User Tools

Site Tools


solaris:getinfo.9e

getinfo


NAME

getinfo - get device driver information

SYNOPSIS

#include <sys/ddi.h>
#include <sys/sunddi.h>

int prefixgetinfo(dev_info_t *dip, ddi_info_cmd_t cmd,
void
*arg, void **resultp);

INTERFACE LEVEL

Solaris DDI specific (Solaris DDI). This entry point is required for drivers which export cb_ops(9S) entry points.

ARGUMENTS

dip

Do not use.

cmd

Command argument - valid command values are DDI_INFO_DEVT2DEVINFO and DDI_INFO_DEVT2INSTANCE.

arg

Command specific argument.

resultp

Pointer to where the requested information is stored.

DESCRIPTION

When cmd is set to DDI_INFO_DEVT2DEVINFO, getinfo() should return the dev_info_t pointer associated with the dev_t arg. The dev_info_t pointer should be returned in the field pointed to by resultp.

When cmd is set to DDI_INFO_DEVT2INSTANCE, getinfo() should return the instance number associated with the dev_t arg. The instance number should be returned in the field pointed to by resultp.

Drivers which do not export cb_ops(9S) entry points are not required to provide a getinfo() entry point, and may use nodev(9F) in the devo_getinfo field of the dev_ops(9S) structure. A SCSI HBA driver is an example of a driver which is not required to provide cb_ops(9S) entry points.

RETURN VALUES

getinfo() should return:

DDI_SUCCESS

on success.

DDI_FAILURE

on failure.

EXAMPLES

Example 1 getinfo() implementation

/*ARGSUSED*/
static int
rd_getinfo(dev_info_t *dip, ddi_info_cmd_t infocmd, void *arg, \
void **resultp)
{
/* Note that in this simple example
* the minor number is the instance

* number.

*/

devstate_t *sp;
int error = DDI_FAILURE;
switch (infocmd) {
case DDI_INFO_DEVT2DEVINFO:
if 1)) != NULL) {
*resultp = sp→devi;
error = DDI_SUCCESS;
} else
*result = NULL;
break;

case DDI_INFO_DEVT2INSTANCE:
*resultp = (void *) (uintptr_t) getminor2). A driver that only supports style-2 minor nodes can use ddi_no_info(9F) for its getinfo() implementation. For drivers that do not follow these rules, the results of a modunload(8) of the driver or a cfgadm(8) remove of hardware controlled by the driver are undefined.


1)
sp = ddi_get_soft_state(statep,
getminor((dev_t) arg
2)
dev_t) arg);
error = DDI_SUCCESS;
break;
} return (error);
} ===== SEE ALSO ===== ddi_no_info(9F), nodev(9F), cb_ops(9S), dev_ops(9S) Writing Device Drivers in Oracle Solaris 11.4 ===== NOTES ===== Non-gld(4D)-based DLPI network streams drivers are encouraged to switch to gld(4D). Failing this, a driver that creates DLPI style-2 minor nodes must specify CLONE_DEV for its style-2 ddi_create_minor_node(9F) nodes and use qassociate(9F). A driver that supports both style-1 and style-2 minor nodes should return DDI_FAILURE for DDI_INFO_DEVT2INSTANCE and DDI_INFO_DEVT2DEVINFO getinfo() calls to style-2 minor nodes. (The correct association is already established by qassociate(9F
solaris/getinfo.9e.txt · Last modified: 2023/07/19 08:58 by A User Not Logged in