SCSI_ADD_SINGLE_DEVI(9) SCSI mid layer SCSI_ADD_SINGLE_DEVI(9)NAME
scsi_add_single_device - Respond to user request to probe for/add device
SYNOPSIS
int scsi_add_single_device(uint host, uint channel, uint id, uint lun);
ARGUMENTS
host
user-supplied decimal integer
channel
user-supplied decimal integer
id
user-supplied decimal integer
lun
user-supplied decimal integer
DESCRIPTION
called by writing "scsi add-single-device" to /proc/scsi/scsi.
does scsi_host_lookup and either user_scan if that transport type supports it, or else scsi_scan_host_selected
NOTE
this seems to be aimed exclusively at SCSI parallel busses.
AUTHORS
James Bottomley <James.Bottomley@hansenpartnership.com>
Author.
Rob Landley <rob@landley.net>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 SCSI_ADD_SINGLE_DEVI(9)
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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 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)