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> |
3f335ea2 S |
29 | |
30 | #include "hyperv.h" | |
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; | |
454f18a9 | 79 | /* u32 monitorBit = 1 << monitorOffset; */ |
3e7ee490 | 80 | |
c50f7fb2 HZ |
81 | debuginfo->relid = channel->offermsg.child_relid; |
82 | debuginfo->state = channel->state; | |
83 | memcpy(&debuginfo->interfacetype, | |
767dff68 | 84 | &channel->offermsg.offer.if_type, sizeof(struct hv_guid)); |
c50f7fb2 | 85 | memcpy(&debuginfo->interface_instance, |
767dff68 | 86 | &channel->offermsg.offer.if_instance, |
f4266e34 | 87 | sizeof(struct hv_guid)); |
3e7ee490 | 88 | |
da9fcb72 | 89 | monitorpage = (struct hv_monitor_page *)vmbus_connection.monitor_pages; |
3e7ee490 | 90 | |
c50f7fb2 | 91 | debuginfo->monitorid = channel->offermsg.monitorid; |
3e7ee490 | 92 | |
c50f7fb2 | 93 | debuginfo->servermonitor_pending = |
f6feebe0 | 94 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 95 | debuginfo->servermonitor_latency = |
f6feebe0 | 96 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 97 | debuginfo->servermonitor_connectionid = |
f6feebe0 HZ |
98 | monitorpage->parameter[monitor_group] |
99 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 100 | |
39d70a4a | 101 | monitorpage++; |
3e7ee490 | 102 | |
c50f7fb2 | 103 | debuginfo->clientmonitor_pending = |
f6feebe0 | 104 | monitorpage->trigger_group[monitor_group].pending; |
c50f7fb2 | 105 | debuginfo->clientmonitor_latency = |
f6feebe0 | 106 | monitorpage->latency[monitor_group][monitor_offset]; |
c50f7fb2 | 107 | debuginfo->clientmonitor_connectionid = |
f6feebe0 HZ |
108 | monitorpage->parameter[monitor_group] |
109 | [monitor_offset].connectionid.u.id; | |
3e7ee490 | 110 | |
a75b61d5 S |
111 | hv_ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
112 | hv_ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); | |
3e7ee490 HJ |
113 | } |
114 | ||
3e189519 | 115 | /* |
fff41b2e | 116 | * vmbus_open - Open the specified channel. |
f4266e34 | 117 | */ |
fff41b2e | 118 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
39d70a4a HZ |
119 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
120 | void (*onchannelcallback)(void *context), void *context) | |
3e7ee490 | 121 | { |
82250213 | 122 | struct vmbus_channel_open_channel *openMsg; |
b94ef345 | 123 | struct vmbus_channel_msginfo *openInfo = NULL; |
3e7ee490 | 124 | void *in, *out; |
dd0813b6 | 125 | unsigned long flags; |
9568a193 | 126 | int ret, t, err = 0; |
3e7ee490 | 127 | |
c50f7fb2 HZ |
128 | newchannel->onchannel_callback = onchannelcallback; |
129 | newchannel->channel_callback_context = context; | |
3e7ee490 | 130 | |
454f18a9 | 131 | /* Allocate the ring buffer */ |
df3493e0 S |
132 | out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, |
133 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
134 | ||
7e052d98 BP |
135 | if (!out) |
136 | return -ENOMEM; | |
137 | ||
3e7ee490 | 138 | |
39d70a4a | 139 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
3e7ee490 | 140 | |
c50f7fb2 HZ |
141 | newchannel->ringbuffer_pages = out; |
142 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + | |
39d70a4a | 143 | recv_ringbuffer_size) >> PAGE_SHIFT; |
3e7ee490 | 144 | |
72a95cbc S |
145 | ret = hv_ringbuffer_init( |
146 | &newchannel->outbound, out, send_ringbuffer_size); | |
147 | ||
fd4dc88e | 148 | if (ret != 0) { |
3324fb40 BP |
149 | err = ret; |
150 | goto errorout; | |
151 | } | |
152 | ||
72a95cbc S |
153 | ret = hv_ringbuffer_init( |
154 | &newchannel->inbound, in, recv_ringbuffer_size); | |
fd4dc88e | 155 | if (ret != 0) { |
3324fb40 BP |
156 | err = ret; |
157 | goto errorout; | |
158 | } | |
3e7ee490 | 159 | |
3e7ee490 | 160 | |
454f18a9 | 161 | /* Establish the gpadl for the ring buffer */ |
c50f7fb2 | 162 | newchannel->ringbuffer_gpadlhandle = 0; |
3e7ee490 | 163 | |
fff41b2e | 164 | ret = vmbus_establish_gpadl(newchannel, |
82f8bd40 | 165 | newchannel->outbound.ring_buffer, |
39d70a4a HZ |
166 | send_ringbuffer_size + |
167 | recv_ringbuffer_size, | |
c50f7fb2 | 168 | &newchannel->ringbuffer_gpadlhandle); |
b94ef345 | 169 | |
fd4dc88e | 170 | if (ret != 0) { |
b94ef345 BP |
171 | err = ret; |
172 | goto errorout; | |
173 | } | |
f4266e34 | 174 | |
454f18a9 | 175 | /* Create and init the channel open message */ |
f4266e34 GKH |
176 | openInfo = kmalloc(sizeof(*openInfo) + |
177 | sizeof(struct vmbus_channel_open_channel), | |
178 | GFP_KERNEL); | |
c3bf2e26 BP |
179 | if (!openInfo) { |
180 | err = -ENOMEM; | |
181 | goto errorout; | |
182 | } | |
3e7ee490 | 183 | |
9568a193 | 184 | init_completion(&openInfo->waitevent); |
3e7ee490 | 185 | |
c50f7fb2 HZ |
186 | openMsg = (struct vmbus_channel_open_channel *)openInfo->msg; |
187 | openMsg->header.msgtype = CHANNELMSG_OPENCHANNEL; | |
f27df643 | 188 | openMsg->openid = newchannel->offermsg.child_relid; |
c50f7fb2 HZ |
189 | openMsg->child_relid = newchannel->offermsg.child_relid; |
190 | openMsg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; | |
191 | openMsg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> | |
f4266e34 | 192 | PAGE_SHIFT; |
f27df643 | 193 | openMsg->server_contextarea_gpadlhandle = 0; |
3e7ee490 | 194 | |
39d70a4a | 195 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
c827f944 BP |
196 | err = -EINVAL; |
197 | goto errorout; | |
198 | } | |
199 | ||
39d70a4a | 200 | if (userdatalen) |
c50f7fb2 | 201 | memcpy(openMsg->userdata, userdata, userdatalen); |
3e7ee490 | 202 | |
15b2f647 | 203 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 204 | list_add_tail(&openInfo->msglistentry, |
da9fcb72 | 205 | &vmbus_connection.chn_msg_list); |
15b2f647 | 206 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 207 | |
c6977677 | 208 | ret = vmbus_post_msg(openMsg, |
f4266e34 | 209 | sizeof(struct vmbus_channel_open_channel)); |
98e08702 HJ |
210 | |
211 | if (ret != 0) | |
00d760b0 | 212 | goto cleanup; |
3e7ee490 | 213 | |
9568a193 S |
214 | t = wait_for_completion_timeout(&openInfo->waitevent, HZ); |
215 | if (t == 0) { | |
0c3b7b2f S |
216 | err = -ETIMEDOUT; |
217 | goto errorout; | |
218 | } | |
219 | ||
3e7ee490 | 220 | |
98e08702 HJ |
221 | if (openInfo->response.open_result.status) |
222 | err = openInfo->response.open_result.status; | |
3e7ee490 | 223 | |
00d760b0 | 224 | cleanup: |
15b2f647 | 225 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 226 | list_del(&openInfo->msglistentry); |
15b2f647 | 227 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 228 | |
8c69f52a | 229 | kfree(openInfo); |
98e08702 | 230 | return err; |
c3bf2e26 BP |
231 | |
232 | errorout: | |
2dba688b S |
233 | hv_ringbuffer_cleanup(&newchannel->outbound); |
234 | hv_ringbuffer_cleanup(&newchannel->inbound); | |
df3493e0 S |
235 | free_pages((unsigned long)out, |
236 | get_order(send_ringbuffer_size + recv_ringbuffer_size)); | |
c3bf2e26 BP |
237 | kfree(openInfo); |
238 | return err; | |
3e7ee490 | 239 | } |
36ceadfc | 240 | EXPORT_SYMBOL_GPL(vmbus_open); |
3e7ee490 | 241 | |
3e189519 | 242 | /* |
fff41b2e | 243 | * dump_gpadl_body - Dump the gpadl body message to the console for |
3e189519 | 244 | * debugging purposes. |
f4266e34 | 245 | */ |
fff41b2e | 246 | static void dump_gpadl_body(struct vmbus_channel_gpadl_body *gpadl, u32 len) |
3e7ee490 | 247 | { |
f4266e34 | 248 | int i; |
39d70a4a | 249 | int pfncount; |
3e7ee490 | 250 | |
39d70a4a | 251 | pfncount = (len - sizeof(struct vmbus_channel_gpadl_body)) / |
f4266e34 | 252 | sizeof(u64); |
98e08702 | 253 | |
39d70a4a | 254 | DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", len, pfncount); |
3e7ee490 | 255 | |
39d70a4a | 256 | for (i = 0; i < pfncount; i++) |
f4266e34 | 257 | DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu", |
c50f7fb2 | 258 | i, gpadl->pfn[i]); |
3e7ee490 HJ |
259 | } |
260 | ||
3e189519 | 261 | /* |
fff41b2e | 262 | * dump_gpadl_header - Dump the gpadl header message to the console for |
3e189519 | 263 | * debugging purposes. |
f4266e34 | 264 | */ |
fff41b2e | 265 | static void dump_gpadl_header(struct vmbus_channel_gpadl_header *gpadl) |
3e7ee490 | 266 | { |
f4266e34 | 267 | int i, j; |
39d70a4a | 268 | int pagecount; |
3e7ee490 | 269 | |
f4266e34 GKH |
270 | DPRINT_DBG(VMBUS, |
271 | "gpadl header - relid %d, range count %d, range buflen %d", | |
c50f7fb2 HZ |
272 | gpadl->child_relid, gpadl->rangecount, gpadl->range_buflen); |
273 | for (i = 0; i < gpadl->rangecount; i++) { | |
415f2287 | 274 | pagecount = gpadl->range[i].byte_count >> PAGE_SHIFT; |
39d70a4a | 275 | pagecount = (pagecount > 26) ? 26 : pagecount; |
3e7ee490 | 276 | |
f4266e34 | 277 | DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d " |
415f2287 HZ |
278 | "page count %d", i, gpadl->range[i].byte_count, |
279 | gpadl->range[i].byte_offset, pagecount); | |
3e7ee490 | 280 | |
39d70a4a | 281 | for (j = 0; j < pagecount; j++) |
f4266e34 | 282 | DPRINT_DBG(VMBUS, "%d) pfn %llu", j, |
415f2287 | 283 | gpadl->range[i].pfn_array[j]); |
3e7ee490 HJ |
284 | } |
285 | } | |
286 | ||
3e189519 | 287 | /* |
fff41b2e | 288 | * create_gpadl_header - Creates a gpadl for the specified buffer |
f4266e34 | 289 | */ |
fff41b2e | 290 | static int create_gpadl_header(void *kbuffer, u32 size, |
39d70a4a HZ |
291 | struct vmbus_channel_msginfo **msginfo, |
292 | u32 *messagecount) | |
3e7ee490 HJ |
293 | { |
294 | int i; | |
39d70a4a | 295 | int pagecount; |
f4266e34 | 296 | unsigned long long pfn; |
39d70a4a HZ |
297 | struct vmbus_channel_gpadl_header *gpadl_header; |
298 | struct vmbus_channel_gpadl_body *gpadl_body; | |
299 | struct vmbus_channel_msginfo *msgheader; | |
300 | struct vmbus_channel_msginfo *msgbody = NULL; | |
301 | u32 msgsize; | |
3e7ee490 | 302 | |
39d70a4a | 303 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
3e7ee490 | 304 | |
39d70a4a HZ |
305 | pagecount = size >> PAGE_SHIFT; |
306 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; | |
3e7ee490 | 307 | |
454f18a9 | 308 | /* do we need a gpadl body msg */ |
39d70a4a | 309 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 GKH |
310 | sizeof(struct vmbus_channel_gpadl_header) - |
311 | sizeof(struct gpa_range); | |
39d70a4a | 312 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 313 | |
39d70a4a | 314 | if (pagecount > pfncount) { |
f4266e34 | 315 | /* we need a gpadl body */ |
454f18a9 | 316 | /* fill in the header */ |
39d70a4a | 317 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 318 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
319 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
320 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
321 | if (!msgheader) | |
d1c250bb | 322 | goto nomem; |
3e7ee490 | 323 | |
c50f7fb2 HZ |
324 | INIT_LIST_HEAD(&msgheader->submsglist); |
325 | msgheader->msgsize = msgsize; | |
3e7ee490 | 326 | |
39d70a4a | 327 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
c50f7fb2 HZ |
328 | msgheader->msg; |
329 | gpadl_header->rangecount = 1; | |
330 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 331 | pagecount * sizeof(u64); |
415f2287 HZ |
332 | gpadl_header->range[0].byte_offset = 0; |
333 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 334 | for (i = 0; i < pfncount; i++) |
415f2287 | 335 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
336 | *msginfo = msgheader; |
337 | *messagecount = 1; | |
3e7ee490 | 338 | |
39d70a4a HZ |
339 | pfnsum = pfncount; |
340 | pfnleft = pagecount - pfncount; | |
3e7ee490 | 341 | |
454f18a9 | 342 | /* how many pfns can we fit */ |
39d70a4a | 343 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
f4266e34 | 344 | sizeof(struct vmbus_channel_gpadl_body); |
39d70a4a | 345 | pfncount = pfnsize / sizeof(u64); |
3e7ee490 | 346 | |
454f18a9 | 347 | /* fill in the body */ |
39d70a4a HZ |
348 | while (pfnleft) { |
349 | if (pfnleft > pfncount) | |
350 | pfncurr = pfncount; | |
3e7ee490 | 351 | else |
39d70a4a | 352 | pfncurr = pfnleft; |
3e7ee490 | 353 | |
39d70a4a | 354 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 355 | sizeof(struct vmbus_channel_gpadl_body) + |
39d70a4a HZ |
356 | pfncurr * sizeof(u64); |
357 | msgbody = kzalloc(msgsize, GFP_KERNEL); | |
f38cf9cc S |
358 | |
359 | if (!msgbody) { | |
360 | struct vmbus_channel_msginfo *pos = NULL; | |
361 | struct vmbus_channel_msginfo *tmp = NULL; | |
362 | /* | |
363 | * Free up all the allocated messages. | |
364 | */ | |
365 | list_for_each_entry_safe(pos, tmp, | |
366 | &msgheader->submsglist, | |
367 | msglistentry) { | |
368 | ||
369 | list_del(&pos->msglistentry); | |
370 | kfree(pos); | |
371 | } | |
372 | ||
d1c250bb | 373 | goto nomem; |
f38cf9cc S |
374 | } |
375 | ||
c50f7fb2 | 376 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
377 | (*messagecount)++; |
378 | gpadl_body = | |
c50f7fb2 | 379 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
380 | |
381 | /* | |
f4266e34 GKH |
382 | * Gpadl is u32 and we are using a pointer which could |
383 | * be 64-bit | |
f27df643 S |
384 | * This is governed by the guest/host protocol and |
385 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 386 | */ |
39d70a4a | 387 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 388 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 389 | |
454f18a9 | 390 | /* add to msg header */ |
c50f7fb2 HZ |
391 | list_add_tail(&msgbody->msglistentry, |
392 | &msgheader->submsglist); | |
39d70a4a HZ |
393 | pfnsum += pfncurr; |
394 | pfnleft -= pfncurr; | |
3e7ee490 | 395 | } |
f4266e34 | 396 | } else { |
454f18a9 | 397 | /* everything fits in a header */ |
39d70a4a | 398 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 399 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
400 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
401 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
402 | if (msgheader == NULL) | |
e3eb7cdd | 403 | goto nomem; |
c50f7fb2 | 404 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
405 | |
406 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
407 | msgheader->msg; |
408 | gpadl_header->rangecount = 1; | |
409 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 410 | pagecount * sizeof(u64); |
415f2287 HZ |
411 | gpadl_header->range[0].byte_offset = 0; |
412 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 413 | for (i = 0; i < pagecount; i++) |
415f2287 | 414 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
415 | |
416 | *msginfo = msgheader; | |
417 | *messagecount = 1; | |
3e7ee490 HJ |
418 | } |
419 | ||
420 | return 0; | |
d1c250bb | 421 | nomem: |
39d70a4a HZ |
422 | kfree(msgheader); |
423 | kfree(msgbody); | |
d1c250bb | 424 | return -ENOMEM; |
3e7ee490 HJ |
425 | } |
426 | ||
3e189519 | 427 | /* |
fff41b2e | 428 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 429 | * |
39d70a4a HZ |
430 | * @channel: a channel |
431 | * @kbuffer: from kmalloc | |
432 | * @size: page-size multiple | |
433 | * @gpadl_handle: some funky thing | |
f4266e34 | 434 | */ |
fff41b2e | 435 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 436 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 437 | { |
39d70a4a HZ |
438 | struct vmbus_channel_gpadl_header *gpadlmsg; |
439 | struct vmbus_channel_gpadl_body *gpadl_body; | |
82250213 | 440 | /* struct vmbus_channel_gpadl_created *gpadlCreated; */ |
39d70a4a HZ |
441 | struct vmbus_channel_msginfo *msginfo = NULL; |
442 | struct vmbus_channel_msginfo *submsginfo; | |
443 | u32 msgcount; | |
53af545b | 444 | struct list_head *curr; |
39d70a4a | 445 | u32 next_gpadl_handle; |
dd0813b6 | 446 | unsigned long flags; |
c3bf2e26 | 447 | int ret = 0; |
9568a193 | 448 | int t; |
3e7ee490 | 449 | |
da9fcb72 HZ |
450 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
451 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 452 | |
fff41b2e | 453 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
454 | if (ret) |
455 | return ret; | |
3e7ee490 | 456 | |
9568a193 | 457 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 458 | |
c50f7fb2 HZ |
459 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
460 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
461 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
462 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 463 | |
fff41b2e | 464 | dump_gpadl_header(gpadlmsg); |
3e7ee490 | 465 | |
15b2f647 | 466 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 467 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 468 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 469 | |
15b2f647 | 470 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 471 | |
c6977677 | 472 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 473 | sizeof(*msginfo)); |
98e08702 | 474 | if (ret != 0) |
00d760b0 | 475 | goto cleanup; |
3e7ee490 | 476 | |
39d70a4a | 477 | if (msgcount > 1) { |
c50f7fb2 | 478 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 479 | |
39d70a4a HZ |
480 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
481 | gpadl_body = | |
c50f7fb2 | 482 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 483 | |
c50f7fb2 HZ |
484 | gpadl_body->header.msgtype = |
485 | CHANNELMSG_GPADL_BODY; | |
486 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 487 | |
c50f7fb2 | 488 | dump_gpadl_body(gpadl_body, submsginfo->msgsize - |
39d70a4a | 489 | sizeof(*submsginfo)); |
c6977677 | 490 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 491 | submsginfo->msgsize - |
39d70a4a | 492 | sizeof(*submsginfo)); |
fd4dc88e | 493 | if (ret != 0) |
00d760b0 | 494 | goto cleanup; |
99259159 | 495 | |
3e7ee490 HJ |
496 | } |
497 | } | |
40961de3 | 498 | t = wait_for_completion_timeout(&msginfo->waitevent, 5*HZ); |
9568a193 | 499 | BUG_ON(t == 0); |
0c3b7b2f | 500 | |
3e7ee490 | 501 | |
454f18a9 | 502 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 503 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 | 504 | |
00d760b0 | 505 | cleanup: |
15b2f647 | 506 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 507 | list_del(&msginfo->msglistentry); |
15b2f647 | 508 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 509 | |
39d70a4a | 510 | kfree(msginfo); |
3e7ee490 HJ |
511 | return ret; |
512 | } | |
98873724 | 513 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 514 | |
3e189519 | 515 | /* |
fff41b2e | 516 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 517 | */ |
fff41b2e | 518 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 519 | { |
82250213 | 520 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 521 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 522 | unsigned long flags; |
9568a193 | 523 | int ret, t; |
3e7ee490 | 524 | |
39d70a4a | 525 | /* ASSERT(gpadl_handle != 0); */ |
3e7ee490 | 526 | |
f4266e34 GKH |
527 | info = kmalloc(sizeof(*info) + |
528 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
529 | if (!info) |
530 | return -ENOMEM; | |
3e7ee490 | 531 | |
9568a193 | 532 | init_completion(&info->waitevent); |
3e7ee490 | 533 | |
c50f7fb2 | 534 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 535 | |
c50f7fb2 HZ |
536 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
537 | msg->child_relid = channel->offermsg.child_relid; | |
538 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 539 | |
15b2f647 | 540 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 541 | list_add_tail(&info->msglistentry, |
da9fcb72 | 542 | &vmbus_connection.chn_msg_list); |
15b2f647 | 543 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 544 | ret = vmbus_post_msg(msg, |
f4266e34 | 545 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 546 | |
0c3b7b2f | 547 | BUG_ON(ret != 0); |
40961de3 | 548 | t = wait_for_completion_timeout(&info->waitevent, 5*HZ); |
9568a193 | 549 | BUG_ON(t == 0); |
3e7ee490 | 550 | |
454f18a9 | 551 | /* Received a torndown response */ |
15b2f647 | 552 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 553 | list_del(&info->msglistentry); |
15b2f647 | 554 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 555 | |
8c69f52a | 556 | kfree(info); |
3e7ee490 HJ |
557 | return ret; |
558 | } | |
18726d7a | 559 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 560 | |
3e189519 | 561 | /* |
fff41b2e | 562 | * vmbus_close - Close the specified channel |
f4266e34 | 563 | */ |
fff41b2e | 564 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 565 | { |
82250213 | 566 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 567 | int ret; |
3e7ee490 | 568 | |
454f18a9 | 569 | /* Stop callback and cancel the timer asap */ |
c50f7fb2 | 570 | channel->onchannel_callback = NULL; |
3e7ee490 | 571 | |
454f18a9 | 572 | /* Send a closing message */ |
3e7ee490 | 573 | |
e9a27a9f | 574 | msg = &channel->close_msg.msg; |
3e7ee490 | 575 | |
c50f7fb2 HZ |
576 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
577 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 578 | |
c6977677 | 579 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 580 | |
0c3b7b2f | 581 | BUG_ON(ret != 0); |
454f18a9 | 582 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 583 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 584 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 585 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 586 | |
454f18a9 | 587 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
588 | hv_ringbuffer_cleanup(&channel->outbound); |
589 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 590 | |
df3493e0 S |
591 | free_pages((unsigned long)channel->ringbuffer_pages, |
592 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 593 | |
3e7ee490 | 594 | |
3e7ee490 | 595 | } |
70bfa307 | 596 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 597 | |
c88c4e4c | 598 | /** |
fff41b2e | 599 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
600 | * @channel: Pointer to vmbus_channel structure. |
601 | * @buffer: Pointer to the buffer you want to receive the data into. | |
602 | * @bufferlen: Maximum size of what the the buffer will hold | |
603 | * @requestid: Identifier of the request | |
604 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
605 | * packet etc. |
606 | * | |
39d70a4a | 607 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
608 | * This will send the data unparsed to hyper-v. |
609 | * | |
610 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 611 | */ |
fff41b2e | 612 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
613 | u32 bufferlen, u64 requestid, |
614 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 615 | { |
8dc0a06a | 616 | struct vmpacket_descriptor desc; |
39d70a4a | 617 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 618 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
619 | struct scatterlist bufferlist[3]; |
620 | u64 aligned_data = 0; | |
f4266e34 | 621 | int ret; |
3e7ee490 | 622 | |
3e7ee490 | 623 | |
454f18a9 | 624 | /* Setup the descriptor */ |
415f2287 HZ |
625 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
626 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 627 | /* in 8-bytes granularity */ |
415f2287 HZ |
628 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
629 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
630 | desc.trans_id = requestid; | |
3e7ee490 | 631 | |
39d70a4a HZ |
632 | sg_init_table(bufferlist, 3); |
633 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
634 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
635 | sg_set_buf(&bufferlist[2], &aligned_data, | |
636 | packetlen_aligned - packetlen); | |
3e7ee490 | 637 | |
633c4dce | 638 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 639 | |
decc49da | 640 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 641 | vmbus_setevent(channel); |
3e7ee490 | 642 | |
3e7ee490 HJ |
643 | return ret; |
644 | } | |
fff41b2e | 645 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 646 | |
3e189519 | 647 | /* |
fff41b2e | 648 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 649 | * packets using a GPADL Direct packet type. |
f4266e34 | 650 | */ |
fff41b2e | 651 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
652 | struct hv_page_buffer pagebuffers[], |
653 | u32 pagecount, void *buffer, u32 bufferlen, | |
654 | u64 requestid) | |
3e7ee490 | 655 | { |
f4266e34 GKH |
656 | int ret; |
657 | int i; | |
430a8e9a | 658 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
659 | u32 descsize; |
660 | u32 packetlen; | |
661 | u32 packetlen_aligned; | |
662 | struct scatterlist bufferlist[3]; | |
663 | u64 aligned_data = 0; | |
3e7ee490 | 664 | |
39d70a4a | 665 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 666 | return -EINVAL; |
3e7ee490 | 667 | |
3e7ee490 | 668 | |
f4266e34 | 669 | /* |
430a8e9a | 670 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
671 | * largest size we support |
672 | */ | |
39d70a4a HZ |
673 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
674 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 675 | sizeof(struct hv_page_buffer)); |
39d70a4a | 676 | packetlen = descsize + bufferlen; |
73509681 | 677 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 678 | |
454f18a9 | 679 | /* Setup the descriptor */ |
415f2287 | 680 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 681 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
682 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
683 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
684 | desc.transactionid = requestid; | |
685 | desc.rangecount = pagecount; | |
686 | ||
687 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
688 | desc.range[i].len = pagebuffers[i].len; |
689 | desc.range[i].offset = pagebuffers[i].offset; | |
690 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
691 | } |
692 | ||
39d70a4a HZ |
693 | sg_init_table(bufferlist, 3); |
694 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
695 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
696 | sg_set_buf(&bufferlist[2], &aligned_data, | |
697 | packetlen_aligned - packetlen); | |
3e7ee490 | 698 | |
633c4dce | 699 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 700 | |
decc49da | 701 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 702 | vmbus_setevent(channel); |
3e7ee490 | 703 | |
3e7ee490 HJ |
704 | return ret; |
705 | } | |
713efeb4 | 706 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 707 | |
3e189519 | 708 | /* |
fff41b2e | 709 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 710 | * using a GPADL Direct packet type. |
f4266e34 | 711 | */ |
fff41b2e | 712 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
713 | struct hv_multipage_buffer *multi_pagebuffer, |
714 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 715 | { |
f4266e34 | 716 | int ret; |
430a8e9a | 717 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
718 | u32 descsize; |
719 | u32 packetlen; | |
720 | u32 packetlen_aligned; | |
721 | struct scatterlist bufferlist[3]; | |
722 | u64 aligned_data = 0; | |
ca623ad3 HZ |
723 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
724 | multi_pagebuffer->len); | |
3e7ee490 | 725 | |
3e7ee490 | 726 | |
39d70a4a | 727 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 728 | return -EINVAL; |
3e7ee490 | 729 | |
f4266e34 | 730 | /* |
430a8e9a | 731 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
732 | * the largest size we support |
733 | */ | |
39d70a4a HZ |
734 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
735 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 736 | sizeof(u64)); |
39d70a4a | 737 | packetlen = descsize + bufferlen; |
73509681 | 738 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 739 | |
3e7ee490 | 740 | |
454f18a9 | 741 | /* Setup the descriptor */ |
415f2287 | 742 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 743 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
744 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
745 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
746 | desc.transactionid = requestid; | |
430a8e9a | 747 | desc.rangecount = 1; |
3e7ee490 | 748 | |
ca623ad3 HZ |
749 | desc.range.len = multi_pagebuffer->len; |
750 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 751 | |
ca623ad3 | 752 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 753 | pfncount * sizeof(u64)); |
3e7ee490 | 754 | |
39d70a4a HZ |
755 | sg_init_table(bufferlist, 3); |
756 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
757 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
758 | sg_set_buf(&bufferlist[2], &aligned_data, | |
759 | packetlen_aligned - packetlen); | |
3e7ee490 | 760 | |
633c4dce | 761 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 762 | |
decc49da | 763 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 764 | vmbus_setevent(channel); |
3e7ee490 | 765 | |
3e7ee490 HJ |
766 | return ret; |
767 | } | |
4cb106fa | 768 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
769 | |
770 | /** | |
fff41b2e | 771 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
772 | * @channel: Pointer to vmbus_channel structure. |
773 | * @buffer: Pointer to the buffer you want to receive the data into. | |
774 | * @bufferlen: Maximum size of what the the buffer will hold | |
775 | * @buffer_actual_len: The actual size of the data after it was received | |
776 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
777 | * |
778 | * Receives directly from the hyper-v vmbus and puts the data it received | |
779 | * into Buffer. This will receive the data unparsed from hyper-v. | |
780 | * | |
781 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 782 | */ |
fff41b2e | 783 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 784 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 785 | { |
8dc0a06a | 786 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
787 | u32 packetlen; |
788 | u32 userlen; | |
3e7ee490 | 789 | int ret; |
54411c42 | 790 | unsigned long flags; |
3e7ee490 | 791 | |
39d70a4a HZ |
792 | *buffer_actual_len = 0; |
793 | *requestid = 0; | |
3e7ee490 | 794 | |
39d70a4a | 795 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 796 | |
a89186c2 | 797 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
798 | sizeof(struct vmpacket_descriptor)); |
799 | if (ret != 0) { | |
39d70a4a | 800 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
801 | return 0; |
802 | } | |
803 | ||
415f2287 HZ |
804 | packetlen = desc.len8 << 3; |
805 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 806 | |
39d70a4a | 807 | *buffer_actual_len = userlen; |
3e7ee490 | 808 | |
39d70a4a HZ |
809 | if (userlen > bufferlen) { |
810 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 811 | |
0a46618d | 812 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 813 | bufferlen, userlen); |
926ae526 | 814 | return -ETOOSMALL; |
3e7ee490 HJ |
815 | } |
816 | ||
415f2287 | 817 | *requestid = desc.trans_id; |
3e7ee490 | 818 | |
454f18a9 | 819 | /* Copy over the packet to the user buffer */ |
38397c8a | 820 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 821 | (desc.offset8 << 3)); |
3e7ee490 | 822 | |
39d70a4a | 823 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 824 | |
3e7ee490 HJ |
825 | return 0; |
826 | } | |
fff41b2e | 827 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 828 | |
3e189519 | 829 | /* |
fff41b2e | 830 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 831 | */ |
fff41b2e | 832 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
833 | u32 bufferlen, u32 *buffer_actual_len, |
834 | u64 *requestid) | |
3e7ee490 | 835 | { |
8dc0a06a | 836 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
837 | u32 packetlen; |
838 | u32 userlen; | |
3e7ee490 | 839 | int ret; |
54411c42 | 840 | unsigned long flags; |
3e7ee490 | 841 | |
39d70a4a HZ |
842 | *buffer_actual_len = 0; |
843 | *requestid = 0; | |
3e7ee490 | 844 | |
39d70a4a | 845 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 846 | |
a89186c2 | 847 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
848 | sizeof(struct vmpacket_descriptor)); |
849 | if (ret != 0) { | |
39d70a4a | 850 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
851 | return 0; |
852 | } | |
853 | ||
3e7ee490 | 854 | |
415f2287 HZ |
855 | packetlen = desc.len8 << 3; |
856 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 857 | |
39d70a4a | 858 | *buffer_actual_len = packetlen; |
3e7ee490 | 859 | |
39d70a4a HZ |
860 | if (packetlen > bufferlen) { |
861 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 862 | |
0a46618d HJ |
863 | pr_err("Buffer too small - needed %d bytes but " |
864 | "got space for only %d bytes\n", | |
865 | packetlen, bufferlen); | |
3e7ee490 HJ |
866 | return -2; |
867 | } | |
868 | ||
415f2287 | 869 | *requestid = desc.trans_id; |
3e7ee490 | 870 | |
454f18a9 | 871 | /* Copy over the entire packet to the user buffer */ |
38397c8a | 872 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 873 | |
39d70a4a | 874 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
875 | return 0; |
876 | } | |
adaee6bd | 877 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |