[ndctl PATCH v2 0/3] cxl: support mixed-granularity regions

[Alison Schofield <alison.schofield@intel.com>]

This is an update to a series[1] that was previously sent out without a
cover letter. In v2 a fixup prerequisite patch is added and the tests
are expanded based on the kernel series review feedback [2].

[1] https://lore.kernel.org/all/fa5c109f08824180f58341ebd9055545a2ff3142.1780099216.git.alison.schofield@intel.com/
[2] https://lore.kernel.org/all/cover.1787255388.git.alison.schofield@intel.com/

Changes in v2:
Patch 1: cxl/region: round default region size within root decoder extent
- New patch to fixup the ALIGN_DOWN usage that doesn't always work
Patch 2: cxl/region: allow mixed-granularity regions
- Reject a granularity that is not power of 2
- Update man page -g section
Patch 3: test/cxl-region-mixed.sh: test mixed-granularity region creation
- Cover the third pmem window, a 3-way at 1KB across 3 HBs
- Add two test cases, a 6-way and 12-way, for more spec defined coverage
- Select endpoints by walking hierarchy instead of handbuilding lists per case
- Assert 2 switches below each HB and 2 EP below each switch
- Require negative test cases to fail at first target write
- Skip rather than fail when kernel has no registry
- Drop selector walk language to align with kernel language

The base commit is the current ndctl pending branch.

Alison Schofield (3):
  cxl/region: round default region size within root decoder extent
  cxl/region: allow mixed-granularity regions
  test/cxl-region-mixed.sh: test mixed-granularity region creation

 Documentation/cxl/cxl-create-region.txt |  21 +-
 cxl/region.c                            |  39 ++-
 test/cxl-region-mixed.sh                | 413 ++++++++++++++++++++++++
 test/meson.build                        |   2 +
 4 files changed, 462 insertions(+), 13 deletions(-)
 create mode 100644 test/cxl-region-mixed.sh


base-commit: ca9a1d69dc8894836999042ae6793fd7698b78fd
-- 
2.37.3