[Bug 74022] New: [pnv regression] Hang upon resume

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=74022

          Priority: medium
            Bug ID: 74022
                CC: intel-gfx-bugs at lists.freedesktop.org
          Assignee: intel-gfx-bugs at lists.freedesktop.org
           Summary: [pnv regression] Hang upon resume
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: chris at chris-wilson.co.uk
          Hardware: Other
            Status: NEW
           Version: XOrg CVS
         Component: DRM/Intel
           Product: DRI

Between 3.12 and drm-intel-nightly, we loose coherency after resume.

ring->get_seqno() = 0xffffeffe, but hws[0x20] = 0xfffff001

so the gpu is advancing and writing to the hws page, but the seqno is not
visible by the CPU - the cache snooping is bust. For SNB+, we had a similar
issue which required flushing the ring TLBs.

Bisect in progress.

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