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|
.\" -*- nroff -*-
.TH TAPSET::SCSI 3stap "" "IBM"
.SH NAME
tapset::scsi \- systemtap scsi probe points
.\" macros
.de SAMPLE
.br
.RS
.nf
.nh
..
.de ESAMPLE
.hy
.fi
.RE
..
.SH DESCRIPTION
This family of probe points is used to probe the SCSI activities.
It contains the following probe points:
.P
.TP
.B scsi.ioentry
Fires when SCSI mid layer prepares a SCSI request
.B Arguments:
.I disk_major
The major number of the disk
.I disk_minor
The minor number of the disk
.I device_state
The current state of the device. The possible values could be:
SDEV_CREATED = 1, /* device created but not added to sysfs
* Only internal commands allowed (for inq) */
SDEV_RUNNING = 2, /* device properly configured
* All commands allowed */
SDEV_CANCEL = 3, /* beginning to delete device
* Only error handler commands allowed */
SDEV_DEL = 4, /* device deleted
* no commands allowed */
SDEV_QUIESCE = 5, /* Device quiescent. No block commands
* will be accepted, only specials (which
* originate in the mid-layer) */
SDEV_OFFLINE = 6, /* Device offlined (by error handling or
* user request */
SDEV_BLOCK = 7, /* Device blocked by scsi lld. No scsi
* commands from user or midlayer should be issued
* to the scsi lld. */
.P
.TP
.B scsi.iodispatching
Fires when the SCSI mid layer dispatches a SCSI command to the low level driver
.B Arguments:
.I host_no
The host number
.I channel
The channel number
.I lun
The lun number
.I dev_id
The scsi device id
.I device_state
The current state of the device.
.I data_direction
The data_direction specifies whether this command is from/to the device.
The possible values could be:
DMA_BIDIRECTIONAL = 0,
DMA_TO_DEVICE = 1,
DMA_FROM_DEVICE = 2,
DMA_NONE = 3,
.I request_buffer
The request buffer address
.I req_bufflen
The request buffer length
.P
.TP
.B scsi.iodone
Fires when a SCSI command is done by low level driver and enqueued into the done queue.
.B Arguments:
.I host_no
The host number
.I channel
The channel number
.I lun
The lun number
.I dev_id
The scsi device id
.I device_state
The current state of the device
.I data_direction
The data_direction specifies whether this command is from/to the device.
.P
.TP
.B scsi.iocompleted
Fires when SCSI mid layer runs the completion processing for
block device I/O requests
.B Arguments:
.I host_no
The host number
.I channel
The channel number
.I lun
The lun number
.I dev_id
The scsi device id
.I device_state
The current state of the device
.I data_direction
The data_direction specifies whether this command is from/to the device.
.I goodbytes
The bytes completed.
.SH SEE ALSO
.IR stap (1),
.IR stapprobes (3stap)
|
