2 .\" Copyright (c) 1998 Kenneth D. Merry.
3 .\" All rights reserved.
5 .\" Redistribution and use in source and binary forms, with or without
6 .\" modification, are permitted provided that the following conditions
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13 .\" 3. The name of the author may not be used to endorse or promote products
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28 .\" $FreeBSD: src/share/man/man4/xpt.4,v 1.3.2.7 2001/08/17 13:08:40 ru Exp $
29 .\" $DragonFly: src/share/man/man4/xpt.4,v 1.2 2003/06/17 06:36:59 dillon Exp $
36 .Nd CAM transport layer interface
42 driver provides a way for userland applications to issue certain CAM CCBs
47 driver allows direct access to the CAM subsystem, system administrators
48 should exercise caution when granting access to this driver. If used
49 improperly, this driver can allow userland applications to crash a machine
51 .Sh KERNEL CONFIGURATION
52 There is no kernel configuration required for the
54 driver. It is enabled when
56 support is enabled in the kernel. There is one instance of the xpt driver
57 per CAM transport layer instance. Since there is currently only one CAM
58 transport layer, there will only be one instance of this driver.
60 .Bl -tag -width 01234567890123
62 This ioctl takes certain kinds of CAM CCBs and passes them through to the
63 CAM transport layer for action. Only the following CCB types are
66 .Bl -tag -width XPT_DEV_MATCH -compact
77 The above CCBs are the only ones supported since it makes more sense to
78 send them through a generic passthrough device rather than a passthrough
79 device tied to a particular underlying
83 This ioctl takes an XPT_GDEVLIST CCB, and returns the passthrough device
84 corresponding to the device in question.
87 .Bl -tag -width /dev/xpt0 -compact
89 Character device node for the
101 The CAM transport layer driver first appeared in
104 .An Kenneth Merry Aq ken@FreeBSD.org