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 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)




IBM                                                                                                          TAPSET::SCSI(3stap)