- Copy stable/10@296371 to releng/10.3 in preparation for 10.3-RC1
builds.
- Update newvers.sh to reflect RC1.
- Update __FreeBSD_version to reflect 10.3.
- Update default pkg(8) configuration to use the quarterly branch.

Approved by: re (implicit)

MFC r273862,273902:

Port the TTM AGP backend to the FreeBSD agp driver and enable AGP support
in the radeonkms driver.

Note: In PCI mode virtual addresses on the graphics card that map to system
RAM are translated to physical addresses by the graphics card itself. In
AGP mode address translation is done by the AGP chipset so fictitious
addresses appear on the system bus. For the CPU cache management to work
correctly when the CPU accesses this memory it needs to use the same
fictitious addresses (and let the chipset translate them) instead of using
the physical addresses directly.

Reviewed by: kib

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

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

drm/ttm: Import Linux commit cc4c0c4de3c775be22072ec3251f2e581b63d9a0

Author: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Tue Jan 15 14:57:28 2013 +0100

drm/ttm: unexport ttm_bo_wait_unreserved

All legitimate users of this function outside ttm_bo.c are gone, now
it's only an implementation detail.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>

Approved by: kib@

drm/ttm: Import Linux commit 5e45d7dfd74100d622f9cdc70bfd1f9fae1671de

Author: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Tue Jan 15 14:57:05 2013 +0100

drm/ttm: add ttm_bo_reserve_slowpath

Instead of dropping everything, waiting for the bo to be unreserved
and trying over, a better strategy would be to do a blocking wait.

This can be mapped a lot better to a mutex_lock-like call.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>

Approved by: kib@

drm/ttm: Import Linux commit 63d0a4195560362e2e00a3ad38fc331d34e1da9b

Author: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Date: Tue Jan 15 14:56:37 2013 +0100

drm/ttm: remove lru_lock around ttm_bo_reserve

There should no longer be assumptions that reserve will always succeed
with the lru lock held, so we can safely break the whole atomic
reserve/lru thing. As a bonus this fixes most lockdep annotations for
reservations.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@canonical.com>
Reviewed-by: Jerome Glisse <jglisse@redhat.com>

Import the preliminary port of the TTM.

The early commit is done to facilitate the off-tree work on the
porting of the Radeon driver.

Sponsored by: The FreeBSD Foundation
Debugged and tested by: dumbbell
MFC after: 1 month