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  1. Bug #419264
  2. Comment #36

Comment 36 for bug 419264

Revision history for this message
In , Eric Anholt (eric-anholt) wrote :

pull request sent.

commit a09ba7faf75fa4b21980d81de8e5f3d5c0785ccf
Author: Eric Anholt <email address hidden>
Date: Sat Aug 29 12:49:51 2009 -0700

    drm/i915: Fix CPU-spinning hangs related to fence usage by using an LRU.

    The lack of a proper LRU was partially worked around by taking the fence
    from the object containing the oldest seqno. But if there are multiple
    objects inactive, then they don't have seqnos and the first fence reg
    among them would be chosen. If you were trying to copy data between two
    mappings, this could result in each page fault stealing the fence from
    the other argument, and your application hanging.

    https://bugs.freedesktop.org/show_bug.cgi?id=23566
    https://bugs.freedesktop.org/show_bug.cgi?id=23220
    https://bugs.freedesktop.org/show_bug.cgi?id=23253
    https://bugs.freedesktop.org/show_bug.cgi?id=23366

    Cc: Stable Team <email address hidden>
    Signed-off-by: Eric Anholt <email address hidden>
    Reviewed-by: Jesse Barnes <email address hidden>
    Reviewed-by: Chris Wilson <email address hidden>