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BUS_BIND_INTR, bus_bind_intr — bind an interrupt resource to a specific
BUS_BIND_INTR(device_t dev, device_t child, struct resource *irq,
bus_bind_intr(device_t dev, struct resource *irq, int cpu);
The BUS_BIND_INTR() method allows an interrupt resource to be pinned to a
specific CPU. The interrupt resource must have an interrupt handler
attached via BUS_SETUP_INTR(9). The cpu parameter corresponds to the ID
of a valid CPU in the system. Binding an interrupt restricts the
cpuset(2) of any associated interrupt threads to only include the
specified CPU. It may also direct the low-level interrupt handling of
the interrupt to the specified CPU as well, but this behavior is
platform-dependent. If the value NOCPU is used for cpu, then the
interrupt will be “unbound” which restores any associated interrupt
threads back to the default cpuset.
Non-sleepable locks such as mutexes should not be held across calls to
The bus_bind_intr() function is a simple wrapper around BUS_BIND_INTR().
Note that currently there is no attempt made to arbitrate between
multiple bind requests for the same interrupt from either the same device
or multiple devices. There is also no arbitration between interrupt
binding requests submitted by userland via cpuset(2) and BUS_BIND_INTR().
The most recent binding request is the one that will be in effect.
BUS_SETUP_INTR(9), cpuset(2), device(9)
The BUS_BIND_INTR() method and bus_bind_intr() functions first appeared
in FreeBSD 7.2.