[PATCH v9 19/20] tools/perf: Support event code for arch standard events

[Atish Patra <atish.patra@linux.dev>]

From: Atish Patra <atishp@rivosinc.com>

RISC-V relies on the event encoding from the json file. That includes
arch standard events. If event code is present, event is already updated
with correct encoding. No need to update it again which results in losing
the event encoding.

Signed-off-by: Atish Patra <atishp@rivosinc.com>
Reviewed-by: Ian Rogers <irogers@google.com>
---
 tools/perf/pmu-events/arch/riscv/arch-standard.json | 10 ++++++++++
 tools/perf/pmu-events/jevents.py                    |  9 ++++++++-
 2 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/tools/perf/pmu-events/arch/riscv/arch-standard.json b/tools/perf/pmu-events/arch/riscv/arch-standard.json
new file mode 100644
index 000000000000..96e21f088558
--- /dev/null
+++ b/tools/perf/pmu-events/arch/riscv/arch-standard.json
@@ -0,0 +1,10 @@
+[
+  {
+    "EventName": "cycles",
+    "BriefDescription": "cycle executed"
+  },
+  {
+    "EventName": "instructions",
+    "BriefDescription": "instruction retired"
+  }
+]
diff --git a/tools/perf/pmu-events/jevents.py b/tools/perf/pmu-events/jevents.py
index 376dc2d24162..e9c6b7990880 100755
--- a/tools/perf/pmu-events/jevents.py
+++ b/tools/perf/pmu-events/jevents.py
@@ -413,7 +413,14 @@ class JsonEvent:
         self.long_desc = None
     if arch_std:
       if arch_std.lower() in _arch_std_events:
-        event = _arch_std_events[arch_std.lower()].event
+        # Inherit the arch-standard encoding only if this event defines no
+        # explicit encoding of its own. Events with explicit EventCode,
+        # ConfigCode, etc. may carry alternate encodings and appended modifiers
+        # that must survive.
+        if ('EventCode' not in jd and 'ExtSel' not in jd and
+            configcode is None and eventidcode is None and
+            legacy_hw_config is None and legacy_cache_config is None):
+          event = _arch_std_events[arch_std.lower()].event
         # Copy from the architecture standard event to self for undefined fields.
         for attr, value in _arch_std_events[arch_std.lower()].__dict__.items():
           if hasattr(self, attr) and not getattr(self, attr):

-- 
2.53.0-Meta