[PATCH v8 05/21] drivers/perf: apple_m1: Support configuring counters for 32-bit EL0
From: Nick Chan <hidden>
Date: 2025-08-11 13:55:44
Also in:
asahi, linux-devicetree, linux-perf-users, lkml
Subsystem:
arm pmu profiling and debugging, arm64 port (aarch64 architecture), the rest · Maintainers:
Will Deacon, Mark Rutland, Catalin Marinas, Linus Torvalds
Add support for configuring counters for 32-bit EL0 to allow adding support for implementations with 32-bit EL0. Signed-off-by: Nick Chan <redacted> --- 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