1# SPDX-License-Identifier: GPL-2.0 2# 3# PCI configuration 4# 5 6source "drivers/pci/pcie/Kconfig" 7 8config PCI_MSI 9 bool "Message Signaled Interrupts (MSI and MSI-X)" 10 depends on PCI 11 select GENERIC_MSI_IRQ 12 help 13 This allows device drivers to enable MSI (Message Signaled 14 Interrupts). Message Signaled Interrupts enable a device to 15 generate an interrupt using an inbound Memory Write on its 16 PCI bus instead of asserting a device IRQ pin. 17 18 Use of PCI MSI interrupts can be disabled at kernel boot time 19 by using the 'pci=nomsi' option. This disables MSI for the 20 entire system. 21 22 If you don't know what to do here, say Y. 23 24config PCI_MSI_IRQ_DOMAIN 25 def_bool ARC || ARM || ARM64 || X86 26 depends on PCI_MSI 27 select GENERIC_MSI_IRQ_DOMAIN 28 29config PCI_QUIRKS 30 default y 31 bool "Enable PCI quirk workarounds" if EXPERT 32 depends on PCI 33 help 34 This enables workarounds for various PCI chipset bugs/quirks. 35 Disable this only if your target machine is unaffected by PCI 36 quirks. 37 38config PCI_DEBUG 39 bool "PCI Debugging" 40 depends on PCI && DEBUG_KERNEL 41 help 42 Say Y here if you want the PCI core to produce a bunch of debug 43 messages to the system log. Select this if you are having a 44 problem with PCI support and want to see more of what is going on. 45 46 When in doubt, say N. 47 48config PCI_REALLOC_ENABLE_AUTO 49 bool "Enable PCI resource re-allocation detection" 50 depends on PCI 51 depends on PCI_IOV 52 help 53 Say Y here if you want the PCI core to detect if PCI resource 54 re-allocation needs to be enabled. You can always use pci=realloc=on 55 or pci=realloc=off to override it. It will automatically 56 re-allocate PCI resources if SR-IOV BARs have not been allocated by 57 the BIOS. 58 59 When in doubt, say N. 60 61config PCI_STUB 62 tristate "PCI Stub driver" 63 depends on PCI 64 help 65 Say Y or M here if you want be able to reserve a PCI device 66 when it is going to be assigned to a guest operating system. 67 68 When in doubt, say N. 69 70config PCI_PF_STUB 71 tristate "PCI PF Stub driver" 72 depends on PCI 73 depends on PCI_IOV 74 help 75 Say Y or M here if you want to enable support for devices that 76 require SR-IOV support, while at the same time the PF itself is 77 not providing any actual services on the host itself such as 78 storage or networking. 79 80 When in doubt, say N. 81 82config XEN_PCIDEV_FRONTEND 83 tristate "Xen PCI Frontend" 84 depends on PCI && X86 && XEN 85 select PCI_XEN 86 select XEN_XENBUS_FRONTEND 87 default y 88 help 89 The PCI device frontend driver allows the kernel to import arbitrary 90 PCI devices from a PCI backend to support PCI driver domains. 91 92config PCI_ATS 93 bool 94 95config PCI_ECAM 96 bool 97 98config PCI_LOCKLESS_CONFIG 99 bool 100 101config PCI_IOV 102 bool "PCI IOV support" 103 depends on PCI 104 select PCI_ATS 105 help 106 I/O Virtualization is a PCI feature supported by some devices 107 which allows them to create virtual devices which share their 108 physical resources. 109 110 If unsure, say N. 111 112config PCI_PRI 113 bool "PCI PRI support" 114 depends on PCI 115 select PCI_ATS 116 help 117 PRI is the PCI Page Request Interface. It allows PCI devices that are 118 behind an IOMMU to recover from page faults. 119 120 If unsure, say N. 121 122config PCI_PASID 123 bool "PCI PASID support" 124 depends on PCI 125 select PCI_ATS 126 help 127 Process Address Space Identifiers (PASIDs) can be used by PCI devices 128 to access more than one IO address space at the same time. To make 129 use of this feature an IOMMU is required which also supports PASIDs. 130 Select this option if you have such an IOMMU and want to compile the 131 driver for it into your kernel. 132 133 If unsure, say N. 134 135config PCI_LABEL 136 def_bool y if (DMI || ACPI) 137 depends on PCI 138 select NLS 139 140config PCI_HYPERV 141 tristate "Hyper-V PCI Frontend" 142 depends on PCI && X86 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && X86_64 143 help 144 The PCI device frontend driver allows the kernel to import arbitrary 145 PCI devices from a PCI backend to support PCI driver domains. 146 147source "drivers/pci/hotplug/Kconfig" 148source "drivers/pci/controller/Kconfig" 149source "drivers/pci/endpoint/Kconfig" 150source "drivers/pci/switch/Kconfig" 151