[PATCH v4 0/7] ocxl: Implement Power9 as_notify/wait for OpenCAPI

[Alastair D'Silva]

From: Alastair D'Silva <alastair at d-silva.org>

The Power 9 as_notify/wait feature provides a lower latency way to
signal a thread that work is complete. This series enables the use of
this feature from OpenCAPI adapters, as well as addressing a potential
starvation issue when allocating thread IDs.

Changelog:
v4:
  Remove the "unique" statement from the set_thread_tidr function and
    move the text explaining why it is safe from the commit message
    to the function description
v3:
  Fix references to POWER9
  Remove stray whitespace edit from docs
  Add more details to commit message for "use task_pid_nr()"
  Retitle patch 6 to indicate OCXL rather than CPU features
v2:
  Rename get_platform IOCTL to get_features
  Move stray edit from patch 1 to patch 3

Alastair D'Silva (7):
  powerpc: Add TIDR CPU feature for POWER9
  powerpc: Use TIDR CPU feature to control TIDR allocation
  powerpc: use task_pid_nr() for TID allocation
  ocxl: Rename pnv_ocxl_spa_remove_pe to clarify it's action
  ocxl: Expose the thread_id needed for wait on POWER9
  ocxl: Add an IOCTL so userspace knows what OCXL features are available
  ocxl: Document new OCXL IOCTLs

 Documentation/accelerators/ocxl.rst   |  11 ++++
 arch/powerpc/include/asm/cputable.h   |   3 +-
 arch/powerpc/include/asm/pnv-ocxl.h   |   2 +-
 arch/powerpc/include/asm/switch_to.h  |   1 -
 arch/powerpc/kernel/dt_cpu_ftrs.c     |   1 +
 arch/powerpc/kernel/process.c         | 101 +---------------------------------
 arch/powerpc/platforms/powernv/ocxl.c |   4 +-
 drivers/misc/ocxl/context.c           |   5 +-
 drivers/misc/ocxl/file.c              |  78 ++++++++++++++++++++++++++
 drivers/misc/ocxl/link.c              |  38 ++++++++++++-
 drivers/misc/ocxl/ocxl_internal.h     |   1 +
 include/misc/ocxl.h                   |   9 +++
 include/uapi/misc/ocxl.h              |  14 +++++
 13 files changed, 163 insertions(+), 105 deletions(-)

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2.14.3