drm/amdgpu: improve debug VRAM access performance using sdma

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For better performance during VRAM access for debugged processes, do
read/write copies over SDMA.

In order to fulfill post mortem debugging on a broken device, fallback to
stable MMIO access when gpu recovery is disabled or when job submission
time outs are set to max.  Failed SDMA access should automatically fall
back to MMIO access.

Use a pre-allocated GTT bounce buffer pre-mapped into GART to avoid
page-table updates and TLB flushes on access.

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Felix Kuehling <felix.kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Jonathan Kim 2021-12-09 16:48:56 -05:00 • committed by Alex Deucher

parent 7389a5b837

commit cb5cc4f573

2 changed files with 82 additions and 0 deletions

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78

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

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4

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

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