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| <section id="power9-changes-to-opal-api"> |
| <h1>POWER9 Changes to OPAL API<a class="headerlink" href="#power9-changes-to-opal-api" title="Link to this heading">¶</a></h1> |
| <p>This document is a summary of POWER9 changes to the OPAL API over what it |
| was for POWER7 and POWER8. As the POWER series of processors (at least up |
| to POWER9) require changes in the hypervisor to work on a new processor |
| generation, this gives us an opportunity with POWER9 to clean up several |
| parts of the OPAL API.</p> |
| <p>Eventually, when the kernel drops support for POWER8 and before, we can then |
| remove the associated kernel code too.</p> |
| <section id="opal-reinit-cpus"> |
| <h2>OPAL_REINIT_CPUS<a class="headerlink" href="#opal-reinit-cpus" title="Link to this heading">¶</a></h2> |
| <p>Can now be extended beyond HILE BE/LE bits. If invalid flags are set on |
| POWER9, OPAL_UNSUPPORTED will be returned.</p> |
| </section> |
| <section id="device-tree"> |
| <h2>Device Tree<a class="headerlink" href="#device-tree" title="Link to this heading">¶</a></h2> |
| <ul class="simple"> |
| <li><p><code class="docutils literal notranslate"><span class="pre">/ibm,opal/</span></code> compatible property now just lists <code class="docutils literal notranslate"><span class="pre">ibm,opal-v3</span></code> and no longer <code class="docutils literal notranslate"><span class="pre">ibm,opal-v2</span></code> (power9 and above only)</p></li> |
| <li><p>Use only <code class="docutils literal notranslate"><span class="pre">stdout-path</span></code> property from POWER9 and above as usage of <code class="docutils literal notranslate"><span class="pre">linux,stdout-path</span></code> is deprecated</p></li> |
| <li><p>Rename <code class="docutils literal notranslate"><span class="pre">fsp-ipl-side</span></code> as <code class="docutils literal notranslate"><span class="pre">sp-ipl-side</span></code> in <code class="docutils literal notranslate"><span class="pre">/ipl-params</span></code></p></li> |
| <li><p>Add interrupt-parent property for <code class="docutils literal notranslate"><span class="pre">/ibm,opal/ipmi</span></code> node on POWER9 and above |
| to make use of OPAL irqchip rather than event interface in linux.</p></li> |
| </ul> |
| </section> |
| <section id="todo"> |
| <h2>TODO<a class="headerlink" href="#todo" title="Link to this heading">¶</a></h2> |
| <p>Things we still have to do for POWER9:</p> |
| <ul> |
| <li><p>PCI to use async API rather than returning delays</p></li> |
| <li><p>deprecate/remove v1 APIs where there’s a V2</p></li> |
| <li><p>Fix this FWTS warning:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">FAILED</span> <span class="p">[</span><span class="n">MEDIUM</span><span class="p">]</span> <span class="n">DeviceTreeBaseDTCWarnings</span><span class="p">:</span> <span class="n">Test</span> <span class="mi">3</span><span class="p">,</span> <span class="n">dtc</span> <span class="n">reports</span> <span class="n">warnings</span> <span class="kn">from</span> |
| <span class="nn">device</span> <span class="n">tree</span><span class="p">:</span> <span class="ne">Warning</span> <span class="p">(</span><span class="n">reg_format</span><span class="p">):</span> <span class="s2">"reg"</span> <span class="nb">property</span> <span class="ow">in</span> <span class="o">/</span><span class="n">ibm</span><span class="p">,</span><span class="n">opal</span><span class="o">/</span><span class="n">flash</span><span class="o">@</span><span class="mi">0</span> <span class="n">has</span> |
| <span class="n">invalid</span> <span class="n">length</span> <span class="p">(</span><span class="mi">8</span> <span class="nb">bytes</span><span class="p">)</span> <span class="p">(</span><span class="c1">#address-cells == 0, #size-cells == 0)</span> |
| </pre></div> |
| </div> |
| </li> |
| <li><p>Remove mi-version / ml-version from <code class="docutils literal notranslate"><span class="pre">/ibm,opal/firmware</span></code> and replace with something better and more portable</p></li> |
| </ul> |
| </section> |
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| <li><a class="reference internal" href="#">POWER9 Changes to OPAL API</a><ul> |
| <li><a class="reference internal" href="#opal-reinit-cpus">OPAL_REINIT_CPUS</a></li> |
| <li><a class="reference internal" href="#device-tree">Device Tree</a></li> |
| <li><a class="reference internal" href="#todo">TODO</a></li> |
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