linux-kernel - [PATCH 2/5] perf jevents: Support ConfigCode

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Message-ID: <1631795665-240946-3-git-send-email-john.garry@huawei.com>
Date:   Thu, 16 Sep 2021 20:34:22 +0800
From:   John Garry <john.garry@...wei.com>
To:     <will@...nel.org>, <mathieu.poirier@...aro.org>,
        <leo.yan@...aro.org>, <peterz@...radead.org>, <mingo@...hat.com>,
        <acme@...nel.org>, <mark.rutland@....com>,
        <alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
        <namhyung@...nel.org>
CC:     <irogers@...gle.com>, <linux-arm-kernel@...ts.infradead.org>,
        <linux-perf-users@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linuxarm@...wei.com>, <zhangshaokun@...ilicon.com>,
        <liuqi115@...wei.com>, John Garry <john.garry@...wei.com>
Subject: [PATCH 2/5] perf jevents: Support ConfigCode

Some PMUs use "config=XXX" for eventcodes, like:

more /sys/bus/event_source/devices/hisi_sccl1_ddrc3/events/act_cmd
config=0x5

However jevents would give an alias with .event field "event=0x5" for this
event. This is handled without issue by the parse events code, but the pmu
alias code gets a bit confused, as it warns about assigning "event=0x5"
over "config=0x5" in perf_pmu_assign_str() when merging aliases:
./perf stat -v -e act_cmd
...
alias act_cmd differs in field 'value'
...

To make things a bit more straightforward, allow jevents to support
"config=XXX" as well, by supporting a "ConfigCode" field.

Signed-off-by: John Garry <john.garry@...wei.com>
---
 tools/perf/pmu-events/jevents.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/tools/perf/pmu-events/jevents.c b/tools/perf/pmu-events/jevents.c
index 6731b3cf0c2f..ef92c2fdd45d 100644
--- a/tools/perf/pmu-events/jevents.c
+++ b/tools/perf/pmu-events/jevents.c
@@ -575,10 +575,12 @@ static int json_events(const char *fn,
 		struct json_event je = {};
 		char *arch_std = NULL;
 		unsigned long long eventcode = 0;
+		unsigned long long configcode = 0;
 		struct msrmap *msr = NULL;
 		jsmntok_t *msrval = NULL;
 		jsmntok_t *precise = NULL;
 		jsmntok_t *obj = tok++;
+		bool configcode_present = false;
 
 		EXPECT(obj->type == JSMN_OBJECT, obj, "expected object");
 		for (j = 0; j < obj->size; j += 2) {
@@ -601,6 +603,12 @@ static int json_events(const char *fn,
 				addfield(map, &code, "", "", val);
 				eventcode |= strtoul(code, NULL, 0);
 				free(code);
+			} else if (json_streq(map, field, "ConfigCode")) {
+				char *code = NULL;
+				addfield(map, &code, "", "", val);
+				configcode |= strtoul(code, NULL, 0);
+				free(code);
+				configcode_present = true;
 			} else if (json_streq(map, field, "ExtSel")) {
 				char *code = NULL;
 				addfield(map, &code, "", "", val);
@@ -682,7 +690,10 @@ static int json_events(const char *fn,
 				addfield(map, &extra_desc, " ",
 						"(Precise event)", NULL);
 		}
-		snprintf(buf, sizeof buf, "event=%#llx", eventcode);
+		if (configcode_present)
+			snprintf(buf, sizeof buf, "config=%#llx", configcode);
+		else
+			snprintf(buf, sizeof buf, "event=%#llx", eventcode);
 		addfield(map, &event, ",", buf, NULL);
 		if (je.desc && extra_desc)
 			addfield(map, &je.desc, " ", extra_desc, NULL);
-- 
2.26.2