Date:   Mon,  7 Sep 2020 12:11:30 +0530
From:   Kajol Jain <kjain@...ux.ibm.com>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
        alexander.shishkin@...ux.intel.com, pc@...ibm.com,
        jolsa@...hat.com, namhyung@...nel.org, ak@...ux.intel.com,
        yao.jin@...ux.intel.com, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org, irogers@...gle.com,
        maddy@...ux.ibm.com, ravi.bangoria@...ux.ibm.com,
        john.garry@...wei.com, kjain@...ux.ibm.com
Subject: [PATCH v9 2/5] perf/jevents: Add new structure to pass json fields.

This patch adds new structure called 'json_event' inside jevents.c
file to improve the callback prototype inside jevent files.
Initially, whenever user want to add new field, they need to update
in all function callback which make it more and more complex with
increased number of parmeters.
With this change, we just need to add it in new structure 'json_event'.

Signed-off-by: Kajol Jain <kjain@...ux.ibm.com>
Reviewed-by: Andi Kleen <ak@...ux.intel.com>
Reviewed-by: John Garry <john.garry@...wei.com>
---
 tools/perf/pmu-events/jevents.c | 212 +++++++++++++++-----------------
 1 file changed, 97 insertions(+), 115 deletions(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index b9b938aaff16..db334b2fd896 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -52,6 +52,23 @@
 int verbose;
 char *prog;
 
+struct json_event {
+	char *name;
+	char *event;
+	char *desc;
+	char *long_desc;
+	char *pmu;
+	char *unit;
+	char *perpkg;
+	char *metric_expr;
+	char *metric_name;
+	char *metric_group;
+	char *deprecated;
+	char *metric_constraint;
+};
+
+typedef int (*func)(void *data, struct json_event *je);
+
 int eprintf(int level, int var, const char *fmt, ...)
 {
 
@@ -70,11 +87,6 @@ int eprintf(int level, int var, const char *fmt, ...)
 	return ret;
 }
 
-__attribute__((weak)) char *get_cpu_str(void)
-{
-	return NULL;
-}
-
 static void addfield(char *map, char **dst, const char *sep,
 		     const char *a, jsmntok_t *bt)
 {
@@ -317,12 +329,7 @@ static void print_events_table_prefix(FILE *fp, const char *tblname)
 	close_table = 1;
 }
 
-static int print_events_table_entry(void *data, char *name, char *event,
-				    char *desc, char *long_desc,
-				    char *pmu, char *unit, char *perpkg,
-				    char *metric_expr,
-				    char *metric_name, char *metric_group,
-				    char *deprecated, char *metric_constraint)
+static int print_events_table_entry(void *data, struct json_event *je)
 {
 	struct perf_entry_data *pd = data;
 	FILE *outfp = pd->outfp;
@@ -334,30 +341,30 @@ static int print_events_table_entry(void *data, char *name, char *event,
 	 */
 	fprintf(outfp, "{\n");
 
-	if (name)
-		fprintf(outfp, "\t.name = \"%s\",\n", name);
-	if (event)
-		fprintf(outfp, "\t.event = \"%s\",\n", event);
-	fprintf(outfp, "\t.desc = \"%s\",\n", desc);
+	if (je->name)
+		fprintf(outfp, "\t.name = \"%s\",\n", je->name);
+	if (je->event)
+		fprintf(outfp, "\t.event = \"%s\",\n", je->event);
+	fprintf(outfp, "\t.desc = \"%s\",\n", je->desc);
 	fprintf(outfp, "\t.topic = \"%s\",\n", topic);
-	if (long_desc && long_desc[0])
-		fprintf(outfp, "\t.long_desc = \"%s\",\n", long_desc);
-	if (pmu)
-		fprintf(outfp, "\t.pmu = \"%s\",\n", pmu);
-	if (unit)
-		fprintf(outfp, "\t.unit = \"%s\",\n", unit);
-	if (perpkg)
-		fprintf(outfp, "\t.perpkg = \"%s\",\n", perpkg);
-	if (metric_expr)
-		fprintf(outfp, "\t.metric_expr = \"%s\",\n", metric_expr);
-	if (metric_name)
-		fprintf(outfp, "\t.metric_name = \"%s\",\n", metric_name);
-	if (metric_group)
-		fprintf(outfp, "\t.metric_group = \"%s\",\n", metric_group);
-	if (deprecated)
-		fprintf(outfp, "\t.deprecated = \"%s\",\n", deprecated);
-	if (metric_constraint)
-		fprintf(outfp, "\t.metric_constraint = \"%s\",\n", metric_constraint);
+	if (je->long_desc && je->long_desc[0])
+		fprintf(outfp, "\t.long_desc = \"%s\",\n", je->long_desc);
+	if (je->pmu)
+		fprintf(outfp, "\t.pmu = \"%s\",\n", je->pmu);
+	if (je->unit)
+		fprintf(outfp, "\t.unit = \"%s\",\n", je->unit);
+	if (je->perpkg)
+		fprintf(outfp, "\t.perpkg = \"%s\",\n", je->perpkg);
+	if (je->metric_expr)
+		fprintf(outfp, "\t.metric_expr = \"%s\",\n", je->metric_expr);
+	if (je->metric_name)
+		fprintf(outfp, "\t.metric_name = \"%s\",\n", je->metric_name);
+	if (je->metric_group)
+		fprintf(outfp, "\t.metric_group = \"%s\",\n", je->metric_group);
+	if (je->deprecated)
+		fprintf(outfp, "\t.deprecated = \"%s\",\n", je->deprecated);
+	if (je->metric_constraint)
+		fprintf(outfp, "\t.metric_constraint = \"%s\",\n", je->metric_constraint);
 	fprintf(outfp, "},\n");
 
 	return 0;
@@ -379,17 +386,17 @@ struct event_struct {
 	char *metric_constraint;
 };
 
-#define ADD_EVENT_FIELD(field) do { if (field) {		\
-	es->field = strdup(field);				\
+#define ADD_EVENT_FIELD(field) do { if (je->field) {		\
+	es->field = strdup(je->field);				\
 	if (!es->field)						\
 		goto out_free;					\
 } } while (0)
 
 #define FREE_EVENT_FIELD(field) free(es->field)
 
-#define TRY_FIXUP_FIELD(field) do { if (es->field && !*field) {\
-	*field = strdup(es->field);				\
-	if (!*field)						\
+#define TRY_FIXUP_FIELD(field) do { if (es->field && !je->field) {\
+	je->field = strdup(es->field);				\
+	if (!je->field)						\
 		return -ENOMEM;					\
 } } while (0)
 
@@ -420,11 +427,7 @@ static void free_arch_std_events(void)
 	}
 }
 
-static int save_arch_std_events(void *data, char *name, char *event,
-				char *desc, char *long_desc, char *pmu,
-				char *unit, char *perpkg, char *metric_expr,
-				char *metric_name, char *metric_group,
-				char *deprecated, char *metric_constraint)
+static int save_arch_std_events(void *data, struct json_event *je)
 {
 	struct event_struct *es;
 
@@ -484,11 +487,8 @@ static char *real_event(const char *name, char *event)
 }
 
 static int
-try_fixup(const char *fn, char *arch_std, char **event, char **desc,
-	  char **name, char **long_desc, char **pmu, char **filter,
-	  char **perpkg, char **unit, char **metric_expr, char **metric_name,
-	  char **metric_group, unsigned long long eventcode,
-	  char **deprecated, char **metric_constraint)
+try_fixup(const char *fn, char *arch_std, unsigned long long eventcode,
+	  struct json_event *je)
 {
 	/* try to find matching event from arch standard values */
 	struct event_struct *es;
@@ -497,8 +497,8 @@ try_fixup(const char *fn, char *arch_std, char **event, char **desc,
 		if (!strcmp(arch_std, es->name)) {
 			if (!eventcode && es->event) {
 				/* allow EventCode to be overridden */
-				free(*event);
-				*event = NULL;
+				free(je->event);
+				je->event = NULL;
 			}
 			FOR_ALL_EVENT_STRUCT_FIELDS(TRY_FIXUP_FIELD);
 			return 0;
@@ -512,13 +512,8 @@ try_fixup(const char *fn, char *arch_std, char **event, char **desc,
 
 /* Call func with each event in the json file */
 static int json_events(const char *fn,
-	  int (*func)(void *data, char *name, char *event, char *desc,
-		      char *long_desc,
-		      char *pmu, char *unit, char *perpkg,
-		      char *metric_expr,
-		      char *metric_name, char *metric_group,
-		      char *deprecated, char *metric_constraint),
-	  void *data)
+		int (*func)(void *data, struct json_event *je),
+			void *data)
 {
 	int err;
 	size_t size;
@@ -536,18 +531,10 @@ static int json_events(const char *fn,
 	EXPECT(tokens->type == JSMN_ARRAY, tokens, "expected top level array");
 	tok = tokens + 1;
 	for (i = 0; i < tokens->size; i++) {
-		char *event = NULL, *desc = NULL, *name = NULL;
-		char *long_desc = NULL;
+		char *event = NULL;
 		char *extra_desc = NULL;
-		char *pmu = NULL;
 		char *filter = NULL;
-		char *perpkg = NULL;
-		char *unit = NULL;
-		char *metric_expr = NULL;
-		char *metric_name = NULL;
-		char *metric_group = NULL;
-		char *deprecated = NULL;
-		char *metric_constraint = NULL;
+		struct json_event je = {};
 		char *arch_std = NULL;
 		unsigned long long eventcode = 0;
 		struct msrmap *msr = NULL;
@@ -582,14 +569,14 @@ static int json_events(const char *fn,
 				eventcode |= strtoul(code, NULL, 0) << 21;
 				free(code);
 			} else if (json_streq(map, field, "EventName")) {
-				addfield(map, &name, "", "", val);
+				addfield(map, &je.name, "", "", val);
 			} else if (json_streq(map, field, "BriefDescription")) {
-				addfield(map, &desc, "", "", val);
-				fixdesc(desc);
+				addfield(map, &je.desc, "", "", val);
+				fixdesc(je.desc);
 			} else if (json_streq(map, field,
 					     "PublicDescription")) {
-				addfield(map, &long_desc, "", "", val);
-				fixdesc(long_desc);
+				addfield(map, &je.long_desc, "", "", val);
+				fixdesc(je.long_desc);
 			} else if (json_streq(map, field, "PEBS") && nz) {
 				precise = val;
 			} else if (json_streq(map, field, "MSRIndex") && nz) {
@@ -609,34 +596,34 @@ static int json_events(const char *fn,
 
 				ppmu = field_to_perf(unit_to_pmu, map, val);
 				if (ppmu) {
-					pmu = strdup(ppmu);
+					je.pmu = strdup(ppmu);
 				} else {
-					if (!pmu)
-						pmu = strdup("uncore_");
-					addfield(map, &pmu, "", "", val);
-					for (s = pmu; *s; s++)
+					if (!je.pmu)
+						je.pmu = strdup("uncore_");
+					addfield(map, &je.pmu, "", "", val);
+					for (s = je.pmu; *s; s++)
 						*s = tolower(*s);
 				}
-				addfield(map, &desc, ". ", "Unit: ", NULL);
-				addfield(map, &desc, "", pmu, NULL);
-				addfield(map, &desc, "", " ", NULL);
+				addfield(map, &je.desc, ". ", "Unit: ", NULL);
+				addfield(map, &je.desc, "", je.pmu, NULL);
+				addfield(map, &je.desc, "", " ", NULL);
 			} else if (json_streq(map, field, "Filter")) {
 				addfield(map, &filter, "", "", val);
 			} else if (json_streq(map, field, "ScaleUnit")) {
-				addfield(map, &unit, "", "", val);
+				addfield(map, &je.unit, "", "", val);
 			} else if (json_streq(map, field, "PerPkg")) {
-				addfield(map, &perpkg, "", "", val);
+				addfield(map, &je.perpkg, "", "", val);
 			} else if (json_streq(map, field, "Deprecated")) {
-				addfield(map, &deprecated, "", "", val);
+				addfield(map, &je.deprecated, "", "", val);
 			} else if (json_streq(map, field, "MetricName")) {
-				addfield(map, &metric_name, "", "", val);
+				addfield(map, &je.metric_name, "", "", val);
 			} else if (json_streq(map, field, "MetricGroup")) {
-				addfield(map, &metric_group, "", "", val);
+				addfield(map, &je.metric_group, "", "", val);
 			} else if (json_streq(map, field, "MetricConstraint")) {
-				addfield(map, &metric_constraint, "", "", val);
+				addfield(map, &je.metric_constraint, "", "", val);
 			} else if (json_streq(map, field, "MetricExpr")) {
-				addfield(map, &metric_expr, "", "", val);
-				for (s = metric_expr; *s; s++)
+				addfield(map, &je.metric_expr, "", "", val);
+				for (s = je.metric_expr; *s; s++)
 					*s = tolower(*s);
 			} else if (json_streq(map, field, "ArchStdEvent")) {
 				addfield(map, &arch_std, "", "", val);
@@ -645,7 +632,7 @@ static int json_events(const char *fn,
 			}
 			/* ignore unknown fields */
 		}
-		if (precise && desc && !strstr(desc, "(Precise Event)")) {
+		if (precise && je.desc && !strstr(je.desc, "(Precise Event)")) {
 			if (json_streq(map, precise, "2"))
 				addfield(map, &extra_desc, " ",
 						"(Must be precise)", NULL);
@@ -655,48 +642,43 @@ static int json_events(const char *fn,
 		}
 		snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 		addfield(map, &event, ",", buf, NULL);
-		if (desc && extra_desc)
-			addfield(map, &desc, " ", extra_desc, NULL);
-		if (long_desc && extra_desc)
-			addfield(map, &long_desc, " ", extra_desc, NULL);
+		if (je.desc && extra_desc)
+			addfield(map, &je.desc, " ", extra_desc, NULL);
+		if (je.long_desc && extra_desc)
+			addfield(map, &je.long_desc, " ", extra_desc, NULL);
 		if (filter)
 			addfield(map, &event, ",", filter, NULL);
 		if (msr != NULL)
 			addfield(map, &event, ",", msr->pname, msrval);
-		if (name)
-			fixname(name);
+		if (je.name)
+			fixname(je.name);
 
 		if (arch_std) {
 			/*
 			 * An arch standard event is referenced, so try to
 			 * fixup any unassigned values.
 			 */
-			err = try_fixup(fn, arch_std, &event, &desc, &name,
-					&long_desc, &pmu, &filter, &perpkg,
-					&unit, &metric_expr, &metric_name,
-					&metric_group, eventcode,
-					&deprecated, &metric_constraint);
+			err = try_fixup(fn, arch_std, eventcode, &je);
 			if (err)
 				goto free_strings;
 		}
-		err = func(data, name, real_event(name, event), desc, long_desc,
-			   pmu, unit, perpkg, metric_expr, metric_name,
-			   metric_group, deprecated, metric_constraint);
+		je.event = real_event(je.name, event);
+		err = func(data, &je);
 free_strings:
 		free(event);
-		free(desc);
-		free(name);
-		free(long_desc);
+		free(je.desc);
+		free(je.name);
+		free(je.long_desc);
 		free(extra_desc);
-		free(pmu);
+		free(je.pmu);
 		free(filter);
-		free(perpkg);
-		free(deprecated);
-		free(unit);
-		free(metric_expr);
-		free(metric_name);
-		free(metric_group);
-		free(metric_constraint);
+		free(je.perpkg);
+		free(je.deprecated);
+		free(je.unit);
+		free(je.metric_expr);
+		free(je.metric_name);
+		free(je.metric_group);
+		free(je.metric_constraint);
 		free(arch_std);
 
 		if (err)
-- 
2.26.2

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