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
55 def_bool ARC || ARM || ARM64 || X86
57 select GENERIC_MSI_IRQ_DOMAIN
61 bool "Enable PCI quirk workarounds" if EXPERT
63 This enables workarounds for various PCI chipset bugs/quirks.
64 Disable this only if your target machine is unaffected by PCI
69 depends on DEBUG_KERNEL
71 Say Y here if you want the PCI core to produce a bunch of debug
72 messages to the system log. Select this if you are having a
73 problem with PCI support and want to see more of what is going on.
77 config PCI_REALLOC_ENABLE_AUTO
78 bool "Enable PCI resource re-allocation detection"
81 Say Y here if you want the PCI core to detect if PCI resource
82 re-allocation needs to be enabled. You can always use pci=realloc=on
83 or pci=realloc=off to override it. It will automatically
84 re-allocate PCI resources if SR-IOV BARs have not been allocated by
90 tristate "PCI Stub driver"
92 Say Y or M here if you want be able to reserve a PCI device
93 when it is going to be assigned to a guest operating system.
98 tristate "PCI PF Stub driver"
101 Say Y or M here if you want to enable support for devices that
102 require SR-IOV support, while at the same time the PF (Physical
103 Function) itself is not providing any actual services on the
104 host itself such as storage or networking.
106 When in doubt, say N.
108 config XEN_PCIDEV_FRONTEND
109 tristate "Xen PCI Frontend"
110 depends on X86 && XEN
112 select XEN_XENBUS_FRONTEND
115 The PCI device frontend driver allows the kernel to import arbitrary
116 PCI devices from a PCI backend to support PCI driver domains.
124 config PCI_LOCKLESS_CONFIG
127 config PCI_BRIDGE_EMUL
131 bool "PCI IOV support"
134 I/O Virtualization is a PCI feature supported by some devices
135 which allows them to create virtual devices which share their
141 bool "PCI PRI support"
144 PRI is the PCI Page Request Interface. It allows PCI devices that are
145 behind an IOMMU to recover from page faults.
150 bool "PCI PASID support"
153 Process Address Space Identifiers (PASIDs) can be used by PCI devices
154 to access more than one IO address space at the same time. To make
155 use of this feature an IOMMU is required which also supports PASIDs.
156 Select this option if you have such an IOMMU and want to compile the
157 driver for it into your kernel.
162 bool "PCI peer-to-peer transfer support"
163 depends on ZONE_DEVICE
164 select GENERIC_ALLOCATOR
166 Enableѕ drivers to do PCI peer-to-peer transactions to and from
167 BARs that are exposed in other devices that are the part of
168 the hierarchy where peer-to-peer DMA is guaranteed by the PCI
169 specification to work (ie. anything below a single PCI bridge).
171 Many PCIe root complexes do not support P2P transactions and
172 it's hard to tell which support it at all, so at this time,
173 P2P DMA transations must be between devices behind the same root
179 def_bool y if (DMI || ACPI)
183 tristate "Hyper-V PCI Frontend"
184 depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64
186 The PCI device frontend driver allows the kernel to import arbitrary
187 PCI devices from a PCI backend to support PCI driver domains.
189 source "drivers/pci/hotplug/Kconfig"
190 source "drivers/pci/controller/Kconfig"
191 source "drivers/pci/endpoint/Kconfig"
192 source "drivers/pci/switch/Kconfig"