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11 drive s390 based channel attached I/O devices. This includes interfaces
14 I/O layer.
17 with the s390 channel I/O architecture. For a description of this
21 While most I/O devices on a s390 system are typically driven through the
22 channel I/O mechanism described here, there are various other methods
25 The s390 common I/O layer also provides access to some devices that are
26 not strictly considered I/O devices. They are considered here as well,
38 * Standard I/O subchannels, for use by the system. They have a child
40 * I/O subchannels bound to the vfio-ccw driver. See
53 so-called channel attached devices. They are addressed via I/O
56 subchannel directly, but only via the I/O device on the ccw bus, the ccw
59 I/O functions for channel-attached devices
63 by the common I/O layer and device drivers. For more information on the
73 Devices that want to initiate channel I/O need to attach to the ccw bus.
74 Interaction with the driver core is done via the common I/O layer, which
77 The functions that initiate or terminate channel I/O all act upon a ccw
131 The common I/O layer provides helper functions for dealing with adapter