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 | 143 | static const struct { |
593db803 | 144 | guid_t guid; |
0f98829a DC |
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 | ||
593db803 | 174 | static bool is_unsupported_vmbus_devs(const guid_t *guid) |
0f98829a DC |
175 | { |
176 | int i; | |
177 | ||
178 | for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++) | |
593db803 | 179 | if (guid_equal(guid, &vmbus_unsupported_devs[i].guid)) |
0f98829a DC |
180 | return true; |
181 | return false; | |
182 | } | |
183 | ||
184 | static u16 hv_get_dev_type(const struct vmbus_channel *channel) | |
7047f17d | 185 | { |
593db803 | 186 | const guid_t *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++) { |
593db803 | 193 | if (guid_equal(guid, &vmbus_devs[i].guid)) |
7047f17d S |
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); |
67fae053 | 408 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 409 | } |
ca1c4b74 DC |
410 | |
411 | /* | |
412 | * We need to free the bit for init_vp_index() to work in the case | |
413 | * of sub-channel, when we reload drivers like hv_netvsc. | |
414 | */ | |
509879bd S |
415 | if (channel->affinity_policy == HV_LOCALIZED) |
416 | cpumask_clear_cpu(channel->target_cpu, | |
417 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 418 | |
800b9329 | 419 | vmbus_release_relid(channel->offermsg.child_relid); |
638fea33 | 420 | |
c8705979 | 421 | free_channel(channel); |
4b2f9abe | 422 | } |
8b5d6d3b | 423 | |
93e5bd06 S |
424 | void vmbus_free_channels(void) |
425 | { | |
813c5b79 DC |
426 | struct vmbus_channel *channel, *tmp; |
427 | ||
428 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
429 | listentry) { | |
34c6801e | 430 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 431 | channel->rescind = true; |
93e5bd06 | 432 | |
93e5bd06 | 433 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
434 | } |
435 | } | |
436 | ||
37c2578c DC |
437 | /* Note: the function can run concurrently for primary/sub channels. */ |
438 | static void vmbus_add_channel_work(struct work_struct *work) | |
3e7ee490 | 439 | { |
37c2578c DC |
440 | struct vmbus_channel *newchannel = |
441 | container_of(work, struct vmbus_channel, add_channel_work); | |
442 | struct vmbus_channel *primary_channel = newchannel->primary_channel; | |
0f5e44ca | 443 | unsigned long flags; |
7047f17d | 444 | u16 dev_type; |
85d9aa70 | 445 | int ret; |
3e7ee490 | 446 | |
0f98829a | 447 | dev_type = hv_get_dev_type(newchannel); |
7047f17d S |
448 | |
449 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 450 | |
8dfd3326 VK |
451 | if (newchannel->target_cpu != get_cpu()) { |
452 | put_cpu(); | |
453 | smp_call_function_single(newchannel->target_cpu, | |
454 | percpu_channel_enq, | |
455 | newchannel, true); | |
456 | } else { | |
457 | percpu_channel_enq(newchannel); | |
458 | put_cpu(); | |
3e7ee490 HJ |
459 | } |
460 | ||
42dceebe S |
461 | /* |
462 | * This state is used to indicate a successful open | |
463 | * so that when we do close the channel normally, we | |
37c2578c | 464 | * can cleanup properly. |
42dceebe S |
465 | */ |
466 | newchannel->state = CHANNEL_OPEN_STATE; | |
467 | ||
37c2578c DC |
468 | if (primary_channel != NULL) { |
469 | /* newchannel is a sub-channel. */ | |
470 | struct hv_device *dev = primary_channel->device_obj; | |
c2e5df61 | 471 | |
50229128 | 472 | if (vmbus_add_channel_kobj(dev, newchannel)) |
37c2578c DC |
473 | goto err_deq_chan; |
474 | ||
475 | if (primary_channel->sc_creation_callback != NULL) | |
476 | primary_channel->sc_creation_callback(newchannel); | |
c2e5df61 | 477 | |
192b2d78 | 478 | newchannel->probe_done = true; |
8dfd3326 VK |
479 | return; |
480 | } | |
481 | ||
bd60c33e | 482 | /* |
37c2578c | 483 | * Start the process of binding the primary channel to the driver |
bd60c33e | 484 | */ |
f2c73011 | 485 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
486 | &newchannel->offermsg.offer.if_type, |
487 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 488 | newchannel); |
9c3a6f7e | 489 | if (!newchannel->device_obj) |
5b1e5b53 | 490 | goto err_deq_chan; |
3e7ee490 | 491 | |
7047f17d | 492 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
493 | /* |
494 | * Add the new device to the bus. This will kick off device-driver | |
495 | * binding which eventually invokes the device driver's AddDevice() | |
496 | * method. | |
497 | */ | |
85d9aa70 | 498 | ret = vmbus_device_register(newchannel->device_obj); |
85d9aa70 DC |
499 | |
500 | if (ret != 0) { | |
d43e2fe7 DC |
501 | pr_err("unable to add child device object (relid %d)\n", |
502 | newchannel->offermsg.child_relid); | |
503 | kfree(newchannel->device_obj); | |
504 | goto err_deq_chan; | |
505 | } | |
54a66265 | 506 | |
6f3d791f | 507 | newchannel->probe_done = true; |
9c3a6f7e | 508 | return; |
2dd37cb8 | 509 | |
5b1e5b53 | 510 | err_deq_chan: |
d6f591e3 | 511 | mutex_lock(&vmbus_connection.channel_mutex); |
37c2578c DC |
512 | |
513 | /* | |
514 | * We need to set the flag, otherwise | |
515 | * vmbus_onoffer_rescind() can be blocked. | |
516 | */ | |
517 | newchannel->probe_done = true; | |
518 | ||
519 | if (primary_channel == NULL) { | |
520 | list_del(&newchannel->listentry); | |
521 | } else { | |
522 | spin_lock_irqsave(&primary_channel->lock, flags); | |
523 | list_del(&newchannel->sc_list); | |
524 | spin_unlock_irqrestore(&primary_channel->lock, flags); | |
525 | } | |
526 | ||
d6f591e3 | 527 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
528 | |
529 | if (newchannel->target_cpu != get_cpu()) { | |
530 | put_cpu(); | |
531 | smp_call_function_single(newchannel->target_cpu, | |
37c2578c DC |
532 | percpu_channel_deq, |
533 | newchannel, true); | |
5b1e5b53 S |
534 | } else { |
535 | percpu_channel_deq(newchannel); | |
536 | put_cpu(); | |
537 | } | |
638fea33 DC |
538 | |
539 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 540 | |
9c3a6f7e | 541 | free_channel(newchannel); |
3e7ee490 HJ |
542 | } |
543 | ||
37c2578c DC |
544 | /* |
545 | * vmbus_process_offer - Process the offer by creating a channel/device | |
546 | * associated with this offer | |
547 | */ | |
548 | static void vmbus_process_offer(struct vmbus_channel *newchannel) | |
549 | { | |
550 | struct vmbus_channel *channel; | |
551 | struct workqueue_struct *wq; | |
552 | unsigned long flags; | |
553 | bool fnew = true; | |
554 | ||
555 | mutex_lock(&vmbus_connection.channel_mutex); | |
556 | ||
557 | /* | |
558 | * Now that we have acquired the channel_mutex, | |
559 | * we can release the potentially racing rescind thread. | |
560 | */ | |
561 | atomic_dec(&vmbus_connection.offer_in_progress); | |
562 | ||
563 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
593db803 AS |
564 | if (guid_equal(&channel->offermsg.offer.if_type, |
565 | &newchannel->offermsg.offer.if_type) && | |
566 | guid_equal(&channel->offermsg.offer.if_instance, | |
567 | &newchannel->offermsg.offer.if_instance)) { | |
37c2578c DC |
568 | fnew = false; |
569 | break; | |
570 | } | |
571 | } | |
572 | ||
573 | if (fnew) | |
574 | list_add_tail(&newchannel->listentry, | |
575 | &vmbus_connection.chn_list); | |
576 | else { | |
577 | /* | |
578 | * Check to see if this is a valid sub-channel. | |
579 | */ | |
580 | if (newchannel->offermsg.offer.sub_channel_index == 0) { | |
581 | mutex_unlock(&vmbus_connection.channel_mutex); | |
582 | /* | |
583 | * Don't call free_channel(), because newchannel->kobj | |
584 | * is not initialized yet. | |
585 | */ | |
586 | kfree(newchannel); | |
587 | WARN_ON_ONCE(1); | |
588 | return; | |
589 | } | |
590 | /* | |
591 | * Process the sub-channel. | |
592 | */ | |
593 | newchannel->primary_channel = channel; | |
594 | spin_lock_irqsave(&channel->lock, flags); | |
595 | list_add_tail(&newchannel->sc_list, &channel->sc_list); | |
596 | spin_unlock_irqrestore(&channel->lock, flags); | |
597 | } | |
598 | ||
599 | mutex_unlock(&vmbus_connection.channel_mutex); | |
600 | ||
601 | /* | |
602 | * vmbus_process_offer() mustn't call channel->sc_creation_callback() | |
603 | * directly for sub-channels, because sc_creation_callback() -> | |
604 | * vmbus_open() may never get the host's response to the | |
605 | * OPEN_CHANNEL message (the host may rescind a channel at any time, | |
606 | * e.g. in the case of hot removing a NIC), and vmbus_onoffer_rescind() | |
607 | * may not wake up the vmbus_open() as it's blocked due to a non-zero | |
608 | * vmbus_connection.offer_in_progress, and finally we have a deadlock. | |
609 | * | |
610 | * The above is also true for primary channels, if the related device | |
611 | * drivers use sync probing mode by default. | |
612 | * | |
613 | * And, usually the handling of primary channels and sub-channels can | |
614 | * depend on each other, so we should offload them to different | |
615 | * workqueues to avoid possible deadlock, e.g. in sync-probing mode, | |
616 | * NIC1's netvsc_subchan_work() can race with NIC2's netvsc_probe() -> | |
617 | * rtnl_lock(), and causes deadlock: the former gets the rtnl_lock | |
618 | * and waits for all the sub-channels to appear, but the latter | |
619 | * can't get the rtnl_lock and this blocks the handling of | |
620 | * sub-channels. | |
621 | */ | |
622 | INIT_WORK(&newchannel->add_channel_work, vmbus_add_channel_work); | |
623 | wq = fnew ? vmbus_connection.handle_primary_chan_wq : | |
624 | vmbus_connection.handle_sub_chan_wq; | |
625 | queue_work(wq, &newchannel->add_channel_work); | |
626 | } | |
627 | ||
a119845f S |
628 | /* |
629 | * We use this state to statically distribute the channel interrupt load. | |
630 | */ | |
1f656ff3 | 631 | static int next_numa_node_id; |
37c2578c DC |
632 | /* |
633 | * init_vp_index() accesses global variables like next_numa_node_id, and | |
634 | * it can run concurrently for primary channels and sub-channels: see | |
635 | * vmbus_process_offer(), so we need the lock to protect the global | |
636 | * variables. | |
637 | */ | |
638 | static DEFINE_SPINLOCK(bind_channel_to_cpu_lock); | |
a119845f S |
639 | |
640 | /* | |
641 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 | 642 | * channel interrupt load by binding a channel to VCPU. |
ce767047 HZ |
643 | * We distribute the interrupt loads to one or more NUMA nodes based on |
644 | * the channel's affinity_policy. | |
1f656ff3 S |
645 | * |
646 | * For pre-win8 hosts or non-performance critical channels we assign the | |
647 | * first CPU in the first NUMA node. | |
a119845f | 648 | */ |
7047f17d | 649 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
650 | { |
651 | u32 cur_cpu; | |
7047f17d | 652 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
653 | struct vmbus_channel *primary = channel->primary_channel; |
654 | int next_node; | |
25355252 | 655 | cpumask_var_t available_mask; |
9f01ec53 | 656 | struct cpumask *alloced_mask; |
a119845f | 657 | |
a119845f | 658 | if ((vmbus_proto_version == VERSION_WS2008) || |
25355252 DC |
659 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || |
660 | !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { | |
a119845f S |
661 | /* |
662 | * Prior to win8, all channel interrupts are | |
663 | * delivered on cpu 0. | |
664 | * Also if the channel is not a performance critical | |
665 | * channel, bind it to cpu 0. | |
25355252 | 666 | * In case alloc_cpumask_var() fails, bind it to cpu 0. |
a119845f | 667 | */ |
1f656ff3 | 668 | channel->numa_node = 0; |
d3ba720d | 669 | channel->target_cpu = 0; |
7415aea6 | 670 | channel->target_vp = hv_cpu_number_to_vp_number(0); |
d3ba720d | 671 | return; |
a119845f | 672 | } |
ce59fec8 | 673 | |
37c2578c DC |
674 | spin_lock(&bind_channel_to_cpu_lock); |
675 | ||
ce59fec8 | 676 | /* |
509879bd S |
677 | * Based on the channel affinity policy, we will assign the NUMA |
678 | * nodes. | |
ce59fec8 | 679 | */ |
509879bd S |
680 | |
681 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
682 | while (true) { |
683 | next_node = next_numa_node_id++; | |
509879bd | 684 | if (next_node == nr_node_ids) { |
1f656ff3 | 685 | next_node = next_numa_node_id = 0; |
509879bd S |
686 | continue; |
687 | } | |
1f656ff3 S |
688 | if (cpumask_empty(cpumask_of_node(next_node))) |
689 | continue; | |
690 | break; | |
691 | } | |
692 | channel->numa_node = next_node; | |
693 | primary = channel; | |
694 | } | |
9f01ec53 | 695 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 696 | |
9f01ec53 | 697 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 698 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 699 | /* |
1f656ff3 S |
700 | * We have cycled through all the CPUs in the node; |
701 | * reset the alloced map. | |
ce59fec8 | 702 | */ |
9f01ec53 | 703 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
704 | } |
705 | ||
25355252 | 706 | cpumask_xor(available_mask, alloced_mask, |
1f656ff3 S |
707 | cpumask_of_node(primary->numa_node)); |
708 | ||
3b71107d | 709 | cur_cpu = -1; |
79fd8e70 | 710 | |
509879bd S |
711 | if (primary->affinity_policy == HV_LOCALIZED) { |
712 | /* | |
713 | * Normally Hyper-V host doesn't create more subchannels | |
714 | * than there are VCPUs on the node but it is possible when not | |
715 | * all present VCPUs on the node are initialized by guest. | |
716 | * Clear the alloced_cpus_in_node to start over. | |
717 | */ | |
718 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
719 | cpumask_of_node(primary->numa_node))) | |
720 | cpumask_clear(&primary->alloced_cpus_in_node); | |
721 | } | |
79fd8e70 | 722 | |
3b71107d | 723 | while (true) { |
25355252 | 724 | cur_cpu = cpumask_next(cur_cpu, available_mask); |
3b71107d DC |
725 | if (cur_cpu >= nr_cpu_ids) { |
726 | cur_cpu = -1; | |
25355252 | 727 | cpumask_copy(available_mask, |
3b71107d DC |
728 | cpumask_of_node(primary->numa_node)); |
729 | continue; | |
730 | } | |
731 | ||
509879bd S |
732 | if (primary->affinity_policy == HV_LOCALIZED) { |
733 | /* | |
734 | * NOTE: in the case of sub-channel, we clear the | |
735 | * sub-channel related bit(s) in | |
736 | * primary->alloced_cpus_in_node in | |
737 | * hv_process_channel_removal(), so when we | |
738 | * reload drivers like hv_netvsc in SMP guest, here | |
739 | * we're able to re-allocate | |
740 | * bit from primary->alloced_cpus_in_node. | |
741 | */ | |
742 | if (!cpumask_test_cpu(cur_cpu, | |
743 | &primary->alloced_cpus_in_node)) { | |
744 | cpumask_set_cpu(cur_cpu, | |
745 | &primary->alloced_cpus_in_node); | |
746 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
747 | break; | |
748 | } | |
749 | } else { | |
3b71107d DC |
750 | cpumask_set_cpu(cur_cpu, alloced_mask); |
751 | break; | |
752 | } | |
753 | } | |
1f656ff3 | 754 | |
d3ba720d | 755 | channel->target_cpu = cur_cpu; |
7415aea6 | 756 | channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); |
25355252 | 757 | |
37c2578c DC |
758 | spin_unlock(&bind_channel_to_cpu_lock); |
759 | ||
25355252 | 760 | free_cpumask_var(available_mask); |
a119845f S |
761 | } |
762 | ||
41571916 VK |
763 | static void vmbus_wait_for_unload(void) |
764 | { | |
cd95aad5 VK |
765 | int cpu; |
766 | void *page_addr; | |
767 | struct hv_message *msg; | |
41571916 | 768 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 769 | u32 message_type; |
41571916 | 770 | |
cd95aad5 VK |
771 | /* |
772 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
773 | * used for initial contact or to CPU0 depending on host version. When | |
774 | * we're crashing on a different CPU let's hope that IRQ handler on | |
775 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
776 | * functional and vmbus_unload_response() will complete | |
777 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
778 | * read message pages for all CPUs directly. | |
779 | */ | |
41571916 | 780 | while (1) { |
cd95aad5 VK |
781 | if (completion_done(&vmbus_connection.unload_event)) |
782 | break; | |
41571916 | 783 | |
cd95aad5 | 784 | for_each_online_cpu(cpu) { |
37cdd991 SH |
785 | struct hv_per_cpu_context *hv_cpu |
786 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
787 | ||
788 | page_addr = hv_cpu->synic_message_page; | |
789 | msg = (struct hv_message *)page_addr | |
790 | + VMBUS_MESSAGE_SINT; | |
41571916 | 791 | |
cd95aad5 VK |
792 | message_type = READ_ONCE(msg->header.message_type); |
793 | if (message_type == HVMSG_NONE) | |
794 | continue; | |
41571916 | 795 | |
cd95aad5 VK |
796 | hdr = (struct vmbus_channel_message_header *) |
797 | msg->u.payload; | |
798 | ||
799 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
800 | complete(&vmbus_connection.unload_event); | |
801 | ||
802 | vmbus_signal_eom(msg, message_type); | |
803 | } | |
804 | ||
805 | mdelay(10); | |
806 | } | |
807 | ||
808 | /* | |
809 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
810 | * maybe-pending messages on all CPUs to be able to receive new | |
811 | * messages after we reconnect. | |
812 | */ | |
813 | for_each_online_cpu(cpu) { | |
37cdd991 SH |
814 | struct hv_per_cpu_context *hv_cpu |
815 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
816 | ||
817 | page_addr = hv_cpu->synic_message_page; | |
cd95aad5 VK |
818 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
819 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
820 | } |
821 | } | |
822 | ||
2db84eff S |
823 | /* |
824 | * vmbus_unload_response - Handler for the unload response. | |
825 | */ | |
826 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
827 | { | |
828 | /* | |
829 | * This is a global event; just wakeup the waiting thread. | |
830 | * Once we successfully unload, we can cleanup the monitor state. | |
831 | */ | |
832 | complete(&vmbus_connection.unload_event); | |
833 | } | |
834 | ||
75ff3a8a | 835 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
836 | { |
837 | struct vmbus_channel_message_header hdr; | |
838 | ||
4a54243f VK |
839 | /* Pre-Win2012R2 hosts don't support reconnect */ |
840 | if (vmbus_proto_version < VERSION_WIN8_1) | |
841 | return; | |
842 | ||
2db84eff S |
843 | init_completion(&vmbus_connection.unload_event); |
844 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
845 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
c0bb0392 VK |
846 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), |
847 | !crash); | |
2db84eff | 848 | |
41571916 VK |
849 | /* |
850 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
851 | * happening in an interrupt context, where scheduling is impossible. | |
852 | */ | |
75ff3a8a | 853 | if (!crash) |
41571916 VK |
854 | wait_for_completion(&vmbus_connection.unload_event); |
855 | else | |
856 | vmbus_wait_for_unload(); | |
2db84eff S |
857 | } |
858 | ||
3e189519 | 859 | /* |
e98cb276 | 860 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 861 | * |
bd60c33e | 862 | */ |
e98cb276 | 863 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 864 | { |
bd60c33e | 865 | struct vmbus_channel_offer_channel *offer; |
188963ec | 866 | struct vmbus_channel *newchannel; |
3e7ee490 | 867 | |
bd60c33e | 868 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 869 | |
03b81e66 VK |
870 | trace_vmbus_onoffer(offer); |
871 | ||
454f18a9 | 872 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 873 | newchannel = alloc_channel(); |
188963ec | 874 | if (!newchannel) { |
9a547602 | 875 | vmbus_release_relid(offer->child_relid); |
54a66265 | 876 | atomic_dec(&vmbus_connection.offer_in_progress); |
0a46618d | 877 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
878 | return; |
879 | } | |
880 | ||
b3bf60c7 S |
881 | /* |
882 | * Setup state for signalling the host. | |
883 | */ | |
05784171 | 884 | newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID; |
b3bf60c7 S |
885 | |
886 | if (vmbus_proto_version != VERSION_WS2008) { | |
887 | newchannel->is_dedicated_interrupt = | |
888 | (offer->is_dedicated_interrupt != 0); | |
05784171 | 889 | newchannel->sig_event = offer->connection_id; |
b3bf60c7 S |
890 | } |
891 | ||
c50f7fb2 | 892 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 893 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
894 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
895 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 896 | |
2dd37cb8 | 897 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
898 | } |
899 | ||
3e189519 | 900 | /* |
e98cb276 | 901 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
902 | * |
903 | * We queue a work item to process this offer synchronously | |
904 | */ | |
e98cb276 | 905 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 906 | { |
bd60c33e | 907 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 908 | struct vmbus_channel *channel; |
d43e2fe7 | 909 | struct device *dev; |
3e7ee490 | 910 | |
bd60c33e | 911 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 | 912 | |
5175167c VK |
913 | trace_vmbus_onoffer_rescind(rescind); |
914 | ||
54a66265 S |
915 | /* |
916 | * The offer msg and the corresponding rescind msg | |
917 | * from the host are guranteed to be ordered - | |
918 | * offer comes in first and then the rescind. | |
919 | * Since we process these events in work elements, | |
920 | * and with preemption, we may end up processing | |
921 | * the events out of order. Given that we handle these | |
922 | * work elements on the same CPU, this is possible only | |
923 | * in the case of preemption. In any case wait here | |
924 | * until the offer processing has moved beyond the | |
925 | * point where the channel is discoverable. | |
926 | */ | |
927 | ||
928 | while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { | |
929 | /* | |
930 | * We wait here until any channel offer is currently | |
931 | * being processed. | |
932 | */ | |
933 | msleep(1); | |
934 | } | |
935 | ||
85d9aa70 | 936 | mutex_lock(&vmbus_connection.channel_mutex); |
d43e2fe7 | 937 | channel = relid2channel(rescind->child_relid); |
54a66265 | 938 | mutex_unlock(&vmbus_connection.channel_mutex); |
98e08702 | 939 | |
2dd37cb8 | 940 | if (channel == NULL) { |
f52078cf | 941 | /* |
54a66265 S |
942 | * We failed in processing the offer message; |
943 | * we would have cleaned up the relid in that | |
944 | * failure path. | |
f52078cf | 945 | */ |
54a66265 | 946 | return; |
2dd37cb8 | 947 | } |
3e7ee490 | 948 | |
d3b26dd7 DC |
949 | /* |
950 | * Before setting channel->rescind in vmbus_rescind_cleanup(), we | |
951 | * should make sure the channel callback is not running any more. | |
952 | */ | |
953 | vmbus_reset_channel_cb(channel); | |
954 | ||
6f3d791f S |
955 | /* |
956 | * Now wait for offer handling to complete. | |
957 | */ | |
7fa32e5e | 958 | vmbus_rescind_cleanup(channel); |
6f3d791f S |
959 | while (READ_ONCE(channel->probe_done) == false) { |
960 | /* | |
961 | * We wait here until any channel offer is currently | |
962 | * being processed. | |
963 | */ | |
964 | msleep(1); | |
965 | } | |
966 | ||
967 | /* | |
968 | * At this point, the rescind handling can proceed safely. | |
969 | */ | |
970 | ||
d43e2fe7 | 971 | if (channel->device_obj) { |
499e8401 DC |
972 | if (channel->chn_rescind_callback) { |
973 | channel->chn_rescind_callback(channel); | |
54a66265 | 974 | return; |
499e8401 | 975 | } |
d43e2fe7 DC |
976 | /* |
977 | * We will have to unregister this device from the | |
978 | * driver core. | |
979 | */ | |
980 | dev = get_device(&channel->device_obj->device); | |
981 | if (dev) { | |
982 | vmbus_device_unregister(channel->device_obj); | |
983 | put_device(dev); | |
984 | } | |
2dd37cb8 | 985 | } |
54a66265 S |
986 | if (channel->primary_channel != NULL) { |
987 | /* | |
988 | * Sub-channel is being rescinded. Following is the channel | |
989 | * close sequence when initiated from the driveri (refer to | |
990 | * vmbus_close() for details): | |
991 | * 1. Close all sub-channels first | |
992 | * 2. Then close the primary channel. | |
993 | */ | |
192b2d78 | 994 | mutex_lock(&vmbus_connection.channel_mutex); |
54a66265 S |
995 | if (channel->state == CHANNEL_OPEN_STATE) { |
996 | /* | |
997 | * The channel is currently not open; | |
998 | * it is safe for us to cleanup the channel. | |
999 | */ | |
800b9329 | 1000 | hv_process_channel_removal(channel); |
7fa32e5e S |
1001 | } else { |
1002 | complete(&channel->rescind_event); | |
54a66265 | 1003 | } |
192b2d78 | 1004 | mutex_unlock(&vmbus_connection.channel_mutex); |
54a66265 | 1005 | } |
85d9aa70 DC |
1006 | } |
1007 | ||
1008 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
1009 | { | |
85d9aa70 DC |
1010 | BUG_ON(!is_hvsock_channel(channel)); |
1011 | ||
9d35593b DC |
1012 | /* We always get a rescind msg when a connection is closed. */ |
1013 | while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind)) | |
1014 | msleep(1); | |
1015 | ||
85d9aa70 | 1016 | vmbus_device_unregister(channel->device_obj); |
3e7ee490 | 1017 | } |
85d9aa70 DC |
1018 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
1019 | ||
3e7ee490 | 1020 | |
3e189519 | 1021 | /* |
e98cb276 HZ |
1022 | * vmbus_onoffers_delivered - |
1023 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
1024 | * |
1025 | * Nothing to do here. | |
1026 | */ | |
e98cb276 | 1027 | static void vmbus_onoffers_delivered( |
bd60c33e | 1028 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1029 | { |
3e7ee490 HJ |
1030 | } |
1031 | ||
3e189519 | 1032 | /* |
e98cb276 | 1033 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
1034 | * |
1035 | * This is invoked when we received a response to our channel open request. | |
1036 | * Find the matching request, copy the response and signal the requesting | |
1037 | * thread. | |
1038 | */ | |
e98cb276 | 1039 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1040 | { |
bd60c33e | 1041 | struct vmbus_channel_open_result *result; |
188963ec HZ |
1042 | struct vmbus_channel_msginfo *msginfo; |
1043 | struct vmbus_channel_message_header *requestheader; | |
1044 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 1045 | unsigned long flags; |
3e7ee490 | 1046 | |
bd60c33e | 1047 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 1048 | |
9f23ce1a VK |
1049 | trace_vmbus_onopen_result(result); |
1050 | ||
bd60c33e GKH |
1051 | /* |
1052 | * Find the open msg, copy the result and signal/unblock the wait event | |
1053 | */ | |
15b2f647 | 1054 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1055 | |
ebb61e5f HJ |
1056 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1057 | msglistentry) { | |
188963ec | 1058 | requestheader = |
c50f7fb2 | 1059 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1060 | |
c50f7fb2 | 1061 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 1062 | openmsg = |
c50f7fb2 HZ |
1063 | (struct vmbus_channel_open_channel *)msginfo->msg; |
1064 | if (openmsg->child_relid == result->child_relid && | |
1065 | openmsg->openid == result->openid) { | |
1066 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 1067 | result, |
9568a193 S |
1068 | sizeof( |
1069 | struct vmbus_channel_open_result)); | |
1070 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1071 | break; |
1072 | } | |
1073 | } | |
1074 | } | |
15b2f647 | 1075 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1076 | } |
1077 | ||
3e189519 | 1078 | /* |
e98cb276 | 1079 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
1080 | * |
1081 | * This is invoked when we received a response to our gpadl create request. | |
1082 | * Find the matching request, copy the response and signal the requesting | |
1083 | * thread. | |
1084 | */ | |
e98cb276 | 1085 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1086 | { |
188963ec | 1087 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
1088 | struct vmbus_channel_msginfo *msginfo; |
1089 | struct vmbus_channel_message_header *requestheader; | |
1090 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 1091 | unsigned long flags; |
3e7ee490 | 1092 | |
188963ec | 1093 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 1094 | |
a13bf0ea VK |
1095 | trace_vmbus_ongpadl_created(gpadlcreated); |
1096 | ||
bd60c33e GKH |
1097 | /* |
1098 | * Find the establish msg, copy the result and signal/unblock the wait | |
1099 | * event | |
1100 | */ | |
15b2f647 | 1101 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1102 | |
ebb61e5f HJ |
1103 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1104 | msglistentry) { | |
188963ec | 1105 | requestheader = |
c50f7fb2 | 1106 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1107 | |
c50f7fb2 | 1108 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
1109 | gpadlheader = |
1110 | (struct vmbus_channel_gpadl_header *)requestheader; | |
1111 | ||
c50f7fb2 HZ |
1112 | if ((gpadlcreated->child_relid == |
1113 | gpadlheader->child_relid) && | |
1114 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
1115 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 1116 | gpadlcreated, |
9568a193 S |
1117 | sizeof( |
1118 | struct vmbus_channel_gpadl_created)); | |
1119 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1120 | break; |
1121 | } | |
1122 | } | |
1123 | } | |
15b2f647 | 1124 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1125 | } |
1126 | ||
3e189519 | 1127 | /* |
e98cb276 | 1128 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
1129 | * |
1130 | * This is invoked when we received a response to our gpadl teardown request. | |
1131 | * Find the matching request, copy the response and signal the requesting | |
1132 | * thread. | |
1133 | */ | |
e98cb276 | 1134 | static void vmbus_ongpadl_torndown( |
bd60c33e | 1135 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1136 | { |
188963ec | 1137 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
1138 | struct vmbus_channel_msginfo *msginfo; |
1139 | struct vmbus_channel_message_header *requestheader; | |
1140 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 1141 | unsigned long flags; |
3e7ee490 | 1142 | |
188963ec | 1143 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e | 1144 | |
602a8c52 VK |
1145 | trace_vmbus_ongpadl_torndown(gpadl_torndown); |
1146 | ||
bd60c33e GKH |
1147 | /* |
1148 | * Find the open msg, copy the result and signal/unblock the wait event | |
1149 | */ | |
15b2f647 | 1150 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1151 | |
ebb61e5f HJ |
1152 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1153 | msglistentry) { | |
188963ec | 1154 | requestheader = |
c50f7fb2 | 1155 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1156 | |
c50f7fb2 | 1157 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
1158 | gpadl_teardown = |
1159 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 1160 | |
c50f7fb2 HZ |
1161 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
1162 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 1163 | gpadl_torndown, |
9568a193 S |
1164 | sizeof( |
1165 | struct vmbus_channel_gpadl_torndown)); | |
1166 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1167 | break; |
1168 | } | |
1169 | } | |
1170 | } | |
15b2f647 | 1171 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1172 | } |
1173 | ||
3e189519 | 1174 | /* |
e98cb276 | 1175 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1176 | * |
1177 | * This is invoked when we received a response to our initiate contact request. | |
1178 | * Find the matching request, copy the response and signal the requesting | |
1179 | * thread. | |
1180 | */ | |
e98cb276 | 1181 | static void vmbus_onversion_response( |
bd60c33e | 1182 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1183 | { |
188963ec HZ |
1184 | struct vmbus_channel_msginfo *msginfo; |
1185 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1186 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1187 | unsigned long flags; |
3e7ee490 | 1188 | |
188963ec | 1189 | version_response = (struct vmbus_channel_version_response *)hdr; |
c7924fb0 VK |
1190 | |
1191 | trace_vmbus_onversion_response(version_response); | |
1192 | ||
15b2f647 | 1193 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1194 | |
ebb61e5f HJ |
1195 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1196 | msglistentry) { | |
188963ec | 1197 | requestheader = |
c50f7fb2 | 1198 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1199 | |
c50f7fb2 HZ |
1200 | if (requestheader->msgtype == |
1201 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1202 | memcpy(&msginfo->response.version_response, |
188963ec | 1203 | version_response, |
bd60c33e | 1204 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1205 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1206 | } |
1207 | } | |
15b2f647 | 1208 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1209 | } |
1210 | ||
c8212f04 | 1211 | /* Channel message dispatch table */ |
e6242fa0 SH |
1212 | const struct vmbus_channel_message_table_entry |
1213 | channel_message_table[CHANNELMSG_COUNT] = { | |
1214 | { CHANNELMSG_INVALID, 0, NULL }, | |
1215 | { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, | |
1216 | { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, | |
1217 | { CHANNELMSG_REQUESTOFFERS, 0, NULL }, | |
1218 | { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, | |
1219 | { CHANNELMSG_OPENCHANNEL, 0, NULL }, | |
1220 | { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, | |
1221 | { CHANNELMSG_CLOSECHANNEL, 0, NULL }, | |
1222 | { CHANNELMSG_GPADL_HEADER, 0, NULL }, | |
1223 | { CHANNELMSG_GPADL_BODY, 0, NULL }, | |
1224 | { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, | |
1225 | { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, | |
1226 | { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, | |
1227 | { CHANNELMSG_RELID_RELEASED, 0, NULL }, | |
1228 | { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, | |
1229 | { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, | |
1230 | { CHANNELMSG_UNLOAD, 0, NULL }, | |
1231 | { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, | |
1232 | { CHANNELMSG_18, 0, NULL }, | |
1233 | { CHANNELMSG_19, 0, NULL }, | |
1234 | { CHANNELMSG_20, 0, NULL }, | |
1235 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | |
c8212f04 GKH |
1236 | }; |
1237 | ||
3e189519 | 1238 | /* |
e98cb276 | 1239 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1240 | * |
1241 | * This is invoked in the vmbus worker thread context. | |
1242 | */ | |
e98cb276 | 1243 | void vmbus_onmessage(void *context) |
3e7ee490 | 1244 | { |
188963ec | 1245 | struct hv_message *msg = context; |
82250213 | 1246 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1247 | int size; |
1248 | ||
f6feebe0 HZ |
1249 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1250 | size = msg->header.payload_size; | |
3e7ee490 | 1251 | |
716fa52f VK |
1252 | trace_vmbus_on_message(hdr); |
1253 | ||
c50f7fb2 | 1254 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1255 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1256 | hdr->msgtype, size); |
04f50c4d | 1257 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1258 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1259 | return; |
1260 | } | |
1261 | ||
b7c6b02f S |
1262 | if (channel_message_table[hdr->msgtype].message_handler) |
1263 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1264 | else |
0a46618d | 1265 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1266 | } |
1267 | ||
3e189519 | 1268 | /* |
e98cb276 | 1269 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1270 | */ |
e98cb276 | 1271 | int vmbus_request_offers(void) |
3e7ee490 | 1272 | { |
82250213 | 1273 | struct vmbus_channel_message_header *msg; |
188963ec | 1274 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1275 | int ret; |
3e7ee490 | 1276 | |
188963ec | 1277 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1278 | sizeof(struct vmbus_channel_message_header), |
1279 | GFP_KERNEL); | |
188963ec | 1280 | if (!msginfo) |
75910f23 | 1281 | return -ENOMEM; |
3e7ee490 | 1282 | |
c50f7fb2 | 1283 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1284 | |
c50f7fb2 | 1285 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1286 | |
c0bb0392 VK |
1287 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), |
1288 | true); | |
d6706e63 VK |
1289 | |
1290 | trace_vmbus_request_offers(ret); | |
1291 | ||
bd60c33e | 1292 | if (ret != 0) { |
0a46618d | 1293 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1294 | |
0c3b7b2f S |
1295 | goto cleanup; |
1296 | } | |
3e7ee490 | 1297 | |
0c3b7b2f | 1298 | cleanup: |
dd9b15dc | 1299 | kfree(msginfo); |
3e7ee490 | 1300 | |
3e7ee490 HJ |
1301 | return ret; |
1302 | } | |
1303 | ||
e68d2971 S |
1304 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) |
1305 | { | |
1306 | struct list_head *cur, *tmp; | |
1307 | struct vmbus_channel *cur_channel; | |
1308 | ||
1309 | if (primary_channel->sc_creation_callback == NULL) | |
1310 | return; | |
1311 | ||
1312 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1313 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1314 | ||
1315 | primary_channel->sc_creation_callback(cur_channel); | |
1316 | } | |
1317 | } | |
1318 | ||
1319 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1320 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1321 | { | |
1322 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1323 | } | |
1324 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1325 | ||
1326 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1327 | { | |
1328 | bool ret; | |
1329 | ||
1330 | ret = !list_empty(&primary->sc_list); | |
1331 | ||
1332 | if (ret) { | |
1333 | /* | |
1334 | * Invoke the callback on sub-channel creation. | |
1335 | * This will present a uniform interface to the | |
1336 | * clients. | |
1337 | */ | |
1338 | invoke_sc_cb(primary); | |
1339 | } | |
1340 | ||
1341 | return ret; | |
1342 | } | |
1343 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1344 | |
1345 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1346 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1347 | { | |
1348 | channel->chn_rescind_callback = chn_rescind_cb; | |
1349 | } | |
1350 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |