€•œH      Œsphinx.addnodes”Œdocument”“”)”}”(Œ	rawsource”Œ ”Œchildren”]”(Œtranslations”ŒLanguagesNode”“”)”}”(hhh]”(h Œpending_xref”“”)”}”(hhh]”Œdocutils.nodes”ŒText”“”ŒChinese (Simplified)”…””}”Œparent”hsbaŒ
attributes”}”(Œids”]”Œclasses”]”Œnames”]”Œdupnames”]”Œbackrefs”]”Œ	refdomain”Œstd”Œreftype”Œdoc”Œ	reftarget”Œ"/translations/zh_CN/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuŒtagname”hhhubh)”}”(hhh]”hŒChinese (Traditional)”…””}”hh2sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ"/translations/zh_TW/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒItalian”…””}”hhFsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ"/translations/it_IT/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒJapanese”…””}”hhZsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ"/translations/ja_JP/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒKorean”…””}”hhnsbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ"/translations/ko_KR/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubh)”}”(hhh]”hŒSpanish”…””}”hh‚sbah}”(h]”h ]”h"]”h$]”h&]”Œ	refdomain”h)Œreftype”h+Œ	reftarget”Œ"/translations/sp_SP/watchdog/hpwdt”Œmodname”NŒ	classname”NŒrefexplicit”ˆuh1hhhubeh}”(h]”h ]”h"]”h$]”h&]”Œcurrent_language”ŒEnglish”uh1h
hhŒ	_document”hŒsource”NŒline”NubhŒsection”“”)”}”(hhh]”(hŒtitle”“”)”}”(hŒHPE iLO NMI Watchdog Driver”h]”hŒHPE iLO NMI Watchdog Driver”…””}”(hh¨hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh£hžhhŸŒ</var/lib/git/docbuild/linux/Documentation/watchdog/hpwdt.rst”h Kubh¢)”}”(hhh]”(h§)”}”(hŒfor iLO based ProLiant Servers”h]”hŒfor iLO based ProLiant Servers”…””}”(hhºhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1h¦hh·hžhhŸh¶h KubhŒ	paragraph”“”)”}”(hŒLast reviewed: 08/20/2018”h]”hŒLast reviewed: 08/20/2018”…””}”(hhÊhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khh·hžhubhŒblock_quote”“”)”}”(hXŸ  The HPE iLO NMI Watchdog driver is a kernel module that provides basic
watchdog functionality and handler for the iLO "Generate NMI to System"
virtual button.

All references to iLO in this document imply it also works on iLO2 and all
subsequent generations.

Watchdog functionality is enabled like any other common watchdog driver. That
is, an application needs to be started that kicks off the watchdog timer. A
basic application exists in tools/testing/selftests/watchdog/ named
watchdog-test.c. Simply compile the C file and kick it off. If the system
gets into a bad state and hangs, the HPE ProLiant iLO timer register will
not be updated in a timely fashion and a hardware system reset (also known as
an Automatic Server Recovery (ASR)) event will occur.

The hpwdt driver also has the following module parameters:

============  ================================================================
soft_margin   allows the user to set the watchdog timer value.
              Default value is 30 seconds.
timeout       an alias of soft_margin.
pretimeout    allows the user to set the watchdog pretimeout value.
              This is the number of seconds before timeout when an
              NMI is delivered to the system. Setting the value to
              zero disables the pretimeout NMI.
              Default value is 9 seconds.
nowayout      basic watchdog parameter that does not allow the timer to
              be restarted or an impending ASR to be escaped.
              Default value is set when compiling the kernel. If it is set
              to "Y", then there is no way of disabling the watchdog once
              it has been started.
kdumptimeout  Minimum timeout in seconds to apply upon receipt of an NMI
              before calling panic. (-1) disables the watchdog.  When value
              is > 0, the timer is reprogrammed with the greater of
              value or current timeout value.
============  ================================================================

NOTE:
      More information about watchdog drivers in general, including the ioctl
      interface to /dev/watchdog can be found in
      Documentation/watchdog/watchdog-api.rst and Documentation/driver-api/ipmi.rst

Due to limitations in the iLO hardware, the NMI pretimeout if enabled,
can only be set to 9 seconds.  Attempts to set pretimeout to other
non-zero values will be rounded, possibly to zero.  Users should verify
the pretimeout value after attempting to set pretimeout or timeout.

Upon receipt of an NMI from the iLO, the hpwdt driver will initiate a
panic. This is to allow for a crash dump to be collected.  It is incumbent
upon the user to have properly configured the system for kdump.

The default Linux kernel behavior upon panic is to print a kernel tombstone
and loop forever.  This is generally not what a watchdog user wants.

For those wishing to learn more please see:
       - Documentation/admin-guide/kdump/kdump.rst
       - Documentation/admin-guide/kernel-parameters.txt (panic=)
       - Your Linux Distribution specific documentation.

If the hpwdt does not receive the NMI associated with an expiring timer,
the iLO will proceed to reset the system at timeout if the timer hasn't
been updated.
”h]”(hÉ)”}”(hŒžThe HPE iLO NMI Watchdog driver is a kernel module that provides basic
watchdog functionality and handler for the iLO "Generate NMI to System"
virtual button.”h]”hŒ¢The HPE iLO NMI Watchdog driver is a kernel module that provides basic
watchdog functionality and handler for the iLO â€œGenerate NMI to Systemâ€
virtual button.”…””}”(hhÞhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhhÚubhÉ)”}”(hŒbAll references to iLO in this document imply it also works on iLO2 and all
subsequent generations.”h]”hŒbAll references to iLO in this document imply it also works on iLO2 and all
subsequent generations.”…””}”(hhìhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhhÚubhÉ)”}”(hXõ  Watchdog functionality is enabled like any other common watchdog driver. That
is, an application needs to be started that kicks off the watchdog timer. A
basic application exists in tools/testing/selftests/watchdog/ named
watchdog-test.c. Simply compile the C file and kick it off. If the system
gets into a bad state and hangs, the HPE ProLiant iLO timer register will
not be updated in a timely fashion and a hardware system reset (also known as
an Automatic Server Recovery (ASR)) event will occur.”h]”hXõ  Watchdog functionality is enabled like any other common watchdog driver. That
is, an application needs to be started that kicks off the watchdog timer. A
basic application exists in tools/testing/selftests/watchdog/ named
watchdog-test.c. Simply compile the C file and kick it off. If the system
gets into a bad state and hangs, the HPE ProLiant iLO timer register will
not be updated in a timely fashion and a hardware system reset (also known as
an Automatic Server Recovery (ASR)) event will occur.”…””}”(hhúhžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhhÚubhÉ)”}”(hŒ:The hpwdt driver also has the following module parameters:”h]”hŒ:The hpwdt driver also has the following module parameters:”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhhÚubhŒtable”“”)”}”(hhh]”hŒtgroup”“”)”}”(hhh]”(hŒcolspec”“”)”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”Kuh1j   hj  ubj!  )”}”(hhh]”h}”(h]”h ]”h"]”h$]”h&]”Œcolwidth”K@uh1j   hj  ubhŒtbody”“”)”}”(hhh]”(hŒrow”“”)”}”(hhh]”(hŒentry”“”)”}”(hhh]”hÉ)”}”(hŒsoft_margin”h]”hŒsoft_margin”…””}”(hjE  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhjB  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj=  ubjA  )”}”(hhh]”hÉ)”}”(hŒMallows the user to set the watchdog timer value.
Default value is 30 seconds.”h]”hŒMallows the user to set the watchdog timer value.
Default value is 30 seconds.”…””}”(hj\  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KhjY  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj=  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;  hj8  ubj<  )”}”(hhh]”(jA  )”}”(hhh]”hÉ)”}”(hŒtimeout”h]”hŒtimeout”…””}”(hj|  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khjy  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hjv  ubjA  )”}”(hhh]”hÉ)”}”(hŒan alias of soft_margin.”h]”hŒan alias of soft_margin.”…””}”(hj“  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h Khj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hjv  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;  hj8  ubj<  )”}”(hhh]”(jA  )”}”(hhh]”hÉ)”}”(hŒ
pretimeout”h]”hŒ
pretimeout”…””}”(hj³  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K hj°  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj­  ubjA  )”}”(hhh]”hÉ)”}”(hŒÝallows the user to set the watchdog pretimeout value.
This is the number of seconds before timeout when an
NMI is delivered to the system. Setting the value to
zero disables the pretimeout NMI.
Default value is 9 seconds.”h]”hŒÝallows the user to set the watchdog pretimeout value.
This is the number of seconds before timeout when an
NMI is delivered to the system. Setting the value to
zero disables the pretimeout NMI.
Default value is 9 seconds.”…””}”(hjÊ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K hjÇ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj­  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;  hj8  ubj<  )”}”(hhh]”(jA  )”}”(hhh]”hÉ)”}”(hŒnowayout”h]”hŒnowayout”…””}”(hjê  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K%hjç  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hjä  ubjA  )”}”(hhh]”hÉ)”}”(hŒ÷basic watchdog parameter that does not allow the timer to
be restarted or an impending ASR to be escaped.
Default value is set when compiling the kernel. If it is set
to "Y", then there is no way of disabling the watchdog once
it has been started.”h]”hŒûbasic watchdog parameter that does not allow the timer to
be restarted or an impending ASR to be escaped.
Default value is set when compiling the kernel. If it is set
to â€œYâ€, then there is no way of disabling the watchdog once
it has been started.”…””}”(hj  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K%hjþ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hjä  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;  hj8  ubj<  )”}”(hhh]”(jA  )”}”(hhh]”hÉ)”}”(hŒkdumptimeout”h]”hŒkdumptimeout”…””}”(hj!  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K*hj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj  ubjA  )”}”(hhh]”hÉ)”}”(hŒÎMinimum timeout in seconds to apply upon receipt of an NMI
before calling panic. (-1) disables the watchdog.  When value
is > 0, the timer is reprogrammed with the greater of
value or current timeout value.”h]”hŒÎMinimum timeout in seconds to apply upon receipt of an NMI
before calling panic. (-1) disables the watchdog.  When value
is > 0, the timer is reprogrammed with the greater of
value or current timeout value.”…””}”(hj8  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K*hj5  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j@  hj  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j;  hj8  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1j6  hj  ubeh}”(h]”h ]”h"]”h$]”h&]”Œcols”Kuh1j  hj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j  hhÚubhŒdefinition_list”“”)”}”(hhh]”hŒdefinition_list_item”“”)”}”(hŒÇNOTE:
More information about watchdog drivers in general, including the ioctl
interface to /dev/watchdog can be found in
Documentation/watchdog/watchdog-api.rst and Documentation/driver-api/ipmi.rst
”h]”(hŒterm”“”)”}”(hŒNOTE:”h]”hŒNOTE:”…””}”(hjr  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jp  hŸh¶h K3hjl  ubhŒ
definition”“”)”}”(hhh]”hÉ)”}”(hŒÀMore information about watchdog drivers in general, including the ioctl
interface to /dev/watchdog can be found in
Documentation/watchdog/watchdog-api.rst and Documentation/driver-api/ipmi.rst”h]”hŒÀMore information about watchdog drivers in general, including the ioctl
interface to /dev/watchdog can be found in
Documentation/watchdog/watchdog-api.rst and Documentation/driver-api/ipmi.rst”…””}”(hj…  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K1hj‚  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j€  hjl  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jj  hŸh¶h K3hjg  ubah}”(h]”h ]”h"]”h$]”h&]”uh1je  hhÚubhÉ)”}”(hX  Due to limitations in the iLO hardware, the NMI pretimeout if enabled,
can only be set to 9 seconds.  Attempts to set pretimeout to other
non-zero values will be rounded, possibly to zero.  Users should verify
the pretimeout value after attempting to set pretimeout or timeout.”h]”hX  Due to limitations in the iLO hardware, the NMI pretimeout if enabled,
can only be set to 9 seconds.  Attempts to set pretimeout to other
non-zero values will be rounded, possibly to zero.  Users should verify
the pretimeout value after attempting to set pretimeout or timeout.”…””}”(hj¥  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K5hhÚubhÉ)”}”(hŒÐUpon receipt of an NMI from the iLO, the hpwdt driver will initiate a
panic. This is to allow for a crash dump to be collected.  It is incumbent
upon the user to have properly configured the system for kdump.”h]”hŒÐUpon receipt of an NMI from the iLO, the hpwdt driver will initiate a
panic. This is to allow for a crash dump to be collected.  It is incumbent
upon the user to have properly configured the system for kdump.”…””}”(hj³  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K:hhÚubhÉ)”}”(hŒThe default Linux kernel behavior upon panic is to print a kernel tombstone
and loop forever.  This is generally not what a watchdog user wants.”h]”hŒThe default Linux kernel behavior upon panic is to print a kernel tombstone
and loop forever.  This is generally not what a watchdog user wants.”…””}”(hjÁ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h K>hhÚubjf  )”}”(hhh]”jk  )”}”(hŒÅFor those wishing to learn more please see:
- Documentation/admin-guide/kdump/kdump.rst
- Documentation/admin-guide/kernel-parameters.txt (panic=)
- Your Linux Distribution specific documentation.
”h]”(jq  )”}”(hŒ+For those wishing to learn more please see:”h]”hŒ+For those wishing to learn more please see:”…””}”(hjÖ  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1jp  hŸh¶h KDhjÒ  ubj  )”}”(hhh]”hŒbullet_list”“”)”}”(hhh]”(hŒ	list_item”“”)”}”(hŒ)Documentation/admin-guide/kdump/kdump.rst”h]”hÉ)”}”(hjð  h]”hŒ)Documentation/admin-guide/kdump/kdump.rst”…””}”(hjò  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KBhjî  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jì  hjé  ubjí  )”}”(hŒ8Documentation/admin-guide/kernel-parameters.txt (panic=)”h]”hÉ)”}”(hj  h]”hŒ8Documentation/admin-guide/kernel-parameters.txt (panic=)”…””}”(hj	  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KChj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jì  hjé  ubjí  )”}”(hŒ0Your Linux Distribution specific documentation.
”h]”hÉ)”}”(hŒ/Your Linux Distribution specific documentation.”h]”hŒ/Your Linux Distribution specific documentation.”…””}”(hj   hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KDhj  ubah}”(h]”h ]”h"]”h$]”h&]”uh1jì  hjé  ubeh}”(h]”h ]”h"]”h$]”h&]”Œbullet”Œ-”uh1jç  hŸh¶h KBhjä  ubah}”(h]”h ]”h"]”h$]”h&]”uh1j€  hjÒ  ubeh}”(h]”h ]”h"]”h$]”h&]”uh1jj  hŸh¶h KDhjÏ  ubah}”(h]”h ]”h"]”h$]”h&]”uh1je  hhÚubhÉ)”}”(hŒžIf the hpwdt does not receive the NMI associated with an expiring timer,
the iLO will proceed to reset the system at timeout if the timer hasn't
been updated.”h]”hŒ If the hpwdt does not receive the NMI associated with an expiring timer,
the iLO will proceed to reset the system at timeout if the timer hasnâ€™t
been updated.”…””}”(hjN  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KFhhÚubeh}”(h]”h ]”h"]”h$]”h&]”uh1hØhŸh¶h Khh·hžhubhÉ)”}”(hŒ--”h]”hŒ--”…””}”(hjb  hžhhŸNh Nubah}”(h]”h ]”h"]”h$]”h&]”uh1hÈhŸh¶h KJhh·hžhubhÙ)”}”(hŒ^The HPE iLO NMI Watchdog Driver and documentation were originally developed
by Tom Mingarelli.”h]”hÉ)”}”(hŒ^The HPE iLO NMI Watchdog Driver and documentation were originally developed
by Tom Mingarelli.”h]”hŒ^The HPE iLO NMI Watchdog Driver and documentation were originally developed
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