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 | |
f38e7dd7 VK |
35 | static void init_vp_index(struct vmbus_channel *channel, |
36 | const uuid_le *type_guid); | |
37 | ||
c88c4e4c | 38 | /** |
da0e9631 | 39 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
40 | * @icmsghdrp: Pointer to msg header structure |
41 | * @icmsg_negotiate: Pointer to negotiate message structure | |
42 | * @buf: Raw buffer channel data | |
43 | * | |
44 | * @icmsghdrp is of type &struct icmsg_hdr. | |
45 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
46 | * Set up and fill in default negotiate response message. |
47 | * | |
6741335b S |
48 | * The fw_version specifies the framework version that |
49 | * we can support and srv_version specifies the service | |
50 | * version we can support. | |
c88c4e4c HJ |
51 | * |
52 | * Mainly used by Hyper-V drivers. | |
53 | */ | |
6741335b | 54 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 55 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 56 | int fw_version, int srv_version) |
c88c4e4c | 57 | { |
6741335b S |
58 | int icframe_major, icframe_minor; |
59 | int icmsg_major, icmsg_minor; | |
60 | int fw_major, fw_minor; | |
61 | int srv_major, srv_minor; | |
c836d0ab | 62 | int i; |
6741335b | 63 | bool found_match = false; |
c836d0ab | 64 | |
a3605300 | 65 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
66 | fw_major = (fw_version >> 16); |
67 | fw_minor = (fw_version & 0xFFFF); | |
68 | ||
69 | srv_major = (srv_version >> 16); | |
70 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 71 | |
a3605300 S |
72 | negop = (struct icmsg_negotiate *)&buf[ |
73 | sizeof(struct vmbuspipe_hdr) + | |
74 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 75 | |
6741335b S |
76 | icframe_major = negop->icframe_vercnt; |
77 | icframe_minor = 0; | |
78 | ||
79 | icmsg_major = negop->icmsg_vercnt; | |
80 | icmsg_minor = 0; | |
c836d0ab S |
81 | |
82 | /* | |
83 | * Select the framework version number we will | |
84 | * support. | |
85 | */ | |
86 | ||
87 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
88 | if ((negop->icversion_data[i].major == fw_major) && |
89 | (negop->icversion_data[i].minor == fw_minor)) { | |
90 | icframe_major = negop->icversion_data[i].major; | |
91 | icframe_minor = negop->icversion_data[i].minor; | |
92 | found_match = true; | |
93 | } | |
c836d0ab S |
94 | } |
95 | ||
6741335b S |
96 | if (!found_match) |
97 | goto fw_error; | |
98 | ||
99 | found_match = false; | |
100 | ||
c836d0ab S |
101 | for (i = negop->icframe_vercnt; |
102 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
103 | if ((negop->icversion_data[i].major == srv_major) && |
104 | (negop->icversion_data[i].minor == srv_minor)) { | |
105 | icmsg_major = negop->icversion_data[i].major; | |
106 | icmsg_minor = negop->icversion_data[i].minor; | |
107 | found_match = true; | |
108 | } | |
c88c4e4c | 109 | } |
a3605300 | 110 | |
c836d0ab | 111 | /* |
6741335b | 112 | * Respond with the framework and service |
c836d0ab S |
113 | * version numbers we can support. |
114 | */ | |
6741335b S |
115 | |
116 | fw_error: | |
117 | if (!found_match) { | |
118 | negop->icframe_vercnt = 0; | |
119 | negop->icmsg_vercnt = 0; | |
120 | } else { | |
121 | negop->icframe_vercnt = 1; | |
122 | negop->icmsg_vercnt = 1; | |
123 | } | |
124 | ||
125 | negop->icversion_data[0].major = icframe_major; | |
126 | negop->icversion_data[0].minor = icframe_minor; | |
127 | negop->icversion_data[1].major = icmsg_major; | |
128 | negop->icversion_data[1].minor = icmsg_minor; | |
129 | return found_match; | |
c88c4e4c | 130 | } |
a3605300 | 131 | |
da0e9631 | 132 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 133 | |
3e189519 | 134 | /* |
e98cb276 | 135 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 136 | */ |
50fe56d2 | 137 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 138 | { |
bc63b6f6 | 139 | static atomic_t chan_num = ATOMIC_INIT(0); |
aded7165 | 140 | struct vmbus_channel *channel; |
3e7ee490 | 141 | |
aded7165 | 142 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 143 | if (!channel) |
3e7ee490 | 144 | return NULL; |
3e7ee490 | 145 | |
bc63b6f6 | 146 | channel->id = atomic_inc_return(&chan_num); |
54411c42 | 147 | spin_lock_init(&channel->inbound_lock); |
67fae053 | 148 | spin_lock_init(&channel->lock); |
e68d2971 S |
149 | |
150 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 151 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 152 | |
3e7ee490 HJ |
153 | return channel; |
154 | } | |
155 | ||
3e189519 | 156 | /* |
e98cb276 | 157 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 158 | */ |
9f3e28e3 | 159 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 160 | { |
aadc3780 | 161 | kfree(channel); |
3e7ee490 HJ |
162 | } |
163 | ||
3a28fa35 S |
164 | static void percpu_channel_enq(void *arg) |
165 | { | |
166 | struct vmbus_channel *channel = arg; | |
167 | int cpu = smp_processor_id(); | |
168 | ||
169 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
170 | } | |
8b5d6d3b | 171 | |
3a28fa35 S |
172 | static void percpu_channel_deq(void *arg) |
173 | { | |
174 | struct vmbus_channel *channel = arg; | |
175 | ||
176 | list_del(&channel->percpu_list); | |
177 | } | |
8b5d6d3b | 178 | |
ed6cfcc5 S |
179 | |
180 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) | |
4b2f9abe | 181 | { |
ed6cfcc5 | 182 | struct vmbus_channel_relid_released msg; |
c8705979 | 183 | unsigned long flags; |
e68d2971 | 184 | struct vmbus_channel *primary_channel; |
4b2f9abe | 185 | |
c8705979 | 186 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 187 | msg.child_relid = relid; |
c8705979 S |
188 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
189 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
190 | ||
ed6cfcc5 S |
191 | if (channel == NULL) |
192 | return; | |
193 | ||
2115b561 S |
194 | if (channel->target_cpu != get_cpu()) { |
195 | put_cpu(); | |
3a28fa35 S |
196 | smp_call_function_single(channel->target_cpu, |
197 | percpu_channel_deq, channel, true); | |
2115b561 | 198 | } else { |
3a28fa35 | 199 | percpu_channel_deq(channel); |
2115b561 S |
200 | put_cpu(); |
201 | } | |
3a28fa35 | 202 | |
e68d2971 S |
203 | if (channel->primary_channel == NULL) { |
204 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
205 | list_del(&channel->listentry); | |
206 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
207 | } else { | |
208 | primary_channel = channel->primary_channel; | |
67fae053 | 209 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 210 | list_del(&channel->sc_list); |
357e836a | 211 | primary_channel->num_sc--; |
67fae053 | 212 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 213 | } |
c8705979 | 214 | free_channel(channel); |
4b2f9abe | 215 | } |
8b5d6d3b | 216 | |
93e5bd06 S |
217 | void vmbus_free_channels(void) |
218 | { | |
813c5b79 DC |
219 | struct vmbus_channel *channel, *tmp; |
220 | ||
221 | list_for_each_entry_safe(channel, tmp, &vmbus_connection.chn_list, | |
222 | listentry) { | |
223 | /* if we don't set rescind to true, vmbus_close_internal() | |
224 | * won't invoke hv_process_channel_removal(). | |
225 | */ | |
226 | channel->rescind = true; | |
93e5bd06 | 227 | |
93e5bd06 | 228 | vmbus_device_unregister(channel->device_obj); |
93e5bd06 S |
229 | } |
230 | } | |
231 | ||
3e189519 | 232 | /* |
e98cb276 | 233 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 234 | * associated with this offer |
bd60c33e | 235 | */ |
2dd37cb8 | 236 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 237 | { |
aded7165 | 238 | struct vmbus_channel *channel; |
188963ec | 239 | bool fnew = true; |
0f5e44ca | 240 | unsigned long flags; |
3e7ee490 | 241 | |
454f18a9 | 242 | /* Make sure this is a new offer */ |
15b2f647 | 243 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 244 | |
da9fcb72 | 245 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
246 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
247 | newchannel->offermsg.offer.if_type) && | |
248 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
249 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 250 | fnew = false; |
3e7ee490 HJ |
251 | break; |
252 | } | |
253 | } | |
254 | ||
8dfd3326 | 255 | if (fnew) |
c50f7fb2 | 256 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 257 | &vmbus_connection.chn_list); |
bd60c33e | 258 | |
15b2f647 | 259 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 260 | |
188963ec | 261 | if (!fnew) { |
e68d2971 S |
262 | /* |
263 | * Check to see if this is a sub-channel. | |
264 | */ | |
265 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
266 | /* | |
267 | * Process the sub-channel. | |
268 | */ | |
269 | newchannel->primary_channel = channel; | |
67fae053 | 270 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 271 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
a13e8bbe | 272 | channel->num_sc++; |
357e836a | 273 | spin_unlock_irqrestore(&channel->lock, flags); |
8dfd3326 VK |
274 | } else |
275 | goto err_free_chan; | |
276 | } | |
e68d2971 | 277 | |
f38e7dd7 VK |
278 | init_vp_index(newchannel, &newchannel->offermsg.offer.if_type); |
279 | ||
8dfd3326 VK |
280 | if (newchannel->target_cpu != get_cpu()) { |
281 | put_cpu(); | |
282 | smp_call_function_single(newchannel->target_cpu, | |
283 | percpu_channel_enq, | |
284 | newchannel, true); | |
285 | } else { | |
286 | percpu_channel_enq(newchannel); | |
287 | put_cpu(); | |
3e7ee490 HJ |
288 | } |
289 | ||
42dceebe S |
290 | /* |
291 | * This state is used to indicate a successful open | |
292 | * so that when we do close the channel normally, we | |
293 | * can cleanup properly | |
294 | */ | |
295 | newchannel->state = CHANNEL_OPEN_STATE; | |
296 | ||
8dfd3326 VK |
297 | if (!fnew) { |
298 | if (channel->sc_creation_callback != NULL) | |
299 | channel->sc_creation_callback(newchannel); | |
300 | return; | |
301 | } | |
302 | ||
bd60c33e GKH |
303 | /* |
304 | * Start the process of binding this offer to the driver | |
305 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 306 | * vmbus_child_dev_add() |
bd60c33e | 307 | */ |
f2c73011 | 308 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
309 | &newchannel->offermsg.offer.if_type, |
310 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 311 | newchannel); |
9c3a6f7e | 312 | if (!newchannel->device_obj) |
5b1e5b53 | 313 | goto err_deq_chan; |
3e7ee490 | 314 | |
454f18a9 BP |
315 | /* |
316 | * Add the new device to the bus. This will kick off device-driver | |
317 | * binding which eventually invokes the device driver's AddDevice() | |
318 | * method. | |
319 | */ | |
d43e2fe7 DC |
320 | if (vmbus_device_register(newchannel->device_obj) != 0) { |
321 | pr_err("unable to add child device object (relid %d)\n", | |
322 | newchannel->offermsg.child_relid); | |
323 | kfree(newchannel->device_obj); | |
324 | goto err_deq_chan; | |
325 | } | |
9c3a6f7e | 326 | return; |
2dd37cb8 | 327 | |
5b1e5b53 S |
328 | err_deq_chan: |
329 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
330 | list_del(&newchannel->listentry); | |
331 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
332 | ||
333 | if (newchannel->target_cpu != get_cpu()) { | |
334 | put_cpu(); | |
335 | smp_call_function_single(newchannel->target_cpu, | |
336 | percpu_channel_deq, newchannel, true); | |
337 | } else { | |
338 | percpu_channel_deq(newchannel); | |
339 | put_cpu(); | |
340 | } | |
341 | ||
9c3a6f7e VK |
342 | err_free_chan: |
343 | free_channel(newchannel); | |
3e7ee490 HJ |
344 | } |
345 | ||
a119845f S |
346 | enum { |
347 | IDE = 0, | |
348 | SCSI, | |
349 | NIC, | |
350 | MAX_PERF_CHN, | |
351 | }; | |
352 | ||
353 | /* | |
7fb96565 | 354 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
355 | * We attempt to distribute the interrupt load for these devices across |
356 | * all available CPUs. | |
357 | */ | |
7fb96565 | 358 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 359 | /* IDE */ |
7fb96565 | 360 | { HV_IDE_GUID, }, |
a119845f | 361 | /* Storage - SCSI */ |
7fb96565 | 362 | { HV_SCSI_GUID, }, |
a119845f | 363 | /* Network */ |
7fb96565 | 364 | { HV_NIC_GUID, }, |
04653a00 S |
365 | /* NetworkDirect Guest RDMA */ |
366 | { HV_ND_GUID, }, | |
a119845f S |
367 | }; |
368 | ||
369 | ||
370 | /* | |
371 | * We use this state to statically distribute the channel interrupt load. | |
372 | */ | |
373 | static u32 next_vp; | |
374 | ||
375 | /* | |
376 | * Starting with Win8, we can statically distribute the incoming | |
377 | * channel interrupt load by binding a channel to VCPU. We | |
378 | * implement here a simple round robin scheme for distributing | |
379 | * the interrupt load. | |
380 | * We will bind channels that are not performance critical to cpu 0 and | |
381 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
382 | * distributed across all available CPUs. | |
383 | */ | |
f9da455b | 384 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
385 | { |
386 | u32 cur_cpu; | |
387 | int i; | |
388 | bool perf_chn = false; | |
389 | u32 max_cpus = num_online_cpus(); | |
390 | ||
391 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 392 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
393 | sizeof(uuid_le))) { |
394 | perf_chn = true; | |
395 | break; | |
396 | } | |
397 | } | |
398 | if ((vmbus_proto_version == VERSION_WS2008) || | |
399 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
400 | /* | |
401 | * Prior to win8, all channel interrupts are | |
402 | * delivered on cpu 0. | |
403 | * Also if the channel is not a performance critical | |
404 | * channel, bind it to cpu 0. | |
405 | */ | |
d3ba720d S |
406 | channel->target_cpu = 0; |
407 | channel->target_vp = 0; | |
408 | return; | |
a119845f S |
409 | } |
410 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
411 | channel->target_cpu = cur_cpu; |
412 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
413 | } |
414 | ||
2db84eff S |
415 | /* |
416 | * vmbus_unload_response - Handler for the unload response. | |
417 | */ | |
418 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
419 | { | |
420 | /* | |
421 | * This is a global event; just wakeup the waiting thread. | |
422 | * Once we successfully unload, we can cleanup the monitor state. | |
423 | */ | |
424 | complete(&vmbus_connection.unload_event); | |
425 | } | |
426 | ||
427 | void vmbus_initiate_unload(void) | |
428 | { | |
429 | struct vmbus_channel_message_header hdr; | |
430 | ||
431 | init_completion(&vmbus_connection.unload_event); | |
432 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
433 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
434 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header)); | |
435 | ||
436 | wait_for_completion(&vmbus_connection.unload_event); | |
437 | } | |
438 | ||
3e189519 | 439 | /* |
e98cb276 | 440 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 441 | * |
bd60c33e | 442 | */ |
e98cb276 | 443 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 444 | { |
bd60c33e | 445 | struct vmbus_channel_offer_channel *offer; |
188963ec | 446 | struct vmbus_channel *newchannel; |
3e7ee490 | 447 | |
bd60c33e | 448 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 449 | |
454f18a9 | 450 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 451 | newchannel = alloc_channel(); |
188963ec | 452 | if (!newchannel) { |
0a46618d | 453 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
454 | return; |
455 | } | |
456 | ||
132368bd S |
457 | /* |
458 | * By default we setup state to enable batched | |
459 | * reading. A specific service can choose to | |
460 | * disable this prior to opening the channel. | |
461 | */ | |
462 | newchannel->batched_reading = true; | |
463 | ||
b3bf60c7 S |
464 | /* |
465 | * Setup state for signalling the host. | |
466 | */ | |
467 | newchannel->sig_event = (struct hv_input_signal_event *) | |
468 | (ALIGN((unsigned long) | |
469 | &newchannel->sig_buf, | |
470 | HV_HYPERCALL_PARAM_ALIGN)); | |
471 | ||
472 | newchannel->sig_event->connectionid.asu32 = 0; | |
473 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
474 | newchannel->sig_event->flag_number = 0; | |
475 | newchannel->sig_event->rsvdz = 0; | |
476 | ||
477 | if (vmbus_proto_version != VERSION_WS2008) { | |
478 | newchannel->is_dedicated_interrupt = | |
479 | (offer->is_dedicated_interrupt != 0); | |
480 | newchannel->sig_event->connectionid.u.id = | |
481 | offer->connection_id; | |
482 | } | |
483 | ||
c50f7fb2 | 484 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 485 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
486 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
487 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 488 | |
2dd37cb8 | 489 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
490 | } |
491 | ||
3e189519 | 492 | /* |
e98cb276 | 493 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
494 | * |
495 | * We queue a work item to process this offer synchronously | |
496 | */ | |
e98cb276 | 497 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 498 | { |
bd60c33e | 499 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 500 | struct vmbus_channel *channel; |
d43e2fe7 DC |
501 | unsigned long flags; |
502 | struct device *dev; | |
3e7ee490 | 503 | |
bd60c33e | 504 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
d43e2fe7 | 505 | channel = relid2channel(rescind->child_relid); |
98e08702 | 506 | |
2dd37cb8 S |
507 | if (channel == NULL) { |
508 | hv_process_channel_removal(NULL, rescind->child_relid); | |
3e7ee490 | 509 | return; |
2dd37cb8 | 510 | } |
3e7ee490 | 511 | |
d43e2fe7 DC |
512 | spin_lock_irqsave(&channel->lock, flags); |
513 | channel->rescind = true; | |
514 | spin_unlock_irqrestore(&channel->lock, flags); | |
515 | ||
516 | if (channel->device_obj) { | |
517 | /* | |
518 | * We will have to unregister this device from the | |
519 | * driver core. | |
520 | */ | |
521 | dev = get_device(&channel->device_obj->device); | |
522 | if (dev) { | |
523 | vmbus_device_unregister(channel->device_obj); | |
524 | put_device(dev); | |
525 | } | |
526 | } else { | |
527 | hv_process_channel_removal(channel, | |
528 | channel->offermsg.child_relid); | |
2dd37cb8 | 529 | } |
3e7ee490 HJ |
530 | } |
531 | ||
3e189519 | 532 | /* |
e98cb276 HZ |
533 | * vmbus_onoffers_delivered - |
534 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
535 | * |
536 | * Nothing to do here. | |
537 | */ | |
e98cb276 | 538 | static void vmbus_onoffers_delivered( |
bd60c33e | 539 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 540 | { |
3e7ee490 HJ |
541 | } |
542 | ||
3e189519 | 543 | /* |
e98cb276 | 544 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
545 | * |
546 | * This is invoked when we received a response to our channel open request. | |
547 | * Find the matching request, copy the response and signal the requesting | |
548 | * thread. | |
549 | */ | |
e98cb276 | 550 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 551 | { |
bd60c33e | 552 | struct vmbus_channel_open_result *result; |
188963ec HZ |
553 | struct vmbus_channel_msginfo *msginfo; |
554 | struct vmbus_channel_message_header *requestheader; | |
555 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 556 | unsigned long flags; |
3e7ee490 | 557 | |
bd60c33e | 558 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 559 | |
bd60c33e GKH |
560 | /* |
561 | * Find the open msg, copy the result and signal/unblock the wait event | |
562 | */ | |
15b2f647 | 563 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 564 | |
ebb61e5f HJ |
565 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
566 | msglistentry) { | |
188963ec | 567 | requestheader = |
c50f7fb2 | 568 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 569 | |
c50f7fb2 | 570 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 571 | openmsg = |
c50f7fb2 HZ |
572 | (struct vmbus_channel_open_channel *)msginfo->msg; |
573 | if (openmsg->child_relid == result->child_relid && | |
574 | openmsg->openid == result->openid) { | |
575 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 576 | result, |
9568a193 S |
577 | sizeof( |
578 | struct vmbus_channel_open_result)); | |
579 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
580 | break; |
581 | } | |
582 | } | |
583 | } | |
15b2f647 | 584 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
585 | } |
586 | ||
3e189519 | 587 | /* |
e98cb276 | 588 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
589 | * |
590 | * This is invoked when we received a response to our gpadl create request. | |
591 | * Find the matching request, copy the response and signal the requesting | |
592 | * thread. | |
593 | */ | |
e98cb276 | 594 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 595 | { |
188963ec | 596 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
597 | struct vmbus_channel_msginfo *msginfo; |
598 | struct vmbus_channel_message_header *requestheader; | |
599 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 600 | unsigned long flags; |
3e7ee490 | 601 | |
188963ec | 602 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 603 | |
bd60c33e GKH |
604 | /* |
605 | * Find the establish msg, copy the result and signal/unblock the wait | |
606 | * event | |
607 | */ | |
15b2f647 | 608 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 609 | |
ebb61e5f HJ |
610 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
611 | msglistentry) { | |
188963ec | 612 | requestheader = |
c50f7fb2 | 613 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 614 | |
c50f7fb2 | 615 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
616 | gpadlheader = |
617 | (struct vmbus_channel_gpadl_header *)requestheader; | |
618 | ||
c50f7fb2 HZ |
619 | if ((gpadlcreated->child_relid == |
620 | gpadlheader->child_relid) && | |
621 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
622 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 623 | gpadlcreated, |
9568a193 S |
624 | sizeof( |
625 | struct vmbus_channel_gpadl_created)); | |
626 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
627 | break; |
628 | } | |
629 | } | |
630 | } | |
15b2f647 | 631 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
632 | } |
633 | ||
3e189519 | 634 | /* |
e98cb276 | 635 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
636 | * |
637 | * This is invoked when we received a response to our gpadl teardown request. | |
638 | * Find the matching request, copy the response and signal the requesting | |
639 | * thread. | |
640 | */ | |
e98cb276 | 641 | static void vmbus_ongpadl_torndown( |
bd60c33e | 642 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 643 | { |
188963ec | 644 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
645 | struct vmbus_channel_msginfo *msginfo; |
646 | struct vmbus_channel_message_header *requestheader; | |
647 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 648 | unsigned long flags; |
3e7ee490 | 649 | |
188963ec | 650 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
651 | |
652 | /* | |
653 | * Find the open msg, copy the result and signal/unblock the wait event | |
654 | */ | |
15b2f647 | 655 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 656 | |
ebb61e5f HJ |
657 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
658 | msglistentry) { | |
188963ec | 659 | requestheader = |
c50f7fb2 | 660 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 661 | |
c50f7fb2 | 662 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
663 | gpadl_teardown = |
664 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 665 | |
c50f7fb2 HZ |
666 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
667 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 668 | gpadl_torndown, |
9568a193 S |
669 | sizeof( |
670 | struct vmbus_channel_gpadl_torndown)); | |
671 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
672 | break; |
673 | } | |
674 | } | |
675 | } | |
15b2f647 | 676 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
677 | } |
678 | ||
3e189519 | 679 | /* |
e98cb276 | 680 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
681 | * |
682 | * This is invoked when we received a response to our initiate contact request. | |
683 | * Find the matching request, copy the response and signal the requesting | |
684 | * thread. | |
685 | */ | |
e98cb276 | 686 | static void vmbus_onversion_response( |
bd60c33e | 687 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 688 | { |
188963ec HZ |
689 | struct vmbus_channel_msginfo *msginfo; |
690 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 691 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 692 | unsigned long flags; |
3e7ee490 | 693 | |
188963ec | 694 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 695 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 696 | |
ebb61e5f HJ |
697 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
698 | msglistentry) { | |
188963ec | 699 | requestheader = |
c50f7fb2 | 700 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 701 | |
c50f7fb2 HZ |
702 | if (requestheader->msgtype == |
703 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 704 | memcpy(&msginfo->response.version_response, |
188963ec | 705 | version_response, |
bd60c33e | 706 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 707 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
708 | } |
709 | } | |
15b2f647 | 710 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
711 | } |
712 | ||
c8212f04 | 713 | /* Channel message dispatch table */ |
652594c7 | 714 | struct vmbus_channel_message_table_entry |
b7c6b02f | 715 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
716 | {CHANNELMSG_INVALID, 0, NULL}, |
717 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
718 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
719 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
720 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
721 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
722 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
723 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
724 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
725 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
726 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
727 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
728 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
729 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
730 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
731 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
732 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
2db84eff | 733 | {CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response}, |
c8212f04 GKH |
734 | }; |
735 | ||
3e189519 | 736 | /* |
e98cb276 | 737 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
738 | * |
739 | * This is invoked in the vmbus worker thread context. | |
740 | */ | |
e98cb276 | 741 | void vmbus_onmessage(void *context) |
3e7ee490 | 742 | { |
188963ec | 743 | struct hv_message *msg = context; |
82250213 | 744 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
745 | int size; |
746 | ||
f6feebe0 HZ |
747 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
748 | size = msg->header.payload_size; | |
3e7ee490 | 749 | |
c50f7fb2 | 750 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 751 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 752 | hdr->msgtype, size); |
04f50c4d | 753 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 754 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
755 | return; |
756 | } | |
757 | ||
b7c6b02f S |
758 | if (channel_message_table[hdr->msgtype].message_handler) |
759 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 760 | else |
0a46618d | 761 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
762 | } |
763 | ||
3e189519 | 764 | /* |
e98cb276 | 765 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 766 | */ |
e98cb276 | 767 | int vmbus_request_offers(void) |
3e7ee490 | 768 | { |
82250213 | 769 | struct vmbus_channel_message_header *msg; |
188963ec | 770 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 771 | int ret; |
3e7ee490 | 772 | |
188963ec | 773 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
774 | sizeof(struct vmbus_channel_message_header), |
775 | GFP_KERNEL); | |
188963ec | 776 | if (!msginfo) |
75910f23 | 777 | return -ENOMEM; |
3e7ee490 | 778 | |
c50f7fb2 | 779 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 780 | |
c50f7fb2 | 781 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 782 | |
3e7ee490 | 783 | |
c6977677 | 784 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
785 | sizeof(struct vmbus_channel_message_header)); |
786 | if (ret != 0) { | |
0a46618d | 787 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 788 | |
0c3b7b2f S |
789 | goto cleanup; |
790 | } | |
3e7ee490 | 791 | |
0c3b7b2f | 792 | cleanup: |
dd9b15dc | 793 | kfree(msginfo); |
3e7ee490 | 794 | |
3e7ee490 HJ |
795 | return ret; |
796 | } | |
797 | ||
e68d2971 S |
798 | /* |
799 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
800 | * When a primary channel has multiple sub-channels, we try to |
801 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
802 | */ |
803 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
804 | { | |
805 | struct list_head *cur, *tmp; | |
87712bf8 | 806 | int cur_cpu; |
e68d2971 S |
807 | struct vmbus_channel *cur_channel; |
808 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
809 | int next_channel; |
810 | int i = 1; | |
e68d2971 S |
811 | |
812 | if (list_empty(&primary->sc_list)) | |
813 | return outgoing_channel; | |
814 | ||
a13e8bbe S |
815 | next_channel = primary->next_oc++; |
816 | ||
817 | if (next_channel > (primary->num_sc)) { | |
818 | primary->next_oc = 0; | |
819 | return outgoing_channel; | |
820 | } | |
821 | ||
87712bf8 S |
822 | cur_cpu = hv_context.vp_index[get_cpu()]; |
823 | put_cpu(); | |
e68d2971 S |
824 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
825 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
826 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
827 | continue; | |
828 | ||
829 | if (cur_channel->target_vp == cur_cpu) | |
830 | return cur_channel; | |
831 | ||
a13e8bbe S |
832 | if (i == next_channel) |
833 | return cur_channel; | |
e68d2971 | 834 | |
a13e8bbe | 835 | i++; |
e68d2971 S |
836 | } |
837 | ||
838 | return outgoing_channel; | |
839 | } | |
840 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
841 | ||
842 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
843 | { | |
844 | struct list_head *cur, *tmp; | |
845 | struct vmbus_channel *cur_channel; | |
846 | ||
847 | if (primary_channel->sc_creation_callback == NULL) | |
848 | return; | |
849 | ||
850 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
851 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
852 | ||
853 | primary_channel->sc_creation_callback(cur_channel); | |
854 | } | |
855 | } | |
856 | ||
857 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
858 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
859 | { | |
860 | primary_channel->sc_creation_callback = sc_cr_cb; | |
861 | } | |
862 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
863 | ||
864 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
865 | { | |
866 | bool ret; | |
867 | ||
868 | ret = !list_empty(&primary->sc_list); | |
869 | ||
870 | if (ret) { | |
871 | /* | |
872 | * Invoke the callback on sub-channel creation. | |
873 | * This will present a uniform interface to the | |
874 | * clients. | |
875 | */ | |
876 | invoke_sc_cb(primary); | |
877 | } | |
878 | ||
879 | return ret; | |
880 | } | |
881 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |