[PATCH v3 0/8] cxl: CXL Inject & Clear Poison

[alison.schofield@intel.com]

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

Changes in v3: 

- Built on cxl/next plus the Get Poison list patchset here:
  https://lore.kernel.org/linux-cxl/cover.1676685180.git.alison.schofield@intel.com/

- Two new patches are appended to address Dan's deprecate ask:
  	cxl/memdev: Make inject and clear poison cmds kernel exclusive
  	cxl/mbox: Block inject and clear poison opcodes in raw mode
  I didn't deprecate the ioctls as Dan suggested. Instead, I followed
  on Ira's recent clean up wrt enabled and exclusive commands, deciding
  that the honest response to a cxl_query() would be 'Enabled' (if hardware
  supports) and kernel 'Exclusive' (always). Please take a look.

- Move IS_ENABLED(CONFIG_CXL_POISON_INJECT) test into each attr check (Dan)
- Fail updates to poison_inject_max when poison list is not empty (DaveJ)
- Make poison_inject_max a sysfs attr, rather than module param (Dan)
- Kconfig: add note regarding debug intent (Dan)
- Kept Jonathan's Reviewed-by Tag on Patches 1-6

Link to v2: https://lore.kernel.org/linux-cxl/cover.1674101475.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 (8):
  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 sysfs attr to test poison injection limits
  cxl/memdev: Make inject and clear poison cmds kernel exclusive
  cxl/mbox: Block inject and clear poison opcodes in raw mode

 Documentation/ABI/testing/sysfs-bus-cxl |  40 +++++
 drivers/cxl/Kconfig                     |  11 ++
 drivers/cxl/core/mbox.c                 |   6 +
 drivers/cxl/core/memdev.c               | 162 ++++++++++++++++++
 drivers/cxl/cxlmem.h                    |  11 ++
 include/uapi/linux/cxl_mem.h            |  21 ++-
 tools/testing/cxl/test/mem.c            | 216 +++++++++++++++++++++---
 7 files changed, 443 insertions(+), 24 deletions(-)

-- 
2.37.3