drm/amdgpu: Allocate GART table in RAM for AMD APU

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Some AMD APUs may not have a dedicated VRAM. On such platforms the GART
table should be allocated on the system memory. When real vram size is
zero, place the GART table in system memory and create an SG BO to make
it GPU accessible.

v2: fix includes

Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
(rajneesh: removed set_memory_wc workaround)
Signed-off-by: Rajneesh Bhardwaj <rajneesh.bhardwaj@amd.com>
Signed-off-by: Harish Kasiviswanathan <Harish.Kasiviswanathan@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Felix Kuehling 2022-11-29 12:45:26 -05:00 • committed by Alex Deucher

parent 34fd9d6867

commit c9a502e981

3 changed files with 156 additions and 6 deletions

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137

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

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2

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

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23

drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c

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