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) | |
3e7ee490 | 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 HJ |
223 | |
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); | |
d1c250bb | 358 | /* FIXME: we probably need to more if this fails */ |
39d70a4a | 359 | if (!msgbody) |
d1c250bb | 360 | goto nomem; |
c50f7fb2 | 361 | msgbody->msgsize = msgsize; |
39d70a4a HZ |
362 | (*messagecount)++; |
363 | gpadl_body = | |
c50f7fb2 | 364 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
f4266e34 GKH |
365 | |
366 | /* | |
f4266e34 GKH |
367 | * Gpadl is u32 and we are using a pointer which could |
368 | * be 64-bit | |
f27df643 S |
369 | * This is governed by the guest/host protocol and |
370 | * so the hypervisor gurantees that this is ok. | |
f4266e34 | 371 | */ |
39d70a4a | 372 | for (i = 0; i < pfncurr; i++) |
c50f7fb2 | 373 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
3e7ee490 | 374 | |
454f18a9 | 375 | /* add to msg header */ |
c50f7fb2 HZ |
376 | list_add_tail(&msgbody->msglistentry, |
377 | &msgheader->submsglist); | |
39d70a4a HZ |
378 | pfnsum += pfncurr; |
379 | pfnleft -= pfncurr; | |
3e7ee490 | 380 | } |
f4266e34 | 381 | } else { |
454f18a9 | 382 | /* everything fits in a header */ |
39d70a4a | 383 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
f4266e34 | 384 | sizeof(struct vmbus_channel_gpadl_header) + |
39d70a4a HZ |
385 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
386 | msgheader = kzalloc(msgsize, GFP_KERNEL); | |
387 | if (msgheader == NULL) | |
e3eb7cdd | 388 | goto nomem; |
c50f7fb2 | 389 | msgheader->msgsize = msgsize; |
39d70a4a HZ |
390 | |
391 | gpadl_header = (struct vmbus_channel_gpadl_header *) | |
c50f7fb2 HZ |
392 | msgheader->msg; |
393 | gpadl_header->rangecount = 1; | |
394 | gpadl_header->range_buflen = sizeof(struct gpa_range) + | |
39d70a4a | 395 | pagecount * sizeof(u64); |
415f2287 HZ |
396 | gpadl_header->range[0].byte_offset = 0; |
397 | gpadl_header->range[0].byte_count = size; | |
39d70a4a | 398 | for (i = 0; i < pagecount; i++) |
415f2287 | 399 | gpadl_header->range[0].pfn_array[i] = pfn+i; |
39d70a4a HZ |
400 | |
401 | *msginfo = msgheader; | |
402 | *messagecount = 1; | |
3e7ee490 HJ |
403 | } |
404 | ||
405 | return 0; | |
d1c250bb | 406 | nomem: |
39d70a4a HZ |
407 | kfree(msgheader); |
408 | kfree(msgbody); | |
d1c250bb | 409 | return -ENOMEM; |
3e7ee490 HJ |
410 | } |
411 | ||
3e189519 | 412 | /* |
fff41b2e | 413 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
f4266e34 | 414 | * |
39d70a4a HZ |
415 | * @channel: a channel |
416 | * @kbuffer: from kmalloc | |
417 | * @size: page-size multiple | |
418 | * @gpadl_handle: some funky thing | |
f4266e34 | 419 | */ |
fff41b2e | 420 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
39d70a4a | 421 | u32 size, u32 *gpadl_handle) |
3e7ee490 | 422 | { |
39d70a4a HZ |
423 | struct vmbus_channel_gpadl_header *gpadlmsg; |
424 | struct vmbus_channel_gpadl_body *gpadl_body; | |
82250213 | 425 | /* struct vmbus_channel_gpadl_created *gpadlCreated; */ |
39d70a4a HZ |
426 | struct vmbus_channel_msginfo *msginfo = NULL; |
427 | struct vmbus_channel_msginfo *submsginfo; | |
428 | u32 msgcount; | |
53af545b | 429 | struct list_head *curr; |
39d70a4a | 430 | u32 next_gpadl_handle; |
dd0813b6 | 431 | unsigned long flags; |
c3bf2e26 | 432 | int ret = 0; |
9568a193 | 433 | int t; |
3e7ee490 | 434 | |
da9fcb72 HZ |
435 | next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); |
436 | atomic_inc(&vmbus_connection.next_gpadl_handle); | |
3e7ee490 | 437 | |
fff41b2e | 438 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
c3bf2e26 BP |
439 | if (ret) |
440 | return ret; | |
3e7ee490 | 441 | |
9568a193 | 442 | init_completion(&msginfo->waitevent); |
c3bf2e26 | 443 | |
c50f7fb2 HZ |
444 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
445 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; | |
446 | gpadlmsg->child_relid = channel->offermsg.child_relid; | |
447 | gpadlmsg->gpadl = next_gpadl_handle; | |
3e7ee490 | 448 | |
fff41b2e | 449 | dump_gpadl_header(gpadlmsg); |
3e7ee490 | 450 | |
15b2f647 | 451 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 452 | list_add_tail(&msginfo->msglistentry, |
da9fcb72 | 453 | &vmbus_connection.chn_msg_list); |
3e7ee490 | 454 | |
15b2f647 | 455 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 456 | |
c6977677 | 457 | ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - |
39d70a4a | 458 | sizeof(*msginfo)); |
98e08702 | 459 | if (ret != 0) |
3e7ee490 | 460 | goto Cleanup; |
3e7ee490 | 461 | |
39d70a4a | 462 | if (msgcount > 1) { |
c50f7fb2 | 463 | list_for_each(curr, &msginfo->submsglist) { |
53af545b | 464 | |
39d70a4a HZ |
465 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
466 | gpadl_body = | |
c50f7fb2 | 467 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
3e7ee490 | 468 | |
c50f7fb2 HZ |
469 | gpadl_body->header.msgtype = |
470 | CHANNELMSG_GPADL_BODY; | |
471 | gpadl_body->gpadl = next_gpadl_handle; | |
3e7ee490 | 472 | |
c50f7fb2 | 473 | dump_gpadl_body(gpadl_body, submsginfo->msgsize - |
39d70a4a | 474 | sizeof(*submsginfo)); |
c6977677 | 475 | ret = vmbus_post_msg(gpadl_body, |
c50f7fb2 | 476 | submsginfo->msgsize - |
39d70a4a | 477 | sizeof(*submsginfo)); |
fd4dc88e | 478 | if (ret != 0) |
99259159 BP |
479 | goto Cleanup; |
480 | ||
3e7ee490 HJ |
481 | } |
482 | } | |
9568a193 S |
483 | t = wait_for_completion_timeout(&msginfo->waitevent, HZ); |
484 | BUG_ON(t == 0); | |
0c3b7b2f | 485 | |
3e7ee490 | 486 | |
454f18a9 | 487 | /* At this point, we received the gpadl created msg */ |
c50f7fb2 | 488 | *gpadl_handle = gpadlmsg->gpadl; |
3e7ee490 HJ |
489 | |
490 | Cleanup: | |
15b2f647 | 491 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 492 | list_del(&msginfo->msglistentry); |
15b2f647 | 493 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 494 | |
39d70a4a | 495 | kfree(msginfo); |
3e7ee490 HJ |
496 | return ret; |
497 | } | |
98873724 | 498 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
3e7ee490 | 499 | |
3e189519 | 500 | /* |
fff41b2e | 501 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
f4266e34 | 502 | */ |
fff41b2e | 503 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
3e7ee490 | 504 | { |
82250213 | 505 | struct vmbus_channel_gpadl_teardown *msg; |
aded7165 | 506 | struct vmbus_channel_msginfo *info; |
dd0813b6 | 507 | unsigned long flags; |
9568a193 | 508 | int ret, t; |
3e7ee490 | 509 | |
39d70a4a | 510 | /* ASSERT(gpadl_handle != 0); */ |
3e7ee490 | 511 | |
f4266e34 GKH |
512 | info = kmalloc(sizeof(*info) + |
513 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); | |
c3bf2e26 BP |
514 | if (!info) |
515 | return -ENOMEM; | |
3e7ee490 | 516 | |
9568a193 | 517 | init_completion(&info->waitevent); |
3e7ee490 | 518 | |
c50f7fb2 | 519 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
3e7ee490 | 520 | |
c50f7fb2 HZ |
521 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
522 | msg->child_relid = channel->offermsg.child_relid; | |
523 | msg->gpadl = gpadl_handle; | |
3e7ee490 | 524 | |
15b2f647 | 525 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 526 | list_add_tail(&info->msglistentry, |
da9fcb72 | 527 | &vmbus_connection.chn_msg_list); |
15b2f647 | 528 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
c6977677 | 529 | ret = vmbus_post_msg(msg, |
f4266e34 | 530 | sizeof(struct vmbus_channel_gpadl_teardown)); |
3e7ee490 | 531 | |
0c3b7b2f | 532 | BUG_ON(ret != 0); |
9568a193 S |
533 | t = wait_for_completion_timeout(&info->waitevent, HZ); |
534 | BUG_ON(t == 0); | |
3e7ee490 | 535 | |
454f18a9 | 536 | /* Received a torndown response */ |
15b2f647 | 537 | spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); |
c50f7fb2 | 538 | list_del(&info->msglistentry); |
15b2f647 | 539 | spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); |
3e7ee490 | 540 | |
8c69f52a | 541 | kfree(info); |
3e7ee490 HJ |
542 | return ret; |
543 | } | |
18726d7a | 544 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
3e7ee490 | 545 | |
3e189519 | 546 | /* |
fff41b2e | 547 | * vmbus_close - Close the specified channel |
f4266e34 | 548 | */ |
fff41b2e | 549 | void vmbus_close(struct vmbus_channel *channel) |
3e7ee490 | 550 | { |
82250213 | 551 | struct vmbus_channel_close_channel *msg; |
f4266e34 | 552 | int ret; |
3e7ee490 | 553 | |
454f18a9 | 554 | /* Stop callback and cancel the timer asap */ |
c50f7fb2 | 555 | channel->onchannel_callback = NULL; |
3e7ee490 | 556 | |
454f18a9 | 557 | /* Send a closing message */ |
3e7ee490 | 558 | |
e9a27a9f | 559 | msg = &channel->close_msg.msg; |
3e7ee490 | 560 | |
c50f7fb2 HZ |
561 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
562 | msg->child_relid = channel->offermsg.child_relid; | |
3e7ee490 | 563 | |
c6977677 | 564 | ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); |
3e7ee490 | 565 | |
0c3b7b2f | 566 | BUG_ON(ret != 0); |
454f18a9 | 567 | /* Tear down the gpadl for the channel's ring buffer */ |
c50f7fb2 | 568 | if (channel->ringbuffer_gpadlhandle) |
fff41b2e | 569 | vmbus_teardown_gpadl(channel, |
c50f7fb2 | 570 | channel->ringbuffer_gpadlhandle); |
3e7ee490 | 571 | |
454f18a9 | 572 | /* Cleanup the ring buffers for this channel */ |
2dba688b S |
573 | hv_ringbuffer_cleanup(&channel->outbound); |
574 | hv_ringbuffer_cleanup(&channel->inbound); | |
3e7ee490 | 575 | |
df3493e0 S |
576 | free_pages((unsigned long)channel->ringbuffer_pages, |
577 | get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); | |
3e7ee490 | 578 | |
3e7ee490 | 579 | |
3e7ee490 | 580 | } |
70bfa307 | 581 | EXPORT_SYMBOL_GPL(vmbus_close); |
3e7ee490 | 582 | |
c88c4e4c | 583 | /** |
fff41b2e | 584 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
39d70a4a HZ |
585 | * @channel: Pointer to vmbus_channel structure. |
586 | * @buffer: Pointer to the buffer you want to receive the data into. | |
587 | * @bufferlen: Maximum size of what the the buffer will hold | |
588 | * @requestid: Identifier of the request | |
589 | * @type: Type of packet that is being send e.g. negotiate, time | |
c88c4e4c HJ |
590 | * packet etc. |
591 | * | |
39d70a4a | 592 | * Sends data in @buffer directly to hyper-v via the vmbus |
c88c4e4c HJ |
593 | * This will send the data unparsed to hyper-v. |
594 | * | |
595 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 596 | */ |
fff41b2e | 597 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
39d70a4a HZ |
598 | u32 bufferlen, u64 requestid, |
599 | enum vmbus_packet_type type, u32 flags) | |
3e7ee490 | 600 | { |
8dc0a06a | 601 | struct vmpacket_descriptor desc; |
39d70a4a | 602 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
73509681 | 603 | u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
39d70a4a HZ |
604 | struct scatterlist bufferlist[3]; |
605 | u64 aligned_data = 0; | |
f4266e34 | 606 | int ret; |
3e7ee490 | 607 | |
3e7ee490 | 608 | |
454f18a9 | 609 | /* Setup the descriptor */ |
415f2287 HZ |
610 | desc.type = type; /* VmbusPacketTypeDataInBand; */ |
611 | desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ | |
f4266e34 | 612 | /* in 8-bytes granularity */ |
415f2287 HZ |
613 | desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; |
614 | desc.len8 = (u16)(packetlen_aligned >> 3); | |
615 | desc.trans_id = requestid; | |
3e7ee490 | 616 | |
39d70a4a HZ |
617 | sg_init_table(bufferlist, 3); |
618 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); | |
619 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
620 | sg_set_buf(&bufferlist[2], &aligned_data, | |
621 | packetlen_aligned - packetlen); | |
3e7ee490 | 622 | |
633c4dce | 623 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 624 | |
decc49da | 625 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 626 | vmbus_setevent(channel); |
3e7ee490 | 627 | |
3e7ee490 HJ |
628 | return ret; |
629 | } | |
fff41b2e | 630 | EXPORT_SYMBOL(vmbus_sendpacket); |
3e7ee490 | 631 | |
3e189519 | 632 | /* |
fff41b2e | 633 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
3e189519 | 634 | * packets using a GPADL Direct packet type. |
f4266e34 | 635 | */ |
fff41b2e | 636 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
637 | struct hv_page_buffer pagebuffers[], |
638 | u32 pagecount, void *buffer, u32 bufferlen, | |
639 | u64 requestid) | |
3e7ee490 | 640 | { |
f4266e34 GKH |
641 | int ret; |
642 | int i; | |
430a8e9a | 643 | struct vmbus_channel_packet_page_buffer desc; |
39d70a4a HZ |
644 | u32 descsize; |
645 | u32 packetlen; | |
646 | u32 packetlen_aligned; | |
647 | struct scatterlist bufferlist[3]; | |
648 | u64 aligned_data = 0; | |
3e7ee490 | 649 | |
39d70a4a | 650 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
002b53ea | 651 | return -EINVAL; |
3e7ee490 | 652 | |
3e7ee490 | 653 | |
f4266e34 | 654 | /* |
430a8e9a | 655 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
f4266e34 GKH |
656 | * largest size we support |
657 | */ | |
39d70a4a HZ |
658 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
659 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * | |
f4266e34 | 660 | sizeof(struct hv_page_buffer)); |
39d70a4a | 661 | packetlen = descsize + bufferlen; |
73509681 | 662 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 663 | |
454f18a9 | 664 | /* Setup the descriptor */ |
415f2287 | 665 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 666 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
667 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
668 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
669 | desc.transactionid = requestid; | |
670 | desc.rangecount = pagecount; | |
671 | ||
672 | for (i = 0; i < pagecount; i++) { | |
ca623ad3 HZ |
673 | desc.range[i].len = pagebuffers[i].len; |
674 | desc.range[i].offset = pagebuffers[i].offset; | |
675 | desc.range[i].pfn = pagebuffers[i].pfn; | |
3e7ee490 HJ |
676 | } |
677 | ||
39d70a4a HZ |
678 | sg_init_table(bufferlist, 3); |
679 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
680 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
681 | sg_set_buf(&bufferlist[2], &aligned_data, | |
682 | packetlen_aligned - packetlen); | |
3e7ee490 | 683 | |
633c4dce | 684 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 685 | |
decc49da | 686 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 687 | vmbus_setevent(channel); |
3e7ee490 | 688 | |
3e7ee490 HJ |
689 | return ret; |
690 | } | |
713efeb4 | 691 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
3e7ee490 | 692 | |
3e189519 | 693 | /* |
fff41b2e | 694 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
3e189519 | 695 | * using a GPADL Direct packet type. |
f4266e34 | 696 | */ |
fff41b2e | 697 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
39d70a4a HZ |
698 | struct hv_multipage_buffer *multi_pagebuffer, |
699 | void *buffer, u32 bufferlen, u64 requestid) | |
3e7ee490 | 700 | { |
f4266e34 | 701 | int ret; |
430a8e9a | 702 | struct vmbus_channel_packet_multipage_buffer desc; |
39d70a4a HZ |
703 | u32 descsize; |
704 | u32 packetlen; | |
705 | u32 packetlen_aligned; | |
706 | struct scatterlist bufferlist[3]; | |
707 | u64 aligned_data = 0; | |
ca623ad3 HZ |
708 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, |
709 | multi_pagebuffer->len); | |
3e7ee490 | 710 | |
3e7ee490 | 711 | |
39d70a4a | 712 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
002b53ea | 713 | return -EINVAL; |
3e7ee490 | 714 | |
f4266e34 | 715 | /* |
430a8e9a | 716 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
f4266e34 GKH |
717 | * the largest size we support |
718 | */ | |
39d70a4a HZ |
719 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
720 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * | |
f4266e34 | 721 | sizeof(u64)); |
39d70a4a | 722 | packetlen = descsize + bufferlen; |
73509681 | 723 | packetlen_aligned = ALIGN(packetlen, sizeof(u64)); |
3e7ee490 | 724 | |
3e7ee490 | 725 | |
454f18a9 | 726 | /* Setup the descriptor */ |
415f2287 | 727 | desc.type = VM_PKT_DATA_USING_GPA_DIRECT; |
430a8e9a | 728 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
39d70a4a HZ |
729 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
730 | desc.length8 = (u16)(packetlen_aligned >> 3); | |
731 | desc.transactionid = requestid; | |
430a8e9a | 732 | desc.rangecount = 1; |
3e7ee490 | 733 | |
ca623ad3 HZ |
734 | desc.range.len = multi_pagebuffer->len; |
735 | desc.range.offset = multi_pagebuffer->offset; | |
3e7ee490 | 736 | |
ca623ad3 | 737 | memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, |
39d70a4a | 738 | pfncount * sizeof(u64)); |
3e7ee490 | 739 | |
39d70a4a HZ |
740 | sg_init_table(bufferlist, 3); |
741 | sg_set_buf(&bufferlist[0], &desc, descsize); | |
742 | sg_set_buf(&bufferlist[1], buffer, bufferlen); | |
743 | sg_set_buf(&bufferlist[2], &aligned_data, | |
744 | packetlen_aligned - packetlen); | |
3e7ee490 | 745 | |
633c4dce | 746 | ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3); |
3e7ee490 | 747 | |
decc49da | 748 | if (ret == 0 && !hv_get_ringbuffer_interrupt_mask(&channel->outbound)) |
fff41b2e | 749 | vmbus_setevent(channel); |
3e7ee490 | 750 | |
3e7ee490 HJ |
751 | return ret; |
752 | } | |
4cb106fa | 753 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
c88c4e4c HJ |
754 | |
755 | /** | |
fff41b2e | 756 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
39d70a4a HZ |
757 | * @channel: Pointer to vmbus_channel structure. |
758 | * @buffer: Pointer to the buffer you want to receive the data into. | |
759 | * @bufferlen: Maximum size of what the the buffer will hold | |
760 | * @buffer_actual_len: The actual size of the data after it was received | |
761 | * @requestid: Identifier of the request | |
c88c4e4c HJ |
762 | * |
763 | * Receives directly from the hyper-v vmbus and puts the data it received | |
764 | * into Buffer. This will receive the data unparsed from hyper-v. | |
765 | * | |
766 | * Mainly used by Hyper-V drivers. | |
f4266e34 | 767 | */ |
fff41b2e | 768 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
39d70a4a | 769 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
3e7ee490 | 770 | { |
8dc0a06a | 771 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
772 | u32 packetlen; |
773 | u32 userlen; | |
3e7ee490 | 774 | int ret; |
54411c42 | 775 | unsigned long flags; |
3e7ee490 | 776 | |
39d70a4a HZ |
777 | *buffer_actual_len = 0; |
778 | *requestid = 0; | |
3e7ee490 | 779 | |
39d70a4a | 780 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 781 | |
a89186c2 | 782 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
783 | sizeof(struct vmpacket_descriptor)); |
784 | if (ret != 0) { | |
39d70a4a | 785 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
786 | return 0; |
787 | } | |
788 | ||
415f2287 HZ |
789 | packetlen = desc.len8 << 3; |
790 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 791 | |
39d70a4a | 792 | *buffer_actual_len = userlen; |
3e7ee490 | 793 | |
39d70a4a HZ |
794 | if (userlen > bufferlen) { |
795 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 796 | |
0a46618d | 797 | pr_err("Buffer too small - got %d needs %d\n", |
39d70a4a | 798 | bufferlen, userlen); |
3e7ee490 HJ |
799 | return -1; |
800 | } | |
801 | ||
415f2287 | 802 | *requestid = desc.trans_id; |
3e7ee490 | 803 | |
454f18a9 | 804 | /* Copy over the packet to the user buffer */ |
38397c8a | 805 | ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, |
415f2287 | 806 | (desc.offset8 << 3)); |
3e7ee490 | 807 | |
39d70a4a | 808 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 | 809 | |
3e7ee490 HJ |
810 | return 0; |
811 | } | |
fff41b2e | 812 | EXPORT_SYMBOL(vmbus_recvpacket); |
3e7ee490 | 813 | |
3e189519 | 814 | /* |
fff41b2e | 815 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
f4266e34 | 816 | */ |
fff41b2e | 817 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
39d70a4a HZ |
818 | u32 bufferlen, u32 *buffer_actual_len, |
819 | u64 *requestid) | |
3e7ee490 | 820 | { |
8dc0a06a | 821 | struct vmpacket_descriptor desc; |
39d70a4a HZ |
822 | u32 packetlen; |
823 | u32 userlen; | |
3e7ee490 | 824 | int ret; |
54411c42 | 825 | unsigned long flags; |
3e7ee490 | 826 | |
39d70a4a HZ |
827 | *buffer_actual_len = 0; |
828 | *requestid = 0; | |
3e7ee490 | 829 | |
39d70a4a | 830 | spin_lock_irqsave(&channel->inbound_lock, flags); |
3e7ee490 | 831 | |
a89186c2 | 832 | ret = hv_ringbuffer_peek(&channel->inbound, &desc, |
f4266e34 GKH |
833 | sizeof(struct vmpacket_descriptor)); |
834 | if (ret != 0) { | |
39d70a4a | 835 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
836 | return 0; |
837 | } | |
838 | ||
3e7ee490 | 839 | |
415f2287 HZ |
840 | packetlen = desc.len8 << 3; |
841 | userlen = packetlen - (desc.offset8 << 3); | |
3e7ee490 | 842 | |
39d70a4a | 843 | *buffer_actual_len = packetlen; |
3e7ee490 | 844 | |
39d70a4a HZ |
845 | if (packetlen > bufferlen) { |
846 | spin_unlock_irqrestore(&channel->inbound_lock, flags); | |
3e7ee490 | 847 | |
0a46618d HJ |
848 | pr_err("Buffer too small - needed %d bytes but " |
849 | "got space for only %d bytes\n", | |
850 | packetlen, bufferlen); | |
3e7ee490 HJ |
851 | return -2; |
852 | } | |
853 | ||
415f2287 | 854 | *requestid = desc.trans_id; |
3e7ee490 | 855 | |
454f18a9 | 856 | /* Copy over the entire packet to the user buffer */ |
38397c8a | 857 | ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
3e7ee490 | 858 | |
39d70a4a | 859 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
3e7ee490 HJ |
860 | return 0; |
861 | } | |
adaee6bd | 862 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |