Based on kernel version 6.16. Page generated on 2025-08-06 08:57 EST.
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.. SPDX-License-Identifier: GPL-2.0
=====================
Flexible Presentation
=====================
This system has a single socket with two CXL host bridges. Each host bridge
has two CXL memory expanders with a 4GB of memory (32GB total).
On this system, the platform designer wanted to provide the user flexibility
to configure the memory devices in various interleave or NUMA node
configurations. So they provided every combination.
Things to note:
* Cross-Bridge interleave is described in one CFMWS that covers all capacity.
* One CFMWS is also described per-host bridge.
* One CFMWS is also described per-device.
* This SRAT describes one node for each of the above CFMWS.
* The HMAT describes performance for each node in the SRAT.
: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 : 00 [CXL Host Bridge Structure]
Reserved : 00
Length : 0020
Associated host bridge : 00000006
Specification version : 00000001
Reserved : 00000000
Register base : 0000010380800000
Register length : 0000000000010000
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000001000000000
Window size : 0000000400000000
Interleave Members (2^n) : 01
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000007
Second Target : 00000006
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000002000000000
Window size : 0000000200000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000007
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000002200000000
Window size : 0000000200000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000006
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000003000000000
Window size : 0000000100000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000007
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000003100000000
Window size : 0000000100000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000007
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000003200000000
Window size : 0000000100000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000006
Subtable Type : 01 [CXL Fixed Memory Window Structure]
Reserved : 00
Length : 002C
Reserved : 00000000
Window base address : 0000003300000000
Window size : 0000000100000000
Interleave Members (2^n) : 00
Interleave Arithmetic : 00
Reserved : 0000
Granularity : 00000000
Restrictions : 0006
QtgId : 0001
First Target : 00000006
:doc:`SRAT <../acpi/srat>`::
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000001
Reserved1 : 0000
Base Address : 0000001000000000
Address Length : 0000000400000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000002
Reserved1 : 0000
Base Address : 0000002000000000
Address Length : 0000000200000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000003
Reserved1 : 0000
Base Address : 0000002200000000
Address Length : 0000000200000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000004
Reserved1 : 0000
Base Address : 0000003000000000
Address Length : 0000000100000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000005
Reserved1 : 0000
Base Address : 0000003100000000
Address Length : 0000000100000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000006
Reserved1 : 0000
Base Address : 0000003200000000
Address Length : 0000000100000000
Reserved2 : 00000000
Flags (decoded below) : 0000000B
Enabled : 1
Hot Pluggable : 1
Non-Volatile : 0
Subtable Type : 01 [Memory Affinity]
Length : 28
Proximity Domain : 00000007
Reserved1 : 0000
Base Address : 0000003300000000
Address Length : 0000000100000000
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
Target Proximity Domain List : 00000002
Target Proximity Domain List : 00000003
Target Proximity Domain List : 00000004
Target Proximity Domain List : 00000005
Target Proximity Domain List : 00000006
Target Proximity Domain List : 00000007
Entry : 0080
Entry : 0100
Entry : 0100
Entry : 0100
Entry : 0100
Entry : 0100
Entry : 0100
Entry : 0100
Structure Type : 0001 [SLLBI]
Data Type : 03 [Bandwidth]
Target Proximity Domain List : 00000000
Target Proximity Domain List : 00000001
Target Proximity Domain List : 00000002
Target Proximity Domain List : 00000003
Target Proximity Domain List : 00000004
Target Proximity Domain List : 00000005
Target Proximity Domain List : 00000006
Target Proximity Domain List : 00000007
Entry : 1200
Entry : 0400
Entry : 0200
Entry : 0200
Entry : 0100
Entry : 0100
Entry : 0100
Entry : 0100
:doc:`SLIT <../acpi/slit>`::
Signature : "SLIT" [System Locality Information Table]
Localities : 0000000000000003
Locality 0 : 10 20 20 20 20 20 20 20
Locality 1 : FF 0A FF FF FF FF FF FF
Locality 2 : FF FF 0A FF FF FF FF FF
Locality 3 : FF FF FF 0A FF FF FF FF
Locality 4 : FF FF FF FF 0A FF FF FF
Locality 5 : FF FF FF FF FF 0A FF FF
Locality 6 : FF FF FF FF FF FF 0A FF
Locality 7 : FF FF FF FF FF FF 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
}
...
Device (S0D5)
{
Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */) // _HID: Hardware ID
...
Name (_UID, 0x06) // _UID: Unique ID
}
}
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