Commit | Line | Data |
---|---|---|
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> |
3f335ea2 | 34 | |
0f2a6619 | 35 | #include "hyperv_vmbus.h" |
3e7ee490 | 36 | |
7047f17d S |
37 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type); |
38 | ||
39 | static const struct vmbus_device vmbus_devs[] = { | |
40 | /* IDE */ | |
41 | { .dev_type = HV_IDE, | |
42 | HV_IDE_GUID, | |
43 | .perf_device = true, | |
44 | }, | |
45 | ||
46 | /* SCSI */ | |
47 | { .dev_type = HV_SCSI, | |
48 | HV_SCSI_GUID, | |
49 | .perf_device = true, | |
50 | }, | |
51 | ||
52 | /* Fibre Channel */ | |
53 | { .dev_type = HV_FC, | |
54 | HV_SYNTHFC_GUID, | |
55 | .perf_device = true, | |
56 | }, | |
57 | ||
58 | /* Synthetic NIC */ | |
59 | { .dev_type = HV_NIC, | |
60 | HV_NIC_GUID, | |
61 | .perf_device = true, | |
62 | }, | |
63 | ||
64 | /* Network Direct */ | |
65 | { .dev_type = HV_ND, | |
66 | HV_ND_GUID, | |
67 | .perf_device = true, | |
68 | }, | |
69 | ||
70 | /* PCIE */ | |
71 | { .dev_type = HV_PCIE, | |
72 | HV_PCIE_GUID, | |
73 | .perf_device = true, | |
74 | }, | |
75 | ||
76 | /* Synthetic Frame Buffer */ | |
77 | { .dev_type = HV_FB, | |
78 | HV_SYNTHVID_GUID, | |
79 | .perf_device = false, | |
80 | }, | |
81 | ||
82 | /* Synthetic Keyboard */ | |
83 | { .dev_type = HV_KBD, | |
84 | HV_KBD_GUID, | |
85 | .perf_device = false, | |
86 | }, | |
87 | ||
88 | /* Synthetic MOUSE */ | |
89 | { .dev_type = HV_MOUSE, | |
90 | HV_MOUSE_GUID, | |
91 | .perf_device = false, | |
92 | }, | |
93 | ||
94 | /* KVP */ | |
95 | { .dev_type = HV_KVP, | |
96 | HV_KVP_GUID, | |
97 | .perf_device = false, | |
98 | }, | |
99 | ||
100 | /* Time Synch */ | |
101 | { .dev_type = HV_TS, | |
102 | HV_TS_GUID, | |
103 | .perf_device = false, | |
104 | }, | |
105 | ||
106 | /* Heartbeat */ | |
107 | { .dev_type = HV_HB, | |
108 | HV_HEART_BEAT_GUID, | |
109 | .perf_device = false, | |
110 | }, | |
111 | ||
112 | /* Shutdown */ | |
113 | { .dev_type = HV_SHUTDOWN, | |
114 | HV_SHUTDOWN_GUID, | |
115 | .perf_device = false, | |
116 | }, | |
117 | ||
118 | /* File copy */ | |
119 | { .dev_type = HV_FCOPY, | |
120 | HV_FCOPY_GUID, | |
121 | .perf_device = false, | |
122 | }, | |
123 | ||
124 | /* Backup */ | |
125 | { .dev_type = HV_BACKUP, | |
126 | HV_VSS_GUID, | |
127 | .perf_device = false, | |
128 | }, | |
129 | ||
130 | /* Dynamic Memory */ | |
131 | { .dev_type = HV_DM, | |
132 | HV_DM_GUID, | |
133 | .perf_device = false, | |
134 | }, | |
135 | ||
136 | /* Unknown GUID */ | |
137 | { .dev_type = HV_UNKOWN, | |
138 | .perf_device = false, | |
139 | }, | |
140 | }; | |
141 | ||
0f98829a DC |
142 | static const struct { |
143 | uuid_le guid; | |
144 | } vmbus_unsupported_devs[] = { | |
145 | { HV_AVMA1_GUID }, | |
146 | { HV_AVMA2_GUID }, | |
147 | { HV_RDV_GUID }, | |
148 | }; | |
149 | ||
150 | static bool is_unsupported_vmbus_devs(const uuid_le *guid) | |
151 | { | |
152 | int i; | |
153 | ||
154 | for (i = 0; i < ARRAY_SIZE(vmbus_unsupported_devs); i++) | |
155 | if (!uuid_le_cmp(*guid, vmbus_unsupported_devs[i].guid)) | |
156 | return true; | |
157 | return false; | |
158 | } | |
159 | ||
160 | static u16 hv_get_dev_type(const struct vmbus_channel *channel) | |
7047f17d | 161 | { |
0f98829a | 162 | const uuid_le *guid = &channel->offermsg.offer.if_type; |
7047f17d S |
163 | u16 i; |
164 | ||
0f98829a DC |
165 | if (is_hvsock_channel(channel) || is_unsupported_vmbus_devs(guid)) |
166 | return HV_UNKOWN; | |
167 | ||
7047f17d S |
168 | for (i = HV_IDE; i < HV_UNKOWN; i++) { |
169 | if (!uuid_le_cmp(*guid, vmbus_devs[i].guid)) | |
170 | return i; | |
171 | } | |
172 | pr_info("Unknown GUID: %pUl\n", guid); | |
173 | return i; | |
174 | } | |
f38e7dd7 | 175 | |
c88c4e4c | 176 | /** |
da0e9631 | 177 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
178 | * @icmsghdrp: Pointer to msg header structure |
179 | * @icmsg_negotiate: Pointer to negotiate message structure | |
180 | * @buf: Raw buffer channel data | |
181 | * | |
182 | * @icmsghdrp is of type &struct icmsg_hdr. | |
183 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
184 | * Set up and fill in default negotiate response message. |
185 | * | |
6741335b S |
186 | * The fw_version specifies the framework version that |
187 | * we can support and srv_version specifies the service | |
188 | * version we can support. | |
c88c4e4c HJ |
189 | * |
190 | * Mainly used by Hyper-V drivers. | |
191 | */ | |
6741335b | 192 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 193 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 194 | int fw_version, int srv_version) |
c88c4e4c | 195 | { |
6741335b S |
196 | int icframe_major, icframe_minor; |
197 | int icmsg_major, icmsg_minor; | |
198 | int fw_major, fw_minor; | |
199 | int srv_major, srv_minor; | |
c836d0ab | 200 | int i; |
6741335b | 201 | bool found_match = false; |
c836d0ab | 202 | |
a3605300 | 203 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
204 | fw_major = (fw_version >> 16); |
205 | fw_minor = (fw_version & 0xFFFF); | |
206 | ||
207 | srv_major = (srv_version >> 16); | |
208 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 209 | |
a3605300 S |
210 | negop = (struct icmsg_negotiate *)&buf[ |
211 | sizeof(struct vmbuspipe_hdr) + | |
212 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 213 | |
6741335b S |
214 | icframe_major = negop->icframe_vercnt; |
215 | icframe_minor = 0; | |
216 | ||
217 | icmsg_major = negop->icmsg_vercnt; | |
218 | icmsg_minor = 0; | |
c836d0ab S |
219 | |
220 | /* | |
221 | * Select the framework version number we will | |
222 | * support. | |
223 | */ | |
224 | ||
225 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
226 | if ((negop->icversion_data[i].major == fw_major) && |
227 | (negop->icversion_data[i].minor == fw_minor)) { | |
228 | icframe_major = negop->icversion_data[i].major; | |
229 | icframe_minor = negop->icversion_data[i].minor; | |
230 | found_match = true; | |
231 | } | |
c836d0ab S |
232 | } |
233 | ||
6741335b S |
234 | if (!found_match) |
235 | goto fw_error; | |
236 | ||
237 | found_match = false; | |
238 | ||
c836d0ab S |
239 | for (i = negop->icframe_vercnt; |
240 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
241 | if ((negop->icversion_data[i].major == srv_major) && |
242 | (negop->icversion_data[i].minor == srv_minor)) { | |
243 | icmsg_major = negop->icversion_data[i].major; | |
244 | icmsg_minor = negop->icversion_data[i].minor; | |
245 | found_match = true; | |
246 | } | |
c88c4e4c | 247 | } |
a3605300 | 248 | |
c836d0ab | 249 | /* |
6741335b | 250 | * Respond with the framework and service |
c836d0ab S |
251 | * version numbers we can support. |
252 | */ | |
6741335b S |
253 | |
254 | fw_error: | |
255 | if (!found_match) { | |
256 | negop->icframe_vercnt = 0; | |
257 | negop->icmsg_vercnt = 0; | |
258 | } else { | |
259 | negop->icframe_vercnt = 1; | |
260 | negop->icmsg_vercnt = 1; | |
261 | } | |
262 | ||
263 | negop->icversion_data[0].major = icframe_major; | |
264 | negop->icversion_data[0].minor = icframe_minor; | |
265 | negop->icversion_data[1].major = icmsg_major; | |
266 | negop->icversion_data[1].minor = icmsg_minor; | |
267 | return found_match; | |
c88c4e4c | 268 | } |
a3605300 | 269 | |
da0e9631 | 270 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 271 | |
3e189519 | 272 | /* |
e98cb276 | 273 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 274 | */ |
50fe56d2 | 275 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 276 | { |
aded7165 | 277 | struct vmbus_channel *channel; |
3e7ee490 | 278 | |
aded7165 | 279 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 280 | if (!channel) |
3e7ee490 | 281 | return NULL; |
3e7ee490 | 282 | |
fe760e4d | 283 | channel->acquire_ring_lock = true; |
54411c42 | 284 | spin_lock_init(&channel->inbound_lock); |
67fae053 | 285 | spin_lock_init(&channel->lock); |
e68d2971 S |
286 | |
287 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 288 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 289 | |
3e7ee490 HJ |
290 | return channel; |
291 | } | |
292 | ||
3e189519 | 293 | /* |
e98cb276 | 294 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 295 | */ |
9f3e28e3 | 296 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 297 | { |
aadc3780 | 298 | kfree(channel); |
3e7ee490 HJ |
299 | } |
300 | ||
3a28fa35 S |
301 | static void percpu_channel_enq(void *arg) |
302 | { | |
303 | struct vmbus_channel *channel = arg; | |
304 | int cpu = smp_processor_id(); | |
305 | ||
306 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
307 | } | |
8b5d6d3b | 308 | |
3a28fa35 S |
309 | static void percpu_channel_deq(void *arg) |
310 | { | |
311 | struct vmbus_channel *channel = arg; | |
312 | ||
313 | list_del(&channel->percpu_list); | |
314 | } | |
8b5d6d3b | 315 | |
ed6cfcc5 | 316 | |
f52078cf | 317 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 318 | { |
ed6cfcc5 | 319 | struct vmbus_channel_relid_released msg; |
4b2f9abe | 320 | |
c8705979 | 321 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 322 | msg.child_relid = relid; |
c8705979 S |
323 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
324 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
f52078cf | 325 | } |
c8705979 | 326 | |
638fea33 DC |
327 | void hv_event_tasklet_disable(struct vmbus_channel *channel) |
328 | { | |
329 | struct tasklet_struct *tasklet; | |
330 | tasklet = hv_context.event_dpc[channel->target_cpu]; | |
331 | tasklet_disable(tasklet); | |
332 | } | |
333 | ||
334 | void hv_event_tasklet_enable(struct vmbus_channel *channel) | |
335 | { | |
336 | struct tasklet_struct *tasklet; | |
337 | tasklet = hv_context.event_dpc[channel->target_cpu]; | |
338 | tasklet_enable(tasklet); | |
339 | ||
340 | /* In case there is any pending event */ | |
341 | tasklet_schedule(tasklet); | |
342 | } | |
343 | ||
f52078cf DC |
344 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) |
345 | { | |
346 | unsigned long flags; | |
347 | struct vmbus_channel *primary_channel; | |
348 | ||
34c6801e | 349 | BUG_ON(!channel->rescind); |
85d9aa70 | 350 | BUG_ON(!mutex_is_locked(&vmbus_connection.channel_mutex)); |
34c6801e | 351 | |
638fea33 | 352 | hv_event_tasklet_disable(channel); |
2115b561 S |
353 | if (channel->target_cpu != get_cpu()) { |
354 | put_cpu(); | |
3a28fa35 S |
355 | smp_call_function_single(channel->target_cpu, |
356 | percpu_channel_deq, channel, true); | |
2115b561 | 357 | } else { |
3a28fa35 | 358 | percpu_channel_deq(channel); |
2115b561 S |
359 | put_cpu(); |
360 | } | |
638fea33 | 361 | hv_event_tasklet_enable(channel); |
3a28fa35 | 362 | |
e68d2971 | 363 | if (channel->primary_channel == NULL) { |
e68d2971 | 364 | list_del(&channel->listentry); |
ca1c4b74 DC |
365 | |
366 | primary_channel = channel; | |
e68d2971 S |
367 | } else { |
368 | primary_channel = channel->primary_channel; | |
67fae053 | 369 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 370 | list_del(&channel->sc_list); |
357e836a | 371 | primary_channel->num_sc--; |
67fae053 | 372 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 373 | } |
ca1c4b74 DC |
374 | |
375 | /* | |
376 | * We need to free the bit for init_vp_index() to work in the case | |
377 | * of sub-channel, when we reload drivers like hv_netvsc. | |
378 | */ | |
509879bd S |
379 | if (channel->affinity_policy == HV_LOCALIZED) |
380 | cpumask_clear_cpu(channel->target_cpu, | |
381 | &primary_channel->alloced_cpus_in_node); | |
ca1c4b74 | 382 | |
638fea33 DC |
383 | vmbus_release_relid(relid); |
384 | ||
c8705979 | 385 | free_channel(channel); |
4b2f9abe | 386 | } |
8b5d6d3b | 387 | |
93e5bd06 S |
388 | void vmbus_free_channels(void) |
389 | { | |
813c5b79 DC |
390 | struct vmbus_channel *channel, *tmp; |
391 | ||
392 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
393 | listentry) { | |
34c6801e | 394 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 395 | channel->rescind = true; |
93e5bd06 | 396 | |
93e5bd06 | 397 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
398 | } |
399 | } | |
400 | ||
3e189519 | 401 | /* |
e98cb276 | 402 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 403 | * associated with this offer |
bd60c33e | 404 | */ |
2dd37cb8 | 405 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 406 | { |
aded7165 | 407 | struct vmbus_channel *channel; |
188963ec | 408 | bool fnew = true; |
0f5e44ca | 409 | unsigned long flags; |
7047f17d | 410 | u16 dev_type; |
85d9aa70 | 411 | int ret; |
3e7ee490 | 412 | |
454f18a9 | 413 | /* Make sure this is a new offer */ |
d6f591e3 | 414 | mutex_lock(&vmbus_connection.channel_mutex); |
3e7ee490 | 415 | |
da9fcb72 | 416 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
417 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
418 | newchannel->offermsg.offer.if_type) && | |
419 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
420 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 421 | fnew = false; |
3e7ee490 HJ |
422 | break; |
423 | } | |
424 | } | |
425 | ||
8dfd3326 | 426 | if (fnew) |
c50f7fb2 | 427 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 428 | &vmbus_connection.chn_list); |
bd60c33e | 429 | |
d6f591e3 | 430 | mutex_unlock(&vmbus_connection.channel_mutex); |
3e7ee490 | 431 | |
188963ec | 432 | if (!fnew) { |
e68d2971 S |
433 | /* |
434 | * Check to see if this is a sub-channel. | |
435 | */ | |
436 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
437 | /* | |
438 | * Process the sub-channel. | |
439 | */ | |
440 | newchannel->primary_channel = channel; | |
67fae053 | 441 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 442 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 443 | channel->num_sc++; |
357e836a | 444 | spin_unlock_irqrestore(&channel->lock, flags); |
8dfd3326 VK |
445 | } else |
446 | goto err_free_chan; | |
447 | } | |
e68d2971 | 448 | |
0f98829a | 449 | dev_type = hv_get_dev_type(newchannel); |
ccef9bcc S |
450 | if (dev_type == HV_NIC) |
451 | set_channel_signal_state(newchannel, HV_SIGNAL_POLICY_EXPLICIT); | |
7047f17d S |
452 | |
453 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 454 | |
638fea33 | 455 | hv_event_tasklet_disable(newchannel); |
8dfd3326 VK |
456 | if (newchannel->target_cpu != get_cpu()) { |
457 | put_cpu(); | |
458 | smp_call_function_single(newchannel->target_cpu, | |
459 | percpu_channel_enq, | |
460 | newchannel, true); | |
461 | } else { | |
462 | percpu_channel_enq(newchannel); | |
463 | put_cpu(); | |
3e7ee490 | 464 | } |
638fea33 | 465 | hv_event_tasklet_enable(newchannel); |
3e7ee490 | 466 | |
42dceebe S |
467 | /* |
468 | * This state is used to indicate a successful open | |
469 | * so that when we do close the channel normally, we | |
470 | * can cleanup properly | |
471 | */ | |
472 | newchannel->state = CHANNEL_OPEN_STATE; | |
473 | ||
8dfd3326 VK |
474 | if (!fnew) { |
475 | if (channel->sc_creation_callback != NULL) | |
476 | channel->sc_creation_callback(newchannel); | |
477 | return; | |
478 | } | |
479 | ||
bd60c33e GKH |
480 | /* |
481 | * Start the process of binding this offer to the driver | |
482 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 483 | * vmbus_child_dev_add() |
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 DC |
498 | mutex_lock(&vmbus_connection.channel_mutex); |
499 | ret = vmbus_device_register(newchannel->device_obj); | |
500 | mutex_unlock(&vmbus_connection.channel_mutex); | |
501 | ||
502 | if (ret != 0) { | |
d43e2fe7 DC |
503 | pr_err("unable to add child device object (relid %d)\n", |
504 | newchannel->offermsg.child_relid); | |
505 | kfree(newchannel->device_obj); | |
506 | goto err_deq_chan; | |
507 | } | |
9c3a6f7e | 508 | return; |
2dd37cb8 | 509 | |
5b1e5b53 | 510 | err_deq_chan: |
d6f591e3 | 511 | mutex_lock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 512 | list_del(&newchannel->listentry); |
d6f591e3 | 513 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 514 | |
638fea33 | 515 | hv_event_tasklet_disable(newchannel); |
5b1e5b53 S |
516 | if (newchannel->target_cpu != get_cpu()) { |
517 | put_cpu(); | |
518 | smp_call_function_single(newchannel->target_cpu, | |
519 | percpu_channel_deq, newchannel, true); | |
520 | } else { | |
521 | percpu_channel_deq(newchannel); | |
522 | put_cpu(); | |
523 | } | |
638fea33 DC |
524 | hv_event_tasklet_enable(newchannel); |
525 | ||
526 | vmbus_release_relid(newchannel->offermsg.child_relid); | |
5b1e5b53 | 527 | |
9c3a6f7e VK |
528 | err_free_chan: |
529 | free_channel(newchannel); | |
3e7ee490 HJ |
530 | } |
531 | ||
a119845f S |
532 | /* |
533 | * We use this state to statically distribute the channel interrupt load. | |
534 | */ | |
1f656ff3 | 535 | static int next_numa_node_id; |
a119845f S |
536 | |
537 | /* | |
538 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 S |
539 | * channel interrupt load by binding a channel to VCPU. |
540 | * We do this in a hierarchical fashion: | |
541 | * First distribute the primary channels across available NUMA nodes | |
542 | * and then distribute the subchannels amongst the CPUs in the NUMA | |
543 | * node assigned to the primary channel. | |
544 | * | |
545 | * For pre-win8 hosts or non-performance critical channels we assign the | |
546 | * first CPU in the first NUMA node. | |
a119845f | 547 | */ |
7047f17d | 548 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
549 | { |
550 | u32 cur_cpu; | |
7047f17d | 551 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
552 | struct vmbus_channel *primary = channel->primary_channel; |
553 | int next_node; | |
554 | struct cpumask available_mask; | |
9f01ec53 | 555 | struct cpumask *alloced_mask; |
a119845f | 556 | |
a119845f S |
557 | if ((vmbus_proto_version == VERSION_WS2008) || |
558 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
559 | /* | |
560 | * Prior to win8, all channel interrupts are | |
561 | * delivered on cpu 0. | |
562 | * Also if the channel is not a performance critical | |
563 | * channel, bind it to cpu 0. | |
564 | */ | |
1f656ff3 | 565 | channel->numa_node = 0; |
d3ba720d | 566 | channel->target_cpu = 0; |
9c6e64ad | 567 | channel->target_vp = hv_context.vp_index[0]; |
d3ba720d | 568 | return; |
a119845f | 569 | } |
ce59fec8 VK |
570 | |
571 | /* | |
509879bd S |
572 | * Based on the channel affinity policy, we will assign the NUMA |
573 | * nodes. | |
ce59fec8 | 574 | */ |
509879bd S |
575 | |
576 | if ((channel->affinity_policy == HV_BALANCED) || (!primary)) { | |
1f656ff3 S |
577 | while (true) { |
578 | next_node = next_numa_node_id++; | |
509879bd | 579 | if (next_node == nr_node_ids) { |
1f656ff3 | 580 | next_node = next_numa_node_id = 0; |
509879bd S |
581 | continue; |
582 | } | |
1f656ff3 S |
583 | if (cpumask_empty(cpumask_of_node(next_node))) |
584 | continue; | |
585 | break; | |
586 | } | |
587 | channel->numa_node = next_node; | |
588 | primary = channel; | |
589 | } | |
9f01ec53 | 590 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 591 | |
9f01ec53 | 592 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 593 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 594 | /* |
1f656ff3 S |
595 | * We have cycled through all the CPUs in the node; |
596 | * reset the alloced map. | |
ce59fec8 | 597 | */ |
9f01ec53 | 598 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
599 | } |
600 | ||
9f01ec53 | 601 | cpumask_xor(&available_mask, alloced_mask, |
1f656ff3 S |
602 | cpumask_of_node(primary->numa_node)); |
603 | ||
3b71107d | 604 | cur_cpu = -1; |
79fd8e70 | 605 | |
509879bd S |
606 | if (primary->affinity_policy == HV_LOCALIZED) { |
607 | /* | |
608 | * Normally Hyper-V host doesn't create more subchannels | |
609 | * than there are VCPUs on the node but it is possible when not | |
610 | * all present VCPUs on the node are initialized by guest. | |
611 | * Clear the alloced_cpus_in_node to start over. | |
612 | */ | |
613 | if (cpumask_equal(&primary->alloced_cpus_in_node, | |
614 | cpumask_of_node(primary->numa_node))) | |
615 | cpumask_clear(&primary->alloced_cpus_in_node); | |
616 | } | |
79fd8e70 | 617 | |
3b71107d DC |
618 | while (true) { |
619 | cur_cpu = cpumask_next(cur_cpu, &available_mask); | |
620 | if (cur_cpu >= nr_cpu_ids) { | |
621 | cur_cpu = -1; | |
622 | cpumask_copy(&available_mask, | |
623 | cpumask_of_node(primary->numa_node)); | |
624 | continue; | |
625 | } | |
626 | ||
509879bd S |
627 | if (primary->affinity_policy == HV_LOCALIZED) { |
628 | /* | |
629 | * NOTE: in the case of sub-channel, we clear the | |
630 | * sub-channel related bit(s) in | |
631 | * primary->alloced_cpus_in_node in | |
632 | * hv_process_channel_removal(), so when we | |
633 | * reload drivers like hv_netvsc in SMP guest, here | |
634 | * we're able to re-allocate | |
635 | * bit from primary->alloced_cpus_in_node. | |
636 | */ | |
637 | if (!cpumask_test_cpu(cur_cpu, | |
638 | &primary->alloced_cpus_in_node)) { | |
639 | cpumask_set_cpu(cur_cpu, | |
640 | &primary->alloced_cpus_in_node); | |
641 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
642 | break; | |
643 | } | |
644 | } else { | |
3b71107d DC |
645 | cpumask_set_cpu(cur_cpu, alloced_mask); |
646 | break; | |
647 | } | |
648 | } | |
1f656ff3 | 649 | |
d3ba720d S |
650 | channel->target_cpu = cur_cpu; |
651 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
652 | } |
653 | ||
41571916 VK |
654 | static void vmbus_wait_for_unload(void) |
655 | { | |
cd95aad5 VK |
656 | int cpu; |
657 | void *page_addr; | |
658 | struct hv_message *msg; | |
41571916 | 659 | struct vmbus_channel_message_header *hdr; |
cd95aad5 | 660 | u32 message_type; |
41571916 | 661 | |
cd95aad5 VK |
662 | /* |
663 | * CHANNELMSG_UNLOAD_RESPONSE is always delivered to the CPU which was | |
664 | * used for initial contact or to CPU0 depending on host version. When | |
665 | * we're crashing on a different CPU let's hope that IRQ handler on | |
666 | * the cpu which receives CHANNELMSG_UNLOAD_RESPONSE is still | |
667 | * functional and vmbus_unload_response() will complete | |
668 | * vmbus_connection.unload_event. If not, the last thing we can do is | |
669 | * read message pages for all CPUs directly. | |
670 | */ | |
41571916 | 671 | while (1) { |
cd95aad5 VK |
672 | if (completion_done(&vmbus_connection.unload_event)) |
673 | break; | |
41571916 | 674 | |
cd95aad5 VK |
675 | for_each_online_cpu(cpu) { |
676 | page_addr = hv_context.synic_message_page[cpu]; | |
677 | msg = (struct hv_message *)page_addr + | |
678 | VMBUS_MESSAGE_SINT; | |
41571916 | 679 | |
cd95aad5 VK |
680 | message_type = READ_ONCE(msg->header.message_type); |
681 | if (message_type == HVMSG_NONE) | |
682 | continue; | |
41571916 | 683 | |
cd95aad5 VK |
684 | hdr = (struct vmbus_channel_message_header *) |
685 | msg->u.payload; | |
686 | ||
687 | if (hdr->msgtype == CHANNELMSG_UNLOAD_RESPONSE) | |
688 | complete(&vmbus_connection.unload_event); | |
689 | ||
690 | vmbus_signal_eom(msg, message_type); | |
691 | } | |
692 | ||
693 | mdelay(10); | |
694 | } | |
695 | ||
696 | /* | |
697 | * We're crashing and already got the UNLOAD_RESPONSE, cleanup all | |
698 | * maybe-pending messages on all CPUs to be able to receive new | |
699 | * messages after we reconnect. | |
700 | */ | |
701 | for_each_online_cpu(cpu) { | |
702 | page_addr = hv_context.synic_message_page[cpu]; | |
703 | msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; | |
704 | msg->header.message_type = HVMSG_NONE; | |
41571916 VK |
705 | } |
706 | } | |
707 | ||
2db84eff S |
708 | /* |
709 | * vmbus_unload_response - Handler for the unload response. | |
710 | */ | |
711 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
712 | { | |
713 | /* | |
714 | * This is a global event; just wakeup the waiting thread. | |
715 | * Once we successfully unload, we can cleanup the monitor state. | |
716 | */ | |
717 | complete(&vmbus_connection.unload_event); | |
718 | } | |
719 | ||
75ff3a8a | 720 | void vmbus_initiate_unload(bool crash) |
2db84eff S |
721 | { |
722 | struct vmbus_channel_message_header hdr; | |
723 | ||
4a54243f VK |
724 | /* Pre-Win2012R2 hosts don't support reconnect */ |
725 | if (vmbus_proto_version < VERSION_WIN8_1) | |
726 | return; | |
727 | ||
2db84eff S |
728 | init_completion(&vmbus_connection.unload_event); |
729 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
730 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
731 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header)); | |
732 | ||
41571916 VK |
733 | /* |
734 | * vmbus_initiate_unload() is also called on crash and the crash can be | |
735 | * happening in an interrupt context, where scheduling is impossible. | |
736 | */ | |
75ff3a8a | 737 | if (!crash) |
41571916 VK |
738 | wait_for_completion(&vmbus_connection.unload_event); |
739 | else | |
740 | vmbus_wait_for_unload(); | |
2db84eff S |
741 | } |
742 | ||
3e189519 | 743 | /* |
e98cb276 | 744 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 745 | * |
bd60c33e | 746 | */ |
e98cb276 | 747 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 748 | { |
bd60c33e | 749 | struct vmbus_channel_offer_channel *offer; |
188963ec | 750 | struct vmbus_channel *newchannel; |
3e7ee490 | 751 | |
bd60c33e | 752 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 753 | |
454f18a9 | 754 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 755 | newchannel = alloc_channel(); |
188963ec | 756 | if (!newchannel) { |
0a46618d | 757 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
758 | return; |
759 | } | |
760 | ||
132368bd S |
761 | /* |
762 | * By default we setup state to enable batched | |
763 | * reading. A specific service can choose to | |
764 | * disable this prior to opening the channel. | |
765 | */ | |
766 | newchannel->batched_reading = true; | |
767 | ||
b3bf60c7 S |
768 | /* |
769 | * Setup state for signalling the host. | |
770 | */ | |
771 | newchannel->sig_event = (struct hv_input_signal_event *) | |
772 | (ALIGN((unsigned long) | |
773 | &newchannel->sig_buf, | |
774 | HV_HYPERCALL_PARAM_ALIGN)); | |
775 | ||
776 | newchannel->sig_event->connectionid.asu32 = 0; | |
777 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
778 | newchannel->sig_event->flag_number = 0; | |
779 | newchannel->sig_event->rsvdz = 0; | |
780 | ||
781 | if (vmbus_proto_version != VERSION_WS2008) { | |
782 | newchannel->is_dedicated_interrupt = | |
783 | (offer->is_dedicated_interrupt != 0); | |
784 | newchannel->sig_event->connectionid.u.id = | |
785 | offer->connection_id; | |
786 | } | |
787 | ||
c50f7fb2 | 788 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 789 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
790 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
791 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 792 | |
2dd37cb8 | 793 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
794 | } |
795 | ||
3e189519 | 796 | /* |
e98cb276 | 797 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
798 | * |
799 | * We queue a work item to process this offer synchronously | |
800 | */ | |
e98cb276 | 801 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 802 | { |
bd60c33e | 803 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 804 | struct vmbus_channel *channel; |
d43e2fe7 DC |
805 | unsigned long flags; |
806 | struct device *dev; | |
3e7ee490 | 807 | |
bd60c33e | 808 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
85d9aa70 DC |
809 | |
810 | mutex_lock(&vmbus_connection.channel_mutex); | |
d43e2fe7 | 811 | channel = relid2channel(rescind->child_relid); |
98e08702 | 812 | |
2dd37cb8 | 813 | if (channel == NULL) { |
f52078cf DC |
814 | /* |
815 | * This is very impossible, because in | |
816 | * vmbus_process_offer(), we have already invoked | |
817 | * vmbus_release_relid() on error. | |
818 | */ | |
85d9aa70 | 819 | goto out; |
2dd37cb8 | 820 | } |
3e7ee490 | 821 | |
d43e2fe7 DC |
822 | spin_lock_irqsave(&channel->lock, flags); |
823 | channel->rescind = true; | |
824 | spin_unlock_irqrestore(&channel->lock, flags); | |
825 | ||
826 | if (channel->device_obj) { | |
499e8401 DC |
827 | if (channel->chn_rescind_callback) { |
828 | channel->chn_rescind_callback(channel); | |
85d9aa70 | 829 | goto out; |
499e8401 | 830 | } |
d43e2fe7 DC |
831 | /* |
832 | * We will have to unregister this device from the | |
833 | * driver core. | |
834 | */ | |
835 | dev = get_device(&channel->device_obj->device); | |
836 | if (dev) { | |
837 | vmbus_device_unregister(channel->device_obj); | |
838 | put_device(dev); | |
839 | } | |
840 | } else { | |
841 | hv_process_channel_removal(channel, | |
842 | channel->offermsg.child_relid); | |
2dd37cb8 | 843 | } |
85d9aa70 DC |
844 | |
845 | out: | |
846 | mutex_unlock(&vmbus_connection.channel_mutex); | |
847 | } | |
848 | ||
849 | void vmbus_hvsock_device_unregister(struct vmbus_channel *channel) | |
850 | { | |
851 | mutex_lock(&vmbus_connection.channel_mutex); | |
852 | ||
853 | BUG_ON(!is_hvsock_channel(channel)); | |
854 | ||
855 | channel->rescind = true; | |
856 | vmbus_device_unregister(channel->device_obj); | |
857 | ||
858 | mutex_unlock(&vmbus_connection.channel_mutex); | |
3e7ee490 | 859 | } |
85d9aa70 DC |
860 | EXPORT_SYMBOL_GPL(vmbus_hvsock_device_unregister); |
861 | ||
3e7ee490 | 862 | |
3e189519 | 863 | /* |
e98cb276 HZ |
864 | * vmbus_onoffers_delivered - |
865 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
866 | * |
867 | * Nothing to do here. | |
868 | */ | |
e98cb276 | 869 | static void vmbus_onoffers_delivered( |
bd60c33e | 870 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 871 | { |
3e7ee490 HJ |
872 | } |
873 | ||
3e189519 | 874 | /* |
e98cb276 | 875 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
876 | * |
877 | * This is invoked when we received a response to our channel open request. | |
878 | * Find the matching request, copy the response and signal the requesting | |
879 | * thread. | |
880 | */ | |
e98cb276 | 881 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 882 | { |
bd60c33e | 883 | struct vmbus_channel_open_result *result; |
188963ec HZ |
884 | struct vmbus_channel_msginfo *msginfo; |
885 | struct vmbus_channel_message_header *requestheader; | |
886 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 887 | unsigned long flags; |
3e7ee490 | 888 | |
bd60c33e | 889 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 890 | |
bd60c33e GKH |
891 | /* |
892 | * Find the open msg, copy the result and signal/unblock the wait event | |
893 | */ | |
15b2f647 | 894 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 895 | |
ebb61e5f HJ |
896 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
897 | msglistentry) { | |
188963ec | 898 | requestheader = |
c50f7fb2 | 899 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 900 | |
c50f7fb2 | 901 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 902 | openmsg = |
c50f7fb2 HZ |
903 | (struct vmbus_channel_open_channel *)msginfo->msg; |
904 | if (openmsg->child_relid == result->child_relid && | |
905 | openmsg->openid == result->openid) { | |
906 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 907 | result, |
9568a193 S |
908 | sizeof( |
909 | struct vmbus_channel_open_result)); | |
910 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
911 | break; |
912 | } | |
913 | } | |
914 | } | |
15b2f647 | 915 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
916 | } |
917 | ||
3e189519 | 918 | /* |
e98cb276 | 919 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
920 | * |
921 | * This is invoked when we received a response to our gpadl create request. | |
922 | * Find the matching request, copy the response and signal the requesting | |
923 | * thread. | |
924 | */ | |
e98cb276 | 925 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 926 | { |
188963ec | 927 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
928 | struct vmbus_channel_msginfo *msginfo; |
929 | struct vmbus_channel_message_header *requestheader; | |
930 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 931 | unsigned long flags; |
3e7ee490 | 932 | |
188963ec | 933 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 934 | |
bd60c33e GKH |
935 | /* |
936 | * Find the establish msg, copy the result and signal/unblock the wait | |
937 | * event | |
938 | */ | |
15b2f647 | 939 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 940 | |
ebb61e5f HJ |
941 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
942 | msglistentry) { | |
188963ec | 943 | requestheader = |
c50f7fb2 | 944 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 945 | |
c50f7fb2 | 946 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
947 | gpadlheader = |
948 | (struct vmbus_channel_gpadl_header *)requestheader; | |
949 | ||
c50f7fb2 HZ |
950 | if ((gpadlcreated->child_relid == |
951 | gpadlheader->child_relid) && | |
952 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
953 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 954 | gpadlcreated, |
9568a193 S |
955 | sizeof( |
956 | struct vmbus_channel_gpadl_created)); | |
957 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
958 | break; |
959 | } | |
960 | } | |
961 | } | |
15b2f647 | 962 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
963 | } |
964 | ||
3e189519 | 965 | /* |
e98cb276 | 966 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
967 | * |
968 | * This is invoked when we received a response to our gpadl teardown request. | |
969 | * Find the matching request, copy the response and signal the requesting | |
970 | * thread. | |
971 | */ | |
e98cb276 | 972 | static void vmbus_ongpadl_torndown( |
bd60c33e | 973 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 974 | { |
188963ec | 975 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
976 | struct vmbus_channel_msginfo *msginfo; |
977 | struct vmbus_channel_message_header *requestheader; | |
978 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 979 | unsigned long flags; |
3e7ee490 | 980 | |
188963ec | 981 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
982 | |
983 | /* | |
984 | * Find the open msg, copy the result and signal/unblock the wait event | |
985 | */ | |
15b2f647 | 986 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 987 | |
ebb61e5f HJ |
988 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
989 | msglistentry) { | |
188963ec | 990 | requestheader = |
c50f7fb2 | 991 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 992 | |
c50f7fb2 | 993 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
994 | gpadl_teardown = |
995 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 996 | |
c50f7fb2 HZ |
997 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
998 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 999 | gpadl_torndown, |
9568a193 S |
1000 | sizeof( |
1001 | struct vmbus_channel_gpadl_torndown)); | |
1002 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
1003 | break; |
1004 | } | |
1005 | } | |
1006 | } | |
15b2f647 | 1007 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1008 | } |
1009 | ||
3e189519 | 1010 | /* |
e98cb276 | 1011 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
1012 | * |
1013 | * This is invoked when we received a response to our initiate contact request. | |
1014 | * Find the matching request, copy the response and signal the requesting | |
1015 | * thread. | |
1016 | */ | |
e98cb276 | 1017 | static void vmbus_onversion_response( |
bd60c33e | 1018 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 1019 | { |
188963ec HZ |
1020 | struct vmbus_channel_msginfo *msginfo; |
1021 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 1022 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 1023 | unsigned long flags; |
3e7ee490 | 1024 | |
188963ec | 1025 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 1026 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 1027 | |
ebb61e5f HJ |
1028 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
1029 | msglistentry) { | |
188963ec | 1030 | requestheader = |
c50f7fb2 | 1031 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1032 | |
c50f7fb2 HZ |
1033 | if (requestheader->msgtype == |
1034 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 1035 | memcpy(&msginfo->response.version_response, |
188963ec | 1036 | version_response, |
bd60c33e | 1037 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 1038 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
1039 | } |
1040 | } | |
15b2f647 | 1041 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
1042 | } |
1043 | ||
c8212f04 | 1044 | /* Channel message dispatch table */ |
652594c7 | 1045 | struct vmbus_channel_message_table_entry |
b7c6b02f | 1046 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
1047 | {CHANNELMSG_INVALID, 0, NULL}, |
1048 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
1049 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
1050 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
1051 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
1052 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
1053 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
1054 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
1055 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
1056 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
1057 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
1058 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
1059 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
1060 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
1061 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
1062 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
1063 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
2db84eff | 1064 | {CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response}, |
5c23a1a5 DC |
1065 | {CHANNELMSG_18, 0, NULL}, |
1066 | {CHANNELMSG_19, 0, NULL}, | |
1067 | {CHANNELMSG_20, 0, NULL}, | |
1068 | {CHANNELMSG_TL_CONNECT_REQUEST, 0, NULL}, | |
c8212f04 GKH |
1069 | }; |
1070 | ||
3e189519 | 1071 | /* |
e98cb276 | 1072 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
1073 | * |
1074 | * This is invoked in the vmbus worker thread context. | |
1075 | */ | |
e98cb276 | 1076 | void vmbus_onmessage(void *context) |
3e7ee490 | 1077 | { |
188963ec | 1078 | struct hv_message *msg = context; |
82250213 | 1079 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
1080 | int size; |
1081 | ||
f6feebe0 HZ |
1082 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
1083 | size = msg->header.payload_size; | |
3e7ee490 | 1084 | |
c50f7fb2 | 1085 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 1086 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 1087 | hdr->msgtype, size); |
04f50c4d | 1088 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 1089 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
1090 | return; |
1091 | } | |
1092 | ||
b7c6b02f S |
1093 | if (channel_message_table[hdr->msgtype].message_handler) |
1094 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 1095 | else |
0a46618d | 1096 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
1097 | } |
1098 | ||
3e189519 | 1099 | /* |
e98cb276 | 1100 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 1101 | */ |
e98cb276 | 1102 | int vmbus_request_offers(void) |
3e7ee490 | 1103 | { |
82250213 | 1104 | struct vmbus_channel_message_header *msg; |
188963ec | 1105 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 1106 | int ret; |
3e7ee490 | 1107 | |
188963ec | 1108 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
1109 | sizeof(struct vmbus_channel_message_header), |
1110 | GFP_KERNEL); | |
188963ec | 1111 | if (!msginfo) |
75910f23 | 1112 | return -ENOMEM; |
3e7ee490 | 1113 | |
c50f7fb2 | 1114 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 1115 | |
c50f7fb2 | 1116 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 1117 | |
3e7ee490 | 1118 | |
c6977677 | 1119 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
1120 | sizeof(struct vmbus_channel_message_header)); |
1121 | if (ret != 0) { | |
0a46618d | 1122 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 1123 | |
0c3b7b2f S |
1124 | goto cleanup; |
1125 | } | |
3e7ee490 | 1126 | |
0c3b7b2f | 1127 | cleanup: |
dd9b15dc | 1128 | kfree(msginfo); |
3e7ee490 | 1129 | |
3e7ee490 HJ |
1130 | return ret; |
1131 | } | |
1132 | ||
e68d2971 S |
1133 | /* |
1134 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
1135 | * When a primary channel has multiple sub-channels, we try to |
1136 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
1137 | */ |
1138 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
1139 | { | |
1140 | struct list_head *cur, *tmp; | |
87712bf8 | 1141 | int cur_cpu; |
e68d2971 S |
1142 | struct vmbus_channel *cur_channel; |
1143 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
1144 | int next_channel; |
1145 | int i = 1; | |
e68d2971 S |
1146 | |
1147 | if (list_empty(&primary->sc_list)) | |
1148 | return outgoing_channel; | |
1149 | ||
a13e8bbe S |
1150 | next_channel = primary->next_oc++; |
1151 | ||
1152 | if (next_channel > (primary->num_sc)) { | |
1153 | primary->next_oc = 0; | |
1154 | return outgoing_channel; | |
1155 | } | |
1156 | ||
87712bf8 S |
1157 | cur_cpu = hv_context.vp_index[get_cpu()]; |
1158 | put_cpu(); | |
e68d2971 S |
1159 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
1160 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1161 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
1162 | continue; | |
1163 | ||
1164 | if (cur_channel->target_vp == cur_cpu) | |
1165 | return cur_channel; | |
1166 | ||
a13e8bbe S |
1167 | if (i == next_channel) |
1168 | return cur_channel; | |
e68d2971 | 1169 | |
a13e8bbe | 1170 | i++; |
e68d2971 S |
1171 | } |
1172 | ||
1173 | return outgoing_channel; | |
1174 | } | |
1175 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
1176 | ||
1177 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
1178 | { | |
1179 | struct list_head *cur, *tmp; | |
1180 | struct vmbus_channel *cur_channel; | |
1181 | ||
1182 | if (primary_channel->sc_creation_callback == NULL) | |
1183 | return; | |
1184 | ||
1185 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1186 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1187 | ||
1188 | primary_channel->sc_creation_callback(cur_channel); | |
1189 | } | |
1190 | } | |
1191 | ||
1192 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1193 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1194 | { | |
1195 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1196 | } | |
1197 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1198 | ||
1199 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1200 | { | |
1201 | bool ret; | |
1202 | ||
1203 | ret = !list_empty(&primary->sc_list); | |
1204 | ||
1205 | if (ret) { | |
1206 | /* | |
1207 | * Invoke the callback on sub-channel creation. | |
1208 | * This will present a uniform interface to the | |
1209 | * clients. | |
1210 | */ | |
1211 | invoke_sc_cb(primary); | |
1212 | } | |
1213 | ||
1214 | return ret; | |
1215 | } | |
1216 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); | |
499e8401 DC |
1217 | |
1218 | void vmbus_set_chn_rescind_callback(struct vmbus_channel *channel, | |
1219 | void (*chn_rescind_cb)(struct vmbus_channel *)) | |
1220 | { | |
1221 | channel->chn_rescind_callback = chn_rescind_cb; | |
1222 | } | |
1223 | EXPORT_SYMBOL_GPL(vmbus_set_chn_rescind_callback); |