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; |
4b2f9abe | 219 | |
565ce642 S |
220 | if (channel->device_obj) |
221 | vmbus_device_unregister(channel->device_obj); | |
c8705979 S |
222 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
223 | msg.child_relid = channel->offermsg.child_relid; | |
224 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; | |
225 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
226 | ||
3a28fa35 S |
227 | if (channel->target_cpu != smp_processor_id()) |
228 | smp_call_function_single(channel->target_cpu, | |
229 | percpu_channel_deq, channel, true); | |
230 | else | |
231 | percpu_channel_deq(channel); | |
232 | ||
e68d2971 S |
233 | if (channel->primary_channel == NULL) { |
234 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
235 | list_del(&channel->listentry); | |
236 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
237 | } else { | |
238 | primary_channel = channel->primary_channel; | |
239 | spin_lock_irqsave(&primary_channel->sc_lock, flags); | |
565ce642 | 240 | list_del(&channel->sc_list); |
e68d2971 S |
241 | spin_unlock_irqrestore(&primary_channel->sc_lock, flags); |
242 | } | |
c8705979 | 243 | free_channel(channel); |
4b2f9abe | 244 | } |
8b5d6d3b | 245 | |
93e5bd06 S |
246 | void vmbus_free_channels(void) |
247 | { | |
248 | struct vmbus_channel *channel; | |
249 | ||
250 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
251 | vmbus_device_unregister(channel->device_obj); | |
252 | kfree(channel->device_obj); | |
253 | free_channel(channel); | |
254 | } | |
255 | } | |
256 | ||
3e189519 | 257 | /* |
e98cb276 | 258 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 259 | * associated with this offer |
bd60c33e | 260 | */ |
4b2f9abe | 261 | static void vmbus_process_offer(struct work_struct *work) |
3e7ee490 | 262 | { |
4b2f9abe TT |
263 | struct vmbus_channel *newchannel = container_of(work, |
264 | struct vmbus_channel, | |
265 | work); | |
aded7165 | 266 | struct vmbus_channel *channel; |
188963ec | 267 | bool fnew = true; |
3a28fa35 | 268 | bool enq = false; |
bd60c33e | 269 | int ret; |
0f5e44ca | 270 | unsigned long flags; |
3e7ee490 | 271 | |
4b2f9abe TT |
272 | /* The next possible work is rescind handling */ |
273 | INIT_WORK(&newchannel->work, vmbus_process_rescind_offer); | |
274 | ||
454f18a9 | 275 | /* Make sure this is a new offer */ |
15b2f647 | 276 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 277 | |
da9fcb72 | 278 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
279 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
280 | newchannel->offermsg.offer.if_type) && | |
281 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
282 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 283 | fnew = false; |
3e7ee490 HJ |
284 | break; |
285 | } | |
286 | } | |
287 | ||
3a28fa35 | 288 | if (fnew) { |
c50f7fb2 | 289 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 290 | &vmbus_connection.chn_list); |
3a28fa35 S |
291 | enq = true; |
292 | } | |
bd60c33e | 293 | |
15b2f647 | 294 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 295 | |
3a28fa35 S |
296 | if (enq) { |
297 | if (newchannel->target_cpu != smp_processor_id()) | |
298 | smp_call_function_single(newchannel->target_cpu, | |
299 | percpu_channel_enq, | |
300 | newchannel, true); | |
301 | else | |
302 | percpu_channel_enq(newchannel); | |
303 | } | |
188963ec | 304 | if (!fnew) { |
e68d2971 S |
305 | /* |
306 | * Check to see if this is a sub-channel. | |
307 | */ | |
308 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
309 | /* | |
310 | * Process the sub-channel. | |
311 | */ | |
312 | newchannel->primary_channel = channel; | |
313 | spin_lock_irqsave(&channel->sc_lock, flags); | |
314 | list_add_tail(&newchannel->sc_list, &channel->sc_list); | |
315 | spin_unlock_irqrestore(&channel->sc_lock, flags); | |
3a28fa35 S |
316 | |
317 | if (newchannel->target_cpu != smp_processor_id()) | |
318 | smp_call_function_single(newchannel->target_cpu, | |
319 | percpu_channel_enq, | |
320 | newchannel, true); | |
321 | else | |
322 | percpu_channel_enq(newchannel); | |
323 | ||
e68d2971 S |
324 | newchannel->state = CHANNEL_OPEN_STATE; |
325 | if (channel->sc_creation_callback != NULL) | |
326 | channel->sc_creation_callback(newchannel); | |
327 | ||
328 | return; | |
329 | } | |
330 | ||
e98cb276 | 331 | free_channel(newchannel); |
3e7ee490 HJ |
332 | return; |
333 | } | |
334 | ||
42dceebe S |
335 | /* |
336 | * This state is used to indicate a successful open | |
337 | * so that when we do close the channel normally, we | |
338 | * can cleanup properly | |
339 | */ | |
340 | newchannel->state = CHANNEL_OPEN_STATE; | |
341 | ||
bd60c33e GKH |
342 | /* |
343 | * Start the process of binding this offer to the driver | |
344 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 345 | * vmbus_child_dev_add() |
bd60c33e | 346 | */ |
f2c73011 | 347 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
348 | &newchannel->offermsg.offer.if_type, |
349 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 350 | newchannel); |
3e7ee490 | 351 | |
454f18a9 BP |
352 | /* |
353 | * Add the new device to the bus. This will kick off device-driver | |
354 | * binding which eventually invokes the device driver's AddDevice() | |
355 | * method. | |
356 | */ | |
22794281 | 357 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 358 | if (ret != 0) { |
0a46618d | 359 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 360 | newchannel->offermsg.child_relid); |
3e7ee490 | 361 | |
15b2f647 | 362 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
c50f7fb2 | 363 | list_del(&newchannel->listentry); |
15b2f647 | 364 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
8b8ee675 | 365 | kfree(newchannel->device_obj); |
3e7ee490 | 366 | |
e98cb276 | 367 | free_channel(newchannel); |
3e7ee490 | 368 | } |
3e7ee490 HJ |
369 | } |
370 | ||
a119845f S |
371 | enum { |
372 | IDE = 0, | |
373 | SCSI, | |
374 | NIC, | |
375 | MAX_PERF_CHN, | |
376 | }; | |
377 | ||
378 | /* | |
7fb96565 | 379 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
380 | * We attempt to distribute the interrupt load for these devices across |
381 | * all available CPUs. | |
382 | */ | |
7fb96565 | 383 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 384 | /* IDE */ |
7fb96565 | 385 | { HV_IDE_GUID, }, |
a119845f | 386 | /* Storage - SCSI */ |
7fb96565 | 387 | { HV_SCSI_GUID, }, |
a119845f | 388 | /* Network */ |
7fb96565 | 389 | { HV_NIC_GUID, }, |
a119845f S |
390 | }; |
391 | ||
392 | ||
393 | /* | |
394 | * We use this state to statically distribute the channel interrupt load. | |
395 | */ | |
396 | static u32 next_vp; | |
397 | ||
398 | /* | |
399 | * Starting with Win8, we can statically distribute the incoming | |
400 | * channel interrupt load by binding a channel to VCPU. We | |
401 | * implement here a simple round robin scheme for distributing | |
402 | * the interrupt load. | |
403 | * We will bind channels that are not performance critical to cpu 0 and | |
404 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
405 | * distributed across all available CPUs. | |
406 | */ | |
d3ba720d | 407 | static void init_vp_index(struct vmbus_channel *channel, uuid_le *type_guid) |
a119845f S |
408 | { |
409 | u32 cur_cpu; | |
410 | int i; | |
411 | bool perf_chn = false; | |
412 | u32 max_cpus = num_online_cpus(); | |
413 | ||
414 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 415 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
416 | sizeof(uuid_le))) { |
417 | perf_chn = true; | |
418 | break; | |
419 | } | |
420 | } | |
421 | if ((vmbus_proto_version == VERSION_WS2008) || | |
422 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
423 | /* | |
424 | * Prior to win8, all channel interrupts are | |
425 | * delivered on cpu 0. | |
426 | * Also if the channel is not a performance critical | |
427 | * channel, bind it to cpu 0. | |
428 | */ | |
d3ba720d S |
429 | channel->target_cpu = 0; |
430 | channel->target_vp = 0; | |
431 | return; | |
a119845f S |
432 | } |
433 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
434 | channel->target_cpu = cur_cpu; |
435 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
436 | } |
437 | ||
3e189519 | 438 | /* |
e98cb276 | 439 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 440 | * |
bd60c33e | 441 | */ |
e98cb276 | 442 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 443 | { |
bd60c33e | 444 | struct vmbus_channel_offer_channel *offer; |
188963ec | 445 | struct vmbus_channel *newchannel; |
3e7ee490 | 446 | |
bd60c33e | 447 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 448 | |
454f18a9 | 449 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 450 | newchannel = alloc_channel(); |
188963ec | 451 | if (!newchannel) { |
0a46618d | 452 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
453 | return; |
454 | } | |
455 | ||
132368bd S |
456 | /* |
457 | * By default we setup state to enable batched | |
458 | * reading. A specific service can choose to | |
459 | * disable this prior to opening the channel. | |
460 | */ | |
461 | newchannel->batched_reading = true; | |
462 | ||
b3bf60c7 S |
463 | /* |
464 | * Setup state for signalling the host. | |
465 | */ | |
466 | newchannel->sig_event = (struct hv_input_signal_event *) | |
467 | (ALIGN((unsigned long) | |
468 | &newchannel->sig_buf, | |
469 | HV_HYPERCALL_PARAM_ALIGN)); | |
470 | ||
471 | newchannel->sig_event->connectionid.asu32 = 0; | |
472 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
473 | newchannel->sig_event->flag_number = 0; | |
474 | newchannel->sig_event->rsvdz = 0; | |
475 | ||
476 | if (vmbus_proto_version != VERSION_WS2008) { | |
477 | newchannel->is_dedicated_interrupt = | |
478 | (offer->is_dedicated_interrupt != 0); | |
479 | newchannel->sig_event->connectionid.u.id = | |
480 | offer->connection_id; | |
481 | } | |
482 | ||
d3ba720d | 483 | init_vp_index(newchannel, &offer->offer.if_type); |
abbf3b2a | 484 | |
c50f7fb2 | 485 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 486 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
487 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
488 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 489 | |
4b2f9abe TT |
490 | INIT_WORK(&newchannel->work, vmbus_process_offer); |
491 | queue_work(newchannel->controlwq, &newchannel->work); | |
3e7ee490 HJ |
492 | } |
493 | ||
3e189519 | 494 | /* |
e98cb276 | 495 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
496 | * |
497 | * We queue a work item to process this offer synchronously | |
498 | */ | |
e98cb276 | 499 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 500 | { |
bd60c33e | 501 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 502 | struct vmbus_channel *channel; |
3e7ee490 | 503 | |
bd60c33e | 504 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 505 | channel = relid2channel(rescind->child_relid); |
98e08702 HJ |
506 | |
507 | if (channel == NULL) | |
508 | /* Just return here, no channel found */ | |
3e7ee490 | 509 | return; |
3e7ee490 | 510 | |
4b2f9abe TT |
511 | /* work is initialized for vmbus_process_rescind_offer() from |
512 | * vmbus_process_offer() where the channel got created */ | |
513 | queue_work(channel->controlwq, &channel->work); | |
3e7ee490 HJ |
514 | } |
515 | ||
3e189519 | 516 | /* |
e98cb276 HZ |
517 | * vmbus_onoffers_delivered - |
518 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
519 | * |
520 | * Nothing to do here. | |
521 | */ | |
e98cb276 | 522 | static void vmbus_onoffers_delivered( |
bd60c33e | 523 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 524 | { |
3e7ee490 HJ |
525 | } |
526 | ||
3e189519 | 527 | /* |
e98cb276 | 528 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
529 | * |
530 | * This is invoked when we received a response to our channel open request. | |
531 | * Find the matching request, copy the response and signal the requesting | |
532 | * thread. | |
533 | */ | |
e98cb276 | 534 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 535 | { |
bd60c33e | 536 | struct vmbus_channel_open_result *result; |
188963ec HZ |
537 | struct vmbus_channel_msginfo *msginfo; |
538 | struct vmbus_channel_message_header *requestheader; | |
539 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 540 | unsigned long flags; |
3e7ee490 | 541 | |
bd60c33e | 542 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 543 | |
bd60c33e GKH |
544 | /* |
545 | * Find the open msg, copy the result and signal/unblock the wait event | |
546 | */ | |
15b2f647 | 547 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 548 | |
ebb61e5f HJ |
549 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
550 | msglistentry) { | |
188963ec | 551 | requestheader = |
c50f7fb2 | 552 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 553 | |
c50f7fb2 | 554 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 555 | openmsg = |
c50f7fb2 HZ |
556 | (struct vmbus_channel_open_channel *)msginfo->msg; |
557 | if (openmsg->child_relid == result->child_relid && | |
558 | openmsg->openid == result->openid) { | |
559 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 560 | result, |
9568a193 S |
561 | sizeof( |
562 | struct vmbus_channel_open_result)); | |
563 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
564 | break; |
565 | } | |
566 | } | |
567 | } | |
15b2f647 | 568 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
569 | } |
570 | ||
3e189519 | 571 | /* |
e98cb276 | 572 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
573 | * |
574 | * This is invoked when we received a response to our gpadl create request. | |
575 | * Find the matching request, copy the response and signal the requesting | |
576 | * thread. | |
577 | */ | |
e98cb276 | 578 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 579 | { |
188963ec | 580 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
581 | struct vmbus_channel_msginfo *msginfo; |
582 | struct vmbus_channel_message_header *requestheader; | |
583 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 584 | unsigned long flags; |
3e7ee490 | 585 | |
188963ec | 586 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 587 | |
bd60c33e GKH |
588 | /* |
589 | * Find the establish msg, copy the result and signal/unblock the wait | |
590 | * event | |
591 | */ | |
15b2f647 | 592 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 593 | |
ebb61e5f HJ |
594 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
595 | msglistentry) { | |
188963ec | 596 | requestheader = |
c50f7fb2 | 597 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 598 | |
c50f7fb2 | 599 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
600 | gpadlheader = |
601 | (struct vmbus_channel_gpadl_header *)requestheader; | |
602 | ||
c50f7fb2 HZ |
603 | if ((gpadlcreated->child_relid == |
604 | gpadlheader->child_relid) && | |
605 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
606 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 607 | gpadlcreated, |
9568a193 S |
608 | sizeof( |
609 | struct vmbus_channel_gpadl_created)); | |
610 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
611 | break; |
612 | } | |
613 | } | |
614 | } | |
15b2f647 | 615 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
616 | } |
617 | ||
3e189519 | 618 | /* |
e98cb276 | 619 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
620 | * |
621 | * This is invoked when we received a response to our gpadl teardown request. | |
622 | * Find the matching request, copy the response and signal the requesting | |
623 | * thread. | |
624 | */ | |
e98cb276 | 625 | static void vmbus_ongpadl_torndown( |
bd60c33e | 626 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 627 | { |
188963ec | 628 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
629 | struct vmbus_channel_msginfo *msginfo; |
630 | struct vmbus_channel_message_header *requestheader; | |
631 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 632 | unsigned long flags; |
3e7ee490 | 633 | |
188963ec | 634 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
635 | |
636 | /* | |
637 | * Find the open msg, copy the result and signal/unblock the wait event | |
638 | */ | |
15b2f647 | 639 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 640 | |
ebb61e5f HJ |
641 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
642 | msglistentry) { | |
188963ec | 643 | requestheader = |
c50f7fb2 | 644 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 645 | |
c50f7fb2 | 646 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
647 | gpadl_teardown = |
648 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 649 | |
c50f7fb2 HZ |
650 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
651 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 652 | gpadl_torndown, |
9568a193 S |
653 | sizeof( |
654 | struct vmbus_channel_gpadl_torndown)); | |
655 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
656 | break; |
657 | } | |
658 | } | |
659 | } | |
15b2f647 | 660 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
661 | } |
662 | ||
3e189519 | 663 | /* |
e98cb276 | 664 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
665 | * |
666 | * This is invoked when we received a response to our initiate contact request. | |
667 | * Find the matching request, copy the response and signal the requesting | |
668 | * thread. | |
669 | */ | |
e98cb276 | 670 | static void vmbus_onversion_response( |
bd60c33e | 671 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 672 | { |
188963ec HZ |
673 | struct vmbus_channel_msginfo *msginfo; |
674 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 675 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 676 | unsigned long flags; |
3e7ee490 | 677 | |
188963ec | 678 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 679 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 680 | |
ebb61e5f HJ |
681 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
682 | msglistentry) { | |
188963ec | 683 | requestheader = |
c50f7fb2 | 684 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 685 | |
c50f7fb2 HZ |
686 | if (requestheader->msgtype == |
687 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 688 | memcpy(&msginfo->response.version_response, |
188963ec | 689 | version_response, |
bd60c33e | 690 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 691 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
692 | } |
693 | } | |
15b2f647 | 694 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
695 | } |
696 | ||
c8212f04 GKH |
697 | /* Channel message dispatch table */ |
698 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 699 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
700 | {CHANNELMSG_INVALID, NULL}, |
701 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
702 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
703 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
704 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
705 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
706 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
707 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
708 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
709 | {CHANNELMSG_GPADL_BODY, NULL}, | |
710 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
711 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
712 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
713 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
714 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
715 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
716 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
717 | }; |
718 | ||
3e189519 | 719 | /* |
e98cb276 | 720 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
721 | * |
722 | * This is invoked in the vmbus worker thread context. | |
723 | */ | |
e98cb276 | 724 | void vmbus_onmessage(void *context) |
3e7ee490 | 725 | { |
188963ec | 726 | struct hv_message *msg = context; |
82250213 | 727 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
728 | int size; |
729 | ||
f6feebe0 HZ |
730 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
731 | size = msg->header.payload_size; | |
3e7ee490 | 732 | |
c50f7fb2 | 733 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 734 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 735 | hdr->msgtype, size); |
04f50c4d | 736 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 737 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
738 | return; |
739 | } | |
740 | ||
b7c6b02f S |
741 | if (channel_message_table[hdr->msgtype].message_handler) |
742 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 743 | else |
0a46618d | 744 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
745 | } |
746 | ||
3e189519 | 747 | /* |
e98cb276 | 748 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 749 | */ |
e98cb276 | 750 | int vmbus_request_offers(void) |
3e7ee490 | 751 | { |
82250213 | 752 | struct vmbus_channel_message_header *msg; |
188963ec | 753 | struct vmbus_channel_msginfo *msginfo; |
9568a193 | 754 | int ret, t; |
3e7ee490 | 755 | |
188963ec | 756 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
757 | sizeof(struct vmbus_channel_message_header), |
758 | GFP_KERNEL); | |
188963ec | 759 | if (!msginfo) |
75910f23 | 760 | return -ENOMEM; |
3e7ee490 | 761 | |
9568a193 | 762 | init_completion(&msginfo->waitevent); |
75910f23 | 763 | |
c50f7fb2 | 764 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 765 | |
c50f7fb2 | 766 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 767 | |
3e7ee490 | 768 | |
c6977677 | 769 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
770 | sizeof(struct vmbus_channel_message_header)); |
771 | if (ret != 0) { | |
0a46618d | 772 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 773 | |
0c3b7b2f S |
774 | goto cleanup; |
775 | } | |
3e7ee490 | 776 | |
2dfde964 | 777 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 778 | if (t == 0) { |
0c3b7b2f S |
779 | ret = -ETIMEDOUT; |
780 | goto cleanup; | |
3e7ee490 | 781 | } |
3e7ee490 | 782 | |
3e7ee490 HJ |
783 | |
784 | ||
0c3b7b2f | 785 | cleanup: |
dd9b15dc | 786 | kfree(msginfo); |
3e7ee490 | 787 | |
3e7ee490 HJ |
788 | return ret; |
789 | } | |
790 | ||
e68d2971 S |
791 | /* |
792 | * Retrieve the (sub) channel on which to send an outgoing request. | |
793 | * When a primary channel has multiple sub-channels, we choose a | |
794 | * channel whose VCPU binding is closest to the VCPU on which | |
795 | * this call is being made. | |
796 | */ | |
797 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
798 | { | |
799 | struct list_head *cur, *tmp; | |
800 | int cur_cpu = hv_context.vp_index[smp_processor_id()]; | |
801 | struct vmbus_channel *cur_channel; | |
802 | struct vmbus_channel *outgoing_channel = primary; | |
803 | int cpu_distance, new_cpu_distance; | |
804 | ||
805 | if (list_empty(&primary->sc_list)) | |
806 | return outgoing_channel; | |
807 | ||
808 | list_for_each_safe(cur, tmp, &primary->sc_list) { | |
809 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
810 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
811 | continue; | |
812 | ||
813 | if (cur_channel->target_vp == cur_cpu) | |
814 | return cur_channel; | |
815 | ||
816 | cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ? | |
817 | (outgoing_channel->target_vp - cur_cpu) : | |
818 | (cur_cpu - outgoing_channel->target_vp)); | |
819 | ||
820 | new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ? | |
821 | (cur_channel->target_vp - cur_cpu) : | |
822 | (cur_cpu - cur_channel->target_vp)); | |
823 | ||
824 | if (cpu_distance < new_cpu_distance) | |
825 | continue; | |
826 | ||
827 | outgoing_channel = cur_channel; | |
828 | } | |
829 | ||
830 | return outgoing_channel; | |
831 | } | |
832 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
833 | ||
834 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
835 | { | |
836 | struct list_head *cur, *tmp; | |
837 | struct vmbus_channel *cur_channel; | |
838 | ||
839 | if (primary_channel->sc_creation_callback == NULL) | |
840 | return; | |
841 | ||
842 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
843 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
844 | ||
845 | primary_channel->sc_creation_callback(cur_channel); | |
846 | } | |
847 | } | |
848 | ||
849 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
850 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
851 | { | |
852 | primary_channel->sc_creation_callback = sc_cr_cb; | |
853 | } | |
854 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
855 | ||
856 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
857 | { | |
858 | bool ret; | |
859 | ||
860 | ret = !list_empty(&primary->sc_list); | |
861 | ||
862 | if (ret) { | |
863 | /* | |
864 | * Invoke the callback on sub-channel creation. | |
865 | * This will present a uniform interface to the | |
866 | * clients. | |
867 | */ | |
868 | invoke_sc_cb(primary); | |
869 | } | |
870 | ||
871 | return ret; | |
872 | } | |
873 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |