[Bug 90603] GPU crash dump (Asus Notebook, Intel GMA 4500)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=90603

--- Comment #1 from Chris Wilson <chris at chris-wilson.co.uk> ---
Any other symptoms? That gpu error should have been non-fatal and I believe is
finally fixed by


commit 983d308cb8f602d1920a8c40196eb2ab6cc07bd2
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Mon Jan 26 10:47:10 2015 +0000

    agp/intel: Serialise after GTT updates

    An interesting bug occurs on Pineview through which the root cause is
    that the writes of the PTE values into the GTT is not serialised with
    subsequent memory access through the GTT (when using WC updates of the
    PTE values). This is despite there being a posting read after the GTT
    update. However, by changing the address of the posting read, the memory
    access is indeed serialised correctly.

    Whilst we are manipulating the memory barriers, we can remove the
    compiler :memory restraint on the intermediate PTE writes knowing that
    we explicitly perform a posting read afterwards.

    v2: Replace posting reads with explicit write memory barriers - in
    particular this is advantages in case of single page objects. Update
    comments to mention this issue is only with WC writes.

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