Commit | Line | Data |
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3e7ee490 HJ |
1 | /* |
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 | */ | |
0a46618d HJ |
23 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
24 | ||
a0086dc5 | 25 | #include <linux/kernel.h> |
0c3b7b2f S |
26 | #include <linux/sched.h> |
27 | #include <linux/wait.h> | |
5289d3d1 | 28 | #include <linux/delay.h> |
a0086dc5 | 29 | #include <linux/mm.h> |
5a0e3ad6 | 30 | #include <linux/slab.h> |
a0086dc5 | 31 | #include <linux/vmalloc.h> |
3f335ea2 S |
32 | |
33 | #include "hyperv.h" | |
0f2a6619 | 34 | #include "hyperv_vmbus.h" |
3e7ee490 | 35 | |
3e7ee490 | 36 | |
da9fcb72 HZ |
37 | struct vmbus_connection vmbus_connection = { |
38 | .conn_state = DISCONNECTED, | |
39 | .next_gpadl_handle = ATOMIC_INIT(0xE1E10), | |
3e7ee490 HJ |
40 | }; |
41 | ||
3e189519 | 42 | /* |
c6977677 | 43 | * vmbus_connect - Sends a connect request on the partition service connection |
fd8b85ea | 44 | */ |
c6977677 | 45 | int vmbus_connect(void) |
3e7ee490 | 46 | { |
fd8b85ea | 47 | int ret = 0; |
9568a193 | 48 | int t; |
15b2f647 | 49 | struct vmbus_channel_msginfo *msginfo = NULL; |
82250213 | 50 | struct vmbus_channel_initiate_contact *msg; |
dd0813b6 | 51 | unsigned long flags; |
3e7ee490 | 52 | |
454f18a9 | 53 | /* Make sure we are not connecting or connected */ |
da9fcb72 | 54 | if (vmbus_connection.conn_state != DISCONNECTED) |
3a7546d9 | 55 | return -EISCONN; |
3e7ee490 | 56 | |
454f18a9 | 57 | /* Initialize the vmbus connection */ |
da9fcb72 HZ |
58 | vmbus_connection.conn_state = CONNECTING; |
59 | vmbus_connection.work_queue = create_workqueue("hv_vmbus_con"); | |
60 | if (!vmbus_connection.work_queue) { | |
3a7546d9 | 61 | ret = -ENOMEM; |
b0043863 | 62 | goto cleanup; |
de65a384 | 63 | } |
3e7ee490 | 64 | |
da9fcb72 | 65 | INIT_LIST_HEAD(&vmbus_connection.chn_msg_list); |
15b2f647 | 66 | spin_lock_init(&vmbus_connection.channelmsg_lock); |
3e7ee490 | 67 | |
da9fcb72 | 68 | INIT_LIST_HEAD(&vmbus_connection.chn_list); |
15b2f647 | 69 | spin_lock_init(&vmbus_connection.channel_lock); |
3e7ee490 | 70 | |
454f18a9 BP |
71 | /* |
72 | * Setup the vmbus event connection for channel interrupt | |
73 | * abstraction stuff | |
74 | */ | |
df3493e0 S |
75 | vmbus_connection.int_page = |
76 | (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 0); | |
da9fcb72 | 77 | if (vmbus_connection.int_page == NULL) { |
3a7546d9 | 78 | ret = -ENOMEM; |
b0043863 | 79 | goto cleanup; |
3e7ee490 HJ |
80 | } |
81 | ||
da9fcb72 HZ |
82 | vmbus_connection.recv_int_page = vmbus_connection.int_page; |
83 | vmbus_connection.send_int_page = | |
84 | (void *)((unsigned long)vmbus_connection.int_page + | |
fd8b85ea | 85 | (PAGE_SIZE >> 1)); |
3e7ee490 | 86 | |
fd8b85ea GKH |
87 | /* |
88 | * Setup the monitor notification facility. The 1st page for | |
89 | * parent->child and the 2nd page for child->parent | |
454f18a9 | 90 | */ |
df3493e0 S |
91 | vmbus_connection.monitor_pages = |
92 | (void *)__get_free_pages((GFP_KERNEL|__GFP_ZERO), 1); | |
da9fcb72 | 93 | if (vmbus_connection.monitor_pages == NULL) { |
3a7546d9 | 94 | ret = -ENOMEM; |
b0043863 | 95 | goto cleanup; |
3e7ee490 HJ |
96 | } |
97 | ||
15b2f647 | 98 | msginfo = kzalloc(sizeof(*msginfo) + |
fd8b85ea GKH |
99 | sizeof(struct vmbus_channel_initiate_contact), |
100 | GFP_KERNEL); | |
15b2f647 | 101 | if (msginfo == NULL) { |
8cad0af9 | 102 | ret = -ENOMEM; |
b0043863 | 103 | goto cleanup; |
3e7ee490 HJ |
104 | } |
105 | ||
9568a193 | 106 | init_completion(&msginfo->waitevent); |
80d11b2a | 107 | |
15b2f647 | 108 | msg = (struct vmbus_channel_initiate_contact *)msginfo->msg; |
3e7ee490 | 109 | |
c50f7fb2 HZ |
110 | msg->header.msgtype = CHANNELMSG_INITIATE_CONTACT; |
111 | msg->vmbus_version_requested = VMBUS_REVISION_NUMBER; | |
da9fcb72 HZ |
112 | msg->interrupt_page = virt_to_phys(vmbus_connection.int_page); |
113 | msg->monitor_page1 = virt_to_phys(vmbus_connection.monitor_pages); | |
c50f7fb2 | 114 | msg->monitor_page2 = virt_to_phys( |
da9fcb72 | 115 | (void *)((unsigned long)vmbus_connection.monitor_pages + |
fd8b85ea | 116 | PAGE_SIZE)); |
3e7ee490 | 117 | |
454f18a9 BP |
118 | /* |
119 | * Add to list before we send the request since we may | |
120 | * receive the response before returning from this routine | |
121 | */ | |
15b2f647 HZ |
122 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
123 | list_add_tail(&msginfo->msglistentry, | |
da9fcb72 | 124 | &vmbus_connection.chn_msg_list); |
53af545b | 125 | |
15b2f647 | 126 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 127 | |
c6977677 | 128 | ret = vmbus_post_msg(msg, |
fd8b85ea GKH |
129 | sizeof(struct vmbus_channel_initiate_contact)); |
130 | if (ret != 0) { | |
0c3b7b2f | 131 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
15b2f647 | 132 | list_del(&msginfo->msglistentry); |
0c3b7b2f S |
133 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, |
134 | flags); | |
b0043863 | 135 | goto cleanup; |
3e7ee490 HJ |
136 | } |
137 | ||
454f18a9 | 138 | /* Wait for the connection response */ |
2dfde964 | 139 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 140 | if (t == 0) { |
0c3b7b2f S |
141 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, |
142 | flags); | |
143 | list_del(&msginfo->msglistentry); | |
144 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, | |
145 | flags); | |
146 | ret = -ETIMEDOUT; | |
b0043863 | 147 | goto cleanup; |
0c3b7b2f | 148 | } |
3e7ee490 | 149 | |
0c3b7b2f | 150 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
15b2f647 | 151 | list_del(&msginfo->msglistentry); |
0c3b7b2f | 152 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 153 | |
454f18a9 | 154 | /* Check if successful */ |
15b2f647 | 155 | if (msginfo->response.version_response.version_supported) { |
da9fcb72 | 156 | vmbus_connection.conn_state = CONNECTED; |
fd8b85ea | 157 | } else { |
0a46618d HJ |
158 | pr_err("Unable to connect, " |
159 | "Version %d not supported by Hyper-V\n", | |
160 | VMBUS_REVISION_NUMBER); | |
3a7546d9 | 161 | ret = -ECONNREFUSED; |
b0043863 | 162 | goto cleanup; |
3e7ee490 HJ |
163 | } |
164 | ||
15b2f647 | 165 | kfree(msginfo); |
3e7ee490 HJ |
166 | return 0; |
167 | ||
b0043863 | 168 | cleanup: |
da9fcb72 | 169 | vmbus_connection.conn_state = DISCONNECTED; |
3e7ee490 | 170 | |
da9fcb72 HZ |
171 | if (vmbus_connection.work_queue) |
172 | destroy_workqueue(vmbus_connection.work_queue); | |
3e7ee490 | 173 | |
da9fcb72 | 174 | if (vmbus_connection.int_page) { |
df3493e0 | 175 | free_pages((unsigned long)vmbus_connection.int_page, 0); |
da9fcb72 | 176 | vmbus_connection.int_page = NULL; |
3e7ee490 HJ |
177 | } |
178 | ||
da9fcb72 | 179 | if (vmbus_connection.monitor_pages) { |
df3493e0 | 180 | free_pages((unsigned long)vmbus_connection.monitor_pages, 1); |
da9fcb72 | 181 | vmbus_connection.monitor_pages = NULL; |
3e7ee490 HJ |
182 | } |
183 | ||
dd9b15dc | 184 | kfree(msginfo); |
3e7ee490 | 185 | |
3e7ee490 HJ |
186 | return ret; |
187 | } | |
188 | ||
3e7ee490 | 189 | |
3e189519 | 190 | /* |
c6977677 HZ |
191 | * relid2channel - Get the channel object given its |
192 | * child relative id (ie channel id) | |
fd8b85ea | 193 | */ |
c6977677 | 194 | struct vmbus_channel *relid2channel(u32 relid) |
3e7ee490 | 195 | { |
aded7165 | 196 | struct vmbus_channel *channel; |
15b2f647 | 197 | struct vmbus_channel *found_channel = NULL; |
0f5e44ca | 198 | unsigned long flags; |
3e7ee490 | 199 | |
15b2f647 | 200 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
da9fcb72 | 201 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
15b2f647 HZ |
202 | if (channel->offermsg.child_relid == relid) { |
203 | found_channel = channel; | |
3e7ee490 HJ |
204 | break; |
205 | } | |
206 | } | |
15b2f647 | 207 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 208 | |
15b2f647 | 209 | return found_channel; |
3e7ee490 HJ |
210 | } |
211 | ||
3e189519 | 212 | /* |
c6977677 | 213 | * process_chn_event - Process a channel event notification |
fd8b85ea | 214 | */ |
35436487 | 215 | static void process_chn_event(u32 relid) |
3e7ee490 | 216 | { |
aded7165 | 217 | struct vmbus_channel *channel; |
dad76bf7 | 218 | unsigned long flags; |
3e7ee490 | 219 | |
454f18a9 BP |
220 | /* |
221 | * Find the channel based on this relid and invokes the | |
222 | * channel callback to process the event | |
223 | */ | |
c6977677 | 224 | channel = relid2channel(relid); |
3e7ee490 | 225 | |
dad76bf7 | 226 | spin_lock_irqsave(&channel->inbound_lock, flags); |
76c39d42 | 227 | if (channel && (channel->onchannel_callback != NULL)) { |
df452fa1 | 228 | channel->onchannel_callback(channel->channel_callback_context); |
fd8b85ea | 229 | } else { |
35436487 | 230 | pr_err("channel not found for relid - %u\n", relid); |
3e7ee490 | 231 | } |
dad76bf7 | 232 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
233 | } |
234 | ||
3e189519 | 235 | /* |
c6977677 | 236 | * vmbus_on_event - Handler for events |
fd8b85ea | 237 | */ |
6de3d6aa | 238 | void vmbus_on_event(unsigned long data) |
3e7ee490 | 239 | { |
35436487 OH |
240 | u32 dword; |
241 | u32 maxdword = MAX_NUM_CHANNELS_SUPPORTED >> 5; | |
3e7ee490 | 242 | int bit; |
35436487 | 243 | u32 relid; |
da9fcb72 | 244 | u32 *recv_int_page = vmbus_connection.recv_int_page; |
3e7ee490 | 245 | |
454f18a9 | 246 | /* Check events */ |
242b45aa OH |
247 | if (!recv_int_page) |
248 | return; | |
249 | for (dword = 0; dword < maxdword; dword++) { | |
250 | if (!recv_int_page[dword]) | |
251 | continue; | |
252 | for (bit = 0; bit < 32; bit++) { | |
253 | if (sync_test_and_clear_bit(bit, (unsigned long *)&recv_int_page[dword])) { | |
254 | relid = (dword << 5) + bit; | |
255 | ||
256 | if (relid == 0) { | |
6d81d330 S |
257 | /* |
258 | * Special case - vmbus | |
259 | * channel protocol msg | |
260 | */ | |
242b45aa | 261 | continue; |
3e7ee490 | 262 | } |
35436487 | 263 | process_chn_event(relid); |
3e7ee490 | 264 | } |
242b45aa | 265 | } |
3e7ee490 | 266 | } |
3e7ee490 HJ |
267 | } |
268 | ||
3e189519 | 269 | /* |
c6977677 | 270 | * vmbus_post_msg - Send a msg on the vmbus's message connection |
fd8b85ea | 271 | */ |
c6977677 | 272 | int vmbus_post_msg(void *buffer, size_t buflen) |
3e7ee490 | 273 | { |
15b2f647 | 274 | union hv_connection_id conn_id; |
5289d3d1 S |
275 | int ret = 0; |
276 | int retries = 0; | |
3e7ee490 | 277 | |
15b2f647 HZ |
278 | conn_id.asu32 = 0; |
279 | conn_id.u.id = VMBUS_MESSAGE_CONNECTION_ID; | |
5289d3d1 S |
280 | |
281 | /* | |
282 | * hv_post_message() can have transient failures because of | |
283 | * insufficient resources. Retry the operation a couple of | |
284 | * times before giving up. | |
285 | */ | |
286 | while (retries < 3) { | |
287 | ret = hv_post_message(conn_id, 1, buffer, buflen); | |
288 | if (ret != HV_STATUS_INSUFFICIENT_BUFFERS) | |
289 | return ret; | |
290 | retries++; | |
291 | msleep(100); | |
292 | } | |
293 | return ret; | |
3e7ee490 HJ |
294 | } |
295 | ||
3e189519 | 296 | /* |
c6977677 | 297 | * vmbus_set_event - Send an event notification to the parent |
fd8b85ea | 298 | */ |
c6977677 | 299 | int vmbus_set_event(u32 child_relid) |
3e7ee490 | 300 | { |
454f18a9 | 301 | /* Each u32 represents 32 channels */ |
22356585 | 302 | sync_set_bit(child_relid & 31, |
da9fcb72 | 303 | (unsigned long *)vmbus_connection.send_int_page + |
15b2f647 | 304 | (child_relid >> 5)); |
7c369f40 | 305 | |
d44890c8 | 306 | return hv_signal_event(); |
3e7ee490 | 307 | } |