[PATCH v6 16/22] perf jevents: Add mem_bw metric for Intel

[Ian Rogers <irogers@google.com>]

Break down memory bandwidth using uncore counters. For many models
this matches the memory_bandwidth_* metrics, but these metrics aren't
made available on all models. Add support for free running counters.
Query the event json when determining which what events/counters are
available.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/pmu-events/intel_metrics.py | 62 ++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/tools/perf/pmu-events/intel_metrics.py b/tools/perf/pmu-events/intel_metrics.py
index fb15ba6b9f90..f7a9186bdf40 100755
--- a/tools/perf/pmu-events/intel_metrics.py
+++ b/tools/perf/pmu-events/intel_metrics.py
@@ -800,6 +800,67 @@ def IntelLdSt() -> Optional[MetricGroup]:
   ], description = "Breakdown of load/store instructions")
 
 
+def UncoreMemBw() -> Optional[MetricGroup]:
+  mem_events = []
+  try:
+    mem_events = json.load(open(f"{os.path.dirname(os.path.realpath(__file__))}"
+                                f"/arch/x86/{args.model}/uncore-memory.json"))
+  except:
+    pass
+
+  ddr_rds = 0
+  ddr_wrs = 0
+  ddr_total = 0
+  for x in mem_events:
+    if "EventName" in x:
+      name = x["EventName"]
+      if re.search("^UNC_MC[0-9]+_RDCAS_COUNT_FREERUN", name):
+        ddr_rds += Event(name)
+      elif re.search("^UNC_MC[0-9]+_WRCAS_COUNT_FREERUN", name):
+        ddr_wrs += Event(name)
+      #elif re.search("^UNC_MC[0-9]+_TOTAL_REQCOUNT_FREERUN", name):
+      #  ddr_total += Event(name)
+
+  if ddr_rds == 0:
+    try:
+      ddr_rds = Event("UNC_M_CAS_COUNT.RD")
+      ddr_wrs = Event("UNC_M_CAS_COUNT.WR")
+    except:
+      return None
+
+  ddr_total = ddr_rds + ddr_wrs
+
+  pmm_rds = 0
+  pmm_wrs = 0
+  try:
+    pmm_rds = Event("UNC_M_PMM_RPQ_INSERTS")
+    pmm_wrs = Event("UNC_M_PMM_WPQ_INSERTS")
+  except:
+    pass
+
+  pmm_total = pmm_rds + pmm_wrs
+
+  scale = 64 / 1_000_000
+  return MetricGroup("lpm_mem_bw", [
+      MetricGroup("lpm_mem_bw_ddr", [
+          Metric("lpm_mem_bw_ddr_read", "DDR memory read bandwidth",
+                 d_ratio(ddr_rds, interval_sec), f"{scale}MB/s"),
+          Metric("lpm_mem_bw_ddr_write", "DDR memory write bandwidth",
+                 d_ratio(ddr_wrs, interval_sec), f"{scale}MB/s"),
+          Metric("lpm_mem_bw_ddr_total", "DDR memory write bandwidth",
+                 d_ratio(ddr_total, interval_sec), f"{scale}MB/s"),
+      ], description = "DDR Memory Bandwidth"),
+      MetricGroup("lpm_mem_bw_pmm", [
+          Metric("lpm_mem_bw_pmm_read", "PMM memory read bandwidth",
+                 d_ratio(pmm_rds, interval_sec), f"{scale}MB/s"),
+          Metric("lpm_mem_bw_pmm_write", "PMM memory write bandwidth",
+                 d_ratio(pmm_wrs, interval_sec), f"{scale}MB/s"),
+          Metric("lpm_mem_bw_pmm_total", "PMM memory write bandwidth",
+                 d_ratio(pmm_total, interval_sec), f"{scale}MB/s"),
+      ], description = "PMM Memory Bandwidth") if pmm_rds != 0 else None,
+  ], description = "Memory Bandwidth")
+
+
 def main() -> None:
   global _args
 
@@ -836,6 +897,7 @@ def main() -> None:
       IntelMlp(),
       IntelPorts(),
       IntelSwpf(),
+      UncoreMemBw(),
   ])
 
 
-- 
2.51.0.338.gd7d06c2dae-goog