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| <section id="skiboot-6-2-1"> |
| <span id="id1"></span><h1>skiboot-6.2.1<a class="headerlink" href="#skiboot-6-2-1" title="Link to this heading">¶</a></h1> |
| <p>skiboot 6.2.1 was released on Wednesday February 20th, 2019. It replaces |
| <a class="reference internal" href="skiboot-6.2.html#skiboot-6-2"><span class="std std-ref">skiboot-6.2</span></a> as the current stable release in the 6.2.x series.</p> |
| <p>It is recommended that 6.2.1 be used instead of any previous 6.2.x version |
| due to the bug fixes it contains.</p> |
| <p>Bug fixes included in this release are:</p> |
| <ul> |
| <li><p>libflash/ecc: Fix compilation warning with gcc9</p> |
| <p>Fixes: <a class="reference external" href="https://github.com/open-power/skiboot/issues/218">https://github.com/open-power/skiboot/issues/218</a></p> |
| </li> |
| <li><p>core/opal: Print PIR value in exit path, useful for debugging</p></li> |
| <li><p>core/ipmi: Improve error message</p></li> |
| <li><p>firmware-versions: Add test case for parsing VERSION</p> |
| <p>If we hit a entry in VERSION that is larger than our |
| buffer size, we skip over it gracefully rather than overwriting the |
| stack. This is only a problem if VERSION isn’t trusted, which as of |
| 4b8cc05a94513816d43fb8bd6178896b430af08f it is verified as part of |
| Secure Boot.</p> |
| </li> |
| <li><p>core/cpu: HID update race</p> |
| <p>If the per-core HID register is updated concurrently by multiple |
| threads, updates can get lost. This has been observed during fast |
| reboot where the HILE bit does not get cleared on all cores, which |
| can cause machine check exception interrupts to crash.</p> |
| <p>Fix this by only updating HID on thread0.</p> |
| </li> |
| <li><p>cpufeatures: Always advertise POWER8NVL as DD2</p> |
| <p>Despite the major version of PVR being 1 (0x004c0100) for POWER8NVL, |
| these chips are functionally equalent to P8/P8E DD2 levels.</p> |
| <p>This advertises POWER8NVL as DD2. As the result, skiboot adds |
| ibm,powerpc-cpu-features/processor-control-facility for such CPUs and |
| the linux kernel can use hypervisor doorbell messages to wake secondary |
| threads; otherwise “KVM: CPU %d seems to be stuck” would appear because |
| of missing LPCR_PECEDH.</p> |
| </li> |
| <li><p>p9dsu: Fix p9dsu slot tables</p> |
| <p>Set the attributes on the slot tables to account for |
| builtin or pluggable etypes, this will allow pci |
| enumeration to calculate subordinate buses.</p> |
| <p>Update some slot label strings.</p> |
| <p>Add WIO Slot5 which is standard on the ESS config.</p> |
| </li> |
| <li><p>core/lock: Stop drop_my_locks() from always causing abort</p> |
| <p>The loop in drop_my_locks() looks like this:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="k">while</span><span class="p">((</span><span class="n">l</span> <span class="o">=</span> <span class="n">list_pop</span><span class="p">(</span><span class="o">&</span><span class="n">this_cpu</span><span class="p">()</span><span class="o">-></span><span class="n">locks_held</span><span class="p">,</span> <span class="n">struct</span> <span class="n">lock</span><span class="p">,</span> <span class="nb">list</span><span class="p">))</span> <span class="o">!=</span> <span class="n">NULL</span><span class="p">)</span> <span class="p">{</span> |
| <span class="k">if</span> <span class="p">(</span><span class="n">warn</span><span class="p">)</span> |
| <span class="n">prlog</span><span class="p">(</span><span class="n">PR_ERR</span><span class="p">,</span> <span class="s2">" </span><span class="si">%s</span><span class="se">\n</span><span class="s2">"</span><span class="p">,</span> <span class="n">l</span><span class="o">-></span><span class="n">owner</span><span class="p">);</span> |
| <span class="n">unlock</span><span class="p">(</span><span class="n">l</span><span class="p">);</span> |
| <span class="p">}</span> |
| </pre></div> |
| </div> |
| <p>Both list_pop() and unlock() call list_del(). This means that on the |
| last iteration of the loop, the list will be empty when we get to |
| unlock_check(), causing this:</p> |
| <div class="highlight-default notranslate"><div class="highlight"><pre><span></span>LOCK ERROR: Releasing lock we don't hold depth @0x30493d20 (state: 0x0000000000000001) |
| [13836.000173140,0] Aborting! |
| CPU 0000 Backtrace: |
| S: 0000000031c03930 R: 000000003001d840 ._abort+0x60 |
| S: 0000000031c039c0 R: 000000003001a0c4 .lock_error+0x64 |
| S: 0000000031c03a50 R: 0000000030019c70 .unlock+0x54 |
| S: 0000000031c03af0 R: 000000003001a040 .drop_my_locks+0xf4 |
| </pre></div> |
| </div> |
| <p>To fix this, change list_pop() to list_top().</p> |
| </li> |
| <li><p>p9dsu: Fix p9dsu default variant</p> |
| <p>Add the default when no riser_id is returned from the ipmi query.</p> |
| <p>Allow a little more time for BMC reply and cleanup some label strings.</p> |
| </li> |
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