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drm/amdgpu: Map all visible VRAM at startup
When using CPU to update page table, we need to kmap all the PDs/PTs after
they are allocated and that requires a TLB shot down on each CPU, which is
quite heavy.
Instead, we map the whole visible VRAM to a kernel address at once. Pages
can be obtained from the offset.
v2: move the mapping base from gmc to amdgpu_mman structure, and the
implementation in amdgpu_ttm_* functions
Signed-off-by: Amber Lin <Amber.Lin@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>