[linux-block.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_AMD_PSTATE
	tristate "AMD Processor P-State driver"
	depends on X86 && ACPI
	select ACPI_PROCESSOR
	select ACPI_CPPC_LIB if X86_64
	select CPU_FREQ_GOV_SCHEDUTIL if SMP
	help
	  This driver adds a CPUFreq driver which utilizes a fine grain
	  processor performance frequency control range instead of legacy
	  performance levels. _CPC needs to be present in the ACPI tables
	  of the system.

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

	  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	  file has now been superseded by the more generic "boost" entry.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 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
ec437d71 HR	37	config X86_AMD_PSTATE
ec437d71 HR	38	tristate "AMD Processor P-State driver"
a2e6840b HR	39	depends on X86 && ACPI
	40	select ACPI_PROCESSOR
	41	select ACPI_CPPC_LIB if X86_64
ec437d71 HR	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
1da177e4 LT	54	config X86_ACPI_CPUFREQ
1da177e4 LT	55	tristate "ACPI Processor P-States driver"
1da177e4 LT	56	depends on ACPI_PROCESSOR
	57	help
	58	This driver adds a CPUFreq driver which utilizes the ACPI
	59	Processor Performance States.
3dc9a633 MG	60	This driver also supports Intel Enhanced Speedstep and newer
3dc9a633 MG	61	AMD CPUs.
1da177e4	62
e8ef9522 SR	63	To compile this driver as a module, choose M here: the
	64	module will be called acpi-cpufreq.
	65
1da177e4 LT	66	For details, take a look at <file:Documentation/cpu-freq/>.
	67
	68	If in doubt, say N.
	69
11269ff5 AP	70	config X86_ACPI_CPUFREQ_CPB
	71	default y
	72	bool "Legacy cpb sysfs knob support for AMD CPUs"
	73	depends on X86_ACPI_CPUFREQ && CPU_SUP_AMD
	74	help
	75	The powernow-k8 driver used to provide a sysfs knob called "cpb"
	76	to disable the Core Performance Boosting feature of AMD CPUs. This
735dc249	77	file has now been superseded by the more generic "boost" entry.
11269ff5 AP	78
	79	By enabling this option the acpi_cpufreq driver provides the old
	80	entry in addition to the new boost ones, for compatibility reasons.
	81
1da177e4	82	config ELAN_CPUFREQ
bf6fc9fd	83	tristate "AMD Elan SC400 and SC410"
ce9c99af	84	depends on MELAN
a7f7f624	85	help
1da177e4 LT	86	This adds the CPUFreq driver for AMD Elan SC400 and SC410
	87	processors.
	88
	89	You need to specify the processor maximum speed as boot
	90	parameter: elanfreq=maxspeed (in kHz) or as module
	91	parameter "max_freq".
	92
	93	For details, take a look at <file:Documentation/cpu-freq/>.
	94
	95	If in doubt, say N.
	96
bf6fc9fd DJ	97	config SC520_CPUFREQ
bf6fc9fd DJ	98	tristate "AMD Elan SC520"
ce9c99af	99	depends on MELAN
a7f7f624	100	help
bf6fc9fd DJ	101	This adds the CPUFreq driver for AMD Elan SC520 processor.
	102
	103	For details, take a look at <file:Documentation/cpu-freq/>.
	104
	105	If in doubt, say N.
	106
	107
1da177e4 LT	108	config X86_POWERNOW_K6
1da177e4 LT	109	tristate "AMD Mobile K6-2/K6-3 PowerNow!"
e8ef9522	110	depends on X86_32
1da177e4 LT	111	help
	112	This adds the CPUFreq driver for mobile AMD K6-2+ and mobile
	113	AMD K6-3+ processors.
	114
	115	For details, take a look at <file:Documentation/cpu-freq/>.
	116
	117	If in doubt, say N.
	118
	119	config X86_POWERNOW_K7
	120	tristate "AMD Mobile Athlon/Duron PowerNow!"
e8ef9522	121	depends on X86_32
1da177e4 LT	122	help
	123	This adds the CPUFreq driver for mobile AMD K7 mobile processors.
	124
	125	For details, take a look at <file:Documentation/cpu-freq/>.
	126
	127	If in doubt, say N.
	128
	129	config X86_POWERNOW_K7_ACPI
	130	bool
	131	depends on X86_POWERNOW_K7 && ACPI_PROCESSOR
	132	depends on !(X86_POWERNOW_K7 = y && ACPI_PROCESSOR = m)
e8ef9522	133	depends on X86_32
1da177e4 LT	134	default y
	135
	136	config X86_POWERNOW_K8
	137	tristate "AMD Opteron/Athlon64 PowerNow!"
631e8ac1	138	depends on ACPI && ACPI_PROCESSOR && X86_ACPI_CPUFREQ
1da177e4	139	help
034be8fd AP	140	This adds the CPUFreq driver for K8/early Opteron/Athlon64 processors.
034be8fd AP	141	Support for K10 and newer processors is now in acpi-cpufreq.
1da177e4	142
e8ef9522 SR	143	To compile this driver as a module, choose M here: the
	144	module will be called powernow-k8.
	145
1da177e4 LT	146	For details, take a look at <file:Documentation/cpu-freq/>.
1da177e4 LT	147
9c5320c8 JS	148	config X86_AMD_FREQ_SENSITIVITY
	149	tristate "AMD frequency sensitivity feedback powersave bias"
	150	depends on CPU_FREQ_GOV_ONDEMAND && X86_ACPI_CPUFREQ && CPU_SUP_AMD
	151	help
	152	This adds AMD-specific powersave bias function to the ondemand
	153	governor, which allows it to make more power-conscious frequency
8c88126b	154	change decisions based on feedback from hardware (available on AMD
9c5320c8 JS	155	Family 16h and above).
	156
	157	Hardware feedback tells software how "sensitive" to frequency changes
	158	the CPUs' workloads are. CPU-bound workloads will be more sensitive
	159	-- they will perform better as frequency increases. Memory/IO-bound
	160	workloads will be less sensitive -- they will not necessarily perform
	161	better as frequency increases.
	162
	163	If in doubt, say N.
	164
1da177e4 LT	165	config X86_GX_SUSPMOD
1da177e4 LT	166	tristate "Cyrix MediaGX/NatSemi Geode Suspend Modulation"
e8ef9522	167	depends on X86_32 && PCI
1da177e4 LT	168	help
	169	This add the CPUFreq driver for NatSemi Geode processors which
	170	support suspend modulation.
	171
	172	For details, take a look at <file:Documentation/cpu-freq/>.
	173
	174	If in doubt, say N.
	175
	176	config X86_SPEEDSTEP_CENTRINO
e8ef9522	177	tristate "Intel Enhanced SpeedStep (deprecated)"
e8ef9522 SR	178	select X86_SPEEDSTEP_CENTRINO_TABLE if X86_32
e8ef9522 SR	179	depends on X86_32 \|\| (X86_64 && ACPI_PROCESSOR)
1da177e4	180	help
e8ef9522 SR	181	This is deprecated and this functionality is now merged into
	182	acpi_cpufreq (X86_ACPI_CPUFREQ). Use that driver instead of
	183	speedstep_centrino.
1da177e4	184	This adds the CPUFreq driver for Enhanced SpeedStep enabled
e8ef9522 SR	185	mobile CPUs. This means Intel Pentium M (Centrino) CPUs
	186	or 64bit enabled Intel Xeons.
	187
	188	To compile this driver as a module, choose M here: the
	189	module will be called speedstep-centrino.
388d6c51	190
1da177e4	191	For details, take a look at <file:Documentation/cpu-freq/>.
388d6c51	192
1da177e4 LT	193	If in doubt, say N.
1da177e4 LT	194
1da177e4 LT	195	config X86_SPEEDSTEP_CENTRINO_TABLE
1da177e4 LT	196	bool "Built-in tables for Banias CPUs"
e8ef9522	197	depends on X86_32 && X86_SPEEDSTEP_CENTRINO
1da177e4 LT	198	default y
	199	help
	200	Use built-in tables for Banias CPUs if ACPI encoding
	201	is not available.
	202
	203	If in doubt, say N.
	204
	205	config X86_SPEEDSTEP_ICH
	206	tristate "Intel Speedstep on ICH-M chipsets (ioport interface)"
e8ef9522	207	depends on X86_32
1da177e4 LT	208	help
	209	This adds the CPUFreq driver for certain mobile Intel Pentium III
	210	(Coppermine), all mobile Intel Pentium III-M (Tualatin) and all
388d6c51	211	mobile Intel Pentium 4 P4-M on systems which have an Intel ICH2,
1da177e4 LT	212	ICH3 or ICH4 southbridge.
	213
	214	For details, take a look at <file:Documentation/cpu-freq/>.
	215
	216	If in doubt, say N.
	217
	218	config X86_SPEEDSTEP_SMI
	219	tristate "Intel SpeedStep on 440BX/ZX/MX chipsets (SMI interface)"
0f194b56	220	depends on X86_32
1da177e4 LT	221	help
1da177e4 LT	222	This adds the CPUFreq driver for certain mobile Intel Pentium III
388d6c51	223	(Coppermine), all mobile Intel Pentium III-M (Tualatin)
1da177e4 LT	224	on systems which have an Intel 440BX/ZX/MX southbridge.
	225
	226	For details, take a look at <file:Documentation/cpu-freq/>.
	227
	228	If in doubt, say N.
	229
	230	config X86_P4_CLOCKMOD
	231	tristate "Intel Pentium 4 clock modulation"
1da177e4 LT	232	help
1da177e4 LT	233	This adds the CPUFreq driver for Intel Pentium 4 / XEON
e8ef9522 SR	234	processors. When enabled it will lower CPU temperature by skipping
	235	clocks.
	236
	237	This driver should be only used in exceptional
	238	circumstances when very low power is needed because it causes severe
	239	slowdowns and noticeable latencies. Normally Speedstep should be used
	240	instead.
	241
	242	To compile this driver as a module, choose M here: the
	243	module will be called p4-clockmod.
1da177e4 LT	244
	245	For details, take a look at <file:Documentation/cpu-freq/>.
	246
e8ef9522	247	Unless you are absolutely sure say N.
1da177e4 LT	248
	249	config X86_CPUFREQ_NFORCE2
	250	tristate "nVidia nForce2 FSB changing"
0f194b56	251	depends on X86_32
1da177e4 LT	252	help
	253	This adds the CPUFreq driver for FSB changing on nVidia nForce2
	254	platforms.
	255
	256	For details, take a look at <file:Documentation/cpu-freq/>.
	257
	258	If in doubt, say N.
	259
	260	config X86_LONGRUN
	261	tristate "Transmeta LongRun"
e8ef9522	262	depends on X86_32
1da177e4 LT	263	help
	264	This adds the CPUFreq driver for Transmeta Crusoe and Efficeon processors
	265	which support LongRun.
	266
	267	For details, take a look at <file:Documentation/cpu-freq/>.
	268
	269	If in doubt, say N.
	270
	271	config X86_LONGHAUL
	272	tristate "VIA Cyrix III Longhaul"
e8ef9522	273	depends on X86_32 && ACPI_PROCESSOR
1da177e4	274	help
388d6c51 DJ	275	This adds the CPUFreq driver for VIA Samuel/CyrixIII,
388d6c51 DJ	276	VIA Cyrix Samuel/C3, VIA Cyrix Ezra and VIA Cyrix Ezra-T
1da177e4 LT	277	processors.
	278
	279	For details, take a look at <file:Documentation/cpu-freq/>.
	280
	281	If in doubt, say N.
	282