perf mem: Clean up perf_pmus__num_mem_pmus()

The number of mem PMUs can be calculated by searching the
perf_pmus__scan_mem().

Remove the ARCH specific perf_pmus__num_mem_pmus()

Tested-by: Leo Yan <[e-mail]>
Signed-off-by: Kan Liang <[e-mail]>
Reviewed-by: Ian Rogers <[e-mail]>
Cc: [e-mail]
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Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Namhyung Kim <[e-mail]>

tools/perf/arch/x86/util/pmu.c

···
 			pmu->mem_events = perf_mem_events_intel;
 	}
 }
-
-int perf_pmus__num_mem_pmus(void)
-{
-	/* AMD uses IBS OP pmu and not a core PMU for perf mem/c2c */
-	if (x86__is_amd_cpu())
-		return 1;
-
-	/* Intel uses core pmus for perf mem/c2c */
-	return perf_pmus__num_core_pmus();
-}

tools/perf/builtin-c2c.c

···
 			     PARSE_OPT_KEEP_UNKNOWN);
 
 	/* Max number of arguments multiplied by number of PMUs that can support them. */
-	rec_argc = argc + 11 * perf_pmus__num_mem_pmus();
+	rec_argc = argc + 11 * (perf_pmu__mem_events_num_mem_pmus(pmu) + 1);
 
 	rec_argv = calloc(rec_argc + 1, sizeof(char *));
 	if (!rec_argv)

tools/perf/builtin-mem.c

···
 			     PARSE_OPT_KEEP_UNKNOWN);
 
 	/* Max number of arguments multiplied by number of PMUs that can support them. */
-	rec_argc = argc + 9 * perf_pmus__num_mem_pmus();
+	rec_argc = argc + 9 * (perf_pmu__mem_events_num_mem_pmus(pmu) + 1);
 
 	if (mem->cpu_list)
 		rec_argc += 2;

tools/perf/util/mem-events.c

···
 	return perf_pmus__scan_mem(NULL);
 }
 
+/**
+ * perf_pmu__mem_events_num_mem_pmus - Get the number of mem PMUs since the given pmu
+ * @pmu: Start pmu. If it's NULL, search the entire PMU list.
+ */
+int perf_pmu__mem_events_num_mem_pmus(struct perf_pmu *pmu)
+{
+	int num = 0;
+
+	while ((pmu = perf_pmus__scan_mem(pmu)) != NULL)
+		num++;
+
+	return num;
+}
+
 static const char *perf_pmu__mem_events_name(int i, struct perf_pmu *pmu)
 {
 	struct perf_mem_event *e;

tools/perf/util/mem-events.h

···
 
 struct perf_mem_event *perf_pmu__mem_events_ptr(struct perf_pmu *pmu, int i);
 struct perf_pmu *perf_mem_events_find_pmu(void);
+int perf_pmu__mem_events_num_mem_pmus(struct perf_pmu *pmu);
 bool is_mem_loads_aux_event(struct evsel *leader);
 
 void perf_pmu__mem_events_list(struct perf_pmu *pmu);

tools/perf/util/pmus.c

···
 	return NULL;
 }
 
-int __weak perf_pmus__num_mem_pmus(void)
-{
-	/* All core PMUs are for mem events. */
-	return perf_pmus__num_core_pmus();
-}
-
 /** Struct for ordering events as output in perf list. */
 struct sevent {
 	/** PMU for event. */

tools/perf/util/pmus.h

···
 
 const struct perf_pmu *perf_pmus__pmu_for_pmu_filter(const char *str);
 
-int perf_pmus__num_mem_pmus(void);
 void perf_pmus__print_pmu_events(const struct print_callbacks *print_cb, void *print_state);
 bool perf_pmus__have_event(const char *pname, const char *name);
 int perf_pmus__num_core_pmus(void);