drm/amdgpu: add psp command to get num xgmi links between direct peers

The TA can now be invoked to provide the number of xgmi links connecting
a direct source and destination peer.
Non-direct peers will report zero links.
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>

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

@@ -1078,6 +1078,12 @@ int psp_xgmi_get_node_id(struct psp_context *psp, uint64_t *node_id)
 	return 0;
 }
 
+static bool psp_xgmi_peer_link_info_supported(struct psp_context *psp)
+{
+	return psp->adev->asic_type == CHIP_ALDEBARAN &&
+				psp->ta_xgmi_ucode_version >= 0x2000000b;
+}
+
 int psp_xgmi_get_topology_info(struct psp_context *psp,
 			       int number_devices,
 			       struct psp_xgmi_topology_info *topology)
@@ -1121,6 +1127,23 @@ int psp_xgmi_get_topology_info(struct psp_context *psp,
 		topology->nodes[i].sdma_engine = topology_info_output->nodes[i].sdma_engine;
 	}
 
+	/* Invoke xgmi ta again to get the link information */
+	if (psp_xgmi_peer_link_info_supported(psp)) {
+		struct ta_xgmi_cmd_get_peer_link_info_output *link_info_output;
+
+		xgmi_cmd->cmd_id = TA_COMMAND_XGMI__GET_PEER_LINKS;
+
+		ret = psp_xgmi_invoke(psp, TA_COMMAND_XGMI__GET_PEER_LINKS);
+
+		if (ret)
+			return ret;
+
+		link_info_output = &xgmi_cmd->xgmi_out_message.get_link_info;
+		for (i = 0; i < topology->num_nodes; i++)
+			topology->nodes[i].num_links =
+					link_info_output->nodes[i].num_links;
+	}
+
 	return 0;
 }
 

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

@@ -116,6 +116,7 @@ struct psp_xgmi_node_info {
 	uint8_t					num_hops;
 	uint8_t					is_sharing_enabled;
 	enum ta_xgmi_assigned_sdma_engine	sdma_engine;
+	uint8_t					num_links;
 };
 
 struct psp_xgmi_topology_info {

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

@@ -33,7 +33,8 @@ enum ta_command_xgmi {
 	TA_COMMAND_XGMI__GET_NODE_ID			= 0x01,
 	TA_COMMAND_XGMI__GET_HIVE_ID			= 0x02,
 	TA_COMMAND_XGMI__GET_GET_TOPOLOGY_INFO		= 0x03,
-	TA_COMMAND_XGMI__SET_TOPOLOGY_INFO		= 0x04
+	TA_COMMAND_XGMI__SET_TOPOLOGY_INFO		= 0x04,
+	TA_COMMAND_XGMI__GET_PEER_LINKS			= 0x0B
 };
 
 /* XGMI related enumerations */
@@ -75,6 +76,11 @@ struct ta_xgmi_node_info {
 	enum ta_xgmi_assigned_sdma_engine	sdma_engine;
 };
 
+struct ta_xgmi_peer_link_info {
+	uint64_t				node_id;
+	uint8_t					num_links;
+};
+
 struct ta_xgmi_cmd_initialize_output {
 	uint32_t	status;
 };
@@ -97,6 +103,11 @@ struct ta_xgmi_cmd_get_topology_info_output {
 	struct ta_xgmi_node_info	nodes[TA_XGMI__MAX_CONNECTED_NODES];
 };
 
+struct ta_xgmi_cmd_get_peer_link_info_output {
+	uint32_t			num_nodes;
+	struct ta_xgmi_peer_link_info	nodes[TA_XGMI__MAX_CONNECTED_NODES];
+};
+
 struct ta_xgmi_cmd_set_topology_info_input {
 	uint32_t			num_nodes;
 	struct ta_xgmi_node_info	nodes[TA_XGMI__MAX_CONNECTED_NODES];
@@ -115,6 +126,7 @@ union ta_xgmi_cmd_output {
 	struct ta_xgmi_cmd_get_node_id_output		get_node_id;
 	struct ta_xgmi_cmd_get_hive_id_output		get_hive_id;
 	struct ta_xgmi_cmd_get_topology_info_output	get_topology_info;
+	struct ta_xgmi_cmd_get_peer_link_info_output	get_link_info;
 };
 /**********************************************************/