How to perform runtime pm for usb hcds?

Hi,
  I saw usb_hcd_pci_suspend() is stored in several HCD's struct
pci_driver as suspend, and usb_hcd_pci_resume() is stored as
resume().From user's perspective, is it possible to call these methods
manually?I mean,I am using kdb the trace these methods,and I wanna set
a breakpoint in the point whenever these two methods are invoked.
That's to say, once either of these two methods are invoked, then the
system will drop into kdb, so that I can do some analysis on these two
methods. But the problem is, from user space,what shall I do to
trigger these two methods?

Thanks
Jason

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