Copy stable/9 to releng/9.3 as part of the 9.3-RELEASE cycle.

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

Copy head to stable/9 as part of 9.0-RELEASE release cycle.

Approved by: re (implicit)

strict kobj signatures: fixes in agp driver

offset parameter has vm_offset_t type in calling code and in kobj method

Reviewed by: imp, rnoland, lulf, current@
Approved by: jhb (mentor)

Move the agp(4) driver from sys/pci to sys/dev/agp. __FreeBSD_version was
bumped to 800004 to note the change though userland apps should not be
affected since they use <sys/agpio.h> rather than the headers in
sys/dev/agp.

Discussed with: anholt
Repocopy by: simon

Split agp_generic_detach() up into two routines: agp_free_cdev() destroys
/dev/agpgart and agp_free_res() frees resources like the BAR for the
aperture. Splitting this up lets chipset-specific detach routines
manipulate the aperture during their detach routines without panicing.

MFC after: 1 week
Reviewed by: anholt

Change the various AGP drivers that attach to the Host-PCI bridge device to
attach to the hostb driver instead. This means that agp can now be loaded
at runtime (in theory at least). Also, the drivers no longer have to
explicity call device_verbose() to cancel out any earlier calls to
device_quiet() by the hostb(4) driver (this shows a limitation in new-bus,
drivers really shouldn't be doing device_quiet() until they know they are
going to drive that device, i.e. in attach).

Add device id for the Ali M1671 host to AGP bridge.

Return BUS_PROBE_DEFAULT instead of 0.

[1] Remove the generic bridge support from those drivers that had it. The
generic bridge support was biting us more than it helped, whenever a new chipset
came out from a vendor and misprogramming it caused strange hangs or corruption.
[2] Add a large number of PCI IDs based on what the linux drivers support.
Note that the new PCI IDs haven't been tested, they're just *likely* to work.
In particular the VIA AGP 8x chipsets are concerning, due to lack of testing,
possible issues (kern/69953), and not having a nice "does this bridge say it
would do 8x" function. However, this shouldn't make the situation worse, since
these chips would have probed in the past anyway.

Fix aperture size detection on some ALi chipsets by only using the lowest 4 bits
to check aperture size, avoiding hangs. Maintain the rest of the bits when
setting/unsetting ATTBASE. This essentially matches Linux's AGP driver as well.

PR: kern/70037
Submitted by: Mark Tinguely <tinguely at casselton dot net>
Obtained from: NetBSD

Apply some stylistic changes based off of kern/70037 (content changes to
follow).

Add missing <sys/module.h> includes

Get rid of a lockmgr consumer by making agp(4) use a standard mutex,
since it's always acquiring the lock exclusively. This was tested
with X on an SMP box, with and without WITNESS.

Add the ability to disable agp devices at the loader prompt. Usage is
hint.agp.0.disabled="1"

Submitted by: jhb

- Disable AGP on ALI chipsets if aperture size is 0.
- Fail in agp_alloc_gatt if the aperture size is 0 instead of panicing in
contigmalloc.

Reported by: Bjoern Fischer <bfischer@Techfak.Uni-Bielefeld.DE>
Reviewed by: jhb
MFC after: 1 week

Prefer new location of pci include files (which have only been in the
tree for two or more years now), except in a few places where there's
code to be compatible with older versions of FreeBSD.

Use __FBSDID().

- Express hard dependencies on bus (pci, isa, pccard) and
network layer (ether).
- Don't abuse module names to facilitate ifconfig module loading;
such abuse isn't really needed. (And if we do need type information
associated with a module then we should make it explicit and not
use hacks.)

Remove a bunch of #include "opt_pci.h".

Include <sys/lockmgr.h> for old lock interfaces instead of depending on
namespace pollution in <sys/lock.h>.

Make these compile again by adding proc.h include for GIANT_REQUIRED
that is in included vm headers.

Introduce a global lock for the vm subsystem (vm_mtx).

vm_mtx does not recurse and is required for most low level
vm operations.

faults can not be taken without holding Giant.

Memory subsystems can now call the base page allocators safely.

Almost all atomic ops were removed as they are covered under the
vm mutex.

Alpha and ia64 now need to catch up to i386's trap handlers.

FFS and NFS have been tested, other filesystems will need minor
changes (grabbing the vm lock when twiddling page properties).

Reviewed (partially) by: jake, jhb

A driver for programming the AGP hardware. This is only very lightly
tested on Intel BX chipsets only. The other agp minidrivers are totally
untested.

The programming api is a subset of the Linux api and is only intended to
be enough for the X server to use. There is also an in-kernel api for the
use of other kernel modules such as the 3D DRI.