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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_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
54config 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
71config 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
87config 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
103config 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
115config 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
130config 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
141config 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
152config 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
162config 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
169config 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
181config 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
198config 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
209config 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
228config 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
238config 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
251config 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
263config 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
282config 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
293config 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
304config 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
316config 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
327comment "shared options"
328
329config X86_SPEEDSTEP_LIB
330 tristate
331 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
332
333config 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
1#
2# x86 CPU Frequency scaling drivers
3#
4
5config X86_PCC_CPUFREQ
6 tristate "Processor Clocking Control interface driver"
7 depends on ACPI && ACPI_PROCESSOR
8 help
9 This driver adds support for the PCC interface.
10
11 For details, take a look at:
12 <file:Documentation/cpu-freq/pcc-cpufreq.txt>.
13
14 To compile this driver as a module, choose M here: the
15 module will be called pcc-cpufreq.
16
17 If in doubt, say N.
18
19config X86_ACPI_CPUFREQ
20 tristate "ACPI Processor P-States driver"
21 select CPU_FREQ_TABLE
22 depends on ACPI_PROCESSOR
23 help
24 This driver adds a CPUFreq driver which utilizes the ACPI
25 Processor Performance States.
26 This driver also supports Intel Enhanced Speedstep.
27
28 To compile this driver as a module, choose M here: the
29 module will be called acpi-cpufreq.
30
31 For details, take a look at <file:Documentation/cpu-freq/>.
32
33 If in doubt, say N.
34
35config ELAN_CPUFREQ
36 tristate "AMD Elan SC400 and SC410"
37 select CPU_FREQ_TABLE
38 depends on MELAN
39 ---help---
40 This adds the CPUFreq driver for AMD Elan SC400 and SC410
41 processors.
42
43 You need to specify the processor maximum speed as boot
44 parameter: elanfreq=maxspeed (in kHz) or as module
45 parameter "max_freq".
46
47 For details, take a look at <file:Documentation/cpu-freq/>.
48
49 If in doubt, say N.
50
51config SC520_CPUFREQ
52 tristate "AMD Elan SC520"
53 select CPU_FREQ_TABLE
54 depends on MELAN
55 ---help---
56 This adds the CPUFreq driver for AMD Elan SC520 processor.
57
58 For details, take a look at <file:Documentation/cpu-freq/>.
59
60 If in doubt, say N.
61
62
63config X86_POWERNOW_K6
64 tristate "AMD Mobile K6-2/K6-3 PowerNow!"
65 select CPU_FREQ_TABLE
66 depends on X86_32
67 help
68 This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
69 AMD K6-3+ processors.
70
71 For details, take a look at <file:Documentation/cpu-freq/>.
72
73 If in doubt, say N.
74
75config X86_POWERNOW_K7
76 tristate "AMD Mobile Athlon/Duron PowerNow!"
77 select CPU_FREQ_TABLE
78 depends on X86_32
79 help
80 This adds the CPUFreq driver for mobile AMD K7 mobile processors.
81
82 For details, take a look at <file:Documentation/cpu-freq/>.
83
84 If in doubt, say N.
85
86config X86_POWERNOW_K7_ACPI
87 bool
88 depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
89 depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
90 depends on X86_32
91 default y
92
93config X86_POWERNOW_K8
94 tristate "AMD Opteron/Athlon64 PowerNow!"
95 select CPU_FREQ_TABLE
96 depends on ACPI && ACPI_PROCESSOR
97 help
98 This adds the CPUFreq driver for K8/K10 Opteron/Athlon64 processors.
99
100 To compile this driver as a module, choose M here: the
101 module will be called powernow-k8.
102
103 For details, take a look at <file:Documentation/cpu-freq/>.
104
105config X86_GX_SUSPMOD
106 tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
107 depends on X86_32 && PCI
108 help
109 This add the CPUFreq driver for NatSemi Geode processors which
110 support suspend modulation.
111
112 For details, take a look at <file:Documentation/cpu-freq/>.
113
114 If in doubt, say N.
115
116config X86_SPEEDSTEP_CENTRINO
117 tristate "Intel Enhanced SpeedStep (deprecated)"
118 select CPU_FREQ_TABLE
119 select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
120 depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
121 help
122 This is deprecated and this functionality is now merged into
123 acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
124 speedstep_centrino.
125 This adds the CPUFreq driver for Enhanced SpeedStep enabled
126 mobile CPUs. This means Intel Pentium M (Centrino) CPUs
127 or 64bit enabled Intel Xeons.
128
129 To compile this driver as a module, choose M here: the
130 module will be called speedstep-centrino.
131
132 For details, take a look at <file:Documentation/cpu-freq/>.
133
134 If in doubt, say N.
135
136config X86_SPEEDSTEP_CENTRINO_TABLE
137 bool "Built-in tables for Banias CPUs"
138 depends on X86_32 && X86_SPEEDSTEP_CENTRINO
139 default y
140 help
141 Use built-in tables for Banias CPUs if ACPI encoding
142 is not available.
143
144 If in doubt, say N.
145
146config X86_SPEEDSTEP_ICH
147 tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
148 select CPU_FREQ_TABLE
149 depends on X86_32
150 help
151 This adds the CPUFreq driver for certain mobile Intel Pentium III
152 (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
153 mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
154 ICH3 or ICH4 southbridge.
155
156 For details, take a look at <file:Documentation/cpu-freq/>.
157
158 If in doubt, say N.
159
160config X86_SPEEDSTEP_SMI
161 tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
162 select CPU_FREQ_TABLE
163 depends on X86_32 && EXPERIMENTAL
164 help
165 This adds the CPUFreq driver for certain mobile Intel Pentium III
166 (Coppermine), all mobile Intel Pentium III-M (Tualatin)
167 on systems which have an Intel 440BX/ZX/MX southbridge.
168
169 For details, take a look at <file:Documentation/cpu-freq/>.
170
171 If in doubt, say N.
172
173config X86_P4_CLOCKMOD
174 tristate "Intel Pentium 4 clock modulation"
175 select CPU_FREQ_TABLE
176 help
177 This adds the CPUFreq driver for Intel Pentium 4 / XEON
178 processors. When enabled it will lower CPU temperature by skipping
179 clocks.
180
181 This driver should be only used in exceptional
182 circumstances when very low power is needed because it causes severe
183 slowdowns and noticeable latencies. Normally Speedstep should be used
184 instead.
185
186 To compile this driver as a module, choose M here: the
187 module will be called p4-clockmod.
188
189 For details, take a look at <file:Documentation/cpu-freq/>.
190
191 Unless you are absolutely sure say N.
192
193config X86_CPUFREQ_NFORCE2
194 tristate "nVidia nForce2 FSB changing"
195 depends on X86_32 && EXPERIMENTAL
196 help
197 This adds the CPUFreq driver for FSB changing on nVidia nForce2
198 platforms.
199
200 For details, take a look at <file:Documentation/cpu-freq/>.
201
202 If in doubt, say N.
203
204config X86_LONGRUN
205 tristate "Transmeta LongRun"
206 depends on X86_32
207 help
208 This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
209 which support LongRun.
210
211 For details, take a look at <file:Documentation/cpu-freq/>.
212
213 If in doubt, say N.
214
215config X86_LONGHAUL
216 tristate "VIA Cyrix III Longhaul"
217 select CPU_FREQ_TABLE
218 depends on X86_32 && ACPI_PROCESSOR
219 help
220 This adds the CPUFreq driver for VIA Samuel/CyrixIII,
221 VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
222 processors.
223
224 For details, take a look at <file:Documentation/cpu-freq/>.
225
226 If in doubt, say N.
227
228config X86_E_POWERSAVER
229 tristate "VIA C7 Enhanced PowerSaver (DANGEROUS)"
230 select CPU_FREQ_TABLE
231 depends on X86_32 && EXPERIMENTAL
232 help
233 This adds the CPUFreq driver for VIA C7 processors. However, this driver
234 does not have any safeguards to prevent operating the CPU out of spec
235 and is thus considered dangerous. Please use the regular ACPI cpufreq
236 driver, enabled by CONFIG_X86_ACPI_CPUFREQ.
237
238 If in doubt, say N.
239
240comment "shared options"
241
242config X86_SPEEDSTEP_LIB
243 tristate
244 default (X86_SPEEDSTEP_ICH || X86_SPEEDSTEP_SMI || X86_P4_CLOCKMOD)
245
246config X86_SPEEDSTEP_RELAXED_CAP_CHECK
247 bool "Relaxed speedstep capability checks"
248 depends on X86_32 && (X86_SPEEDSTEP_SMI || X86_SPEEDSTEP_ICH)
249 help
250 Don't perform all checks for a speedstep capable system which would
251 normally be done. Some ancient or strange systems, though speedstep
252 capable, don't always indicate that they are speedstep capable. This
253 option lets the probing code bypass some of those checks if the
254 parameter "relaxed_check=1" is passed to the module.
255