linux-kernel - [PATCH V2 3/8] perf/x86/uncore: Retrieve the unit ID from the unit control RB tree

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Message-Id: <20240614134631.1092359-4-kan.liang@linux.intel.com>
Date: Fri, 14 Jun 2024 06:46:26 -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,
	tim.c.chen@...ux.intel.com,
	Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V2 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 c2d877d20e31..3ad23527833a 100644
--- a/arch/x86/events/intel/uncore.c
+++ b/arch/x86/events/intel/uncore.c
@@ -862,6 +862,9 @@ 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