drivers/pci/Kconfig

   1 # SPDX-License-Identifier: GPL-2.0
   2 #
   3 # PCI configuration
   4 #
   5
   6 # select this to offer the PCI prompt
   7 config HAVE_PCI
   8         bool
   9
  10 # select this to unconditionally force on PCI support
  11 config FORCE_PCI
  12         bool
  13         select HAVE_PCI
  14         select PCI
  15
  16 menuconfig 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
  24 if PCI
  25
  26 config PCI_DOMAINS
  27         bool
  28         depends on PCI
  29
  30 config PCI_DOMAINS_GENERIC
  31         bool
  32         select PCI_DOMAINS
  33
  34 config PCI_SYSCALL
  35         bool
  36
  37 source "drivers/pci/pcie/Kconfig"
  38
  39 config 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
  54 config PCI_MSI_IRQ_DOMAIN
  55         def_bool y
  56         depends on PCI_MSI
  57         select GENERIC_MSI_IRQ_DOMAIN
  58
  59 config 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
  67 config 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
  77 config 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
  89 config 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
  97 config 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
 108 config 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
 118 config PCI_ATS
 119         bool
 120
 121 config PCI_ECAM
 122         bool
 123
 124 config PCI_LOCKLESS_CONFIG
 125         bool
 126
 127 config PCI_BRIDGE_EMUL
 128         bool
 129
 130 config 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
 140 config 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
 149 config 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
 161 config 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 transactions must be between devices behind the same root
 174           port.
 175
 176           If unsure, say N.
 177
 178 config PCI_LABEL
 179         def_bool y if (DMI || ACPI)
 180         select NLS
 181
 182 config PCI_HYPERV
 183         tristate "Hyper-V PCI Frontend"
 184         depends on X86_64 && HYPERV && PCI_MSI && PCI_MSI_IRQ_DOMAIN && SYSFS
 185         select PCI_HYPERV_INTERFACE
 186         help
 187           The PCI device frontend driver allows the kernel to import arbitrary
 188           PCI devices from a PCI backend to support PCI driver domains.
 189
 190 source "drivers/pci/hotplug/Kconfig"
 191 source "drivers/pci/controller/Kconfig"
 192 source "drivers/pci/endpoint/Kconfig"
 193 source "drivers/pci/switch/Kconfig"
 194
 195 endif