[PATCH v2 0/6] cxl: CXL Inject & Clear Poison

[alison.schofield@intel.com]

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

Built on cxl/next plus Patchset: CXL Poison List Retrieval & Tracing:
https://lore.kernel.org/linux-cxl/de11785ff05844299b40b100f8e0f56c7eef7f08.1674070170.git.alison.schofield@intel.com/

Changes in v2:
- Add Jonathan Reviewed-by tags to Patches 1,2,4
- Clean up input payload structs for both inject and clear (Dan)
- Commit message cleanups, including spec references (Dave)
- Use CXL_POISON_LEN_MULT in define of clear write data
- Use IS_ALIGNED() for 64byte align check (Dan)
- Add Kconfig CXL_POISON_INJECT  (Dan)
- Trivial space cleanup (Jonathan)
- Doc/ABI cleanup (Dave, Dan)
- Mock: Only use injected errors for get poison list
- Mock: Use 'POISONLMT -ENXIO' text from CMD_CMD_RC_TABLE  (Jonathan)
- Mock: Add Patch 6/6: A module param to mock device inject limit

Link to v1: https://lore.kernel.org/linux-cxl/cover.1669781852.git.alison.schofield@intel.com/

Introducing Inject and Clear Poison support for CXL Devices.

These are optional commands, meaning not all CXL devices must support
them. The sysfs attributes, inject_poison and clear_poison, are only
visible for devices reporting support of the capability and when the
kernel Kconfig option CONFIG_CXL_POISON_INJECT is on. (Default: off)

Example:
# echo 0x40000000 > /sys/bus/cxl/devices/mem1/inject_poison
# echo 1 > /sys/bus/cxl/devices/mem1/trigger_poison_list

cxl_poison: memdev=mem1 pcidev=cxl_mem.1 region= region_uuid=00000000-0000-0000-0000-000000000000 hpa=0xffffffffffffffff dpa=0x40000000 length=0x40 source=Injected flags= overflow_time=0


Alison Schofield (6):
  cxl/memdev: Add support for the Inject Poison mailbox command
  cxl/memdev: Add support for the Clear Poison mailbox command
  tools/testing/cxl: Mock the Inject Poison mailbox command
  tools/testing/cxl: Mock the Clear Poison mailbox command
  tools/testing/cxl: Use injected poison for get poison list
  tools/testing/cxl: Add a param to test poison injection limits

 Documentation/ABI/testing/sysfs-bus-cxl |  40 ++++++
 drivers/cxl/Kconfig                     |  10 ++
 drivers/cxl/core/memdev.c               | 122 ++++++++++++++++
 drivers/cxl/cxlmem.h                    |  11 ++
 tools/testing/cxl/test/mem.c            | 178 +++++++++++++++++++++---
 5 files changed, 341 insertions(+), 20 deletions(-)

-- 
2.37.3