[mirror_ubuntu-jammy-kernel.git] / drivers / cpufreq / Kconfig.x86

# SPDX-License-Identifier: GPL-2.0-only
#
# x86 CPU Frequency scaling drivers
#

config X86_INTEL_PSTATE
	bool "Intel P state control"
	depends on X86
	select ACPI_PROCESSOR if ACPI
	select ACPI_CPPC_LIB if X86_64 && ACPI && SCHED_MC_PRIO
	select CPU_FREQ_GOV_PERFORMANCE
	select CPU_FREQ_GOV_SCHEDUTIL if SMP
	help
	  This driver provides a P state for Intel core processors.
	  The driver implements an internal governor and will become
	  the scaling driver and governor for Sandy bridge processors.

	  When this driver is enabled it will become the preferred
	  scaling driver for Sandy bridge processors.

	  If in doubt, say N.

config X86_PCC_CPUFREQ
	tristate "Processor Clocking Control interface driver"
	depends on ACPI && ACPI_PROCESSOR
	help
	  This driver adds support for the PCC interface.

	  For details, take a look at:
	  <file:Documentation/admin-guide/pm/cpufreq_drivers.rst>.

	  To compile this driver as a module, choose M here: the
	  module will be called pcc-cpufreq.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ
	tristate "ACPI Processor P-States driver"
	depends on ACPI_PROCESSOR
	help
	  This driver adds a CPUFreq driver which utilizes the ACPI
	  Processor Performance States.
	  This driver also supports Intel Enhanced Speedstep and newer
	  AMD CPUs.

	  To compile this driver as a module, choose M here: the
	  module will be called acpi-cpufreq.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_ACPI_CPUFREQ_CPB
	default y
	bool "Legacy cpb sysfs knob support for AMD CPUs"
	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  The powernow-k8 driver used to provide a sysfs knob called "cpb"
	  to disable the Core Performance Boosting feature of AMD CPUs. This
	  file has now been superseded by the more generic "boost" entry.

	  By enabling this option the acpi_cpufreq driver provides the old
	  entry in addition to the new boost ones, for compatibility reasons.

config X86_SFI_CPUFREQ
	tristate "SFI Performance-States driver"
	depends on X86_INTEL_MID && SFI
	help
	  This adds a CPUFreq driver for some Silvermont based Intel Atom
	  architectures like Z34xx and Z35xx which enumerate processor
	  performance states through SFI.

	  If in doubt, say N.

config ELAN_CPUFREQ
	tristate "AMD Elan SC400 and SC410"
	depends on MELAN
	help
	  This adds the CPUFreq driver for AMD Elan SC400 and SC410
	  processors.

	  You need to specify the processor maximum speed as boot
	  parameter: elanfreq=maxspeed (in kHz) or as module
	  parameter "max_freq".

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config SC520_CPUFREQ
	tristate "AMD Elan SC520"
	depends on MELAN
	help
	  This adds the CPUFreq driver for AMD Elan SC520 processor.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.


config X86_POWERNOW_K6
	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	  AMD K6-3+ processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7
	tristate "AMD Mobile Athlon/Duron PowerNow!"
	depends on X86_32
	help
	  This adds the CPUFreq driver for mobile AMD K7 mobile processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_POWERNOW_K7_ACPI
	bool
	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
	depends on X86_32
	default y

config X86_POWERNOW_K8
	tristate "AMD Opteron/Athlon64 PowerNow!"
	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
	help
	  This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
	  Support for K10 and newer processors is now in acpi-cpufreq.

	  To compile this driver as a module, choose M here: the
	  module will be called powernow-k8.

	  For details, take a look at <file:Documentation/cpu-freq/>.

config X86_AMD_FREQ_SENSITIVITY
	tristate "AMD frequency sensitivity feedback powersave bias"
	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	help
	  This adds AMD-specific powersave bias function to the ondemand
	  governor, which allows it to make more power-conscious frequency
	  change decisions based on feedback from hardware (available on AMD
	  Family 16h and above).

	  Hardware feedback tells software how "sensitive" to frequency changes
	  the CPUs' workloads are. CPU-bound workloads will be more sensitive
	  -- they will perform better as frequency increases. Memory/IO-bound
	  workloads will be less sensitive -- they will not necessarily perform
	  better as frequency increases.

	  If in doubt, say N.

config X86_GX_SUSPMOD
	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
	depends on X86_32 && PCI
	help
	 This add the CPUFreq driver for NatSemi Geode processors which
	 support suspend modulation.

	 For details, take a look at <file:Documentation/cpu-freq/>.

	 If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO
	tristate "Intel Enhanced SpeedStep (deprecated)"
	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
	depends on X86_32 || (X86_64 && ACPI_PROCESSOR)
	help
	  This is deprecated and this functionality is now merged into
	  acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	  speedstep_centrino.
	  This adds the CPUFreq driver for Enhanced SpeedStep enabled
	  mobile CPUs.  This means Intel Pentium M (Centrino) CPUs
	  or 64bit enabled Intel Xeons.

	  To compile this driver as a module, choose M here: the
	  module will be called speedstep-centrino.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_CENTRINO_TABLE
	bool "Built-in tables for Banias CPUs"
	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
	default y
	help
	  Use built-in tables for Banias CPUs if ACPI encoding
	  is not available.

	  If in doubt, say N.

config X86_SPEEDSTEP_ICH
	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
	  mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
	  ICH3 or ICH4 southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_SPEEDSTEP_SMI
	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
	depends on X86_32
	help
	  This adds the CPUFreq driver for certain mobile Intel Pentium III
	  (Coppermine), all mobile Intel Pentium III-M (Tualatin)
	  on systems which have an Intel 440BX/ZX/MX southbridge.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_P4_CLOCKMOD
	tristate "Intel Pentium 4 clock modulation"
	help
	  This adds the CPUFreq driver for Intel Pentium 4 / XEON
	  processors.  When enabled it will lower CPU temperature by skipping
	  clocks.

	  This driver should be only used in exceptional
	  circumstances when very low power is needed because it causes severe
	  slowdowns and noticeable latencies.  Normally Speedstep should be used
	  instead.

	  To compile this driver as a module, choose M here: the
	  module will be called p4-clockmod.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  Unless you are absolutely sure say N.

config X86_CPUFREQ_NFORCE2
	tristate "nVidia nForce2 FSB changing"
	depends on X86_32
	help
	  This adds the CPUFreq driver for FSB changing on nVidia nForce2
	  platforms.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGRUN
	tristate "Transmeta LongRun"
	depends on X86_32
	help
	  This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	  which support LongRun.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.

config X86_LONGHAUL
	tristate "VIA Cyrix III Longhaul"
	depends on X86_32 && ACPI_PROCESSOR
	help
	  This adds the CPUFreq driver for VIA Samuel/CyrixIII,
	  VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
	  processors.

	  For details, take a look at <file:Documentation/cpu-freq/>.

	  If in doubt, say N.
Commit	Line	Data
ec8f24b7	1	# SPDX-License-Identifier: GPL-2.0-only
1da177e4	2	#
bb0a56ec	3	# x86 CPU Frequency scaling drivers
1da177e4 LT	4	#
1da177e4 LT	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
a00ec387 RW	11	select CPU_FREQ_GOV_PERFORMANCE
a00ec387 RW	12	select CPU_FREQ_GOV_SCHEDUTIL if SMP
cde10f85 KK	13	help
cde10f85 KK	14	This driver provides a P state for Intel core processors.
93f0822d	15	The driver implements an internal governor and will become
cde10f85	16	the scaling driver and governor for Sandy bridge processors.
93f0822d	17
735dc249	18	When this driver is enabled it will become the preferred
cde10f85	19	scaling driver for Sandy bridge processors.
93f0822d	20
93f0822d DB	21	If in doubt, say N.
93f0822d DB	22
0f1d683f NC	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:
c3419b71	30	<file:Documentation/admin-guide/pm/cpufreq_drivers.rst>.
0f1d683f NC	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
1da177e4 LT	37	config X86_ACPI_CPUFREQ
1da177e4 LT	38	tristate "ACPI Processor P-States driver"
1da177e4 LT	39	depends on ACPI_PROCESSOR
	40	help
	41	This driver adds a CPUFreq driver which utilizes the ACPI
	42	Processor Performance States.
3dc9a633 MG	43	This driver also supports Intel Enhanced Speedstep and newer
3dc9a633 MG	44	AMD CPUs.
1da177e4	45
e8ef9522 SR	46	To compile this driver as a module, choose M here: the
	47	module will be called acpi-cpufreq.
	48
1da177e4 LT	49	For details, take a look at <file:Documentation/cpu-freq/>.
	50
	51	If in doubt, say N.
	52
11269ff5 AP	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
735dc249	60	file has now been superseded by the more generic "boost" entry.
11269ff5 AP	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
e7ddf4b7 SK	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
1da177e4	75	config ELAN_CPUFREQ
bf6fc9fd	76	tristate "AMD Elan SC400 and SC410"
ce9c99af	77	depends on MELAN
a7f7f624	78	help
1da177e4 LT	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
bf6fc9fd DJ	90	config SC520_CPUFREQ
bf6fc9fd DJ	91	tristate "AMD Elan SC520"
ce9c99af	92	depends on MELAN
a7f7f624	93	help
bf6fc9fd DJ	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
1da177e4 LT	101	config X86_POWERNOW_K6
1da177e4 LT	102	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
e8ef9522	103	depends on X86_32
1da177e4 LT	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!"
e8ef9522	114	depends on X86_32
1da177e4 LT	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)
e8ef9522	126	depends on X86_32
1da177e4 LT	127	default y
	128
	129	config X86_POWERNOW_K8
	130	tristate "AMD Opteron/Athlon64 PowerNow!"
631e8ac1	131	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	132	help
034be8fd AP	133	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	134	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	135
e8ef9522 SR	136	To compile this driver as a module, choose M here: the
	137	module will be called powernow-k8.
	138
1da177e4 LT	139	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	140
9c5320c8 JS	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
8c88126b	147	change decisions based on feedback from hardware (available on AMD
9c5320c8 JS	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
1da177e4 LT	158	config X86_GX_SUSPMOD
1da177e4 LT	159	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	160	depends on X86_32 && PCI
1da177e4 LT	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
e8ef9522	170	tristate "Intel Enhanced SpeedStep (deprecated)"
e8ef9522 SR	171	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	172	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	173	help
e8ef9522 SR	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.
1da177e4	177	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	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.
388d6c51	183
1da177e4	184	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	185
1da177e4 LT	186	If in doubt, say N.
1da177e4 LT	187
1da177e4 LT	188	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	189	bool "Built-in tables for Banias CPUs"
e8ef9522	190	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	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)"
e8ef9522	200	depends on X86_32
1da177e4 LT	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
388d6c51	204	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	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)"
0f194b56	213	depends on X86_32
1da177e4 LT	214	help
1da177e4 LT	215	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	216	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	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"
1da177e4 LT	225	help
1da177e4 LT	226	This adds the CPUFreq driver for Intel Pentium 4 / XEON
e8ef9522 SR	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.
1da177e4 LT	237
	238	For details, take a look at <file:Documentation/cpu-freq/>.
	239
e8ef9522	240	Unless you are absolutely sure say N.
1da177e4 LT	241
	242	config X86_CPUFREQ_NFORCE2
	243	tristate "nVidia nForce2 FSB changing"
0f194b56	244	depends on X86_32
1da177e4 LT	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"
e8ef9522	255	depends on X86_32
1da177e4 LT	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"
e8ef9522	266	depends on X86_32 && ACPI_PROCESSOR
1da177e4	267	help
388d6c51 DJ	268	This adds the CPUFreq driver for VIA Samuel/CyrixIII,
388d6c51 DJ	269	VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
1da177e4 LT	270	processors.
	271
	272	For details, take a look at <file:Documentation/cpu-freq/>.
	273
	274	If in doubt, say N.
	275