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.. SPDX-License-Identifier: GPL-2.0
================================
Multiple Devices per Host Bridge
================================
In this example system we will have a single socket and one CXL host bridge.
There are two CXL memory expanders with 4GB attached to the host bridge.
Things to note:
* Intra-Bridge interleave is not described here.
* The expanders are described by a single CEDT/CFMWS.
* This CEDT/SRAT describes one node for both devices.
* There is only one proximity domain the HMAT for both devices.
:doc:`CEDT <../acpi/cedt>`::
Subtable Type : 00 [CXL Host Bridge Structure]
Reserved : 00
Length : 0020
Associated host bridge : 00000007
Specification version : 00000001
Reserved : 00000000
Register base : 0000010370400000
Register length : 0000000000010000
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000001000000000
Window size : 0000000200000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000007
:doc:`SRAT <../acpi/srat>`::
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000001
Reserved1 : 0000
Base Address : 0000001000000000
Address Length : 0000000200000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
:doc:`HMAT <../acpi/hmat>`::
Structure Type : 0001 [SLLBI]
Data Type : 00 [Latency]
Target Proximity Domain List : 00000000
Target Proximity Domain List : 00000001
Entry : 0080
Entry : 0100
Structure Type : 0001 [SLLBI]
Data Type : 03 [Bandwidth]
Target Proximity Domain List : 00000000
Target Proximity Domain List : 00000001
Entry : 1200
Entry : 0200
:doc:`SLIT <../acpi/slit>`::
Signature : "SLIT" [System Locality Information Table]
Localities : 0000000000000003
Locality 0 : 10 20
Locality 1 : FF 0A
:doc:`DSDT <../acpi/dsdt>`::
Scope (_SB)
{
Device (S0D0)
{
Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */) // _HID: Hardware ID
...
Name (_UID, 0x07) // _UID: Unique ID
}
...
}
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