DDI-FORCEATTACH(9P) Kernel Properties for Drivers DDI-FORCEATTACH(9P)

NAME

ddi-forceattach, ddi-no-autodetach - properties controlling driver
attach/detach behavior

DESCRIPTION

Solaris device drivers are attached by devfsadm(8) and by the kernel
in response to open(2) requests from applications. Drivers not
currently in use can be detached when the system experiences memory
pressure. The ddi-forceattach and ddi-no-autodetach properties can be
used to customize driver attach/detach behavior.


The ddi-forceattach is an integer property, to be set globally by
means of the driver.conf(5) file. Drivers with this property set to 1
are loaded and attached to all possible instances during system
startup. The driver will not be auto-detached due to system memory
pressure.


The ddi-no-autodetach is an integer property to be set globally by
means of the driver.conf(5) file or created dynamically by the driver
on a per-instance basis with ddi_prop_update_int(9F). When this
property is set to 1, the kernel will not auto-detach driver due to
system memory pressure.


Note that ddi-forceattach implies ddi-no-autodetach. Setting either
property to a non-integer value or an integer value not equal to 1
produces undefined results. These properties do not prevent driver
detaching in response to reconfiguration requests, such as executing
commands cfgadm(8), modunload(8), rem_drv(8), and update_drv(8).

SEE ALSO

driver.conf(5)


Writing Device Drivers

May 18, 2001 DDI-FORCEATTACH(9P)