Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * 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> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
a0086dc5 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
53af545b | 28 | #include <linux/list.h> |
c88c4e4c | 29 | #include <linux/module.h> |
8b5d6d3b | 30 | #include <linux/completion.h> |
46a97191 | 31 | #include <linux/hyperv.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
1d7e907f | 35 | struct vmbus_channel_message_table_entry { |
cf9dcba7 | 36 | enum vmbus_channel_message_type message_type; |
fa90f1de | 37 | void (*message_handler)(struct vmbus_channel_message_header *msg); |
1d7e907f | 38 | }; |
3e7ee490 | 39 | |
c88c4e4c HJ |
40 | |
41 | /** | |
da0e9631 | 42 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
43 | * @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. | |
c836d0ab S |
49 | * Set up and fill in default negotiate response message. |
50 | * | |
51 | * The max_fw_version specifies the maximum framework version that | |
52 | * we can support and max _srv_version specifies the maximum service | |
53 | * version we can support. A special value MAX_SRV_VER can be | |
54 | * specified to indicate that we can handle the maximum version | |
55 | * exposed by the host. | |
c88c4e4c HJ |
56 | * |
57 | * Mainly used by Hyper-V drivers. | |
58 | */ | |
da0e9631 | 59 | void vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab S |
60 | struct icmsg_negotiate *negop, u8 *buf, |
61 | int max_fw_version, int max_srv_version) | |
c88c4e4c | 62 | { |
c836d0ab S |
63 | int icframe_vercnt; |
64 | int icmsg_vercnt; | |
65 | int i; | |
66 | ||
a3605300 | 67 | icmsghdrp->icmsgsize = 0x10; |
c88c4e4c | 68 | |
a3605300 S |
69 | negop = (struct icmsg_negotiate *)&buf[ |
70 | sizeof(struct vmbuspipe_hdr) + | |
71 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 72 | |
c836d0ab S |
73 | icframe_vercnt = negop->icframe_vercnt; |
74 | icmsg_vercnt = negop->icmsg_vercnt; | |
75 | ||
76 | /* | |
77 | * Select the framework version number we will | |
78 | * support. | |
79 | */ | |
80 | ||
81 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
82 | if (negop->icversion_data[i].major <= max_fw_version) | |
83 | icframe_vercnt = negop->icversion_data[i].major; | |
84 | } | |
85 | ||
86 | for (i = negop->icframe_vercnt; | |
87 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
88 | if (negop->icversion_data[i].major <= max_srv_version) | |
89 | icmsg_vercnt = negop->icversion_data[i].major; | |
c88c4e4c | 90 | } |
a3605300 | 91 | |
c836d0ab S |
92 | /* |
93 | * Respond with the maximum framework and service | |
94 | * version numbers we can support. | |
95 | */ | |
a3605300 S |
96 | negop->icframe_vercnt = 1; |
97 | negop->icmsg_vercnt = 1; | |
c836d0ab S |
98 | negop->icversion_data[0].major = icframe_vercnt; |
99 | negop->icversion_data[0].minor = 0; | |
100 | negop->icversion_data[1].major = icmsg_vercnt; | |
101 | negop->icversion_data[1].minor = 0; | |
c88c4e4c | 102 | } |
a3605300 | 103 | |
da0e9631 | 104 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 105 | |
3e189519 | 106 | /* |
e98cb276 | 107 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 108 | */ |
50fe56d2 | 109 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 110 | { |
aded7165 | 111 | struct vmbus_channel *channel; |
3e7ee490 | 112 | |
aded7165 | 113 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 114 | if (!channel) |
3e7ee490 | 115 | return NULL; |
3e7ee490 | 116 | |
54411c42 | 117 | spin_lock_init(&channel->inbound_lock); |
3e7ee490 | 118 | |
c50f7fb2 HZ |
119 | channel->controlwq = create_workqueue("hv_vmbus_ctl"); |
120 | if (!channel->controlwq) { | |
8c69f52a | 121 | kfree(channel); |
3e7ee490 HJ |
122 | return NULL; |
123 | } | |
124 | ||
125 | return channel; | |
126 | } | |
127 | ||
3e189519 | 128 | /* |
e98cb276 | 129 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 130 | */ |
4b2f9abe | 131 | static void release_channel(struct work_struct *work) |
3e7ee490 | 132 | { |
4b2f9abe TT |
133 | struct vmbus_channel *channel = container_of(work, |
134 | struct vmbus_channel, | |
135 | work); | |
3e7ee490 | 136 | |
c50f7fb2 | 137 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 138 | |
8c69f52a | 139 | kfree(channel); |
3e7ee490 HJ |
140 | } |
141 | ||
3e189519 | 142 | /* |
e98cb276 | 143 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 144 | */ |
9f3e28e3 | 145 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 146 | { |
3e7ee490 | 147 | |
bd60c33e GKH |
148 | /* |
149 | * We have to release the channel's workqueue/thread in the vmbus's | |
150 | * workqueue/thread context | |
151 | * ie we can't destroy ourselves. | |
152 | */ | |
4b2f9abe | 153 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 154 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
155 | } |
156 | ||
8b5d6d3b | 157 | |
8b5d6d3b | 158 | |
4b2f9abe TT |
159 | /* |
160 | * vmbus_process_rescind_offer - | |
161 | * Rescind the offer by initiating a device removal | |
162 | */ | |
163 | static void vmbus_process_rescind_offer(struct work_struct *work) | |
164 | { | |
165 | struct vmbus_channel *channel = container_of(work, | |
166 | struct vmbus_channel, | |
167 | work); | |
c8705979 S |
168 | unsigned long flags; |
169 | struct vmbus_channel_relid_released msg; | |
4b2f9abe | 170 | |
696453ba | 171 | vmbus_device_unregister(channel->device_obj); |
c8705979 S |
172 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
173 | msg.child_relid = channel->offermsg.child_relid; | |
174 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; | |
175 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
176 | ||
177 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
178 | list_del(&channel->listentry); | |
179 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
180 | free_channel(channel); | |
4b2f9abe | 181 | } |
8b5d6d3b | 182 | |
93e5bd06 S |
183 | void vmbus_free_channels(void) |
184 | { | |
185 | struct vmbus_channel *channel; | |
186 | ||
187 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
188 | vmbus_device_unregister(channel->device_obj); | |
189 | kfree(channel->device_obj); | |
190 | free_channel(channel); | |
191 | } | |
192 | } | |
193 | ||
3e189519 | 194 | /* |
e98cb276 | 195 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 196 | * associated with this offer |
bd60c33e | 197 | */ |
4b2f9abe | 198 | static void vmbus_process_offer(struct work_struct *work) |
3e7ee490 | 199 | { |
4b2f9abe TT |
200 | struct vmbus_channel *newchannel = container_of(work, |
201 | struct vmbus_channel, | |
202 | work); | |
aded7165 | 203 | struct vmbus_channel *channel; |
188963ec | 204 | bool fnew = true; |
bd60c33e | 205 | int ret; |
0f5e44ca | 206 | unsigned long flags; |
3e7ee490 | 207 | |
4b2f9abe TT |
208 | /* The next possible work is rescind handling */ |
209 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); | |
210 | ||
454f18a9 | 211 | /* Make sure this is a new offer */ |
15b2f647 | 212 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 213 | |
da9fcb72 | 214 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
215 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
216 | newchannel->offermsg.offer.if_type) && | |
217 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
218 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 219 | fnew = false; |
3e7ee490 HJ |
220 | break; |
221 | } | |
222 | } | |
223 | ||
188963ec | 224 | if (fnew) |
c50f7fb2 | 225 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 226 | &vmbus_connection.chn_list); |
bd60c33e | 227 | |
15b2f647 | 228 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 229 | |
188963ec | 230 | if (!fnew) { |
e98cb276 | 231 | free_channel(newchannel); |
3e7ee490 HJ |
232 | return; |
233 | } | |
234 | ||
bd60c33e GKH |
235 | /* |
236 | * Start the process of binding this offer to the driver | |
237 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 238 | * vmbus_child_dev_add() |
bd60c33e | 239 | */ |
f2c73011 | 240 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
241 | &newchannel->offermsg.offer.if_type, |
242 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 243 | newchannel); |
3e7ee490 | 244 | |
454f18a9 BP |
245 | /* |
246 | * Add the new device to the bus. This will kick off device-driver | |
247 | * binding which eventually invokes the device driver's AddDevice() | |
248 | * method. | |
249 | */ | |
22794281 | 250 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 251 | if (ret != 0) { |
0a46618d | 252 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 253 | newchannel->offermsg.child_relid); |
3e7ee490 | 254 | |
15b2f647 | 255 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 256 | list_del(&newchannel->listentry); |
15b2f647 | 257 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
8b8ee675 | 258 | kfree(newchannel->device_obj); |
3e7ee490 | 259 | |
e98cb276 | 260 | free_channel(newchannel); |
bd60c33e | 261 | } else { |
454f18a9 BP |
262 | /* |
263 | * This state is used to indicate a successful open | |
264 | * so that when we do close the channel normally, we | |
265 | * can cleanup properly | |
266 | */ | |
c50f7fb2 | 267 | newchannel->state = CHANNEL_OPEN_STATE; |
3e7ee490 | 268 | } |
3e7ee490 HJ |
269 | } |
270 | ||
a119845f S |
271 | enum { |
272 | IDE = 0, | |
273 | SCSI, | |
274 | NIC, | |
275 | MAX_PERF_CHN, | |
276 | }; | |
277 | ||
278 | /* | |
7fb96565 | 279 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
280 | * We attempt to distribute the interrupt load for these devices across |
281 | * all available CPUs. | |
282 | */ | |
7fb96565 | 283 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 284 | /* IDE */ |
7fb96565 | 285 | { HV_IDE_GUID, }, |
a119845f | 286 | /* Storage - SCSI */ |
7fb96565 | 287 | { HV_SCSI_GUID, }, |
a119845f | 288 | /* Network */ |
7fb96565 | 289 | { HV_NIC_GUID, }, |
a119845f S |
290 | }; |
291 | ||
292 | ||
293 | /* | |
294 | * We use this state to statically distribute the channel interrupt load. | |
295 | */ | |
296 | static u32 next_vp; | |
297 | ||
298 | /* | |
299 | * Starting with Win8, we can statically distribute the incoming | |
300 | * channel interrupt load by binding a channel to VCPU. We | |
301 | * implement here a simple round robin scheme for distributing | |
302 | * the interrupt load. | |
303 | * We will bind channels that are not performance critical to cpu 0 and | |
304 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
305 | * distributed across all available CPUs. | |
306 | */ | |
307 | static u32 get_vp_index(uuid_le *type_guid) | |
308 | { | |
309 | u32 cur_cpu; | |
310 | int i; | |
311 | bool perf_chn = false; | |
312 | u32 max_cpus = num_online_cpus(); | |
313 | ||
314 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 315 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
316 | sizeof(uuid_le))) { |
317 | perf_chn = true; | |
318 | break; | |
319 | } | |
320 | } | |
321 | if ((vmbus_proto_version == VERSION_WS2008) || | |
322 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
323 | /* | |
324 | * Prior to win8, all channel interrupts are | |
325 | * delivered on cpu 0. | |
326 | * Also if the channel is not a performance critical | |
327 | * channel, bind it to cpu 0. | |
328 | */ | |
329 | return 0; | |
330 | } | |
331 | cur_cpu = (++next_vp % max_cpus); | |
d2242a38 | 332 | return hv_context.vp_index[cur_cpu]; |
a119845f S |
333 | } |
334 | ||
3e189519 | 335 | /* |
e98cb276 | 336 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 337 | * |
bd60c33e | 338 | */ |
e98cb276 | 339 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 340 | { |
bd60c33e | 341 | struct vmbus_channel_offer_channel *offer; |
188963ec | 342 | struct vmbus_channel *newchannel; |
3e7ee490 | 343 | |
bd60c33e | 344 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 345 | |
454f18a9 | 346 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 347 | newchannel = alloc_channel(); |
188963ec | 348 | if (!newchannel) { |
0a46618d | 349 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
350 | return; |
351 | } | |
352 | ||
132368bd S |
353 | /* |
354 | * By default we setup state to enable batched | |
355 | * reading. A specific service can choose to | |
356 | * disable this prior to opening the channel. | |
357 | */ | |
358 | newchannel->batched_reading = true; | |
359 | ||
b3bf60c7 S |
360 | /* |
361 | * Setup state for signalling the host. | |
362 | */ | |
363 | newchannel->sig_event = (struct hv_input_signal_event *) | |
364 | (ALIGN((unsigned long) | |
365 | &newchannel->sig_buf, | |
366 | HV_HYPERCALL_PARAM_ALIGN)); | |
367 | ||
368 | newchannel->sig_event->connectionid.asu32 = 0; | |
369 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
370 | newchannel->sig_event->flag_number = 0; | |
371 | newchannel->sig_event->rsvdz = 0; | |
372 | ||
373 | if (vmbus_proto_version != VERSION_WS2008) { | |
374 | newchannel->is_dedicated_interrupt = | |
375 | (offer->is_dedicated_interrupt != 0); | |
376 | newchannel->sig_event->connectionid.u.id = | |
377 | offer->connection_id; | |
378 | } | |
379 | ||
a119845f | 380 | newchannel->target_vp = get_vp_index(&offer->offer.if_type); |
abbf3b2a | 381 | |
c50f7fb2 | 382 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 383 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
384 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
385 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 386 | |
4b2f9abe TT |
387 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
388 | queue_work(newchannel->controlwq, &newchannel->work); | |
3e7ee490 HJ |
389 | } |
390 | ||
3e189519 | 391 | /* |
e98cb276 | 392 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
393 | * |
394 | * We queue a work item to process this offer synchronously | |
395 | */ | |
e98cb276 | 396 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 397 | { |
bd60c33e | 398 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 399 | struct vmbus_channel *channel; |
3e7ee490 | 400 | |
bd60c33e | 401 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 402 | channel = relid2channel(rescind->child_relid); |
98e08702 HJ |
403 | |
404 | if (channel == NULL) | |
405 | /* Just return here, no channel found */ | |
3e7ee490 | 406 | return; |
3e7ee490 | 407 | |
4b2f9abe TT |
408 | /* work is initialized for vmbus_process_rescind_offer() from |
409 | * vmbus_process_offer() where the channel got created */ | |
410 | queue_work(channel->controlwq, &channel->work); | |
3e7ee490 HJ |
411 | } |
412 | ||
3e189519 | 413 | /* |
e98cb276 HZ |
414 | * vmbus_onoffers_delivered - |
415 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
416 | * |
417 | * Nothing to do here. | |
418 | */ | |
e98cb276 | 419 | static void vmbus_onoffers_delivered( |
bd60c33e | 420 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 421 | { |
3e7ee490 HJ |
422 | } |
423 | ||
3e189519 | 424 | /* |
e98cb276 | 425 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
426 | * |
427 | * This is invoked when we received a response to our channel open request. | |
428 | * Find the matching request, copy the response and signal the requesting | |
429 | * thread. | |
430 | */ | |
e98cb276 | 431 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 432 | { |
bd60c33e | 433 | struct vmbus_channel_open_result *result; |
188963ec HZ |
434 | struct vmbus_channel_msginfo *msginfo; |
435 | struct vmbus_channel_message_header *requestheader; | |
436 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 437 | unsigned long flags; |
3e7ee490 | 438 | |
bd60c33e | 439 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 440 | |
bd60c33e GKH |
441 | /* |
442 | * Find the open msg, copy the result and signal/unblock the wait event | |
443 | */ | |
15b2f647 | 444 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 445 | |
ebb61e5f HJ |
446 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
447 | msglistentry) { | |
188963ec | 448 | requestheader = |
c50f7fb2 | 449 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 450 | |
c50f7fb2 | 451 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 452 | openmsg = |
c50f7fb2 HZ |
453 | (struct vmbus_channel_open_channel *)msginfo->msg; |
454 | if (openmsg->child_relid == result->child_relid && | |
455 | openmsg->openid == result->openid) { | |
456 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 457 | result, |
9568a193 S |
458 | sizeof( |
459 | struct vmbus_channel_open_result)); | |
460 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
461 | break; |
462 | } | |
463 | } | |
464 | } | |
15b2f647 | 465 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
466 | } |
467 | ||
3e189519 | 468 | /* |
e98cb276 | 469 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
470 | * |
471 | * This is invoked when we received a response to our gpadl create request. | |
472 | * Find the matching request, copy the response and signal the requesting | |
473 | * thread. | |
474 | */ | |
e98cb276 | 475 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 476 | { |
188963ec | 477 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
478 | struct vmbus_channel_msginfo *msginfo; |
479 | struct vmbus_channel_message_header *requestheader; | |
480 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 481 | unsigned long flags; |
3e7ee490 | 482 | |
188963ec | 483 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 484 | |
bd60c33e GKH |
485 | /* |
486 | * Find the establish msg, copy the result and signal/unblock the wait | |
487 | * event | |
488 | */ | |
15b2f647 | 489 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 490 | |
ebb61e5f HJ |
491 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
492 | msglistentry) { | |
188963ec | 493 | requestheader = |
c50f7fb2 | 494 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 495 | |
c50f7fb2 | 496 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
497 | gpadlheader = |
498 | (struct vmbus_channel_gpadl_header *)requestheader; | |
499 | ||
c50f7fb2 HZ |
500 | if ((gpadlcreated->child_relid == |
501 | gpadlheader->child_relid) && | |
502 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
503 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 504 | gpadlcreated, |
9568a193 S |
505 | sizeof( |
506 | struct vmbus_channel_gpadl_created)); | |
507 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
508 | break; |
509 | } | |
510 | } | |
511 | } | |
15b2f647 | 512 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
513 | } |
514 | ||
3e189519 | 515 | /* |
e98cb276 | 516 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
517 | * |
518 | * This is invoked when we received a response to our gpadl teardown request. | |
519 | * Find the matching request, copy the response and signal the requesting | |
520 | * thread. | |
521 | */ | |
e98cb276 | 522 | static void vmbus_ongpadl_torndown( |
bd60c33e | 523 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 524 | { |
188963ec | 525 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
526 | struct vmbus_channel_msginfo *msginfo; |
527 | struct vmbus_channel_message_header *requestheader; | |
528 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 529 | unsigned long flags; |
3e7ee490 | 530 | |
188963ec | 531 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
532 | |
533 | /* | |
534 | * Find the open msg, copy the result and signal/unblock the wait event | |
535 | */ | |
15b2f647 | 536 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 537 | |
ebb61e5f HJ |
538 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
539 | msglistentry) { | |
188963ec | 540 | requestheader = |
c50f7fb2 | 541 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 542 | |
c50f7fb2 | 543 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
544 | gpadl_teardown = |
545 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 546 | |
c50f7fb2 HZ |
547 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
548 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 549 | gpadl_torndown, |
9568a193 S |
550 | sizeof( |
551 | struct vmbus_channel_gpadl_torndown)); | |
552 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
553 | break; |
554 | } | |
555 | } | |
556 | } | |
15b2f647 | 557 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
558 | } |
559 | ||
3e189519 | 560 | /* |
e98cb276 | 561 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
562 | * |
563 | * This is invoked when we received a response to our initiate contact request. | |
564 | * Find the matching request, copy the response and signal the requesting | |
565 | * thread. | |
566 | */ | |
e98cb276 | 567 | static void vmbus_onversion_response( |
bd60c33e | 568 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 569 | { |
188963ec HZ |
570 | struct vmbus_channel_msginfo *msginfo; |
571 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 572 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 573 | unsigned long flags; |
3e7ee490 | 574 | |
188963ec | 575 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 576 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 577 | |
ebb61e5f HJ |
578 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
579 | msglistentry) { | |
188963ec | 580 | requestheader = |
c50f7fb2 | 581 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 582 | |
c50f7fb2 HZ |
583 | if (requestheader->msgtype == |
584 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 585 | memcpy(&msginfo->response.version_response, |
188963ec | 586 | version_response, |
bd60c33e | 587 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 588 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
589 | } |
590 | } | |
15b2f647 | 591 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
592 | } |
593 | ||
c8212f04 GKH |
594 | /* Channel message dispatch table */ |
595 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 596 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
597 | {CHANNELMSG_INVALID, NULL}, |
598 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
599 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
600 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
601 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
602 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
603 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
604 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
605 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
606 | {CHANNELMSG_GPADL_BODY, NULL}, | |
607 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
608 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
609 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
610 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
611 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
612 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
613 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
614 | }; |
615 | ||
3e189519 | 616 | /* |
e98cb276 | 617 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
618 | * |
619 | * This is invoked in the vmbus worker thread context. | |
620 | */ | |
e98cb276 | 621 | void vmbus_onmessage(void *context) |
3e7ee490 | 622 | { |
188963ec | 623 | struct hv_message *msg = context; |
82250213 | 624 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
625 | int size; |
626 | ||
f6feebe0 HZ |
627 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
628 | size = msg->header.payload_size; | |
3e7ee490 | 629 | |
c50f7fb2 | 630 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 631 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 632 | hdr->msgtype, size); |
04f50c4d | 633 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 634 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
635 | return; |
636 | } | |
637 | ||
b7c6b02f S |
638 | if (channel_message_table[hdr->msgtype].message_handler) |
639 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 640 | else |
0a46618d | 641 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
642 | } |
643 | ||
3e189519 | 644 | /* |
e98cb276 | 645 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 646 | */ |
e98cb276 | 647 | int vmbus_request_offers(void) |
3e7ee490 | 648 | { |
82250213 | 649 | struct vmbus_channel_message_header *msg; |
188963ec | 650 | struct vmbus_channel_msginfo *msginfo; |
9568a193 | 651 | int ret, t; |
3e7ee490 | 652 | |
188963ec | 653 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
654 | sizeof(struct vmbus_channel_message_header), |
655 | GFP_KERNEL); | |
188963ec | 656 | if (!msginfo) |
75910f23 | 657 | return -ENOMEM; |
3e7ee490 | 658 | |
9568a193 | 659 | init_completion(&msginfo->waitevent); |
75910f23 | 660 | |
c50f7fb2 | 661 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 662 | |
c50f7fb2 | 663 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 664 | |
3e7ee490 | 665 | |
c6977677 | 666 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
667 | sizeof(struct vmbus_channel_message_header)); |
668 | if (ret != 0) { | |
0a46618d | 669 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 670 | |
0c3b7b2f S |
671 | goto cleanup; |
672 | } | |
3e7ee490 | 673 | |
2dfde964 | 674 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 675 | if (t == 0) { |
0c3b7b2f S |
676 | ret = -ETIMEDOUT; |
677 | goto cleanup; | |
3e7ee490 | 678 | } |
3e7ee490 | 679 | |
3e7ee490 HJ |
680 | |
681 | ||
0c3b7b2f | 682 | cleanup: |
dd9b15dc | 683 | kfree(msginfo); |
3e7ee490 | 684 | |
3e7ee490 HJ |
685 | return ret; |
686 | } | |
687 | ||
454f18a9 | 688 | /* eof */ |