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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 | |
c88c4e4c | 35 | /** |
da0e9631 | 36 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
37 | * @icmsghdrp: Pointer to msg header structure |
38 | * @icmsg_negotiate: Pointer to negotiate message structure | |
39 | * @buf: Raw buffer channel data | |
40 | * | |
41 | * @icmsghdrp is of type &struct icmsg_hdr. | |
42 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
43 | * Set up and fill in default negotiate response message. |
44 | * | |
6741335b S |
45 | * The fw_version specifies the framework version that |
46 | * we can support and srv_version specifies the service | |
47 | * version we can support. | |
c88c4e4c HJ |
48 | * |
49 | * Mainly used by Hyper-V drivers. | |
50 | */ | |
6741335b | 51 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 52 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 53 | int fw_version, int srv_version) |
c88c4e4c | 54 | { |
6741335b S |
55 | int icframe_major, icframe_minor; |
56 | int icmsg_major, icmsg_minor; | |
57 | int fw_major, fw_minor; | |
58 | int srv_major, srv_minor; | |
c836d0ab | 59 | int i; |
6741335b | 60 | bool found_match = false; |
c836d0ab | 61 | |
a3605300 | 62 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
63 | fw_major = (fw_version >> 16); |
64 | fw_minor = (fw_version & 0xFFFF); | |
65 | ||
66 | srv_major = (srv_version >> 16); | |
67 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 68 | |
a3605300 S |
69 | negop = (struct icmsg_negotiate *)&buf[ |
70 | sizeof(struct vmbuspipe_hdr) + | |
71 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 72 | |
6741335b S |
73 | icframe_major = negop->icframe_vercnt; |
74 | icframe_minor = 0; | |
75 | ||
76 | icmsg_major = negop->icmsg_vercnt; | |
77 | icmsg_minor = 0; | |
c836d0ab S |
78 | |
79 | /* | |
80 | * Select the framework version number we will | |
81 | * support. | |
82 | */ | |
83 | ||
84 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
85 | if ((negop->icversion_data[i].major == fw_major) && |
86 | (negop->icversion_data[i].minor == fw_minor)) { | |
87 | icframe_major = negop->icversion_data[i].major; | |
88 | icframe_minor = negop->icversion_data[i].minor; | |
89 | found_match = true; | |
90 | } | |
c836d0ab S |
91 | } |
92 | ||
6741335b S |
93 | if (!found_match) |
94 | goto fw_error; | |
95 | ||
96 | found_match = false; | |
97 | ||
c836d0ab S |
98 | for (i = negop->icframe_vercnt; |
99 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
100 | if ((negop->icversion_data[i].major == srv_major) && |
101 | (negop->icversion_data[i].minor == srv_minor)) { | |
102 | icmsg_major = negop->icversion_data[i].major; | |
103 | icmsg_minor = negop->icversion_data[i].minor; | |
104 | found_match = true; | |
105 | } | |
c88c4e4c | 106 | } |
a3605300 | 107 | |
c836d0ab | 108 | /* |
6741335b | 109 | * Respond with the framework and service |
c836d0ab S |
110 | * version numbers we can support. |
111 | */ | |
6741335b S |
112 | |
113 | fw_error: | |
114 | if (!found_match) { | |
115 | negop->icframe_vercnt = 0; | |
116 | negop->icmsg_vercnt = 0; | |
117 | } else { | |
118 | negop->icframe_vercnt = 1; | |
119 | negop->icmsg_vercnt = 1; | |
120 | } | |
121 | ||
122 | negop->icversion_data[0].major = icframe_major; | |
123 | negop->icversion_data[0].minor = icframe_minor; | |
124 | negop->icversion_data[1].major = icmsg_major; | |
125 | negop->icversion_data[1].minor = icmsg_minor; | |
126 | return found_match; | |
c88c4e4c | 127 | } |
a3605300 | 128 | |
da0e9631 | 129 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 130 | |
3e189519 | 131 | /* |
e98cb276 | 132 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 133 | */ |
50fe56d2 | 134 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 135 | { |
bc63b6f6 | 136 | static atomic_t chan_num = ATOMIC_INIT(0); |
aded7165 | 137 | struct vmbus_channel *channel; |
3e7ee490 | 138 | |
aded7165 | 139 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 140 | if (!channel) |
3e7ee490 | 141 | return NULL; |
3e7ee490 | 142 | |
bc63b6f6 | 143 | channel->id = atomic_inc_return(&chan_num); |
54411c42 | 144 | spin_lock_init(&channel->inbound_lock); |
67fae053 | 145 | spin_lock_init(&channel->lock); |
e68d2971 S |
146 | |
147 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 148 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 149 | |
bc63b6f6 VK |
150 | channel->controlwq = alloc_workqueue("hv_vmbus_ctl/%d", WQ_MEM_RECLAIM, |
151 | 1, channel->id); | |
c50f7fb2 | 152 | if (!channel->controlwq) { |
8c69f52a | 153 | kfree(channel); |
3e7ee490 HJ |
154 | return NULL; |
155 | } | |
156 | ||
157 | return channel; | |
158 | } | |
159 | ||
3e189519 | 160 | /* |
e98cb276 | 161 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 162 | */ |
4b2f9abe | 163 | static void release_channel(struct work_struct *work) |
3e7ee490 | 164 | { |
4b2f9abe TT |
165 | struct vmbus_channel *channel = container_of(work, |
166 | struct vmbus_channel, | |
167 | work); | |
3e7ee490 | 168 | |
c50f7fb2 | 169 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 170 | |
8c69f52a | 171 | kfree(channel); |
3e7ee490 HJ |
172 | } |
173 | ||
3e189519 | 174 | /* |
e98cb276 | 175 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 176 | */ |
9f3e28e3 | 177 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 178 | { |
3e7ee490 | 179 | |
bd60c33e GKH |
180 | /* |
181 | * We have to release the channel's workqueue/thread in the vmbus's | |
182 | * workqueue/thread context | |
183 | * ie we can't destroy ourselves. | |
184 | */ | |
4b2f9abe | 185 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 186 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
187 | } |
188 | ||
3a28fa35 S |
189 | static void percpu_channel_enq(void *arg) |
190 | { | |
191 | struct vmbus_channel *channel = arg; | |
192 | int cpu = smp_processor_id(); | |
193 | ||
194 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
195 | } | |
8b5d6d3b | 196 | |
3a28fa35 S |
197 | static void percpu_channel_deq(void *arg) |
198 | { | |
199 | struct vmbus_channel *channel = arg; | |
200 | ||
201 | list_del(&channel->percpu_list); | |
202 | } | |
8b5d6d3b | 203 | |
ed6cfcc5 S |
204 | |
205 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) | |
4b2f9abe | 206 | { |
ed6cfcc5 | 207 | struct vmbus_channel_relid_released msg; |
c8705979 | 208 | unsigned long flags; |
e68d2971 | 209 | struct vmbus_channel *primary_channel; |
4b2f9abe | 210 | |
c8705979 | 211 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 212 | msg.child_relid = relid; |
c8705979 S |
213 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
214 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
215 | ||
ed6cfcc5 S |
216 | if (channel == NULL) |
217 | return; | |
218 | ||
2115b561 S |
219 | if (channel->target_cpu != get_cpu()) { |
220 | put_cpu(); | |
3a28fa35 S |
221 | smp_call_function_single(channel->target_cpu, |
222 | percpu_channel_deq, channel, true); | |
2115b561 | 223 | } else { |
3a28fa35 | 224 | percpu_channel_deq(channel); |
2115b561 S |
225 | put_cpu(); |
226 | } | |
3a28fa35 | 227 | |
e68d2971 S |
228 | if (channel->primary_channel == NULL) { |
229 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
230 | list_del(&channel->listentry); | |
231 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
232 | } else { | |
233 | primary_channel = channel->primary_channel; | |
67fae053 | 234 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 235 | list_del(&channel->sc_list); |
67fae053 | 236 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 237 | } |
c8705979 | 238 | free_channel(channel); |
4b2f9abe | 239 | } |
8b5d6d3b | 240 | |
93e5bd06 S |
241 | void vmbus_free_channels(void) |
242 | { | |
243 | struct vmbus_channel *channel; | |
244 | ||
245 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
246 | vmbus_device_unregister(channel->device_obj); | |
93e5bd06 S |
247 | free_channel(channel); |
248 | } | |
249 | } | |
250 | ||
3e189519 | 251 | /* |
e98cb276 | 252 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 253 | * associated with this offer |
bd60c33e | 254 | */ |
2dd37cb8 | 255 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 256 | { |
aded7165 | 257 | struct vmbus_channel *channel; |
188963ec | 258 | bool fnew = true; |
3a28fa35 | 259 | bool enq = false; |
0f5e44ca | 260 | unsigned long flags; |
3e7ee490 | 261 | |
454f18a9 | 262 | /* Make sure this is a new offer */ |
15b2f647 | 263 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 264 | |
da9fcb72 | 265 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
266 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
267 | newchannel->offermsg.offer.if_type) && | |
268 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
269 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 270 | fnew = false; |
3e7ee490 HJ |
271 | break; |
272 | } | |
273 | } | |
274 | ||
3a28fa35 | 275 | if (fnew) { |
c50f7fb2 | 276 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 277 | &vmbus_connection.chn_list); |
3a28fa35 S |
278 | enq = true; |
279 | } | |
bd60c33e | 280 | |
15b2f647 | 281 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 282 | |
3a28fa35 | 283 | if (enq) { |
2115b561 S |
284 | if (newchannel->target_cpu != get_cpu()) { |
285 | put_cpu(); | |
3a28fa35 S |
286 | smp_call_function_single(newchannel->target_cpu, |
287 | percpu_channel_enq, | |
288 | newchannel, true); | |
2115b561 | 289 | } else { |
3a28fa35 | 290 | percpu_channel_enq(newchannel); |
2115b561 S |
291 | put_cpu(); |
292 | } | |
3a28fa35 | 293 | } |
188963ec | 294 | if (!fnew) { |
e68d2971 S |
295 | /* |
296 | * Check to see if this is a sub-channel. | |
297 | */ | |
298 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
299 | /* | |
300 | * Process the sub-channel. | |
301 | */ | |
302 | newchannel->primary_channel = channel; | |
67fae053 | 303 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 304 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
67fae053 | 305 | spin_unlock_irqrestore(&channel->lock, flags); |
3a28fa35 | 306 | |
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 | |
e68d2971 | 317 | newchannel->state = CHANNEL_OPEN_STATE; |
a13e8bbe | 318 | channel->num_sc++; |
d43e2fe7 DC |
319 | if (channel->sc_creation_callback != NULL) |
320 | channel->sc_creation_callback(newchannel); | |
2dd37cb8 S |
321 | |
322 | return; | |
e68d2971 S |
323 | } |
324 | ||
9c3a6f7e | 325 | goto err_free_chan; |
3e7ee490 HJ |
326 | } |
327 | ||
42dceebe S |
328 | /* |
329 | * This state is used to indicate a successful open | |
330 | * so that when we do close the channel normally, we | |
331 | * can cleanup properly | |
332 | */ | |
333 | newchannel->state = CHANNEL_OPEN_STATE; | |
334 | ||
bd60c33e GKH |
335 | /* |
336 | * Start the process of binding this offer to the driver | |
337 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 338 | * vmbus_child_dev_add() |
bd60c33e | 339 | */ |
f2c73011 | 340 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
341 | &newchannel->offermsg.offer.if_type, |
342 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 343 | newchannel); |
9c3a6f7e | 344 | if (!newchannel->device_obj) |
5b1e5b53 | 345 | goto err_deq_chan; |
3e7ee490 | 346 | |
454f18a9 BP |
347 | /* |
348 | * Add the new device to the bus. This will kick off device-driver | |
349 | * binding which eventually invokes the device driver's AddDevice() | |
350 | * method. | |
351 | */ | |
d43e2fe7 DC |
352 | if (vmbus_device_register(newchannel->device_obj) != 0) { |
353 | pr_err("unable to add child device object (relid %d)\n", | |
354 | newchannel->offermsg.child_relid); | |
355 | kfree(newchannel->device_obj); | |
356 | goto err_deq_chan; | |
357 | } | |
9c3a6f7e | 358 | return; |
2dd37cb8 | 359 | |
5b1e5b53 S |
360 | err_deq_chan: |
361 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
362 | list_del(&newchannel->listentry); | |
363 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
364 | ||
365 | if (newchannel->target_cpu != get_cpu()) { | |
366 | put_cpu(); | |
367 | smp_call_function_single(newchannel->target_cpu, | |
368 | percpu_channel_deq, newchannel, true); | |
369 | } else { | |
370 | percpu_channel_deq(newchannel); | |
371 | put_cpu(); | |
372 | } | |
373 | ||
9c3a6f7e VK |
374 | err_free_chan: |
375 | free_channel(newchannel); | |
3e7ee490 HJ |
376 | } |
377 | ||
a119845f S |
378 | enum { |
379 | IDE = 0, | |
380 | SCSI, | |
381 | NIC, | |
382 | MAX_PERF_CHN, | |
383 | }; | |
384 | ||
385 | /* | |
7fb96565 | 386 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
387 | * We attempt to distribute the interrupt load for these devices across |
388 | * all available CPUs. | |
389 | */ | |
7fb96565 | 390 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 391 | /* IDE */ |
7fb96565 | 392 | { HV_IDE_GUID, }, |
a119845f | 393 | /* Storage - SCSI */ |
7fb96565 | 394 | { HV_SCSI_GUID, }, |
a119845f | 395 | /* Network */ |
7fb96565 | 396 | { HV_NIC_GUID, }, |
04653a00 S |
397 | /* NetworkDirect Guest RDMA */ |
398 | { HV_ND_GUID, }, | |
a119845f S |
399 | }; |
400 | ||
401 | ||
402 | /* | |
403 | * We use this state to statically distribute the channel interrupt load. | |
404 | */ | |
405 | static u32 next_vp; | |
406 | ||
407 | /* | |
408 | * Starting with Win8, we can statically distribute the incoming | |
409 | * channel interrupt load by binding a channel to VCPU. We | |
410 | * implement here a simple round robin scheme for distributing | |
411 | * the interrupt load. | |
412 | * We will bind channels that are not performance critical to cpu 0 and | |
413 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
414 | * distributed across all available CPUs. | |
415 | */ | |
f9da455b | 416 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
417 | { |
418 | u32 cur_cpu; | |
419 | int i; | |
420 | bool perf_chn = false; | |
421 | u32 max_cpus = num_online_cpus(); | |
422 | ||
423 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 424 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
425 | sizeof(uuid_le))) { |
426 | perf_chn = true; | |
427 | break; | |
428 | } | |
429 | } | |
430 | if ((vmbus_proto_version == VERSION_WS2008) || | |
431 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
432 | /* | |
433 | * Prior to win8, all channel interrupts are | |
434 | * delivered on cpu 0. | |
435 | * Also if the channel is not a performance critical | |
436 | * channel, bind it to cpu 0. | |
437 | */ | |
d3ba720d S |
438 | channel->target_cpu = 0; |
439 | channel->target_vp = 0; | |
440 | return; | |
a119845f S |
441 | } |
442 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
443 | channel->target_cpu = cur_cpu; |
444 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
445 | } |
446 | ||
3e189519 | 447 | /* |
e98cb276 | 448 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 449 | * |
bd60c33e | 450 | */ |
e98cb276 | 451 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 452 | { |
bd60c33e | 453 | struct vmbus_channel_offer_channel *offer; |
188963ec | 454 | struct vmbus_channel *newchannel; |
3e7ee490 | 455 | |
bd60c33e | 456 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 457 | |
454f18a9 | 458 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 459 | newchannel = alloc_channel(); |
188963ec | 460 | if (!newchannel) { |
0a46618d | 461 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
462 | return; |
463 | } | |
464 | ||
132368bd S |
465 | /* |
466 | * By default we setup state to enable batched | |
467 | * reading. A specific service can choose to | |
468 | * disable this prior to opening the channel. | |
469 | */ | |
470 | newchannel->batched_reading = true; | |
471 | ||
b3bf60c7 S |
472 | /* |
473 | * Setup state for signalling the host. | |
474 | */ | |
475 | newchannel->sig_event = (struct hv_input_signal_event *) | |
476 | (ALIGN((unsigned long) | |
477 | &newchannel->sig_buf, | |
478 | HV_HYPERCALL_PARAM_ALIGN)); | |
479 | ||
480 | newchannel->sig_event->connectionid.asu32 = 0; | |
481 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
482 | newchannel->sig_event->flag_number = 0; | |
483 | newchannel->sig_event->rsvdz = 0; | |
484 | ||
485 | if (vmbus_proto_version != VERSION_WS2008) { | |
486 | newchannel->is_dedicated_interrupt = | |
487 | (offer->is_dedicated_interrupt != 0); | |
488 | newchannel->sig_event->connectionid.u.id = | |
489 | offer->connection_id; | |
490 | } | |
491 | ||
d3ba720d | 492 | init_vp_index(newchannel, &offer->offer.if_type); |
abbf3b2a | 493 | |
c50f7fb2 | 494 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 495 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
496 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
497 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 498 | |
2dd37cb8 | 499 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
500 | } |
501 | ||
3e189519 | 502 | /* |
e98cb276 | 503 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
504 | * |
505 | * We queue a work item to process this offer synchronously | |
506 | */ | |
e98cb276 | 507 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 508 | { |
bd60c33e | 509 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 510 | struct vmbus_channel *channel; |
d43e2fe7 DC |
511 | unsigned long flags; |
512 | struct device *dev; | |
3e7ee490 | 513 | |
bd60c33e | 514 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
d43e2fe7 | 515 | channel = relid2channel(rescind->child_relid); |
98e08702 | 516 | |
2dd37cb8 S |
517 | if (channel == NULL) { |
518 | hv_process_channel_removal(NULL, rescind->child_relid); | |
3e7ee490 | 519 | return; |
2dd37cb8 | 520 | } |
3e7ee490 | 521 | |
d43e2fe7 DC |
522 | spin_lock_irqsave(&channel->lock, flags); |
523 | channel->rescind = true; | |
524 | spin_unlock_irqrestore(&channel->lock, flags); | |
525 | ||
526 | if (channel->device_obj) { | |
527 | /* | |
528 | * We will have to unregister this device from the | |
529 | * driver core. | |
530 | */ | |
531 | dev = get_device(&channel->device_obj->device); | |
532 | if (dev) { | |
533 | vmbus_device_unregister(channel->device_obj); | |
534 | put_device(dev); | |
535 | } | |
536 | } else { | |
537 | hv_process_channel_removal(channel, | |
538 | channel->offermsg.child_relid); | |
2dd37cb8 | 539 | } |
3e7ee490 HJ |
540 | } |
541 | ||
3e189519 | 542 | /* |
e98cb276 HZ |
543 | * vmbus_onoffers_delivered - |
544 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
545 | * |
546 | * Nothing to do here. | |
547 | */ | |
e98cb276 | 548 | static void vmbus_onoffers_delivered( |
bd60c33e | 549 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 550 | { |
3e7ee490 HJ |
551 | } |
552 | ||
3e189519 | 553 | /* |
e98cb276 | 554 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
555 | * |
556 | * This is invoked when we received a response to our channel open request. | |
557 | * Find the matching request, copy the response and signal the requesting | |
558 | * thread. | |
559 | */ | |
e98cb276 | 560 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 561 | { |
bd60c33e | 562 | struct vmbus_channel_open_result *result; |
188963ec HZ |
563 | struct vmbus_channel_msginfo *msginfo; |
564 | struct vmbus_channel_message_header *requestheader; | |
565 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 566 | unsigned long flags; |
3e7ee490 | 567 | |
bd60c33e | 568 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 569 | |
bd60c33e GKH |
570 | /* |
571 | * Find the open msg, copy the result and signal/unblock the wait event | |
572 | */ | |
15b2f647 | 573 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 574 | |
ebb61e5f HJ |
575 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
576 | msglistentry) { | |
188963ec | 577 | requestheader = |
c50f7fb2 | 578 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 579 | |
c50f7fb2 | 580 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 581 | openmsg = |
c50f7fb2 HZ |
582 | (struct vmbus_channel_open_channel *)msginfo->msg; |
583 | if (openmsg->child_relid == result->child_relid && | |
584 | openmsg->openid == result->openid) { | |
585 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 586 | result, |
9568a193 S |
587 | sizeof( |
588 | struct vmbus_channel_open_result)); | |
589 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
590 | break; |
591 | } | |
592 | } | |
593 | } | |
15b2f647 | 594 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
595 | } |
596 | ||
3e189519 | 597 | /* |
e98cb276 | 598 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
599 | * |
600 | * This is invoked when we received a response to our gpadl create request. | |
601 | * Find the matching request, copy the response and signal the requesting | |
602 | * thread. | |
603 | */ | |
e98cb276 | 604 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 605 | { |
188963ec | 606 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
607 | struct vmbus_channel_msginfo *msginfo; |
608 | struct vmbus_channel_message_header *requestheader; | |
609 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 610 | unsigned long flags; |
3e7ee490 | 611 | |
188963ec | 612 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 613 | |
bd60c33e GKH |
614 | /* |
615 | * Find the establish msg, copy the result and signal/unblock the wait | |
616 | * event | |
617 | */ | |
15b2f647 | 618 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 619 | |
ebb61e5f HJ |
620 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
621 | msglistentry) { | |
188963ec | 622 | requestheader = |
c50f7fb2 | 623 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 624 | |
c50f7fb2 | 625 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
626 | gpadlheader = |
627 | (struct vmbus_channel_gpadl_header *)requestheader; | |
628 | ||
c50f7fb2 HZ |
629 | if ((gpadlcreated->child_relid == |
630 | gpadlheader->child_relid) && | |
631 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
632 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 633 | gpadlcreated, |
9568a193 S |
634 | sizeof( |
635 | struct vmbus_channel_gpadl_created)); | |
636 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
637 | break; |
638 | } | |
639 | } | |
640 | } | |
15b2f647 | 641 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
642 | } |
643 | ||
3e189519 | 644 | /* |
e98cb276 | 645 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
646 | * |
647 | * This is invoked when we received a response to our gpadl teardown request. | |
648 | * Find the matching request, copy the response and signal the requesting | |
649 | * thread. | |
650 | */ | |
e98cb276 | 651 | static void vmbus_ongpadl_torndown( |
bd60c33e | 652 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 653 | { |
188963ec | 654 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
655 | struct vmbus_channel_msginfo *msginfo; |
656 | struct vmbus_channel_message_header *requestheader; | |
657 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 658 | unsigned long flags; |
3e7ee490 | 659 | |
188963ec | 660 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
661 | |
662 | /* | |
663 | * Find the open msg, copy the result and signal/unblock the wait event | |
664 | */ | |
15b2f647 | 665 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 666 | |
ebb61e5f HJ |
667 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
668 | msglistentry) { | |
188963ec | 669 | requestheader = |
c50f7fb2 | 670 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 671 | |
c50f7fb2 | 672 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
673 | gpadl_teardown = |
674 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 675 | |
c50f7fb2 HZ |
676 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
677 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 678 | gpadl_torndown, |
9568a193 S |
679 | sizeof( |
680 | struct vmbus_channel_gpadl_torndown)); | |
681 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
682 | break; |
683 | } | |
684 | } | |
685 | } | |
15b2f647 | 686 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
687 | } |
688 | ||
3e189519 | 689 | /* |
e98cb276 | 690 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
691 | * |
692 | * This is invoked when we received a response to our initiate contact request. | |
693 | * Find the matching request, copy the response and signal the requesting | |
694 | * thread. | |
695 | */ | |
e98cb276 | 696 | static void vmbus_onversion_response( |
bd60c33e | 697 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 698 | { |
188963ec HZ |
699 | struct vmbus_channel_msginfo *msginfo; |
700 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 701 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 702 | unsigned long flags; |
3e7ee490 | 703 | |
188963ec | 704 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 705 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 706 | |
ebb61e5f HJ |
707 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
708 | msglistentry) { | |
188963ec | 709 | requestheader = |
c50f7fb2 | 710 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 711 | |
c50f7fb2 HZ |
712 | if (requestheader->msgtype == |
713 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 714 | memcpy(&msginfo->response.version_response, |
188963ec | 715 | version_response, |
bd60c33e | 716 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 717 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
718 | } |
719 | } | |
15b2f647 | 720 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
721 | } |
722 | ||
c8212f04 | 723 | /* Channel message dispatch table */ |
652594c7 | 724 | struct vmbus_channel_message_table_entry |
b7c6b02f | 725 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
726 | {CHANNELMSG_INVALID, 0, NULL}, |
727 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
728 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
729 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
730 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
731 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
732 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
733 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
734 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
735 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
736 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
737 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
738 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
739 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
740 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
741 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
742 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
c8212f04 GKH |
743 | }; |
744 | ||
3e189519 | 745 | /* |
e98cb276 | 746 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
747 | * |
748 | * This is invoked in the vmbus worker thread context. | |
749 | */ | |
e98cb276 | 750 | void vmbus_onmessage(void *context) |
3e7ee490 | 751 | { |
188963ec | 752 | struct hv_message *msg = context; |
82250213 | 753 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
754 | int size; |
755 | ||
f6feebe0 HZ |
756 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
757 | size = msg->header.payload_size; | |
3e7ee490 | 758 | |
c50f7fb2 | 759 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 760 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 761 | hdr->msgtype, size); |
04f50c4d | 762 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 763 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
764 | return; |
765 | } | |
766 | ||
b7c6b02f S |
767 | if (channel_message_table[hdr->msgtype].message_handler) |
768 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 769 | else |
0a46618d | 770 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
771 | } |
772 | ||
3e189519 | 773 | /* |
e98cb276 | 774 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 775 | */ |
e98cb276 | 776 | int vmbus_request_offers(void) |
3e7ee490 | 777 | { |
82250213 | 778 | struct vmbus_channel_message_header *msg; |
188963ec | 779 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 780 | int ret; |
3e7ee490 | 781 | |
188963ec | 782 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
783 | sizeof(struct vmbus_channel_message_header), |
784 | GFP_KERNEL); | |
188963ec | 785 | if (!msginfo) |
75910f23 | 786 | return -ENOMEM; |
3e7ee490 | 787 | |
c50f7fb2 | 788 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 789 | |
c50f7fb2 | 790 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 791 | |
3e7ee490 | 792 | |
c6977677 | 793 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
794 | sizeof(struct vmbus_channel_message_header)); |
795 | if (ret != 0) { | |
0a46618d | 796 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 797 | |
0c3b7b2f S |
798 | goto cleanup; |
799 | } | |
3e7ee490 | 800 | |
0c3b7b2f | 801 | cleanup: |
dd9b15dc | 802 | kfree(msginfo); |
3e7ee490 | 803 | |
3e7ee490 HJ |
804 | return ret; |
805 | } | |
806 | ||
e68d2971 S |
807 | /* |
808 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
809 | * When a primary channel has multiple sub-channels, we try to |
810 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
811 | */ |
812 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
813 | { | |
814 | struct list_head *cur, *tmp; | |
87712bf8 | 815 | int cur_cpu; |
e68d2971 S |
816 | struct vmbus_channel *cur_channel; |
817 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
818 | int next_channel; |
819 | int i = 1; | |
e68d2971 S |
820 | |
821 | if (list_empty(&primary->sc_list)) | |
822 | return outgoing_channel; | |
823 | ||
a13e8bbe S |
824 | next_channel = primary->next_oc++; |
825 | ||
826 | if (next_channel > (primary->num_sc)) { | |
827 | primary->next_oc = 0; | |
828 | return outgoing_channel; | |
829 | } | |
830 | ||
87712bf8 S |
831 | cur_cpu = hv_context.vp_index[get_cpu()]; |
832 | put_cpu(); | |
e68d2971 S |
833 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
834 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
835 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
836 | continue; | |
837 | ||
838 | if (cur_channel->target_vp == cur_cpu) | |
839 | return cur_channel; | |
840 | ||
a13e8bbe S |
841 | if (i == next_channel) |
842 | return cur_channel; | |
e68d2971 | 843 | |
a13e8bbe | 844 | i++; |
e68d2971 S |
845 | } |
846 | ||
847 | return outgoing_channel; | |
848 | } | |
849 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
850 | ||
851 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
852 | { | |
853 | struct list_head *cur, *tmp; | |
854 | struct vmbus_channel *cur_channel; | |
855 | ||
856 | if (primary_channel->sc_creation_callback == NULL) | |
857 | return; | |
858 | ||
859 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
860 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
861 | ||
862 | primary_channel->sc_creation_callback(cur_channel); | |
863 | } | |
864 | } | |
865 | ||
866 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
867 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
868 | { | |
869 | primary_channel->sc_creation_callback = sc_cr_cb; | |
870 | } | |
871 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
872 | ||
873 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
874 | { | |
875 | bool ret; | |
876 | ||
877 | ret = !list_empty(&primary->sc_list); | |
878 | ||
879 | if (ret) { | |
880 | /* | |
881 | * Invoke the callback on sub-channel creation. | |
882 | * This will present a uniform interface to the | |
883 | * clients. | |
884 | */ | |
885 | invoke_sc_cb(primary); | |
886 | } | |
887 | ||
888 | return ret; | |
889 | } | |
890 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |