[Skiboot] [PATCH v3 0/8] Initial fused-core support for POWER9

Vaidyanathan Srinivasan svaidy at linux.vnet.ibm.com
Mon Mar 25 04:25:35 AEDT 2019


This is based on initial work by Ryan Grimm with additions & cleanups by


This includes forward porting to latest upstream and fixing 'make check'.

Some notes:
- This currently needs a special modified HostBoot
- It's missing the "ibm,thread-groups" property to inform Linux about big cores
- We need to look at HMI issues, as in some cases TFAC errors get only sent to
  one half but both half need to rendez-vous, so we need to "trigger" an error
  in the other half as well.


- Drop the HDAT workaround, since the issue is resolved with a fix in
  hdat layer
- Minor nits in comments
- Keep naming consistent between fused-core and normal-core
- Trim stop state list and add stop2
- stop0,1,2 states were tested for 24hrs on ZZ with fused core chips

The above aren't blockers, it should be possible to merge this first.

Benjamin Herrenschmidt (7):
  xive: Set the fused core mode properly
  chip: Fix pir_to_thread_id for fused cores
  cpu: Keep track of the "ec_primary" in big core more
  direct-ctl: Use the EC primary for special wakeups
  slw: Limit fused cores P9 to STOP0/1/2
  cpu: Make cpu_get_core_index() return the fused core number
  imc: Use pir_to_core_id() rather than cpu_get_core_index()

Ryan Grimm (1):
  Add basic P9 fused core support

 asm/head.S               | 24 ++++++++++--
 core/chip.c              | 32 +++++++++++++---
 core/cpu.c               | 61 ++++++++++++++++++++++++------
 core/direct-controls.c   | 12 +++---
 core/fast-reboot.c       |  2 +-
 hdata/test/hdata_to_dt.c |  9 ++++-
 hw/imc.c                 |  6 +--
 hw/slw.c                 | 80 ++++++++++++++++++++++++++++++++++++++++
 hw/xive.c                |  6 ++-
 include/chip.h           | 43 +++++++++++++++++++++
 include/cpu.h            | 13 +++++++
 include/xive.h           |  1 +
 include/xscom.h          |  3 ++
 13 files changed, 259 insertions(+), 33 deletions(-)


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