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| author | Heikki Krogerus <heikki.krogerus@linux.intel.com> | 2021-12-23 09:16:17 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-12-30 12:13:03 +0100 |
| commit | 882c982dada4d53079c56de94ccbce1e21cc675f (patch) | |
| tree | a7cb441f7f9b3a71bd3a1049e49ecd13495e2091 /include/acpi | |
| parent | acpi: Export acpi_bus_type (diff) | |
| download | linux-882c982dada4d53079c56de94ccbce1e21cc675f.tar.xz linux-882c982dada4d53079c56de94ccbce1e21cc675f.zip | |
acpi: Store CRC-32 hash of the _PLD in struct acpi_device
Storing CRC-32 hash of the Physical Location of Device
object (_PLD) with devices that have it. The hash is stored
to a new struct acpi_device member "pld_crc".
The hash makes it easier to find devices that share a
location, as there is no need to evaluate the entire object
every time. Knowledge about devices that share a location
can be used in device drivers that need to know the
connections to other components inside a system. USB3 ports
will for example always share their location with a USB2
port.
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Link: https://lore.kernel.org/r/20211223081620.45479-3-heikki.krogerus@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/acpi')
| -rw-r--r-- | include/acpi/acpi_bus.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h index 480f9207a4c6..3a1280649ddf 100644 --- a/include/acpi/acpi_bus.h +++ b/include/acpi/acpi_bus.h @@ -358,6 +358,7 @@ struct acpi_gpio_mapping; /* Device */ struct acpi_device { + u32 pld_crc; int device_type; acpi_handle handle; /* no handle for fixed hardware */ struct fwnode_handle fwnode; |