| rjw | 1f88458 | 2022-01-06 17:20:42 +0800 | [diff] [blame^] | 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. |