intel/perf: Deduplicate perf counters

No changes in resulting code (yes, seriously!). GCC constant propagates
the static const arrays into the code, yielding bit for bit identical
results. This will however enable further cleanups.

Before this patch, we emit 11916 different initializations of
intel_perf_query_counter. With this patch we emit an array of 539 and
initialize the intel_perf_query_counters in terms of those.

Reviewed-by: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
(cherry picked from commit 5e6c7a572e)

Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/16405>

src/intel/perf/gen_perf.py

@@ -20,6 +20,7 @@
 # IN THE SOFTWARE.
 
 import argparse
+import collections
 import os
 import sys
 import textwrap
@@ -395,7 +396,48 @@ def desc_units(unit):
     return "Unit: " + unit + "."
 
 
-def output_counter_report(set, counter, current_offset):
+counter_key_tuple = collections.namedtuple(
+    'counter_key',
+    [
+        'name',
+        'description',
+        'symbol_name',
+        'mdapi_group',
+        'semantic_type',
+        'data_type',
+        'units',
+    ]
+)
+
+
+def counter_key(counter):
+    return counter_key_tuple._make([counter.get(field) for field in counter_key_tuple._fields])
+
+
+def output_counter_struct(set, counter, idx):
+    data_type = counter.data_type
+    data_type_uc = data_type.upper()
+
+    semantic_type = counter.semantic_type
+    if semantic_type in semantic_type_map:
+        semantic_type = semantic_type_map[semantic_type]
+
+    semantic_type_uc = semantic_type.upper()
+
+    c("[" + str(idx) + "] = {\n")
+    c_indent(3)
+    c(".name = \"" + counter.name + "\",\n")
+    c(".desc = \"" + counter.description + " " + desc_units(counter.units) + "\",\n")
+    c(".symbol_name = \"" + counter.symbol_name + "\",\n")
+    c(".category = \"" + counter.mdapi_group + "\",\n")
+    c(".type = INTEL_PERF_COUNTER_TYPE_" + semantic_type_uc + ",\n")
+    c(".data_type = INTEL_PERF_COUNTER_DATA_TYPE_" + data_type_uc + ",\n")
+    c(".units = INTEL_PERF_COUNTER_UNITS_" + output_units(counter.units) + ",\n")
+    c_outdent(3)
+    c("},\n")
+
+
+def output_counter_report(set, counter, counter_to_idx, current_offset):
     data_type = counter.get('data_type')
     data_type_uc = data_type.upper()
     c_type = data_type
@@ -416,15 +458,18 @@ def output_counter_report(set, counter, current_offset):
         output_availability(set, availability, counter.get('name'))
         c_indent(3)
 
+    key = counter_key(counter)
+    idx = str(counter_to_idx[key])
+
     c("counter = &query->counters[query->n_counters++];\n")
     c("counter->oa_counter_read_" + data_type + " = " + set.read_funcs[counter.get('symbol_name')] + ";\n")
-    c("counter->name = \"" + counter.get('name') + "\";\n")
-    c("counter->desc = \"" + counter.get('description') + " " + desc_units(counter.get('units')) + "\";\n")
-    c("counter->symbol_name = \"" + counter.get('symbol_name') + "\";\n")
-    c("counter->category = \"" + counter.get('mdapi_group') + "\";\n")
-    c("counter->type = INTEL_PERF_COUNTER_TYPE_" + semantic_type_uc + ";\n")
-    c("counter->data_type = INTEL_PERF_COUNTER_DATA_TYPE_" + data_type_uc + ";\n")
-    c("counter->units = INTEL_PERF_COUNTER_UNITS_" + output_units(counter.get('units')) + ";\n")
+    c("counter->name = counters[" + idx + "].name;\n")
+    c("counter->desc = counters[" + idx + "].desc;\n")
+    c("counter->symbol_name = counters[" + idx + "].symbol_name;\n")
+    c("counter->category = counters[" + idx + "].category;\n")
+    c("counter->type = counters[" + idx + "].type;\n")
+    c("counter->data_type = counters[" + idx + "].data_type;\n")
+    c("counter->units = counters[" + idx + "].units;\n")
     c("counter->raw_max = " + set.max_values[counter.get('symbol_name')] + ";\n")
 
     current_offset = pot_align(current_offset, sizeof(c_type))
@@ -696,6 +741,24 @@ def main():
                 output_counter_read(gen, set, counter)
                 output_counter_max(gen, set, counter)
 
+    c("\n")
+    c("static const struct intel_perf_query_counter counters[] = {\n")
+    c_indent(3)
+
+    counter_to_idx = collections.OrderedDict()
+    idx = 0
+    for gen in gens:
+        for set in gen.sets:
+            for counter in set.counters:
+                key = counter_key(counter)
+                if key not in counter_to_idx:
+                    counter_to_idx[key] = idx
+                    output_counter_struct(set, key, idx)
+                    idx += 1
+
+    c_outdent(3)
+    c("};\n")
+
     # Print out all metric sets registration functions for each set in each
     # generation.
     for gen in gens:
@@ -731,7 +794,7 @@ def main():
 
             offset = 0
             for counter in counters:
-                offset = output_counter_report(set, counter, offset)
+                offset = output_counter_report(set, counter, counter_to_idx, offset)
 
 
             c("\nquery->data_size = counter->offset + intel_perf_query_counter_get_size(counter);\n")