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 | 148 | err = ret; |
13925502 | 149 | goto error0; |
3324fb40 BP |
150 | } |
151 | ||
72a95cbc S |
152 | ret = hv_ringbuffer_init( |
153 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 154 | if (ret != 0) { |
3324fb40 | 155 | err = ret; |
13925502 | 156 | goto error0; |
3324fb40 | 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 | 170 | err = ret; |
13925502 | 171 | goto error0; |
b94ef345 | 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 | 179 | err = -ENOMEM; |
13925502 | 180 | goto error0; |
c3bf2e26 | 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 | 195 | err = -EINVAL; |
13925502 | 196 | goto error0; |
c827f944 BP |
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) | |
13925502 | 211 | goto error1; |
3e7ee490 | 212 | |
176fb9e3 | 213 | t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); |
9568a193 | 214 | if (t == 0) { |
0c3b7b2f | 215 | err = -ETIMEDOUT; |
13925502 | 216 | goto error1; |
0c3b7b2f S |
217 | } |
218 | ||
3e7ee490 | 219 | |
176fb9e3 S |
220 | if (open_info->response.open_result.status) |
221 | err = open_info->response.open_result.status; | |
3e7ee490 | 222 | |
15b2f647 | 223 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
176fb9e3 | 224 | list_del(&open_info->msglistentry); |
15b2f647 | 225 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 226 | |
176fb9e3 | 227 | kfree(open_info); |
98e08702 | 228 | return err; |
c3bf2e26 | 229 | |
13925502 S |
230 | error1: |
231 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); | |
232 | list_del(&open_info->msglistentry); | |
233 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); | |
234 | ||
235 | error0: | |
df3493e0 S |
236 | free_pages((unsigned long)out, |
237 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
176fb9e3 | 238 | kfree(open_info); |
c3bf2e26 | 239 | return err; |
3e7ee490 | 240 | } |
36ceadfc | 241 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 242 | |
3e189519 | 243 | /* |
fff41b2e | 244 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 245 | */ |
fff41b2e | 246 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
247 | struct vmbus_channel_msginfo **msginfo, |
248 | u32 *messagecount) | |
3e7ee490 HJ |
249 | { |
250 | int i; | |
39d70a4a | 251 | int pagecount; |
f4266e34 | 252 | unsigned long long pfn; |
39d70a4a HZ |
253 | struct vmbus_channel_gpadl_header *gpadl_header; |
254 | struct vmbus_channel_gpadl_body *gpadl_body; | |
255 | struct vmbus_channel_msginfo *msgheader; | |
256 | struct vmbus_channel_msginfo *msgbody = NULL; | |
257 | u32 msgsize; | |
3e7ee490 | 258 | |
39d70a4a | 259 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 260 | |
39d70a4a HZ |
261 | pagecount = size >> PAGE_SHIFT; |
262 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 263 | |
454f18a9 | 264 | /* do we need a gpadl body msg */ |
39d70a4a | 265 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
266 | sizeof(struct vmbus_channel_gpadl_header) - |
267 | sizeof(struct gpa_range); | |
39d70a4a | 268 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 269 | |
39d70a4a | 270 | if (pagecount > pfncount) { |
f4266e34 | 271 | /* we need a gpadl body */ |
454f18a9 | 272 | /* fill in the header */ |
39d70a4a | 273 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 274 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
275 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
276 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
277 | if (!msgheader) | |
d1c250bb | 278 | goto nomem; |
3e7ee490 | 279 | |
c50f7fb2 HZ |
280 | INIT_LIST_HEAD(&msgheader->submsglist); |
281 | msgheader->msgsize = msgsize; | |
3e7ee490 | 282 | |
39d70a4a | 283 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
284 | msgheader->msg; |
285 | gpadl_header->rangecount = 1; | |
286 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 287 | pagecount * sizeof(u64); |
415f2287 HZ |
288 | gpadl_header->range[0].byte_offset = 0; |
289 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 290 | for (i = 0; i < pfncount; i++) |
415f2287 | 291 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
292 | *msginfo = msgheader; |
293 | *messagecount = 1; | |
3e7ee490 | 294 | |
39d70a4a HZ |
295 | pfnsum = pfncount; |
296 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 297 | |
454f18a9 | 298 | /* how many pfns can we fit */ |
39d70a4a | 299 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 300 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 301 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 302 | |
454f18a9 | 303 | /* fill in the body */ |
39d70a4a HZ |
304 | while (pfnleft) { |
305 | if (pfnleft > pfncount) | |
306 | pfncurr = pfncount; | |
3e7ee490 | 307 | else |
39d70a4a | 308 | pfncurr = pfnleft; |
3e7ee490 | 309 | |
39d70a4a | 310 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 311 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
312 | pfncurr * sizeof(u64); |
313 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
314 | |
315 | if (!msgbody) { | |
316 | struct vmbus_channel_msginfo *pos = NULL; | |
317 | struct vmbus_channel_msginfo *tmp = NULL; | |
318 | /* | |
319 | * Free up all the allocated messages. | |
320 | */ | |
321 | list_for_each_entry_safe(pos, tmp, | |
322 | &msgheader->submsglist, | |
323 | msglistentry) { | |
324 | ||
325 | list_del(&pos->msglistentry); | |
326 | kfree(pos); | |
327 | } | |
328 | ||
d1c250bb | 329 | goto nomem; |
f38cf9cc S |
330 | } |
331 | ||
c50f7fb2 | 332 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
333 | (*messagecount)++; |
334 | gpadl_body = | |
c50f7fb2 | 335 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
336 | |
337 | /* | |
f4266e34 GKH |
338 | * Gpadl is u32 and we are using a pointer which could |
339 | * be 64-bit | |
f27df643 S |
340 | * This is governed by the guest/host protocol and |
341 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 342 | */ |
39d70a4a | 343 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 344 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 345 | |
454f18a9 | 346 | /* add to msg header */ |
c50f7fb2 HZ |
347 | list_add_tail(&msgbody->msglistentry, |
348 | &msgheader->submsglist); | |
39d70a4a HZ |
349 | pfnsum += pfncurr; |
350 | pfnleft -= pfncurr; | |
3e7ee490 | 351 | } |
f4266e34 | 352 | } else { |
454f18a9 | 353 | /* everything fits in a header */ |
39d70a4a | 354 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 355 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
356 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
357 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
358 | if (msgheader == NULL) | |
e3eb7cdd | 359 | goto nomem; |
c50f7fb2 | 360 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
361 | |
362 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
363 | msgheader->msg; |
364 | gpadl_header->rangecount = 1; | |
365 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 366 | pagecount * sizeof(u64); |
415f2287 HZ |
367 | gpadl_header->range[0].byte_offset = 0; |
368 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 369 | for (i = 0; i < pagecount; i++) |
415f2287 | 370 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
371 | |
372 | *msginfo = msgheader; | |
373 | *messagecount = 1; | |
3e7ee490 HJ |
374 | } |
375 | ||
376 | return 0; | |
d1c250bb | 377 | nomem: |
39d70a4a HZ |
378 | kfree(msgheader); |
379 | kfree(msgbody); | |
d1c250bb | 380 | return -ENOMEM; |
3e7ee490 HJ |
381 | } |
382 | ||
3e189519 | 383 | /* |
fff41b2e | 384 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 385 | * |
39d70a4a HZ |
386 | * @channel: a channel |
387 | * @kbuffer: from kmalloc | |
388 | * @size: page-size multiple | |
389 | * @gpadl_handle: some funky thing | |
f4266e34 | 390 | */ |
fff41b2e | 391 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 392 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 393 | { |
39d70a4a HZ |
394 | struct vmbus_channel_gpadl_header *gpadlmsg; |
395 | struct vmbus_channel_gpadl_body *gpadl_body; | |
39d70a4a HZ |
396 | struct vmbus_channel_msginfo *msginfo = NULL; |
397 | struct vmbus_channel_msginfo *submsginfo; | |
398 | u32 msgcount; | |
53af545b | 399 | struct list_head *curr; |
39d70a4a | 400 | u32 next_gpadl_handle; |
dd0813b6 | 401 | unsigned long flags; |
c3bf2e26 | 402 | int ret = 0; |
9568a193 | 403 | int t; |
3e7ee490 | 404 | |
da9fcb72 HZ |
405 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
406 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 407 | |
fff41b2e | 408 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
409 | if (ret) |
410 | return ret; | |
3e7ee490 | 411 | |
9568a193 | 412 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 413 | |
c50f7fb2 HZ |
414 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
415 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
416 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
417 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 418 | |
3e7ee490 | 419 | |
15b2f647 | 420 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 421 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 422 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 423 | |
15b2f647 | 424 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 425 | |
c6977677 | 426 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 427 | sizeof(*msginfo)); |
98e08702 | 428 | if (ret != 0) |
00d760b0 | 429 | goto cleanup; |
3e7ee490 | 430 | |
39d70a4a | 431 | if (msgcount > 1) { |
c50f7fb2 | 432 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 433 | |
39d70a4a HZ |
434 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
435 | gpadl_body = | |
c50f7fb2 | 436 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 437 | |
c50f7fb2 HZ |
438 | gpadl_body->header.msgtype = |
439 | CHANNELMSG_GPADL_BODY; | |
440 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 441 | |
c6977677 | 442 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 443 | submsginfo->msgsize - |
39d70a4a | 444 | sizeof(*submsginfo)); |
fd4dc88e | 445 | if (ret != 0) |
00d760b0 | 446 | goto cleanup; |
99259159 | 447 | |
3e7ee490 HJ |
448 | } |
449 | } | |
40961de3 | 450 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 451 | BUG_ON(t == 0); |
0c3b7b2f | 452 | |
3e7ee490 | 453 | |
454f18a9 | 454 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 455 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 456 | |
00d760b0 | 457 | cleanup: |
15b2f647 | 458 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 459 | list_del(&msginfo->msglistentry); |
15b2f647 | 460 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 461 | |
39d70a4a | 462 | kfree(msginfo); |
3e7ee490 HJ |
463 | return ret; |
464 | } | |
98873724 | 465 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 466 | |
3e189519 | 467 | /* |
fff41b2e | 468 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 469 | */ |
fff41b2e | 470 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 471 | { |
82250213 | 472 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 473 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 474 | unsigned long flags; |
9568a193 | 475 | int ret, t; |
3e7ee490 | 476 | |
f4266e34 GKH |
477 | info = kmalloc(sizeof(*info) + |
478 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
479 | if (!info) |
480 | return -ENOMEM; | |
3e7ee490 | 481 | |
9568a193 | 482 | init_completion(&info->waitevent); |
3e7ee490 | 483 | |
c50f7fb2 | 484 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 485 | |
c50f7fb2 HZ |
486 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
487 | msg->child_relid = channel->offermsg.child_relid; | |
488 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 489 | |
15b2f647 | 490 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 491 | list_add_tail(&info->msglistentry, |
da9fcb72 | 492 | &vmbus_connection.chn_msg_list); |
15b2f647 | 493 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 494 | ret = vmbus_post_msg(msg, |
f4266e34 | 495 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 496 | |
0c3b7b2f | 497 | BUG_ON(ret != 0); |
40961de3 | 498 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 499 | BUG_ON(t == 0); |
3e7ee490 | 500 | |
454f18a9 | 501 | /* Received a torndown response */ |
15b2f647 | 502 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 503 | list_del(&info->msglistentry); |
15b2f647 | 504 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 505 | |
8c69f52a | 506 | kfree(info); |
3e7ee490 HJ |
507 | return ret; |
508 | } | |
18726d7a | 509 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 510 | |
3e189519 | 511 | /* |
fff41b2e | 512 | * vmbus_close - Close the specified channel |
f4266e34 | 513 | */ |
fff41b2e | 514 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 515 | { |
82250213 | 516 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 517 | int ret; |
dad76bf7 | 518 | unsigned long flags; |
3e7ee490 | 519 | |
454f18a9 | 520 | /* Stop callback and cancel the timer asap */ |
dad76bf7 | 521 | spin_lock_irqsave(&channel->inbound_lock, flags); |
c50f7fb2 | 522 | channel->onchannel_callback = NULL; |
dad76bf7 | 523 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 524 | |
454f18a9 | 525 | /* Send a closing message */ |
3e7ee490 | 526 | |
e9a27a9f | 527 | msg = &channel->close_msg.msg; |
3e7ee490 | 528 | |
c50f7fb2 HZ |
529 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
530 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 531 | |
c6977677 | 532 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 533 | |
0c3b7b2f | 534 | BUG_ON(ret != 0); |
454f18a9 | 535 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 536 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 537 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 538 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 539 | |
454f18a9 | 540 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
541 | hv_ringbuffer_cleanup(&channel->outbound); |
542 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 543 | |
df3493e0 S |
544 | free_pages((unsigned long)channel->ringbuffer_pages, |
545 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 546 | |
3e7ee490 | 547 | |
3e7ee490 | 548 | } |
70bfa307 | 549 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 550 | |
c88c4e4c | 551 | /** |
fff41b2e | 552 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
553 | * @channel: Pointer to vmbus_channel structure. |
554 | * @buffer: Pointer to the buffer you want to receive the data into. | |
555 | * @bufferlen: Maximum size of what the the buffer will hold | |
556 | * @requestid: Identifier of the request | |
557 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
558 | * packet etc. |
559 | * | |
39d70a4a | 560 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
561 | * This will send the data unparsed to hyper-v. |
562 | * | |
563 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 564 | */ |
fff41b2e | 565 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
566 | u32 bufferlen, u64 requestid, |
567 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 568 | { |
8dc0a06a | 569 | struct vmpacket_descriptor desc; |
39d70a4a | 570 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 571 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
572 | struct scatterlist bufferlist[3]; |
573 | u64 aligned_data = 0; | |
f4266e34 | 574 | int ret; |
3e7ee490 | 575 | |
3e7ee490 | 576 | |
454f18a9 | 577 | /* Setup the descriptor */ |
415f2287 HZ |
578 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
579 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 580 | /* in 8-bytes granularity */ |
415f2287 HZ |
581 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
582 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
583 | desc.trans_id = requestid; | |
3e7ee490 | 584 | |
39d70a4a HZ |
585 | sg_init_table(bufferlist, 3); |
586 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
587 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
588 | sg_set_buf(&bufferlist[2], &aligned_data, | |
589 | packetlen_aligned - packetlen); | |
3e7ee490 | 590 | |
633c4dce | 591 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 592 | |
decc49da | 593 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 594 | vmbus_setevent(channel); |
3e7ee490 | 595 | |
3e7ee490 HJ |
596 | return ret; |
597 | } | |
fff41b2e | 598 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 599 | |
3e189519 | 600 | /* |
fff41b2e | 601 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 602 | * packets using a GPADL Direct packet type. |
f4266e34 | 603 | */ |
fff41b2e | 604 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
605 | struct hv_page_buffer pagebuffers[], |
606 | u32 pagecount, void *buffer, u32 bufferlen, | |
607 | u64 requestid) | |
3e7ee490 | 608 | { |
f4266e34 GKH |
609 | int ret; |
610 | int i; | |
430a8e9a | 611 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
612 | u32 descsize; |
613 | u32 packetlen; | |
614 | u32 packetlen_aligned; | |
615 | struct scatterlist bufferlist[3]; | |
616 | u64 aligned_data = 0; | |
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 | |
633c4dce | 652 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 653 | |
decc49da | 654 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
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; | |
ca623ad3 HZ |
676 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
677 | multi_pagebuffer->len); | |
3e7ee490 | 678 | |
3e7ee490 | 679 | |
39d70a4a | 680 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 681 | return -EINVAL; |
3e7ee490 | 682 | |
f4266e34 | 683 | /* |
430a8e9a | 684 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
685 | * the largest size we support |
686 | */ | |
39d70a4a HZ |
687 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
688 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 689 | sizeof(u64)); |
39d70a4a | 690 | packetlen = descsize + bufferlen; |
73509681 | 691 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 692 | |
3e7ee490 | 693 | |
454f18a9 | 694 | /* Setup the descriptor */ |
415f2287 | 695 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 696 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
697 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
698 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
699 | desc.transactionid = requestid; | |
430a8e9a | 700 | desc.rangecount = 1; |
3e7ee490 | 701 | |
ca623ad3 HZ |
702 | desc.range.len = multi_pagebuffer->len; |
703 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 704 | |
ca623ad3 | 705 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 706 | pfncount * sizeof(u64)); |
3e7ee490 | 707 | |
39d70a4a HZ |
708 | sg_init_table(bufferlist, 3); |
709 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
710 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
711 | sg_set_buf(&bufferlist[2], &aligned_data, | |
712 | packetlen_aligned - packetlen); | |
3e7ee490 | 713 | |
633c4dce | 714 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 715 | |
decc49da | 716 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 717 | vmbus_setevent(channel); |
3e7ee490 | 718 | |
3e7ee490 HJ |
719 | return ret; |
720 | } | |
4cb106fa | 721 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
722 | |
723 | /** | |
fff41b2e | 724 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
725 | * @channel: Pointer to vmbus_channel structure. |
726 | * @buffer: Pointer to the buffer you want to receive the data into. | |
727 | * @bufferlen: Maximum size of what the the buffer will hold | |
728 | * @buffer_actual_len: The actual size of the data after it was received | |
729 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
730 | * |
731 | * Receives directly from the hyper-v vmbus and puts the data it received | |
732 | * into Buffer. This will receive the data unparsed from hyper-v. | |
733 | * | |
734 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 735 | */ |
fff41b2e | 736 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 737 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 738 | { |
8dc0a06a | 739 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
740 | u32 packetlen; |
741 | u32 userlen; | |
3e7ee490 HJ |
742 | int ret; |
743 | ||
39d70a4a HZ |
744 | *buffer_actual_len = 0; |
745 | *requestid = 0; | |
3e7ee490 | 746 | |
3e7ee490 | 747 | |
a89186c2 | 748 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 749 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 750 | if (ret != 0) |
3e7ee490 | 751 | return 0; |
3e7ee490 | 752 | |
415f2287 HZ |
753 | packetlen = desc.len8 << 3; |
754 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 755 | |
39d70a4a | 756 | *buffer_actual_len = userlen; |
3e7ee490 | 757 | |
39d70a4a | 758 | if (userlen > bufferlen) { |
3e7ee490 | 759 | |
0a46618d | 760 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 761 | bufferlen, userlen); |
926ae526 | 762 | return -ETOOSMALL; |
3e7ee490 HJ |
763 | } |
764 | ||
415f2287 | 765 | *requestid = desc.trans_id; |
3e7ee490 | 766 | |
454f18a9 | 767 | /* Copy over the packet to the user buffer */ |
38397c8a | 768 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 769 | (desc.offset8 << 3)); |
3e7ee490 | 770 | |
3e7ee490 | 771 | |
3e7ee490 HJ |
772 | return 0; |
773 | } | |
fff41b2e | 774 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 775 | |
3e189519 | 776 | /* |
fff41b2e | 777 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 778 | */ |
fff41b2e | 779 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
780 | u32 bufferlen, u32 *buffer_actual_len, |
781 | u64 *requestid) | |
3e7ee490 | 782 | { |
8dc0a06a | 783 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
784 | u32 packetlen; |
785 | u32 userlen; | |
3e7ee490 HJ |
786 | int ret; |
787 | ||
39d70a4a HZ |
788 | *buffer_actual_len = 0; |
789 | *requestid = 0; | |
3e7ee490 | 790 | |
3e7ee490 | 791 | |
a89186c2 | 792 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 | 793 | sizeof(struct vmpacket_descriptor)); |
dad76bf7 | 794 | if (ret != 0) |
3e7ee490 | 795 | return 0; |
3e7ee490 | 796 | |
3e7ee490 | 797 | |
415f2287 HZ |
798 | packetlen = desc.len8 << 3; |
799 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 800 | |
39d70a4a | 801 | *buffer_actual_len = packetlen; |
3e7ee490 | 802 | |
39d70a4a | 803 | if (packetlen > bufferlen) { |
0a46618d HJ |
804 | pr_err("Buffer too small - needed %d bytes but " |
805 | "got space for only %d bytes\n", | |
806 | packetlen, bufferlen); | |
3d5cad97 | 807 | return -ENOBUFS; |
3e7ee490 HJ |
808 | } |
809 | ||
415f2287 | 810 | *requestid = desc.trans_id; |
3e7ee490 | 811 | |
454f18a9 | 812 | /* Copy over the entire packet to the user buffer */ |
38397c8a | 813 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 814 | |
3e7ee490 HJ |
815 | return 0; |
816 | } | |
adaee6bd | 817 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |