[PATCH 00/17] platform/x86/intel/ifs: Support group-based In-Field Scan and Diamond Rapids

[Ehab Ababneh]

Some Intel Xeon processors, starting with Diamond Rapids (DMR), share
one SCAN test engine between multiple CPU cores in a module (Dual-Core
Module, DCM), instead of only between the threads of a single core. All
logical processors that share an engine must start the In-Field Scan
(IFS) test at the same time. The current driver assumes the sharing
domain is cpu_smt_mask(), which does not hold on these systems. Also,
although the cores in a module are tested together, each core gets its
own result: on a DCM, one core can pass while the other fails.

This series:

 - Patch 1 removes the SBAF test, which is not planned for any CPU and
   whose test images were never published.

 - Patches 2-6 are cleanups and preparatory refactoring (comment fixes,
   clearer MSR bit names, u64 MSR bitfields, early return on image
   errors, a generic Array BIST parameter struct). Patches 2-4 have no
   functional change.

 - Patch 7 adds stop_cluster_cpuslocked(), the cluster-level counterpart
   of stop_core_cpuslocked(), so that all threads of a cluster can
   rendezvous and issue WRMSR at the same time.

 - Patches 8-10 enumerate ALL_LP_JOIN_NEEDED, select the CPUs to test
   together from topology_cluster_cpumask(), and check at driver init
   that TID_BIT_SHIFT matches that mask.

 - Patches 11-13 record per-CPU results for group tests and expose them
   through new sysfs files (status_list, details_list, cpus_ran_list,
   addnl_details_list). The existing status and details files remain,
   but now report the result of the CPU written to run_test rather than
   the first CPU in the group.

 - Patch 14 adds Diamond Rapids to the CPU match table.

 - Patch 15 removes the 256 limit on the batch file number.

 - Patches 16-17 update the IFS documentation and ABI document.

Most of this series was developed by Jithu Joseph and Qiuxu Zhuo, who
have both since left Intel. I have taken over upstreaming it, so please
send questions and review comments to me. The patches keep their
original authorship and Signed-off-by tags. Where Qiuxu changed a patch
written by someone else, the change is noted in brackets in the commit
message, and I have added my Signed-off-by to every patch.

Jithu Joseph (7):
  platform/x86/intel/ifs: Refactor Array BIST function interface
  platform/x86/intel/ifs: Enumerate the bit to determine if CPUs need to
    join for IFS tests
  platform/x86/intel/ifs: Select CPUs from topology_cluster_cpumask()
    for simultaneous IFS tests
  platform/x86/intel/ifs: Track and report scan results on a per-CPU
    basis
  platform/x86/intel/ifs: Add new sysfs interfaces {status, details,
    cpus_ran}_list
  platform/x86/intel/ifs: Add additional details sysfs interface
  platform/x86/intel/ifs: Add Intel Diamond Rapids server support

Qiuxu Zhuo (9):
  platform/x86/intel/ifs: Revert SBAF feature
  platform/x86/intel/ifs: Fix IFS sysfs interfaces in the comments
  platform/x86/intel/ifs: Clarify In-Field Scan MSR bit macro
    definitions
  platform/x86/intel/ifs: Use u64 to define the bits of IFS MSR
    registers
  platform/x86/intel/ifs: Early return on the IFS image hash/chunk error
  stop_machine: Add stop_cluster_cpuslocked() for per-cluster operations
  platform/x86/intel/ifs: Validate TID_BIT_SHIFT matches
    topology_cluster_cpumask()
  platform/x86/intel/ifs: Update IFS documentation
  Documentation/ABI: Update IFS ABI doc

Tony Luck (1):
  platform/x86/intel/ifs: Remove limit on number of batch files

 .../ABI/testing/sysfs-platform-intel-ifs      |  28 +-
 arch/x86/include/asm/msr-index.h              |  17 +-
 drivers/platform/x86/intel/ifs/core.c         |  97 +++--
 drivers/platform/x86/intel/ifs/ifs.h          | 223 +++++-----
 drivers/platform/x86/intel/ifs/load.c         |  52 +--
 drivers/platform/x86/intel/ifs/runtest.c      | 394 ++++++------------
 drivers/platform/x86/intel/ifs/sysfs.c        | 104 ++++-
 include/linux/stop_machine.h                  |  15 +
 include/trace/events/intel_ifs.h              |  27 --
 kernel/stop_machine.c                         |  35 +-
 tools/arch/x86/include/asm/msr-index.h        |  14 +-
 11 files changed, 487 insertions(+), 519 deletions(-)


base-commit: 98f039265e580291d5e76a11b2072541fbb1c393
-- 
2.43.0