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 | * | |
6741335b S |
51 | * The fw_version specifies the framework version that |
52 | * we can support and srv_version specifies the service | |
53 | * version we can support. | |
c88c4e4c HJ |
54 | * |
55 | * Mainly used by Hyper-V drivers. | |
56 | */ | |
6741335b | 57 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 58 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 59 | int fw_version, int srv_version) |
c88c4e4c | 60 | { |
6741335b S |
61 | int icframe_major, icframe_minor; |
62 | int icmsg_major, icmsg_minor; | |
63 | int fw_major, fw_minor; | |
64 | int srv_major, srv_minor; | |
c836d0ab | 65 | int i; |
6741335b | 66 | bool found_match = false; |
c836d0ab | 67 | |
a3605300 | 68 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
69 | fw_major = (fw_version >> 16); |
70 | fw_minor = (fw_version & 0xFFFF); | |
71 | ||
72 | srv_major = (srv_version >> 16); | |
73 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 74 | |
a3605300 S |
75 | negop = (struct icmsg_negotiate *)&buf[ |
76 | sizeof(struct vmbuspipe_hdr) + | |
77 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 78 | |
6741335b S |
79 | icframe_major = negop->icframe_vercnt; |
80 | icframe_minor = 0; | |
81 | ||
82 | icmsg_major = negop->icmsg_vercnt; | |
83 | icmsg_minor = 0; | |
c836d0ab S |
84 | |
85 | /* | |
86 | * Select the framework version number we will | |
87 | * support. | |
88 | */ | |
89 | ||
90 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
91 | 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 | } | |
c836d0ab S |
97 | } |
98 | ||
6741335b S |
99 | if (!found_match) |
100 | goto fw_error; | |
101 | ||
102 | found_match = false; | |
103 | ||
c836d0ab S |
104 | for (i = negop->icframe_vercnt; |
105 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
106 | 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 | } | |
c88c4e4c | 112 | } |
a3605300 | 113 | |
c836d0ab | 114 | /* |
6741335b | 115 | * Respond with the framework and service |
c836d0ab S |
116 | * version numbers we can support. |
117 | */ | |
6741335b S |
118 | |
119 | fw_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; | |
c88c4e4c | 133 | } |
a3605300 | 134 | |
da0e9631 | 135 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 136 | |
3e189519 | 137 | /* |
e98cb276 | 138 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 139 | */ |
50fe56d2 | 140 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 141 | { |
aded7165 | 142 | struct vmbus_channel *channel; |
3e7ee490 | 143 | |
aded7165 | 144 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 145 | if (!channel) |
3e7ee490 | 146 | return NULL; |
3e7ee490 | 147 | |
54411c42 | 148 | spin_lock_init(&channel->inbound_lock); |
e68d2971 S |
149 | spin_lock_init(&channel->sc_lock); |
150 | ||
151 | INIT_LIST_HEAD(&channel->sc_list); | |
3e7ee490 | 152 | |
c50f7fb2 HZ |
153 | channel->controlwq = create_workqueue("hv_vmbus_ctl"); |
154 | if (!channel->controlwq) { | |
8c69f52a | 155 | kfree(channel); |
3e7ee490 HJ |
156 | return NULL; |
157 | } | |
158 | ||
159 | return channel; | |
160 | } | |
161 | ||
3e189519 | 162 | /* |
e98cb276 | 163 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 164 | */ |
4b2f9abe | 165 | static void release_channel(struct work_struct *work) |
3e7ee490 | 166 | { |
4b2f9abe TT |
167 | struct vmbus_channel *channel = container_of(work, |
168 | struct vmbus_channel, | |
169 | work); | |
3e7ee490 | 170 | |
c50f7fb2 | 171 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 172 | |
8c69f52a | 173 | kfree(channel); |
3e7ee490 HJ |
174 | } |
175 | ||
3e189519 | 176 | /* |
e98cb276 | 177 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 178 | */ |
9f3e28e3 | 179 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 180 | { |
3e7ee490 | 181 | |
bd60c33e GKH |
182 | /* |
183 | * We have to release the channel's workqueue/thread in the vmbus's | |
184 | * workqueue/thread context | |
185 | * ie we can't destroy ourselves. | |
186 | */ | |
4b2f9abe | 187 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 188 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
189 | } |
190 | ||
8b5d6d3b | 191 | |
8b5d6d3b | 192 | |
4b2f9abe TT |
193 | /* |
194 | * vmbus_process_rescind_offer - | |
195 | * Rescind the offer by initiating a device removal | |
196 | */ | |
197 | static void vmbus_process_rescind_offer(struct work_struct *work) | |
198 | { | |
199 | struct vmbus_channel *channel = container_of(work, | |
200 | struct vmbus_channel, | |
201 | work); | |
c8705979 | 202 | unsigned long flags; |
e68d2971 | 203 | struct vmbus_channel *primary_channel; |
c8705979 | 204 | struct vmbus_channel_relid_released msg; |
4b2f9abe | 205 | |
565ce642 S |
206 | if (channel->device_obj) |
207 | vmbus_device_unregister(channel->device_obj); | |
c8705979 S |
208 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
209 | msg.child_relid = channel->offermsg.child_relid; | |
210 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; | |
211 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
212 | ||
e68d2971 S |
213 | if (channel->primary_channel == NULL) { |
214 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
215 | list_del(&channel->listentry); | |
216 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
217 | } else { | |
218 | primary_channel = channel->primary_channel; | |
219 | spin_lock_irqsave(&primary_channel->sc_lock, flags); | |
565ce642 | 220 | list_del(&channel->sc_list); |
e68d2971 S |
221 | spin_unlock_irqrestore(&primary_channel->sc_lock, flags); |
222 | } | |
c8705979 | 223 | free_channel(channel); |
4b2f9abe | 224 | } |
8b5d6d3b | 225 | |
93e5bd06 S |
226 | void vmbus_free_channels(void) |
227 | { | |
228 | struct vmbus_channel *channel; | |
229 | ||
230 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
231 | vmbus_device_unregister(channel->device_obj); | |
232 | kfree(channel->device_obj); | |
233 | free_channel(channel); | |
234 | } | |
235 | } | |
236 | ||
3e189519 | 237 | /* |
e98cb276 | 238 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 239 | * associated with this offer |
bd60c33e | 240 | */ |
4b2f9abe | 241 | static void vmbus_process_offer(struct work_struct *work) |
3e7ee490 | 242 | { |
4b2f9abe TT |
243 | struct vmbus_channel *newchannel = container_of(work, |
244 | struct vmbus_channel, | |
245 | work); | |
aded7165 | 246 | struct vmbus_channel *channel; |
188963ec | 247 | bool fnew = true; |
bd60c33e | 248 | int ret; |
0f5e44ca | 249 | unsigned long flags; |
3e7ee490 | 250 | |
4b2f9abe TT |
251 | /* The next possible work is rescind handling */ |
252 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); | |
253 | ||
454f18a9 | 254 | /* Make sure this is a new offer */ |
15b2f647 | 255 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 256 | |
da9fcb72 | 257 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
258 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
259 | newchannel->offermsg.offer.if_type) && | |
260 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
261 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 262 | fnew = false; |
3e7ee490 HJ |
263 | break; |
264 | } | |
265 | } | |
266 | ||
188963ec | 267 | if (fnew) |
c50f7fb2 | 268 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 269 | &vmbus_connection.chn_list); |
bd60c33e | 270 | |
15b2f647 | 271 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 272 | |
188963ec | 273 | if (!fnew) { |
e68d2971 S |
274 | /* |
275 | * Check to see if this is a sub-channel. | |
276 | */ | |
277 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
278 | /* | |
279 | * Process the sub-channel. | |
280 | */ | |
281 | newchannel->primary_channel = channel; | |
282 | spin_lock_irqsave(&channel->sc_lock, flags); | |
283 | list_add_tail(&newchannel->sc_list, &channel->sc_list); | |
284 | spin_unlock_irqrestore(&channel->sc_lock, flags); | |
285 | newchannel->state = CHANNEL_OPEN_STATE; | |
286 | if (channel->sc_creation_callback != NULL) | |
287 | channel->sc_creation_callback(newchannel); | |
288 | ||
289 | return; | |
290 | } | |
291 | ||
e98cb276 | 292 | free_channel(newchannel); |
3e7ee490 HJ |
293 | return; |
294 | } | |
295 | ||
42dceebe S |
296 | /* |
297 | * This state is used to indicate a successful open | |
298 | * so that when we do close the channel normally, we | |
299 | * can cleanup properly | |
300 | */ | |
301 | newchannel->state = CHANNEL_OPEN_STATE; | |
302 | ||
bd60c33e GKH |
303 | /* |
304 | * Start the process of binding this offer to the driver | |
305 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 306 | * vmbus_child_dev_add() |
bd60c33e | 307 | */ |
f2c73011 | 308 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
309 | &newchannel->offermsg.offer.if_type, |
310 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 311 | newchannel); |
3e7ee490 | 312 | |
454f18a9 BP |
313 | /* |
314 | * Add the new device to the bus. This will kick off device-driver | |
315 | * binding which eventually invokes the device driver's AddDevice() | |
316 | * method. | |
317 | */ | |
22794281 | 318 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 319 | if (ret != 0) { |
0a46618d | 320 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 321 | newchannel->offermsg.child_relid); |
3e7ee490 | 322 | |
15b2f647 | 323 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 324 | list_del(&newchannel->listentry); |
15b2f647 | 325 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
8b8ee675 | 326 | kfree(newchannel->device_obj); |
3e7ee490 | 327 | |
e98cb276 | 328 | free_channel(newchannel); |
3e7ee490 | 329 | } |
3e7ee490 HJ |
330 | } |
331 | ||
a119845f S |
332 | enum { |
333 | IDE = 0, | |
334 | SCSI, | |
335 | NIC, | |
336 | MAX_PERF_CHN, | |
337 | }; | |
338 | ||
339 | /* | |
7fb96565 | 340 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
341 | * We attempt to distribute the interrupt load for these devices across |
342 | * all available CPUs. | |
343 | */ | |
7fb96565 | 344 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 345 | /* IDE */ |
7fb96565 | 346 | { HV_IDE_GUID, }, |
a119845f | 347 | /* Storage - SCSI */ |
7fb96565 | 348 | { HV_SCSI_GUID, }, |
a119845f | 349 | /* Network */ |
7fb96565 | 350 | { HV_NIC_GUID, }, |
a119845f S |
351 | }; |
352 | ||
353 | ||
354 | /* | |
355 | * We use this state to statically distribute the channel interrupt load. | |
356 | */ | |
357 | static u32 next_vp; | |
358 | ||
359 | /* | |
360 | * Starting with Win8, we can statically distribute the incoming | |
361 | * channel interrupt load by binding a channel to VCPU. We | |
362 | * implement here a simple round robin scheme for distributing | |
363 | * the interrupt load. | |
364 | * We will bind channels that are not performance critical to cpu 0 and | |
365 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
366 | * distributed across all available CPUs. | |
367 | */ | |
368 | static u32 get_vp_index(uuid_le *type_guid) | |
369 | { | |
370 | u32 cur_cpu; | |
371 | int i; | |
372 | bool perf_chn = false; | |
373 | u32 max_cpus = num_online_cpus(); | |
374 | ||
375 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 376 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
377 | sizeof(uuid_le))) { |
378 | perf_chn = true; | |
379 | break; | |
380 | } | |
381 | } | |
382 | if ((vmbus_proto_version == VERSION_WS2008) || | |
383 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
384 | /* | |
385 | * Prior to win8, all channel interrupts are | |
386 | * delivered on cpu 0. | |
387 | * Also if the channel is not a performance critical | |
388 | * channel, bind it to cpu 0. | |
389 | */ | |
390 | return 0; | |
391 | } | |
392 | cur_cpu = (++next_vp % max_cpus); | |
d2242a38 | 393 | return hv_context.vp_index[cur_cpu]; |
a119845f S |
394 | } |
395 | ||
3e189519 | 396 | /* |
e98cb276 | 397 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 398 | * |
bd60c33e | 399 | */ |
e98cb276 | 400 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 401 | { |
bd60c33e | 402 | struct vmbus_channel_offer_channel *offer; |
188963ec | 403 | struct vmbus_channel *newchannel; |
3e7ee490 | 404 | |
bd60c33e | 405 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 406 | |
454f18a9 | 407 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 408 | newchannel = alloc_channel(); |
188963ec | 409 | if (!newchannel) { |
0a46618d | 410 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
411 | return; |
412 | } | |
413 | ||
132368bd S |
414 | /* |
415 | * By default we setup state to enable batched | |
416 | * reading. A specific service can choose to | |
417 | * disable this prior to opening the channel. | |
418 | */ | |
419 | newchannel->batched_reading = true; | |
420 | ||
b3bf60c7 S |
421 | /* |
422 | * Setup state for signalling the host. | |
423 | */ | |
424 | newchannel->sig_event = (struct hv_input_signal_event *) | |
425 | (ALIGN((unsigned long) | |
426 | &newchannel->sig_buf, | |
427 | HV_HYPERCALL_PARAM_ALIGN)); | |
428 | ||
429 | newchannel->sig_event->connectionid.asu32 = 0; | |
430 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
431 | newchannel->sig_event->flag_number = 0; | |
432 | newchannel->sig_event->rsvdz = 0; | |
433 | ||
434 | if (vmbus_proto_version != VERSION_WS2008) { | |
435 | newchannel->is_dedicated_interrupt = | |
436 | (offer->is_dedicated_interrupt != 0); | |
437 | newchannel->sig_event->connectionid.u.id = | |
438 | offer->connection_id; | |
439 | } | |
440 | ||
a119845f | 441 | newchannel->target_vp = get_vp_index(&offer->offer.if_type); |
abbf3b2a | 442 | |
c50f7fb2 | 443 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 444 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
445 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
446 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 447 | |
4b2f9abe TT |
448 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
449 | queue_work(newchannel->controlwq, &newchannel->work); | |
3e7ee490 HJ |
450 | } |
451 | ||
3e189519 | 452 | /* |
e98cb276 | 453 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
454 | * |
455 | * We queue a work item to process this offer synchronously | |
456 | */ | |
e98cb276 | 457 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 458 | { |
bd60c33e | 459 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 460 | struct vmbus_channel *channel; |
3e7ee490 | 461 | |
bd60c33e | 462 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 463 | channel = relid2channel(rescind->child_relid); |
98e08702 HJ |
464 | |
465 | if (channel == NULL) | |
466 | /* Just return here, no channel found */ | |
3e7ee490 | 467 | return; |
3e7ee490 | 468 | |
4b2f9abe TT |
469 | /* work is initialized for vmbus_process_rescind_offer() from |
470 | * vmbus_process_offer() where the channel got created */ | |
471 | queue_work(channel->controlwq, &channel->work); | |
3e7ee490 HJ |
472 | } |
473 | ||
3e189519 | 474 | /* |
e98cb276 HZ |
475 | * vmbus_onoffers_delivered - |
476 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
477 | * |
478 | * Nothing to do here. | |
479 | */ | |
e98cb276 | 480 | static void vmbus_onoffers_delivered( |
bd60c33e | 481 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 482 | { |
3e7ee490 HJ |
483 | } |
484 | ||
3e189519 | 485 | /* |
e98cb276 | 486 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
487 | * |
488 | * This is invoked when we received a response to our channel open request. | |
489 | * Find the matching request, copy the response and signal the requesting | |
490 | * thread. | |
491 | */ | |
e98cb276 | 492 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 493 | { |
bd60c33e | 494 | struct vmbus_channel_open_result *result; |
188963ec HZ |
495 | struct vmbus_channel_msginfo *msginfo; |
496 | struct vmbus_channel_message_header *requestheader; | |
497 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 498 | unsigned long flags; |
3e7ee490 | 499 | |
bd60c33e | 500 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 501 | |
bd60c33e GKH |
502 | /* |
503 | * Find the open msg, copy the result and signal/unblock the wait event | |
504 | */ | |
15b2f647 | 505 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 506 | |
ebb61e5f HJ |
507 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
508 | msglistentry) { | |
188963ec | 509 | requestheader = |
c50f7fb2 | 510 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 511 | |
c50f7fb2 | 512 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 513 | openmsg = |
c50f7fb2 HZ |
514 | (struct vmbus_channel_open_channel *)msginfo->msg; |
515 | if (openmsg->child_relid == result->child_relid && | |
516 | openmsg->openid == result->openid) { | |
517 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 518 | result, |
9568a193 S |
519 | sizeof( |
520 | struct vmbus_channel_open_result)); | |
521 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
522 | break; |
523 | } | |
524 | } | |
525 | } | |
15b2f647 | 526 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
527 | } |
528 | ||
3e189519 | 529 | /* |
e98cb276 | 530 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
531 | * |
532 | * This is invoked when we received a response to our gpadl create request. | |
533 | * Find the matching request, copy the response and signal the requesting | |
534 | * thread. | |
535 | */ | |
e98cb276 | 536 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 537 | { |
188963ec | 538 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
539 | struct vmbus_channel_msginfo *msginfo; |
540 | struct vmbus_channel_message_header *requestheader; | |
541 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 542 | unsigned long flags; |
3e7ee490 | 543 | |
188963ec | 544 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 545 | |
bd60c33e GKH |
546 | /* |
547 | * Find the establish msg, copy the result and signal/unblock the wait | |
548 | * event | |
549 | */ | |
15b2f647 | 550 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 551 | |
ebb61e5f HJ |
552 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
553 | msglistentry) { | |
188963ec | 554 | requestheader = |
c50f7fb2 | 555 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 556 | |
c50f7fb2 | 557 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
558 | gpadlheader = |
559 | (struct vmbus_channel_gpadl_header *)requestheader; | |
560 | ||
c50f7fb2 HZ |
561 | if ((gpadlcreated->child_relid == |
562 | gpadlheader->child_relid) && | |
563 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
564 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 565 | gpadlcreated, |
9568a193 S |
566 | sizeof( |
567 | struct vmbus_channel_gpadl_created)); | |
568 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
569 | break; |
570 | } | |
571 | } | |
572 | } | |
15b2f647 | 573 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
574 | } |
575 | ||
3e189519 | 576 | /* |
e98cb276 | 577 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
578 | * |
579 | * This is invoked when we received a response to our gpadl teardown request. | |
580 | * Find the matching request, copy the response and signal the requesting | |
581 | * thread. | |
582 | */ | |
e98cb276 | 583 | static void vmbus_ongpadl_torndown( |
bd60c33e | 584 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 585 | { |
188963ec | 586 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
587 | struct vmbus_channel_msginfo *msginfo; |
588 | struct vmbus_channel_message_header *requestheader; | |
589 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 590 | unsigned long flags; |
3e7ee490 | 591 | |
188963ec | 592 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
593 | |
594 | /* | |
595 | * Find the open msg, copy the result and signal/unblock the wait event | |
596 | */ | |
15b2f647 | 597 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 598 | |
ebb61e5f HJ |
599 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
600 | msglistentry) { | |
188963ec | 601 | requestheader = |
c50f7fb2 | 602 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 603 | |
c50f7fb2 | 604 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
605 | gpadl_teardown = |
606 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 607 | |
c50f7fb2 HZ |
608 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
609 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 610 | gpadl_torndown, |
9568a193 S |
611 | sizeof( |
612 | struct vmbus_channel_gpadl_torndown)); | |
613 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
614 | break; |
615 | } | |
616 | } | |
617 | } | |
15b2f647 | 618 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
619 | } |
620 | ||
3e189519 | 621 | /* |
e98cb276 | 622 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
623 | * |
624 | * This is invoked when we received a response to our initiate contact request. | |
625 | * Find the matching request, copy the response and signal the requesting | |
626 | * thread. | |
627 | */ | |
e98cb276 | 628 | static void vmbus_onversion_response( |
bd60c33e | 629 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 630 | { |
188963ec HZ |
631 | struct vmbus_channel_msginfo *msginfo; |
632 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 633 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 634 | unsigned long flags; |
3e7ee490 | 635 | |
188963ec | 636 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 637 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 638 | |
ebb61e5f HJ |
639 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
640 | msglistentry) { | |
188963ec | 641 | requestheader = |
c50f7fb2 | 642 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 643 | |
c50f7fb2 HZ |
644 | if (requestheader->msgtype == |
645 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 646 | memcpy(&msginfo->response.version_response, |
188963ec | 647 | version_response, |
bd60c33e | 648 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 649 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
650 | } |
651 | } | |
15b2f647 | 652 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
653 | } |
654 | ||
c8212f04 GKH |
655 | /* Channel message dispatch table */ |
656 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 657 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
658 | {CHANNELMSG_INVALID, NULL}, |
659 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
660 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
661 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
662 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
663 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
664 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
665 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
666 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
667 | {CHANNELMSG_GPADL_BODY, NULL}, | |
668 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
669 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
670 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
671 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
672 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
673 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
674 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
675 | }; |
676 | ||
3e189519 | 677 | /* |
e98cb276 | 678 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
679 | * |
680 | * This is invoked in the vmbus worker thread context. | |
681 | */ | |
e98cb276 | 682 | void vmbus_onmessage(void *context) |
3e7ee490 | 683 | { |
188963ec | 684 | struct hv_message *msg = context; |
82250213 | 685 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
686 | int size; |
687 | ||
f6feebe0 HZ |
688 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
689 | size = msg->header.payload_size; | |
3e7ee490 | 690 | |
c50f7fb2 | 691 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 692 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 693 | hdr->msgtype, size); |
04f50c4d | 694 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 695 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
696 | return; |
697 | } | |
698 | ||
b7c6b02f S |
699 | if (channel_message_table[hdr->msgtype].message_handler) |
700 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 701 | else |
0a46618d | 702 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
703 | } |
704 | ||
3e189519 | 705 | /* |
e98cb276 | 706 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 707 | */ |
e98cb276 | 708 | int vmbus_request_offers(void) |
3e7ee490 | 709 | { |
82250213 | 710 | struct vmbus_channel_message_header *msg; |
188963ec | 711 | struct vmbus_channel_msginfo *msginfo; |
9568a193 | 712 | int ret, t; |
3e7ee490 | 713 | |
188963ec | 714 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
715 | sizeof(struct vmbus_channel_message_header), |
716 | GFP_KERNEL); | |
188963ec | 717 | if (!msginfo) |
75910f23 | 718 | return -ENOMEM; |
3e7ee490 | 719 | |
9568a193 | 720 | init_completion(&msginfo->waitevent); |
75910f23 | 721 | |
c50f7fb2 | 722 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 723 | |
c50f7fb2 | 724 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 725 | |
3e7ee490 | 726 | |
c6977677 | 727 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
728 | sizeof(struct vmbus_channel_message_header)); |
729 | if (ret != 0) { | |
0a46618d | 730 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 731 | |
0c3b7b2f S |
732 | goto cleanup; |
733 | } | |
3e7ee490 | 734 | |
2dfde964 | 735 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 736 | if (t == 0) { |
0c3b7b2f S |
737 | ret = -ETIMEDOUT; |
738 | goto cleanup; | |
3e7ee490 | 739 | } |
3e7ee490 | 740 | |
3e7ee490 HJ |
741 | |
742 | ||
0c3b7b2f | 743 | cleanup: |
dd9b15dc | 744 | kfree(msginfo); |
3e7ee490 | 745 | |
3e7ee490 HJ |
746 | return ret; |
747 | } | |
748 | ||
e68d2971 S |
749 | /* |
750 | * Retrieve the (sub) channel on which to send an outgoing request. | |
751 | * When a primary channel has multiple sub-channels, we choose a | |
752 | * channel whose VCPU binding is closest to the VCPU on which | |
753 | * this call is being made. | |
754 | */ | |
755 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
756 | { | |
757 | struct list_head *cur, *tmp; | |
758 | int cur_cpu = hv_context.vp_index[smp_processor_id()]; | |
759 | struct vmbus_channel *cur_channel; | |
760 | struct vmbus_channel *outgoing_channel = primary; | |
761 | int cpu_distance, new_cpu_distance; | |
762 | ||
763 | if (list_empty(&primary->sc_list)) | |
764 | return outgoing_channel; | |
765 | ||
766 | list_for_each_safe(cur, tmp, &primary->sc_list) { | |
767 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
768 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
769 | continue; | |
770 | ||
771 | if (cur_channel->target_vp == cur_cpu) | |
772 | return cur_channel; | |
773 | ||
774 | cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ? | |
775 | (outgoing_channel->target_vp - cur_cpu) : | |
776 | (cur_cpu - outgoing_channel->target_vp)); | |
777 | ||
778 | new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ? | |
779 | (cur_channel->target_vp - cur_cpu) : | |
780 | (cur_cpu - cur_channel->target_vp)); | |
781 | ||
782 | if (cpu_distance < new_cpu_distance) | |
783 | continue; | |
784 | ||
785 | outgoing_channel = cur_channel; | |
786 | } | |
787 | ||
788 | return outgoing_channel; | |
789 | } | |
790 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
791 | ||
792 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
793 | { | |
794 | struct list_head *cur, *tmp; | |
795 | struct vmbus_channel *cur_channel; | |
796 | ||
797 | if (primary_channel->sc_creation_callback == NULL) | |
798 | return; | |
799 | ||
800 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
801 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
802 | ||
803 | primary_channel->sc_creation_callback(cur_channel); | |
804 | } | |
805 | } | |
806 | ||
807 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
808 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
809 | { | |
810 | primary_channel->sc_creation_callback = sc_cr_cb; | |
811 | } | |
812 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
813 | ||
814 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
815 | { | |
816 | bool ret; | |
817 | ||
818 | ret = !list_empty(&primary->sc_list); | |
819 | ||
820 | if (ret) { | |
821 | /* | |
822 | * Invoke the callback on sub-channel creation. | |
823 | * This will present a uniform interface to the | |
824 | * clients. | |
825 | */ | |
826 | invoke_sc_cb(primary); | |
827 | } | |
828 | ||
829 | return ret; | |
830 | } | |
831 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |