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ACPI / property: Allow multiple property compatible _DSD entries

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It is possible to have _DSD entries where the data is compatible with
device properties format but are using different GUID for various reasons.
In addition to that there can be many such _DSD entries for a single device
such as for PCIe root port used to host a Thunderbolt hierarchy:

    Scope (\_SB.PCI0.RP21)
    {
        Name (_DSD, Package () {
            ToUUID ("6211e2c0-58a3-4af3-90e1-927a4e0c55a4"),
            Package () {
                Package () {"HotPlugSupportInD3", 1}
            },

            ToUUID ("efcc06cc-73ac-4bc3-bff0-76143807c389"),
            Package () {
                Package () {"ExternalFacingPort", 1},
                Package () {"UID", 0 }
            }
        })
    }

More information about these new _DSD entries can be found in:

  https://docs.microsoft.com/en-us/windows-hardware/drivers/pci/dsd-for-pcie-root-ports

To make these available for drivers via unified device property APIs,
modify ACPI property core so that it supports multiple _DSD entries
organized in a linked list. We also store GUID of each _DSD entry in struct
acpi_device_properties in case there is need to differentiate between
entries. The supported GUIDs are then listed in prp_guids array.

Signed-off-by: Mika Westerberg <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
Reviewed-by: Rafael J. Wysocki <[email protected]>
Acked-by: Sakari Ailus <[email protected]>
This commit is contained in:
Mika Westerberg 2018-09-27 16:57:05 -05:00 • committed by Bjorn Helgaas
commit 5f5e4890d5
5 changed files with 86 additions and 29 deletions
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8
include/acpi/acpi_bus.h
View file

@ -346,10 +346,16 @@ struct acpi_device_physical_node {
bool put_online:1;
};
struct acpi_device_properties {
const guid_t *guid;
const union acpi_object *properties;
struct list_head list;
};
/* ACPI Device Specific Data (_DSD) */
struct acpi_device_data {
const union acpi_object *pointer;
const union acpi_object *properties;
struct list_head properties;
const union acpi_object *of_compatible;
struct list_head subnodes;
};