]>
Commit | Line | Data |
---|---|---|
3b20eb23 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
3e7ee490 | 2 | /* |
3e7ee490 HJ |
3 | * Copyright (c) 2009, Microsoft Corporation. |
4 | * | |
3e7ee490 HJ |
5 | * Authors: |
6 | * Haiyang Zhang <haiyangz@microsoft.com> | |
7 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 8 | */ |
0a46618d HJ |
9 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
10 | ||
a0086dc5 | 11 | #include <linux/kernel.h> |
638fea33 | 12 | #include <linux/interrupt.h> |
0c3b7b2f S |
13 | #include <linux/sched.h> |
14 | #include <linux/wait.h> | |
a0086dc5 | 15 | #include <linux/mm.h> |
5a0e3ad6 | 16 | #include <linux/slab.h> |
53af545b | 17 | #include <linux/list.h> |
c88c4e4c | 18 | #include <linux/module.h> |
8b5d6d3b | 19 | #include <linux/completion.h> |
41571916 | 20 | #include <linux/delay.h> |
46a97191 | 21 | #include <linux/hyperv.h> |
e810e48c | 22 | #include <asm/mshyperv.h> |
3f335ea2 | 23 | |
0f2a6619 | 24 | #include "hyperv_vmbus.h" |
3e7ee490 | 25 | |
7047f17d S |
26 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type); |
27 | ||
28 | static const struct vmbus_device vmbus_devs[] = { | |
29 | /* IDE */ | |
30 | { .dev_type = HV_IDE, | |
31 | HV_IDE_GUID, | |
32 | .perf_device = true, | |
33 | }, | |
34 | ||
35 | /* SCSI */ | |
36 | { .dev_type = HV_SCSI, | |
37 | HV_SCSI_GUID, | |
38 | .perf_device = true, | |
39 | }, | |
40 | ||
41 | /* Fibre Channel */ | |
42 | { .dev_type = HV_FC, | |
43 | HV_SYNTHFC_GUID, | |
44 | .perf_device = true, | |
45 | }, | |
46 | ||
47 | /* Synthetic NIC */ | |
48 | { .dev_type = HV_NIC, | |
49 | HV_NIC_GUID, | |
50 | .perf_device = true, | |
51 | }, | |
52 | ||
53 | /* Network Direct */ | |
54 | { .dev_type = HV_ND, | |
55 | HV_ND_GUID, | |
56 | .perf_device = true, | |
57 | }, | |
58 | ||
59 | /* PCIE */ | |
60 | { .dev_type = HV_PCIE, | |
61 | HV_PCIE_GUID, | |
238064f1 | 62 | .perf_device = false, |
7047f17d S |
63 | }, |
64 | ||
65 | /* Synthetic Frame Buffer */ | |
66 | { .dev_type = HV_FB, | |
67 | HV_SYNTHVID_GUID, | |
68 | .perf_device = false, | |
69 | }, | |
70 | ||
71 | /* Synthetic Keyboard */ | |
72 | { .dev_type = HV_KBD, | |
73 | HV_KBD_GUID, | |
74 | .perf_device = false, | |
75 | }, | |
76 | ||
77 | /* Synthetic MOUSE */ | |
78 | { .dev_type = HV_MOUSE, | |
79 | HV_MOUSE_GUID, | |
80 | .perf_device = false, | |
81 | }, | |
82 | ||
83 | /* KVP */ | |
84 | { .dev_type = HV_KVP, | |
85 | HV_KVP_GUID, | |
86 | .perf_device = false, | |
87 | }, | |
88 | ||
89 | /* Time Synch */ | |
90 | { .dev_type = HV_TS, | |
91 | HV_TS_GUID, | |
92 | .perf_device = false, | |
93 | }, | |
94 | ||
95 | /* Heartbeat */ | |
96 | { .dev_type = HV_HB, | |
97 | HV_HEART_BEAT_GUID, | |
98 | .perf_device = false, | |
99 | }, | |
100 | ||
101 | /* Shutdown */ | |
102 | { .dev_type = HV_SHUTDOWN, | |
103 | HV_SHUTDOWN_GUID, | |
104 | .perf_device = false, | |
105 | }, | |
106 | ||
107 | /* File copy */ | |
108 | { .dev_type = HV_FCOPY, | |
109 | HV_FCOPY_GUID, | |
110 | .perf_device = false, | |
111 | }, | |
112 | ||
113 | /* Backup */ | |
114 | { .dev_type = HV_BACKUP, | |
115 | HV_VSS_GUID, | |
116 | .perf_device = false, | |
117 | }, | |
118 | ||
119 | /* Dynamic Memory */ | |
120 | { .dev_type = HV_DM, | |
121 | HV_DM_GUID, | |
122 | .perf_device = false, | |
123 | }, | |
124 | ||
125 | /* Unknown GUID */ | |
f45be72c | 126 | { .dev_type = HV_UNKNOWN, |
7047f17d S |
127 | .perf_device = false, |
128 | }, | |
129 | }; | |
130 | ||
0f98829a | 131 | static const struct { |
593db803 | 132 | guid_t guid; |
0f98829a DC |
133 | } vmbus_unsupported_devs[] = { |
134 | { HV_AVMA1_GUID }, | |
135 | { HV_AVMA2_GUID }, | |
136 | { HV_RDV_GUID }, | |
137 | }; | |
138 | ||
ccb61f8a S |
139 | /* |
140 | * The rescinded channel may be blocked waiting for a response from the host; | |
141 | * take care of that. | |
142 | */ | |
143 | static void vmbus_rescind_cleanup(struct vmbus_channel *channel) | |
144 | { | |
145 | struct vmbus_channel_msginfo *msginfo; | |
146 | unsigned long flags; | |
147 | ||
148 | ||
149 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
192b2d78 | 150 | channel->rescind = true; |
ccb61f8a S |
151 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
152 | msglistentry) { | |
153 | ||
154 | if (msginfo->waiting_channel == channel) { | |
155 | complete(&msginfo->waitevent); | |
156 | break; | |
157 | } | |
158 | } | |
159 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
160 | } | |
161 | ||
593db803 | 162 | static bool is_unsupported_vmbus_devs(const guid_t *guid) |
0f98829a DC |
163 | { |
164 | int i; | |
165 | ||
166 | for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++) | |
593db803 | 167 | if (guid_equal(guid, &vmbus_unsupported_devs[i].guid)) |
0f98829a DC |
168 | return true; |
169 | return false; | |
170 | } | |
171 | ||
172 | static u16 hv_get_dev_type(const struct vmbus_channel *channel) | |
7047f17d | 173 | { |
593db803 | 174 | const guid_t *guid = &channel->offermsg.offer.if_type; |
7047f17d S |
175 | u16 i; |
176 | ||
0f98829a | 177 | if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid)) |
f45be72c | 178 | return HV_UNKNOWN; |
0f98829a | 179 | |
f45be72c | 180 | for (i = HV_IDE; i < HV_UNKNOWN; i++) { |
593db803 | 181 | if (guid_equal(guid, &vmbus_devs[i].guid)) |
7047f17d S |
182 | return i; |
183 | } | |
184 | pr_info("Unknown GUID: %pUl\n", guid); | |
185 | return i; | |
186 | } | |
f38e7dd7 | 187 | |
c88c4e4c | 188 | /** |
fe857bb4 | 189 | * vmbus_prep_negotiate_resp() - Create default response for Negotiate message |
c88c4e4c | 190 | * @icmsghdrp: Pointer to msg header structure |
c88c4e4c | 191 | * @buf: Raw buffer channel data |
fe857bb4 DC |
192 | * @fw_version: The framework versions we can support. |
193 | * @fw_vercnt: The size of @fw_version. | |
194 | * @srv_version: The service versions we can support. | |
195 | * @srv_vercnt: The size of @srv_version. | |
196 | * @nego_fw_version: The selected framework version. | |
197 | * @nego_srv_version: The selected service version. | |
c88c4e4c | 198 | * |
fe857bb4 | 199 | * Note: Versions are given in decreasing order. |
c88c4e4c | 200 | * |
fe857bb4 | 201 | * Set up and fill in default negotiate response message. |
c88c4e4c HJ |
202 | * Mainly used by Hyper-V drivers. |
203 | */ | |
6741335b | 204 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
a1656454 AN |
205 | u8 *buf, const int *fw_version, int fw_vercnt, |
206 | const int *srv_version, int srv_vercnt, | |
207 | int *nego_fw_version, int *nego_srv_version) | |
c88c4e4c | 208 | { |
6741335b S |
209 | int icframe_major, icframe_minor; |
210 | int icmsg_major, icmsg_minor; | |
211 | int fw_major, fw_minor; | |
212 | int srv_major, srv_minor; | |
a1656454 | 213 | int i, j; |
6741335b | 214 | bool found_match = false; |
a1656454 | 215 | struct icmsg_negotiate *negop; |
c836d0ab | 216 | |
a3605300 | 217 | icmsghdrp->icmsgsize = 0x10; |
a3605300 S |
218 | negop = (struct icmsg_negotiate *)&buf[ |
219 | sizeof(struct vmbuspipe_hdr) + | |
220 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 221 | |
6741335b S |
222 | icframe_major = negop->icframe_vercnt; |
223 | icframe_minor = 0; | |
224 | ||
225 | icmsg_major = negop->icmsg_vercnt; | |
226 | icmsg_minor = 0; | |
c836d0ab S |
227 | |
228 | /* | |
229 | * Select the framework version number we will | |
230 | * support. | |
231 | */ | |
232 | ||
a1656454 AN |
233 | for (i = 0; i < fw_vercnt; i++) { |
234 | fw_major = (fw_version[i] >> 16); | |
235 | fw_minor = (fw_version[i] & 0xFFFF); | |
236 | ||
237 | for (j = 0; j < negop->icframe_vercnt; j++) { | |
238 | if ((negop->icversion_data[j].major == fw_major) && | |
239 | (negop->icversion_data[j].minor == fw_minor)) { | |
240 | icframe_major = negop->icversion_data[j].major; | |
241 | icframe_minor = negop->icversion_data[j].minor; | |
242 | found_match = true; | |
243 | break; | |
244 | } | |
6741335b | 245 | } |
a1656454 AN |
246 | |
247 | if (found_match) | |
248 | break; | |
c836d0ab S |
249 | } |
250 | ||
6741335b S |
251 | if (!found_match) |
252 | goto fw_error; | |
253 | ||
254 | found_match = false; | |
255 | ||
a1656454 AN |
256 | for (i = 0; i < srv_vercnt; i++) { |
257 | srv_major = (srv_version[i] >> 16); | |
258 | srv_minor = (srv_version[i] & 0xFFFF); | |
259 | ||
260 | for (j = negop->icframe_vercnt; | |
261 | (j < negop->icframe_vercnt + negop->icmsg_vercnt); | |
262 | j++) { | |
263 | ||
264 | if ((negop->icversion_data[j].major == srv_major) && | |
265 | (negop->icversion_data[j].minor == srv_minor)) { | |
266 | ||
267 | icmsg_major = negop->icversion_data[j].major; | |
268 | icmsg_minor = negop->icversion_data[j].minor; | |
269 | found_match = true; | |
270 | break; | |
271 | } | |
6741335b | 272 | } |
a1656454 AN |
273 | |
274 | if (found_match) | |
275 | break; | |
c88c4e4c | 276 | } |
a3605300 | 277 | |
c836d0ab | 278 | /* |
6741335b | 279 | * Respond with the framework and service |
c836d0ab S |
280 | * version numbers we can support. |
281 | */ | |
6741335b S |
282 | |
283 | fw_error: | |
284 | if (!found_match) { | |
285 | negop->icframe_vercnt = 0; | |
286 | negop->icmsg_vercnt = 0; | |
287 | } else { | |
288 | negop->icframe_vercnt = 1; | |
289 | negop->icmsg_vercnt = 1; | |
290 | } | |
291 | ||
a1656454 AN |
292 | if (nego_fw_version) |
293 | *nego_fw_version = (icframe_major << 16) | icframe_minor; | |
294 | ||
295 | if (nego_srv_version) | |
296 | *nego_srv_version = (icmsg_major << 16) | icmsg_minor; | |
297 | ||
6741335b S |
298 | negop->icversion_data[0].major = icframe_major; |
299 | negop->icversion_data[0].minor = icframe_minor; | |
300 | negop->icversion_data[1].major = icmsg_major; | |
301 | negop->icversion_data[1].minor = icmsg_minor; | |
302 | return found_match; | |
c88c4e4c | 303 | } |
a3605300 | 304 | |
da0e9631 | 305 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 306 | |
3e189519 | 307 | /* |
e98cb276 | 308 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 309 | */ |
50fe56d2 | 310 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 311 | { |
aded7165 | 312 | struct vmbus_channel *channel; |
3e7ee490 | 313 | |
aded7165 | 314 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 315 | if (!channel) |
3e7ee490 | 316 | return NULL; |
3e7ee490 | 317 | |
67fae053 | 318 | spin_lock_init(&channel->lock); |
7fa32e5e | 319 | init_completion(&channel->rescind_event); |
e68d2971 S |
320 | |
321 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 322 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 323 | |
631e63a9 SH |
324 | tasklet_init(&channel->callback_event, |
325 | vmbus_on_event, (unsigned long)channel); | |
326 | ||
14948e39 KB |
327 | hv_ringbuffer_pre_init(channel); |
328 | ||
3e7ee490 HJ |
329 | return channel; |
330 | } | |
331 | ||
3e189519 | 332 | /* |
e98cb276 | 333 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 334 | */ |
9f3e28e3 | 335 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 336 | { |
631e63a9 | 337 | tasklet_kill(&channel->callback_event); |
46fc1548 | 338 | vmbus_remove_channel_attr_group(channel); |
8200f208 | 339 | |
c2e5df61 | 340 | kobject_put(&channel->kobj); |
3e7ee490 HJ |
341 | } |
342 | ||
3a28fa35 S |
343 | static void percpu_channel_enq(void *arg) |
344 | { | |
345 | struct vmbus_channel *channel = arg; | |
37cdd991 SH |
346 | struct hv_per_cpu_context *hv_cpu |
347 | = this_cpu_ptr(hv_context.cpu_context); | |
3a28fa35 | 348 | |
8200f208 | 349 | list_add_tail_rcu(&channel->percpu_list, &hv_cpu->chan_list); |
3a28fa35 | 350 | } |
8b5d6d3b | 351 | |
3a28fa35 S |
352 | static void percpu_channel_deq(void *arg) |
353 | { | |
354 | struct vmbus_channel *channel = arg; | |
355 | ||
8200f208 | 356 | list_del_rcu(&channel->percpu_list); |
3a28fa35 | 357 | } |
8b5d6d3b | 358 | |
ed6cfcc5 | 359 | |
f52078cf | 360 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 361 | { |
ed6cfcc5 | 362 | struct vmbus_channel_relid_released msg; |
259cc665 | 363 | int ret; |
4b2f9abe | 364 | |
c8705979 | 365 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 366 | msg.child_relid = relid; |
c8705979 | 367 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
259cc665 VK |
368 | ret = vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released), |
369 | true); | |
370 | ||
371 | trace_vmbus_release_relid(&msg, ret); | |
f52078cf | 372 | } |
c8705979 | 373 | |
800b9329 | 374 | void hv_process_channel_removal(struct vmbus_channel *channel) |
f52078cf | 375 | { |
800b9329 | 376 | struct vmbus_channel *primary_channel; |
f52078cf | 377 | unsigned long flags; |
f52078cf | 378 | |
85d9aa70 | 379 | BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); |
192b2d78 | 380 | BUG_ON(!channel->rescind); |
800b9329 | 381 | |
2115b561 S |
382 | if (channel->target_cpu != get_cpu()) { |
383 | put_cpu(); | |
3a28fa35 S |
384 | smp_call_function_single(channel->target_cpu, |
385 | percpu_channel_deq, channel, true); | |
2115b561 | 386 | } else { |
3a28fa35 | 387 | percpu_channel_deq(channel); |
2115b561 S |
388 | put_cpu(); |
389 | } | |
3a28fa35 | 390 | |
e68d2971 | 391 | if (channel->primary_channel == NULL) { |
e68d2971 | 392 | list_del(&channel->listentry); |
ca1c4b74 DC |
393 | |
394 | primary_channel = channel; | |
e68d2971 S |
395 | } else { |
396 | primary_channel = channel->primary_channel; | |
67fae053 | 397 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 398 | list_del(&channel->sc_list); |
67fae053 | 399 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 400 | } |
ca1c4b74 DC |
401 | |
402 | /* | |
403 | * We need to free the bit for init_vp_index() to work in the case | |
404 | * of sub-channel, when we reload drivers like hv_netvsc. | |
405 | */ | |
509879bd S |
406 | if (channel->affinity_policy == HV_LOCALIZED) |
407 | cpumask_clear_cpu(channel->target_cpu, | |
408 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 409 | |
800b9329 | 410 | vmbus_release_relid(channel->offermsg.child_relid); |
638fea33 | 411 | |
c8705979 | 412 | free_channel(channel); |
4b2f9abe | 413 | } |
8b5d6d3b | 414 | |
93e5bd06 S |
415 | void vmbus_free_channels(void) |
416 | { | |
813c5b79 DC |
417 | struct vmbus_channel *channel, *tmp; |
418 | ||
419 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
420 | listentry) { | |
34c6801e | 421 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 422 | channel->rescind = true; |
93e5bd06 | 423 | |
93e5bd06 | 424 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
425 | } |
426 | } | |
427 | ||
37c2578c DC |
428 | /* Note: the function can run concurrently for primary/sub channels. */ |
429 | static void vmbus_add_channel_work(struct work_struct *work) | |
3e7ee490 | 430 | { |
37c2578c DC |
431 | struct vmbus_channel *newchannel = |
432 | container_of(work, struct vmbus_channel, add_channel_work); | |
433 | struct vmbus_channel *primary_channel = newchannel->primary_channel; | |
0f5e44ca | 434 | unsigned long flags; |
7047f17d | 435 | u16 dev_type; |
85d9aa70 | 436 | int ret; |
3e7ee490 | 437 | |
0f98829a | 438 | dev_type = hv_get_dev_type(newchannel); |
7047f17d S |
439 | |
440 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 441 | |
8dfd3326 VK |
442 | if (newchannel->target_cpu != get_cpu()) { |
443 | put_cpu(); | |
444 | smp_call_function_single(newchannel->target_cpu, | |
445 | percpu_channel_enq, | |
446 | newchannel, true); | |
447 | } else { | |
448 | percpu_channel_enq(newchannel); | |
449 | put_cpu(); | |
3e7ee490 HJ |
450 | } |
451 | ||
42dceebe S |
452 | /* |
453 | * This state is used to indicate a successful open | |
454 | * so that when we do close the channel normally, we | |
37c2578c | 455 | * can cleanup properly. |
42dceebe S |
456 | */ |
457 | newchannel->state = CHANNEL_OPEN_STATE; | |
458 | ||
37c2578c DC |
459 | if (primary_channel != NULL) { |
460 | /* newchannel is a sub-channel. */ | |
461 | struct hv_device *dev = primary_channel->device_obj; | |
c2e5df61 | 462 | |
50229128 | 463 | if (vmbus_add_channel_kobj(dev, newchannel)) |
37c2578c DC |
464 | goto err_deq_chan; |
465 | ||
466 | if (primary_channel->sc_creation_callback != NULL) | |
467 | primary_channel->sc_creation_callback(newchannel); | |
c2e5df61 | 468 | |
192b2d78 | 469 | newchannel->probe_done = true; |
8dfd3326 VK |
470 | return; |
471 | } | |
472 | ||
bd60c33e | 473 | /* |
37c2578c | 474 | * Start the process of binding the primary channel to the driver |
bd60c33e | 475 | */ |
f2c73011 | 476 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
477 | &newchannel->offermsg.offer.if_type, |
478 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 479 | newchannel); |
9c3a6f7e | 480 | if (!newchannel->device_obj) |
5b1e5b53 | 481 | goto err_deq_chan; |
3e7ee490 | 482 | |
7047f17d | 483 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
484 | /* |
485 | * Add the new device to the bus. This will kick off device-driver | |
486 | * binding which eventually invokes the device driver's AddDevice() | |
487 | * method. | |
488 | */ | |
85d9aa70 | 489 | ret = vmbus_device_register(newchannel->device_obj); |
85d9aa70 DC |
490 | |
491 | if (ret != 0) { | |
d43e2fe7 DC |
492 | pr_err("unable to add child device object (relid %d)\n", |
493 | newchannel->offermsg.child_relid); | |
494 | kfree(newchannel->device_obj); | |
495 | goto err_deq_chan; | |
496 | } | |
54a66265 | 497 | |
6f3d791f | 498 | newchannel->probe_done = true; |
9c3a6f7e | 499 | return; |
2dd37cb8 | 500 | |
5b1e5b53 | 501 | err_deq_chan: |
d6f591e3 | 502 | mutex_lock(&vmbus_connection.channel_mutex); |
37c2578c DC |
503 | |
504 | /* | |
505 | * We need to set the flag, otherwise | |
506 | * vmbus_onoffer_rescind() can be blocked. | |
507 | */ | |
508 | newchannel->probe_done = true; | |
509 | ||
510 | if (primary_channel == NULL) { | |
511 | list_del(&newchannel->listentry); | |
512 | } else { | |
513 | spin_lock_irqsave(&primary_channel->lock, flags); | |
514 | list_del(&newchannel->sc_list); | |
515 | spin_unlock_irqrestore(&primary_channel->lock, flags); | |
516 | } | |
517 | ||
d6f591e3 | 518 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
519 | |
520 | if (newchannel->target_cpu != get_cpu()) { | |
521 | put_cpu(); | |
522 | smp_call_function_single(newchannel->target_cpu, | |
37c2578c DC |
523 | percpu_channel_deq, |
524 | newchannel, true); | |
5b1e5b53 S |
525 | } else { |
526 | percpu_channel_deq(newchannel); | |
527 | put_cpu(); | |
528 | } | |
638fea33 DC |
529 | |
530 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 531 | |
9c3a6f7e | 532 | free_channel(newchannel); |
3e7ee490 HJ |
533 | } |
534 | ||
37c2578c DC |
535 | /* |
536 | * vmbus_process_offer - Process the offer by creating a channel/device | |
537 | * associated with this offer | |
538 | */ | |
539 | static void vmbus_process_offer(struct vmbus_channel *newchannel) | |
540 | { | |
541 | struct vmbus_channel *channel; | |
542 | struct workqueue_struct *wq; | |
543 | unsigned long flags; | |
544 | bool fnew = true; | |
545 | ||
546 | mutex_lock(&vmbus_connection.channel_mutex); | |
547 | ||
548 | /* | |
549 | * Now that we have acquired the channel_mutex, | |
550 | * we can release the potentially racing rescind thread. | |
551 | */ | |
552 | atomic_dec(&vmbus_connection.offer_in_progress); | |
553 | ||
554 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
593db803 AS |
555 | if (guid_equal(&channel->offermsg.offer.if_type, |
556 | &newchannel->offermsg.offer.if_type) && | |
557 | guid_equal(&channel->offermsg.offer.if_instance, | |
558 | &newchannel->offermsg.offer.if_instance)) { | |
37c2578c DC |
559 | fnew = false; |
560 | break; | |
561 | } | |
562 | } | |
563 | ||
564 | if (fnew) | |
565 | list_add_tail(&newchannel->listentry, | |
566 | &vmbus_connection.chn_list); | |
567 | else { | |
568 | /* | |
569 | * Check to see if this is a valid sub-channel. | |
570 | */ | |
571 | if (newchannel->offermsg.offer.sub_channel_index == 0) { | |
572 | mutex_unlock(&vmbus_connection.channel_mutex); | |
573 | /* | |
574 | * Don't call free_channel(), because newchannel->kobj | |
575 | * is not initialized yet. | |
576 | */ | |
577 | kfree(newchannel); | |
578 | WARN_ON_ONCE(1); | |
579 | return; | |
580 | } | |
581 | /* | |
582 | * Process the sub-channel. | |
583 | */ | |
584 | newchannel->primary_channel = channel; | |
585 | spin_lock_irqsave(&channel->lock, flags); | |
586 | list_add_tail(&newchannel->sc_list, &channel->sc_list); | |
587 | spin_unlock_irqrestore(&channel->lock, flags); | |
588 | } | |
589 | ||
590 | mutex_unlock(&vmbus_connection.channel_mutex); | |
591 | ||
592 | /* | |
593 | * vmbus_process_offer() mustn't call channel->sc_creation_callback() | |
594 | * directly for sub-channels, because sc_creation_callback() -> | |
595 | * vmbus_open() may never get the host's response to the | |
596 | * OPEN_CHANNEL message (the host may rescind a channel at any time, | |
597 | * e.g. in the case of hot removing a NIC), and vmbus_onoffer_rescind() | |
598 | * may not wake up the vmbus_open() as it's blocked due to a non-zero | |
599 | * vmbus_connection.offer_in_progress, and finally we have a deadlock. | |
600 | * | |
601 | * The above is also true for primary channels, if the related device | |
602 | * drivers use sync probing mode by default. | |
603 | * | |
604 | * And, usually the handling of primary channels and sub-channels can | |
605 | * depend on each other, so we should offload them to different | |
606 | * workqueues to avoid possible deadlock, e.g. in sync-probing mode, | |
607 | * NIC1's netvsc_subchan_work() can race with NIC2's netvsc_probe() -> | |
608 | * rtnl_lock(), and causes deadlock: the former gets the rtnl_lock | |
609 | * and waits for all the sub-channels to appear, but the latter | |
610 | * can't get the rtnl_lock and this blocks the handling of | |
611 | * sub-channels. | |
612 | */ | |
613 | INIT_WORK(&newchannel->add_channel_work, vmbus_add_channel_work); | |
614 | wq = fnew ? vmbus_connection.handle_primary_chan_wq : | |
615 | vmbus_connection.handle_sub_chan_wq; | |
616 | queue_work(wq, &newchannel->add_channel_work); | |
617 | } | |
618 | ||
a119845f S |
619 | /* |
620 | * We use this state to statically distribute the channel interrupt load. | |
621 | */ | |
1f656ff3 | 622 | static int next_numa_node_id; |
37c2578c DC |
623 | /* |
624 | * init_vp_index() accesses global variables like next_numa_node_id, and | |
625 | * it can run concurrently for primary channels and sub-channels: see | |
626 | * vmbus_process_offer(), so we need the lock to protect the global | |
627 | * variables. | |
628 | */ | |
629 | static DEFINE_SPINLOCK(bind_channel_to_cpu_lock); | |
a119845f S |
630 | |
631 | /* | |
632 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 | 633 | * channel interrupt load by binding a channel to VCPU. |
ce767047 HZ |
634 | * We distribute the interrupt loads to one or more NUMA nodes based on |
635 | * the channel's affinity_policy. | |
1f656ff3 S |
636 | * |
637 | * For pre-win8 hosts or non-performance critical channels we assign the | |
638 | * first CPU in the first NUMA node. | |
a119845f | 639 | */ |
7047f17d | 640 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
641 | { |
642 | u32 cur_cpu; | |
7047f17d | 643 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
644 | struct vmbus_channel *primary = channel->primary_channel; |
645 | int next_node; | |
25355252 | 646 | cpumask_var_t available_mask; |
9f01ec53 | 647 | struct cpumask *alloced_mask; |
a119845f | 648 | |
a119845f | 649 | if ((vmbus_proto_version == VERSION_WS2008) || |
25355252 DC |
650 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn) || |
651 | !alloc_cpumask_var(&available_mask, GFP_KERNEL)) { | |
a119845f S |
652 | /* |
653 | * Prior to win8, all channel interrupts are | |
654 | * delivered on cpu 0. | |
655 | * Also if the channel is not a performance critical | |
656 | * channel, bind it to cpu 0. | |
25355252 | 657 | * In case alloc_cpumask_var() fails, bind it to cpu 0. |
a119845f | 658 | */ |
1f656ff3 | 659 | channel->numa_node = 0; |
d3ba720d | 660 | channel->target_cpu = 0; |
7415aea6 | 661 | channel->target_vp = hv_cpu_number_to_vp_number(0); |
d3ba720d | 662 | return; |
a119845f | 663 | } |
ce59fec8 | 664 | |
37c2578c DC |
665 | spin_lock(&bind_channel_to_cpu_lock); |
666 | ||
ce59fec8 | 667 | /* |
509879bd S |
668 | * Based on the channel affinity policy, we will assign the NUMA |
669 | * nodes. | |
ce59fec8 | 670 | */ |
509879bd S |
671 | |
672 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
673 | while (true) { |
674 | next_node = next_numa_node_id++; | |
509879bd | 675 | if (next_node == nr_node_ids) { |
1f656ff3 | 676 | next_node = next_numa_node_id = 0; |
509879bd S |
677 | continue; |
678 | } | |
1f656ff3 S |
679 | if (cpumask_empty(cpumask_of_node(next_node))) |
680 | continue; | |
681 | break; | |
682 | } | |
683 | channel->numa_node = next_node; | |
684 | primary = channel; | |
685 | } | |
9f01ec53 | 686 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 687 | |
9f01ec53 | 688 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 689 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 690 | /* |
1f656ff3 S |
691 | * We have cycled through all the CPUs in the node; |
692 | * reset the alloced map. | |
ce59fec8 | 693 | */ |
9f01ec53 | 694 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
695 | } |
696 | ||
25355252 | 697 | cpumask_xor(available_mask, alloced_mask, |
1f656ff3 S |
698 | cpumask_of_node(primary->numa_node)); |
699 | ||
3b71107d | 700 | cur_cpu = -1; |
79fd8e70 | 701 | |
509879bd S |
702 | if (primary->affinity_policy == HV_LOCALIZED) { |
703 | /* | |
704 | * Normally Hyper-V host doesn't create more subchannels | |
705 | * than there are VCPUs on the node but it is possible when not | |
706 | * all present VCPUs on the node are initialized by guest. | |
707 | * Clear the alloced_cpus_in_node to start over. | |
708 | */ | |
709 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
710 | cpumask_of_node(primary->numa_node))) | |
711 | cpumask_clear(&primary->alloced_cpus_in_node); | |
712 | } | |
79fd8e70 | 713 | |
3b71107d | 714 | while (true) { |
25355252 | 715 | cur_cpu = cpumask_next(cur_cpu, available_mask); |
3b71107d DC |
716 | if (cur_cpu >= nr_cpu_ids) { |
717 | cur_cpu = -1; | |
25355252 | 718 | cpumask_copy(available_mask, |
3b71107d DC |
719 | cpumask_of_node(primary->numa_node)); |
720 | continue; | |
721 | } | |
722 | ||
509879bd S |
723 | if (primary->affinity_policy == HV_LOCALIZED) { |
724 | /* | |
725 | * NOTE: in the case of sub-channel, we clear the | |
726 | * sub-channel related bit(s) in | |
727 | * primary->alloced_cpus_in_node in | |
728 | * hv_process_channel_removal(), so when we | |
729 | * reload drivers like hv_netvsc in SMP guest, here | |
730 | * we're able to re-allocate | |
731 | * bit from primary->alloced_cpus_in_node. | |
732 | */ | |
733 | if (!cpumask_test_cpu(cur_cpu, | |
734 | &primary->alloced_cpus_in_node)) { | |
735 | cpumask_set_cpu(cur_cpu, | |
736 | &primary->alloced_cpus_in_node); | |
737 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
738 | break; | |
739 | } | |
740 | } else { | |
3b71107d DC |
741 | cpumask_set_cpu(cur_cpu, alloced_mask); |
742 | break; | |
743 | } | |
744 | } | |
1f656ff3 | 745 | |
d3ba720d | 746 | channel->target_cpu = cur_cpu; |
7415aea6 | 747 | channel->target_vp = hv_cpu_number_to_vp_number(cur_cpu); |
25355252 | 748 | |
37c2578c DC |
749 | spin_unlock(&bind_channel_to_cpu_lock); |
750 | ||
25355252 | 751 | free_cpumask_var(available_mask); |
a119845f S |
752 | } |
753 | ||
41571916 VK |
754 | static void vmbus_wait_for_unload(void) |
755 | { | |
cd95aad5 VK |
756 | int cpu; |
757 | void *page_addr; | |
758 | struct hv_message *msg; | |
41571916 | 759 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 760 | u32 message_type; |
41571916 | 761 | |
cd95aad5 VK |
762 | /* |
763 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
764 | * used for initial contact or to CPU0 depending on host version. When | |
765 | * we're crashing on a different CPU let's hope that IRQ handler on | |
766 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
767 | * functional and vmbus_unload_response() will complete | |
768 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
769 | * read message pages for all CPUs directly. | |
770 | */ | |
41571916 | 771 | while (1) { |
cd95aad5 VK |
772 | if (completion_done(&vmbus_connection.unload_event)) |
773 | break; | |
41571916 | 774 | |
cd95aad5 | 775 | for_each_online_cpu(cpu) { |
37cdd991 SH |
776 | struct hv_per_cpu_context *hv_cpu |
777 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
778 | ||
779 | page_addr = hv_cpu->synic_message_page; | |
780 | msg = (struct hv_message *)page_addr | |
781 | + VMBUS_MESSAGE_SINT; | |
41571916 | 782 | |
cd95aad5 VK |
783 | message_type = READ_ONCE(msg->header.message_type); |
784 | if (message_type == HVMSG_NONE) | |
785 | continue; | |
41571916 | 786 | |
cd95aad5 VK |
787 | hdr = (struct vmbus_channel_message_header *) |
788 | msg->u.payload; | |
789 | ||
790 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
791 | complete(&vmbus_connection.unload_event); | |
792 | ||
793 | vmbus_signal_eom(msg, message_type); | |
794 | } | |
795 | ||
796 | mdelay(10); | |
797 | } | |
798 | ||
799 | /* | |
800 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
801 | * maybe-pending messages on all CPUs to be able to receive new | |
802 | * messages after we reconnect. | |
803 | */ | |
804 | for_each_online_cpu(cpu) { | |
37cdd991 SH |
805 | struct hv_per_cpu_context *hv_cpu |
806 | = per_cpu_ptr(hv_context.cpu_context, cpu); | |
807 | ||
808 | page_addr = hv_cpu->synic_message_page; | |
cd95aad5 VK |
809 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; |
810 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
811 | } |
812 | } | |
813 | ||
2db84eff S |
814 | /* |
815 | * vmbus_unload_response - Handler for the unload response. | |
816 | */ | |
817 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
818 | { | |
819 | /* | |
820 | * This is a global event; just wakeup the waiting thread. | |
821 | * Once we successfully unload, we can cleanup the monitor state. | |
822 | */ | |
823 | complete(&vmbus_connection.unload_event); | |
824 | } | |
825 | ||
75ff3a8a | 826 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
827 | { |
828 | struct vmbus_channel_message_header hdr; | |
829 | ||
4a54243f VK |
830 | /* Pre-Win2012R2 hosts don't support reconnect */ |
831 | if (vmbus_proto_version < VERSION_WIN8_1) | |
832 | return; | |
833 | ||
2db84eff S |
834 | init_completion(&vmbus_connection.unload_event); |
835 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
836 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
c0bb0392 VK |
837 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header), |
838 | !crash); | |
2db84eff | 839 | |
41571916 VK |
840 | /* |
841 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
842 | * happening in an interrupt context, where scheduling is impossible. | |
843 | */ | |
75ff3a8a | 844 | if (!crash) |
41571916 VK |
845 | wait_for_completion(&vmbus_connection.unload_event); |
846 | else | |
847 | vmbus_wait_for_unload(); | |
2db84eff S |
848 | } |
849 | ||
e3ede02a DC |
850 | /* |
851 | * find_primary_channel_by_offer - Get the channel object given the new offer. | |
852 | * This is only used in the resume path of hibernation. | |
853 | */ | |
854 | static struct vmbus_channel * | |
855 | find_primary_channel_by_offer(const struct vmbus_channel_offer_channel *offer) | |
856 | { | |
857 | struct vmbus_channel *channel = NULL, *iter; | |
858 | const guid_t *inst1, *inst2; | |
859 | ||
860 | /* Ignore sub-channel offers. */ | |
861 | if (offer->offer.sub_channel_index != 0) | |
862 | return NULL; | |
863 | ||
864 | mutex_lock(&vmbus_connection.channel_mutex); | |
865 | ||
866 | list_for_each_entry(iter, &vmbus_connection.chn_list, listentry) { | |
867 | inst1 = &iter->offermsg.offer.if_instance; | |
868 | inst2 = &offer->offer.if_instance; | |
869 | ||
870 | if (guid_equal(inst1, inst2)) { | |
871 | channel = iter; | |
872 | break; | |
873 | } | |
874 | } | |
875 | ||
876 | mutex_unlock(&vmbus_connection.channel_mutex); | |
877 | ||
878 | return channel; | |
879 | } | |
880 | ||
3e189519 | 881 | /* |
e98cb276 | 882 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 883 | * |
bd60c33e | 884 | */ |
e98cb276 | 885 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 886 | { |
bd60c33e | 887 | struct vmbus_channel_offer_channel *offer; |
e3ede02a DC |
888 | struct vmbus_channel *oldchannel, *newchannel; |
889 | size_t offer_sz; | |
3e7ee490 | 890 | |
bd60c33e | 891 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 892 | |
03b81e66 VK |
893 | trace_vmbus_onoffer(offer); |
894 | ||
e3ede02a DC |
895 | oldchannel = find_primary_channel_by_offer(offer); |
896 | ||
897 | if (oldchannel != NULL) { | |
898 | atomic_dec(&vmbus_connection.offer_in_progress); | |
899 | ||
900 | /* | |
901 | * We're resuming from hibernation: we expect the host to send | |
902 | * exactly the same offers that we had before the hibernation. | |
903 | */ | |
904 | offer_sz = sizeof(*offer); | |
905 | if (memcmp(offer, &oldchannel->offermsg, offer_sz) == 0) | |
906 | return; | |
907 | ||
908 | pr_debug("Mismatched offer from the host (relid=%d)\n", | |
909 | offer->child_relid); | |
910 | ||
911 | print_hex_dump_debug("Old vmbus offer: ", DUMP_PREFIX_OFFSET, | |
912 | 16, 4, &oldchannel->offermsg, offer_sz, | |
913 | false); | |
914 | print_hex_dump_debug("New vmbus offer: ", DUMP_PREFIX_OFFSET, | |
915 | 16, 4, offer, offer_sz, false); | |
916 | return; | |
917 | } | |
918 | ||
454f18a9 | 919 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 920 | newchannel = alloc_channel(); |
188963ec | 921 | if (!newchannel) { |
9a547602 | 922 | vmbus_release_relid(offer->child_relid); |
54a66265 | 923 | atomic_dec(&vmbus_connection.offer_in_progress); |
0a46618d | 924 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
925 | return; |
926 | } | |
927 | ||
b3bf60c7 S |
928 | /* |
929 | * Setup state for signalling the host. | |
930 | */ | |
05784171 | 931 | newchannel->sig_event = VMBUS_EVENT_CONNECTION_ID; |
b3bf60c7 S |
932 | |
933 | if (vmbus_proto_version != VERSION_WS2008) { | |
934 | newchannel->is_dedicated_interrupt = | |
935 | (offer->is_dedicated_interrupt != 0); | |
05784171 | 936 | newchannel->sig_event = offer->connection_id; |
b3bf60c7 S |
937 | } |
938 | ||
c50f7fb2 | 939 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 940 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
941 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
942 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 943 | |
2dd37cb8 | 944 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
945 | } |
946 | ||
3e189519 | 947 | /* |
e98cb276 | 948 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
949 | * |
950 | * We queue a work item to process this offer synchronously | |
951 | */ | |
e98cb276 | 952 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 953 | { |
bd60c33e | 954 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 955 | struct vmbus_channel *channel; |
d43e2fe7 | 956 | struct device *dev; |
3e7ee490 | 957 | |
bd60c33e | 958 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 | 959 | |
5175167c VK |
960 | trace_vmbus_onoffer_rescind(rescind); |
961 | ||
54a66265 S |
962 | /* |
963 | * The offer msg and the corresponding rescind msg | |
964 | * from the host are guranteed to be ordered - | |
965 | * offer comes in first and then the rescind. | |
966 | * Since we process these events in work elements, | |
967 | * and with preemption, we may end up processing | |
968 | * the events out of order. Given that we handle these | |
969 | * work elements on the same CPU, this is possible only | |
970 | * in the case of preemption. In any case wait here | |
971 | * until the offer processing has moved beyond the | |
972 | * point where the channel is discoverable. | |
973 | */ | |
974 | ||
975 | while (atomic_read(&vmbus_connection.offer_in_progress) != 0) { | |
976 | /* | |
977 | * We wait here until any channel offer is currently | |
978 | * being processed. | |
979 | */ | |
980 | msleep(1); | |
981 | } | |
982 | ||
85d9aa70 | 983 | mutex_lock(&vmbus_connection.channel_mutex); |
d43e2fe7 | 984 | channel = relid2channel(rescind->child_relid); |
54a66265 | 985 | mutex_unlock(&vmbus_connection.channel_mutex); |
98e08702 | 986 | |
2dd37cb8 | 987 | if (channel == NULL) { |
f52078cf | 988 | /* |
54a66265 S |
989 | * We failed in processing the offer message; |
990 | * we would have cleaned up the relid in that | |
991 | * failure path. | |
f52078cf | 992 | */ |
54a66265 | 993 | return; |
2dd37cb8 | 994 | } |
3e7ee490 | 995 | |
d3b26dd7 DC |
996 | /* |
997 | * Before setting channel->rescind in vmbus_rescind_cleanup(), we | |
998 | * should make sure the channel callback is not running any more. | |
999 | */ | |
1000 | vmbus_reset_channel_cb(channel); | |
1001 | ||
6f3d791f S |
1002 | /* |
1003 | * Now wait for offer handling to complete. | |
1004 | */ | |
7fa32e5e | 1005 | vmbus_rescind_cleanup(channel); |
6f3d791f S |
1006 | while (READ_ONCE(channel->probe_done) == false) { |
1007 | /* | |
1008 | * We wait here until any channel offer is currently | |
1009 | * being processed. | |
1010 | */ | |
1011 | msleep(1); | |
1012 | } | |
1013 | ||
1014 | /* | |
1015 | * At this point, the rescind handling can proceed safely. | |
1016 | */ | |
1017 | ||
d43e2fe7 | 1018 | if (channel->device_obj) { |
499e8401 DC |
1019 | if (channel->chn_rescind_callback) { |
1020 | channel->chn_rescind_callback(channel); | |
54a66265 | 1021 | return; |
499e8401 | 1022 | } |
d43e2fe7 DC |
1023 | /* |
1024 | * We will have to unregister this device from the | |
1025 | * driver core. | |
1026 | */ | |
1027 | dev = get_device(&channel->device_obj->device); | |
1028 | if (dev) { | |
1029 | vmbus_device_unregister(channel->device_obj); | |
1030 | put_device(dev); | |
1031 | } | |
2dd37cb8 | 1032 | } |
54a66265 S |
1033 | if (channel->primary_channel != NULL) { |
1034 | /* | |
1035 | * Sub-channel is being rescinded. Following is the channel | |
1036 | * close sequence when initiated from the driveri (refer to | |
1037 | * vmbus_close() for details): | |
1038 | * 1. Close all sub-channels first | |
1039 | * 2. Then close the primary channel. | |
1040 | */ | |
192b2d78 | 1041 | mutex_lock(&vmbus_connection.channel_mutex); |
54a66265 S |
1042 | if (channel->state == CHANNEL_OPEN_STATE) { |
1043 | /* | |
1044 | * The channel is currently not open; | |
1045 | * it is safe for us to cleanup the channel. | |
1046 | */ | |
800b9329 | 1047 | hv_process_channel_removal(channel); |
7fa32e5e S |
1048 | } else { |
1049 | complete(&channel->rescind_event); | |
54a66265 | 1050 | } |
192b2d78 | 1051 | mutex_unlock(&vmbus_connection.channel_mutex); |
54a66265 | 1052 | } |
85d9aa70 DC |
1053 | } |
1054 | ||
1055 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
1056 | { | |
85d9aa70 DC |
1057 | BUG_ON(!is_hvsock_channel(channel)); |
1058 | ||
9d35593b DC |
1059 | /* We always get a rescind msg when a connection is closed. */ |
1060 | while (!READ_ONCE(channel->probe_done) || !READ_ONCE(channel->rescind)) | |
1061 | msleep(1); | |
1062 | ||
85d9aa70 | 1063 | vmbus_device_unregister(channel->device_obj); |
3e7ee490 | 1064 | } |
85d9aa70 DC |
1065 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
1066 | ||
3e7ee490 | 1067 | |
3e189519 | 1068 | /* |
e98cb276 HZ |
1069 | * vmbus_onoffers_delivered - |
1070 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
1071 | * |
1072 | * Nothing to do here. | |
1073 | */ | |
e98cb276 | 1074 | static void vmbus_onoffers_delivered( |
bd60c33e | 1075 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1076 | { |
3e7ee490 HJ |
1077 | } |
1078 | ||
3e189519 | 1079 | /* |
e98cb276 | 1080 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
1081 | * |
1082 | * This is invoked when we received a response to our channel open request. | |
1083 | * Find the matching request, copy the response and signal the requesting | |
1084 | * thread. | |
1085 | */ | |
e98cb276 | 1086 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1087 | { |
bd60c33e | 1088 | struct vmbus_channel_open_result *result; |
188963ec HZ |
1089 | struct vmbus_channel_msginfo *msginfo; |
1090 | struct vmbus_channel_message_header *requestheader; | |
1091 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 1092 | unsigned long flags; |
3e7ee490 | 1093 | |
bd60c33e | 1094 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 1095 | |
9f23ce1a VK |
1096 | trace_vmbus_onopen_result(result); |
1097 | ||
bd60c33e GKH |
1098 | /* |
1099 | * Find the open msg, copy the result and signal/unblock the wait 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_OPENCHANNEL) { |
188963ec | 1109 | openmsg = |
c50f7fb2 HZ |
1110 | (struct vmbus_channel_open_channel *)msginfo->msg; |
1111 | if (openmsg->child_relid == result->child_relid && | |
1112 | openmsg->openid == result->openid) { | |
1113 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 1114 | result, |
9568a193 S |
1115 | sizeof( |
1116 | struct vmbus_channel_open_result)); | |
1117 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1118 | break; |
1119 | } | |
1120 | } | |
1121 | } | |
15b2f647 | 1122 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1123 | } |
1124 | ||
3e189519 | 1125 | /* |
e98cb276 | 1126 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
1127 | * |
1128 | * This is invoked when we received a response to our gpadl create request. | |
1129 | * Find the matching request, copy the response and signal the requesting | |
1130 | * thread. | |
1131 | */ | |
e98cb276 | 1132 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1133 | { |
188963ec | 1134 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
1135 | struct vmbus_channel_msginfo *msginfo; |
1136 | struct vmbus_channel_message_header *requestheader; | |
1137 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 1138 | unsigned long flags; |
3e7ee490 | 1139 | |
188963ec | 1140 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 1141 | |
a13bf0ea VK |
1142 | trace_vmbus_ongpadl_created(gpadlcreated); |
1143 | ||
bd60c33e GKH |
1144 | /* |
1145 | * Find the establish msg, copy the result and signal/unblock the wait | |
1146 | * event | |
1147 | */ | |
15b2f647 | 1148 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1149 | |
ebb61e5f HJ |
1150 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1151 | msglistentry) { | |
188963ec | 1152 | requestheader = |
c50f7fb2 | 1153 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 1154 | |
c50f7fb2 | 1155 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
1156 | gpadlheader = |
1157 | (struct vmbus_channel_gpadl_header *)requestheader; | |
1158 | ||
c50f7fb2 HZ |
1159 | if ((gpadlcreated->child_relid == |
1160 | gpadlheader->child_relid) && | |
1161 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
1162 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 1163 | gpadlcreated, |
9568a193 S |
1164 | sizeof( |
1165 | struct vmbus_channel_gpadl_created)); | |
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_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
1176 | * |
1177 | * This is invoked when we received a response to our gpadl teardown request. | |
1178 | * Find the matching request, copy the response and signal the requesting | |
1179 | * thread. | |
1180 | */ | |
e98cb276 | 1181 | static void vmbus_ongpadl_torndown( |
bd60c33e | 1182 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1183 | { |
188963ec | 1184 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
1185 | struct vmbus_channel_msginfo *msginfo; |
1186 | struct vmbus_channel_message_header *requestheader; | |
1187 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 1188 | unsigned long flags; |
3e7ee490 | 1189 | |
188963ec | 1190 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e | 1191 | |
602a8c52 VK |
1192 | trace_vmbus_ongpadl_torndown(gpadl_torndown); |
1193 | ||
bd60c33e GKH |
1194 | /* |
1195 | * Find the open msg, copy the result and signal/unblock the wait event | |
1196 | */ | |
15b2f647 | 1197 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1198 | |
ebb61e5f HJ |
1199 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1200 | msglistentry) { | |
188963ec | 1201 | requestheader = |
c50f7fb2 | 1202 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1203 | |
c50f7fb2 | 1204 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
1205 | gpadl_teardown = |
1206 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 1207 | |
c50f7fb2 HZ |
1208 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
1209 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 1210 | gpadl_torndown, |
9568a193 S |
1211 | sizeof( |
1212 | struct vmbus_channel_gpadl_torndown)); | |
1213 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1214 | break; |
1215 | } | |
1216 | } | |
1217 | } | |
15b2f647 | 1218 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1219 | } |
1220 | ||
3e189519 | 1221 | /* |
e98cb276 | 1222 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1223 | * |
1224 | * This is invoked when we received a response to our initiate contact request. | |
1225 | * Find the matching request, copy the response and signal the requesting | |
1226 | * thread. | |
1227 | */ | |
e98cb276 | 1228 | static void vmbus_onversion_response( |
bd60c33e | 1229 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1230 | { |
188963ec HZ |
1231 | struct vmbus_channel_msginfo *msginfo; |
1232 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1233 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1234 | unsigned long flags; |
3e7ee490 | 1235 | |
188963ec | 1236 | version_response = (struct vmbus_channel_version_response *)hdr; |
c7924fb0 VK |
1237 | |
1238 | trace_vmbus_onversion_response(version_response); | |
1239 | ||
15b2f647 | 1240 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1241 | |
ebb61e5f HJ |
1242 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1243 | msglistentry) { | |
188963ec | 1244 | requestheader = |
c50f7fb2 | 1245 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1246 | |
c50f7fb2 HZ |
1247 | if (requestheader->msgtype == |
1248 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1249 | memcpy(&msginfo->response.version_response, |
188963ec | 1250 | version_response, |
bd60c33e | 1251 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1252 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1253 | } |
1254 | } | |
15b2f647 | 1255 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1256 | } |
1257 | ||
c8212f04 | 1258 | /* Channel message dispatch table */ |
e6242fa0 SH |
1259 | const struct vmbus_channel_message_table_entry |
1260 | channel_message_table[CHANNELMSG_COUNT] = { | |
1261 | { CHANNELMSG_INVALID, 0, NULL }, | |
1262 | { CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer }, | |
1263 | { CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind }, | |
1264 | { CHANNELMSG_REQUESTOFFERS, 0, NULL }, | |
1265 | { CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered }, | |
1266 | { CHANNELMSG_OPENCHANNEL, 0, NULL }, | |
1267 | { CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result }, | |
1268 | { CHANNELMSG_CLOSECHANNEL, 0, NULL }, | |
1269 | { CHANNELMSG_GPADL_HEADER, 0, NULL }, | |
1270 | { CHANNELMSG_GPADL_BODY, 0, NULL }, | |
1271 | { CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created }, | |
1272 | { CHANNELMSG_GPADL_TEARDOWN, 0, NULL }, | |
1273 | { CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown }, | |
1274 | { CHANNELMSG_RELID_RELEASED, 0, NULL }, | |
1275 | { CHANNELMSG_INITIATE_CONTACT, 0, NULL }, | |
1276 | { CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response }, | |
1277 | { CHANNELMSG_UNLOAD, 0, NULL }, | |
1278 | { CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response }, | |
1279 | { CHANNELMSG_18, 0, NULL }, | |
1280 | { CHANNELMSG_19, 0, NULL }, | |
1281 | { CHANNELMSG_20, 0, NULL }, | |
1282 | { CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL }, | |
c8212f04 GKH |
1283 | }; |
1284 | ||
3e189519 | 1285 | /* |
e98cb276 | 1286 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1287 | * |
1288 | * This is invoked in the vmbus worker thread context. | |
1289 | */ | |
e98cb276 | 1290 | void vmbus_onmessage(void *context) |
3e7ee490 | 1291 | { |
188963ec | 1292 | struct hv_message *msg = context; |
82250213 | 1293 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1294 | int size; |
1295 | ||
f6feebe0 HZ |
1296 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1297 | size = msg->header.payload_size; | |
3e7ee490 | 1298 | |
716fa52f VK |
1299 | trace_vmbus_on_message(hdr); |
1300 | ||
c50f7fb2 | 1301 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1302 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1303 | hdr->msgtype, size); |
04f50c4d | 1304 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1305 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1306 | return; |
1307 | } | |
1308 | ||
b7c6b02f S |
1309 | if (channel_message_table[hdr->msgtype].message_handler) |
1310 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1311 | else |
0a46618d | 1312 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1313 | } |
1314 | ||
3e189519 | 1315 | /* |
e98cb276 | 1316 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1317 | */ |
e98cb276 | 1318 | int vmbus_request_offers(void) |
3e7ee490 | 1319 | { |
82250213 | 1320 | struct vmbus_channel_message_header *msg; |
188963ec | 1321 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1322 | int ret; |
3e7ee490 | 1323 | |
188963ec | 1324 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1325 | sizeof(struct vmbus_channel_message_header), |
1326 | GFP_KERNEL); | |
188963ec | 1327 | if (!msginfo) |
75910f23 | 1328 | return -ENOMEM; |
3e7ee490 | 1329 | |
c50f7fb2 | 1330 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1331 | |
c50f7fb2 | 1332 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1333 | |
c0bb0392 VK |
1334 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_message_header), |
1335 | true); | |
d6706e63 VK |
1336 | |
1337 | trace_vmbus_request_offers(ret); | |
1338 | ||
bd60c33e | 1339 | if (ret != 0) { |
0a46618d | 1340 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1341 | |
0c3b7b2f S |
1342 | goto cleanup; |
1343 | } | |
3e7ee490 | 1344 | |
0c3b7b2f | 1345 | cleanup: |
dd9b15dc | 1346 | kfree(msginfo); |
3e7ee490 | 1347 | |
3e7ee490 HJ |
1348 | return ret; |
1349 | } | |
1350 | ||
e68d2971 S |
1351 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) |
1352 | { | |
1353 | struct list_head *cur, *tmp; | |
1354 | struct vmbus_channel *cur_channel; | |
1355 | ||
1356 | if (primary_channel->sc_creation_callback == NULL) | |
1357 | return; | |
1358 | ||
1359 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1360 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1361 | ||
1362 | primary_channel->sc_creation_callback(cur_channel); | |
1363 | } | |
1364 | } | |
1365 | ||
1366 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1367 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1368 | { | |
1369 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1370 | } | |
1371 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1372 | ||
1373 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1374 | { | |
1375 | bool ret; | |
1376 | ||
1377 | ret = !list_empty(&primary->sc_list); | |
1378 | ||
1379 | if (ret) { | |
1380 | /* | |
1381 | * Invoke the callback on sub-channel creation. | |
1382 | * This will present a uniform interface to the | |
1383 | * clients. | |
1384 | */ | |
1385 | invoke_sc_cb(primary); | |
1386 | } | |
1387 | ||
1388 | return ret; | |
1389 | } | |
1390 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1391 | |
1392 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1393 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1394 | { | |
1395 | channel->chn_rescind_callback = chn_rescind_cb; | |
1396 | } | |
1397 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |