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Diffstat (limited to 'drivers/staging/hv/connection.c')
-rw-r--r--drivers/staging/hv/connection.c328
1 files changed, 0 insertions, 328 deletions
diff --git a/drivers/staging/hv/connection.c b/drivers/staging/hv/connection.c
deleted file mode 100644
index 37bbf770ef1..00000000000
--- a/drivers/staging/hv/connection.c
+++ /dev/null
@@ -1,328 +0,0 @@
-/*
- *
- * Copyright (c) 2009, Microsoft Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License along with
- * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
- * Place - Suite 330, Boston, MA 02111-1307 USA.
- *
- * Authors:
- * Haiyang Zhang <haiyangz@microsoft.com>
- * Hank Janssen <hjanssen@microsoft.com>
- *
- */
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/wait.h>
-#include <linux/mm.h>
-#include <linux/slab.h>
-#include <linux/vmalloc.h>
-
-#include "hyperv.h"
-#include "hyperv_vmbus.h"
-
-
-struct vmbus_connection vmbus_connection = {
- .conn_state = DISCONNECTED,
- .next_gpadl_handle = ATOMIC_INIT(0xE1E10),
-};
-
-/*
- * vmbus_connect - Sends a connect request on the partition service connection
- */
-int vmbus_connect(void)
-{
- int ret = 0;
- int t;
- struct vmbus_channel_msginfo *msginfo = NULL;
- struct vmbus_channel_initiate_contact *msg;
- unsigned long flags;
-
- /* Make sure we are not connecting or connected */
- if (vmbus_connection.conn_state != DISCONNECTED)
- return -1;
-
- /* Initialize the vmbus connection */
- vmbus_connection.conn_state = CONNECTING;
- vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
- if (!vmbus_connection.work_queue) {
- ret = -1;
- goto cleanup;
- }
-
- INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
- spin_lock_init(&vmbus_connection.channelmsg_lock);
-
- INIT_LIST_HEAD(&vmbus_connection.chn_list);
- spin_lock_init(&vmbus_connection.channel_lock);
-
- /*
- * Setup the vmbus event connection for channel interrupt
- * abstraction stuff
- */
- vmbus_connection.int_page =
- (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
- if (vmbus_connection.int_page == NULL) {
- ret = -1;
- goto cleanup;
- }
-
- vmbus_connection.recv_int_page = vmbus_connection.int_page;
- vmbus_connection.send_int_page =
- (void *)((unsigned long)vmbus_connection.int_page +
- (PAGE_SIZE >> 1));
-
- /*
- * Setup the monitor notification facility. The 1st page for
- * parent->child and the 2nd page for child->parent
- */
- vmbus_connection.monitor_pages =
- (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1);
- if (vmbus_connection.monitor_pages == NULL) {
- ret = -1;
- goto cleanup;
- }
-
- msginfo = kzalloc(sizeof(*msginfo) +
- sizeof(struct vmbus_channel_initiate_contact),
- GFP_KERNEL);
- if (msginfo == NULL) {
- ret = -ENOMEM;
- goto cleanup;
- }
-
- init_completion(&msginfo->waitevent);
-
- msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
-
- msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
- msg->vmbus_version_requested = VMBUS_REVISION_NUMBER;
- msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
- msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages);
- msg->monitor_page2 = virt_to_phys(
- (void *)((unsigned long)vmbus_connection.monitor_pages +
- PAGE_SIZE));
-
- /*
- * Add to list before we send the request since we may
- * receive the response before returning from this routine
- */
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
- list_add_tail(&msginfo->msglistentry,
- &vmbus_connection.chn_msg_list);
-
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
-
- ret = vmbus_post_msg(msg,
- sizeof(struct vmbus_channel_initiate_contact));
- if (ret != 0) {
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
- list_del(&msginfo->msglistentry);
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
- flags);
- goto cleanup;
- }
-
- /* Wait for the connection response */
- t = wait_for_completion_timeout(&msginfo->waitevent, HZ);
- if (t == 0) {
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock,
- flags);
- list_del(&msginfo->msglistentry);
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
- flags);
- ret = -ETIMEDOUT;
- goto cleanup;
- }
-
- spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
- list_del(&msginfo->msglistentry);
- spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
-
- /* Check if successful */
- if (msginfo->response.version_response.version_supported) {
- vmbus_connection.conn_state = CONNECTED;
- } else {
- pr_err("Unable to connect, "
- "Version %d not supported by Hyper-V\n",
- VMBUS_REVISION_NUMBER);
- ret = -1;
- goto cleanup;
- }
-
- kfree(msginfo);
- return 0;
-
-cleanup:
- vmbus_connection.conn_state = DISCONNECTED;
-
- if (vmbus_connection.work_queue)
- destroy_workqueue(vmbus_connection.work_queue);
-
- if (vmbus_connection.int_page) {
- free_pages((unsigned long)vmbus_connection.int_page, 0);
- vmbus_connection.int_page = NULL;
- }
-
- if (vmbus_connection.monitor_pages) {
- free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
- vmbus_connection.monitor_pages = NULL;
- }
-
- kfree(msginfo);
-
- return ret;
-}
-
-/*
- * vmbus_disconnect -
- * Sends a disconnect request on the partition service connection
- */
-int vmbus_disconnect(void)
-{
- int ret = 0;
- struct vmbus_channel_message_header *msg;
-
- /* Make sure we are connected */
- if (vmbus_connection.conn_state != CONNECTED)
- return -1;
-
- msg = kzalloc(sizeof(struct vmbus_channel_message_header), GFP_KERNEL);
- if (!msg)
- return -ENOMEM;
-
- msg->msgtype = CHANNELMSG_UNLOAD;
-
- ret = vmbus_post_msg(msg,
- sizeof(struct vmbus_channel_message_header));
- if (ret != 0)
- goto cleanup;
-
- free_pages((unsigned long)vmbus_connection.int_page, 0);
- free_pages((unsigned long)vmbus_connection.monitor_pages, 1);
-
- /* TODO: iterate thru the msg list and free up */
- destroy_workqueue(vmbus_connection.work_queue);
-
- vmbus_connection.conn_state = DISCONNECTED;
-
- pr_info("hv_vmbus disconnected\n");
-
-cleanup:
- kfree(msg);
- return ret;
-}
-
-/*
- * relid2channel - Get the channel object given its
- * child relative id (ie channel id)
- */
-struct vmbus_channel *relid2channel(u32 relid)
-{
- struct vmbus_channel *channel;
- struct vmbus_channel *found_channel = NULL;
- unsigned long flags;
-
- spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
- list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
- if (channel->offermsg.child_relid == relid) {
- found_channel = channel;
- break;
- }
- }
- spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
-
- return found_channel;
-}
-
-/*
- * process_chn_event - Process a channel event notification
- */
-static void process_chn_event(u32 relid)
-{
- struct vmbus_channel *channel;
-
- /* ASSERT(relId > 0); */
-
- /*
- * Find the channel based on this relid and invokes the
- * channel callback to process the event
- */
- channel = relid2channel(relid);
-
- if (channel) {
- vmbus_onchannel_event(channel);
- } else {
- pr_err("channel not found for relid - %u\n", relid);
- }
-}
-
-/*
- * vmbus_on_event - Handler for events
- */
-void vmbus_on_event(unsigned long data)
-{
- u32 dword;
- u32 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
- int bit;
- u32 relid;
- u32 *recv_int_page = vmbus_connection.recv_int_page;
-
- /* Check events */
- if (!recv_int_page)
- return;
- for (dword = 0; dword < maxdword; dword++) {
- if (!recv_int_page[dword])
- continue;
- for (bit = 0; bit < 32; bit++) {
- if (sync_test_and_clear_bit(bit, (unsigned long *)&recv_int_page[dword])) {
- relid = (dword << 5) + bit;
-
- if (relid == 0) {
- /*
- * Special case - vmbus
- * channel protocol msg
- */
- continue;
- }
- process_chn_event(relid);
- }
- }
- }
-}
-
-/*
- * vmbus_post_msg - Send a msg on the vmbus's message connection
- */
-int vmbus_post_msg(void *buffer, size_t buflen)
-{
- union hv_connection_id conn_id;
-
- conn_id.asu32 = 0;
- conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
- return hv_post_message(conn_id, 1, buffer, buflen);
-}
-
-/*
- * vmbus_set_event - Send an event notification to the parent
- */
-int vmbus_set_event(u32 child_relid)
-{
- /* Each u32 represents 32 channels */
- sync_set_bit(child_relid & 31,
- (unsigned long *)vmbus_connection.send_int_page +
- (child_relid >> 5));
-
- return hv_signal_event();
-}
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