[NDCTL PATCH v4 0/3] ndctl: Add support and test for CXL Features support

[Dave Jiang <dave.jiang@intel.com>]

v3:
- Update test to use opcode instead of command id.

v2:
- Drop features device enumeration
- Add discovery of char device under memdev

The series provides support of libcxl enumerating FWCTL character device
under the cxl_memdev device. It discovers the char device major
and minor numbers for the CXL features device in order to allow issuing
of ioctls to the device. 

A unit test is added to locate cxl_memdev exported by the cxl_test
kernel module and issue all the supported ioctls to the associated
FWCTL char device to verify that all the ioctl paths are working as expected.

Kernel series: https://lore.kernel.org/linux-cxl/20250218225721.2682235-1-dave.jiang@intel.com/T/#t

Dave Jiang (3):
      cxl: Add cxl_bus_get_by_provider()
      cxl: Enumerate major/minor of FWCTL char device
      cxl/test: Add test for cxl features device

 cxl/lib/libcxl.c     |  85 ++++++++++++++++
 cxl/lib/libcxl.sym   |   7 ++
 cxl/lib/private.h    |   1 +
 cxl/libcxl.h         |   4 +
 test/cxl-features.sh |  31 ++++++
 test/fwctl.c         | 383 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 test/meson.build     |  45 +++++++++
 7 files changed, 556 insertions(+)