BUS_GET_CPUS(9)        FreeBSD Kernel Developer's Manual       BUS_GET_CPUS(9)

NAME
     BUS_GET_CPUS, bus_get_cpus - request a set of device-specific 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
     The BUS_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
     The BUS_GET_CPUS() method and bus_get_cpus() function first appeared in
     FreeBSD 11.0.

FreeBSD 13.1-RELEASE-p6          March 1, 2016         FreeBSD 13.1-RELEASE-p6