). |
| 147 | ||
| 148 | Hardware feedback tells software how "sensitive" to frequency changes | |
| 149 | the CPUs' workloads are. CPU-bound workloads will be more sensitive | |
| 150 | -- they will perform better as frequency increases. Memory/IO-bound | |
| 151 | workloads will be less sensitive -- they will not necessarily perform | |
| 152 | better as frequency increases. | |
| 153 | ||
| 154 | If in doubt, say N. | |
| 155 | ||
| 1da177e4 LT |
156 | config X86_GX_SUSPMOD |
| 157 | tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation" | |
| e8ef9522 | 158 | depends on X86_32 && PCI |
| 1da177e4 LT |
159 | help |
| 160 | This add the CPUFreq driver for NatSemi Geode processors which | |
| 161 | support suspend modulation. | |
| 162 | ||
| 163 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 164 | ||
| 165 | If in doubt, say N. | |
| 166 | ||
| 167 | config X86_SPEEDSTEP_CENTRINO | |
| e8ef9522 | 168 | tristate "Intel Enhanced SpeedStep (deprecated)" |
| e8ef9522 SR |
169 | select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32 |
| 170 | depends on X86_32 || (X86_64 && ACPI_PROCESSOR) | |
| 1da177e4 | 171 | help |
| e8ef9522 SR |
172 | This is deprecated and this functionality is now merged into |
| 173 | acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of | |
| 174 | speedstep_centrino. | |
| 1da177e4 | 175 | This adds the CPUFreq driver for Enhanced SpeedStep enabled |
| e8ef9522 SR |
176 | mobile CPUs. This means Intel Pentium M (Centrino) CPUs |
| 177 | or 64bit enabled Intel Xeons. | |
| 178 | ||
| 179 | To compile this driver as a module, choose M here: the | |
| 180 | module will be called speedstep-centrino. | |
| 388d6c51 | 181 | |
| 1da177e4 | 182 | For details, take a look at <file:Documentation/cpu-freq/>. |
| 388d6c51 | 183 | |
| 1da177e4 LT |
184 | If in doubt, say N. |
| 185 | ||
| 1da177e4 LT |
186 | config X86_SPEEDSTEP_CENTRINO_TABLE |
| 187 | bool "Built-in tables for Banias CPUs" | |
| e8ef9522 | 188 | depends on X86_32 && X86_SPEEDSTEP_CENTRINO |
| 1da177e4 LT |
189 | default y |
| 190 | help | |
| 191 | Use built-in tables for Banias CPUs if ACPI encoding | |
| 192 | is not available. | |
| 193 | ||
| 194 | If in doubt, say N. | |
| 195 | ||
| 196 | config X86_SPEEDSTEP_ICH | |
| 197 | tristate "Intel Speedstep on ICH-M chipsets (ioport interface)" | |
| e8ef9522 | 198 | depends on X86_32 |
| 1da177e4 LT |
199 | help |
| 200 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
| 201 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all | |
| 388d6c51 | 202 | mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2, |
| 1da177e4 LT |
203 | ICH3 or ICH4 southbridge. |
| 204 | ||
| 205 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 206 | ||
| 207 | If in doubt, say N. | |
| 208 | ||
| 209 | config X86_SPEEDSTEP_SMI | |
| 210 | tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)" | |
| 0f194b56 | 211 | depends on X86_32 |
| 1da177e4 LT |
212 | help |
| 213 | This adds the CPUFreq driver for certain mobile Intel Pentium III | |
| 388d6c51 | 214 | (Coppermine), all mobile Intel Pentium III-M (Tualatin) |
| 1da177e4 LT |
215 | on systems which have an Intel 440BX/ZX/MX southbridge. |
| 216 | ||
| 217 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 218 | ||
| 219 | If in doubt, say N. | |
| 220 | ||
| 221 | config X86_P4_CLOCKMOD | |
| 222 | tristate "Intel Pentium 4 clock modulation" | |
| 1da177e4 LT |
223 | help |
| 224 | This adds the CPUFreq driver for Intel Pentium 4 / XEON | |
| e8ef9522 SR |
225 | processors. When enabled it will lower CPU temperature by skipping |
| 226 | clocks. | |
| 227 | ||
| 228 | This driver should be only used in exceptional | |
| 229 | circumstances when very low power is needed because it causes severe | |
| 230 | slowdowns and noticeable latencies. Normally Speedstep should be used | |
| 231 | instead. | |
| 232 | ||
| 233 | To compile this driver as a module, choose M here: the | |
| 234 | module will be called p4-clockmod. | |
| 1da177e4 LT |
235 | |
| 236 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 237 | ||
| e8ef9522 | 238 | Unless you are absolutely sure say N. |
| 1da177e4 LT |
239 | |
| 240 | config X86_CPUFREQ_NFORCE2 | |
| 241 | tristate "nVidia nForce2 FSB changing" | |
| 0f194b56 | 242 | depends on X86_32 |
| 1da177e4 LT |
243 | help |
| 244 | This adds the CPUFreq driver for FSB changing on nVidia nForce2 | |
| 245 | platforms. | |
| 246 | ||
| 247 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 248 | ||
| 249 | If in doubt, say N. | |
| 250 | ||
| 251 | config X86_LONGRUN | |
| 252 | tristate "Transmeta LongRun" | |
| e8ef9522 | 253 | depends on X86_32 |
| 1da177e4 LT |
254 | help |
| 255 | This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors | |
| 256 | which support LongRun. | |
| 257 | ||
| 258 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 259 | ||
| 260 | If in doubt, say N. | |
| 261 | ||
| 262 | config X86_LONGHAUL | |
| 263 | tristate "VIA Cyrix III Longhaul" | |
| e8ef9522 | 264 | depends on X86_32 && ACPI_PROCESSOR |
| 1da177e4 | 265 | help |
| 388d6c51 DJ |
266 | This adds the CPUFreq driver for VIA Samuel/CyrixIII, |
| 267 | VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T | |
| 1da177e4 LT |
268 | processors. |
| 269 | ||
| 270 | For details, take a look at <file:Documentation/cpu-freq/>. | |
| 271 | ||
| 272 | If in doubt, say N. | |
| 273 | ||