| What: /sys/bus/edac/devices/<dev-name>/ecs_fruX |
| Date: March 2025 |
| KernelVersion: 6.15 |
| Contact: linux-edac@vger.kernel.org |
| Description: |
| The sysfs EDAC bus devices /<dev-name>/ecs_fruX subdirectory |
| pertains to the memory media ECS (Error Check Scrub) control |
| feature, where <dev-name> directory corresponds to a device |
| registered with the EDAC device driver for the ECS feature. |
| /ecs_fruX belongs to the media FRUs (Field Replaceable Unit) |
| under the memory device. |
| |
| The sysfs ECS attr nodes are only present if the parent |
| driver has implemented the corresponding attr callback |
| function and provided the necessary operations to the EDAC |
| device driver during registration. |
| |
| What: /sys/bus/edac/devices/<dev-name>/ecs_fruX/log_entry_type |
| Date: March 2025 |
| KernelVersion: 6.15 |
| Contact: linux-edac@vger.kernel.org |
| Description: |
| (RW) The log entry type of how the DDR5 ECS log is reported. |
| |
| - 0 - per DRAM. |
| |
| - 1 - per memory media FRU. |
| |
| - All other values are reserved. |
| |
| What: /sys/bus/edac/devices/<dev-name>/ecs_fruX/mode |
| Date: March 2025 |
| KernelVersion: 6.15 |
| Contact: linux-edac@vger.kernel.org |
| Description: |
| (RW) The mode of how the DDR5 ECS counts the errors. |
| Error count is tracked based on two different modes |
| selected by DDR5 ECS Control Feature - Codeword mode and |
| Row Count mode. If the ECS is under Codeword mode, then |
| the error count increments each time a codeword with check |
| bit errors is detected. If the ECS is under Row Count mode, |
| then the error counter increments each time a row with |
| check bit errors is detected. |
| |
| - 0 - ECS counts rows in the memory media that have ECC errors. |
| |
| - 1 - ECS counts codewords with errors, specifically, it counts |
| the number of ECC-detected errors in the memory media. |
| |
| - All other values are reserved. |
| |
| What: /sys/bus/edac/devices/<dev-name>/ecs_fruX/reset |
| Date: March 2025 |
| KernelVersion: 6.15 |
| Contact: linux-edac@vger.kernel.org |
| Description: |
| (WO) ECS reset ECC counter. |
| |
| - 1 - reset ECC counter to the default value. |
| |
| - All other values are reserved. |
| |
| What: /sys/bus/edac/devices/<dev-name>/ecs_fruX/threshold |
| Date: March 2025 |
| KernelVersion: 6.15 |
| Contact: linux-edac@vger.kernel.org |
| Description: |
| (RW) DDR5 ECS threshold count per gigabits of memory cells. |
| The ECS error count is subject to the ECS Threshold count |
| per Gbit, which masks error counts less than the Threshold. |
| |
| Supported values are 256, 1024 and 4096. |
| |
| All other values are reserved. |
