Provided by: daxctl_76-1ubuntu1_amd64 bug

NAME

       daxctl-create-device - Create a devdax device

SYNOPSIS

       daxctl create-device [<options>]

EXAMPLES

       •   Creates dax0.1 with 4G of size

           # daxctl create-device -s 4G
           [
             {
               "chardev":"dax0.1",
               "size":4294967296,
               "target_node":0,
               "mode":"devdax"
             }
           ]

       •   Creates devices with fully available size on all regions

           # daxctl create-device -u
           [
             {
               "chardev":"dax0.1",
               "size":"15.63 GiB (16.78 GB)",
               "target_node":0,
               "mode":"devdax"
             },
             {
               "chardev":"dax1.1",
               "size":"15.63 GiB (16.78 GB)",
               "target_node":1,
               "mode":"devdax"
             }
           ]

       •   Creates dax0.1 with fully available size on region id 0

           # daxctl create-device -r 0 -u
           {
             "chardev":"dax0.1",
             "size":"15.63 GiB (16.78 GB)",
             "target_node":0,
             "mode":"devdax"
           }

DESCRIPTION

       Creates dax device in devdax mode in dynamic regions. The resultant can also be convereted
       to the system-ram mode which arranges for the dax range to be hot-plugged into the system
       as regular memory.

       daxctl create-device expects that the BIOS or kernel defines a range in the EFI memory map
       with EFI_MEMORY_SP. The resultant ranges mean that it’s 100% capacity is reserved for
       applications.

OPTIONS

       -r, --region=
           Restrict the operation to devices belonging to the specified region(s). A device-dax
           region is a contiguous range of memory that hosts one or more /dev/daxX.Y devices,
           where X is the region id and Y is the device instance id.

       -s, --size=
           For regions that support dax device cretion, set the device size in bytes. Otherwise
           it defaults to the maximum size specified by region. This option supports the suffixes
           "k" or "K" for KiB, "m" or "M" for MiB, "g" or "G" for GiB and "t" or "T" for TiB.

               The size must be a multiple of the region alignment.

       -a, --align
           Applications that want to establish dax memory mappings with page table entries
           greater than system base page size (4K on x86) need a device that is sufficiently
           aligned. This defaults to 2M. Note that "devdax" mode enforces all mappings to be
           aligned to this value, i.e. it fails unaligned mapping attempts.

       --input
           Applications that want to select ranges assigned to a device-dax instance, or wanting
           to establish previously created devices, can pass an input JSON file. The file option
           lets a user pass a JSON object similar to the one listed with "daxctl list".

               The device name is not re-created, but if a "chardev" is passed in
               the JSON file, it will use that to get the region id.

               Note that the JSON content in the file cannot be an array of
               JSON objects but rather a single JSON object i.e. without the
               array enclosing brackets.

       -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.

       -v, --verbose
           Emit more debug messages

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.

SEE ALSO

       daxctl-list(1),daxctl-reconfigure-device[1],daxctl-destroy-device[1]