perf mem: Clean up perf_mem_event__supported()

For some ARCHs, e.g., ARM and AMD, to get the availability of the
mem-events, perf checks the existence of a specific PMU. For the other
ARCHs, e.g., Intel and Power, perf has to check the existence of some
specific events.

The current perf only iterates the mem-events-supported PMUs. It's not
required to check the existence of a specific PMU anymore.

Rename sysfs_name to event_name, which stores the specific mem-events.
Perf only needs to check those events for the availability of the
mem-events.

Rename perf_mem_event__supported to perf_pmu__mem_events_supported.
Reviewed-by: Ian Rogers <irogers@google.com>
Tested-by: Ravi Bangoria <ravi.bangoria@amd.com>
Tested-by: Leo Yan <leo.yan@linaro.org>
Signed-off-by: Kan Liang <kan.liang@linux.intel.com>
Cc: james.clark@arm.com
Cc: will@kernel.org
Cc: mike.leach@linaro.org
Cc: renyu.zj@linux.alibaba.com
Cc: yuhaixin.yhx@linux.alibaba.com
Cc: tmricht@linux.ibm.com
Cc: atrajeev@linux.vnet.ibm.com
Cc: linux-arm-kernel@lists.infradead.org
Cc: john.g.garry@oracle.com
Link: https://lore.kernel.org/r/20240123185036.3461837-5-kan.liang@linux.intel.comSigned-off-by: Namhyung Kim <namhyung@kernel.org>

tools/perf/arch/arm64/util/mem-events.c

@@ -3,10 +3,10 @@
 #include "util/mem-events.h"
 #include "mem-events.h"
 
-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }
 
 struct perf_mem_event perf_mem_events_arm[PERF_MEM_EVENTS__MAX] = {
-	E("spe-load",	"%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=0,min_latency=%u/",	"arm_spe_0",	true,	0),
-	E("spe-store",	"%s/ts_enable=1,pa_enable=1,load_filter=0,store_filter=1/",			"arm_spe_0",	false,	0),
-	E("spe-ldst",	"%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=%u/",	"arm_spe_0",	true,	0),
+	E("spe-load",	"%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=0,min_latency=%u/",	NULL,	true,	0),
+	E("spe-store",	"%s/ts_enable=1,pa_enable=1,load_filter=0,store_filter=1/",			NULL,	false,	0),
+	E("spe-ldst",	"%s/ts_enable=1,pa_enable=1,load_filter=1,store_filter=1,min_latency=%u/",	NULL,	true,	0),
 };

tools/perf/arch/powerpc/util/mem-events.c

@@ -3,10 +3,10 @@
 #include "util/mem-events.h"
 #include "mem-events.h"
 
-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }
 
 struct perf_mem_event perf_mem_events_power[PERF_MEM_EVENTS__MAX] = {
-	E("ldlat-loads",	"%s/mem-loads/",	"cpu/events/mem-loads",		false,	0),
-	E("ldlat-stores",	"%s/mem-stores/",	"cpu/events/mem-stores",	false,	0),
+	E("ldlat-loads",	"%s/mem-loads/",	"mem-loads",	false,	0),
+	E("ldlat-stores",	"%s/mem-stores/",	"mem-stores",	false,	0),
 	E(NULL,			NULL,			NULL,		false,	0),
 };

tools/perf/arch/x86/util/mem-events.c

@@ -9,24 +9,24 @@
 
 #define MEM_LOADS_AUX		0x8203
 
-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }
 
 struct perf_mem_event perf_mem_events_intel[PERF_MEM_EVENTS__MAX] = {
-	E("ldlat-loads",	"%s/mem-loads,ldlat=%u/P",	"%s/events/mem-loads",	true,	0),
-	E("ldlat-stores",	"%s/mem-stores/P",		"%s/events/mem-stores",	false,	0),
+	E("ldlat-loads",	"%s/mem-loads,ldlat=%u/P",	"mem-loads",	true,	0),
+	E("ldlat-stores",	"%s/mem-stores/P",		"mem-stores",	false,	0),
 	E(NULL,			NULL,				NULL,		false,	0),
 };
 
 struct perf_mem_event perf_mem_events_intel_aux[PERF_MEM_EVENTS__MAX] = {
-	E("ldlat-loads",	"{%s/mem-loads-aux/,%s/mem-loads,ldlat=%u/}:P",	"%s/events/mem-loads",	true,	MEM_LOADS_AUX),
-	E("ldlat-stores",	"%s/mem-stores/P",		"%s/events/mem-stores",	false,	0),
+	E("ldlat-loads",	"{%s/mem-loads-aux/,%s/mem-loads,ldlat=%u/}:P",	"mem-loads",	true,	MEM_LOADS_AUX),
+	E("ldlat-stores",	"%s/mem-stores/P",		"mem-stores",	false,	0),
 	E(NULL,			NULL,				NULL,		false,	0),
 };
 
 struct perf_mem_event perf_mem_events_amd[PERF_MEM_EVENTS__MAX] = {
 	E(NULL,		NULL,		NULL,	false,	0),
 	E(NULL,		NULL,		NULL,	false,	0),
-	E("mem-ldst",	"%s//",		"ibs_op",	false,	0),
+	E("mem-ldst",	"%s//",		NULL,	false,	0),
 };
 
 bool is_mem_loads_aux_event(struct evsel *leader)

tools/perf/util/mem-events.c

@@ -17,11 +17,11 @@
 
 unsigned int perf_mem_events__loads_ldlat = 30;
 
-#define E(t, n, s, l, a) { .tag = t, .name = n, .sysfs_name = s, .ldlat = l, .aux_event = a }
+#define E(t, n, s, l, a) { .tag = t, .name = n, .event_name = s, .ldlat = l, .aux_event = a }
 
 struct perf_mem_event perf_mem_events[PERF_MEM_EVENTS__MAX] = {
-	E("ldlat-loads",	"%s/mem-loads,ldlat=%u/P",	"cpu/events/mem-loads",		true,	0),
-	E("ldlat-stores",	"%s/mem-stores/P",		"cpu/events/mem-stores",	false,	0),
+	E("ldlat-loads",	"%s/mem-loads,ldlat=%u/P",	"mem-loads",	true,	0),
+	E("ldlat-stores",	"%s/mem-stores/P",		"mem-stores",	false,	0),
 	E(NULL,			NULL,				NULL,		false,	0),
 };
 #undef E
@@ -151,15 +151,17 @@ int perf_pmu__mem_events_parse(struct perf_pmu *pmu, const char *str)
 	return -1;
 }
 
-static bool perf_mem_event__supported(const char *mnt, struct perf_pmu *pmu,
+static bool perf_pmu__mem_events_supported(const char *mnt, struct perf_pmu *pmu,
 				      struct perf_mem_event *e)
 {
-	char sysfs_name[100];
 	char path[PATH_MAX];
 	struct stat st;
 
-	scnprintf(sysfs_name, sizeof(sysfs_name), e->sysfs_name, pmu->name);
-	scnprintf(path, PATH_MAX, "%s/devices/%s", mnt, sysfs_name);
+	if (!e->event_name)
+		return true;
+
+	scnprintf(path, PATH_MAX, "%s/devices/%s/events/%s", mnt, pmu->name, e->event_name);
+
 	return !stat(path, &st);
 }
 
@@ -182,7 +184,7 @@ int perf_pmu__mem_events_init(struct perf_pmu *pmu)
 		if (!e->tag)
 			continue;
 
-		e->supported |= perf_mem_event__supported(mnt, pmu, e);
+		e->supported |= perf_pmu__mem_events_supported(mnt, pmu, e);
 		if (e->supported)
 			found = true;
 	}
@@ -234,7 +236,7 @@ int perf_mem_events__record_args(const char **rec_argv, int *argv_nr,
 			} else {
 				const char *s = perf_pmu__mem_events_name(j, pmu);
 
-				if (!perf_mem_event__supported(mnt, pmu, e))
+				if (!perf_pmu__mem_events_supported(mnt, pmu, e))
 					continue;
 
 				rec_argv[i++] = "-e";

tools/perf/util/mem-events.h

@@ -18,7 +18,7 @@ struct perf_mem_event {
 	u32		aux_event;
 	const char	*tag;
 	const char	*name;
-	const char	*sysfs_name;
+	const char	*event_name;
 };
 
 struct mem_info {