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![Greg Kroah-Hartman](/assets/img/avatar_default.png)
No one outside of the hyperv core needs to include the asm/hyperv.h file, so don't put it in the "global" include/linux/hyperv.h file. Cc: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
318 lines
8.1 KiB
C
318 lines
8.1 KiB
C
/*
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*
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* Copyright (c) 2009, Microsoft Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
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* Place - Suite 330, Boston, MA 02111-1307 USA.
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*
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* Authors:
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* Haiyang Zhang <haiyangz@microsoft.com>
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* Hank Janssen <hjanssen@microsoft.com>
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*
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*/
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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#include <linux/kernel.h>
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#include <linux/sched.h>
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#include <linux/wait.h>
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#include <linux/delay.h>
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#include <linux/mm.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include <linux/hyperv.h>
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#include <asm/hyperv.h>
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#include "hyperv_vmbus.h"
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struct vmbus_connection vmbus_connection = {
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.conn_state = DISCONNECTED,
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.next_gpadl_handle = ATOMIC_INIT(0xE1E10),
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};
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/*
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* vmbus_connect - Sends a connect request on the partition service connection
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*/
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int vmbus_connect(void)
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{
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int ret = 0;
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int t;
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struct vmbus_channel_msginfo *msginfo = NULL;
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struct vmbus_channel_initiate_contact *msg;
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unsigned long flags;
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/* Initialize the vmbus connection */
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vmbus_connection.conn_state = CONNECTING;
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vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
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if (!vmbus_connection.work_queue) {
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ret = -ENOMEM;
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goto cleanup;
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}
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INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
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spin_lock_init(&vmbus_connection.channelmsg_lock);
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INIT_LIST_HEAD(&vmbus_connection.chn_list);
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spin_lock_init(&vmbus_connection.channel_lock);
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/*
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* Setup the vmbus event connection for channel interrupt
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* abstraction stuff
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*/
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vmbus_connection.int_page =
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(void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
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if (vmbus_connection.int_page == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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vmbus_connection.recv_int_page = vmbus_connection.int_page;
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vmbus_connection.send_int_page =
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(void *)((unsigned long)vmbus_connection.int_page +
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(PAGE_SIZE >> 1));
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/*
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* Setup 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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vmbus_connection.monitor_pages =
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(void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1);
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if (vmbus_connection.monitor_pages == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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msginfo = kzalloc(sizeof(*msginfo) +
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sizeof(struct vmbus_channel_initiate_contact),
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GFP_KERNEL);
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if (msginfo == NULL) {
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ret = -ENOMEM;
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goto cleanup;
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}
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init_completion(&msginfo->waitevent);
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msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
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msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
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msg->vmbus_version_requested = VMBUS_REVISION_NUMBER;
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msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
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msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages);
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msg->monitor_page2 = virt_to_phys(
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(void *)((unsigned long)vmbus_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
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* receive the response before returning from this routine
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*/
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_add_tail(&msginfo->msglistentry,
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&vmbus_connection.chn_msg_list);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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ret = vmbus_post_msg(msg,
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sizeof(struct vmbus_channel_initiate_contact));
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if (ret != 0) {
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_del(&msginfo->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
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flags);
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goto cleanup;
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}
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/* Wait for the connection response */
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t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
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if (t == 0) {
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
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flags);
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list_del(&msginfo->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
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flags);
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ret = -ETIMEDOUT;
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goto cleanup;
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}
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spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
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list_del(&msginfo->msglistentry);
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spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
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/* Check if successful */
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if (msginfo->response.version_response.version_supported) {
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vmbus_connection.conn_state = CONNECTED;
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} else {
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pr_err("Unable to connect, "
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"Version %d not supported by Hyper-V\n",
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VMBUS_REVISION_NUMBER);
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ret = -ECONNREFUSED;
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goto cleanup;
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}
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kfree(msginfo);
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return 0;
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cleanup:
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vmbus_connection.conn_state = DISCONNECTED;
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if (vmbus_connection.work_queue)
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destroy_workqueue(vmbus_connection.work_queue);
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if (vmbus_connection.int_page) {
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free_pages((unsigned long)vmbus_connection.int_page, 0);
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vmbus_connection.int_page = NULL;
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}
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if (vmbus_connection.monitor_pages) {
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free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
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vmbus_connection.monitor_pages = NULL;
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}
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kfree(msginfo);
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return ret;
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}
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/*
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* relid2channel - Get the channel object given its
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* child relative id (ie channel id)
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*/
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struct vmbus_channel *relid2channel(u32 relid)
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{
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struct vmbus_channel *channel;
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struct vmbus_channel *found_channel = NULL;
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unsigned long flags;
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spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
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list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
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if (channel->offermsg.child_relid == relid) {
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found_channel = channel;
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break;
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}
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}
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spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
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return found_channel;
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}
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/*
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* process_chn_event - Process a channel event notification
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*/
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static void process_chn_event(u32 relid)
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{
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struct vmbus_channel *channel;
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unsigned long flags;
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/*
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* Find the channel based on this relid and invokes the
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* channel callback to process the event
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*/
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channel = relid2channel(relid);
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if (!channel) {
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pr_err("channel not found for relid - %u\n", relid);
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return;
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}
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/*
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* A channel once created is persistent even when there
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* is no driver handling the device. An unloading driver
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* sets the onchannel_callback to NULL under the
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* protection of the channel inbound_lock. Thus, checking
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* and invoking the driver specific callback takes care of
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* orderly unloading of the driver.
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*/
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spin_lock_irqsave(&channel->inbound_lock, flags);
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if (channel->onchannel_callback != NULL)
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channel->onchannel_callback(channel->channel_callback_context);
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else
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pr_err("no channel callback for relid - %u\n", relid);
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spin_unlock_irqrestore(&channel->inbound_lock, flags);
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}
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/*
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* vmbus_on_event - Handler for events
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*/
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void vmbus_on_event(unsigned long data)
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{
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u32 dword;
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u32 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
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int bit;
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u32 relid;
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u32 *recv_int_page = vmbus_connection.recv_int_page;
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/* Check events */
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if (!recv_int_page)
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return;
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for (dword = 0; dword < maxdword; dword++) {
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if (!recv_int_page[dword])
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continue;
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for (bit = 0; bit < 32; bit++) {
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if (sync_test_and_clear_bit(bit,
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(unsigned long *)&recv_int_page[dword])) {
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relid = (dword << 5) + bit;
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if (relid == 0)
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/*
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* Special case - vmbus
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* channel protocol msg
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*/
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continue;
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process_chn_event(relid);
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}
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}
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}
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}
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/*
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* vmbus_post_msg - Send a msg on the vmbus's message connection
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*/
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int vmbus_post_msg(void *buffer, size_t buflen)
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{
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union hv_connection_id conn_id;
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int ret = 0;
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int retries = 0;
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conn_id.asu32 = 0;
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conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
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/*
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* hv_post_message() can have transient failures because of
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* insufficient resources. Retry the operation a couple of
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* times before giving up.
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*/
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while (retries < 3) {
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ret = hv_post_message(conn_id, 1, buffer, buflen);
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if (ret != HV_STATUS_INSUFFICIENT_BUFFERS)
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return ret;
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retries++;
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msleep(100);
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}
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return ret;
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}
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/*
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* vmbus_set_event - Send an event notification to the parent
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*/
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int vmbus_set_event(u32 child_relid)
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{
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/* Each u32 represents 32 channels */
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sync_set_bit(child_relid & 31,
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(unsigned long *)vmbus_connection.send_int_page +
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(child_relid >> 5));
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return hv_signal_event();
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}
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