Documentation/ABI/testing/sysfs-devices-edac

   1 What:           /sys/devices/system/edac/mc/mc*/reset_counters
   2 Date:           January 2006
   3 Contact:        linux-edac@vger.kernel.org
   4 Description:    This write-only control file will zero all the statistical
   5                 counters for UE and CE errors on the given memory controller.
   6                 Zeroing the counters will also reset the timer indicating how
   7                 long since the last counter were reset. This is useful for
   8                 computing errors/time.  Since the counters are always reset
   9                 at driver initialization time, no module/kernel parameter
  10                 is available.
  11
  12 What:           /sys/devices/system/edac/mc/mc*/seconds_since_reset
  13 Date:           January 2006
  14 Contact:        linux-edac@vger.kernel.org
  15 Description:    This attribute file displays how many seconds have elapsed
  16                 since the last counter reset. This can be used with the error
  17                 counters to measure error rates.
  18
  19 What:           /sys/devices/system/edac/mc/mc*/mc_name
  20 Date:           January 2006
  21 Contact:        linux-edac@vger.kernel.org
  22 Description:    This attribute file displays the type of memory controller
  23                 that is being utilized.
  24
  25 What:           /sys/devices/system/edac/mc/mc*/size_mb
  26 Date:           January 2006
  27 Contact:        linux-edac@vger.kernel.org
  28 Description:    This attribute file displays, in count of megabytes, of memory
  29                 that this memory controller manages.
  30
  31 What:           /sys/devices/system/edac/mc/mc*/ue_count
  32 Date:           January 2006
  33 Contact:        linux-edac@vger.kernel.org
  34 Description:    This attribute file displays the total count of uncorrectable
  35                 errors that have occurred on this memory controller. If
  36                 panic_on_ue is set, this counter will not have a chance to
  37                 increment, since EDAC will panic the system
  38
  39 What:           /sys/devices/system/edac/mc/mc*/ue_noinfo_count
  40 Date:           January 2006
  41 Contact:        linux-edac@vger.kernel.org
  42 Description:    This attribute file displays the number of UEs that have
  43                 occurred on this memory controller with no information as to
  44                 which DIMM slot is having errors.
  45
  46 What:           /sys/devices/system/edac/mc/mc*/ce_count
  47 Date:           January 2006
  48 Contact:        linux-edac@vger.kernel.org
  49 Description:    This attribute file displays the total count of correctable
  50                 errors that have occurred on this memory controller. This
  51                 count is very important to examine. CEs provide early
  52                 indications that a DIMM is beginning to fail. This count
  53                 field should be monitored for non-zero values and report
  54                 such information to the system administrator.
  55
  56 What:           /sys/devices/system/edac/mc/mc*/ce_noinfo_count
  57 Date:           January 2006
  58 Contact:        linux-edac@vger.kernel.org
  59 Description:    This attribute file displays the number of CEs that
  60                 have occurred on this memory controller wherewith no
  61                 information as to which DIMM slot is having errors. Memory is
  62                 handicapped, but operational, yet no information is available
  63                 to indicate which slot the failing memory is in. This count
  64                 field should be also be monitored for non-zero values.
  65
  66 What:           /sys/devices/system/edac/mc/mc*/sdram_scrub_rate
  67 Date:           February 2007
  68 Contact:        linux-edac@vger.kernel.org
  69 Description:    Read/Write attribute file that controls memory scrubbing.
  70                 The scrubbing rate used by the memory controller is set by
  71                 writing a minimum bandwidth in bytes/sec to the attribute file.
  72                 The rate will be translated to an internal value that gives at
  73                 least the specified rate.
  74                 Reading the file will return the actual scrubbing rate employed.
  75                 If configuration fails or memory scrubbing is not implemented,
  76                 the value of the attribute file will be -1.
  77
  78 What:           /sys/devices/system/edac/mc/mc*/max_location
  79 Date:           April 2012
  80 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
  81                 linux-edac@vger.kernel.org
  82 Description:    This attribute file displays the information about the last
  83                 available memory slot in this memory controller. It is used by
  84                 userspace tools in order to display the memory filling layout.
  85
  86 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/size
  87 Date:           April 2012
  88 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
  89                 linux-edac@vger.kernel.org
  90 Description:    This attribute file will display the size of dimm or rank.
  91                 For dimm*/size, this is the size, in MB of the DIMM memory
  92                 stick. For rank*/size, this is the size, in MB for one rank
  93                 of the DIMM memory stick. On single rank memories (1R), this
  94                 is also the total size of the dimm. On dual rank (2R) memories,
  95                 this is half the size of the total DIMM memories.
  96
  97 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_dev_type
  98 Date:           April 2012
  99 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
 100                 linux-edac@vger.kernel.org
 101 Description:    This attribute file will display what type of DRAM device is
 102                 being utilized on this DIMM (x1, x2, x4, x8, ...).
 103
 104 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_edac_mode
 105 Date:           April 2012
 106 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
 107                 linux-edac@vger.kernel.org
 108 Description:    This attribute file will display what type of Error detection
 109                 and correction is being utilized. For example: S4ECD4ED would
 110                 mean a Chipkill with x4 DRAM.
 111
 112 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_label
 113 Date:           April 2012
 114 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
 115                 linux-edac@vger.kernel.org
 116 Description:    This control file allows this DIMM to have a label assigned
 117                 to it. With this label in the module, when errors occur
 118                 the output can provide the DIMM label in the system log.
 119                 This becomes vital for panic events to isolate the
 120                 cause of the UE event.
 121                 DIMM Labels must be assigned after booting, with information
 122                 that correctly identifies the physical slot with its
 123                 silk screen label. This information is currently very
 124                 motherboard specific and determination of this information
 125                 must occur in userland at this time.
 126
 127 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_location
 128 Date:           April 2012
 129 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
 130                 linux-edac@vger.kernel.org
 131 Description:    This attribute file will display the location (csrow/channel,
 132                 branch/channel/slot or channel/slot) of the dimm or rank.
 133
 134 What:           /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_mem_type
 135 Date:           April 2012
 136 Contact:        Mauro Carvalho Chehab <m.chehab@samsung.com>
 137                 linux-edac@vger.kernel.org
 138 Description:    This attribute file will display what type of memory is
 139                 currently on this csrow. Normally, either buffered or
 140                 unbuffered memory (for example, Unbuffered-DDR3).