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Commit | Line | Data |
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3e7ee490 | 1 | /* |
3e7ee490 HJ |
2 | * Copyright (c) 2009, Microsoft Corporation. |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify it | |
5 | * under the terms and conditions of the GNU General Public License, | |
6 | * version 2, as published by the Free Software Foundation. | |
7 | * | |
8 | * This program is distributed in the hope it will be useful, but WITHOUT | |
9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
11 | * more details. | |
12 | * | |
13 | * You should have received a copy of the GNU General Public License along with | |
14 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple | |
15 | * Place - Suite 330, Boston, MA 02111-1307 USA. | |
16 | * | |
17 | * Authors: | |
18 | * Haiyang Zhang <haiyangz@microsoft.com> | |
19 | * Hank Janssen <hjanssen@microsoft.com> | |
3e7ee490 | 20 | */ |
0a46618d HJ |
21 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
22 | ||
a0086dc5 | 23 | #include <linux/kernel.h> |
0c3b7b2f S |
24 | #include <linux/sched.h> |
25 | #include <linux/wait.h> | |
a0086dc5 | 26 | #include <linux/mm.h> |
5a0e3ad6 | 27 | #include <linux/slab.h> |
53af545b | 28 | #include <linux/list.h> |
c88c4e4c | 29 | #include <linux/module.h> |
8b5d6d3b | 30 | #include <linux/completion.h> |
46a97191 | 31 | #include <linux/hyperv.h> |
3f335ea2 | 32 | |
0f2a6619 | 33 | #include "hyperv_vmbus.h" |
3e7ee490 | 34 | |
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, | |
379e4f75 | 350 | ND_NIC, |
a119845f S |
351 | MAX_PERF_CHN, |
352 | }; | |
353 | ||
354 | /* | |
7fb96565 | 355 | * This is an array of device_ids (device types) that are performance critical. |
a119845f S |
356 | * We attempt to distribute the interrupt load for these devices across |
357 | * all available CPUs. | |
358 | */ | |
7fb96565 | 359 | static const struct hv_vmbus_device_id hp_devs[] = { |
a119845f | 360 | /* IDE */ |
7fb96565 | 361 | { HV_IDE_GUID, }, |
a119845f | 362 | /* Storage - SCSI */ |
7fb96565 | 363 | { HV_SCSI_GUID, }, |
a119845f | 364 | /* Network */ |
7fb96565 | 365 | { HV_NIC_GUID, }, |
04653a00 S |
366 | /* NetworkDirect Guest RDMA */ |
367 | { HV_ND_GUID, }, | |
a119845f S |
368 | }; |
369 | ||
370 | ||
371 | /* | |
372 | * We use this state to statically distribute the channel interrupt load. | |
373 | */ | |
1f656ff3 | 374 | static int next_numa_node_id; |
a119845f S |
375 | |
376 | /* | |
377 | * Starting with Win8, we can statically distribute the incoming | |
1f656ff3 S |
378 | * channel interrupt load by binding a channel to VCPU. |
379 | * We do this in a hierarchical fashion: | |
380 | * First distribute the primary channels across available NUMA nodes | |
381 | * and then distribute the subchannels amongst the CPUs in the NUMA | |
382 | * node assigned to the primary channel. | |
383 | * | |
384 | * For pre-win8 hosts or non-performance critical channels we assign the | |
385 | * first CPU in the first NUMA node. | |
a119845f | 386 | */ |
f9da455b | 387 | static void init_vp_index(struct vmbus_channel *channel, const uuid_le *type_guid) |
a119845f S |
388 | { |
389 | u32 cur_cpu; | |
390 | int i; | |
391 | bool perf_chn = false; | |
1f656ff3 S |
392 | struct vmbus_channel *primary = channel->primary_channel; |
393 | int next_node; | |
394 | struct cpumask available_mask; | |
9f01ec53 | 395 | struct cpumask *alloced_mask; |
a119845f S |
396 | |
397 | for (i = IDE; i < MAX_PERF_CHN; i++) { | |
7fb96565 | 398 | if (!memcmp(type_guid->b, hp_devs[i].guid, |
a119845f S |
399 | sizeof(uuid_le))) { |
400 | perf_chn = true; | |
401 | break; | |
402 | } | |
403 | } | |
404 | if ((vmbus_proto_version == VERSION_WS2008) || | |
405 | (vmbus_proto_version == VERSION_WIN7) || (!perf_chn)) { | |
406 | /* | |
407 | * Prior to win8, all channel interrupts are | |
408 | * delivered on cpu 0. | |
409 | * Also if the channel is not a performance critical | |
410 | * channel, bind it to cpu 0. | |
411 | */ | |
1f656ff3 | 412 | channel->numa_node = 0; |
d3ba720d | 413 | channel->target_cpu = 0; |
9c6e64ad | 414 | channel->target_vp = hv_context.vp_index[0]; |
d3ba720d | 415 | return; |
a119845f | 416 | } |
ce59fec8 VK |
417 | |
418 | /* | |
1f656ff3 S |
419 | * We distribute primary channels evenly across all the available |
420 | * NUMA nodes and within the assigned NUMA node we will assign the | |
421 | * first available CPU to the primary channel. | |
422 | * The sub-channels will be assigned to the CPUs available in the | |
423 | * NUMA node evenly. | |
ce59fec8 | 424 | */ |
1f656ff3 S |
425 | if (!primary) { |
426 | while (true) { | |
427 | next_node = next_numa_node_id++; | |
428 | if (next_node == nr_node_ids) | |
429 | next_node = next_numa_node_id = 0; | |
430 | if (cpumask_empty(cpumask_of_node(next_node))) | |
431 | continue; | |
432 | break; | |
433 | } | |
434 | channel->numa_node = next_node; | |
435 | primary = channel; | |
436 | } | |
9f01ec53 | 437 | alloced_mask = &hv_context.hv_numa_map[primary->numa_node]; |
1f656ff3 | 438 | |
9f01ec53 | 439 | if (cpumask_weight(alloced_mask) == |
1f656ff3 | 440 | cpumask_weight(cpumask_of_node(primary->numa_node))) { |
ce59fec8 | 441 | /* |
1f656ff3 S |
442 | * We have cycled through all the CPUs in the node; |
443 | * reset the alloced map. | |
ce59fec8 | 444 | */ |
9f01ec53 | 445 | cpumask_clear(alloced_mask); |
ce59fec8 VK |
446 | } |
447 | ||
9f01ec53 | 448 | cpumask_xor(&available_mask, alloced_mask, |
1f656ff3 S |
449 | cpumask_of_node(primary->numa_node)); |
450 | ||
3b71107d DC |
451 | cur_cpu = -1; |
452 | while (true) { | |
453 | cur_cpu = cpumask_next(cur_cpu, &available_mask); | |
454 | if (cur_cpu >= nr_cpu_ids) { | |
455 | cur_cpu = -1; | |
456 | cpumask_copy(&available_mask, | |
457 | cpumask_of_node(primary->numa_node)); | |
458 | continue; | |
459 | } | |
460 | ||
461 | if (!cpumask_test_cpu(cur_cpu, | |
462 | &primary->alloced_cpus_in_node)) { | |
463 | cpumask_set_cpu(cur_cpu, | |
464 | &primary->alloced_cpus_in_node); | |
465 | cpumask_set_cpu(cur_cpu, alloced_mask); | |
466 | break; | |
467 | } | |
468 | } | |
1f656ff3 | 469 | |
d3ba720d S |
470 | channel->target_cpu = cur_cpu; |
471 | channel->target_vp = hv_context.vp_index[cur_cpu]; | |
a119845f S |
472 | } |
473 | ||
2db84eff S |
474 | /* |
475 | * vmbus_unload_response - Handler for the unload response. | |
476 | */ | |
477 | static void vmbus_unload_response(struct vmbus_channel_message_header *hdr) | |
478 | { | |
479 | /* | |
480 | * This is a global event; just wakeup the waiting thread. | |
481 | * Once we successfully unload, we can cleanup the monitor state. | |
482 | */ | |
483 | complete(&vmbus_connection.unload_event); | |
484 | } | |
485 | ||
486 | void vmbus_initiate_unload(void) | |
487 | { | |
488 | struct vmbus_channel_message_header hdr; | |
489 | ||
4a54243f VK |
490 | /* Pre-Win2012R2 hosts don't support reconnect */ |
491 | if (vmbus_proto_version < VERSION_WIN8_1) | |
492 | return; | |
493 | ||
2db84eff S |
494 | init_completion(&vmbus_connection.unload_event); |
495 | memset(&hdr, 0, sizeof(struct vmbus_channel_message_header)); | |
496 | hdr.msgtype = CHANNELMSG_UNLOAD; | |
497 | vmbus_post_msg(&hdr, sizeof(struct vmbus_channel_message_header)); | |
498 | ||
499 | wait_for_completion(&vmbus_connection.unload_event); | |
500 | } | |
501 | ||
3e189519 | 502 | /* |
e98cb276 | 503 | * vmbus_onoffer - Handler for channel offers from vmbus in parent partition. |
bd60c33e | 504 | * |
bd60c33e | 505 | */ |
e98cb276 | 506 | static void vmbus_onoffer(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 507 | { |
bd60c33e | 508 | struct vmbus_channel_offer_channel *offer; |
188963ec | 509 | struct vmbus_channel *newchannel; |
3e7ee490 | 510 | |
bd60c33e | 511 | offer = (struct vmbus_channel_offer_channel *)hdr; |
3e7ee490 | 512 | |
454f18a9 | 513 | /* Allocate the channel object and save this offer. */ |
e98cb276 | 514 | newchannel = alloc_channel(); |
188963ec | 515 | if (!newchannel) { |
0a46618d | 516 | pr_err("Unable to allocate channel object\n"); |
3e7ee490 HJ |
517 | return; |
518 | } | |
519 | ||
132368bd S |
520 | /* |
521 | * By default we setup state to enable batched | |
522 | * reading. A specific service can choose to | |
523 | * disable this prior to opening the channel. | |
524 | */ | |
525 | newchannel->batched_reading = true; | |
526 | ||
b3bf60c7 S |
527 | /* |
528 | * Setup state for signalling the host. | |
529 | */ | |
530 | newchannel->sig_event = (struct hv_input_signal_event *) | |
531 | (ALIGN((unsigned long) | |
532 | &newchannel->sig_buf, | |
533 | HV_HYPERCALL_PARAM_ALIGN)); | |
534 | ||
535 | newchannel->sig_event->connectionid.asu32 = 0; | |
536 | newchannel->sig_event->connectionid.u.id = VMBUS_EVENT_CONNECTION_ID; | |
537 | newchannel->sig_event->flag_number = 0; | |
538 | newchannel->sig_event->rsvdz = 0; | |
539 | ||
540 | if (vmbus_proto_version != VERSION_WS2008) { | |
541 | newchannel->is_dedicated_interrupt = | |
542 | (offer->is_dedicated_interrupt != 0); | |
543 | newchannel->sig_event->connectionid.u.id = | |
544 | offer->connection_id; | |
545 | } | |
546 | ||
c50f7fb2 | 547 | memcpy(&newchannel->offermsg, offer, |
bd60c33e | 548 | sizeof(struct vmbus_channel_offer_channel)); |
c50f7fb2 HZ |
549 | newchannel->monitor_grp = (u8)offer->monitorid / 32; |
550 | newchannel->monitor_bit = (u8)offer->monitorid % 32; | |
3e7ee490 | 551 | |
2dd37cb8 | 552 | vmbus_process_offer(newchannel); |
3e7ee490 HJ |
553 | } |
554 | ||
3e189519 | 555 | /* |
e98cb276 | 556 | * vmbus_onoffer_rescind - Rescind offer handler. |
bd60c33e GKH |
557 | * |
558 | * We queue a work item to process this offer synchronously | |
559 | */ | |
e98cb276 | 560 | static void vmbus_onoffer_rescind(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 561 | { |
bd60c33e | 562 | struct vmbus_channel_rescind_offer *rescind; |
aded7165 | 563 | struct vmbus_channel *channel; |
d43e2fe7 DC |
564 | unsigned long flags; |
565 | struct device *dev; | |
3e7ee490 | 566 | |
bd60c33e | 567 | rescind = (struct vmbus_channel_rescind_offer *)hdr; |
d43e2fe7 | 568 | channel = relid2channel(rescind->child_relid); |
98e08702 | 569 | |
2dd37cb8 S |
570 | if (channel == NULL) { |
571 | hv_process_channel_removal(NULL, rescind->child_relid); | |
3e7ee490 | 572 | return; |
2dd37cb8 | 573 | } |
3e7ee490 | 574 | |
d43e2fe7 DC |
575 | spin_lock_irqsave(&channel->lock, flags); |
576 | channel->rescind = true; | |
577 | spin_unlock_irqrestore(&channel->lock, flags); | |
578 | ||
579 | if (channel->device_obj) { | |
580 | /* | |
581 | * We will have to unregister this device from the | |
582 | * driver core. | |
583 | */ | |
584 | dev = get_device(&channel->device_obj->device); | |
585 | if (dev) { | |
586 | vmbus_device_unregister(channel->device_obj); | |
587 | put_device(dev); | |
588 | } | |
589 | } else { | |
590 | hv_process_channel_removal(channel, | |
591 | channel->offermsg.child_relid); | |
2dd37cb8 | 592 | } |
3e7ee490 HJ |
593 | } |
594 | ||
3e189519 | 595 | /* |
e98cb276 HZ |
596 | * vmbus_onoffers_delivered - |
597 | * This is invoked when all offers have been delivered. | |
bd60c33e GKH |
598 | * |
599 | * Nothing to do here. | |
600 | */ | |
e98cb276 | 601 | static void vmbus_onoffers_delivered( |
bd60c33e | 602 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 603 | { |
3e7ee490 HJ |
604 | } |
605 | ||
3e189519 | 606 | /* |
e98cb276 | 607 | * vmbus_onopen_result - Open result handler. |
bd60c33e GKH |
608 | * |
609 | * This is invoked when we received a response to our channel open request. | |
610 | * Find the matching request, copy the response and signal the requesting | |
611 | * thread. | |
612 | */ | |
e98cb276 | 613 | static void vmbus_onopen_result(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 614 | { |
bd60c33e | 615 | struct vmbus_channel_open_result *result; |
188963ec HZ |
616 | struct vmbus_channel_msginfo *msginfo; |
617 | struct vmbus_channel_message_header *requestheader; | |
618 | struct vmbus_channel_open_channel *openmsg; | |
dd0813b6 | 619 | unsigned long flags; |
3e7ee490 | 620 | |
bd60c33e | 621 | result = (struct vmbus_channel_open_result *)hdr; |
3e7ee490 | 622 | |
bd60c33e GKH |
623 | /* |
624 | * Find the open msg, copy the result and signal/unblock the wait event | |
625 | */ | |
15b2f647 | 626 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 627 | |
ebb61e5f HJ |
628 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
629 | msglistentry) { | |
188963ec | 630 | requestheader = |
c50f7fb2 | 631 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 632 | |
c50f7fb2 | 633 | if (requestheader->msgtype == CHANNELMSG_OPENCHANNEL) { |
188963ec | 634 | openmsg = |
c50f7fb2 HZ |
635 | (struct vmbus_channel_open_channel *)msginfo->msg; |
636 | if (openmsg->child_relid == result->child_relid && | |
637 | openmsg->openid == result->openid) { | |
638 | memcpy(&msginfo->response.open_result, | |
bd60c33e | 639 | result, |
9568a193 S |
640 | sizeof( |
641 | struct vmbus_channel_open_result)); | |
642 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
643 | break; |
644 | } | |
645 | } | |
646 | } | |
15b2f647 | 647 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
648 | } |
649 | ||
3e189519 | 650 | /* |
e98cb276 | 651 | * vmbus_ongpadl_created - GPADL created handler. |
bd60c33e GKH |
652 | * |
653 | * This is invoked when we received a response to our gpadl create request. | |
654 | * Find the matching request, copy the response and signal the requesting | |
655 | * thread. | |
656 | */ | |
e98cb276 | 657 | static void vmbus_ongpadl_created(struct vmbus_channel_message_header *hdr) |
3e7ee490 | 658 | { |
188963ec | 659 | struct vmbus_channel_gpadl_created *gpadlcreated; |
188963ec HZ |
660 | struct vmbus_channel_msginfo *msginfo; |
661 | struct vmbus_channel_message_header *requestheader; | |
662 | struct vmbus_channel_gpadl_header *gpadlheader; | |
dd0813b6 | 663 | unsigned long flags; |
3e7ee490 | 664 | |
188963ec | 665 | gpadlcreated = (struct vmbus_channel_gpadl_created *)hdr; |
3e7ee490 | 666 | |
bd60c33e GKH |
667 | /* |
668 | * Find the establish msg, copy the result and signal/unblock the wait | |
669 | * event | |
670 | */ | |
15b2f647 | 671 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 672 | |
ebb61e5f HJ |
673 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
674 | msglistentry) { | |
188963ec | 675 | requestheader = |
c50f7fb2 | 676 | (struct vmbus_channel_message_header *)msginfo->msg; |
188963ec | 677 | |
c50f7fb2 | 678 | if (requestheader->msgtype == CHANNELMSG_GPADL_HEADER) { |
188963ec HZ |
679 | gpadlheader = |
680 | (struct vmbus_channel_gpadl_header *)requestheader; | |
681 | ||
c50f7fb2 HZ |
682 | if ((gpadlcreated->child_relid == |
683 | gpadlheader->child_relid) && | |
684 | (gpadlcreated->gpadl == gpadlheader->gpadl)) { | |
685 | memcpy(&msginfo->response.gpadl_created, | |
188963ec | 686 | gpadlcreated, |
9568a193 S |
687 | sizeof( |
688 | struct vmbus_channel_gpadl_created)); | |
689 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
690 | break; |
691 | } | |
692 | } | |
693 | } | |
15b2f647 | 694 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
695 | } |
696 | ||
3e189519 | 697 | /* |
e98cb276 | 698 | * vmbus_ongpadl_torndown - GPADL torndown handler. |
bd60c33e GKH |
699 | * |
700 | * This is invoked when we received a response to our gpadl teardown request. | |
701 | * Find the matching request, copy the response and signal the requesting | |
702 | * thread. | |
703 | */ | |
e98cb276 | 704 | static void vmbus_ongpadl_torndown( |
bd60c33e | 705 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 706 | { |
188963ec | 707 | struct vmbus_channel_gpadl_torndown *gpadl_torndown; |
188963ec HZ |
708 | struct vmbus_channel_msginfo *msginfo; |
709 | struct vmbus_channel_message_header *requestheader; | |
710 | struct vmbus_channel_gpadl_teardown *gpadl_teardown; | |
dd0813b6 | 711 | unsigned long flags; |
3e7ee490 | 712 | |
188963ec | 713 | gpadl_torndown = (struct vmbus_channel_gpadl_torndown *)hdr; |
bd60c33e GKH |
714 | |
715 | /* | |
716 | * Find the open msg, copy the result and signal/unblock the wait event | |
717 | */ | |
15b2f647 | 718 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 719 | |
ebb61e5f HJ |
720 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
721 | msglistentry) { | |
188963ec | 722 | requestheader = |
c50f7fb2 | 723 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 724 | |
c50f7fb2 | 725 | if (requestheader->msgtype == CHANNELMSG_GPADL_TEARDOWN) { |
188963ec HZ |
726 | gpadl_teardown = |
727 | (struct vmbus_channel_gpadl_teardown *)requestheader; | |
3e7ee490 | 728 | |
c50f7fb2 HZ |
729 | if (gpadl_torndown->gpadl == gpadl_teardown->gpadl) { |
730 | memcpy(&msginfo->response.gpadl_torndown, | |
188963ec | 731 | gpadl_torndown, |
9568a193 S |
732 | sizeof( |
733 | struct vmbus_channel_gpadl_torndown)); | |
734 | complete(&msginfo->waitevent); | |
3e7ee490 HJ |
735 | break; |
736 | } | |
737 | } | |
738 | } | |
15b2f647 | 739 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
740 | } |
741 | ||
3e189519 | 742 | /* |
e98cb276 | 743 | * vmbus_onversion_response - Version response handler |
bd60c33e GKH |
744 | * |
745 | * This is invoked when we received a response to our initiate contact request. | |
746 | * Find the matching request, copy the response and signal the requesting | |
747 | * thread. | |
748 | */ | |
e98cb276 | 749 | static void vmbus_onversion_response( |
bd60c33e | 750 | struct vmbus_channel_message_header *hdr) |
3e7ee490 | 751 | { |
188963ec HZ |
752 | struct vmbus_channel_msginfo *msginfo; |
753 | struct vmbus_channel_message_header *requestheader; | |
188963ec | 754 | struct vmbus_channel_version_response *version_response; |
dd0813b6 | 755 | unsigned long flags; |
3e7ee490 | 756 | |
188963ec | 757 | version_response = (struct vmbus_channel_version_response *)hdr; |
15b2f647 | 758 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 759 | |
ebb61e5f HJ |
760 | list_for_each_entry(msginfo, &vmbus_connection.chn_msg_list, |
761 | msglistentry) { | |
188963ec | 762 | requestheader = |
c50f7fb2 | 763 | (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 764 | |
c50f7fb2 HZ |
765 | if (requestheader->msgtype == |
766 | CHANNELMSG_INITIATE_CONTACT) { | |
c50f7fb2 | 767 | memcpy(&msginfo->response.version_response, |
188963ec | 768 | version_response, |
bd60c33e | 769 | sizeof(struct vmbus_channel_version_response)); |
9568a193 | 770 | complete(&msginfo->waitevent); |
3e7ee490 HJ |
771 | } |
772 | } | |
15b2f647 | 773 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 HJ |
774 | } |
775 | ||
c8212f04 | 776 | /* Channel message dispatch table */ |
652594c7 | 777 | struct vmbus_channel_message_table_entry |
b7c6b02f | 778 | channel_message_table[CHANNELMSG_COUNT] = { |
652594c7 DC |
779 | {CHANNELMSG_INVALID, 0, NULL}, |
780 | {CHANNELMSG_OFFERCHANNEL, 0, vmbus_onoffer}, | |
781 | {CHANNELMSG_RESCIND_CHANNELOFFER, 0, vmbus_onoffer_rescind}, | |
782 | {CHANNELMSG_REQUESTOFFERS, 0, NULL}, | |
783 | {CHANNELMSG_ALLOFFERS_DELIVERED, 1, vmbus_onoffers_delivered}, | |
784 | {CHANNELMSG_OPENCHANNEL, 0, NULL}, | |
785 | {CHANNELMSG_OPENCHANNEL_RESULT, 1, vmbus_onopen_result}, | |
786 | {CHANNELMSG_CLOSECHANNEL, 0, NULL}, | |
787 | {CHANNELMSG_GPADL_HEADER, 0, NULL}, | |
788 | {CHANNELMSG_GPADL_BODY, 0, NULL}, | |
789 | {CHANNELMSG_GPADL_CREATED, 1, vmbus_ongpadl_created}, | |
790 | {CHANNELMSG_GPADL_TEARDOWN, 0, NULL}, | |
791 | {CHANNELMSG_GPADL_TORNDOWN, 1, vmbus_ongpadl_torndown}, | |
792 | {CHANNELMSG_RELID_RELEASED, 0, NULL}, | |
793 | {CHANNELMSG_INITIATE_CONTACT, 0, NULL}, | |
794 | {CHANNELMSG_VERSION_RESPONSE, 1, vmbus_onversion_response}, | |
795 | {CHANNELMSG_UNLOAD, 0, NULL}, | |
2db84eff | 796 | {CHANNELMSG_UNLOAD_RESPONSE, 1, vmbus_unload_response}, |
c8212f04 GKH |
797 | }; |
798 | ||
3e189519 | 799 | /* |
e98cb276 | 800 | * vmbus_onmessage - Handler for channel protocol messages. |
bd60c33e GKH |
801 | * |
802 | * This is invoked in the vmbus worker thread context. | |
803 | */ | |
e98cb276 | 804 | void vmbus_onmessage(void *context) |
3e7ee490 | 805 | { |
188963ec | 806 | struct hv_message *msg = context; |
82250213 | 807 | struct vmbus_channel_message_header *hdr; |
3e7ee490 HJ |
808 | int size; |
809 | ||
f6feebe0 HZ |
810 | hdr = (struct vmbus_channel_message_header *)msg->u.payload; |
811 | size = msg->header.payload_size; | |
3e7ee490 | 812 | |
c50f7fb2 | 813 | if (hdr->msgtype >= CHANNELMSG_COUNT) { |
0a46618d | 814 | pr_err("Received invalid channel message type %d size %d\n", |
c50f7fb2 | 815 | hdr->msgtype, size); |
04f50c4d | 816 | print_hex_dump_bytes("", DUMP_PREFIX_NONE, |
f6feebe0 | 817 | (unsigned char *)msg->u.payload, size); |
3e7ee490 HJ |
818 | return; |
819 | } | |
820 | ||
b7c6b02f S |
821 | if (channel_message_table[hdr->msgtype].message_handler) |
822 | channel_message_table[hdr->msgtype].message_handler(hdr); | |
3e7ee490 | 823 | else |
0a46618d | 824 | pr_err("Unhandled channel message type %d\n", hdr->msgtype); |
3e7ee490 HJ |
825 | } |
826 | ||
3e189519 | 827 | /* |
e98cb276 | 828 | * vmbus_request_offers - Send a request to get all our pending offers. |
bd60c33e | 829 | */ |
e98cb276 | 830 | int vmbus_request_offers(void) |
3e7ee490 | 831 | { |
82250213 | 832 | struct vmbus_channel_message_header *msg; |
188963ec | 833 | struct vmbus_channel_msginfo *msginfo; |
51e5181d | 834 | int ret; |
3e7ee490 | 835 | |
188963ec | 836 | msginfo = kmalloc(sizeof(*msginfo) + |
bd60c33e GKH |
837 | sizeof(struct vmbus_channel_message_header), |
838 | GFP_KERNEL); | |
188963ec | 839 | if (!msginfo) |
75910f23 | 840 | return -ENOMEM; |
3e7ee490 | 841 | |
c50f7fb2 | 842 | msg = (struct vmbus_channel_message_header *)msginfo->msg; |
3e7ee490 | 843 | |
c50f7fb2 | 844 | msg->msgtype = CHANNELMSG_REQUESTOFFERS; |
3e7ee490 | 845 | |
3e7ee490 | 846 | |
c6977677 | 847 | ret = vmbus_post_msg(msg, |
bd60c33e GKH |
848 | sizeof(struct vmbus_channel_message_header)); |
849 | if (ret != 0) { | |
0a46618d | 850 | pr_err("Unable to request offers - %d\n", ret); |
3e7ee490 | 851 | |
0c3b7b2f S |
852 | goto cleanup; |
853 | } | |
3e7ee490 | 854 | |
0c3b7b2f | 855 | cleanup: |
dd9b15dc | 856 | kfree(msginfo); |
3e7ee490 | 857 | |
3e7ee490 HJ |
858 | return ret; |
859 | } | |
860 | ||
e68d2971 S |
861 | /* |
862 | * Retrieve the (sub) channel on which to send an outgoing request. | |
a13e8bbe S |
863 | * When a primary channel has multiple sub-channels, we try to |
864 | * distribute the load equally amongst all available channels. | |
e68d2971 S |
865 | */ |
866 | struct vmbus_channel *vmbus_get_outgoing_channel(struct vmbus_channel *primary) | |
867 | { | |
868 | struct list_head *cur, *tmp; | |
87712bf8 | 869 | int cur_cpu; |
e68d2971 S |
870 | struct vmbus_channel *cur_channel; |
871 | struct vmbus_channel *outgoing_channel = primary; | |
a13e8bbe S |
872 | int next_channel; |
873 | int i = 1; | |
e68d2971 S |
874 | |
875 | if (list_empty(&primary->sc_list)) | |
876 | return outgoing_channel; | |
877 | ||
a13e8bbe S |
878 | next_channel = primary->next_oc++; |
879 | ||
880 | if (next_channel > (primary->num_sc)) { | |
881 | primary->next_oc = 0; | |
882 | return outgoing_channel; | |
883 | } | |
884 | ||
87712bf8 S |
885 | cur_cpu = hv_context.vp_index[get_cpu()]; |
886 | put_cpu(); | |
e68d2971 S |
887 | list_for_each_safe(cur, tmp, &primary->sc_list) { |
888 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
889 | if (cur_channel->state != CHANNEL_OPENED_STATE) | |
890 | continue; | |
891 | ||
892 | if (cur_channel->target_vp == cur_cpu) | |
893 | return cur_channel; | |
894 | ||
a13e8bbe S |
895 | if (i == next_channel) |
896 | return cur_channel; | |
e68d2971 | 897 | |
a13e8bbe | 898 | i++; |
e68d2971 S |
899 | } |
900 | ||
901 | return outgoing_channel; | |
902 | } | |
903 | EXPORT_SYMBOL_GPL(vmbus_get_outgoing_channel); | |
904 | ||
905 | static void invoke_sc_cb(struct vmbus_channel *primary_channel) | |
906 | { | |
907 | struct list_head *cur, *tmp; | |
908 | struct vmbus_channel *cur_channel; | |
909 | ||
910 | if (primary_channel->sc_creation_callback == NULL) | |
911 | return; | |
912 | ||
913 | list_for_each_safe(cur, tmp, &primary_channel->sc_list) { | |
914 | cur_channel = list_entry(cur, struct vmbus_channel, sc_list); | |
915 | ||
916 | primary_channel->sc_creation_callback(cur_channel); | |
917 | } | |
918 | } | |
919 | ||
920 | void vmbus_set_sc_create_callback(struct vmbus_channel *primary_channel, | |
921 | void (*sc_cr_cb)(struct vmbus_channel *new_sc)) | |
922 | { | |
923 | primary_channel->sc_creation_callback = sc_cr_cb; | |
924 | } | |
925 | EXPORT_SYMBOL_GPL(vmbus_set_sc_create_callback); | |
926 | ||
927 | bool vmbus_are_subchannels_present(struct vmbus_channel *primary) | |
928 | { | |
929 | bool ret; | |
930 | ||
931 | ret = !list_empty(&primary->sc_list); | |
932 | ||
933 | if (ret) { | |
934 | /* | |
935 | * Invoke the callback on sub-channel creation. | |
936 | * This will present a uniform interface to the | |
937 | * clients. | |
938 | */ | |
939 | invoke_sc_cb(primary); | |
940 | } | |
941 | ||
942 | return ret; | |
943 | } | |
944 | EXPORT_SYMBOL_GPL(vmbus_are_subchannels_present); |