perf pmus: Split pmus list into core and other

Split the pmus list into core and other. This will later allow for
the core and other pmus to be populated separately.

Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
Signed-off-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Ali Saidi <alisaidi@amazon.com>
Cc: Athira Rajeev <atrajeev@linux.vnet.ibm.com>
Cc: Dmitrii Dolgov <9erthalion6@gmail.com>
Cc: Huacai Chen <chenhuacai@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jing Zhang <renyu.zj@linux.alibaba.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.g.garry@oracle.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Kang Minchul <tegongkang@gmail.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Madhavan Srinivasan <maddy@linux.ibm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Ming Wang <wangming01@loongson.cn>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Ravi Bangoria <ravi.bangoria@amd.com>
Cc: Rob Herring <robh@kernel.org>
Cc: Sandipan Das <sandipan.das@amd.com>
Cc: Sean Christopherson <seanjc@google.com>
Cc: Suzuki Poulouse <suzuki.poulose@arm.com>
Cc: Thomas Richter <tmricht@linux.ibm.com>
Cc: Will Deacon <will@kernel.org>
Cc: Xing Zhengjun <zhengjun.xing@linux.intel.com>
Cc: coresight@lists.linaro.org
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20230527072210.2900565-29-irogers@google.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/util/pmus.c

@@ -12,13 +12,19 @@
 #include "pmu.h"
 #include "print-events.h"
 
-static LIST_HEAD(pmus);
+static LIST_HEAD(core_pmus);
+static LIST_HEAD(other_pmus);
 
 void perf_pmus__destroy(void)
 {
 	struct perf_pmu *pmu, *tmp;
 
-	list_for_each_entry_safe(pmu, tmp, &pmus, list) {
+	list_for_each_entry_safe(pmu, tmp, &core_pmus, list) {
+		list_del(&pmu->list);
+
+		perf_pmu__delete(pmu);
+	}
+	list_for_each_entry_safe(pmu, tmp, &other_pmus, list) {
 		list_del(&pmu->list);
 
 		perf_pmu__delete(pmu);
@@ -29,7 +35,12 @@ static struct perf_pmu *pmu_find(const char *name)
 {
 	struct perf_pmu *pmu;
 
-	list_for_each_entry(pmu, &pmus, list) {
+	list_for_each_entry(pmu, &core_pmus, list) {
+		if (!strcmp(pmu->name, name) ||
+		    (pmu->alias_name && !strcmp(pmu->alias_name, name)))
+			return pmu;
+	}
+	list_for_each_entry(pmu, &other_pmus, list) {
 		if (!strcmp(pmu->name, name) ||
 		    (pmu->alias_name && !strcmp(pmu->alias_name, name)))
 			return pmu;
@@ -53,7 +64,7 @@ struct perf_pmu *perf_pmus__find(const char *name)
 		return pmu;
 
 	dirfd = perf_pmu__event_source_devices_fd();
-	pmu = perf_pmu__lookup(&pmus, dirfd, name);
+	pmu = perf_pmu__lookup(is_pmu_core(name) ? &core_pmus : &other_pmus, dirfd, name);
 	close(dirfd);
 
 	return pmu;
@@ -72,7 +83,7 @@ static struct perf_pmu *perf_pmu__find2(int dirfd, const char *name)
 	if (pmu)
 		return pmu;
 
-	return perf_pmu__lookup(&pmus, dirfd, name);
+	return perf_pmu__lookup(is_pmu_core(name) ? &core_pmus : &other_pmus, dirfd, name);
 }
 
 /* Add all pmus in sysfs to pmu list: */
@@ -93,7 +104,7 @@ static void pmu_read_sysfs(void)
 	while ((dent = readdir(dir))) {
 		if (!strcmp(dent->d_name, ".") || !strcmp(dent->d_name, ".."))
 			continue;
-		/* add to static LIST_HEAD(pmus): */
+		/* add to static LIST_HEAD(core_pmus) or LIST_HEAD(other_pmus): */
 		perf_pmu__find2(fd, dent->d_name);
 	}
 
@@ -104,24 +115,37 @@ struct perf_pmu *perf_pmus__find_by_type(unsigned int type)
 {
 	struct perf_pmu *pmu;
 
-	list_for_each_entry(pmu, &pmus, list)
+	list_for_each_entry(pmu, &core_pmus, list) {
 		if (pmu->type == type)
 			return pmu;
-
+	}
+	list_for_each_entry(pmu, &other_pmus, list) {
+		if (pmu->type == type)
+			return pmu;
+	}
 	return NULL;
 }
 
+/*
+ * pmu iterator: If pmu is NULL, we start at the begin, otherwise return the
+ * next pmu. Returns NULL on end.
+ */
 struct perf_pmu *perf_pmus__scan(struct perf_pmu *pmu)
 {
-	/*
-	 * pmu iterator: If pmu is NULL, we start at the begin,
-	 * otherwise return the next pmu. Returns NULL on end.
-	 */
+	bool use_core_pmus = !pmu || pmu->is_core;
+
 	if (!pmu) {
 		pmu_read_sysfs();
-		pmu = list_prepare_entry(pmu, &pmus, list);
+		pmu = list_prepare_entry(pmu, &core_pmus, list);
 	}
-	list_for_each_entry_continue(pmu, &pmus, list)
+	if (use_core_pmus) {
+		list_for_each_entry_continue(pmu, &core_pmus, list)
+			return pmu;
+
+		pmu = NULL;
+		pmu = list_prepare_entry(pmu, &other_pmus, list);
+	}
+	list_for_each_entry_continue(pmu, &other_pmus, list)
 		return pmu;
 	return NULL;
 }