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 | ||
454f18a9 | 36 | /* Internal routines */ |
fff41b2e | 37 | static int create_gpadl_header( |
39d70a4a HZ |
38 | void *kbuffer, /* must be phys and virt contiguous */ |
39 | u32 size, /* page-size multiple */ | |
40 | struct vmbus_channel_msginfo **msginfo, | |
41 | u32 *messagecount); | |
fff41b2e | 42 | static void vmbus_setevent(struct vmbus_channel *channel); |
3e7ee490 | 43 | |
3e189519 | 44 | /* |
fff41b2e | 45 | * vmbus_setevent- Trigger an event notification on the specified |
3e189519 | 46 | * channel. |
f4266e34 | 47 | */ |
fff41b2e | 48 | static void vmbus_setevent(struct vmbus_channel *channel) |
3e7ee490 | 49 | { |
39d70a4a | 50 | struct hv_monitor_page *monitorpage; |
3e7ee490 | 51 | |
c50f7fb2 | 52 | if (channel->offermsg.monitor_allocated) { |
454f18a9 | 53 | /* Each u32 represents 32 channels */ |
22356585 | 54 | sync_set_bit(channel->offermsg.child_relid & 31, |
da9fcb72 | 55 | (unsigned long *) vmbus_connection.send_int_page + |
c50f7fb2 | 56 | (channel->offermsg.child_relid >> 5)); |
3e7ee490 | 57 | |
da9fcb72 | 58 | monitorpage = vmbus_connection.monitor_pages; |
39d70a4a | 59 | monitorpage++; /* Get the child to parent monitor page */ |
3e7ee490 | 60 | |
22356585 | 61 | sync_set_bit(channel->monitor_bit, |
f6feebe0 HZ |
62 | (unsigned long *)&monitorpage->trigger_group |
63 | [channel->monitor_grp].pending); | |
7c369f40 | 64 | |
f4266e34 | 65 | } else { |
c6977677 | 66 | vmbus_set_event(channel->offermsg.child_relid); |
3e7ee490 | 67 | } |
3e7ee490 HJ |
68 | } |
69 | ||
3e189519 | 70 | /* |
fff41b2e | 71 | * vmbus_get_debug_info -Retrieve various channel debug info |
f4266e34 | 72 | */ |
fff41b2e | 73 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
39d70a4a | 74 | struct vmbus_channel_debug_info *debuginfo) |
3e7ee490 | 75 | { |
39d70a4a | 76 | struct hv_monitor_page *monitorpage; |
c50f7fb2 HZ |
77 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
78 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; | |
3e7ee490 | 79 | |
c50f7fb2 HZ |
80 | debuginfo->relid = channel->offermsg.child_relid; |
81 | debuginfo->state = channel->state; | |
82 | memcpy(&debuginfo->interfacetype, | |
358d2ee2 | 83 | &channel->offermsg.offer.if_type, sizeof(uuid_le)); |
c50f7fb2 | 84 | memcpy(&debuginfo->interface_instance, |
767dff68 | 85 | &channel->offermsg.offer.if_instance, |
358d2ee2 | 86 | sizeof(uuid_le)); |
3e7ee490 | 87 | |
da9fcb72 | 88 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 89 | |
c50f7fb2 | 90 | debuginfo->monitorid = channel->offermsg.monitorid; |
3e7ee490 | 91 | |
c50f7fb2 | 92 | debuginfo->servermonitor_pending = |
f6feebe0 | 93 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 94 | debuginfo->servermonitor_latency = |
f6feebe0 | 95 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 96 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
97 | monitorpage->parameter[monitor_group] |
98 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 99 | |
39d70a4a | 100 | monitorpage++; |
3e7ee490 | 101 | |
c50f7fb2 | 102 | debuginfo->clientmonitor_pending = |
f6feebe0 | 103 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 104 | debuginfo->clientmonitor_latency = |
f6feebe0 | 105 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 106 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
107 | monitorpage->parameter[monitor_group] |
108 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 109 | |
a75b61d5 S |
110 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
111 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
112 | } |
113 | ||
3e189519 | 114 | /* |
fff41b2e | 115 | * vmbus_open - Open the specified channel. |
f4266e34 | 116 | */ |
fff41b2e | 117 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
118 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
119 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 120 | { |
0987ff69 | 121 | struct vmbus_channel_open_channel *open_msg; |
176fb9e3 | 122 | struct vmbus_channel_msginfo *open_info = NULL; |
3e7ee490 | 123 | void *in, *out; |
dd0813b6 | 124 | unsigned long flags; |
9568a193 | 125 | int ret, t, err = 0; |
3e7ee490 | 126 | |
c50f7fb2 HZ |
127 | newchannel->onchannel_callback = onchannelcallback; |
128 | newchannel->channel_callback_context = context; | |
3e7ee490 | 129 | |
454f18a9 | 130 | /* Allocate the ring buffer */ |
df3493e0 S |
131 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
132 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
133 | ||
7e052d98 BP |
134 | if (!out) |
135 | return -ENOMEM; | |
136 | ||
3e7ee490 | 137 | |
39d70a4a | 138 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 139 | |
c50f7fb2 HZ |
140 | newchannel->ringbuffer_pages = out; |
141 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 142 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 143 | |
72a95cbc S |
144 | ret = hv_ringbuffer_init( |
145 | &newchannel->outbound, out, send_ringbuffer_size); | |
146 | ||
fd4dc88e | 147 | if (ret != 0) { |
3324fb40 BP |
148 | err = ret; |
149 | goto errorout; | |
150 | } | |
151 | ||
72a95cbc S |
152 | ret = hv_ringbuffer_init( |
153 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 154 | if (ret != 0) { |
3324fb40 BP |
155 | err = ret; |
156 | goto errorout; | |
157 | } | |
3e7ee490 | 158 | |
3e7ee490 | 159 | |
454f18a9 | 160 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 161 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 162 | |
fff41b2e | 163 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 164 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
165 | send_ringbuffer_size + |
166 | recv_ringbuffer_size, | |
c50f7fb2 | 167 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 168 | |
fd4dc88e | 169 | if (ret != 0) { |
b94ef345 BP |
170 | err = ret; |
171 | goto errorout; | |
172 | } | |
f4266e34 | 173 | |
454f18a9 | 174 | /* Create and init the channel open message */ |
176fb9e3 | 175 | open_info = kmalloc(sizeof(*open_info) + |
f4266e34 GKH |
176 | sizeof(struct vmbus_channel_open_channel), |
177 | GFP_KERNEL); | |
176fb9e3 | 178 | if (!open_info) { |
c3bf2e26 BP |
179 | err = -ENOMEM; |
180 | goto errorout; | |
181 | } | |
3e7ee490 | 182 | |
176fb9e3 | 183 | init_completion(&open_info->waitevent); |
3e7ee490 | 184 | |
176fb9e3 | 185 | open_msg = (struct vmbus_channel_open_channel *)open_info->msg; |
0987ff69 S |
186 | open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
187 | open_msg->openid = newchannel->offermsg.child_relid; | |
188 | open_msg->child_relid = newchannel->offermsg.child_relid; | |
189 | open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
190 | open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 191 | PAGE_SHIFT; |
0987ff69 | 192 | open_msg->server_contextarea_gpadlhandle = 0; |
3e7ee490 | 193 | |
39d70a4a | 194 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 BP |
195 | err = -EINVAL; |
196 | goto errorout; | |
197 | } | |
198 | ||
39d70a4a | 199 | if (userdatalen) |
0987ff69 | 200 | memcpy(open_msg->userdata, userdata, userdatalen); |
3e7ee490 | 201 | |
15b2f647 | 202 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 203 | list_add_tail(&open_info->msglistentry, |
da9fcb72 | 204 | &vmbus_connection.chn_msg_list); |
15b2f647 | 205 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 206 | |
0987ff69 | 207 | ret = vmbus_post_msg(open_msg, |
f4266e34 | 208 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
209 | |
210 | if (ret != 0) | |
00d760b0 | 211 | goto cleanup; |
3e7ee490 | 212 | |
176fb9e3 | 213 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 214 | if (t == 0) { |
0c3b7b2f S |
215 | err = -ETIMEDOUT; |
216 | goto errorout; | |
217 | } | |
218 | ||
3e7ee490 | 219 | |
176fb9e3 S |
220 | if (open_info->response.open_result.status) |
221 | err = open_info->response.open_result.status; | |
3e7ee490 | 222 | |
00d760b0 | 223 | cleanup: |
15b2f647 | 224 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 225 | list_del(&open_info->msglistentry); |
15b2f647 | 226 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 227 | |
176fb9e3 | 228 | kfree(open_info); |
98e08702 | 229 | return err; |
c3bf2e26 BP |
230 | |
231 | errorout: | |
2dba688b S |
232 | hv_ringbuffer_cleanup(&newchannel->outbound); |
233 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
df3493e0 S |
234 | free_pages((unsigned long)out, |
235 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 236 | kfree(open_info); |
c3bf2e26 | 237 | return err; |
3e7ee490 | 238 | } |
36ceadfc | 239 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 240 | |
3e189519 | 241 | /* |
fff41b2e | 242 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 243 | */ |
fff41b2e | 244 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
245 | struct vmbus_channel_msginfo **msginfo, |
246 | u32 *messagecount) | |
3e7ee490 HJ |
247 | { |
248 | int i; | |
39d70a4a | 249 | int pagecount; |
f4266e34 | 250 | unsigned long long pfn; |
39d70a4a HZ |
251 | struct vmbus_channel_gpadl_header *gpadl_header; |
252 | struct vmbus_channel_gpadl_body *gpadl_body; | |
253 | struct vmbus_channel_msginfo *msgheader; | |
254 | struct vmbus_channel_msginfo *msgbody = NULL; | |
255 | u32 msgsize; | |
3e7ee490 | 256 | |
39d70a4a | 257 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 258 | |
39d70a4a HZ |
259 | pagecount = size >> PAGE_SHIFT; |
260 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 261 | |
454f18a9 | 262 | /* do we need a gpadl body msg */ |
39d70a4a | 263 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
264 | sizeof(struct vmbus_channel_gpadl_header) - |
265 | sizeof(struct gpa_range); | |
39d70a4a | 266 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 267 | |
39d70a4a | 268 | if (pagecount > pfncount) { |
f4266e34 | 269 | /* we need a gpadl body */ |
454f18a9 | 270 | /* fill in the header */ |
39d70a4a | 271 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 272 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
273 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
274 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
275 | if (!msgheader) | |
d1c250bb | 276 | goto nomem; |
3e7ee490 | 277 | |
c50f7fb2 HZ |
278 | INIT_LIST_HEAD(&msgheader->submsglist); |
279 | msgheader->msgsize = msgsize; | |
3e7ee490 | 280 | |
39d70a4a | 281 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
282 | msgheader->msg; |
283 | gpadl_header->rangecount = 1; | |
284 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 285 | pagecount * sizeof(u64); |
415f2287 HZ |
286 | gpadl_header->range[0].byte_offset = 0; |
287 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 288 | for (i = 0; i < pfncount; i++) |
415f2287 | 289 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
290 | *msginfo = msgheader; |
291 | *messagecount = 1; | |
3e7ee490 | 292 | |
39d70a4a HZ |
293 | pfnsum = pfncount; |
294 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 295 | |
454f18a9 | 296 | /* how many pfns can we fit */ |
39d70a4a | 297 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 298 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 299 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 300 | |
454f18a9 | 301 | /* fill in the body */ |
39d70a4a HZ |
302 | while (pfnleft) { |
303 | if (pfnleft > pfncount) | |
304 | pfncurr = pfncount; | |
3e7ee490 | 305 | else |
39d70a4a | 306 | pfncurr = pfnleft; |
3e7ee490 | 307 | |
39d70a4a | 308 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 309 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
310 | pfncurr * sizeof(u64); |
311 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
312 | |
313 | if (!msgbody) { | |
314 | struct vmbus_channel_msginfo *pos = NULL; | |
315 | struct vmbus_channel_msginfo *tmp = NULL; | |
316 | /* | |
317 | * Free up all the allocated messages. | |
318 | */ | |
319 | list_for_each_entry_safe(pos, tmp, | |
320 | &msgheader->submsglist, | |
321 | msglistentry) { | |
322 | ||
323 | list_del(&pos->msglistentry); | |
324 | kfree(pos); | |
325 | } | |
326 | ||
d1c250bb | 327 | goto nomem; |
f38cf9cc S |
328 | } |
329 | ||
c50f7fb2 | 330 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
331 | (*messagecount)++; |
332 | gpadl_body = | |
c50f7fb2 | 333 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
334 | |
335 | /* | |
f4266e34 GKH |
336 | * Gpadl is u32 and we are using a pointer which could |
337 | * be 64-bit | |
f27df643 S |
338 | * This is governed by the guest/host protocol and |
339 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 340 | */ |
39d70a4a | 341 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 342 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 343 | |
454f18a9 | 344 | /* add to msg header */ |
c50f7fb2 HZ |
345 | list_add_tail(&msgbody->msglistentry, |
346 | &msgheader->submsglist); | |
39d70a4a HZ |
347 | pfnsum += pfncurr; |
348 | pfnleft -= pfncurr; | |
3e7ee490 | 349 | } |
f4266e34 | 350 | } else { |
454f18a9 | 351 | /* everything fits in a header */ |
39d70a4a | 352 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 353 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
354 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
355 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
356 | if (msgheader == NULL) | |
e3eb7cdd | 357 | goto nomem; |
c50f7fb2 | 358 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
359 | |
360 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
361 | msgheader->msg; |
362 | gpadl_header->rangecount = 1; | |
363 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 364 | pagecount * sizeof(u64); |
415f2287 HZ |
365 | gpadl_header->range[0].byte_offset = 0; |
366 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 367 | for (i = 0; i < pagecount; i++) |
415f2287 | 368 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
369 | |
370 | *msginfo = msgheader; | |
371 | *messagecount = 1; | |
3e7ee490 HJ |
372 | } |
373 | ||
374 | return 0; | |
d1c250bb | 375 | nomem: |
39d70a4a HZ |
376 | kfree(msgheader); |
377 | kfree(msgbody); | |
d1c250bb | 378 | return -ENOMEM; |
3e7ee490 HJ |
379 | } |
380 | ||
3e189519 | 381 | /* |
fff41b2e | 382 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 383 | * |
39d70a4a HZ |
384 | * @channel: a channel |
385 | * @kbuffer: from kmalloc | |
386 | * @size: page-size multiple | |
387 | * @gpadl_handle: some funky thing | |
f4266e34 | 388 | */ |
fff41b2e | 389 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 390 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 391 | { |
39d70a4a HZ |
392 | struct vmbus_channel_gpadl_header *gpadlmsg; |
393 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
394 | struct vmbus_channel_msginfo *msginfo = NULL; |
395 | struct vmbus_channel_msginfo *submsginfo; | |
396 | u32 msgcount; | |
53af545b | 397 | struct list_head *curr; |
39d70a4a | 398 | u32 next_gpadl_handle; |
dd0813b6 | 399 | unsigned long flags; |
c3bf2e26 | 400 | int ret = 0; |
9568a193 | 401 | int t; |
3e7ee490 | 402 | |
da9fcb72 HZ |
403 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
404 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 405 | |
fff41b2e | 406 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
407 | if (ret) |
408 | return ret; | |
3e7ee490 | 409 | |
9568a193 | 410 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 411 | |
c50f7fb2 HZ |
412 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
413 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
414 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
415 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 416 | |
3e7ee490 | 417 | |
15b2f647 | 418 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 419 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 420 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 421 | |
15b2f647 | 422 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 423 | |
c6977677 | 424 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 425 | sizeof(*msginfo)); |
98e08702 | 426 | if (ret != 0) |
00d760b0 | 427 | goto cleanup; |
3e7ee490 | 428 | |
39d70a4a | 429 | if (msgcount > 1) { |
c50f7fb2 | 430 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 431 | |
39d70a4a HZ |
432 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
433 | gpadl_body = | |
c50f7fb2 | 434 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 435 | |
c50f7fb2 HZ |
436 | gpadl_body->header.msgtype = |
437 | CHANNELMSG_GPADL_BODY; | |
438 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 439 | |
c6977677 | 440 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 441 | submsginfo->msgsize - |
39d70a4a | 442 | sizeof(*submsginfo)); |
fd4dc88e | 443 | if (ret != 0) |
00d760b0 | 444 | goto cleanup; |
99259159 | 445 | |
3e7ee490 HJ |
446 | } |
447 | } | |
40961de3 | 448 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 449 | BUG_ON(t == 0); |
0c3b7b2f | 450 | |
3e7ee490 | 451 | |
454f18a9 | 452 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 453 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 454 | |
00d760b0 | 455 | cleanup: |
15b2f647 | 456 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 457 | list_del(&msginfo->msglistentry); |
15b2f647 | 458 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 459 | |
39d70a4a | 460 | kfree(msginfo); |
3e7ee490 HJ |
461 | return ret; |
462 | } | |
98873724 | 463 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 464 | |
3e189519 | 465 | /* |
fff41b2e | 466 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 467 | */ |
fff41b2e | 468 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 469 | { |
82250213 | 470 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 471 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 472 | unsigned long flags; |
9568a193 | 473 | int ret, t; |
3e7ee490 | 474 | |
f4266e34 GKH |
475 | info = kmalloc(sizeof(*info) + |
476 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
477 | if (!info) |
478 | return -ENOMEM; | |
3e7ee490 | 479 | |
9568a193 | 480 | init_completion(&info->waitevent); |
3e7ee490 | 481 | |
c50f7fb2 | 482 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 483 | |
c50f7fb2 HZ |
484 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
485 | msg->child_relid = channel->offermsg.child_relid; | |
486 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 487 | |
15b2f647 | 488 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 489 | list_add_tail(&info->msglistentry, |
da9fcb72 | 490 | &vmbus_connection.chn_msg_list); |
15b2f647 | 491 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 492 | ret = vmbus_post_msg(msg, |
f4266e34 | 493 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 494 | |
0c3b7b2f | 495 | BUG_ON(ret != 0); |
40961de3 | 496 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 497 | BUG_ON(t == 0); |
3e7ee490 | 498 | |
454f18a9 | 499 | /* Received a torndown response */ |
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; |
3e7ee490 | 573 | |
3e7ee490 | 574 | |
454f18a9 | 575 | /* Setup the descriptor */ |
415f2287 HZ |
576 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
577 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 578 | /* in 8-bytes granularity */ |
415f2287 HZ |
579 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
580 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
581 | desc.trans_id = requestid; | |
3e7ee490 | 582 | |
39d70a4a HZ |
583 | sg_init_table(bufferlist, 3); |
584 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
585 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
586 | sg_set_buf(&bufferlist[2], &aligned_data, | |
587 | packetlen_aligned - packetlen); | |
3e7ee490 | 588 | |
633c4dce | 589 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 590 | |
decc49da | 591 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 592 | vmbus_setevent(channel); |
3e7ee490 | 593 | |
3e7ee490 HJ |
594 | return ret; |
595 | } | |
fff41b2e | 596 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 597 | |
3e189519 | 598 | /* |
fff41b2e | 599 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 600 | * packets using a GPADL Direct packet type. |
f4266e34 | 601 | */ |
fff41b2e | 602 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
603 | struct hv_page_buffer pagebuffers[], |
604 | u32 pagecount, void *buffer, u32 bufferlen, | |
605 | u64 requestid) | |
3e7ee490 | 606 | { |
f4266e34 GKH |
607 | int ret; |
608 | int i; | |
430a8e9a | 609 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
610 | u32 descsize; |
611 | u32 packetlen; | |
612 | u32 packetlen_aligned; | |
613 | struct scatterlist bufferlist[3]; | |
614 | u64 aligned_data = 0; | |
3e7ee490 | 615 | |
39d70a4a | 616 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 617 | return -EINVAL; |
3e7ee490 | 618 | |
3e7ee490 | 619 | |
f4266e34 | 620 | /* |
430a8e9a | 621 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
622 | * largest size we support |
623 | */ | |
39d70a4a HZ |
624 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
625 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 626 | sizeof(struct hv_page_buffer)); |
39d70a4a | 627 | packetlen = descsize + bufferlen; |
73509681 | 628 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 629 | |
454f18a9 | 630 | /* Setup the descriptor */ |
415f2287 | 631 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 632 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
633 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
634 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
635 | desc.transactionid = requestid; | |
636 | desc.rangecount = pagecount; | |
637 | ||
638 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
639 | desc.range[i].len = pagebuffers[i].len; |
640 | desc.range[i].offset = pagebuffers[i].offset; | |
641 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
642 | } |
643 | ||
39d70a4a HZ |
644 | sg_init_table(bufferlist, 3); |
645 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
646 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
647 | sg_set_buf(&bufferlist[2], &aligned_data, | |
648 | packetlen_aligned - packetlen); | |
3e7ee490 | 649 | |
633c4dce | 650 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 651 | |
decc49da | 652 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 653 | vmbus_setevent(channel); |
3e7ee490 | 654 | |
3e7ee490 HJ |
655 | return ret; |
656 | } | |
713efeb4 | 657 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 658 | |
3e189519 | 659 | /* |
fff41b2e | 660 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 661 | * using a GPADL Direct packet type. |
f4266e34 | 662 | */ |
fff41b2e | 663 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
664 | struct hv_multipage_buffer *multi_pagebuffer, |
665 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 666 | { |
f4266e34 | 667 | int ret; |
430a8e9a | 668 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
669 | u32 descsize; |
670 | u32 packetlen; | |
671 | u32 packetlen_aligned; | |
672 | struct scatterlist bufferlist[3]; | |
673 | u64 aligned_data = 0; | |
ca623ad3 HZ |
674 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
675 | multi_pagebuffer->len); | |
3e7ee490 | 676 | |
3e7ee490 | 677 | |
39d70a4a | 678 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 679 | return -EINVAL; |
3e7ee490 | 680 | |
f4266e34 | 681 | /* |
430a8e9a | 682 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
683 | * the largest size we support |
684 | */ | |
39d70a4a HZ |
685 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
686 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 687 | sizeof(u64)); |
39d70a4a | 688 | packetlen = descsize + bufferlen; |
73509681 | 689 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 690 | |
3e7ee490 | 691 | |
454f18a9 | 692 | /* Setup the descriptor */ |
415f2287 | 693 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 694 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
695 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
696 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
697 | desc.transactionid = requestid; | |
430a8e9a | 698 | desc.rangecount = 1; |
3e7ee490 | 699 | |
ca623ad3 HZ |
700 | desc.range.len = multi_pagebuffer->len; |
701 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 702 | |
ca623ad3 | 703 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 704 | pfncount * sizeof(u64)); |
3e7ee490 | 705 | |
39d70a4a HZ |
706 | sg_init_table(bufferlist, 3); |
707 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
708 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
709 | sg_set_buf(&bufferlist[2], &aligned_data, | |
710 | packetlen_aligned - packetlen); | |
3e7ee490 | 711 | |
633c4dce | 712 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 713 | |
decc49da | 714 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 715 | vmbus_setevent(channel); |
3e7ee490 | 716 | |
3e7ee490 HJ |
717 | return ret; |
718 | } | |
4cb106fa | 719 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
720 | |
721 | /** | |
fff41b2e | 722 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
723 | * @channel: Pointer to vmbus_channel structure. |
724 | * @buffer: Pointer to the buffer you want to receive the data into. | |
725 | * @bufferlen: Maximum size of what the the buffer will hold | |
726 | * @buffer_actual_len: The actual size of the data after it was received | |
727 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
728 | * |
729 | * Receives directly from the hyper-v vmbus and puts the data it received | |
730 | * into Buffer. This will receive the data unparsed from hyper-v. | |
731 | * | |
732 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 733 | */ |
fff41b2e | 734 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 735 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 736 | { |
8dc0a06a | 737 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
738 | u32 packetlen; |
739 | u32 userlen; | |
3e7ee490 HJ |
740 | int ret; |
741 | ||
39d70a4a HZ |
742 | *buffer_actual_len = 0; |
743 | *requestid = 0; | |
3e7ee490 | 744 | |
3e7ee490 | 745 | |
a89186c2 | 746 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 747 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 748 | if (ret != 0) |
3e7ee490 | 749 | return 0; |
3e7ee490 | 750 | |
415f2287 HZ |
751 | packetlen = desc.len8 << 3; |
752 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 753 | |
39d70a4a | 754 | *buffer_actual_len = userlen; |
3e7ee490 | 755 | |
39d70a4a | 756 | if (userlen > bufferlen) { |
3e7ee490 | 757 | |
0a46618d | 758 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 759 | bufferlen, userlen); |
926ae526 | 760 | return -ETOOSMALL; |
3e7ee490 HJ |
761 | } |
762 | ||
415f2287 | 763 | *requestid = desc.trans_id; |
3e7ee490 | 764 | |
454f18a9 | 765 | /* Copy over the packet to the user buffer */ |
38397c8a | 766 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 767 | (desc.offset8 << 3)); |
3e7ee490 | 768 | |
3e7ee490 | 769 | |
3e7ee490 HJ |
770 | return 0; |
771 | } | |
fff41b2e | 772 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 773 | |
3e189519 | 774 | /* |
fff41b2e | 775 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 776 | */ |
fff41b2e | 777 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
778 | u32 bufferlen, u32 *buffer_actual_len, |
779 | u64 *requestid) | |
3e7ee490 | 780 | { |
8dc0a06a | 781 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
782 | u32 packetlen; |
783 | u32 userlen; | |
3e7ee490 HJ |
784 | int ret; |
785 | ||
39d70a4a HZ |
786 | *buffer_actual_len = 0; |
787 | *requestid = 0; | |
3e7ee490 | 788 | |
3e7ee490 | 789 | |
a89186c2 | 790 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 791 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 792 | if (ret != 0) |
3e7ee490 | 793 | return 0; |
3e7ee490 | 794 | |
3e7ee490 | 795 | |
415f2287 HZ |
796 | packetlen = desc.len8 << 3; |
797 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 798 | |
39d70a4a | 799 | *buffer_actual_len = packetlen; |
3e7ee490 | 800 | |
39d70a4a | 801 | if (packetlen > bufferlen) { |
0a46618d HJ |
802 | pr_err("Buffer too small - needed %d bytes but " |
803 | "got space for only %d bytes\n", | |
804 | packetlen, bufferlen); | |
3d5cad97 | 805 | return -ENOBUFS; |
3e7ee490 HJ |
806 | } |
807 | ||
415f2287 | 808 | *requestid = desc.trans_id; |
3e7ee490 | 809 | |
454f18a9 | 810 | /* Copy over the entire packet to the user buffer */ |
38397c8a | 811 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 812 | |
3e7ee490 HJ |
813 | return 0; |
814 | } | |
adaee6bd | 815 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |