From: Michael Kelley <mikelley@microsoft.com>
To: "will@kernel.org" <will@kernel.org>,
"catalin.marinas@arm.com" <catalin.marinas@arm.com>,
"mark.rutland@arm.com" <mark.rutland@arm.com>,
"maz@kernel.org" <maz@kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org>,
"devel@linuxdriverproject.org" <devel@linuxdriverproject.org>,
"olaf@aepfle.de" <olaf@aepfle.de>,
"apw@canonical.com" <apw@canonical.com>,
vkuznets <vkuznets@redhat.com>,
"jasowang@redhat.com" <jasowang@redhat.com>,
"marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com>,
KY Srinivasan <kys@microsoft.com>
Cc: Sunil Muthuswamy <sunilmut@microsoft.com>,
"boqun.feng" <boqun.feng@gmail.com>,
Michael Kelley <mikelley@microsoft.com>
Subject: [PATCH v5 4/8] arm64: hyperv: Add interrupt handlers for VMbus and stimer
Date: Thu, 3 Oct 2019 19:03:21 +0000 [thread overview]
Message-ID: <1570129355-16005-5-git-send-email-mikelley@microsoft.com> (raw)
In-Reply-To: <1570129355-16005-1-git-send-email-mikelley@microsoft.com>
Add ARM64-specific code to set up and handle the interrupts
generated by Hyper-V for VMbus messages and for stimer expiration.
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 <mikelley@microsoft.com>
---
arch/arm64/hyperv/Makefile | 2 +-
arch/arm64/hyperv/mshyperv.c | 139 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 140 insertions(+), 1 deletion(-)
create mode 100644 arch/arm64/hyperv/mshyperv.c
diff --git a/arch/arm64/hyperv/Makefile b/arch/arm64/hyperv/Makefile
index 6bd8439..988eda5 100644
--- a/arch/arm64/hyperv/Makefile
+++ b/arch/arm64/hyperv/Makefile
@@ -1,2 +1,2 @@
# SPDX-License-Identifier: GPL-2.0
-obj-y := hv_init.o hv_hvc.o
+obj-y := hv_init.o hv_hvc.o mshyperv.o
diff --git a/arch/arm64/hyperv/mshyperv.c b/arch/arm64/hyperv/mshyperv.c
new file mode 100644
index 0000000..ae6ece6
--- /dev/null
+++ b/arch/arm64/hyperv/mshyperv.c
@@ -0,0 +1,139 @@
+// 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 <mikelley@microsoft.com>
+ */
+
+#include <linux/types.h>
+#include <linux/export.h>
+#include <linux/interrupt.h>
+#include <linux/kexec.h>
+#include <linux/acpi.h>
+#include <linux/ptrace.h>
+#include <asm/hyperv-tlfs.h>
+#include <asm/mshyperv.h>
+
+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 */
+void hv_setup_vmbus_irq(void (*handler)(void))
+{
+ int result;
+
+ vmbus_handler = handler;
+ vmbus_irq = acpi_register_gsi(NULL, HYPERVISOR_CALLBACK_VECTOR,
+ ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_HIGH);
+ if (vmbus_irq <= 0) {
+ pr_err("Can't register Hyper-V VMBus GSI. Error %d",
+ vmbus_irq);
+ vmbus_irq = 0;
+ return;
+ }
+ vmbus_evt = alloc_percpu(long);
+ result = request_percpu_irq(vmbus_irq, hyperv_vector_handler,
+ "Hyper-V VMbus", vmbus_evt);
+ if (result) {
+ pr_err("Can't request Hyper-V VMBus IRQ %d. Error %d",
+ vmbus_irq, result);
+ free_percpu(vmbus_evt);
+ acpi_unregister_gsi(vmbus_irq);
+ vmbus_irq = 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);
+ acpi_unregister_gsi(vmbus_irq);
+ }
+}
+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_IRQNR,
+ ACPI_LEVEL_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 -1;
+ }
+
+ hv_stimer0_handler = handler;
+ *vector = HV_STIMER0_IRQNR;
+ *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);
--
1.8.3.1
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next prev parent reply other threads:[~2019-10-03 19:04 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-03 19:03 [PATCH v5 0/8] Enable Linux guests on Hyper-V on ARM64 Michael Kelley
2019-10-03 19:03 ` [PATCH v5 1/8] arm64: hyperv: Add core Hyper-V include files Michael Kelley
2019-10-03 19:03 ` [PATCH v5 2/8] arm64: hyperv: Add hypercall and register access functions Michael Kelley
2019-11-04 4:36 ` Boqun Feng
2019-11-06 0:40 ` Michael Kelley
2019-11-06 10:19 ` Marc Zyngier
2019-11-06 17:59 ` Michael Kelley
2019-11-07 9:10 ` Marc Zyngier
2019-11-11 17:16 ` Michael Kelley
2019-10-03 19:03 ` [PATCH v5 3/8] arm64: hyperv: Add memory alloc/free functions for Hyper-V size pages Michael Kelley
2019-11-07 14:19 ` Marc Zyngier
2019-11-08 19:00 ` Michael Kelley
2019-10-03 19:03 ` Michael Kelley [this message]
2019-10-03 19:03 ` [PATCH v5 5/8] arm64: hyperv: Add kexec and panic handlers Michael Kelley
2019-10-03 19:03 ` [PATCH v5 6/8] arm64: hyperv: Initialize hypervisor on boot Michael Kelley
2019-10-03 19:03 ` [PATCH v5 7/8] Drivers: hv: vmbus: Add hooks for per-CPU IRQ Michael Kelley
2019-10-03 19:03 ` [PATCH v5 8/8] Drivers: hv: Enable Hyper-V code to be built on ARM64 Michael Kelley
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