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, | |
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 | /** |
fe857bb4 | 201 | * vmbus_prep_negotiate_resp() - Create default response for Negotiate message |
c88c4e4c | 202 | * @icmsghdrp: Pointer to msg header structure |
c88c4e4c | 203 | * @buf: Raw buffer channel data |
fe857bb4 DC |
204 | * @fw_version: The framework versions we can support. |
205 | * @fw_vercnt: The size of @fw_version. | |
206 | * @srv_version: The service versions we can support. | |
207 | * @srv_vercnt: The size of @srv_version. | |
208 | * @nego_fw_version: The selected framework version. | |
209 | * @nego_srv_version: The selected service version. | |
c88c4e4c | 210 | * |
fe857bb4 | 211 | * Note: Versions are given in decreasing order. |
c88c4e4c | 212 | * |
fe857bb4 | 213 | * Set up and fill in default negotiate response message. |
c88c4e4c HJ |
214 | * Mainly used by Hyper-V drivers. |
215 | */ | |
6741335b | 216 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
a1656454 AN |
217 | u8 *buf, const int *fw_version, int fw_vercnt, |
218 | const int *srv_version, int srv_vercnt, | |
219 | int *nego_fw_version, int *nego_srv_version) | |
c88c4e4c | 220 | { |
6741335b S |
221 | int icframe_major, icframe_minor; |
222 | int icmsg_major, icmsg_minor; | |
223 | int fw_major, fw_minor; | |
224 | int srv_major, srv_minor; | |
a1656454 | 225 | int i, j; |
6741335b | 226 | bool found_match = false; |
a1656454 | 227 | struct icmsg_negotiate *negop; |
c836d0ab | 228 | |
a3605300 | 229 | icmsghdrp->icmsgsize = 0x10; |
a3605300 S |
230 | negop = (struct icmsg_negotiate *)&buf[ |
231 | sizeof(struct vmbuspipe_hdr) + | |
232 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 233 | |
6741335b S |
234 | icframe_major = negop->icframe_vercnt; |
235 | icframe_minor = 0; | |
236 | ||
237 | icmsg_major = negop->icmsg_vercnt; | |
238 | icmsg_minor = 0; | |
c836d0ab S |
239 | |
240 | /* | |
241 | * Select the framework version number we will | |
242 | * support. | |
243 | */ | |
244 | ||
a1656454 AN |
245 | for (i = 0; i < fw_vercnt; i++) { |
246 | fw_major = (fw_version[i] >> 16); | |
247 | fw_minor = (fw_version[i] & 0xFFFF); | |
248 | ||
249 | for (j = 0; j < negop->icframe_vercnt; j++) { | |
250 | if ((negop->icversion_data[j].major == fw_major) && | |
251 | (negop->icversion_data[j].minor == fw_minor)) { | |
252 | icframe_major = negop->icversion_data[j].major; | |
253 | icframe_minor = negop->icversion_data[j].minor; | |
254 | found_match = true; | |
255 | break; | |
256 | } | |
6741335b | 257 | } |
a1656454 AN |
258 | |
259 | if (found_match) | |
260 | break; | |
c836d0ab S |
261 | } |
262 | ||
6741335b S |
263 | if (!found_match) |
264 | goto fw_error; | |
265 | ||
266 | found_match = false; | |
267 | ||
a1656454 AN |
268 | for (i = 0; i < srv_vercnt; i++) { |
269 | srv_major = (srv_version[i] >> 16); | |
270 | srv_minor = (srv_version[i] & 0xFFFF); | |
271 | ||
272 | for (j = negop->icframe_vercnt; | |
273 | (j < negop->icframe_vercnt + negop->icmsg_vercnt); | |
274 | j++) { | |
275 | ||
276 | if ((negop->icversion_data[j].major == srv_major) && | |
277 | (negop->icversion_data[j].minor == srv_minor)) { | |
278 | ||
279 | icmsg_major = negop->icversion_data[j].major; | |
280 | icmsg_minor = negop->icversion_data[j].minor; | |
281 | found_match = true; | |
282 | break; | |
283 | } | |
6741335b | 284 | } |
a1656454 AN |
285 | |
286 | if (found_match) | |
287 | break; | |
c88c4e4c | 288 | } |
a3605300 | 289 | |
c836d0ab | 290 | /* |
6741335b | 291 | * Respond with the framework and service |
c836d0ab S |
292 | * version numbers we can support. |
293 | */ | |
6741335b S |
294 | |
295 | fw_error: | |
296 | if (!found_match) { | |
297 | negop->icframe_vercnt = 0; | |
298 | negop->icmsg_vercnt = 0; | |
299 | } else { | |
300 | negop->icframe_vercnt = 1; | |
301 | negop->icmsg_vercnt = 1; | |
302 | } | |
303 | ||
a1656454 AN |
304 | if (nego_fw_version) |
305 | *nego_fw_version = (icframe_major << 16) | icframe_minor; | |
306 | ||
307 | if (nego_srv_version) | |
308 | *nego_srv_version = (icmsg_major << 16) | icmsg_minor; | |
309 | ||
6741335b S |
310 | negop->icversion_data[0].major = icframe_major; |
311 | negop->icversion_data[0].minor = icframe_minor; | |
312 | negop->icversion_data[1].major = icmsg_major; | |
313 | negop->icversion_data[1].minor = icmsg_minor; | |
314 | return found_match; | |
c88c4e4c | 315 | } |
a3605300 | 316 | |
da0e9631 | 317 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 318 | |
3e189519 | 319 | /* |
e98cb276 | 320 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 321 | */ |
50fe56d2 | 322 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 323 | { |
aded7165 | 324 | struct vmbus_channel *channel; |
3e7ee490 | 325 | |
aded7165 | 326 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 327 | if (!channel) |
3e7ee490 | 328 | return NULL; |
3e7ee490 | 329 | |
67fae053 | 330 | spin_lock_init(&channel->lock); |
7fa32e5e | 331 | init_completion(&channel->rescind_event); |
e68d2971 S |
332 | |
333 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 334 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 335 | |
631e63a9 SH |
336 | tasklet_init(&channel->callback_event, |
337 | vmbus_on_event, (unsigned long)channel); | |
338 | ||
3e7ee490 HJ |
339 | return channel; |
340 | } | |
341 | ||
3e189519 | 342 | /* |
e98cb276 | 343 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 344 | */ |
9f3e28e3 | 345 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 346 | { |
631e63a9 | 347 | tasklet_kill(&channel->callback_event); |
8200f208 | 348 | |
c2e5df61 | 349 | kobject_put(&channel->kobj); |
3e7ee490 HJ |
350 | } |
351 | ||
3a28fa35 S |
352 | static void percpu_channel_enq(void *arg) |
353 | { | |
354 | struct vmbus_channel *channel = arg; | |
37cdd991 SH |
355 | struct hv_per_cpu_context *hv_cpu |
356 | = this_cpu_ptr(hv_context.cpu_context); | |
3a28fa35 | 357 | |
8200f208 | 358 | list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list); |
3a28fa35 | 359 | } |
8b5d6d3b | 360 | |
3a28fa35 S |
361 | static void percpu_channel_deq(void *arg) |
362 | { | |
363 | struct vmbus_channel *channel = arg; | |
364 | ||
8200f208 | 365 | list_del_rcu(&channel->percpu_list); |
3a28fa35 | 366 | } |
8b5d6d3b | 367 | |
ed6cfcc5 | 368 | |
f52078cf | 369 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 370 | { |
ed6cfcc5 | 371 | struct vmbus_channel_relid_released msg; |
259cc665 | 372 | int ret; |
4b2f9abe | 373 | |
c8705979 | 374 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 375 | msg.child_relid = relid; |
c8705979 | 376 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
259cc665 VK |
377 | ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released), |
378 | true); | |
379 | ||
380 | trace_vmbus_release_relid(&msg, ret); | |
f52078cf | 381 | } |
c8705979 | 382 | |
800b9329 | 383 | void hv_process_channel_removal(struct vmbus_channel *channel) |
f52078cf | 384 | { |
800b9329 | 385 | struct vmbus_channel *primary_channel; |
f52078cf | 386 | unsigned long flags; |
f52078cf | 387 | |
85d9aa70 | 388 | BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); |
192b2d78 | 389 | BUG_ON(!channel->rescind); |
800b9329 | 390 | |
2115b561 S |
391 | if (channel->target_cpu != get_cpu()) { |
392 | put_cpu(); | |
3a28fa35 S |
393 | smp_call_function_single(channel->target_cpu, |
394 | percpu_channel_deq, channel, true); | |
2115b561 | 395 | } else { |
3a28fa35 | 396 | percpu_channel_deq(channel); |
2115b561 S |
397 | put_cpu(); |
398 | } | |
3a28fa35 | 399 | |
e68d2971 | 400 | if (channel->primary_channel == NULL) { |
e68d2971 | 401 | list_del(&channel->listentry); |
ca1c4b74 DC |
402 | |
403 | primary_channel = channel; | |
e68d2971 S |
404 | } else { |
405 | primary_channel = channel->primary_channel; | |
67fae053 | 406 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 407 | list_del(&channel->sc_list); |
357e836a | 408 | primary_channel->num_sc--; |
67fae053 | 409 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 410 | } |
ca1c4b74 DC |
411 | |
412 | /* | |
413 | * We need to free the bit for init_vp_index() to work in the case | |
414 | * of sub-channel, when we reload drivers like hv_netvsc. | |
415 | */ | |
509879bd S |
416 | if (channel->affinity_policy == HV_LOCALIZED) |
417 | cpumask_clear_cpu(channel->target_cpu, | |
418 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 419 | |
800b9329 | 420 | vmbus_release_relid(channel->offermsg.child_relid); |
638fea33 | 421 | |
c8705979 | 422 | free_channel(channel); |
4b2f9abe | 423 | } |
8b5d6d3b | 424 | |
93e5bd06 S |
425 | void vmbus_free_channels(void) |
426 | { | |
813c5b79 DC |
427 | struct vmbus_channel *channel, *tmp; |
428 | ||
429 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
430 | listentry) { | |
34c6801e | 431 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 432 | channel->rescind = true; |
93e5bd06 | 433 | |
93e5bd06 | 434 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
435 | } |
436 | } | |
437 | ||
3e189519 | 438 | /* |
e98cb276 | 439 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 440 | * associated with this offer |
bd60c33e | 441 | */ |
2dd37cb8 | 442 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 443 | { |
aded7165 | 444 | struct vmbus_channel *channel; |
188963ec | 445 | bool fnew = true; |
0f5e44ca | 446 | unsigned long flags; |
7047f17d | 447 | u16 dev_type; |
85d9aa70 | 448 | int ret; |
3e7ee490 | 449 | |
454f18a9 | 450 | /* Make sure this is a new offer */ |
d6f591e3 | 451 | mutex_lock(&vmbus_connection.channel_mutex); |
3e7ee490 | 452 | |
6f3d791f S |
453 | /* |
454 | * Now that we have acquired the channel_mutex, | |
455 | * we can release the potentially racing rescind thread. | |
456 | */ | |
457 | atomic_dec(&vmbus_connection.offer_in_progress); | |
458 | ||
da9fcb72 | 459 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
460 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
461 | newchannel->offermsg.offer.if_type) && | |
462 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
463 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 464 | fnew = false; |
3e7ee490 HJ |
465 | break; |
466 | } | |
467 | } | |
468 | ||
8dfd3326 | 469 | if (fnew) |
c50f7fb2 | 470 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 471 | &vmbus_connection.chn_list); |
bd60c33e | 472 | |
d6f591e3 | 473 | mutex_unlock(&vmbus_connection.channel_mutex); |
3e7ee490 | 474 | |
188963ec | 475 | if (!fnew) { |
e68d2971 S |
476 | /* |
477 | * Check to see if this is a sub-channel. | |
478 | */ | |
479 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
480 | /* | |
481 | * Process the sub-channel. | |
482 | */ | |
483 | newchannel->primary_channel = channel; | |
67fae053 | 484 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 485 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 486 | channel->num_sc++; |
357e836a | 487 | spin_unlock_irqrestore(&channel->lock, flags); |
54a66265 | 488 | } else { |
8dfd3326 | 489 | goto err_free_chan; |
54a66265 | 490 | } |
8dfd3326 | 491 | } |
e68d2971 | 492 | |
0f98829a | 493 | dev_type = hv_get_dev_type(newchannel); |
7047f17d S |
494 | |
495 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 496 | |
8dfd3326 VK |
497 | if (newchannel->target_cpu != get_cpu()) { |
498 | put_cpu(); | |
499 | smp_call_function_single(newchannel->target_cpu, | |
500 | percpu_channel_enq, | |
501 | newchannel, true); | |
502 | } else { | |
503 | percpu_channel_enq(newchannel); | |
504 | put_cpu(); | |
3e7ee490 HJ |
505 | } |
506 | ||
42dceebe S |
507 | /* |
508 | * This state is used to indicate a successful open | |
509 | * so that when we do close the channel normally, we | |
510 | * can cleanup properly | |
511 | */ | |
512 | newchannel->state = CHANNEL_OPEN_STATE; | |
513 | ||
8dfd3326 | 514 | if (!fnew) { |
c2e5df61 SH |
515 | struct hv_device *dev |
516 | = newchannel->primary_channel->device_obj; | |
517 | ||
50229128 | 518 | if (vmbus_add_channel_kobj(dev, newchannel)) |
c2e5df61 | 519 | goto err_free_chan; |
c2e5df61 | 520 | |
8dfd3326 VK |
521 | if (channel->sc_creation_callback != NULL) |
522 | channel->sc_creation_callback(newchannel); | |
192b2d78 | 523 | newchannel->probe_done = true; |
8dfd3326 VK |
524 | return; |
525 | } | |
526 | ||
bd60c33e GKH |
527 | /* |
528 | * Start the process of binding this offer to the driver | |
529 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 530 | * vmbus_child_dev_add() |
bd60c33e | 531 | */ |
f2c73011 | 532 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
533 | &newchannel->offermsg.offer.if_type, |
534 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 535 | newchannel); |
9c3a6f7e | 536 | if (!newchannel->device_obj) |
5b1e5b53 | 537 | goto err_deq_chan; |
3e7ee490 | 538 | |
7047f17d | 539 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
540 | /* |
541 | * Add the new device to the bus. This will kick off device-driver | |
542 | * binding which eventually invokes the device driver's AddDevice() | |
543 | * method. | |
544 | */ | |
85d9aa70 | 545 | ret = vmbus_device_register(newchannel->device_obj); |
85d9aa70 DC |
546 | |
547 | if (ret != 0) { | |
d43e2fe7 DC |
548 | pr_err("unable to add child device object (relid %d)\n", |
549 | newchannel->offermsg.child_relid); | |
550 | kfree(newchannel->device_obj); | |
551 | goto err_deq_chan; | |
552 | } | |
54a66265 | 553 | |
6f3d791f | 554 | newchannel->probe_done = true; |
9c3a6f7e | 555 | return; |
2dd37cb8 | 556 | |
5b1e5b53 | 557 | err_deq_chan: |
d6f591e3 | 558 | mutex_lock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 559 | list_del(&newchannel->listentry); |
d6f591e3 | 560 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
561 | |
562 | if (newchannel->target_cpu != get_cpu()) { | |
563 | put_cpu(); | |
564 | smp_call_function_single(newchannel->target_cpu, | |
565 | percpu_channel_deq, newchannel, true); | |
566 | } else { | |
567 | percpu_channel_deq(newchannel); | |
568 | put_cpu(); | |
569 | } | |
638fea33 DC |
570 | |
571 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 572 | |
9c3a6f7e VK |
573 | err_free_chan: |
574 | free_channel(newchannel); | |
3e7ee490 HJ |
575 | } |
576 | ||
a119845f S |
577 | /* |
578 | * We use this state to statically distribute the channel interrupt load. | |
579 | */ | |
1f656ff3 | 580 | static int next_numa_node_id; |
a119845f S |
581 | |
582 | /* | |
583 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 | 584 | * channel interrupt load by binding a channel to VCPU. |
ce767047 HZ |
585 | * We distribute the interrupt loads to one or more NUMA nodes based on |
586 | * the channel's affinity_policy. | |
1f656ff3 S |
587 | * |
588 | * For pre-win8 hosts or non-performance critical channels we assign the | |
589 | * first CPU in the first NUMA node. | |
a119845f | 590 | */ |
7047f17d | 591 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
592 | { |
593 | u32 cur_cpu; | |
7047f17d | 594 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
595 | struct vmbus_channel *primary = channel->primary_channel; |
596 | int next_node; | |
25355252 | 597 | cpumask_var_t available_mask; |
9f01ec53 | 598 | struct cpumask *alloced_mask; |
a119845f | 599 | |
a119845f | 600 | if ((vmbus_proto_version == VERSION_WS2008) || |
25355252 DC |
601 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || |
602 | !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { | |
a119845f S |
603 | /* |
604 | * Prior to win8, all channel interrupts are | |
605 | * delivered on cpu 0. | |
606 | * Also if the channel is not a performance critical | |
607 | * channel, bind it to cpu 0. | |
25355252 | 608 | * In case alloc_cpumask_var() fails, bind it to cpu 0. |
a119845f | 609 | */ |
1f656ff3 | 610 | channel->numa_node = 0; |
d3ba720d | 611 | channel->target_cpu = 0; |
7415aea6 | 612 | channel->target_vp = hv_cpu_number_to_vp_number(0); |
d3ba720d | 613 | return; |
a119845f | 614 | } |
ce59fec8 VK |
615 | |
616 | /* | |
509879bd S |
617 | * Based on the channel affinity policy, we will assign the NUMA |
618 | * nodes. | |
ce59fec8 | 619 | */ |
509879bd S |
620 | |
621 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
622 | while (true) { |
623 | next_node = next_numa_node_id++; | |
509879bd | 624 | if (next_node == nr_node_ids) { |
1f656ff3 | 625 | next_node = next_numa_node_id = 0; |
509879bd S |
626 | continue; |
627 | } | |
1f656ff3 S |
628 | if (cpumask_empty(cpumask_of_node(next_node))) |
629 | continue; | |
630 | break; | |
631 | } | |
632 | channel->numa_node = next_node; | |
633 | primary = channel; | |
634 | } | |
9f01ec53 | 635 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 636 | |
9f01ec53 | 637 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 638 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 639 | /* |
1f656ff3 S |
640 | * We have cycled through all the CPUs in the node; |
641 | * reset the alloced map. | |
ce59fec8 | 642 | */ |
9f01ec53 | 643 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
644 | } |
645 | ||
25355252 | 646 | cpumask_xor(available_mask, alloced_mask, |
1f656ff3 S |
647 | cpumask_of_node(primary->numa_node)); |
648 | ||
3b71107d | 649 | cur_cpu = -1; |
79fd8e70 | 650 | |
509879bd S |
651 | if (primary->affinity_policy == HV_LOCALIZED) { |
652 | /* | |
653 | * Normally Hyper-V host doesn't create more subchannels | |
654 | * than there are VCPUs on the node but it is possible when not | |
655 | * all present VCPUs on the node are initialized by guest. | |
656 | * Clear the alloced_cpus_in_node to start over. | |
657 | */ | |
658 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
659 | cpumask_of_node(primary->numa_node))) | |
660 | cpumask_clear(&primary->alloced_cpus_in_node); | |
661 | } | |
79fd8e70 | 662 | |
3b71107d | 663 | while (true) { |
25355252 | 664 | cur_cpu = cpumask_next(cur_cpu, available_mask); |
3b71107d DC |
665 | if (cur_cpu >= nr_cpu_ids) { |
666 | cur_cpu = -1; | |
25355252 | 667 | cpumask_copy(available_mask, |
3b71107d DC |
668 | cpumask_of_node(primary->numa_node)); |
669 | continue; | |
670 | } | |
671 | ||
509879bd S |
672 | if (primary->affinity_policy == HV_LOCALIZED) { |
673 | /* | |
674 | * NOTE: in the case of sub-channel, we clear the | |
675 | * sub-channel related bit(s) in | |
676 | * primary->alloced_cpus_in_node in | |
677 | * hv_process_channel_removal(), so when we | |
678 | * reload drivers like hv_netvsc in SMP guest, here | |
679 | * we're able to re-allocate | |
680 | * bit from primary->alloced_cpus_in_node. | |
681 | */ | |
682 | if (!cpumask_test_cpu(cur_cpu, | |
683 | &primary->alloced_cpus_in_node)) { | |
684 | cpumask_set_cpu(cur_cpu, | |
685 | &primary->alloced_cpus_in_node); | |
686 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
687 | break; | |
688 | } | |
689 | } else { | |
3b71107d DC |
690 | cpumask_set_cpu(cur_cpu, alloced_mask); |
691 | break; | |
692 | } | |
693 | } | |
1f656ff3 | 694 | |
d3ba720d | 695 | channel->target_cpu = cur_cpu; |
7415aea6 | 696 | channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); |
25355252 DC |
697 | |
698 | free_cpumask_var(available_mask); | |
a119845f S |
699 | } |
700 | ||
41571916 VK |
701 | static void vmbus_wait_for_unload(void) |
702 | { | |
cd95aad5 VK |
703 | int cpu; |
704 | void *page_addr; | |
705 | struct hv_message *msg; | |
41571916 | 706 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 707 | u32 message_type; |
41571916 | 708 | |
cd95aad5 VK |
709 | /* |
710 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
711 | * used for initial contact or to CPU0 depending on host version. When | |
712 | * we're crashing on a different CPU let's hope that IRQ handler on | |
713 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
714 | * functional and vmbus_unload_response() will complete | |
715 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
716 | * read message pages for all CPUs directly. | |
717 | */ | |
41571916 | 718 | while (1) { |
cd95aad5 VK |
719 | if (completion_done(&vmbus_connection.unload_event)) |
720 | break; | |
41571916 | 721 | |
cd95aad5 | 722 | for_each_online_cpu(cpu) { |
37cdd991 SH |
723 | struct hv_per_cpu_context *hv_cpu |
724 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
725 | ||
726 | page_addr = hv_cpu->synic_message_page; | |
727 | msg = (struct hv_message *)page_addr | |
728 | + VMBUS_MESSAGE_SINT; | |
41571916 | 729 | |
cd95aad5 VK |
730 | message_type = READ_ONCE(msg->header.message_type); |
731 | if (message_type == HVMSG_NONE) | |
732 | continue; | |
41571916 | 733 | |
cd95aad5 VK |
734 | hdr = (struct vmbus_channel_message_header *) |
735 | msg->u.payload; | |
736 | ||
737 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
738 | complete(&vmbus_connection.unload_event); | |
739 | ||
740 | vmbus_signal_eom(msg, message_type); | |
741 | } | |
742 | ||
743 | mdelay(10); | |
744 | } | |
745 | ||
746 | /* | |
747 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
748 | * maybe-pending messages on all CPUs to be able to receive new | |
749 | * messages after we reconnect. | |
750 | */ | |
751 | for_each_online_cpu(cpu) { | |
37cdd991 SH |
752 | struct hv_per_cpu_context *hv_cpu |
753 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
754 | ||
755 | page_addr = hv_cpu->synic_message_page; | |
cd95aad5 VK |
756 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
757 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
758 | } |
759 | } | |
760 | ||
2db84eff S |
761 | /* |
762 | * vmbus_unload_response - Handler for the unload response. | |
763 | */ | |
764 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
765 | { | |
766 | /* | |
767 | * This is a global event; just wakeup the waiting thread. | |
768 | * Once we successfully unload, we can cleanup the monitor state. | |
769 | */ | |
770 | complete(&vmbus_connection.unload_event); | |
771 | } | |
772 | ||
75ff3a8a | 773 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
774 | { |
775 | struct vmbus_channel_message_header hdr; | |
776 | ||
4a54243f VK |
777 | /* Pre-Win2012R2 hosts don't support reconnect */ |
778 | if (vmbus_proto_version < VERSION_WIN8_1) | |
779 | return; | |
780 | ||
2db84eff S |
781 | init_completion(&vmbus_connection.unload_event); |
782 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
783 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
c0bb0392 VK |
784 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), |
785 | !crash); | |
2db84eff | 786 | |
41571916 VK |
787 | /* |
788 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
789 | * happening in an interrupt context, where scheduling is impossible. | |
790 | */ | |
75ff3a8a | 791 | if (!crash) |
41571916 VK |
792 | wait_for_completion(&vmbus_connection.unload_event); |
793 | else | |
794 | vmbus_wait_for_unload(); | |
2db84eff S |
795 | } |
796 | ||
3e189519 | 797 | /* |
e98cb276 | 798 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 799 | * |
bd60c33e | 800 | */ |
e98cb276 | 801 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 802 | { |
bd60c33e | 803 | struct vmbus_channel_offer_channel *offer; |
188963ec | 804 | struct vmbus_channel *newchannel; |
3e7ee490 | 805 | |
bd60c33e | 806 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 807 | |
03b81e66 VK |
808 | trace_vmbus_onoffer(offer); |
809 | ||
454f18a9 | 810 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 811 | newchannel = alloc_channel(); |
188963ec | 812 | if (!newchannel) { |
9a547602 | 813 | vmbus_release_relid(offer->child_relid); |
54a66265 | 814 | atomic_dec(&vmbus_connection.offer_in_progress); |
0a46618d | 815 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
816 | return; |
817 | } | |
818 | ||
b3bf60c7 S |
819 | /* |
820 | * Setup state for signalling the host. | |
821 | */ | |
05784171 | 822 | newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID; |
b3bf60c7 S |
823 | |
824 | if (vmbus_proto_version != VERSION_WS2008) { | |
825 | newchannel->is_dedicated_interrupt = | |
826 | (offer->is_dedicated_interrupt != 0); | |
05784171 | 827 | newchannel->sig_event = offer->connection_id; |
b3bf60c7 S |
828 | } |
829 | ||
c50f7fb2 | 830 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 831 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
832 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
833 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 834 | |
2dd37cb8 | 835 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
836 | } |
837 | ||
3e189519 | 838 | /* |
e98cb276 | 839 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
840 | * |
841 | * We queue a work item to process this offer synchronously | |
842 | */ | |
e98cb276 | 843 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 844 | { |
bd60c33e | 845 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 846 | struct vmbus_channel *channel; |
d43e2fe7 | 847 | struct device *dev; |
3e7ee490 | 848 | |
bd60c33e | 849 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 | 850 | |
5175167c VK |
851 | trace_vmbus_onoffer_rescind(rescind); |
852 | ||
54a66265 S |
853 | /* |
854 | * The offer msg and the corresponding rescind msg | |
855 | * from the host are guranteed to be ordered - | |
856 | * offer comes in first and then the rescind. | |
857 | * Since we process these events in work elements, | |
858 | * and with preemption, we may end up processing | |
859 | * the events out of order. Given that we handle these | |
860 | * work elements on the same CPU, this is possible only | |
861 | * in the case of preemption. In any case wait here | |
862 | * until the offer processing has moved beyond the | |
863 | * point where the channel is discoverable. | |
864 | */ | |
865 | ||
866 | while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { | |
867 | /* | |
868 | * We wait here until any channel offer is currently | |
869 | * being processed. | |
870 | */ | |
871 | msleep(1); | |
872 | } | |
873 | ||
85d9aa70 | 874 | mutex_lock(&vmbus_connection.channel_mutex); |
d43e2fe7 | 875 | channel = relid2channel(rescind->child_relid); |
54a66265 | 876 | mutex_unlock(&vmbus_connection.channel_mutex); |
98e08702 | 877 | |
2dd37cb8 | 878 | if (channel == NULL) { |
f52078cf | 879 | /* |
54a66265 S |
880 | * We failed in processing the offer message; |
881 | * we would have cleaned up the relid in that | |
882 | * failure path. | |
f52078cf | 883 | */ |
54a66265 | 884 | return; |
2dd37cb8 | 885 | } |
3e7ee490 | 886 | |
d3b26dd7 DC |
887 | /* |
888 | * Before setting channel->rescind in vmbus_rescind_cleanup(), we | |
889 | * should make sure the channel callback is not running any more. | |
890 | */ | |
891 | vmbus_reset_channel_cb(channel); | |
892 | ||
6f3d791f S |
893 | /* |
894 | * Now wait for offer handling to complete. | |
895 | */ | |
7fa32e5e | 896 | vmbus_rescind_cleanup(channel); |
6f3d791f S |
897 | while (READ_ONCE(channel->probe_done) == false) { |
898 | /* | |
899 | * We wait here until any channel offer is currently | |
900 | * being processed. | |
901 | */ | |
902 | msleep(1); | |
903 | } | |
904 | ||
905 | /* | |
906 | * At this point, the rescind handling can proceed safely. | |
907 | */ | |
908 | ||
d43e2fe7 | 909 | if (channel->device_obj) { |
499e8401 DC |
910 | if (channel->chn_rescind_callback) { |
911 | channel->chn_rescind_callback(channel); | |
54a66265 | 912 | return; |
499e8401 | 913 | } |
d43e2fe7 DC |
914 | /* |
915 | * We will have to unregister this device from the | |
916 | * driver core. | |
917 | */ | |
918 | dev = get_device(&channel->device_obj->device); | |
919 | if (dev) { | |
920 | vmbus_device_unregister(channel->device_obj); | |
921 | put_device(dev); | |
922 | } | |
2dd37cb8 | 923 | } |
54a66265 S |
924 | if (channel->primary_channel != NULL) { |
925 | /* | |
926 | * Sub-channel is being rescinded. Following is the channel | |
927 | * close sequence when initiated from the driveri (refer to | |
928 | * vmbus_close() for details): | |
929 | * 1. Close all sub-channels first | |
930 | * 2. Then close the primary channel. | |
931 | */ | |
192b2d78 | 932 | mutex_lock(&vmbus_connection.channel_mutex); |
54a66265 S |
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 | */ | |
800b9329 | 938 | hv_process_channel_removal(channel); |
7fa32e5e S |
939 | } else { |
940 | complete(&channel->rescind_event); | |
54a66265 | 941 | } |
192b2d78 | 942 | mutex_unlock(&vmbus_connection.channel_mutex); |
54a66265 | 943 | } |
85d9aa70 DC |
944 | } |
945 | ||
946 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
947 | { | |
85d9aa70 DC |
948 | BUG_ON(!is_hvsock_channel(channel)); |
949 | ||
9d35593b DC |
950 | /* We always get a rescind msg when a connection is closed. */ |
951 | while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind)) | |
952 | msleep(1); | |
953 | ||
85d9aa70 | 954 | vmbus_device_unregister(channel->device_obj); |
3e7ee490 | 955 | } |
85d9aa70 DC |
956 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
957 | ||
3e7ee490 | 958 | |
3e189519 | 959 | /* |
e98cb276 HZ |
960 | * vmbus_onoffers_delivered - |
961 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
962 | * |
963 | * Nothing to do here. | |
964 | */ | |
e98cb276 | 965 | static void vmbus_onoffers_delivered( |
bd60c33e | 966 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 967 | { |
3e7ee490 HJ |
968 | } |
969 | ||
3e189519 | 970 | /* |
e98cb276 | 971 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
972 | * |
973 | * This is invoked when we received a response to our channel open request. | |
974 | * Find the matching request, copy the response and signal the requesting | |
975 | * thread. | |
976 | */ | |
e98cb276 | 977 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 978 | { |
bd60c33e | 979 | struct vmbus_channel_open_result *result; |
188963ec HZ |
980 | struct vmbus_channel_msginfo *msginfo; |
981 | struct vmbus_channel_message_header *requestheader; | |
982 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 983 | unsigned long flags; |
3e7ee490 | 984 | |
bd60c33e | 985 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 986 | |
9f23ce1a VK |
987 | trace_vmbus_onopen_result(result); |
988 | ||
bd60c33e GKH |
989 | /* |
990 | * Find the open msg, copy the result and signal/unblock the wait event | |
991 | */ | |
15b2f647 | 992 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 993 | |
ebb61e5f HJ |
994 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
995 | msglistentry) { | |
188963ec | 996 | requestheader = |
c50f7fb2 | 997 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 998 | |
c50f7fb2 | 999 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 1000 | openmsg = |
c50f7fb2 HZ |
1001 | (struct vmbus_channel_open_channel *)msginfo->msg; |
1002 | if (openmsg->child_relid == result->child_relid && | |
1003 | openmsg->openid == result->openid) { | |
1004 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 1005 | result, |
9568a193 S |
1006 | sizeof( |
1007 | struct vmbus_channel_open_result)); | |
1008 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1009 | break; |
1010 | } | |
1011 | } | |
1012 | } | |
15b2f647 | 1013 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1014 | } |
1015 | ||
3e189519 | 1016 | /* |
e98cb276 | 1017 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
1018 | * |
1019 | * This is invoked when we received a response to our gpadl create request. | |
1020 | * Find the matching request, copy the response and signal the requesting | |
1021 | * thread. | |
1022 | */ | |
e98cb276 | 1023 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1024 | { |
188963ec | 1025 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
1026 | struct vmbus_channel_msginfo *msginfo; |
1027 | struct vmbus_channel_message_header *requestheader; | |
1028 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 1029 | unsigned long flags; |
3e7ee490 | 1030 | |
188963ec | 1031 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 1032 | |
a13bf0ea VK |
1033 | trace_vmbus_ongpadl_created(gpadlcreated); |
1034 | ||
bd60c33e GKH |
1035 | /* |
1036 | * Find the establish msg, copy the result and signal/unblock the wait | |
1037 | * event | |
1038 | */ | |
15b2f647 | 1039 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1040 | |
ebb61e5f HJ |
1041 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1042 | msglistentry) { | |
188963ec | 1043 | requestheader = |
c50f7fb2 | 1044 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1045 | |
c50f7fb2 | 1046 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
1047 | gpadlheader = |
1048 | (struct vmbus_channel_gpadl_header *)requestheader; | |
1049 | ||
c50f7fb2 HZ |
1050 | if ((gpadlcreated->child_relid == |
1051 | gpadlheader->child_relid) && | |
1052 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
1053 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 1054 | gpadlcreated, |
9568a193 S |
1055 | sizeof( |
1056 | struct vmbus_channel_gpadl_created)); | |
1057 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1058 | break; |
1059 | } | |
1060 | } | |
1061 | } | |
15b2f647 | 1062 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1063 | } |
1064 | ||
3e189519 | 1065 | /* |
e98cb276 | 1066 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
1067 | * |
1068 | * This is invoked when we received a response to our gpadl teardown request. | |
1069 | * Find the matching request, copy the response and signal the requesting | |
1070 | * thread. | |
1071 | */ | |
e98cb276 | 1072 | static void vmbus_ongpadl_torndown( |
bd60c33e | 1073 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1074 | { |
188963ec | 1075 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
1076 | struct vmbus_channel_msginfo *msginfo; |
1077 | struct vmbus_channel_message_header *requestheader; | |
1078 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 1079 | unsigned long flags; |
3e7ee490 | 1080 | |
188963ec | 1081 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e | 1082 | |
602a8c52 VK |
1083 | trace_vmbus_ongpadl_torndown(gpadl_torndown); |
1084 | ||
bd60c33e GKH |
1085 | /* |
1086 | * Find the open msg, copy the result and signal/unblock the wait event | |
1087 | */ | |
15b2f647 | 1088 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1089 | |
ebb61e5f HJ |
1090 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1091 | msglistentry) { | |
188963ec | 1092 | requestheader = |
c50f7fb2 | 1093 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1094 | |
c50f7fb2 | 1095 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
1096 | gpadl_teardown = |
1097 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 1098 | |
c50f7fb2 HZ |
1099 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
1100 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 1101 | gpadl_torndown, |
9568a193 S |
1102 | sizeof( |
1103 | struct vmbus_channel_gpadl_torndown)); | |
1104 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1105 | break; |
1106 | } | |
1107 | } | |
1108 | } | |
15b2f647 | 1109 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1110 | } |
1111 | ||
3e189519 | 1112 | /* |
e98cb276 | 1113 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1114 | * |
1115 | * This is invoked when we received a response to our initiate contact request. | |
1116 | * Find the matching request, copy the response and signal the requesting | |
1117 | * thread. | |
1118 | */ | |
e98cb276 | 1119 | static void vmbus_onversion_response( |
bd60c33e | 1120 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1121 | { |
188963ec HZ |
1122 | struct vmbus_channel_msginfo *msginfo; |
1123 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1124 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1125 | unsigned long flags; |
3e7ee490 | 1126 | |
188963ec | 1127 | version_response = (struct vmbus_channel_version_response *)hdr; |
c7924fb0 VK |
1128 | |
1129 | trace_vmbus_onversion_response(version_response); | |
1130 | ||
15b2f647 | 1131 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1132 | |
ebb61e5f HJ |
1133 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1134 | msglistentry) { | |
188963ec | 1135 | requestheader = |
c50f7fb2 | 1136 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1137 | |
c50f7fb2 HZ |
1138 | if (requestheader->msgtype == |
1139 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1140 | memcpy(&msginfo->response.version_response, |
188963ec | 1141 | version_response, |
bd60c33e | 1142 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1143 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1144 | } |
1145 | } | |
15b2f647 | 1146 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1147 | } |
1148 | ||
c8212f04 | 1149 | /* Channel message dispatch table */ |
e6242fa0 SH |
1150 | const struct vmbus_channel_message_table_entry |
1151 | channel_message_table[CHANNELMSG_COUNT] = { | |
1152 | { CHANNELMSG_INVALID, 0, NULL }, | |
1153 | { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, | |
1154 | { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, | |
1155 | { CHANNELMSG_REQUESTOFFERS, 0, NULL }, | |
1156 | { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, | |
1157 | { CHANNELMSG_OPENCHANNEL, 0, NULL }, | |
1158 | { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, | |
1159 | { CHANNELMSG_CLOSECHANNEL, 0, NULL }, | |
1160 | { CHANNELMSG_GPADL_HEADER, 0, NULL }, | |
1161 | { CHANNELMSG_GPADL_BODY, 0, NULL }, | |
1162 | { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, | |
1163 | { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, | |
1164 | { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, | |
1165 | { CHANNELMSG_RELID_RELEASED, 0, NULL }, | |
1166 | { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, | |
1167 | { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, | |
1168 | { CHANNELMSG_UNLOAD, 0, NULL }, | |
1169 | { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, | |
1170 | { CHANNELMSG_18, 0, NULL }, | |
1171 | { CHANNELMSG_19, 0, NULL }, | |
1172 | { CHANNELMSG_20, 0, NULL }, | |
1173 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | |
c8212f04 GKH |
1174 | }; |
1175 | ||
3e189519 | 1176 | /* |
e98cb276 | 1177 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1178 | * |
1179 | * This is invoked in the vmbus worker thread context. | |
1180 | */ | |
e98cb276 | 1181 | void vmbus_onmessage(void *context) |
3e7ee490 | 1182 | { |
188963ec | 1183 | struct hv_message *msg = context; |
82250213 | 1184 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1185 | int size; |
1186 | ||
f6feebe0 HZ |
1187 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1188 | size = msg->header.payload_size; | |
3e7ee490 | 1189 | |
716fa52f VK |
1190 | trace_vmbus_on_message(hdr); |
1191 | ||
c50f7fb2 | 1192 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1193 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1194 | hdr->msgtype, size); |
04f50c4d | 1195 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1196 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1197 | return; |
1198 | } | |
1199 | ||
b7c6b02f S |
1200 | if (channel_message_table[hdr->msgtype].message_handler) |
1201 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1202 | else |
0a46618d | 1203 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1204 | } |
1205 | ||
3e189519 | 1206 | /* |
e98cb276 | 1207 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1208 | */ |
e98cb276 | 1209 | int vmbus_request_offers(void) |
3e7ee490 | 1210 | { |
82250213 | 1211 | struct vmbus_channel_message_header *msg; |
188963ec | 1212 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1213 | int ret; |
3e7ee490 | 1214 | |
188963ec | 1215 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1216 | sizeof(struct vmbus_channel_message_header), |
1217 | GFP_KERNEL); | |
188963ec | 1218 | if (!msginfo) |
75910f23 | 1219 | return -ENOMEM; |
3e7ee490 | 1220 | |
c50f7fb2 | 1221 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1222 | |
c50f7fb2 | 1223 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1224 | |
c0bb0392 VK |
1225 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), |
1226 | true); | |
d6706e63 VK |
1227 | |
1228 | trace_vmbus_request_offers(ret); | |
1229 | ||
bd60c33e | 1230 | if (ret != 0) { |
0a46618d | 1231 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1232 | |
0c3b7b2f S |
1233 | goto cleanup; |
1234 | } | |
3e7ee490 | 1235 | |
0c3b7b2f | 1236 | cleanup: |
dd9b15dc | 1237 | kfree(msginfo); |
3e7ee490 | 1238 | |
3e7ee490 HJ |
1239 | return ret; |
1240 | } | |
1241 | ||
e68d2971 S |
1242 | /* |
1243 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
1244 | * When a primary channel has multiple sub-channels, we try to |
1245 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
1246 | */ |
1247 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
1248 | { | |
1249 | struct list_head *cur, *tmp; | |
87712bf8 | 1250 | int cur_cpu; |
e68d2971 S |
1251 | struct vmbus_channel *cur_channel; |
1252 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
1253 | int next_channel; |
1254 | int i = 1; | |
e68d2971 S |
1255 | |
1256 | if (list_empty(&primary->sc_list)) | |
1257 | return outgoing_channel; | |
1258 | ||
a13e8bbe S |
1259 | next_channel = primary->next_oc++; |
1260 | ||
1261 | if (next_channel > (primary->num_sc)) { | |
1262 | primary->next_oc = 0; | |
1263 | return outgoing_channel; | |
1264 | } | |
1265 | ||
7415aea6 | 1266 | cur_cpu = hv_cpu_number_to_vp_number(smp_processor_id()); |
e68d2971 S |
1267 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
1268 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1269 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
1270 | continue; | |
1271 | ||
1272 | if (cur_channel->target_vp == cur_cpu) | |
1273 | return cur_channel; | |
1274 | ||
a13e8bbe S |
1275 | if (i == next_channel) |
1276 | return cur_channel; | |
e68d2971 | 1277 | |
a13e8bbe | 1278 | i++; |
e68d2971 S |
1279 | } |
1280 | ||
1281 | return outgoing_channel; | |
1282 | } | |
1283 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
1284 | ||
1285 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
1286 | { | |
1287 | struct list_head *cur, *tmp; | |
1288 | struct vmbus_channel *cur_channel; | |
1289 | ||
1290 | if (primary_channel->sc_creation_callback == NULL) | |
1291 | return; | |
1292 | ||
1293 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1294 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1295 | ||
1296 | primary_channel->sc_creation_callback(cur_channel); | |
1297 | } | |
1298 | } | |
1299 | ||
1300 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1301 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1302 | { | |
1303 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1304 | } | |
1305 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1306 | ||
1307 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1308 | { | |
1309 | bool ret; | |
1310 | ||
1311 | ret = !list_empty(&primary->sc_list); | |
1312 | ||
1313 | if (ret) { | |
1314 | /* | |
1315 | * Invoke the callback on sub-channel creation. | |
1316 | * This will present a uniform interface to the | |
1317 | * clients. | |
1318 | */ | |
1319 | invoke_sc_cb(primary); | |
1320 | } | |
1321 | ||
1322 | return ret; | |
1323 | } | |
1324 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1325 | |
1326 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1327 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1328 | { | |
1329 | channel->chn_rescind_callback = chn_rescind_cb; | |
1330 | } | |
1331 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |