linux-kernel - [PATCH v8 05/21] drivers/perf: apple_m1: Support configuring counters for 32-bit EL0

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Message-Id: <20250811-apple-cpmu-v8-5-c560ebd9ca46@gmail.com>
Date: Mon, 11 Aug 2025 21:54:37 +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 05/21] drivers/perf: apple_m1: Support configuring
 counters for 32-bit EL0

Add support for configuring counters for 32-bit EL0 to allow adding support
for implementations with 32-bit EL0.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 arch/arm64/include/asm/apple_m1_pmu.h | 2 ++
 drivers/perf/apple_m1_cpu_pmu.c       | 6 ++++++
 2 files changed, 8 insertions(+)

diff --git a/arch/arm64/include/asm/apple_m1_pmu.h b/arch/arm64/include/asm/apple_m1_pmu.h
index 02e05d05851f739b985bf416f1aa3baeafd691dc..8a667e7f07a517419c22a4f930947347be8546f7 100644
--- a/arch/arm64/include/asm/apple_m1_pmu.h
+++ b/arch/arm64/include/asm/apple_m1_pmu.h
@@ -38,8 +38,10 @@
 
 #define SYS_IMP_APL_PMCR1_EL1	sys_reg(3, 1, 15, 1, 0)
 #define SYS_IMP_APL_PMCR1_EL12	sys_reg(3, 1, 15, 7, 2)
+#define PMCR1_COUNT_A32_EL0_0_7	GENMASK(7, 0)
 #define PMCR1_COUNT_A64_EL0_0_7	GENMASK(15, 8)
 #define PMCR1_COUNT_A64_EL1_0_7	GENMASK(23, 16)
+#define PMCR1_COUNT_A32_EL0_8_9	GENMASK(33, 32)
 #define PMCR1_COUNT_A64_EL0_8_9	GENMASK(41, 40)
 #define PMCR1_COUNT_A64_EL1_8_9	GENMASK(49, 48)
 
diff --git a/drivers/perf/apple_m1_cpu_pmu.c b/drivers/perf/apple_m1_cpu_pmu.c
index b5fe04ef186f04b4af32524fe433afb79979b791..fb2759069fe9e47146f0342fa46e40f3ab836926 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -348,10 +348,16 @@ static void __m1_pmu_configure_event_filter(unsigned int index, bool user,
 	case 0 ... 7:
 		user_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL0_0_7));
 		kernel_bit = BIT(get_bit_offset(index, PMCR1_COUNT_A64_EL1_0_7));
+
+		if (system_supports_32bit_el0())
+			user_bit |= BIT(get_bit_offset(index, PMCR1_COUNT_A32_EL0_0_7));
 		break;
 	case 8 ... 9:
 		user_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL0_8_9));
 		kernel_bit = BIT(get_bit_offset(index - 8, PMCR1_COUNT_A64_EL1_8_9));
+
+		if (system_supports_32bit_el0())
+			user_bit |= BIT(get_bit_offset(index - 8, PMCR1_COUNT_A32_EL0_8_9));
 		break;
 	default:
 		BUG();

-- 
2.50.1