Quoting Joonas Lahtinen (2018-06-05 10:43:14)
> Quoting Chris Wilson (2018-06-05 10:19:44)
> > The legacy gen6 ppgtt needs a little more hand holding than gen8+, and
> > so requires a larger structure. As I intend to make this slightly more
> > complicated in the future, separate the gen6 from the core gen8 hw
> > struct by subclassing. This patch moves the gen6 only features out to
> > gen6_hw_ppgtt and pipes the new type everywhere that needs it.
> > 
> > Signed-off-by: Chris Wilson <[email protected]>
> > Cc: Joonas Lahtinen <[email protected]>
> > Cc: Mika Kuoppala <[email protected]>
> > Cc: Matthew Auld <[email protected]>
> 
> It's at times confusing when gen6_foo takes either the ppgtt or
> ppgtt->base, but at least compiler will protect from that.

The only consolation is that the number of gen6/i915 switches are reduced
over time. I was trying to keep it as strongly typed as possible with
the minimal of fuss. Hopefully, I struck the right balance (for the
present time, at this point in the series).
-Chris
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