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RFC: intel/i915: revert memory size reduction regression

Paulo Zanoni requested to merge pzanoni/mesa:unbreak-deathloop into main

I think the big question here is: why does xe.ko slash our RAM in half and why did we choose to make i915.ko do the same instead of the opposite?

Consistency is nice, but I want to be able to, you know, use the RAM I have available.

intel/i915: revert memory size reduction regression

  "We paid for the whole sixteen gigs of RAM, so we gonna use the
   whole sixteen gigs of RAM!".
     - My Mom

This fixes* Deathloop on my 16GB Tiger Lake laptop.

*: fixes as in it makes the game launch so now I can go back to trying
   to fix fixing the visual corruption it shows on TGL.

Fixes: b571ae6e7a76 ("intel: Make memory heaps consistent between KMDs")

Cc: @zehortigoza @llandwerlin

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