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 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)