[Bug 110998] [gen9] Hang recovery fails for atomic+textureBuffer hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110998

Chris Wilson <chris at chris-wilson.co.uk> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #10 from Chris Wilson <chris at chris-wilson.co.uk> ---
Hang and subsequent death avoided by

commit 9d7b01e93526efe79dbf75b69cc5972b5a4f7b37 (HEAD -> drm-intel-next-queued,
drm-intel/drm-intel-next-queued)
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Wed Sep 4 11:07:07 2019 +0100

    drm/i915: Restore relaxed padding (OCL_OOB_SUPPRES_ENABLE) for skl+

    This bit was fliped on for "syncing dependencies between camera and
    graphics". BSpec has no recollection why, and it is causing
    unrecoverable GPU hangs with Vulkan compute workloads.

    From BSpec, setting bit5 to 0 enables relaxed padding requirements for
    buffers, 1D and 2D non-array, non-MSAA, non-mip-mapped linear surfaces;
    and *must* be set to 0h on skl+ to ensure "Out of Bounds" case is
    suppressed.

    Reported-by: Jason Ekstrand <jason at jlekstrand.net>
    Suggested-by: Jason Ekstrand <jason at jlekstrand.net>
    Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110998
    Fixes: 8424171e135c ("drm/i915/gen9: h/w w/a: syncing dependencies between
camera and graphics")
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Tested-by: denys.kostin at globallogic.com
    Cc: Jason Ekstrand <jason at jlekstrand.net>
    Cc: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Cc: <stable at vger.kernel.org> # v4.1+
    Reviewed-by: Mika Kuoppala <mika.kuoppala at linux.intel.com>
    Link:
https://patchwork.freedesktop.org/patch/msgid/20190904100707.7377-1-chris@chris-wilson.co.uk

Solves the immediate test case.

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