[GIT PULL] OpenRISC updates for 4.15

[Stafford Horne]

Hello Linus,

The OpenRISC work is a bit more interesting this time, adding SMP support and a
few general cleanups.  Please consider for pull,

The following changes since commit bb176f67090ca54869fc1262c913aa69d2ede070:

  Linux 4.14-rc6 (2017-10-23 06:49:47 -0400)

are available in the git repository at:

  git://github.com/openrisc/linux.git tags/for-linus

for you to fetch changes up to 610f01b9a88a9ef8b506709a825c17395c56a62a:

  openrisc: fix possible deadlock scenario during timer sync (2017-11-03 14:01:17 +0900)

----------------------------------------------------------------
OpenRISC updates for v4.15

Small Things:
 - Move OpenRISC docs into Documentation and clean them up
 - Document previously undocumented devicetree bindings
 - Update the or1ksim dts to use stdout-path

OpenRISC SMP support details:
 - First the "use shadow registers" patch get's the architecture ready for SMP.
 - The "add 1 and 2 byte cmpxchg support" and "use qspinlocks and
   qrwlocks" add the SMP locking infrastructure as needed.  Using the
   qspinlocks and qrwlocks as suggested by Peter Z while reviewing the
   original spinlocks implementation.
 - The "support for ompic" adds a new irqchip device which is used for
   IPI communication to support SMP.
 - The "initial SMP support" adds smp.c and makes changes to all of the
   necessary data-structures to be per-cpu.
 - The remaining patches are bug fixes and debug helpers which I wanted
   to keep separate from the "initial SMP support" in order to allow them
   to be reviewed on their own. This includes:
    - add cacheflush support to fix icache aliasing
    - fix initial preempt state for secondary cpu tasks
    - sleep instead of spin on secondary wait
    - support framepointers and STACKTRACE_SUPPORT
    - enable LOCKDEP_SUPPORT and irqflags tracing
    - timer sync: Add tick timer sync logic
    - fix possible deadlock in timer sync, pointed out by mips guys

Note: the irqchip patch was reviewed with Marc and we agreed to push it
together with these patches.

----------------------------------------------------------------
Jan Henrik Weinstock (1):
      openrisc: add cacheflush support to fix icache aliasing

Luc Van Oostenryck (1):
      openrisc: pass endianness info to sparse

Stafford Horne (15):
      openrisc: dts: or1ksim: Add stdout-path
      MAINTAINERS: Add OpenRISC pic maintainer
      Documentation: Move OpenRISC docs out of arch/
      Documentation: openrisc: Updates to README
      dt-bindings: openrisc: Add OpenRISC platform SoC
      openrisc: add 1 and 2 byte cmpxchg support
      openrisc: use qspinlocks and qrwlocks
      dt-bindings: add openrisc to vendor prefixes list
      irqchip: add initial support for ompic
      openrisc: fix initial preempt state for secondary cpu tasks
      openrisc: sleep instead of spin on secondary wait
      openrisc: support framepointers and STACKTRACE_SUPPORT
      openrisc: enable LOCKDEP_SUPPORT and irqflags tracing
      openrisc: add tick timer multi-core sync logic
      openrisc: fix possible deadlock scenario during timer sync

Stefan Kristiansson (3):
      openrisc: use shadow registers to save regs on exception
      openrisc: initial SMP support
      openrisc: add simple_smp dts and defconfig for simulators

 .../interrupt-controller/openrisc,ompic.txt        |  22 ++
 .../bindings/openrisc/opencores/or1ksim.txt        |  39 ++++
 .../devicetree/bindings/vendor-prefixes.txt        |   1 +
 .../openrisc/README                                |  65 +++---
 .../TODO.openrisc => Documentation/openrisc/TODO   |   0
 MAINTAINERS                                        |   4 +
 arch/openrisc/Kconfig                              |  49 +++-
 arch/openrisc/Makefile                             |   1 +
 arch/openrisc/boot/dts/or1ksim.dts                 |   7 +-
 arch/openrisc/boot/dts/simple_smp.dts              |  63 +++++
 arch/openrisc/configs/simple_smp_defconfig         |  66 ++++++
 arch/openrisc/include/asm/Kbuild                   |   5 +-
 arch/openrisc/include/asm/cacheflush.h             |  96 ++++++++
 arch/openrisc/include/asm/cmpxchg.h                | 147 +++++++++---
 arch/openrisc/include/asm/cpuinfo.h                |   7 +-
 arch/openrisc/include/asm/mmu_context.h            |   2 +-
 arch/openrisc/include/asm/pgtable.h                |  18 +-
 arch/openrisc/include/asm/serial.h                 |   2 +-
 arch/openrisc/include/asm/smp.h                    |  26 +++
 arch/openrisc/include/asm/spinlock.h               |  12 +-
 arch/openrisc/include/asm/spinlock_types.h         |   7 +
 arch/openrisc/include/asm/spr_defs.h               |  14 ++
 arch/openrisc/include/asm/thread_info.h            |   2 +-
 arch/openrisc/include/asm/time.h                   |  23 ++
 arch/openrisc/include/asm/tlbflush.h               |  25 +-
 arch/openrisc/include/asm/unwinder.h               |  20 ++
 arch/openrisc/kernel/Makefile                      |   4 +-
 arch/openrisc/kernel/dma.c                         |  14 +-
 arch/openrisc/kernel/entry.S                       |  74 +++++-
 arch/openrisc/kernel/head.S                        | 239 ++++++++++++++++---
 arch/openrisc/kernel/setup.c                       | 165 ++++++++-----
 arch/openrisc/kernel/smp.c                         | 259 +++++++++++++++++++++
 arch/openrisc/kernel/stacktrace.c                  |  86 +++++++
 arch/openrisc/kernel/sync-timer.c                  | 120 ++++++++++
 arch/openrisc/kernel/time.c                        |  66 ++++--
 arch/openrisc/kernel/traps.c                       |  54 +----
 arch/openrisc/kernel/unwinder.c                    | 105 +++++++++
 arch/openrisc/lib/delay.c                          |   2 +-
 arch/openrisc/mm/Makefile                          |   2 +-
 arch/openrisc/mm/cache.c                           |  61 +++++
 arch/openrisc/mm/fault.c                           |   4 +-
 arch/openrisc/mm/init.c                            |   2 +-
 arch/openrisc/mm/tlb.c                             |  16 +-
 drivers/irqchip/Kconfig                            |   3 +
 drivers/irqchip/Makefile                           |   1 +
 drivers/irqchip/irq-ompic.c                        | 202 ++++++++++++++++
 46 files changed, 1940 insertions(+), 262 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/interrupt-controller/openrisc,ompic.txt
 create mode 100644 Documentation/devicetree/bindings/openrisc/opencores/or1ksim.txt
 rename arch/openrisc/README.openrisc => Documentation/openrisc/README (56%)
 rename arch/openrisc/TODO.openrisc => Documentation/openrisc/TODO (100%)
 create mode 100644 arch/openrisc/boot/dts/simple_smp.dts
 create mode 100644 arch/openrisc/configs/simple_smp_defconfig
 create mode 100644 arch/openrisc/include/asm/cacheflush.h
 create mode 100644 arch/openrisc/include/asm/smp.h
 create mode 100644 arch/openrisc/include/asm/spinlock_types.h
 create mode 100644 arch/openrisc/include/asm/time.h
 create mode 100644 arch/openrisc/include/asm/unwinder.h
 create mode 100644 arch/openrisc/kernel/smp.c
 create mode 100644 arch/openrisc/kernel/stacktrace.c
 create mode 100644 arch/openrisc/kernel/sync-timer.c
 create mode 100644 arch/openrisc/kernel/unwinder.c
 create mode 100644 arch/openrisc/mm/cache.c
 create mode 100644 drivers/irqchip/irq-ompic.c