powerpc/eeh: Aux PE data for error log
authorGavin Shan <gwshan@linux.vnet.ibm.com>
Thu, 17 Jul 2014 04:41:43 +0000 (14:41 +1000)
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>
Tue, 5 Aug 2014 05:41:43 +0000 (15:41 +1000)
commitbb593c0049fd6b6e420a6f68c5a688e14782dba1
tree844f038aca08d97c89fb02b8b167f19fea2d141c
parentf18440fb7e4f95d2a8f882d3d27c8777101fac12
powerpc/eeh: Aux PE data for error log

The patch allows PE (struct eeh_pe) instance to have auxillary data,
whose size is configurable on basis of platform. For PowerNV, the
auxillary data will be used to cache PHB diag-data for that PE
(frozen PE or fenced PHB). In turn, we can retrieve the diag-data
at any later points.

It's useful for the case of VFIO PCI devices where the error log
should be cached, and then be retrieved by the guest at later point.
Also, it can avoid PHB diag-data overwritting if another frozen PE
reported and the previous diag-data isn't fetched by guest.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
arch/powerpc/include/asm/eeh.h
arch/powerpc/kernel/eeh_pe.c
arch/powerpc/platforms/powernv/eeh-ioda.c
arch/powerpc/platforms/powernv/eeh-powernv.c