linux-kernel - [PATCH 0/6] openrisc: support for l.lwa and l.swa atomic instructions

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Message-Id: <1406150296-13308-1-git-send-email-stefan.kristiansson@saunalahti.fi>
Date:	Thu, 24 Jul 2014 00:18:10 +0300
From:	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
To:	linux-kernel@...r.kernel.org, linux@...ts.openrisc.net
Cc:	jonas@...thpole.se,
	Stefan Kristiansson <stefan.kristiansson@...nalahti.fi>
Subject: [PATCH 0/6] openrisc: support for l.lwa and l.swa atomic instructions

The latest revision (v1.1-0) of the OpenRISC 1000 architecture
specification [1], adds definitions for load-linked/store-conditional
type of atomic instructions.

There are already a couple of implementations available that has support
for these instructions implemented.
E.g. a hardware implementation - mor1kx and a functional simulator - or1ksim.

This series of patches takes these new instructions into use to create hardware
assisted versions of atomic/bitops/cmpxchg.
It also enables proper support for futexes, something that hasn't been available
previously.

[1] https://github.com/openrisc/doc/blob/master/openrisc-arch-1.1-rev0.pdf?raw=true

Stefan Kristiansson (6):
  openrisc: add Kconfig for l.lwa and l.swa atomic instructions
  openrisc: add atomic bitops
  openrisc: add cmpxchg and xchg implementations
  openrisc: add atomic operations implementations
  openrisc: include l.swa in check for write data pagefault
  openrisc: add futex_atomic_* implementations

 arch/openrisc/Kconfig                     |   7 ++
 arch/openrisc/include/asm/Kbuild          |   4 -
 arch/openrisc/include/asm/atomic.h        |  88 +++++++++++++++++++
 arch/openrisc/include/asm/bitops.h        |   2 +-
 arch/openrisc/include/asm/bitops/atomic.h | 109 +++++++++++++++++++++++
 arch/openrisc/include/asm/cmpxchg.h       |  83 ++++++++++++++++++
 arch/openrisc/include/asm/futex.h         | 140 ++++++++++++++++++++++++++++++
 arch/openrisc/kernel/entry.S              |   2 +-
 8 files changed, 429 insertions(+), 6 deletions(-)
 create mode 100644 arch/openrisc/include/asm/atomic.h
 create mode 100644 arch/openrisc/include/asm/bitops/atomic.h
 create mode 100644 arch/openrisc/include/asm/cmpxchg.h
 create mode 100644 arch/openrisc/include/asm/futex.h

-- 
1.8.3.2

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