drm/amdgpu: Move to gtt before cpu accesses dma buf.

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To improve cpu read performance. This is implemented for APUs currently.

v2: Adapt to change https://lists.freedesktop.org/archives/amd-gfx/2017-October/015174.html
v3: Adapt to change "forward begin_cpu_access callback to drivers"
v4: Instead of v3, reuse drm_gem dmabuf_ops here. Also some minor fixes as suggested.
v5: only set dma_buf ops when it is valid (Samuel)

Signed-off-by: Samuel Li <Samuel.Li@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Samuel Li 2017-12-08 16:18:59 -05:00 • committed by Alex Deucher

parent 6e227308a9

commit 09052fc376

3 changed files with 72 additions and 2 deletions

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2

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

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2

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

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70

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

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