Introduce the first cut at a 'cxl create-region' command, which uses the ABI proposed by the kernel patches in [1], and builds on the create-region foundation laid out in [2].
This introduces libcxl objects for regions and their memdev mappings, adds listing support for them, and libcxl APIs to create, enable, disable, and destroy regions. These are consumed by respective cxl-cli commands to perform the same region management operations. The 'cxl create-region' command deserves a bit more detail. Its current version can be considered a fundamental 'plumbing' implementation. It allows, and in some cases, requires the user to specify the parameters for the region being created. Future enhancements to this will allow a simple 'cxl create-region' invocation to automatically pick suitable root decoders, memdev endpoints, and interleave settings to create a maximally sized and interleaved region. Today, the create-region command requires the following from the user: -d <root decoder> : the root decoder (CFMWS window) under which to create the region -m or -e <targets>: the memdev or endpoint decoder targets that will form the new region It can pick the following settings automatically (though the user can also override these if desired): -w : interleave ways - picked based on the number of memdev / endpoint decoder targets supplied -g : interleave granularity - defaults to the interleave granularity advertised by the root decoder -t : type of region - defaults to pmem. The ram (volatile) type is not supported yet. -s : size of region - deduced based on sizes of the specified targets [1]: https://lore.kernel.org/linux-cxl/165784324066.1758207.15025479284039479071.st...@dwillia2-xfh.jf.intel.com/ [2]: https://lore.kernel.org/linux-cxl/165781810717.1555691.1411727384567016588.st...@dwillia2-xfh.jf.intel.com/ Vishal Verma (8): libcxl: add a depth attribute to cxl_port cxl/port: Consolidate the debug option in cxl-port man pages libcxl: Introduce libcxl region and mapping objects cxl-cli: add region listing support libcxl: add low level APIs for region creation cxl: add a 'create-region' command cxl: add commands to {enable,disable,destroy}-region cxl/list: make memdevs and regions the default listing Documentation/cxl/cxl-create-region.txt | 111 ++++ Documentation/cxl/cxl-destroy-region.txt | 39 ++ Documentation/cxl/cxl-disable-port.txt | 5 +- Documentation/cxl/cxl-disable-region.txt | 34 + Documentation/cxl/cxl-enable-port.txt | 5 +- Documentation/cxl/cxl-enable-region.txt | 34 + Documentation/cxl/cxl-list.txt | 13 +- Documentation/cxl/debug-option.txt | 4 + Documentation/cxl/decoder-option.txt | 6 + Documentation/cxl/region-description.txt | 7 + cxl/lib/private.h | 37 ++ cxl/lib/libcxl.c | 795 ++++++++++++++++++++++- cxl/builtin.h | 4 + cxl/filter.h | 6 + cxl/json.h | 5 + cxl/libcxl.h | 64 +- cxl/cxl.c | 4 + cxl/filter.c | 121 +++- cxl/json.c | 123 ++++ cxl/list.c | 26 +- cxl/region.c | 699 ++++++++++++++++++++ .clang-format | 2 + Documentation/cxl/meson.build | 7 + cxl/lib/libcxl.sym | 36 + cxl/meson.build | 1 + 25 files changed, 2143 insertions(+), 45 deletions(-) create mode 100644 Documentation/cxl/cxl-create-region.txt create mode 100644 Documentation/cxl/cxl-destroy-region.txt create mode 100644 Documentation/cxl/cxl-disable-region.txt create mode 100644 Documentation/cxl/cxl-enable-region.txt create mode 100644 Documentation/cxl/debug-option.txt create mode 100644 Documentation/cxl/decoder-option.txt create mode 100644 Documentation/cxl/region-description.txt create mode 100644 cxl/region.c -- 2.36.1
