xref: /openbmc/linux/drivers/pci/Kconfig (revision a44e4f3a) 
1# SPDX-License-Identifier: GPL-2.0
2#
3# PCI configuration
4#
5
6# select this to offer the PCI prompt
7config HAVE_PCI
8	bool
9
10# select this to unconditionally force on PCI support
11config FORCE_PCI
12	bool
13	select HAVE_PCI
14	select PCI
15
16menuconfig 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
24if PCI
25
26config PCI_DOMAINS
27	bool
28	depends on PCI
29
30config PCI_DOMAINS_GENERIC
31	bool
32	select PCI_DOMAINS
33
34config PCI_SYSCALL
35	bool
36
37source "drivers/pci/pcie/Kconfig"
38
39config PCI_MSI
40	bool "Message Signaled Interrupts (MSI and MSI-X)"
41	select GENERIC_MSI_IRQ
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
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
52	   If you don't know what to do here, say Y.
53
54config PCI_MSI_IRQ_DOMAIN
55	def_bool ARC || ARM || ARM64 || X86 || RISCV
56	depends on PCI_MSI
57	select GENERIC_MSI_IRQ_DOMAIN
58
59config PCI_QUIRKS
60	default y
61	bool "Enable PCI quirk workarounds" if EXPERT
62	help
63	  This enables workarounds for various PCI chipset bugs/quirks.
64	  Disable this only if your target machine is unaffected by PCI
65	  quirks.
66
67config PCI_DEBUG
68	bool "PCI Debugging"
69	depends on DEBUG_KERNEL
70	help
71	  Say Y here if you want the PCI core to produce a bunch of debug
72	  messages to the system log.  Select this if you are having a
73	  problem with PCI support and want to see more of what is going on.
74
75	  When in doubt, say N.
76
77config PCI_REALLOC_ENABLE_AUTO
78	bool "Enable PCI resource re-allocation detection"
79	depends on PCI_IOV
80	help
81	  Say Y here if you want the PCI core to detect if PCI resource
82	  re-allocation needs to be enabled. You can always use pci=realloc=on
83	  or pci=realloc=off to override it.  It will automatically
84	  re-allocate PCI resources if SR-IOV BARs have not been allocated by
85	  the BIOS.
86
87	  When in doubt, say N.
88
89config PCI_STUB
90	tristate "PCI Stub driver"
91	help
92	  Say Y or M here if you want be able to reserve a PCI device
93	  when it is going to be assigned to a guest operating system.
94
95	  When in doubt, say N.
96
97config PCI_PF_STUB
98	tristate "PCI PF Stub driver"
99	depends on PCI_IOV
100	help
101	  Say Y or M here if you want to enable support for devices that
102	  require SR-IOV support, while at the same time the PF (Physical
103	  Function) itself is not providing any actual services on the
104	  host itself such as storage or networking.
105
106	  When in doubt, say N.
107
108config XEN_PCIDEV_FRONTEND
109        tristate "Xen PCI Frontend"
110        depends on X86 && XEN
111        select PCI_XEN
112	select XEN_XENBUS_FRONTEND
113        default y
114        help
115          The PCI device frontend driver allows the kernel to import arbitrary
116          PCI devices from a PCI backend to support PCI driver domains.
117
118config PCI_ATS
119	bool
120
121config PCI_ECAM
122	bool
123
124config PCI_LOCKLESS_CONFIG
125	bool
126
127config PCI_BRIDGE_EMUL
128	bool
129
130config PCI_IOV
131	bool "PCI IOV support"
132	select PCI_ATS
133	help
134	  I/O Virtualization is a PCI feature supported by some devices
135	  which allows them to create virtual devices which share their
136	  physical resources.
137
138	  If unsure, say N.
139
140config PCI_PRI
141	bool "PCI PRI support"
142	select PCI_ATS
143	help
144	  PRI is the PCI Page Request Interface. It allows PCI devices that are
145	  behind an IOMMU to recover from page faults.
146
147	  If unsure, say N.
148
149config PCI_PASID
150	bool "PCI PASID support"
151	select PCI_ATS
152	help
153	  Process Address Space Identifiers (PASIDs) can be used by PCI devices
154	  to access more than one IO address space at the same time. To make
155	  use of this feature an IOMMU is required which also supports PASIDs.
156	  Select this option if you have such an IOMMU and want to compile the
157	  driver for it into your kernel.
158
159	  If unsure, say N.
160
161config PCI_P2PDMA
162	bool "PCI peer-to-peer transfer support"
163	depends on ZONE_DEVICE
164	select GENERIC_ALLOCATOR
165	help
166	  Enableѕ drivers to do PCI peer-to-peer transactions to and from
167	  BARs that are exposed in other devices that are the part of
168	  the hierarchy where peer-to-peer DMA is guaranteed by the PCI
169	  specification to work (ie. anything below a single PCI bridge).
170
171	  Many PCIe root complexes do not support P2P transactions and
172	  it's hard to tell which support it at all, so at this time,
173	  P2P DMA transactions must be between devices behind the same root
174	  port.
175
176	  If unsure, say N.
177
178config PCI_LABEL
179	def_bool y if (DMI || ACPI)
180	select NLS
181
182config PCI_HYPERV
183        tristate "Hyper-V PCI Frontend"
184        depends on X86_64 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && SYSFS
185	select PCI_HYPERV_INTERFACE
186        help
187          The PCI device frontend driver allows the kernel to import arbitrary
188          PCI devices from a PCI backend to support PCI driver domains.
189
190source "drivers/pci/hotplug/Kconfig"
191source "drivers/pci/controller/Kconfig"
192source "drivers/pci/endpoint/Kconfig"
193source "drivers/pci/switch/Kconfig"
194
195endif
196