perf pmu: Tolerate failure to read the type for wellknown PMUs

JIRA: https://issues.redhat.com/browse/RHEL-78198

upstream
========
commit 8c75dc7
Author: Ian Rogers <irogers@google.com>
Date: Thu Jul 10 16:51:17 2025 -0700

description
===========
If sysfs isn't mounted then we may fail to read a PMU's type. In this
situation resort to lookup of wellknown types. Only applies to
software, tracepoint and breakpoint PMUs.

    Signed-off-by: Ian Rogers <irogers@google.com>
    Link: https://lore.kernel.org/r/20250710235126.1086011-5-irogers@google.com
    Signed-off-by: Namhyung Kim <namhyung@kernel.org>

Signed-off-by: Michael Petlan <mpetlan@redhat.com>

Author: rfmvh

tools/perf/util/pmu.c

@@ -1181,6 +1181,32 @@ int perf_pmu__init(struct perf_pmu *pmu, __u32 type, const char *name)
 	return 0;
 }
 
+static __u32 wellknown_pmu_type(const char *pmu_name)
+{
+	struct {
+		const char *pmu_name;
+		__u32 type;
+	} wellknown_pmus[] = {
+		{
+			"software",
+			PERF_TYPE_SOFTWARE
+		},
+		{
+			"tracepoint",
+			PERF_TYPE_TRACEPOINT
+		},
+		{
+			"breakpoint",
+			PERF_TYPE_BREAKPOINT
+		},
+	};
+	for (size_t i = 0; i < ARRAY_SIZE(wellknown_pmus); i++) {
+		if (!strcmp(wellknown_pmus[i].pmu_name, pmu_name))
+			return wellknown_pmus[i].type;
+	}
+	return PERF_TYPE_MAX;
+}
+
 struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char *name,
 				  bool eager_load)
 {
@@ -1200,8 +1226,12 @@ struct perf_pmu *perf_pmu__lookup(struct list_head *pmus, int dirfd, const char
 	 * that type value is successfully assigned (return 1).
 	 */
 	if (perf_pmu__scan_file_at(pmu, dirfd, "type", "%u", &pmu->type) != 1) {
-		perf_pmu__delete(pmu);
-		return NULL;
+		/* Double check the PMU's name isn't wellknown. */
+		pmu->type = wellknown_pmu_type(name);
+		if (pmu->type == PERF_TYPE_MAX) {
+			perf_pmu__delete(pmu);
+			return NULL;
+		}
 	}
 
 	/*