NAME¶

tapset::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 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. */

 

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(3stap)