WSL2-Linux-Kernel/drivers/pci/pcie/Kconfig

#
# PCI Express Port Bus Configuration
#
config PCIEPORTBUS
	bool "PCI Express support"
	depends on PCI
	help
	  This automatically enables PCI Express Port Bus support. Users can
	  choose Native Hot-Plug support, Advanced Error Reporting support,
	  Power Management Event support and Virtual Channel support to run
	  on PCI Express Ports (Root or Switch).

#
# Include service Kconfig here
#
config HOTPLUG_PCI_PCIE
	tristate "PCI Express Hotplug driver"
	depends on HOTPLUG_PCI && PCIEPORTBUS
	help
	  Say Y here if you have a motherboard that supports PCI Express Native
	  Hotplug

	  To compile this driver as a module, choose M here: the
	  module will be called pciehp.

	  When in doubt, say N.

source "drivers/pci/pcie/aer/Kconfig"

#
# PCI Express ASPM
#
config PCIEASPM
	bool "PCI Express ASPM support(Experimental)"
	depends on PCI && EXPERIMENTAL && PCIEPORTBUS
	default n
	help
	  This enables PCI Express ASPM (Active State Power Management) and
	  Clock Power Management. ASPM supports state L0/L0s/L1.

	  When in doubt, say N.
config PCIEASPM_DEBUG
	bool "Debug PCI Express ASPM"
	depends on PCIEASPM
	default n
	help
	  This enables PCI Express ASPM debug support. It will add per-device
	  interface to control ASPM.
Linux-2.6.12-rc2 Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip! 2005-04-17 02:20:36 +04:00			`#`
			`# PCI Express Port Bus Configuration`
			`#`
			`config PCIEPORTBUS`
			`bool "PCI Express support"`
			`depends on PCI`
			`help`
			`This automatically enables PCI Express Port Bus support. Users can`
			`choose Native Hot-Plug support, Advanced Error Reporting support,`
			`Power Management Event support and Virtual Channel support to run`
			`on PCI Express Ports (Root or Switch).`

			`#`
			`# Include service Kconfig here`
			`#`
			`config HOTPLUG_PCI_PCIE`
			`tristate "PCI Express Hotplug driver"`
			`depends on HOTPLUG_PCI && PCIEPORTBUS`
			`help`
			`Say Y here if you have a motherboard that supports PCI Express Native`
			`Hotplug`

			`To compile this driver as a module, choose M here: the`
			`module will be called pciehp.`

			`When in doubt, say N.`

PCI-Express AER implemetation: AER core and aerdriver Patch 3 implements the core part of PCI-Express AER and aerdrv port service driver. When a root port service device is probed, the aerdrv will call request_irq to register irq handler for AER error interrupt. When a device sends an PCI-Express error message to the root port, the root port will trigger an interrupt, by either MSI or IO-APIC, then kernel would run the irq handler. The handler collects root error status register and schedules a work. The work will call the core part to process the error based on its type (Correctable/non-fatal/fatal). As for Correctable errors, the patch chooses to just clear the correctable error status register of the device. As for the non-fatal error, the patch follows generic PCI error handler rules to call the error callback functions of the endpoint's driver. If the device is a bridge, the patch chooses to broadcast the error to downstream devices. As for the fatal error, the patch resets the pci-express link and follows generic PCI error handler rules to call the error callback functions of the endpoint's driver. If the device is a bridge, the patch chooses to broadcast the error to downstream devices. Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> 2006-07-31 11:21:33 +04:00			`source "drivers/pci/pcie/aer/Kconfig"`
PCI: add PCI Express ASPM support PCI Express ASPM defines a protocol for PCI Express components in the D0 state to reduce Link power by placing their Links into a low power state and instructing the other end of the Link to do likewise. This capability allows hardware-autonomous, dynamic Link power reduction beyond what is achievable by software-only controlled power management. However, The device should be configured by software appropriately. Enabling ASPM will save power, but will introduce device latency. This patch adds ASPM support in Linux. It introduces a global policy for ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control it. The interface can be used as a boot option too. Currently we have below setting: -default, BIOS default setting -powersave, highest power saving mode, enable all available ASPM state and clock power management -performance, highest performance, disable ASPM and clock power management By default, the 'default' policy is used currently. In my test, power difference between powersave mode and performance mode is about 1.3w in a system with 3 PCIE links. Note: some devices might not work well with aspm, either because chipset issue or device issue. The patch provide API (pci_disable_link_state), driver can disable ASPM for specific device. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> 2008-02-25 04:46:41 +03:00
			`#`
			`# PCI Express ASPM`
			`#`
			`config PCIEASPM`
			`bool "PCI Express ASPM support(Experimental)"`
			`depends on PCI && EXPERIMENTAL && PCIEPORTBUS`
PCI Express ASPM support should default to 'No' Running 'make oldconfig' I just noticed that PCIEASPM defaults to 'y' in Kconfig even though the feature is both experimental and the help text recommends that if you are unsure you say 'n'. It seems to me that this really should default to 'n', not 'y' at the moment. The following patch makes that change. Please consider applying. Signed-off-by: Jesper Juhl <jesper.juhl@gmail.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org> 2008-04-23 02:28:47 +04:00			`default n`
PCI: add PCI Express ASPM support PCI Express ASPM defines a protocol for PCI Express components in the D0 state to reduce Link power by placing their Links into a low power state and instructing the other end of the Link to do likewise. This capability allows hardware-autonomous, dynamic Link power reduction beyond what is achievable by software-only controlled power management. However, The device should be configured by software appropriately. Enabling ASPM will save power, but will introduce device latency. This patch adds ASPM support in Linux. It introduces a global policy for ASPM, a sysfs file /sys/module/pcie_aspm/parameters/policy can control it. The interface can be used as a boot option too. Currently we have below setting: -default, BIOS default setting -powersave, highest power saving mode, enable all available ASPM state and clock power management -performance, highest performance, disable ASPM and clock power management By default, the 'default' policy is used currently. In my test, power difference between powersave mode and performance mode is about 1.3w in a system with 3 PCIE links. Note: some devices might not work well with aspm, either because chipset issue or device issue. The patch provide API (pci_disable_link_state), driver can disable ASPM for specific device. Signed-off-by: Shaohua Li <shaohua.li@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> 2008-02-25 04:46:41 +03:00			`help`
			`This enables PCI Express ASPM (Active State Power Management) and`
			`Clock Power Management. ASPM supports state L0/L0s/L1.`

			`When in doubt, say N.`
			`config PCIEASPM_DEBUG`
			`bool "Debug PCI Express ASPM"`
			`depends on PCIEASPM`
			`default n`
			`help`
			`This enables PCI Express ASPM debug support. It will add per-device`
			`interface to control ASPM.`