NAME¶

cxl-clear-media-poison - Clear poison from CXL memory

SYNOPSIS¶

cxl clear-media-poison <memdev> [<options>]

Clear poison from a CXL memory device’s memory. CXL memdevs can be specified by device name (e.g. "mem0"), device id ("X" in "memX"), or host device name ("0000:35:00.0").

To see if a device has poison that can be cleared use the cxl-list command with the -L/--media-errors option. An example of a device that has had poison injected at device physical address (a.k.a. "offset") 0x1000:

# cxl list -m mem0 -L -u
{


  "memdev":"mem0",


  "ram_size":"1024.00 MiB (1073.74 MB)",


  "ram_qos_class":42,


  "serial":"0x0",


  "numa_node:1,


  "host":"0000:35:00.0",


  "media_errors":[


    {


          "offset":"0x1000",


          "length":64,


          "source":"Injected"


        }


  ]
}

A device physical address is required to clear poison from a CXL memdev. The -a/--address option is used to specify the address to clear poison at. The address can be given in either decimal or hexadecimal. An example using the example device above:

# cxl clear-media-poison mem0 -a 0x1000
poison cleared at mem0:0x1000
# cxl list -m mem0 -L -u
{


  "memdev":"mem0",


  "ram_size":"1024.00 MiB (1073.74 MB)",


  "ram_qos_class":42,


  "serial":"0x0",


  "numa_node:1,


  "host":"0000:35:00.0",


  "media_errors":[


  ]
}

See the inject-media-poison command for how to inject poison into a CXL memory device.

This command depends on the CXL debug filesystem (normally mounted at "/sys/kernel/debug/cxl") to clear device poison.

OPTIONS¶

-a, --address

--debug

SEE ALSO¶

cxl-list(1) cxl-clear-media-poison(1)