[ndctl,RFC,0/5] Initial CXL support

Message

Verma, Vishal L Jan. 12, 2021, 12:33 a.m. UTC

This is an RFC patchset to add a new utility and library to support
CXL devices. This comprehends the kernel's sysfs layout for CXL
devices, and implements a command submission harness for CXL mailbox
commands via ioctl()s definied by the cxl_mem driver.

These patches include:
- libcxl representation of cxl_mem devices
- A command submission harness through libcxl
- A 'cxl-list' command which displays information about a device

Things missing, or next steps are:
- A test/libcxl.c to exercise all library interfaces
- Testing 'vendor specific' commands exported by the QEMU
  implementation[1]
- API documentation

The latest kernel patches can be found at [2].
An ndctl branch with these patches is also available at [3]

[1]: https://lore.kernel.org/qemu-devel/[e-mail]/
[2]: https://gitlab.com/bwidawsk/linux/-/commits/cxl-2.0v3
[3]: https://github.com/pmem/ndctl/tree/cxl-2.0v1

Vishal Verma (5):
  cxl: add a cxl utility and libcxl library
  cxl: add a local copy of the cxl_mem UAPI header
  libcxl: add support for command query and submission
  libcxl: add accessors for retrieving 'Identify' information
  cxl/list: augment cxl-list with more data from the identify command

 Documentation/cxl/cxl-list.txt       |  65 +++
 Documentation/cxl/cxl.txt            |  34 ++
 Documentation/cxl/human-option.txt   |   8 +
 Documentation/cxl/verbose-option.txt |   5 +
 configure.ac                         |   3 +
 Makefile.am                          |   4 +-
 Makefile.am.in                       |   5 +
 cxl/lib/private.h                    |  87 ++++
 cxl/lib/libcxl.c                     | 714 +++++++++++++++++++++++++++
 cxl/builtin.h                        |   8 +
 cxl/cxl_mem.h                        | 176 +++++++
 cxl/libcxl.h                         |  66 +++
 util/filter.h                        |   2 +
 util/json.h                          |   4 +
 util/main.h                          |   3 +
 cxl/cxl.c                            |  95 ++++
 cxl/list.c                           | 138 ++++++
 util/filter.c                        |  20 +
 util/json.c                          |  46 ++
 Documentation/cxl/Makefile.am        |  58 +++
 cxl/Makefile.am                      |  21 +
 cxl/lib/Makefile.am                  |  32 ++
 cxl/lib/libcxl.pc.in                 |  11 +
 cxl/lib/libcxl.sym                   |  41 ++
 24 files changed, 1644 insertions(+), 2 deletions(-)
 create mode 100644 Documentation/cxl/cxl-list.txt
 create mode 100644 Documentation/cxl/cxl.txt
 create mode 100644 Documentation/cxl/human-option.txt
 create mode 100644 Documentation/cxl/verbose-option.txt
 create mode 100644 cxl/lib/private.h
 create mode 100644 cxl/lib/libcxl.c
 create mode 100644 cxl/builtin.h
 create mode 100644 cxl/cxl_mem.h
 create mode 100644 cxl/libcxl.h
 create mode 100644 cxl/cxl.c
 create mode 100644 cxl/list.c
 create mode 100644 Documentation/cxl/Makefile.am
 create mode 100644 cxl/Makefile.am
 create mode 100644 cxl/lib/Makefile.am
 create mode 100644 cxl/lib/libcxl.pc.in
 create mode 100644 cxl/lib/libcxl.sym