NAME
NAME
cxl-list - List platform CXL objects, and their attributes, in json.
SYNOPSIS
cxl list [<options>]
Walk the CXL capable device hierarchy in the system and list all device instances along with some of their major attributes.
Options can be specified to limit the output to specific objects. When a single object type is specified the return json object is an array of just those objects, when multiple objects types are specified the returned object may be an array of arrays with the inner array named for the given object type. The top-level arrays are elided when the objects can nest under a higher object-type in the hierarchy. The potential top-level array names and their nesting properties are:
“anon memdevs”
(disabled memory devices) do not nest
“buses”
do not nest
“ports”
nest under buses
“endpoints”
nest under ports or buses (if ports are not emitted)
“memdevs”
nest under endpoints or ports (if endpoints are not emitted) or buses
(if endpoints and ports are not emitted)
“root decoders”
nest under buses
“port decoders”
nest under ports, or buses (if ports are not emitted)
“endpoint decoders”
nest under endpoints, or ports (if endpoints are not emitted) or buses
(if endpoints and ports are not emitted)
Filters can be specified as either a single identifier, a space separated quoted string, or a comma separated list. When multiple filter identifiers are specified within a filter string, like “-m mem0,mem1,mem2”, they are combined as an OR filter. When multiple filter string types are specified, like “-m mem0,mem1,mem2 -p port10”, they are combined as an AND filter. So, “-m mem0,mem1,mem2 -p port10” would only list objects that are beneath port10 AND map mem0, mem1, OR mem2.
Given that many topology queries seek to answer questions relative to a given memdev, buses, ports, endpoints, and decoders can be filtered by one or more memdevs. For example:
# cxl list -P -p switch,endpoint -m mem0
[
{
"port":"port1",
"host":"ACPI0016:00",
"endpoints:port1":[
{
"endpoint":"endpoint2",
"host":"mem0"
}
]
}
]
Additionally, when provisioning new interleave configurations it is useful to know which memdevs can be referenced by a given decoder like a root decoder, or mapped by a given port if the decoders are not configured.
# cxl list -Mu -d decoder0.0
{
"memdev":"mem0",
"pmem_size":"256.00 MiB (268.44 MB)",
"serial":"0",
"host":"0000:35:00.0"
}
Note that for the -m/–memdev=, -p/–port=, and -e/–endpoint= filters a host device name can be substituted for the CXL object identifier. For -m/–memdev= this is an endpoint PCI device name of the form “DDDD:bb:dd.f” (D: Domain b: Bus d: Device f: Function) (see /sys/bus/pci/devices), for -p/–port= this is an upstream switch port PCI device name of the form “DDDD:bb:dd.f”, or a PCI bus name of the form “pciDDDD:bb”, and for -e/–endpoint= the host device is CXL memory device object name of the form “memX”.
The –human option in addition to reformatting some fields to more human friendly strings also unwraps the array to reduce the number of lines of output.
EXAMPLE
# cxl list --memdevs
[
{
"memdev":"mem0",
"pmem_size":268435456,
"serial":0,
"host":"0000:35:00.0"
}
]
# cxl list -BMu
[
{
"anon memdevs":[
{
"memdev":"mem0",
"pmem_size":"256.00 MiB (268.44 MB)",
"serial":"0"
}
]
},
{
"buses":[
{
"bus":"root0",
"provider":"ACPI.CXL"
}
]
}
]
OPTIONS
-m; --memdev=
Specify CXL memory device name(s) (“mem0”), device id(s) (“0”), and/or
host device name(s) (“0000:35:00.0”) to filter the listing. For example:
# cxl list -M --memdev="0 mem3 5"
[
{
"memdev":"mem0",
"pmem_size":268435456,
"serial":0
},
{
"memdev":"mem3",
"pmem_size":268435456,
"ram_size":268435456,
"serial":2
},
{
"memdev":"mem5",
"pmem_size":268435456,
"ram_size":268435456,
"serial":4
}
]
-s; --serial=
Specify CXL memory device serial number(s) to filter the listing
-M; --memdevs
Include CXL memory devices in the listing
-i; --idle
Include idle (not enabled / zero-sized) devices in the listing
-H; --health
Include health information in the memdev listing. Example listing:
# cxl list -m mem0 -H
[
{
"memdev":"mem0",
"pmem_size":268435456,
"ram_size":268435456,
"health":{
"maintenance_needed":true,
"performance_degraded":true,
"hw_replacement_needed":true,
"media_normal":false,
"media_not_ready":false,
"media_persistence_lost":false,
"media_data_lost":true,
"media_powerloss_persistence_loss":false,
"media_shutdown_persistence_loss":false,
"media_persistence_loss_imminent":false,
"media_powerloss_data_loss":false,
"media_shutdown_data_loss":false,
"media_data_loss_imminent":false,
"ext_life_used":"normal",
"ext_temperature":"critical",
"ext_corrected_volatile":"warning",
"ext_corrected_persistent":"normal",
"life_used_percent":15,
"temperature":25,
"dirty_shutdowns":10,
"volatile_errors":20,
"pmem_errors":30
}
}
]
-I; --partition
Include partition information in the memdev listing. Example listing:
# cxl list -m mem0 -I
[
{
"memdev":"mem0",
"ram_size":273535729664,
"partition_info":{
"total_size":273535729664,
"volatile_only_size":0,
"persistent_only_size":0,
"partition_alignment_size":268435456
"active_volatile_size":273535729664,
"active_persistent_size":0,
"next_volatile_size":0,
"next_persistent_size":0,
}
}
]
-A; --alert-config
Include alert configuration in the memdev listing. Example listing:
# cxl list -m mem0 -A
[
{
"memdev":"mem0",
"pmem_size":0,
"ram_size":273535729664,
"alert_config":{
"life_used_prog_warn_threshold_valid":false,
"dev_over_temperature_prog_warn_threshold_valid":false,
"dev_under_temperature_prog_warn_threshold_valid":false,
"corrected_volatile_mem_err_prog_warn_threshold_valid":true,
"corrected_pmem_err_prog_warn_threshold_valid":false,
"life_used_prog_warn_threshold_writable":false,
"dev_over_temperature_prog_warn_threshold_writable":false,
"dev_under_temperature_prog_warn_threshold_writable":false,
"corrected_volatile_mem_err_prog_warn_threshold_writable":true,
"corrected_pmem_err_prog_warn_threshold_writable":false,
"life_used_crit_alert_threshold":0,
"life_used_prog_warn_threshold":0,
"dev_over_temperature_crit_alert_threshold":0,
"dev_under_temperature_crit_alert_threshold":0,
"dev_over_temperature_prog_warn_threshold":0,
"dev_under_temperature_prog_warn_threshold":0,
"corrected_volatile_mem_err_prog_warn_threshold":0,
"corrected_pmem_err_prog_warn_threshold":0
},
}
]
-B; --buses
Include bus / CXL root object(s) in the listing. Typically, on ACPI
systems the bus object is a singleton associated with the ACPI0017
device, but there are test scenarios where there may be multiple CXL
memory hierarchies.
# cxl list -B
[
{
"bus":"root3",
"provider":"cxl_test"
},
{
"bus":"root0",
"provider":"ACPI.CXL"
}
]
-b; --bus=
Specify CXL root device name(s), device id(s), and / or CXL bus provider
names to filter the listing. The supported provider names are “ACPI.CXL”
and “cxl_test”.
-P; --ports
Include port objects (CXL / PCIe root ports + Upstream Switch Ports) in
the listing.
-p; --port=
Specify CXL Port device name(s) (“port2”), device id(s) (“2”), host
device name(s) (“pci0000:34”), and / or port type name(s) to filter the
listing. The supported port type names are “root” and “switch”. Note
that a bus object is also a port, so the following two syntaxes are
equivalent:
# cxl list -B
# cxl list -P -p root -S
...where the '-S/--single' is required since descendant ports are always
included in a port listing and '-S/--single' stops after listing the
bus. Additionally, endpoint objects are ports so the following commands
are equivalent, and no '-S/--single' is required as endpoint ports are
terminal:
# cxl list -E
# cxl list -P -p endpoint
By default, only 'switch' ports are listed, i.e.
# cxl list -P
# cxl list -P -p switch
...are equivalent.
-S; --single
Specify whether the listing should emit all the objects that are
descendants of a port that matches the port filter, or only direct
descendants of the individual ports that match the filter. By default
all descendant objects are listed.
-E; --endpoints
Include endpoint objects (CXL Memory Device decoders) in the listing.
# cxl list -E
[
{
"endpoint":"endpoint2",
"host":"mem0"
}
]
-e; --endpoint
Specify CXL endpoint device name(s), or device id(s) to filter the
emitted endpoint(s).
-D; --decoders
Include decoder objects (CXL Memory decode capability instances in
buses, ports, and endpoints) in the listing.
-d; --decoder
Specify CXL decoder device name(s), device id(s), or decoder type names
to filter the emitted decoder(s). The format for a decoder name is
“decoder<port_id>.<instance_id>”. The possible decoder type names
are “root”, “switch”, or “endpoint”, similar to the port filter syntax.
-T; --targets
Extend decoder listings with downstream port target information, port
and bus listings with the downstream port information, and / or regions
with mapping information.
# cxl list -BTu -b ACPI.CXL
{
"bus":"root0",
"provider":"ACPI.CXL",
"nr_dports":1,
"dports":[
{
"dport":"ACPI0016:00",
"alias":"pci0000:34",
"id":"0"
}
]
}
-R; --regions
Include region objects in the listing.
-X; --dax
Append DAX information to region listings
# cxl list -RXu
{
"region":"region4",
"resource":"0xf010000000",
"size":"512.00 MiB (536.87 MB)",
"interleave_ways":2,
"interleave_granularity":4096,
"decode_state":"commit",
"daxregion":{
"id":4,
"size":"512.00 MiB (536.87 MB)",
"align":2097152,
"devices":[
{
"chardev":"dax4.0",
"size":"512.00 MiB (536.87 MB)",
"target_node":0,
"align":2097152,
"mode":"system-ram",
"online_memblocks":0,
"total_memblocks":4
}
]
}
}
-r; --region
Specify CXL region device name(s), or device id(s), to filter the
listing.
-v; --verbose
Increase verbosity of the output. This can be specified multiple times
to be even more verbose on the informational and miscellaneous output,
and can be used to override omitted flags for showing specific
information. Note that cxl list –verbose –verbose is equivalent to cxl
list -vv.
-
-v Enable –memdevs, –regions, –buses, –ports, –decoders, and –targets.
-
-vv Everything -v provides, plus include disabled devices with –idle.
-
-vvv Everything -vv provides, plus enable –health and –partition.
--debug
If the cxl tool was built with debug enabled, turn on debug messages.
-u; --human
By default the command will output machine-friendly raw-integer data.
Instead, with this flag, numbers representing storage size will be
formatted as human readable strings with units, other fields are
converted to hexadecimal strings.
COPYRIGHT
Copyright © 2016 - 2022, Intel Corporation. License GPLv2: GNU GPL version 2 http://gnu.org/licenses/gpl.html. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.