linux-kernel - [PATCH v8 02/21] drivers/perf: apple_m1: Only init PMUv3 remap when EL2 is available

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Message-Id: <20250811-apple-cpmu-v8-2-c560ebd9ca46@gmail.com>
Date: Mon, 11 Aug 2025 21:54:34 +0800
From: Nick Chan <towinchenmi@...il.com>
To: Will Deacon <will@...nel.org>, Mark Rutland <mark.rutland@....com>, 
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>, 
 Conor Dooley <conor+dt@...nel.org>, 
 Catalin Marinas <catalin.marinas@....com>, Janne Grunau <j@...nau.net>, 
 Alyssa Rosenzweig <alyssa@...enzweig.io>, Neal Gompa <neal@...pa.dev>, 
 Sven Peter <sven@...nel.org>
Cc: Marc Zyngier <maz@...nel.org>, linux-arm-kernel@...ts.infradead.org, 
 linux-perf-users@...r.kernel.org, devicetree@...r.kernel.org, 
 asahi@...ts.linux.dev, linux-kernel@...r.kernel.org, 
 Nick Chan <towinchenmi@...il.com>
Subject: [PATCH v8 02/21] drivers/perf: apple_m1: Only init PMUv3 remap
 when EL2 is available

The events in the Apple A7 PMU is very different from the ones in M1, and
EL2 is not available on Apple A7. Instead of assigning the wrong PMUv3
remap on A7 or declaring a new PMUv3 remap that would never be used in
practice, skip initializing PMUv3 remap altogther when EL2 is unavailable.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 drivers/perf/apple_m1_cpu_pmu.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
index 81b6f1a623499566ef04d04075752f34e2cb6a92..f3948528e28e0189efd0f17fde0d808930d936af 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -645,8 +645,10 @@ static int m1_pmu_init(struct arm_pmu *cpu_pmu, u32 flags)
 	cpu_pmu->reset		  = m1_pmu_reset;
 	cpu_pmu->set_event_filter = m1_pmu_set_event_filter;
 
-	cpu_pmu->map_pmuv3_event  = m1_pmu_map_pmuv3_event;
-	m1_pmu_init_pmceid(cpu_pmu);
+	if (is_hyp_mode_available()) {
+		cpu_pmu->map_pmuv3_event  = m1_pmu_map_pmuv3_event;
+		m1_pmu_init_pmceid(cpu_pmu);
+	}
 
 	bitmap_set(cpu_pmu->cntr_mask, 0, M1_PMU_NR_COUNTERS);
 	cpu_pmu->attr_groups[ARMPMU_ATTR_GROUP_EVENTS] = &m1_pmu_events_attr_group;

-- 
2.50.1