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Date:   Wed, 11 May 2022 00:01:30 -0700
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Subject: [PATCH 4/7] perf jevents: Modify match field
From:   Ian Rogers <irogers@google.com>
To:     Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        John Garry <john.garry@huawei.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Andi Kleen <ak@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        Felix Fietkau <nbd@nbd.name>, Qi Liu <liuqi115@huawei.com>,
        Like Xu <likexu@tencent.com>, linux-kernel@vger.kernel.org,
        linux-perf-users@vger.kernel.org,
        Nick Forrington <nick.forrington@arm.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        James Clark <james.clark@arm.com>,
        Andrew Kilroy <andrew.kilroy@arm.com>,
        "Paul A . Clarke" <pc@us.ibm.com>, Will Deacon <will@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        ananth.narayan@amd.com, ravi.bangoria@amd.com,
        santosh.shukla@amd.com, sandipan.das@amd.com,
        Caleb Biggers <caleb.biggers@intel.com>,
        Perry Taylor <perry.taylor@intel.com>,
        Kshipra Bopardikar <kshipra.bopardikar@intel.com>
Cc:     Stephane Eranian <eranian@google.com>,
        Ian Rogers <irogers@google.com>
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

The match_field function looks for json values to append to the event
string. As the C code processes these in order the output order matches
that in the json dictionary. Python json readers read the entire
dictionary and lose the ordering. To make the python and C output
comparable makee the C code first read the extra fields then append them
to the event in an order not determined by their order in the file.

Modify the pmu-events test so that test expectations match the new
order.

Signed-off-by: Ian Rogers <irogers@google.com>
---
 tools/perf/pmu-events/jevents.c | 82 ++++++++++++++++++++-------------
 tools/perf/tests/pmu-events.c   | 24 +++++-----
 2 files changed, 62 insertions(+), 44 deletions(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index e1f7c7afd435..cee61c4ed59e 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -207,21 +207,6 @@ static struct msrmap {
 	{ NULL, NULL }
 };
 
-static struct field {
-	const char *field;
-	const char *kernel;
-} fields[] = {
-	{ "UMask",	"umask=" },
-	{ "CounterMask", "cmask=" },
-	{ "Invert",	"inv=" },
-	{ "AnyThread",	"any=" },
-	{ "EdgeDetect",	"edge=" },
-	{ "SampleAfterValue", "period=" },
-	{ "FCMask",	"fc_mask=" },
-	{ "PortMask",	"ch_mask=" },
-	{ NULL, NULL }
-};
-
 static void cut_comma(char *map, jsmntok_t *newval)
 {
 	int i;
@@ -233,21 +218,6 @@ static void cut_comma(char *map, jsmntok_t *newval)
 	}
 }
 
-static int match_field(char *map, jsmntok_t *field, int nz,
-		       char **event, jsmntok_t *val)
-{
-	struct field *f;
-	jsmntok_t newval = *val;
-
-	for (f = fields; f->field; f++)
-		if (json_streq(map, field, f->field) && nz) {
-			cut_comma(map, &newval);
-			addfield(map, event, ",", f->kernel, &newval);
-			return 1;
-		}
-	return 0;
-}
-
 static struct msrmap *lookup_msr(char *map, jsmntok_t *val)
 {
 	jsmntok_t newval = *val;
@@ -581,6 +551,14 @@ static int json_events(const char *fn,
 		jsmntok_t *precise = NULL;
 		jsmntok_t *obj = tok++;
 		bool configcode_present = false;
+		char *umask = NULL;
+		char *cmask = NULL;
+		char *inv = NULL;
+		char *any = NULL;
+		char *edge = NULL;
+		char *period = NULL;
+		char *fc_mask = NULL;
+		char *ch_mask = NULL;
 
 		EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
 		for (j = 0; j < obj->size; j += 2) {
@@ -596,8 +574,23 @@ static int json_events(const char *fn,
 			       "Expected string value");
 
 			nz = !json_streq(map, val, "0");
-			if (match_field(map, field, nz, &event, val)) {
-				/* ok */
+			/* match_field */
+			if (json_streq(map, field, "UMask") && nz) {
+				addfield(map, &umask, "", "umask=", val);
+			} else if (json_streq(map, field, "CounterMask") && nz) {
+				addfield(map, &cmask, "", "cmask=", val);
+			} else if (json_streq(map, field, "Invert") && nz) {
+				addfield(map, &inv, "", "inv=", val);
+			} else if (json_streq(map, field, "AnyThread") && nz) {
+				addfield(map, &any, "", "any=", val);
+			} else if (json_streq(map, field, "EdgeDetect") && nz) {
+				addfield(map, &edge, "", "edge=", val);
+			} else if (json_streq(map, field, "SampleAfterValue") && nz) {
+				addfield(map, &period, "", "period=", val);
+			} else if (json_streq(map, field, "FCMask") && nz) {
+				addfield(map, &fc_mask, "", "fc_mask=", val);
+			} else if (json_streq(map, field, "PortMask") && nz) {
+				addfield(map, &ch_mask, "", "ch_mask=", val);
 			} else if (json_streq(map, field, "EventCode")) {
 				char *code = NULL;
 				addfield(map, &code, "", "", val);
@@ -690,6 +683,23 @@ static int json_events(const char *fn,
 		else
 			snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 		addfield(map, &event, ",", buf, NULL);
+		if (any)
+			addfield(map, &event, ",", any, NULL);
+		if (ch_mask)
+			addfield(map, &event, ",", ch_mask, NULL);
+		if (cmask)
+			addfield(map, &event, ",", cmask, NULL);
+		if (edge)
+			addfield(map, &event, ",", edge, NULL);
+		if (fc_mask)
+			addfield(map, &event, ",", fc_mask, NULL);
+		if (inv)
+			addfield(map, &event, ",", inv, NULL);
+		if (period)
+			addfield(map, &event, ",", period, NULL);
+		if (umask)
+			addfield(map, &event, ",", umask, NULL);
+
 		if (je.desc && extra_desc)
 			addfield(map, &je.desc, " ", extra_desc, NULL);
 		if (je.long_desc && extra_desc)
@@ -718,6 +728,14 @@ static int json_events(const char *fn,
 		je.event = real_event(je.name, event);
 		err = func(data, &je);
 free_strings:
+		free(umask);
+		free(cmask);
+		free(inv);
+		free(any);
+		free(edge);
+		free(period);
+		free(fc_mask);
+		free(ch_mask);
 		free(event);
 		free(je.desc);
 		free(je.name);
diff --git a/tools/perf/tests/pmu-events.c b/tools/perf/tests/pmu-events.c
index b74c6ef59e51..f13368569d8b 100644
--- a/tools/perf/tests/pmu-events.c
+++ b/tools/perf/tests/pmu-events.c
@@ -63,33 +63,33 @@ static const struct perf_pmu_test_event bp_l2_btb_correct = {
 static const struct perf_pmu_test_event segment_reg_loads_any = {
 	.event = {
 		.name = "segment_reg_loads.any",
-		.event = "umask=0x80,period=200000,event=0x6",
+		.event = "event=0x6,period=200000,umask=0x80",
 		.desc = "Number of segment register loads",
 		.topic = "other",
 	},
-	.alias_str = "umask=0x80,period=0x30d40,event=0x6",
+	.alias_str = "event=0x6,period=0x30d40,umask=0x80",
 	.alias_long_desc = "Number of segment register loads",
 };
 
 static const struct perf_pmu_test_event dispatch_blocked_any = {
 	.event = {
 		.name = "dispatch_blocked.any",
-		.event = "umask=0x20,period=200000,event=0x9",
+		.event = "event=0x9,period=200000,umask=0x20",
 		.desc = "Memory cluster signals to block micro-op dispatch for any reason",
 		.topic = "other",
 	},
-	.alias_str = "umask=0x20,period=0x30d40,event=0x9",
+	.alias_str = "event=0x9,period=0x30d40,umask=0x20",
 	.alias_long_desc = "Memory cluster signals to block micro-op dispatch for any reason",
 };
 
 static const struct perf_pmu_test_event eist_trans = {
 	.event = {
 		.name = "eist_trans",
-		.event = "umask=0x0,period=200000,event=0x3a",
+		.event = "event=0x3a,period=200000,umask=0x0",
 		.desc = "Number of Enhanced Intel SpeedStep(R) Technology (EIST) transitions",
 		.topic = "other",
 	},
-	.alias_str = "umask=0,period=0x30d40,event=0x3a",
+	.alias_str = "event=0x3a,period=0x30d40,umask=0",
 	.alias_long_desc = "Number of Enhanced Intel SpeedStep(R) Technology (EIST) transitions",
 };
 
@@ -132,13 +132,13 @@ static const struct perf_pmu_test_event uncore_hisi_ddrc_flux_wcmd = {
 static const struct perf_pmu_test_event unc_cbo_xsnp_response_miss_eviction = {
 	.event = {
 		.name = "unc_cbo_xsnp_response.miss_eviction",
-		.event = "umask=0x81,event=0x22",
+		.event = "event=0x22,umask=0x81",
 		.desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core. Unit: uncore_cbox ",
 		.topic = "uncore",
 		.long_desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core",
 		.pmu = "uncore_cbox",
 	},
-	.alias_str = "umask=0x81,event=0x22",
+	.alias_str = "event=0x22,umask=0x81",
 	.alias_long_desc = "A cross-core snoop resulted from L3 Eviction which misses in some processor core",
 	.matching_pmu = "uncore_cbox_0",
 };
@@ -146,13 +146,13 @@ static const struct perf_pmu_test_event unc_cbo_xsnp_response_miss_eviction = {
 static const struct perf_pmu_test_event uncore_hyphen = {
 	.event = {
 		.name = "event-hyphen",
-		.event = "umask=0x00,event=0xe0",
+		.event = "event=0xe0,umask=0x00",
 		.desc = "UNC_CBO_HYPHEN. Unit: uncore_cbox ",
 		.topic = "uncore",
 		.long_desc = "UNC_CBO_HYPHEN",
 		.pmu = "uncore_cbox",
 	},
-	.alias_str = "umask=0,event=0xe0",
+	.alias_str = "event=0xe0,umask=0",
 	.alias_long_desc = "UNC_CBO_HYPHEN",
 	.matching_pmu = "uncore_cbox_0",
 };
@@ -160,13 +160,13 @@ static const struct perf_pmu_test_event uncore_hyphen = {
 static const struct perf_pmu_test_event uncore_two_hyph = {
 	.event = {
 		.name = "event-two-hyph",
-		.event = "umask=0x00,event=0xc0",
+		.event = "event=0xc0,umask=0x00",
 		.desc = "UNC_CBO_TWO_HYPH. Unit: uncore_cbox ",
 		.topic = "uncore",
 		.long_desc = "UNC_CBO_TWO_HYPH",
 		.pmu = "uncore_cbox",
 	},
-	.alias_str = "umask=0,event=0xc0",
+	.alias_str = "event=0xc0,umask=0",
 	.alias_long_desc = "UNC_CBO_TWO_HYPH",
 	.matching_pmu = "uncore_cbox_0",
 };
-- 
2.36.0.512.ge40c2bad7a-goog