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It consist of associated P-state. +</p> +</li> +<li> +<p> +Domain frequencies – Sub-table in vP-state entry table consisting of limits for domain frequencies. +</p> +</li> +</ul></div> +<div class="paragraph"><p>The vP-state table is a part of BIOS information table’s (BIT) Performance table entry (ID = ‘P’ i.e. 0x50 and version = 2) +and its location is extracted by reading 32 bit dword from an offset 0x38 from the performance table (refer to <a href="#_sample_code">sample code</a>).</p></div> +<div class="sect2"> +<h3 id="_virtual_p_state_table_version">Virtual P-state Table Version</h3> +<div class="paragraph"><p>This document describes vP-state table version 1.0 which is supported only on GPU families GF11X through GM20X +(i.e. NVC0 through NV110 families as per nouveau’s code names).</p></div> +<div class="admonitionblock"> +<table><tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content">Table version and structure will change in Pascal and later GPUs.</td> +</tr></table> +</div> +</div> +<div class="sect2"> +<h3 id="_virtual_p_state_table_header_structure">Virtual P-state Table Header Structure</h3> +<div class="tableblock"> +<table rules="all" +width="100%" +frame="border" +cellspacing="0" cellpadding="4"> +<col width="28%" /> +<col width="2%" /> +<col width="68%" /> +<thead> +<tr> +<th align="left" valign="top"> Name </th> +<th align="right" valign="top"> Bit width </th> +<th align="left" valign="top"> Meaning and (Values)</th> +</tr> +</thead> +<tbody> +<tr> +<td align="left" valign="top"><p class="table">Version</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Virtual P-state Table Version (0x10)</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Header Size</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Size of Virtual P-state Table Header in bytes (20)</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Base Entry Size</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Size of Virtual P-state Table Entry in bytes, not including the domain frequencies (5)</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Domain Freq Size</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Size of each Virtual P-state Domain Frequency Entry in bytes (2)</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Domain Freq Count</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Number of Virtual P-state Domain Frequencies allocated</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Entry Count</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Number of Virtual P-state Table Entries</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Reserved</p></td> +<td align="right" valign="top"><p class="table">88</p></td> +<td align="left" valign="top"><p class="table"></p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Index of Rated TDP vP-state (Base Clock)</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">Fastest thermally sustainable vP-state for the TDP app on worst case silicon, worst case conditions (also known as base clock)</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Reserved</p></td> +<td align="right" valign="top"><p class="table">40</p></td> +<td align="left" valign="top"><p class="table"></p></td> +</tr> +</tbody> +</table> +</div> +</div> +<div class="sect2"> +<h3 id="_virtual_p_state_table_entry_structure">Virtual P-state Table Entry Structure</h3> +<div class="tableblock"> +<table rules="all" +width="100%" +frame="border" +cellspacing="0" cellpadding="4"> +<col width="28%" /> +<col width="2%" /> +<col width="68%" /> +<thead> +<tr> +<th align="left" valign="top"> Name </th> +<th align="right" valign="top"> Bit width </th> +<th align="left" valign="top"> Values and Meaning</th> +</tr> +</thead> +<tbody> +<tr> +<td align="left" valign="top"><p class="table">P-state</p></td> +<td align="right" valign="top"><p class="table">8</p></td> +<td align="left" valign="top"><p class="table">P-state associated with this vP-state. A value of 0xff indicates SKIP ENTRY.</p></td> +</tr> +<tr> +<td align="left" valign="top"><p class="table">Reserved</p></td> +<td align="right" valign="top"><p class="table">32</p></td> +<td align="left" valign="top"><p class="table"></p></td> +</tr> +</tbody> +</table> +</div> +</div> +<div class="sect2"> +<h3 id="_virtual_p_state_domain_frequency_entry_structure">Virtual P-state Domain Frequency Entry Structure</h3> +<div class="paragraph"><p>This is a sub-table in Virtual P-state Table Entry. Domain frequency entries are indexed as per clock domain enumeration.</p></div> +<div class="tableblock"> +<table rules="all" +width="100%" +frame="border" +cellspacing="0" cellpadding="4"> +<col width="28%" /> +<col width="2%" /> +<col width="68%" /> +<thead> +<tr> +<th align="left" valign="top"> Name </th> +<th align="right" valign="top"> Bit width </th> +<th align="left" valign="top"> Values and Meaning</th> +</tr> +</thead> +<tbody> +<tr> +<td align="left" valign="top"><p class="table">Domain Frequency</p></td> +<td align="right" valign="top"><p class="table">16</p></td> +<td align="left" valign="top"><p class="table">Domain frequency associated with this vP-state in MHz. A value of 0 indicates that vP-states do not specify a limit for this domain.</p></td> +</tr> +</tbody> +</table> +</div> +<div class="paragraph"><p>It is safe to assume that there will always be one domain frequency entry per vP-state table entry. Non-zero value of this entry belongs to GPC clock domain.</p></div> +</div> +</div> +</div> +<div class="sect1"> +<h2 id="_sample_code">Sample code</h2> +<div class="sectionbody"> +<div class="paragraph"><p>Sample code to read base clock from vP-state table.</p></div> +<div class="admonitionblock"> +<table><tr> +<td class="icon"> +<div class="title">Note</div> +</td> +<td class="content">this code is based on nouveau driver which is capable of reading various entries from BIT.</td> +</tr></table> +</div> +<div class="listingblock"> +<div class="content"><!-- Generator: GNU source-highlight 3.1.6 +by Lorenzo Bettini +http://www.lorenzobettini.it +http://www.gnu.org/software/src-highlite --> +<pre><tt><span style="color: #000000"> 1:</span> void <span style="font-weight: bold"><span style="color: #000000">read_vpstate_table</span></span><span style="color: #990000">(</span>struct nvkm_bios <span style="color: #990000">*</span>bios<span style="color: #990000">)</span> +<span style="color: #000000"> 2:</span> <span style="color: #990000">{</span> +<span style="color: #000000"> 3:</span> struct bit_entry bit_P<span style="color: #990000">;</span> +<span style="color: #000000"> 4:</span> u16 vpstate_tbl <span style="color: #990000">=</span> <span style="color: #993399">0x0000</span><span style="color: #990000">,</span> offset<span style="color: #990000">,</span> domain_clk<span style="color: #990000">;</span> +<span style="color: #000000"> 5:</span> u8 ver<span style="color: #990000">,</span> i<span style="color: #990000">,</span> hdr_size<span style="color: #990000">,</span> base_entry_size<span style="color: #990000">,</span> domain_freq_size<span style="color: #990000">,</span> domain_freq_count<span style="color: #990000">,</span> base_clk_idx<span style="color: #990000">;</span> +<span style="color: #000000"> 6:</span> +<span style="color: #000000"> 7:</span> <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(!</span><span style="font-weight: bold"><span style="color: #000000">bit_entry</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> <span style="color: #FF0000">'P'</span><span style="color: #990000">,</span> <span style="color: #990000">&</span>bit_P<span style="color: #990000">))</span> <span style="color: #990000">{</span> +<span style="color: #000000"> 8:</span> <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>bit_P<span style="color: #990000">.</span>version <span style="color: #990000">==</span> <span style="color: #993399">2</span><span style="color: #990000">)</span> +<span style="color: #000000"> 9:</span> vpstate_tbl <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd16</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> bit_P<span style="color: #990000">.</span>offset <span style="color: #990000">+</span> <span style="color: #993399">0x38</span><span style="color: #990000">);</span> +<span style="color: #000000"> 10:</span> <span style="font-weight: bold"><span style="color: #0000FF">else</span></span> +<span style="color: #000000"> 11:</span> <span style="font-weight: bold"><span style="color: #0000FF">return</span></span><span style="color: #990000">;</span> +<span style="color: #000000"> 12:</span> +<span style="color: #000000"> 13:</span> <span style="font-weight: bold"><span style="color: #0000FF">if</span></span> <span style="color: #990000">(</span>vpstate_tbl<span style="color: #990000">)</span> <span style="color: #990000">{</span> +<span style="color: #000000"> 14:</span> ver <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">0</span><span style="color: #990000">);</span> +<span style="color: #000000"> 15:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"vP-state entry version = 0x%x\n"</span><span style="color: #990000">,</span> ver<span style="color: #990000">);</span> +<span style="color: #000000"> 16:</span> <span style="font-weight: bold"><span style="color: #000000">switch</span></span> <span style="color: #990000">(</span>ver<span style="color: #990000">)</span> <span style="color: #990000">{</span> +<span style="color: #000000"> 17:</span> case <span style="color: #993399">0x10</span><span style="color: #990000">:</span> +<span style="color: #000000"> 18:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"vP-state header size = %d\n"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 19:</span> hdr_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">1</span><span style="color: #990000">));</span> +<span style="color: #000000"> 20:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"base entry size = %d\n"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 21:</span> base_entry_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">2</span><span style="color: #990000">));</span> +<span style="color: #000000"> 22:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"domain freq entry size = %d\n"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 23:</span> domain_freq_size <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">3</span><span style="color: #990000">));</span> +<span style="color: #000000"> 24:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"domain freq entries count = %d\n"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 25:</span> domain_freq_count <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">4</span><span style="color: #990000">));</span> +<span style="color: #000000"> 26:</span> +<span style="color: #000000"> 27:</span> +<span style="color: #000000"> 28:</span> base_clk_idx <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> vpstate_tbl <span style="color: #990000">+</span> <span style="color: #993399">17</span><span style="color: #990000">);</span> +<span style="color: #000000"> 29:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"base clk index = %d\n"</span><span style="color: #990000">,</span> base_clk_idx<span style="color: #990000">);</span> +<span style="color: #000000"> 30:</span> +<span style="color: #000000"> 31:</span> +<span style="color: #000000"> 32:</span> offset <span style="color: #990000">=</span> vpstate <span style="color: #990000">+</span> hdr_size <span style="color: #990000">+</span> +<span style="color: #000000"> 33:</span> <span style="color: #990000">((</span>base_entry_size <span style="color: #990000">+</span> <span style="color: #990000">(</span>domain_freq_size <span style="color: #990000">*</span> domain_freq_count<span style="color: #990000">))</span> <span style="color: #990000">*</span> base_clk<span style="color: #990000">);</span> +<span style="color: #000000"> 34:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"offset = %d\n"</span><span style="color: #990000">,</span> offset<span style="color: #990000">);</span> +<span style="color: #000000"> 35:</span> +<span style="color: #000000"> 36:</span> +<span style="color: #000000"> 37:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"p-state for base clk = %d"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 38:</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd08</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> offset <span style="color: #990000">+</span> <span style="color: #993399">0</span><span style="color: #990000">));</span> +<span style="color: #000000"> 39:</span> +<span style="color: #000000"> 40:</span> <span style="font-weight: bold"><span style="color: #0000FF">for</span></span> <span style="color: #990000">(</span>i <span style="color: #990000">=</span> <span style="color: #993399">0</span><span style="color: #990000">;</span> i <span style="color: #990000"><</span> domain_freq_count<span style="color: #990000">;</span> i<span style="color: #990000">++)</span> <span style="color: #990000">{</span> +<span style="color: #000000"> 41:</span> domain_clk <span style="color: #990000">=</span> <span style="font-weight: bold"><span style="color: #000000">nvbios_rd16</span></span><span style="color: #990000">(</span>bios<span style="color: #990000">,</span> offset <span style="color: #990000">+</span> base_entry_size <span style="color: #990000">+</span> +<span style="color: #000000"> 42:</span> <span style="color: #990000">(</span>i <span style="color: #990000">*</span> domain_freq_size<span style="color: #990000">));</span> +<span style="color: #000000"> 43:</span> <span style="font-weight: bold"><span style="color: #000000">printk</span></span><span style="color: #990000">(</span><span style="color: #FF0000">"domain clock index = %d, domain clock limit value = %d MHz\n"</span><span style="color: #990000">,</span> +<span style="color: #000000"> 44:</span> i<span style="color: #990000">,</span> domain_clk<span style="color: #990000">);</span> +<span style="color: #000000"> 45:</span> <span style="color: #990000">}</span> +<span style="color: #000000"> 46:</span> +<span style="color: #000000"> 47:</span> <span style="font-weight: bold"><span style="color: #0000FF">return</span></span><span style="color: #990000">;</span> +<span style="color: #000000"> 48:</span> default<span style="color: #990000">:</span> +<span style="color: #000000"> 49:</span> <span style="font-weight: bold"><span style="color: #0000FF">return</span></span><span style="color: #990000">;</span> +<span style="color: #000000"> 50:</span> <span style="color: #990000">}</span> +<span style="color: #000000"> 51:</span> <span style="color: #990000">}</span> +<span style="color: #000000"> 52:</span> <span style="color: #990000">}</span> +<span style="color: #000000"> 53:</span> +<span style="color: #000000"> 54:</span> <span style="font-weight: bold"><span style="color: #0000FF">return</span></span><span style="color: #990000">;</span> +<span style="color: #000000"> 55:</span> <span style="color: #990000">}</span></tt></pre></div></div> +</div> +</div> +</div> +<div id="footnotes"><hr /></div> +<div id="footer"> +<div id="footer-text"> +Last updated 2016-03-28 +</div> +</div> +</body> +</html> |