fix(tt_um_kmakise_sram): workaround for SRAM macro DRC errors

.github/workflows/gds.yaml

@@ -88,6 +88,10 @@ jobs:
             python ../sky130_density_fix/replace_decap.py --design $project --user-gds $project/$project.gds --replacement-gds ../sky130_density_fix/sky130_ef_sc_hd__newfill_12.gds
           done
 
+      # Workaround for DRC errors in the SRAM macro of tt_um_kmakise_sram:
+      - name: Patch tt_um_kmakise_sram for SRAM DRC errors
+        run: python sky130_sram_workaround/extract_sram_macro.py -n tt_um_kmakise_sram -p projects/tt_um_kmakise_sram/tt_um_kmakise_sram.gds -m myconfig_sky_dual -x projects/tt_um_kmakise_sram/myconfig_sky_dual.gds
+
       # run OpenLane to build the GDS
       - name: Harden Chip ROM
         run: nix-shell $GITHUB_WORKSPACE/openlane2/shell.nix --run "python -m openlane tt/rom/config.json"
@@ -107,6 +111,13 @@ jobs:
         working-directory: tt-multiplexer/ol2/tt_top
         run: nix-shell $GITHUB_WORKSPACE/openlane2/shell.nix --run "python build.py --skip-xor-checks"
 
+      - name: Copy sram macro back into tt_um_kmakise_sram
+        run: |
+          # Find the latest run directory:
+          RUN_DIR=$(ls -d tt-multiplexer/ol2/tt_top/runs/RUN_* | sort -n | tail -n 1)
+          cp $RUN_DIR/final/gds/openframe_project_wrapper.gds $RUN_DIR/final/gds/openframe_project_wrapper.orig.gds
+          python sky130_sram_workaround/inject_sram_macro.py -i $RUN_DIR/final/gds/openframe_project_wrapper.gds -o $RUN_DIR/final/gds/openframe_project_wrapper.gds -p tt_um_kmakise_sram -m myconfig_sky_dual --inject-gds projects/tt_um_kmakise_sram/myconfig_sky_dual.gds
+
       - name: Copy final results
         run: python ./tt/configure.py --copy-final-results
 

sky130_sram_workaround/extract_sram_macro.py

@@ -0,0 +1,51 @@
+# SPDX-License-Identifier: Apache-2.0
+# Authors: Uri Shaked
+
+import klayout.db as pya
+import argparse
+
+parser = argparse.ArgumentParser(
+    description="Extracts a given macro from a user project into a separate file, removing the original macro content from the user's project."
+)
+
+parser.add_argument("--design-name", "-n", required=True)
+parser.add_argument("--project-gds", "-p", required=True)
+parser.add_argument("--macro-name", "-m", required=True)
+parser.add_argument("--extracted-gds", "-x", required=True)
+
+
+args = parser.parse_args()
+
+design_name = args.design_name
+project_gds = args.project_gds
+macro_name = args.macro_name
+extracted_gds = args.extracted_gds
+
+user_layout = pya.Layout()
+user_layout.read(project_gds)
+
+macro_to_extract = user_layout.cell(macro_name)
+if macro_to_extract.is_empty():
+    raise ValueError(f"Cell {macro_name} is empty.")
+
+extracted_layout = pya.Layout()
+extracted_layout.dbu = user_layout.dbu
+extracted_cell = extracted_layout.create_cell(macro_to_extract)
+extracted_cell.name = macro_name
+extracted_cell.copy_tree(macro_to_extract)
+
+macro_to_extract.clear()
+# Create a single shape in the original cell to avoid opelane error about empty cells during the Stream Out (KLayout) step.
+macro_to_extract.shapes(0).insert(pya.Box(0, 0, 0, 0))
+
+has_orphan_cells = True
+while has_orphan_cells:
+    has_orphan_cells = False
+    for cell in user_layout.top_cells():
+        if cell.name != design_name:
+            cell.delete()
+            has_orphan_cells = True
+
+print(f"Extracted {macro_name} from {project_gds} to {extracted_gds}.")
+user_layout.write(project_gds)
+extracted_layout.write(extracted_gds)

sky130_sram_workaround/inject_sram_macro.py

@@ -0,0 +1,43 @@
+# SPDX-License-Identifier: Apache-2.0
+# Authors: Uri Shaked
+
+import klayout.db as pya
+import argparse
+
+parser = argparse.ArgumentParser(description="Injects the macro into a user's project.")
+
+parser.add_argument("--input-gds", "-i", required=True)
+parser.add_argument("--output-gds", "-o", required=True)
+parser.add_argument("--project-name", "-p", required=True)
+parser.add_argument("--macro-name", "-m", required=True)
+parser.add_argument("--inject-gds", required=True)
+
+args = parser.parse_args()
+
+input_gds = args.input_gds
+output_gds = args.output_gds
+macro_name = args.macro_name
+project_name = args.project_name
+inject_gds = args.inject_gds
+
+tt_layout = pya.Layout()
+tt_layout.read(input_gds)
+
+user_project_cell = tt_layout.cell(project_name)
+prefix = None
+for inst in user_project_cell.each_inst():
+    assert inst
+    prefix = inst.cell.name[:3]
+    assert prefix[2] == "_"
+
+assert prefix
+
+macro_layout = pya.Layout()
+macro_layout.read(inject_gds)
+
+target_cell = tt_layout.cell(prefix + macro_name)
+target_cell.clear()
+target_cell.copy_tree(macro_layout.cell(macro_name))
+
+print(f"Injected {macro_name} and wrote the result into {output_gds}.")
+tt_layout.write(output_gds)