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drm/i915: Assert that we never create a vma for the aliasing_ppgtt 

The aliasing_ppgtt is just a container for the HW context that mirrors
the global gtt. It should never be used directly, so assert if we make
the mistake of trying to allocate a VMA for it.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170209111933.12420-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
This commit is contained in:
Chris Wilson 2017-02-09 11:19:33 +00:00
parent 969bb72cbf
commit e1cc3db020
1 changed files with 3 additions and 0 deletions
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3
drivers/gpu/drm/i915/i915_vma.c
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@ -78,6 +78,9 @@ vma_create(struct drm_i915_gem_object *obj,
struct rb_node *rb, **p;
int i;
/* The aliasing_ppgtt should never be used directly! */
GEM_BUG_ON(vm == &vm->i915->mm.aliasing_ppgtt->base);
vma = kmem_cache_zalloc(vm->i915->vmas, GFP_KERNEL);
if (vma == NULL)
return ERR_PTR(-ENOMEM);