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powerpc/mce: Hookup derror (load/store) UE errors

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Extract physical_address for UE errors by walking the page
tables for the mm and address at the NIP, to extract the
instruction. Then use the instruction to find the effective
address via analyse_instr().

We might have page table walking races, but we expect them to
be rare, the physical address extraction is best effort. The idea
is to then hook up this infrastructure to memory failure eventually.

Signed-off-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Balbir Singh 2017-09-29 14:26:53 +10:00 • committed by Michael Ellerman
parent 81b61fa7a0
commit ba41e1e1cc
5 changed files with 94 additions and 8 deletions
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5
arch/powerpc/include/asm/exception-64s.h
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@ -54,6 +54,11 @@
#define EX_SIZE 9 /* size in u64 units */
#endif
/*
* maximum recursive depth of MCE exceptions
*/
#define MAX_MCE_DEPTH 4
/*
* EX_LR is only used in EXSLB and where it does not overlap with EX_DAR
* EX_CCR similarly with DSISR, but being 4 byte registers there is a hole