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Mon, 24 Aug 2020 16:47:57 +0000 From: Michael Kelley To: will@kernel.org, ardb@kernel.org, arnd@arndb.de, catalin.marinas@arm.com, mark.rutland@arm.com, maz@kernel.org, linux-arm-kernel@lists.infradead.org, gregkh@linuxfoundation.org, linux-kernel@vger.kernel.org, linux-hyperv@vger.kernel.org, linux-efi@vger.kernel.org, linux-arch@vger.kernel.org, wei.liu@kernel.org, vkuznets@redhat.com, kys@microsoft.com Cc: mikelley@microsoft.com, sunilmut@microsoft.com, boqun.feng@gmail.com Subject: [PATCH v7 05/10] arm64: hyperv: Add interrupt handlers for VMbus and stimer Date: Mon, 24 Aug 2020 09:46:18 -0700 Message-Id: <1598287583-71762-6-git-send-email-mikelley@microsoft.com> X-Mailer: git-send-email 1.8.3.1 In-Reply-To: <1598287583-71762-1-git-send-email-mikelley@microsoft.com> References: <1598287583-71762-1-git-send-email-mikelley@microsoft.com> Content-Type: text/plain X-ClientProxiedBy: CO2PR04CA0145.namprd04.prod.outlook.com (2603:10b6:104::23) To BN8PR21MB1281.namprd21.prod.outlook.com (2603:10b6:408:a2::19) MIME-Version: 1.0 X-MS-Exchange-MessageSentRepresentingType: 1 Received: from 255.255.255.255 (255.255.255.255) by CO2PR04CA0145.namprd04.prod.outlook.com (2603:10b6:104::23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.3305.25 via Frontend Transport; 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This code is architecture dependent and is mostly driven by architecture independent code in the VMbus driver and the Hyper-V timer clocksource driver. This code is built only when CONFIG_HYPERV is enabled. Signed-off-by: Michael Kelley --- arch/arm64/hyperv/Makefile | 2 +- arch/arm64/hyperv/mshyperv.c | 133 ++++++++++++++++++++++++++++++++++++++ arch/arm64/include/asm/mshyperv.h | 70 ++++++++++++++++++++ 3 files changed, 204 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/hyperv/mshyperv.c diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile index 1697d30..87c31c0 100644 --- a/arch/arm64/hyperv/Makefile +++ b/arch/arm64/hyperv/Makefile @@ -1,2 +1,2 @@ # SPDX-License-Identifier: GPL-2.0 -obj-y := hv_core.o +obj-y := hv_core.o mshyperv.o diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c new file mode 100644 index 0000000..be2cd2f --- /dev/null +++ b/arch/arm64/hyperv/mshyperv.c @@ -0,0 +1,133 @@ +// SPDX-License-Identifier: GPL-2.0 + +/* + * Core routines for interacting with Microsoft's Hyper-V hypervisor, + * including setting up VMbus and STIMER interrupts, and handling + * crashes and kexecs. These interactions are through a set of + * static "handler" variables set by the architecture independent + * VMbus and STIMER drivers. + * + * Copyright (C) 2019, Microsoft, Inc. + * + * Author : Michael Kelley + */ + +#include +#include +#include +#include +#include +#include +#include +#include + +static void (*vmbus_handler)(void); +static void (*hv_stimer0_handler)(void); + +static int vmbus_irq; +static long __percpu *vmbus_evt; +static long __percpu *stimer0_evt; + +irqreturn_t hyperv_vector_handler(int irq, void *dev_id) +{ + vmbus_handler(); + return IRQ_HANDLED; +} + +/* Must be done just once */ +int hv_setup_vmbus_irq(int irq, void (*handler)(void)) +{ + int result; + + vmbus_handler = handler; + + vmbus_evt = alloc_percpu(long); + result = request_percpu_irq(irq, hyperv_vector_handler, + "Hyper-V VMbus", vmbus_evt); + if (result) { + pr_err("Can't request Hyper-V VMBus IRQ %d. Error %d", + irq, result); + free_percpu(vmbus_evt); + return result; + } + + vmbus_irq = irq; + return 0; +} +EXPORT_SYMBOL_GPL(hv_setup_vmbus_irq); + +/* Must be done just once */ +void hv_remove_vmbus_irq(void) +{ + if (vmbus_irq) { + free_percpu_irq(vmbus_irq, vmbus_evt); + free_percpu(vmbus_evt); + } +} +EXPORT_SYMBOL_GPL(hv_remove_vmbus_irq); + +/* Must be done by each CPU */ +void hv_enable_vmbus_irq(void) +{ + enable_percpu_irq(vmbus_irq, 0); +} +EXPORT_SYMBOL_GPL(hv_enable_vmbus_irq); + +/* Must be done by each CPU */ +void hv_disable_vmbus_irq(void) +{ + disable_percpu_irq(vmbus_irq); +} +EXPORT_SYMBOL_GPL(hv_disable_vmbus_irq); + +/* Routines to do per-architecture handling of STIMER0 when in Direct Mode */ + +static irqreturn_t hv_stimer0_vector_handler(int irq, void *dev_id) +{ + if (hv_stimer0_handler) + hv_stimer0_handler(); + return IRQ_HANDLED; +} + +int hv_setup_stimer0_irq(int *irq, int *vector, void (*handler)(void)) +{ + int localirq; + int result; + + localirq = acpi_register_gsi(NULL, HV_STIMER0_INTID, + ACPI_EDGE_SENSITIVE, ACPI_ACTIVE_HIGH); + if (localirq <= 0) { + pr_err("Can't register Hyper-V stimer0 GSI. Error %d", + localirq); + *irq = 0; + return -1; + } + stimer0_evt = alloc_percpu(long); + result = request_percpu_irq(localirq, hv_stimer0_vector_handler, + "Hyper-V stimer0", stimer0_evt); + if (result) { + pr_err("Can't request Hyper-V stimer0 IRQ %d. Error %d", + localirq, result); + free_percpu(stimer0_evt); + acpi_unregister_gsi(localirq); + *irq = 0; + return result; + } + + hv_stimer0_handler = handler; + *vector = HV_STIMER0_INTID; + *irq = localirq; + return 0; +} +EXPORT_SYMBOL_GPL(hv_setup_stimer0_irq); + +void hv_remove_stimer0_irq(int irq) +{ + hv_stimer0_handler = NULL; + if (irq) { + free_percpu_irq(irq, stimer0_evt); + free_percpu(stimer0_evt); + acpi_unregister_gsi(irq); + } +} +EXPORT_SYMBOL_GPL(hv_remove_stimer0_irq); diff --git a/arch/arm64/include/asm/mshyperv.h b/arch/arm64/include/asm/mshyperv.h index b17d4a1..2ea64e54 100644 --- a/arch/arm64/include/asm/mshyperv.h +++ b/arch/arm64/include/asm/mshyperv.h @@ -23,6 +23,7 @@ #include #include #include +#include #include #include @@ -80,6 +81,75 @@ static inline void hv_set_synint_state(u32 sint_num, u64 val) (val = hv_get_vpreg(HV_REGISTER_SINT0 + sint_num)) +/* + * Define the INTID used by STIMER0 Direct Mode interrupts. This + * value can't come from ACPI tables because it is needed before + * the Linux ACPI subsystem is initialized. + */ +#define HV_STIMER0_INTID 31 + +/* + * Use the Hyper-V provided stimer0 as the timer that is made + * available to the architecture independent Hyper-V drivers. + */ +static inline void hv_init_timer(u32 timer, u64 tick) +{ + hv_set_vpreg(HV_REGISTER_STIMER0_COUNT + (2*timer), tick); +} + +static inline void hv_init_timer_config(u32 timer, u64 val) +{ + hv_set_vpreg(HV_REGISTER_STIMER0_CONFIG + (2*timer), val); +} + +#define hv_get_time_ref_count(val) \ + (val = hv_get_vpreg(HV_REGISTER_TIME_REFCOUNT)) +#define hv_get_reference_tsc(val) \ + (val = hv_get_vpreg(HV_REGISTER_REFERENCE_TSC)) + +static inline void hv_set_reference_tsc(u64 val) +{ + hv_set_vpreg(HV_REGISTER_REFERENCE_TSC, val); +} + +#define hv_set_clocksource_vdso(val) \ + ((val).vdso_clock_mode = VDSO_CLOCKMODE_NONE) + +static inline void hv_enable_vdso_clocksource(void) {} + +static inline void hv_enable_stimer0_percpu_irq(int irq) +{ + enable_percpu_irq(irq, 0); +} + +static inline void hv_disable_stimer0_percpu_irq(int irq) +{ + disable_percpu_irq(irq); +} + +static inline u64 hv_get_raw_timer(void) +{ + return arch_timer_read_counter(); +} + +static inline void hv_setup_sched_clock(void *sched_clock) +{ + /* + * The Hyper-V sched clock read function returns nanoseconds, + * not the normal 100ns units of the Hyper-V synthetic clock, + * so specify 1 GHz here as the rate. + */ + sched_clock_register(sched_clock, 64, NSEC_PER_SEC); +} + +extern int vmbus_interrupt; + +static inline int hv_get_vector(void) +{ + return vmbus_interrupt; +} + + /* SMCCC hypercall parameters */ #define HV_SMCCC_FUNC_NUMBER 1 #define HV_FUNC_ID ARM_SMCCC_CALL_VAL( \ -- 1.8.3.1