[PATCH v2 1/9] perf/cxl: Program the requested event group on configurable counters

cxl_pmu_get_event_idx() sets *counter_idx for a configurable counter but
never sets *event_idx, so hwc->event_base stays 0 and cxl_pmu_event_start()
programs event group 0 regardless of the group the user requested.

Return the matched capability's event_idx.

Fixes: 5d7107c72796 ("perf: CXL Performance Monitoring Unit driver")
Reported-by: [email protected]
Closes: https://sashiko.dev/#/patchset/[email protected]?part=1
Assisted-by: Claude:claude-opus-4-8
Signed-off-by: Dave Jiang <[email protected]>
---
 drivers/perf/cxl_pmu.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/perf/cxl_pmu.c b/drivers/perf/cxl_pmu.c
index 68a54d97d2a8..e77c0650a7eb 100644
--- a/drivers/perf/cxl_pmu.c
+++ b/drivers/perf/cxl_pmu.c
@@ -552,6 +552,8 @@ static int cxl_pmu_get_event_idx(struct perf_event *event, int *counter_idx,
 			return -EINVAL;
 
 		*counter_idx = i;
+		if (event_idx)
+			*event_idx = pmu_ev->event_idx;
 		return 0;
 	}
 
-- 
2.55.0