[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

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.

config PCI_DOMAINS
	bool
	depends on PCI

config PCI_DOMAINS_GENERIC
	bool
	depends on PCI
	select PCI_DOMAINS

config PCI_SYSCALL
	bool

source "drivers/pci/pcie/Kconfig"

config PCI_MSI
	bool "Message Signaled Interrupts (MSI and MSI-X)"
	depends on PCI
	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_IRQ_DOMAIN
	def_bool ARC || ARM || ARM64 || X86
	depends on PCI_MSI
	select GENERIC_MSI_IRQ_DOMAIN

config PCI_QUIRKS
	default y
	bool "Enable PCI quirk workarounds" if EXPERT
	depends on PCI
	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 PCI && 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
	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"
	depends on PCI
	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
	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 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 PCI && X86 && XEN
        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_ECAM
	bool

config PCI_LOCKLESS_CONFIG
	bool

config PCI_BRIDGE_EMUL
	bool

config PCI_IOV
	bool "PCI IOV support"
	depends on PCI
	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_PRI
	bool "PCI PRI support"
	depends on PCI
	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"
	depends on PCI
	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 PCI && ZONE_DEVICE
	select GENERIC_ALLOCATOR
	help
	  Enableѕ 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 transations must be between devices behind the same root
	  port.

	  If unsure, say N.

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

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

source "drivers/pci/hotplug/Kconfig"
source "drivers/pci/controller/Kconfig"
source "drivers/pci/endpoint/Kconfig"
source "drivers/pci/switch/Kconfig"
Commit	Line	Data
7328c8f4	1	# SPDX-License-Identifier: GPL-2.0
1da177e4 LT	2	#
	3	# PCI configuration
	4	#
5f8fc432	5
eb01d42a CH	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	menuconfig PCI
	17	bool "PCI support"
	18	depends on HAVE_PCI
	19	help
	20	This option enables support for the PCI local bus, including
	21	support for PCI-X and the foundations for PCI Express support.
	22	Say 'Y' here unless you know what you are doing.
	23
2eac9c2d CH	24	config PCI_DOMAINS
	25	bool
	26	depends on PCI
	27
	28	config PCI_DOMAINS_GENERIC
	29	bool
	30	depends on PCI
	31	select PCI_DOMAINS
	32
20f1b79d CH	33	config PCI_SYSCALL
	34	bool
	35
5f8fc432 BS	36	source "drivers/pci/pcie/Kconfig"
5f8fc432 BS	37
1da177e4 LT	38	config PCI_MSI
	39	bool "Message Signaled Interrupts (MSI and MSI-X)"
	40	depends on PCI
38b6a1cf	41	select GENERIC_MSI_IRQ
1da177e4 LT	42	help
	43	This allows device drivers to enable MSI (Message Signaled
	44	Interrupts). Message Signaled Interrupts enable a device to
	45	generate an interrupt using an inbound Memory Write on its
	46	PCI bus instead of asserting a device IRQ pin.
	47
309e57df MW	48	Use of PCI MSI interrupts can be disabled at kernel boot time
	49	by using the 'pci=nomsi' option. This disables MSI for the
	50	entire system.
	51
3196180a	52	If you don't know what to do here, say Y.
1da177e4	53
3878eaef	54	config PCI_MSI_IRQ_DOMAIN
f8430eae	55	def_bool ARC \|\| ARM \|\| ARM64 \|\| X86
3878eaef JL	56	depends on PCI_MSI
	57	select GENERIC_MSI_IRQ_DOMAIN
	58
03ea2263 RD	59	config PCI_QUIRKS
	60	default y
	61	bool "Enable PCI quirk workarounds" if EXPERT
	62	depends on PCI
	63	help
	64	This enables workarounds for various PCI chipset bugs/quirks.
	65	Disable this only if your target machine is unaffected by PCI
	66	quirks.
	67
1da177e4 LT	68	config PCI_DEBUG
	69	bool "PCI Debugging"
	70	depends on PCI && DEBUG_KERNEL
	71	help
	72	Say Y here if you want the PCI core to produce a bunch of debug
	73	messages to the system log. Select this if you are having a
	74	problem with PCI support and want to see more of what is going on.
	75
	76	When in doubt, say N.
	77
b07f2ebc YL	78	config PCI_REALLOC_ENABLE_AUTO
	79	bool "Enable PCI resource re-allocation detection"
	80	depends on PCI
ad581f86	81	depends on PCI_IOV
b07f2ebc YL	82	help
	83	Say Y here if you want the PCI core to detect if PCI resource
	84	re-allocation needs to be enabled. You can always use pci=realloc=on
ad581f86 SES	85	or pci=realloc=off to override it. It will automatically
	86	re-allocate PCI resources if SR-IOV BARs have not been allocated by
	87	the BIOS.
b07f2ebc YL	88
	89	When in doubt, say N.
	90
c70e0d9d CW	91	config PCI_STUB
	92	tristate "PCI Stub driver"
	93	depends on PCI
	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
a8ccf8a6 AD	100	config PCI_PF_STUB
	101	tristate "PCI PF Stub driver"
	102	depends on PCI
	103	depends on PCI_IOV
	104	help
	105	Say Y or M here if you want to enable support for devices that
	106	require SR-IOV support, while at the same time the PF itself is
	107	not providing any actual services on the host itself such as
	108	storage or networking.
	109
	110	When in doubt, say N.
	111
956a9202 RW	112	config XEN_PCIDEV_FRONTEND
	113	tristate "Xen PCI Frontend"
	114	depends on PCI && X86 && XEN
956a9202	115	select PCI_XEN
fce263c1	116	select XEN_XENBUS_FRONTEND
956a9202 RW	117	default y
	118	help
	119	The PCI device frontend driver allows the kernel to import arbitrary
	120	PCI devices from a PCI backend to support PCI driver domains.
	121
db3c33c6 JR	122	config PCI_ATS
	123	bool
	124
35ff9477 J	125	config PCI_ECAM
	126	bool
	127
714fe383 TG	128	config PCI_LOCKLESS_CONFIG
	129	bool
	130
23a5fba4 TP	131	config PCI_BRIDGE_EMUL
23a5fba4 TP	132	bool
714fe383	133
d1b054da YZ	134	config PCI_IOV
	135	bool "PCI IOV support"
	136	depends on PCI
db3c33c6	137	select PCI_ATS
d1b054da YZ	138	help
	139	I/O Virtualization is a PCI feature supported by some devices
	140	which allows them to create virtual devices which share their
	141	physical resources.
	142
	143	If unsure, say N.
204d49a5	144
c320b976 JR	145	config PCI_PRI
c320b976 JR	146	bool "PCI PRI support"
c54420d3	147	depends on PCI
c320b976 JR	148	select PCI_ATS
	149	help
	150	PRI is the PCI Page Request Interface. It allows PCI devices that are
	151	behind an IOMMU to recover from page faults.
	152
	153	If unsure, say N.
	154
086ac11f JR	155	config PCI_PASID
	156	bool "PCI PASID support"
	157	depends on PCI
	158	select PCI_ATS
	159	help
	160	Process Address Space Identifiers (PASIDs) can be used by PCI devices
	161	to access more than one IO address space at the same time. To make
	162	use of this feature an IOMMU is required which also supports PASIDs.
	163	Select this option if you have such an IOMMU and want to compile the
	164	driver for it into your kernel.
	165
	166	If unsure, say N.
	167
52916982 LG	168	config PCI_P2PDMA
	169	bool "PCI peer-to-peer transfer support"
	170	depends on PCI && ZONE_DEVICE
	171	select GENERIC_ALLOCATOR
	172	help
	173	Enableѕ drivers to do PCI peer-to-peer transactions to and from
	174	BARs that are exposed in other devices that are the part of
	175	the hierarchy where peer-to-peer DMA is guaranteed by the PCI
	176	specification to work (ie. anything below a single PCI bridge).
	177
	178	Many PCIe root complexes do not support P2P transactions and
	179	it's hard to tell which support it at all, so at this time,
	180	P2P DMA transations must be between devices behind the same root
	181	port.
	182
	183	If unsure, say N.
	184
8a226e00 RD	185	config PCI_LABEL
8a226e00 RD	186	def_bool y if (DMI \|\| ACPI)
9de0eec2	187	depends on PCI
8a226e00	188	select NLS
45361a4f	189
4daace0d JO	190	config PCI_HYPERV
	191	tristate "Hyper-V PCI Frontend"
	192	depends on PCI && X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
	193	help
	194	The PCI device frontend driver allows the kernel to import arbitrary
	195	PCI devices from a PCI backend to support PCI driver domains.
	196
30b5b880	197	source "drivers/pci/hotplug/Kconfig"
6e0832fa	198	source "drivers/pci/controller/Kconfig"
5e8cb403	199	source "drivers/pci/endpoint/Kconfig"
080b47de	200	source "drivers/pci/switch/Kconfig"