hb-interleave.rst

  1.. SPDX-License-Identifier: GPL-2.0
  2
  3============================
  4Cross-Host-Bridge Interleave
  5============================
  6This system has a single socket with two CXL host bridges. Each host bridge
  7has a single CXL memory expander with a 4GB of memory.
  8
  9Things to note:
 10
 11* Cross-Bridge interleave is described.
 12* The expanders are described by a single CFMWS.
 13* This SRAT describes one node for both host bridges.
 14* The HMAT describes a single node's performance.
 15
 16:doc:`CEDT <../acpi/cedt>`::
 17
 18            Subtable Type : 00 [CXL Host Bridge Structure]
 19                 Reserved : 00
 20                   Length : 0020
 21   Associated host bridge : 00000007
 22    Specification version : 00000001
 23                 Reserved : 00000000
 24            Register base : 0000010370400000
 25          Register length : 0000000000010000
 26
 27            Subtable Type : 00 [CXL Host Bridge Structure]
 28                 Reserved : 00
 29                   Length : 0020
 30   Associated host bridge : 00000006
 31    Specification version : 00000001
 32                 Reserved : 00000000
 33            Register base : 0000010380800000
 34          Register length : 0000000000010000
 35
 36            Subtable Type : 01 [CXL Fixed Memory Window Structure]
 37                 Reserved : 00
 38                   Length : 002C
 39                 Reserved : 00000000
 40      Window base address : 0000001000000000
 41              Window size : 0000000200000000
 42 Interleave Members (2^n) : 01
 43    Interleave Arithmetic : 00
 44                 Reserved : 0000
 45              Granularity : 00000000
 46             Restrictions : 0006
 47                    QtgId : 0001
 48             First Target : 00000007
 49            Second Target : 00000006
 50
 51:doc:`SRAT <../acpi/srat>`::
 52
 53         Subtable Type : 01 [Memory Affinity]
 54                Length : 28
 55      Proximity Domain : 00000001
 56             Reserved1 : 0000
 57          Base Address : 0000001000000000
 58        Address Length : 0000000200000000
 59             Reserved2 : 00000000
 60 Flags (decoded below) : 0000000B
 61             Enabled : 1
 62       Hot Pluggable : 1
 63        Non-Volatile : 0
 64
 65:doc:`HMAT <../acpi/hmat>`::
 66
 67               Structure Type : 0001 [SLLBI]
 68                    Data Type : 00   [Latency]
 69 Target Proximity Domain List : 00000000
 70 Target Proximity Domain List : 00000001
 71 Target Proximity Domain List : 00000002
 72                        Entry : 0080
 73                        Entry : 0100
 74
 75               Structure Type : 0001 [SLLBI]
 76                    Data Type : 03   [Bandwidth]
 77 Target Proximity Domain List : 00000000
 78 Target Proximity Domain List : 00000001
 79 Target Proximity Domain List : 00000002
 80                        Entry : 1200
 81                        Entry : 0400
 82
 83:doc:`SLIT <../acpi/slit>`::
 84
 85     Signature : "SLIT"    [System Locality Information Table]
 86    Localities : 0000000000000003
 87  Locality   0 : 10 20
 88  Locality   1 : FF 0A
 89
 90:doc:`DSDT <../acpi/dsdt>`::
 91
 92  Scope (_SB)
 93  {
 94    Device (S0D0)
 95    {
 96        Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
 97        ...
 98        Name (_UID, 0x07)  // _UID: Unique ID
 99    }
100    ...
101    Device (S0D5)
102    {
103        Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
104        ...
105        Name (_UID, 0x06)  // _UID: Unique ID
106    }
107  }