[Intel-gfx] [PATCH 40/55] drm/i915: Refactor blocking waits

[Joonas Lahtinen]

On ke, 2016-07-27 at 18:34 +0100, Chris Wilson wrote:
> On Wed, Jul 27, 2016 at 01:42:13PM +0300, Joonas Lahtinen wrote:
> > 
> > On ke, 2016-07-27 at 08:07 +0100, Chris Wilson wrote:
> > > 
> > > > 
> > > >  
> > > > > 
> > > > > +           active = obj->last_read;
> > > > > +           active_mask = obj->active;
> > > > >     } else {
> > > > > -           for (i = 0; i < I915_NUM_ENGINES; i++) {
> > > > > -                   request = i915_gem_active_peek(&obj->last_read[i],
> > > > > -                                                  &obj->base.dev->struct_mutex);
> > > > > -                   if (!request)
> > > > > -                           continue;
> > > > > +           active_mask = 1;
> > > >  
> > > > Wouldn't we have RENDER_RING define for this and other instances?
> > > ?
> > Defining a mask with first bit set is not very informative, is it?
> Just for clarification to the list:
> 
> This doesn't correspond to any engine, but that the array of active[] is
> only of size 1. The first branch iterates over
> last_read[I915_NUM_ENGINES] for which we track the current active_mask.
> The second branch iterates over last_write[1] for which we have no
> shortcut, and so assign the mask the value 1.

Right, now got it.

Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>

Regards, Joonas

> -Chris
> 
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation