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<td width="35%" class="headerValue"><a href="../../index.html">top level</a> - <a href="index.html">external/trace</a> - trace.c<span style="font-size: 80%;"> (source / <a href="trace.c.func-sort-c.html">functions</a>)</span></td>
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<td class="headerValue">skiboot.info</td>
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<td class="headerItem">Lines:</td>
<td class="headerCovTableEntry">39</td>
<td class="headerCovTableEntry">39</td>
<td class="headerCovTableEntryHi">100.0 %</td>
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<td class="headerItem">Date:</td>
<td class="headerValue">2023-06-06 19:00:36</td>
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<td class="headerItem">Functions:</td>
<td class="headerCovTableEntry">2</td>
<td class="headerCovTableEntry">2</td>
<td class="headerCovTableEntryHi">100.0 %</td>
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<pre class="sourceHeading"> Branch data Line data Source code</pre>
<pre class="source">
<a name="1"><span class="lineNum"> 1 </span> : : // SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later</a>
<a name="2"><span class="lineNum"> 2 </span> : : /*</a>
<a name="3"><span class="lineNum"> 3 </span> : : * This example code shows how to read from the trace buffer.</a>
<a name="4"><span class="lineNum"> 4 </span> : : *</a>
<a name="5"><span class="lineNum"> 5 </span> : : * Copyright 2013-2019 IBM Corp.</a>
<a name="6"><span class="lineNum"> 6 </span> : : */</a>
<a name="7"><span class="lineNum"> 7 </span> : : </a>
<a name="8"><span class="lineNum"> 8 </span> : : #include <external/trace/trace.h></a>
<a name="9"><span class="lineNum"> 9 </span> : : #include "../ccan/endian/endian.h"</a>
<a name="10"><span class="lineNum"> 10 </span> : : #include "../ccan/short_types/short_types.h"</a>
<a name="11"><span class="lineNum"> 11 </span> : : #include "trace.h"</a>
<a name="12"><span class="lineNum"> 12 </span> : : #include <trace_types.h></a>
<a name="13"><span class="lineNum"> 13 </span> : : #include <errno.h></a>
<a name="14"><span class="lineNum"> 14 </span> : : </a>
<a name="15"><span class="lineNum"> 15 </span> : : #if defined(__powerpc__) || defined(__powerpc64__)</a>
<a name="16"><span class="lineNum"> 16 </span> : : #define rmb() lwsync()</a>
<a name="17"><span class="lineNum"> 17 </span> : : #else</a>
<a name="18"><span class="lineNum"> 18 </span> : : #define rmb()</a>
<a name="19"><span class="lineNum"> 19 </span> : : #endif</a>
<a name="20"><span class="lineNum"> 20 </span> : : </a>
<a name="21"><span class="lineNum"> 21 </span> :<span class="lineCov"> 4009237 : bool trace_empty(const struct trace_reader *tr)</span></a>
<a name="22"><span class="lineNum"> 22 </span> : : {</a>
<a name="23"><span class="lineNum"> 23 </span> : : const struct trace_repeat *rep;</a>
<a name="24"><span class="lineNum"> 24 </span> : : </a>
<a name="25"><span class="lineNum"> 25 </span> :<span class="lineCov"> 4009237 : if (tr->rpos == be64_to_cpu(tr->tb->end))</span></a>
<a name="26"><span class="lineNum"> 26 </span> :<span class="lineCov"> 3342 : return true;</span></a>
<a name="27"><span class="lineNum"> 27 </span> : : </a>
<a name="28"><span class="lineNum"> 28 </span> : : /*</a>
<a name="29"><span class="lineNum"> 29 </span> : : * If we have a single element only, and it's a repeat buffer</a>
<a name="30"><span class="lineNum"> 30 </span> : : * we've already seen every repeat for (yet which may be</a>
<a name="31"><span class="lineNum"> 31 </span> : : * incremented in future), we're also empty.</a>
<a name="32"><span class="lineNum"> 32 </span> : : */</a>
<a name="33"><span class="lineNum"> 33 </span> :<span class="lineCov"> 4005895 : rep = (void *)tr->tb->buf + tr->rpos % be64_to_cpu(tr->tb->buf_size);</span></a>
<a name="34"><span class="lineNum"> 34 </span> :<span class="lineCov"> 4005895 : if (be64_to_cpu(tr->tb->end) != tr->rpos + sizeof(*rep))</span></a>
<a name="35"><span class="lineNum"> 35 </span> :<span class="lineCov"> 1913038 : return false;</span></a>
<a name="36"><span class="lineNum"> 36 </span> : : </a>
<a name="37"><span class="lineNum"> 37 </span> :<span class="lineCov"> 2092857 : if (rep->type != TRACE_REPEAT)</span></a>
<a name="38"><span class="lineNum"> 38 </span> :<span class="lineCov"> 8 : return false;</span></a>
<a name="39"><span class="lineNum"> 39 </span> : : </a>
<a name="40"><span class="lineNum"> 40 </span> :<span class="lineCov"> 2092849 : if (be16_to_cpu(rep->num) != tr->last_repeat)</span></a>
<a name="41"><span class="lineNum"> 41 </span> :<span class="lineCov"> 1046425 : return false;</span></a>
<a name="42"><span class="lineNum"> 42 </span> : : </a>
<a name="43"><span class="lineNum"> 43 </span> :<span class="lineCov"> 1046424 : return true;</span></a>
<a name="44"><span class="lineNum"> 44 </span> : : }</a>
<a name="45"><span class="lineNum"> 45 </span> : : </a>
<a name="46"><span class="lineNum"> 46 </span> : : /* You can't read in parallel, so some locking required in caller. */</a>
<a name="47"><span class="lineNum"> 47 </span> :<span class="lineCov"> 4009233 : bool trace_get(union trace *t, struct trace_reader *tr)</span></a>
<a name="48"><span class="lineNum"> 48 </span> : : {</a>
<a name="49"><span class="lineNum"> 49 </span> : : u64 start, rpos;</a>
<a name="50"><span class="lineNum"> 50 </span> : : size_t len;</a>
<a name="51"><span class="lineNum"> 51 </span> : : </a>
<a name="52"><span class="lineNum"> 52 </span> :<span class="lineCov"> 8018466 : len = sizeof(*t) < be32_to_cpu(tr->tb->max_size) ? sizeof(*t) :</span></a>
<a name="53"><span class="lineNum"> 53 </span> :<span class="lineCov"> 4009233 : be32_to_cpu(tr->tb->max_size);</span></a>
<a name="54"><span class="lineNum"> 54 </span> : : </a>
<a name="55"><span class="lineNum"> 55 </span> :<span class="lineCov"> 4009233 : if (trace_empty(tr))</span></a>
<a name="56"><span class="lineNum"> 56 </span> :<span class="lineCov"> 1049762 : return false;</span></a>
<a name="57"><span class="lineNum"> 57 </span> : : </a>
<a name="58"><span class="lineNum"> 58 </span> :<span class="lineCov"> 2959471 : again:</span></a>
<a name="59"><span class="lineNum"> 59 </span> : : /*</a>
<a name="60"><span class="lineNum"> 60 </span> : : * The actual buffer is slightly larger than tbsize, so this</a>
<a name="61"><span class="lineNum"> 61 </span> : : * memcpy is always valid.</a>
<a name="62"><span class="lineNum"> 62 </span> : : */</a>
<a name="63"><span class="lineNum"> 63 </span> :<span class="lineCov"> 3666447 : memcpy(t, tr->tb->buf + tr->rpos % be64_to_cpu(tr->tb->buf_size), len);</span></a>
<a name="64"><span class="lineNum"> 64 </span> : : </a>
<a name="65"><span class="lineNum"> 65 </span> : : rmb(); /* read barrier, so we read tr->tb->start after copying record. */</a>
<a name="66"><span class="lineNum"> 66 </span> : : </a>
<a name="67"><span class="lineNum"> 67 </span> :<span class="lineCov"> 3666447 : start = be64_to_cpu(tr->tb->start);</span></a>
<a name="68"><span class="lineNum"> 68 </span> :<span class="lineCov"> 3666447 : rpos = tr->rpos;</span></a>
<a name="69"><span class="lineNum"> 69 </span> : : </a>
<a name="70"><span class="lineNum"> 70 </span> : : /* Now, was that overwritten? */</a>
<a name="71"><span class="lineNum"> 71 </span> :<span class="lineCov"> 3666447 : if (rpos < start) {</span></a>
<a name="72"><span class="lineNum"> 72 </span> : : /* Create overflow record. */</a>
<a name="73"><span class="lineNum"> 73 </span> :<span class="lineCov"> 36 : t->overflow.unused64 = 0;</span></a>
<a name="74"><span class="lineNum"> 74 </span> :<span class="lineCov"> 36 : t->overflow.type = TRACE_OVERFLOW;</span></a>
<a name="75"><span class="lineNum"> 75 </span> :<span class="lineCov"> 36 : t->overflow.len_div_8 = sizeof(t->overflow) / 8;</span></a>
<a name="76"><span class="lineNum"> 76 </span> :<span class="lineCov"> 36 : t->overflow.bytes_missed = cpu_to_be64(start - rpos);</span></a>
<a name="77"><span class="lineNum"> 77 </span> :<span class="lineCov"> 36 : tr->rpos = start;</span></a>
<a name="78"><span class="lineNum"> 78 </span> :<span class="lineCov"> 36 : return true;</span></a>
<a name="79"><span class="lineNum"> 79 </span> : : }</a>
<a name="80"><span class="lineNum"> 80 </span> : : </a>
<a name="81"><span class="lineNum"> 81 </span> : : /* Repeat entries need special handling */</a>
<a name="82"><span class="lineNum"> 82 </span> :<span class="lineCov"> 3666411 : if (t->hdr.type == TRACE_REPEAT) {</span></a>
<a name="83"><span class="lineNum"> 83 </span> :<span class="lineCov"> 2460363 : u32 num = be16_to_cpu(t->repeat.num);</span></a>
<a name="84"><span class="lineNum"> 84 </span> : : </a>
<a name="85"><span class="lineNum"> 85 </span> : : /* In case we've read some already... */</a>
<a name="86"><span class="lineNum"> 86 </span> :<span class="lineCov"> 2460363 : t->repeat.num = cpu_to_be16(num - tr->last_repeat);</span></a>
<a name="87"><span class="lineNum"> 87 </span> : : </a>
<a name="88"><span class="lineNum"> 88 </span> : : /* Record how many repeats we saw this time. */</a>
<a name="89"><span class="lineNum"> 89 </span> :<span class="lineCov"> 2460363 : tr->last_repeat = num;</span></a>
<a name="90"><span class="lineNum"> 90 </span> : : </a>
<a name="91"><span class="lineNum"> 91 </span> : : /* Don't report an empty repeat buffer. */</a>
<a name="92"><span class="lineNum"> 92 </span> :<span class="lineCov"> 2460363 : if (t->repeat.num == 0) {</span></a>
<a name="93"><span class="lineNum"> 93 </span> : : /*</a>
<a name="94"><span class="lineNum"> 94 </span> : : * This can't be the last buffer, otherwise</a>
<a name="95"><span class="lineNum"> 95 </span> : : * trace_empty would have returned true.</a>
<a name="96"><span class="lineNum"> 96 </span> : : */</a>
<a name="97"><span class="lineNum"> 97 </span> :<span class="lineCov"> 706976 : assert(be64_to_cpu(tr->tb->end) ></span></a>
<a name="98"><span class="lineNum"> 98 </span> : : rpos + t->hdr.len_div_8 * 8);</a>
<a name="99"><span class="lineNum"> 99 </span> : : /* Skip to next entry. */</a>
<a name="100"><span class="lineNum"> 100 </span> :<span class="lineCov"> 706976 : tr->rpos = rpos + t->hdr.len_div_8 * 8;</span></a>
<a name="101"><span class="lineNum"> 101 </span> :<span class="lineCov"> 706976 : tr->last_repeat = 0;</span></a>
<a name="102"><span class="lineNum"> 102 </span> :<span class="lineCov"> 706976 : goto again;</span></a>
<a name="103"><span class="lineNum"> 103 </span> : : }</a>
<a name="104"><span class="lineNum"> 104 </span> : : } else {</a>
<a name="105"><span class="lineNum"> 105 </span> :<span class="lineCov"> 1206048 : tr->last_repeat = 0;</span></a>
<a name="106"><span class="lineNum"> 106 </span> :<span class="lineCov"> 1206048 : tr->rpos = rpos + t->hdr.len_div_8 * 8;</span></a>
<a name="107"><span class="lineNum"> 107 </span> : : }</a>
<a name="108"><span class="lineNum"> 108 </span> : : </a>
<a name="109"><span class="lineNum"> 109 </span> :<span class="lineCov"> 2959435 : return true;</span></a>
<a name="110"><span class="lineNum"> 110 </span> : : }</a>
</pre>
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