drm/amdgpu: get extended xgmi topology data

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>

1 files changed, 2 insertions, 1 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/ta_xgmi_if.h b/drivers/gpu/drm/amd/amdgpu/ta_xgmi_if.h
index cce7127afeaa..da815a93d46e 100644
--- a/drivers/gpu/drm/amd/amdgpu/ta_xgmi_if.h
+++ b/drivers/gpu/drm/amd/amdgpu/ta_xgmi_if.h
@@ -134,7 +134,8 @@ struct ta_xgmi_shared_memory {
 	uint32_t			cmd_id;
 	uint32_t			resp_id;
 	enum ta_xgmi_status		xgmi_status;
-	uint32_t			reserved;
+	uint8_t				flag_extend_link_record;
+	uint8_t				reserved0[3];
 	union ta_xgmi_cmd_input		xgmi_in_message;
 	union ta_xgmi_cmd_output	xgmi_out_message;
 };