---
name: "struct_ccw_dev_id"
section: "9"
platform: "linux"
package: "linux-manual-4.9"
version: "4.9.228-1"
release: "Debian 9 (Stretch)"
platforms: ["linux"]
url: "https://new.carta.tech/struct_ccw_dev_id"
---

# struct\_ccw\_dev\_id(9)

unique identifier for ccw devices

## NAME

struct\_ccw\_dev\_id - unique identifier for ccw devices

## SYNOPSIS

```
struct ccw_dev_id {
  u8 ssid;
  u16 devno;
};
```

## MEMBERS

ssid

subchannel set id

devno

device number

## DESCRIPTION

This structure is not directly based on any hardware structure. The hardware identifies a device by its device number and its subchannel, which is in turn identified by its id. In order to get a unique identifier for ccw devices across subchannel sets, *struct* ccw\_dev\_id has been introduced.

## AUTHOR

**Cornelia Huck** \<cornelia.huck@de.ibm.com\>

Author.

## COPYRIGHT