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 | ||
5654e932 | 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> |
c88c4e4c | 28 | #include <linux/module.h> |
46a97191 | 29 | #include <linux/hyperv.h> |
3f335ea2 | 30 | |
0f2a6619 | 31 | #include "hyperv_vmbus.h" |
3e7ee490 | 32 | |
e3fe0bb6 S |
33 | #define NUM_PAGES_SPANNED(addr, len) \ |
34 | ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) | |
35 | ||
3e189519 | 36 | /* |
fff41b2e | 37 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 38 | * channel. |
f4266e34 | 39 | */ |
fff41b2e | 40 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 41 | { |
39d70a4a | 42 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 43 | |
c50f7fb2 | 44 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 45 | /* Each u32 represents 32 channels */ |
22356585 | 46 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 47 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 48 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 49 | |
da9fcb72 | 50 | monitorpage = vmbus_connection.monitor_pages; |
39d70a4a | 51 | monitorpage++; /* Get the child to parent monitor page */ |
3e7ee490 | 52 | |
22356585 | 53 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
54 | (unsigned long *)&monitorpage->trigger_group |
55 | [channel->monitor_grp].pending); | |
7c369f40 | 56 | |
f4266e34 | 57 | } else { |
21c3bef5 | 58 | vmbus_set_event(channel); |
3e7ee490 | 59 | } |
3e7ee490 HJ |
60 | } |
61 | ||
3e189519 | 62 | /* |
fff41b2e | 63 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 64 | */ |
fff41b2e | 65 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 66 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 67 | { |
39d70a4a | 68 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
69 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
70 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
3e7ee490 | 71 | |
c50f7fb2 HZ |
72 | debuginfo->relid = channel->offermsg.child_relid; |
73 | debuginfo->state = channel->state; | |
74 | memcpy(&debuginfo->interfacetype, | |
358d2ee2 | 75 | &channel->offermsg.offer.if_type, sizeof(uuid_le)); |
c50f7fb2 | 76 | memcpy(&debuginfo->interface_instance, |
767dff68 | 77 | &channel->offermsg.offer.if_instance, |
358d2ee2 | 78 | sizeof(uuid_le)); |
3e7ee490 | 79 | |
da9fcb72 | 80 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 81 | |
c50f7fb2 | 82 | debuginfo->monitorid = channel->offermsg.monitorid; |
3e7ee490 | 83 | |
c50f7fb2 | 84 | debuginfo->servermonitor_pending = |
f6feebe0 | 85 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 86 | debuginfo->servermonitor_latency = |
f6feebe0 | 87 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 88 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
89 | monitorpage->parameter[monitor_group] |
90 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 91 | |
39d70a4a | 92 | monitorpage++; |
3e7ee490 | 93 | |
c50f7fb2 | 94 | debuginfo->clientmonitor_pending = |
f6feebe0 | 95 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 96 | debuginfo->clientmonitor_latency = |
f6feebe0 | 97 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 98 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
99 | monitorpage->parameter[monitor_group] |
100 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 101 | |
a75b61d5 S |
102 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
103 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
104 | } |
105 | ||
3e189519 | 106 | /* |
fff41b2e | 107 | * vmbus_open - Open the specified channel. |
f4266e34 | 108 | */ |
fff41b2e | 109 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
110 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
111 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 112 | { |
0987ff69 | 113 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 114 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 115 | void *in, *out; |
dd0813b6 | 116 | unsigned long flags; |
0854b58f | 117 | int ret, err = 0; |
3e7ee490 | 118 | |
c50f7fb2 HZ |
119 | newchannel->onchannel_callback = onchannelcallback; |
120 | newchannel->channel_callback_context = context; | |
3e7ee490 | 121 | |
454f18a9 | 122 | /* Allocate the ring buffer */ |
df3493e0 S |
123 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
124 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
125 | ||
7e052d98 BP |
126 | if (!out) |
127 | return -ENOMEM; | |
128 | ||
3e7ee490 | 129 | |
39d70a4a | 130 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 131 | |
c50f7fb2 HZ |
132 | newchannel->ringbuffer_pages = out; |
133 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 134 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 135 | |
72a95cbc S |
136 | ret = hv_ringbuffer_init( |
137 | &newchannel->outbound, out, send_ringbuffer_size); | |
138 | ||
fd4dc88e | 139 | if (ret != 0) { |
3324fb40 | 140 | err = ret; |
13925502 | 141 | goto error0; |
3324fb40 BP |
142 | } |
143 | ||
72a95cbc S |
144 | ret = hv_ringbuffer_init( |
145 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 146 | if (ret != 0) { |
3324fb40 | 147 | err = ret; |
13925502 | 148 | goto error0; |
3324fb40 | 149 | } |
3e7ee490 | 150 | |
3e7ee490 | 151 | |
454f18a9 | 152 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 153 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 154 | |
fff41b2e | 155 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 156 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
157 | send_ringbuffer_size + |
158 | recv_ringbuffer_size, | |
c50f7fb2 | 159 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 160 | |
fd4dc88e | 161 | if (ret != 0) { |
b94ef345 | 162 | err = ret; |
13925502 | 163 | goto error0; |
b94ef345 | 164 | } |
f4266e34 | 165 | |
454f18a9 | 166 | /* Create and init the channel open message */ |
176fb9e3 | 167 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
168 | sizeof(struct vmbus_channel_open_channel), |
169 | GFP_KERNEL); | |
176fb9e3 | 170 | if (!open_info) { |
c3bf2e26 | 171 | err = -ENOMEM; |
b020a467 | 172 | goto error_gpadl; |
c3bf2e26 | 173 | } |
3e7ee490 | 174 | |
176fb9e3 | 175 | init_completion(&open_info->waitevent); |
3e7ee490 | 176 | |
176fb9e3 | 177 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
178 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
179 | open_msg->openid = newchannel->offermsg.child_relid; | |
180 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
181 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
182 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 183 | PAGE_SHIFT; |
abbf3b2a | 184 | open_msg->target_vp = newchannel->target_vp; |
3e7ee490 | 185 | |
39d70a4a | 186 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 | 187 | err = -EINVAL; |
b020a467 | 188 | goto error_gpadl; |
c827f944 BP |
189 | } |
190 | ||
39d70a4a | 191 | if (userdatalen) |
0987ff69 | 192 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 193 | |
15b2f647 | 194 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 195 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 196 | &vmbus_connection.chn_msg_list); |
15b2f647 | 197 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 198 | |
0987ff69 | 199 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 200 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 | 201 | |
bd617482 S |
202 | if (ret != 0) { |
203 | err = ret; | |
13925502 | 204 | goto error1; |
bd617482 | 205 | } |
3e7ee490 | 206 | |
0854b58f | 207 | wait_for_completion(&open_info->waitevent); |
0c3b7b2f | 208 | |
3e7ee490 | 209 | |
176fb9e3 S |
210 | if (open_info->response.open_result.status) |
211 | err = open_info->response.open_result.status; | |
3e7ee490 | 212 | |
15b2f647 | 213 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 214 | list_del(&open_info->msglistentry); |
15b2f647 | 215 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 216 | |
176fb9e3 | 217 | kfree(open_info); |
98e08702 | 218 | return err; |
c3bf2e26 | 219 | |
13925502 S |
220 | error1: |
221 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
222 | list_del(&open_info->msglistentry); | |
223 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
224 | ||
b020a467 S |
225 | error_gpadl: |
226 | vmbus_teardown_gpadl(newchannel, newchannel->ringbuffer_gpadlhandle); | |
227 | ||
13925502 | 228 | error0: |
df3493e0 S |
229 | free_pages((unsigned long)out, |
230 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 231 | kfree(open_info); |
c3bf2e26 | 232 | return err; |
3e7ee490 | 233 | } |
36ceadfc | 234 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 235 | |
3e189519 | 236 | /* |
fff41b2e | 237 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 238 | */ |
fff41b2e | 239 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
240 | struct vmbus_channel_msginfo **msginfo, |
241 | u32 *messagecount) | |
3e7ee490 HJ |
242 | { |
243 | int i; | |
39d70a4a | 244 | int pagecount; |
f4266e34 | 245 | unsigned long long pfn; |
39d70a4a HZ |
246 | struct vmbus_channel_gpadl_header *gpadl_header; |
247 | struct vmbus_channel_gpadl_body *gpadl_body; | |
248 | struct vmbus_channel_msginfo *msgheader; | |
249 | struct vmbus_channel_msginfo *msgbody = NULL; | |
250 | u32 msgsize; | |
3e7ee490 | 251 | |
39d70a4a | 252 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 253 | |
39d70a4a HZ |
254 | pagecount = size >> PAGE_SHIFT; |
255 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 256 | |
454f18a9 | 257 | /* do we need a gpadl body msg */ |
39d70a4a | 258 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
259 | sizeof(struct vmbus_channel_gpadl_header) - |
260 | sizeof(struct gpa_range); | |
39d70a4a | 261 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 262 | |
39d70a4a | 263 | if (pagecount > pfncount) { |
f4266e34 | 264 | /* we need a gpadl body */ |
454f18a9 | 265 | /* fill in the header */ |
39d70a4a | 266 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 267 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
268 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
269 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
270 | if (!msgheader) | |
d1c250bb | 271 | goto nomem; |
3e7ee490 | 272 | |
c50f7fb2 HZ |
273 | INIT_LIST_HEAD(&msgheader->submsglist); |
274 | msgheader->msgsize = msgsize; | |
3e7ee490 | 275 | |
39d70a4a | 276 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
277 | msgheader->msg; |
278 | gpadl_header->rangecount = 1; | |
279 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 280 | pagecount * sizeof(u64); |
415f2287 HZ |
281 | gpadl_header->range[0].byte_offset = 0; |
282 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 283 | for (i = 0; i < pfncount; i++) |
415f2287 | 284 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
285 | *msginfo = msgheader; |
286 | *messagecount = 1; | |
3e7ee490 | 287 | |
39d70a4a HZ |
288 | pfnsum = pfncount; |
289 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 290 | |
454f18a9 | 291 | /* how many pfns can we fit */ |
39d70a4a | 292 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 293 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 294 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 295 | |
454f18a9 | 296 | /* fill in the body */ |
39d70a4a HZ |
297 | while (pfnleft) { |
298 | if (pfnleft > pfncount) | |
299 | pfncurr = pfncount; | |
3e7ee490 | 300 | else |
39d70a4a | 301 | pfncurr = pfnleft; |
3e7ee490 | 302 | |
39d70a4a | 303 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 304 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
305 | pfncurr * sizeof(u64); |
306 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
307 | |
308 | if (!msgbody) { | |
309 | struct vmbus_channel_msginfo *pos = NULL; | |
310 | struct vmbus_channel_msginfo *tmp = NULL; | |
311 | /* | |
312 | * Free up all the allocated messages. | |
313 | */ | |
314 | list_for_each_entry_safe(pos, tmp, | |
315 | &msgheader->submsglist, | |
316 | msglistentry) { | |
317 | ||
318 | list_del(&pos->msglistentry); | |
319 | kfree(pos); | |
320 | } | |
321 | ||
d1c250bb | 322 | goto nomem; |
f38cf9cc S |
323 | } |
324 | ||
c50f7fb2 | 325 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
326 | (*messagecount)++; |
327 | gpadl_body = | |
c50f7fb2 | 328 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
329 | |
330 | /* | |
f4266e34 GKH |
331 | * Gpadl is u32 and we are using a pointer which could |
332 | * be 64-bit | |
f27df643 S |
333 | * This is governed by the guest/host protocol and |
334 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 335 | */ |
39d70a4a | 336 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 337 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 338 | |
454f18a9 | 339 | /* add to msg header */ |
c50f7fb2 HZ |
340 | list_add_tail(&msgbody->msglistentry, |
341 | &msgheader->submsglist); | |
39d70a4a HZ |
342 | pfnsum += pfncurr; |
343 | pfnleft -= pfncurr; | |
3e7ee490 | 344 | } |
f4266e34 | 345 | } else { |
454f18a9 | 346 | /* everything fits in a header */ |
39d70a4a | 347 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 348 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
349 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
350 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
351 | if (msgheader == NULL) | |
e3eb7cdd | 352 | goto nomem; |
c50f7fb2 | 353 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
354 | |
355 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
356 | msgheader->msg; |
357 | gpadl_header->rangecount = 1; | |
358 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 359 | pagecount * sizeof(u64); |
415f2287 HZ |
360 | gpadl_header->range[0].byte_offset = 0; |
361 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 362 | for (i = 0; i < pagecount; i++) |
415f2287 | 363 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
364 | |
365 | *msginfo = msgheader; | |
366 | *messagecount = 1; | |
3e7ee490 HJ |
367 | } |
368 | ||
369 | return 0; | |
d1c250bb | 370 | nomem: |
39d70a4a HZ |
371 | kfree(msgheader); |
372 | kfree(msgbody); | |
d1c250bb | 373 | return -ENOMEM; |
3e7ee490 HJ |
374 | } |
375 | ||
3e189519 | 376 | /* |
fff41b2e | 377 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 378 | * |
39d70a4a HZ |
379 | * @channel: a channel |
380 | * @kbuffer: from kmalloc | |
381 | * @size: page-size multiple | |
382 | * @gpadl_handle: some funky thing | |
f4266e34 | 383 | */ |
fff41b2e | 384 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 385 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 386 | { |
39d70a4a HZ |
387 | struct vmbus_channel_gpadl_header *gpadlmsg; |
388 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a | 389 | struct vmbus_channel_msginfo *msginfo = NULL; |
0c792ee1 | 390 | struct vmbus_channel_msginfo *submsginfo, *tmp; |
39d70a4a | 391 | u32 msgcount; |
53af545b | 392 | struct list_head *curr; |
39d70a4a | 393 | u32 next_gpadl_handle; |
dd0813b6 | 394 | unsigned long flags; |
c3bf2e26 | 395 | int ret = 0; |
3e7ee490 | 396 | |
da9fcb72 HZ |
397 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
398 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 399 | |
fff41b2e | 400 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
401 | if (ret) |
402 | return ret; | |
3e7ee490 | 403 | |
9568a193 | 404 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 405 | |
c50f7fb2 HZ |
406 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
407 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
408 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
409 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 410 | |
3e7ee490 | 411 | |
15b2f647 | 412 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 413 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 414 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 415 | |
15b2f647 | 416 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 417 | |
c6977677 | 418 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 419 | sizeof(*msginfo)); |
98e08702 | 420 | if (ret != 0) |
00d760b0 | 421 | goto cleanup; |
3e7ee490 | 422 | |
39d70a4a | 423 | if (msgcount > 1) { |
c50f7fb2 | 424 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 425 | |
39d70a4a HZ |
426 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
427 | gpadl_body = | |
c50f7fb2 | 428 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 429 | |
c50f7fb2 HZ |
430 | gpadl_body->header.msgtype = |
431 | CHANNELMSG_GPADL_BODY; | |
432 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 433 | |
c6977677 | 434 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 435 | submsginfo->msgsize - |
39d70a4a | 436 | sizeof(*submsginfo)); |
fd4dc88e | 437 | if (ret != 0) |
00d760b0 | 438 | goto cleanup; |
99259159 | 439 | |
3e7ee490 HJ |
440 | } |
441 | } | |
b5e03dd7 | 442 | wait_for_completion(&msginfo->waitevent); |
3e7ee490 | 443 | |
454f18a9 | 444 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 445 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 446 | |
00d760b0 | 447 | cleanup: |
15b2f647 | 448 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 449 | list_del(&msginfo->msglistentry); |
15b2f647 | 450 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 451 | |
0c792ee1 VK |
452 | if (msgcount > 1) { |
453 | list_for_each_entry_safe(submsginfo, tmp, &msginfo->submsglist, | |
454 | msglistentry) { | |
455 | kfree(submsginfo); | |
456 | } | |
457 | } | |
458 | ||
39d70a4a | 459 | kfree(msginfo); |
3e7ee490 HJ |
460 | return ret; |
461 | } | |
98873724 | 462 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 463 | |
3e189519 | 464 | /* |
fff41b2e | 465 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 466 | */ |
fff41b2e | 467 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 468 | { |
82250213 | 469 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 470 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 471 | unsigned long flags; |
a443461e | 472 | int ret; |
3e7ee490 | 473 | |
f4266e34 GKH |
474 | info = kmalloc(sizeof(*info) + |
475 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
476 | if (!info) |
477 | return -ENOMEM; | |
3e7ee490 | 478 | |
9568a193 | 479 | init_completion(&info->waitevent); |
3e7ee490 | 480 | |
c50f7fb2 | 481 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 482 | |
c50f7fb2 HZ |
483 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
484 | msg->child_relid = channel->offermsg.child_relid; | |
485 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 486 | |
15b2f647 | 487 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 488 | list_add_tail(&info->msglistentry, |
da9fcb72 | 489 | &vmbus_connection.chn_msg_list); |
15b2f647 | 490 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 491 | ret = vmbus_post_msg(msg, |
f4266e34 | 492 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 493 | |
a443461e S |
494 | if (ret) |
495 | goto post_msg_err; | |
496 | ||
497 | wait_for_completion(&info->waitevent); | |
3e7ee490 | 498 | |
a443461e | 499 | post_msg_err: |
15b2f647 | 500 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 501 | list_del(&info->msglistentry); |
15b2f647 | 502 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 503 | |
8c69f52a | 504 | kfree(info); |
3e7ee490 HJ |
505 | return ret; |
506 | } | |
18726d7a | 507 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 508 | |
3e189519 | 509 | /* |
fff41b2e | 510 | * vmbus_close - Close the specified channel |
f4266e34 | 511 | */ |
fff41b2e | 512 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 513 | { |
82250213 | 514 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 515 | int ret; |
dad76bf7 | 516 | unsigned long flags; |
3e7ee490 | 517 | |
454f18a9 | 518 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 519 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 520 | channel->onchannel_callback = NULL; |
dad76bf7 | 521 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 522 | |
454f18a9 | 523 | /* Send a closing message */ |
3e7ee490 | 524 | |
e9a27a9f | 525 | msg = &channel->close_msg.msg; |
3e7ee490 | 526 | |
c50f7fb2 HZ |
527 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
528 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 529 | |
c6977677 | 530 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 531 | |
0c3b7b2f | 532 | BUG_ON(ret != 0); |
454f18a9 | 533 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 534 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 535 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 536 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 537 | |
454f18a9 | 538 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
539 | hv_ringbuffer_cleanup(&channel->outbound); |
540 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 541 | |
df3493e0 S |
542 | free_pages((unsigned long)channel->ringbuffer_pages, |
543 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 544 | |
3e7ee490 | 545 | |
3e7ee490 | 546 | } |
70bfa307 | 547 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 548 | |
c88c4e4c | 549 | /** |
fff41b2e | 550 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
551 | * @channel: Pointer to vmbus_channel structure. |
552 | * @buffer: Pointer to the buffer you want to receive the data into. | |
553 | * @bufferlen: Maximum size of what the the buffer will hold | |
554 | * @requestid: Identifier of the request | |
555 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
556 | * packet etc. |
557 | * | |
39d70a4a | 558 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
559 | * This will send the data unparsed to hyper-v. |
560 | * | |
561 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 562 | */ |
fff41b2e | 563 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
564 | u32 bufferlen, u64 requestid, |
565 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 566 | { |
8dc0a06a | 567 | struct vmpacket_descriptor desc; |
39d70a4a | 568 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 569 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
570 | struct scatterlist bufferlist[3]; |
571 | u64 aligned_data = 0; | |
f4266e34 | 572 | int ret; |
98fa8cf4 | 573 | bool signal = false; |
3e7ee490 | 574 | |
3e7ee490 | 575 | |
454f18a9 | 576 | /* Setup the descriptor */ |
415f2287 HZ |
577 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
578 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 579 | /* in 8-bytes granularity */ |
415f2287 HZ |
580 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
581 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
582 | desc.trans_id = requestid; | |
3e7ee490 | 583 | |
39d70a4a HZ |
584 | sg_init_table(bufferlist, 3); |
585 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
586 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
587 | sg_set_buf(&bufferlist[2], &aligned_data, | |
588 | packetlen_aligned - packetlen); | |
3e7ee490 | 589 | |
98fa8cf4 | 590 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 591 | |
98fa8cf4 | 592 | if (ret == 0 && signal) |
fff41b2e | 593 | vmbus_setevent(channel); |
3e7ee490 | 594 | |
3e7ee490 HJ |
595 | return ret; |
596 | } | |
fff41b2e | 597 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 598 | |
3e189519 | 599 | /* |
fff41b2e | 600 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 601 | * packets using a GPADL Direct packet type. |
f4266e34 | 602 | */ |
fff41b2e | 603 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
604 | struct hv_page_buffer pagebuffers[], |
605 | u32 pagecount, void *buffer, u32 bufferlen, | |
606 | u64 requestid) | |
3e7ee490 | 607 | { |
f4266e34 GKH |
608 | int ret; |
609 | int i; | |
430a8e9a | 610 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
611 | u32 descsize; |
612 | u32 packetlen; | |
613 | u32 packetlen_aligned; | |
614 | struct scatterlist bufferlist[3]; | |
615 | u64 aligned_data = 0; | |
98fa8cf4 | 616 | bool signal = false; |
3e7ee490 | 617 | |
39d70a4a | 618 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 619 | return -EINVAL; |
3e7ee490 | 620 | |
3e7ee490 | 621 | |
f4266e34 | 622 | /* |
430a8e9a | 623 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
624 | * largest size we support |
625 | */ | |
39d70a4a HZ |
626 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
627 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 628 | sizeof(struct hv_page_buffer)); |
39d70a4a | 629 | packetlen = descsize + bufferlen; |
73509681 | 630 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 631 | |
454f18a9 | 632 | /* Setup the descriptor */ |
415f2287 | 633 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 634 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
635 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
636 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
637 | desc.transactionid = requestid; | |
638 | desc.rangecount = pagecount; | |
639 | ||
640 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
641 | desc.range[i].len = pagebuffers[i].len; |
642 | desc.range[i].offset = pagebuffers[i].offset; | |
643 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
644 | } |
645 | ||
39d70a4a HZ |
646 | sg_init_table(bufferlist, 3); |
647 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
648 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
649 | sg_set_buf(&bufferlist[2], &aligned_data, | |
650 | packetlen_aligned - packetlen); | |
3e7ee490 | 651 | |
98fa8cf4 | 652 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 653 | |
98fa8cf4 | 654 | if (ret == 0 && signal) |
fff41b2e | 655 | vmbus_setevent(channel); |
3e7ee490 | 656 | |
3e7ee490 HJ |
657 | return ret; |
658 | } | |
713efeb4 | 659 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 660 | |
3e189519 | 661 | /* |
fff41b2e | 662 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 663 | * using a GPADL Direct packet type. |
f4266e34 | 664 | */ |
fff41b2e | 665 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
666 | struct hv_multipage_buffer *multi_pagebuffer, |
667 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 668 | { |
f4266e34 | 669 | int ret; |
430a8e9a | 670 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
671 | u32 descsize; |
672 | u32 packetlen; | |
673 | u32 packetlen_aligned; | |
674 | struct scatterlist bufferlist[3]; | |
675 | u64 aligned_data = 0; | |
98fa8cf4 | 676 | bool signal = false; |
ca623ad3 HZ |
677 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
678 | multi_pagebuffer->len); | |
3e7ee490 | 679 | |
3e7ee490 | 680 | |
39d70a4a | 681 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 682 | return -EINVAL; |
3e7ee490 | 683 | |
f4266e34 | 684 | /* |
430a8e9a | 685 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
686 | * the largest size we support |
687 | */ | |
39d70a4a HZ |
688 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
689 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 690 | sizeof(u64)); |
39d70a4a | 691 | packetlen = descsize + bufferlen; |
73509681 | 692 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 693 | |
3e7ee490 | 694 | |
454f18a9 | 695 | /* Setup the descriptor */ |
415f2287 | 696 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 697 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
698 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
699 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
700 | desc.transactionid = requestid; | |
430a8e9a | 701 | desc.rangecount = 1; |
3e7ee490 | 702 | |
ca623ad3 HZ |
703 | desc.range.len = multi_pagebuffer->len; |
704 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 705 | |
ca623ad3 | 706 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 707 | pfncount * sizeof(u64)); |
3e7ee490 | 708 | |
39d70a4a HZ |
709 | sg_init_table(bufferlist, 3); |
710 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
711 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
712 | sg_set_buf(&bufferlist[2], &aligned_data, | |
713 | packetlen_aligned - packetlen); | |
3e7ee490 | 714 | |
98fa8cf4 | 715 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); |
3e7ee490 | 716 | |
98fa8cf4 | 717 | if (ret == 0 && signal) |
fff41b2e | 718 | vmbus_setevent(channel); |
3e7ee490 | 719 | |
3e7ee490 HJ |
720 | return ret; |
721 | } | |
4cb106fa | 722 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
723 | |
724 | /** | |
fff41b2e | 725 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
726 | * @channel: Pointer to vmbus_channel structure. |
727 | * @buffer: Pointer to the buffer you want to receive the data into. | |
728 | * @bufferlen: Maximum size of what the the buffer will hold | |
729 | * @buffer_actual_len: The actual size of the data after it was received | |
730 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
731 | * |
732 | * Receives directly from the hyper-v vmbus and puts the data it received | |
733 | * into Buffer. This will receive the data unparsed from hyper-v. | |
734 | * | |
735 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 736 | */ |
fff41b2e | 737 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 738 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 739 | { |
8dc0a06a | 740 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
741 | u32 packetlen; |
742 | u32 userlen; | |
3e7ee490 | 743 | int ret; |
c2b8e520 | 744 | bool signal = false; |
3e7ee490 | 745 | |
39d70a4a HZ |
746 | *buffer_actual_len = 0; |
747 | *requestid = 0; | |
3e7ee490 | 748 | |
3e7ee490 | 749 | |
a89186c2 | 750 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 751 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 752 | if (ret != 0) |
3e7ee490 | 753 | return 0; |
3e7ee490 | 754 | |
415f2287 HZ |
755 | packetlen = desc.len8 << 3; |
756 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 757 | |
39d70a4a | 758 | *buffer_actual_len = userlen; |
3e7ee490 | 759 | |
39d70a4a | 760 | if (userlen > bufferlen) { |
3e7ee490 | 761 | |
0a46618d | 762 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 763 | bufferlen, userlen); |
926ae526 | 764 | return -ETOOSMALL; |
3e7ee490 HJ |
765 | } |
766 | ||
415f2287 | 767 | *requestid = desc.trans_id; |
3e7ee490 | 768 | |
454f18a9 | 769 | /* Copy over the packet to the user buffer */ |
38397c8a | 770 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
c2b8e520 | 771 | (desc.offset8 << 3), &signal); |
3e7ee490 | 772 | |
c2b8e520 S |
773 | if (signal) |
774 | vmbus_setevent(channel); | |
3e7ee490 | 775 | |
3e7ee490 HJ |
776 | return 0; |
777 | } | |
fff41b2e | 778 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 779 | |
3e189519 | 780 | /* |
fff41b2e | 781 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 782 | */ |
fff41b2e | 783 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
784 | u32 bufferlen, u32 *buffer_actual_len, |
785 | u64 *requestid) | |
3e7ee490 | 786 | { |
8dc0a06a | 787 | struct vmpacket_descriptor desc; |
39d70a4a | 788 | u32 packetlen; |
3e7ee490 | 789 | int ret; |
c2b8e520 | 790 | bool signal = false; |
3e7ee490 | 791 | |
39d70a4a HZ |
792 | *buffer_actual_len = 0; |
793 | *requestid = 0; | |
3e7ee490 | 794 | |
3e7ee490 | 795 | |
a89186c2 | 796 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 797 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 798 | if (ret != 0) |
3e7ee490 | 799 | return 0; |
3e7ee490 | 800 | |
3e7ee490 | 801 | |
415f2287 | 802 | packetlen = desc.len8 << 3; |
3e7ee490 | 803 | |
39d70a4a | 804 | *buffer_actual_len = packetlen; |
3e7ee490 | 805 | |
39d70a4a | 806 | if (packetlen > bufferlen) { |
0a46618d HJ |
807 | pr_err("Buffer too small - needed %d bytes but " |
808 | "got space for only %d bytes\n", | |
809 | packetlen, bufferlen); | |
3d5cad97 | 810 | return -ENOBUFS; |
3e7ee490 HJ |
811 | } |
812 | ||
415f2287 | 813 | *requestid = desc.trans_id; |
3e7ee490 | 814 | |
454f18a9 | 815 | /* Copy over the entire packet to the user buffer */ |
c2b8e520 S |
816 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, |
817 | &signal); | |
818 | ||
819 | if (signal) | |
820 | vmbus_setevent(channel); | |
3e7ee490 | 821 | |
3e7ee490 HJ |
822 | return 0; |
823 | } | |
adaee6bd | 824 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |