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 | |
1d7e907f | 35 | struct vmbus_channel_message_table_entry { |
cf9dcba7 | 36 | enum vmbus_channel_message_type message_type; |
fa90f1de | 37 | void (*message_handler)(struct vmbus_channel_message_header *msg); |
1d7e907f | 38 | }; |
3e7ee490 | 39 | |
c88c4e4c HJ |
40 | |
41 | /** | |
da0e9631 | 42 | * vmbus_prep_negotiate_resp() - Create default response for Hyper-V Negotiate message |
c88c4e4c HJ |
43 | * @icmsghdrp: Pointer to msg header structure |
44 | * @icmsg_negotiate: Pointer to negotiate message structure | |
45 | * @buf: Raw buffer channel data | |
46 | * | |
47 | * @icmsghdrp is of type &struct icmsg_hdr. | |
48 | * @negop is of type &struct icmsg_negotiate. | |
c836d0ab S |
49 | * Set up and fill in default negotiate response message. |
50 | * | |
6741335b S |
51 | * The fw_version specifies the framework version that |
52 | * we can support and srv_version specifies the service | |
53 | * version we can support. | |
c88c4e4c HJ |
54 | * |
55 | * Mainly used by Hyper-V drivers. | |
56 | */ | |
6741335b | 57 | bool vmbus_prep_negotiate_resp(struct icmsg_hdr *icmsghdrp, |
c836d0ab | 58 | struct icmsg_negotiate *negop, u8 *buf, |
6741335b | 59 | int fw_version, int srv_version) |
c88c4e4c | 60 | { |
6741335b S |
61 | int icframe_major, icframe_minor; |
62 | int icmsg_major, icmsg_minor; | |
63 | int fw_major, fw_minor; | |
64 | int srv_major, srv_minor; | |
c836d0ab | 65 | int i; |
6741335b | 66 | bool found_match = false; |
c836d0ab | 67 | |
a3605300 | 68 | icmsghdrp->icmsgsize = 0x10; |
6741335b S |
69 | fw_major = (fw_version >> 16); |
70 | fw_minor = (fw_version & 0xFFFF); | |
71 | ||
72 | srv_major = (srv_version >> 16); | |
73 | srv_minor = (srv_version & 0xFFFF); | |
c88c4e4c | 74 | |
a3605300 S |
75 | negop = (struct icmsg_negotiate *)&buf[ |
76 | sizeof(struct vmbuspipe_hdr) + | |
77 | sizeof(struct icmsg_hdr)]; | |
c88c4e4c | 78 | |
6741335b S |
79 | icframe_major = negop->icframe_vercnt; |
80 | icframe_minor = 0; | |
81 | ||
82 | icmsg_major = negop->icmsg_vercnt; | |
83 | icmsg_minor = 0; | |
c836d0ab S |
84 | |
85 | /* | |
86 | * Select the framework version number we will | |
87 | * support. | |
88 | */ | |
89 | ||
90 | for (i = 0; i < negop->icframe_vercnt; i++) { | |
6741335b S |
91 | if ((negop->icversion_data[i].major == fw_major) && |
92 | (negop->icversion_data[i].minor == fw_minor)) { | |
93 | icframe_major = negop->icversion_data[i].major; | |
94 | icframe_minor = negop->icversion_data[i].minor; | |
95 | found_match = true; | |
96 | } | |
c836d0ab S |
97 | } |
98 | ||
6741335b S |
99 | if (!found_match) |
100 | goto fw_error; | |
101 | ||
102 | found_match = false; | |
103 | ||
c836d0ab S |
104 | for (i = negop->icframe_vercnt; |
105 | (i < negop->icframe_vercnt + negop->icmsg_vercnt); i++) { | |
6741335b S |
106 | if ((negop->icversion_data[i].major == srv_major) && |
107 | (negop->icversion_data[i].minor == srv_minor)) { | |
108 | icmsg_major = negop->icversion_data[i].major; | |
109 | icmsg_minor = negop->icversion_data[i].minor; | |
110 | found_match = true; | |
111 | } | |
c88c4e4c | 112 | } |
a3605300 | 113 | |
c836d0ab | 114 | /* |
6741335b | 115 | * Respond with the framework and service |
c836d0ab S |
116 | * version numbers we can support. |
117 | */ | |
6741335b S |
118 | |
119 | fw_error: | |
120 | if (!found_match) { | |
121 | negop->icframe_vercnt = 0; | |
122 | negop->icmsg_vercnt = 0; | |
123 | } else { | |
124 | negop->icframe_vercnt = 1; | |
125 | negop->icmsg_vercnt = 1; | |
126 | } | |
127 | ||
128 | negop->icversion_data[0].major = icframe_major; | |
129 | negop->icversion_data[0].minor = icframe_minor; | |
130 | negop->icversion_data[1].major = icmsg_major; | |
131 | negop->icversion_data[1].minor = icmsg_minor; | |
132 | return found_match; | |
c88c4e4c | 133 | } |
a3605300 | 134 | |
da0e9631 | 135 | EXPORT_SYMBOL_GPL(vmbus_prep_negotiate_resp); |
c88c4e4c | 136 | |
2dd37cb8 S |
137 | static void vmbus_process_device_unregister(struct work_struct *work) |
138 | { | |
139 | struct device *dev; | |
140 | struct vmbus_channel *channel = container_of(work, | |
141 | struct vmbus_channel, | |
142 | work); | |
143 | ||
144 | dev = get_device(&channel->device_obj->device); | |
145 | if (dev) { | |
146 | vmbus_device_unregister(channel->device_obj); | |
147 | put_device(dev); | |
148 | } | |
149 | } | |
150 | ||
151 | static void vmbus_sc_creation_cb(struct work_struct *work) | |
152 | { | |
153 | struct vmbus_channel *newchannel = container_of(work, | |
154 | struct vmbus_channel, | |
155 | work); | |
156 | struct vmbus_channel *primary_channel = newchannel->primary_channel; | |
157 | ||
158 | /* | |
159 | * On entry sc_creation_callback has been already verified to | |
160 | * be non-NULL. | |
161 | */ | |
162 | primary_channel->sc_creation_callback(newchannel); | |
163 | } | |
164 | ||
3e189519 | 165 | /* |
e98cb276 | 166 | * alloc_channel - Allocate and initialize a vmbus channel object |
bd60c33e | 167 | */ |
50fe56d2 | 168 | static struct vmbus_channel *alloc_channel(void) |
3e7ee490 | 169 | { |
bc63b6f6 | 170 | static atomic_t chan_num = ATOMIC_INIT(0); |
aded7165 | 171 | struct vmbus_channel *channel; |
3e7ee490 | 172 | |
aded7165 | 173 | channel = kzalloc(sizeof(*channel), GFP_ATOMIC); |
3e7ee490 | 174 | if (!channel) |
3e7ee490 | 175 | return NULL; |
3e7ee490 | 176 | |
bc63b6f6 | 177 | channel->id = atomic_inc_return(&chan_num); |
54411c42 | 178 | spin_lock_init(&channel->inbound_lock); |
67fae053 | 179 | spin_lock_init(&channel->lock); |
e68d2971 S |
180 | |
181 | INIT_LIST_HEAD(&channel->sc_list); | |
3a28fa35 | 182 | INIT_LIST_HEAD(&channel->percpu_list); |
3e7ee490 | 183 | |
bc63b6f6 VK |
184 | channel->controlwq = alloc_workqueue("hv_vmbus_ctl/%d", WQ_MEM_RECLAIM, |
185 | 1, channel->id); | |
c50f7fb2 | 186 | if (!channel->controlwq) { |
8c69f52a | 187 | kfree(channel); |
3e7ee490 HJ |
188 | return NULL; |
189 | } | |
190 | ||
191 | return channel; | |
192 | } | |
193 | ||
3e189519 | 194 | /* |
e98cb276 | 195 | * release_hannel - Release the vmbus channel object itself |
bd60c33e | 196 | */ |
4b2f9abe | 197 | static void release_channel(struct work_struct *work) |
3e7ee490 | 198 | { |
4b2f9abe TT |
199 | struct vmbus_channel *channel = container_of(work, |
200 | struct vmbus_channel, | |
201 | work); | |
3e7ee490 | 202 | |
c50f7fb2 | 203 | destroy_workqueue(channel->controlwq); |
3e7ee490 | 204 | |
8c69f52a | 205 | kfree(channel); |
3e7ee490 HJ |
206 | } |
207 | ||
3e189519 | 208 | /* |
e98cb276 | 209 | * free_channel - Release the resources used by the vmbus channel object |
bd60c33e | 210 | */ |
9f3e28e3 | 211 | static void free_channel(struct vmbus_channel *channel) |
3e7ee490 | 212 | { |
3e7ee490 | 213 | |
bd60c33e GKH |
214 | /* |
215 | * We have to release the channel's workqueue/thread in the vmbus's | |
216 | * workqueue/thread context | |
217 | * ie we can't destroy ourselves. | |
218 | */ | |
4b2f9abe | 219 | INIT_WORK(&channel->work, release_channel); |
da9fcb72 | 220 | queue_work(vmbus_connection.work_queue, &channel->work); |
3e7ee490 HJ |
221 | } |
222 | ||
3a28fa35 S |
223 | static void percpu_channel_enq(void *arg) |
224 | { | |
225 | struct vmbus_channel *channel = arg; | |
226 | int cpu = smp_processor_id(); | |
227 | ||
228 | list_add_tail(&channel->percpu_list, &hv_context.percpu_list[cpu]); | |
229 | } | |
8b5d6d3b | 230 | |
3a28fa35 S |
231 | static void percpu_channel_deq(void *arg) |
232 | { | |
233 | struct vmbus_channel *channel = arg; | |
234 | ||
235 | list_del(&channel->percpu_list); | |
236 | } | |
8b5d6d3b | 237 | |
ed6cfcc5 S |
238 | |
239 | void hv_process_channel_removal(struct vmbus_channel *channel, u32 relid) | |
4b2f9abe | 240 | { |
ed6cfcc5 | 241 | struct vmbus_channel_relid_released msg; |
c8705979 | 242 | unsigned long flags; |
e68d2971 | 243 | struct vmbus_channel *primary_channel; |
4b2f9abe | 244 | |
c8705979 | 245 | memset(&msg, 0, sizeof(struct vmbus_channel_relid_released)); |
ed6cfcc5 | 246 | msg.child_relid = relid; |
c8705979 S |
247 | msg.header.msgtype = CHANNELMSG_RELID_RELEASED; |
248 | vmbus_post_msg(&msg, sizeof(struct vmbus_channel_relid_released)); | |
249 | ||
ed6cfcc5 S |
250 | if (channel == NULL) |
251 | return; | |
252 | ||
2115b561 S |
253 | if (channel->target_cpu != get_cpu()) { |
254 | put_cpu(); | |
3a28fa35 S |
255 | smp_call_function_single(channel->target_cpu, |
256 | percpu_channel_deq, channel, true); | |
2115b561 | 257 | } else { |
3a28fa35 | 258 | percpu_channel_deq(channel); |
2115b561 S |
259 | put_cpu(); |
260 | } | |
3a28fa35 | 261 | |
e68d2971 S |
262 | if (channel->primary_channel == NULL) { |
263 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
264 | list_del(&channel->listentry); | |
265 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
266 | } else { | |
267 | primary_channel = channel->primary_channel; | |
67fae053 | 268 | spin_lock_irqsave(&primary_channel->lock, flags); |
565ce642 | 269 | list_del(&channel->sc_list); |
67fae053 | 270 | spin_unlock_irqrestore(&primary_channel->lock, flags); |
e68d2971 | 271 | } |
c8705979 | 272 | free_channel(channel); |
4b2f9abe | 273 | } |
8b5d6d3b | 274 | |
93e5bd06 S |
275 | void vmbus_free_channels(void) |
276 | { | |
277 | struct vmbus_channel *channel; | |
278 | ||
279 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { | |
280 | vmbus_device_unregister(channel->device_obj); | |
93e5bd06 S |
281 | free_channel(channel); |
282 | } | |
283 | } | |
284 | ||
3e189519 | 285 | /* |
e98cb276 | 286 | * vmbus_process_offer - Process the offer by creating a channel/device |
c88c4e4c | 287 | * associated with this offer |
bd60c33e | 288 | */ |
2dd37cb8 | 289 | static void vmbus_process_offer(struct vmbus_channel *newchannel) |
3e7ee490 | 290 | { |
aded7165 | 291 | struct vmbus_channel *channel; |
188963ec | 292 | bool fnew = true; |
3a28fa35 | 293 | bool enq = false; |
bd60c33e | 294 | int ret; |
0f5e44ca | 295 | unsigned long flags; |
3e7ee490 | 296 | |
454f18a9 | 297 | /* Make sure this is a new offer */ |
15b2f647 | 298 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 299 | |
da9fcb72 | 300 | list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) { |
358d2ee2 S |
301 | if (!uuid_le_cmp(channel->offermsg.offer.if_type, |
302 | newchannel->offermsg.offer.if_type) && | |
303 | !uuid_le_cmp(channel->offermsg.offer.if_instance, | |
304 | newchannel->offermsg.offer.if_instance)) { | |
188963ec | 305 | fnew = false; |
3e7ee490 HJ |
306 | break; |
307 | } | |
308 | } | |
309 | ||
3a28fa35 | 310 | if (fnew) { |
c50f7fb2 | 311 | list_add_tail(&newchannel->listentry, |
da9fcb72 | 312 | &vmbus_connection.chn_list); |
3a28fa35 S |
313 | enq = true; |
314 | } | |
bd60c33e | 315 | |
15b2f647 | 316 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); |
3e7ee490 | 317 | |
3a28fa35 | 318 | if (enq) { |
2115b561 S |
319 | if (newchannel->target_cpu != get_cpu()) { |
320 | put_cpu(); | |
3a28fa35 S |
321 | smp_call_function_single(newchannel->target_cpu, |
322 | percpu_channel_enq, | |
323 | newchannel, true); | |
2115b561 | 324 | } else { |
3a28fa35 | 325 | percpu_channel_enq(newchannel); |
2115b561 S |
326 | put_cpu(); |
327 | } | |
3a28fa35 | 328 | } |
188963ec | 329 | if (!fnew) { |
e68d2971 S |
330 | /* |
331 | * Check to see if this is a sub-channel. | |
332 | */ | |
333 | if (newchannel->offermsg.offer.sub_channel_index != 0) { | |
334 | /* | |
335 | * Process the sub-channel. | |
336 | */ | |
337 | newchannel->primary_channel = channel; | |
67fae053 | 338 | spin_lock_irqsave(&channel->lock, flags); |
e68d2971 | 339 | list_add_tail(&newchannel->sc_list, &channel->sc_list); |
67fae053 | 340 | spin_unlock_irqrestore(&channel->lock, flags); |
3a28fa35 | 341 | |
2115b561 S |
342 | if (newchannel->target_cpu != get_cpu()) { |
343 | put_cpu(); | |
3a28fa35 S |
344 | smp_call_function_single(newchannel->target_cpu, |
345 | percpu_channel_enq, | |
346 | newchannel, true); | |
2115b561 | 347 | } else { |
3a28fa35 | 348 | percpu_channel_enq(newchannel); |
2115b561 S |
349 | put_cpu(); |
350 | } | |
3a28fa35 | 351 | |
e68d2971 S |
352 | newchannel->state = CHANNEL_OPEN_STATE; |
353 | if (channel->sc_creation_callback != NULL) | |
2dd37cb8 S |
354 | /* |
355 | * We need to invoke the sub-channel creation | |
356 | * callback; invoke this in a seperate work | |
357 | * context since we are currently running on | |
358 | * the global work context in which we handle | |
359 | * messages from the host. | |
360 | */ | |
361 | INIT_WORK(&newchannel->work, | |
362 | vmbus_sc_creation_cb); | |
363 | queue_work(newchannel->controlwq, | |
364 | &newchannel->work); | |
365 | ||
366 | return; | |
e68d2971 S |
367 | } |
368 | ||
9c3a6f7e | 369 | goto err_free_chan; |
3e7ee490 HJ |
370 | } |
371 | ||
42dceebe S |
372 | /* |
373 | * This state is used to indicate a successful open | |
374 | * so that when we do close the channel normally, we | |
375 | * can cleanup properly | |
376 | */ | |
377 | newchannel->state = CHANNEL_OPEN_STATE; | |
378 | ||
bd60c33e GKH |
379 | /* |
380 | * Start the process of binding this offer to the driver | |
381 | * We need to set the DeviceObject field before calling | |
646f1ea3 | 382 | * vmbus_child_dev_add() |
bd60c33e | 383 | */ |
f2c73011 | 384 | newchannel->device_obj = vmbus_device_create( |
767dff68 HZ |
385 | &newchannel->offermsg.offer.if_type, |
386 | &newchannel->offermsg.offer.if_instance, | |
188963ec | 387 | newchannel); |
9c3a6f7e | 388 | if (!newchannel->device_obj) |
5b1e5b53 | 389 | goto err_deq_chan; |
3e7ee490 | 390 | |
454f18a9 BP |
391 | /* |
392 | * Add the new device to the bus. This will kick off device-driver | |
393 | * binding which eventually invokes the device driver's AddDevice() | |
394 | * method. | |
395 | */ | |
22794281 | 396 | ret = vmbus_device_register(newchannel->device_obj); |
bd60c33e | 397 | if (ret != 0) { |
0a46618d | 398 | pr_err("unable to add child device object (relid %d)\n", |
c50f7fb2 | 399 | newchannel->offermsg.child_relid); |
3e7ee490 | 400 | |
8b8ee675 | 401 | kfree(newchannel->device_obj); |
5b1e5b53 | 402 | goto err_deq_chan; |
3e7ee490 | 403 | } |
2dd37cb8 | 404 | |
9c3a6f7e | 405 | return; |
2dd37cb8 | 406 | |
5b1e5b53 S |
407 | err_deq_chan: |
408 | spin_lock_irqsave(&vmbus_connection.channel_lock, flags); | |
409 | list_del(&newchannel->listentry); | |
410 | spin_unlock_irqrestore(&vmbus_connection.channel_lock, flags); | |
411 | ||
412 | if (newchannel->target_cpu != get_cpu()) { | |
413 | put_cpu(); | |
414 | smp_call_function_single(newchannel->target_cpu, | |
415 | percpu_channel_deq, newchannel, true); | |
416 | } else { | |
417 | percpu_channel_deq(newchannel); | |
418 | put_cpu(); | |
419 | } | |
420 | ||
9c3a6f7e VK |
421 | err_free_chan: |
422 | free_channel(newchannel); | |
3e7ee490 HJ |
423 | } |
424 | ||
a119845f S |
425 | enum { |
426 | IDE = 0, | |
427 | SCSI, | |
428 | NIC, | |
429 | MAX_PERF_CHN, | |
430 | }; | |
431 | ||
432 | /* | |
7fb96565 | 433 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
434 | * We attempt to distribute the interrupt load for these devices across |
435 | * all available CPUs. | |
436 | */ | |
7fb96565 | 437 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 438 | /* IDE */ |
7fb96565 | 439 | { HV_IDE_GUID, }, |
a119845f | 440 | /* Storage - SCSI */ |
7fb96565 | 441 | { HV_SCSI_GUID, }, |
a119845f | 442 | /* Network */ |
7fb96565 | 443 | { HV_NIC_GUID, }, |
04653a00 S |
444 | /* NetworkDirect Guest RDMA */ |
445 | { HV_ND_GUID, }, | |
a119845f S |
446 | }; |
447 | ||
448 | ||
449 | /* | |
450 | * We use this state to statically distribute the channel interrupt load. | |
451 | */ | |
452 | static u32 next_vp; | |
453 | ||
454 | /* | |
455 | * Starting with Win8, we can statically distribute the incoming | |
456 | * channel interrupt load by binding a channel to VCPU. We | |
457 | * implement here a simple round robin scheme for distributing | |
458 | * the interrupt load. | |
459 | * We will bind channels that are not performance critical to cpu 0 and | |
460 | * performance critical channels (IDE, SCSI and Network) will be uniformly | |
461 | * distributed across all available CPUs. | |
462 | */ | |
f9da455b | 463 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
464 | { |
465 | u32 cur_cpu; | |
466 | int i; | |
467 | bool perf_chn = false; | |
468 | u32 max_cpus = num_online_cpus(); | |
469 | ||
470 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 471 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
472 | sizeof(uuid_le))) { |
473 | perf_chn = true; | |
474 | break; | |
475 | } | |
476 | } | |
477 | if ((vmbus_proto_version == VERSION_WS2008) || | |
478 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
479 | /* | |
480 | * Prior to win8, all channel interrupts are | |
481 | * delivered on cpu 0. | |
482 | * Also if the channel is not a performance critical | |
483 | * channel, bind it to cpu 0. | |
484 | */ | |
d3ba720d S |
485 | channel->target_cpu = 0; |
486 | channel->target_vp = 0; | |
487 | return; | |
a119845f S |
488 | } |
489 | cur_cpu = (++next_vp % max_cpus); | |
d3ba720d S |
490 | channel->target_cpu = cur_cpu; |
491 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
492 | } |
493 | ||
3e189519 | 494 | /* |
e98cb276 | 495 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 496 | * |
bd60c33e | 497 | */ |
e98cb276 | 498 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 499 | { |
bd60c33e | 500 | struct vmbus_channel_offer_channel *offer; |
188963ec | 501 | struct vmbus_channel *newchannel; |
3e7ee490 | 502 | |
bd60c33e | 503 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 504 | |
454f18a9 | 505 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 506 | newchannel = alloc_channel(); |
188963ec | 507 | if (!newchannel) { |
0a46618d | 508 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
509 | return; |
510 | } | |
511 | ||
132368bd S |
512 | /* |
513 | * By default we setup state to enable batched | |
514 | * reading. A specific service can choose to | |
515 | * disable this prior to opening the channel. | |
516 | */ | |
517 | newchannel->batched_reading = true; | |
518 | ||
b3bf60c7 S |
519 | /* |
520 | * Setup state for signalling the host. | |
521 | */ | |
522 | newchannel->sig_event = (struct hv_input_signal_event *) | |
523 | (ALIGN((unsigned long) | |
524 | &newchannel->sig_buf, | |
525 | HV_HYPERCALL_PARAM_ALIGN)); | |
526 | ||
527 | newchannel->sig_event->connectionid.asu32 = 0; | |
528 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
529 | newchannel->sig_event->flag_number = 0; | |
530 | newchannel->sig_event->rsvdz = 0; | |
531 | ||
532 | if (vmbus_proto_version != VERSION_WS2008) { | |
533 | newchannel->is_dedicated_interrupt = | |
534 | (offer->is_dedicated_interrupt != 0); | |
535 | newchannel->sig_event->connectionid.u.id = | |
536 | offer->connection_id; | |
537 | } | |
538 | ||
d3ba720d | 539 | init_vp_index(newchannel, &offer->offer.if_type); |
abbf3b2a | 540 | |
c50f7fb2 | 541 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 542 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
543 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
544 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 545 | |
2dd37cb8 | 546 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
547 | } |
548 | ||
3e189519 | 549 | /* |
e98cb276 | 550 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
551 | * |
552 | * We queue a work item to process this offer synchronously | |
553 | */ | |
e98cb276 | 554 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 555 | { |
bd60c33e | 556 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 557 | struct vmbus_channel *channel; |
d7f2fbaf | 558 | unsigned long flags; |
3e7ee490 | 559 | |
bd60c33e | 560 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
c6977677 | 561 | channel = relid2channel(rescind->child_relid); |
98e08702 | 562 | |
2dd37cb8 S |
563 | if (channel == NULL) { |
564 | hv_process_channel_removal(NULL, rescind->child_relid); | |
3e7ee490 | 565 | return; |
2dd37cb8 | 566 | } |
3e7ee490 | 567 | |
d7f2fbaf | 568 | spin_lock_irqsave(&channel->lock, flags); |
c3582a2c | 569 | channel->rescind = true; |
d7f2fbaf | 570 | spin_unlock_irqrestore(&channel->lock, flags); |
2dd37cb8 S |
571 | |
572 | if (channel->device_obj) { | |
573 | /* | |
574 | * We will have to unregister this device from the | |
575 | * driver core. Do this in the per-channel work context. | |
576 | * Note that we are currently executing on the global | |
577 | * workq for handling messages from the host. | |
578 | */ | |
579 | INIT_WORK(&channel->work, vmbus_process_device_unregister); | |
580 | queue_work(channel->controlwq, &channel->work); | |
581 | } else { | |
582 | hv_process_channel_removal(channel, | |
583 | channel->offermsg.child_relid); | |
584 | } | |
3e7ee490 HJ |
585 | } |
586 | ||
3e189519 | 587 | /* |
e98cb276 HZ |
588 | * vmbus_onoffers_delivered - |
589 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
590 | * |
591 | * Nothing to do here. | |
592 | */ | |
e98cb276 | 593 | static void vmbus_onoffers_delivered( |
bd60c33e | 594 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 595 | { |
3e7ee490 HJ |
596 | } |
597 | ||
3e189519 | 598 | /* |
e98cb276 | 599 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
600 | * |
601 | * This is invoked when we received a response to our channel open request. | |
602 | * Find the matching request, copy the response and signal the requesting | |
603 | * thread. | |
604 | */ | |
e98cb276 | 605 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 606 | { |
bd60c33e | 607 | struct vmbus_channel_open_result *result; |
188963ec HZ |
608 | struct vmbus_channel_msginfo *msginfo; |
609 | struct vmbus_channel_message_header *requestheader; | |
610 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 611 | unsigned long flags; |
3e7ee490 | 612 | |
bd60c33e | 613 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 614 | |
bd60c33e GKH |
615 | /* |
616 | * Find the open msg, copy the result and signal/unblock the wait event | |
617 | */ | |
15b2f647 | 618 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 619 | |
ebb61e5f HJ |
620 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
621 | msglistentry) { | |
188963ec | 622 | requestheader = |
c50f7fb2 | 623 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 624 | |
c50f7fb2 | 625 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 626 | openmsg = |
c50f7fb2 HZ |
627 | (struct vmbus_channel_open_channel *)msginfo->msg; |
628 | if (openmsg->child_relid == result->child_relid && | |
629 | openmsg->openid == result->openid) { | |
630 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 631 | result, |
9568a193 S |
632 | sizeof( |
633 | struct vmbus_channel_open_result)); | |
634 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
635 | break; |
636 | } | |
637 | } | |
638 | } | |
15b2f647 | 639 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
640 | } |
641 | ||
3e189519 | 642 | /* |
e98cb276 | 643 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
644 | * |
645 | * This is invoked when we received a response to our gpadl create request. | |
646 | * Find the matching request, copy the response and signal the requesting | |
647 | * thread. | |
648 | */ | |
e98cb276 | 649 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 650 | { |
188963ec | 651 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
652 | struct vmbus_channel_msginfo *msginfo; |
653 | struct vmbus_channel_message_header *requestheader; | |
654 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 655 | unsigned long flags; |
3e7ee490 | 656 | |
188963ec | 657 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 658 | |
bd60c33e GKH |
659 | /* |
660 | * Find the establish msg, copy the result and signal/unblock the wait | |
661 | * event | |
662 | */ | |
15b2f647 | 663 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 664 | |
ebb61e5f HJ |
665 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
666 | msglistentry) { | |
188963ec | 667 | requestheader = |
c50f7fb2 | 668 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 669 | |
c50f7fb2 | 670 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
671 | gpadlheader = |
672 | (struct vmbus_channel_gpadl_header *)requestheader; | |
673 | ||
c50f7fb2 HZ |
674 | if ((gpadlcreated->child_relid == |
675 | gpadlheader->child_relid) && | |
676 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
677 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 678 | gpadlcreated, |
9568a193 S |
679 | sizeof( |
680 | struct vmbus_channel_gpadl_created)); | |
681 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
682 | break; |
683 | } | |
684 | } | |
685 | } | |
15b2f647 | 686 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
687 | } |
688 | ||
3e189519 | 689 | /* |
e98cb276 | 690 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
691 | * |
692 | * This is invoked when we received a response to our gpadl teardown request. | |
693 | * Find the matching request, copy the response and signal the requesting | |
694 | * thread. | |
695 | */ | |
e98cb276 | 696 | static void vmbus_ongpadl_torndown( |
bd60c33e | 697 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 698 | { |
188963ec | 699 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
700 | struct vmbus_channel_msginfo *msginfo; |
701 | struct vmbus_channel_message_header *requestheader; | |
702 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 703 | unsigned long flags; |
3e7ee490 | 704 | |
188963ec | 705 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
706 | |
707 | /* | |
708 | * Find the open msg, copy the result and signal/unblock the wait event | |
709 | */ | |
15b2f647 | 710 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 711 | |
ebb61e5f HJ |
712 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
713 | msglistentry) { | |
188963ec | 714 | requestheader = |
c50f7fb2 | 715 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 716 | |
c50f7fb2 | 717 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
718 | gpadl_teardown = |
719 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 720 | |
c50f7fb2 HZ |
721 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
722 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 723 | gpadl_torndown, |
9568a193 S |
724 | sizeof( |
725 | struct vmbus_channel_gpadl_torndown)); | |
726 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
727 | break; |
728 | } | |
729 | } | |
730 | } | |
15b2f647 | 731 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
732 | } |
733 | ||
3e189519 | 734 | /* |
e98cb276 | 735 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
736 | * |
737 | * This is invoked when we received a response to our initiate contact request. | |
738 | * Find the matching request, copy the response and signal the requesting | |
739 | * thread. | |
740 | */ | |
e98cb276 | 741 | static void vmbus_onversion_response( |
bd60c33e | 742 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 743 | { |
188963ec HZ |
744 | struct vmbus_channel_msginfo *msginfo; |
745 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 746 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 747 | unsigned long flags; |
3e7ee490 | 748 | |
188963ec | 749 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 750 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 751 | |
ebb61e5f HJ |
752 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
753 | msglistentry) { | |
188963ec | 754 | requestheader = |
c50f7fb2 | 755 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 756 | |
c50f7fb2 HZ |
757 | if (requestheader->msgtype == |
758 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 759 | memcpy(&msginfo->response.version_response, |
188963ec | 760 | version_response, |
bd60c33e | 761 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 762 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
763 | } |
764 | } | |
15b2f647 | 765 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
766 | } |
767 | ||
c8212f04 GKH |
768 | /* Channel message dispatch table */ |
769 | static struct vmbus_channel_message_table_entry | |
b7c6b02f | 770 | channel_message_table[CHANNELMSG_COUNT] = { |
c50f7fb2 HZ |
771 | {CHANNELMSG_INVALID, NULL}, |
772 | {CHANNELMSG_OFFERCHANNEL, vmbus_onoffer}, | |
773 | {CHANNELMSG_RESCIND_CHANNELOFFER, vmbus_onoffer_rescind}, | |
774 | {CHANNELMSG_REQUESTOFFERS, NULL}, | |
775 | {CHANNELMSG_ALLOFFERS_DELIVERED, vmbus_onoffers_delivered}, | |
776 | {CHANNELMSG_OPENCHANNEL, NULL}, | |
777 | {CHANNELMSG_OPENCHANNEL_RESULT, vmbus_onopen_result}, | |
778 | {CHANNELMSG_CLOSECHANNEL, NULL}, | |
779 | {CHANNELMSG_GPADL_HEADER, NULL}, | |
780 | {CHANNELMSG_GPADL_BODY, NULL}, | |
781 | {CHANNELMSG_GPADL_CREATED, vmbus_ongpadl_created}, | |
782 | {CHANNELMSG_GPADL_TEARDOWN, NULL}, | |
783 | {CHANNELMSG_GPADL_TORNDOWN, vmbus_ongpadl_torndown}, | |
784 | {CHANNELMSG_RELID_RELEASED, NULL}, | |
785 | {CHANNELMSG_INITIATE_CONTACT, NULL}, | |
786 | {CHANNELMSG_VERSION_RESPONSE, vmbus_onversion_response}, | |
787 | {CHANNELMSG_UNLOAD, NULL}, | |
c8212f04 GKH |
788 | }; |
789 | ||
3e189519 | 790 | /* |
e98cb276 | 791 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
792 | * |
793 | * This is invoked in the vmbus worker thread context. | |
794 | */ | |
e98cb276 | 795 | void vmbus_onmessage(void *context) |
3e7ee490 | 796 | { |
188963ec | 797 | struct hv_message *msg = context; |
82250213 | 798 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
799 | int size; |
800 | ||
f6feebe0 HZ |
801 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
802 | size = msg->header.payload_size; | |
3e7ee490 | 803 | |
c50f7fb2 | 804 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 805 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 806 | hdr->msgtype, size); |
04f50c4d | 807 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 808 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
809 | return; |
810 | } | |
811 | ||
b7c6b02f S |
812 | if (channel_message_table[hdr->msgtype].message_handler) |
813 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 814 | else |
0a46618d | 815 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
816 | } |
817 | ||
3e189519 | 818 | /* |
e98cb276 | 819 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 820 | */ |
e98cb276 | 821 | int vmbus_request_offers(void) |
3e7ee490 | 822 | { |
82250213 | 823 | struct vmbus_channel_message_header *msg; |
188963ec | 824 | struct vmbus_channel_msginfo *msginfo; |
51e5181d NMG |
825 | int ret; |
826 | unsigned long t; | |
3e7ee490 | 827 | |
188963ec | 828 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
829 | sizeof(struct vmbus_channel_message_header), |
830 | GFP_KERNEL); | |
188963ec | 831 | if (!msginfo) |
75910f23 | 832 | return -ENOMEM; |
3e7ee490 | 833 | |
9568a193 | 834 | init_completion(&msginfo->waitevent); |
75910f23 | 835 | |
c50f7fb2 | 836 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 837 | |
c50f7fb2 | 838 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 839 | |
3e7ee490 | 840 | |
c6977677 | 841 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
842 | sizeof(struct vmbus_channel_message_header)); |
843 | if (ret != 0) { | |
0a46618d | 844 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 845 | |
0c3b7b2f S |
846 | goto cleanup; |
847 | } | |
3e7ee490 | 848 | |
2dfde964 | 849 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 850 | if (t == 0) { |
0c3b7b2f S |
851 | ret = -ETIMEDOUT; |
852 | goto cleanup; | |
3e7ee490 | 853 | } |
3e7ee490 | 854 | |
3e7ee490 HJ |
855 | |
856 | ||
0c3b7b2f | 857 | cleanup: |
dd9b15dc | 858 | kfree(msginfo); |
3e7ee490 | 859 | |
3e7ee490 HJ |
860 | return ret; |
861 | } | |
862 | ||
e68d2971 S |
863 | /* |
864 | * Retrieve the (sub) channel on which to send an outgoing request. | |
865 | * When a primary channel has multiple sub-channels, we choose a | |
866 | * channel whose VCPU binding is closest to the VCPU on which | |
867 | * this call is being made. | |
868 | */ | |
869 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
870 | { | |
871 | struct list_head *cur, *tmp; | |
87712bf8 | 872 | int cur_cpu; |
e68d2971 S |
873 | struct vmbus_channel *cur_channel; |
874 | struct vmbus_channel *outgoing_channel = primary; | |
875 | int cpu_distance, new_cpu_distance; | |
876 | ||
877 | if (list_empty(&primary->sc_list)) | |
878 | return outgoing_channel; | |
879 | ||
87712bf8 S |
880 | cur_cpu = hv_context.vp_index[get_cpu()]; |
881 | put_cpu(); | |
e68d2971 S |
882 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
883 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
884 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
885 | continue; | |
886 | ||
887 | if (cur_channel->target_vp == cur_cpu) | |
888 | return cur_channel; | |
889 | ||
890 | cpu_distance = ((outgoing_channel->target_vp > cur_cpu) ? | |
891 | (outgoing_channel->target_vp - cur_cpu) : | |
892 | (cur_cpu - outgoing_channel->target_vp)); | |
893 | ||
894 | new_cpu_distance = ((cur_channel->target_vp > cur_cpu) ? | |
895 | (cur_channel->target_vp - cur_cpu) : | |
896 | (cur_cpu - cur_channel->target_vp)); | |
897 | ||
898 | if (cpu_distance < new_cpu_distance) | |
899 | continue; | |
900 | ||
901 | outgoing_channel = cur_channel; | |
902 | } | |
903 | ||
904 | return outgoing_channel; | |
905 | } | |
906 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
907 | ||
908 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
909 | { | |
910 | struct list_head *cur, *tmp; | |
911 | struct vmbus_channel *cur_channel; | |
912 | ||
913 | if (primary_channel->sc_creation_callback == NULL) | |
914 | return; | |
915 | ||
916 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
917 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
918 | ||
919 | primary_channel->sc_creation_callback(cur_channel); | |
920 | } | |
921 | } | |
922 | ||
923 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
924 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
925 | { | |
926 | primary_channel->sc_creation_callback = sc_cr_cb; | |
927 | } | |
928 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
929 | ||
930 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
931 | { | |
932 | bool ret; | |
933 | ||
934 | ret = !list_empty(&primary->sc_list); | |
935 | ||
936 | if (ret) { | |
937 | /* | |
938 | * Invoke the callback on sub-channel creation. | |
939 | * This will present a uniform interface to the | |
940 | * clients. | |
941 | */ | |
942 | invoke_sc_cb(primary); | |
943 | } | |
944 | ||
945 | return ret; | |
946 | } | |
947 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |