1DAXCTL-CREATE-DEVI(1)                                    DAXCTL-CREATE-DEVI(1)
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NAME

6       daxctl-create-device - Create a devdax device
7

SYNOPSIS

9       daxctl create-device [<options>]
10

EXAMPLES

12       •   Creates dax0.1 with 4G of size
13
14           # daxctl create-device -s 4G
15           [
16             {
17               "chardev":"dax0.1",
18               "size":4294967296,
19               "target_node":0,
20               "mode":"devdax"
21             }
22           ]
23
24       •   Creates devices with fully available size on all regions
25
26           # daxctl create-device -u
27           [
28             {
29               "chardev":"dax0.1",
30               "size":"15.63 GiB (16.78 GB)",
31               "target_node":0,
32               "mode":"devdax"
33             },
34             {
35               "chardev":"dax1.1",
36               "size":"15.63 GiB (16.78 GB)",
37               "target_node":1,
38               "mode":"devdax"
39             }
40           ]
41
42       •   Creates dax0.1 with fully available size on region id 0
43
44           # daxctl create-device -r 0 -u
45           {
46             "chardev":"dax0.1",
47             "size":"15.63 GiB (16.78 GB)",
48             "target_node":0,
49             "mode":"devdax"
50           }
51

DESCRIPTION

53       Creates dax device in devdax mode in dynamic regions. The resultant can
54       also be convereted to the system-ram mode which arranges for the dax
55       range to be hot-plugged into the system as regular memory.
56
57       daxctl create-device expects that the BIOS or kernel defines a range in
58       the EFI memory map with EFI_MEMORY_SP. The resultant ranges mean that
59       it’s 100% capacity is reserved for applications.
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OPTIONS

62       -r, --region=
63           Restrict the operation to devices belonging to the specified
64           region(s). A device-dax region is a contiguous range of memory that
65           hosts one or more /dev/daxX.Y devices, where X is the region id and
66           Y is the device instance id.
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68       -s, --size=
69           For regions that support dax device cretion, set the device size in
70           bytes. Otherwise it defaults to the maximum size specified by
71           region. This option supports the suffixes "k" or "K" for KiB, "m"
72           or "M" for MiB, "g" or "G" for GiB and "t" or "T" for TiB.
73
74               The size must be a multiple of the region alignment.
75
76       -a, --align
77           Applications that want to establish dax memory mappings with page
78           table entries greater than system base page size (4K on x86) need a
79           device that is sufficiently aligned. This defaults to 2M. Note that
80           "devdax" mode enforces all mappings to be aligned to this value,
81           i.e. it fails unaligned mapping attempts.
82
83       --input
84           Applications that want to select ranges assigned to a device-dax
85           instance, or wanting to establish previously created devices, can
86           pass an input JSON file. The file option lets a user pass a JSON
87           object similar to the one listed with "daxctl list".
88
89               The device name is not re-created, but if a "chardev" is passed in
90               the JSON file, it will use that to get the region id.
91
92               Note that the JSON content in the file cannot be an array of
93               JSON objects but rather a single JSON object i.e. without the
94               array enclosing brackets.
95
96       -u, --human
97           By default the command will output machine-friendly raw-integer
98           data. Instead, with this flag, numbers representing storage size
99           will be formatted as human readable strings with units, other
100           fields are converted to hexadecimal strings.
101
102       -v, --verbose
103           Emit more debug messages
104

106       Copyright © 2016 - 2022, Intel Corporation. License GPLv2: GNU GPL
107       version 2 http://gnu.org/licenses/gpl.html. This is free software: you
108       are free to change and redistribute it. There is NO WARRANTY, to the
109       extent permitted by law.
110

SEE ALSO

112       linkdaxctl:daxctl-list[1],daxctl-reconfigure-device[1],daxctl-destroy-device[1]
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116                                  01/13/2023             DAXCTL-CREATE-DEVI(1)
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