c8195f5331
be pulled into FreeBSD. From now, FreeBSD will be considered the upstream repo. First step: move the drivers away from the contrib area and into the base system. A follow-on commit will include the drivers in the amd64 GENERIC kernel.
681 lines
19 KiB
C
681 lines
19 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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#include <sys/param.h>
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#include <sys/mbuf.h>
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#include "hv_vmbus_priv.h"
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typedef void (*hv_pfn_channel_msg_handler)(hv_vmbus_channel_msg_header* msg);
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typedef struct hv_vmbus_channel_msg_table_entry {
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hv_vmbus_channel_msg_type messageType;
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hv_pfn_channel_msg_handler messageHandler;
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} hv_vmbus_channel_msg_table_entry;
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/*
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* Internal functions
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*/
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static void vmbus_channel_on_offer(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_open_result(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_offer_rescind(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_gpadl_created(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_gpadl_torndown(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_offers_delivered(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_on_version_response(hv_vmbus_channel_msg_header* hdr);
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static void vmbus_channel_process_offer(void *context);
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/**
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* Channel message dispatch table
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*/
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hv_vmbus_channel_msg_table_entry
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g_channel_message_table[HV_CHANNEL_MESSAGE_COUNT] = {
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{ HV_CHANNEL_MESSAGE_INVALID, NULL },
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{ HV_CHANNEL_MESSAGE_OFFER_CHANNEL, vmbus_channel_on_offer },
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{ HV_CHANNEL_MESSAGE_RESCIND_CHANNEL_OFFER,
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vmbus_channel_on_offer_rescind },
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{ HV_CHANNEL_MESSAGE_REQUEST_OFFERS, NULL },
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{ HV_CHANNEL_MESSAGE_ALL_OFFERS_DELIVERED,
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vmbus_channel_on_offers_delivered },
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{ HV_CHANNEL_MESSAGE_OPEN_CHANNEL, NULL },
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{ HV_CHANNEL_MESSAGE_OPEN_CHANNEL_RESULT,
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vmbus_channel_on_open_result },
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{ HV_CHANNEL_MESSAGE_CLOSE_CHANNEL, NULL },
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{ HV_CHANNEL_MESSAGEL_GPADL_HEADER, NULL },
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{ HV_CHANNEL_MESSAGE_GPADL_BODY, NULL },
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{ HV_CHANNEL_MESSAGE_GPADL_CREATED,
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vmbus_channel_on_gpadl_created },
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{ HV_CHANNEL_MESSAGE_GPADL_TEARDOWN, NULL },
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{ HV_CHANNEL_MESSAGE_GPADL_TORNDOWN,
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vmbus_channel_on_gpadl_torndown },
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{ HV_CHANNEL_MESSAGE_REL_ID_RELEASED, NULL },
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{ HV_CHANNEL_MESSAGE_INITIATED_CONTACT, NULL },
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{ HV_CHANNEL_MESSAGE_VERSION_RESPONSE,
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vmbus_channel_on_version_response },
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{ HV_CHANNEL_MESSAGE_UNLOAD, NULL }
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};
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/**
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* Implementation of the work abstraction.
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*/
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static void
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work_item_callback(void *work, int pending)
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{
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struct hv_work_item *w = (struct hv_work_item *)work;
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/*
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* Serialize work execution.
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*/
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if (w->wq->work_sema != NULL) {
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sema_wait(w->wq->work_sema);
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}
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w->callback(w->context);
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if (w->wq->work_sema != NULL) {
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sema_post(w->wq->work_sema);
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}
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free(w, M_DEVBUF);
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}
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struct hv_work_queue*
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hv_work_queue_create(char* name)
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{
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static unsigned int qid = 0;
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char qname[64];
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int pri;
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struct hv_work_queue* wq;
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wq = malloc(sizeof(struct hv_work_queue), M_DEVBUF, M_NOWAIT | M_ZERO);
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KASSERT(wq != NULL, ("Error VMBUS: Failed to allocate work_queue\n"));
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if (wq == NULL)
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return (NULL);
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/*
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* We use work abstraction to handle messages
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* coming from the host and these are typically offers.
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* Some FreeBsd drivers appear to have a concurrency issue
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* where probe/attach needs to be serialized. We ensure that
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* by having only one thread process work elements in a
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* specific queue by serializing work execution.
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*
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*/
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if (strcmp(name, "vmbusQ") == 0) {
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pri = PI_DISK;
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} else { /* control */
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pri = PI_NET;
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/*
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* Initialize semaphore for this queue by pointing
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* to the globale semaphore used for synchronizing all
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* control messages.
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*/
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wq->work_sema = &hv_vmbus_g_connection.control_sema;
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}
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sprintf(qname, "hv_%s_%u", name, qid);
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/*
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* Fixme: FreeBSD 8.2 has a different prototype for
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* taskqueue_create(), and for certain other taskqueue functions.
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* We need to research the implications of these changes.
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* Fixme: Not sure when the changes were introduced.
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*/
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wq->queue = taskqueue_create(qname, M_NOWAIT, taskqueue_thread_enqueue,
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&wq->queue
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#if __FreeBSD_version < 800000
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, &wq->proc
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#endif
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);
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if (wq->queue == NULL) {
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free(wq, M_DEVBUF);
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return (NULL);
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}
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if (taskqueue_start_threads(&wq->queue, 1, pri, "%s taskq", qname)) {
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taskqueue_free(wq->queue);
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free(wq, M_DEVBUF);
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return (NULL);
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}
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qid++;
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return (wq);
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}
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void
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hv_work_queue_close(struct hv_work_queue *wq)
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{
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/*
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* KYS: Need to drain the taskqueue
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* before we close the hv_work_queue.
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*/
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/*KYS: taskqueue_drain(wq->tq, ); */
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taskqueue_free(wq->queue);
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free(wq, M_DEVBUF);
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}
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/**
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* @brief Create work item
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*/
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int
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hv_queue_work_item(
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struct hv_work_queue *wq,
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void (*callback)(void *), void *context)
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{
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struct hv_work_item *w = malloc(sizeof(struct hv_work_item),
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M_DEVBUF, M_NOWAIT | M_ZERO);
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KASSERT(w != NULL, ("Error VMBUS: Failed to allocate WorkItem\n"));
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if (w == NULL)
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return (ENOMEM);
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w->callback = callback;
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w->context = context;
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w->wq = wq;
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TASK_INIT(&w->work, 0, work_item_callback, w);
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return (taskqueue_enqueue(wq->queue, &w->work));
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}
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/**
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* @brief Rescind the offer by initiating a device removal
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*/
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static void
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vmbus_channel_process_rescind_offer(void *context)
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{
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hv_vmbus_channel* channel = (hv_vmbus_channel*) context;
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hv_vmbus_child_device_unregister(channel->device);
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}
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/**
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* @brief Allocate and initialize a vmbus channel object
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*/
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hv_vmbus_channel*
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hv_vmbus_allocate_channel(void)
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{
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hv_vmbus_channel* channel;
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channel = (hv_vmbus_channel*) malloc(
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sizeof(hv_vmbus_channel),
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M_DEVBUF,
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M_NOWAIT | M_ZERO);
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KASSERT(channel != NULL, ("Error VMBUS: Failed to allocate channel!"));
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if (channel == NULL)
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return (NULL);
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mtx_init(&channel->inbound_lock, "channel inbound", NULL, MTX_DEF);
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channel->control_work_queue = hv_work_queue_create("control");
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if (channel->control_work_queue == NULL) {
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mtx_destroy(&channel->inbound_lock);
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free(channel, M_DEVBUF);
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return (NULL);
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}
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return (channel);
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}
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/**
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* @brief Release the vmbus channel object itself
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*/
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static inline void
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ReleaseVmbusChannel(void *context)
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{
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hv_vmbus_channel* channel = (hv_vmbus_channel*) context;
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hv_work_queue_close(channel->control_work_queue);
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free(channel, M_DEVBUF);
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}
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/**
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* @brief Release the resources used by the vmbus channel object
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*/
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void
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hv_vmbus_free_vmbus_channel(hv_vmbus_channel* channel)
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{
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mtx_destroy(&channel->inbound_lock);
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/*
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* We have to release the channel's workqueue/thread in
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* the vmbus's workqueue/thread context
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* ie we can't destroy ourselves
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*/
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hv_queue_work_item(hv_vmbus_g_connection.work_queue,
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ReleaseVmbusChannel, (void *) channel);
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}
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/**
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* @brief Process the offer by creating a channel/device
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* associated with this offer
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*/
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static void
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vmbus_channel_process_offer(void *context)
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{
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int ret;
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hv_vmbus_channel* new_channel;
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boolean_t f_new;
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hv_vmbus_channel* channel;
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new_channel = (hv_vmbus_channel*) context;
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f_new = TRUE;
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channel = NULL;
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/*
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* Make sure this is a new offer
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*/
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mtx_lock_spin(&hv_vmbus_g_connection.channel_lock);
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TAILQ_FOREACH(channel, &hv_vmbus_g_connection.channel_anchor,
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list_entry)
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{
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if (!memcmp(
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&channel->offer_msg.offer.interface_type,
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&new_channel->offer_msg.offer.interface_type,
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sizeof(hv_guid))
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&& !memcmp(
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&channel->offer_msg.offer.interface_instance,
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&new_channel->offer_msg.offer.interface_instance,
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sizeof(hv_guid))) {
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f_new = FALSE;
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break;
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}
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}
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if (f_new) {
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/* Insert at tail */
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TAILQ_INSERT_TAIL(
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&hv_vmbus_g_connection.channel_anchor,
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new_channel,
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list_entry);
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}
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_lock);
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if (!f_new) {
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hv_vmbus_free_vmbus_channel(new_channel);
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return;
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}
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/*
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* Start the process of binding this offer to the driver
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* (We need to set the device field before calling
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* hv_vmbus_child_device_add())
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*/
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new_channel->device = hv_vmbus_child_device_create(
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new_channel->offer_msg.offer.interface_type,
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new_channel->offer_msg.offer.interface_instance, new_channel);
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/*
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* TODO - the HV_CHANNEL_OPEN_STATE flag should not be set below
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* but in the "open" channel request. The ret != 0 logic below
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* doesn't take into account that a channel
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* may have been opened successfully
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*/
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/*
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* Add the new device to the bus. This will kick off device-driver
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* binding which eventually invokes the device driver's AddDevice()
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* method.
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*/
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ret = hv_vmbus_child_device_register(new_channel->device);
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if (ret != 0) {
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mtx_lock_spin(&hv_vmbus_g_connection.channel_lock);
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TAILQ_REMOVE(
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&hv_vmbus_g_connection.channel_anchor,
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new_channel,
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list_entry);
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_lock);
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hv_vmbus_free_vmbus_channel(new_channel);
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} else {
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/*
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* This state is used to indicate a successful open
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* so that when we do close the channel normally,
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* we can clean up properly
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*/
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new_channel->state = HV_CHANNEL_OPEN_STATE;
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}
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}
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/**
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* @brief Handler for channel offers from Hyper-V/Azure
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*
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* Handler for channel offers from vmbus in parent partition. We ignore
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* all offers except network and storage offers. For each network and storage
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* offers, we create a channel object and queue a work item to the channel
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* object to process the offer synchronously
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*/
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static void
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vmbus_channel_on_offer(hv_vmbus_channel_msg_header* hdr)
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{
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hv_vmbus_channel_offer_channel* offer;
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hv_vmbus_channel* new_channel;
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offer = (hv_vmbus_channel_offer_channel*) hdr;
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hv_guid *guidType;
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hv_guid *guidInstance;
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guidType = &offer->offer.interface_type;
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guidInstance = &offer->offer.interface_instance;
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/* Allocate the channel object and save this offer */
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new_channel = hv_vmbus_allocate_channel();
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if (new_channel == NULL)
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return;
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memcpy(&new_channel->offer_msg, offer,
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sizeof(hv_vmbus_channel_offer_channel));
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new_channel->monitor_group = (uint8_t) offer->monitor_id / 32;
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new_channel->monitor_bit = (uint8_t) offer->monitor_id % 32;
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/* TODO: Make sure the offer comes from our parent partition */
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hv_queue_work_item(
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new_channel->control_work_queue,
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vmbus_channel_process_offer,
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new_channel);
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}
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/**
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* @brief Rescind offer handler.
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*
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* We queue a work item to process this offer
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* synchronously
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*/
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static void
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vmbus_channel_on_offer_rescind(hv_vmbus_channel_msg_header* hdr)
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{
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hv_vmbus_channel_rescind_offer* rescind;
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hv_vmbus_channel* channel;
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rescind = (hv_vmbus_channel_rescind_offer*) hdr;
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channel = hv_vmbus_get_channel_from_rel_id(rescind->child_rel_id);
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if (channel == NULL)
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return;
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hv_queue_work_item(channel->control_work_queue,
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vmbus_channel_process_rescind_offer, channel);
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}
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/**
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*
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* @brief Invoked when all offers have been delivered.
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*/
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static void
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vmbus_channel_on_offers_delivered(hv_vmbus_channel_msg_header* hdr)
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{
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}
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/**
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* @brief Open result handler.
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*
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* This is invoked when we received a response
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* to our channel open request. Find the matching request, copy the
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* response and signal the requesting thread.
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*/
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static void
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vmbus_channel_on_open_result(hv_vmbus_channel_msg_header* hdr)
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{
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hv_vmbus_channel_open_result* result;
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hv_vmbus_channel_msg_info* msg_info;
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hv_vmbus_channel_msg_header* requestHeader;
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hv_vmbus_channel_open_channel* openMsg;
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result = (hv_vmbus_channel_open_result*) hdr;
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/*
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* Find the open msg, copy the result and signal/unblock the wait event
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*/
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mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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TAILQ_FOREACH(msg_info, &hv_vmbus_g_connection.channel_msg_anchor,
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msg_list_entry) {
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requestHeader = (hv_vmbus_channel_msg_header*) msg_info->msg;
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if (requestHeader->message_type ==
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HV_CHANNEL_MESSAGE_OPEN_CHANNEL) {
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openMsg = (hv_vmbus_channel_open_channel*) msg_info->msg;
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if (openMsg->child_rel_id == result->child_rel_id
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&& openMsg->open_id == result->open_id) {
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memcpy(&msg_info->response.open_result, result,
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sizeof(hv_vmbus_channel_open_result));
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sema_post(&msg_info->wait_sema);
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break;
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}
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}
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}
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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}
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/**
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* @brief GPADL created handler.
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*
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* This is invoked when we received a response
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* to our gpadl create request. Find the matching request, copy the
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* response and signal the requesting thread.
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*/
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static void
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vmbus_channel_on_gpadl_created(hv_vmbus_channel_msg_header* hdr)
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{
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hv_vmbus_channel_gpadl_created* gpadl_created;
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hv_vmbus_channel_msg_info* msg_info;
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hv_vmbus_channel_msg_header* request_header;
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hv_vmbus_channel_gpadl_header* gpadl_header;
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gpadl_created = (hv_vmbus_channel_gpadl_created*) hdr;
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/* Find the establish msg, copy the result and signal/unblock
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* the wait event
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*/
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mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
TAILQ_FOREACH(msg_info, &hv_vmbus_g_connection.channel_msg_anchor,
|
|
msg_list_entry) {
|
|
request_header = (hv_vmbus_channel_msg_header*) msg_info->msg;
|
|
if (request_header->message_type ==
|
|
HV_CHANNEL_MESSAGEL_GPADL_HEADER) {
|
|
gpadl_header =
|
|
(hv_vmbus_channel_gpadl_header*) request_header;
|
|
|
|
if ((gpadl_created->child_rel_id == gpadl_header->child_rel_id)
|
|
&& (gpadl_created->gpadl == gpadl_header->gpadl)) {
|
|
memcpy(&msg_info->response.gpadl_created,
|
|
gpadl_created,
|
|
sizeof(hv_vmbus_channel_gpadl_created));
|
|
sema_post(&msg_info->wait_sema);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
}
|
|
|
|
/**
|
|
* @brief GPADL torndown handler.
|
|
*
|
|
* This is invoked when we received a respons
|
|
* to our gpadl teardown request. Find the matching request, copy the
|
|
* response and signal the requesting thread
|
|
*/
|
|
static void
|
|
vmbus_channel_on_gpadl_torndown(hv_vmbus_channel_msg_header* hdr)
|
|
{
|
|
hv_vmbus_channel_gpadl_torndown* gpadl_torndown;
|
|
hv_vmbus_channel_msg_info* msg_info;
|
|
hv_vmbus_channel_msg_header* requestHeader;
|
|
hv_vmbus_channel_gpadl_teardown* gpadlTeardown;
|
|
|
|
gpadl_torndown = (hv_vmbus_channel_gpadl_torndown*)hdr;
|
|
|
|
/*
|
|
* Find the open msg, copy the result and signal/unblock the
|
|
* wait event.
|
|
*/
|
|
|
|
mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
|
|
TAILQ_FOREACH(msg_info, &hv_vmbus_g_connection.channel_msg_anchor,
|
|
msg_list_entry) {
|
|
requestHeader = (hv_vmbus_channel_msg_header*) msg_info->msg;
|
|
|
|
if (requestHeader->message_type
|
|
== HV_CHANNEL_MESSAGE_GPADL_TEARDOWN) {
|
|
gpadlTeardown =
|
|
(hv_vmbus_channel_gpadl_teardown*) requestHeader;
|
|
|
|
if (gpadl_torndown->gpadl == gpadlTeardown->gpadl) {
|
|
memcpy(&msg_info->response.gpadl_torndown,
|
|
gpadl_torndown,
|
|
sizeof(hv_vmbus_channel_gpadl_torndown));
|
|
sema_post(&msg_info->wait_sema);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
}
|
|
|
|
/**
|
|
* @brief Version response handler.
|
|
*
|
|
* This is invoked when we received a response
|
|
* to our initiate contact request. Find the matching request, copy th
|
|
* response and signal the requesting thread.
|
|
*/
|
|
static void
|
|
vmbus_channel_on_version_response(hv_vmbus_channel_msg_header* hdr)
|
|
{
|
|
hv_vmbus_channel_msg_info* msg_info;
|
|
hv_vmbus_channel_msg_header* requestHeader;
|
|
hv_vmbus_channel_initiate_contact* initiate;
|
|
hv_vmbus_channel_version_response* versionResponse;
|
|
|
|
versionResponse = (hv_vmbus_channel_version_response*)hdr;
|
|
|
|
mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
TAILQ_FOREACH(msg_info, &hv_vmbus_g_connection.channel_msg_anchor,
|
|
msg_list_entry) {
|
|
requestHeader = (hv_vmbus_channel_msg_header*) msg_info->msg;
|
|
if (requestHeader->message_type
|
|
== HV_CHANNEL_MESSAGE_INITIATED_CONTACT) {
|
|
initiate =
|
|
(hv_vmbus_channel_initiate_contact*) requestHeader;
|
|
memcpy(&msg_info->response.version_response,
|
|
versionResponse,
|
|
sizeof(hv_vmbus_channel_version_response));
|
|
sema_post(&msg_info->wait_sema);
|
|
}
|
|
}
|
|
mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
|
|
|
|
}
|
|
|
|
/**
|
|
* @brief Handler for channel protocol messages.
|
|
*
|
|
* This is invoked in the vmbus worker thread context.
|
|
*/
|
|
void
|
|
hv_vmbus_on_channel_message(void *context)
|
|
{
|
|
hv_vmbus_message* msg;
|
|
hv_vmbus_channel_msg_header* hdr;
|
|
int size;
|
|
|
|
msg = (hv_vmbus_message*) context;
|
|
hdr = (hv_vmbus_channel_msg_header*) msg->u.payload;
|
|
size = msg->header.payload_size;
|
|
|
|
if (hdr->message_type >= HV_CHANNEL_MESSAGE_COUNT) {
|
|
free(msg, M_DEVBUF);
|
|
return;
|
|
}
|
|
|
|
if (g_channel_message_table[hdr->message_type].messageHandler) {
|
|
g_channel_message_table[hdr->message_type].messageHandler(hdr);
|
|
}
|
|
|
|
/* Free the msg that was allocated in VmbusOnMsgDPC() */
|
|
free(msg, M_DEVBUF);
|
|
}
|
|
|
|
/**
|
|
* @brief Send a request to get all our pending offers.
|
|
*/
|
|
int
|
|
hv_vmbus_request_channel_offers(void)
|
|
{
|
|
int ret;
|
|
hv_vmbus_channel_msg_header* msg;
|
|
hv_vmbus_channel_msg_info* msg_info;
|
|
|
|
msg_info = (hv_vmbus_channel_msg_info *)
|
|
malloc(sizeof(hv_vmbus_channel_msg_info)
|
|
+ sizeof(hv_vmbus_channel_msg_header), M_DEVBUF, M_NOWAIT);
|
|
|
|
if (msg_info == NULL) {
|
|
if(bootverbose)
|
|
printf("Error VMBUS: malloc failed for Request Offers\n");
|
|
return (ENOMEM);
|
|
}
|
|
|
|
msg = (hv_vmbus_channel_msg_header*) msg_info->msg;
|
|
msg->message_type = HV_CHANNEL_MESSAGE_REQUEST_OFFERS;
|
|
|
|
ret = hv_vmbus_post_message(msg, sizeof(hv_vmbus_channel_msg_header));
|
|
|
|
if (msg_info)
|
|
free(msg_info, M_DEVBUF);
|
|
|
|
return (ret);
|
|
}
|
|
|
|
/**
|
|
* @brief Release channels that are unattached/unconnected (i.e., no drivers associated)
|
|
*/
|
|
void
|
|
hv_vmbus_release_unattached_channels(void)
|
|
{
|
|
hv_vmbus_channel *channel;
|
|
|
|
mtx_lock_spin(&hv_vmbus_g_connection.channel_lock);
|
|
|
|
while (!TAILQ_EMPTY(&hv_vmbus_g_connection.channel_anchor)) {
|
|
channel = TAILQ_FIRST(&hv_vmbus_g_connection.channel_anchor);
|
|
TAILQ_REMOVE(&hv_vmbus_g_connection.channel_anchor,
|
|
channel, list_entry);
|
|
|
|
hv_vmbus_child_device_unregister(channel->device);
|
|
hv_vmbus_free_vmbus_channel(channel);
|
|
}
|
|
mtx_unlock_spin(&hv_vmbus_g_connection.channel_lock);
|
|
}
|