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authorHeikki Krogerus <heikki.krogerus@linux.intel.com>2021-12-23 11:16:17 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2021-12-30 14:13:03 +0300
commit882c982dada4d53079c56de94ccbce1e21cc675f (patch)
treea7cb441f7f9b3a71bd3a1049e49ecd13495e2091 /include/acpi
parent13068b7472f9720f807fe72b9bf3f76b9fd6d6ab (diff)
downloadlinux-882c982dada4d53079c56de94ccbce1e21cc675f.tar.xz
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.h1
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;