linux-kernel - [PATCH 3/8] perf/x86/uncore: Retrieve the unit ID from the unit control RB tree

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Message-Id: <20240610201619.884021-4-kan.liang@linux.intel.com>
Date: Mon, 10 Jun 2024 13:16:14 -0700
From: kan.liang@...ux.intel.com
To: peterz@...radead.org,
	mingo@...nel.org,
	linux-kernel@...r.kernel.org
Cc: acme@...nel.org,
	namhyung@...nel.org,
	irogers@...gle.com,
	eranian@...gle.com,
	ak@...ux.intel.com,
	yunying.sun@...el.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH 3/8] perf/x86/uncore: Retrieve the unit ID from the unit control RB tree

From: Kan Liang <kan.liang@...ux.intel.com>

The box_ids only save the unit ID for the first die. If a unit, e.g., a
CXL unit, doesn't exist in the first die. The unit ID cannot be
retrieved.

The unit control RB tree also stores the unit ID information.
Retrieve the unit ID from the unit control RB tree

Tested-by: Yunying Sun <yunying.sun@...el.com>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/uncore.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/events/intel/uncore.c b/arch/x86/events/intel/uncore.c
index 075c92e0e4bc..27a0cda5cc91 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -863,6 +863,9 @@ static const struct attribute_group uncore_pmu_attr_group = {
 static inline int uncore_get_box_id(struct intel_uncore_type *type,
 				    struct intel_uncore_pmu *pmu)
 {
+	if (type->boxes)
+		return intel_uncore_find_discovery_unit_id(type->boxes, -1, pmu->pmu_idx);
+
 	return type->box_ids ? type->box_ids[pmu->pmu_idx] : pmu->pmu_idx;
 }
 
-- 
2.35.1