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

Solaris DDI specific (Solaris 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:

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.