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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drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Li

drm: Update to Linux 4.15.18

* Create /dev/dri/renderD* devices
Generally handle /dev entries creation as close to Linux as possible.

* Add drm master support
Sync authentification code with Linux 4.15.18

* handle vm_mm->mmap_sem in ttm page fault operations

* Update dma-fence code from OpenBSD

* This commit contains sleep/wakeup and other changes
from Matthew Dillon <dillon@apollo.backplane.com>

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kernel - Change pager interface to pass page index 2/2

* Adjust the DRM calls to vm_pager_get_page() to pass the
page index.

* Greatly simplify drm/linux_shmem.c and drm/ttm/ttm_bo_vm.c,
removi

kernel - Change pager interface to pass page index 2/2

* Adjust the DRM calls to vm_pager_get_page() to pass the
page index.

* Greatly simplify drm/linux_shmem.c and drm/ttm/ttm_bo_vm.c,
removing the need to deal with placemarker pages for
VM faults on OBJT_MGTDEVICE objects.

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drm: Fix a locking issue in shmem_read_mapping_page()

Reported-by: tuxillo

drm: Update to Linux 4.12.14

* Initial Geminilake support

* Support improvements and model-specific bug fixes for Broxton, Haswell,
Broadwell, Skylake and Kabylake hardware

* Various generic i91

drm: Update to Linux 4.12.14

* Initial Geminilake support

* Support improvements and model-specific bug fixes for Broxton, Haswell,
Broadwell, Skylake and Kabylake hardware

* Various generic i915 bug fixes, including page flipping and memory
corruption issues

* Minor radeon bug fixes

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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: Add linux/shmem_fs.h

shmem_read_mapping_page() is part of the public Linux API. Make it
accessible from linux/shmem_fs.h