vpr: added connection_box_map routing algorithm.

Signed-off-by: Keith Rothman <[email protected]>

vpr: using namespace for connection_box_lookahead map

This is to avoid conflicts in the linker.

Signed-off-by: Alessandro Comodi <[email protected]>

Author: litghost

vpr/src/base/echo_files.cpp

@@ -112,6 +112,8 @@ void alloc_and_load_echo_file_info() {
     setEchoFileName(E_ECHO_CHAN_DETAILS, "chan_details.txt");
     setEchoFileName(E_ECHO_SBLOCK_PATTERN, "sblock_pattern.txt");
     setEchoFileName(E_ECHO_ENDPOINT_TIMING, "endpoint_timing.echo.json");
+
+    setEchoFileName(E_ECHO_LOOKAHEAD_MAP, "lookahead_map.echo");
 }
 
 void free_echo_file_info() {

vpr/src/base/echo_files.h

@@ -43,6 +43,7 @@ enum e_echo_files {
     E_ECHO_CHAN_DETAILS,
     E_ECHO_SBLOCK_PATTERN,
     E_ECHO_ENDPOINT_TIMING,
+    E_ECHO_LOOKAHEAD_MAP,
 
     //Timing Graphs
     E_ECHO_PRE_PACKING_TIMING_GRAPH,

vpr/src/base/read_options.cpp

@@ -648,6 +648,8 @@ struct ParseRouterLookahead {
             conv_value.set_value(e_router_lookahead::CLASSIC);
         else if (str == "map")
             conv_value.set_value(e_router_lookahead::MAP);
+        else if (str == "connection_box_map")
+            conv_value.set_value(e_router_lookahead::CONNECTION_BOX_MAP);
         else {
             std::stringstream msg;
             msg << "Invalid conversion from '"
@@ -661,17 +663,22 @@ struct ParseRouterLookahead {
 
     ConvertedValue<std::string> to_str(e_router_lookahead val) {
         ConvertedValue<std::string> conv_value;
-        if (val == e_router_lookahead::CLASSIC)
+        if (val == e_router_lookahead::CLASSIC) {
             conv_value.set_value("classic");
-        else {
-            VTR_ASSERT(val == e_router_lookahead::MAP);
+        } else if (val == e_router_lookahead::MAP) {
             conv_value.set_value("map");
+        } else if (val == e_router_lookahead::CONNECTION_BOX_MAP) {
+            conv_value.set_value("connection_box_map");
+        } else {
+            std::stringstream msg;
+            msg << "Unrecognized e_router_lookahead";
+            conv_value.set_error(msg.str());
         }
         return conv_value;
     }
 
     std::vector<std::string> default_choices() {
-        return {"classic", "map"};
+        return {"classic", "map", "connection_box_map"};
     }
 };
 

vpr/src/base/vpr_context.h

@@ -20,6 +20,7 @@
 #include "clock_connection_builders.h"
 #include "route_traceback.h"
 #include "place_macro.h"
+#include "connection_box.h"
 
 //A Context is collection of state relating to a particular part of VPR
 //
@@ -194,6 +195,8 @@ struct DeviceContext : public Context {
      * Clock Network
      ********************************************************************/
     t_clock_arch* clock_arch;
+
+    ConnectionBoxes connection_boxes;
 };
 
 //State relating to power analysis

vpr/src/base/vpr_types.h

@@ -103,7 +103,10 @@ constexpr const char* EMPTY_BLOCK_NAME = "EMPTY";
 enum class e_router_lookahead {
     CLASSIC, //VPR's classic lookahead (assumes uniform wire types)
     MAP,     //Lookahead considering different wire types (see Oleg Petelin's MASc Thesis)
-    NO_OP    //A no-operation lookahead which always returns zero
+    NO_OP,   //A no-operation lookahead which always returns zero
+    CONNECTION_BOX_MAP,
+    // Lookahead considering different wire types and IPIN
+    // connection box.
 };
 
 enum class e_route_bb_update {

vpr/src/place/timing_place_lookup.cpp

@@ -264,9 +264,11 @@ static float route_connection_delay(int source_x, int source_y, int sink_x, int
 
             VTR_ASSERT(sink_rr_node != OPEN);
 
-            successfully_routed = calculate_delay(source_rr_node, sink_rr_node,
-                                                  router_opts,
-                                                  &net_delay_value);
+            {
+                successfully_routed = calculate_delay(source_rr_node, sink_rr_node,
+                                                      router_opts,
+                                                      &net_delay_value);
+            }
 
             if (successfully_routed) break;
         }

vpr/src/route/connection_box.cpp

@@ -0,0 +1,127 @@
+#include "connection_box.h"
+#include "vtr_assert.h"
+#include "globals.h"
+
+ConnectionBoxes::ConnectionBoxes()
+    : size_(std::make_pair(0, 0)) {
+}
+
+size_t ConnectionBoxes::num_connection_box_types() const {
+    return boxes_.size();
+}
+
+std::pair<size_t, size_t> ConnectionBoxes::connection_box_grid_size() const {
+    return size_;
+}
+
+const ConnectionBox* ConnectionBoxes::get_connection_box(ConnectionBoxId box) const {
+    if (bool(box)) {
+        return nullptr;
+    }
+
+    size_t index = size_t(box);
+    if (index >= boxes_.size()) {
+        return nullptr;
+    }
+
+    return &boxes_.at(index);
+}
+
+bool ConnectionBoxes::find_connection_box(int inode,
+                                          ConnectionBoxId* box_id,
+                                          std::pair<size_t, size_t>* box_location) const {
+    VTR_ASSERT(box_id != nullptr);
+    VTR_ASSERT(box_location != nullptr);
+
+    const auto& conn_box_loc = ipin_map_[inode];
+    if (conn_box_loc.box_id == ConnectionBoxId::INVALID()) {
+        return false;
+    }
+
+    *box_id = conn_box_loc.box_id;
+    *box_location = conn_box_loc.box_location;
+    return true;
+}
+
+// Clear IPIN map and set connection box grid size and box ids.
+void ConnectionBoxes::reset_boxes(std::pair<size_t, size_t> size,
+                                  const std::vector<ConnectionBox> boxes) {
+    clear();
+
+    size_ = size;
+    boxes_ = boxes;
+}
+
+void ConnectionBoxes::resize_nodes(size_t rr_node_size) {
+    ipin_map_.resize(rr_node_size);
+    canonical_loc_map_.resize(rr_node_size,
+                              std::make_pair(-1, -1));
+}
+
+void ConnectionBoxes::clear() {
+    ipin_map_.clear();
+    size_ = std::make_pair(0, 0);
+    boxes_.clear();
+    canonical_loc_map_.clear();
+    sink_to_ipin_.clear();
+}
+
+void ConnectionBoxes::add_connection_box(int inode, ConnectionBoxId box_id, std::pair<size_t, size_t> box_location) {
+    // Ensure that box location is in bounds
+    VTR_ASSERT(box_location.first < size_.first);
+    VTR_ASSERT(box_location.second < size_.second);
+
+    // Bounds check box_id
+    VTR_ASSERT(bool(box_id));
+    VTR_ASSERT(size_t(box_id) < boxes_.size());
+
+    // Make sure sink map will not be invalidated upon insertion.
+    VTR_ASSERT(sink_to_ipin_.size() == 0);
+
+    ipin_map_[inode] = ConnBoxLoc(box_location, box_id);
+}
+
+void ConnectionBoxes::add_canonical_loc(int inode, std::pair<size_t, size_t> loc) {
+    VTR_ASSERT(loc.first < size_.first);
+    VTR_ASSERT(loc.second < size_.second);
+    canonical_loc_map_[inode] = loc;
+}
+
+const std::pair<size_t, size_t>* ConnectionBoxes::find_canonical_loc(int inode) const {
+    const auto& canon_loc = canonical_loc_map_[inode];
+    if (canon_loc.first == size_t(-1)) {
+        return nullptr;
+    }
+
+    return &canon_loc;
+}
+
+void ConnectionBoxes::create_sink_back_ref() {
+    const auto& device_ctx = g_vpr_ctx.device();
+
+    sink_to_ipin_.resize(device_ctx.rr_nodes.size(), {{0, 0, 0, 0}, 0});
+
+    for (size_t i = 0; i < device_ctx.rr_nodes.size(); ++i) {
+        const auto& ipin_node = device_ctx.rr_nodes[i];
+        if (ipin_node.type() != IPIN) {
+            continue;
+        }
+
+        if (ipin_map_[i].box_id == ConnectionBoxId::INVALID()) {
+            continue;
+        }
+
+        for (auto edge : ipin_node.edges()) {
+            int sink_inode = ipin_node.edge_sink_node(edge);
+            VTR_ASSERT(device_ctx.rr_nodes[sink_inode].type() == SINK);
+            VTR_ASSERT(sink_to_ipin_[sink_inode].ipin_count < 4);
+            auto& sink_to_ipin = sink_to_ipin_[sink_inode];
+            sink_to_ipin.ipin_nodes[sink_to_ipin.ipin_count++] = i;
+        }
+    }
+}
+
+const SinkToIpin& ConnectionBoxes::find_sink_connection_boxes(
+    int inode) const {
+    return sink_to_ipin_[inode];
+}

vpr/src/route/connection_box.h

@@ -0,0 +1,76 @@
+#ifndef CONNECTION_BOX_H
+#define CONNECTION_BOX_H
+// Some routing graphs have connectivity driven by types of connection boxes.
+// This class relates IPIN rr nodes with connection box type and locations, used
+// for connection box driven map lookahead.
+
+#include <tuple>
+#include "vtr_strong_id.h"
+#include "vtr_flat_map.h"
+#include "vtr_range.h"
+#include <map>
+
+struct connection_box_tag {};
+typedef vtr::StrongId<connection_box_tag> ConnectionBoxId;
+
+struct ConnectionBox {
+    std::string name;
+};
+
+struct ConnBoxLoc {
+    ConnBoxLoc()
+        : box_location(std::make_pair(-1, -1)) {}
+    ConnBoxLoc(
+        const std::pair<size_t, size_t>& a_box_location,
+        ConnectionBoxId a_box_id)
+        : box_location(a_box_location)
+        , box_id(a_box_id) {}
+
+    std::pair<size_t, size_t> box_location;
+    ConnectionBoxId box_id;
+};
+
+struct SinkToIpin {
+    int ipin_nodes[4];
+    int ipin_count;
+};
+
+class ConnectionBoxes {
+  public:
+    ConnectionBoxes();
+
+    size_t num_connection_box_types() const;
+    std::pair<size_t, size_t> connection_box_grid_size() const;
+    const ConnectionBox* get_connection_box(ConnectionBoxId box) const;
+
+    bool find_connection_box(int inode,
+                             ConnectionBoxId* box_id,
+                             std::pair<size_t, size_t>* box_location) const;
+    const std::pair<size_t, size_t>* find_canonical_loc(int inode) const;
+
+    // Clear IPIN map and set connection box grid size and box ids.
+    void clear();
+    void reset_boxes(std::pair<size_t, size_t> size,
+                     const std::vector<ConnectionBox> boxes);
+    void resize_nodes(size_t rr_node_size);
+
+    void add_connection_box(int inode, ConnectionBoxId box_id, std::pair<size_t, size_t> box_location);
+    void add_canonical_loc(int inode, std::pair<size_t, size_t> loc);
+
+    // Create map from SINK's back to IPIN's
+    //
+    // This must be called after all connection boxes have been added.
+    void create_sink_back_ref();
+    const SinkToIpin& find_sink_connection_boxes(
+        int inode) const;
+
+  private:
+    std::pair<size_t, size_t> size_;
+    std::vector<ConnectionBox> boxes_;
+    std::vector<ConnBoxLoc> ipin_map_;
+    std::vector<SinkToIpin> sink_to_ipin_;
+    std::vector<std::pair<size_t, size_t>>
+        canonical_loc_map_;
+};
+
+#endif