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Hank Janssen3e7ee492009-07-13 16:02:34 -07001/*
Hank Janssen3e7ee492009-07-13 16:02:34 -07002 * Copyright (c) 2009, Microsoft Corporation.
3 *
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
7 *
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
11 * more details.
12 *
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
16 *
17 * Authors:
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
Hank Janssen3e7ee492009-07-13 16:02:34 -070020 */
Hank Janssen0a466182011-03-29 13:58:47 -070021#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
22
Greg Kroah-Hartmana0086dc2009-08-17 17:22:08 -070023#include <linux/kernel.h>
K. Y. Srinivasan0c3b7b22011-02-11 09:59:43 -080024#include <linux/sched.h>
25#include <linux/wait.h>
Greg Kroah-Hartmana0086dc2009-08-17 17:22:08 -070026#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090027#include <linux/slab.h>
Bill Pemberton53af5452009-09-11 21:46:44 -040028#include <linux/list.h>
Hank Janssenc88c4e42010-05-04 15:55:05 -070029#include <linux/module.h>
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +000030#include <linux/completion.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070031#include <linux/hyperv.h>
K. Y. Srinivasan3f335ea2011-05-12 19:34:15 -070032
K. Y. Srinivasan0f2a6612011-05-12 19:34:28 -070033#include "hyperv_vmbus.h"
Hank Janssen3e7ee492009-07-13 16:02:34 -070034
Greg Kroah-Hartman1d7e9072009-08-28 16:26:11 -070035struct vmbus_channel_message_table_entry {
K. Y. Srinivasancf9dcba2011-05-10 07:55:37 -070036 enum vmbus_channel_message_type message_type;
K. Y. Srinivasanfa90f1d2011-05-10 07:55:36 -070037 void (*message_handler)(struct vmbus_channel_message_header *msg);
Greg Kroah-Hartman1d7e9072009-08-28 16:26:11 -070038};
Hank Janssen3e7ee492009-07-13 16:02:34 -070039
Hank Janssenc88c4e42010-05-04 15:55:05 -070040
41/**
Greg Kroah-Hartmanda0e9632011-10-11 08:42:28 -060042 * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message
Hank Janssenc88c4e42010-05-04 15:55:05 -070043 * @icmsghdrp: Pointer to msg header structure
44 * @icmsg_negotiate: Pointer to negotiate message structure
45 * @buf: Raw buffer channel data
46 *
47 * @icmsghdrp is of type &struct icmsg_hdr.
48 * @negop is of type &struct icmsg_negotiate.
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -070049 * Set up and fill in default negotiate response message.
50 *
K. Y. Srinivasan67413352013-07-02 10:31:30 -070051 * The fw_version specifies the framework version that
52 * we can support and srv_version specifies the service
53 * version we can support.
Hank Janssenc88c4e42010-05-04 15:55:05 -070054 *
55 * Mainly used by Hyper-V drivers.
56 */
K. Y. Srinivasan67413352013-07-02 10:31:30 -070057bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp,
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -070058 struct icmsg_negotiate *negop, u8 *buf,
K. Y. Srinivasan67413352013-07-02 10:31:30 -070059 int fw_version, int srv_version)
Hank Janssenc88c4e42010-05-04 15:55:05 -070060{
K. Y. Srinivasan67413352013-07-02 10:31:30 -070061 int icframe_major, icframe_minor;
62 int icmsg_major, icmsg_minor;
63 int fw_major, fw_minor;
64 int srv_major, srv_minor;
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -070065 int i;
K. Y. Srinivasan67413352013-07-02 10:31:30 -070066 bool found_match = false;
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -070067
K. Y. Srinivasana3605302012-05-12 13:44:57 -070068 icmsghdrp->icmsgsize = 0x10;
K. Y. Srinivasan67413352013-07-02 10:31:30 -070069 fw_major = (fw_version >> 16);
70 fw_minor = (fw_version & 0xFFFF);
71
72 srv_major = (srv_version >> 16);
73 srv_minor = (srv_version & 0xFFFF);
Hank Janssenc88c4e42010-05-04 15:55:05 -070074
K. Y. Srinivasana3605302012-05-12 13:44:57 -070075 negop = (struct icmsg_negotiate *)&buf[
76 sizeof(struct vmbuspipe_hdr) +
77 sizeof(struct icmsg_hdr)];
Hank Janssenc88c4e42010-05-04 15:55:05 -070078
K. Y. Srinivasan67413352013-07-02 10:31:30 -070079 icframe_major = negop->icframe_vercnt;
80 icframe_minor = 0;
81
82 icmsg_major = negop->icmsg_vercnt;
83 icmsg_minor = 0;
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -070084
85 /*
86 * Select the framework version number we will
87 * support.
88 */
89
90 for (i = 0; i < negop->icframe_vercnt; i++) {
K. Y. Srinivasan67413352013-07-02 10:31:30 -070091 if ((negop->icversion_data[i].major == fw_major) &&
92 (negop->icversion_data[i].minor == fw_minor)) {
93 icframe_major = negop->icversion_data[i].major;
94 icframe_minor = negop->icversion_data[i].minor;
95 found_match = true;
96 }
Hank Janssenc88c4e42010-05-04 15:55:05 -070097 }
K. Y. Srinivasana3605302012-05-12 13:44:57 -070098
K. Y. Srinivasan67413352013-07-02 10:31:30 -070099 if (!found_match)
100 goto fw_error;
101
102 found_match = false;
103
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -0700104 for (i = negop->icframe_vercnt;
105 (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) {
K. Y. Srinivasan67413352013-07-02 10:31:30 -0700106 if ((negop->icversion_data[i].major == srv_major) &&
107 (negop->icversion_data[i].minor == srv_minor)) {
108 icmsg_major = negop->icversion_data[i].major;
109 icmsg_minor = negop->icversion_data[i].minor;
110 found_match = true;
111 }
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -0700112 }
113
114 /*
K. Y. Srinivasan67413352013-07-02 10:31:30 -0700115 * Respond with the framework and service
K. Y. Srinivasanc836d0a2012-05-12 13:44:58 -0700116 * version numbers we can support.
117 */
K. Y. Srinivasan67413352013-07-02 10:31:30 -0700118
119fw_error:
120 if (!found_match) {
121 negop->icframe_vercnt = 0;
122 negop->icmsg_vercnt = 0;
123 } else {
124 negop->icframe_vercnt = 1;
125 negop->icmsg_vercnt = 1;
126 }
127
128 negop->icversion_data[0].major = icframe_major;
129 negop->icversion_data[0].minor = icframe_minor;
130 negop->icversion_data[1].major = icmsg_major;
131 negop->icversion_data[1].minor = icmsg_minor;
132 return found_match;
Hank Janssenc88c4e42010-05-04 15:55:05 -0700133}
K. Y. Srinivasana3605302012-05-12 13:44:57 -0700134
Greg Kroah-Hartmanda0e9632011-10-11 08:42:28 -0600135EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp);
Hank Janssenc88c4e42010-05-04 15:55:05 -0700136
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800137static void vmbus_process_device_unregister(struct work_struct *work)
138{
139 struct device *dev;
140 struct vmbus_channel *channel = container_of(work,
141 struct vmbus_channel,
142 work);
143
144 dev = get_device(&channel->device_obj->device);
145 if (dev) {
146 vmbus_device_unregister(channel->device_obj);
147 put_device(dev);
148 }
149}
150
151static void vmbus_sc_creation_cb(struct work_struct *work)
152{
153 struct vmbus_channel *newchannel = container_of(work,
154 struct vmbus_channel,
155 work);
156 struct vmbus_channel *primary_channel = newchannel->primary_channel;
157
158 /*
159 * On entry sc_creation_callback has been already verified to
160 * be non-NULL.
161 */
162 primary_channel->sc_creation_callback(newchannel);
163}
164
Hank Janssen3e189512010-03-04 22:11:00 +0000165/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700166 * alloc_channel - Allocate and initialize a vmbus channel object
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700167 */
Greg Kroah-Hartman50fe56d2010-10-20 15:51:57 -0700168static struct vmbus_channel *alloc_channel(void)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700169{
Vitaly Kuznetsovbc63b6f2015-02-27 11:25:52 -0800170 static atomic_t chan_num = ATOMIC_INIT(0);
Greg Kroah-Hartmanaded7162009-08-18 15:21:19 -0700171 struct vmbus_channel *channel;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700172
Greg Kroah-Hartmanaded7162009-08-18 15:21:19 -0700173 channel = kzalloc(sizeof(*channel), GFP_ATOMIC);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700174 if (!channel)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700175 return NULL;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700176
Vitaly Kuznetsovbc63b6f2015-02-27 11:25:52 -0800177 channel->id = atomic_inc_return(&chan_num);
Greg Kroah-Hartman54411c42009-07-15 14:48:32 -0700178 spin_lock_init(&channel->inbound_lock);
Vitaly Kuznetsov67fae052015-01-20 16:45:05 +0100179 spin_lock_init(&channel->lock);
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700180
181 INIT_LIST_HEAD(&channel->sc_list);
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700182 INIT_LIST_HEAD(&channel->percpu_list);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700183
Vitaly Kuznetsovbc63b6f2015-02-27 11:25:52 -0800184 channel->controlwq = alloc_workqueue("hv_vmbus_ctl/%d", WQ_MEM_RECLAIM,
185 1, channel->id);
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800186 if (!channel->controlwq) {
Greg Kroah-Hartman8c69f522009-07-15 12:48:29 -0700187 kfree(channel);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700188 return NULL;
189 }
190
191 return channel;
192}
193
Hank Janssen3e189512010-03-04 22:11:00 +0000194/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700195 * release_hannel - Release the vmbus channel object itself
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700196 */
Timo Teräs4b2f9ab2010-12-15 20:48:09 +0200197static void release_channel(struct work_struct *work)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700198{
Timo Teräs4b2f9ab2010-12-15 20:48:09 +0200199 struct vmbus_channel *channel = container_of(work,
200 struct vmbus_channel,
201 work);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700202
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800203 destroy_workqueue(channel->controlwq);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700204
Greg Kroah-Hartman8c69f522009-07-15 12:48:29 -0700205 kfree(channel);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700206}
207
Hank Janssen3e189512010-03-04 22:11:00 +0000208/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700209 * free_channel - Release the resources used by the vmbus channel object
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700210 */
Greg Kroah-Hartman9f3e28e2011-10-11 09:40:01 -0600211static void free_channel(struct vmbus_channel *channel)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700212{
Hank Janssen3e7ee492009-07-13 16:02:34 -0700213
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700214 /*
215 * We have to release the channel's workqueue/thread in the vmbus's
216 * workqueue/thread context
217 * ie we can't destroy ourselves.
218 */
Timo Teräs4b2f9ab2010-12-15 20:48:09 +0200219 INIT_WORK(&channel->work, release_channel);
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800220 queue_work(vmbus_connection.work_queue, &channel->work);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700221}
222
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700223static void percpu_channel_enq(void *arg)
224{
225 struct vmbus_channel *channel = arg;
226 int cpu = smp_processor_id();
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +0000227
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700228 list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]);
229}
230
231static void percpu_channel_deq(void *arg)
232{
233 struct vmbus_channel *channel = arg;
234
235 list_del(&channel->percpu_list);
236}
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +0000237
K. Y. Srinivasaned6cfcc2015-02-28 11:18:17 -0800238
239void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid)
Timo Teräs4b2f9ab2010-12-15 20:48:09 +0200240{
K. Y. Srinivasaned6cfcc2015-02-28 11:18:17 -0800241 struct vmbus_channel_relid_released msg;
K. Y. Srinivasanc8705972013-03-15 12:25:44 -0700242 unsigned long flags;
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700243 struct vmbus_channel *primary_channel;
Vitaly Kuznetsov04a258c2014-11-04 13:40:11 +0100244
K. Y. Srinivasanc8705972013-03-15 12:25:44 -0700245 memset(&msg, 0, sizeof(struct vmbus_channel_relid_released));
K. Y. Srinivasaned6cfcc2015-02-28 11:18:17 -0800246 msg.child_relid = relid;
K. Y. Srinivasanc8705972013-03-15 12:25:44 -0700247 msg.header.msgtype = CHANNELMSG_RELID_RELEASED;
248 vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released));
249
K. Y. Srinivasaned6cfcc2015-02-28 11:18:17 -0800250 if (channel == NULL)
251 return;
252
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700253 if (channel->target_cpu != get_cpu()) {
254 put_cpu();
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700255 smp_call_function_single(channel->target_cpu,
256 percpu_channel_deq, channel, true);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700257 } else {
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700258 percpu_channel_deq(channel);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700259 put_cpu();
260 }
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700261
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700262 if (channel->primary_channel == NULL) {
263 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
264 list_del(&channel->listentry);
265 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
266 } else {
267 primary_channel = channel->primary_channel;
Vitaly Kuznetsov67fae052015-01-20 16:45:05 +0100268 spin_lock_irqsave(&primary_channel->lock, flags);
K. Y. Srinivasan565ce642013-10-16 19:27:19 -0700269 list_del(&channel->sc_list);
Vitaly Kuznetsov67fae052015-01-20 16:45:05 +0100270 spin_unlock_irqrestore(&primary_channel->lock, flags);
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700271 }
K. Y. Srinivasanc8705972013-03-15 12:25:44 -0700272 free_channel(channel);
Timo Teräs4b2f9ab2010-12-15 20:48:09 +0200273}
Haiyang Zhang8b5d6d32010-05-28 23:22:44 +0000274
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -0800275void vmbus_free_channels(void)
276{
277 struct vmbus_channel *channel;
278
279 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
280 vmbus_device_unregister(channel->device_obj);
K. Y. Srinivasan93e5bd02011-12-12 09:29:17 -0800281 free_channel(channel);
282 }
283}
284
Hank Janssen3e189512010-03-04 22:11:00 +0000285/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700286 * vmbus_process_offer - Process the offer by creating a channel/device
Hank Janssenc88c4e42010-05-04 15:55:05 -0700287 * associated with this offer
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700288 */
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800289static void vmbus_process_offer(struct vmbus_channel *newchannel)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700290{
Greg Kroah-Hartmanaded7162009-08-18 15:21:19 -0700291 struct vmbus_channel *channel;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700292 bool fnew = true;
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700293 bool enq = false;
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700294 int ret;
Greg Kroah-Hartman0f5e44c2009-07-15 14:57:16 -0700295 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700296
Bill Pemberton454f18a2009-07-27 16:47:24 -0400297 /* Make sure this is a new offer */
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800298 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700299
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800300 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
K. Y. Srinivasan358d2ee2011-08-25 09:48:28 -0700301 if (!uuid_le_cmp(channel->offermsg.offer.if_type,
302 newchannel->offermsg.offer.if_type) &&
303 !uuid_le_cmp(channel->offermsg.offer.if_instance,
304 newchannel->offermsg.offer.if_instance)) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700305 fnew = false;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700306 break;
307 }
308 }
309
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700310 if (fnew) {
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800311 list_add_tail(&newchannel->listentry,
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800312 &vmbus_connection.chn_list);
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700313 enq = true;
314 }
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700315
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800316 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700317
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700318 if (enq) {
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700319 if (newchannel->target_cpu != get_cpu()) {
320 put_cpu();
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700321 smp_call_function_single(newchannel->target_cpu,
322 percpu_channel_enq,
323 newchannel, true);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700324 } else {
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700325 percpu_channel_enq(newchannel);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700326 put_cpu();
327 }
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700328 }
Haiyang Zhang188963e2010-10-15 10:14:06 -0700329 if (!fnew) {
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700330 /*
331 * Check to see if this is a sub-channel.
332 */
333 if (newchannel->offermsg.offer.sub_channel_index != 0) {
334 /*
335 * Process the sub-channel.
336 */
337 newchannel->primary_channel = channel;
Vitaly Kuznetsov67fae052015-01-20 16:45:05 +0100338 spin_lock_irqsave(&channel->lock, flags);
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700339 list_add_tail(&newchannel->sc_list, &channel->sc_list);
Vitaly Kuznetsov67fae052015-01-20 16:45:05 +0100340 spin_unlock_irqrestore(&channel->lock, flags);
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700341
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700342 if (newchannel->target_cpu != get_cpu()) {
343 put_cpu();
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700344 smp_call_function_single(newchannel->target_cpu,
345 percpu_channel_enq,
346 newchannel, true);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700347 } else {
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700348 percpu_channel_enq(newchannel);
K. Y. Srinivasan2115b562014-08-28 18:29:53 -0700349 put_cpu();
350 }
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700351
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700352 newchannel->state = CHANNEL_OPEN_STATE;
353 if (channel->sc_creation_callback != NULL)
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800354 /*
355 * We need to invoke the sub-channel creation
356 * callback; invoke this in a seperate work
357 * context since we are currently running on
358 * the global work context in which we handle
359 * messages from the host.
360 */
361 INIT_WORK(&newchannel->work,
362 vmbus_sc_creation_cb);
363 queue_work(newchannel->controlwq,
364 &newchannel->work);
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700365
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800366 return;
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700367 }
368
Vitaly Kuznetsov9c3a6f72015-01-20 16:45:04 +0100369 goto err_free_chan;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700370 }
371
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700372 /*
K. Y. Srinivasan42dceeb2013-08-26 14:08:58 -0700373 * This state is used to indicate a successful open
374 * so that when we do close the channel normally, we
375 * can cleanup properly
376 */
377 newchannel->state = CHANNEL_OPEN_STATE;
378
379 /*
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700380 * Start the process of binding this offer to the driver
381 * We need to set the DeviceObject field before calling
Haiyang Zhang646f1ea2011-01-26 12:12:10 -0800382 * vmbus_child_dev_add()
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700383 */
K. Y. Srinivasanf2c73012011-09-08 07:24:12 -0700384 newchannel->device_obj = vmbus_device_create(
Haiyang Zhang767dff62011-01-26 12:12:12 -0800385 &newchannel->offermsg.offer.if_type,
386 &newchannel->offermsg.offer.if_instance,
Haiyang Zhang188963e2010-10-15 10:14:06 -0700387 newchannel);
Vitaly Kuznetsov9c3a6f72015-01-20 16:45:04 +0100388 if (!newchannel->device_obj)
389 goto err_free_chan;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700390
Bill Pemberton454f18a2009-07-27 16:47:24 -0400391 /*
392 * Add the new device to the bus. This will kick off device-driver
393 * binding which eventually invokes the device driver's AddDevice()
394 * method.
395 */
K. Y. Srinivasan227942812011-09-08 07:24:13 -0700396 ret = vmbus_device_register(newchannel->device_obj);
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700397 if (ret != 0) {
Hank Janssen0a466182011-03-29 13:58:47 -0700398 pr_err("unable to add child device object (relid %d)\n",
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800399 newchannel->offermsg.child_relid);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700400
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800401 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800402 list_del(&newchannel->listentry);
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800403 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
K. Y. Srinivasan8b8ee672011-12-12 09:29:16 -0800404 kfree(newchannel->device_obj);
Vitaly Kuznetsov9c3a6f72015-01-20 16:45:04 +0100405 goto err_free_chan;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700406 }
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800407
Vitaly Kuznetsov9c3a6f72015-01-20 16:45:04 +0100408 return;
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800409
Vitaly Kuznetsov9c3a6f72015-01-20 16:45:04 +0100410err_free_chan:
411 free_channel(newchannel);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700412}
413
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800414enum {
415 IDE = 0,
416 SCSI,
417 NIC,
418 MAX_PERF_CHN,
419};
420
421/*
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800422 * This is an array of device_ids (device types) that are performance critical.
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800423 * We attempt to distribute the interrupt load for these devices across
424 * all available CPUs.
425 */
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800426static const struct hv_vmbus_device_id hp_devs[] = {
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800427 /* IDE */
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800428 { HV_IDE_GUID, },
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800429 /* Storage - SCSI */
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800430 { HV_SCSI_GUID, },
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800431 /* Network */
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800432 { HV_NIC_GUID, },
K. Y. Srinivasan04653a02015-02-27 11:26:05 -0800433 /* NetworkDirect Guest RDMA */
434 { HV_ND_GUID, },
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800435};
436
437
438/*
439 * We use this state to statically distribute the channel interrupt load.
440 */
441static u32 next_vp;
442
443/*
444 * Starting with Win8, we can statically distribute the incoming
445 * channel interrupt load by binding a channel to VCPU. We
446 * implement here a simple round robin scheme for distributing
447 * the interrupt load.
448 * We will bind channels that are not performance critical to cpu 0 and
449 * performance critical channels (IDE, SCSI and Network) will be uniformly
450 * distributed across all available CPUs.
451 */
Linus Torvaldsf9da4552014-06-12 14:27:40 -0700452static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid)
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800453{
454 u32 cur_cpu;
455 int i;
456 bool perf_chn = false;
457 u32 max_cpus = num_online_cpus();
458
459 for (i = IDE; i < MAX_PERF_CHN; i++) {
K. Y. Srinivasan7fb96562013-01-23 17:42:40 -0800460 if (!memcmp(type_guid->b, hp_devs[i].guid,
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800461 sizeof(uuid_le))) {
462 perf_chn = true;
463 break;
464 }
465 }
466 if ((vmbus_proto_version == VERSION_WS2008) ||
467 (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) {
468 /*
469 * Prior to win8, all channel interrupts are
470 * delivered on cpu 0.
471 * Also if the channel is not a performance critical
472 * channel, bind it to cpu 0.
473 */
K. Y. Srinivasand3ba7202014-04-08 18:45:53 -0700474 channel->target_cpu = 0;
475 channel->target_vp = 0;
476 return;
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800477 }
478 cur_cpu = (++next_vp % max_cpus);
K. Y. Srinivasand3ba7202014-04-08 18:45:53 -0700479 channel->target_cpu = cur_cpu;
480 channel->target_vp = hv_context.vp_index[cur_cpu];
K. Y. Srinivasana1198452012-12-01 06:46:50 -0800481}
482
Hank Janssen3e189512010-03-04 22:11:00 +0000483/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700484 * vmbus_onoffer - Handler for channel offers from vmbus in parent partition.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700485 *
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700486 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700487static void vmbus_onoffer(struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700488{
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700489 struct vmbus_channel_offer_channel *offer;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700490 struct vmbus_channel *newchannel;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700491
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700492 offer = (struct vmbus_channel_offer_channel *)hdr;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700493
Bill Pemberton454f18a2009-07-27 16:47:24 -0400494 /* Allocate the channel object and save this offer. */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700495 newchannel = alloc_channel();
Haiyang Zhang188963e2010-10-15 10:14:06 -0700496 if (!newchannel) {
Hank Janssen0a466182011-03-29 13:58:47 -0700497 pr_err("Unable to allocate channel object\n");
Hank Janssen3e7ee492009-07-13 16:02:34 -0700498 return;
499 }
500
K. Y. Srinivasan132368b2012-12-01 06:46:33 -0800501 /*
502 * By default we setup state to enable batched
503 * reading. A specific service can choose to
504 * disable this prior to opening the channel.
505 */
506 newchannel->batched_reading = true;
507
K. Y. Srinivasanb3bf60c2012-12-01 06:46:45 -0800508 /*
509 * Setup state for signalling the host.
510 */
511 newchannel->sig_event = (struct hv_input_signal_event *)
512 (ALIGN((unsigned long)
513 &newchannel->sig_buf,
514 HV_HYPERCALL_PARAM_ALIGN));
515
516 newchannel->sig_event->connectionid.asu32 = 0;
517 newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID;
518 newchannel->sig_event->flag_number = 0;
519 newchannel->sig_event->rsvdz = 0;
520
521 if (vmbus_proto_version != VERSION_WS2008) {
522 newchannel->is_dedicated_interrupt =
523 (offer->is_dedicated_interrupt != 0);
524 newchannel->sig_event->connectionid.u.id =
525 offer->connection_id;
526 }
527
K. Y. Srinivasand3ba7202014-04-08 18:45:53 -0700528 init_vp_index(newchannel, &offer->offer.if_type);
K. Y. Srinivasanabbf3b22012-12-01 06:46:48 -0800529
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800530 memcpy(&newchannel->offermsg, offer,
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700531 sizeof(struct vmbus_channel_offer_channel));
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800532 newchannel->monitor_grp = (u8)offer->monitorid / 32;
533 newchannel->monitor_bit = (u8)offer->monitorid % 32;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700534
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800535 vmbus_process_offer(newchannel);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700536}
537
Hank Janssen3e189512010-03-04 22:11:00 +0000538/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700539 * vmbus_onoffer_rescind - Rescind offer handler.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700540 *
541 * We queue a work item to process this offer synchronously
542 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700543static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700544{
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700545 struct vmbus_channel_rescind_offer *rescind;
Greg Kroah-Hartmanaded7162009-08-18 15:21:19 -0700546 struct vmbus_channel *channel;
Vitaly Kuznetsovd7f2fba2015-01-20 16:45:06 +0100547 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700548
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700549 rescind = (struct vmbus_channel_rescind_offer *)hdr;
Haiyang Zhangc6977672011-01-26 12:12:08 -0800550 channel = relid2channel(rescind->child_relid);
Hank Janssen98e08702011-03-29 13:58:44 -0700551
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800552 if (channel == NULL) {
553 hv_process_channel_removal(NULL, rescind->child_relid);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700554 return;
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800555 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700556
Vitaly Kuznetsovd7f2fba2015-01-20 16:45:06 +0100557 spin_lock_irqsave(&channel->lock, flags);
Haiyang Zhangc3582a22014-12-01 13:28:39 -0800558 channel->rescind = true;
Vitaly Kuznetsovd7f2fba2015-01-20 16:45:06 +0100559 spin_unlock_irqrestore(&channel->lock, flags);
K. Y. Srinivasan2dd37cb2015-02-28 11:18:18 -0800560
561 if (channel->device_obj) {
562 /*
563 * We will have to unregister this device from the
564 * driver core. Do this in the per-channel work context.
565 * Note that we are currently executing on the global
566 * workq for handling messages from the host.
567 */
568 INIT_WORK(&channel->work, vmbus_process_device_unregister);
569 queue_work(channel->controlwq, &channel->work);
570 } else {
571 hv_process_channel_removal(channel,
572 channel->offermsg.child_relid);
573 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700574}
575
Hank Janssen3e189512010-03-04 22:11:00 +0000576/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700577 * vmbus_onoffers_delivered -
578 * This is invoked when all offers have been delivered.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700579 *
580 * Nothing to do here.
581 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700582static void vmbus_onoffers_delivered(
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700583 struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700584{
Hank Janssen3e7ee492009-07-13 16:02:34 -0700585}
586
Hank Janssen3e189512010-03-04 22:11:00 +0000587/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700588 * vmbus_onopen_result - Open result handler.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700589 *
590 * This is invoked when we received a response to our channel open request.
591 * Find the matching request, copy the response and signal the requesting
592 * thread.
593 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700594static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700595{
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700596 struct vmbus_channel_open_result *result;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700597 struct vmbus_channel_msginfo *msginfo;
598 struct vmbus_channel_message_header *requestheader;
599 struct vmbus_channel_open_channel *openmsg;
Greg Kroah-Hartmandd0813b2009-07-15 14:56:45 -0700600 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700601
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700602 result = (struct vmbus_channel_open_result *)hdr;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700603
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700604 /*
605 * Find the open msg, copy the result and signal/unblock the wait event
606 */
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800607 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700608
Hank Janssenebb61e52011-02-18 12:39:57 -0800609 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
610 msglistentry) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700611 requestheader =
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800612 (struct vmbus_channel_message_header *)msginfo->msg;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700613
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800614 if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700615 openmsg =
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800616 (struct vmbus_channel_open_channel *)msginfo->msg;
617 if (openmsg->child_relid == result->child_relid &&
618 openmsg->openid == result->openid) {
619 memcpy(&msginfo->response.open_result,
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700620 result,
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700621 sizeof(
622 struct vmbus_channel_open_result));
623 complete(&msginfo->waitevent);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700624 break;
625 }
626 }
627 }
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800628 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700629}
630
Hank Janssen3e189512010-03-04 22:11:00 +0000631/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700632 * vmbus_ongpadl_created - GPADL created handler.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700633 *
634 * This is invoked when we received a response to our gpadl create request.
635 * Find the matching request, copy the response and signal the requesting
636 * thread.
637 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700638static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700639{
Haiyang Zhang188963e2010-10-15 10:14:06 -0700640 struct vmbus_channel_gpadl_created *gpadlcreated;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700641 struct vmbus_channel_msginfo *msginfo;
642 struct vmbus_channel_message_header *requestheader;
643 struct vmbus_channel_gpadl_header *gpadlheader;
Greg Kroah-Hartmandd0813b2009-07-15 14:56:45 -0700644 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700645
Haiyang Zhang188963e2010-10-15 10:14:06 -0700646 gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700647
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700648 /*
649 * Find the establish msg, copy the result and signal/unblock the wait
650 * event
651 */
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800652 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700653
Hank Janssenebb61e52011-02-18 12:39:57 -0800654 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
655 msglistentry) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700656 requestheader =
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800657 (struct vmbus_channel_message_header *)msginfo->msg;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700658
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800659 if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700660 gpadlheader =
661 (struct vmbus_channel_gpadl_header *)requestheader;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700662
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800663 if ((gpadlcreated->child_relid ==
664 gpadlheader->child_relid) &&
665 (gpadlcreated->gpadl == gpadlheader->gpadl)) {
666 memcpy(&msginfo->response.gpadl_created,
Haiyang Zhang188963e2010-10-15 10:14:06 -0700667 gpadlcreated,
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700668 sizeof(
669 struct vmbus_channel_gpadl_created));
670 complete(&msginfo->waitevent);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700671 break;
672 }
673 }
674 }
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800675 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700676}
677
Hank Janssen3e189512010-03-04 22:11:00 +0000678/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700679 * vmbus_ongpadl_torndown - GPADL torndown handler.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700680 *
681 * This is invoked when we received a response to our gpadl teardown request.
682 * Find the matching request, copy the response and signal the requesting
683 * thread.
684 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700685static void vmbus_ongpadl_torndown(
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700686 struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700687{
Haiyang Zhang188963e2010-10-15 10:14:06 -0700688 struct vmbus_channel_gpadl_torndown *gpadl_torndown;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700689 struct vmbus_channel_msginfo *msginfo;
690 struct vmbus_channel_message_header *requestheader;
691 struct vmbus_channel_gpadl_teardown *gpadl_teardown;
Greg Kroah-Hartmandd0813b2009-07-15 14:56:45 -0700692 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700693
Haiyang Zhang188963e2010-10-15 10:14:06 -0700694 gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr;
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700695
696 /*
697 * Find the open msg, copy the result and signal/unblock the wait event
698 */
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800699 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700700
Hank Janssenebb61e52011-02-18 12:39:57 -0800701 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
702 msglistentry) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700703 requestheader =
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800704 (struct vmbus_channel_message_header *)msginfo->msg;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700705
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800706 if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700707 gpadl_teardown =
708 (struct vmbus_channel_gpadl_teardown *)requestheader;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700709
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800710 if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) {
711 memcpy(&msginfo->response.gpadl_torndown,
Haiyang Zhang188963e2010-10-15 10:14:06 -0700712 gpadl_torndown,
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700713 sizeof(
714 struct vmbus_channel_gpadl_torndown));
715 complete(&msginfo->waitevent);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700716 break;
717 }
718 }
719 }
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800720 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700721}
722
Hank Janssen3e189512010-03-04 22:11:00 +0000723/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700724 * vmbus_onversion_response - Version response handler
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700725 *
726 * This is invoked when we received a response to our initiate contact request.
727 * Find the matching request, copy the response and signal the requesting
728 * thread.
729 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700730static void vmbus_onversion_response(
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700731 struct vmbus_channel_message_header *hdr)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700732{
Haiyang Zhang188963e2010-10-15 10:14:06 -0700733 struct vmbus_channel_msginfo *msginfo;
734 struct vmbus_channel_message_header *requestheader;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700735 struct vmbus_channel_version_response *version_response;
Greg Kroah-Hartmandd0813b2009-07-15 14:56:45 -0700736 unsigned long flags;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700737
Haiyang Zhang188963e2010-10-15 10:14:06 -0700738 version_response = (struct vmbus_channel_version_response *)hdr;
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800739 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700740
Hank Janssenebb61e52011-02-18 12:39:57 -0800741 list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list,
742 msglistentry) {
Haiyang Zhang188963e2010-10-15 10:14:06 -0700743 requestheader =
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800744 (struct vmbus_channel_message_header *)msginfo->msg;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700745
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800746 if (requestheader->msgtype ==
747 CHANNELMSG_INITIATE_CONTACT) {
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800748 memcpy(&msginfo->response.version_response,
Haiyang Zhang188963e2010-10-15 10:14:06 -0700749 version_response,
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700750 sizeof(struct vmbus_channel_version_response));
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700751 complete(&msginfo->waitevent);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700752 }
753 }
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800754 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700755}
756
Greg Kroah-Hartmanc8212f02009-08-31 21:51:50 -0700757/* Channel message dispatch table */
758static struct vmbus_channel_message_table_entry
K. Y. Srinivasanb7c6b022011-05-10 07:55:38 -0700759 channel_message_table[CHANNELMSG_COUNT] = {
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800760 {CHANNELMSG_INVALID, NULL},
761 {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer},
762 {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind},
763 {CHANNELMSG_REQUESTOFFERS, NULL},
764 {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered},
765 {CHANNELMSG_OPENCHANNEL, NULL},
766 {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result},
767 {CHANNELMSG_CLOSECHANNEL, NULL},
768 {CHANNELMSG_GPADL_HEADER, NULL},
769 {CHANNELMSG_GPADL_BODY, NULL},
770 {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created},
771 {CHANNELMSG_GPADL_TEARDOWN, NULL},
772 {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown},
773 {CHANNELMSG_RELID_RELEASED, NULL},
774 {CHANNELMSG_INITIATE_CONTACT, NULL},
775 {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response},
776 {CHANNELMSG_UNLOAD, NULL},
Greg Kroah-Hartmanc8212f02009-08-31 21:51:50 -0700777};
778
Hank Janssen3e189512010-03-04 22:11:00 +0000779/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700780 * vmbus_onmessage - Handler for channel protocol messages.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700781 *
782 * This is invoked in the vmbus worker thread context.
783 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700784void vmbus_onmessage(void *context)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700785{
Haiyang Zhang188963e2010-10-15 10:14:06 -0700786 struct hv_message *msg = context;
Greg Kroah-Hartman82250212009-08-26 15:16:04 -0700787 struct vmbus_channel_message_header *hdr;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700788 int size;
789
Haiyang Zhangf6feebe2010-11-08 14:04:39 -0800790 hdr = (struct vmbus_channel_message_header *)msg->u.payload;
791 size = msg->header.payload_size;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700792
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800793 if (hdr->msgtype >= CHANNELMSG_COUNT) {
Hank Janssen0a466182011-03-29 13:58:47 -0700794 pr_err("Received invalid channel message type %d size %d\n",
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800795 hdr->msgtype, size);
Greg Kroah-Hartman04f50c42009-07-16 12:35:37 -0700796 print_hex_dump_bytes("", DUMP_PREFIX_NONE,
Haiyang Zhangf6feebe2010-11-08 14:04:39 -0800797 (unsigned char *)msg->u.payload, size);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700798 return;
799 }
800
K. Y. Srinivasanb7c6b022011-05-10 07:55:38 -0700801 if (channel_message_table[hdr->msgtype].message_handler)
802 channel_message_table[hdr->msgtype].message_handler(hdr);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700803 else
Hank Janssen0a466182011-03-29 13:58:47 -0700804 pr_err("Unhandled channel message type %d\n", hdr->msgtype);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700805}
806
Hank Janssen3e189512010-03-04 22:11:00 +0000807/*
Haiyang Zhange98cb272010-10-15 10:14:07 -0700808 * vmbus_request_offers - Send a request to get all our pending offers.
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700809 */
Haiyang Zhange98cb272010-10-15 10:14:07 -0700810int vmbus_request_offers(void)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700811{
Greg Kroah-Hartman82250212009-08-26 15:16:04 -0700812 struct vmbus_channel_message_header *msg;
Haiyang Zhang188963e2010-10-15 10:14:06 -0700813 struct vmbus_channel_msginfo *msginfo;
Nicholas Mc Guire51e51812015-02-27 11:26:02 -0800814 int ret;
815 unsigned long t;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700816
Haiyang Zhang188963e2010-10-15 10:14:06 -0700817 msginfo = kmalloc(sizeof(*msginfo) +
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700818 sizeof(struct vmbus_channel_message_header),
819 GFP_KERNEL);
Haiyang Zhang188963e2010-10-15 10:14:06 -0700820 if (!msginfo)
Bill Pemberton75910f22010-05-05 15:27:31 -0400821 return -ENOMEM;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700822
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700823 init_completion(&msginfo->waitevent);
Bill Pemberton75910f22010-05-05 15:27:31 -0400824
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800825 msg = (struct vmbus_channel_message_header *)msginfo->msg;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700826
Haiyang Zhangc50f7fb2010-11-08 14:04:38 -0800827 msg->msgtype = CHANNELMSG_REQUESTOFFERS;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700828
Hank Janssen3e7ee492009-07-13 16:02:34 -0700829
Haiyang Zhangc6977672011-01-26 12:12:08 -0800830 ret = vmbus_post_msg(msg,
Greg Kroah-Hartmanbd60c332009-08-31 21:47:21 -0700831 sizeof(struct vmbus_channel_message_header));
832 if (ret != 0) {
Hank Janssen0a466182011-03-29 13:58:47 -0700833 pr_err("Unable to request offers - %d\n", ret);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700834
K. Y. Srinivasan0c3b7b22011-02-11 09:59:43 -0800835 goto cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700836 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700837
K. Y. Srinivasan2dfde962011-06-16 13:16:34 -0700838 t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ);
K. Y. Srinivasan9568a192011-05-10 07:55:39 -0700839 if (t == 0) {
K. Y. Srinivasan0c3b7b22011-02-11 09:59:43 -0800840 ret = -ETIMEDOUT;
841 goto cleanup;
842 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700843
844
K. Y. Srinivasan0c3b7b22011-02-11 09:59:43 -0800845
846cleanup:
Ilia Mirkindd9b15d2011-03-13 00:29:00 -0500847 kfree(msginfo);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700848
Hank Janssen3e7ee492009-07-13 16:02:34 -0700849 return ret;
850}
851
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700852/*
853 * Retrieve the (sub) channel on which to send an outgoing request.
854 * When a primary channel has multiple sub-channels, we choose a
855 * channel whose VCPU binding is closest to the VCPU on which
856 * this call is being made.
857 */
858struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary)
859{
860 struct list_head *cur, *tmp;
K. Y. Srinivasan87712bf82014-12-14 23:34:51 -0800861 int cur_cpu;
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700862 struct vmbus_channel *cur_channel;
863 struct vmbus_channel *outgoing_channel = primary;
864 int cpu_distance, new_cpu_distance;
865
866 if (list_empty(&primary->sc_list))
867 return outgoing_channel;
868
K. Y. Srinivasan87712bf82014-12-14 23:34:51 -0800869 cur_cpu = hv_context.vp_index[get_cpu()];
870 put_cpu();
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700871 list_for_each_safe(cur, tmp, &primary->sc_list) {
872 cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
873 if (cur_channel->state != CHANNEL_OPENED_STATE)
874 continue;
875
876 if (cur_channel->target_vp == cur_cpu)
877 return cur_channel;
878
879 cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ?
880 (outgoing_channel->target_vp - cur_cpu) :
881 (cur_cpu - outgoing_channel->target_vp));
882
883 new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ?
884 (cur_channel->target_vp - cur_cpu) :
885 (cur_cpu - cur_channel->target_vp));
886
887 if (cpu_distance < new_cpu_distance)
888 continue;
889
890 outgoing_channel = cur_channel;
891 }
892
893 return outgoing_channel;
894}
895EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel);
896
897static void invoke_sc_cb(struct vmbus_channel *primary_channel)
898{
899 struct list_head *cur, *tmp;
900 struct vmbus_channel *cur_channel;
901
902 if (primary_channel->sc_creation_callback == NULL)
903 return;
904
905 list_for_each_safe(cur, tmp, &primary_channel->sc_list) {
906 cur_channel = list_entry(cur, struct vmbus_channel, sc_list);
907
908 primary_channel->sc_creation_callback(cur_channel);
909 }
910}
911
912void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel,
913 void (*sc_cr_cb)(struct vmbus_channel *new_sc))
914{
915 primary_channel->sc_creation_callback = sc_cr_cb;
916}
917EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback);
918
919bool vmbus_are_subchannels_present(struct vmbus_channel *primary)
920{
921 bool ret;
922
923 ret = !list_empty(&primary->sc_list);
924
925 if (ret) {
926 /*
927 * Invoke the callback on sub-channel creation.
928 * This will present a uniform interface to the
929 * clients.
930 */
931 invoke_sc_cb(primary);
932 }
933
934 return ret;
935}
936EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present);