From mboxrd@z Thu Jan 1 00:00:00 1970 From: jeremy.linton@arm.com (Jeremy Linton) Date: Tue, 23 Aug 2016 15:47:56 -0500 Subject: [PATCH v7 5/9] arm64: pmu: Add support for probing with ACPI In-Reply-To: <1471985280-2243-1-git-send-email-jeremy.linton@arm.com> References: <1471985280-2243-1-git-send-email-jeremy.linton@arm.com> Message-ID: <1471985280-2243-6-git-send-email-jeremy.linton@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Mark Salter In the case of ACPI, the PMU IRQ information is contained in the MADT table. Also, since the PMU does not exist as a device in the ACPI DSDT table, it is necessary to create a platform device so that the appropriate driver probing is triggered. Signed-off-by: Mark Salter Signed-off-by: Jeremy Linton --- arch/arm64/kernel/smp.c | 5 +++++ drivers/perf/Kconfig | 4 ++++ drivers/perf/Makefile | 1 + drivers/perf/arm_pmu_acpi.c | 51 ++++++++++++++++++++++++++++++++++++++++++++ include/linux/perf/arm_pmu.h | 7 ++++++ 5 files changed, 68 insertions(+) create mode 100644 drivers/perf/arm_pmu_acpi.c diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c index a6552fe..dc333c6 100644 --- a/arch/arm64/kernel/smp.c +++ b/arch/arm64/kernel/smp.c @@ -37,6 +37,7 @@ #include #include #include +#include #include #include @@ -540,6 +541,7 @@ acpi_verify_and_map_madt(struct acpi_madt_generic_interrupt *processor) return; } bootcpu_valid = true; + arm_pmu_parse_acpi(0, processor); return; } @@ -560,6 +562,9 @@ acpi_verify_and_map_madt(struct acpi_madt_generic_interrupt *processor) */ acpi_set_mailbox_entry(cpu_count, processor); + /* get PMU irq info */ + arm_pmu_parse_acpi(cpu_count, processor); + early_map_cpu_to_node(cpu_count, acpi_numa_get_nid(cpu_count, hwid)); cpu_count++; diff --git a/drivers/perf/Kconfig b/drivers/perf/Kconfig index 04e2653..818fa3b 100644 --- a/drivers/perf/Kconfig +++ b/drivers/perf/Kconfig @@ -12,4 +12,8 @@ config ARM_PMU Say y if you want to use CPU performance monitors on ARM-based systems. +config ARM_PMU_ACPI + def_bool y + depends on ARM_PMU && ACPI + endmenu diff --git a/drivers/perf/Makefile b/drivers/perf/Makefile index acd2397..fd8090d 100644 --- a/drivers/perf/Makefile +++ b/drivers/perf/Makefile @@ -1 +1,2 @@ obj-$(CONFIG_ARM_PMU) += arm_pmu.o +obj-$(CONFIG_ARM_PMU_ACPI) += arm_pmu_acpi.o diff --git a/drivers/perf/arm_pmu_acpi.c b/drivers/perf/arm_pmu_acpi.c new file mode 100644 index 0000000..e784714 --- /dev/null +++ b/drivers/perf/arm_pmu_acpi.c @@ -0,0 +1,51 @@ +/* + * ARM ACPI PMU support + * + * Copyright (C) 2015 Red Hat Inc. + * Author: Mark Salter + * + * This work is licensed under the terms of the GNU GPL, version 2. See + * the COPYING file in the top-level directory. + * + */ + +#include +#include +#include +#include +#include +#include +#include + +struct pmu_irq { + int gsi; + int trigger; + bool registered; +}; + +static struct pmu_irq pmu_irqs[NR_CPUS] __initdata; + +/* + * Called from acpi_map_gic_cpu_interface()'s MADT parsing during boot. + * This routine saves off the GSI's and their trigger state for use when we are + * ready to build the PMU platform device. +*/ +void __init arm_pmu_parse_acpi(int cpu, struct acpi_madt_generic_interrupt *gic) +{ + pmu_irqs[cpu].gsi = gic->performance_interrupt; + if (gic->flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) + pmu_irqs[cpu].trigger = ACPI_EDGE_SENSITIVE; + else + pmu_irqs[cpu].trigger = ACPI_LEVEL_SENSITIVE; +} + +static int __init pmu_acpi_init(void) +{ + int err = -ENOMEM; + + if (acpi_disabled) + return 0; + + return err; +} +arch_initcall(pmu_acpi_init); diff --git a/include/linux/perf/arm_pmu.h b/include/linux/perf/arm_pmu.h index ef4b760..012deb7 100644 --- a/include/linux/perf/arm_pmu.h +++ b/include/linux/perf/arm_pmu.h @@ -158,4 +158,11 @@ int arm_pmu_device_probe(struct platform_device *pdev, #endif /* CONFIG_ARM_PMU */ +#ifdef CONFIG_ARM_PMU_ACPI +struct acpi_madt_generic_interrupt; +void arm_pmu_parse_acpi(int cpu, struct acpi_madt_generic_interrupt *gic); +#else +#define arm_pmu_parse_acpi(a, b) do { } while (0) +#endif /* CONFIG_ARM_PMU_ACPI */ + #endif /* __ARM_PMU_H__ */ -- 2.5.5