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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
a0086dc5 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
53af545b | 28 | #include <linux/list.h> |
c88c4e4c | 29 | #include <linux/module.h> |
8b5d6d3b | 30 | #include <linux/completion.h> |
46a97191 | 31 | #include <linux/hyperv.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
7047f17d S |
35 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type); |
36 | ||
37 | static const struct vmbus_device vmbus_devs[] = { | |
38 | /* IDE */ | |
39 | { .dev_type = HV_IDE, | |
40 | HV_IDE_GUID, | |
41 | .perf_device = true, | |
42 | }, | |
43 | ||
44 | /* SCSI */ | |
45 | { .dev_type = HV_SCSI, | |
46 | HV_SCSI_GUID, | |
47 | .perf_device = true, | |
48 | }, | |
49 | ||
50 | /* Fibre Channel */ | |
51 | { .dev_type = HV_FC, | |
52 | HV_SYNTHFC_GUID, | |
53 | .perf_device = true, | |
54 | }, | |
55 | ||
56 | /* Synthetic NIC */ | |
57 | { .dev_type = HV_NIC, | |
58 | HV_NIC_GUID, | |
59 | .perf_device = true, | |
60 | }, | |
61 | ||
62 | /* Network Direct */ | |
63 | { .dev_type = HV_ND, | |
64 | HV_ND_GUID, | |
65 | .perf_device = true, | |
66 | }, | |
67 | ||
68 | /* PCIE */ | |
69 | { .dev_type = HV_PCIE, | |
70 | HV_PCIE_GUID, | |
71 | .perf_device = true, | |
72 | }, | |
73 | ||
74 | /* Synthetic Frame Buffer */ | |
75 | { .dev_type = HV_FB, | |
76 | HV_SYNTHVID_GUID, | |
77 | .perf_device = false, | |
78 | }, | |
79 | ||
80 | /* Synthetic Keyboard */ | |
81 | { .dev_type = HV_KBD, | |
82 | HV_KBD_GUID, | |
83 | .perf_device = false, | |
84 | }, | |
85 | ||
86 | /* Synthetic MOUSE */ | |
87 | { .dev_type = HV_MOUSE, | |
88 | HV_MOUSE_GUID, | |
89 | .perf_device = false, | |
90 | }, | |
91 | ||
92 | /* KVP */ | |
93 | { .dev_type = HV_KVP, | |
94 | HV_KVP_GUID, | |
95 | .perf_device = false, | |
96 | }, | |
97 | ||
98 | /* Time Synch */ | |
99 | { .dev_type = HV_TS, | |
100 | HV_TS_GUID, | |
101 | .perf_device = false, | |
102 | }, | |
103 | ||
104 | /* Heartbeat */ | |
105 | { .dev_type = HV_HB, | |
106 | HV_HEART_BEAT_GUID, | |
107 | .perf_device = false, | |
108 | }, | |
109 | ||
110 | /* Shutdown */ | |
111 | { .dev_type = HV_SHUTDOWN, | |
112 | HV_SHUTDOWN_GUID, | |
113 | .perf_device = false, | |
114 | }, | |
115 | ||
116 | /* File copy */ | |
117 | { .dev_type = HV_FCOPY, | |
118 | HV_FCOPY_GUID, | |
119 | .perf_device = false, | |
120 | }, | |
121 | ||
122 | /* Backup */ | |
123 | { .dev_type = HV_BACKUP, | |
124 | HV_VSS_GUID, | |
125 | .perf_device = false, | |
126 | }, | |
127 | ||
128 | /* Dynamic Memory */ | |
129 | { .dev_type = HV_DM, | |
130 | HV_DM_GUID, | |
131 | .perf_device = false, | |
132 | }, | |
133 | ||
134 | /* Unknown GUID */ | |
135 | { .dev_type = HV_UNKOWN, | |
136 | .perf_device = false, | |
137 | }, | |
138 | }; | |
139 | ||
140 | static u16 hv_get_dev_type(const uuid_le *guid) | |
141 | { | |
142 | u16 i; | |
143 | ||
144 | for (i = HV_IDE; i < HV_UNKOWN; i++) { | |
145 | if (!uuid_le_cmp(*guid, vmbus_devs[i].guid)) | |
146 | return i; | |
147 | } | |
148 | pr_info("Unknown GUID: %pUl\n", guid); | |
149 | return i; | |
150 | } | |
f38e7dd7 | 151 | |
c88c4e4c | 152 | /** |
da0e9631 | 153 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
154 | * @icmsghdrp: Pointer to msg header structure |
155 | * @icmsg_negotiate: Pointer to negotiate message structure | |
156 | * @buf: Raw buffer channel data | |
157 | * | |
158 | * @icmsghdrp is of type &struct icmsg_hdr. | |
159 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
160 | * Set up and fill in default negotiate response message. |
161 | * | |
6741335b S |
162 | * The fw_version specifies the framework version that |
163 | * we can support and srv_version specifies the service | |
164 | * version we can support. | |
c88c4e4c HJ |
165 | * |
166 | * Mainly used by Hyper-V drivers. | |
167 | */ | |
6741335b | 168 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 169 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 170 | int fw_version, int srv_version) |
c88c4e4c | 171 | { |
6741335b S |
172 | int icframe_major, icframe_minor; |
173 | int icmsg_major, icmsg_minor; | |
174 | int fw_major, fw_minor; | |
175 | int srv_major, srv_minor; | |
c836d0ab | 176 | int i; |
6741335b | 177 | bool found_match = false; |
c836d0ab | 178 | |
a3605300 | 179 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
180 | fw_major = (fw_version >> 16); |
181 | fw_minor = (fw_version & 0xFFFF); | |
182 | ||
183 | srv_major = (srv_version >> 16); | |
184 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 185 | |
a3605300 S |
186 | negop = (struct icmsg_negotiate *)&buf[ |
187 | sizeof(struct vmbuspipe_hdr) + | |
188 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 189 | |
6741335b S |
190 | icframe_major = negop->icframe_vercnt; |
191 | icframe_minor = 0; | |
192 | ||
193 | icmsg_major = negop->icmsg_vercnt; | |
194 | icmsg_minor = 0; | |
c836d0ab S |
195 | |
196 | /* | |
197 | * Select the framework version number we will | |
198 | * support. | |
199 | */ | |
200 | ||
201 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
202 | if ((negop->icversion_data[i].major == fw_major) && |
203 | (negop->icversion_data[i].minor == fw_minor)) { | |
204 | icframe_major = negop->icversion_data[i].major; | |
205 | icframe_minor = negop->icversion_data[i].minor; | |
206 | found_match = true; | |
207 | } | |
c836d0ab S |
208 | } |
209 | ||
6741335b S |
210 | if (!found_match) |
211 | goto fw_error; | |
212 | ||
213 | found_match = false; | |
214 | ||
c836d0ab S |
215 | for (i = negop->icframe_vercnt; |
216 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
217 | if ((negop->icversion_data[i].major == srv_major) && |
218 | (negop->icversion_data[i].minor == srv_minor)) { | |
219 | icmsg_major = negop->icversion_data[i].major; | |
220 | icmsg_minor = negop->icversion_data[i].minor; | |
221 | found_match = true; | |
222 | } | |
c88c4e4c | 223 | } |
a3605300 | 224 | |
c836d0ab | 225 | /* |
6741335b | 226 | * Respond with the framework and service |
c836d0ab S |
227 | * version numbers we can support. |
228 | */ | |
6741335b S |
229 | |
230 | fw_error: | |
231 | if (!found_match) { | |
232 | negop->icframe_vercnt = 0; | |
233 | negop->icmsg_vercnt = 0; | |
234 | } else { | |
235 | negop->icframe_vercnt = 1; | |
236 | negop->icmsg_vercnt = 1; | |
237 | } | |
238 | ||
239 | negop->icversion_data[0].major = icframe_major; | |
240 | negop->icversion_data[0].minor = icframe_minor; | |
241 | negop->icversion_data[1].major = icmsg_major; | |
242 | negop->icversion_data[1].minor = icmsg_minor; | |
243 | return found_match; | |
c88c4e4c | 244 | } |
a3605300 | 245 | |
da0e9631 | 246 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 247 | |
3e189519 | 248 | /* |
e98cb276 | 249 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 250 | */ |
50fe56d2 | 251 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 252 | { |
bc63b6f6 | 253 | static atomic_t chan_num = ATOMIC_INIT(0); |
aded7165 | 254 | struct vmbus_channel *channel; |
3e7ee490 | 255 | |
aded7165 | 256 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 257 | if (!channel) |
3e7ee490 | 258 | return NULL; |
3e7ee490 | 259 | |
bc63b6f6 | 260 | channel->id = atomic_inc_return(&chan_num); |
54411c42 | 261 | spin_lock_init(&channel->inbound_lock); |
67fae053 | 262 | spin_lock_init(&channel->lock); |
e68d2971 S |
263 | |
264 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 265 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 266 | |
3e7ee490 HJ |
267 | return channel; |
268 | } | |
269 | ||
3e189519 | 270 | /* |
e98cb276 | 271 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 272 | */ |
9f3e28e3 | 273 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 274 | { |
aadc3780 | 275 | kfree(channel); |
3e7ee490 HJ |
276 | } |
277 | ||
3a28fa35 S |
278 | static void percpu_channel_enq(void *arg) |
279 | { | |
280 | struct vmbus_channel *channel = arg; | |
281 | int cpu = smp_processor_id(); | |
282 | ||
283 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
284 | } | |
8b5d6d3b | 285 | |
3a28fa35 S |
286 | static void percpu_channel_deq(void *arg) |
287 | { | |
288 | struct vmbus_channel *channel = arg; | |
289 | ||
290 | list_del(&channel->percpu_list); | |
291 | } | |
8b5d6d3b | 292 | |
ed6cfcc5 | 293 | |
f52078cf | 294 | static void vmbus_release_relid(u32 relid) |
4b2f9abe | 295 | { |
ed6cfcc5 | 296 | struct vmbus_channel_relid_released msg; |
4b2f9abe | 297 | |
c8705979 | 298 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 299 | msg.child_relid = relid; |
c8705979 S |
300 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
301 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
f52078cf | 302 | } |
c8705979 | 303 | |
f52078cf DC |
304 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) |
305 | { | |
306 | unsigned long flags; | |
307 | struct vmbus_channel *primary_channel; | |
308 | ||
309 | vmbus_release_relid(relid); | |
ed6cfcc5 | 310 | |
34c6801e DC |
311 | BUG_ON(!channel->rescind); |
312 | ||
2115b561 S |
313 | if (channel->target_cpu != get_cpu()) { |
314 | put_cpu(); | |
3a28fa35 S |
315 | smp_call_function_single(channel->target_cpu, |
316 | percpu_channel_deq, channel, true); | |
2115b561 | 317 | } else { |
3a28fa35 | 318 | percpu_channel_deq(channel); |
2115b561 S |
319 | put_cpu(); |
320 | } | |
3a28fa35 | 321 | |
e68d2971 | 322 | if (channel->primary_channel == NULL) { |
d6f591e3 | 323 | mutex_lock(&vmbus_connection.channel_mutex); |
e68d2971 | 324 | list_del(&channel->listentry); |
d6f591e3 | 325 | mutex_unlock(&vmbus_connection.channel_mutex); |
ca1c4b74 DC |
326 | |
327 | primary_channel = channel; | |
e68d2971 S |
328 | } else { |
329 | primary_channel = channel->primary_channel; | |
67fae053 | 330 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 331 | list_del(&channel->sc_list); |
357e836a | 332 | primary_channel->num_sc--; |
67fae053 | 333 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 334 | } |
ca1c4b74 DC |
335 | |
336 | /* | |
337 | * We need to free the bit for init_vp_index() to work in the case | |
338 | * of sub-channel, when we reload drivers like hv_netvsc. | |
339 | */ | |
340 | cpumask_clear_cpu(channel->target_cpu, | |
341 | &primary_channel->alloced_cpus_in_node); | |
342 | ||
c8705979 | 343 | free_channel(channel); |
4b2f9abe | 344 | } |
8b5d6d3b | 345 | |
93e5bd06 S |
346 | void vmbus_free_channels(void) |
347 | { | |
813c5b79 DC |
348 | struct vmbus_channel *channel, *tmp; |
349 | ||
350 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
351 | listentry) { | |
34c6801e | 352 | /* hv_process_channel_removal() needs this */ |
813c5b79 | 353 | channel->rescind = true; |
93e5bd06 | 354 | |
93e5bd06 | 355 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
356 | } |
357 | } | |
358 | ||
3e189519 | 359 | /* |
e98cb276 | 360 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 361 | * associated with this offer |
bd60c33e | 362 | */ |
2dd37cb8 | 363 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 364 | { |
aded7165 | 365 | struct vmbus_channel *channel; |
188963ec | 366 | bool fnew = true; |
0f5e44ca | 367 | unsigned long flags; |
7047f17d | 368 | u16 dev_type; |
3e7ee490 | 369 | |
454f18a9 | 370 | /* Make sure this is a new offer */ |
d6f591e3 | 371 | mutex_lock(&vmbus_connection.channel_mutex); |
3e7ee490 | 372 | |
da9fcb72 | 373 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
374 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
375 | newchannel->offermsg.offer.if_type) && | |
376 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
377 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 378 | fnew = false; |
3e7ee490 HJ |
379 | break; |
380 | } | |
381 | } | |
382 | ||
8dfd3326 | 383 | if (fnew) |
c50f7fb2 | 384 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 385 | &vmbus_connection.chn_list); |
bd60c33e | 386 | |
d6f591e3 | 387 | mutex_unlock(&vmbus_connection.channel_mutex); |
3e7ee490 | 388 | |
188963ec | 389 | if (!fnew) { |
e68d2971 S |
390 | /* |
391 | * Check to see if this is a sub-channel. | |
392 | */ | |
393 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
394 | /* | |
395 | * Process the sub-channel. | |
396 | */ | |
397 | newchannel->primary_channel = channel; | |
67fae053 | 398 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 399 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 400 | channel->num_sc++; |
357e836a | 401 | spin_unlock_irqrestore(&channel->lock, flags); |
8dfd3326 VK |
402 | } else |
403 | goto err_free_chan; | |
404 | } | |
e68d2971 | 405 | |
7047f17d S |
406 | dev_type = hv_get_dev_type(&newchannel->offermsg.offer.if_type); |
407 | ||
408 | init_vp_index(newchannel, dev_type); | |
f38e7dd7 | 409 | |
8dfd3326 VK |
410 | if (newchannel->target_cpu != get_cpu()) { |
411 | put_cpu(); | |
412 | smp_call_function_single(newchannel->target_cpu, | |
413 | percpu_channel_enq, | |
414 | newchannel, true); | |
415 | } else { | |
416 | percpu_channel_enq(newchannel); | |
417 | put_cpu(); | |
3e7ee490 HJ |
418 | } |
419 | ||
42dceebe S |
420 | /* |
421 | * This state is used to indicate a successful open | |
422 | * so that when we do close the channel normally, we | |
423 | * can cleanup properly | |
424 | */ | |
425 | newchannel->state = CHANNEL_OPEN_STATE; | |
426 | ||
8dfd3326 VK |
427 | if (!fnew) { |
428 | if (channel->sc_creation_callback != NULL) | |
429 | channel->sc_creation_callback(newchannel); | |
430 | return; | |
431 | } | |
432 | ||
bd60c33e GKH |
433 | /* |
434 | * Start the process of binding this offer to the driver | |
435 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 436 | * vmbus_child_dev_add() |
bd60c33e | 437 | */ |
f2c73011 | 438 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
439 | &newchannel->offermsg.offer.if_type, |
440 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 441 | newchannel); |
9c3a6f7e | 442 | if (!newchannel->device_obj) |
5b1e5b53 | 443 | goto err_deq_chan; |
3e7ee490 | 444 | |
7047f17d | 445 | newchannel->device_obj->device_id = dev_type; |
454f18a9 BP |
446 | /* |
447 | * Add the new device to the bus. This will kick off device-driver | |
448 | * binding which eventually invokes the device driver's AddDevice() | |
449 | * method. | |
450 | */ | |
d43e2fe7 DC |
451 | if (vmbus_device_register(newchannel->device_obj) != 0) { |
452 | pr_err("unable to add child device object (relid %d)\n", | |
453 | newchannel->offermsg.child_relid); | |
454 | kfree(newchannel->device_obj); | |
455 | goto err_deq_chan; | |
456 | } | |
9c3a6f7e | 457 | return; |
2dd37cb8 | 458 | |
5b1e5b53 | 459 | err_deq_chan: |
f52078cf DC |
460 | vmbus_release_relid(newchannel->offermsg.child_relid); |
461 | ||
d6f591e3 | 462 | mutex_lock(&vmbus_connection.channel_mutex); |
5b1e5b53 | 463 | list_del(&newchannel->listentry); |
d6f591e3 | 464 | mutex_unlock(&vmbus_connection.channel_mutex); |
5b1e5b53 S |
465 | |
466 | if (newchannel->target_cpu != get_cpu()) { | |
467 | put_cpu(); | |
468 | smp_call_function_single(newchannel->target_cpu, | |
469 | percpu_channel_deq, newchannel, true); | |
470 | } else { | |
471 | percpu_channel_deq(newchannel); | |
472 | put_cpu(); | |
473 | } | |
474 | ||
9c3a6f7e VK |
475 | err_free_chan: |
476 | free_channel(newchannel); | |
3e7ee490 HJ |
477 | } |
478 | ||
a119845f S |
479 | /* |
480 | * We use this state to statically distribute the channel interrupt load. | |
481 | */ | |
1f656ff3 | 482 | static int next_numa_node_id; |
a119845f S |
483 | |
484 | /* | |
485 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 S |
486 | * channel interrupt load by binding a channel to VCPU. |
487 | * We do this in a hierarchical fashion: | |
488 | * First distribute the primary channels across available NUMA nodes | |
489 | * and then distribute the subchannels amongst the CPUs in the NUMA | |
490 | * node assigned to the primary channel. | |
491 | * | |
492 | * For pre-win8 hosts or non-performance critical channels we assign the | |
493 | * first CPU in the first NUMA node. | |
a119845f | 494 | */ |
7047f17d | 495 | static void init_vp_index(struct vmbus_channel *channel, u16 dev_type) |
a119845f S |
496 | { |
497 | u32 cur_cpu; | |
7047f17d | 498 | bool perf_chn = vmbus_devs[dev_type].perf_device; |
1f656ff3 S |
499 | struct vmbus_channel *primary = channel->primary_channel; |
500 | int next_node; | |
501 | struct cpumask available_mask; | |
9f01ec53 | 502 | struct cpumask *alloced_mask; |
a119845f | 503 | |
a119845f S |
504 | if ((vmbus_proto_version == VERSION_WS2008) || |
505 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
506 | /* | |
507 | * Prior to win8, all channel interrupts are | |
508 | * delivered on cpu 0. | |
509 | * Also if the channel is not a performance critical | |
510 | * channel, bind it to cpu 0. | |
511 | */ | |
1f656ff3 | 512 | channel->numa_node = 0; |
d3ba720d | 513 | channel->target_cpu = 0; |
9c6e64ad | 514 | channel->target_vp = hv_context.vp_index[0]; |
d3ba720d | 515 | return; |
a119845f | 516 | } |
ce59fec8 VK |
517 | |
518 | /* | |
1f656ff3 S |
519 | * We distribute primary channels evenly across all the available |
520 | * NUMA nodes and within the assigned NUMA node we will assign the | |
521 | * first available CPU to the primary channel. | |
522 | * The sub-channels will be assigned to the CPUs available in the | |
523 | * NUMA node evenly. | |
ce59fec8 | 524 | */ |
1f656ff3 S |
525 | if (!primary) { |
526 | while (true) { | |
527 | next_node = next_numa_node_id++; | |
528 | if (next_node == nr_node_ids) | |
529 | next_node = next_numa_node_id = 0; | |
530 | if (cpumask_empty(cpumask_of_node(next_node))) | |
531 | continue; | |
532 | break; | |
533 | } | |
534 | channel->numa_node = next_node; | |
535 | primary = channel; | |
536 | } | |
9f01ec53 | 537 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 538 | |
9f01ec53 | 539 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 540 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 541 | /* |
1f656ff3 S |
542 | * We have cycled through all the CPUs in the node; |
543 | * reset the alloced map. | |
ce59fec8 | 544 | */ |
9f01ec53 | 545 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
546 | } |
547 | ||
9f01ec53 | 548 | cpumask_xor(&available_mask, alloced_mask, |
1f656ff3 S |
549 | cpumask_of_node(primary->numa_node)); |
550 | ||
3b71107d DC |
551 | cur_cpu = -1; |
552 | while (true) { | |
553 | cur_cpu = cpumask_next(cur_cpu, &available_mask); | |
554 | if (cur_cpu >= nr_cpu_ids) { | |
555 | cur_cpu = -1; | |
556 | cpumask_copy(&available_mask, | |
557 | cpumask_of_node(primary->numa_node)); | |
558 | continue; | |
559 | } | |
560 | ||
ca1c4b74 DC |
561 | /* |
562 | * NOTE: in the case of sub-channel, we clear the sub-channel | |
563 | * related bit(s) in primary->alloced_cpus_in_node in | |
564 | * hv_process_channel_removal(), so when we reload drivers | |
565 | * like hv_netvsc in SMP guest, here we're able to re-allocate | |
566 | * bit from primary->alloced_cpus_in_node. | |
567 | */ | |
3b71107d DC |
568 | if (!cpumask_test_cpu(cur_cpu, |
569 | &primary->alloced_cpus_in_node)) { | |
570 | cpumask_set_cpu(cur_cpu, | |
571 | &primary->alloced_cpus_in_node); | |
572 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
573 | break; | |
574 | } | |
575 | } | |
1f656ff3 | 576 | |
d3ba720d S |
577 | channel->target_cpu = cur_cpu; |
578 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
579 | } |
580 | ||
2db84eff S |
581 | /* |
582 | * vmbus_unload_response - Handler for the unload response. | |
583 | */ | |
584 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
585 | { | |
586 | /* | |
587 | * This is a global event; just wakeup the waiting thread. | |
588 | * Once we successfully unload, we can cleanup the monitor state. | |
589 | */ | |
590 | complete(&vmbus_connection.unload_event); | |
591 | } | |
592 | ||
593 | void vmbus_initiate_unload(void) | |
594 | { | |
595 | struct vmbus_channel_message_header hdr; | |
596 | ||
4a54243f VK |
597 | /* Pre-Win2012R2 hosts don't support reconnect */ |
598 | if (vmbus_proto_version < VERSION_WIN8_1) | |
599 | return; | |
600 | ||
2db84eff S |
601 | init_completion(&vmbus_connection.unload_event); |
602 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
603 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
604 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header)); | |
605 | ||
606 | wait_for_completion(&vmbus_connection.unload_event); | |
607 | } | |
608 | ||
3e189519 | 609 | /* |
e98cb276 | 610 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 611 | * |
bd60c33e | 612 | */ |
e98cb276 | 613 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 614 | { |
bd60c33e | 615 | struct vmbus_channel_offer_channel *offer; |
188963ec | 616 | struct vmbus_channel *newchannel; |
3e7ee490 | 617 | |
bd60c33e | 618 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 619 | |
454f18a9 | 620 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 621 | newchannel = alloc_channel(); |
188963ec | 622 | if (!newchannel) { |
0a46618d | 623 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
624 | return; |
625 | } | |
626 | ||
132368bd S |
627 | /* |
628 | * By default we setup state to enable batched | |
629 | * reading. A specific service can choose to | |
630 | * disable this prior to opening the channel. | |
631 | */ | |
632 | newchannel->batched_reading = true; | |
633 | ||
b3bf60c7 S |
634 | /* |
635 | * Setup state for signalling the host. | |
636 | */ | |
637 | newchannel->sig_event = (struct hv_input_signal_event *) | |
638 | (ALIGN((unsigned long) | |
639 | &newchannel->sig_buf, | |
640 | HV_HYPERCALL_PARAM_ALIGN)); | |
641 | ||
642 | newchannel->sig_event->connectionid.asu32 = 0; | |
643 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
644 | newchannel->sig_event->flag_number = 0; | |
645 | newchannel->sig_event->rsvdz = 0; | |
646 | ||
647 | if (vmbus_proto_version != VERSION_WS2008) { | |
648 | newchannel->is_dedicated_interrupt = | |
649 | (offer->is_dedicated_interrupt != 0); | |
650 | newchannel->sig_event->connectionid.u.id = | |
651 | offer->connection_id; | |
652 | } | |
653 | ||
c50f7fb2 | 654 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 655 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
656 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
657 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 658 | |
2dd37cb8 | 659 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
660 | } |
661 | ||
3e189519 | 662 | /* |
e98cb276 | 663 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
664 | * |
665 | * We queue a work item to process this offer synchronously | |
666 | */ | |
e98cb276 | 667 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 668 | { |
bd60c33e | 669 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 670 | struct vmbus_channel *channel; |
d43e2fe7 DC |
671 | unsigned long flags; |
672 | struct device *dev; | |
3e7ee490 | 673 | |
bd60c33e | 674 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
d43e2fe7 | 675 | channel = relid2channel(rescind->child_relid); |
98e08702 | 676 | |
2dd37cb8 | 677 | if (channel == NULL) { |
f52078cf DC |
678 | /* |
679 | * This is very impossible, because in | |
680 | * vmbus_process_offer(), we have already invoked | |
681 | * vmbus_release_relid() on error. | |
682 | */ | |
3e7ee490 | 683 | return; |
2dd37cb8 | 684 | } |
3e7ee490 | 685 | |
d43e2fe7 DC |
686 | spin_lock_irqsave(&channel->lock, flags); |
687 | channel->rescind = true; | |
688 | spin_unlock_irqrestore(&channel->lock, flags); | |
689 | ||
690 | if (channel->device_obj) { | |
691 | /* | |
692 | * We will have to unregister this device from the | |
693 | * driver core. | |
694 | */ | |
695 | dev = get_device(&channel->device_obj->device); | |
696 | if (dev) { | |
697 | vmbus_device_unregister(channel->device_obj); | |
698 | put_device(dev); | |
699 | } | |
700 | } else { | |
701 | hv_process_channel_removal(channel, | |
702 | channel->offermsg.child_relid); | |
2dd37cb8 | 703 | } |
3e7ee490 HJ |
704 | } |
705 | ||
3e189519 | 706 | /* |
e98cb276 HZ |
707 | * vmbus_onoffers_delivered - |
708 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
709 | * |
710 | * Nothing to do here. | |
711 | */ | |
e98cb276 | 712 | static void vmbus_onoffers_delivered( |
bd60c33e | 713 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 714 | { |
3e7ee490 HJ |
715 | } |
716 | ||
3e189519 | 717 | /* |
e98cb276 | 718 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
719 | * |
720 | * This is invoked when we received a response to our channel open request. | |
721 | * Find the matching request, copy the response and signal the requesting | |
722 | * thread. | |
723 | */ | |
e98cb276 | 724 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 725 | { |
bd60c33e | 726 | struct vmbus_channel_open_result *result; |
188963ec HZ |
727 | struct vmbus_channel_msginfo *msginfo; |
728 | struct vmbus_channel_message_header *requestheader; | |
729 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 730 | unsigned long flags; |
3e7ee490 | 731 | |
bd60c33e | 732 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 733 | |
bd60c33e GKH |
734 | /* |
735 | * Find the open msg, copy the result and signal/unblock the wait event | |
736 | */ | |
15b2f647 | 737 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 738 | |
ebb61e5f HJ |
739 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
740 | msglistentry) { | |
188963ec | 741 | requestheader = |
c50f7fb2 | 742 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 743 | |
c50f7fb2 | 744 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 745 | openmsg = |
c50f7fb2 HZ |
746 | (struct vmbus_channel_open_channel *)msginfo->msg; |
747 | if (openmsg->child_relid == result->child_relid && | |
748 | openmsg->openid == result->openid) { | |
749 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 750 | result, |
9568a193 S |
751 | sizeof( |
752 | struct vmbus_channel_open_result)); | |
753 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
754 | break; |
755 | } | |
756 | } | |
757 | } | |
15b2f647 | 758 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
759 | } |
760 | ||
3e189519 | 761 | /* |
e98cb276 | 762 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
763 | * |
764 | * This is invoked when we received a response to our gpadl create request. | |
765 | * Find the matching request, copy the response and signal the requesting | |
766 | * thread. | |
767 | */ | |
e98cb276 | 768 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 769 | { |
188963ec | 770 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
771 | struct vmbus_channel_msginfo *msginfo; |
772 | struct vmbus_channel_message_header *requestheader; | |
773 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 774 | unsigned long flags; |
3e7ee490 | 775 | |
188963ec | 776 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 777 | |
bd60c33e GKH |
778 | /* |
779 | * Find the establish msg, copy the result and signal/unblock the wait | |
780 | * event | |
781 | */ | |
15b2f647 | 782 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 783 | |
ebb61e5f HJ |
784 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
785 | msglistentry) { | |
188963ec | 786 | requestheader = |
c50f7fb2 | 787 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 788 | |
c50f7fb2 | 789 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
790 | gpadlheader = |
791 | (struct vmbus_channel_gpadl_header *)requestheader; | |
792 | ||
c50f7fb2 HZ |
793 | if ((gpadlcreated->child_relid == |
794 | gpadlheader->child_relid) && | |
795 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
796 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 797 | gpadlcreated, |
9568a193 S |
798 | sizeof( |
799 | struct vmbus_channel_gpadl_created)); | |
800 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
801 | break; |
802 | } | |
803 | } | |
804 | } | |
15b2f647 | 805 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
806 | } |
807 | ||
3e189519 | 808 | /* |
e98cb276 | 809 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
810 | * |
811 | * This is invoked when we received a response to our gpadl teardown request. | |
812 | * Find the matching request, copy the response and signal the requesting | |
813 | * thread. | |
814 | */ | |
e98cb276 | 815 | static void vmbus_ongpadl_torndown( |
bd60c33e | 816 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 817 | { |
188963ec | 818 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
819 | struct vmbus_channel_msginfo *msginfo; |
820 | struct vmbus_channel_message_header *requestheader; | |
821 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 822 | unsigned long flags; |
3e7ee490 | 823 | |
188963ec | 824 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
825 | |
826 | /* | |
827 | * Find the open msg, copy the result and signal/unblock the wait event | |
828 | */ | |
15b2f647 | 829 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 830 | |
ebb61e5f HJ |
831 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
832 | msglistentry) { | |
188963ec | 833 | requestheader = |
c50f7fb2 | 834 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 835 | |
c50f7fb2 | 836 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
837 | gpadl_teardown = |
838 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 839 | |
c50f7fb2 HZ |
840 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
841 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 842 | gpadl_torndown, |
9568a193 S |
843 | sizeof( |
844 | struct vmbus_channel_gpadl_torndown)); | |
845 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
846 | break; |
847 | } | |
848 | } | |
849 | } | |
15b2f647 | 850 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
851 | } |
852 | ||
3e189519 | 853 | /* |
e98cb276 | 854 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
855 | * |
856 | * This is invoked when we received a response to our initiate contact request. | |
857 | * Find the matching request, copy the response and signal the requesting | |
858 | * thread. | |
859 | */ | |
e98cb276 | 860 | static void vmbus_onversion_response( |
bd60c33e | 861 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 862 | { |
188963ec HZ |
863 | struct vmbus_channel_msginfo *msginfo; |
864 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 865 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 866 | unsigned long flags; |
3e7ee490 | 867 | |
188963ec | 868 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 869 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 870 | |
ebb61e5f HJ |
871 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
872 | msglistentry) { | |
188963ec | 873 | requestheader = |
c50f7fb2 | 874 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 875 | |
c50f7fb2 HZ |
876 | if (requestheader->msgtype == |
877 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 878 | memcpy(&msginfo->response.version_response, |
188963ec | 879 | version_response, |
bd60c33e | 880 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 881 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
882 | } |
883 | } | |
15b2f647 | 884 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
885 | } |
886 | ||
c8212f04 | 887 | /* Channel message dispatch table */ |
652594c7 | 888 | struct vmbus_channel_message_table_entry |
b7c6b02f | 889 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
890 | {CHANNELMSG_INVALID, 0, NULL}, |
891 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
892 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
893 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
894 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
895 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
896 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
897 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
898 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
899 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
900 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
901 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
902 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
903 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
904 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
905 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
906 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
2db84eff | 907 | {CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response}, |
c8212f04 GKH |
908 | }; |
909 | ||
3e189519 | 910 | /* |
e98cb276 | 911 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
912 | * |
913 | * This is invoked in the vmbus worker thread context. | |
914 | */ | |
e98cb276 | 915 | void vmbus_onmessage(void *context) |
3e7ee490 | 916 | { |
188963ec | 917 | struct hv_message *msg = context; |
82250213 | 918 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
919 | int size; |
920 | ||
f6feebe0 HZ |
921 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
922 | size = msg->header.payload_size; | |
3e7ee490 | 923 | |
c50f7fb2 | 924 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 925 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 926 | hdr->msgtype, size); |
04f50c4d | 927 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 928 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
929 | return; |
930 | } | |
931 | ||
b7c6b02f S |
932 | if (channel_message_table[hdr->msgtype].message_handler) |
933 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 934 | else |
0a46618d | 935 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
936 | } |
937 | ||
3e189519 | 938 | /* |
e98cb276 | 939 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 940 | */ |
e98cb276 | 941 | int vmbus_request_offers(void) |
3e7ee490 | 942 | { |
82250213 | 943 | struct vmbus_channel_message_header *msg; |
188963ec | 944 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 945 | int ret; |
3e7ee490 | 946 | |
188963ec | 947 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
948 | sizeof(struct vmbus_channel_message_header), |
949 | GFP_KERNEL); | |
188963ec | 950 | if (!msginfo) |
75910f23 | 951 | return -ENOMEM; |
3e7ee490 | 952 | |
c50f7fb2 | 953 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 954 | |
c50f7fb2 | 955 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 956 | |
3e7ee490 | 957 | |
c6977677 | 958 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
959 | sizeof(struct vmbus_channel_message_header)); |
960 | if (ret != 0) { | |
0a46618d | 961 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 962 | |
0c3b7b2f S |
963 | goto cleanup; |
964 | } | |
3e7ee490 | 965 | |
0c3b7b2f | 966 | cleanup: |
dd9b15dc | 967 | kfree(msginfo); |
3e7ee490 | 968 | |
3e7ee490 HJ |
969 | return ret; |
970 | } | |
971 | ||
e68d2971 S |
972 | /* |
973 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
974 | * When a primary channel has multiple sub-channels, we try to |
975 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
976 | */ |
977 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
978 | { | |
979 | struct list_head *cur, *tmp; | |
87712bf8 | 980 | int cur_cpu; |
e68d2971 S |
981 | struct vmbus_channel *cur_channel; |
982 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
983 | int next_channel; |
984 | int i = 1; | |
e68d2971 S |
985 | |
986 | if (list_empty(&primary->sc_list)) | |
987 | return outgoing_channel; | |
988 | ||
a13e8bbe S |
989 | next_channel = primary->next_oc++; |
990 | ||
991 | if (next_channel > (primary->num_sc)) { | |
992 | primary->next_oc = 0; | |
993 | return outgoing_channel; | |
994 | } | |
995 | ||
87712bf8 S |
996 | cur_cpu = hv_context.vp_index[get_cpu()]; |
997 | put_cpu(); | |
e68d2971 S |
998 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
999 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1000 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
1001 | continue; | |
1002 | ||
1003 | if (cur_channel->target_vp == cur_cpu) | |
1004 | return cur_channel; | |
1005 | ||
a13e8bbe S |
1006 | if (i == next_channel) |
1007 | return cur_channel; | |
e68d2971 | 1008 | |
a13e8bbe | 1009 | i++; |
e68d2971 S |
1010 | } |
1011 | ||
1012 | return outgoing_channel; | |
1013 | } | |
1014 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
1015 | ||
1016 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
1017 | { | |
1018 | struct list_head *cur, *tmp; | |
1019 | struct vmbus_channel *cur_channel; | |
1020 | ||
1021 | if (primary_channel->sc_creation_callback == NULL) | |
1022 | return; | |
1023 | ||
1024 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
1025 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
1026 | ||
1027 | primary_channel->sc_creation_callback(cur_channel); | |
1028 | } | |
1029 | } | |
1030 | ||
1031 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
1032 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
1033 | { | |
1034 | primary_channel->sc_creation_callback = sc_cr_cb; | |
1035 | } | |
1036 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
1037 | ||
1038 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
1039 | { | |
1040 | bool ret; | |
1041 | ||
1042 | ret = !list_empty(&primary->sc_list); | |
1043 | ||
1044 | if (ret) { | |
1045 | /* | |
1046 | * Invoke the callback on sub-channel creation. | |
1047 | * This will present a uniform interface to the | |
1048 | * clients. | |
1049 | */ | |
1050 | invoke_sc_cb(primary); | |
1051 | } | |
1052 | ||
1053 | return ret; | |
1054 | } | |
1055 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |