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| BUS_GET_CPUS(9) | FreeBSD Kernel Developer's Manual | BUS_GET_CPUS(9) |
NAME
BUS_GET_CPUS, bus_get_cpus
—
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
#include <sys/cpuset.h>
int
BUS_GET_CPUS(device_t dev,
device_t child, enum cpu_sets
op, size_t setsize, cpuset_t
*cpuset);
int
bus_get_cpus(device_t dev,
enum cpu_sets op, size_t
setsize, cpuset_t *cpuset);
DESCRIPTION
TheBUS_GET_CPUS() method queries the parent bus device
for a set of device-specific CPUs. The op argument
specifies which set of CPUs to retrieve. If successful, the requested set of
CPUs are returned in cpuset. The
setsize argument specifies the size in bytes of the set
passed in cpuset.
BUS_GET_CPUS() supports querying different
types of CPU sets via the op argument. Not all set
types are supported for every device. If a set type is not supported,
BUS_GET_CPUS() fails with
EINVAL. These set types are supported:
LOCAL_CPUS- The set of CPUs that are local to the device. If a device is closer to a specific memory domain in a non-uniform memory architecture system (NUMA), this will return the set of CPUs in that memory domain.
INTR_CPUS- The preferred set of CPUs that this device should use for device interrupts. This set type must be supported by all bus drivers.
The bus_get_cpus() function is a simple
wrapper around BUS_GET_CPUS().
RETURN VALUES
Zero is returned on success, otherwise an appropriate error is returned.SEE ALSO
cpuset(2), BUS_BIND_INTR(9), device(9)HISTORY
TheBUS_GET_CPUS() method and
bus_get_cpus() function first appeared in
FreeBSD 11.0.
| March 1, 2016 | FreeBSD 13.1-RELEASE |
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