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| author |  Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>
| 2023-06-09 19:06:14 +0200 |
|---|---|---|
| committer |  Herbert Xu <herbert@gondor.apana.org.au>
| 2023-06-16 20:30:57 +0800 |
| commit | 2382b5ae80467cb61339db130a07e5075ebb270d (patch) | |
| tree | fae8972f333c6f8667ca65c5a48f56f146884c07 /Documentation/ABI | |
| parent | crypto: qat - extend configuration for 4xxx (diff) | |
| download | linux-2382b5ae80467cb61339db130a07e5075ebb270d.tar.gz linux-2382b5ae80467cb61339db130a07e5075ebb270d.tar.bz2 linux-2382b5ae80467cb61339db130a07e5075ebb270d.zip | |
crypto: qat - expose pm_idle_enabled through sysfs
Expose 'pm_idle_enabled' sysfs attribute. This attribute controls how
idle conditions are handled. If it is set to 1 (idle support enabled)
when the device detects an idle condition, the driver will transition
the device to the 'MIN' power configuration.
In order to set the value of this attribute for a device, the device
must be in the 'down' state.
This only applies to qat_4xxx generation.
Signed-off-by: Lucas Segarra Fernandez <lucas.segarra.fernandez@intel.com>
Reviewed-by: Giovanni Cabiddu <giovanni.cabiddu@intel.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'Documentation/ABI')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-driver-qat | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-driver-qat b/Documentation/ABI/testing/sysfs-driver-qat index e6d427c41bee..ef6d6c57105e 100644 --- a/Documentation/ABI/testing/sysfs-driver-qat +++ b/Documentation/ABI/testing/sysfs-driver-qat @@ -58,3 +58,38 @@ Description: (RW) Reports the current configuration of the QAT device. dc This attribute is only available for qat_4xxx devices. + +What: /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled +Date: June 2023 +KernelVersion: 6.5 +Contact: qat-linux@intel.com +Description: (RW) This configuration option provides a way to force the device into remaining in + the MAX power state. + If idle support is enabled the device will transition to the `MIN` power state when + idle, otherwise will stay in the MAX power state. + Write to the file to enable or disable idle support. + + The values are: + + * 0: idle support is disabled + * 1: idle support is enabled + + Default value is 1. + + It is possible to set the pm_idle_enabled value only if the device + is in the `down` state (see /sys/bus/pci/devices/<BDF>/qat/state) + + The following example shows how to change the pm_idle_enabled of + a device:: + + # cat /sys/bus/pci/devices/<BDF>/qat/state + up + # cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled + 1 + # echo down > /sys/bus/pci/devices/<BDF>/qat/state + # echo 0 > /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled + # echo up > /sys/bus/pci/devices/<BDF>/qat/state + # cat /sys/bus/pci/devices/<BDF>/qat/pm_idle_enabled + 0 + + This attribute is only available for qat_4xxx devices. |