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

ddi_dev_is_sid - tell whether a device is self-identifying

#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>
int ddi_dev_is_sid(dev_info_t *dip);

illumos DDI specific (illumos DDI).

A pointer to the device's dev_info structure.

The ddi_dev_is_sid() function tells the caller whether the device described by dip is self-identifying, that is, a device that can unequivocally tell the system that it exists. This is useful for drivers that support both a self-identifying as well as a non-self-identifying variants of a device (and therefore must be probed).

Device is self-identifying.


Device is not self-identifying.

The ddi_dev_is_sid() function can be called from user, interrupt, or kernel context.

1   ...
2   int
3   bz_probe(dev_info_t *dip)
4   {
5	...
6	if (ddi_dev_is_sid(dip) == DDI_SUCCESS) {
7		/*
8		 * This is the self-identifying version (OpenBoot).
9		 * No need to probe for it because we know it is there.
10		 * The existence of dip && ddi_dev_is_sid() proves this.
11		 */
12			return (DDI_PROBE_DONTCARE);
13	}
14	/*
15	 * Not a self-identifying variant of the device. Now we have to
16	 * do some work to see whether it is really attached to the
17	 * system.
18	 */
19  ...

probe(9E) Writing Device Drivers
January 16, 2006 OmniOS