drivers/pci/pcie/Kconfig

   1 #
   2 # PCI Express Port Bus Configuration
   3 #
   4 config PCIEPORTBUS
   5         bool "PCI Express Port Bus support"
   6         depends on PCI
   7         help
   8           This automatically enables PCI Express Port Bus support. Users can
   9           choose Native Hot-Plug support, Advanced Error Reporting support,
  10           Power Management Event support and Virtual Channel support to run
  11           on PCI Express Ports (Root or Switch).
  12
  13 #
  14 # Include service Kconfig here
  15 #
  16 config HOTPLUG_PCI_PCIE
  17         bool "PCI Express Hotplug driver"
  18         depends on HOTPLUG_PCI && PCIEPORTBUS
  19         help
  20           Say Y here if you have a motherboard that supports PCI Express Native
  21           Hotplug
  22
  23           When in doubt, say N.
  24
  25 source "drivers/pci/pcie/aer/Kconfig"
  26
  27 #
  28 # PCI Express ASPM
  29 #
  30 config PCIEASPM
  31         bool "PCI Express ASPM control" if EXPERT
  32         depends on PCI && PCIEPORTBUS
  33         default y
  34         help
  35           This enables OS control over PCI Express ASPM (Active State
  36           Power Management) and Clock Power Management. ASPM supports
  37           state L0/L0s/L1.
  38
  39           ASPM is initially set up by the firmware. With this option enabled,
  40           Linux can modify this state in order to disable ASPM on known-bad
  41           hardware or configurations and enable it when known-safe.
  42
  43           ASPM can be disabled or enabled at runtime via
  44           /sys/module/pcie_aspm/parameters/policy
  45
  46           When in doubt, say Y.
  47
  48 config PCIEASPM_DEBUG
  49         bool "Debug PCI Express ASPM"
  50         depends on PCIEASPM
  51         default n
  52         help
  53           This enables PCI Express ASPM debug support. It will add per-device
  54           interface to control ASPM.
  55
  56 choice
  57         prompt "Default ASPM policy"
  58         default PCIEASPM_DEFAULT
  59         depends on PCIEASPM
  60
  61 config PCIEASPM_DEFAULT
  62         bool "BIOS default"
  63         depends on PCIEASPM
  64         help
  65           Use the BIOS defaults for PCI Express ASPM.
  66
  67 config PCIEASPM_POWERSAVE
  68         bool "Powersave"
  69         depends on PCIEASPM
  70         help
  71           Enable PCI Express ASPM L0s and L1 where possible, even if the
  72           BIOS did not.
  73
  74 config PCIEASPM_POWER_SUPERSAVE
  75         bool "Power Supersave"
  76         depends on PCIEASPM
  77         help
  78           Same as PCIEASPM_POWERSAVE, except it also enables L1 substates where
  79           possible. This would result in higher power savings while staying in L1
  80           where the components support it.
  81
  82 config PCIEASPM_PERFORMANCE
  83         bool "Performance"
  84         depends on PCIEASPM
  85         help
  86           Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them.
  87 endchoice
  88
  89 config PCIE_PME
  90         def_bool y
  91         depends on PCIEPORTBUS && PM
  92
  93 config PCIE_DPC
  94         bool "PCIe Downstream Port Containment support"
  95         depends on PCIEPORTBUS
  96         default n
  97         help
  98           This enables PCI Express Downstream Port Containment (DPC)
  99           driver support.  DPC events from Root and Downstream ports
 100           will be handled by the DPC driver.  If your system doesn't
 101           have this capability or you do not want to use this feature,
 102           it is safe to answer N.
 103
 104 config PCIE_PTM
 105         bool "PCIe Precision Time Measurement support"
 106         default n
 107         depends on PCIEPORTBUS
 108         help
 109           This enables PCI Express Precision Time Measurement (PTM)
 110           support.
 111
 112           This is only useful if you have devices that support PTM, but it
 113           is safe to enable even if you don't.