[PATCH 0/3] cxl: Support Poison Inject & Clear by HPA

[alison.schofield@intel.com]

From: Alison Schofield <alison.schofield@intel.com>

This series allows expert users to inject and clear poison by writing a
Host Physical Address (HPA) to a region debugfs files. At the core of this
new functionality is a helper that translates an HPA into a Device Physical
Address (DPA) and a memdev based on the region's decoder configuration.

The set is not merely a convenience wrapper for these region poison
operations as it enables these operations for XOR interleaved regions
where they were previously impossible.

Patch 1 adds a locked variant of the inject and clear poison ops to
support callers that must hold locks during the entire translation and
operation sequence.

Patch 2 introduces the translation logic capable of returning the memdev
and DPA for a given HPA.

Patch 3 exposes the capability through region debugfs attributes that 
only appear when all participating memdevs support the poison commands.

These patches build on the existing memdev poison and region address
translation infrastructure and target debug and platform validation
scenarios.

Watch for the CXL Unit Test update to cxl-poison.sh posted separately
on this list.


Alison Schofield (3):
  cxl/core: Add locked variants of the poison inject and clear funcs
  cxl/region: Introduce HPA to DPA address translation
  cxl/region: Add inject and clear poison by HPA

 Documentation/ABI/testing/debugfs-cxl |  33 +++++
 drivers/cxl/core/core.h               |   4 +
 drivers/cxl/core/memdev.c             |  88 +++++++----
 drivers/cxl/core/region.c             | 201 ++++++++++++++++++++++++++
 drivers/cxl/cxlmem.h                  |   2 +
 5 files changed, 301 insertions(+), 27 deletions(-)


base-commit: 19272b37aa4f83ca52bdf9c16d5d81bdd1354494
-- 
2.37.3