[v9,0/3] CXL XOR Interleave Arithmetic

Message

Alison Schofield Nov. 30, 2022, 10:47 p.m. UTC

From: Alison Schofield <[e-mail]>

Add support for the new 'XOR' Interleave Arithmetic as defined
in the CXL 3.0 Specification:
https://www.computeexpresslink.org/download-the-specification

Changes in v9:
- Add Jonathan's Reviewed-by tags to Patches 2/3
- Move calc of n to separate func (Jonathan)
- Use ways_to_cxl() for self-documentation, despite overkill (Jonathan)
- Use the #define ACPI_CEDT_CFMWS_ARITHMETIC_XOR in cxl_test (Jonathan)
- Tidy up whitespace and trailing commas (Jonathan)
  *I went w trailing commas, because we should always expect more :)
  
Changes in v8:
- Move typedef of cxl_cal_hb_fn in cxl.h earlier for use in cxl_root_decoder
  (It's a bit soon, and a bit small, for rev'ing without awaiting review,
  but want this to be in sync with the address translation patchset
  that follows.)

Changes in v7:
- Set calc_hb only once (DavidL, Dan)
- Refactor to eliminate the decoder_add goto (DavidL)
- dev_err() and fail on unknown interleave arithmetic (DavidL)
- Add NULL check after devm_zalloc() of cximsd (DavidL)
- Rename struct cxims_data cxl_cxims_data

Changes in v6:
- Rebase on 6.1-rc4, merging with Dan's latest cxl_test work.
- ACPI patch is now the 'official' linuxized version, not yet merged.

Changes in v5:
- Add to 'n' for 6 & 12 way. (v3->v4 broke it)
- Clean up x3 index init. (Dan)
- Remove unneeded HB's from cxl_test topology.
- Remove dependency on stale patch in cxl_test.

Changes in v4:
- Use GENMASK_ULL to fix i386 arch build (0-day)
- Use do_div to fix ARM arch build (0-day)
- Update comments in ACPICA patch to reflect new state of the
  ACPICA patch - pending again in github.

Changes in v3:
- Fix the 3, 6, 12 way interleave (again).
- Do not look for a CXIMS when not needed for x1 & x3 interleaves
- New cxl_test patch: Add cxl_test module support for this feature
- In a separate ndctl patch, cxl test: cxl_xor_region is added

Changes in v2:
- Use ilog2() of the decoded interleave ways to determine number
  of xormaps, instead of using encoded ways directly. This fixes
  3, 6, and 12 way interleaves. (Dan)

Alison Schofield (3):
  ACPICA commit 2d8dc0383d3c908389053afbdc329bbd52f009ce
  cxl/acpi: Support CXL XOR Interleave Math (CXIMS)
  tools/testing/cxl: Add XOR Math support to cxl_test

 drivers/cxl/acpi.c           | 136 ++++++++++++++++++++++++++++++++++-
 drivers/cxl/core/port.c      |   9 ++-
 drivers/cxl/cxl.h            |  11 ++-
 include/acpi/actbl1.h        |  35 ++++++++-
 tools/testing/cxl/test/cxl.c | 118 +++++++++++++++++++++++++++++-
 5 files changed, 297 insertions(+), 12 deletions(-)


base-commit: f0c4d9fc9cc9462659728d168387191387e903cc