NAME
bus_adjust_resource — adjust resource allocated from a parent bus
SYNOPSIS
#include <sys/param.h>
#include <sys/bus.h>
#include
<machine/bus.h>
#include <sys/rman.h>
#include <machine/resource.h>
int
bus_adjust_resource(device_t dev, int type, struct resource *r, rman_res_t start, rman_res_t end);
DESCRIPTION
This function is used to ask the parent bus to adjust the resource range assigned to an allocated resource. The resource r should have been allocated by a previous call to bus_alloc_resource(9). The new resource range must overlap the existing range of r. The type argument should match the type argument passed to bus_alloc_resource(9) when the resource was initially allocated.
Note that none of the constraints of the original allocation request such as alignment or boundary restrictions are checked by bus_adjust_resource(). It is the caller’s responsibility to enforce any such requirements.
RETURN VALUES
The bus_adjust_resource() method returns zero on success or an error code on failure.
EXAMPLES
Grow an existing memory resource by 4096 bytes.
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struct resource *res; |
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int error; |
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error = bus_adjust_resource(dev, SYS_RES_MEMORY, res, |
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rman_get_start(res), rman_get_end(res) + 0x1000); |
ERRORS
bus_adjust_resource() will fail if:
[EINVAL]
The dev device does not have a parent device.
[EINVAL]
The r resource is a shared resource.
[EINVAL]
The new address range does not overlap with the existing address range of r.
[EBUSY]
The new address range conflicts with another allocated resource.
SEE ALSO
bus_alloc_resource(9), bus_release_resource(9), device(9), driver(9)
BSD April 23, 2016 BSD