perf pmu-events: Hide pmu_events_map

Move usage of the table to pmu-events.c so it may be hidden. By
abstracting the table the implementation can later be changed.

Signed-off-by: Ian Rogers <[email protected]>
Cc: Adrian Hunter <[email protected]>
Cc: Alexander Shishkin <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: James Clark <[email protected]>
Cc: Jiri Olsa <[email protected]>
Cc: John Garry <[email protected]>
Cc: Kan Liang <[email protected]>
Cc: Leo Yan <[email protected]>
Cc: Mark Rutland <[email protected]>
Cc: Mike Leach <[email protected]>
Cc: Namhyung Kim <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ravi Bangoria <[email protected]>
Cc: Stephane Eranian <[email protected]>
Cc: Will Deacon <[email protected]>
Cc: Xing Zhengjun <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Arnaldo Carvalho de Melo <[email protected]>

Author: captain5050

tools/perf/pmu-events/empty-pmu-events.c

@@ -6,6 +6,8 @@
  * The test cpu/soc is provided for testing.
  */
 #include "pmu-events/pmu-events.h"
+#include "util/header.h"
+#include "util/pmu.h"
 #include <string.h>
 #include <stddef.h>
 
@@ -110,7 +112,26 @@ static const struct pmu_event pme_test_soc_cpu[] = {
 	},
 };
 
-const struct pmu_events_map pmu_events_map[] = {
+
+/*
+ * Map a CPU to its table of PMU events. The CPU is identified by the
+ * cpuid field, which is an arch-specific identifier for the CPU.
+ * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
+ * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
+ *
+ * The  cpuid can contain any character other than the comma.
+ */
+struct pmu_events_map {
+	const char *arch;
+	const char *cpuid;
+	const struct pmu_event *table;
+};
+
+/*
+ * Global table mapping each known CPU for the architecture to its
+ * table of PMU events.
+ */
+static const struct pmu_events_map pmu_events_map[] = {
 	{
 		.arch = "testarch",
 		.cpuid = "testcpu",
@@ -162,6 +183,62 @@ static const struct pmu_sys_events pmu_sys_event_tables[] = {
 	},
 };
 
+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu)
+{
+	const struct pmu_event *table = NULL;
+	char *cpuid = perf_pmu__getcpuid(pmu);
+	int i;
+
+	/* on some platforms which uses cpus map, cpuid can be NULL for
+	 * PMUs other than CORE PMUs.
+	 */
+	if (!cpuid)
+		return NULL;
+
+	i = 0;
+	for (;;) {
+		const struct pmu_events_map *map = &pmu_events_map[i++];
+
+		if (!map->table)
+			break;
+
+		if (!strcmp_cpuid_str(map->cpuid, cpuid)) {
+			table = map->table;
+			break;
+		}
+	}
+	free(cpuid);
+	return table;
+}
+
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid)
+{
+	for (const struct pmu_events_map *tables = &pmu_events_map[0];
+	     tables->table;
+	     tables++) {
+		if (!strcmp(tables->arch, arch) && !strcmp_cpuid_str(tables->cpuid, cpuid))
+			return tables->table;
+	}
+	return NULL;
+}
+
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data)
+{
+	for (const struct pmu_events_map *tables = &pmu_events_map[0];
+	     tables->table;
+	     tables++) {
+		for (const struct pmu_event *pe = &tables->table[0];
+		     pe->name || pe->metric_group || pe->metric_name;
+		     pe++) {
+			int ret = fn(pe, &tables->table[0], data);
+
+			if (ret)
+				return ret;
+		}
+	}
+	return 0;
+}
+
 const struct pmu_event *find_sys_events_table(const char *name)
 {
 	for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
@@ -181,7 +258,7 @@ int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data)
 		for (const struct pmu_event *pe = &tables->table[0];
 		     pe->name || pe->metric_group || pe->metric_name;
 		     pe++) {
-			int ret = fn(pe, data);
+			int ret = fn(pe, &tables->table[0], data);
 
 			if (ret)
 				return ret;

tools/perf/pmu-events/jevents.py

@@ -334,7 +334,27 @@ def is_leaf_dir(path: str) -> bool:
 
 def print_mapping_table(archs: Sequence[str]) -> None:
   """Read the mapfile and generate the struct from cpuid string to event table."""
-  _args.output_file.write('const struct pmu_events_map pmu_events_map[] = {\n')
+  _args.output_file.write("""
+/*
+ * Map a CPU to its table of PMU events. The CPU is identified by the
+ * cpuid field, which is an arch-specific identifier for the CPU.
+ * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
+ * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
+ *
+ * The  cpuid can contain any character other than the comma.
+ */
+struct pmu_events_map {
+        const char *arch;
+        const char *cpuid;
+        const struct pmu_event *table;
+};
+
+/*
+ * Global table mapping each known CPU for the architecture to its
+ * table of PMU events.
+ */
+const struct pmu_events_map pmu_events_map[] = {
+""")
   for arch in archs:
     if arch == 'test':
       _args.output_file.write("""{
@@ -390,6 +410,61 @@ def print_system_mapping_table() -> None:
 \t},
 };
 
+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu)
+{
+        const struct pmu_event *table = NULL;
+        char *cpuid = perf_pmu__getcpuid(pmu);
+        int i;
+
+        /* on some platforms which uses cpus map, cpuid can be NULL for
+         * PMUs other than CORE PMUs.
+         */
+        if (!cpuid)
+                return NULL;
+
+        i = 0;
+        for (;;) {
+                const struct pmu_events_map *map = &pmu_events_map[i++];
+                if (!map->table)
+                        break;
+
+                if (!strcmp_cpuid_str(map->cpuid, cpuid)) {
+                        table = map->table;
+                        break;
+                }
+        }
+        free(cpuid);
+        return table;
+}
+
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid)
+{
+        for (const struct pmu_events_map *tables = &pmu_events_map[0];
+             tables->table;
+             tables++) {
+                if (!strcmp(tables->arch, arch) && !strcmp_cpuid_str(tables->cpuid, cpuid))
+                        return tables->table;
+        }
+        return NULL;
+}
+
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data)
+{
+        for (const struct pmu_events_map *tables = &pmu_events_map[0];
+             tables->table;
+             tables++) {
+                for (const struct pmu_event *pe = &tables->table[0];
+                     pe->name || pe->metric_group || pe->metric_name;
+                     pe++) {
+                        int ret = fn(pe, &tables->table[0], data);
+
+                        if (ret)
+                                return ret;
+                }
+        }
+        return 0;
+}
+
 const struct pmu_event *find_sys_events_table(const char *name)
 {
         for (const struct pmu_sys_events *tables = &pmu_sys_event_tables[0];
@@ -409,7 +484,7 @@ def print_system_mapping_table() -> None:
                 for (const struct pmu_event *pe = &tables->table[0];
                      pe->name || pe->metric_group || pe->metric_name;
                      pe++) {
-                        int ret = fn(pe, data);
+                        int ret = fn(pe, &tables->table[0], data);
 
                         if (ret)
                                 return ret;
@@ -450,6 +525,8 @@ def ftw(path: str, parents: Sequence[str],
 
   _args.output_file.write("""
 #include "pmu-events/pmu-events.h"
+#include "util/header.h"
+#include "util/pmu.h"
 #include <string.h>
 #include <stddef.h>
 

tools/perf/pmu-events/pmu-events.h

@@ -2,6 +2,8 @@
 #ifndef PMU_EVENTS_H
 #define PMU_EVENTS_H
 
+struct perf_pmu;
+
 enum aggr_mode_class {
 	PerChip = 1,
 	PerCore
@@ -28,30 +30,15 @@ struct pmu_event {
 	const char *metric_constraint;
 };
 
-/*
- *
- * Map a CPU to its table of PMU events. The CPU is identified by the
- * cpuid field, which is an arch-specific identifier for the CPU.
- * The identifier specified in tools/perf/pmu-events/arch/xxx/mapfile
- * must match the get_cpuid_str() in tools/perf/arch/xxx/util/header.c)
- *
- * The  cpuid can contain any character other than the comma.
- */
-struct pmu_events_map {
-	const char *arch;
-	const char *cpuid;
-	const struct pmu_event *table;
-};
+typedef int (*pmu_event_iter_fn)(const struct pmu_event *pe,
+				 const struct pmu_event *table,
+				 void *data);
 
-/*
- * Global table mapping each known CPU for the architecture to its
- * table of PMU events.
- */
-extern const struct pmu_events_map pmu_events_map[];
+const struct pmu_event *perf_pmu__find_table(struct perf_pmu *pmu);
+const struct pmu_event *find_core_events_table(const char *arch, const char *cpuid);
+int pmu_for_each_core_event(pmu_event_iter_fn fn, void *data);
 
 const struct pmu_event *find_sys_events_table(const char *name);
-
-typedef int (*pmu_event_iter_fn)(const struct pmu_event *pe, void *data);
 int pmu_for_each_sys_event(pmu_event_iter_fn fn, void *data);
 
 #endif