1 # SPDX-License-Identifier: GPL-2.0
6 # select this to offer the PCI prompt
10 # select this to unconditionally force on PCI support
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.
28 config PCI_DOMAINS_GENERIC
36 source "drivers/pci/pcie/Kconfig"
39 bool "Message Signaled Interrupts (MSI and MSI-X)"
41 select GENERIC_MSI_IRQ
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.
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
52 If you don't know what to do here, say Y.
54 config PCI_MSI_IRQ_DOMAIN
55 def_bool ARC || ARM || ARM64 || X86
57 select GENERIC_MSI_IRQ_DOMAIN
61 bool "Enable PCI quirk workarounds" if EXPERT
64 This enables workarounds for various PCI chipset bugs/quirks.
65 Disable this only if your target machine is unaffected by PCI
70 depends on PCI && DEBUG_KERNEL
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.
78 config PCI_REALLOC_ENABLE_AUTO
79 bool "Enable PCI resource re-allocation detection"
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
92 tristate "PCI Stub driver"
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.
101 tristate "PCI PF Stub driver"
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.
110 When in doubt, say N.
112 config XEN_PCIDEV_FRONTEND
113 tristate "Xen PCI Frontend"
114 depends on PCI && X86 && XEN
116 select XEN_XENBUS_FRONTEND
119 The PCI device frontend driver allows the kernel to import arbitrary
120 PCI devices from a PCI backend to support PCI driver domains.
128 config PCI_LOCKLESS_CONFIG
131 config PCI_BRIDGE_EMUL
135 bool "PCI IOV support"
139 I/O Virtualization is a PCI feature supported by some devices
140 which allows them to create virtual devices which share their
146 bool "PCI PRI support"
150 PRI is the PCI Page Request Interface. It allows PCI devices that are
151 behind an IOMMU to recover from page faults.
156 bool "PCI PASID support"
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.
169 bool "PCI peer-to-peer transfer support"
170 depends on PCI && ZONE_DEVICE
171 select GENERIC_ALLOCATOR
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).
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
186 def_bool y if (DMI || ACPI)
191 tristate "Hyper-V PCI Frontend"
192 depends on PCI && X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
194 The PCI device frontend driver allows the kernel to import arbitrary
195 PCI devices from a PCI backend to support PCI driver domains.
197 source "drivers/pci/hotplug/Kconfig"
198 source "drivers/pci/controller/Kconfig"
199 source "drivers/pci/endpoint/Kconfig"
200 source "drivers/pci/switch/Kconfig"