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Flexible Presentation

Documentation/driver-api/cxl/platform/example-configurations/flexible.rst

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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 } }