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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> |
638fea33 | 24 | #include <linux/interrupt.h> |
0c3b7b2f S |
25 | #include <linux/sched.h> |
26 | #include <linux/wait.h> | |
a0086dc5 | 27 | #include <linux/mm.h> |
5a0e3ad6 | 28 | #include <linux/slab.h> |
53af545b | 29 | #include <linux/list.h> |
c88c4e4c | 30 | #include <linux/module.h> |
8b5d6d3b | 31 | #include <linux/completion.h> |
41571916 | 32 | #include <linux/delay.h> |
46a97191 | 33 | #include <linux/hyperv.h> |
e810e48c | 34 | #include <asm/mshyperv.h> |
3f335ea2 | 35 | |
0f2a6619 | 36 | #include "hyperv_vmbus.h" |
3e7ee490 | 37 | |
7047f17d S |
38 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type); |
39 | ||
40 | static const struct vmbus_device vmbus_devs[] = { | |
41 | /* IDE */ | |
42 | { .dev_type = HV_IDE, | |
43 | HV_IDE_GUID, | |
44 | .perf_device = true, | |
45 | }, | |
46 | ||
47 | /* SCSI */ | |
48 | { .dev_type = HV_SCSI, | |
49 | HV_SCSI_GUID, | |
50 | .perf_device = true, | |
51 | }, | |
52 | ||
53 | /* Fibre Channel */ | |
54 | { .dev_type = HV_FC, | |
55 | HV_SYNTHFC_GUID, | |
56 | .perf_device = true, | |
57 | }, | |
58 | ||
59 | /* Synthetic NIC */ | |
60 | { .dev_type = HV_NIC, | |
61 | HV_NIC_GUID, | |
62 | .perf_device = true, | |
63 | }, | |
64 | ||
65 | /* Network Direct */ | |
66 | { .dev_type = HV_ND, | |
67 | HV_ND_GUID, | |
68 | .perf_device = true, | |
69 | }, | |
70 | ||
71 | /* PCIE */ | |
72 | { .dev_type = HV_PCIE, | |
73 | HV_PCIE_GUID, | |
238064f1 | 74 | .perf_device = false, |
7047f17d S |
75 | }, |
76 | ||
77 | /* Synthetic Frame Buffer */ | |
78 | { .dev_type = HV_FB, | |
79 | HV_SYNTHVID_GUID, | |
80 | .perf_device = false, | |
81 | }, | |
82 | ||
83 | /* Synthetic Keyboard */ | |
84 | { .dev_type = HV_KBD, | |
85 | HV_KBD_GUID, | |
86 | .perf_device = false, | |
87 | }, | |
88 | ||
89 | /* Synthetic MOUSE */ | |
90 | { .dev_type = HV_MOUSE, | |
91 | HV_MOUSE_GUID, | |
92 | .perf_device = false, | |
93 | }, | |
94 | ||
95 | /* KVP */ | |
96 | { .dev_type = HV_KVP, | |
97 | HV_KVP_GUID, | |
98 | .perf_device = false, | |
99 | }, | |
100 | ||
101 | /* Time Synch */ | |
102 | { .dev_type = HV_TS, | |
103 | HV_TS_GUID, | |
104 | .perf_device = false, | |
105 | }, | |
106 | ||
107 | /* Heartbeat */ | |
108 | { .dev_type = HV_HB, | |
109 | HV_HEART_BEAT_GUID, | |
110 | .perf_device = false, | |
111 | }, | |
112 | ||
113 | /* Shutdown */ | |
114 | { .dev_type = HV_SHUTDOWN, | |
115 | HV_SHUTDOWN_GUID, | |
116 | .perf_device = false, | |
117 | }, | |
118 | ||
119 | /* File copy */ | |
120 | { .dev_type = HV_FCOPY, | |
121 | HV_FCOPY_GUID, | |
122 | .perf_device = false, | |
123 | }, | |
124 | ||
125 | /* Backup */ | |
126 | { .dev_type = HV_BACKUP, | |
127 | HV_VSS_GUID, | |
128 | .perf_device = false, | |
129 | }, | |
130 | ||
131 | /* Dynamic Memory */ | |
132 | { .dev_type = HV_DM, | |
133 | HV_DM_GUID, | |
134 | .perf_device = false, | |
135 | }, | |
136 | ||
137 | /* Unknown GUID */ | |
f45be72c | 138 | { .dev_type = HV_UNKNOWN, |
7047f17d S |
139 | .perf_device = false, |
140 | }, | |
141 | }; | |
142 | ||
0f98829a DC |
143 | static const struct { |
144 | uuid_le guid; | |
145 | } vmbus_unsupported_devs[] = { | |
146 | { HV_AVMA1_GUID }, | |
147 | { HV_AVMA2_GUID }, | |
148 | { HV_RDV_GUID }, | |
149 | }; | |
150 | ||
ccb61f8a S |
151 | /* |
152 | * The rescinded channel may be blocked waiting for a response from the host; | |
153 | * take care of that. | |
154 | */ | |
155 | static void vmbus_rescind_cleanup(struct vmbus_channel *channel) | |
156 | { | |
157 | struct vmbus_channel_msginfo *msginfo; | |
158 | unsigned long flags; | |
159 | ||
160 | ||
161 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
192b2d78 | 162 | channel->rescind = true; |
ccb61f8a S |
163 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
164 | msglistentry) { | |
165 | ||
166 | if (msginfo->waiting_channel == channel) { | |
167 | complete(&msginfo->waitevent); | |
168 | break; | |
169 | } | |
170 | } | |
171 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
172 | } | |
173 | ||
0f98829a DC |
174 | static bool is_unsupported_vmbus_devs(const uuid_le *guid) |
175 | { | |
176 | int i; | |
177 | ||
178 | for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++) | |
179 | if (!uuid_le_cmp(*guid, vmbus_unsupported_devs[i].guid)) | |
180 | return true; | |
181 | return false; | |
182 | } | |
183 | ||
184 | static u16 hv_get_dev_type(const struct vmbus_channel *channel) | |
7047f17d | 185 | { |
0f98829a | 186 | const uuid_le *guid = &channel->offermsg.offer.if_type; |
7047f17d S |
187 | u16 i; |
188 | ||
0f98829a | 189 | if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid)) |
f45be72c | 190 | return HV_UNKNOWN; |
0f98829a | 191 | |
f45be72c | 192 | for (i = HV_IDE; i < HV_UNKNOWN; i++) { |
7047f17d S |
193 | if (!uuid_le_cmp(*guid, vmbus_devs[i].guid)) |
194 | return i; | |
195 | } | |
196 | pr_info("Unknown GUID: %pUl\n", guid); | |
197 | return i; | |
198 | } | |
f38e7dd7 | 199 | |
c88c4e4c | 200 | /** |
da0e9631 | 201 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
202 | * @icmsghdrp: Pointer to msg header structure |
203 | * @icmsg_negotiate: Pointer to negotiate message structure | |
204 | * @buf: Raw buffer channel data | |
205 | * | |
206 | * @icmsghdrp is of type &struct icmsg_hdr. | |
c836d0ab S |
207 | * Set up and fill in default negotiate response message. |
208 | * | |
a1656454 AN |
209 | * The fw_version and fw_vercnt specifies the framework version that |
210 | * we can support. | |
211 | * | |
212 | * The srv_version and srv_vercnt specifies the service | |
213 | * versions we can support. | |
214 | * | |
215 | * Versions are given in decreasing order. | |
216 | * | |
217 | * nego_fw_version and nego_srv_version store the selected protocol versions. | |
c88c4e4c HJ |
218 | * |
219 | * Mainly used by Hyper-V drivers. | |
220 | */ | |
6741335b | 221 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
a1656454 AN |
222 | u8 *buf, const int *fw_version, int fw_vercnt, |
223 | const int *srv_version, int srv_vercnt, | |
224 | int *nego_fw_version, int *nego_srv_version) | |
c88c4e4c | 225 | { |
6741335b S |
226 | int icframe_major, icframe_minor; |
227 | int icmsg_major, icmsg_minor; | |
228 | int fw_major, fw_minor; | |
229 | int srv_major, srv_minor; | |
a1656454 | 230 | int i, j; |
6741335b | 231 | bool found_match = false; |
a1656454 | 232 | struct icmsg_negotiate *negop; |
c836d0ab | 233 | |
a3605300 | 234 | icmsghdrp->icmsgsize = 0x10; |
a3605300 S |
235 | negop = (struct icmsg_negotiate *)&buf[ |
236 | sizeof(struct vmbuspipe_hdr) + | |
237 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 238 | |
6741335b S |
239 | icframe_major = negop->icframe_vercnt; |
240 | icframe_minor = 0; | |
241 | ||
242 | icmsg_major = negop->icmsg_vercnt; | |
243 | icmsg_minor = 0; | |
c836d0ab S |
244 | |
245 | /* | |
246 | * Select the framework version number we will | |
247 | * support. | |
248 | */ | |
249 | ||
a1656454 AN |
250 | for (i = 0; i < fw_vercnt; i++) { |
251 | fw_major = (fw_version[i] >> 16); | |
252 | fw_minor = (fw_version[i] & 0xFFFF); | |
253 | ||
254 | for (j = 0; j < negop->icframe_vercnt; j++) { | |
255 | if ((negop->icversion_data[j].major == fw_major) && | |
256 | (negop->icversion_data[j].minor == fw_minor)) { | |
257 | icframe_major = negop->icversion_data[j].major; | |
258 | icframe_minor = negop->icversion_data[j].minor; | |
259 | found_match = true; | |
260 | break; | |
261 | } | |
6741335b | 262 | } |
a1656454 AN |
263 | |
264 | if (found_match) | |
265 | break; | |
c836d0ab S |
266 | } |
267 | ||
6741335b S |
268 | if (!found_match) |
269 | goto fw_error; | |
270 | ||
271 | found_match = false; | |
272 | ||
a1656454 AN |
273 | for (i = 0; i < srv_vercnt; i++) { |
274 | srv_major = (srv_version[i] >> 16); | |
275 | srv_minor = (srv_version[i] & 0xFFFF); | |
276 | ||
277 | for (j = negop->icframe_vercnt; | |
278 | (j < negop->icframe_vercnt + negop->icmsg_vercnt); | |
279 | j++) { | |
280 | ||
281 | if ((negop->icversion_data[j].major == srv_major) && | |
282 | (negop->icversion_data[j].minor == srv_minor)) { | |
283 | ||
284 | icmsg_major = negop->icversion_data[j].major; | |
285 | icmsg_minor = negop->icversion_data[j].minor; | |
286 | found_match = true; | |
287 | break; | |
288 | } | |
6741335b | 289 | } |
a1656454 AN |
290 | |
291 | if (found_match) | |
292 | break; | |
c88c4e4c | 293 | } |
a3605300 | 294 | |
c836d0ab | 295 | /* |
6741335b | 296 | * Respond with the framework and service |
c836d0ab S |
297 | * version numbers we can support. |
298 | */ | |
6741335b S |
299 | |
300 | fw_error: | |
301 | if (!found_match) { | |
302 | negop->icframe_vercnt = 0; | |
303 | negop->icmsg_vercnt = 0; | |
304 | } else { | |
305 | negop->icframe_vercnt = 1; | |
306 | negop->icmsg_vercnt = 1; | |
307 | } | |
308 | ||
a1656454 AN |
309 | if (nego_fw_version) |
310 | *nego_fw_version = (icframe_major << 16) | icframe_minor; | |
311 | ||
312 | if (nego_srv_version) | |
313 | *nego_srv_version = (icmsg_major << 16) | icmsg_minor; | |
314 | ||
6741335b S |
315 | negop->icversion_data[0].major = icframe_major; |
316 | negop->icversion_data[0].minor = icframe_minor; | |
317 | negop->icversion_data[1].major = icmsg_major; | |
318 | negop->icversion_data[1].minor = icmsg_minor; | |
319 | return found_match; | |
c88c4e4c | 320 | } |
a3605300 | 321 | |
da0e9631 | 322 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 323 | |
3e189519 | 324 | /* |
e98cb276 | 325 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 326 | */ |
50fe56d2 | 327 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 328 | { |
aded7165 | 329 | struct vmbus_channel *channel; |
3e7ee490 | 330 | |
aded7165 | 331 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 332 | if (!channel) |
3e7ee490 | 333 | return NULL; |
3e7ee490 | 334 | |
67fae053 | 335 | spin_lock_init(&channel->lock); |
7fa32e5e | 336 | init_completion(&channel->rescind_event); |
e68d2971 S |
337 | |
338 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 339 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 340 | |
631e63a9 SH |
341 | tasklet_init(&channel->callback_event, |
342 | vmbus_on_event, (unsigned long)channel); | |
343 | ||
3e7ee490 HJ |
344 | return channel; |
345 | } | |
346 | ||
3e189519 | 347 | /* |
e98cb276 | 348 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 349 | */ |
9f3e28e3 | 350 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 351 | { |
631e63a9 | 352 | tasklet_kill(&channel->callback_event); |
8200f208 | 353 | |
c2e5df61 | 354 | kobject_put(&channel->kobj); |
3e7ee490 HJ |
355 | } |
356 | ||
3a28fa35 S |
357 | static void percpu_channel_enq(void *arg) |
358 | { | |
359 | struct vmbus_channel *channel = arg; | |
37cdd991 SH |
360 | struct hv_per_cpu_context *hv_cpu |
361 | = this_cpu_ptr(hv_context.cpu_context); | |
3a28fa35 | 362 | |
8200f208 | 363 | list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list); |
3a28fa35 | 364 | } |
8b5d6d3b | 365 | |
3a28fa35 S |
366 | static void percpu_channel_deq(void *arg) |
367 | { | |
368 | struct vmbus_channel *channel = arg; | |
369 | ||
8200f208 | 370 | list_del_rcu(&channel->percpu_list); |
3a28fa35 | 371 | } |
8b5d6d3b | 372 | |
ed6cfcc5 | 373 | |
f52078cf | 374 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 375 | { |
ed6cfcc5 | 376 | struct vmbus_channel_relid_released msg; |
259cc665 | 377 | int ret; |
4b2f9abe | 378 | |
c8705979 | 379 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 380 | msg.child_relid = relid; |
c8705979 | 381 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
259cc665 VK |
382 | ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released), |
383 | true); | |
384 | ||
385 | trace_vmbus_release_relid(&msg, ret); | |
f52078cf | 386 | } |
c8705979 | 387 | |
192b2d78 | 388 | void hv_process_channel_removal(u32 relid) |
f52078cf DC |
389 | { |
390 | unsigned long flags; | |
192b2d78 | 391 | struct vmbus_channel *primary_channel, *channel; |
f52078cf | 392 | |
85d9aa70 | 393 | BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); |
34c6801e | 394 | |
192b2d78 S |
395 | /* |
396 | * Make sure channel is valid as we may have raced. | |
397 | */ | |
398 | channel = relid2channel(relid); | |
399 | if (!channel) | |
400 | return; | |
401 | ||
402 | BUG_ON(!channel->rescind); | |
2115b561 S |
403 | if (channel->target_cpu != get_cpu()) { |
404 | put_cpu(); | |
3a28fa35 S |
405 | smp_call_function_single(channel->target_cpu, |
406 | percpu_channel_deq, channel, true); | |
2115b561 | 407 | } else { |
3a28fa35 | 408 | percpu_channel_deq(channel); |
2115b561 S |
409 | put_cpu(); |
410 | } | |
3a28fa35 | 411 | |
e68d2971 | 412 | if (channel->primary_channel == NULL) { |
e68d2971 | 413 | list_del(&channel->listentry); |
ca1c4b74 DC |
414 | |
415 | primary_channel = channel; | |
e68d2971 S |
416 | } else { |
417 | primary_channel = channel->primary_channel; | |
67fae053 | 418 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 419 | list_del(&channel->sc_list); |
357e836a | 420 | primary_channel->num_sc--; |
67fae053 | 421 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 422 | } |
ca1c4b74 DC |
423 | |
424 | /* | |
425 | * We need to free the bit for init_vp_index() to work in the case | |
426 | * of sub-channel, when we reload drivers like hv_netvsc. | |
427 | */ | |
509879bd S |
428 | if (channel->affinity_policy == HV_LOCALIZED) |
429 | cpumask_clear_cpu(channel->target_cpu, | |
430 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 431 | |
638fea33 DC |
432 | vmbus_release_relid(relid); |
433 | ||
c8705979 | 434 | free_channel(channel); |
4b2f9abe | 435 | } |
8b5d6d3b | 436 | |
93e5bd06 S |
437 | void vmbus_free_channels(void) |
438 | { | |
813c5b79 DC |
439 | struct vmbus_channel *channel, *tmp; |
440 | ||
441 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
442 | listentry) { | |
34c6801e | 443 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 444 | channel->rescind = true; |
93e5bd06 | 445 | |
93e5bd06 | 446 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
447 | } |
448 | } | |
449 | ||
3e189519 | 450 | /* |
e98cb276 | 451 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 452 | * associated with this offer |
bd60c33e | 453 | */ |
2dd37cb8 | 454 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 455 | { |
aded7165 | 456 | struct vmbus_channel *channel; |
188963ec | 457 | bool fnew = true; |
0f5e44ca | 458 | unsigned long flags; |
7047f17d | 459 | u16 dev_type; |
85d9aa70 | 460 | int ret; |
3e7ee490 | 461 | |
454f18a9 | 462 | /* Make sure this is a new offer */ |
d6f591e3 | 463 | mutex_lock(&vmbus_connection.channel_mutex); |
3e7ee490 | 464 | |
6f3d791f S |
465 | /* |
466 | * Now that we have acquired the channel_mutex, | |
467 | * we can release the potentially racing rescind thread. | |
468 | */ | |
469 | atomic_dec(&vmbus_connection.offer_in_progress); | |
470 | ||
da9fcb72 | 471 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
472 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
473 | newchannel->offermsg.offer.if_type) && | |
474 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
475 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 476 | fnew = false; |
3e7ee490 HJ |
477 | break; |
478 | } | |
479 | } | |
480 | ||
8dfd3326 | 481 | if (fnew) |
c50f7fb2 | 482 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 483 | &vmbus_connection.chn_list); |
bd60c33e | 484 | |
d6f591e3 | 485 | mutex_unlock(&vmbus_connection.channel_mutex); |
3e7ee490 | 486 | |
188963ec | 487 | if (!fnew) { |
e68d2971 S |
488 | /* |
489 | * Check to see if this is a sub-channel. | |
490 | */ | |
491 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
492 | /* | |
493 | * Process the sub-channel. | |
494 | */ | |
495 | newchannel->primary_channel = channel; | |
67fae053 | 496 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 497 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 498 | channel->num_sc++; |
357e836a | 499 | spin_unlock_irqrestore(&channel->lock, flags); |
54a66265 | 500 | } else { |
8dfd3326 | 501 | goto err_free_chan; |
54a66265 | 502 | } |
8dfd3326 | 503 | } |
e68d2971 | 504 | |
0f98829a | 505 | dev_type = hv_get_dev_type(newchannel); |
7047f17d S |
506 | |
507 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 508 | |
8dfd3326 VK |
509 | if (newchannel->target_cpu != get_cpu()) { |
510 | put_cpu(); | |
511 | smp_call_function_single(newchannel->target_cpu, | |
512 | percpu_channel_enq, | |
513 | newchannel, true); | |
514 | } else { | |
515 | percpu_channel_enq(newchannel); | |
516 | put_cpu(); | |
3e7ee490 HJ |
517 | } |
518 | ||
42dceebe S |
519 | /* |
520 | * This state is used to indicate a successful open | |
521 | * so that when we do close the channel normally, we | |
522 | * can cleanup properly | |
523 | */ | |
524 | newchannel->state = CHANNEL_OPEN_STATE; | |
525 | ||
8dfd3326 | 526 | if (!fnew) { |
c2e5df61 SH |
527 | struct hv_device *dev |
528 | = newchannel->primary_channel->device_obj; | |
529 | ||
530 | if (vmbus_add_channel_kobj(dev, newchannel)) { | |
531 | atomic_dec(&vmbus_connection.offer_in_progress); | |
532 | goto err_free_chan; | |
533 | } | |
534 | ||
8dfd3326 VK |
535 | if (channel->sc_creation_callback != NULL) |
536 | channel->sc_creation_callback(newchannel); | |
192b2d78 | 537 | newchannel->probe_done = true; |
8dfd3326 VK |
538 | return; |
539 | } | |
540 | ||
bd60c33e GKH |
541 | /* |
542 | * Start the process of binding this offer to the driver | |
543 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 544 | * vmbus_child_dev_add() |
bd60c33e | 545 | */ |
f2c73011 | 546 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
547 | &newchannel->offermsg.offer.if_type, |
548 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 549 | newchannel); |
9c3a6f7e | 550 | if (!newchannel->device_obj) |
5b1e5b53 | 551 | goto err_deq_chan; |
3e7ee490 | 552 | |
7047f17d | 553 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
554 | /* |
555 | * Add the new device to the bus. This will kick off device-driver | |
556 | * binding which eventually invokes the device driver's AddDevice() | |
557 | * method. | |
558 | */ | |
85d9aa70 | 559 | ret = vmbus_device_register(newchannel->device_obj); |
85d9aa70 DC |
560 | |
561 | if (ret != 0) { | |
d43e2fe7 DC |
562 | pr_err("unable to add child device object (relid %d)\n", |
563 | newchannel->offermsg.child_relid); | |
564 | kfree(newchannel->device_obj); | |
565 | goto err_deq_chan; | |
566 | } | |
54a66265 | 567 | |
6f3d791f | 568 | newchannel->probe_done = true; |
9c3a6f7e | 569 | return; |
2dd37cb8 | 570 | |
5b1e5b53 | 571 | err_deq_chan: |
d6f591e3 | 572 | mutex_lock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 573 | list_del(&newchannel->listentry); |
d6f591e3 | 574 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
575 | |
576 | if (newchannel->target_cpu != get_cpu()) { | |
577 | put_cpu(); | |
578 | smp_call_function_single(newchannel->target_cpu, | |
579 | percpu_channel_deq, newchannel, true); | |
580 | } else { | |
581 | percpu_channel_deq(newchannel); | |
582 | put_cpu(); | |
583 | } | |
638fea33 DC |
584 | |
585 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 586 | |
9c3a6f7e VK |
587 | err_free_chan: |
588 | free_channel(newchannel); | |
3e7ee490 HJ |
589 | } |
590 | ||
a119845f S |
591 | /* |
592 | * We use this state to statically distribute the channel interrupt load. | |
593 | */ | |
1f656ff3 | 594 | static int next_numa_node_id; |
a119845f S |
595 | |
596 | /* | |
597 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 | 598 | * channel interrupt load by binding a channel to VCPU. |
ce767047 HZ |
599 | * We distribute the interrupt loads to one or more NUMA nodes based on |
600 | * the channel's affinity_policy. | |
1f656ff3 S |
601 | * |
602 | * For pre-win8 hosts or non-performance critical channels we assign the | |
603 | * first CPU in the first NUMA node. | |
a119845f | 604 | */ |
7047f17d | 605 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
606 | { |
607 | u32 cur_cpu; | |
7047f17d | 608 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
609 | struct vmbus_channel *primary = channel->primary_channel; |
610 | int next_node; | |
611 | struct cpumask available_mask; | |
9f01ec53 | 612 | struct cpumask *alloced_mask; |
a119845f | 613 | |
a119845f S |
614 | if ((vmbus_proto_version == VERSION_WS2008) || |
615 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
616 | /* | |
617 | * Prior to win8, all channel interrupts are | |
618 | * delivered on cpu 0. | |
619 | * Also if the channel is not a performance critical | |
620 | * channel, bind it to cpu 0. | |
621 | */ | |
1f656ff3 | 622 | channel->numa_node = 0; |
d3ba720d | 623 | channel->target_cpu = 0; |
7415aea6 | 624 | channel->target_vp = hv_cpu_number_to_vp_number(0); |
d3ba720d | 625 | return; |
a119845f | 626 | } |
ce59fec8 VK |
627 | |
628 | /* | |
509879bd S |
629 | * Based on the channel affinity policy, we will assign the NUMA |
630 | * nodes. | |
ce59fec8 | 631 | */ |
509879bd S |
632 | |
633 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
634 | while (true) { |
635 | next_node = next_numa_node_id++; | |
509879bd | 636 | if (next_node == nr_node_ids) { |
1f656ff3 | 637 | next_node = next_numa_node_id = 0; |
509879bd S |
638 | continue; |
639 | } | |
1f656ff3 S |
640 | if (cpumask_empty(cpumask_of_node(next_node))) |
641 | continue; | |
642 | break; | |
643 | } | |
644 | channel->numa_node = next_node; | |
645 | primary = channel; | |
646 | } | |
9f01ec53 | 647 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 648 | |
9f01ec53 | 649 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 650 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 651 | /* |
1f656ff3 S |
652 | * We have cycled through all the CPUs in the node; |
653 | * reset the alloced map. | |
ce59fec8 | 654 | */ |
9f01ec53 | 655 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
656 | } |
657 | ||
9f01ec53 | 658 | cpumask_xor(&available_mask, alloced_mask, |
1f656ff3 S |
659 | cpumask_of_node(primary->numa_node)); |
660 | ||
3b71107d | 661 | cur_cpu = -1; |
79fd8e70 | 662 | |
509879bd S |
663 | if (primary->affinity_policy == HV_LOCALIZED) { |
664 | /* | |
665 | * Normally Hyper-V host doesn't create more subchannels | |
666 | * than there are VCPUs on the node but it is possible when not | |
667 | * all present VCPUs on the node are initialized by guest. | |
668 | * Clear the alloced_cpus_in_node to start over. | |
669 | */ | |
670 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
671 | cpumask_of_node(primary->numa_node))) | |
672 | cpumask_clear(&primary->alloced_cpus_in_node); | |
673 | } | |
79fd8e70 | 674 | |
3b71107d DC |
675 | while (true) { |
676 | cur_cpu = cpumask_next(cur_cpu, &available_mask); | |
677 | if (cur_cpu >= nr_cpu_ids) { | |
678 | cur_cpu = -1; | |
679 | cpumask_copy(&available_mask, | |
680 | cpumask_of_node(primary->numa_node)); | |
681 | continue; | |
682 | } | |
683 | ||
509879bd S |
684 | if (primary->affinity_policy == HV_LOCALIZED) { |
685 | /* | |
686 | * NOTE: in the case of sub-channel, we clear the | |
687 | * sub-channel related bit(s) in | |
688 | * primary->alloced_cpus_in_node in | |
689 | * hv_process_channel_removal(), so when we | |
690 | * reload drivers like hv_netvsc in SMP guest, here | |
691 | * we're able to re-allocate | |
692 | * bit from primary->alloced_cpus_in_node. | |
693 | */ | |
694 | if (!cpumask_test_cpu(cur_cpu, | |
695 | &primary->alloced_cpus_in_node)) { | |
696 | cpumask_set_cpu(cur_cpu, | |
697 | &primary->alloced_cpus_in_node); | |
698 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
699 | break; | |
700 | } | |
701 | } else { | |
3b71107d DC |
702 | cpumask_set_cpu(cur_cpu, alloced_mask); |
703 | break; | |
704 | } | |
705 | } | |
1f656ff3 | 706 | |
d3ba720d | 707 | channel->target_cpu = cur_cpu; |
7415aea6 | 708 | channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); |
a119845f S |
709 | } |
710 | ||
41571916 VK |
711 | static void vmbus_wait_for_unload(void) |
712 | { | |
cd95aad5 VK |
713 | int cpu; |
714 | void *page_addr; | |
715 | struct hv_message *msg; | |
41571916 | 716 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 717 | u32 message_type; |
41571916 | 718 | |
cd95aad5 VK |
719 | /* |
720 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
721 | * used for initial contact or to CPU0 depending on host version. When | |
722 | * we're crashing on a different CPU let's hope that IRQ handler on | |
723 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
724 | * functional and vmbus_unload_response() will complete | |
725 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
726 | * read message pages for all CPUs directly. | |
727 | */ | |
41571916 | 728 | while (1) { |
cd95aad5 VK |
729 | if (completion_done(&vmbus_connection.unload_event)) |
730 | break; | |
41571916 | 731 | |
cd95aad5 | 732 | for_each_online_cpu(cpu) { |
37cdd991 SH |
733 | struct hv_per_cpu_context *hv_cpu |
734 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
735 | ||
736 | page_addr = hv_cpu->synic_message_page; | |
737 | msg = (struct hv_message *)page_addr | |
738 | + VMBUS_MESSAGE_SINT; | |
41571916 | 739 | |
cd95aad5 VK |
740 | message_type = READ_ONCE(msg->header.message_type); |
741 | if (message_type == HVMSG_NONE) | |
742 | continue; | |
41571916 | 743 | |
cd95aad5 VK |
744 | hdr = (struct vmbus_channel_message_header *) |
745 | msg->u.payload; | |
746 | ||
747 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
748 | complete(&vmbus_connection.unload_event); | |
749 | ||
750 | vmbus_signal_eom(msg, message_type); | |
751 | } | |
752 | ||
753 | mdelay(10); | |
754 | } | |
755 | ||
756 | /* | |
757 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
758 | * maybe-pending messages on all CPUs to be able to receive new | |
759 | * messages after we reconnect. | |
760 | */ | |
761 | for_each_online_cpu(cpu) { | |
37cdd991 SH |
762 | struct hv_per_cpu_context *hv_cpu |
763 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
764 | ||
765 | page_addr = hv_cpu->synic_message_page; | |
cd95aad5 VK |
766 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
767 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
768 | } |
769 | } | |
770 | ||
2db84eff S |
771 | /* |
772 | * vmbus_unload_response - Handler for the unload response. | |
773 | */ | |
774 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
775 | { | |
776 | /* | |
777 | * This is a global event; just wakeup the waiting thread. | |
778 | * Once we successfully unload, we can cleanup the monitor state. | |
779 | */ | |
780 | complete(&vmbus_connection.unload_event); | |
781 | } | |
782 | ||
75ff3a8a | 783 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
784 | { |
785 | struct vmbus_channel_message_header hdr; | |
786 | ||
4a54243f VK |
787 | /* Pre-Win2012R2 hosts don't support reconnect */ |
788 | if (vmbus_proto_version < VERSION_WIN8_1) | |
789 | return; | |
790 | ||
2db84eff S |
791 | init_completion(&vmbus_connection.unload_event); |
792 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
793 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
c0bb0392 VK |
794 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), |
795 | !crash); | |
2db84eff | 796 | |
41571916 VK |
797 | /* |
798 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
799 | * happening in an interrupt context, where scheduling is impossible. | |
800 | */ | |
75ff3a8a | 801 | if (!crash) |
41571916 VK |
802 | wait_for_completion(&vmbus_connection.unload_event); |
803 | else | |
804 | vmbus_wait_for_unload(); | |
2db84eff S |
805 | } |
806 | ||
3e189519 | 807 | /* |
e98cb276 | 808 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 809 | * |
bd60c33e | 810 | */ |
e98cb276 | 811 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 812 | { |
bd60c33e | 813 | struct vmbus_channel_offer_channel *offer; |
188963ec | 814 | struct vmbus_channel *newchannel; |
3e7ee490 | 815 | |
bd60c33e | 816 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 817 | |
03b81e66 VK |
818 | trace_vmbus_onoffer(offer); |
819 | ||
454f18a9 | 820 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 821 | newchannel = alloc_channel(); |
188963ec | 822 | if (!newchannel) { |
9a547602 | 823 | vmbus_release_relid(offer->child_relid); |
54a66265 | 824 | atomic_dec(&vmbus_connection.offer_in_progress); |
0a46618d | 825 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
826 | return; |
827 | } | |
828 | ||
b3bf60c7 S |
829 | /* |
830 | * Setup state for signalling the host. | |
831 | */ | |
05784171 | 832 | newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID; |
b3bf60c7 S |
833 | |
834 | if (vmbus_proto_version != VERSION_WS2008) { | |
835 | newchannel->is_dedicated_interrupt = | |
836 | (offer->is_dedicated_interrupt != 0); | |
05784171 | 837 | newchannel->sig_event = offer->connection_id; |
b3bf60c7 S |
838 | } |
839 | ||
c50f7fb2 | 840 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 841 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
842 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
843 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 844 | |
2dd37cb8 | 845 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
846 | } |
847 | ||
3e189519 | 848 | /* |
e98cb276 | 849 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
850 | * |
851 | * We queue a work item to process this offer synchronously | |
852 | */ | |
e98cb276 | 853 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 854 | { |
bd60c33e | 855 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 856 | struct vmbus_channel *channel; |
d43e2fe7 | 857 | struct device *dev; |
3e7ee490 | 858 | |
bd60c33e | 859 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 | 860 | |
5175167c VK |
861 | trace_vmbus_onoffer_rescind(rescind); |
862 | ||
54a66265 S |
863 | /* |
864 | * The offer msg and the corresponding rescind msg | |
865 | * from the host are guranteed to be ordered - | |
866 | * offer comes in first and then the rescind. | |
867 | * Since we process these events in work elements, | |
868 | * and with preemption, we may end up processing | |
869 | * the events out of order. Given that we handle these | |
870 | * work elements on the same CPU, this is possible only | |
871 | * in the case of preemption. In any case wait here | |
872 | * until the offer processing has moved beyond the | |
873 | * point where the channel is discoverable. | |
874 | */ | |
875 | ||
876 | while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { | |
877 | /* | |
878 | * We wait here until any channel offer is currently | |
879 | * being processed. | |
880 | */ | |
881 | msleep(1); | |
882 | } | |
883 | ||
85d9aa70 | 884 | mutex_lock(&vmbus_connection.channel_mutex); |
d43e2fe7 | 885 | channel = relid2channel(rescind->child_relid); |
54a66265 | 886 | mutex_unlock(&vmbus_connection.channel_mutex); |
98e08702 | 887 | |
2dd37cb8 | 888 | if (channel == NULL) { |
f52078cf | 889 | /* |
54a66265 S |
890 | * We failed in processing the offer message; |
891 | * we would have cleaned up the relid in that | |
892 | * failure path. | |
f52078cf | 893 | */ |
54a66265 | 894 | return; |
2dd37cb8 | 895 | } |
3e7ee490 | 896 | |
6f3d791f S |
897 | /* |
898 | * Now wait for offer handling to complete. | |
899 | */ | |
7fa32e5e | 900 | vmbus_rescind_cleanup(channel); |
6f3d791f S |
901 | while (READ_ONCE(channel->probe_done) == false) { |
902 | /* | |
903 | * We wait here until any channel offer is currently | |
904 | * being processed. | |
905 | */ | |
906 | msleep(1); | |
907 | } | |
908 | ||
909 | /* | |
910 | * At this point, the rescind handling can proceed safely. | |
911 | */ | |
912 | ||
d43e2fe7 | 913 | if (channel->device_obj) { |
499e8401 DC |
914 | if (channel->chn_rescind_callback) { |
915 | channel->chn_rescind_callback(channel); | |
54a66265 | 916 | return; |
499e8401 | 917 | } |
d43e2fe7 DC |
918 | /* |
919 | * We will have to unregister this device from the | |
920 | * driver core. | |
921 | */ | |
922 | dev = get_device(&channel->device_obj->device); | |
923 | if (dev) { | |
924 | vmbus_device_unregister(channel->device_obj); | |
925 | put_device(dev); | |
926 | } | |
2dd37cb8 | 927 | } |
54a66265 S |
928 | if (channel->primary_channel != NULL) { |
929 | /* | |
930 | * Sub-channel is being rescinded. Following is the channel | |
931 | * close sequence when initiated from the driveri (refer to | |
932 | * vmbus_close() for details): | |
933 | * 1. Close all sub-channels first | |
934 | * 2. Then close the primary channel. | |
935 | */ | |
192b2d78 | 936 | mutex_lock(&vmbus_connection.channel_mutex); |
54a66265 S |
937 | if (channel->state == CHANNEL_OPEN_STATE) { |
938 | /* | |
939 | * The channel is currently not open; | |
940 | * it is safe for us to cleanup the channel. | |
941 | */ | |
192b2d78 | 942 | hv_process_channel_removal(rescind->child_relid); |
7fa32e5e S |
943 | } else { |
944 | complete(&channel->rescind_event); | |
54a66265 | 945 | } |
192b2d78 | 946 | mutex_unlock(&vmbus_connection.channel_mutex); |
54a66265 | 947 | } |
85d9aa70 DC |
948 | } |
949 | ||
950 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
951 | { | |
85d9aa70 DC |
952 | BUG_ON(!is_hvsock_channel(channel)); |
953 | ||
9d35593b DC |
954 | /* We always get a rescind msg when a connection is closed. */ |
955 | while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind)) | |
956 | msleep(1); | |
957 | ||
85d9aa70 | 958 | vmbus_device_unregister(channel->device_obj); |
3e7ee490 | 959 | } |
85d9aa70 DC |
960 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
961 | ||
3e7ee490 | 962 | |
3e189519 | 963 | /* |
e98cb276 HZ |
964 | * vmbus_onoffers_delivered - |
965 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
966 | * |
967 | * Nothing to do here. | |
968 | */ | |
e98cb276 | 969 | static void vmbus_onoffers_delivered( |
bd60c33e | 970 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 971 | { |
3e7ee490 HJ |
972 | } |
973 | ||
3e189519 | 974 | /* |
e98cb276 | 975 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
976 | * |
977 | * This is invoked when we received a response to our channel open request. | |
978 | * Find the matching request, copy the response and signal the requesting | |
979 | * thread. | |
980 | */ | |
e98cb276 | 981 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 982 | { |
bd60c33e | 983 | struct vmbus_channel_open_result *result; |
188963ec HZ |
984 | struct vmbus_channel_msginfo *msginfo; |
985 | struct vmbus_channel_message_header *requestheader; | |
986 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 987 | unsigned long flags; |
3e7ee490 | 988 | |
bd60c33e | 989 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 990 | |
9f23ce1a VK |
991 | trace_vmbus_onopen_result(result); |
992 | ||
bd60c33e GKH |
993 | /* |
994 | * Find the open msg, copy the result and signal/unblock the wait event | |
995 | */ | |
15b2f647 | 996 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 997 | |
ebb61e5f HJ |
998 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
999 | msglistentry) { | |
188963ec | 1000 | requestheader = |
c50f7fb2 | 1001 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1002 | |
c50f7fb2 | 1003 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 1004 | openmsg = |
c50f7fb2 HZ |
1005 | (struct vmbus_channel_open_channel *)msginfo->msg; |
1006 | if (openmsg->child_relid == result->child_relid && | |
1007 | openmsg->openid == result->openid) { | |
1008 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 1009 | result, |
9568a193 S |
1010 | sizeof( |
1011 | struct vmbus_channel_open_result)); | |
1012 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1013 | break; |
1014 | } | |
1015 | } | |
1016 | } | |
15b2f647 | 1017 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1018 | } |
1019 | ||
3e189519 | 1020 | /* |
e98cb276 | 1021 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
1022 | * |
1023 | * This is invoked when we received a response to our gpadl create request. | |
1024 | * Find the matching request, copy the response and signal the requesting | |
1025 | * thread. | |
1026 | */ | |
e98cb276 | 1027 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1028 | { |
188963ec | 1029 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
1030 | struct vmbus_channel_msginfo *msginfo; |
1031 | struct vmbus_channel_message_header *requestheader; | |
1032 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 1033 | unsigned long flags; |
3e7ee490 | 1034 | |
188963ec | 1035 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 1036 | |
a13bf0ea VK |
1037 | trace_vmbus_ongpadl_created(gpadlcreated); |
1038 | ||
bd60c33e GKH |
1039 | /* |
1040 | * Find the establish msg, copy the result and signal/unblock the wait | |
1041 | * event | |
1042 | */ | |
15b2f647 | 1043 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1044 | |
ebb61e5f HJ |
1045 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1046 | msglistentry) { | |
188963ec | 1047 | requestheader = |
c50f7fb2 | 1048 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1049 | |
c50f7fb2 | 1050 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
1051 | gpadlheader = |
1052 | (struct vmbus_channel_gpadl_header *)requestheader; | |
1053 | ||
c50f7fb2 HZ |
1054 | if ((gpadlcreated->child_relid == |
1055 | gpadlheader->child_relid) && | |
1056 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
1057 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 1058 | gpadlcreated, |
9568a193 S |
1059 | sizeof( |
1060 | struct vmbus_channel_gpadl_created)); | |
1061 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1062 | break; |
1063 | } | |
1064 | } | |
1065 | } | |
15b2f647 | 1066 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1067 | } |
1068 | ||
3e189519 | 1069 | /* |
e98cb276 | 1070 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
1071 | * |
1072 | * This is invoked when we received a response to our gpadl teardown request. | |
1073 | * Find the matching request, copy the response and signal the requesting | |
1074 | * thread. | |
1075 | */ | |
e98cb276 | 1076 | static void vmbus_ongpadl_torndown( |
bd60c33e | 1077 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1078 | { |
188963ec | 1079 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
1080 | struct vmbus_channel_msginfo *msginfo; |
1081 | struct vmbus_channel_message_header *requestheader; | |
1082 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 1083 | unsigned long flags; |
3e7ee490 | 1084 | |
188963ec | 1085 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e | 1086 | |
602a8c52 VK |
1087 | trace_vmbus_ongpadl_torndown(gpadl_torndown); |
1088 | ||
bd60c33e GKH |
1089 | /* |
1090 | * Find the open msg, copy the result and signal/unblock the wait event | |
1091 | */ | |
15b2f647 | 1092 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1093 | |
ebb61e5f HJ |
1094 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1095 | msglistentry) { | |
188963ec | 1096 | requestheader = |
c50f7fb2 | 1097 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1098 | |
c50f7fb2 | 1099 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
1100 | gpadl_teardown = |
1101 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 1102 | |
c50f7fb2 HZ |
1103 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
1104 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 1105 | gpadl_torndown, |
9568a193 S |
1106 | sizeof( |
1107 | struct vmbus_channel_gpadl_torndown)); | |
1108 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1109 | break; |
1110 | } | |
1111 | } | |
1112 | } | |
15b2f647 | 1113 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1114 | } |
1115 | ||
3e189519 | 1116 | /* |
e98cb276 | 1117 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1118 | * |
1119 | * This is invoked when we received a response to our initiate contact request. | |
1120 | * Find the matching request, copy the response and signal the requesting | |
1121 | * thread. | |
1122 | */ | |
e98cb276 | 1123 | static void vmbus_onversion_response( |
bd60c33e | 1124 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1125 | { |
188963ec HZ |
1126 | struct vmbus_channel_msginfo *msginfo; |
1127 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1128 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1129 | unsigned long flags; |
3e7ee490 | 1130 | |
188963ec | 1131 | version_response = (struct vmbus_channel_version_response *)hdr; |
c7924fb0 VK |
1132 | |
1133 | trace_vmbus_onversion_response(version_response); | |
1134 | ||
15b2f647 | 1135 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1136 | |
ebb61e5f HJ |
1137 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1138 | msglistentry) { | |
188963ec | 1139 | requestheader = |
c50f7fb2 | 1140 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1141 | |
c50f7fb2 HZ |
1142 | if (requestheader->msgtype == |
1143 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1144 | memcpy(&msginfo->response.version_response, |
188963ec | 1145 | version_response, |
bd60c33e | 1146 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1147 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1148 | } |
1149 | } | |
15b2f647 | 1150 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1151 | } |
1152 | ||
c8212f04 | 1153 | /* Channel message dispatch table */ |
e6242fa0 SH |
1154 | const struct vmbus_channel_message_table_entry |
1155 | channel_message_table[CHANNELMSG_COUNT] = { | |
1156 | { CHANNELMSG_INVALID, 0, NULL }, | |
1157 | { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, | |
1158 | { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, | |
1159 | { CHANNELMSG_REQUESTOFFERS, 0, NULL }, | |
1160 | { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, | |
1161 | { CHANNELMSG_OPENCHANNEL, 0, NULL }, | |
1162 | { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, | |
1163 | { CHANNELMSG_CLOSECHANNEL, 0, NULL }, | |
1164 | { CHANNELMSG_GPADL_HEADER, 0, NULL }, | |
1165 | { CHANNELMSG_GPADL_BODY, 0, NULL }, | |
1166 | { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, | |
1167 | { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, | |
1168 | { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, | |
1169 | { CHANNELMSG_RELID_RELEASED, 0, NULL }, | |
1170 | { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, | |
1171 | { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, | |
1172 | { CHANNELMSG_UNLOAD, 0, NULL }, | |
1173 | { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, | |
1174 | { CHANNELMSG_18, 0, NULL }, | |
1175 | { CHANNELMSG_19, 0, NULL }, | |
1176 | { CHANNELMSG_20, 0, NULL }, | |
1177 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | |
c8212f04 GKH |
1178 | }; |
1179 | ||
3e189519 | 1180 | /* |
e98cb276 | 1181 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1182 | * |
1183 | * This is invoked in the vmbus worker thread context. | |
1184 | */ | |
e98cb276 | 1185 | void vmbus_onmessage(void *context) |
3e7ee490 | 1186 | { |
188963ec | 1187 | struct hv_message *msg = context; |
82250213 | 1188 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1189 | int size; |
1190 | ||
f6feebe0 HZ |
1191 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1192 | size = msg->header.payload_size; | |
3e7ee490 | 1193 | |
716fa52f VK |
1194 | trace_vmbus_on_message(hdr); |
1195 | ||
c50f7fb2 | 1196 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1197 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1198 | hdr->msgtype, size); |
04f50c4d | 1199 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1200 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1201 | return; |
1202 | } | |
1203 | ||
b7c6b02f S |
1204 | if (channel_message_table[hdr->msgtype].message_handler) |
1205 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1206 | else |
0a46618d | 1207 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1208 | } |
1209 | ||
3e189519 | 1210 | /* |
e98cb276 | 1211 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1212 | */ |
e98cb276 | 1213 | int vmbus_request_offers(void) |
3e7ee490 | 1214 | { |
82250213 | 1215 | struct vmbus_channel_message_header *msg; |
188963ec | 1216 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1217 | int ret; |
3e7ee490 | 1218 | |
188963ec | 1219 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1220 | sizeof(struct vmbus_channel_message_header), |
1221 | GFP_KERNEL); | |
188963ec | 1222 | if (!msginfo) |
75910f23 | 1223 | return -ENOMEM; |
3e7ee490 | 1224 | |
c50f7fb2 | 1225 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1226 | |
c50f7fb2 | 1227 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1228 | |
c0bb0392 VK |
1229 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), |
1230 | true); | |
d6706e63 VK |
1231 | |
1232 | trace_vmbus_request_offers(ret); | |
1233 | ||
bd60c33e | 1234 | if (ret != 0) { |
0a46618d | 1235 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1236 | |
0c3b7b2f S |
1237 | goto cleanup; |
1238 | } | |
3e7ee490 | 1239 | |
0c3b7b2f | 1240 | cleanup: |
dd9b15dc | 1241 | kfree(msginfo); |
3e7ee490 | 1242 | |
3e7ee490 HJ |
1243 | return ret; |
1244 | } | |
1245 | ||
e68d2971 S |
1246 | /* |
1247 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
1248 | * When a primary channel has multiple sub-channels, we try to |
1249 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
1250 | */ |
1251 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
1252 | { | |
1253 | struct list_head *cur, *tmp; | |
87712bf8 | 1254 | int cur_cpu; |
e68d2971 S |
1255 | struct vmbus_channel *cur_channel; |
1256 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
1257 | int next_channel; |
1258 | int i = 1; | |
e68d2971 S |
1259 | |
1260 | if (list_empty(&primary->sc_list)) | |
1261 | return outgoing_channel; | |
1262 | ||
a13e8bbe S |
1263 | next_channel = primary->next_oc++; |
1264 | ||
1265 | if (next_channel > (primary->num_sc)) { | |
1266 | primary->next_oc = 0; | |
1267 | return outgoing_channel; | |
1268 | } | |
1269 | ||
7415aea6 | 1270 | cur_cpu = hv_cpu_number_to_vp_number(smp_processor_id()); |
e68d2971 S |
1271 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
1272 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1273 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
1274 | continue; | |
1275 | ||
1276 | if (cur_channel->target_vp == cur_cpu) | |
1277 | return cur_channel; | |
1278 | ||
a13e8bbe S |
1279 | if (i == next_channel) |
1280 | return cur_channel; | |
e68d2971 | 1281 | |
a13e8bbe | 1282 | i++; |
e68d2971 S |
1283 | } |
1284 | ||
1285 | return outgoing_channel; | |
1286 | } | |
1287 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
1288 | ||
1289 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
1290 | { | |
1291 | struct list_head *cur, *tmp; | |
1292 | struct vmbus_channel *cur_channel; | |
1293 | ||
1294 | if (primary_channel->sc_creation_callback == NULL) | |
1295 | return; | |
1296 | ||
1297 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1298 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1299 | ||
1300 | primary_channel->sc_creation_callback(cur_channel); | |
1301 | } | |
1302 | } | |
1303 | ||
1304 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1305 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1306 | { | |
1307 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1308 | } | |
1309 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1310 | ||
1311 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1312 | { | |
1313 | bool ret; | |
1314 | ||
1315 | ret = !list_empty(&primary->sc_list); | |
1316 | ||
1317 | if (ret) { | |
1318 | /* | |
1319 | * Invoke the callback on sub-channel creation. | |
1320 | * This will present a uniform interface to the | |
1321 | * clients. | |
1322 | */ | |
1323 | invoke_sc_cb(primary); | |
1324 | } | |
1325 | ||
1326 | return ret; | |
1327 | } | |
1328 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1329 | |
1330 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1331 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1332 | { | |
1333 | channel->chn_rescind_callback = chn_rescind_cb; | |
1334 | } | |
1335 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |