perf x86/topdown: Fix topdown leader sampling test error on hybrid

JIRA: https://issues.redhat.com/browse/RHEL-77936

upstream
========
commit b74683b
Author: Dapeng Mi <[email protected]>
Date: Thu Mar 6 18:39:03 2025 -0800

description
===========
When running topdown leader smapling test on Intel hybrid platforms,
such as LNL/ARL, we see the below error.

Topdown leader sampling test
Topdown leader sampling [Failed topdown events not reordered correctly]

It indciates the below command fails.

perf record -o "${perfdata}" -e "{instructions,slots,topdown-retiring}:S" true

The root cause is that perf tool creats a perf event for each PMU type
if it can create.

As for this command, there would be 5 perf events created,
cpu_atom/instructions/,cpu_atom/topdown_retiring/,
cpu_core/slots/,cpu_core/instructions/,cpu_core/topdown-retiring/

For these 5 events, the 2 cpu_atom events are in a group and the other 3
cpu_core events are in another group.

When arch_topdown_sample_read() traverses all these 5 events, events
cpu_atom/instructions/ and cpu_core/slots/ don't have a same group
leade, and then return false directly and lead to cpu_core/slots/ event
is used to sample and this is not allowed by PMU driver.

It's a overkill to return false directly if "evsel->core.leader !=
 leader->core.leader" since there could be multiple groups in the event
list.

Just "continue" instead of "return false" to fix this issue.

Fixes: 1e53e9d ("perf x86/topdown: Correct leader selection with sample_read enabled")
    Signed-off-by: Dapeng Mi <[email protected]>
    Tested-by: Thomas Falcon <[email protected]>
    Tested-by: Ian Rogers <[email protected]>
    Link: https://lore.kernel.org/r/[email protected]
    Signed-off-by: Namhyung Kim <[email protected]>

Signed-off-by: Michael Petlan <[email protected]>

Author: rfmvh

tools/perf/arch/x86/util/topdown.c

@@ -81,7 +81,7 @@ bool arch_topdown_sample_read(struct evsel *leader)
 	 */
 	evlist__for_each_entry(leader->evlist, evsel) {
 		if (evsel->core.leader != leader->core.leader)
-			return false;
+			continue;
 		if (evsel != leader && arch_is_topdown_metrics(evsel))
 			return true;
 	}