one-dev-per-hb.rst

  1.. SPDX-License-Identifier: GPL-2.0
  2
  3==========================
  4One Device per Host Bridge
  5==========================
  6
  7This system has a single socket with two CXL host bridges. Each host bridge
  8has a single CXL memory expander with a 4GB of memory.
  9
 10Things to note:
 11
 12* Cross-Bridge interleave is not being used.
 13* The expanders are in two separate but adjacent memory regions.
 14* This CEDT/SRAT describes one node per device
 15* The expanders have the same performance and will be in the same memory tier.
 16
 17:doc:`CEDT <../acpi/cedt>`::
 18
 19            Subtable Type : 00 [CXL Host Bridge Structure]
 20                 Reserved : 00
 21                   Length : 0020
 22   Associated host bridge : 00000007
 23    Specification version : 00000001
 24                 Reserved : 00000000
 25            Register base : 0000010370400000
 26          Register length : 0000000000010000
 27
 28            Subtable Type : 00 [CXL Host Bridge Structure]
 29                 Reserved : 00
 30                   Length : 0020
 31   Associated host bridge : 00000006
 32    Specification version : 00000001
 33                 Reserved : 00000000
 34            Register base : 0000010380800000
 35          Register length : 0000000000010000
 36
 37            Subtable Type : 01 [CXL Fixed Memory Window Structure]
 38                 Reserved : 00
 39                   Length : 002C
 40                 Reserved : 00000000
 41      Window base address : 0000001000000000
 42              Window size : 0000000100000000
 43 Interleave Members (2^n) : 00
 44    Interleave Arithmetic : 00
 45                 Reserved : 0000
 46              Granularity : 00000000
 47             Restrictions : 0006
 48                    QtgId : 0001
 49             First Target : 00000007
 50
 51            Subtable Type : 01 [CXL Fixed Memory Window Structure]
 52                 Reserved : 00
 53                   Length : 002C
 54                 Reserved : 00000000
 55      Window base address : 0000001100000000
 56              Window size : 0000000100000000
 57 Interleave Members (2^n) : 00
 58    Interleave Arithmetic : 00
 59                 Reserved : 0000
 60              Granularity : 00000000
 61             Restrictions : 0006
 62                    QtgId : 0001
 63             First Target : 00000006
 64
 65:doc:`SRAT <../acpi/srat>`::
 66
 67         Subtable Type : 01 [Memory Affinity]
 68                Length : 28
 69      Proximity Domain : 00000001
 70             Reserved1 : 0000
 71          Base Address : 0000001000000000
 72        Address Length : 0000000100000000
 73             Reserved2 : 00000000
 74 Flags (decoded below) : 0000000B
 75             Enabled : 1
 76       Hot Pluggable : 1
 77        Non-Volatile : 0
 78
 79         Subtable Type : 01 [Memory Affinity]
 80                Length : 28
 81      Proximity Domain : 00000002
 82             Reserved1 : 0000
 83          Base Address : 0000001100000000
 84        Address Length : 0000000100000000
 85             Reserved2 : 00000000
 86 Flags (decoded below) : 0000000B
 87             Enabled : 1
 88       Hot Pluggable : 1
 89        Non-Volatile : 0
 90
 91:doc:`HMAT <../acpi/hmat>`::
 92
 93               Structure Type : 0001 [SLLBI]
 94                    Data Type : 00   [Latency]
 95 Target Proximity Domain List : 00000000
 96 Target Proximity Domain List : 00000001
 97 Target Proximity Domain List : 00000002
 98                        Entry : 0080
 99                        Entry : 0100
100                        Entry : 0100
101
102               Structure Type : 0001 [SLLBI]
103                    Data Type : 03   [Bandwidth]
104 Target Proximity Domain List : 00000000
105 Target Proximity Domain List : 00000001
106 Target Proximity Domain List : 00000002
107                        Entry : 1200
108                        Entry : 0200
109                        Entry : 0200
110
111:doc:`SLIT <../acpi/slit>`::
112
113     Signature : "SLIT"    [System Locality Information Table]
114    Localities : 0000000000000003
115  Locality   0 : 10 20 20
116  Locality   1 : FF 0A FF
117  Locality   2 : FF FF 0A
118
119:doc:`DSDT <../acpi/dsdt>`::
120
121  Scope (_SB)
122  {
123    Device (S0D0)
124    {
125        Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
126        ...
127        Name (_UID, 0x07)  // _UID: Unique ID
128    }
129    ...
130    Device (S0D5)
131    {
132        Name (_HID, "ACPI0016" /* Compute Express Link Host Bridge */)  // _HID: Hardware ID
133        ...
134        Name (_UID, 0x06)  // _UID: Unique ID
135    }
136  }