[RFC PATCH v2 0/6] cxl: add poison event handler

[Shiyang Ruan]

Changes:
RFCv1 -> RFCv2:
1. update commit message of PATCH 1
2. use memory_failure_queue() instead of MCE
3. also report poison in debugfs when injecting poison
4. correct DPA->HPA logic:
     find memdev's endpoint decoder to find the region it belongs to
5. distinguish transaction_type of GMER, only handle POISON related
     event for now


Currently driver only traces cxl events, poison injection (for both vmem
and pmem type) on cxl memdev is silent.  OS needs to be notified then it
could handle poison range in time.  Per CXL spec, the device error event
could be signaled through FW-First and OS-First methods.

So, add poison event handler in OS-First method:
  - qemu:
    - CXL device report POISON event to OS by MSI by sending GMER after
      injecting a poison record
  - CXL driver                                  <-- this patchset
    a. parse the POISON event from GMER;
    b. retrieve POISON list from memdev;
    c. translate poisoned DPA to HPA;
    d. enqueue poisoned PFN to memory_failure's work queue;


Shiyang Ruan (6):
  cxl/core: correct length of DPA field masks
  cxl/core: introduce cxl_mem_report_poison()
  cxl/core: add report option for cxl_mem_get_poison()
  cxl/core: report poison when injecting from debugfs
  cxl: add definition for transaction_type
  cxl/core: add poison injection event handler

 drivers/cxl/core/mbox.c   | 126 +++++++++++++++++++++++++++++++++-----
 drivers/cxl/core/memdev.c |   5 +-
 drivers/cxl/core/region.c |   8 +--
 drivers/cxl/core/trace.h  |   6 +-
 drivers/cxl/cxlmem.h      |  13 ++--
 include/linux/cxl-event.h |  17 ++++-
 6 files changed, 144 insertions(+), 31 deletions(-)

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2.34.1