drm/amdgpu: fix race between pstate and remote buffer map

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Vega20 arbitrates pstate at hive level and not device level. Last peer to
remote buffer unmap could drop P-State while another process is still
remote buffer mapped.

With this fix, P-States still needs to be disabled for now as SMU bug
was discovered on synchronous P2P transfers.  This should be fixed in the
next FW update.

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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This commit is contained in:

Jonathan Kim 2020-03-17 15:43:41 -04:00 • committed by Alex Deucher

parent 9f65693577

commit d84a430d9f

6 changed files with 49 additions and 53 deletions

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2

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

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3

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

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16

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

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4

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

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78

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

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9

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

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