drm: Make via build again.

Merge linux-drm-v5-6-rc3

DRM_HZ -> HZ, to reduce diffs.

merge linux-drm-v4-4-143

Make viadrm (UMS) almost build.

Missing part: something needs to issue config_found_ia("drmums_pci"),
and config(5) needs to be told that it will do that. The sensible
approach is for vga_pci to do

Make viadrm (UMS) almost build.

Missing part: something needs to issue config_found_ia("drmums_pci"),
and config(5) needs to be told that it will do that. The sensible
approach is for vga_pci to do so. But config(5) doesn't seem to
understand that *only* vga_pci will do that, not all vga.

The old scheme was to tell config(5) that vga would always attach
drm, and actually attach it in vga_pci, and hope that nobody would
ever consider trying to attach non-PCI devices but quietly leave the
token `pci' out of the name of the drm interface attribute so it
didn't look wrong to have it outside dev/pci/files.pci.

Maybe that's still the right thing, as far as anything UMS can be
right.

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New macro DRM_SPIN_WAIT_ON better reflects DRM_WAIT_ON.

We still need to adapt all waits from upstream to use an interlock,
so we can't implement DRM_WAIT_ON verbatim, but this more closely
reflects

New macro DRM_SPIN_WAIT_ON better reflects DRM_WAIT_ON.

We still need to adapt all waits from upstream to use an interlock,
so we can't implement DRM_WAIT_ON verbatim, but this more closely
reflects the API of DRM_WAIT_ON than DRM_*WAIT*_UNTIL do.

Major difference is that this polls every tick, like DRM_WAIT_ON,
unlike DRM_*WAIT*_UNTIL. So it will mask missing wakeups, but it
wouldn't surprise me if there were such things upstream.

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Fix these drm waits too, in case anyone tries to use this via code.

Partial viadrm2 snapshot.

To do:

- autoconf attachment (shouldn't be hard)
- viafb (maybe steal unichromefb and adapt attachment structure)
- actually run it (no hardware here)

Import drm from Linux 3.15 (commitid 1860e379875dfe7271c649058aeddffe5afd9d0d).

drivers/gpu/drm -> sys/external/bsd/drm2/dist/drm
include/drm -> sys/external/bsd/drm2/dist/includ

Import drm from Linux 3.15 (commitid 1860e379875dfe7271c649058aeddffe5afd9d0d).

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

GPL sources excluded.

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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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