xref: /openbmc/linux/drivers/pci/Kconfig (revision 5a170e9e) 
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
24config PCI_DOMAINS
25	bool
26	depends on PCI
27
28config PCI_DOMAINS_GENERIC
29	bool
30	depends on PCI
31	select PCI_DOMAINS
32
33config PCI_SYSCALL
34	bool
35
36source "drivers/pci/pcie/Kconfig"
37
38config PCI_MSI
39	bool "Message Signaled Interrupts (MSI and MSI-X)"
40	depends on PCI
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
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	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
68config 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
78config PCI_REALLOC_ENABLE_AUTO
79	bool "Enable PCI resource re-allocation detection"
80	depends on PCI
81	depends on PCI_IOV
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
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.
88
89	  When in doubt, say N.
90
91config 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
100config 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 (Physical
107	  Function) itself is not providing any actual services on the
108	  host itself such as storage or networking.
109
110	  When in doubt, say N.
111
112config XEN_PCIDEV_FRONTEND
113        tristate "Xen PCI Frontend"
114        depends on PCI && X86 && XEN
115        select PCI_XEN
116	select XEN_XENBUS_FRONTEND
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
122config PCI_ATS
123	bool
124
125config PCI_ECAM
126	bool
127
128config PCI_LOCKLESS_CONFIG
129	bool
130
131config PCI_BRIDGE_EMUL
132	bool
133
134config PCI_IOV
135	bool "PCI IOV support"
136	depends on PCI
137	select PCI_ATS
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.
144
145config PCI_PRI
146	bool "PCI PRI support"
147	depends on PCI
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
155config 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
168config 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
185config PCI_LABEL
186	def_bool y if (DMI || ACPI)
187	depends on PCI
188	select NLS
189
190config 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
197source "drivers/pci/hotplug/Kconfig"
198source "drivers/pci/controller/Kconfig"
199source "drivers/pci/endpoint/Kconfig"
200source "drivers/pci/switch/Kconfig"
201