drm: enable amdgpu module build; update radeon to use updated ttm api

drm/amdgpu: Port to DragonFly

* This commit does not build as it requires ttm changes from
the corresponding commit

Amdgpu driver changes:
* Builds with CONFIG_DRM_AMD_DC and CONFIG_DRM_AMD_DC_DC

drm/amdgpu: Port to DragonFly

* This commit does not build as it requires ttm changes from
the corresponding commit

Amdgpu driver changes:
* Builds with CONFIG_DRM_AMD_DC and CONFIG_DRM_AMD_DC_DCN1_0 defined
* Support for older GPUs (SI, CIK) is not implemented
* Several functions for display core module require msse and
mhard-float gcc flags to be set; and they require special
treatment from kernel by utilizing kernel_fpu_begin/kernel_fpu_end
functions
* It is required that tunable set amdgpu_hw_i2c=1 to work around
panic during module load
* Thunderbolt support is disabled
* Amdgpu trace infrastructure replaced by a stub

Drm changes:
* register_framebuffer is called at the later stage, after crtcs
were properly initialized
* drm_close implemented
* drm_connector_update_edid_property implemented
* Fix drm device stays locked in case of an error or module shutdown
* Imported drm gem framebuffer helper functions
* Fixed null pointer deref in the drm mmap ioctl
* Imported atomic64_inc and atomic_long_* functions from Linux
* Imported bitmap_complement function from Linux
* Imported kfifo struct from Linux
* Implemented dma fence array properly
* Imported rb_root_cached struct from Linux
* Implemented several dma fence functions

Co-authored-by: François Tigeot <ftigeot@wolfpond.org>
Co-authored-by: Matthew Dillon <dillon@apollo.backplane.com>

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vm: Change 'kernel_map' global to type of 'struct vm_map *'

Change the global variable 'kernel_map' from type 'struct vm_map' to a
pointer to this struct. This simplify the code a bit since all
inv

vm: Change 'kernel_map' global to type of 'struct vm_map *'

Change the global variable 'kernel_map' from type 'struct vm_map' to a
pointer to this struct. This simplify the code a bit since all
invocations take its address. This change also aligns with NetBSD's
'kernal_map' that it's also a pointer, which also helps the porting of
NVMM.

No functional changes.

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drm: Add headers and infrastructure required by Linux 4.13+ code

drm: Protect vmmap_list with lockmgr locks

Suggested-by: dillon

drm/linux: Add vmalloc() and vzalloc()

Don't include "internal" headers outside of regular headers.

Include files like <sys/_timespec.h> and so on contain small parts
such as struct timespec that are supposed to be provided by multiple
r

Don't include "internal" headers outside of regular headers.

Include files like <sys/_timespec.h> and so on contain small parts
such as struct timespec that are supposed to be provided by multiple
regular headers. They should only be included by other headers, not
by *.c files.

None of these was actually needed except for the libtelnet one
(replaced with <stddef.h>).

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Revert "drm/linux: Fix vmap()"

This reverts commit c9f83a72b5c7c2f29b40b404aa63767b20a7422c.

It introduced instability on Broadwell platforms.

Reported-by: Daniel Bilik

drm/linux: Fix vmap()

Page protection information was not being used.

drm/linux: use pgprot_t

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one withou

drm: Define struct page and use it everywhere

* Removing countless differences with Linux

* struct page is essentially struct vm_page named differently.
Both can be casted to the other one without further thought.

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drm/linux: Add vmalloc_user() and vfree()

drm/linux: Improve vmap/vunmap API, add is_vmalloc_addr()

* vmap() and vunmap() only take a single argument