linux-kernel - [PATCH 04/10] drivers/perf: apple_m1: Support configuring counters for 32-bit EL0

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Message-Id: <20250212-apple-cpmu-v1-4-f8c7f2ac1743@gmail.com>
Date: Wed, 12 Feb 2025 00:07:25 +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>
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 04/10] 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.

For documentation purposes, also add the bitmask for configuring counters
for 64-bit EL3.

Signed-off-by: Nick Chan <towinchenmi@...il.com>
---
 arch/arm64/include/asm/apple_m1_pmu.h | 2 ++
 drivers/perf/apple_m1_cpu_pmu.c       | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/arch/arm64/include/asm/apple_m1_pmu.h b/arch/arm64/include/asm/apple_m1_pmu.h
index 99483b19b99fca38483faad443ad4bcf4b85ef63..835d602a9a33fc812982839799c0bbabef656078 100644
--- a/arch/arm64/include/asm/apple_m1_pmu.h
+++ b/arch/arm64/include/asm/apple_m1_pmu.h
@@ -37,8 +37,10 @@
 #define PMCR0_PMI_ENABLE_8_9	GENMASK(45, 44)
 
 #define SYS_IMP_APL_PMCR1_EL1	sys_reg(3, 1, 15, 1, 0)
+#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_A64_EL3_0_7	GENMASK(31, 24)
 #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 ae91848bcd828be197fc21bb2195f3e2460edc65..06ae20332e79f7dfa819f764a3752fefe53bf5b8 100644
--- a/drivers/perf/apple_m1_cpu_pmu.c
+++ b/drivers/perf/apple_m1_cpu_pmu.c
@@ -335,6 +335,9 @@ static void m1_pmu_configure_counter(unsigned int index, u8 event,
 	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));

-- 
2.48.1