Copyright (c) 2016 John H. Baldwin <jhb@FreeBSD.org>
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.Dd March 1, 2016 .Dt BUS_GET_CPUS 9 .Os .Sh NAME .Nm BUS_GET_CPUS , .Nm bus_get_cpus .Nd "request a set of device-specific CPUs" .Sh SYNOPSIS n sys/param.h n sys/bus.h n sys/cpuset.h .Ft int .Fo BUS_GET_CPUS .Fa "device_t dev" "device_t child" "enum cpu_sets op" "size_t setsize" .Fa "cpuset_t *cpuset" .Fc .Ft int .Fo bus_get_cpus .Fa "device_t dev" "enum cpu_sets op" "size_t setsize" "cpuset_t *cpuset" .Fc .Sh DESCRIPTION The .Fn BUS_GET_CPUS method queries the parent bus device for a set of device-specific CPUs. The .Fa op argument specifies which set of CPUs to retrieve. If successful, the requested set of CPUs are returned in .Fa cpuset . The .Fa setsize argument specifies the size in bytes of the set passed in .Fa cpuset .
p .Fn BUS_GET_CPUS supports querying different types of CPU sets via the .Fa op argument. Not all set types are supported for every device. If a set type is not supported, .Fn BUS_GET_CPUS fails with .Er EINVAL . These set types are supported: l -tag -width ".Dv LOCAL_CPUS" t Dv 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
q NUMA , this will return the set of CPUs in that memory domain. t Dv 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. .El
p The .Fn bus_get_cpus function is a simple wrapper around .Fn BUS_GET_CPUS . .Sh RETURN VALUES Zero is returned on success, otherwise an appropriate error is returned. .Sh SEE ALSO .Xr cpuset 2 , .Xr BUS_BIND_INTR 9 , .Xr device 9 .Sh HISTORY The .Fn BUS_GET_CPUS method and .Fn bus_get_cpus function first appeared in .Fx 11.0 .