[Bug 99948] [BDW] igt_ppgtt_shrink, OOPS gen8_ppgtt_insert_4lvl

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99948

--- Comment #4 from Chris Wilson <chris at chris-wilson.co.uk> ---
and

diff --git a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
index 8e33a8bde78a..187444c37bbb 100644
--- a/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/selftests/i915_gem_gtt.c
@@ -62,12 +62,14 @@ fake_get_pages(struct drm_i915_gem_object *obj)
        for (sg = pages->sgl; sg; sg = sg_next(sg)) {
                unsigned long len = min_t(typeof(rem), rem, BIT(31));

+               GEM_BUG_ON(!len);
                sg_set_page(sg, pfn_to_page(PFN_BIAS), len, 0);
                sg_dma_address(sg) = page_to_phys(sg_page(sg));
                sg_dma_len(sg) = len;

                rem -= len;
        }
+       GEM_BUG_ON(rem);

        obj->mm.madv = I915_MADV_DONTNEED;
        return pages;

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