e43d20993a
Suggested by: jhb Reviewed by: Dexuan Cui <decui microsoft com>, Jun Su <junsu microsoft com> Sponsored by: Microsoft OSTC Differential Revision: https://reviews.freebsd.org/D5850
677 lines
16 KiB
C
677 lines
16 KiB
C
/*-
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* Copyright (c) 2009-2012 Microsoft Corp.
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* Copyright (c) 2012 NetApp Inc.
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* Copyright (c) 2012 Citrix Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/*
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* VM Bus Driver Implementation
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/lock.h>
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#include <sys/malloc.h>
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#include <sys/module.h>
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#include <sys/proc.h>
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#include <sys/sysctl.h>
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#include <sys/syslog.h>
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#include <sys/systm.h>
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#include <sys/rtprio.h>
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#include <sys/interrupt.h>
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#include <sys/sx.h>
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#include <sys/taskqueue.h>
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#include <sys/mutex.h>
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#include <sys/smp.h>
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#include <machine/resource.h>
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#include <sys/rman.h>
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#include <machine/stdarg.h>
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#include <machine/intr_machdep.h>
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#include <machine/md_var.h>
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#include <machine/segments.h>
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#include <sys/pcpu.h>
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#include <x86/apicvar.h>
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#include <dev/hyperv/include/hyperv.h>
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#include "hv_vmbus_priv.h"
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#include <contrib/dev/acpica/include/acpi.h>
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#include "acpi_if.h"
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static device_t vmbus_devp;
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static int vmbus_inited;
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static hv_setup_args setup_args; /* only CPU 0 supported at this time */
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static char *vmbus_ids[] = { "VMBUS", NULL };
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/**
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* @brief Software interrupt thread routine to handle channel messages from
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* the hypervisor.
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*/
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static void
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vmbus_msg_swintr(void *arg, int pending __unused)
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{
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int cpu;
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void* page_addr;
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hv_vmbus_channel_msg_header *hdr;
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hv_vmbus_channel_msg_table_entry *entry;
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hv_vmbus_channel_msg_type msg_type;
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hv_vmbus_message* msg;
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cpu = (int)(long)arg;
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KASSERT(cpu <= mp_maxid, ("VMBUS: vmbus_msg_swintr: "
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"cpu out of range!"));
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page_addr = hv_vmbus_g_context.syn_ic_msg_page[cpu];
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msg = (hv_vmbus_message*) page_addr + HV_VMBUS_MESSAGE_SINT;
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for (;;) {
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if (msg->header.message_type == HV_MESSAGE_TYPE_NONE)
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break; /* no message */
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hdr = (hv_vmbus_channel_msg_header *)msg->u.payload;
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msg_type = hdr->message_type;
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if (msg_type >= HV_CHANNEL_MESSAGE_COUNT) {
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printf("VMBUS: unknown message type = %d\n", msg_type);
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goto handled;
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}
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entry = &g_channel_message_table[msg_type];
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if (entry->messageHandler)
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entry->messageHandler(hdr);
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handled:
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msg->header.message_type = HV_MESSAGE_TYPE_NONE;
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/*
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* Make sure the write to message_type (ie set to
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* HV_MESSAGE_TYPE_NONE) happens before we read the
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* message_pending and EOMing. Otherwise, the EOMing will
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* not deliver any more messages
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* since there is no empty slot
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*
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* NOTE:
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* mb() is used here, since atomic_thread_fence_seq_cst()
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* will become compiler fence on UP kernel.
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*/
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mb();
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if (msg->header.message_flags.u.message_pending) {
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/*
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* This will cause message queue rescan to possibly
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* deliver another msg from the hypervisor
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*/
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wrmsr(HV_X64_MSR_EOM, 0);
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}
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}
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}
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/**
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* @brief Interrupt filter routine for VMBUS.
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*
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* The purpose of this routine is to determine the type of VMBUS protocol
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* message to process - an event or a channel message.
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*/
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static inline int
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hv_vmbus_isr(struct trapframe *frame)
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{
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int cpu;
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hv_vmbus_message* msg;
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hv_vmbus_synic_event_flags* event;
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void* page_addr;
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cpu = PCPU_GET(cpuid);
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/*
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* The Windows team has advised that we check for events
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* before checking for messages. This is the way they do it
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* in Windows when running as a guest in Hyper-V
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*/
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page_addr = hv_vmbus_g_context.syn_ic_event_page[cpu];
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event = (hv_vmbus_synic_event_flags*)
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page_addr + HV_VMBUS_MESSAGE_SINT;
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if ((hv_vmbus_protocal_version == HV_VMBUS_VERSION_WS2008) ||
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(hv_vmbus_protocal_version == HV_VMBUS_VERSION_WIN7)) {
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/* Since we are a child, we only need to check bit 0 */
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if (synch_test_and_clear_bit(0, &event->flags32[0])) {
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hv_vmbus_on_events(cpu);
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}
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} else {
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/*
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* On host with Win8 or above, we can directly look at
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* the event page. If bit n is set, we have an interrupt
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* on the channel with id n.
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* Directly schedule the event software interrupt on
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* current cpu.
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*/
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hv_vmbus_on_events(cpu);
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}
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/* Check if there are actual msgs to be process */
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page_addr = hv_vmbus_g_context.syn_ic_msg_page[cpu];
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msg = (hv_vmbus_message*) page_addr + HV_VMBUS_TIMER_SINT;
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/* we call eventtimer process the message */
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if (msg->header.message_type == HV_MESSAGE_TIMER_EXPIRED) {
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msg->header.message_type = HV_MESSAGE_TYPE_NONE;
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/* call intrrupt handler of event timer */
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hv_et_intr(frame);
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/*
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* Make sure the write to message_type (ie set to
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* HV_MESSAGE_TYPE_NONE) happens before we read the
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* message_pending and EOMing. Otherwise, the EOMing will
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* not deliver any more messages
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* since there is no empty slot
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*
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* NOTE:
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* mb() is used here, since atomic_thread_fence_seq_cst()
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* will become compiler fence on UP kernel.
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*/
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mb();
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if (msg->header.message_flags.u.message_pending) {
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/*
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* This will cause message queue rescan to possibly
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* deliver another msg from the hypervisor
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*/
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wrmsr(HV_X64_MSR_EOM, 0);
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}
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}
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msg = (hv_vmbus_message*) page_addr + HV_VMBUS_MESSAGE_SINT;
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if (msg->header.message_type != HV_MESSAGE_TYPE_NONE) {
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taskqueue_enqueue(hv_vmbus_g_context.hv_msg_tq[cpu],
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&hv_vmbus_g_context.hv_msg_task[cpu]);
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}
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return (FILTER_HANDLED);
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}
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u_long *hv_vmbus_intr_cpu[MAXCPU];
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void
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hv_vector_handler(struct trapframe *trap_frame)
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{
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int cpu;
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/*
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* Disable preemption.
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*/
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critical_enter();
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/*
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* Do a little interrupt counting.
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*/
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cpu = PCPU_GET(cpuid);
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(*hv_vmbus_intr_cpu[cpu])++;
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hv_vmbus_isr(trap_frame);
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/*
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* Enable preemption.
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*/
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critical_exit();
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}
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static int
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vmbus_read_ivar(
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device_t dev,
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device_t child,
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int index,
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uintptr_t* result)
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{
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struct hv_device *child_dev_ctx = device_get_ivars(child);
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switch (index) {
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case HV_VMBUS_IVAR_TYPE:
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*result = (uintptr_t) &child_dev_ctx->class_id;
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return (0);
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case HV_VMBUS_IVAR_INSTANCE:
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*result = (uintptr_t) &child_dev_ctx->device_id;
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return (0);
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case HV_VMBUS_IVAR_DEVCTX:
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*result = (uintptr_t) child_dev_ctx;
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return (0);
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case HV_VMBUS_IVAR_NODE:
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*result = (uintptr_t) child_dev_ctx->device;
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return (0);
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}
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return (ENOENT);
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}
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static int
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vmbus_write_ivar(
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device_t dev,
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device_t child,
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int index,
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uintptr_t value)
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{
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switch (index) {
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case HV_VMBUS_IVAR_TYPE:
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case HV_VMBUS_IVAR_INSTANCE:
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case HV_VMBUS_IVAR_DEVCTX:
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case HV_VMBUS_IVAR_NODE:
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/* read-only */
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return (EINVAL);
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}
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return (ENOENT);
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}
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static int
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vmbus_child_pnpinfo_str(device_t dev, device_t child, char *buf, size_t buflen)
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{
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char guidbuf[40];
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struct hv_device *dev_ctx = device_get_ivars(child);
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strlcat(buf, "classid=", buflen);
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snprintf_hv_guid(guidbuf, sizeof(guidbuf), &dev_ctx->class_id);
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strlcat(buf, guidbuf, buflen);
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strlcat(buf, " deviceid=", buflen);
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snprintf_hv_guid(guidbuf, sizeof(guidbuf), &dev_ctx->device_id);
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strlcat(buf, guidbuf, buflen);
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return (0);
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}
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struct hv_device*
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hv_vmbus_child_device_create(
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hv_guid type,
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hv_guid instance,
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hv_vmbus_channel* channel)
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{
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hv_device* child_dev;
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/*
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* Allocate the new child device
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*/
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child_dev = malloc(sizeof(hv_device), M_DEVBUF,
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M_WAITOK | M_ZERO);
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child_dev->channel = channel;
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memcpy(&child_dev->class_id, &type, sizeof(hv_guid));
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memcpy(&child_dev->device_id, &instance, sizeof(hv_guid));
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return (child_dev);
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}
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int
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snprintf_hv_guid(char *buf, size_t sz, const hv_guid *guid)
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{
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int cnt;
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const unsigned char *d = guid->data;
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cnt = snprintf(buf, sz,
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"%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x",
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d[3], d[2], d[1], d[0], d[5], d[4], d[7], d[6],
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d[8], d[9], d[10], d[11], d[12], d[13], d[14], d[15]);
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return (cnt);
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}
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int
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hv_vmbus_child_device_register(struct hv_device *child_dev)
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{
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device_t child;
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int ret = 0;
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if (bootverbose) {
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char name[40];
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snprintf_hv_guid(name, sizeof(name), &child_dev->class_id);
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printf("VMBUS: Class ID: %s\n", name);
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}
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child = device_add_child(vmbus_devp, NULL, -1);
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child_dev->device = child;
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device_set_ivars(child, child_dev);
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mtx_lock(&Giant);
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ret = device_probe_and_attach(child);
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mtx_unlock(&Giant);
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return (0);
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}
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int
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hv_vmbus_child_device_unregister(struct hv_device *child_dev)
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{
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int ret = 0;
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/*
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* XXXKYS: Ensure that this is the opposite of
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* device_add_child()
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*/
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mtx_lock(&Giant);
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ret = device_delete_child(vmbus_devp, child_dev->device);
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mtx_unlock(&Giant);
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return(ret);
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}
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static int
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vmbus_probe(device_t dev) {
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if (ACPI_ID_PROBE(device_get_parent(dev), dev, vmbus_ids) == NULL ||
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device_get_unit(dev) != 0)
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return (ENXIO);
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device_set_desc(dev, "Vmbus Devices");
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return (BUS_PROBE_DEFAULT);
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}
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#ifdef HYPERV
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extern inthand_t IDTVEC(hv_vmbus_callback);
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#endif
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/**
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* @brief Main vmbus driver initialization routine.
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*
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* Here, we
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* - initialize the vmbus driver context
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* - setup various driver entry points
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* - invoke the vmbus hv main init routine
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* - get the irq resource
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* - invoke the vmbus to add the vmbus root device
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* - setup the vmbus root device
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* - retrieve the channel offers
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*/
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static int
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vmbus_bus_init(void)
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{
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int i, j, n, ret;
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char buf[MAXCOMLEN + 1];
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cpuset_t cpu_mask;
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if (vmbus_inited)
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return (0);
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vmbus_inited = 1;
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ret = hv_vmbus_init();
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if (ret) {
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if(bootverbose)
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printf("Error VMBUS: Hypervisor Initialization Failed!\n");
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return (ret);
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}
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#ifdef HYPERV
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/*
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* Find a free IDT slot for vmbus callback.
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*/
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hv_vmbus_g_context.hv_cb_vector = lapic_ipi_alloc(IDTVEC(hv_vmbus_callback));
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#else
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hv_vmbus_g_context.hv_cb_vector = -1;
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#endif
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if (hv_vmbus_g_context.hv_cb_vector < 0) {
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if(bootverbose)
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printf("Error VMBUS: Cannot find free IDT slot for "
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"vmbus callback!\n");
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goto cleanup;
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}
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if(bootverbose)
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printf("VMBUS: vmbus callback vector %d\n",
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hv_vmbus_g_context.hv_cb_vector);
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/*
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* Notify the hypervisor of our vector.
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*/
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setup_args.vector = hv_vmbus_g_context.hv_cb_vector;
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CPU_FOREACH(j) {
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snprintf(buf, sizeof(buf), "cpu%d:hyperv", j);
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intrcnt_add(buf, &hv_vmbus_intr_cpu[j]);
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for (i = 0; i < 2; i++)
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setup_args.page_buffers[2 * j + i] = NULL;
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}
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/*
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* Per cpu setup.
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*/
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CPU_FOREACH(j) {
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/*
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* Setup taskqueue to handle events
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*/
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hv_vmbus_g_context.hv_event_queue[j] = taskqueue_create_fast("hyperv event", M_WAITOK,
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taskqueue_thread_enqueue, &hv_vmbus_g_context.hv_event_queue[j]);
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CPU_SETOF(j, &cpu_mask);
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taskqueue_start_threads_cpuset(&hv_vmbus_g_context.hv_event_queue[j], 1, PI_NET, &cpu_mask,
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"hvevent%d", j);
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/*
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* Setup per-cpu tasks and taskqueues to handle msg.
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*/
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hv_vmbus_g_context.hv_msg_tq[j] = taskqueue_create_fast(
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"hyperv msg", M_WAITOK, taskqueue_thread_enqueue,
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&hv_vmbus_g_context.hv_msg_tq[j]);
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CPU_SETOF(j, &cpu_mask);
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taskqueue_start_threads_cpuset(&hv_vmbus_g_context.hv_msg_tq[j],
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1, PI_NET, &cpu_mask, "hvmsg%d", j);
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TASK_INIT(&hv_vmbus_g_context.hv_msg_task[j], 0,
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vmbus_msg_swintr, (void *)(long)j);
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/*
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* Prepare the per cpu msg and event pages to be called on each cpu.
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*/
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for(i = 0; i < 2; i++) {
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setup_args.page_buffers[2 * j + i] =
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malloc(PAGE_SIZE, M_DEVBUF, M_WAITOK | M_ZERO);
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}
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}
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if (bootverbose)
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printf("VMBUS: Calling smp_rendezvous, smp_started = %d\n",
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smp_started);
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smp_rendezvous(NULL, hv_vmbus_synic_init, NULL, &setup_args);
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/*
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* Connect to VMBus in the root partition
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*/
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ret = hv_vmbus_connect();
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if (ret != 0)
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goto cleanup1;
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hv_vmbus_request_channel_offers();
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|
return (ret);
|
|
|
|
cleanup1:
|
|
/*
|
|
* Free pages alloc'ed
|
|
*/
|
|
for (n = 0; n < 2 * MAXCPU; n++)
|
|
if (setup_args.page_buffers[n] != NULL)
|
|
free(setup_args.page_buffers[n], M_DEVBUF);
|
|
|
|
/*
|
|
* remove swi and vmbus callback vector;
|
|
*/
|
|
CPU_FOREACH(j) {
|
|
if (hv_vmbus_g_context.hv_event_queue[j] != NULL) {
|
|
taskqueue_free(hv_vmbus_g_context.hv_event_queue[j]);
|
|
hv_vmbus_g_context.hv_event_queue[j] = NULL;
|
|
}
|
|
}
|
|
|
|
lapic_ipi_free(hv_vmbus_g_context.hv_cb_vector);
|
|
|
|
cleanup:
|
|
hv_vmbus_cleanup();
|
|
|
|
return (ret);
|
|
}
|
|
|
|
static int
|
|
vmbus_attach(device_t dev)
|
|
{
|
|
if(bootverbose)
|
|
device_printf(dev, "VMBUS: attach dev: %p\n", dev);
|
|
vmbus_devp = dev;
|
|
|
|
/*
|
|
* If the system has already booted and thread
|
|
* scheduling is possible indicated by the global
|
|
* cold set to zero, we just call the driver
|
|
* initialization directly.
|
|
*/
|
|
if (!cold)
|
|
vmbus_bus_init();
|
|
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vmbus_init(void)
|
|
{
|
|
if (vm_guest != VM_GUEST_HV)
|
|
return;
|
|
|
|
/*
|
|
* If the system has already booted and thread
|
|
* scheduling is possible, as indicated by the
|
|
* global cold set to zero, we just call the driver
|
|
* initialization directly.
|
|
*/
|
|
if (!cold)
|
|
vmbus_bus_init();
|
|
}
|
|
|
|
static void
|
|
vmbus_bus_exit(void)
|
|
{
|
|
int i;
|
|
|
|
hv_vmbus_release_unattached_channels();
|
|
hv_vmbus_disconnect();
|
|
|
|
smp_rendezvous(NULL, hv_vmbus_synic_cleanup, NULL, NULL);
|
|
|
|
for(i = 0; i < 2 * MAXCPU; i++) {
|
|
if (setup_args.page_buffers[i] != 0)
|
|
free(setup_args.page_buffers[i], M_DEVBUF);
|
|
}
|
|
|
|
hv_vmbus_cleanup();
|
|
|
|
/* remove swi */
|
|
CPU_FOREACH(i) {
|
|
if (hv_vmbus_g_context.hv_event_queue[i] != NULL) {
|
|
taskqueue_free(hv_vmbus_g_context.hv_event_queue[i]);
|
|
hv_vmbus_g_context.hv_event_queue[i] = NULL;
|
|
}
|
|
}
|
|
|
|
lapic_ipi_free(hv_vmbus_g_context.hv_cb_vector);
|
|
|
|
return;
|
|
}
|
|
|
|
static void
|
|
vmbus_exit(void)
|
|
{
|
|
vmbus_bus_exit();
|
|
}
|
|
|
|
static int
|
|
vmbus_detach(device_t dev)
|
|
{
|
|
vmbus_exit();
|
|
return (0);
|
|
}
|
|
|
|
static void
|
|
vmbus_mod_load(void)
|
|
{
|
|
if(bootverbose)
|
|
printf("VMBUS: load\n");
|
|
}
|
|
|
|
static void
|
|
vmbus_mod_unload(void)
|
|
{
|
|
if(bootverbose)
|
|
printf("VMBUS: unload\n");
|
|
}
|
|
|
|
static int
|
|
vmbus_modevent(module_t mod, int what, void *arg)
|
|
{
|
|
switch (what) {
|
|
|
|
case MOD_LOAD:
|
|
vmbus_mod_load();
|
|
break;
|
|
case MOD_UNLOAD:
|
|
vmbus_mod_unload();
|
|
break;
|
|
}
|
|
|
|
return (0);
|
|
}
|
|
|
|
static device_method_t vmbus_methods[] = {
|
|
/** Device interface */
|
|
DEVMETHOD(device_probe, vmbus_probe),
|
|
DEVMETHOD(device_attach, vmbus_attach),
|
|
DEVMETHOD(device_detach, vmbus_detach),
|
|
DEVMETHOD(device_shutdown, bus_generic_shutdown),
|
|
DEVMETHOD(device_suspend, bus_generic_suspend),
|
|
DEVMETHOD(device_resume, bus_generic_resume),
|
|
|
|
/** Bus interface */
|
|
DEVMETHOD(bus_add_child, bus_generic_add_child),
|
|
DEVMETHOD(bus_print_child, bus_generic_print_child),
|
|
DEVMETHOD(bus_read_ivar, vmbus_read_ivar),
|
|
DEVMETHOD(bus_write_ivar, vmbus_write_ivar),
|
|
DEVMETHOD(bus_child_pnpinfo_str, vmbus_child_pnpinfo_str),
|
|
|
|
{ 0, 0 } };
|
|
|
|
static char driver_name[] = "vmbus";
|
|
static driver_t vmbus_driver = { driver_name, vmbus_methods,0, };
|
|
|
|
|
|
devclass_t vmbus_devclass;
|
|
|
|
DRIVER_MODULE(vmbus, acpi, vmbus_driver, vmbus_devclass, vmbus_modevent, 0);
|
|
MODULE_DEPEND(vmbus, acpi, 1, 1, 1);
|
|
MODULE_VERSION(vmbus, 1);
|
|
|
|
/* We want to be started after SMP is initialized */
|
|
SYSINIT(vmb_init, SI_SUB_SMP + 1, SI_ORDER_FIRST, vmbus_init, NULL);
|
|
|