2# PCI configuration
   5        bool
   7config PCI_MSI
   8        bool "Message Signaled Interrupts (MSI and MSI-X)"
   9        depends on PCI
  10        depends on ARCH_SUPPORTS_MSI
  11        help
  12           This allows device drivers to enable MSI (Message Signaled
  13           Interrupts).  Message Signaled Interrupts enable a device to
  14           generate an interrupt using an inbound Memory Write on its
  15           PCI bus instead of asserting a device IRQ pin.
  17           Use of PCI MSI interrupts can be disabled at kernel boot time
  18           by using the 'pci=nomsi' option.  This disables MSI for the
  19           entire system.
  21           If you don't know what to do here, say Y.
  23config PCI_DEBUG
  24        bool "PCI Debugging"
  25        depends on PCI && DEBUG_KERNEL
  26        help
  27          Say Y here if you want the PCI core to produce a bunch of debug
  28          messages to the system log.  Select this if you are having a
  29          problem with PCI support and want to see more of what is going on.
  31          When in doubt, say N.
  34        bool "Enable PCI resource re-allocation detection"
  35        depends on PCI
  36        help
  37          Say Y here if you want the PCI core to detect if PCI resource
  38          re-allocation needs to be enabled. You can always use pci=realloc=on
  39          or pci=realloc=off to override it.  Note this feature is a no-op
  40          unless PCI_IOV support is also enabled; in that case it will
  41          automatically re-allocate PCI resources if SR-IOV BARs have not
  42          been allocated by the BIOS.
  44          When in doubt, say N.
  46config PCI_STUB
  47        tristate "PCI Stub driver"
  48        depends on PCI
  49        help
  50          Say Y or M here if you want be able to reserve a PCI device
  51          when it is going to be assigned to a guest operating system.
  53          When in doubt, say N.
  56        tristate "Xen PCI Frontend"
  57        depends on PCI && X86 && XEN
  58        select HOTPLUG
  59        select PCI_XEN
  60        select XEN_XENBUS_FRONTEND
  61        default y
  62        help
  63          The PCI device frontend driver allows the kernel to import arbitrary
  64          PCI devices from a PCI backend to support PCI driver domains.
  66config HT_IRQ
  67        bool "Interrupts on hypertransport devices"
  68        default y
  69        depends on PCI && X86_LOCAL_APIC && X86_IO_APIC
  70        help
  71           This allows native hypertransport devices to use interrupts.
  73           If unsure say Y.
  75config PCI_ATS
  76        bool
  78config PCI_IOV
  79        bool "PCI IOV support"
  80        depends on PCI
  81        select PCI_ATS
  82        help
  83          I/O Virtualization is a PCI feature supported by some devices
  84          which allows them to create virtual devices which share their
  85          physical resources.
  87          If unsure, say N.
  89config PCI_PRI
  90        bool "PCI PRI support"
  91        depends on PCI
  92        select PCI_ATS
  93        help
  94          PRI is the PCI Page Request Interface. It allows PCI devices that are
  95          behind an IOMMU to recover from page faults.
  97          If unsure, say N.
  99config PCI_PASID
 100        bool "PCI PASID support"
 101        depends on PCI
 102        select PCI_ATS
 103        help
 104          Process Address Space Identifiers (PASIDs) can be used by PCI devices
 105          to access more than one IO address space at the same time. To make
 106          use of this feature an IOMMU is required which also supports PASIDs.
 107          Select this option if you have such an IOMMU and want to compile the
 108          driver for it into your kernel.
 110          If unsure, say N.
 112config PCI_IOAPIC
 113        tristate "PCI IO-APIC hotplug support" if X86
 114        depends on PCI
 115        depends on ACPI
 116        depends on HOTPLUG
 117        default !X86
 119config PCI_LABEL
 120        def_bool y if (DMI || ACPI)
 121        select NLS
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