1# SPDX-License-Identifier: GPL-2.0 2# 3# PCI Express Port Bus Configuration 4# 5config PCIEPORTBUS 6 bool "PCI Express Port Bus support" 7 depends on PCI 8 help 9 This automatically enables PCI Express Port Bus support. Users can 10 choose Native Hot-Plug support, Advanced Error Reporting support, 11 Power Management Event support and Virtual Channel support to run 12 on PCI Express Ports (Root or Switch). 13 14# 15# Include service Kconfig here 16# 17config HOTPLUG_PCI_PCIE 18 bool "PCI Express Hotplug driver" 19 depends on HOTPLUG_PCI && PCIEPORTBUS 20 help 21 Say Y here if you have a motherboard that supports PCI Express Native 22 Hotplug 23 24 When in doubt, say N. 25 26config PCIEAER 27 bool "PCI Express Advanced Error Reporting support" 28 depends on PCIEPORTBUS 29 select RAS 30 default y 31 help 32 This enables PCI Express Root Port Advanced Error Reporting 33 (AER) driver support. Error reporting messages sent to Root 34 Port will be handled by PCI Express AER driver. 35 36config PCIEAER_INJECT 37 tristate "PCI Express error injection support" 38 depends on PCIEAER 39 help 40 This enables PCI Express Root Port Advanced Error Reporting 41 (AER) software error injector. 42 43 Debugging AER code is quite difficult because it is hard 44 to trigger various real hardware errors. Software-based 45 error injection can fake almost all kinds of errors with the 46 help of a user space helper tool aer-inject, which can be 47 gotten from: 48 http://www.kernel.org/pub/linux/utils/pci/aer-inject/ 49 50# 51# PCI Express ECRC 52# 53config PCIE_ECRC 54 bool "PCI Express ECRC settings control" 55 depends on PCIEAER 56 help 57 Used to override firmware/bios settings for PCI Express ECRC 58 (transaction layer end-to-end CRC checking). 59 60 When in doubt, say N. 61 62# 63# PCI Express ASPM 64# 65config PCIEASPM 66 bool "PCI Express ASPM control" if EXPERT 67 depends on PCI && PCIEPORTBUS 68 default y 69 help 70 This enables OS control over PCI Express ASPM (Active State 71 Power Management) and Clock Power Management. ASPM supports 72 state L0/L0s/L1. 73 74 ASPM is initially set up by the firmware. With this option enabled, 75 Linux can modify this state in order to disable ASPM on known-bad 76 hardware or configurations and enable it when known-safe. 77 78 ASPM can be disabled or enabled at runtime via 79 /sys/module/pcie_aspm/parameters/policy 80 81 When in doubt, say Y. 82 83config PCIEASPM_DEBUG 84 bool "Debug PCI Express ASPM" 85 depends on PCIEASPM 86 help 87 This enables PCI Express ASPM debug support. It will add per-device 88 interface to control ASPM. 89 90choice 91 prompt "Default ASPM policy" 92 default PCIEASPM_DEFAULT 93 depends on PCIEASPM 94 95config PCIEASPM_DEFAULT 96 bool "BIOS default" 97 depends on PCIEASPM 98 help 99 Use the BIOS defaults for PCI Express ASPM. 100 101config PCIEASPM_POWERSAVE 102 bool "Powersave" 103 depends on PCIEASPM 104 help 105 Enable PCI Express ASPM L0s and L1 where possible, even if the 106 BIOS did not. 107 108config PCIEASPM_POWER_SUPERSAVE 109 bool "Power Supersave" 110 depends on PCIEASPM 111 help 112 Same as PCIEASPM_POWERSAVE, except it also enables L1 substates where 113 possible. This would result in higher power savings while staying in L1 114 where the components support it. 115 116config PCIEASPM_PERFORMANCE 117 bool "Performance" 118 depends on PCIEASPM 119 help 120 Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them. 121endchoice 122 123config PCIE_PME 124 def_bool y 125 depends on PCIEPORTBUS && PM 126 127config PCIE_DPC 128 bool "PCI Express Downstream Port Containment support" 129 depends on PCIEPORTBUS && PCIEAER 130 help 131 This enables PCI Express Downstream Port Containment (DPC) 132 driver support. DPC events from Root and Downstream ports 133 will be handled by the DPC driver. If your system doesn't 134 have this capability or you do not want to use this feature, 135 it is safe to answer N. 136 137config PCIE_PTM 138 bool "PCI Express Precision Time Measurement support" 139 depends on PCIEPORTBUS 140 help 141 This enables PCI Express Precision Time Measurement (PTM) 142 support. 143 144 This is only useful if you have devices that support PTM, but it 145 is safe to enable even if you don't. 146