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The EDAC ABI were extended to add support for per-DIMM or per-rank information and silkscreen labels. Properly document them. Most of the comments there came from edac.txt descriptions of the fields that are part of the legacy csrowX ABI (e. g. /sys/devices/system/edac/mc/mc*/csrow*/*). Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
141 lines
6.1 KiB
Plaintext
141 lines
6.1 KiB
Plaintext
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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What: /sys/devices/system/edac/mc/mc*/max_location
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file displays the information about the last
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available memory slot in this memory controller. It is used by
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userspace tools in order to display the memory filling layout.
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/size
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file will display the size of dimm or rank.
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For dimm*/size, this is the size, in MB of the DIMM memory
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stick. For rank*/size, this is the size, in MB for one rank
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of the DIMM memory stick. On single rank memories (1R), this
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is also the total size of the dimm. On dual rank (2R) memories,
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this is half the size of the total DIMM memories.
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_dev_type
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file will display what type of DRAM device is
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being utilized on this DIMM (x1, x2, x4, x8, ...).
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_edac_mode
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file will display what type of Error detection
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and correction is being utilized. For example: S4ECD4ED would
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mean a Chipkill with x4 DRAM.
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_label
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This control file allows this DIMM to have a label assigned
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to it. With this label in the module, when errors occur
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the output can provide the DIMM label in the system log.
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This becomes vital for panic events to isolate the
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cause of the UE event.
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DIMM Labels must be assigned after booting, with information
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that correctly identifies the physical slot with its
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silk screen label. This information is currently very
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motherboard specific and determination of this information
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must occur in userland at this time.
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_location
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file will display the location (csrow/channel,
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branch/channel/slot or channel/slot) of the dimm or rank.
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What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_mem_type
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Date: April 2012
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Contact: Mauro Carvalho Chehab <mchehab@redhat.com>
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linux-edac@vger.kernel.org
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Description: This attribute file will display what type of memory is
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currently on this csrow. Normally, either buffered or
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unbuffered memory (for example, Unbuffered-DDR3).
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