scsi_slave

- utility for SCSI target drivers to establish the presence of a target

Synopsis

#include <sys/scsi/scsi.h> 

int scsi_slave(struct scsi_device *devp, int (*callback)(void));

Interface Level

The scsi_slave() function is obsolete. This function has been replaced by scsi_probe(9F).

Parameters

devp

Pointer to a scsi_device(9S) structure.

callback

Pointer to a callback function, NULL_FUNC or SLEEP_FUNC.

Description

scsi_slave() checks for the presence of a SCSI device. Target drivers may use this function in their probe(9E) routines. scsi_slave() determines if the device is present by using a Test Unit Ready command followed by an Inquiry command. If scsi_slave() is successful, it will fill in the scsi_inquiry structure, which is the sd_inq member of the scsi_device(9S) structure, and return SCSI_PROBE_EXISTS. This information can be used to determine if the target driver has probed the correct SCSI device type. callback indicates what the allocator routines should do when DMA resources are not available:

NULL_FUNC

Do not wait for resources. Return a NULL pointer.

SLEEP_FUNC

Wait indefinitely for resources.

Other Values

callback points to a function which is called when resources may have become available. callback must return either 0 (indicating that it attempted to allocate resources but again failed to do so), in which case it is put back on a list to be called again later, or 1 indicating either success in allocating resources or indicating that it no longer cares for a retry.

Return Values

scsi_slave() returns:

SCSIPROBE_NOMEM

No space available for structures.

SCSIPROBE_EXISTS

Device exists and inquiry data is valid.

SCSIPROBE_NONCCS

Device exists but inquiry data is not valid.

SCSIPROBE_FAILURE

Polled command failure.

SCSIPROBE_NORESP

No response to TEST UNIT READY.

Context

scsi_slave() 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.

Attributes

See attributes(5) for a description of the following attributes:

See Also

attributes(5), attach(9E), probe(9E), ddi_iopb_alloc(9F), makecom(9F), scsi_dmaget(9F), scsi_ifgetcap(9F), scsi_pktalloc(9F), scsi_poll(9F), scsi_probe(9F), scsi_device(9S)

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

Writing Device Drivers

Notes

The scsi_slave() function is obsolete and will be discontinued in a future release. This function has been replaced by scsi_probe(9F).