[Bug 96584] New: [regression] [i915] DMAR Errors Spamming Logs

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=96584

            Bug ID: 96584
           Summary: [regression] [i915] DMAR Errors Spamming Logs
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: minor
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: mike at fireburn.co.uk
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi

My dmesg is now filled with:

DMAR: DRHD: handling fault status reg 3
DMAR: DMAR:[DMA Read] Request device [00:02.0] fault addr fbff0000 
DMAR:[fault reason 06] PTE Read access is not set

It seems to only happen when before X starts and during shutdown

I've bisected it down to:

975f7ff42edfbad53d65ad63a4f3e7ada8c7538f is the first bad commit
commit 975f7ff42edfbad53d65ad63a4f3e7ada8c7538f
Author: Chris Wilson <chris at chris-wilson.co.uk>
Date:   Sat May 14 07:26:34 2016 +0100

    drm/i915: Lazily migrate the objects after hibernation

    Now that we mark the object domains for having been restored from the
    hibernation image, we not need to flush everything during resume and
    can instead rely on the normal domain tracking to flush only when
    required. The only caveat here are objects that are pinned for use by
    the hardware, whose contents must be coherent for when the device
    resumes reading from then (shortly afterwards with the driver assuming
    the objects are in the correct domain).

    References: https://bugs.freedesktop.org/show_bug.cgi?id=94722
    Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
    Cc: Imre Deak <imre.deak at intel.com>
    Cc: David Weinehall <david.weinehall at intel.com>
    Reviewed-by: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
    Tested-by: David Weinehall <david.weinehall at intel.com>
    Link:
http://patchwork.freedesktop.org/patch/msgid/1463207195-22076-3-git-send-email-chris@chris-wilson.co.uk

:040000 040000 336a603f6bd03d205632a4e131f771638c8b65b0
91bebf7c1f376c76ef92e6e1a7ddc14d674378ee M      drivers

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