drm/amdgpu: Map all visible VRAM at startup

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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>

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Amber Lin 2018-02-27 10:01:59 -05:00 • committed by Alex Deucher

parent 5d447f09b8

commit f8f4b9a679

2 changed files with 18 additions and 0 deletions

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17

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c

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1

drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.h

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