cxl-reserve-dpa1
Allocate device-physical address space
Usage
cxl reserve-dpa
<mem0>
[<mem1>..<memN>]
[<options>]
Options
<memory device(s)>
A memX device name, or a memdev id number. Restrict the operation to the specified memdev(s). The keyword all can be specified to indicate the lack of any restriction.
-
-S, --serial -
Rather an a memdev id number, interpret the <memdev> argument(s) as a list of serial numbers.
-b, --bus=
Restrict the operation to the specified bus.
-
-d, --decoder -
Specify the decoder to attempt the allocation. The CXL specification mandates that allocations must be ordered by DPA and decoder instance. I.e. the lowest DPA allocation on the device is covered by decoder0, and the last / highest DPA allocation is covered by the last decoder. This ordering is enforced by the kernel. By default the tool picks the next available decoder.
-
-t, --type -
Select the partition for the allocation. CXL devices implement a partition that divides ram and pmem capacity, where pmem capacity consumes the higher DPA capacity above the partition boundary. The type defaults to pmem. Note that given CXL DPA allocation constraints, once any pmem allocation is established then all remaining ram capacity becomes reserved (skipped).
-
-f, --force -
The kernel enforces CXL DPA allocation ordering constraints, and the tool anticipates those and fails operations that are expected to fail without sending them to the kernel. For test purposes, continue to attempt "expected to fail" operations to exercise the driver.
-
-s, --size -
Specify the size of the allocation. 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. This defaults to "all available capacity of the specified type".
-
-v -
Turn on verbose debug messages in the library (if libcxl was built with logging and debug enabled).
Releases
3 releases since Debian 12 (Bookworm); the text changed 2 times.