drm: Nix drm_agp_borrow.

This horrible kludge dates from before I understood the relation of
genfb_pci and pci drm drivers in the old and new worlds of drm.

The only user of it, in i915, was change

drm: Nix drm_agp_borrow.

This horrible kludge dates from before I understood the relation of
genfb_pci and pci drm drivers in the old and new worlds of drm.

The only user of it, in i915, was changed to use agp_i810_borrow
directly in the last drm update, so this hack can die.

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Merge linux-drm-v5-6-rc3

Reduce diffs by side-loading some header files like Linux.

From riastradh

Rework PCI and AGP conditionalization.

- Push drm_pci_set_unique into driver callback.
- Eliminate drm_pci_set_unique_hook.
- Gather all drm_agp_* functions into struct drm_agp_hooks.
- Replace the

Rework PCI and AGP conditionalization.

- Push drm_pci_set_unique into driver callback.
- Eliminate drm_pci_set_unique_hook.
- Gather all drm_agp_* functions into struct drm_agp_hooks.
- Replace the nonsensical old atomic garbage by serious locking.
- Make drm_agpsupport.c its own module.
- Eliminate NDRMKMS_PCI.
- Use NAGP from "agp.h" only in drm_module.c for horrible hack.
=> See comment in file for rationale.
- Always define CONFIG_PCI=1 and CONFIG_AGP=1.
- Always go through the drm_agp_* function hooks.
- Ifdef out nouveau agp stuff that doesn't go through drm_agp_*
for reasons that I'm too frustrated to figure out tonight.
- pci_iomap no longer automagically does agp_i810_borrow.
=> Use drm_agp_borrow instead.

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Use AGP_PAGE_SIZE, not PAGE_SIZE.

Terminate ifdef missed in merge.

merge linux-drm-v4-4-143

Move all PCI/AGP code back to drmkms_pci module where it belongs.

make a drm_agp_destroy() function to resolve the circular dependency between
drmkms and drmkms_pci

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK

Make it build and boot on my test machines.

Screen blanks on boot on the Ivy Bridge system with

DRM error in cpt_serr_int_handler: PCH transcoder A FIFO underrun

But after that everything is OK. Appears to be an upstream problem.
To investigate...

I think there's a cache flushing issue somewhere -- there are little
display artefacts on my T60.

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fix merge conflicts

Merge riastradh-drm2 to HEAD.

Import drm sources from Linux v3.8-rc6.
(commit id 88b62b915b0b7e25870eb0604ed9a92ba4bfc9f7)

Linux NetBSD
drivers/gpu/drm sys/external/bsd/drm2/dist/drm
include/drm

Import drm sources from Linux v3.8-rc6.
(commit id 88b62b915b0b7e25870eb0604ed9a92ba4bfc9f7)

Linux NetBSD
drivers/gpu/drm sys/external/bsd/drm2/dist/drm
include/drm sys/external/bsd/drm2/dist/include/drm
include/uapi/drm sys/external/bsd/drm2/dist/uapi/drm

Files/subtrees excluded because of licence issues, to be either
revisited later (particularly nouveau and radeon, which are mostly
permissively licensed but a number of whose files have no licence
statements), rewritten/ignored, or imported later as kernel modules
under external/gpl2 instead:

include/drm/drm_fb_cma_helper.h
include/drm/drm_gem_cma_helper.h
include/drm/drm_os_linux.h
include/drm/drm_pciids.h
include/drm/drm_sysfs.h
include/drm/drm_usb.h
include/drm/exynos_drm.h
include/drm/gma_drm.h
include/drm/intel-gtt.h
drm/cirrus
drm/drm_edid_load.c
drm/drm_fb_cma_helper.c
drm/drm_gem_cma_helper.c
drm/drm_sysfs.c
drm/drm_trace.h
drm/drm_trace_points.c
drm/drm_usb.c
drm/exynos
drm/gma500
drm/i915/i915_trace.h
drm/i915/i915_trace_points.c
drm/i915/intel_acpi.c
drm/mgag200
drm/nouveau
drm/radeon
drm/shmobile
drm/tegra
drm/udl
uapi/exynos_drm.h

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