If we setup backing phys page for 3lvl pdps, even they
are not used, we lose 5 pages per ppgtt.
Trading this memory on bsw, we gain more common code paths for all
gen8+ directory manipulation. And those paths are now void of checks
for page directory type, making the hot paths faster.
v2: don't s
Quoting Mika Kuoppala (2019-06-18 17:17:31)
> If we setup backing phys page for 3lvl pdps, even they
even though they
> are not used, we lose 5 pages per ppgtt.
>
> Trading this memory on bsw, we gain more common code paths for all
> gen8+ directory m
If we setup backing phys page for 3lvl pdps, even they
are not used, we lose 5 pages per ppgtt.
Trading this memory on bsw, we gain more common code paths for all
gen8+ directory manipulation. And those paths are now void of checks
for page directory type, making the hot paths faster.
Signed-off-
