1What: /sys/devices/system/edac/mc/mc*/reset_counters 2Date: January 2006 3Contact: linux-edac@vger.kernel.org 4Description: 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 12What: /sys/devices/system/edac/mc/mc*/seconds_since_reset 13Date: January 2006 14Contact: linux-edac@vger.kernel.org 15Description: 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 19What: /sys/devices/system/edac/mc/mc*/mc_name 20Date: January 2006 21Contact: linux-edac@vger.kernel.org 22Description: This attribute file displays the type of memory controller 23 that is being utilized. 24 25What: /sys/devices/system/edac/mc/mc*/size_mb 26Date: January 2006 27Contact: linux-edac@vger.kernel.org 28Description: This attribute file displays, in count of megabytes, of memory 29 that this memory controller manages. 30 31What: /sys/devices/system/edac/mc/mc*/ue_count 32Date: January 2006 33Contact: linux-edac@vger.kernel.org 34Description: 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 39What: /sys/devices/system/edac/mc/mc*/ue_noinfo_count 40Date: January 2006 41Contact: linux-edac@vger.kernel.org 42Description: 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 46What: /sys/devices/system/edac/mc/mc*/ce_count 47Date: January 2006 48Contact: linux-edac@vger.kernel.org 49Description: 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 56What: /sys/devices/system/edac/mc/mc*/ce_noinfo_count 57Date: January 2006 58Contact: linux-edac@vger.kernel.org 59Description: 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 66What: /sys/devices/system/edac/mc/mc*/sdram_scrub_rate 67Date: February 2007 68Contact: linux-edac@vger.kernel.org 69Description: 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 78What: /sys/devices/system/edac/mc/mc*/max_location 79Date: April 2012 80Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 81 linux-edac@vger.kernel.org 82Description: 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 86What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/size 87Date: April 2012 88Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 89 linux-edac@vger.kernel.org 90Description: 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 97What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_dev_type 98Date: April 2012 99Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 100 linux-edac@vger.kernel.org 101Description: This attribute file will display what type of DRAM device is 102 being utilized on this DIMM (x1, x2, x4, x8, ...). 103 104What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_edac_mode 105Date: April 2012 106Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 107 linux-edac@vger.kernel.org 108Description: 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 112What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_label 113Date: April 2012 114Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 115 linux-edac@vger.kernel.org 116Description: 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 127What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_location 128Date: April 2012 129Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 130 linux-edac@vger.kernel.org 131Description: This attribute file will display the location (csrow/channel, 132 branch/channel/slot or channel/slot) of the dimm or rank. 133 134What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_mem_type 135Date: April 2012 136Contact: Mauro Carvalho Chehab <mchehab+samsung@kernel.org> 137 linux-edac@vger.kernel.org 138Description: 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). 141 142What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_ce_count 143Date: October 2016 144Contact: linux-edac@vger.kernel.org 145Description: This attribute file displays the total count of correctable 146 errors that have occurred on this DIMM. This count is very important 147 to examine. CEs provide early indications that a DIMM is beginning 148 to fail. This count field should be monitored for non-zero values 149 and report such information to the system administrator. 150 151What: /sys/devices/system/edac/mc/mc*/(dimm|rank)*/dimm_ue_count 152Date: October 2016 153Contact: linux-edac@vger.kernel.org 154Description: This attribute file displays the total count of uncorrectable 155 errors that have occurred on this DIMM. If panic_on_ue is set, this 156 counter will not have a chance to increment, since EDAC will panic the 157 system 158