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)

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