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