Am 20.02.2018 um 12:33 schrieb Daniel Vetter:
> [SNIP]
> Ah, so the ttm_ctx I've spotted was something entirely different and
> doesn't contain the ww_acquire_ctx (I didn't check)? I'd assume you have
> the same ctx passed around to everything in ttm, but if that doesn't exist
> then we can indeed not annotate ww_mutex_trylock_ctx with the right ctx.
Yes, exactly.
I actually tried this approach, e.g. put the ww_acquire_context into the
ttm_operation_context and then use that with ww_mutex_trylock_ctx.
But a) that turned out to be to much hassle, e.g. at least amdgpu
doesn't use a ww_acquire context in most cases.
And b) it actually wasn't what I was looking for, e.g. I couldn't
distinct between the trylocked BOs an everything else any more.
>> [SNIP]
>> But to me it actually looks more like that makes it unnecessary complicated.
>> The use case in amdgpu which could only check the context isn't performance
>> critical.
> Oh I'm not worried about the runtime overhead at all, I'm worried about
> conceptual clarity of this stuff. If you have a ctx there's no need to
> also look at ->owner.
>
> Another idea: We drop the task argument from functions and go with the
> following logic:
>
> ww_mutex_is_owner(lock, ctx)
> {
> if (ctx)
> return lock->ctx == ctx;
> else
> return lock->owner == current;
> }
>
> I think that would solve your use case, and gives us the neat interface
> I'm aiming for. Kerneldoc can then explain what's happening for a NULL
> ctx.
Good point, going to adjust the patches this way and resend.
Christian.
