[Bug 91577] [HD Graphics 4000] Segfault accessing rq->bo->handle

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91577

--- Comment #13 from Chris Wilson <chris at chris-wilson.co.uk> ---
Cursor doesn't do anything for me with links in the terminal. Do you mind
sending me the complete debug log, I want to see how we end up 64k buffers? In
the meantime,

commit 69d8edc11173df021aa2e158b2530257113141fd
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Aug 7 10:08:17 2015 +0100

    sna: Handle batch allocation failure

    Whilst we currently do not try and submit a failed batch buffer
    allocation, we still treat it as a valid request. This explodes much
    later when we inspect the NULL rq->bo.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=91577
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

commit 8c465d0fbf84b1d29c54d620f09063d2b7ccfeb8
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Aug 7 10:15:42 2015 +0100

    sna: Fallback after a bo allocation failure for the batch

    If we fail to allocate the next bo to use for the next_request, we can
    just fallback to the delayed allocation used by !llc.

    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=91577
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

commit ca71199679cac9cc161c84cb09d12f133abf8a64
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Fri Aug 7 10:40:30 2015 +0100

    sna: Harden batch allocation against resource starvation

    If the batch allocation fails, retire the oldest request and try again.

    References: https://bugs.freedesktop.org/show_bug.cgi?id=91577
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>

should prevent the allocation failure, or if we can't prevent it, handle it
correctly.

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