scsi_scan_host() -------+
|
slave_alloc()
- slave_configure() --> scsi_adjust_queue_depth()
+ slave_configure() --> scsi_change_queue_depth()
|
slave_alloc()
slave_configure()
------------------------------------------------------------
If the LLD wants to adjust the default queue settings, it can invoke
-scsi_adjust_queue_depth() in its slave_configure() routine.
+scsi_change_queue_depth() in its slave_configure() routine.
*** For scsi devices that the mid level tries to scan but do not
respond, a slave_alloc(), slave_destroy() pair is called.
scsi_add_device() ------+
|
slave_alloc()
- slave_configure() [--> scsi_adjust_queue_depth()]
+ slave_configure() [--> scsi_change_queue_depth()]
------------------------------------------------------------
In a similar fashion, an LLD may become aware that a SCSI device has been
| scsi_register()
|
slave_alloc()
- slave_configure() --> scsi_adjust_queue_depth()
+ slave_configure() --> scsi_change_queue_depth()
slave_alloc() ***
slave_destroy() ***
|
slave_destroy() ***
------------------------------------------------------------
-The mid level invokes scsi_adjust_queue_depth() with "cmd_per_lun" for that
+The mid level invokes scsi_change_queue_depth() with "cmd_per_lun" for that
host as the queue length. These settings can be overridden by a
slave_configure() supplied by the LLD.
Summary:
scsi_add_device - creates new scsi device (lu) instance
scsi_add_host - perform sysfs registration and set up transport class
- scsi_adjust_queue_depth - change the queue depth on a SCSI device
+ scsi_change_queue_depth - change the queue depth on a SCSI device
scsi_bios_ptable - return copy of block device's partition table
scsi_block_requests - prevent further commands being queued to given host
scsi_host_alloc - return a new scsi_host instance whose refcount==1
/**
- * scsi_adjust_queue_depth - allow LLD to change queue depth on a SCSI device
+ * scsi_change_queue_depth - allow LLD to change queue depth on a SCSI device
* @sdev: pointer to SCSI device to change queue depth on
* @tags Number of tags allowed if tagged queuing enabled,
* or number of commands the LLD can queue up
* Defined in: drivers/scsi/scsi.c [see source code for more notes]
*
**/
-void scsi_adjust_queue_depth(struct scsi_device *sdev, int tags)
+int scsi_change_queue_depth(struct scsi_device *sdev, int tags)
/**
for disk firmware uploads.
cmd_per_lun - maximum number of commands that can be queued on devices
controlled by the host. Overridden by LLD calls to
- scsi_adjust_queue_depth().
+ scsi_change_queue_depth().
unchecked_isa_dma - 1=>only use bottom 16 MB of ram (ISA DMA addressing
restriction), 0=>can use full 32 bit (or better) DMA
address space
Instances of this structure convey SCSI commands to the LLD and responses
back to the mid level. The SCSI mid level will ensure that no more SCSI
commands become queued against the LLD than are indicated by
-scsi_adjust_queue_depth() (or struct Scsi_Host::cmd_per_lun). There will
+scsi_change_queue_depth() (or struct Scsi_Host::cmd_per_lun). There will
be at least one instance of struct scsi_cmnd available for each SCSI device.
Members of interest:
cmnd - array containing SCSI command