perf list: Generalize limiting to a PMU name

Deprecate the --cputype option and add a --unit option where '--unit
cpu_atom' behaves like '--cputype atom'. The --unit option can be used
with arbitrary PMUs, for example:

```
$ perf list --unit msr pmu

List of pre-defined events (to be used in -e or -M):

  msr/aperf/                                         [Kernel PMU event]
  msr/cpu_thermal_margin/                            [Kernel PMU event]
  msr/mperf/                                         [Kernel PMU event]
  msr/pperf/                                         [Kernel PMU event]
  msr/smi/                                           [Kernel PMU event]
  msr/tsc/                                           [Kernel PMU event]
```
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Caleb Biggers <caleb.biggers@intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Perry Taylor <perry.taylor@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Stephane Eranian <eranian@google.com>
Cc: Weilin Wang <weilin.wang@intel.com>
Cc: Xin Gao <gaoxin@cdjrlc.com>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Link: http://lore.kernel.org/lkml/20221114210723.2749751-6-irogers@google.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/Documentation/perf-list.txt

@@ -39,9 +39,9 @@ any extra expressions computed by perf stat.
 --deprecated::
 Print deprecated events. By default the deprecated events are hidden.
 
---cputype::
-Print events applying cpu with this type for hybrid platform
-(e.g. --cputype core or --cputype atom)
+--unit::
+Print PMU events and metrics limited to the specific PMU name.
+(e.g. --unit cpu, --unit msr, --unit cpu_core, --unit cpu_atom)
 
 [[EVENT_MODIFIERS]]
 EVENT MODIFIERS

tools/perf/builtin-list.c

@@ -21,7 +21,6 @@
 
 static bool desc_flag = true;
 static bool details_flag;
-static const char *hybrid_type;
 
 int cmd_list(int argc, const char **argv)
 {
@@ -30,6 +29,8 @@ int cmd_list(int argc, const char **argv)
 	bool long_desc_flag = false;
 	bool deprecated = false;
 	char *pmu_name = NULL;
+	const char *hybrid_name = NULL;
+	const char *unit_name = NULL;
 	struct option list_options[] = {
 		OPT_BOOLEAN(0, "raw-dump", &raw_dump, "Dump raw events"),
 		OPT_BOOLEAN('d', "desc", &desc_flag,
@@ -40,9 +41,10 @@ int cmd_list(int argc, const char **argv)
 			    "Print information on the perf event names and expressions used internally by events."),
 		OPT_BOOLEAN(0, "deprecated", &deprecated,
 			    "Print deprecated events."),
-		OPT_STRING(0, "cputype", &hybrid_type, "hybrid cpu type",
-			   "Print events applying cpu with this type for hybrid platform "
-			   "(e.g. core or atom)"),
+		OPT_STRING(0, "cputype", &hybrid_name, "hybrid cpu type",
+			   "Limit PMU or metric printing to the given hybrid PMU (e.g. core or atom)."),
+		OPT_STRING(0, "unit", &unit_name, "PMU name",
+			   "Limit PMU or metric printing to the specified PMU."),
 		OPT_INCR(0, "debug", &verbose,
 			     "Enable debugging output"),
 		OPT_END()
@@ -53,6 +55,8 @@ int cmd_list(int argc, const char **argv)
 	};
 
 	set_option_flag(list_options, 0, "raw-dump", PARSE_OPT_HIDDEN);
+	/* Hide hybrid flag for the more generic 'unit' flag. */
+	set_option_flag(list_options, 0, "cputype", PARSE_OPT_HIDDEN);
 
 	argc = parse_options(argc, argv, list_options, list_usage,
 			     PARSE_OPT_STOP_AT_NON_OPTION);
@@ -62,8 +66,10 @@ int cmd_list(int argc, const char **argv)
 	if (!raw_dump && pager_in_use())
 		printf("\nList of pre-defined events (to be used in -e or -M):\n\n");
 
-	if (hybrid_type) {
-		pmu_name = perf_pmu__hybrid_type_to_pmu(hybrid_type);
+	if (unit_name)
+		pmu_name = strdup(unit_name);
+	else if (hybrid_name) {
+		pmu_name = perf_pmu__hybrid_type_to_pmu(hybrid_name);
 		if (!pmu_name)
 			pr_warning("WARNING: hybrid cputype is not supported!\n");
 	}

tools/perf/util/metricgroup.c

@@ -556,11 +556,12 @@ static int metricgroup__print_callback(const struct pmu_event *pe,
 				       void *vdata)
 {
 	struct metricgroup_print_data *data = vdata;
+	const char *pmu = pe->pmu ?: "cpu";
 
 	if (!pe->metric_expr)
 		return 0;
 
-	if (data->pmu_name && perf_pmu__is_hybrid(pe->pmu) && strcmp(data->pmu_name, pe->pmu))
+	if (data->pmu_name && strcmp(data->pmu_name, pmu))
 		return 0;
 
 	return metricgroup__print_pmu_event(pe, data->metricgroups, data->filter,

tools/perf/util/pmu.c

@@ -1695,10 +1695,8 @@ void print_pmu_events(const char *event_glob, bool name_only, bool quiet_flag,
 	pmu = NULL;
 	j = 0;
 	while ((pmu = perf_pmu__scan(pmu)) != NULL) {
-		if (pmu_name && perf_pmu__is_hybrid(pmu->name) &&
-		    strcmp(pmu_name, pmu->name)) {
+		if (pmu_name && pmu->name && strcmp(pmu_name, pmu->name))
 			continue;
-		}
 
 		list_for_each_entry(alias, &pmu->aliases, list) {
 			char *name = alias->desc ? alias->name :