perf vendor events arm64: Add PE utilization metrics for neoverse-n2-v2

Add PE utilization related metrics. In cpu_utilization metric, if it is
neoverse-n2 which slots are 5, the real stall_slot need to subtract the
cpu_cycles according to the neoverse-n2 errata [0].

[0] https://documentation-service.arm.com/static/636a66a64e6cf12278ad89cb?token=

Reviewed-by: John Garry <[e-mail]>
Signed-off-by: Jing Zhang <[e-mail]>
Acked-by: Ian Rogers <[e-mail]>
Cc: Alexander Shishkin <[e-mail]>
Cc: Andrew Kilroy <[e-mail]>
Cc: Ingo Molnar <[e-mail]>
Cc: James Clark <[e-mail]>
Cc: Jiri Olsa <[e-mail]>
Cc: Leo Yan <[e-mail]>
Cc: Mark Rutland <[e-mail]>
Cc: Mike Leach <[e-mail]>
Cc: Namhyung Kim <[e-mail]>
Cc: Peter Zijlstra <[e-mail]>
Cc: Shuai Xue <[e-mail]>
Cc: Will Deacon <[e-mail]>
Cc: Xing Zhengjun <[e-mail]>
Cc: Zhuo Song <[e-mail]>
Cc: [e-mail]
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Arnaldo Carvalho de Melo <[e-mail]>

tools/perf/pmu-events/arch/arm64/arm/neoverse-n2-v2/metrics.json

···
         "MetricGroup": "Branch",
         "MetricName": "branch_miss_pred_rate",
         "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "instructions / CPU_CYCLES",
+        "BriefDescription": "The average number of instructions executed for each cycle.",
+        "MetricGroup": "PEutilization",
+        "MetricName": "ipc"
+    },
+    {
+        "MetricExpr": "ipc / 5",
+        "BriefDescription": "IPC percentage of peak. The peak of IPC is 5.",
+        "MetricGroup": "PEutilization",
+        "MetricName": "ipc_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "INST_RETIRED / CPU_CYCLES",
+        "BriefDescription": "Architecturally executed Instructions Per Cycle (IPC)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "retired_ipc"
+    },
+    {
+        "MetricExpr": "INST_SPEC / CPU_CYCLES",
+        "BriefDescription": "Speculatively executed Instructions Per Cycle (IPC)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "spec_ipc"
+    },
+    {
+        "MetricExpr": "OP_RETIRED / OP_SPEC",
+        "BriefDescription": "Of all the micro-operations issued, what percentage are retired(committed)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "retired_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "1 - OP_RETIRED / OP_SPEC",
+        "BriefDescription": "Of all the micro-operations issued, what percentage are not retired(committed)",
+        "MetricGroup": "PEutilization",
+        "MetricName": "wasted_rate",
+        "ScaleUnit": "100%"
+    },
+    {
+        "MetricExpr": "OP_RETIRED / OP_SPEC * (1 - (STALL_SLOT if (#slots - 5) else (STALL_SLOT - CPU_CYCLES)) / (#slots * CPU_CYCLES))",
+        "BriefDescription": "The truly effective ratio of micro-operations executed by the CPU, which means that misprediction and stall are not included",
+        "MetricGroup": "PEutilization",
+        "MetricName": "cpu_utilization",
+        "ScaleUnit": "100%"
     }
 ]