[linux-2.6-block.git] / drivers / pci / Kconfig

# SPDX-License-Identifier: GPL-2.0
#
# PCI configuration
#

# select this to offer the PCI prompt
config HAVE_PCI
	bool

# select this to unconditionally force on PCI support
config FORCE_PCI
	bool
	select HAVE_PCI
	select PCI

# select this to provide a generic PCI iomap,
# without PCI itself having to be defined
config GENERIC_PCI_IOMAP
	bool

menuconfig PCI
	bool "PCI support"
	depends on HAVE_PCI
	help
	  This option enables support for the PCI local bus, including
	  support for PCI-X and the foundations for PCI Express support.
	  Say 'Y' here unless you know what you are doing.

if PCI

config PCI_DOMAINS
	bool
	depends on PCI

config PCI_DOMAINS_GENERIC
	bool
	select PCI_DOMAINS

config PCI_SYSCALL
	bool

source "drivers/pci/pcie/Kconfig"

config PCI_MSI
	bool "Message Signaled Interrupts (MSI and MSI-X)"
	select GENERIC_MSI_IRQ
	help
	   This allows device drivers to enable MSI (Message Signaled
	   Interrupts).  Message Signaled Interrupts enable a device to
	   generate an interrupt using an inbound Memory Write on its
	   PCI bus instead of asserting a device IRQ pin.

	   Use of PCI MSI interrupts can be disabled at kernel boot time
	   by using the 'pci=nomsi' option.  This disables MSI for the
	   entire system.

	   If you don't know what to do here, say Y.

config PCI_MSI_ARCH_FALLBACKS
	bool

config PCI_QUIRKS
	default y
	bool "Enable PCI quirk workarounds" if EXPERT
	help
	  This enables workarounds for various PCI chipset bugs/quirks.
	  Disable this only if your target machine is unaffected by PCI
	  quirks.

config PCI_DEBUG
	bool "PCI Debugging"
	depends on DEBUG_KERNEL
	help
	  Say Y here if you want the PCI core to produce a bunch of debug
	  messages to the system log.  Select this if you are having a
	  problem with PCI support and want to see more of what is going on.

	  When in doubt, say N.

config PCI_REALLOC_ENABLE_AUTO
	bool "Enable PCI resource re-allocation detection"
	depends on PCI_IOV
	help
	  Say Y here if you want the PCI core to detect if PCI resource
	  re-allocation needs to be enabled. You can always use pci=realloc=on
	  or pci=realloc=off to override it.  It will automatically
	  re-allocate PCI resources if SR-IOV BARs have not been allocated by
	  the BIOS.

	  When in doubt, say N.

config PCI_STUB
	tristate "PCI Stub driver"
	help
	  Say Y or M here if you want be able to reserve a PCI device
	  when it is going to be assigned to a guest operating system.

	  When in doubt, say N.

config PCI_PF_STUB
	tristate "PCI PF Stub driver"
	depends on PCI_IOV
	help
	  Say Y or M here if you want to enable support for devices that
	  require SR-IOV support, while at the same time the PF (Physical
	  Function) itself is not providing any actual services on the
	  host itself such as storage or networking.

	  When in doubt, say N.

config XEN_PCIDEV_FRONTEND
	tristate "Xen PCI Frontend"
	depends on XEN_PV
	select PCI_XEN
	select XEN_XENBUS_FRONTEND
	default y
	help
	  The PCI device frontend driver allows the kernel to import arbitrary
	  PCI devices from a PCI backend to support PCI driver domains.

config PCI_ATS
	bool

config PCI_DOE
	bool

config PCI_ECAM
	bool

config PCI_LOCKLESS_CONFIG
	bool

config PCI_BRIDGE_EMUL
	bool

config PCI_IOV
	bool "PCI IOV support"
	select PCI_ATS
	help
	  I/O Virtualization is a PCI feature supported by some devices
	  which allows them to create virtual devices which share their
	  physical resources.

	  If unsure, say N.

config PCI_NPEM
	bool "Native PCIe Enclosure Management"
	depends on LEDS_CLASS=y
	help
	  Support for Native PCIe Enclosure Management. It allows managing LED
	  indications in storage enclosures. Enclosure must support following
	  indications: OK, Locate, Fail, Rebuild, other indications are
	  optional.

config PCI_PRI
	bool "PCI PRI support"
	select PCI_ATS
	help
	  PRI is the PCI Page Request Interface. It allows PCI devices that are
	  behind an IOMMU to recover from page faults.

	  If unsure, say N.

config PCI_PASID
	bool "PCI PASID support"
	select PCI_ATS
	help
	  Process Address Space Identifiers (PASIDs) can be used by PCI devices
	  to access more than one IO address space at the same time. To make
	  use of this feature an IOMMU is required which also supports PASIDs.
	  Select this option if you have such an IOMMU and want to compile the
	  driver for it into your kernel.

	  If unsure, say N.

config PCI_P2PDMA
	bool "PCI peer-to-peer transfer support"
	depends on ZONE_DEVICE
	#
	# The need for the scatterlist DMA bus address flag means PCI P2PDMA
	# requires 64bit
	#
	depends on 64BIT
	select GENERIC_ALLOCATOR
	select NEED_SG_DMA_FLAGS
	help
	  Enables drivers to do PCI peer-to-peer transactions to and from
	  BARs that are exposed in other devices that are the part of
	  the hierarchy where peer-to-peer DMA is guaranteed by the PCI
	  specification to work (ie. anything below a single PCI bridge).

	  Many PCIe root complexes do not support P2P transactions and
	  it's hard to tell which support it at all, so at this time,
	  P2P DMA transactions must be between devices behind the same root
	  port.

	  If unsure, say N.

config PCI_LABEL
	def_bool y if (DMI || ACPI)
	select NLS

config PCI_HYPERV
	tristate "Hyper-V PCI Frontend"
	depends on ((X86 && X86_64) || ARM64) && HYPERV && PCI_MSI && SYSFS
	select PCI_HYPERV_INTERFACE
	help
	  The PCI device frontend driver allows the kernel to import arbitrary
	  PCI devices from a PCI backend to support PCI driver domains.

config PCI_DYNAMIC_OF_NODES
	bool "Create Device tree nodes for PCI devices"
	depends on OF_IRQ
	select OF_DYNAMIC
	help
	  This option enables support for generating device tree nodes for some
	  PCI devices. Thus, the driver of this kind can load and overlay
	  flattened device tree for its downstream devices.

	  Once this option is selected, the device tree nodes will be generated
	  for all PCI bridges.

choice
	prompt "PCI Express hierarchy optimization setting"
	default PCIE_BUS_DEFAULT
	depends on PCI && EXPERT
	help
	  MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
	  device parameters that affect performance and the ability to
	  support hotplug and peer-to-peer DMA.

	  The following choices set the MPS and MRRS optimization strategy
	  at compile-time.  The choices are the same as those offered for
	  the kernel command-line parameter 'pci', i.e.,
	  'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
	  'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.

	  This is a compile-time setting and can be overridden by the above
	  command-line parameters.  If unsure, choose PCIE_BUS_DEFAULT.

config PCIE_BUS_TUNE_OFF
	bool "Tune Off"
	depends on PCI
	help
	  Use the BIOS defaults; don't touch MPS at all.  This is the same
	  as booting with 'pci=pcie_bus_tune_off'.

config PCIE_BUS_DEFAULT
	bool "Default"
	depends on PCI
	help
	  Default choice; ensure that the MPS matches upstream bridge.

config PCIE_BUS_SAFE
	bool "Safe"
	depends on PCI
	help
	  Use largest MPS that boot-time devices support.  If you have a
	  closed system with no possibility of adding new devices, this
	  will use the largest MPS that's supported by all devices.  This
	  is the same as booting with 'pci=pcie_bus_safe'.

config PCIE_BUS_PERFORMANCE
	bool "Performance"
	depends on PCI
	help
	  Use MPS and MRRS for best performance.  Ensure that a given
	  device's MPS is no larger than its parent MPS, which allows us to
	  keep all switches/bridges to the max MPS supported by their
	  parent.  This is the same as booting with 'pci=pcie_bus_perf'.

config PCIE_BUS_PEER2PEER
	bool "Peer2peer"
	depends on PCI
	help
	  Set MPS = 128 for all devices.  MPS configuration effected by the
	  other options could cause the MPS on one root port to be
	  different than that of the MPS on another, which may cause
	  hot-added devices or peer-to-peer DMA to fail.  Set MPS to the
	  smallest possible value (128B) system-wide to avoid these issues.
	  This is the same as booting with 'pci=pcie_bus_peer2peer'.

endchoice

config VGA_ARB
	bool "VGA Arbitration" if EXPERT
	default y
	depends on (PCI && !S390)
	help
	  Some "legacy" VGA devices implemented on PCI typically have the same
	  hard-decoded addresses as they did on ISA. When multiple PCI devices
	  are accessed at same time they need some kind of coordination. Please
	  see Documentation/gpu/vgaarbiter.rst for more details. Select this to
	  enable VGA arbiter.

config VGA_ARB_MAX_GPUS
	int "Maximum number of GPUs"
	default 16
	depends on VGA_ARB
	help
	  Reserves space in the kernel to maintain resource locking for
	  multiple GPUS.  The overhead for each GPU is very small.

source "drivers/pci/hotplug/Kconfig"
source "drivers/pci/controller/Kconfig"
source "drivers/pci/endpoint/Kconfig"
source "drivers/pci/switch/Kconfig"
source "drivers/pci/pwrctl/Kconfig"

endif
Commit	Line	Data
	1	# SPDX-License-Identifier: GPL-2.0
	2	#
	3	# PCI configuration
	4	#
	5
	6	# select this to offer the PCI prompt
	7	config HAVE_PCI
	8	bool
	9
	10	# select this to unconditionally force on PCI support
	11	config FORCE_PCI
	12	bool
	13	select HAVE_PCI
	14	select PCI
	15
	16	# select this to provide a generic PCI iomap,
	17	# without PCI itself having to be defined
	18	config GENERIC_PCI_IOMAP
	19	bool
	20
	21	menuconfig PCI
	22	bool "PCI support"
	23	depends on HAVE_PCI
	24	help
	25	This option enables support for the PCI local bus, including
	26	support for PCI-X and the foundations for PCI Express support.
	27	Say 'Y' here unless you know what you are doing.
	28
	29	if PCI
	30
	31	config PCI_DOMAINS
	32	bool
	33	depends on PCI
	34
	35	config PCI_DOMAINS_GENERIC
	36	bool
	37	select PCI_DOMAINS
	38
	39	config PCI_SYSCALL
	40	bool
	41
	42	source "drivers/pci/pcie/Kconfig"
	43
	44	config PCI_MSI
	45	bool "Message Signaled Interrupts (MSI and MSI-X)"
	46	select GENERIC_MSI_IRQ
	47	help
	48	This allows device drivers to enable MSI (Message Signaled
	49	Interrupts). Message Signaled Interrupts enable a device to
	50	generate an interrupt using an inbound Memory Write on its
	51	PCI bus instead of asserting a device IRQ pin.
	52
	53	Use of PCI MSI interrupts can be disabled at kernel boot time
	54	by using the 'pci=nomsi' option. This disables MSI for the
	55	entire system.
	56
	57	If you don't know what to do here, say Y.
	58
	59	config PCI_MSI_ARCH_FALLBACKS
	60	bool
	61
	62	config PCI_QUIRKS
	63	default y
	64	bool "Enable PCI quirk workarounds" if EXPERT
	65	help
	66	This enables workarounds for various PCI chipset bugs/quirks.
	67	Disable this only if your target machine is unaffected by PCI
	68	quirks.
	69
	70	config PCI_DEBUG
	71	bool "PCI Debugging"
	72	depends on DEBUG_KERNEL
	73	help
	74	Say Y here if you want the PCI core to produce a bunch of debug
	75	messages to the system log. Select this if you are having a
	76	problem with PCI support and want to see more of what is going on.
	77
	78	When in doubt, say N.
	79
	80	config PCI_REALLOC_ENABLE_AUTO
	81	bool "Enable PCI resource re-allocation detection"
	82	depends on PCI_IOV
	83	help
	84	Say Y here if you want the PCI core to detect if PCI resource
	85	re-allocation needs to be enabled. You can always use pci=realloc=on
	86	or pci=realloc=off to override it. It will automatically
	87	re-allocate PCI resources if SR-IOV BARs have not been allocated by
	88	the BIOS.
	89
	90	When in doubt, say N.
	91
	92	config PCI_STUB
	93	tristate "PCI Stub driver"
	94	help
	95	Say Y or M here if you want be able to reserve a PCI device
	96	when it is going to be assigned to a guest operating system.
	97
	98	When in doubt, say N.
	99
	100	config PCI_PF_STUB
	101	tristate "PCI PF Stub driver"
	102	depends on PCI_IOV
	103	help
	104	Say Y or M here if you want to enable support for devices that
	105	require SR-IOV support, while at the same time the PF (Physical
	106	Function) itself is not providing any actual services on the
	107	host itself such as storage or networking.
	108
	109	When in doubt, say N.
	110
	111	config XEN_PCIDEV_FRONTEND
	112	tristate "Xen PCI Frontend"
	113	depends on XEN_PV
	114	select PCI_XEN
	115	select XEN_XENBUS_FRONTEND
	116	default y
	117	help
	118	The PCI device frontend driver allows the kernel to import arbitrary
	119	PCI devices from a PCI backend to support PCI driver domains.
	120
	121	config PCI_ATS
	122	bool
	123
	124	config PCI_DOE
	125	bool
	126
	127	config PCI_ECAM
	128	bool
	129
	130	config PCI_LOCKLESS_CONFIG
	131	bool
	132
	133	config PCI_BRIDGE_EMUL
	134	bool
	135
	136	config PCI_IOV
	137	bool "PCI IOV support"
	138	select PCI_ATS
	139	help
	140	I/O Virtualization is a PCI feature supported by some devices
	141	which allows them to create virtual devices which share their
	142	physical resources.
	143
	144	If unsure, say N.
	145
	146	config PCI_NPEM
	147	bool "Native PCIe Enclosure Management"
	148	depends on LEDS_CLASS=y
	149	help
	150	Support for Native PCIe Enclosure Management. It allows managing LED
	151	indications in storage enclosures. Enclosure must support following
	152	indications: OK, Locate, Fail, Rebuild, other indications are
	153	optional.
	154
	155	config PCI_PRI
	156	bool "PCI PRI support"
	157	select PCI_ATS
	158	help
	159	PRI is the PCI Page Request Interface. It allows PCI devices that are
	160	behind an IOMMU to recover from page faults.
	161
	162	If unsure, say N.
	163
	164	config PCI_PASID
	165	bool "PCI PASID support"
	166	select PCI_ATS
	167	help
	168	Process Address Space Identifiers (PASIDs) can be used by PCI devices
	169	to access more than one IO address space at the same time. To make
	170	use of this feature an IOMMU is required which also supports PASIDs.
	171	Select this option if you have such an IOMMU and want to compile the
	172	driver for it into your kernel.
	173
	174	If unsure, say N.
	175
	176	config PCI_P2PDMA
	177	bool "PCI peer-to-peer transfer support"
	178	depends on ZONE_DEVICE
	179	#
	180	# The need for the scatterlist DMA bus address flag means PCI P2PDMA
	181	# requires 64bit
	182	#
	183	depends on 64BIT
	184	select GENERIC_ALLOCATOR
	185	select NEED_SG_DMA_FLAGS
	186	help
	187	Enables drivers to do PCI peer-to-peer transactions to and from
	188	BARs that are exposed in other devices that are the part of
	189	the hierarchy where peer-to-peer DMA is guaranteed by the PCI
	190	specification to work (ie. anything below a single PCI bridge).
	191
	192	Many PCIe root complexes do not support P2P transactions and
	193	it's hard to tell which support it at all, so at this time,
	194	P2P DMA transactions must be between devices behind the same root
	195	port.
	196
	197	If unsure, say N.
	198
	199	config PCI_LABEL
	200	def_bool y if (DMI \|\| ACPI)
	201	select NLS
	202
	203	config PCI_HYPERV
	204	tristate "Hyper-V PCI Frontend"
	205	depends on ((X86 && X86_64) \|\| ARM64) && HYPERV && PCI_MSI && SYSFS
	206	select PCI_HYPERV_INTERFACE
	207	help
	208	The PCI device frontend driver allows the kernel to import arbitrary
	209	PCI devices from a PCI backend to support PCI driver domains.
	210
	211	config PCI_DYNAMIC_OF_NODES
	212	bool "Create Device tree nodes for PCI devices"
	213	depends on OF_IRQ
	214	select OF_DYNAMIC
	215	help
	216	This option enables support for generating device tree nodes for some
	217	PCI devices. Thus, the driver of this kind can load and overlay
	218	flattened device tree for its downstream devices.
	219
	220	Once this option is selected, the device tree nodes will be generated
	221	for all PCI bridges.
	222
	223	choice
	224	prompt "PCI Express hierarchy optimization setting"
	225	default PCIE_BUS_DEFAULT
	226	depends on PCI && EXPERT
	227	help
	228	MPS (Max Payload Size) and MRRS (Max Read Request Size) are PCIe
	229	device parameters that affect performance and the ability to
	230	support hotplug and peer-to-peer DMA.
	231
	232	The following choices set the MPS and MRRS optimization strategy
	233	at compile-time. The choices are the same as those offered for
	234	the kernel command-line parameter 'pci', i.e.,
	235	'pci=pcie_bus_tune_off', 'pci=pcie_bus_safe',
	236	'pci=pcie_bus_perf', and 'pci=pcie_bus_peer2peer'.
	237
	238	This is a compile-time setting and can be overridden by the above
	239	command-line parameters. If unsure, choose PCIE_BUS_DEFAULT.
	240
	241	config PCIE_BUS_TUNE_OFF
	242	bool "Tune Off"
	243	depends on PCI
	244	help
	245	Use the BIOS defaults; don't touch MPS at all. This is the same
	246	as booting with 'pci=pcie_bus_tune_off'.
	247
	248	config PCIE_BUS_DEFAULT
	249	bool "Default"
	250	depends on PCI
	251	help
	252	Default choice; ensure that the MPS matches upstream bridge.
	253
	254	config PCIE_BUS_SAFE
	255	bool "Safe"
	256	depends on PCI
	257	help
	258	Use largest MPS that boot-time devices support. If you have a
	259	closed system with no possibility of adding new devices, this
	260	will use the largest MPS that's supported by all devices. This
	261	is the same as booting with 'pci=pcie_bus_safe'.
	262
	263	config PCIE_BUS_PERFORMANCE
	264	bool "Performance"
	265	depends on PCI
	266	help
	267	Use MPS and MRRS for best performance. Ensure that a given
	268	device's MPS is no larger than its parent MPS, which allows us to
	269	keep all switches/bridges to the max MPS supported by their
	270	parent. This is the same as booting with 'pci=pcie_bus_perf'.
	271
	272	config PCIE_BUS_PEER2PEER
	273	bool "Peer2peer"
	274	depends on PCI
	275	help
	276	Set MPS = 128 for all devices. MPS configuration effected by the
	277	other options could cause the MPS on one root port to be
	278	different than that of the MPS on another, which may cause
	279	hot-added devices or peer-to-peer DMA to fail. Set MPS to the
	280	smallest possible value (128B) system-wide to avoid these issues.
	281	This is the same as booting with 'pci=pcie_bus_peer2peer'.
	282
	283	endchoice
	284
	285	config VGA_ARB
	286	bool "VGA Arbitration" if EXPERT
	287	default y
	288	depends on (PCI && !S390)
	289	help
	290	Some "legacy" VGA devices implemented on PCI typically have the same
	291	hard-decoded addresses as they did on ISA. When multiple PCI devices
	292	are accessed at same time they need some kind of coordination. Please
	293	see Documentation/gpu/vgaarbiter.rst for more details. Select this to
	294	enable VGA arbiter.
	295
	296	config VGA_ARB_MAX_GPUS
	297	int "Maximum number of GPUs"
	298	default 16
	299	depends on VGA_ARB
	300	help
	301	Reserves space in the kernel to maintain resource locking for
	302	multiple GPUS. The overhead for each GPU is very small.
	303
	304	source "drivers/pci/hotplug/Kconfig"
	305	source "drivers/pci/controller/Kconfig"
	306	source "drivers/pci/endpoint/Kconfig"
	307	source "drivers/pci/switch/Kconfig"
	308	source "drivers/pci/pwrctl/Kconfig"
	309
	310	endif