Sun Microsystems, Inc.
spacerspacer
spacer   www.sun.com docs.sun.com | | |  
spacer
black dot
   
A   B   C   D   E   F   G   H   I   J   K   L   M   N   O   P   Q   R   S   T   U   V   W   X   Y   Z
    
 
Kernel Functions for Driversscsi_probe(9F)

NAME

 scsi_probe - utility for probing a scsi device

SYNOPSIS

  
#include <sys/scsi/scsi.h>
int scsi_probe(struct scsi_device *devp, int (*waitfunc);

INTERFACE LEVEL

 

Solaris DDI specific (Solaris DDI).

PARAMETERS

 
devp
Pointer to a scsi_device(9S) structure
waitfunc
NULL_FUNC or SLEEP_FUNC

DESCRIPTION

 

scsi_probe() determines whether a target/lun is present and sets up the scsi_device structure with inquiry data.

scsi_probe() uses the SCSI Inquiry command to test if the device exists. It may retry the Inquiry command as appropriate. If scsi_probe() is successful, it will allocate space for the scsi_inquiry structure and assign the address to the sd_inq member of the scsi_device(9S) structure. scsi_probe() will then fill in this scsi_inquiry(9S) structure and return SCSIPROBE_EXISTS. If scsi_probe() is unsuccessful, it returns SCSIPROBE_NOMEM in spite of callback set to SLEEP_FUNC.

scsi_unprobe(9F) is used to undo the effect of scsi_probe().

If the target is a non-CCS device, SCSIPROBE_NONCCS will be returned.

waitfunc indicates what the allocator routines should do when resources are not available; the valid values are:

NULL_FUNC
Do not wait for resources. Return SCSIPROBE_NOMEM or SCSIPROBE_FAILURE
SLEEP_FUNC
Wait indefinitely for resources.

RETURN VALUES

 

scsi_probe() returns:

SCSIPROBE_BUSY
Device exists but is currently busy.
SCSIPROBE_EXISTS
Device exists and inquiry data is valid.
SCSIPROBE_FAILURE
Polled command failure.
SCSIPROBE_NOMEM
No space available for structures.
SCSIPROBE_NOMEM_CB
No space available for structures but callback request has been queued.
SCSIPROBE_NONCCS
Device exists but inquiry data is not valid.
SCSIPROBE_NORESP
Device does not respond to an INQUIRY.

CONTEXT

 

scsi_probe() is normally called from the target driver's probe(9E) or attach(9E) routine. If waitfunc is SLEEP_FUNC, then this routine may only be called from user-level code. Otherwise, it may be called from either user or interrupt level.

EXAMPLES

 Example 1. Using scsi_probe
 

  
    switch (scsi_probe(devp, NULL_FUNC)) {
    default:
    case SCSIPROBE_NORESP:
    case SCSIPROBE_NONCCS:
    case SCSIPROBE_NOMEM:
    case SCSIPROBE_FAILURE:
    case SCSIPROBE_BUSY:
            break;
    case SCSIPROBE_EXISTS:
            switch (devp->sd_inq->inq_dtype) {
            case DTYPE_DIRECT:
                    rval = DDI_PROBE_SUCCESS;
                    break;
            case DTYPE_RODIRECT:
                    rval = DDI_PROBE_SUCCESS;
                    break;
            case DTYPE_NOTPRESENT:
            default:
                    break;
            }
    }
    scsi_unprobe(devp);

SEE ALSO

 

attach(9E), probe(9E), scsi_slave(9F), scsi_unprobe(9F), scsi_unslave(9F), scsi_device(9S), scsi_inquiry(9S)

ANSI Small Computer System Interface-2 (SCSI-2)

Writing Device Drivers

NOTES

 

A waitfunc function other than NULL_FUNC or SLEEP_FUNC is not supported and may have unexpected results.
SunOS 5.9Go To TopLast Changed 24 Feb 1994
 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.