Differential D36467 Diff 112076 sys/dev/hyperv/vmbus/x86/vmbus_x86.c

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sys/dev/hyperv/vmbus/x86/vmbus_x86.c

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				/*- SPDX-License-Identifier: BSD-2-Clause-FreeBSD
				* Copyright (c) 2009-2012,2016-2017, 2022 Microsoft Corp.
				* Copyright (c) 2012 NetApp Inc.
				* Copyright (c) 2012 Citrix Inc.
				* All rights reserved.
				*
				* Redistribution and use in source and binary forms, with or without
				* modification, are permitted provided that the following conditions
				* are met:
				* 1. Redistributions of source code must retain the above copyright
				* notice unmodified, this list of conditions, and the following
				* disclaimer.
				* 2. Redistributions in binary form must reproduce the above copyright
				* notice, this list of conditions and the following disclaimer in the
				* documentation and/or other materials provided with the distribution.
				*
				* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
				* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
				* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
				* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
				* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
				* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
				* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
				* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
				* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
				* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
				*/

				/*
				* VM Bus Driver Implementation
				*/
				#include <sys/cdefs.h>
				__FBSDID("$FreeBSD$");

				#include <sys/param.h>
				#include <sys/bus.h>
				#include <sys/kernel.h>
				#include <sys/linker.h>
				#include <sys/lock.h>
				#include <sys/malloc.h>
				#include <sys/module.h>
				#include <sys/mutex.h>
				#include <sys/sbuf.h>
				#include <sys/smp.h>
				#include <sys/sysctl.h>
				#include <sys/systm.h>
				#include <sys/taskqueue.h>

				#include <vm/vm.h>
				#include <vm/vm_param.h>
				#include <vm/pmap.h>

				#include <machine/bus.h>
				#include <machine/metadata.h>
				#include <machine/md_var.h>
				#include <machine/resource.h>
				#include <machine/intr_machdep.h>
				#include <contrib/dev/acpica/include/acpi.h>
				#include <dev/acpica/acpivar.h>

				#include <dev/hyperv/include/hyperv.h>
				#include <dev/hyperv/include/vmbus_xact.h>
				#include <dev/hyperv/vmbus/hyperv_var.h>
				#include <dev/hyperv/vmbus/vmbus_reg.h>
				#include <dev/hyperv/vmbus/vmbus_var.h>
				#include <dev/hyperv/vmbus/vmbus_chanvar.h>
				#include <x86/include/apicvar.h>
				#include <dev/hyperv/vmbus/x86/hyperv_machdep.h>
				#include <dev/hyperv/vmbus/x86/hyperv_reg.h>
				#include "acpi_if.h"
				#include "pcib_if.h"
				#include "vmbus_if.h"

				extern inthand_t IDTVEC(vmbus_isr), IDTVEC(vmbus_isr_pti);
				#define VMBUS_ISR_ADDR trunc_page((uintptr_t)IDTVEC(vmbus_isr_pti))

				void vmbus_handle_timer_intr1(struct vmbus_message *msg_base,
				struct trapframe *frame);
				void vmbus_synic_setup1(void *xsc);
				void vmbus_synic_teardown1(void);
				int vmbus_setup_intr1(struct vmbus_softc *sc);
				void vmbus_intr_teardown1(struct vmbus_softc *sc);

				void
				vmbus_handle_timer_intr1(struct vmbus_message *msg_base,
				struct trapframe *frame)
				{
				volatile struct vmbus_message *msg;
				msg = msg_base + VMBUS_SINT_TIMER;
				if (msg->msg_type == HYPERV_MSGTYPE_TIMER_EXPIRED) {
				msg->msg_type = HYPERV_MSGTYPE_NONE;
				vmbus_et_intr(frame);
				/*
				* Make sure the write to msg_type (i.e. set to
				* HYPERV_MSGTYPE_NONE) happens before we read the
				* msg_flags and EOMing. Otherwise, the EOMing will
				* not deliver any more messages since there is no
				* empty slot
				*
				* NOTE:
				* mb() is used here, since atomic_thread_fence_seq_cst()
				* will become compiler fence on UP kernel.
				*/
				mb();
				if (msg->msg_flags & VMBUS_MSGFLAG_PENDING) {
				/*
				* This will cause message queue rescan to possibly
				* deliver another msg from the hypervisor
				*/
				wrmsr(MSR_HV_EOM, 0);
				}
				}
				return;
				}

				void
				vmbus_synic_setup1(void *xsc)
				{
				struct vmbus_softc *sc = xsc;
				uint32_t sint;
				uint64_t val, orig;

				sint = MSR_HV_SINT0 + VMBUS_SINT_TIMER;
				orig = RDMSR(sint);
				val = sc->vmbus_idtvec \| MSR_HV_SINT_AUTOEOI \|
				(orig & MSR_HV_SINT_RSVD_MASK);
				WRMSR(sint, val);
				return;
				}

				void
				vmbus_synic_teardown1(void)
				{
				uint64_t orig;
				uint32_t sint;

				sint = MSR_HV_SINT0 + VMBUS_SINT_TIMER;
				orig = RDMSR(sint);
				WRMSR(sint, orig \| MSR_HV_SINT_MASKED);
				return;
				}

				int
				vmbus_setup_intr1(struct vmbus_softc *sc)
				{
				#if defined(__amd64__) && defined(KLD_MODULE)
				pmap_pti_add_kva(VMBUS_ISR_ADDR, VMBUS_ISR_ADDR + PAGE_SIZE, true);
				#endif

				/*
				* All Hyper-V ISR required resources are setup, now let's find a
				* free IDT vector for Hyper-V ISR and set it up.
				*/
				sc->vmbus_idtvec = lapic_ipi_alloc(
				pti ? IDTVEC(vmbus_isr_pti) : IDTVEC(vmbus_isr));
				if (sc->vmbus_idtvec < 0) {
				#if defined(__amd64__) && defined(KLD_MODULE)
				pmap_pti_remove_kva(VMBUS_ISR_ADDR, VMBUS_ISR_ADDR + PAGE_SIZE);
				#endif
				device_printf(sc->vmbus_dev, "cannot find free IDT vector\n");
				return ENXIO;
				}
				if (bootverbose) {
				device_printf(sc->vmbus_dev, "vmbus IDT vector %d\n",
				sc->vmbus_idtvec);
				}
				return 0;
				}

				void
				vmbus_intr_teardown1(struct vmbus_softc *sc)
				{
				int cpu;

				if (sc->vmbus_idtvec >= 0) {
				lapic_ipi_free(sc->vmbus_idtvec);
				sc->vmbus_idtvec = -1;
				}

				#if defined(__amd64__) && defined(KLD_MODULE)
				pmap_pti_remove_kva(VMBUS_ISR_ADDR, VMBUS_ISR_ADDR + PAGE_SIZE);
				#endif

				CPU_FOREACH(cpu) {
				if (VMBUS_PCPU_GET(sc, event_tq, cpu) != NULL) {
				taskqueue_free(VMBUS_PCPU_GET(sc, event_tq, cpu));
				VMBUS_PCPU_GET(sc, event_tq, cpu) = NULL;
				}
				if (VMBUS_PCPU_GET(sc, message_tq, cpu) != NULL) {
				taskqueue_drain(VMBUS_PCPU_GET(sc, message_tq, cpu),
				VMBUS_PCPU_PTR(sc, message_task, cpu));
				taskqueue_free(VMBUS_PCPU_GET(sc, message_tq, cpu));
				VMBUS_PCPU_GET(sc, message_tq, cpu) = NULL;
				}
				}
				}