xref: /openbmc/linux/drivers/pci/Kconfig (revision 93d90ad7) 
1#
2# PCI configuration
3#
4config PCI_MSI
5	bool "Message Signaled Interrupts (MSI and MSI-X)"
6	depends on PCI
7	select GENERIC_MSI_IRQ
8	help
9	   This allows device drivers to enable MSI (Message Signaled
10	   Interrupts).  Message Signaled Interrupts enable a device to
11	   generate an interrupt using an inbound Memory Write on its
12	   PCI bus instead of asserting a device IRQ pin.
13
14	   Use of PCI MSI interrupts can be disabled at kernel boot time
15	   by using the 'pci=nomsi' option.  This disables MSI for the
16	   entire system.
17
18	   If you don't know what to do here, say Y.
19
20config PCI_MSI_IRQ_DOMAIN
21	bool
22	depends on PCI_MSI
23	select GENERIC_MSI_IRQ_DOMAIN
24
25config PCI_DEBUG
26	bool "PCI Debugging"
27	depends on PCI && DEBUG_KERNEL
28	help
29	  Say Y here if you want the PCI core to produce a bunch of debug
30	  messages to the system log.  Select this if you are having a
31	  problem with PCI support and want to see more of what is going on.
32
33	  When in doubt, say N.
34
35config PCI_REALLOC_ENABLE_AUTO
36	bool "Enable PCI resource re-allocation detection"
37	depends on PCI
38	help
39	  Say Y here if you want the PCI core to detect if PCI resource
40	  re-allocation needs to be enabled. You can always use pci=realloc=on
41          or pci=realloc=off to override it.  Note this feature is a no-op
42          unless PCI_IOV support is also enabled; in that case it will
43          automatically re-allocate PCI resources if SR-IOV BARs have not
44          been allocated by the BIOS.
45
46	  When in doubt, say N.
47
48config PCI_STUB
49	tristate "PCI Stub driver"
50	depends on PCI
51	help
52	  Say Y or M here if you want be able to reserve a PCI device
53	  when it is going to be assigned to a guest operating system.
54
55	  When in doubt, say N.
56
57config XEN_PCIDEV_FRONTEND
58        tristate "Xen PCI Frontend"
59        depends on PCI && X86 && XEN
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
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_LABEL
114	def_bool y if (DMI || ACPI)
115	select NLS
116
117source "drivers/pci/host/Kconfig"
118