[PATCH v2 0/2] OPAL message log interface

Joel Stanley joel at jms.id.au
Tue Apr 1 14:58:18 EST 2014

These two patches add support for the message log, and expose a new OPAL call
called opal_invalid that allow me to cause OPAL to inject messages into the

The naming is a bit mixed, as our device tree node is opal-memcons and I
retained the naming of the header structure 'struct memcons', but all other
references are to the OPAL message log.

They have been tested on a POWER7+ machine running some recent firmware.

Changes in V2:

The guts of the function used to read the console has been reworked. In doing
so, I've addressed the comments from Mikey and Ben:

 - Added barrier between reading header and data
 - Only read out_pos once
 - Check the return code before adding it to the number of bytes read

Unlike V1, this version correctly reads out a wrapped buffer.

Joel Stanley (2):
  powerpc/powernv: Add OPAL message log interface
  powerpc/powernv: Add invalid OPAL call

 arch/powerpc/include/asm/opal.h                |   6 ++
 arch/powerpc/platforms/powernv/Makefile        |   1 +
 arch/powerpc/platforms/powernv/opal-msglog.c   | 120 +++++++++++++++++++++++++
 arch/powerpc/platforms/powernv/opal-wrappers.S |   1 +
 arch/powerpc/platforms/powernv/opal.c          |   7 +-
 5 files changed, 134 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/platforms/powernv/opal-msglog.c


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