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Hank Janssen3e7ee492009-07-13 16:02:34 -07001/*
2 *
3 * Copyright (c) 2009, Microsoft Corporation.
4 *
5 * This program is free software; you can redistribute it and/or modify it
6 * under the terms and conditions of the GNU General Public License,
7 * version 2, as published by the Free Software Foundation.
8 *
9 * This program is distributed in the hope it will be useful, but WITHOUT
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
12 * more details.
13 *
14 * You should have received a copy of the GNU General Public License along with
15 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
16 * Place - Suite 330, Boston, MA 02111-1307 USA.
17 *
18 * Authors:
19 * Haiyang Zhang <haiyangz@microsoft.com>
20 * Hank Janssen <hjanssen@microsoft.com>
21 *
22 */
Hank Janssen0a466182011-03-29 13:58:47 -070023#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24
Greg Kroah-Hartmana0086dc2009-08-17 17:22:08 -070025#include <linux/kernel.h>
K. Y. Srinivasan0c3b7b22011-02-11 09:59:43 -080026#include <linux/sched.h>
27#include <linux/wait.h>
K. Y. Srinivasan5289d3d2011-08-25 09:49:01 -070028#include <linux/delay.h>
Greg Kroah-Hartmana0086dc2009-08-17 17:22:08 -070029#include <linux/mm.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090030#include <linux/slab.h>
Greg Kroah-Hartmana0086dc2009-08-17 17:22:08 -070031#include <linux/vmalloc.h>
Greg Kroah-Hartman46a97192011-10-04 12:29:52 -070032#include <linux/hyperv.h>
K. Y. Srinivasan37f72782012-12-01 06:46:41 -080033#include <linux/export.h>
Greg Kroah-Hartman407dd162011-10-11 08:36:44 -060034#include <asm/hyperv.h>
K. Y. Srinivasan0f2a6612011-05-12 19:34:28 -070035#include "hyperv_vmbus.h"
Hank Janssen3e7ee492009-07-13 16:02:34 -070036
Hank Janssen3e7ee492009-07-13 16:02:34 -070037
Haiyang Zhangda9fcb72011-01-26 12:12:14 -080038struct vmbus_connection vmbus_connection = {
39 .conn_state = DISCONNECTED,
40 .next_gpadl_handle = ATOMIC_INIT(0xE1E10),
Hank Janssen3e7ee492009-07-13 16:02:34 -070041};
42
Hank Janssen3e189512010-03-04 22:11:00 +000043/*
K. Y. Srinivasan37f72782012-12-01 06:46:41 -080044 * Negotiated protocol version with the host.
45 */
46__u32 vmbus_proto_version;
47EXPORT_SYMBOL_GPL(vmbus_proto_version);
48
K. Y. Srinivasan610071c2012-12-01 06:46:38 -080049static __u32 vmbus_get_next_version(__u32 current_version)
50{
51 switch (current_version) {
52 case (VERSION_WIN7):
53 return VERSION_WS2008;
54
55 case (VERSION_WIN8):
56 return VERSION_WIN7;
57
K. Y. Srinivasan03367ef2014-04-03 18:02:45 -070058 case (VERSION_WIN8_1):
59 return VERSION_WIN8;
60
K. Y. Srinivasan610071c2012-12-01 06:46:38 -080061 case (VERSION_WS2008):
62 default:
63 return VERSION_INVAL;
64 }
65}
66
67static int vmbus_negotiate_version(struct vmbus_channel_msginfo *msginfo,
68 __u32 version)
69{
70 int ret = 0;
71 struct vmbus_channel_initiate_contact *msg;
72 unsigned long flags;
K. Y. Srinivasan610071c2012-12-01 06:46:38 -080073
74 init_completion(&msginfo->waitevent);
75
76 msg = (struct vmbus_channel_initiate_contact *)msginfo->msg;
77
78 msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT;
79 msg->vmbus_version_requested = version;
80 msg->interrupt_page = virt_to_phys(vmbus_connection.int_page);
Greg Kroah-Hartman8681db42013-09-13 11:32:55 -070081 msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages[0]);
82 msg->monitor_page2 = virt_to_phys(vmbus_connection.monitor_pages[1]);
K. Y. Srinivasan03367ef2014-04-03 18:02:45 -070083 if (version == VERSION_WIN8_1)
K. Y. Srinivasane28bab42014-01-15 17:12:58 -080084 msg->target_vcpu = hv_context.vp_index[smp_processor_id()];
K. Y. Srinivasan610071c2012-12-01 06:46:38 -080085
86 /*
87 * Add to list before we send the request since we may
88 * receive the response before returning from this routine
89 */
90 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
91 list_add_tail(&msginfo->msglistentry,
92 &vmbus_connection.chn_msg_list);
93
94 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
95
96 ret = vmbus_post_msg(msg,
97 sizeof(struct vmbus_channel_initiate_contact));
98 if (ret != 0) {
99 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
100 list_del(&msginfo->msglistentry);
101 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock,
102 flags);
103 return ret;
104 }
105
106 /* Wait for the connection response */
K. Y. Srinivasan269f9792014-01-16 11:59:58 -0800107 wait_for_completion(&msginfo->waitevent);
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800108
109 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags);
110 list_del(&msginfo->msglistentry);
111 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags);
112
113 /* Check if successful */
114 if (msginfo->response.version_response.version_supported) {
115 vmbus_connection.conn_state = CONNECTED;
116 } else {
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800117 return -ECONNREFUSED;
118 }
119
120 return ret;
121}
122
123/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800124 * vmbus_connect - Sends a connect request on the partition service connection
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700125 */
Haiyang Zhangc6977672011-01-26 12:12:08 -0800126int vmbus_connect(void)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700127{
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700128 int ret = 0;
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800129 struct vmbus_channel_msginfo *msginfo = NULL;
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800130 __u32 version;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700131
Bill Pemberton454f18a2009-07-27 16:47:24 -0400132 /* Initialize the vmbus connection */
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800133 vmbus_connection.conn_state = CONNECTING;
134 vmbus_connection.work_queue = create_workqueue("hv_vmbus_con");
135 if (!vmbus_connection.work_queue) {
K. Y. Srinivasan3a7546d2011-06-06 15:50:10 -0700136 ret = -ENOMEM;
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700137 goto cleanup;
Bill Pembertonde65a382009-07-29 17:00:09 -0400138 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700139
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800140 INIT_LIST_HEAD(&vmbus_connection.chn_msg_list);
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800141 spin_lock_init(&vmbus_connection.channelmsg_lock);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700142
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800143 INIT_LIST_HEAD(&vmbus_connection.chn_list);
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800144 spin_lock_init(&vmbus_connection.channel_lock);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700145
Bill Pemberton454f18a2009-07-27 16:47:24 -0400146 /*
147 * Setup the vmbus event connection for channel interrupt
148 * abstraction stuff
149 */
K. Y. Srinivasandf3493e2011-02-11 09:59:00 -0800150 vmbus_connection.int_page =
151 (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0);
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800152 if (vmbus_connection.int_page == NULL) {
K. Y. Srinivasan3a7546d2011-06-06 15:50:10 -0700153 ret = -ENOMEM;
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700154 goto cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700155 }
156
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800157 vmbus_connection.recv_int_page = vmbus_connection.int_page;
158 vmbus_connection.send_int_page =
159 (void *)((unsigned long)vmbus_connection.int_page +
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700160 (PAGE_SIZE >> 1));
Hank Janssen3e7ee492009-07-13 16:02:34 -0700161
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700162 /*
163 * Setup the monitor notification facility. The 1st page for
164 * parent->child and the 2nd page for child->parent
Bill Pemberton454f18a2009-07-27 16:47:24 -0400165 */
Greg Kroah-Hartman8681db42013-09-13 11:32:55 -0700166 vmbus_connection.monitor_pages[0] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
167 vmbus_connection.monitor_pages[1] = (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 0);
168 if ((vmbus_connection.monitor_pages[0] == NULL) ||
169 (vmbus_connection.monitor_pages[1] == NULL)) {
K. Y. Srinivasan3a7546d2011-06-06 15:50:10 -0700170 ret = -ENOMEM;
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700171 goto cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700172 }
173
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800174 msginfo = kzalloc(sizeof(*msginfo) +
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700175 sizeof(struct vmbus_channel_initiate_contact),
176 GFP_KERNEL);
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800177 if (msginfo == NULL) {
Bill Pemberton8cad0af2010-05-05 15:27:32 -0400178 ret = -ENOMEM;
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700179 goto cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700180 }
181
Bill Pemberton454f18a2009-07-27 16:47:24 -0400182 /*
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800183 * Negotiate a compatible VMBUS version number with the
184 * host. We start with the highest number we can support
185 * and work our way down until we negotiate a compatible
186 * version.
Bill Pemberton454f18a2009-07-27 16:47:24 -0400187 */
Bill Pemberton53af5452009-09-11 21:46:44 -0400188
K. Y. Srinivasan2a5c43a2012-12-01 06:46:56 -0800189 version = VERSION_CURRENT;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700190
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800191 do {
192 ret = vmbus_negotiate_version(msginfo, version);
K. Y. Srinivasan8bbf9f42013-09-04 15:41:58 -0700193 if (ret == -ETIMEDOUT)
K. Y. Srinivasan666b9ad2013-08-28 14:56:54 -0700194 goto cleanup;
195
196 if (vmbus_connection.conn_state == CONNECTED)
K. Y. Srinivasan610071c2012-12-01 06:46:38 -0800197 break;
198
199 version = vmbus_get_next_version(version);
200 } while (version != VERSION_INVAL);
201
202 if (version == VERSION_INVAL)
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700203 goto cleanup;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700204
K. Y. Srinivasan37f72782012-12-01 06:46:41 -0800205 vmbus_proto_version = version;
K. Y. Srinivasan3bacaf0c2012-12-01 06:46:59 -0800206 pr_info("Hyper-V Host Build:%d-%d.%d-%d-%d.%d; Vmbus version:%d.%d\n",
207 host_info_eax, host_info_ebx >> 16,
208 host_info_ebx & 0xFFFF, host_info_ecx,
209 host_info_edx >> 24, host_info_edx & 0xFFFFFF,
210 version >> 16, version & 0xFFFF);
211
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800212 kfree(msginfo);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700213 return 0;
214
K. Y. Srinivasanb0043862011-05-10 07:55:44 -0700215cleanup:
K. Y. Srinivasan3bacaf0c2012-12-01 06:46:59 -0800216 pr_err("Unable to connect to host\n");
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800217 vmbus_connection.conn_state = DISCONNECTED;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700218
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800219 if (vmbus_connection.work_queue)
220 destroy_workqueue(vmbus_connection.work_queue);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700221
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800222 if (vmbus_connection.int_page) {
K. Y. Srinivasandf3493e2011-02-11 09:59:00 -0800223 free_pages((unsigned long)vmbus_connection.int_page, 0);
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800224 vmbus_connection.int_page = NULL;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700225 }
226
Radim Krčmářa100d88d2014-05-27 19:16:20 +0200227 free_pages((unsigned long)vmbus_connection.monitor_pages[0], 0);
228 free_pages((unsigned long)vmbus_connection.monitor_pages[1], 0);
Greg Kroah-Hartman8681db42013-09-13 11:32:55 -0700229 vmbus_connection.monitor_pages[0] = NULL;
230 vmbus_connection.monitor_pages[1] = NULL;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700231
Ilia Mirkindd9b15d2011-03-13 00:29:00 -0500232 kfree(msginfo);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700233
Hank Janssen3e7ee492009-07-13 16:02:34 -0700234 return ret;
235}
236
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700237/*
238 * Map the given relid to the corresponding channel based on the
239 * per-cpu list of channels that have been affinitized to this CPU.
240 * This will be used in the channel callback path as we can do this
241 * mapping in a lock-free fashion.
242 */
243static struct vmbus_channel *pcpu_relid2channel(u32 relid)
244{
245 struct vmbus_channel *channel;
246 struct vmbus_channel *found_channel = NULL;
247 int cpu = smp_processor_id();
248 struct list_head *pcpu_head = &hv_context.percpu_list[cpu];
249
250 list_for_each_entry(channel, pcpu_head, percpu_list) {
251 if (channel->offermsg.child_relid == relid) {
252 found_channel = channel;
253 break;
254 }
255 }
256
257 return found_channel;
258}
Hank Janssen3e7ee492009-07-13 16:02:34 -0700259
Hank Janssen3e189512010-03-04 22:11:00 +0000260/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800261 * relid2channel - Get the channel object given its
262 * child relative id (ie channel id)
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700263 */
Haiyang Zhangc6977672011-01-26 12:12:08 -0800264struct vmbus_channel *relid2channel(u32 relid)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700265{
Greg Kroah-Hartmanaded71652009-08-18 15:21:19 -0700266 struct vmbus_channel *channel;
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800267 struct vmbus_channel *found_channel = NULL;
Greg Kroah-Hartman0f5e44c2009-07-15 14:57:16 -0700268 unsigned long flags;
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700269 struct list_head *cur, *tmp;
270 struct vmbus_channel *cur_sc;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700271
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800272 spin_lock_irqsave(&vmbus_connection.channel_lock, flags);
Haiyang Zhangda9fcb72011-01-26 12:12:14 -0800273 list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800274 if (channel->offermsg.child_relid == relid) {
275 found_channel = channel;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700276 break;
K. Y. Srinivasane68d2972013-05-23 12:02:32 -0700277 } else if (!list_empty(&channel->sc_list)) {
278 /*
279 * Deal with sub-channels.
280 */
281 list_for_each_safe(cur, tmp, &channel->sc_list) {
282 cur_sc = list_entry(cur, struct vmbus_channel,
283 sc_list);
284 if (cur_sc->offermsg.child_relid == relid) {
285 found_channel = cur_sc;
286 break;
287 }
288 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700289 }
290 }
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800291 spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700292
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800293 return found_channel;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700294}
295
Hank Janssen3e189512010-03-04 22:11:00 +0000296/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800297 * process_chn_event - Process a channel event notification
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700298 */
Olaf Hering35436482011-04-16 18:50:40 +0200299static void process_chn_event(u32 relid)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700300{
Greg Kroah-Hartmanaded71652009-08-18 15:21:19 -0700301 struct vmbus_channel *channel;
K. Y. Srinivasanf878f3d2012-12-01 06:46:35 -0800302 void *arg;
303 bool read_state;
304 u32 bytes_to_read;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700305
Bill Pemberton454f18a2009-07-27 16:47:24 -0400306 /*
307 * Find the channel based on this relid and invokes the
308 * channel callback to process the event
309 */
K. Y. Srinivasan3a28fa32014-04-08 18:45:54 -0700310 channel = pcpu_relid2channel(relid);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700311
K. Y. Srinivasan24326032011-08-31 14:35:57 -0700312 if (!channel) {
313 pr_err("channel not found for relid - %u\n", relid);
314 return;
315 }
316
317 /*
318 * A channel once created is persistent even when there
319 * is no driver handling the device. An unloading driver
K. Y. Srinivasand3ba7202014-04-08 18:45:53 -0700320 * sets the onchannel_callback to NULL on the same CPU
321 * as where this interrupt is handled (in an interrupt context).
322 * Thus, checking and invoking the driver specific callback takes
323 * care of orderly unloading of the driver.
K. Y. Srinivasan24326032011-08-31 14:35:57 -0700324 */
325
K. Y. Srinivasanf878f3d2012-12-01 06:46:35 -0800326 if (channel->onchannel_callback != NULL) {
327 arg = channel->channel_callback_context;
328 read_state = channel->batched_reading;
329 /*
330 * This callback reads the messages sent by the host.
331 * We can optimize host to guest signaling by ensuring:
332 * 1. While reading the channel, we disable interrupts from
333 * host.
334 * 2. Ensure that we process all posted messages from the host
335 * before returning from this callback.
336 * 3. Once we return, enable signaling from the host. Once this
337 * state is set we check to see if additional packets are
338 * available to read. In this case we repeat the process.
339 */
340
341 do {
K. Y. Srinivasanaffb1af2014-07-07 16:34:24 -0700342 if (read_state)
343 hv_begin_read(&channel->inbound);
K. Y. Srinivasanf878f3d2012-12-01 06:46:35 -0800344 channel->onchannel_callback(arg);
K. Y. Srinivasanaffb1af2014-07-07 16:34:24 -0700345 if (read_state)
346 bytes_to_read = hv_end_read(&channel->inbound);
347 else
348 bytes_to_read = 0;
K. Y. Srinivasanf878f3d2012-12-01 06:46:35 -0800349 } while (read_state && (bytes_to_read != 0));
350 } else {
K. Y. Srinivasan24326032011-08-31 14:35:57 -0700351 pr_err("no channel callback for relid - %u\n", relid);
K. Y. Srinivasanf878f3d2012-12-01 06:46:35 -0800352 }
K. Y. Srinivasand9add43b2011-08-27 11:31:43 -0700353
Hank Janssen3e7ee492009-07-13 16:02:34 -0700354}
355
Hank Janssen3e189512010-03-04 22:11:00 +0000356/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800357 * vmbus_on_event - Handler for events
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700358 */
K. Y. Srinivasan6de3d6a2011-03-10 14:05:16 -0800359void vmbus_on_event(unsigned long data)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700360{
Olaf Hering35436482011-04-16 18:50:40 +0200361 u32 dword;
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800362 u32 maxdword;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700363 int bit;
Olaf Hering35436482011-04-16 18:50:40 +0200364 u32 relid;
K. Y. Srinivasan6552ecd2012-12-01 06:46:49 -0800365 u32 *recv_int_page = NULL;
366 void *page_addr;
367 int cpu = smp_processor_id();
368 union hv_synic_event_flags *event;
369
370 if ((vmbus_proto_version == VERSION_WS2008) ||
371 (vmbus_proto_version == VERSION_WIN7)) {
372 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5;
373 recv_int_page = vmbus_connection.recv_int_page;
374 } else {
375 /*
376 * When the host is win8 and beyond, the event page
377 * can be directly checked to get the id of the channel
378 * that has the interrupt pending.
379 */
380 maxdword = HV_EVENT_FLAGS_DWORD_COUNT;
381 page_addr = hv_context.synic_event_page[cpu];
382 event = (union hv_synic_event_flags *)page_addr +
383 VMBUS_MESSAGE_SINT;
384 recv_int_page = event->flags32;
385 }
386
387
Hank Janssen3e7ee492009-07-13 16:02:34 -0700388
Bill Pemberton454f18a2009-07-27 16:47:24 -0400389 /* Check events */
Olaf Hering242b45a2011-04-16 18:50:39 +0200390 if (!recv_int_page)
391 return;
392 for (dword = 0; dword < maxdword; dword++) {
393 if (!recv_int_page[dword])
394 continue;
395 for (bit = 0; bit < 32; bit++) {
K. Y. Srinivasand9add43b2011-08-27 11:31:43 -0700396 if (sync_test_and_clear_bit(bit,
397 (unsigned long *)&recv_int_page[dword])) {
Olaf Hering242b45a2011-04-16 18:50:39 +0200398 relid = (dword << 5) + bit;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700399
K. Y. Srinivasand9add43b2011-08-27 11:31:43 -0700400 if (relid == 0)
K. Y. Srinivasan6d81d332011-05-10 07:55:45 -0700401 /*
402 * Special case - vmbus
403 * channel protocol msg
404 */
Olaf Hering242b45a2011-04-16 18:50:39 +0200405 continue;
K. Y. Srinivasand9add43b2011-08-27 11:31:43 -0700406
Olaf Hering35436482011-04-16 18:50:40 +0200407 process_chn_event(relid);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700408 }
Olaf Hering242b45a2011-04-16 18:50:39 +0200409 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700410 }
Hank Janssen3e7ee492009-07-13 16:02:34 -0700411}
412
Hank Janssen3e189512010-03-04 22:11:00 +0000413/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800414 * vmbus_post_msg - Send a msg on the vmbus's message connection
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700415 */
Haiyang Zhangc6977672011-01-26 12:12:08 -0800416int vmbus_post_msg(void *buffer, size_t buflen)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700417{
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800418 union hv_connection_id conn_id;
K. Y. Srinivasan5289d3d2011-08-25 09:49:01 -0700419 int ret = 0;
420 int retries = 0;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700421
Haiyang Zhang15b2f642011-01-26 12:12:07 -0800422 conn_id.asu32 = 0;
423 conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID;
K. Y. Srinivasan5289d3d2011-08-25 09:49:01 -0700424
425 /*
426 * hv_post_message() can have transient failures because of
427 * insufficient resources. Retry the operation a couple of
428 * times before giving up.
429 */
430 while (retries < 3) {
431 ret = hv_post_message(conn_id, 1, buffer, buflen);
432 if (ret != HV_STATUS_INSUFFICIENT_BUFFERS)
433 return ret;
434 retries++;
435 msleep(100);
436 }
437 return ret;
Hank Janssen3e7ee492009-07-13 16:02:34 -0700438}
439
Hank Janssen3e189512010-03-04 22:11:00 +0000440/*
Haiyang Zhangc6977672011-01-26 12:12:08 -0800441 * vmbus_set_event - Send an event notification to the parent
Greg Kroah-Hartmanfd8b85e2009-08-31 11:40:14 -0700442 */
K. Y. Srinivasan21c3bef2012-12-01 06:46:43 -0800443int vmbus_set_event(struct vmbus_channel *channel)
Hank Janssen3e7ee492009-07-13 16:02:34 -0700444{
K. Y. Srinivasan21c3bef2012-12-01 06:46:43 -0800445 u32 child_relid = channel->offermsg.child_relid;
Bill Pemberton7c369f42009-07-29 17:00:11 -0400446
K. Y. Srinivasan3be77772012-12-01 06:46:46 -0800447 if (!channel->is_dedicated_interrupt) {
448 /* Each u32 represents 32 channels */
449 sync_set_bit(child_relid & 31,
450 (unsigned long *)vmbus_connection.send_int_page +
451 (child_relid >> 5));
452 }
453
454 return hv_signal_event(channel->sig_event);
Hank Janssen3e7ee492009-07-13 16:02:34 -0700455}