[Skiboot] [RFC PATCH] powerpc/powernv: report error messages from opal

[Michael Ellerman]

Stewart Smith <stewart at linux.vnet.ibm.com> writes:
> Oliver O'Halloran <oohall at gmail.com> writes:
>> diff --git a/arch/powerpc/include/asm/opal-api.h b/arch/powerpc/include/asm/opal-api.h
>> index 0e2e57bcab50..cb9c0e6afb33 100644
>> --- a/arch/powerpc/include/asm/opal-api.h
>> +++ b/arch/powerpc/include/asm/opal-api.h
>> @@ -167,7 +167,8 @@
>>  #define OPAL_INT_EOI				124
>>  #define OPAL_INT_SET_MFRR			125
>>  #define OPAL_PCI_TCE_KILL			126
>> -#define OPAL_LAST				126
>> +#define OPAL_SCRAPE_LOG				128
>
> (another thought, along with the skiboot thoughts), I don't like the
> SCRAPE_LOG name so much, as it's more of a "hey linux, here's some log
> messages from firmware, possibly before you were
> involved"... OPAL_FETCH_LOG ?

I'm not a huge fan of an interrupt followed by an opal call just to
fetch a single line of log.

Can't we do something more like the existing msglog code, where we have
a ring buffer and then the interrupt just becomes "hey Linux you should
look at your ring buffer".

cheers