[Intel-gfx] [PATCH] drm/i915: Avoid div-by-zero on gen2

[Chris Wilson]

Quoting Chris Wilson (2021-03-21 16:28:07)
> Quoting Ville Syrjala (2021-03-21 16:10:38)
> > diff --git a/drivers/gpu/drm/i915/gem/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> > index ec28a6cde49b..0b2434e29d00 100644
> > --- a/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> > +++ b/drivers/gpu/drm/i915/gem/i915_gem_mman.c
> > @@ -189,7 +189,7 @@ compute_partial_view(const struct drm_i915_gem_object *obj,
> >         struct i915_ggtt_view view;
> >  
> >         if (i915_gem_object_is_tiled(obj))
> > -               chunk = roundup(chunk, tile_row_pages(obj));
> > +               chunk = roundup(chunk, tile_row_pages(obj) ?: 1);
> 
> I was thinking the answer would be to align to the next page, and hey
> presto!

Wait, the tile row cannot be a single page. Something else is zero that
should not be.
-Chris