edac: move documentation ABI to ABI/testing/sysfs-devices-edac
The EDAC MC API is currently stored at the wrong place. Move the parts of the EDAC MC ABI that will be kept to ABI/testing/sysfs-devices-edac. The Date: field were added based on git timestamps for the git commit patches that added the functionality at edac.txt. Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>hifive-unleashed-5.1
Mauro Carvalho Chehab
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356f0a3086
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What: /sys/devices/system/edac/mc/mc*/reset_counters
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This write-only control file will zero all the statistical
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counters for UE and CE errors on the given memory controller.
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Zeroing the counters will also reset the timer indicating how
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long since the last counter were reset. This is useful for
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computing errors/time. Since the counters are always reset
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at driver initialization time, no module/kernel parameter
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is available.
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What: /sys/devices/system/edac/mc/mc*/seconds_since_reset
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays how many seconds have elapsed
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since the last counter reset. This can be used with the error
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counters to measure error rates.
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What: /sys/devices/system/edac/mc/mc*/mc_name
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays the type of memory controller
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that is being utilized.
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What: /sys/devices/system/edac/mc/mc*/size_mb
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays, in count of megabytes, of memory
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that this memory controller manages.
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What: /sys/devices/system/edac/mc/mc*/ue_count
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays the total count of uncorrectable
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errors that have occurred on this memory controller. If
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panic_on_ue is set, this counter will not have a chance to
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increment, since EDAC will panic the system
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What: /sys/devices/system/edac/mc/mc*/ue_noinfo_count
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays the number of UEs that have
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occurred on this memory controller with no information as to
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which DIMM slot is having errors.
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What: /sys/devices/system/edac/mc/mc*/ce_count
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays the total count of correctable
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errors that have occurred on this memory controller. This
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count is very important to examine. CEs provide early
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indications that a DIMM is beginning to fail. This count
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field should be monitored for non-zero values and report
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such information to the system administrator.
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What: /sys/devices/system/edac/mc/mc*/ce_noinfo_count
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Date: January 2006
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Contact: linux-edac@vger.kernel.org
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Description: This attribute file displays the number of CEs that
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have occurred on this memory controller wherewith no
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information as to which DIMM slot is having errors. Memory is
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handicapped, but operational, yet no information is available
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to indicate which slot the failing memory is in. This count
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field should be also be monitored for non-zero values.
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What: /sys/devices/system/edac/mc/mc*/sdram_scrub_rate
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Date: February 2007
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Contact: linux-edac@vger.kernel.org
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Description: Read/Write attribute file that controls memory scrubbing.
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The scrubbing rate used by the memory controller is set by
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writing a minimum bandwidth in bytes/sec to the attribute file.
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The rate will be translated to an internal value that gives at
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least the specified rate.
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Reading the file will return the actual scrubbing rate employed.
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If configuration fails or memory scrubbing is not implemented,
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the value of the attribute file will be -1.
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@ -232,116 +232,20 @@ EDAC control and attribute files.
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In 'mcX' directories are EDAC control and attribute files for
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this 'X' instance of the memory controllers:
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Counter reset control file:
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'reset_counters'
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This write-only control file will zero all the statistical counters
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for UE and CE errors. Zeroing the counters will also reset the timer
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indicating how long since the last counter zero. This is useful
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for computing errors/time. Since the counters are always reset at
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driver initialization time, no module/kernel parameter is available.
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RUN TIME: echo "anything" >/sys/devices/system/edac/mc/mc0/counter_reset
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This resets the counters on memory controller 0
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Seconds since last counter reset control file:
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'seconds_since_reset'
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This attribute file displays how many seconds have elapsed since the
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last counter reset. This can be used with the error counters to
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measure error rates.
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Memory Controller name attribute file:
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'mc_name'
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This attribute file displays the type of memory controller
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that is being utilized.
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Total memory managed by this memory controller attribute file:
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'size_mb'
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This attribute file displays, in count of megabytes, of memory
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that this instance of memory controller manages.
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Total Uncorrectable Errors count attribute file:
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'ue_count'
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This attribute file displays the total count of uncorrectable
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errors that have occurred on this memory controller. If panic_on_ue
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is set this counter will not have a chance to increment,
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since EDAC will panic the system.
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Total UE count that had no information attribute fileY:
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'ue_noinfo_count'
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This attribute file displays the number of UEs that have occurred
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with no information as to which DIMM slot is having errors.
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Total Correctable Errors count attribute file:
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'ce_count'
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This attribute file displays the total count of correctable
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errors that have occurred on this memory controller. This
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count is very important to examine. CEs provide early
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indications that a DIMM is beginning to fail. This count
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field should be monitored for non-zero values and report
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such information to the system administrator.
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Total Correctable Errors count attribute file:
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'ce_noinfo_count'
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This attribute file displays the number of CEs that
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have occurred wherewith no information as to which DIMM slot
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is having errors. Memory is handicapped, but operational,
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yet no information is available to indicate which slot
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the failing memory is in. This count field should be also
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be monitored for non-zero values.
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Device Symlink:
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'device'
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Symlink to the memory controller device.
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Sdram memory scrubbing rate:
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'sdram_scrub_rate'
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Read/Write attribute file that controls memory scrubbing. The scrubbing
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rate is set by writing a minimum bandwidth in bytes/sec to the attribute
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file. The rate will be translated to an internal value that gives at
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least the specified rate.
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Reading the file will return the actual scrubbing rate employed.
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If configuration fails or memory scrubbing is not implemented, accessing
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that attribute will fail.
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this 'X' instance of the memory controllers.
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For a description of the sysfs API, please see:
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Documentation/ABI/testing/sysfs/devices-edac
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============================================================================
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'csrowX' DIRECTORIES
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When CONFIG_EDAC_LEGACY_SYSFS is enabled, the sysfs will contain the
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csrowX directories. As this API doesn't work properly for Rambus, FB-DIMMs
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and modern Intel Memory Controllers, this is being deprecated in favor
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of dimmX directories.
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In the 'csrowX' directories are EDAC control and attribute files for
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this 'X' instance of csrow:
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