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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 | |
3e7ee490 HJ |
150 | return channel; |
151 | } | |
152 | ||
3e189519 | 153 | /* |
e98cb276 | 154 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 155 | */ |
9f3e28e3 | 156 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 157 | { |
aadc3780 | 158 | kfree(channel); |
3e7ee490 HJ |
159 | } |
160 | ||
3a28fa35 S |
161 | static void percpu_channel_enq(void *arg) |
162 | { | |
163 | struct vmbus_channel *channel = arg; | |
164 | int cpu = smp_processor_id(); | |
165 | ||
166 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
167 | } | |
8b5d6d3b | 168 | |
3a28fa35 S |
169 | static void percpu_channel_deq(void *arg) |
170 | { | |
171 | struct vmbus_channel *channel = arg; | |
172 | ||
173 | list_del(&channel->percpu_list); | |
174 | } | |
8b5d6d3b | 175 | |
ed6cfcc5 S |
176 | |
177 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) | |
4b2f9abe | 178 | { |
ed6cfcc5 | 179 | struct vmbus_channel_relid_released msg; |
c8705979 | 180 | unsigned long flags; |
e68d2971 | 181 | struct vmbus_channel *primary_channel; |
4b2f9abe | 182 | |
c8705979 | 183 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 184 | msg.child_relid = relid; |
c8705979 S |
185 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
186 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
187 | ||
ed6cfcc5 S |
188 | if (channel == NULL) |
189 | return; | |
190 | ||
2115b561 S |
191 | if (channel->target_cpu != get_cpu()) { |
192 | put_cpu(); | |
3a28fa35 S |
193 | smp_call_function_single(channel->target_cpu, |
194 | percpu_channel_deq, channel, true); | |
2115b561 | 195 | } else { |
3a28fa35 | 196 | percpu_channel_deq(channel); |
2115b561 S |
197 | put_cpu(); |
198 | } | |
3a28fa35 | 199 | |
e68d2971 S |
200 | if (channel->primary_channel == NULL) { |
201 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
202 | list_del(&channel->listentry); | |
203 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
204 | } else { | |
205 | primary_channel = channel->primary_channel; | |
67fae053 | 206 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 207 | list_del(&channel->sc_list); |
357e836a | 208 | primary_channel->num_sc--; |
67fae053 | 209 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 210 | } |
c8705979 | 211 | free_channel(channel); |
4b2f9abe | 212 | } |
8b5d6d3b | 213 | |
93e5bd06 S |
214 | void vmbus_free_channels(void) |
215 | { | |
813c5b79 DC |
216 | struct vmbus_channel *channel, *tmp; |
217 | ||
218 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
219 | listentry) { | |
220 | /* if we don't set rescind to true, vmbus_close_internal() | |
221 | * won't invoke hv_process_channel_removal(). | |
222 | */ | |
223 | channel->rescind = true; | |
93e5bd06 | 224 | |
93e5bd06 | 225 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
226 | } |
227 | } | |
228 | ||
3e189519 | 229 | /* |
e98cb276 | 230 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 231 | * associated with this offer |
bd60c33e | 232 | */ |
2dd37cb8 | 233 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 234 | { |
aded7165 | 235 | struct vmbus_channel *channel; |
188963ec | 236 | bool fnew = true; |
0f5e44ca | 237 | unsigned long flags; |
3e7ee490 | 238 | |
454f18a9 | 239 | /* Make sure this is a new offer */ |
15b2f647 | 240 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 241 | |
da9fcb72 | 242 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
243 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
244 | newchannel->offermsg.offer.if_type) && | |
245 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
246 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 247 | fnew = false; |
3e7ee490 HJ |
248 | break; |
249 | } | |
250 | } | |
251 | ||
8dfd3326 | 252 | if (fnew) |
c50f7fb2 | 253 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 254 | &vmbus_connection.chn_list); |
bd60c33e | 255 | |
15b2f647 | 256 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 257 | |
188963ec | 258 | if (!fnew) { |
e68d2971 S |
259 | /* |
260 | * Check to see if this is a sub-channel. | |
261 | */ | |
262 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
263 | /* | |
264 | * Process the sub-channel. | |
265 | */ | |
266 | newchannel->primary_channel = channel; | |
67fae053 | 267 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 268 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 269 | channel->num_sc++; |
357e836a | 270 | spin_unlock_irqrestore(&channel->lock, flags); |
8dfd3326 VK |
271 | } else |
272 | goto err_free_chan; | |
273 | } | |
e68d2971 | 274 | |
8dfd3326 VK |
275 | if (newchannel->target_cpu != get_cpu()) { |
276 | put_cpu(); | |
277 | smp_call_function_single(newchannel->target_cpu, | |
278 | percpu_channel_enq, | |
279 | newchannel, true); | |
280 | } else { | |
281 | percpu_channel_enq(newchannel); | |
282 | put_cpu(); | |
3e7ee490 HJ |
283 | } |
284 | ||
42dceebe S |
285 | /* |
286 | * This state is used to indicate a successful open | |
287 | * so that when we do close the channel normally, we | |
288 | * can cleanup properly | |
289 | */ | |
290 | newchannel->state = CHANNEL_OPEN_STATE; | |
291 | ||
8dfd3326 VK |
292 | if (!fnew) { |
293 | if (channel->sc_creation_callback != NULL) | |
294 | channel->sc_creation_callback(newchannel); | |
295 | return; | |
296 | } | |
297 | ||
bd60c33e GKH |
298 | /* |
299 | * Start the process of binding this offer to the driver | |
300 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 301 | * vmbus_child_dev_add() |
bd60c33e | 302 | */ |
f2c73011 | 303 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
304 | &newchannel->offermsg.offer.if_type, |
305 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 306 | newchannel); |
9c3a6f7e | 307 | if (!newchannel->device_obj) |
5b1e5b53 | 308 | goto err_deq_chan; |
3e7ee490 | 309 | |
454f18a9 BP |
310 | /* |
311 | * Add the new device to the bus. This will kick off device-driver | |
312 | * binding which eventually invokes the device driver's AddDevice() | |
313 | * method. | |
314 | */ | |
d43e2fe7 DC |
315 | if (vmbus_device_register(newchannel->device_obj) != 0) { |
316 | pr_err("unable to add child device object (relid %d)\n", | |
317 | newchannel->offermsg.child_relid); | |
318 | kfree(newchannel->device_obj); | |
319 | goto err_deq_chan; | |
320 | } | |
9c3a6f7e | 321 | return; |
2dd37cb8 | 322 | |
5b1e5b53 S |
323 | err_deq_chan: |
324 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
325 | list_del(&newchannel->listentry); | |
326 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
327 | ||
328 | if (newchannel->target_cpu != get_cpu()) { | |
329 | put_cpu(); | |
330 | smp_call_function_single(newchannel->target_cpu, | |
331 | percpu_channel_deq, newchannel, true); | |
332 | } else { | |
333 | percpu_channel_deq(newchannel); | |
334 | put_cpu(); | |
335 | } | |
336 | ||
9c3a6f7e VK |
337 | err_free_chan: |
338 | free_channel(newchannel); | |
3e7ee490 HJ |
339 | } |
340 | ||
a119845f S |
341 | enum { |
342 | IDE = 0, | |
343 | SCSI, | |
344 | NIC, | |
345 | MAX_PERF_CHN, | |
346 | }; | |
347 | ||
348 | /* | |
7fb96565 | 349 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
350 | * We attempt to distribute the interrupt load for these devices across |
351 | * all available CPUs. | |
352 | */ | |
7fb96565 | 353 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 354 | /* IDE */ |
7fb96565 | 355 | { HV_IDE_GUID, }, |
a119845f | 356 | /* Storage - SCSI */ |
7fb96565 | 357 | { HV_SCSI_GUID, }, |
a119845f | 358 | /* Network */ |
7fb96565 | 359 | { HV_NIC_GUID, }, |
04653a00 S |
360 | /* NetworkDirect Guest RDMA */ |
361 | { HV_ND_GUID, }, | |
a119845f S |
362 | }; |
363 | ||
364 | ||
365 | /* | |
366 | * We use this state to statically distribute the channel interrupt load. | |
367 | */ | |
368 | static u32 next_vp; | |
369 | ||
370 | /* | |
371 | * Starting with Win8, we can statically distribute the incoming | |
372 | * channel interrupt load by binding a channel to VCPU. We | |
373 | * implement here a simple round robin scheme for distributing | |
374 | * the interrupt load. | |
375 | * We will bind channels that are not performance critical to cpu 0 and | |
376 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
377 | * distributed across all available CPUs. | |
378 | */ | |
f9da455b | 379 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
380 | { |
381 | u32 cur_cpu; | |
382 | int i; | |
383 | bool perf_chn = false; | |
384 | u32 max_cpus = num_online_cpus(); | |
385 | ||
386 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 387 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
388 | sizeof(uuid_le))) { |
389 | perf_chn = true; | |
390 | break; | |
391 | } | |
392 | } | |
393 | if ((vmbus_proto_version == VERSION_WS2008) || | |
394 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
395 | /* | |
396 | * Prior to win8, all channel interrupts are | |
397 | * delivered on cpu 0. | |
398 | * Also if the channel is not a performance critical | |
399 | * channel, bind it to cpu 0. | |
400 | */ | |
d3ba720d S |
401 | channel->target_cpu = 0; |
402 | channel->target_vp = 0; | |
403 | return; | |
a119845f S |
404 | } |
405 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
406 | channel->target_cpu = cur_cpu; |
407 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
408 | } |
409 | ||
2db84eff S |
410 | /* |
411 | * vmbus_unload_response - Handler for the unload response. | |
412 | */ | |
413 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
414 | { | |
415 | /* | |
416 | * This is a global event; just wakeup the waiting thread. | |
417 | * Once we successfully unload, we can cleanup the monitor state. | |
418 | */ | |
419 | complete(&vmbus_connection.unload_event); | |
420 | } | |
421 | ||
422 | void vmbus_initiate_unload(void) | |
423 | { | |
424 | struct vmbus_channel_message_header hdr; | |
425 | ||
426 | init_completion(&vmbus_connection.unload_event); | |
427 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
428 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
429 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header)); | |
430 | ||
431 | wait_for_completion(&vmbus_connection.unload_event); | |
432 | } | |
433 | ||
3e189519 | 434 | /* |
e98cb276 | 435 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 436 | * |
bd60c33e | 437 | */ |
e98cb276 | 438 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 439 | { |
bd60c33e | 440 | struct vmbus_channel_offer_channel *offer; |
188963ec | 441 | struct vmbus_channel *newchannel; |
3e7ee490 | 442 | |
bd60c33e | 443 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 444 | |
454f18a9 | 445 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 446 | newchannel = alloc_channel(); |
188963ec | 447 | if (!newchannel) { |
0a46618d | 448 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
449 | return; |
450 | } | |
451 | ||
132368bd S |
452 | /* |
453 | * By default we setup state to enable batched | |
454 | * reading. A specific service can choose to | |
455 | * disable this prior to opening the channel. | |
456 | */ | |
457 | newchannel->batched_reading = true; | |
458 | ||
b3bf60c7 S |
459 | /* |
460 | * Setup state for signalling the host. | |
461 | */ | |
462 | newchannel->sig_event = (struct hv_input_signal_event *) | |
463 | (ALIGN((unsigned long) | |
464 | &newchannel->sig_buf, | |
465 | HV_HYPERCALL_PARAM_ALIGN)); | |
466 | ||
467 | newchannel->sig_event->connectionid.asu32 = 0; | |
468 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
469 | newchannel->sig_event->flag_number = 0; | |
470 | newchannel->sig_event->rsvdz = 0; | |
471 | ||
472 | if (vmbus_proto_version != VERSION_WS2008) { | |
473 | newchannel->is_dedicated_interrupt = | |
474 | (offer->is_dedicated_interrupt != 0); | |
475 | newchannel->sig_event->connectionid.u.id = | |
476 | offer->connection_id; | |
477 | } | |
478 | ||
d3ba720d | 479 | init_vp_index(newchannel, &offer->offer.if_type); |
abbf3b2a | 480 | |
c50f7fb2 | 481 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 482 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
483 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
484 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 485 | |
2dd37cb8 | 486 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
487 | } |
488 | ||
3e189519 | 489 | /* |
e98cb276 | 490 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
491 | * |
492 | * We queue a work item to process this offer synchronously | |
493 | */ | |
e98cb276 | 494 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 495 | { |
bd60c33e | 496 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 497 | struct vmbus_channel *channel; |
d43e2fe7 DC |
498 | unsigned long flags; |
499 | struct device *dev; | |
3e7ee490 | 500 | |
bd60c33e | 501 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
d43e2fe7 | 502 | channel = relid2channel(rescind->child_relid); |
98e08702 | 503 | |
2dd37cb8 S |
504 | if (channel == NULL) { |
505 | hv_process_channel_removal(NULL, rescind->child_relid); | |
3e7ee490 | 506 | return; |
2dd37cb8 | 507 | } |
3e7ee490 | 508 | |
d43e2fe7 DC |
509 | spin_lock_irqsave(&channel->lock, flags); |
510 | channel->rescind = true; | |
511 | spin_unlock_irqrestore(&channel->lock, flags); | |
512 | ||
513 | if (channel->device_obj) { | |
514 | /* | |
515 | * We will have to unregister this device from the | |
516 | * driver core. | |
517 | */ | |
518 | dev = get_device(&channel->device_obj->device); | |
519 | if (dev) { | |
520 | vmbus_device_unregister(channel->device_obj); | |
521 | put_device(dev); | |
522 | } | |
523 | } else { | |
524 | hv_process_channel_removal(channel, | |
525 | channel->offermsg.child_relid); | |
2dd37cb8 | 526 | } |
3e7ee490 HJ |
527 | } |
528 | ||
3e189519 | 529 | /* |
e98cb276 HZ |
530 | * vmbus_onoffers_delivered - |
531 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
532 | * |
533 | * Nothing to do here. | |
534 | */ | |
e98cb276 | 535 | static void vmbus_onoffers_delivered( |
bd60c33e | 536 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 537 | { |
3e7ee490 HJ |
538 | } |
539 | ||
3e189519 | 540 | /* |
e98cb276 | 541 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
542 | * |
543 | * This is invoked when we received a response to our channel open request. | |
544 | * Find the matching request, copy the response and signal the requesting | |
545 | * thread. | |
546 | */ | |
e98cb276 | 547 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 548 | { |
bd60c33e | 549 | struct vmbus_channel_open_result *result; |
188963ec HZ |
550 | struct vmbus_channel_msginfo *msginfo; |
551 | struct vmbus_channel_message_header *requestheader; | |
552 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 553 | unsigned long flags; |
3e7ee490 | 554 | |
bd60c33e | 555 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 556 | |
bd60c33e GKH |
557 | /* |
558 | * Find the open msg, copy the result and signal/unblock the wait event | |
559 | */ | |
15b2f647 | 560 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 561 | |
ebb61e5f HJ |
562 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
563 | msglistentry) { | |
188963ec | 564 | requestheader = |
c50f7fb2 | 565 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 566 | |
c50f7fb2 | 567 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 568 | openmsg = |
c50f7fb2 HZ |
569 | (struct vmbus_channel_open_channel *)msginfo->msg; |
570 | if (openmsg->child_relid == result->child_relid && | |
571 | openmsg->openid == result->openid) { | |
572 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 573 | result, |
9568a193 S |
574 | sizeof( |
575 | struct vmbus_channel_open_result)); | |
576 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
577 | break; |
578 | } | |
579 | } | |
580 | } | |
15b2f647 | 581 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
582 | } |
583 | ||
3e189519 | 584 | /* |
e98cb276 | 585 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
586 | * |
587 | * This is invoked when we received a response to our gpadl create request. | |
588 | * Find the matching request, copy the response and signal the requesting | |
589 | * thread. | |
590 | */ | |
e98cb276 | 591 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 592 | { |
188963ec | 593 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
594 | struct vmbus_channel_msginfo *msginfo; |
595 | struct vmbus_channel_message_header *requestheader; | |
596 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 597 | unsigned long flags; |
3e7ee490 | 598 | |
188963ec | 599 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 600 | |
bd60c33e GKH |
601 | /* |
602 | * Find the establish msg, copy the result and signal/unblock the wait | |
603 | * event | |
604 | */ | |
15b2f647 | 605 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 606 | |
ebb61e5f HJ |
607 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
608 | msglistentry) { | |
188963ec | 609 | requestheader = |
c50f7fb2 | 610 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 611 | |
c50f7fb2 | 612 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
613 | gpadlheader = |
614 | (struct vmbus_channel_gpadl_header *)requestheader; | |
615 | ||
c50f7fb2 HZ |
616 | if ((gpadlcreated->child_relid == |
617 | gpadlheader->child_relid) && | |
618 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
619 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 620 | gpadlcreated, |
9568a193 S |
621 | sizeof( |
622 | struct vmbus_channel_gpadl_created)); | |
623 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
624 | break; |
625 | } | |
626 | } | |
627 | } | |
15b2f647 | 628 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
629 | } |
630 | ||
3e189519 | 631 | /* |
e98cb276 | 632 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
633 | * |
634 | * This is invoked when we received a response to our gpadl teardown request. | |
635 | * Find the matching request, copy the response and signal the requesting | |
636 | * thread. | |
637 | */ | |
e98cb276 | 638 | static void vmbus_ongpadl_torndown( |
bd60c33e | 639 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 640 | { |
188963ec | 641 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
642 | struct vmbus_channel_msginfo *msginfo; |
643 | struct vmbus_channel_message_header *requestheader; | |
644 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 645 | unsigned long flags; |
3e7ee490 | 646 | |
188963ec | 647 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
648 | |
649 | /* | |
650 | * Find the open msg, copy the result and signal/unblock the wait event | |
651 | */ | |
15b2f647 | 652 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 653 | |
ebb61e5f HJ |
654 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
655 | msglistentry) { | |
188963ec | 656 | requestheader = |
c50f7fb2 | 657 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 658 | |
c50f7fb2 | 659 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
660 | gpadl_teardown = |
661 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 662 | |
c50f7fb2 HZ |
663 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
664 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 665 | gpadl_torndown, |
9568a193 S |
666 | sizeof( |
667 | struct vmbus_channel_gpadl_torndown)); | |
668 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
669 | break; |
670 | } | |
671 | } | |
672 | } | |
15b2f647 | 673 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
674 | } |
675 | ||
3e189519 | 676 | /* |
e98cb276 | 677 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
678 | * |
679 | * This is invoked when we received a response to our initiate contact request. | |
680 | * Find the matching request, copy the response and signal the requesting | |
681 | * thread. | |
682 | */ | |
e98cb276 | 683 | static void vmbus_onversion_response( |
bd60c33e | 684 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 685 | { |
188963ec HZ |
686 | struct vmbus_channel_msginfo *msginfo; |
687 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 688 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 689 | unsigned long flags; |
3e7ee490 | 690 | |
188963ec | 691 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 692 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 693 | |
ebb61e5f HJ |
694 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
695 | msglistentry) { | |
188963ec | 696 | requestheader = |
c50f7fb2 | 697 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 698 | |
c50f7fb2 HZ |
699 | if (requestheader->msgtype == |
700 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 701 | memcpy(&msginfo->response.version_response, |
188963ec | 702 | version_response, |
bd60c33e | 703 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 704 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
705 | } |
706 | } | |
15b2f647 | 707 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
708 | } |
709 | ||
c8212f04 | 710 | /* Channel message dispatch table */ |
652594c7 | 711 | struct vmbus_channel_message_table_entry |
b7c6b02f | 712 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
713 | {CHANNELMSG_INVALID, 0, NULL}, |
714 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
715 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
716 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
717 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
718 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
719 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
720 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
721 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
722 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
723 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
724 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
725 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
726 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
727 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
728 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
729 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
2db84eff | 730 | {CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response}, |
c8212f04 GKH |
731 | }; |
732 | ||
3e189519 | 733 | /* |
e98cb276 | 734 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
735 | * |
736 | * This is invoked in the vmbus worker thread context. | |
737 | */ | |
e98cb276 | 738 | void vmbus_onmessage(void *context) |
3e7ee490 | 739 | { |
188963ec | 740 | struct hv_message *msg = context; |
82250213 | 741 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
742 | int size; |
743 | ||
f6feebe0 HZ |
744 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
745 | size = msg->header.payload_size; | |
3e7ee490 | 746 | |
c50f7fb2 | 747 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 748 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 749 | hdr->msgtype, size); |
04f50c4d | 750 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 751 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
752 | return; |
753 | } | |
754 | ||
b7c6b02f S |
755 | if (channel_message_table[hdr->msgtype].message_handler) |
756 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 757 | else |
0a46618d | 758 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
759 | } |
760 | ||
3e189519 | 761 | /* |
e98cb276 | 762 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 763 | */ |
e98cb276 | 764 | int vmbus_request_offers(void) |
3e7ee490 | 765 | { |
82250213 | 766 | struct vmbus_channel_message_header *msg; |
188963ec | 767 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 768 | int ret; |
3e7ee490 | 769 | |
188963ec | 770 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
771 | sizeof(struct vmbus_channel_message_header), |
772 | GFP_KERNEL); | |
188963ec | 773 | if (!msginfo) |
75910f23 | 774 | return -ENOMEM; |
3e7ee490 | 775 | |
c50f7fb2 | 776 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 777 | |
c50f7fb2 | 778 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 779 | |
3e7ee490 | 780 | |
c6977677 | 781 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
782 | sizeof(struct vmbus_channel_message_header)); |
783 | if (ret != 0) { | |
0a46618d | 784 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 785 | |
0c3b7b2f S |
786 | goto cleanup; |
787 | } | |
3e7ee490 | 788 | |
0c3b7b2f | 789 | cleanup: |
dd9b15dc | 790 | kfree(msginfo); |
3e7ee490 | 791 | |
3e7ee490 HJ |
792 | return ret; |
793 | } | |
794 | ||
e68d2971 S |
795 | /* |
796 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
797 | * When a primary channel has multiple sub-channels, we try to |
798 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
799 | */ |
800 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
801 | { | |
802 | struct list_head *cur, *tmp; | |
87712bf8 | 803 | int cur_cpu; |
e68d2971 S |
804 | struct vmbus_channel *cur_channel; |
805 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
806 | int next_channel; |
807 | int i = 1; | |
e68d2971 S |
808 | |
809 | if (list_empty(&primary->sc_list)) | |
810 | return outgoing_channel; | |
811 | ||
a13e8bbe S |
812 | next_channel = primary->next_oc++; |
813 | ||
814 | if (next_channel > (primary->num_sc)) { | |
815 | primary->next_oc = 0; | |
816 | return outgoing_channel; | |
817 | } | |
818 | ||
87712bf8 S |
819 | cur_cpu = hv_context.vp_index[get_cpu()]; |
820 | put_cpu(); | |
e68d2971 S |
821 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
822 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
823 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
824 | continue; | |
825 | ||
826 | if (cur_channel->target_vp == cur_cpu) | |
827 | return cur_channel; | |
828 | ||
a13e8bbe S |
829 | if (i == next_channel) |
830 | return cur_channel; | |
e68d2971 | 831 | |
a13e8bbe | 832 | i++; |
e68d2971 S |
833 | } |
834 | ||
835 | return outgoing_channel; | |
836 | } | |
837 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
838 | ||
839 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
840 | { | |
841 | struct list_head *cur, *tmp; | |
842 | struct vmbus_channel *cur_channel; | |
843 | ||
844 | if (primary_channel->sc_creation_callback == NULL) | |
845 | return; | |
846 | ||
847 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
848 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
849 | ||
850 | primary_channel->sc_creation_callback(cur_channel); | |
851 | } | |
852 | } | |
853 | ||
854 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
855 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
856 | { | |
857 | primary_channel->sc_creation_callback = sc_cr_cb; | |
858 | } | |
859 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
860 | ||
861 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
862 | { | |
863 | bool ret; | |
864 | ||
865 | ret = !list_empty(&primary->sc_list); | |
866 | ||
867 | if (ret) { | |
868 | /* | |
869 | * Invoke the callback on sub-channel creation. | |
870 | * This will present a uniform interface to the | |
871 | * clients. | |
872 | */ | |
873 | invoke_sc_cb(primary); | |
874 | } | |
875 | ||
876 | return ret; | |
877 | } | |
878 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |