[Cbe-oss-dev] [RFC, PATCH 0/2] powerpc/spufs: allow access to scheduled-out NOSCHED contexts

[Kazunori Asayama]

Kazunori Asayama wrote:
> Jeremy Kerr wrote:
>> Currently, we have no way of accessing the "regs" file of SPE contexts
>> created with the SPU_CREATE_NOSCHED flag. This means that libSPE can't
>> set up the initial register set.
>>
>> However, not all access to the register file of a NOSCHED context are
>> invalid - the context may already be saved, or we may not currently
>> be running the context (in which case, it'll be OK to save to the CSA).
>>
>> The following patches allow access to the regs file (as well as other
>> files previously restricted to schedulable contexts), by enabling us
>> to call spu_acquire_saved on NOSCHED contexts. If a NOSCHED context
>> would be descheduled due to this call, it will return with -EBUSY.
> 
> Even with these changes, regular SPE programs with NOSCHED don't work 
> correctly because spu_create ignores the parameter 'npc' for all NOSCHED 
> contexts and execution always starts at 0x0. Is it expected behavior? Or 
> should be fixed?

Oops, not 'spu_create', but 'spu_run'.

-- 
(ASAYAMA Kazunori
   (asayama at sm.sony.co.jp))
t