Copy head (r256279) to stable/10 as part of the 10.0-RELEASE cycle.

Approved by: re (implicit)
Sponsored by: The FreeBSD Foundation

options DPT_HANDLE_TIMEOUTS hasn't worked since dpt(4) was converted to CAM
somewhere around svn r39402 to r39234.

I don't know of anyone who really wants to test these changes, but they
only remove the deprecated code in question. This shreds the driver down a
bit and *removes* options from the kernel configs.

These don't appear to be referenced in the man page, so no need to check it
there.

PR: kern/44587
Obtained from: Yahoo! Inc.
MFC after: 2 weeks

Add locking to the dpt(4) driver and mark it MPSAFE.
- Use device_printf() and device_get_unit() instead of storing the unit
number in the softc.
- Remove use of explicit bus space handles and tags.
- Remove the global dpt_softcs list and use devclass_get_device() instead.
- Use pci_enable_busmaster() rather than frobbing the PCI command register
directly.

Tested by: no one

Fix the following clang warning in dpt(4):

sys/dev/dpt/dpt_scsi.c:612:18: error: implicit truncation from 'int' to bitfield changes value from -2 to 2 [-Werror,-Wconstant-conversion]
dpt->cache_type = DPT_CACHE_WRITEBACK;
^ ~~~~~~~~~~~~~~~~~~~

by defining DPT_CACHE_WRITEBACK as 2, since dpt_softc::cache_type is an
unsigned bitfield. No binary change.

MFC after: 1 week

Get rid of #ident, GCC 4.4 warns about it being deprecated.

OK-ed by: scottl

Prepare for future integration between CAM and newbus. xpt_bus_register
now takes a device_t to be the parent of the bus that is being created.
Most SIMs have been updated with a reasonable argument, but a few exceptions
just pass NULL for now. This argument isn't used yet and the newbus
integration likely won't be ready until after 7.0-RELEASE.

Wrap the EISA-specific parts of the dpt(4) and si(4) back-ends in
the newly added DEV_EISA. This is done so that these back-ends can
be compiled on platforms not providing in{b,w,l}()/out{b,w,l}() and
friends (but may wish to use them together with bus front-ends other
than the EISA one).

Start each of the license/copyright comments with /*-, minor shuffle of lines

Device megapatch 1/6:

Free approx 86 major numbers with a mostly automatically generated patch.

A number of strategic drivers have been left behind by caution, and a few
because they still (ab)use their major number.

- Track resources in our softc.
- Sanitize dpt_alloc().
- Add helper functions for resource alloc/release.
- Add detach method.
- Relocate definition of devclass_t.
- Move some debugging output behind bootverbose.
- Implement an identify method for ISA devices
but don't use it right now.

Fix a couple of bogus enums.

Fix typo: compatability -> compatibility.

Compatability is not an existing english word.

Back out the previous change to the queue(3) interface.
It was not discussed and should probably not happen.

Requested by: msmith and others

Change the way that the queue(3) structures are declared; don't assume that
the type argument to *_HEAD and *_ENTRY is a struct.

Suggested by: phk
Reviewed by: phk
Approved by: mdodd

- Convert dpt_pci.c to newbus.
- Add support for ISA based DPT adapters (this doesn't quite work yet).
- Sync dpt_eisa.c with my local copy.
- Simplify how EISA IDs are matched.
- Prototype.
- Formatting nits.
- Conform to how I do things in dpt_pci.c/dpt_isa.c.
- Modify dpt_scsi.c:dpt_alloc() to DTRT with newbus.
- Add some comments to dpt_scsi.c:dpt_pio_get_conf().
- Add additional check to dpt_scsi.c:dpt_get_conf().
- Add some useful error messages to dpt_scsi.c:dpt_init().

Change #ifdef KERNEL to #ifdef _KERNEL in the public headers. "KERNEL"
is an application space macro and the applications are supposed to be free
to use it as they please (but cannot). This is consistant with the other
BSD's who made this change quite some time ago. More commits to come.

- Implement a simple PIO driven function for retreiving the onboard
configuration information from a DPT card at a given port.

This is needed by the ISA bus front end (still to come) and the EISA
bus front end (which hasn't ever worked).

- Blow away dpt_eisa.h as the information it contains does not justify
an additional file.

- Convert dpt_eisa.c to use the onboard config instead of trying to
read the EISA configuration registers.

$Id$ -> $FreeBSD$

Convert DEVFS hooks in (most) drivers to make_dev().

Diskslice/label code not yet handled.

Vinum, i4b, alpha, pc98 not dealt with (left to respective Maintainers)

Add the correct hook for devfs to kern_conf.c

The net result of this excercise is that a lot less files depends on DEVFS,
and devtoname() gets more sensible output in many cases.

A few drivers had minor additional cleanups performed relating to cdevsw
registration.

A few drivers don't register a cdevsw{} anymore, but only use make_dev().

dpt.h:
Bump the lun field in the eata ccb to 5 bits. We still only
use 3 of them, but we may use the rest at a later date.

dpt_scsi.c:
Default to only 32 S/G segments.

Bzero our CCB array after allocation.

Drop the maximum SG count to 32 from 1024. We can't make use of all of
those extra ones yet, anyway.

In dpttimeout, expect that the controller will complete aborted CCBs through
the interrupt handler. This corrects a panic that was caused by completing
the same transaction twice during timeout recovery.

Honor the tag times types expressed by the user and pass them down to
the controller.

Conver the DPT driver to CAM. The dpt_control interface is not yet
functional, but will be in another day or so.