diff options
| 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 /drivers/pci/pci-sysfs.c | |
| parent | 687aaf386aeb551130f31705ce40d1341047a936 (diff) | |
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 'drivers/pci/pci-sysfs.c')
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index 793412954529..0e76c02e0b7d 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -1588,6 +1588,9 @@ static const struct attribute_group *pci_dev_attr_groups[] = { #ifdef CONFIG_PCIEAER &aer_stats_attr_group, #endif +#ifdef CONFIG_PCIEASPM + &aspm_ctrl_attr_group, +#endif NULL, }; |