drm/i915: Codify our assumption that the Global GTT is <= 4GiB
Throughout the code base, we use u32 for offsets into the global GTT. If we ever see any hardware with a larger GGTT, then we run the real risk of silent corruption. So test for our assumption up front so that we have a nice reminder should the time come when it fails. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com> Cc: Daniel Vetter <daniel@ffwll.ch> Signed-off-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com> [Rebased and changed 1ull -> 1ULL, cut 80 char line] Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> Link: http://patchwork.freedesktop.org/patch/msgid/1458290579-27783-1-git-send-email-joonas.lahtinen@linux.intel.com
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@ -3191,6 +3191,14 @@ int i915_gem_gtt_init(struct drm_device *dev)
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if (ret)
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return ret;
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if ((ggtt->base.total - 1) >> 32) {
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DRM_ERROR("We never expected a Global GTT with more than 32bits"
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"of address space! Found %lldM!\n",
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ggtt->base.total >> 20);
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ggtt->base.total = 1ULL << 32;
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ggtt->mappable_end = min(ggtt->mappable_end, ggtt->base.total);
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}
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/*
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* Initialise stolen early so that we may reserve preallocated
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* objects for the BIOS to KMS transition.
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