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ACPI: add support for loading SSDTs via configfs

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New tables can be loaded by creating directories under /config/table/
and writing the AML code into the aml table attribute. Various table
attributes will be readable once the table is successfully loaded.

Unloading tables is not supported at the moment, but it can be easily
implemented once ACPI loading functions provide a table handle to be
used for unloading.

Signed-off-by: Octavian Purdila <[email protected]>
Reviewed-by: Mika Westerberg <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
This commit is contained in:
Octavian Purdila 2016-07-08 19:13:14 +03:00 • committed by Rafael J. Wysocki
commit 612bd01fc6
3 changed files with 258 additions and 1 deletions
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14
Documentation/acpi/ssdt-overlays.txt
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@ -156,3 +156,17 @@ tmp=$(mktemp)
/bin/echo -ne "\007\000\000\000" | cat - $filename > $tmp
dd if=$tmp of="$EFIVARFS/$name-$guid" bs=$(stat -c %s $tmp)
rm $tmp
== Loading ACPI SSDTs from configfs ==
This option allows loading of user defined SSDTs from userspace via the configfs
interface. The CONFIG_ACPI_CONFIGFS option must be select and configfs must be
mounted. In the following examples, we assume that configfs has been mounted in
/config.
New tables can be loading by creating new directories in /config/acpi/table/ and
writing the SSDT aml code in the aml attribute:
cd /config/acpi/table
mkdir my_ssdt
cat ~/ssdt.aml > my_ssdt/aml