drm/amdgpu: get extended xgmi topology data

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The TA has a limit to the amount of data that can be retrieved from
GET_TOPOLOGY.  For setups that exceed this limit, the xGMI topology
needs to be re-initialized and data needs to be re-fetched from the
extended link records by setting a flag in the shared command buffer.

The number of hops and the number of links must be accumulated by the
driver. Other data points are all fetched from the first request.
Because the TA has already exceeded its link record limit, it
cannot hold bidirectional information.  Otherwise the driver would
have to do more than two fetches so the driver has to reflect the
topology information in the opposite direction.

v2: squashed with internal reviewed fix

Signed-off-by: Jonathan Kim <jonathan.kim@amd.com>
Reviewed-by: Hawking Zhang <hawking.zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

...

This commit is contained in:

Jonathan Kim 2021-08-03 19:01:55 -04:00 • committed by Alex Deucher

parent 3a6e4106a8

commit 44357a1bd5

4 changed files with 145 additions and 14 deletions

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92

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

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6

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

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58

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

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3

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

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