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> |
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, | |
74 | .perf_device = true, | |
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); | |
162 | ||
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); |
e68d2971 S |
336 | |
337 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 338 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 339 | |
631e63a9 SH |
340 | tasklet_init(&channel->callback_event, |
341 | vmbus_on_event, (unsigned long)channel); | |
342 | ||
3e7ee490 HJ |
343 | return channel; |
344 | } | |
345 | ||
3e189519 | 346 | /* |
e98cb276 | 347 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 348 | */ |
9f3e28e3 | 349 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 350 | { |
631e63a9 | 351 | tasklet_kill(&channel->callback_event); |
8200f208 SH |
352 | |
353 | kfree_rcu(channel, rcu); | |
3e7ee490 HJ |
354 | } |
355 | ||
3a28fa35 S |
356 | static void percpu_channel_enq(void *arg) |
357 | { | |
358 | struct vmbus_channel *channel = arg; | |
37cdd991 SH |
359 | struct hv_per_cpu_context *hv_cpu |
360 | = this_cpu_ptr(hv_context.cpu_context); | |
3a28fa35 | 361 | |
8200f208 | 362 | list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list); |
3a28fa35 | 363 | } |
8b5d6d3b | 364 | |
3a28fa35 S |
365 | static void percpu_channel_deq(void *arg) |
366 | { | |
367 | struct vmbus_channel *channel = arg; | |
368 | ||
8200f208 | 369 | list_del_rcu(&channel->percpu_list); |
3a28fa35 | 370 | } |
8b5d6d3b | 371 | |
ed6cfcc5 | 372 | |
f52078cf | 373 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 374 | { |
ed6cfcc5 | 375 | struct vmbus_channel_relid_released msg; |
4b2f9abe | 376 | |
c8705979 | 377 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 378 | msg.child_relid = relid; |
c8705979 | 379 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
c0bb0392 VK |
380 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released), |
381 | true); | |
f52078cf | 382 | } |
c8705979 | 383 | |
f52078cf DC |
384 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) |
385 | { | |
386 | unsigned long flags; | |
387 | struct vmbus_channel *primary_channel; | |
388 | ||
34c6801e | 389 | BUG_ON(!channel->rescind); |
85d9aa70 | 390 | BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); |
34c6801e | 391 | |
2115b561 S |
392 | if (channel->target_cpu != get_cpu()) { |
393 | put_cpu(); | |
3a28fa35 S |
394 | smp_call_function_single(channel->target_cpu, |
395 | percpu_channel_deq, channel, true); | |
2115b561 | 396 | } else { |
3a28fa35 | 397 | percpu_channel_deq(channel); |
2115b561 S |
398 | put_cpu(); |
399 | } | |
3a28fa35 | 400 | |
e68d2971 | 401 | if (channel->primary_channel == NULL) { |
e68d2971 | 402 | list_del(&channel->listentry); |
ca1c4b74 DC |
403 | |
404 | primary_channel = channel; | |
e68d2971 S |
405 | } else { |
406 | primary_channel = channel->primary_channel; | |
67fae053 | 407 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 408 | list_del(&channel->sc_list); |
357e836a | 409 | primary_channel->num_sc--; |
67fae053 | 410 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 411 | } |
ca1c4b74 DC |
412 | |
413 | /* | |
414 | * We need to free the bit for init_vp_index() to work in the case | |
415 | * of sub-channel, when we reload drivers like hv_netvsc. | |
416 | */ | |
509879bd S |
417 | if (channel->affinity_policy == HV_LOCALIZED) |
418 | cpumask_clear_cpu(channel->target_cpu, | |
419 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 420 | |
638fea33 DC |
421 | vmbus_release_relid(relid); |
422 | ||
c8705979 | 423 | free_channel(channel); |
4b2f9abe | 424 | } |
8b5d6d3b | 425 | |
93e5bd06 S |
426 | void vmbus_free_channels(void) |
427 | { | |
813c5b79 DC |
428 | struct vmbus_channel *channel, *tmp; |
429 | ||
430 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
431 | listentry) { | |
34c6801e | 432 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 433 | channel->rescind = true; |
93e5bd06 | 434 | |
93e5bd06 | 435 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
436 | } |
437 | } | |
438 | ||
3e189519 | 439 | /* |
e98cb276 | 440 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 441 | * associated with this offer |
bd60c33e | 442 | */ |
2dd37cb8 | 443 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 444 | { |
aded7165 | 445 | struct vmbus_channel *channel; |
188963ec | 446 | bool fnew = true; |
0f5e44ca | 447 | unsigned long flags; |
7047f17d | 448 | u16 dev_type; |
85d9aa70 | 449 | int ret; |
3e7ee490 | 450 | |
454f18a9 | 451 | /* Make sure this is a new offer */ |
d6f591e3 | 452 | mutex_lock(&vmbus_connection.channel_mutex); |
3e7ee490 | 453 | |
6f3d791f S |
454 | /* |
455 | * Now that we have acquired the channel_mutex, | |
456 | * we can release the potentially racing rescind thread. | |
457 | */ | |
458 | atomic_dec(&vmbus_connection.offer_in_progress); | |
459 | ||
da9fcb72 | 460 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
461 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
462 | newchannel->offermsg.offer.if_type) && | |
463 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
464 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 465 | fnew = false; |
3e7ee490 HJ |
466 | break; |
467 | } | |
468 | } | |
469 | ||
8dfd3326 | 470 | if (fnew) |
c50f7fb2 | 471 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 472 | &vmbus_connection.chn_list); |
bd60c33e | 473 | |
d6f591e3 | 474 | mutex_unlock(&vmbus_connection.channel_mutex); |
3e7ee490 | 475 | |
188963ec | 476 | if (!fnew) { |
e68d2971 S |
477 | /* |
478 | * Check to see if this is a sub-channel. | |
479 | */ | |
480 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
481 | /* | |
482 | * Process the sub-channel. | |
483 | */ | |
484 | newchannel->primary_channel = channel; | |
67fae053 | 485 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 486 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 487 | channel->num_sc++; |
357e836a | 488 | spin_unlock_irqrestore(&channel->lock, flags); |
54a66265 | 489 | } else { |
8dfd3326 | 490 | goto err_free_chan; |
54a66265 | 491 | } |
8dfd3326 | 492 | } |
e68d2971 | 493 | |
0f98829a | 494 | dev_type = hv_get_dev_type(newchannel); |
7047f17d S |
495 | |
496 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 497 | |
8dfd3326 VK |
498 | if (newchannel->target_cpu != get_cpu()) { |
499 | put_cpu(); | |
500 | smp_call_function_single(newchannel->target_cpu, | |
501 | percpu_channel_enq, | |
502 | newchannel, true); | |
503 | } else { | |
504 | percpu_channel_enq(newchannel); | |
505 | put_cpu(); | |
3e7ee490 HJ |
506 | } |
507 | ||
42dceebe S |
508 | /* |
509 | * This state is used to indicate a successful open | |
510 | * so that when we do close the channel normally, we | |
511 | * can cleanup properly | |
512 | */ | |
513 | newchannel->state = CHANNEL_OPEN_STATE; | |
514 | ||
8dfd3326 VK |
515 | if (!fnew) { |
516 | if (channel->sc_creation_callback != NULL) | |
517 | channel->sc_creation_callback(newchannel); | |
518 | return; | |
519 | } | |
520 | ||
bd60c33e GKH |
521 | /* |
522 | * Start the process of binding this offer to the driver | |
523 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 524 | * vmbus_child_dev_add() |
bd60c33e | 525 | */ |
f2c73011 | 526 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
527 | &newchannel->offermsg.offer.if_type, |
528 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 529 | newchannel); |
9c3a6f7e | 530 | if (!newchannel->device_obj) |
5b1e5b53 | 531 | goto err_deq_chan; |
3e7ee490 | 532 | |
7047f17d | 533 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
534 | /* |
535 | * Add the new device to the bus. This will kick off device-driver | |
536 | * binding which eventually invokes the device driver's AddDevice() | |
537 | * method. | |
538 | */ | |
85d9aa70 | 539 | ret = vmbus_device_register(newchannel->device_obj); |
85d9aa70 DC |
540 | |
541 | if (ret != 0) { | |
d43e2fe7 DC |
542 | pr_err("unable to add child device object (relid %d)\n", |
543 | newchannel->offermsg.child_relid); | |
544 | kfree(newchannel->device_obj); | |
545 | goto err_deq_chan; | |
546 | } | |
54a66265 | 547 | |
6f3d791f | 548 | newchannel->probe_done = true; |
9c3a6f7e | 549 | return; |
2dd37cb8 | 550 | |
5b1e5b53 | 551 | err_deq_chan: |
d6f591e3 | 552 | mutex_lock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 553 | list_del(&newchannel->listentry); |
d6f591e3 | 554 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
555 | |
556 | if (newchannel->target_cpu != get_cpu()) { | |
557 | put_cpu(); | |
558 | smp_call_function_single(newchannel->target_cpu, | |
559 | percpu_channel_deq, newchannel, true); | |
560 | } else { | |
561 | percpu_channel_deq(newchannel); | |
562 | put_cpu(); | |
563 | } | |
638fea33 DC |
564 | |
565 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 566 | |
9c3a6f7e VK |
567 | err_free_chan: |
568 | free_channel(newchannel); | |
3e7ee490 HJ |
569 | } |
570 | ||
a119845f S |
571 | /* |
572 | * We use this state to statically distribute the channel interrupt load. | |
573 | */ | |
1f656ff3 | 574 | static int next_numa_node_id; |
a119845f S |
575 | |
576 | /* | |
577 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 S |
578 | * channel interrupt load by binding a channel to VCPU. |
579 | * We do this in a hierarchical fashion: | |
580 | * First distribute the primary channels across available NUMA nodes | |
581 | * and then distribute the subchannels amongst the CPUs in the NUMA | |
582 | * node assigned to the primary channel. | |
583 | * | |
584 | * For pre-win8 hosts or non-performance critical channels we assign the | |
585 | * first CPU in the first NUMA node. | |
a119845f | 586 | */ |
7047f17d | 587 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
588 | { |
589 | u32 cur_cpu; | |
7047f17d | 590 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
591 | struct vmbus_channel *primary = channel->primary_channel; |
592 | int next_node; | |
593 | struct cpumask available_mask; | |
9f01ec53 | 594 | struct cpumask *alloced_mask; |
a119845f | 595 | |
a119845f S |
596 | if ((vmbus_proto_version == VERSION_WS2008) || |
597 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
598 | /* | |
599 | * Prior to win8, all channel interrupts are | |
600 | * delivered on cpu 0. | |
601 | * Also if the channel is not a performance critical | |
602 | * channel, bind it to cpu 0. | |
603 | */ | |
1f656ff3 | 604 | channel->numa_node = 0; |
d3ba720d | 605 | channel->target_cpu = 0; |
9c6e64ad | 606 | channel->target_vp = hv_context.vp_index[0]; |
d3ba720d | 607 | return; |
a119845f | 608 | } |
ce59fec8 VK |
609 | |
610 | /* | |
509879bd S |
611 | * Based on the channel affinity policy, we will assign the NUMA |
612 | * nodes. | |
ce59fec8 | 613 | */ |
509879bd S |
614 | |
615 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
616 | while (true) { |
617 | next_node = next_numa_node_id++; | |
509879bd | 618 | if (next_node == nr_node_ids) { |
1f656ff3 | 619 | next_node = next_numa_node_id = 0; |
509879bd S |
620 | continue; |
621 | } | |
1f656ff3 S |
622 | if (cpumask_empty(cpumask_of_node(next_node))) |
623 | continue; | |
624 | break; | |
625 | } | |
626 | channel->numa_node = next_node; | |
627 | primary = channel; | |
628 | } | |
9f01ec53 | 629 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 630 | |
9f01ec53 | 631 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 632 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 633 | /* |
1f656ff3 S |
634 | * We have cycled through all the CPUs in the node; |
635 | * reset the alloced map. | |
ce59fec8 | 636 | */ |
9f01ec53 | 637 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
638 | } |
639 | ||
9f01ec53 | 640 | cpumask_xor(&available_mask, alloced_mask, |
1f656ff3 S |
641 | cpumask_of_node(primary->numa_node)); |
642 | ||
3b71107d | 643 | cur_cpu = -1; |
79fd8e70 | 644 | |
509879bd S |
645 | if (primary->affinity_policy == HV_LOCALIZED) { |
646 | /* | |
647 | * Normally Hyper-V host doesn't create more subchannels | |
648 | * than there are VCPUs on the node but it is possible when not | |
649 | * all present VCPUs on the node are initialized by guest. | |
650 | * Clear the alloced_cpus_in_node to start over. | |
651 | */ | |
652 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
653 | cpumask_of_node(primary->numa_node))) | |
654 | cpumask_clear(&primary->alloced_cpus_in_node); | |
655 | } | |
79fd8e70 | 656 | |
3b71107d DC |
657 | while (true) { |
658 | cur_cpu = cpumask_next(cur_cpu, &available_mask); | |
659 | if (cur_cpu >= nr_cpu_ids) { | |
660 | cur_cpu = -1; | |
661 | cpumask_copy(&available_mask, | |
662 | cpumask_of_node(primary->numa_node)); | |
663 | continue; | |
664 | } | |
665 | ||
509879bd S |
666 | if (primary->affinity_policy == HV_LOCALIZED) { |
667 | /* | |
668 | * NOTE: in the case of sub-channel, we clear the | |
669 | * sub-channel related bit(s) in | |
670 | * primary->alloced_cpus_in_node in | |
671 | * hv_process_channel_removal(), so when we | |
672 | * reload drivers like hv_netvsc in SMP guest, here | |
673 | * we're able to re-allocate | |
674 | * bit from primary->alloced_cpus_in_node. | |
675 | */ | |
676 | if (!cpumask_test_cpu(cur_cpu, | |
677 | &primary->alloced_cpus_in_node)) { | |
678 | cpumask_set_cpu(cur_cpu, | |
679 | &primary->alloced_cpus_in_node); | |
680 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
681 | break; | |
682 | } | |
683 | } else { | |
3b71107d DC |
684 | cpumask_set_cpu(cur_cpu, alloced_mask); |
685 | break; | |
686 | } | |
687 | } | |
1f656ff3 | 688 | |
d3ba720d S |
689 | channel->target_cpu = cur_cpu; |
690 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
691 | } |
692 | ||
41571916 VK |
693 | static void vmbus_wait_for_unload(void) |
694 | { | |
cd95aad5 VK |
695 | int cpu; |
696 | void *page_addr; | |
697 | struct hv_message *msg; | |
41571916 | 698 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 699 | u32 message_type; |
41571916 | 700 | |
cd95aad5 VK |
701 | /* |
702 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
703 | * used for initial contact or to CPU0 depending on host version. When | |
704 | * we're crashing on a different CPU let's hope that IRQ handler on | |
705 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
706 | * functional and vmbus_unload_response() will complete | |
707 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
708 | * read message pages for all CPUs directly. | |
709 | */ | |
41571916 | 710 | while (1) { |
cd95aad5 VK |
711 | if (completion_done(&vmbus_connection.unload_event)) |
712 | break; | |
41571916 | 713 | |
cd95aad5 | 714 | for_each_online_cpu(cpu) { |
37cdd991 SH |
715 | struct hv_per_cpu_context *hv_cpu |
716 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
717 | ||
718 | page_addr = hv_cpu->synic_message_page; | |
719 | msg = (struct hv_message *)page_addr | |
720 | + VMBUS_MESSAGE_SINT; | |
41571916 | 721 | |
cd95aad5 VK |
722 | message_type = READ_ONCE(msg->header.message_type); |
723 | if (message_type == HVMSG_NONE) | |
724 | continue; | |
41571916 | 725 | |
cd95aad5 VK |
726 | hdr = (struct vmbus_channel_message_header *) |
727 | msg->u.payload; | |
728 | ||
729 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
730 | complete(&vmbus_connection.unload_event); | |
731 | ||
732 | vmbus_signal_eom(msg, message_type); | |
733 | } | |
734 | ||
735 | mdelay(10); | |
736 | } | |
737 | ||
738 | /* | |
739 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
740 | * maybe-pending messages on all CPUs to be able to receive new | |
741 | * messages after we reconnect. | |
742 | */ | |
743 | for_each_online_cpu(cpu) { | |
37cdd991 SH |
744 | struct hv_per_cpu_context *hv_cpu |
745 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
746 | ||
747 | page_addr = hv_cpu->synic_message_page; | |
cd95aad5 VK |
748 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
749 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
750 | } |
751 | } | |
752 | ||
2db84eff S |
753 | /* |
754 | * vmbus_unload_response - Handler for the unload response. | |
755 | */ | |
756 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
757 | { | |
758 | /* | |
759 | * This is a global event; just wakeup the waiting thread. | |
760 | * Once we successfully unload, we can cleanup the monitor state. | |
761 | */ | |
762 | complete(&vmbus_connection.unload_event); | |
763 | } | |
764 | ||
75ff3a8a | 765 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
766 | { |
767 | struct vmbus_channel_message_header hdr; | |
768 | ||
4a54243f VK |
769 | /* Pre-Win2012R2 hosts don't support reconnect */ |
770 | if (vmbus_proto_version < VERSION_WIN8_1) | |
771 | return; | |
772 | ||
2db84eff S |
773 | init_completion(&vmbus_connection.unload_event); |
774 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
775 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
c0bb0392 VK |
776 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), |
777 | !crash); | |
2db84eff | 778 | |
41571916 VK |
779 | /* |
780 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
781 | * happening in an interrupt context, where scheduling is impossible. | |
782 | */ | |
75ff3a8a | 783 | if (!crash) |
41571916 VK |
784 | wait_for_completion(&vmbus_connection.unload_event); |
785 | else | |
786 | vmbus_wait_for_unload(); | |
2db84eff S |
787 | } |
788 | ||
3e189519 | 789 | /* |
e98cb276 | 790 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 791 | * |
bd60c33e | 792 | */ |
e98cb276 | 793 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 794 | { |
bd60c33e | 795 | struct vmbus_channel_offer_channel *offer; |
188963ec | 796 | struct vmbus_channel *newchannel; |
3e7ee490 | 797 | |
bd60c33e | 798 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 799 | |
454f18a9 | 800 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 801 | newchannel = alloc_channel(); |
188963ec | 802 | if (!newchannel) { |
9a547602 | 803 | vmbus_release_relid(offer->child_relid); |
54a66265 | 804 | atomic_dec(&vmbus_connection.offer_in_progress); |
0a46618d | 805 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
806 | return; |
807 | } | |
808 | ||
b3bf60c7 S |
809 | /* |
810 | * Setup state for signalling the host. | |
811 | */ | |
812 | newchannel->sig_event = (struct hv_input_signal_event *) | |
813 | (ALIGN((unsigned long) | |
814 | &newchannel->sig_buf, | |
815 | HV_HYPERCALL_PARAM_ALIGN)); | |
816 | ||
817 | newchannel->sig_event->connectionid.asu32 = 0; | |
818 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
819 | newchannel->sig_event->flag_number = 0; | |
820 | newchannel->sig_event->rsvdz = 0; | |
821 | ||
822 | if (vmbus_proto_version != VERSION_WS2008) { | |
823 | newchannel->is_dedicated_interrupt = | |
824 | (offer->is_dedicated_interrupt != 0); | |
825 | newchannel->sig_event->connectionid.u.id = | |
826 | offer->connection_id; | |
827 | } | |
828 | ||
c50f7fb2 | 829 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 830 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
831 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
832 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 833 | |
2dd37cb8 | 834 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
835 | } |
836 | ||
3e189519 | 837 | /* |
e98cb276 | 838 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
839 | * |
840 | * We queue a work item to process this offer synchronously | |
841 | */ | |
e98cb276 | 842 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 843 | { |
bd60c33e | 844 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 845 | struct vmbus_channel *channel; |
d43e2fe7 DC |
846 | unsigned long flags; |
847 | struct device *dev; | |
3e7ee490 | 848 | |
bd60c33e | 849 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 | 850 | |
54a66265 S |
851 | /* |
852 | * The offer msg and the corresponding rescind msg | |
853 | * from the host are guranteed to be ordered - | |
854 | * offer comes in first and then the rescind. | |
855 | * Since we process these events in work elements, | |
856 | * and with preemption, we may end up processing | |
857 | * the events out of order. Given that we handle these | |
858 | * work elements on the same CPU, this is possible only | |
859 | * in the case of preemption. In any case wait here | |
860 | * until the offer processing has moved beyond the | |
861 | * point where the channel is discoverable. | |
862 | */ | |
863 | ||
864 | while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { | |
865 | /* | |
866 | * We wait here until any channel offer is currently | |
867 | * being processed. | |
868 | */ | |
869 | msleep(1); | |
870 | } | |
871 | ||
85d9aa70 | 872 | mutex_lock(&vmbus_connection.channel_mutex); |
d43e2fe7 | 873 | channel = relid2channel(rescind->child_relid); |
54a66265 | 874 | mutex_unlock(&vmbus_connection.channel_mutex); |
98e08702 | 875 | |
2dd37cb8 | 876 | if (channel == NULL) { |
f52078cf | 877 | /* |
54a66265 S |
878 | * We failed in processing the offer message; |
879 | * we would have cleaned up the relid in that | |
880 | * failure path. | |
f52078cf | 881 | */ |
54a66265 | 882 | return; |
2dd37cb8 | 883 | } |
3e7ee490 | 884 | |
d43e2fe7 DC |
885 | spin_lock_irqsave(&channel->lock, flags); |
886 | channel->rescind = true; | |
887 | spin_unlock_irqrestore(&channel->lock, flags); | |
888 | ||
6f3d791f S |
889 | /* |
890 | * Now that we have posted the rescind state, perform | |
891 | * rescind related cleanup. | |
892 | */ | |
ccb61f8a S |
893 | vmbus_rescind_cleanup(channel); |
894 | ||
6f3d791f S |
895 | /* |
896 | * Now wait for offer handling to complete. | |
897 | */ | |
898 | while (READ_ONCE(channel->probe_done) == false) { | |
899 | /* | |
900 | * We wait here until any channel offer is currently | |
901 | * being processed. | |
902 | */ | |
903 | msleep(1); | |
904 | } | |
905 | ||
906 | /* | |
907 | * At this point, the rescind handling can proceed safely. | |
908 | */ | |
909 | ||
d43e2fe7 | 910 | if (channel->device_obj) { |
499e8401 DC |
911 | if (channel->chn_rescind_callback) { |
912 | channel->chn_rescind_callback(channel); | |
54a66265 | 913 | return; |
499e8401 | 914 | } |
d43e2fe7 DC |
915 | /* |
916 | * We will have to unregister this device from the | |
917 | * driver core. | |
918 | */ | |
919 | dev = get_device(&channel->device_obj->device); | |
920 | if (dev) { | |
921 | vmbus_device_unregister(channel->device_obj); | |
922 | put_device(dev); | |
923 | } | |
2dd37cb8 | 924 | } |
54a66265 S |
925 | if (channel->primary_channel != NULL) { |
926 | /* | |
927 | * Sub-channel is being rescinded. Following is the channel | |
928 | * close sequence when initiated from the driveri (refer to | |
929 | * vmbus_close() for details): | |
930 | * 1. Close all sub-channels first | |
931 | * 2. Then close the primary channel. | |
932 | */ | |
933 | if (channel->state == CHANNEL_OPEN_STATE) { | |
934 | /* | |
935 | * The channel is currently not open; | |
936 | * it is safe for us to cleanup the channel. | |
937 | */ | |
938 | mutex_lock(&vmbus_connection.channel_mutex); | |
939 | hv_process_channel_removal(channel, | |
940 | channel->offermsg.child_relid); | |
941 | mutex_unlock(&vmbus_connection.channel_mutex); | |
942 | } | |
943 | } | |
85d9aa70 DC |
944 | } |
945 | ||
946 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
947 | { | |
948 | mutex_lock(&vmbus_connection.channel_mutex); | |
949 | ||
950 | BUG_ON(!is_hvsock_channel(channel)); | |
951 | ||
952 | channel->rescind = true; | |
953 | vmbus_device_unregister(channel->device_obj); | |
954 | ||
955 | mutex_unlock(&vmbus_connection.channel_mutex); | |
3e7ee490 | 956 | } |
85d9aa70 DC |
957 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
958 | ||
3e7ee490 | 959 | |
3e189519 | 960 | /* |
e98cb276 HZ |
961 | * vmbus_onoffers_delivered - |
962 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
963 | * |
964 | * Nothing to do here. | |
965 | */ | |
e98cb276 | 966 | static void vmbus_onoffers_delivered( |
bd60c33e | 967 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 968 | { |
3e7ee490 HJ |
969 | } |
970 | ||
3e189519 | 971 | /* |
e98cb276 | 972 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
973 | * |
974 | * This is invoked when we received a response to our channel open request. | |
975 | * Find the matching request, copy the response and signal the requesting | |
976 | * thread. | |
977 | */ | |
e98cb276 | 978 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 979 | { |
bd60c33e | 980 | struct vmbus_channel_open_result *result; |
188963ec HZ |
981 | struct vmbus_channel_msginfo *msginfo; |
982 | struct vmbus_channel_message_header *requestheader; | |
983 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 984 | unsigned long flags; |
3e7ee490 | 985 | |
bd60c33e | 986 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 987 | |
bd60c33e GKH |
988 | /* |
989 | * Find the open msg, copy the result and signal/unblock the wait event | |
990 | */ | |
15b2f647 | 991 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 992 | |
ebb61e5f HJ |
993 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
994 | msglistentry) { | |
188963ec | 995 | requestheader = |
c50f7fb2 | 996 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 997 | |
c50f7fb2 | 998 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 999 | openmsg = |
c50f7fb2 HZ |
1000 | (struct vmbus_channel_open_channel *)msginfo->msg; |
1001 | if (openmsg->child_relid == result->child_relid && | |
1002 | openmsg->openid == result->openid) { | |
1003 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 1004 | result, |
9568a193 S |
1005 | sizeof( |
1006 | struct vmbus_channel_open_result)); | |
1007 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1008 | break; |
1009 | } | |
1010 | } | |
1011 | } | |
15b2f647 | 1012 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1013 | } |
1014 | ||
3e189519 | 1015 | /* |
e98cb276 | 1016 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
1017 | * |
1018 | * This is invoked when we received a response to our gpadl create request. | |
1019 | * Find the matching request, copy the response and signal the requesting | |
1020 | * thread. | |
1021 | */ | |
e98cb276 | 1022 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1023 | { |
188963ec | 1024 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
1025 | struct vmbus_channel_msginfo *msginfo; |
1026 | struct vmbus_channel_message_header *requestheader; | |
1027 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 1028 | unsigned long flags; |
3e7ee490 | 1029 | |
188963ec | 1030 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 1031 | |
bd60c33e GKH |
1032 | /* |
1033 | * Find the establish msg, copy the result and signal/unblock the wait | |
1034 | * event | |
1035 | */ | |
15b2f647 | 1036 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1037 | |
ebb61e5f HJ |
1038 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1039 | msglistentry) { | |
188963ec | 1040 | requestheader = |
c50f7fb2 | 1041 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1042 | |
c50f7fb2 | 1043 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
1044 | gpadlheader = |
1045 | (struct vmbus_channel_gpadl_header *)requestheader; | |
1046 | ||
c50f7fb2 HZ |
1047 | if ((gpadlcreated->child_relid == |
1048 | gpadlheader->child_relid) && | |
1049 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
1050 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 1051 | gpadlcreated, |
9568a193 S |
1052 | sizeof( |
1053 | struct vmbus_channel_gpadl_created)); | |
1054 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1055 | break; |
1056 | } | |
1057 | } | |
1058 | } | |
15b2f647 | 1059 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1060 | } |
1061 | ||
3e189519 | 1062 | /* |
e98cb276 | 1063 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
1064 | * |
1065 | * This is invoked when we received a response to our gpadl teardown request. | |
1066 | * Find the matching request, copy the response and signal the requesting | |
1067 | * thread. | |
1068 | */ | |
e98cb276 | 1069 | static void vmbus_ongpadl_torndown( |
bd60c33e | 1070 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1071 | { |
188963ec | 1072 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
1073 | struct vmbus_channel_msginfo *msginfo; |
1074 | struct vmbus_channel_message_header *requestheader; | |
1075 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 1076 | unsigned long flags; |
3e7ee490 | 1077 | |
188963ec | 1078 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
1079 | |
1080 | /* | |
1081 | * Find the open msg, copy the result and signal/unblock the wait event | |
1082 | */ | |
15b2f647 | 1083 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1084 | |
ebb61e5f HJ |
1085 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1086 | msglistentry) { | |
188963ec | 1087 | requestheader = |
c50f7fb2 | 1088 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1089 | |
c50f7fb2 | 1090 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
1091 | gpadl_teardown = |
1092 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 1093 | |
c50f7fb2 HZ |
1094 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
1095 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 1096 | gpadl_torndown, |
9568a193 S |
1097 | sizeof( |
1098 | struct vmbus_channel_gpadl_torndown)); | |
1099 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1100 | break; |
1101 | } | |
1102 | } | |
1103 | } | |
15b2f647 | 1104 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1105 | } |
1106 | ||
3e189519 | 1107 | /* |
e98cb276 | 1108 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1109 | * |
1110 | * This is invoked when we received a response to our initiate contact request. | |
1111 | * Find the matching request, copy the response and signal the requesting | |
1112 | * thread. | |
1113 | */ | |
e98cb276 | 1114 | static void vmbus_onversion_response( |
bd60c33e | 1115 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1116 | { |
188963ec HZ |
1117 | struct vmbus_channel_msginfo *msginfo; |
1118 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1119 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1120 | unsigned long flags; |
3e7ee490 | 1121 | |
188963ec | 1122 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 1123 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1124 | |
ebb61e5f HJ |
1125 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1126 | msglistentry) { | |
188963ec | 1127 | requestheader = |
c50f7fb2 | 1128 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1129 | |
c50f7fb2 HZ |
1130 | if (requestheader->msgtype == |
1131 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1132 | memcpy(&msginfo->response.version_response, |
188963ec | 1133 | version_response, |
bd60c33e | 1134 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1135 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1136 | } |
1137 | } | |
15b2f647 | 1138 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1139 | } |
1140 | ||
c8212f04 | 1141 | /* Channel message dispatch table */ |
e6242fa0 SH |
1142 | const struct vmbus_channel_message_table_entry |
1143 | channel_message_table[CHANNELMSG_COUNT] = { | |
1144 | { CHANNELMSG_INVALID, 0, NULL }, | |
1145 | { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, | |
1146 | { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, | |
1147 | { CHANNELMSG_REQUESTOFFERS, 0, NULL }, | |
1148 | { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, | |
1149 | { CHANNELMSG_OPENCHANNEL, 0, NULL }, | |
1150 | { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, | |
1151 | { CHANNELMSG_CLOSECHANNEL, 0, NULL }, | |
1152 | { CHANNELMSG_GPADL_HEADER, 0, NULL }, | |
1153 | { CHANNELMSG_GPADL_BODY, 0, NULL }, | |
1154 | { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, | |
1155 | { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, | |
1156 | { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, | |
1157 | { CHANNELMSG_RELID_RELEASED, 0, NULL }, | |
1158 | { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, | |
1159 | { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, | |
1160 | { CHANNELMSG_UNLOAD, 0, NULL }, | |
1161 | { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, | |
1162 | { CHANNELMSG_18, 0, NULL }, | |
1163 | { CHANNELMSG_19, 0, NULL }, | |
1164 | { CHANNELMSG_20, 0, NULL }, | |
1165 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | |
c8212f04 GKH |
1166 | }; |
1167 | ||
3e189519 | 1168 | /* |
e98cb276 | 1169 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1170 | * |
1171 | * This is invoked in the vmbus worker thread context. | |
1172 | */ | |
e98cb276 | 1173 | void vmbus_onmessage(void *context) |
3e7ee490 | 1174 | { |
188963ec | 1175 | struct hv_message *msg = context; |
82250213 | 1176 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1177 | int size; |
1178 | ||
f6feebe0 HZ |
1179 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1180 | size = msg->header.payload_size; | |
3e7ee490 | 1181 | |
c50f7fb2 | 1182 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1183 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1184 | hdr->msgtype, size); |
04f50c4d | 1185 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1186 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1187 | return; |
1188 | } | |
1189 | ||
b7c6b02f S |
1190 | if (channel_message_table[hdr->msgtype].message_handler) |
1191 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1192 | else |
0a46618d | 1193 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1194 | } |
1195 | ||
3e189519 | 1196 | /* |
e98cb276 | 1197 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1198 | */ |
e98cb276 | 1199 | int vmbus_request_offers(void) |
3e7ee490 | 1200 | { |
82250213 | 1201 | struct vmbus_channel_message_header *msg; |
188963ec | 1202 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1203 | int ret; |
3e7ee490 | 1204 | |
188963ec | 1205 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1206 | sizeof(struct vmbus_channel_message_header), |
1207 | GFP_KERNEL); | |
188963ec | 1208 | if (!msginfo) |
75910f23 | 1209 | return -ENOMEM; |
3e7ee490 | 1210 | |
c50f7fb2 | 1211 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1212 | |
c50f7fb2 | 1213 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1214 | |
3e7ee490 | 1215 | |
c0bb0392 VK |
1216 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), |
1217 | true); | |
bd60c33e | 1218 | if (ret != 0) { |
0a46618d | 1219 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1220 | |
0c3b7b2f S |
1221 | goto cleanup; |
1222 | } | |
3e7ee490 | 1223 | |
0c3b7b2f | 1224 | cleanup: |
dd9b15dc | 1225 | kfree(msginfo); |
3e7ee490 | 1226 | |
3e7ee490 HJ |
1227 | return ret; |
1228 | } | |
1229 | ||
e68d2971 S |
1230 | /* |
1231 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
1232 | * When a primary channel has multiple sub-channels, we try to |
1233 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
1234 | */ |
1235 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
1236 | { | |
1237 | struct list_head *cur, *tmp; | |
87712bf8 | 1238 | int cur_cpu; |
e68d2971 S |
1239 | struct vmbus_channel *cur_channel; |
1240 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
1241 | int next_channel; |
1242 | int i = 1; | |
e68d2971 S |
1243 | |
1244 | if (list_empty(&primary->sc_list)) | |
1245 | return outgoing_channel; | |
1246 | ||
a13e8bbe S |
1247 | next_channel = primary->next_oc++; |
1248 | ||
1249 | if (next_channel > (primary->num_sc)) { | |
1250 | primary->next_oc = 0; | |
1251 | return outgoing_channel; | |
1252 | } | |
1253 | ||
87712bf8 S |
1254 | cur_cpu = hv_context.vp_index[get_cpu()]; |
1255 | put_cpu(); | |
e68d2971 S |
1256 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
1257 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1258 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
1259 | continue; | |
1260 | ||
1261 | if (cur_channel->target_vp == cur_cpu) | |
1262 | return cur_channel; | |
1263 | ||
a13e8bbe S |
1264 | if (i == next_channel) |
1265 | return cur_channel; | |
e68d2971 | 1266 | |
a13e8bbe | 1267 | i++; |
e68d2971 S |
1268 | } |
1269 | ||
1270 | return outgoing_channel; | |
1271 | } | |
1272 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
1273 | ||
1274 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
1275 | { | |
1276 | struct list_head *cur, *tmp; | |
1277 | struct vmbus_channel *cur_channel; | |
1278 | ||
1279 | if (primary_channel->sc_creation_callback == NULL) | |
1280 | return; | |
1281 | ||
1282 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1283 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1284 | ||
1285 | primary_channel->sc_creation_callback(cur_channel); | |
1286 | } | |
1287 | } | |
1288 | ||
1289 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1290 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1291 | { | |
1292 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1293 | } | |
1294 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1295 | ||
1296 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1297 | { | |
1298 | bool ret; | |
1299 | ||
1300 | ret = !list_empty(&primary->sc_list); | |
1301 | ||
1302 | if (ret) { | |
1303 | /* | |
1304 | * Invoke the callback on sub-channel creation. | |
1305 | * This will present a uniform interface to the | |
1306 | * clients. | |
1307 | */ | |
1308 | invoke_sc_cb(primary); | |
1309 | } | |
1310 | ||
1311 | return ret; | |
1312 | } | |
1313 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1314 | |
1315 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1316 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1317 | { | |
1318 | channel->chn_rescind_callback = chn_rescind_cb; | |
1319 | } | |
1320 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |