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Date:   Sat, 27 May 2023 00:22:04 -0700
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Subject: [PATCH v5 28/34] perf pmus: Split pmus list into core and other
From:   Ian Rogers <irogers@google.com>
To:     Suzuki K Poulose <suzuki.poulose@arm.com>,
        Mike Leach <mike.leach@linaro.org>,
        Leo Yan <leo.yan@linaro.org>,
        John Garry <john.g.garry@oracle.com>,
        Will Deacon <will@kernel.org>,
        James Clark <james.clark@arm.com>,
        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>,
        Ian Rogers <irogers@google.com>,
        Adrian Hunter <adrian.hunter@intel.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        Jing Zhang <renyu.zj@linux.alibaba.com>,
        Kan Liang <kan.liang@linux.intel.com>,
        Zhengjun Xing <zhengjun.xing@linux.intel.com>,
        Ravi Bangoria <ravi.bangoria@amd.com>,
        Madhavan Srinivasan <maddy@linux.ibm.com>,
        Athira Rajeev <atrajeev@linux.vnet.ibm.com>,
        Ming Wang <wangming01@loongson.cn>,
        Huacai Chen <chenhuacai@kernel.org>,
        Sandipan Das <sandipan.das@amd.com>,
        Dmitrii Dolgov <9erthalion6@gmail.com>,
        Sean Christopherson <seanjc@google.com>,
        Ali Saidi <alisaidi@amazon.com>, Rob Herring <robh@kernel.org>,
        Thomas Richter <tmricht@linux.ibm.com>,
        Kang Minchul <tegongkang@gmail.com>,
        linux-kernel@vger.kernel.org, coresight@lists.linaro.org,
        linux-arm-kernel@lists.infradead.org,
        linux-perf-users@vger.kernel.org
Content-Type: text/plain; charset="UTF-8"
Precedence: bulk

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

Signed-off-by: Ian Rogers <irogers@google.com>
Reviewed-by: Kan Liang <kan.liang@linux.intel.com>
---
 tools/perf/util/pmus.c | 52 ++++++++++++++++++++++++++++++------------
 1 file changed, 38 insertions(+), 14 deletions(-)

diff --git a/tools/perf/util/pmus.c b/tools/perf/util/pmus.c
index 58ff7937e9b7..4ef4fecd335f 100644
--- a/tools/perf/util/pmus.c
+++ b/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);
+	}
+	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, &pmus, list)
+	list_for_each_entry_continue(pmu, &other_pmus, list)
 		return pmu;
 	return NULL;
 }
-- 
2.41.0.rc0.172.g3f132b7071-goog