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.
30 config PCI_DOMAINS_GENERIC
37 source "drivers/pci/pcie/Kconfig"
40 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
57 select GENERIC_MSI_IRQ_DOMAIN
59 config PCI_MSI_ARCH_FALLBACKS
64 bool "Enable PCI quirk workarounds" if EXPERT
66 This enables workarounds for various PCI chipset bugs/quirks.
67 Disable this only if your target machine is unaffected by PCI
72 depends on DEBUG_KERNEL
74 Say Y here if you want the PCI core to produce a bunch of debug
75 messages to the system log. Select this if you are having a
76 problem with PCI support and want to see more of what is going on.
80 config PCI_REALLOC_ENABLE_AUTO
81 bool "Enable PCI resource re-allocation detection"
84 Say Y here if you want the PCI core to detect if PCI resource
85 re-allocation needs to be enabled. You can always use pci=realloc=on
86 or pci=realloc=off to override it. It will automatically
87 re-allocate PCI resources if SR-IOV BARs have not been allocated by
93 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"
104 Say Y or M here if you want to enable support for devices that
105 require SR-IOV support, while at the same time the PF (Physical
106 Function) itself is not providing any actual services on the
107 host itself such as storage or networking.
109 When in doubt, say N.
111 config XEN_PCIDEV_FRONTEND
112 tristate "Xen PCI Frontend"
113 depends on X86 && XEN
115 select XEN_XENBUS_FRONTEND
118 The PCI device frontend driver allows the kernel to import arbitrary
119 PCI devices from a PCI backend to support PCI driver domains.
127 config PCI_LOCKLESS_CONFIG
130 config PCI_BRIDGE_EMUL
134 bool "PCI IOV support"
137 I/O Virtualization is a PCI feature supported by some devices
138 which allows them to create virtual devices which share their
144 bool "PCI PRI support"
147 PRI is the PCI Page Request Interface. It allows PCI devices that are
148 behind an IOMMU to recover from page faults.
153 bool "PCI PASID support"
156 Process Address Space Identifiers (PASIDs) can be used by PCI devices
157 to access more than one IO address space at the same time. To make
158 use of this feature an IOMMU is required which also supports PASIDs.
159 Select this option if you have such an IOMMU and want to compile the
160 driver for it into your kernel.
165 bool "PCI peer-to-peer transfer support"
166 depends on ZONE_DEVICE
167 select GENERIC_ALLOCATOR
169 Enableѕ drivers to do PCI peer-to-peer transactions to and from
170 BARs that are exposed in other devices that are the part of
171 the hierarchy where peer-to-peer DMA is guaranteed by the PCI
172 specification to work (ie. anything below a single PCI bridge).
174 Many PCIe root complexes do not support P2P transactions and
175 it's hard to tell which support it at all, so at this time,
176 P2P DMA transactions must be between devices behind the same root
182 def_bool y if (DMI || ACPI)
186 tristate "Hyper-V PCI Frontend"
187 depends on X86_64 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && SYSFS
188 select PCI_HYPERV_INTERFACE
190 The PCI device frontend driver allows the kernel to import arbitrary
191 PCI devices from a PCI backend to support PCI driver domains.
193 source "drivers/pci/hotplug/Kconfig"
194 source "drivers/pci/controller/Kconfig"
195 source "drivers/pci/endpoint/Kconfig"
196 source "drivers/pci/switch/Kconfig"