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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][DRMTIP]igt@gem_*|igt@prime_mmap_coherency@ioctl-errors - dmesg-warn - WARNING: possible circular locking dependency detected"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110527">bug 110527</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][DRMTIP]igt@gem_*|igt@prime_mmap_coherency@ioctl-errors - dmesg-warn - WARNING: possible circular locking dependency detected"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110527#c4">Comment # 4</a>
              on <a class="bz_bug_link 
          bz_status_RESOLVED  bz_closed"
   title="RESOLVED FIXED - [CI][DRMTIP]igt@gem_*|igt@prime_mmap_coherency@ioctl-errors - dmesg-warn - WARNING: possible circular locking dependency detected"
   href="https://bugs.freedesktop.org/show_bug.cgi?id=110527">bug 110527</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 ebb5eb7d731cc39e29661e0eb9dfe61242817663
Author: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
Date:   Fri Apr 26 09:17:21 2019 +0100

    drm/i915: Replace pcu_lock with sb_lock

    We now have two locks for sideband access. The general one covering
    sideband access across all generation, sb_lock, and a specific one
    covering sideband access via the punit on vlv/chv. After lifting the
    sb_lock around the punit into the callers, the pcu_lock is now redudant
    and can be separated from its other use to regulate RPS (essentially
    giving RPS a lock all of its own).

    v2: Extract a couple of minor bug fixes.

    Signed-off-by: Chris Wilson <<a href="mailto:chris@chris-wilson.co.uk">chris@chris-wilson.co.uk</a>>
    Reviewed-by: Sagar Arun Kamble <<a href="mailto:sagar.a.kamble@intel.com">sagar.a.kamble@intel.com</a>>
    Link:
<a href="https://patchwork.freedesktop.org/patch/msgid/20190426081725.31217-4-chris@chris-wilson.co.uk">https://patchwork.freedesktop.org/patch/msgid/20190426081725.31217-4-chris@chris-wilson.co.uk</a></pre>
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