drm/amdgpu: re-apply "move internal vram_mgr function into the C file""

This re-applys commit 708d19d9f362766147cab79eccae60912c6d3068.

The original problem this was reverted for was found and the correct fix
will be merged to drm-misc-next-fixes.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220714132315.587217-2-christian.koenig@amd.com

Revert "drm/amdgpu: move internal vram_mgr function into the C file"

This reverts commit 708d19d9f362766147cab79eccae60912c6d3068.

This is part of a revert of the following commits:
commit 708d19d9f362 ("drm/amdgpu: move internal vram_mgr function into the C file")
commit 5e3f1e7729ec ("drm/amdgpu: fix start calculation in amdgpu_vram_mgr_new")
commit c9cad937c0c5 ("drm/amdgpu: add drm buddy support to amdgpu")

[WHY]
Few users reported garbaged graphics as soon as x starts,
reverting until this can be resolved.

Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220708093047.492662-1-Arunpravin.PaneerSelvam@amd.com

drm/amdgpu: Fix for drm buddy memory corruption

User reported gpu page fault when running graphics applications
and in some cases garbaged graphics are observed as soon as X
starts. This patch fixes all the issues.

Fixed the typecast issue for fpfn and lpfn variables, thus
preventing the overflow problem which resolves the memory
corruption.

Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Reported-by: Mike Lothian <mike@fireburn.co.uk>
Tested-by: Mike Lothian <mike@fireburn.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20220714101214.7620-1-Arunpravin.PaneerSelvam@amd.com
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Christian König <christian.koenig@amd.com>

drm/amdgpu: move internal vram_mgr function into the C file

No need to have those in the header.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Reviewed-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220510113649.879821-2-christian.koenig@amd.com

drm/amdgpu: add drm buddy support to amdgpu

- Switch to drm buddy allocator
- Add resource cursor support for drm buddy

v2(Matthew Auld):
- replace spinlock with mutex as we call kmem_cache_zalloc
(..., GFP_KERNEL) in drm_buddy_alloc() function

- lock drm_buddy_block_trim() function as it calls
mark_free/mark_split are all globally visible

v3(Matthew Auld):
- remove trim method error handling as we address the failure case
at drm_buddy_block_trim() function

v4:
- fix warnings reported by kernel test robot <lkp@intel.com>

v5:
- fix merge conflict issue

v6:
- fix warnings reported by kernel test robot <lkp@intel.com>

v7:
- remove DRM_BUDDY_RANGE_ALLOCATION flag usage

v8:
- keep DRM_BUDDY_RANGE_ALLOCATION flag usage
- resolve conflicts created by drm/amdgpu: remove VRAM accounting v2

v9(Christian):
- merged the below patch
- drm/amdgpu: move vram inline functions into a header
- rename label name as fallback
- move struct amdgpu_vram_mgr to amdgpu_vram_mgr.h
- remove unnecessary flags from struct amdgpu_vram_reservation
- rewrite block NULL check condition
- change else style as per coding standard
- rewrite the node max size
- add a helper function to fetch the first entry from the list

v10(Christian):
- rename amdgpu_get_node() function name as amdgpu_vram_mgr_first_block

v11:
- if size is not aligned with min_page_size, enable is_contiguous flag,
therefore, the size round up to the power of two and trimmed to the
original size.
v12:
- rename the function names having prefix as amdgpu_vram_mgr_*()
- modify the round_up() logic conforming to contiguous flag enablement
or if size is not aligned to min_block_size
- modify the trim logic
- rename node as block wherever applicable

Signed-off-by: Arunpravin Paneer Selvam <Arunpravin.PaneerSelvam@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220407224843.2416-1-Arunpravin.PaneerSelvam@amd.com
Signed-off-by: Christian König <christian.koenig@amd.com>