linux-kernel - [PATCH v2 00/10] xtensa: support coprocessors on SMP

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Date:   Thu, 21 Apr 2022 03:10:23 -0700
From:   Max Filippov <jcmvbkbc@...il.com>
To:     linux-xtensa@...ux-xtensa.org
Cc:     Chris Zankel <chris@...kel.net>, linux-kernel@...r.kernel.org,
        Max Filippov <jcmvbkbc@...il.com>
Subject: [PATCH v2 00/10] xtensa: support coprocessors on SMP

Hello,

this series does a bunch of small cleanups around exception and
coprocessor handling code and adds coprocessors support in SMP
configurations.

Changes v1->v2:

- clean up exception handler prototypes
- merge SAVE_CP_REGS_TAB and LOAD_CP_REGS_TAB
- get rid of stack frame in coprocessor_flush
- document rules for coprocessor context management
- clean up context management from the LKMM point of view, introduce
  and document barriers
- support CPU hotplug

Max Filippov (10):
  xtensa: clean up function declarations in traps.c
  xtensa: clean up exception handler prototypes
  xtensa: clean up declarations in coprocessor.h
  xtensa: clean up excsave1 initialization
  xtensa: use callx0 opcode in fast_coprocessor
  xtensa: handle coprocessor exceptions in kernel mode
  xtensa: add xtensa_xsr macro
  xtensa: merge SAVE_CP_REGS_TAB and LOAD_CP_REGS_TAB
  xtensa: get rid of stack frame in coprocessor_flush
  xtensa: support coprocessors on SMP

 arch/xtensa/include/asm/coprocessor.h |  11 +-
 arch/xtensa/include/asm/processor.h   |   7 +
 arch/xtensa/include/asm/thread_info.h |   7 +-
 arch/xtensa/include/asm/traps.h       |  40 +++--
 arch/xtensa/kernel/asm-offsets.c      |   8 +-
 arch/xtensa/kernel/coprocessor.S      | 230 +++++++++++++++-----------
 arch/xtensa/kernel/entry.S            |  12 +-
 arch/xtensa/kernel/process.c          | 112 ++++++++++---
 arch/xtensa/kernel/ptrace.c           |   3 +-
 arch/xtensa/kernel/s32c1i_selftest.c  |   7 +-
 arch/xtensa/kernel/signal.c           |   3 +-
 arch/xtensa/kernel/smp.c              |   7 +
 arch/xtensa/kernel/traps.c            |  69 ++++----
 13 files changed, 334 insertions(+), 182 deletions(-)

-- 
2.30.2