xref: /titanic_50/usr/src/man/man9f/ddi_intr_get_cap.9f (revision 3d729aecc03ea6ebb9bd5d56b8dccd24f57daa41)
te
Copyright (c) 2005, Sun Microsystems, Inc. All Rights Reserved.
The contents of this file are subject to the terms of the Common Development and Distribution License (the "License"). You may not use this file except in compliance with the License.
You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE or http://www.opensolaris.org/os/licensing. See the License for the specific language governing permissions and limitations under the License.
When distributing Covered Code, include this CDDL HEADER in each file and include the License file at usr/src/OPENSOLARIS.LICENSE. If applicable, add the following below this CDDL HEADER, with the fields enclosed by brackets "[]" replaced with your own identifying information: Portions Copyright [yyyy] [name of copyright owner]
DDI_INTR_GET_CAP 9F "Apr 20, 2005"
NAME
ddi_intr_get_cap, ddi_intr_set_cap - get or set interrupt capabilities for a given interrupt type
SYNOPSIS

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

int ddi_intr_get_cap(ddi_intr_handle_t h, int *flagsp);

int ddi_intr_set_cap(ddi_intr_handle_t h, int flags);
INTERFACE LEVEL

Solaris DDI specific (Solaris DDI).

PARAMETERS

ddi_intr_get_cap() h

DDI interrupt handle

flagsp

Pointer to the capability flags returned for this handle

ddi_intr_set_cap() h

DDI interrupt handle

flags

Contains the capability flag to be set

DESCRIPTION

The ddi_intr_get_cap() function returns the interrupt capability flags for the interrupt handle h. Upon a successful return, the flags are returned in the integer pointed to by the flagsp argument.

These flags are typically combinations of the following: DDI_INTR_FLAG_EDGE

For discrete interrupts, the host supports edge type of trigger. This flag is not returned for DDI_INTR_TYPE_MSI or DDI_INTR_TYPE_MSIX interrupt types. This is a read-write (RW) flag.

DDI_INTR_FLAG_LEVEL

For discrete interrupts the host supports level, edge, or both types of triggers. This flag is not returned for DDI_INTR_TYPE_MSI or DDI_INTR_TYPE_MSIX interrupt types.

DDI_INTR_FLAG_MASKABLE

The interrupt can be masked either by the device or by the host bridge, or optionally by the host. This is a read-only (RO) flag.

DDI_INTR_FLAG_PENDING

The interrupt supports an interrupt pending bit. This is a read-only (RO) flag.

DDI_INTR_FLAG_BLOCK

All interrupts of the given type must be block-enabled and are not individually maskable. This is a read-only (RO) flag.

The ddi_intr_set_cap() function allows a driver to specify the capability flags for the interrupt handle h. Only DDI_INTR_FLAG_LEVEL and DDI_INTR_FLAG_EDGE flags can be set. Some devices can support both level and edge capability and either can be set by using the ddi_intr_set_cap() function. Setting the capability flags is device and platform dependent.

The ddi_intr_set_cap() function can be called after interrupts are allocated and prior to adding the interrupt handler. For all other times it returns failure.

RETURN VALUES

The ddi_intr_get_cap() and ddi_intr_set_cap() 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_cap() and ddi_intr_set_cap() functions can be called from either user or 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_block_enable(9F), ddi_intr_get_nintrs(9F), ddi_intr_get_pending(9F), ddi_intr_get_supported_types(9F), ddi_intr_set_mask(9F)

Writing Device Drivers

NOTES

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.