SCSI_PROBE(9F) Kernel Functions for Drivers SCSI_PROBE(9F)

scsi_probe - utility for probing a scsi device

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

illumos DDI specific (illumos DDI).

devp

Pointer to a scsi_device(9S) structure

waitfunc

NULL_FUNC or SLEEP_FUNC

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 can 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.

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.

scsi_probe() is normally called from the target driver's probe(9E) or attach(9E) routine. In any case, this routine should not be called from interrupt context, because it can sleep waiting for memory to be allocated.

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);

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

A waitfunc function other than NULL_FUNC or SLEEP_FUNC is not supported and may have unexpected results.

February 26, 2002 OmniOS