[Skiboot] [PATCHv2 0/6] Enable stop4 idle state

[Akshay Adiga]

The following patch series enabled the infrastructure to support deeper
idle states like STOP4 on POWER9 platform.

When cpu enters stop4 or deeper state it losses few critical hypervisor
sprs. In the POWER9 platform stop-api provides interface for opal to call
into low level platform firmware/microcode to configure and setup various
actions on wakeup from deep idle state. 

Some SPRs that have implicit value like HRMOR are directly set from
OPAL, while other are left to be configured from Linux using opal
calls.

p9 stop api is used to restore these hypervisor sprs with
correct values. Sprs like HRMOR is configured from skiboot,
where as LPCR, HID and MSR are configured by kernel. Kernel
uses opal_slw_set_reg() to configure these sprs.

Patch 1: p9_stop_api from hostboot code.
Patch 2: Add header file which provides glibc style endianness check
Patch 3: Enable opal_slw_set_reg() for power9
Patch 4: Configure HRMOR restore using stop api
Patch 5: Allow deeper states (like stop4) if homer address is set
Patch 6: Adds stop4 as the deepest idle state in device tree for dd1

Changes from v1 :
 * Added patch6, which adds stop4 to device-tree

Akshay Adiga (6):
  SLW: Add support for p9_stop_api
  libpore: Add GLIBC style endianness detection
  SLW: Add opal_slw_set_reg support for power9
  SLW: Configure self-restore for HRMOR
  SLW: Allow deep states if homer address is known
  SLW: Set stop4 as deepest idle state

Akshay Adiga (6):
  SLW: Add support for p9_stop_api
  libpore: Add GLIBC style endianness detection
  SLW: Add opal_slw_set_reg support for power9
  SLW: Configure self-restore for HRMOR
  SLW: Allow deep states if homer address is known
  SLW: Set stop4 as deepest idle state

 hw/slw.c                                 |  116 +++-
 include/p9_stop_api.H                    |  163 +++++
 libpore/Makefile.inc                     |    2 +-
 libpore/endian.h                         |   29 +
 libpore/p9_cpu_reg_restore_instruction.H |   76 +++
 libpore/p9_hcd_header_defs.H             |  152 +++++
 libpore/p9_hcd_memmap_base.H             |  516 +++++++++++++++
 libpore/p9_stop_api.C                    | 1028 ++++++++++++++++++++++++++++++
 libpore/p9_stop_api.H                    |  163 +++++
 libpore/p9_stop_data_struct.H            |  149 +++++
 libpore/p9_stop_util.C                   |  187 ++++++
 libpore/p9_stop_util.H                   |  143 +++++
 12 files changed, 2693 insertions(+), 31 deletions(-)
 create mode 100644 include/p9_stop_api.H
 create mode 100644 libpore/endian.h
 create mode 100644 libpore/p9_cpu_reg_restore_instruction.H
 create mode 100644 libpore/p9_hcd_header_defs.H
 create mode 100644 libpore/p9_hcd_memmap_base.H
 create mode 100644 libpore/p9_stop_api.C
 create mode 100644 libpore/p9_stop_api.H
 create mode 100644 libpore/p9_stop_data_struct.H
 create mode 100644 libpore/p9_stop_util.C
 create mode 100644 libpore/p9_stop_util.H

-- 
2.5.5