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    <body><span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span> changed
          <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT] igt@i915_selftest@live_hangcheck - dmesg-fail - failed to complete request after reset"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110683">bug 110683</a>
          <br>
             <table border="1" cellspacing="0" cellpadding="8">
          <tr>
            <th>What</th>
            <th>Removed</th>
            <th>Added</th>
          </tr>

         <tr>
           <td style="text-align:right;">Status</td>
           <td>NEW
           </td>
           <td>RESOLVED
           </td>
         </tr>

         <tr>
           <td style="text-align:right;">Resolution</td>
           <td>---
           </td>
           <td>FIXED
           </td>
         </tr></table>
      <p>
        <div>
            <b><a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT] igt@i915_selftest@live_hangcheck - dmesg-fail - failed to complete request after reset"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110683#c6">Comment # 6</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][BAT] igt@i915_selftest@live_hangcheck - dmesg-fail - failed to complete request after reset"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110683">bug 110683</a>
              from <span class="vcard"><a class="email" href="mailto:chris@chris-wilson.co.uk" title="Chris Wilson <chris@chris-wilson.co.uk>"> <span class="fn">Chris Wilson</span></a>
</span></b>
        <pre>commit c30d5dc653cbc78f9b634b7b72e25057a68c527c (HEAD -> drm-intel-next-queued,
drm-intel/for-linux-next, drm-intel/drm-intel-next-queued)
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date:   Tue Jul 16 13:49:28 2019 +0100

    drm/i915/gt: Push engine stopping into reset-prepare

    Push the engine stop into the back reset_prepare (where it already was!)
    This allows us to avoid dangerously setting the RING registers to 0 for
    logical contexts. If we clear the register on a live context, those
    invalid register values are recorded in the logical context state and
    replayed (with hilarious results).

    Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Reviewed-by: Tvrtko Ursulin <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>>
    Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-2-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-2-chris@chris-wilson.co.uk</a>

commit fff8102aaed59014cb2d8034bdca231185496b16
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date:   Tue Jul 16 13:49:29 2019 +0100

    drm/i915/execlists: Process interrupted context on reset

    By stopping the rings, we may trigger an arbitration point resulting in
    a premature context-switch (i.e. a completion event before the request
    is actually complete). This clears the active context before the reset,
    but we must remember to rewind the incomplete context for replay upon
    resume.

    Fixes: 1863e3020ab5 ("drm/i915/execlists: Always reset the context's RING
registers")
    Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Cc: Mika Kuoppala <<a href="mailto:mika.kuoppala@linux.intel.com">mika.kuoppala@linux.intel.com</a>>
    Reviewed-by: Tvrtko Ursulin <<a href="mailto:tvrtko.ursulin@intel.com">tvrtko.ursulin@intel.com</a>>
    Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-3-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20190716124931.5870-3-chris@chris-wilson.co.uk</a>

Hopefully. The mystery of STOP_RING persisting over reset remains, but I expect
that to be mere noise; an incidental HW detail (unless it means that the reset
itself didn't happen...)</pre>
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