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NAME

stapprobes.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

Index

NAME

DESCRIPTION

SEE ALSO

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