Documentation/driver-api/cxl/platform/acpi/dsdt.rst


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28

.. SPDX-License-Identifier: GPL-2.0

==============================================
DSDT - Differentiated system Description Table
==============================================

This table describes what peripherals a machine has.

This table's UIDs for CXL devices - specifically host bridges, must be
consistent with the contents of the CEDT, otherwise the CXL driver will
fail to probe correctly.

Example Compute Express Link Host Bridge ::

    Scope (_SB)
    {
        Device (S0D0)
        {
            Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
            Name (_CID, Package (0x02)  // _CID: Compatible ID
            {
                EisaId ("PNP0A08") /* PCI Express Bus */,
                EisaId ("PNP0A03") /* PCI Bus */
            })
            ...
            Name (_UID, 0x05)  // _UID: Unique ID
            ...
      }