0001 # SPDX-License-Identifier: GPL-2.0
0002 #
0003 # PCI Express Port Bus Configuration
0004 #
0005 config PCIEPORTBUS
0006 bool "PCI Express Port Bus support"
0007 help
0008 This enables PCI Express Port Bus support. Users can then enable
0009 support for Native Hot-Plug, Advanced Error Reporting, Power
0010 Management Events, and Downstream Port Containment.
0011
0012 #
0013 # Include service Kconfig here
0014 #
0015 config HOTPLUG_PCI_PCIE
0016 bool "PCI Express Hotplug driver"
0017 depends on HOTPLUG_PCI && PCIEPORTBUS
0018 help
0019 Say Y here if you have a motherboard that supports PCI Express Native
0020 Hotplug
0021
0022 When in doubt, say N.
0023
0024 config PCIEAER
0025 bool "PCI Express Advanced Error Reporting support"
0026 depends on PCIEPORTBUS
0027 select RAS
0028 help
0029 This enables PCI Express Root Port Advanced Error Reporting
0030 (AER) driver support. Error reporting messages sent to Root
0031 Port will be handled by PCI Express AER driver.
0032
0033 config PCIEAER_INJECT
0034 tristate "PCI Express error injection support"
0035 depends on PCIEAER
0036 select GENERIC_IRQ_INJECTION
0037 help
0038 This enables PCI Express Root Port Advanced Error Reporting
0039 (AER) software error injector.
0040
0041 Debugging AER code is quite difficult because it is hard
0042 to trigger various real hardware errors. Software-based
0043 error injection can fake almost all kinds of errors with the
0044 help of a user space helper tool aer-inject, which can be
0045 gotten from:
0046 https://git.kernel.org/cgit/linux/kernel/git/gong.chen/aer-inject.git/
0047
0048 #
0049 # PCI Express ECRC
0050 #
0051 config PCIE_ECRC
0052 bool "PCI Express ECRC settings control"
0053 depends on PCIEAER
0054 help
0055 Used to override firmware/bios settings for PCI Express ECRC
0056 (transaction layer end-to-end CRC checking).
0057
0058 When in doubt, say N.
0059
0060 #
0061 # PCI Express ASPM
0062 #
0063 config PCIEASPM
0064 bool "PCI Express ASPM control" if EXPERT
0065 default y
0066 help
0067 This enables OS control over PCI Express ASPM (Active State
0068 Power Management) and Clock Power Management. ASPM supports
0069 state L0/L0s/L1.
0070
0071 ASPM is initially set up by the firmware. With this option enabled,
0072 Linux can modify this state in order to disable ASPM on known-bad
0073 hardware or configurations and enable it when known-safe.
0074
0075 ASPM can be disabled or enabled at runtime via
0076 /sys/module/pcie_aspm/parameters/policy
0077
0078 When in doubt, say Y.
0079
0080 choice
0081 prompt "Default ASPM policy"
0082 default PCIEASPM_DEFAULT
0083 depends on PCIEASPM
0084
0085 config PCIEASPM_DEFAULT
0086 bool "BIOS default"
0087 depends on PCIEASPM
0088 help
0089 Use the BIOS defaults for PCI Express ASPM.
0090
0091 config PCIEASPM_POWERSAVE
0092 bool "Powersave"
0093 depends on PCIEASPM
0094 help
0095 Enable PCI Express ASPM L0s and L1 where possible, even if the
0096 BIOS did not.
0097
0098 config PCIEASPM_POWER_SUPERSAVE
0099 bool "Power Supersave"
0100 depends on PCIEASPM
0101 help
0102 Same as PCIEASPM_POWERSAVE, except it also enables L1 substates where
0103 possible. This would result in higher power savings while staying in L1
0104 where the components support it.
0105
0106 config PCIEASPM_PERFORMANCE
0107 bool "Performance"
0108 depends on PCIEASPM
0109 help
0110 Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them.
0111 endchoice
0112
0113 config PCIE_PME
0114 def_bool y
0115 depends on PCIEPORTBUS && PM
0116
0117 config PCIE_DPC
0118 bool "PCI Express Downstream Port Containment support"
0119 depends on PCIEPORTBUS && PCIEAER
0120 help
0121 This enables PCI Express Downstream Port Containment (DPC)
0122 driver support. DPC events from Root and Downstream ports
0123 will be handled by the DPC driver. If your system doesn't
0124 have this capability or you do not want to use this feature,
0125 it is safe to answer N.
0126
0127 config PCIE_PTM
0128 bool "PCI Express Precision Time Measurement support"
0129 help
0130 This enables PCI Express Precision Time Measurement (PTM)
0131 support.
0132
0133 This is only useful if you have devices that support PTM, but it
0134 is safe to enable even if you don't.
0135
0136 config PCIE_EDR
0137 bool "PCI Express Error Disconnect Recover support"
0138 depends on PCIE_DPC && ACPI
0139 help
0140 This option adds Error Disconnect Recover support as specified
0141 in the Downstream Port Containment Related Enhancements ECN to
0142 the PCI Firmware Specification r3.2. Enable this if you want to
0143 support hybrid DPC model which uses both firmware and OS to
0144 implement DPC.
