Hardware Topology Functions

Hardware Topology Functions#

AMD SMI: Hardware Topology Functions

Functions
amdsmi_status_t	amdsmi_topo_get_numa_node_number (amdsmi_processor_handle processor_handle, uint32_t *numa_node)
	Retrieve the NUMA CPU node number for a device. More...

amdsmi_status_t	amdsmi_topo_get_link_weight (amdsmi_processor_handle processor_handle_src, amdsmi_processor_handle processor_handle_dst, uint64_t *weight)
	Retrieve the weight for a connection between 2 GPUs. More...

amdsmi_status_t	amdsmi_get_minmax_bandwith_between_processors (amdsmi_processor_handle processor_handle_src, amdsmi_processor_handle processor_handle_dst, uint64_t min_bandwidth, uint64_t max_bandwidth)
	Retreive minimal and maximal io link bandwidth between 2 GPUs. More...

amdsmi_status_t	amdsmi_topo_get_link_type (amdsmi_processor_handle processor_handle_src, amdsmi_processor_handle processor_handle_dst, uint64_t hops, AMDSMI_IO_LINK_TYPE type)
	Retrieve the hops and the connection type between 2 GPUs. More...

amdsmi_status_t	amdsmi_is_P2P_accessible (amdsmi_processor_handle processor_handle_src, amdsmi_processor_handle processor_handle_dst, bool *accessible)
	Return P2P availability status between 2 GPUs. More...

Detailed Description

These functions are used to query Hardware topology.

Function Documentation

◆ amdsmi_topo_get_numa_node_number()

amdsmi_status_t amdsmi_topo_get_numa_node_number	(	amdsmi_processor_handle	processor_handle,
		uint32_t *	numa_node
	)

Retrieve the NUMA CPU node number for a device.

Given a processor handle processor_handle, and a pointer to an uint32_t numa_node, this function will write the node number of NUMA CPU for the device processor_handle to the memory pointed to by numa_node.

Parameters

[in]	processor_handle	a processor handle
[in,out]	numa_node	A pointer to an uint32_t to which the numa node number should be written.

Returns: amdsmi_status_t | AMDSMI_STATUS_SUCCESS on success, non-zero on fail

◆ amdsmi_topo_get_link_weight()

amdsmi_status_t amdsmi_topo_get_link_weight	(	amdsmi_processor_handle	processor_handle_src,
		amdsmi_processor_handle	processor_handle_dst,
		uint64_t *	weight
	)

Retrieve the weight for a connection between 2 GPUs.

Given a source processor handle processor_handle_src and a destination processor handle processor_handle_dst, and a pointer to an uint64_t weight, this function will write the weight for the connection between the device processor_handle_src and processor_handle_dst to the memory pointed to by weight.

Parameters

[in]	processor_handle_src	the source processor handle
[in]	processor_handle_dst	the destination processor handle
[in,out]	weight	A pointer to an uint64_t to which the weight for the connection should be written.

Returns: amdsmi_status_t | AMDSMI_STATUS_SUCCESS on success, non-zero on fail

◆ amdsmi_get_minmax_bandwith_between_processors()

amdsmi_status_t amdsmi_get_minmax_bandwith_between_processors	(	amdsmi_processor_handle	processor_handle_src,
		amdsmi_processor_handle	processor_handle_dst,
		uint64_t *	min_bandwidth,
		uint64_t *	max_bandwidth
	)

Retreive minimal and maximal io link bandwidth between 2 GPUs.

Given a source processor handle processor_handle_src and a destination processor handle processor_handle_dst, pointer to an uint64_t min_bandwidth, and a pointer to uint64_t max_bandiwidth, this function will write theoretical minimal and maximal bandwidth limits. API works if src and dst are connected via xgmi and have 1 hop distance.

Parameters

[in]	processor_handle_src	the source processor handle
[in]	processor_handle_dst	the destination processor handle
[in,out]	min_bandwidth	A pointer to an uint64_t to which the minimal bandwidth for the connection should be written.
[in,out]	max_bandwidth	A pointer to an uint64_t to which the maximal bandwidth for the connection should be written.

Returns: amdsmi_status_t | AMDSMI_STATUS_SUCCESS on success, non-zero on fail

◆ amdsmi_topo_get_link_type()

amdsmi_status_t amdsmi_topo_get_link_type	(	amdsmi_processor_handle	processor_handle_src,
		amdsmi_processor_handle	processor_handle_dst,
		uint64_t *	hops,
		AMDSMI_IO_LINK_TYPE *	type
	)

Retrieve the hops and the connection type between 2 GPUs.

Given a source processor handle processor_handle_src and a destination processor handle processor_handle_dst, and a pointer to an uint64_t hops and a pointer to an AMDSMI_IO_LINK_TYPE type, this function will write the number of hops and the connection type between the device processor_handle_src and processor_handle_dst to the memory pointed to by hops and type.

Parameters

[in]	processor_handle_src	the source processor handle
[in]	processor_handle_dst	the destination processor handle
[in,out]	hops	A pointer to an uint64_t to which the hops for the connection should be written.
[in,out]	type	A pointer to an AMDSMI_IO_LINK_TYPE to which the type for the connection should be written.

Returns: amdsmi_status_t | AMDSMI_STATUS_SUCCESS on success, non-zero on fail

◆ amdsmi_is_P2P_accessible()

amdsmi_status_t amdsmi_is_P2P_accessible	(	amdsmi_processor_handle	processor_handle_src,
		amdsmi_processor_handle	processor_handle_dst,
		bool *	accessible
	)

Return P2P availability status between 2 GPUs.

Given a source processor handle processor_handle_src and a destination processor handle processor_handle_dst, and a pointer to a bool accessible, this function will write the P2P connection status between the device processor_handle_src and processor_handle_dst to the memory pointed to by accessible.

Parameters

[in]	processor_handle_src	the source processor handle
[in]	processor_handle_dst	the destination processor handle
[in,out]	accessible	A pointer to a bool to which the status for the P2P connection availablity should be written.

Returns: amdsmi_status_t | AMDSMI_STATUS_SUCCESS on success, non-zero on fail