sdi_driver_desc(D4sdi)

sdi_driver_desc -- SDI layered driver description

Syntax

   #include <sys/types.h>
   #include <sys/sdi.h>
   #include <sys/ddi.h>

Description

The sdi_driver_desc structure provides information about an SDI HBA or target driver that is accessed by a layered driver.

Structure definition

The members of the sdi_driver_desc structure that can be used by client drivers are:

   char	sdd_modname[ NAMESZ ];
   int 	sdd_precedence;
   struct	dev_cfg *sdd_dev_cfg;
   uint_t	sdd_dev_cfg_size;
   int 	(*sdd_config_entry)();
   ulong_t sdd_minors_per;

Structure members

The members are defined as:

sdd_modname[ NAMESZ ]

The modname of the driver in question. This is obtained from the driver's Space.c file using the MODNAME value.

sdd_precedence

The relative precedence order of this driver to the rest of the layered drivers in the SDI I/O stack. Valid values are:

SDI_STACK_BASE: Used for HBA and target drivers.
SDI_STACK_ALPHA: Used for the deflection driver.
SDI_STACK_BETA: Used for the DARDAC driver.
SDI_STACK_GAMMA: Used for the MPIO driver.
SDI_STACK_DELTA: Used for the partition driver.
SDI_STACK_VTOC: Highest precedence, used for the VTOC driver.

sdd_dev_cfg

Pointer to a dev_cfg structure as defined in the sdi_comm.h header file. The values in that structure are initialized to define the classes of devices for which this driver receives CFG_ADD events; see config(D2sdi).

sdd_dev_cfg_size

The number of entries in the dev_cfg structure to which the sdd_dev_cfg member points.

sdd_config_entry

The name of the config(D2sdi) entry point for the layered driver.

sdd_minors_per

The number of channels that the driver uses for each device. This value is 1 for most drivers in the I/O stack other than the driver at the VTOC level.

Usage

The sdi_driver_desc structure is pointed to by the ow_sddp member of the owner(D4sdi) structure.

Hardware applicability

All

Version applicability

sdi: 4 layered drivers.

Future directions

Additional values for the sdi_precedence member may be defined at a later date, and the relationship between existing values is not guaranteed to be preserved between operating system releases.