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<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'>We are using the MPC8572 running SMP Linux 2.6.23 kernel. Having
problems reliably recovering from core_fault_in which is generated by the PCIe 2
Controller (RC) on reception of UR/CA messages. The PCIe Controller has error detection
and interrupts turned on in PEX_ERR_XX registers. Also, AER capability is
enabled via controller configuration space. The ISR handler which performs recovery
action uses the following epilog: if the ISR is running on the same core (0 or
1) from which the failed PCIe transaction was made, it increments NIP by 4 and
exits. If the core is different, the ISR sends an IPI message to the
other core which in its turn does all chores and then recovers the execution in
a similar way, i.e., it bumps NIP by 4 and exits. The code works well
when running on core 0; however, the moment it switches to core 1, it always generates
a kernel paging error:<o:p></o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'>[ 77.169436] Unable to handle kernel paging
request for data at address 0x00000080<br>
[ 77.176899] Faulting instruction address: 0xc0006d94<br>
[ 77.181850] Oops: Kernel access of bad area, sig: 11 [#1]<o:p></o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'>Anyone has any idea why Core 1 chokes on the code which Core
0 runs flawlessly? Is there a known problem with 2.6.23 kernel? Should
I be concern with L1/L2 icache state?<o:p></o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'>Any pointers would be greatly appreciated!<o:p></o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'>Thanks in advance…<o:p></o:p></span></font></p>
<p class=MsoNormal><font face=Arial size=2><span style='font-size:10.0pt;
font-family:Arial'><o:p> </o:p></span></font></p>
<p class=section1 style='margin-bottom:12.0pt'><strong><b><font face=Arial size=1><span style='font-size:7.5pt;font-family:Arial'>Boris Reifman</span></font></b></strong><font face=Arial size=1><span style='font-size:7.5pt;font-family:Arial'> <font color=red><span style='color:red'>|</span></font> <font color=gray><span style='color:gray'>Principal Engineer P&T</span></font><br>
<u><font color=blue><span style='color:blue'><a href="mailto:breifman@ciena.com">breifman@ciena.com</a></span></font></u>
<font color=red><span style='color:red'>|</span></font><font color=purple><span style='color:purple'> </span></font><st1:Street w:st="on"><st1:address w:st="on"><font color=gray><span style='color:gray'>1185 Sanctuary Parkway, Suite 300</span></font></st1:address></st1:Street><font color=gray><span style='color:gray'> </span></font><font color=red><span style='color:red'>|</span></font><font color=purple><span style='color:purple'> </span></font><st1:place w:st="on"><st1:City w:st="on"><font color=gray><span style='color:gray'>Alpharetta</span></font></st1:City><font color=gray><span style='color:gray'>, <st1:State w:st="on">GA</st1:State> <st1:PostalCode w:st="on">30009</st1:PostalCode> <st1:country>USA</st1:country></span></font></st1:place><br>
<font color=gray><span style='color:gray'>Direct +1.678.867.3323 </span></font><font color=red><span style='color:red'>|</span></font><font color=gray><span style='color:gray'> </span></font></span></font><st1:place w:st="on"><st1:City w:st="on"><font color=gray face=Arial size=1><span style='font-size:7.5pt;
font-family:Arial;color:gray'>Mobile</span></font></st1:City></st1:place><font color=gray face=Arial size=1><span style='font-size:7.5pt;font-family:Arial;
color:gray'> +1.770.851.3440 </span></font><font color=red face=Arial size=1><span style='font-size:7.5pt;font-family:Arial;color:red'>|</span></font><font color=gray face=Arial size=1><span style='font-size:7.5pt;font-family:Arial;
color:gray'> </span></font><font color=gray face=Arial size=1><span style='font-size:7.5pt;font-family:Arial;color:gray'>Fax +1.678.867.5101</span></font><font color=gray face=Arial size=1><span style='font-size:7.5pt;font-family:Arial;
color:gray'><o:p></o:p></span></font></p>
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12.0pt'><o:p> </o:p></span></font></p>
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