xref: /openbmc/linux/drivers/pci/Kconfig (revision 63dc02bd) 
1#
2# PCI configuration
3#
4config ARCH_SUPPORTS_MSI
5	bool
6	default n
7
8config PCI_MSI
9	bool "Message Signaled Interrupts (MSI and MSI-X)"
10	depends on PCI
11	depends on ARCH_SUPPORTS_MSI
12	help
13	   This allows device drivers to enable MSI (Message Signaled
14	   Interrupts).  Message Signaled Interrupts enable a device to
15	   generate an interrupt using an inbound Memory Write on its
16	   PCI bus instead of asserting a device IRQ pin.
17
18	   Use of PCI MSI interrupts can be disabled at kernel boot time
19	   by using the 'pci=nomsi' option.  This disables MSI for the
20	   entire system.
21
22	   If you don't know what to do here, say Y.
23
24config PCI_DEBUG
25	bool "PCI Debugging"
26	depends on PCI && DEBUG_KERNEL
27	help
28	  Say Y here if you want the PCI core to produce a bunch of debug
29	  messages to the system log.  Select this if you are having a
30	  problem with PCI support and want to see more of what is going on.
31
32	  When in doubt, say N.
33
34config PCI_REALLOC_ENABLE_AUTO
35	bool "Enable PCI resource re-allocation detection"
36	depends on PCI
37	help
38	  Say Y here if you want the PCI core to detect if PCI resource
39	  re-allocation needs to be enabled. You can always use pci=realloc=on
40          or pci=realloc=off to override it.  Note this feature is a no-op
41          unless PCI_IOV support is also enabled; in that case it will
42          automatically re-allocate PCI resources if SR-IOV BARs have not
43          been allocated by the BIOS.
44
45	  When in doubt, say N.
46
47config PCI_STUB
48	tristate "PCI Stub driver"
49	depends on PCI
50	help
51	  Say Y or M here if you want be able to reserve a PCI device
52	  when it is going to be assigned to a guest operating system.
53
54	  When in doubt, say N.
55
56config XEN_PCIDEV_FRONTEND
57        tristate "Xen PCI Frontend"
58        depends on PCI && X86 && XEN
59        select HOTPLUG
60        select PCI_XEN
61	select XEN_XENBUS_FRONTEND
62        default y
63        help
64          The PCI device frontend driver allows the kernel to import arbitrary
65          PCI devices from a PCI backend to support PCI driver domains.
66
67config HT_IRQ
68	bool "Interrupts on hypertransport devices"
69	default y
70	depends on PCI && X86_LOCAL_APIC && X86_IO_APIC
71	help
72	   This allows native hypertransport devices to use interrupts.
73
74	   If unsure say Y.
75
76config PCI_ATS
77	bool
78
79config PCI_IOV
80	bool "PCI IOV support"
81	depends on PCI
82	select PCI_ATS
83	help
84	  I/O Virtualization is a PCI feature supported by some devices
85	  which allows them to create virtual devices which share their
86	  physical resources.
87
88	  If unsure, say N.
89
90config PCI_PRI
91	bool "PCI PRI support"
92	depends on PCI
93	select PCI_ATS
94	help
95	  PRI is the PCI Page Request Interface. It allows PCI devices that are
96	  behind an IOMMU to recover from page faults.
97
98	  If unsure, say N.
99
100config PCI_PASID
101	bool "PCI PASID support"
102	depends on PCI
103	select PCI_ATS
104	help
105	  Process Address Space Identifiers (PASIDs) can be used by PCI devices
106	  to access more than one IO address space at the same time. To make
107	  use of this feature an IOMMU is required which also supports PASIDs.
108	  Select this option if you have such an IOMMU and want to compile the
109	  driver for it into your kernel.
110
111	  If unsure, say N.
112
113config PCI_IOAPIC
114	tristate "PCI IO-APIC hotplug support" if X86
115	depends on PCI
116	depends on ACPI
117	depends on HOTPLUG
118	default !X86
119
120config PCI_LABEL
121	def_bool y if (DMI || ACPI)
122	select NLS
123