linux-kernel - [PATCH V4 07/25] perf/x86: Hybrid PMU support for unconstrained

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Date:   Thu,  1 Apr 2021 17:10:34 -0700
From:   kan.liang@...ux.intel.com
To:     peterz@...radead.org, mingo@...nel.org,
        linux-kernel@...r.kernel.org
Cc:     acme@...nel.org, tglx@...utronix.de, bp@...en8.de,
        namhyung@...nel.org, jolsa@...hat.com, ak@...ux.intel.com,
        yao.jin@...ux.intel.com, alexander.shishkin@...ux.intel.com,
        adrian.hunter@...el.com, Kan Liang <kan.liang@...ux.intel.com>
Subject: [PATCH V4 07/25] perf/x86: Hybrid PMU support for unconstrained

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

The unconstrained value depends on the number of GP and fixed counters.
Each hybrid PMU should use its own unconstrained.

Suggested-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Signed-off-by: Kan Liang <kan.liang@...ux.intel.com>
---
 arch/x86/events/intel/core.c | 5 ++++-
 arch/x86/events/perf_event.h | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/intel/core.c b/arch/x86/events/intel/core.c
index 33d26ed..39f57ae 100644
--- a/arch/x86/events/intel/core.c
+++ b/arch/x86/events/intel/core.c
@@ -3147,7 +3147,10 @@ x86_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
 		}
 	}
 
-	return &unconstrained;
+	if (!is_hybrid() || !cpuc->pmu)
+		return &unconstrained;
+
+	return &hybrid_pmu(cpuc->pmu)->unconstrained;
 }
 
 static struct event_constraint *
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index 993f0de..cfb2da0 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -639,6 +639,7 @@ struct x86_hybrid_pmu {
 	int				max_pebs_events;
 	int				num_counters;
 	int				num_counters_fixed;
+	struct event_constraint		unconstrained;
 };
 
 static __always_inline struct x86_hybrid_pmu *hybrid_pmu(struct pmu *pmu)
-- 
2.7.4