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<section id="opal-message">
<span id="opal-messages"></span><h1>OPAL_MESSAGE<a class="headerlink" href="#opal-message" title="Permalink to this headline">¶</a></h1>
<p>The host OS can use OPAL_GET_MSG to retrive messages queued by OPAL. The
messages are defined by enum opal_msg_type. The host is notified of there
being messages to be consumed by the OPAL_EVENT_MSG_PENDING bit being set.</p>
<p>An opal_msg is:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">struct</span> <span class="n">opal_msg</span> <span class="p">{</span>
<span class="n">__be32</span> <span class="n">msg_type</span><span class="p">;</span>
<span class="n">__be32</span> <span class="n">size</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">params</span><span class="p">[</span><span class="mi">8</span><span class="p">];</span>
<span class="p">};</span>
</pre></div>
</div>
<p>The data structure is ALWAYS at least this size (4+4+8*8 = 72 bytes). Some
messages define fewer than eight parameters. For messages that do not
define all eight parameters, the value in the undefined parameters is
undefined, although can safely be memcpy()d or otherwise moved.</p>
<p>In the device tree, there’s an opal-msg-size property of the OPAL node that
says the size of a struct opal-msg. Kernel will use this property to allocate
memory for opal_msg structure. See <code class="docutils literal notranslate"><span class="pre">OPAL_GET_MESSAGE</span></code> documentation for
details.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">ibm</span><span class="p">,</span><span class="n">opal</span> <span class="p">{</span>
<span class="n">opal</span><span class="o">-</span><span class="n">msg</span><span class="o">-</span><span class="n">size</span> <span class="o">=</span> <span class="o"><</span><span class="mh">0x48</span><span class="o">></span><span class="p">;</span>
<span class="p">}</span>
</pre></div>
</div>
<section id="opal-msg-async-comp">
<h2>OPAL_MSG_ASYNC_COMP<a class="headerlink" href="#opal-msg-async-comp" title="Permalink to this headline">¶</a></h2>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">params</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="n">token</span>
<span class="n">params</span><span class="p">[</span><span class="mi">1</span><span class="p">]</span> <span class="o">=</span> <span class="n">rc</span>
</pre></div>
</div>
<p>Additional parameters are function-specific.</p>
</section>
<section id="opal-msg-mem-err">
<h2>OPAL_MSG_MEM_ERR<a class="headerlink" href="#opal-msg-mem-err" title="Permalink to this headline">¶</a></h2>
</section>
<section id="opal-msg-epow">
<span id="id1"></span><h2>OPAL_MSG_EPOW<a class="headerlink" href="#opal-msg-epow" title="Permalink to this headline">¶</a></h2>
<p>Used by OPAL to issue environmental and power warnings to host OS for
conditions requiring an earlier poweroff. A few examples of these are high
ambient temperature or system running on UPS power with low UPS battery.
Host OS can query OPAL via <a class="reference internal" href="opal-get-epow-status-56.html#opal-get-epow-status"><span class="std std-ref">OPAL_GET_EPOW_STATUS</span></a> API to obtain information about
EPOW conditions present. Refer include/opal-api.h for description of
all supported EPOW events. OPAL_SYSPOWER_CHNG, OPAL_SYSPOWER_FAIL and
OPAL_SYSPOWER_INC events don’t require system poweroff.</p>
<p>Host OS should look for ‘ibm,opal-v3-epow’ string as compatible property
for ‘epow’ node under OPAL device-tree to determine epow support.</p>
</section>
<section id="opal-msg-shutdown">
<h2>OPAL_MSG_SHUTDOWN<a class="headerlink" href="#opal-msg-shutdown" title="Permalink to this headline">¶</a></h2>
<p>Used by OPAL to inform the host OS it must imitate a graceful shutdown. Uses
the first parameter to indicate weather the system is going down for shutdown
or a reboot.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">params</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span> <span class="o">=</span> <span class="mh">0x01</span> <span class="n">reboot</span><span class="p">,</span> <span class="mh">0x00</span> <span class="n">shutdown</span>
</pre></div>
</div>
</section>
<section id="opal-msg-hmi-evt">
<span id="id2"></span><h2>OPAL_MSG_HMI_EVT<a class="headerlink" href="#opal-msg-hmi-evt" title="Permalink to this headline">¶</a></h2>
<p>Used by OPAL to sends the OPAL HMI Event to the host OS that reports a
summary of HMI error and whether it was successfully recovered or not.</p>
<p>HMI is a Hypervisor Maintenance Interrupt usually reports error related
to processor recovery/checkstop, NX checkstop and Timer facility. Hypervisor
then takes this opportunity to analyze and recover from some of these errors.
Hypervisor takes assistance from OPAL layer to handle and recover from
HMI. After handling HMI, OPAL layer sends the summary of error report and
status of recovery action using HMI event structure shown below.</p>
<p>The HMI event structure uses version numbering to allow future enhancement
to accommodate additional members. The version start from V1 onward.
Version 0 is invalid version and unsupported.</p>
<p>The current version of HMI event structure V2 and is backward compatible
to V1 version.</p>
<p>Notes:</p>
<ul class="simple">
<li><p>When adding new structure to the union in future, the version number
must be bumped.</p></li>
<li><p>All future versions must be backward compatible to all its older versions.</p></li>
<li><p>Size of this structure should not exceed that of struct opal_msg.</p></li>
</ul>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">struct</span> <span class="n">OpalHMIEvent</span> <span class="p">{</span>
<span class="n">uint8_t</span> <span class="n">version</span><span class="p">;</span> <span class="o">/*</span> <span class="mh">0x00</span> <span class="o">*/</span>
<span class="n">uint8_t</span> <span class="n">severity</span><span class="p">;</span> <span class="o">/*</span> <span class="mh">0x01</span> <span class="o">*/</span>
<span class="n">uint8_t</span> <span class="nb">type</span><span class="p">;</span> <span class="o">/*</span> <span class="mh">0x02</span> <span class="o">*/</span>
<span class="n">uint8_t</span> <span class="n">disposition</span><span class="p">;</span> <span class="o">/*</span> <span class="mh">0x03</span> <span class="o">*/</span>
<span class="n">uint8_t</span> <span class="n">reserved_1</span><span class="p">[</span><span class="mi">4</span><span class="p">];</span> <span class="o">/*</span> <span class="mh">0x04</span> <span class="o">*/</span>
<span class="n">__be64</span> <span class="n">hmer</span><span class="p">;</span>
<span class="o">/*</span> <span class="n">TFMR</span> <span class="n">register</span><span class="o">.</span> <span class="n">Valid</span> <span class="n">only</span> <span class="k">for</span> <span class="n">TFAC</span> <span class="ow">and</span> <span class="n">TFMR_PARITY</span> <span class="n">error</span> <span class="nb">type</span><span class="o">.</span> <span class="o">*/</span>
<span class="n">__be64</span> <span class="n">tfmr</span><span class="p">;</span>
<span class="o">/*</span> <span class="n">version</span> <span class="mi">2</span> <span class="ow">and</span> <span class="n">later</span> <span class="o">*/</span>
<span class="n">union</span> <span class="p">{</span>
<span class="o">/*</span>
<span class="o">*</span> <span class="n">checkstop</span> <span class="n">info</span> <span class="p">(</span><span class="n">Core</span><span class="o">/</span><span class="n">NX</span><span class="p">)</span><span class="o">.</span>
<span class="o">*</span> <span class="n">Valid</span> <span class="k">for</span> <span class="n">OpalHMI_ERROR_MALFUNC_ALERT</span><span class="o">.</span>
<span class="o">*/</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">uint8_t</span> <span class="n">xstop_type</span><span class="p">;</span> <span class="o">/*</span> <span class="n">enum</span> <span class="n">OpalHMI_XstopType</span> <span class="o">*/</span>
<span class="n">uint8_t</span> <span class="n">reserved_1</span><span class="p">[</span><span class="mi">3</span><span class="p">];</span>
<span class="n">__be32</span> <span class="n">xstop_reason</span><span class="p">;</span>
<span class="n">union</span> <span class="p">{</span>
<span class="n">__be32</span> <span class="n">pir</span><span class="p">;</span> <span class="o">/*</span> <span class="k">for</span> <span class="n">CHECKSTOP_TYPE_CORE</span> <span class="o">*/</span>
<span class="n">__be32</span> <span class="n">chip_id</span><span class="p">;</span> <span class="o">/*</span> <span class="k">for</span> <span class="n">CHECKSTOP_TYPE_NX</span> <span class="o">*/</span>
<span class="p">}</span> <span class="n">u</span><span class="p">;</span>
<span class="p">}</span> <span class="n">xstop_error</span><span class="p">;</span>
<span class="p">}</span> <span class="n">u</span><span class="p">;</span>
<span class="p">};</span>
</pre></div>
</div>
</section>
<section id="opal-msg-dpo">
<span id="id3"></span><h2>OPAL_MSG_DPO<a class="headerlink" href="#opal-msg-dpo" title="Permalink to this headline">¶</a></h2>
<p>Delayed poweroff where OPAL informs host OS that a poweroff has been
requested and a forced shutdown will happen in future. Host OS can use
OPAL_GET_DPO_STATUS API to query OPAL the number of seconds remaining
before a forced poweroff will occur.</p>
</section>
<section id="opal-msg-prd">
<span id="id4"></span><h2>OPAL_MSG_PRD<a class="headerlink" href="#opal-msg-prd" title="Permalink to this headline">¶</a></h2>
<p>This message is a OPAL-to-HBRT notification, and contains a
struct opal_prd_msg:</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="n">enum</span> <span class="n">opal_prd_msg_type</span> <span class="p">{</span>
<span class="n">OPAL_PRD_MSG_TYPE_INIT</span> <span class="o">=</span> <span class="mi">0</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o">--></span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="n">OPAL_PRD_MSG_TYPE_FINI</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o">--></span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="n">OPAL_PRD_MSG_TYPE_ATTN</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o"><--</span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="n">OPAL_PRD_MSG_TYPE_ATTN_ACK</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o">--></span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="n">OPAL_PRD_MSG_TYPE_OCC_ERROR</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o"><--</span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="n">OPAL_PRD_MSG_TYPE_OCC_RESET</span><span class="p">,</span> <span class="o">/*</span> <span class="n">HBRT</span> <span class="o"><--</span> <span class="n">OPAL</span> <span class="o">*/</span>
<span class="p">};</span>
<span class="n">struct</span> <span class="n">opal_prd_msg</span> <span class="p">{</span>
<span class="n">uint8_t</span> <span class="nb">type</span><span class="p">;</span>
<span class="n">uint8_t</span> <span class="n">pad</span><span class="p">[</span><span class="mi">3</span><span class="p">];</span>
<span class="n">__be32</span> <span class="n">token</span><span class="p">;</span>
<span class="n">union</span> <span class="p">{</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="n">version</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">ipoll</span><span class="p">;</span>
<span class="p">}</span> <span class="n">init</span><span class="p">;</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="n">proc</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">ipoll_status</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">ipoll_mask</span><span class="p">;</span>
<span class="p">}</span> <span class="n">attn</span><span class="p">;</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="n">proc</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">ipoll_ack</span><span class="p">;</span>
<span class="p">}</span> <span class="n">attn_ack</span><span class="p">;</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="n">chip</span><span class="p">;</span>
<span class="p">}</span> <span class="n">occ_error</span><span class="p">;</span>
<span class="n">struct</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="n">chip</span><span class="p">;</span>
<span class="p">}</span> <span class="n">occ_reset</span><span class="p">;</span>
<span class="p">};</span>
<span class="p">};</span>
</pre></div>
</div>
<p>Responses from the kernel use the same message format, but are passed
through the <a class="reference internal" href="opal-prd-msg-113.html#opal-prd-msg"><span class="std std-ref">OPAL_PRD_MSG</span></a> call.</p>
</section>
<section id="opal-msg-occ">
<h2>OPAL_MSG_OCC<a class="headerlink" href="#opal-msg-occ" title="Permalink to this headline">¶</a></h2>
<p>This is used by OPAL to inform host about OCC events like OCC reset,
OCC load and throttle status change by OCC which can indicate the
host the reason for frequency throttling/unthrottling.</p>
<div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="c1">#define OCC_RESET 0</span>
<span class="c1">#define OCC_LOAD 1</span>
<span class="c1">#define OCC_THROTTLE 2</span>
<span class="c1">#define OCC_MAX_THROTTLE_STATUS 5</span>
<span class="o">/*</span>
<span class="o">*</span> <span class="n">struct</span> <span class="n">opal_occ_msg</span><span class="p">:</span>
<span class="o">*</span> <span class="nb">type</span><span class="p">:</span> <span class="n">OCC_RESET</span><span class="p">,</span> <span class="n">OCC_LOAD</span><span class="p">,</span> <span class="n">OCC_THROTTLE</span>
<span class="o">*</span> <span class="n">chip</span><span class="p">:</span> <span class="n">chip</span> <span class="nb">id</span>
<span class="o">*</span> <span class="n">throttle</span> <span class="n">status</span><span class="p">:</span> <span class="n">Indicates</span> <span class="n">the</span> <span class="n">reason</span> <span class="n">why</span> <span class="n">OCC</span> <span class="n">may</span> <span class="n">have</span> <span class="n">limited</span>
<span class="o">*</span> <span class="n">the</span> <span class="nb">max</span> <span class="n">Pstate</span> <span class="n">of</span> <span class="n">the</span> <span class="n">chip</span><span class="o">.</span>
<span class="o">*</span> <span class="mh">0x00</span> <span class="o">=</span> <span class="n">No</span> <span class="n">throttle</span>
<span class="o">*</span> <span class="mh">0x01</span> <span class="o">=</span> <span class="n">Power</span> <span class="n">Cap</span>
<span class="o">*</span> <span class="mh">0x02</span> <span class="o">=</span> <span class="n">Processor</span> <span class="n">Over</span> <span class="n">Temperature</span>
<span class="o">*</span> <span class="mh">0x03</span> <span class="o">=</span> <span class="n">Power</span> <span class="n">Supply</span> <span class="n">Failure</span> <span class="p">(</span><span class="n">currently</span> <span class="ow">not</span> <span class="n">used</span><span class="p">)</span>
<span class="o">*</span> <span class="mh">0x04</span> <span class="o">=</span> <span class="n">Over</span> <span class="n">current</span> <span class="p">(</span><span class="n">currently</span> <span class="ow">not</span> <span class="n">used</span><span class="p">)</span>
<span class="o">*</span> <span class="mh">0x05</span> <span class="o">=</span> <span class="n">OCC</span> <span class="n">Reset</span> <span class="p">(</span><span class="ow">not</span> <span class="n">reliable</span> <span class="k">as</span> <span class="n">some</span> <span class="n">failures</span> <span class="n">will</span> <span class="ow">not</span> <span class="n">allow</span> <span class="k">for</span>
<span class="o">*</span> <span class="n">OCC</span> <span class="n">to</span> <span class="n">update</span> <span class="n">throttle</span> <span class="n">status</span><span class="p">)</span>
<span class="o">*/</span>
<span class="n">struct</span> <span class="n">opal_occ_msg</span> <span class="p">{</span>
<span class="n">__be64</span> <span class="nb">type</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">chip</span><span class="p">;</span>
<span class="n">__be64</span> <span class="n">throttle_status</span><span class="p">;</span>
<span class="p">};</span>
</pre></div>
</div>
<p>Host should read opal_occ_msg.chip and opal_occ_msg.throttle_status
only when <code class="docutils literal notranslate"><span class="pre">opal_occ_msg.type</span> <span class="pre">=</span> <span class="pre">OCC_THROTTLE</span></code>.
If host receives <code class="docutils literal notranslate"><span class="pre">OCC_THROTTLE</span></code> after an <code class="docutils literal notranslate"><span class="pre">OCC_RESET</span></code> then this throttle
message will have a special meaning which indicates that all the OCCs
have become active after a reset. In such cases <code class="docutils literal notranslate"><span class="pre">opal_occ_msg.chip</span></code> and
<code class="docutils literal notranslate"><span class="pre">opal_occ_msg.throttle_status</span></code> will be set to 0 and host should not use
these values.</p>
<p>If <code class="docutils literal notranslate"><span class="pre">opal_occ_msg.type</span> <span class="pre">></span> <span class="pre">2</span></code> then host should ignore the message for now,
new events can be defined for <code class="docutils literal notranslate"><span class="pre">opal_occ_msg.type</span></code> in the future versions
of OPAL.</p>
</section>
<section id="opal-msg-prd2">
<h2>OPAL_MSG_PRD2<a class="headerlink" href="#opal-msg-prd2" title="Permalink to this headline">¶</a></h2>
<p>This message is a OPAL-to-HBRT notification. Its same as OPAL_MSG_PRD except
this one supports passing more than 64bytes (8*8) of data.</p>
</section>
</section>
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<li><a class="reference internal" href="#">OPAL_MESSAGE</a><ul>
<li><a class="reference internal" href="#opal-msg-async-comp">OPAL_MSG_ASYNC_COMP</a></li>
<li><a class="reference internal" href="#opal-msg-mem-err">OPAL_MSG_MEM_ERR</a></li>
<li><a class="reference internal" href="#opal-msg-epow">OPAL_MSG_EPOW</a></li>
<li><a class="reference internal" href="#opal-msg-shutdown">OPAL_MSG_SHUTDOWN</a></li>
<li><a class="reference internal" href="#opal-msg-hmi-evt">OPAL_MSG_HMI_EVT</a></li>
<li><a class="reference internal" href="#opal-msg-dpo">OPAL_MSG_DPO</a></li>
<li><a class="reference internal" href="#opal-msg-prd">OPAL_MSG_PRD</a></li>
<li><a class="reference internal" href="#opal-msg-occ">OPAL_MSG_OCC</a></li>
<li><a class="reference internal" href="#opal-msg-prd2">OPAL_MSG_PRD2</a></li>
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