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| author | Mark Pearson <mpearson-lenovo@squebb.ca> | 2023-09-19 10:15:26 -0400 |
|---|---|---|
| committer | Hans de Goede <hdegoede@redhat.com> | 2023-09-21 18:29:29 +0200 |
| commit | 318d97849fc2cb45b2238fdb9eaa714b5d669df5 (patch) | |
| tree | 43965991559842dd9f5f30e551232d7ab975c179 /Documentation/ABI/testing | |
| parent | 423c3361855c1e81f1cb91728a2ac5ddfd2cbf16 (diff) | |
| download | linux-318d97849fc2cb45b2238fdb9eaa714b5d669df5.tar.gz | |
platform/x86: think-lmi: Add bulk save feature
On Lenovo platforms there is a limitation in the number of times an
attribute can be saved. This is an architectural limitation and it limits
the number of attributes that can be modified to 48.
A solution for this is instead of the attribute being saved after every
modification allow a user to bulk set the attributes and then trigger a
final save. This allows unlimited attributes.
This patch introduces a save_settings attribute that can be configured to
either single or bulk mode by the user.
Single mode is the default but customers who want to avoid the 48
attribute limit can enable bulk mode.
Displaying the save_settings attribute will display the enabled mode.
When in bulk mode writing 'save' to the save_settings attribute will
trigger a save. Once this has been done a reboot is required before more
attributes can be modified.
Signed-off-by: Mark Pearson <mpearson-lenovo@squebb.ca>
Link: https://lore.kernel.org/r/20230919141530.4805-1-mpearson-lenovo@squebb.ca
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Diffstat (limited to 'Documentation/ABI/testing')
| -rw-r--r-- | Documentation/ABI/testing/sysfs-class-firmware-attributes | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/Documentation/ABI/testing/sysfs-class-firmware-attributes b/Documentation/ABI/testing/sysfs-class-firmware-attributes index f205d39409a339..9c82c7b42ff823 100644 --- a/Documentation/ABI/testing/sysfs-class-firmware-attributes +++ b/Documentation/ABI/testing/sysfs-class-firmware-attributes @@ -383,6 +383,36 @@ Description: Note that any changes to this attribute requires a reboot for changes to take effect. +What: /sys/class/firmware-attributes/*/attributes/save_settings +Date: August 2023 +KernelVersion: 6.6 +Contact: Mark Pearson <mpearson-lenovo@squebb.ca> +Description: + On Lenovo platforms there is a limitation in the number of times an attribute can be + saved. This is an architectural limitation and it limits the number of attributes + that can be modified to 48. + A solution for this is instead of the attribute being saved after every modification, + to allow a user to bulk set the attributes, and then trigger a final save. This allows + unlimited attributes. + + Read the attribute to check what save mode is enabled (single or bulk). + E.g: + # cat /sys/class/firmware-attributes/thinklmi/attributes/save_settings + single + + Write the attribute with 'bulk' to enable bulk save mode. + Write the attribute with 'single' to enable saving, after every attribute set. + The default setting is single mode. + E.g: + # echo bulk > /sys/class/firmware-attributes/thinklmi/attributes/save_settings + + When in bulk mode write 'save' to trigger a save of all currently modified attributes. + Note, once a save has been triggered, in bulk mode, attributes can no longer be set and + will return a permissions error. This is to prevent users hitting the 48+ save limitation + (which requires entering the BIOS to clear the error condition) + E.g: + # echo save > /sys/class/firmware-attributes/thinklmi/attributes/save_settings + What: /sys/class/firmware-attributes/*/attributes/debug_cmd Date: July 2021 KernelVersion: 5.14 |