cc759c1995
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.
432 lines
11 KiB
C
432 lines
11 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/malloc.h>
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#include <sys/systm.h>
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#include <sys/lock.h>
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#include <sys/mutex.h>
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#include <machine/bus.h>
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#include <vm/vm.h>
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#include <vm/vm_param.h>
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#include <vm/pmap.h>
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#include "hv_vmbus_priv.h"
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/*
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* Globals
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*/
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hv_vmbus_connection hv_vmbus_g_connection =
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{ .connect_state = HV_DISCONNECTED,
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.next_gpadl_handle = 0xE1E10, };
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/**
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* Send a connect request on the partition service connection
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*/
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int
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hv_vmbus_connect(void) {
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int ret = 0;
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hv_vmbus_channel_msg_info* msg_info = NULL;
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hv_vmbus_channel_initiate_contact* msg;
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/**
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* Make sure we are not connecting or connected
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*/
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if (hv_vmbus_g_connection.connect_state != HV_DISCONNECTED) {
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return (-1);
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}
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/**
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* Initialize the vmbus connection
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*/
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hv_vmbus_g_connection.connect_state = HV_CONNECTING;
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hv_vmbus_g_connection.work_queue = hv_work_queue_create("vmbusQ");
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sema_init(&hv_vmbus_g_connection.control_sema, 1, "control_sema");
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TAILQ_INIT(&hv_vmbus_g_connection.channel_msg_anchor);
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mtx_init(&hv_vmbus_g_connection.channel_msg_lock, "vmbus channel msg",
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NULL, MTX_SPIN);
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TAILQ_INIT(&hv_vmbus_g_connection.channel_anchor);
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mtx_init(&hv_vmbus_g_connection.channel_lock, "vmbus channel",
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NULL, MTX_SPIN);
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/**
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* Setup the vmbus event connection for channel interrupt abstraction
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* stuff
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*/
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hv_vmbus_g_connection.interrupt_page = contigmalloc(
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PAGE_SIZE, M_DEVBUF,
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M_NOWAIT | M_ZERO, 0UL,
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BUS_SPACE_MAXADDR,
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PAGE_SIZE, 0);
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KASSERT(hv_vmbus_g_connection.interrupt_page != NULL,
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("Error VMBUS: malloc failed to allocate Channel"
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" Request Event message!"));
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if (hv_vmbus_g_connection.interrupt_page == NULL) {
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ret = ENOMEM;
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goto cleanup;
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}
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hv_vmbus_g_connection.recv_interrupt_page =
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hv_vmbus_g_connection.interrupt_page;
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hv_vmbus_g_connection.send_interrupt_page =
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((uint8_t *) hv_vmbus_g_connection.interrupt_page +
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(PAGE_SIZE >> 1));
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/**
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* Set up the monitor notification facility. The 1st page for
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* parent->child and the 2nd page for child->parent
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*/
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hv_vmbus_g_connection.monitor_pages = contigmalloc(
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2 * PAGE_SIZE,
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M_DEVBUF,
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M_NOWAIT | M_ZERO,
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0UL,
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BUS_SPACE_MAXADDR,
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PAGE_SIZE,
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0);
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KASSERT(hv_vmbus_g_connection.monitor_pages != NULL,
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("Error VMBUS: malloc failed to allocate Monitor Pages!"));
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if (hv_vmbus_g_connection.monitor_pages == NULL) {
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ret = ENOMEM;
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goto cleanup;
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}
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msg_info = (hv_vmbus_channel_msg_info*)
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malloc(sizeof(hv_vmbus_channel_msg_info) +
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sizeof(hv_vmbus_channel_initiate_contact),
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M_DEVBUF, M_NOWAIT | M_ZERO);
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KASSERT(msg_info != NULL,
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("Error VMBUS: malloc failed for Initiate Contact message!"));
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if (msg_info == NULL) {
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ret = ENOMEM;
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goto cleanup;
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}
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sema_init(&msg_info->wait_sema, 0, "Msg Info Sema");
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msg = (hv_vmbus_channel_initiate_contact*) msg_info->msg;
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msg->header.message_type = HV_CHANNEL_MESSAGE_INITIATED_CONTACT;
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msg->vmbus_version_requested = HV_VMBUS_REVISION_NUMBER;
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msg->interrupt_page = hv_get_phys_addr(
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hv_vmbus_g_connection.interrupt_page);
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msg->monitor_page_1 = hv_get_phys_addr(
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hv_vmbus_g_connection.monitor_pages);
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msg->monitor_page_2 =
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hv_get_phys_addr(
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((uint8_t *) hv_vmbus_g_connection.monitor_pages
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+ PAGE_SIZE));
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/**
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* Add to list before we send the request since we may receive the
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* response before returning from this routine
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*/
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mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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TAILQ_INSERT_TAIL(
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&hv_vmbus_g_connection.channel_msg_anchor,
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msg_info,
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msg_list_entry);
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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ret = hv_vmbus_post_message(
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msg,
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sizeof(hv_vmbus_channel_initiate_contact));
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if (ret != 0) {
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mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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TAILQ_REMOVE(
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&hv_vmbus_g_connection.channel_msg_anchor,
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msg_info,
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msg_list_entry);
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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goto cleanup;
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}
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/**
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* Wait for the connection response
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*/
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ret = sema_timedwait(&msg_info->wait_sema, 500); /* KYS 5 seconds */
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mtx_lock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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TAILQ_REMOVE(
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&hv_vmbus_g_connection.channel_msg_anchor,
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msg_info,
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msg_list_entry);
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_msg_lock);
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/**
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* Check if successful
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*/
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if (msg_info->response.version_response.version_supported) {
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hv_vmbus_g_connection.connect_state = HV_CONNECTED;
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} else {
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ret = ECONNREFUSED;
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goto cleanup;
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}
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sema_destroy(&msg_info->wait_sema);
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free(msg_info, M_DEVBUF);
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return (0);
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/*
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* Cleanup after failure!
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*/
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cleanup:
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hv_vmbus_g_connection.connect_state = HV_DISCONNECTED;
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hv_work_queue_close(hv_vmbus_g_connection.work_queue);
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sema_destroy(&hv_vmbus_g_connection.control_sema);
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mtx_destroy(&hv_vmbus_g_connection.channel_lock);
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mtx_destroy(&hv_vmbus_g_connection.channel_msg_lock);
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if (hv_vmbus_g_connection.interrupt_page != NULL) {
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contigfree(
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hv_vmbus_g_connection.interrupt_page,
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PAGE_SIZE,
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M_DEVBUF);
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hv_vmbus_g_connection.interrupt_page = NULL;
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}
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if (hv_vmbus_g_connection.monitor_pages != NULL) {
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contigfree(
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hv_vmbus_g_connection.monitor_pages,
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2 * PAGE_SIZE,
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M_DEVBUF);
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hv_vmbus_g_connection.monitor_pages = NULL;
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}
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if (msg_info) {
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sema_destroy(&msg_info->wait_sema);
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free(msg_info, M_DEVBUF);
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}
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return (ret);
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}
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/**
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* Send a disconnect request on the partition service connection
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*/
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int
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hv_vmbus_disconnect(void) {
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int ret = 0;
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hv_vmbus_channel_unload* msg;
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msg = malloc(sizeof(hv_vmbus_channel_unload),
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M_DEVBUF, M_NOWAIT | M_ZERO);
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KASSERT(msg != NULL,
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("Error VMBUS: malloc failed to allocate Channel Unload Msg!"));
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if (msg == NULL)
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return (ENOMEM);
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msg->message_type = HV_CHANNEL_MESSAGE_UNLOAD;
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ret = hv_vmbus_post_message(msg, sizeof(hv_vmbus_channel_unload));
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contigfree(hv_vmbus_g_connection.interrupt_page, PAGE_SIZE, M_DEVBUF);
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mtx_destroy(&hv_vmbus_g_connection.channel_msg_lock);
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hv_work_queue_close(hv_vmbus_g_connection.work_queue);
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sema_destroy(&hv_vmbus_g_connection.control_sema);
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hv_vmbus_g_connection.connect_state = HV_DISCONNECTED;
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free(msg, M_DEVBUF);
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return (ret);
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}
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/**
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* Get the channel object given its child relative id (ie channel id)
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*/
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hv_vmbus_channel*
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hv_vmbus_get_channel_from_rel_id(uint32_t rel_id) {
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hv_vmbus_channel* channel;
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hv_vmbus_channel* foundChannel = NULL;
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/*
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* TODO:
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* Consider optimization where relids are stored in a fixed size array
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* and channels are accessed without the need to take this lock or search
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* the list.
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*/
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mtx_lock_spin(&hv_vmbus_g_connection.channel_lock);
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TAILQ_FOREACH(channel,
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&hv_vmbus_g_connection.channel_anchor, list_entry) {
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if (channel->offer_msg.child_rel_id == rel_id) {
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foundChannel = channel;
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break;
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}
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}
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mtx_unlock_spin(&hv_vmbus_g_connection.channel_lock);
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return (foundChannel);
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}
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/**
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* Process a channel event notification
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*/
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static void
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VmbusProcessChannelEvent(uint32_t relid)
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{
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hv_vmbus_channel* channel;
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/**
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* Find the channel based on this relid and invokes
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* the channel callback to process the event
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*/
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channel = hv_vmbus_get_channel_from_rel_id(relid);
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if (channel == NULL) {
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return;
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}
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/**
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* To deal with the race condition where we might
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* receive a packet while the relevant driver is
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* being unloaded, dispatch the callback while
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* holding the channel lock. The unloading driver
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* will acquire the same channel lock to set the
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* callback to NULL. This closes the window.
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*/
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mtx_lock(&channel->inbound_lock);
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if (channel->on_channel_callback != NULL) {
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channel->on_channel_callback(channel->channel_callback_context);
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}
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mtx_unlock(&channel->inbound_lock);
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}
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/**
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* Handler for events
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*/
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void
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hv_vmbus_on_events(void *arg)
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{
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int dword;
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int bit;
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int rel_id;
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int maxdword = HV_MAX_NUM_CHANNELS_SUPPORTED >> 5;
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/* int maxdword = PAGE_SIZE >> 3; */
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/*
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* receive size is 1/2 page and divide that by 4 bytes
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*/
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uint32_t* recv_interrupt_page =
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hv_vmbus_g_connection.recv_interrupt_page;
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/*
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* Check events
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*/
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if (recv_interrupt_page != NULL) {
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for (dword = 0; dword < maxdword; dword++) {
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if (recv_interrupt_page[dword]) {
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for (bit = 0; bit < 32; bit++) {
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if (synch_test_and_clear_bit(bit,
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(uint32_t *) &recv_interrupt_page[dword])) {
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rel_id = (dword << 5) + bit;
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if (rel_id == 0) {
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/*
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* Special case -
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* vmbus channel protocol msg.
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*/
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continue;
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} else {
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VmbusProcessChannelEvent(rel_id);
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}
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}
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}
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}
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}
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}
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return;
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}
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/**
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* Send a msg on the vmbus's message connection
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*/
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int hv_vmbus_post_message(void *buffer, size_t bufferLen) {
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int ret = 0;
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hv_vmbus_connection_id connId;
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unsigned retries = 0;
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/* NetScaler delays from previous code were consolidated here */
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static int delayAmount[] = {100, 100, 100, 500, 500, 5000, 5000, 5000};
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/* for(each entry in delayAmount) try to post message,
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* delay a little bit before retrying
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*/
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for (retries = 0;
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retries < sizeof(delayAmount)/sizeof(delayAmount[0]); retries++) {
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connId.as_uint32_t = 0;
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connId.u.id = HV_VMBUS_MESSAGE_CONNECTION_ID;
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ret = hv_vmbus_post_msg_via_msg_ipc(connId, 1, buffer, bufferLen);
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if (ret != HV_STATUS_INSUFFICIENT_BUFFERS)
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break;
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/* TODO: KYS We should use a blocking wait call */
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DELAY(delayAmount[retries]);
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}
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KASSERT(ret == 0, ("Error VMBUS: Message Post Failed\n"));
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return (ret);
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}
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/**
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* Send an event notification to the parent
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*/
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int
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hv_vmbus_set_event(uint32_t child_rel_id) {
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int ret = 0;
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/* Each uint32_t represents 32 channels */
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synch_set_bit(child_rel_id & 31,
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(((uint32_t *)hv_vmbus_g_connection.send_interrupt_page
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+ (child_rel_id >> 5))));
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ret = hv_vmbus_signal_event();
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return (ret);
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}
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