man/man9f/ddi_intr_get_pri.9f

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 DDI_INTR_GET_PRI 9F "Jun 04, 2007"
 NAME
ddi_intr_get_pri, ddi_intr_set_pri - get or set priority of a given interrupt
 SYNOPSIS
#include <sys/types.h>
#include <sys/conf.h>
#include <sys/ddi.h>
#include <sys/sunddi.h>

int ddi_intr_get_pri(ddi_intr_handle_t h, uint_t *prip);


int ddi_intr_set_pri(ddi_intr_handle_t h, uint_t pri);


 INTERFACE LEVEL
illumos DDI specific (illumos DDI).
 PARAMETERS
ddi_intr_get_pri()
h

DDI interrupt handle


prip

Pointer to the priority returned for this handle


ddi_intr_set_pri()
h

DDI interrupt handle


pri

Contains the priority to be set


 DESCRIPTION
The ddi_intr_get_pri() function returns the current priority of the
interrupt handle h of a given device. Upon a successful return,
prip points to a small integer value, typically in the
DDI_INTR_PRI_MIN...DDI_INTR_PRI_MAX range, that represents the
current software priority setting for the interrupt. See <sys/ddi_intr.h>
for values of DDI_INTR_PRI_MIN or DDI_INTR_PRI_MAX.

The ddi_intr_get_pri() function can be called any time, even if the
driver adds an interrupt handler for the interrupt specification.

The software priority returned from ddi_intr_get_pri() can be used in
calls to mutex_init() and rw_init().

The ddi_intr_set_pri() function sets the priority pri of the
interrupt handle h of a given device. The function validates that the
argument is within the supported range.

The ddi_intr_set_pri() function can only be called prior to adding the
interrupt handler or when an interrupt handler is unassigned. DDI_FAILURE
is returned in all other cases.
 RETURN VALUES
The ddi_intr_get_pri() and ddi_intr_set_pri() functions return:
DDI_SUCCESS

On success.


DDI_EINVAL

On encountering invalid input parameters.


DDI_FAILURE

On any implementation specific failure.


DDI_ENOTSUP

On device not supporting operation.


 CONTEXT
The ddi_intr_get_pri() and ddi_intr_set_pri() functions can be
called from kernel non-interrupt context.
 ATTRIBUTES
See attributes(5) for descriptions of the following attributes:


ATTRIBUTE TYPE ATTRIBUTE VALUE
Interface Stability Committed


 SEE ALSO
attributes(5), ddi_intr_alloc(9F), ddi_intr_enable(9F),
mutex_init(9F), rw_init(9F)

Writing Device Drivers
 NOTES
The priority returned from ddi_intr_get_pri() should be typecast by
calling the DDI_INTR_PRI macro before passing it onto
mutex_init(9F).

Consumers of these interfaces should verify that the return value is not equal
to DDI_SUCCESS. Incomplete checking for failure codes could result in
inconsistent behavior among platforms.