1# SPDX-License-Identifier: GPL-2.0 2# 3# PCI configuration 4# 5 6# select this to offer the PCI prompt 7config HAVE_PCI 8 bool 9 10# select this to unconditionally force on PCI support 11config FORCE_PCI 12 bool 13 select HAVE_PCI 14 select PCI 15 16menuconfig PCI 17 bool "PCI support" 18 depends on HAVE_PCI 19 help 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. 23 24config PCI_DOMAINS 25 bool 26 depends on PCI 27 28config PCI_DOMAINS_GENERIC 29 bool 30 depends on PCI 31 select PCI_DOMAINS 32 33config PCI_SYSCALL 34 bool 35 36source "drivers/pci/pcie/Kconfig" 37 38config PCI_MSI 39 bool "Message Signaled Interrupts (MSI and MSI-X)" 40 depends on PCI 41 select GENERIC_MSI_IRQ 42 help 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. 47 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 50 entire system. 51 52 If you don't know what to do here, say Y. 53 54config PCI_MSI_IRQ_DOMAIN 55 def_bool ARC || ARM || ARM64 || X86 56 depends on PCI_MSI 57 select GENERIC_MSI_IRQ_DOMAIN 58 59config PCI_QUIRKS 60 default y 61 bool "Enable PCI quirk workarounds" if EXPERT 62 depends on PCI 63 help 64 This enables workarounds for various PCI chipset bugs/quirks. 65 Disable this only if your target machine is unaffected by PCI 66 quirks. 67 68config PCI_DEBUG 69 bool "PCI Debugging" 70 depends on PCI && DEBUG_KERNEL 71 help 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. 75 76 When in doubt, say N. 77 78config PCI_REALLOC_ENABLE_AUTO 79 bool "Enable PCI resource re-allocation detection" 80 depends on PCI 81 depends on PCI_IOV 82 help 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 87 the BIOS. 88 89 When in doubt, say N. 90 91config PCI_STUB 92 tristate "PCI Stub driver" 93 depends on PCI 94 help 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. 97 98 When in doubt, say N. 99 100config PCI_PF_STUB 101 tristate "PCI PF Stub driver" 102 depends on PCI 103 depends on PCI_IOV 104 help 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 (Physical 107 Function) itself is not providing any actual services on the 108 host itself such as storage or networking. 109 110 When in doubt, say N. 111 112config XEN_PCIDEV_FRONTEND 113 tristate "Xen PCI Frontend" 114 depends on PCI && X86 && XEN 115 select PCI_XEN 116 select XEN_XENBUS_FRONTEND 117 default y 118 help 119 The PCI device frontend driver allows the kernel to import arbitrary 120 PCI devices from a PCI backend to support PCI driver domains. 121 122config PCI_ATS 123 bool 124 125config PCI_ECAM 126 bool 127 128config PCI_LOCKLESS_CONFIG 129 bool 130 131config PCI_BRIDGE_EMUL 132 bool 133 134config PCI_IOV 135 bool "PCI IOV support" 136 depends on PCI 137 select PCI_ATS 138 help 139 I/O Virtualization is a PCI feature supported by some devices 140 which allows them to create virtual devices which share their 141 physical resources. 142 143 If unsure, say N. 144 145config PCI_PRI 146 bool "PCI PRI support" 147 depends on PCI 148 select PCI_ATS 149 help 150 PRI is the PCI Page Request Interface. It allows PCI devices that are 151 behind an IOMMU to recover from page faults. 152 153 If unsure, say N. 154 155config PCI_PASID 156 bool "PCI PASID support" 157 depends on PCI 158 select PCI_ATS 159 help 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. 165 166 If unsure, say N. 167 168config PCI_P2PDMA 169 bool "PCI peer-to-peer transfer support" 170 depends on PCI && ZONE_DEVICE 171 select GENERIC_ALLOCATOR 172 help 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). 177 178 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 181 port. 182 183 If unsure, say N. 184 185config PCI_LABEL 186 def_bool y if (DMI || ACPI) 187 depends on PCI 188 select NLS 189 190config PCI_HYPERV 191 tristate "Hyper-V PCI Frontend" 192 depends on PCI && X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64 193 help 194 The PCI device frontend driver allows the kernel to import arbitrary 195 PCI devices from a PCI backend to support PCI driver domains. 196 197source "drivers/pci/hotplug/Kconfig" 198source "drivers/pci/controller/Kconfig" 199source "drivers/pci/endpoint/Kconfig" 200source "drivers/pci/switch/Kconfig" 201