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<div class="section" id="virtual-accelerator-switchboard-vas">
<span id="device-tree-vas"></span><h1>Virtual Accelerator Switchboard (VAS)<a class="headerlink" href="#virtual-accelerator-switchboard-vas" title="Permalink to this headline">¶</a></h1>
<p>VAS is present in P9 or later processors. In P9, each chip has one
instance of VAS. Each instance of VAS is represented as a “platform
device” i.e as a node in root of the device tree:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="o">/</span><span class="n">vas</span><span class="o">@<</span><span class="n">vas_addr</span><span class="o">></span>
</pre></div>
</div>
<p>with unique VAS address which also represents the Hypervisor window
context address for the instance of VAS.</p>
<p>Each VAS node contains:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">compatible</span><span class="p">:</span> <span class="s2">"ibm,power9-vas"</span><span class="p">,</span> <span class="s2">"ibm,vas"</span>
<span class="n">ibm</span><span class="p">,</span><span class="n">chip</span><span class="o">-</span><span class="nb">id</span><span class="p">:</span> <span class="n">Chip</span><span class="o">-</span><span class="nb">id</span> <span class="n">of</span> <span class="n">the</span> <span class="n">chip</span> <span class="n">containing</span> <span class="n">this</span> <span class="n">instance</span> <span class="n">of</span> <span class="n">VAS</span><span class="o">.</span>
<span class="n">ibm</span><span class="p">,</span><span class="n">vas</span><span class="o">-</span><span class="nb">id</span><span class="p">:</span> <span class="n">unique</span> <span class="n">identifier</span> <span class="k">for</span> <span class="n">each</span> <span class="n">instance</span> <span class="n">of</span> <span class="n">VAS</span> <span class="ow">in</span> <span class="n">the</span> <span class="n">system</span><span class="o">.</span>
<span class="n">ibm</span><span class="p">,</span><span class="n">vas</span><span class="o">-</span><span class="n">port</span><span class="p">:</span> <span class="n">Port</span> <span class="n">address</span> <span class="k">for</span> <span class="n">the</span> <span class="n">interrupt</span><span class="o">.</span>
<span class="n">interrupts</span><span class="p">:</span> <span class="o"><</span><span class="n">IRQ</span><span class="c1"># level> for this VAS instance.</span>
<span class="n">interrupt</span><span class="o">-</span><span class="n">parent</span><span class="p">:</span> <span class="n">Interrupt</span> <span class="n">controller</span> <span class="n">phandle</span><span class="o">.</span>
<span class="n">reg</span><span class="p">:</span> <span class="n">contains</span> <span class="mi">8</span> <span class="mi">64</span><span class="o">-</span><span class="n">bit</span> <span class="n">fields</span><span class="o">.</span>
<span class="n">Fields</span> <span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="ow">and</span> <span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="n">represent</span> <span class="n">the</span> <span class="n">Hypervisor</span> <span class="n">window</span> <span class="n">context</span> <span class="n">BAR</span>
<span class="p">(</span><span class="n">start</span> <span class="ow">and</span> <span class="n">length</span><span class="p">)</span><span class="o">.</span> <span class="n">Fields</span> <span class="p">[</span><span class="mi">2</span><span class="p">]</span> <span class="ow">and</span> <span class="p">[</span><span class="mi">3</span><span class="p">]</span> <span class="n">represent</span> <span class="n">the</span> <span class="n">OS</span><span class="o">/</span><span class="n">User</span>
<span class="n">window</span> <span class="n">context</span> <span class="n">BAR</span> <span class="p">(</span><span class="n">start</span> <span class="ow">and</span> <span class="n">length</span><span class="p">)</span><span class="o">.</span> <span class="n">Fields</span> <span class="p">[</span><span class="mi">4</span><span class="p">]</span> <span class="ow">and</span> <span class="p">[</span><span class="mi">5</span><span class="p">]</span>
<span class="n">contain</span> <span class="n">the</span> <span class="n">start</span> <span class="ow">and</span> <span class="n">length</span> <span class="n">of</span> <span class="n">paste</span> <span class="n">power</span> <span class="n">bus</span> <span class="n">address</span> <span class="n">region</span>
<span class="k">for</span> <span class="n">this</span> <span class="n">chip</span><span class="o">.</span> <span class="n">Fields</span> <span class="p">[</span><span class="mi">6</span><span class="p">]</span> <span class="ow">and</span> <span class="p">[</span><span class="mi">7</span><span class="p">]</span> <span class="n">represent</span> <span class="n">the</span> <span class="n">bit</span> <span class="n">field</span> <span class="p">(</span><span class="n">start</span>
<span class="n">bit</span> <span class="ow">and</span> <span class="n">number</span> <span class="n">of</span> <span class="n">bits</span><span class="p">)</span> <span class="n">where</span> <span class="n">the</span> <span class="n">window</span> <span class="nb">id</span> <span class="n">of</span> <span class="n">the</span> <span class="n">window</span> <span class="n">should</span>
<span class="n">be</span> <span class="n">encoded</span> <span class="n">when</span> <span class="n">computing</span> <span class="n">the</span> <span class="n">paste</span> <span class="n">address</span> <span class="k">for</span> <span class="n">the</span> <span class="n">window</span><span class="o">.</span>
</pre></div>
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