[Intel-gfx] [PATCH] drm/i915: Check intel_contexts to avoid one extra pointer chase

[Chris Wilson]

Quoting Mika Kuoppala (2018-06-01 11:05:18)
> Chris Wilson <chris at chris-wilson.co.uk> writes:
> 
> > As we store the intel_context on the request (rq->hw_context), we can
> > simply compare that against the local intel_context for the
> > i915->kernel_context rather than using the rq->gem_context.
> >
> > Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
> > Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
> > ---
> >  drivers/gpu/drm/i915/i915_gem_context.c | 2 +-
> >  1 file changed, 1 insertion(+), 1 deletion(-)
> >
> > diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
> > index 81f086397d10..94e4db1870aa 100644
> > --- a/drivers/gpu/drm/i915/i915_gem_context.c
> > +++ b/drivers/gpu/drm/i915/i915_gem_context.c
> > @@ -610,7 +610,7 @@ static bool engine_has_kernel_context_barrier(struct intel_engine_cs *engine)
> >  
> >               any_active = true;
> >  
> > -             if (rq->gem_context == i915->kernel_context)
> > +             if (rq->hw_context == ce)
> 
> We lose a little bit of readability due to that 'ce'.
> But the function is compact enough so that it shows it's
> nature in one eyeful. Tho you could introduce 'kec' :)

kce; almost but ce is being used everywhere else so I hope the
familiarity will make it easier.

Not that ce is a great shorthand for intel_context; so if you have a
good idea for that, as I plan to make them more prevalent that would be
useful.
-Chris