The ranges parent bus address may just be a tag to the entry in the parent
node. Take this in to account by searching until we find the range for the
root node.

Differential Revision:	https://reviews.freebsd.org/D1160
Reviewed by:	ian
Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
Add L2-cache writeback/flush operations. Supported 32,128-byte line-size,
else ignored. Cavium Networks also ignored as it has non-standard config
registers.

Obtained from:	NetBSD
Sponsored by:	DARPA, AFRL
Actually, that was a bad idea. Go back to MAXPARTITIONS.

Submitted by: bruce
Remove residual xpt_release_device() call left after r272406 cleanup.

Excessive release here could trigger use-after-free condition and kernel
panic on LUN 0 disconnect.

MFC after:	1 week
Various fixes for wl(4):
- Don't recurse driver mutex.
- Don't hold driver mutex across fubyte/subyte.
- Replace fubyte/subyte loops with copyin/copyout calls.
- Use relatively sane locking in wl_ioctl().
- Use bus space accessors instead of in*()/out*().
- Use callout(9) instead of timeout(9).
- Stop watchdog timer in detach and don't hold mutex across
  bus_teardown_intr().
- Use device_printf() and if_printf().
- De-spl().

Tested by:	no one
Lock spic(4) and mark it MPSAFE:
- Add a per-softc mutex as a driver lock.
- Use callout(9) instead of timeout(9).
- Set softc pointer in si_drv1 of cdev instead of looking softc
  up via devclass in cdev methods.

Tested by:	no one
Lock the scsi_low code and the drivers which use it along with other
related cleanups:
- Require each driver to initalize a mutex in the scsi_low_softc that
  is shared with the scsi_low code.  This mutex is used for CAM SIMs,
  timers, and interrupt handlers.
- Replace the osdep function switch with direct calls to the relevant
  CAM functions and direct manipulation of timers via callout(9).
- Collapse the CAM-specific scsi_low_osdep_interface substructure
  directly into scsi_low_softc.
- Use bus_*() instead of bus_space_*().
- Return BUS_PROBE_DEFAULT from probe routines instead of 0.
- No need to zero softcs.
- Pass 0ul and ~0ul instead of 0 and ~0 to bus_alloc_resource().
- Spell "dettach" as "detach".
- Remove unused 'dvname' variables.
- De-spl().

Tested by:	no one
Back our r274750 until discussions on proper fix are over.