Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
a0086dc5 | 23 | #include <linux/kernel.h> |
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 | |
1d7e907f | 35 | struct vmbus_channel_message_table_entry { |
cf9dcba7 | 36 | enum vmbus_channel_message_type message_type; |
fa90f1de | 37 | void (*message_handler)(struct vmbus_channel_message_header *msg); |
1d7e907f | 38 | }; |
3e7ee490 | 39 | |
c88c4e4c HJ |
40 | |
41 | /** | |
da0e9631 | 42 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
43 | * @icmsghdrp: Pointer to msg header structure |
44 | * @icmsg_negotiate: Pointer to negotiate message structure | |
45 | * @buf: Raw buffer channel data | |
46 | * | |
47 | * @icmsghdrp is of type &struct icmsg_hdr. | |
48 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
49 | * Set up and fill in default negotiate response message. |
50 | * | |
6741335b S |
51 | * The fw_version specifies the framework version that |
52 | * we can support and srv_version specifies the service | |
53 | * version we can support. | |
c88c4e4c HJ |
54 | * |
55 | * Mainly used by Hyper-V drivers. | |
56 | */ | |
6741335b | 57 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 58 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 59 | int fw_version, int srv_version) |
c88c4e4c | 60 | { |
6741335b S |
61 | int icframe_major, icframe_minor; |
62 | int icmsg_major, icmsg_minor; | |
63 | int fw_major, fw_minor; | |
64 | int srv_major, srv_minor; | |
c836d0ab | 65 | int i; |
6741335b | 66 | bool found_match = false; |
c836d0ab | 67 | |
a3605300 | 68 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
69 | fw_major = (fw_version >> 16); |
70 | fw_minor = (fw_version & 0xFFFF); | |
71 | ||
72 | srv_major = (srv_version >> 16); | |
73 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 74 | |
a3605300 S |
75 | negop = (struct icmsg_negotiate *)&buf[ |
76 | sizeof(struct vmbuspipe_hdr) + | |
77 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 78 | |
6741335b S |
79 | icframe_major = negop->icframe_vercnt; |
80 | icframe_minor = 0; | |
81 | ||
82 | icmsg_major = negop->icmsg_vercnt; | |
83 | icmsg_minor = 0; | |
c836d0ab S |
84 | |
85 | /* | |
86 | * Select the framework version number we will | |
87 | * support. | |
88 | */ | |
89 | ||
90 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
91 | if ((negop->icversion_data[i].major == fw_major) && |
92 | (negop->icversion_data[i].minor == fw_minor)) { | |
93 | icframe_major = negop->icversion_data[i].major; | |
94 | icframe_minor = negop->icversion_data[i].minor; | |
95 | found_match = true; | |
96 | } | |
c836d0ab S |
97 | } |
98 | ||
6741335b S |
99 | if (!found_match) |
100 | goto fw_error; | |
101 | ||
102 | found_match = false; | |
103 | ||
c836d0ab S |
104 | for (i = negop->icframe_vercnt; |
105 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
106 | if ((negop->icversion_data[i].major == srv_major) && |
107 | (negop->icversion_data[i].minor == srv_minor)) { | |
108 | icmsg_major = negop->icversion_data[i].major; | |
109 | icmsg_minor = negop->icversion_data[i].minor; | |
110 | found_match = true; | |
111 | } | |
c88c4e4c | 112 | } |
a3605300 | 113 | |
c836d0ab | 114 | /* |
6741335b | 115 | * Respond with the framework and service |
c836d0ab S |
116 | * version numbers we can support. |
117 | */ | |
6741335b S |
118 | |
119 | fw_error: | |
120 | if (!found_match) { | |
121 | negop->icframe_vercnt = 0; | |
122 | negop->icmsg_vercnt = 0; | |
123 | } else { | |
124 | negop->icframe_vercnt = 1; | |
125 | negop->icmsg_vercnt = 1; | |
126 | } | |
127 | ||
128 | negop->icversion_data[0].major = icframe_major; | |
129 | negop->icversion_data[0].minor = icframe_minor; | |
130 | negop->icversion_data[1].major = icmsg_major; | |
131 | negop->icversion_data[1].minor = icmsg_minor; | |
132 | return found_match; | |
c88c4e4c | 133 | } |
a3605300 | 134 | |
da0e9631 | 135 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 136 | |
3e189519 | 137 | /* |
e98cb276 | 138 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 139 | */ |
50fe56d2 | 140 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 141 | { |
aded7165 | 142 | struct vmbus_channel *channel; |
3e7ee490 | 143 | |
aded7165 | 144 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 145 | if (!channel) |
3e7ee490 | 146 | return NULL; |
3e7ee490 | 147 | |
54411c42 | 148 | spin_lock_init(&channel->inbound_lock); |
e68d2971 S |
149 | spin_lock_init(&channel->sc_lock); |
150 | ||
151 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 152 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 153 | |
c50f7fb2 HZ |
154 | channel->controlwq = create_workqueue("hv_vmbus_ctl"); |
155 | if (!channel->controlwq) { | |
8c69f52a | 156 | kfree(channel); |
3e7ee490 HJ |
157 | return NULL; |
158 | } | |
159 | ||
160 | return channel; | |
161 | } | |
162 | ||
3e189519 | 163 | /* |
e98cb276 | 164 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 165 | */ |
4b2f9abe | 166 | static void release_channel(struct work_struct *work) |
3e7ee490 | 167 | { |
4b2f9abe TT |
168 | struct vmbus_channel *channel = container_of(work, |
169 | struct vmbus_channel, | |
170 | work); | |
3e7ee490 | 171 | |
c50f7fb2 | 172 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 173 | |
8c69f52a | 174 | kfree(channel); |
3e7ee490 HJ |
175 | } |
176 | ||
3e189519 | 177 | /* |
e98cb276 | 178 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 179 | */ |
9f3e28e3 | 180 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 181 | { |
3e7ee490 | 182 | |
bd60c33e GKH |
183 | /* |
184 | * We have to release the channel's workqueue/thread in the vmbus's | |
185 | * workqueue/thread context | |
186 | * ie we can't destroy ourselves. | |
187 | */ | |
4b2f9abe | 188 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 189 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
190 | } |
191 | ||
3a28fa35 S |
192 | static void percpu_channel_enq(void *arg) |
193 | { | |
194 | struct vmbus_channel *channel = arg; | |
195 | int cpu = smp_processor_id(); | |
196 | ||
197 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
198 | } | |
8b5d6d3b | 199 | |
3a28fa35 S |
200 | static void percpu_channel_deq(void *arg) |
201 | { | |
202 | struct vmbus_channel *channel = arg; | |
203 | ||
204 | list_del(&channel->percpu_list); | |
205 | } | |
8b5d6d3b | 206 | |
4b2f9abe TT |
207 | /* |
208 | * vmbus_process_rescind_offer - | |
209 | * Rescind the offer by initiating a device removal | |
210 | */ | |
211 | static void vmbus_process_rescind_offer(struct work_struct *work) | |
212 | { | |
213 | struct vmbus_channel *channel = container_of(work, | |
214 | struct vmbus_channel, | |
215 | work); | |
c8705979 | 216 | unsigned long flags; |
e68d2971 | 217 | struct vmbus_channel *primary_channel; |
c8705979 | 218 | struct vmbus_channel_relid_released msg; |
04a258c1 VK |
219 | struct device *dev; |
220 | ||
221 | if (channel->device_obj) { | |
222 | dev = get_device(&channel->device_obj->device); | |
223 | if (dev) { | |
224 | vmbus_device_unregister(channel->device_obj); | |
225 | put_device(dev); | |
226 | } | |
227 | } | |
4b2f9abe | 228 | |
c8705979 S |
229 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
230 | msg.child_relid = channel->offermsg.child_relid; | |
231 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; | |
232 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
233 | ||
2115b561 S |
234 | if (channel->target_cpu != get_cpu()) { |
235 | put_cpu(); | |
3a28fa35 S |
236 | smp_call_function_single(channel->target_cpu, |
237 | percpu_channel_deq, channel, true); | |
2115b561 | 238 | } else { |
3a28fa35 | 239 | percpu_channel_deq(channel); |
2115b561 S |
240 | put_cpu(); |
241 | } | |
3a28fa35 | 242 | |
e68d2971 S |
243 | if (channel->primary_channel == NULL) { |
244 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
245 | list_del(&channel->listentry); | |
246 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
247 | } else { | |
248 | primary_channel = channel->primary_channel; | |
249 | spin_lock_irqsave(&primary_channel->sc_lock, flags); | |
565ce642 | 250 | list_del(&channel->sc_list); |
e68d2971 S |
251 | spin_unlock_irqrestore(&primary_channel->sc_lock, flags); |
252 | } | |
c8705979 | 253 | free_channel(channel); |
4b2f9abe | 254 | } |
8b5d6d3b | 255 | |
93e5bd06 S |
256 | void vmbus_free_channels(void) |
257 | { | |
258 | struct vmbus_channel *channel; | |
259 | ||
260 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
261 | vmbus_device_unregister(channel->device_obj); | |
262 | kfree(channel->device_obj); | |
263 | free_channel(channel); | |
264 | } | |
265 | } | |
266 | ||
3e189519 | 267 | /* |
e98cb276 | 268 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 269 | * associated with this offer |
bd60c33e | 270 | */ |
4b2f9abe | 271 | static void vmbus_process_offer(struct work_struct *work) |
3e7ee490 | 272 | { |
4b2f9abe TT |
273 | struct vmbus_channel *newchannel = container_of(work, |
274 | struct vmbus_channel, | |
275 | work); | |
aded7165 | 276 | struct vmbus_channel *channel; |
188963ec | 277 | bool fnew = true; |
3a28fa35 | 278 | bool enq = false; |
bd60c33e | 279 | int ret; |
0f5e44ca | 280 | unsigned long flags; |
3e7ee490 | 281 | |
4b2f9abe TT |
282 | /* The next possible work is rescind handling */ |
283 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); | |
284 | ||
454f18a9 | 285 | /* Make sure this is a new offer */ |
15b2f647 | 286 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 287 | |
da9fcb72 | 288 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
289 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
290 | newchannel->offermsg.offer.if_type) && | |
291 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
292 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 293 | fnew = false; |
3e7ee490 HJ |
294 | break; |
295 | } | |
296 | } | |
297 | ||
3a28fa35 | 298 | if (fnew) { |
c50f7fb2 | 299 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 300 | &vmbus_connection.chn_list); |
3a28fa35 S |
301 | enq = true; |
302 | } | |
bd60c33e | 303 | |
15b2f647 | 304 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 305 | |
3a28fa35 | 306 | if (enq) { |
2115b561 S |
307 | if (newchannel->target_cpu != get_cpu()) { |
308 | put_cpu(); | |
3a28fa35 S |
309 | smp_call_function_single(newchannel->target_cpu, |
310 | percpu_channel_enq, | |
311 | newchannel, true); | |
2115b561 | 312 | } else { |
3a28fa35 | 313 | percpu_channel_enq(newchannel); |
2115b561 S |
314 | put_cpu(); |
315 | } | |
3a28fa35 | 316 | } |
188963ec | 317 | if (!fnew) { |
e68d2971 S |
318 | /* |
319 | * Check to see if this is a sub-channel. | |
320 | */ | |
321 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
322 | /* | |
323 | * Process the sub-channel. | |
324 | */ | |
325 | newchannel->primary_channel = channel; | |
326 | spin_lock_irqsave(&channel->sc_lock, flags); | |
327 | list_add_tail(&newchannel->sc_list, &channel->sc_list); | |
328 | spin_unlock_irqrestore(&channel->sc_lock, flags); | |
3a28fa35 | 329 | |
2115b561 S |
330 | if (newchannel->target_cpu != get_cpu()) { |
331 | put_cpu(); | |
3a28fa35 S |
332 | smp_call_function_single(newchannel->target_cpu, |
333 | percpu_channel_enq, | |
334 | newchannel, true); | |
2115b561 | 335 | } else { |
3a28fa35 | 336 | percpu_channel_enq(newchannel); |
2115b561 S |
337 | put_cpu(); |
338 | } | |
3a28fa35 | 339 | |
e68d2971 S |
340 | newchannel->state = CHANNEL_OPEN_STATE; |
341 | if (channel->sc_creation_callback != NULL) | |
342 | channel->sc_creation_callback(newchannel); | |
343 | ||
344 | return; | |
345 | } | |
346 | ||
e98cb276 | 347 | free_channel(newchannel); |
3e7ee490 HJ |
348 | return; |
349 | } | |
350 | ||
42dceebe S |
351 | /* |
352 | * This state is used to indicate a successful open | |
353 | * so that when we do close the channel normally, we | |
354 | * can cleanup properly | |
355 | */ | |
356 | newchannel->state = CHANNEL_OPEN_STATE; | |
357 | ||
bd60c33e GKH |
358 | /* |
359 | * Start the process of binding this offer to the driver | |
360 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 361 | * vmbus_child_dev_add() |
bd60c33e | 362 | */ |
f2c73011 | 363 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
364 | &newchannel->offermsg.offer.if_type, |
365 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 366 | newchannel); |
3e7ee490 | 367 | |
454f18a9 BP |
368 | /* |
369 | * Add the new device to the bus. This will kick off device-driver | |
370 | * binding which eventually invokes the device driver's AddDevice() | |
371 | * method. | |
372 | */ | |
22794281 | 373 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 374 | if (ret != 0) { |
0a46618d | 375 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 376 | newchannel->offermsg.child_relid); |
3e7ee490 | 377 | |
15b2f647 | 378 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 379 | list_del(&newchannel->listentry); |
15b2f647 | 380 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
8b8ee675 | 381 | kfree(newchannel->device_obj); |
3e7ee490 | 382 | |
e98cb276 | 383 | free_channel(newchannel); |
3e7ee490 | 384 | } |
3e7ee490 HJ |
385 | } |
386 | ||
a119845f S |
387 | enum { |
388 | IDE = 0, | |
389 | SCSI, | |
390 | NIC, | |
391 | MAX_PERF_CHN, | |
392 | }; | |
393 | ||
394 | /* | |
7fb96565 | 395 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
396 | * We attempt to distribute the interrupt load for these devices across |
397 | * all available CPUs. | |
398 | */ | |
7fb96565 | 399 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 400 | /* IDE */ |
7fb96565 | 401 | { HV_IDE_GUID, }, |
a119845f | 402 | /* Storage - SCSI */ |
7fb96565 | 403 | { HV_SCSI_GUID, }, |
a119845f | 404 | /* Network */ |
7fb96565 | 405 | { HV_NIC_GUID, }, |
a119845f S |
406 | }; |
407 | ||
408 | ||
409 | /* | |
410 | * We use this state to statically distribute the channel interrupt load. | |
411 | */ | |
412 | static u32 next_vp; | |
413 | ||
414 | /* | |
415 | * Starting with Win8, we can statically distribute the incoming | |
416 | * channel interrupt load by binding a channel to VCPU. We | |
417 | * implement here a simple round robin scheme for distributing | |
418 | * the interrupt load. | |
419 | * We will bind channels that are not performance critical to cpu 0 and | |
420 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
421 | * distributed across all available CPUs. | |
422 | */ | |
f9da455b | 423 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
424 | { |
425 | u32 cur_cpu; | |
426 | int i; | |
427 | bool perf_chn = false; | |
428 | u32 max_cpus = num_online_cpus(); | |
429 | ||
430 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 431 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
432 | sizeof(uuid_le))) { |
433 | perf_chn = true; | |
434 | break; | |
435 | } | |
436 | } | |
437 | if ((vmbus_proto_version == VERSION_WS2008) || | |
438 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
439 | /* | |
440 | * Prior to win8, all channel interrupts are | |
441 | * delivered on cpu 0. | |
442 | * Also if the channel is not a performance critical | |
443 | * channel, bind it to cpu 0. | |
444 | */ | |
d3ba720d S |
445 | channel->target_cpu = 0; |
446 | channel->target_vp = 0; | |
447 | return; | |
a119845f S |
448 | } |
449 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
450 | channel->target_cpu = cur_cpu; |
451 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
452 | } |
453 | ||
3e189519 | 454 | /* |
e98cb276 | 455 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 456 | * |
bd60c33e | 457 | */ |
e98cb276 | 458 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 459 | { |
bd60c33e | 460 | struct vmbus_channel_offer_channel *offer; |
188963ec | 461 | struct vmbus_channel *newchannel; |
3e7ee490 | 462 | |
bd60c33e | 463 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 464 | |
454f18a9 | 465 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 466 | newchannel = alloc_channel(); |
188963ec | 467 | if (!newchannel) { |
0a46618d | 468 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
469 | return; |
470 | } | |
471 | ||
132368bd S |
472 | /* |
473 | * By default we setup state to enable batched | |
474 | * reading. A specific service can choose to | |
475 | * disable this prior to opening the channel. | |
476 | */ | |
477 | newchannel->batched_reading = true; | |
478 | ||
b3bf60c7 S |
479 | /* |
480 | * Setup state for signalling the host. | |
481 | */ | |
482 | newchannel->sig_event = (struct hv_input_signal_event *) | |
483 | (ALIGN((unsigned long) | |
484 | &newchannel->sig_buf, | |
485 | HV_HYPERCALL_PARAM_ALIGN)); | |
486 | ||
487 | newchannel->sig_event->connectionid.asu32 = 0; | |
488 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
489 | newchannel->sig_event->flag_number = 0; | |
490 | newchannel->sig_event->rsvdz = 0; | |
491 | ||
492 | if (vmbus_proto_version != VERSION_WS2008) { | |
493 | newchannel->is_dedicated_interrupt = | |
494 | (offer->is_dedicated_interrupt != 0); | |
495 | newchannel->sig_event->connectionid.u.id = | |
496 | offer->connection_id; | |
497 | } | |
498 | ||
d3ba720d | 499 | init_vp_index(newchannel, &offer->offer.if_type); |
abbf3b2a | 500 | |
c50f7fb2 | 501 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 502 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
503 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
504 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 505 | |
4b2f9abe TT |
506 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
507 | queue_work(newchannel->controlwq, &newchannel->work); | |
3e7ee490 HJ |
508 | } |
509 | ||
3e189519 | 510 | /* |
e98cb276 | 511 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
512 | * |
513 | * We queue a work item to process this offer synchronously | |
514 | */ | |
e98cb276 | 515 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 516 | { |
bd60c33e | 517 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 518 | struct vmbus_channel *channel; |
3e7ee490 | 519 | |
bd60c33e | 520 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 521 | channel = relid2channel(rescind->child_relid); |
98e08702 HJ |
522 | |
523 | if (channel == NULL) | |
524 | /* Just return here, no channel found */ | |
3e7ee490 | 525 | return; |
3e7ee490 | 526 | |
c3582a2c HZ |
527 | channel->rescind = true; |
528 | ||
4b2f9abe TT |
529 | /* work is initialized for vmbus_process_rescind_offer() from |
530 | * vmbus_process_offer() where the channel got created */ | |
531 | queue_work(channel->controlwq, &channel->work); | |
3e7ee490 HJ |
532 | } |
533 | ||
3e189519 | 534 | /* |
e98cb276 HZ |
535 | * vmbus_onoffers_delivered - |
536 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
537 | * |
538 | * Nothing to do here. | |
539 | */ | |
e98cb276 | 540 | static void vmbus_onoffers_delivered( |
bd60c33e | 541 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 542 | { |
3e7ee490 HJ |
543 | } |
544 | ||
3e189519 | 545 | /* |
e98cb276 | 546 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
547 | * |
548 | * This is invoked when we received a response to our channel open request. | |
549 | * Find the matching request, copy the response and signal the requesting | |
550 | * thread. | |
551 | */ | |
e98cb276 | 552 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 553 | { |
bd60c33e | 554 | struct vmbus_channel_open_result *result; |
188963ec HZ |
555 | struct vmbus_channel_msginfo *msginfo; |
556 | struct vmbus_channel_message_header *requestheader; | |
557 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 558 | unsigned long flags; |
3e7ee490 | 559 | |
bd60c33e | 560 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 561 | |
bd60c33e GKH |
562 | /* |
563 | * Find the open msg, copy the result and signal/unblock the wait event | |
564 | */ | |
15b2f647 | 565 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 566 | |
ebb61e5f HJ |
567 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
568 | msglistentry) { | |
188963ec | 569 | requestheader = |
c50f7fb2 | 570 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 571 | |
c50f7fb2 | 572 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 573 | openmsg = |
c50f7fb2 HZ |
574 | (struct vmbus_channel_open_channel *)msginfo->msg; |
575 | if (openmsg->child_relid == result->child_relid && | |
576 | openmsg->openid == result->openid) { | |
577 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 578 | result, |
9568a193 S |
579 | sizeof( |
580 | struct vmbus_channel_open_result)); | |
581 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
582 | break; |
583 | } | |
584 | } | |
585 | } | |
15b2f647 | 586 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
587 | } |
588 | ||
3e189519 | 589 | /* |
e98cb276 | 590 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
591 | * |
592 | * This is invoked when we received a response to our gpadl create request. | |
593 | * Find the matching request, copy the response and signal the requesting | |
594 | * thread. | |
595 | */ | |
e98cb276 | 596 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 597 | { |
188963ec | 598 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
599 | struct vmbus_channel_msginfo *msginfo; |
600 | struct vmbus_channel_message_header *requestheader; | |
601 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 602 | unsigned long flags; |
3e7ee490 | 603 | |
188963ec | 604 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 605 | |
bd60c33e GKH |
606 | /* |
607 | * Find the establish msg, copy the result and signal/unblock the wait | |
608 | * event | |
609 | */ | |
15b2f647 | 610 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 611 | |
ebb61e5f HJ |
612 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
613 | msglistentry) { | |
188963ec | 614 | requestheader = |
c50f7fb2 | 615 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 616 | |
c50f7fb2 | 617 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
618 | gpadlheader = |
619 | (struct vmbus_channel_gpadl_header *)requestheader; | |
620 | ||
c50f7fb2 HZ |
621 | if ((gpadlcreated->child_relid == |
622 | gpadlheader->child_relid) && | |
623 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
624 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 625 | gpadlcreated, |
9568a193 S |
626 | sizeof( |
627 | struct vmbus_channel_gpadl_created)); | |
628 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
629 | break; |
630 | } | |
631 | } | |
632 | } | |
15b2f647 | 633 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
634 | } |
635 | ||
3e189519 | 636 | /* |
e98cb276 | 637 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
638 | * |
639 | * This is invoked when we received a response to our gpadl teardown request. | |
640 | * Find the matching request, copy the response and signal the requesting | |
641 | * thread. | |
642 | */ | |
e98cb276 | 643 | static void vmbus_ongpadl_torndown( |
bd60c33e | 644 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 645 | { |
188963ec | 646 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
647 | struct vmbus_channel_msginfo *msginfo; |
648 | struct vmbus_channel_message_header *requestheader; | |
649 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 650 | unsigned long flags; |
3e7ee490 | 651 | |
188963ec | 652 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
653 | |
654 | /* | |
655 | * Find the open msg, copy the result and signal/unblock the wait event | |
656 | */ | |
15b2f647 | 657 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 658 | |
ebb61e5f HJ |
659 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
660 | msglistentry) { | |
188963ec | 661 | requestheader = |
c50f7fb2 | 662 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 663 | |
c50f7fb2 | 664 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
665 | gpadl_teardown = |
666 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 667 | |
c50f7fb2 HZ |
668 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
669 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 670 | gpadl_torndown, |
9568a193 S |
671 | sizeof( |
672 | struct vmbus_channel_gpadl_torndown)); | |
673 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
674 | break; |
675 | } | |
676 | } | |
677 | } | |
15b2f647 | 678 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
679 | } |
680 | ||
3e189519 | 681 | /* |
e98cb276 | 682 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
683 | * |
684 | * This is invoked when we received a response to our initiate contact request. | |
685 | * Find the matching request, copy the response and signal the requesting | |
686 | * thread. | |
687 | */ | |
e98cb276 | 688 | static void vmbus_onversion_response( |
bd60c33e | 689 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 690 | { |
188963ec HZ |
691 | struct vmbus_channel_msginfo *msginfo; |
692 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 693 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 694 | unsigned long flags; |
3e7ee490 | 695 | |
188963ec | 696 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 697 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 698 | |
ebb61e5f HJ |
699 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
700 | msglistentry) { | |
188963ec | 701 | requestheader = |
c50f7fb2 | 702 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 703 | |
c50f7fb2 HZ |
704 | if (requestheader->msgtype == |
705 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 706 | memcpy(&msginfo->response.version_response, |
188963ec | 707 | version_response, |
bd60c33e | 708 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 709 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
710 | } |
711 | } | |
15b2f647 | 712 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
713 | } |
714 | ||
c8212f04 GKH |
715 | /* Channel message dispatch table */ |
716 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 717 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
718 | {CHANNELMSG_INVALID, NULL}, |
719 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
720 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
721 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
722 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
723 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
724 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
725 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
726 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
727 | {CHANNELMSG_GPADL_BODY, NULL}, | |
728 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
729 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
730 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
731 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
732 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
733 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
734 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
735 | }; |
736 | ||
3e189519 | 737 | /* |
e98cb276 | 738 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
739 | * |
740 | * This is invoked in the vmbus worker thread context. | |
741 | */ | |
e98cb276 | 742 | void vmbus_onmessage(void *context) |
3e7ee490 | 743 | { |
188963ec | 744 | struct hv_message *msg = context; |
82250213 | 745 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
746 | int size; |
747 | ||
f6feebe0 HZ |
748 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
749 | size = msg->header.payload_size; | |
3e7ee490 | 750 | |
c50f7fb2 | 751 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 752 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 753 | hdr->msgtype, size); |
04f50c4d | 754 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 755 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
756 | return; |
757 | } | |
758 | ||
b7c6b02f S |
759 | if (channel_message_table[hdr->msgtype].message_handler) |
760 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 761 | else |
0a46618d | 762 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
763 | } |
764 | ||
3e189519 | 765 | /* |
e98cb276 | 766 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 767 | */ |
e98cb276 | 768 | int vmbus_request_offers(void) |
3e7ee490 | 769 | { |
82250213 | 770 | struct vmbus_channel_message_header *msg; |
188963ec | 771 | struct vmbus_channel_msginfo *msginfo; |
9568a193 | 772 | int ret, t; |
3e7ee490 | 773 | |
188963ec | 774 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
775 | sizeof(struct vmbus_channel_message_header), |
776 | GFP_KERNEL); | |
188963ec | 777 | if (!msginfo) |
75910f23 | 778 | return -ENOMEM; |
3e7ee490 | 779 | |
9568a193 | 780 | init_completion(&msginfo->waitevent); |
75910f23 | 781 | |
c50f7fb2 | 782 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 783 | |
c50f7fb2 | 784 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 785 | |
3e7ee490 | 786 | |
c6977677 | 787 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
788 | sizeof(struct vmbus_channel_message_header)); |
789 | if (ret != 0) { | |
0a46618d | 790 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 791 | |
0c3b7b2f S |
792 | goto cleanup; |
793 | } | |
3e7ee490 | 794 | |
2dfde964 | 795 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 796 | if (t == 0) { |
0c3b7b2f S |
797 | ret = -ETIMEDOUT; |
798 | goto cleanup; | |
3e7ee490 | 799 | } |
3e7ee490 | 800 | |
3e7ee490 HJ |
801 | |
802 | ||
0c3b7b2f | 803 | cleanup: |
dd9b15dc | 804 | kfree(msginfo); |
3e7ee490 | 805 | |
3e7ee490 HJ |
806 | return ret; |
807 | } | |
808 | ||
e68d2971 S |
809 | /* |
810 | * Retrieve the (sub) channel on which to send an outgoing request. | |
811 | * When a primary channel has multiple sub-channels, we choose a | |
812 | * channel whose VCPU binding is closest to the VCPU on which | |
813 | * this call is being made. | |
814 | */ | |
815 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
816 | { | |
817 | struct list_head *cur, *tmp; | |
818 | int cur_cpu = hv_context.vp_index[smp_processor_id()]; | |
819 | struct vmbus_channel *cur_channel; | |
820 | struct vmbus_channel *outgoing_channel = primary; | |
821 | int cpu_distance, new_cpu_distance; | |
822 | ||
823 | if (list_empty(&primary->sc_list)) | |
824 | return outgoing_channel; | |
825 | ||
826 | list_for_each_safe(cur, tmp, &primary->sc_list) { | |
827 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
828 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
829 | continue; | |
830 | ||
831 | if (cur_channel->target_vp == cur_cpu) | |
832 | return cur_channel; | |
833 | ||
834 | cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ? | |
835 | (outgoing_channel->target_vp - cur_cpu) : | |
836 | (cur_cpu - outgoing_channel->target_vp)); | |
837 | ||
838 | new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ? | |
839 | (cur_channel->target_vp - cur_cpu) : | |
840 | (cur_cpu - cur_channel->target_vp)); | |
841 | ||
842 | if (cpu_distance < new_cpu_distance) | |
843 | continue; | |
844 | ||
845 | outgoing_channel = cur_channel; | |
846 | } | |
847 | ||
848 | return outgoing_channel; | |
849 | } | |
850 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
851 | ||
852 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
853 | { | |
854 | struct list_head *cur, *tmp; | |
855 | struct vmbus_channel *cur_channel; | |
856 | ||
857 | if (primary_channel->sc_creation_callback == NULL) | |
858 | return; | |
859 | ||
860 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
861 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
862 | ||
863 | primary_channel->sc_creation_callback(cur_channel); | |
864 | } | |
865 | } | |
866 | ||
867 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
868 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
869 | { | |
870 | primary_channel->sc_creation_callback = sc_cr_cb; | |
871 | } | |
872 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
873 | ||
874 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
875 | { | |
876 | bool ret; | |
877 | ||
878 | ret = !list_empty(&primary->sc_list); | |
879 | ||
880 | if (ret) { | |
881 | /* | |
882 | * Invoke the callback on sub-channel creation. | |
883 | * This will present a uniform interface to the | |
884 | * clients. | |
885 | */ | |
886 | invoke_sc_cb(primary); | |
887 | } | |
888 | ||
889 | return ret; | |
890 | } | |
891 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |