stapprobes.scsi(5)

NAME

stapprobes.scsi - systemtap scsi probe points

DESCRIPTION

This family of probe points is used to probe the SCSI activities. It contains the following probe points:

scsi.ioentry

Fires when SCSI mid layer prepares a SCSI request

Arguments:

disk_major

The major number of the disk

disk_minor

The minor number of the disk

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 com

mands

* will be accepted, only specials

(which

* originate in the mid-layer) */

SDEV_OFFLINE = 6, /* Device offlined (by error han

dling 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. */

scsi.iodispatching

Fires when the SCSI mid layer dispatches a SCSI command to the low level driver

Arguments:

host_no

The host number

channel

The channel number

lun

The lun number

dev_id

The scsi device id

device_state

The current state of the device.

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,

request_buffer

The request buffer address

req_bufflen

The request buffer length

scsi.iodone

Fires when a SCSI command is done by low level driver and enqueued into the done queue.

Arguments:

host_no

The host number

channel

The channel number

lun

The lun number

dev_id

The scsi device id

device_state

The current state of the device

data_direction

The data_direction specifies whether this command is from/to

the device.

scsi.iocompleted

Fires when SCSI mid layer runs the completion processing for block device I/O requests

Arguments:

host_no

The host number

channel

The channel number

lun

The lun number

dev_id

The scsi device id

device_state

The current state of the device

data_direction

The data_direction specifies whether this command is from/to

the device.

goodbytes

The bytes completed.

SEE ALSO

stap(1), stapprobes(5),

IBM 2009-03-14 STAPPROBES.SCSI(5)