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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2019-10-05 14:07:56 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2019-11-21 17:30:24 -0600 |
| commit | 72ea91afbfb08619696ccde610ee4d0d29cf4a1d (patch) | |
| tree | 54d530dc35b7d7176c349fbe1fb8e19e67f230be /Documentation | |
| parent | 687aaf386aeb551130f31705ce40d1341047a936 (diff) | |
| download | linux-72ea91afbfb08619696ccde610ee4d0d29cf4a1d.tar.bz2 | |
PCI/ASPM: Add sysfs attributes for controlling ASPM link states
Add sysfs attributes to Endpoints and other Upstream Ports to control ASPM,
Clock PM, and L1 PM Substates. The new attributes are:
/sys/devices/pci*/.../link/clkpm
/sys/devices/pci*/.../link/l0s_aspm
/sys/devices/pci*/.../link/l1_aspm
/sys/devices/pci*/.../link/l1_1_aspm
/sys/devices/pci*/.../link/l1_2_aspm
/sys/devices/pci*/.../link/l1_1_pcipm
/sys/devices/pci*/.../link/l1_2_pcipm
An attribute is only visible if both ends of the Link leading to the device
support the state. Writing y/1/on to the file enables the state; n/0/off
disables it.
These attributes can be used to tune the power/performance tradeoff for
individual devices.
[bhelgaas: commit log, rename directory to "link"]
Link: https://lore.kernel.org/r/b1c83f8a-9bf6-eac5-82d0-cf5b90128fbf@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 8bfee557e50e..450296cc7948 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -347,3 +347,16 @@ Description: If the device has any Peer-to-Peer memory registered, this file contains a '1' if the memory has been published for use outside the driver that owns the device. + +What: /sys/bus/pci/devices/.../link/clkpm + /sys/bus/pci/devices/.../link/l0s_aspm + /sys/bus/pci/devices/.../link/l1_aspm + /sys/bus/pci/devices/.../link/l1_1_aspm + /sys/bus/pci/devices/.../link/l1_2_aspm + /sys/bus/pci/devices/.../link/l1_1_pcipm + /sys/bus/pci/devices/.../link/l1_2_pcipm +Date: October 2019 +Contact: Heiner Kallweit <hkallweit1@gmail.com> +Description: If ASPM is supported for an endpoint, these files can be + used to disable or enable the individual power management + states. Write y/1/on to enable, n/0/off to disable. |