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TAPSET::SCSI(3stap)					   TAPSET::SCSI(3stap)

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 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(3stap)

IBM							   TAPSET::SCSI(3stap)

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