xref: /openbmc/linux/drivers/pci/pcie/Kconfig (revision 6dfcd296) 
1#
2# PCI Express Port Bus Configuration
3#
4config 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#
16config 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
25source "drivers/pci/pcie/aer/Kconfig"
26
27#
28# PCI Express ASPM
29#
30config 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
48config 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
56choice
57	prompt "Default ASPM policy"
58	default PCIEASPM_DEFAULT
59	depends on PCIEASPM
60
61config PCIEASPM_DEFAULT
62	bool "BIOS default"
63	depends on PCIEASPM
64	help
65	  Use the BIOS defaults for PCI Express ASPM.
66
67config 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
74config PCIEASPM_PERFORMANCE
75	bool "Performance"
76	depends on PCIEASPM
77	help
78	  Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them.
79endchoice
80
81config PCIE_PME
82	def_bool y
83	depends on PCIEPORTBUS && PM
84
85config PCIE_DPC
86	bool "PCIe Downstream Port Containment support"
87	depends on PCIEPORTBUS
88	default n
89	help
90	  This enables PCI Express Downstream Port Containment (DPC)
91	  driver support.  DPC events from Root and Downstream ports
92	  will be handled by the DPC driver.  If your system doesn't
93	  have this capability or you do not want to use this feature,
94	  it is safe to answer N.
95
96config PCIE_PTM
97	bool "PCIe Precision Time Measurement support"
98	default n
99	depends on PCIEPORTBUS
100	help
101	  This enables PCI Express Precision Time Measurement (PTM)
102	  support.
103
104	  This is only useful if you have devices that support PTM, but it
105	  is safe to enable even if you don't.
106