drm/amdkfd: AIP mGPUs best prefetch location for xnack on

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For xnack on, if range ACCESS or ACCESS_IN_PLACE (AIP) by single GPU, or
range is ACCESS_IN_PLACE by mGPUs and all mGPUs connection on XGMI same
hive, the best prefetch location is prefetch_loc GPU. Otherwise, the best
prefetch location is always CPU because GPU does not have coherent
mapping VRAM of other GPUs even with large-BAR PCIe connection.

Signed-off-by: Philip Yang <Philip.Yang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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Philip Yang 2021-07-31 21:28:24 -04:00 • committed by Alex Deucher

parent f5bd523988

commit eff8cbf096

1 changed files with 19 additions and 16 deletions

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drivers/gpu/drm/amd/amdkfd/kfd_svm.c

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