from __future__ import annotations import heapq from collections import defaultdict from kernbench.policy.address.phyaddr import PhysAddr, UnitType from kernbench.topology.types import TopologyGraph class RoutingError(Exception): pass class AddressResolver: """Resolve a PhysAddr to the destination node_id in the compiled graph. Also provides named node lookups (find_m_cpu, find_pcie_ep, …) so that component implementations never construct node_id strings directly. Centralising the naming convention here means a single change propagates everywhere (ADR-0015 D4). """ def __init__(self, graph: TopologyGraph) -> None: self._node_ids = set(graph.nodes) mm = graph.spec["cube"]["memory_map"] self._slice_size_bytes = mm["hbm_total_gb_per_cube"] * (1 << 30) // mm["hbm_slices_per_cube"] # ── Physical-address resolution ────────────────────────────────── def resolve(self, addr: PhysAddr) -> str: s = addr.sip_id c = addr.cube_id if addr.kind == "hbm": pe_slice = PhysAddr.hbm_pe_id(addr.hbm_offset, self._slice_size_bytes) node_id = f"sip{s}.cube{c}.hbm_ctrl.slice{pe_slice}" elif addr.kind == "pe_resource": if addr.unit_type == UnitType.PE: node_id = f"sip{s}.cube{c}.pe{addr.pe_id}.pe_tcm" elif addr.unit_type == UnitType.SRAM: node_id = f"sip{s}.cube{c}.sram" elif addr.unit_type == UnitType.MCPU: node_id = f"sip{s}.cube{c}.m_cpu" else: raise RoutingError(f"unsupported unit_type: {addr.unit_type}") else: raise RoutingError(f"unsupported address kind: {addr.kind}") if node_id not in self._node_ids: raise RoutingError(f"node {node_id} not found in topology") return node_id # ── Named node lookups ─────────────────────────────────────────── def find_m_cpu(self, sip: int, cube: int) -> str: node_id = f"sip{sip}.cube{cube}.m_cpu" if node_id not in self._node_ids: raise RoutingError(f"M_CPU not found: {node_id}") return node_id def find_pcie_ep(self, sip: int, io_id: str = "io0") -> str: node_id = f"sip{sip}.{io_id}.pcie_ep" if node_id not in self._node_ids: raise RoutingError(f"PCIE_EP not found: {node_id}") return node_id def find_io_cpu(self, sip: int, io_id: str = "io0") -> str: node_id = f"sip{sip}.{io_id}.io_cpu" if node_id not in self._node_ids: raise RoutingError(f"IO_CPU not found: {node_id}") return node_id def find_all_pcie_eps(self) -> list[str]: """Return all PCIE_EP node ids across all SIPs, sorted.""" return sorted(nid for nid in self._node_ids if nid.endswith(".pcie_ep")) class PathRouter: """Find data-path from a source PE (or arbitrary node) to a destination node. Two adjacency graphs are maintained: _adj — excludes command edges (used by PE DMA routing, find_path) _adj_all — includes all edges (used by component-to-component routing, find_node_path; required because M_CPU↔NOC links are "command") """ # Edge kinds excluded from M_CPU DMA adjacency: prevents routing through # PE-internal pipeline nodes when computing DMA paths. _MCPU_DMA_EXCLUDE = {"pe_internal", "pe_to_xbar"} def __init__(self, graph: TopologyGraph) -> None: self._adj: dict[str, list[tuple[str, float]]] = defaultdict(list) self._adj_all: dict[str, list[tuple[str, float]]] = defaultdict(list) self._adj_mcpu_dma: dict[str, list[tuple[str, float]]] = defaultdict(list) for e in graph.edges: w = e.routing_weight_mm if e.routing_weight_mm is not None else e.distance_mm self._adj_all[e.src].append((e.dst, w)) if e.kind != "command": self._adj[e.src].append((e.dst, w)) if e.kind not in self._MCPU_DMA_EXCLUDE: self._adj_mcpu_dma[e.src].append((e.dst, w)) def find_path(self, src_pe: str, dst_node: str) -> list[str]: """PE DMA routing: prepends .pe_dma, excludes command edges.""" start = f"{src_pe}.pe_dma" return self._run_dijkstra(self._adj, start, dst_node) def find_path_with_distance(self, src_pe: str, dst_node: str) -> tuple[list[str], float]: start = f"{src_pe}.pe_dma" return self._run_dijkstra_with_dist(self._adj, start, dst_node) def find_mcpu_dma_path(self, m_cpu_id: str, dst_hbm_slice_id: str) -> list[str]: """M_CPU DMA path: never routes through PE-internal nodes (ADR-0015 D5). Same-cube: deterministic [m_cpu, noc, xbar.pe_i, hbm_ctrl.slice_i]. Cross-cube: Dijkstra via _adj_mcpu_dma (pe_internal/pe_to_xbar excluded) → routes through NOC → UCIe → target cube NOC → xbar → HBM. """ m_cube = ".".join(m_cpu_id.split(".")[:2]) d_cube = ".".join(dst_hbm_slice_id.split(".")[:2]) if m_cube == d_cube: slice_idx = int(dst_hbm_slice_id.rsplit("slice", 1)[1]) return [ m_cpu_id, f"{m_cube}.noc", f"{m_cube}.xbar.pe{slice_idx}", dst_hbm_slice_id, ] return self._run_dijkstra(self._adj_mcpu_dma, m_cpu_id, dst_hbm_slice_id) def find_node_path(self, src: str, dst: str) -> list[str]: """General routing between arbitrary nodes, including command edges. Used by components (IoCpuComponent, MCpuComponent) that route through M_CPU↔NOC command-kind links. """ return self._run_dijkstra(self._adj_all, src, dst) def _run_dijkstra( self, adj: dict[str, list[tuple[str, float]]], start: str, goal: str, ) -> list[str]: path, _ = self._run_dijkstra_with_dist(adj, start, goal) return path def _run_dijkstra_with_dist( self, adj: dict[str, list[tuple[str, float]]], start: str, goal: str, ) -> tuple[list[str], float]: if start == goal: return [start], 0.0 best: dict[str, float] = {start: 0.0} prev: dict[str, str] = {} heap: list[tuple[float, str]] = [(0.0, start)] while heap: d, node = heapq.heappop(heap) if node == goal: path: list[str] = [] cur = goal while cur != start: path.append(cur) cur = prev[cur] path.append(start) path.reverse() return path, d if d > best.get(node, float("inf")): continue for neighbor, edge_dist in adj[node]: new_d = d + edge_dist if new_d < best.get(neighbor, float("inf")): best[neighbor] = new_d prev[neighbor] = node heapq.heappush(heap, (new_d, neighbor)) raise RoutingError(f"no path from {start} to {goal}") # ── backward-compat shims (used by existing tests) ─────────────── def _dijkstra(self, start: str, goal: str) -> list[str]: return self._run_dijkstra(self._adj, start, goal) def _dijkstra_with_dist(self, start: str, goal: str) -> tuple[list[str], float]: return self._run_dijkstra_with_dist(self._adj, start, goal)