2 # PCI Express Port Bus Configuration
5 bool "PCI Express Port Bus support"
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).
14 # Include service Kconfig here
16 config HOTPLUG_PCI_PCIE
17 bool "PCI Express Hotplug driver"
18 depends on HOTPLUG_PCI && PCIEPORTBUS
20 Say Y here if you have a motherboard that supports PCI Express Native
25 source "drivers/pci/pcie/aer/Kconfig"
31 bool "PCI Express ASPM control" if EXPERT
32 depends on PCI && PCIEPORTBUS
35 This enables OS control over PCI Express ASPM (Active State
36 Power Management) and Clock Power Management. ASPM supports
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.
43 ASPM can be disabled or enabled at runtime via
44 /sys/module/pcie_aspm/parameters/policy
49 bool "Debug PCI Express ASPM"
53 This enables PCI Express ASPM debug support. It will add per-device
54 interface to control ASPM.
57 prompt "Default ASPM policy"
58 default PCIEASPM_DEFAULT
61 config PCIEASPM_DEFAULT
65 Use the BIOS defaults for PCI Express ASPM.
67 config PCIEASPM_POWERSAVE
71 Enable PCI Express ASPM L0s and L1 where possible, even if the
74 config PCIEASPM_POWER_SUPERSAVE
75 bool "Power Supersave"
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.
82 config PCIEASPM_PERFORMANCE
86 Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them.
91 depends on PCIEPORTBUS && PM
94 bool "PCIe Downstream Port Containment support"
95 depends on PCIEPORTBUS
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.
105 bool "PCIe Precision Time Measurement support"
107 depends on PCIEPORTBUS
109 This enables PCI Express Precision Time Measurement (PTM)
112 This is only useful if you have devices that support PTM, but it
113 is safe to enable even if you don't.