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Commit a2ee2981 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip 

* 'x86-mce-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip: (80 commits)
  x86, mce: Add boot options for corrected errors
  x86, mce: Fix mce printing
  x86, mce: fix for mce counters
  x86, mce: support action-optional machine checks
  x86, mce: define MCE_VECTOR
  x86, mce: rename mce_notify_user to mce_notify_irq
  x86: fix panic with interrupts off (needed for MCE)
  x86, mce: export MCE severities coverage via debugfs
  x86, mce: implement new status bits
  x86, mce: print header/footer only once for multiple MCEs
  x86, mce: default to panic timeout for machine checks
  x86, mce: improve mce_get_rip
  x86, mce: make non Monarch panic message "Fatal machine check" too
  x86, mce: switch x86 machine check handler to Monarch election.
  x86, mce: implement panic synchronization
  x86, mce: implement bootstrapping for machine check wakeups
  x86, mce: check early in exception handler if panic is needed
  x86, mce: add table driven machine check grading
  x86, mce: remove TSC print heuristic
  x86, mce: log corrected errors when panicing
  ...
parents 7603ef03 0d595972

Documentation/Changes

+15 −0
Original line number Diff line number Diff line
@@ -48,6 +48,7 @@ o procps 3.2.0 # ps --version 
o  oprofile               0.9                     # oprofiled --version

o  udev                   081                     # udevinfo -V

o  grub                   0.93                    # grub --version

o  mcelog		  0.6



Kernel compilation

==================
@@ -276,6 +277,16 @@ before running exportfs or mountd. It is recommended that all NFS 
services be protected from the internet-at-large by a firewall where

that is possible.



mcelog

------



In Linux 2.6.31+ the i386 kernel needs to run the mcelog utility

as a regular cronjob similar to the x86-64 kernel to process and log

machine check events when CONFIG_X86_NEW_MCE is enabled. Machine check

events are errors reported by the CPU. Processing them is strongly encouraged.

All x86-64 kernels since 2.6.4 require the mcelog utility to

process machine checks.



Getting updated software

========================
@@ -365,6 +376,10 @@ FUSE 
----

o <http://sourceforge.net/projects/fuse>



mcelog

------

o <ftp://ftp.kernel.org/pub/linux/utils/cpu/mce/mcelog/>



Networking

**********

Documentation/feature-removal-schedule.txt

+10 −0
Original line number Diff line number Diff line
@@ -437,3 +437,13 @@ Why: Superseded by tdfxfb. I2C/DDC support used to live in a separate 
	driver but this caused driver conflicts.

Who:	Jean Delvare <khali@linux-fr.org>

	Krzysztof Helt <krzysztof.h1@wp.pl>



----------------------------



What:	CONFIG_X86_OLD_MCE

When:	2.6.32

Why:	Remove the old legacy 32bit machine check code. This has been

	superseded by the newer machine check code from the 64bit port,

	but the old version has been kept around for easier testing. Note this

	doesn't impact the old P5 and WinChip machine check handlers.

Who:	Andi Kleen <andi@firstfloor.org>

Documentation/x86/x86_64/boot-options.txt

+37 −7
Original line number Diff line number Diff line
@@ -5,21 +5,51 @@ only the AMD64 specific ones are listed here. 


Machine check



   mce=off disable machine check

   mce=bootlog Enable logging of machine checks left over from booting.

   Please see Documentation/x86/x86_64/machinecheck for sysfs runtime tunables.



   mce=off

		Disable machine check

   mce=no_cmci

		Disable CMCI(Corrected Machine Check Interrupt) that

		Intel processor supports.  Usually this disablement is

		not recommended, but it might be handy if your hardware

		is misbehaving.

		Note that you'll get more problems without CMCI than with

		due to the shared banks, i.e. you might get duplicated

		error logs.

   mce=dont_log_ce

		Don't make logs for corrected errors.  All events reported

		as corrected are silently cleared by OS.

		This option will be useful if you have no interest in any

		of corrected errors.

   mce=ignore_ce

		Disable features for corrected errors, e.g. polling timer

		and CMCI.  All events reported as corrected are not cleared

		by OS and remained in its error banks.

		Usually this disablement is not recommended, however if

		there is an agent checking/clearing corrected errors

		(e.g. BIOS or hardware monitoring applications), conflicting

		with OS's error handling, and you cannot deactivate the agent,

		then this option will be a help.

   mce=bootlog

		Enable logging of machine checks left over from booting.

		Disabled by default on AMD because some BIOS leave bogus ones.

		If your BIOS doesn't do that it's a good idea to enable though

		to make sure you log even machine check events that result

		in a reboot. On Intel systems it is enabled by default.

   mce=nobootlog

		Disable boot machine check logging.

   mce=tolerancelevel (number)

   mce=tolerancelevel[,monarchtimeout] (number,number)

		tolerance levels:

		0: always panic on uncorrected errors, log corrected errors

		1: panic or SIGBUS on uncorrected errors, log corrected errors

		2: SIGBUS or log uncorrected errors, log corrected errors

		3: never panic or SIGBUS, log all errors (for testing only)

		Default is 1

		Can be also set using sysfs which is preferable.

		monarchtimeout:

		Sets the time in us to wait for other CPUs on machine checks. 0

		to disable.



   nomce (for compatibility with i386): same as mce=off

Documentation/x86/x86_64/machinecheck

+7 −1
Original line number Diff line number Diff line
@@ -41,7 +41,9 @@ check_interval 
	the polling interval.  When the poller stops finding MCEs, it

	triggers an exponential backoff (poll less often) on the polling

	interval. The check_interval variable is both the initial and

	maximum polling interval.

	maximum polling interval. 0 means no polling for corrected machine

	check errors (but some corrected errors might be still reported

	in other ways)



tolerant

	Tolerance level. When a machine check exception occurs for a non
@@ -67,6 +69,10 @@ trigger 
	Program to run when a machine check event is detected.

	This is an alternative to running mcelog regularly from cron

	and allows to detect events faster.

monarch_timeout

	How long to wait for the other CPUs to machine check too on a

	exception. 0 to disable waiting for other CPUs.

	Unit: us



TBD document entries for AMD threshold interrupt configuration

arch/x86/Kconfig

+41 −4
Original line number Diff line number Diff line
@@ -789,10 +789,26 @@ config X86_MCE 
	  to disable it.  MCE support simply ignores non-MCE processors like

	  the 386 and 486, so nearly everyone can say Y here.



config X86_OLD_MCE

	depends on X86_32 && X86_MCE

	bool "Use legacy machine check code (will go away)"

	default n

	select X86_ANCIENT_MCE

	---help---

	  Use the old i386 machine check code. This is merely intended for

	  testing in a transition period. Try this if you run into any machine

	  check related software problems, but report the problem to

	  linux-kernel.  When in doubt say no.



config X86_NEW_MCE

	depends on X86_MCE

	bool

	default y if (!X86_OLD_MCE && X86_32) || X86_64



config X86_MCE_INTEL

	def_bool y

	prompt "Intel MCE features"

	depends on X86_64 && X86_MCE && X86_LOCAL_APIC

	depends on X86_NEW_MCE && X86_LOCAL_APIC

	---help---

	   Additional support for intel specific MCE features such as

	   the thermal monitor.
@@ -800,19 +816,36 @@ config X86_MCE_INTEL 
config X86_MCE_AMD

	def_bool y

	prompt "AMD MCE features"

	depends on X86_64 && X86_MCE && X86_LOCAL_APIC

	depends on X86_NEW_MCE && X86_LOCAL_APIC

	---help---

	   Additional support for AMD specific MCE features such as

	   the DRAM Error Threshold.



config X86_ANCIENT_MCE

	def_bool n

	depends on X86_32

	prompt "Support for old Pentium 5 / WinChip machine checks"

	---help---

	  Include support for machine check handling on old Pentium 5 or WinChip

	  systems. These typically need to be enabled explicitely on the command

	  line.



config X86_MCE_THRESHOLD

	depends on X86_MCE_AMD || X86_MCE_INTEL

	bool

	default y



config X86_MCE_INJECT

	depends on X86_NEW_MCE

	tristate "Machine check injector support"

	---help---

	  Provide support for injecting machine checks for testing purposes.

	  If you don't know what a machine check is and you don't do kernel

	  QA it is safe to say n.



config X86_MCE_NONFATAL

	tristate "Check for non-fatal errors on AMD Athlon/Duron / Intel Pentium 4"

	depends on X86_32 && X86_MCE

	depends on X86_OLD_MCE

	---help---

	  Enabling this feature starts a timer that triggers every 5 seconds which

	  will look at the machine check registers to see if anything happened.
@@ -825,11 +858,15 @@ config X86_MCE_NONFATAL 


config X86_MCE_P4THERMAL

	bool "check for P4 thermal throttling interrupt."

	depends on X86_32 && X86_MCE && (X86_UP_APIC || SMP)

	depends on X86_OLD_MCE && X86_MCE && (X86_UP_APIC || SMP)

	---help---

	  Enabling this feature will cause a message to be printed when the P4

	  enters thermal throttling.



config X86_THERMAL_VECTOR

	def_bool y

	depends on X86_MCE_P4THERMAL || X86_MCE_INTEL



config VM86

	bool "Enable VM86 support" if EMBEDDED

	default y