diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci | 9 | ||||
| -rw-r--r-- | drivers/pci/pci-sysfs.c | 10 |
2 files changed, 19 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci index 77ad9ec3c801..25c9c39770c6 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci +++ b/Documentation/ABI/testing/sysfs-bus-pci @@ -366,3 +366,12 @@ 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. + +What: /sys/bus/pci/devices/.../power_state +Date: November 2020 +Contact: Linux PCI developers <linux-pci@vger.kernel.org> +Description: + This file contains the current PCI power state of the device. + The value comes from the PCI kernel device state and can be one + of: "unknown", "error", "D0", D1", "D2", "D3hot", "D3cold". + The file is read only. diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c index d15c881e2e7e..fb072f4b3176 100644 --- a/drivers/pci/pci-sysfs.c +++ b/drivers/pci/pci-sysfs.c @@ -124,6 +124,15 @@ static ssize_t cpulistaffinity_show(struct device *dev, } static DEVICE_ATTR_RO(cpulistaffinity); +static ssize_t power_state_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pci_dev *pdev = to_pci_dev(dev); + + return sprintf(buf, "%s\n", pci_power_name(pdev->current_state)); +} +static DEVICE_ATTR_RO(power_state); + /* show resources */ static ssize_t resource_show(struct device *dev, struct device_attribute *attr, char *buf) @@ -581,6 +590,7 @@ static ssize_t driver_override_show(struct device *dev, static DEVICE_ATTR_RW(driver_override); static struct attribute *pci_dev_attrs[] = { + &dev_attr_power_state.attr, &dev_attr_resource.attr, &dev_attr_vendor.attr, &dev_attr_device.attr, |