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 24if PCI 25 26config PCI_DOMAINS 27 bool 28 depends on PCI 29 30config PCI_DOMAINS_GENERIC 31 bool 32 select PCI_DOMAINS 33 34config PCI_SYSCALL 35 bool 36 37source "drivers/pci/pcie/Kconfig" 38 39config PCI_MSI 40 bool "Message Signaled Interrupts (MSI and MSI-X)" 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 help 63 This enables workarounds for various PCI chipset bugs/quirks. 64 Disable this only if your target machine is unaffected by PCI 65 quirks. 66 67config PCI_DEBUG 68 bool "PCI Debugging" 69 depends on DEBUG_KERNEL 70 help 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. 74 75 When in doubt, say N. 76 77config PCI_REALLOC_ENABLE_AUTO 78 bool "Enable PCI resource re-allocation detection" 79 depends on PCI_IOV 80 help 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 85 the BIOS. 86 87 When in doubt, say N. 88 89config PCI_STUB 90 tristate "PCI Stub driver" 91 help 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. 94 95 When in doubt, say N. 96 97config PCI_PF_STUB 98 tristate "PCI PF Stub driver" 99 depends on PCI_IOV 100 help 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. 105 106 When in doubt, say N. 107 108config XEN_PCIDEV_FRONTEND 109 tristate "Xen PCI Frontend" 110 depends on X86 && XEN 111 select PCI_XEN 112 select XEN_XENBUS_FRONTEND 113 default y 114 help 115 The PCI device frontend driver allows the kernel to import arbitrary 116 PCI devices from a PCI backend to support PCI driver domains. 117 118config PCI_ATS 119 bool 120 121config PCI_ECAM 122 bool 123 124config PCI_LOCKLESS_CONFIG 125 bool 126 127config PCI_BRIDGE_EMUL 128 bool 129 130config PCI_IOV 131 bool "PCI IOV support" 132 select PCI_ATS 133 help 134 I/O Virtualization is a PCI feature supported by some devices 135 which allows them to create virtual devices which share their 136 physical resources. 137 138 If unsure, say N. 139 140config PCI_PRI 141 bool "PCI PRI support" 142 select PCI_ATS 143 help 144 PRI is the PCI Page Request Interface. It allows PCI devices that are 145 behind an IOMMU to recover from page faults. 146 147 If unsure, say N. 148 149config PCI_PASID 150 bool "PCI PASID support" 151 select PCI_ATS 152 help 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. 158 159 If unsure, say N. 160 161config PCI_P2PDMA 162 bool "PCI peer-to-peer transfer support" 163 depends on ZONE_DEVICE 164 select GENERIC_ALLOCATOR 165 help 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). 170 171 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 174 port. 175 176 If unsure, say N. 177 178config PCI_LABEL 179 def_bool y if (DMI || ACPI) 180 select NLS 181 182config PCI_HYPERV 183 tristate "Hyper-V PCI Frontend" 184 depends on X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64 185 help 186 The PCI device frontend driver allows the kernel to import arbitrary 187 PCI devices from a PCI backend to support PCI driver domains. 188 189source "drivers/pci/hotplug/Kconfig" 190source "drivers/pci/controller/Kconfig" 191source "drivers/pci/endpoint/Kconfig" 192source "drivers/pci/switch/Kconfig" 193 194endif 195