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# SPDX-License-Identifier: GPL-2.0 # # PCI Express Port Bus Configuration # config PCIEPORTBUS bool "PCI Express Port Bus support" depends on PCI help This enables PCI Express Port Bus support. Users can then enable support for Native Hot-Plug, Advanced Error Reporting, Power Management Events, and Downstream Port Containment. # # Include service Kconfig here # config HOTPLUG_PCI_PCIE bool "PCI Express Hotplug driver" depends on HOTPLUG_PCI && PCIEPORTBUS help Say Y here if you have a motherboard that supports PCI Express Native Hotplug When in doubt, say N. config PCIEAER bool "PCI Express Advanced Error Reporting support" depends on PCIEPORTBUS select RAS default y help This enables PCI Express Root Port Advanced Error Reporting (AER) driver support. Error reporting messages sent to Root Port will be handled by PCI Express AER driver. config PCIEAER_INJECT tristate "PCI Express error injection support" depends on PCIEAER help This enables PCI Express Root Port Advanced Error Reporting (AER) software error injector. Debugging AER code is quite difficult because it is hard to trigger various real hardware errors. Software-based error injection can fake almost all kinds of errors with the help of a user space helper tool aer-inject, which can be gotten from: http://www.kernel.org/pub/linux/utils/pci/aer-inject/ # # PCI Express ECRC # config PCIE_ECRC bool "PCI Express ECRC settings control" depends on PCIEAER help Used to override firmware/bios settings for PCI Express ECRC (transaction layer end-to-end CRC checking). When in doubt, say N. # # PCI Express ASPM # config PCIEASPM bool "PCI Express ASPM control" if EXPERT depends on PCI && PCIEPORTBUS default y help This enables OS control over PCI Express ASPM (Active State Power Management) and Clock Power Management. ASPM supports state L0/L0s/L1. ASPM is initially set up by the firmware. With this option enabled, Linux can modify this state in order to disable ASPM on known-bad hardware or configurations and enable it when known-safe. ASPM can be disabled or enabled at runtime via /sys/module/pcie_aspm/parameters/policy When in doubt, say Y. choice prompt "Default ASPM policy" default PCIEASPM_DEFAULT depends on PCIEASPM config PCIEASPM_DEFAULT bool "BIOS default" depends on PCIEASPM help Use the BIOS defaults for PCI Express ASPM. config PCIEASPM_POWERSAVE bool "Powersave" depends on PCIEASPM help Enable PCI Express ASPM L0s and L1 where possible, even if the BIOS did not. config PCIEASPM_POWER_SUPERSAVE bool "Power Supersave" depends on PCIEASPM help Same as PCIEASPM_POWERSAVE, except it also enables L1 substates where possible. This would result in higher power savings while staying in L1 where the components support it. config PCIEASPM_PERFORMANCE bool "Performance" depends on PCIEASPM help Disable PCI Express ASPM L0s and L1, even if the BIOS enabled them. endchoice config PCIE_PME def_bool y depends on PCIEPORTBUS && PM config PCIE_DPC bool "PCI Express Downstream Port Containment support" depends on PCIEPORTBUS && PCIEAER help This enables PCI Express Downstream Port Containment (DPC) driver support. DPC events from Root and Downstream ports will be handled by the DPC driver. If your system doesn't have this capability or you do not want to use this feature, it is safe to answer N. config PCIE_PTM bool "PCI Express Precision Time Measurement support" depends on PCIEPORTBUS help This enables PCI Express Precision Time Measurement (PTM) support. This is only useful if you have devices that support PTM, but it is safe to enable even if you don't. config PCIE_BW bool "PCI Express Bandwidth Change Notification" depends on PCIEPORTBUS help This enables PCI Express Bandwidth Change Notification. If you know link width or rate changes occur only to correct unreliable links, you may answer Y.
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