Commit 8f5e2b30 authored Sep 02, 2019 by Chris Wilson

drm/i915: Restrict the aliasing-ppgtt to the size of the ggtt



The aliasing-ppgtt is not allowed to be smaller than the ggtt, nor
should we advertise it as being any bigger, or else we may get sued for
false advertisement.

Testcase: igt/gem_exec_big
Fixes: 0b718ba1 ("drm/i915/gtt: Downgrade Cherryview back to aliasing-ppgtt")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190902040303.14195-1-chris@chris-wilson.co.uk

parent 9e362992

drivers/gpu/drm/i915/i915_gem_gtt.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -2597,6 +2597,8 @@ static int init_aliasing_ppgtt(struct i915_ggtt *ggtt)
		GEM_BUG_ON(ggtt->vm.vma_ops.unbind_vma != ggtt_unbind_vma);
		ggtt->vm.vma_ops.unbind_vma = aliasing_gtt_unbind_vma;

		ppgtt->vm.total = ggtt->vm.total;

		return 0;

		err_ppgtt:

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