drm: Replace all Linux spinlocks by lockmgr locks

* The DragonFly kernel can sleep in different circumstances than Linux

* Linux driver code has not been written to prevent it

* Make all Linux spi

drm: Replace all Linux spinlocks by lockmgr locks

* The DragonFly kernel can sleep in different circumstances than Linux

* Linux driver code has not been written to prevent it

* Make all Linux spinlock_t spinlocks lockmgr locks and avoid potential
problems once and for all

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drm: Fully rework the ww_mutex implementation

Fixing various bugs and inaccurate assertions

drm/linux: Fix potential ww mutex induced panics

ww mutex locking functions can be called with a NULL ctx and were
happily setting both lock->acquired to non-zero and lock->ctx to
NULL, a combinatio

drm/linux: Fix potential ww mutex induced panics

ww mutex locking functions can be called with a NULL ctx and were
happily setting both lock->acquired to non-zero and lock->ctx to
NULL, a combination which other parts of our ww mutex implementation
assume is not possible.

Obtained-from: OpenBSD

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drm: Sync include directives with Linux

* Add a few key include/asm or include/linux headers

* Move some code from .h to .c files in order to avoid clashes
between the DragonFly and Linux variant

drm: Sync include directives with Linux

* Add a few key include/asm or include/linux headers

* Move some code from .h to .c files in order to avoid clashes
between the DragonFly and Linux variants of kmalloc() and kfree()

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<sys/types.h>: Add definitions of bool, true and false for the kernel.

Remove some local definitions in drivers and also switch boolean_t
over to _Bool (if available).

This is similar to how FreeBS

<sys/types.h>: Add definitions of bool, true and false for the kernel.

Remove some local definitions in drivers and also switch boolean_t
over to _Bool (if available).

This is similar to how FreeBSD does it.

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linux/ww_mutex.h: Remove a wrong assert

It constantly causes panics with newer drm code from Linux 4.0.

drm/i915: Update to Linux 3.16

* Much improved support for Broadwell GPUs. Acceleration should now be fully
operational and the giant L4 eDRAM cache is now enabled when present.

* Baytrail/Valley

drm/i915: Update to Linux 3.16

* Much improved support for Broadwell GPUs. Acceleration should now be fully
operational and the giant L4 eDRAM cache is now enabled when present.

* Baytrail/Valleyview support improvements

* prelimary support for Cherryview (14nm Atom SOCs)

* Various fixes and performance improvements on most other GPU generations

* Improved runtime power management

* 5.4GHz DisplayPort support

* Large cursor support (up to 256x256 pixels), useful for high-dpi displays.

* Mapping of user pages into video memory (userptr)
This allows zero-copy downloads and efficient readback to/from the GPU,
allowing faster rendering of client-side software rasterisers, mitigation
of stalls due to read back and faster pipelining of texture data (such as
pixel buffer objects in GL or data blobs in CL). Mixed CPU/GPU operations
become more efficient in general.

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kernel: Use <sys/stdbool.h> in kernel code, not <stdbool.h>.

drm: Basic implementation of wound/wait mutexes used by ttm