| 1 | /* |
| 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> |
| 20 | */ |
| 21 | #include <linux/kernel.h> |
| 22 | #include <linux/mm.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/module.h> |
| 25 | #include "osd.h" |
| 26 | #include "logging.h" |
| 27 | #include "vmbus_private.h" |
| 28 | |
| 29 | /* Internal routines */ |
| 30 | static int create_gpadl_header( |
| 31 | void *kbuffer, /* must be phys and virt contiguous */ |
| 32 | u32 size, /* page-size multiple */ |
| 33 | struct vmbus_channel_msginfo **msginfo, |
| 34 | u32 *messagecount); |
| 35 | static void dump_vmbus_channel(struct vmbus_channel *channel); |
| 36 | static void vmbus_setevent(struct vmbus_channel *channel); |
| 37 | |
| 38 | |
| 39 | #if 0 |
| 40 | static void DumpMonitorPage(struct hv_monitor_page *MonitorPage) |
| 41 | { |
| 42 | int i = 0; |
| 43 | int j = 0; |
| 44 | |
| 45 | DPRINT_DBG(VMBUS, "monitorPage - %p, trigger state - %d", |
| 46 | MonitorPage, MonitorPage->trigger_state); |
| 47 | |
| 48 | for (i = 0; i < 4; i++) |
| 49 | DPRINT_DBG(VMBUS, "trigger group (%d) - %llx", i, |
| 50 | MonitorPage->trigger_group[i].as_uint64); |
| 51 | |
| 52 | for (i = 0; i < 4; i++) { |
| 53 | for (j = 0; j < 32; j++) { |
| 54 | DPRINT_DBG(VMBUS, "latency (%d)(%d) - %llx", i, j, |
| 55 | MonitorPage->latency[i][j]); |
| 56 | } |
| 57 | } |
| 58 | for (i = 0; i < 4; i++) { |
| 59 | for (j = 0; j < 32; j++) { |
| 60 | DPRINT_DBG(VMBUS, "param-conn id (%d)(%d) - %d", i, j, |
| 61 | MonitorPage->parameter[i][j].connectionid.asu32); |
| 62 | DPRINT_DBG(VMBUS, "param-flag (%d)(%d) - %d", i, j, |
| 63 | MonitorPage->parameter[i][j].flag_number); |
| 64 | } |
| 65 | } |
| 66 | } |
| 67 | #endif |
| 68 | |
| 69 | /* |
| 70 | * vmbus_setevent- Trigger an event notification on the specified |
| 71 | * channel. |
| 72 | */ |
| 73 | static void vmbus_setevent(struct vmbus_channel *channel) |
| 74 | { |
| 75 | struct hv_monitor_page *monitorpage; |
| 76 | |
| 77 | if (channel->offermsg.monitor_allocated) { |
| 78 | /* Each u32 represents 32 channels */ |
| 79 | set_bit(channel->offermsg.child_relid & 31, |
| 80 | (unsigned long *) gVmbusConnection.SendInterruptPage + |
| 81 | (channel->offermsg.child_relid >> 5)); |
| 82 | |
| 83 | monitorpage = gVmbusConnection.MonitorPages; |
| 84 | monitorpage++; /* Get the child to parent monitor page */ |
| 85 | |
| 86 | set_bit(channel->monitor_bit, |
| 87 | (unsigned long *)&monitorpage->trigger_group |
| 88 | [channel->monitor_grp].pending); |
| 89 | |
| 90 | } else { |
| 91 | VmbusSetEvent(channel->offermsg.child_relid); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | #if 0 |
| 96 | static void VmbusChannelClearEvent(struct vmbus_channel *channel) |
| 97 | { |
| 98 | struct hv_monitor_page *monitorPage; |
| 99 | |
| 100 | if (Channel->offermsg.monitor_allocated) { |
| 101 | /* Each u32 represents 32 channels */ |
| 102 | clear_bit(Channel->offermsg.child_relid & 31, |
| 103 | (unsigned long *)gVmbusConnection.SendInterruptPage + |
| 104 | (Channel->offermsg.child_relid >> 5)); |
| 105 | |
| 106 | monitorPage = |
| 107 | (struct hv_monitor_page *)gVmbusConnection.MonitorPages; |
| 108 | monitorPage++; /* Get the child to parent monitor page */ |
| 109 | |
| 110 | clear_bit(Channel->monitor_bit, |
| 111 | (unsigned long *)&monitorPage->trigger_group |
| 112 | [Channel->monitor_grp].Pending); |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | #endif |
| 117 | /* |
| 118 | * vmbus_get_debug_info -Retrieve various channel debug info |
| 119 | */ |
| 120 | void vmbus_get_debug_info(struct vmbus_channel *channel, |
| 121 | struct vmbus_channel_debug_info *debuginfo) |
| 122 | { |
| 123 | struct hv_monitor_page *monitorpage; |
| 124 | u8 monitor_group = (u8)channel->offermsg.monitorid / 32; |
| 125 | u8 monitor_offset = (u8)channel->offermsg.monitorid % 32; |
| 126 | /* u32 monitorBit = 1 << monitorOffset; */ |
| 127 | |
| 128 | debuginfo->relid = channel->offermsg.child_relid; |
| 129 | debuginfo->state = channel->state; |
| 130 | memcpy(&debuginfo->interfacetype, |
| 131 | &channel->offermsg.offer.InterfaceType, sizeof(struct hv_guid)); |
| 132 | memcpy(&debuginfo->interface_instance, |
| 133 | &channel->offermsg.offer.InterfaceInstance, |
| 134 | sizeof(struct hv_guid)); |
| 135 | |
| 136 | monitorpage = (struct hv_monitor_page *)gVmbusConnection.MonitorPages; |
| 137 | |
| 138 | debuginfo->monitorid = channel->offermsg.monitorid; |
| 139 | |
| 140 | debuginfo->servermonitor_pending = |
| 141 | monitorpage->trigger_group[monitor_group].pending; |
| 142 | debuginfo->servermonitor_latency = |
| 143 | monitorpage->latency[monitor_group][monitor_offset]; |
| 144 | debuginfo->servermonitor_connectionid = |
| 145 | monitorpage->parameter[monitor_group] |
| 146 | [monitor_offset].connectionid.u.id; |
| 147 | |
| 148 | monitorpage++; |
| 149 | |
| 150 | debuginfo->clientmonitor_pending = |
| 151 | monitorpage->trigger_group[monitor_group].pending; |
| 152 | debuginfo->clientmonitor_latency = |
| 153 | monitorpage->latency[monitor_group][monitor_offset]; |
| 154 | debuginfo->clientmonitor_connectionid = |
| 155 | monitorpage->parameter[monitor_group] |
| 156 | [monitor_offset].connectionid.u.id; |
| 157 | |
| 158 | ringbuffer_get_debuginfo(&channel->inbound, &debuginfo->inbound); |
| 159 | ringbuffer_get_debuginfo(&channel->outbound, &debuginfo->outbound); |
| 160 | } |
| 161 | |
| 162 | /* |
| 163 | * vmbus_open - Open the specified channel. |
| 164 | */ |
| 165 | int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, |
| 166 | u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, |
| 167 | void (*onchannelcallback)(void *context), void *context) |
| 168 | { |
| 169 | struct vmbus_channel_open_channel *openMsg; |
| 170 | struct vmbus_channel_msginfo *openInfo = NULL; |
| 171 | void *in, *out; |
| 172 | unsigned long flags; |
| 173 | int ret, err = 0; |
| 174 | |
| 175 | /* Aligned to page size */ |
| 176 | /* ASSERT(!(SendRingBufferSize & (PAGE_SIZE - 1))); */ |
| 177 | /* ASSERT(!(RecvRingBufferSize & (PAGE_SIZE - 1))); */ |
| 178 | |
| 179 | newchannel->onchannel_callback = onchannelcallback; |
| 180 | newchannel->channel_callback_context = context; |
| 181 | |
| 182 | /* Allocate the ring buffer */ |
| 183 | out = osd_page_alloc((send_ringbuffer_size + recv_ringbuffer_size) |
| 184 | >> PAGE_SHIFT); |
| 185 | if (!out) |
| 186 | return -ENOMEM; |
| 187 | |
| 188 | /* ASSERT(((unsigned long)out & (PAGE_SIZE-1)) == 0); */ |
| 189 | |
| 190 | in = (void *)((unsigned long)out + send_ringbuffer_size); |
| 191 | |
| 192 | newchannel->ringbuffer_pages = out; |
| 193 | newchannel->ringbuffer_pagecount = (send_ringbuffer_size + |
| 194 | recv_ringbuffer_size) >> PAGE_SHIFT; |
| 195 | |
| 196 | ret = ringbuffer_init(&newchannel->outbound, out, send_ringbuffer_size); |
| 197 | if (ret != 0) { |
| 198 | err = ret; |
| 199 | goto errorout; |
| 200 | } |
| 201 | |
| 202 | ret = ringbuffer_init(&newchannel->inbound, in, recv_ringbuffer_size); |
| 203 | if (ret != 0) { |
| 204 | err = ret; |
| 205 | goto errorout; |
| 206 | } |
| 207 | |
| 208 | |
| 209 | /* Establish the gpadl for the ring buffer */ |
| 210 | DPRINT_DBG(VMBUS, "Establishing ring buffer's gpadl for channel %p...", |
| 211 | newchannel); |
| 212 | |
| 213 | newchannel->ringbuffer_gpadlhandle = 0; |
| 214 | |
| 215 | ret = vmbus_establish_gpadl(newchannel, |
| 216 | newchannel->outbound.ring_buffer, |
| 217 | send_ringbuffer_size + |
| 218 | recv_ringbuffer_size, |
| 219 | &newchannel->ringbuffer_gpadlhandle); |
| 220 | |
| 221 | if (ret != 0) { |
| 222 | err = ret; |
| 223 | goto errorout; |
| 224 | } |
| 225 | |
| 226 | DPRINT_DBG(VMBUS, "channel %p <relid %d gpadl 0x%x send ring %p " |
| 227 | "size %d recv ring %p size %d, downstreamoffset %d>", |
| 228 | newchannel, newchannel->offermsg.child_relid, |
| 229 | newchannel->ringbuffer_gpadlhandle, |
| 230 | newchannel->outbound.ring_buffer, |
| 231 | newchannel->outbound.ring_size, |
| 232 | newchannel->inbound.ring_buffer, |
| 233 | newchannel->inbound.ring_size, |
| 234 | send_ringbuffer_size); |
| 235 | |
| 236 | /* Create and init the channel open message */ |
| 237 | openInfo = kmalloc(sizeof(*openInfo) + |
| 238 | sizeof(struct vmbus_channel_open_channel), |
| 239 | GFP_KERNEL); |
| 240 | if (!openInfo) { |
| 241 | err = -ENOMEM; |
| 242 | goto errorout; |
| 243 | } |
| 244 | |
| 245 | openInfo->waitevent = osd_waitevent_create(); |
| 246 | if (!openInfo->waitevent) { |
| 247 | err = -ENOMEM; |
| 248 | goto errorout; |
| 249 | } |
| 250 | |
| 251 | openMsg = (struct vmbus_channel_open_channel *)openInfo->msg; |
| 252 | openMsg->header.msgtype = CHANNELMSG_OPENCHANNEL; |
| 253 | openMsg->openid = newchannel->offermsg.child_relid; /* FIXME */ |
| 254 | openMsg->child_relid = newchannel->offermsg.child_relid; |
| 255 | openMsg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; |
| 256 | openMsg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> |
| 257 | PAGE_SHIFT; |
| 258 | openMsg->server_contextarea_gpadlhandle = 0; /* TODO */ |
| 259 | |
| 260 | if (userdatalen > MAX_USER_DEFINED_BYTES) { |
| 261 | err = -EINVAL; |
| 262 | goto errorout; |
| 263 | } |
| 264 | |
| 265 | if (userdatalen) |
| 266 | memcpy(openMsg->userdata, userdata, userdatalen); |
| 267 | |
| 268 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 269 | list_add_tail(&openInfo->msglistentry, |
| 270 | &gVmbusConnection.ChannelMsgList); |
| 271 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 272 | |
| 273 | DPRINT_DBG(VMBUS, "Sending channel open msg..."); |
| 274 | |
| 275 | ret = VmbusPostMessage(openMsg, |
| 276 | sizeof(struct vmbus_channel_open_channel)); |
| 277 | if (ret != 0) { |
| 278 | DPRINT_ERR(VMBUS, "unable to open channel - %d", ret); |
| 279 | goto Cleanup; |
| 280 | } |
| 281 | |
| 282 | /* FIXME: Need to time-out here */ |
| 283 | osd_waitevent_wait(openInfo->waitevent); |
| 284 | |
| 285 | if (openInfo->response.open_result.status == 0) |
| 286 | DPRINT_INFO(VMBUS, "channel <%p> open success!!", newchannel); |
| 287 | else |
| 288 | DPRINT_INFO(VMBUS, "channel <%p> open failed - %d!!", |
| 289 | newchannel, openInfo->response.open_result.status); |
| 290 | |
| 291 | Cleanup: |
| 292 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 293 | list_del(&openInfo->msglistentry); |
| 294 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 295 | |
| 296 | kfree(openInfo->waitevent); |
| 297 | kfree(openInfo); |
| 298 | return 0; |
| 299 | |
| 300 | errorout: |
| 301 | ringbuffer_cleanup(&newchannel->outbound); |
| 302 | ringbuffer_cleanup(&newchannel->inbound); |
| 303 | osd_page_free(out, (send_ringbuffer_size + recv_ringbuffer_size) |
| 304 | >> PAGE_SHIFT); |
| 305 | kfree(openInfo); |
| 306 | return err; |
| 307 | } |
| 308 | EXPORT_SYMBOL_GPL(vmbus_open); |
| 309 | |
| 310 | /* |
| 311 | * dump_gpadl_body - Dump the gpadl body message to the console for |
| 312 | * debugging purposes. |
| 313 | */ |
| 314 | static void dump_gpadl_body(struct vmbus_channel_gpadl_body *gpadl, u32 len) |
| 315 | { |
| 316 | int i; |
| 317 | int pfncount; |
| 318 | |
| 319 | pfncount = (len - sizeof(struct vmbus_channel_gpadl_body)) / |
| 320 | sizeof(u64); |
| 321 | DPRINT_DBG(VMBUS, "gpadl body - len %d pfn count %d", len, pfncount); |
| 322 | |
| 323 | for (i = 0; i < pfncount; i++) |
| 324 | DPRINT_DBG(VMBUS, "gpadl body - %d) pfn %llu", |
| 325 | i, gpadl->pfn[i]); |
| 326 | } |
| 327 | |
| 328 | /* |
| 329 | * dump_gpadl_header - Dump the gpadl header message to the console for |
| 330 | * debugging purposes. |
| 331 | */ |
| 332 | static void dump_gpadl_header(struct vmbus_channel_gpadl_header *gpadl) |
| 333 | { |
| 334 | int i, j; |
| 335 | int pagecount; |
| 336 | |
| 337 | DPRINT_DBG(VMBUS, |
| 338 | "gpadl header - relid %d, range count %d, range buflen %d", |
| 339 | gpadl->child_relid, gpadl->rangecount, gpadl->range_buflen); |
| 340 | for (i = 0; i < gpadl->rangecount; i++) { |
| 341 | pagecount = gpadl->range[i].ByteCount >> PAGE_SHIFT; |
| 342 | pagecount = (pagecount > 26) ? 26 : pagecount; |
| 343 | |
| 344 | DPRINT_DBG(VMBUS, "gpadl range %d - len %d offset %d " |
| 345 | "page count %d", i, gpadl->range[i].ByteCount, |
| 346 | gpadl->range[i].ByteOffset, pagecount); |
| 347 | |
| 348 | for (j = 0; j < pagecount; j++) |
| 349 | DPRINT_DBG(VMBUS, "%d) pfn %llu", j, |
| 350 | gpadl->range[i].PfnArray[j]); |
| 351 | } |
| 352 | } |
| 353 | |
| 354 | /* |
| 355 | * create_gpadl_header - Creates a gpadl for the specified buffer |
| 356 | */ |
| 357 | static int create_gpadl_header(void *kbuffer, u32 size, |
| 358 | struct vmbus_channel_msginfo **msginfo, |
| 359 | u32 *messagecount) |
| 360 | { |
| 361 | int i; |
| 362 | int pagecount; |
| 363 | unsigned long long pfn; |
| 364 | struct vmbus_channel_gpadl_header *gpadl_header; |
| 365 | struct vmbus_channel_gpadl_body *gpadl_body; |
| 366 | struct vmbus_channel_msginfo *msgheader; |
| 367 | struct vmbus_channel_msginfo *msgbody = NULL; |
| 368 | u32 msgsize; |
| 369 | |
| 370 | int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; |
| 371 | |
| 372 | /* ASSERT((kbuffer & (PAGE_SIZE-1)) == 0); */ |
| 373 | /* ASSERT((Size & (PAGE_SIZE-1)) == 0); */ |
| 374 | |
| 375 | pagecount = size >> PAGE_SHIFT; |
| 376 | pfn = virt_to_phys(kbuffer) >> PAGE_SHIFT; |
| 377 | |
| 378 | /* do we need a gpadl body msg */ |
| 379 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| 380 | sizeof(struct vmbus_channel_gpadl_header) - |
| 381 | sizeof(struct gpa_range); |
| 382 | pfncount = pfnsize / sizeof(u64); |
| 383 | |
| 384 | if (pagecount > pfncount) { |
| 385 | /* we need a gpadl body */ |
| 386 | /* fill in the header */ |
| 387 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 388 | sizeof(struct vmbus_channel_gpadl_header) + |
| 389 | sizeof(struct gpa_range) + pfncount * sizeof(u64); |
| 390 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| 391 | if (!msgheader) |
| 392 | goto nomem; |
| 393 | |
| 394 | INIT_LIST_HEAD(&msgheader->submsglist); |
| 395 | msgheader->msgsize = msgsize; |
| 396 | |
| 397 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| 398 | msgheader->msg; |
| 399 | gpadl_header->rangecount = 1; |
| 400 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| 401 | pagecount * sizeof(u64); |
| 402 | gpadl_header->range[0].ByteOffset = 0; |
| 403 | gpadl_header->range[0].ByteCount = size; |
| 404 | for (i = 0; i < pfncount; i++) |
| 405 | gpadl_header->range[0].PfnArray[i] = pfn+i; |
| 406 | *msginfo = msgheader; |
| 407 | *messagecount = 1; |
| 408 | |
| 409 | pfnsum = pfncount; |
| 410 | pfnleft = pagecount - pfncount; |
| 411 | |
| 412 | /* how many pfns can we fit */ |
| 413 | pfnsize = MAX_SIZE_CHANNEL_MESSAGE - |
| 414 | sizeof(struct vmbus_channel_gpadl_body); |
| 415 | pfncount = pfnsize / sizeof(u64); |
| 416 | |
| 417 | /* fill in the body */ |
| 418 | while (pfnleft) { |
| 419 | if (pfnleft > pfncount) |
| 420 | pfncurr = pfncount; |
| 421 | else |
| 422 | pfncurr = pfnleft; |
| 423 | |
| 424 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 425 | sizeof(struct vmbus_channel_gpadl_body) + |
| 426 | pfncurr * sizeof(u64); |
| 427 | msgbody = kzalloc(msgsize, GFP_KERNEL); |
| 428 | /* FIXME: we probably need to more if this fails */ |
| 429 | if (!msgbody) |
| 430 | goto nomem; |
| 431 | msgbody->msgsize = msgsize; |
| 432 | (*messagecount)++; |
| 433 | gpadl_body = |
| 434 | (struct vmbus_channel_gpadl_body *)msgbody->msg; |
| 435 | |
| 436 | /* |
| 437 | * FIXME: |
| 438 | * Gpadl is u32 and we are using a pointer which could |
| 439 | * be 64-bit |
| 440 | */ |
| 441 | /* gpadl_body->Gpadl = kbuffer; */ |
| 442 | for (i = 0; i < pfncurr; i++) |
| 443 | gpadl_body->pfn[i] = pfn + pfnsum + i; |
| 444 | |
| 445 | /* add to msg header */ |
| 446 | list_add_tail(&msgbody->msglistentry, |
| 447 | &msgheader->submsglist); |
| 448 | pfnsum += pfncurr; |
| 449 | pfnleft -= pfncurr; |
| 450 | } |
| 451 | } else { |
| 452 | /* everything fits in a header */ |
| 453 | msgsize = sizeof(struct vmbus_channel_msginfo) + |
| 454 | sizeof(struct vmbus_channel_gpadl_header) + |
| 455 | sizeof(struct gpa_range) + pagecount * sizeof(u64); |
| 456 | msgheader = kzalloc(msgsize, GFP_KERNEL); |
| 457 | if (msgheader == NULL) |
| 458 | goto nomem; |
| 459 | msgheader->msgsize = msgsize; |
| 460 | |
| 461 | gpadl_header = (struct vmbus_channel_gpadl_header *) |
| 462 | msgheader->msg; |
| 463 | gpadl_header->rangecount = 1; |
| 464 | gpadl_header->range_buflen = sizeof(struct gpa_range) + |
| 465 | pagecount * sizeof(u64); |
| 466 | gpadl_header->range[0].ByteOffset = 0; |
| 467 | gpadl_header->range[0].ByteCount = size; |
| 468 | for (i = 0; i < pagecount; i++) |
| 469 | gpadl_header->range[0].PfnArray[i] = pfn+i; |
| 470 | |
| 471 | *msginfo = msgheader; |
| 472 | *messagecount = 1; |
| 473 | } |
| 474 | |
| 475 | return 0; |
| 476 | nomem: |
| 477 | kfree(msgheader); |
| 478 | kfree(msgbody); |
| 479 | return -ENOMEM; |
| 480 | } |
| 481 | |
| 482 | /* |
| 483 | * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer |
| 484 | * |
| 485 | * @channel: a channel |
| 486 | * @kbuffer: from kmalloc |
| 487 | * @size: page-size multiple |
| 488 | * @gpadl_handle: some funky thing |
| 489 | */ |
| 490 | int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, |
| 491 | u32 size, u32 *gpadl_handle) |
| 492 | { |
| 493 | struct vmbus_channel_gpadl_header *gpadlmsg; |
| 494 | struct vmbus_channel_gpadl_body *gpadl_body; |
| 495 | /* struct vmbus_channel_gpadl_created *gpadlCreated; */ |
| 496 | struct vmbus_channel_msginfo *msginfo = NULL; |
| 497 | struct vmbus_channel_msginfo *submsginfo; |
| 498 | u32 msgcount; |
| 499 | struct list_head *curr; |
| 500 | u32 next_gpadl_handle; |
| 501 | unsigned long flags; |
| 502 | int ret = 0; |
| 503 | |
| 504 | next_gpadl_handle = atomic_read(&gVmbusConnection.NextGpadlHandle); |
| 505 | atomic_inc(&gVmbusConnection.NextGpadlHandle); |
| 506 | |
| 507 | ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); |
| 508 | if (ret) |
| 509 | return ret; |
| 510 | |
| 511 | msginfo->waitevent = osd_waitevent_create(); |
| 512 | if (!msginfo->waitevent) { |
| 513 | ret = -ENOMEM; |
| 514 | goto Cleanup; |
| 515 | } |
| 516 | |
| 517 | gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; |
| 518 | gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; |
| 519 | gpadlmsg->child_relid = channel->offermsg.child_relid; |
| 520 | gpadlmsg->gpadl = next_gpadl_handle; |
| 521 | |
| 522 | dump_gpadl_header(gpadlmsg); |
| 523 | |
| 524 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 525 | list_add_tail(&msginfo->msglistentry, |
| 526 | &gVmbusConnection.ChannelMsgList); |
| 527 | |
| 528 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 529 | DPRINT_DBG(VMBUS, "buffer %p, size %d msg cnt %d", |
| 530 | kbuffer, size, msgcount); |
| 531 | |
| 532 | DPRINT_DBG(VMBUS, "Sending GPADL Header - len %zd", |
| 533 | msginfo->msgsize - sizeof(*msginfo)); |
| 534 | |
| 535 | ret = VmbusPostMessage(gpadlmsg, msginfo->msgsize - |
| 536 | sizeof(*msginfo)); |
| 537 | if (ret != 0) { |
| 538 | DPRINT_ERR(VMBUS, "Unable to open channel - %d", ret); |
| 539 | goto Cleanup; |
| 540 | } |
| 541 | |
| 542 | if (msgcount > 1) { |
| 543 | list_for_each(curr, &msginfo->submsglist) { |
| 544 | |
| 545 | /* FIXME: should this use list_entry() instead ? */ |
| 546 | submsginfo = (struct vmbus_channel_msginfo *)curr; |
| 547 | gpadl_body = |
| 548 | (struct vmbus_channel_gpadl_body *)submsginfo->msg; |
| 549 | |
| 550 | gpadl_body->header.msgtype = |
| 551 | CHANNELMSG_GPADL_BODY; |
| 552 | gpadl_body->gpadl = next_gpadl_handle; |
| 553 | |
| 554 | DPRINT_DBG(VMBUS, "Sending GPADL Body - len %zd", |
| 555 | submsginfo->msgsize - |
| 556 | sizeof(*submsginfo)); |
| 557 | |
| 558 | dump_gpadl_body(gpadl_body, submsginfo->msgsize - |
| 559 | sizeof(*submsginfo)); |
| 560 | ret = VmbusPostMessage(gpadl_body, |
| 561 | submsginfo->msgsize - |
| 562 | sizeof(*submsginfo)); |
| 563 | if (ret != 0) |
| 564 | goto Cleanup; |
| 565 | |
| 566 | } |
| 567 | } |
| 568 | osd_waitevent_wait(msginfo->waitevent); |
| 569 | |
| 570 | /* At this point, we received the gpadl created msg */ |
| 571 | DPRINT_DBG(VMBUS, "Received GPADL created " |
| 572 | "(relid %d, status %d handle %x)", |
| 573 | channel->offermsg.child_relid, |
| 574 | msginfo->response.gpadl_created.creation_status, |
| 575 | gpadlmsg->gpadl); |
| 576 | |
| 577 | *gpadl_handle = gpadlmsg->gpadl; |
| 578 | |
| 579 | Cleanup: |
| 580 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 581 | list_del(&msginfo->msglistentry); |
| 582 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 583 | |
| 584 | kfree(msginfo->waitevent); |
| 585 | kfree(msginfo); |
| 586 | return ret; |
| 587 | } |
| 588 | EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); |
| 589 | |
| 590 | /* |
| 591 | * vmbus_teardown_gpadl -Teardown the specified GPADL handle |
| 592 | */ |
| 593 | int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) |
| 594 | { |
| 595 | struct vmbus_channel_gpadl_teardown *msg; |
| 596 | struct vmbus_channel_msginfo *info; |
| 597 | unsigned long flags; |
| 598 | int ret; |
| 599 | |
| 600 | /* ASSERT(gpadl_handle != 0); */ |
| 601 | |
| 602 | info = kmalloc(sizeof(*info) + |
| 603 | sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); |
| 604 | if (!info) |
| 605 | return -ENOMEM; |
| 606 | |
| 607 | info->waitevent = osd_waitevent_create(); |
| 608 | if (!info->waitevent) { |
| 609 | kfree(info); |
| 610 | return -ENOMEM; |
| 611 | } |
| 612 | |
| 613 | msg = (struct vmbus_channel_gpadl_teardown *)info->msg; |
| 614 | |
| 615 | msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; |
| 616 | msg->child_relid = channel->offermsg.child_relid; |
| 617 | msg->gpadl = gpadl_handle; |
| 618 | |
| 619 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 620 | list_add_tail(&info->msglistentry, |
| 621 | &gVmbusConnection.ChannelMsgList); |
| 622 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 623 | |
| 624 | ret = VmbusPostMessage(msg, |
| 625 | sizeof(struct vmbus_channel_gpadl_teardown)); |
| 626 | if (ret != 0) { |
| 627 | /* TODO: */ |
| 628 | /* something... */ |
| 629 | } |
| 630 | |
| 631 | osd_waitevent_wait(info->waitevent); |
| 632 | |
| 633 | /* Received a torndown response */ |
| 634 | spin_lock_irqsave(&gVmbusConnection.channelmsg_lock, flags); |
| 635 | list_del(&info->msglistentry); |
| 636 | spin_unlock_irqrestore(&gVmbusConnection.channelmsg_lock, flags); |
| 637 | |
| 638 | kfree(info->waitevent); |
| 639 | kfree(info); |
| 640 | return ret; |
| 641 | } |
| 642 | EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); |
| 643 | |
| 644 | /* |
| 645 | * vmbus_close - Close the specified channel |
| 646 | */ |
| 647 | void vmbus_close(struct vmbus_channel *channel) |
| 648 | { |
| 649 | struct vmbus_channel_close_channel *msg; |
| 650 | struct vmbus_channel_msginfo *info; |
| 651 | unsigned long flags; |
| 652 | int ret; |
| 653 | |
| 654 | /* Stop callback and cancel the timer asap */ |
| 655 | channel->onchannel_callback = NULL; |
| 656 | del_timer_sync(&channel->poll_timer); |
| 657 | |
| 658 | /* Send a closing message */ |
| 659 | info = kmalloc(sizeof(*info) + |
| 660 | sizeof(struct vmbus_channel_close_channel), GFP_KERNEL); |
| 661 | /* FIXME: can't do anything other than return here because the |
| 662 | * function is void */ |
| 663 | if (!info) |
| 664 | return; |
| 665 | |
| 666 | /* info->waitEvent = osd_waitevent_create(); */ |
| 667 | |
| 668 | msg = (struct vmbus_channel_close_channel *)info->msg; |
| 669 | msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; |
| 670 | msg->child_relid = channel->offermsg.child_relid; |
| 671 | |
| 672 | ret = VmbusPostMessage(msg, sizeof(struct vmbus_channel_close_channel)); |
| 673 | if (ret != 0) { |
| 674 | /* TODO: */ |
| 675 | /* something... */ |
| 676 | } |
| 677 | |
| 678 | /* Tear down the gpadl for the channel's ring buffer */ |
| 679 | if (channel->ringbuffer_gpadlhandle) |
| 680 | vmbus_teardown_gpadl(channel, |
| 681 | channel->ringbuffer_gpadlhandle); |
| 682 | |
| 683 | /* TODO: Send a msg to release the childRelId */ |
| 684 | |
| 685 | /* Cleanup the ring buffers for this channel */ |
| 686 | ringbuffer_cleanup(&channel->outbound); |
| 687 | ringbuffer_cleanup(&channel->inbound); |
| 688 | |
| 689 | osd_page_free(channel->ringbuffer_pages, channel->ringbuffer_pagecount); |
| 690 | |
| 691 | kfree(info); |
| 692 | |
| 693 | /* |
| 694 | * If we are closing the channel during an error path in |
| 695 | * opening the channel, don't free the channel since the |
| 696 | * caller will free the channel |
| 697 | */ |
| 698 | |
| 699 | if (channel->state == CHANNEL_OPEN_STATE) { |
| 700 | spin_lock_irqsave(&gVmbusConnection.channel_lock, flags); |
| 701 | list_del(&channel->listentry); |
| 702 | spin_unlock_irqrestore(&gVmbusConnection.channel_lock, flags); |
| 703 | |
| 704 | free_channel(channel); |
| 705 | } |
| 706 | } |
| 707 | EXPORT_SYMBOL_GPL(vmbus_close); |
| 708 | |
| 709 | /** |
| 710 | * vmbus_sendpacket() - Send the specified buffer on the given channel |
| 711 | * @channel: Pointer to vmbus_channel structure. |
| 712 | * @buffer: Pointer to the buffer you want to receive the data into. |
| 713 | * @bufferlen: Maximum size of what the the buffer will hold |
| 714 | * @requestid: Identifier of the request |
| 715 | * @type: Type of packet that is being send e.g. negotiate, time |
| 716 | * packet etc. |
| 717 | * |
| 718 | * Sends data in @buffer directly to hyper-v via the vmbus |
| 719 | * This will send the data unparsed to hyper-v. |
| 720 | * |
| 721 | * Mainly used by Hyper-V drivers. |
| 722 | */ |
| 723 | int vmbus_sendpacket(struct vmbus_channel *channel, const void *buffer, |
| 724 | u32 bufferlen, u64 requestid, |
| 725 | enum vmbus_packet_type type, u32 flags) |
| 726 | { |
| 727 | struct vmpacket_descriptor desc; |
| 728 | u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; |
| 729 | u32 packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64)); |
| 730 | struct scatterlist bufferlist[3]; |
| 731 | u64 aligned_data = 0; |
| 732 | int ret; |
| 733 | |
| 734 | DPRINT_DBG(VMBUS, "channel %p buffer %p len %d", |
| 735 | channel, buffer, bufferlen); |
| 736 | |
| 737 | dump_vmbus_channel(channel); |
| 738 | |
| 739 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
| 740 | |
| 741 | /* Setup the descriptor */ |
| 742 | desc.Type = type; /* VmbusPacketTypeDataInBand; */ |
| 743 | desc.Flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ |
| 744 | /* in 8-bytes granularity */ |
| 745 | desc.DataOffset8 = sizeof(struct vmpacket_descriptor) >> 3; |
| 746 | desc.Length8 = (u16)(packetlen_aligned >> 3); |
| 747 | desc.TransactionId = requestid; |
| 748 | |
| 749 | sg_init_table(bufferlist, 3); |
| 750 | sg_set_buf(&bufferlist[0], &desc, sizeof(struct vmpacket_descriptor)); |
| 751 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 752 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 753 | packetlen_aligned - packetlen); |
| 754 | |
| 755 | ret = ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 756 | |
| 757 | /* TODO: We should determine if this is optional */ |
| 758 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 759 | vmbus_setevent(channel); |
| 760 | |
| 761 | return ret; |
| 762 | } |
| 763 | EXPORT_SYMBOL(vmbus_sendpacket); |
| 764 | |
| 765 | /* |
| 766 | * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer |
| 767 | * packets using a GPADL Direct packet type. |
| 768 | */ |
| 769 | int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, |
| 770 | struct hv_page_buffer pagebuffers[], |
| 771 | u32 pagecount, void *buffer, u32 bufferlen, |
| 772 | u64 requestid) |
| 773 | { |
| 774 | int ret; |
| 775 | int i; |
| 776 | struct vmbus_channel_packet_page_buffer desc; |
| 777 | u32 descsize; |
| 778 | u32 packetlen; |
| 779 | u32 packetlen_aligned; |
| 780 | struct scatterlist bufferlist[3]; |
| 781 | u64 aligned_data = 0; |
| 782 | |
| 783 | if (pagecount > MAX_PAGE_BUFFER_COUNT) |
| 784 | return -EINVAL; |
| 785 | |
| 786 | dump_vmbus_channel(channel); |
| 787 | |
| 788 | /* |
| 789 | * Adjust the size down since vmbus_channel_packet_page_buffer is the |
| 790 | * largest size we support |
| 791 | */ |
| 792 | descsize = sizeof(struct vmbus_channel_packet_page_buffer) - |
| 793 | ((MAX_PAGE_BUFFER_COUNT - pagecount) * |
| 794 | sizeof(struct hv_page_buffer)); |
| 795 | packetlen = descsize + bufferlen; |
| 796 | packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64)); |
| 797 | |
| 798 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
| 799 | |
| 800 | /* Setup the descriptor */ |
| 801 | desc.type = VmbusPacketTypeDataUsingGpaDirect; |
| 802 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 803 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| 804 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| 805 | desc.transactionid = requestid; |
| 806 | desc.rangecount = pagecount; |
| 807 | |
| 808 | for (i = 0; i < pagecount; i++) { |
| 809 | desc.range[i].Length = pagebuffers[i].Length; |
| 810 | desc.range[i].Offset = pagebuffers[i].Offset; |
| 811 | desc.range[i].Pfn = pagebuffers[i].Pfn; |
| 812 | } |
| 813 | |
| 814 | sg_init_table(bufferlist, 3); |
| 815 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| 816 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 817 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 818 | packetlen_aligned - packetlen); |
| 819 | |
| 820 | ret = ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 821 | |
| 822 | /* TODO: We should determine if this is optional */ |
| 823 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 824 | vmbus_setevent(channel); |
| 825 | |
| 826 | return ret; |
| 827 | } |
| 828 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); |
| 829 | |
| 830 | /* |
| 831 | * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet |
| 832 | * using a GPADL Direct packet type. |
| 833 | */ |
| 834 | int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, |
| 835 | struct hv_multipage_buffer *multi_pagebuffer, |
| 836 | void *buffer, u32 bufferlen, u64 requestid) |
| 837 | { |
| 838 | int ret; |
| 839 | struct vmbus_channel_packet_multipage_buffer desc; |
| 840 | u32 descsize; |
| 841 | u32 packetlen; |
| 842 | u32 packetlen_aligned; |
| 843 | struct scatterlist bufferlist[3]; |
| 844 | u64 aligned_data = 0; |
| 845 | u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->Offset, |
| 846 | multi_pagebuffer->Length); |
| 847 | |
| 848 | dump_vmbus_channel(channel); |
| 849 | |
| 850 | DPRINT_DBG(VMBUS, "data buffer - offset %u len %u pfn count %u", |
| 851 | multi_pagebuffer->Offset, |
| 852 | multi_pagebuffer->Length, pfncount); |
| 853 | |
| 854 | if ((pfncount < 0) || (pfncount > MAX_MULTIPAGE_BUFFER_COUNT)) |
| 855 | return -EINVAL; |
| 856 | |
| 857 | /* |
| 858 | * Adjust the size down since vmbus_channel_packet_multipage_buffer is |
| 859 | * the largest size we support |
| 860 | */ |
| 861 | descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - |
| 862 | ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * |
| 863 | sizeof(u64)); |
| 864 | packetlen = descsize + bufferlen; |
| 865 | packetlen_aligned = ALIGN_UP(packetlen, sizeof(u64)); |
| 866 | |
| 867 | /* ASSERT((packetLenAligned - packetLen) < sizeof(u64)); */ |
| 868 | |
| 869 | /* Setup the descriptor */ |
| 870 | desc.type = VmbusPacketTypeDataUsingGpaDirect; |
| 871 | desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; |
| 872 | desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ |
| 873 | desc.length8 = (u16)(packetlen_aligned >> 3); |
| 874 | desc.transactionid = requestid; |
| 875 | desc.rangecount = 1; |
| 876 | |
| 877 | desc.range.Length = multi_pagebuffer->Length; |
| 878 | desc.range.Offset = multi_pagebuffer->Offset; |
| 879 | |
| 880 | memcpy(desc.range.PfnArray, multi_pagebuffer->PfnArray, |
| 881 | pfncount * sizeof(u64)); |
| 882 | |
| 883 | sg_init_table(bufferlist, 3); |
| 884 | sg_set_buf(&bufferlist[0], &desc, descsize); |
| 885 | sg_set_buf(&bufferlist[1], buffer, bufferlen); |
| 886 | sg_set_buf(&bufferlist[2], &aligned_data, |
| 887 | packetlen_aligned - packetlen); |
| 888 | |
| 889 | ret = ringbuffer_write(&channel->outbound, bufferlist, 3); |
| 890 | |
| 891 | /* TODO: We should determine if this is optional */ |
| 892 | if (ret == 0 && !get_ringbuffer_interrupt_mask(&channel->outbound)) |
| 893 | vmbus_setevent(channel); |
| 894 | |
| 895 | return ret; |
| 896 | } |
| 897 | EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); |
| 898 | |
| 899 | /** |
| 900 | * vmbus_recvpacket() - Retrieve the user packet on the specified channel |
| 901 | * @channel: Pointer to vmbus_channel structure. |
| 902 | * @buffer: Pointer to the buffer you want to receive the data into. |
| 903 | * @bufferlen: Maximum size of what the the buffer will hold |
| 904 | * @buffer_actual_len: The actual size of the data after it was received |
| 905 | * @requestid: Identifier of the request |
| 906 | * |
| 907 | * Receives directly from the hyper-v vmbus and puts the data it received |
| 908 | * into Buffer. This will receive the data unparsed from hyper-v. |
| 909 | * |
| 910 | * Mainly used by Hyper-V drivers. |
| 911 | */ |
| 912 | int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, |
| 913 | u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) |
| 914 | { |
| 915 | struct vmpacket_descriptor desc; |
| 916 | u32 packetlen; |
| 917 | u32 userlen; |
| 918 | int ret; |
| 919 | unsigned long flags; |
| 920 | |
| 921 | *buffer_actual_len = 0; |
| 922 | *requestid = 0; |
| 923 | |
| 924 | spin_lock_irqsave(&channel->inbound_lock, flags); |
| 925 | |
| 926 | ret = ringbuffer_peek(&channel->inbound, &desc, |
| 927 | sizeof(struct vmpacket_descriptor)); |
| 928 | if (ret != 0) { |
| 929 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 930 | |
| 931 | /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ |
| 932 | return 0; |
| 933 | } |
| 934 | |
| 935 | /* VmbusChannelClearEvent(Channel); */ |
| 936 | |
| 937 | packetlen = desc.Length8 << 3; |
| 938 | userlen = packetlen - (desc.DataOffset8 << 3); |
| 939 | /* ASSERT(userLen > 0); */ |
| 940 | |
| 941 | DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " |
| 942 | "flag %d tid %llx pktlen %d datalen %d> ", |
| 943 | channel, channel->offermsg.child_relid, desc.Type, |
| 944 | desc.Flags, desc.TransactionId, packetlen, userlen); |
| 945 | |
| 946 | *buffer_actual_len = userlen; |
| 947 | |
| 948 | if (userlen > bufferlen) { |
| 949 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 950 | |
| 951 | DPRINT_ERR(VMBUS, "buffer too small - got %d needs %d", |
| 952 | bufferlen, userlen); |
| 953 | return -1; |
| 954 | } |
| 955 | |
| 956 | *requestid = desc.TransactionId; |
| 957 | |
| 958 | /* Copy over the packet to the user buffer */ |
| 959 | ret = ringbuffer_read(&channel->inbound, buffer, userlen, |
| 960 | (desc.DataOffset8 << 3)); |
| 961 | |
| 962 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 963 | |
| 964 | return 0; |
| 965 | } |
| 966 | EXPORT_SYMBOL(vmbus_recvpacket); |
| 967 | |
| 968 | /* |
| 969 | * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel |
| 970 | */ |
| 971 | int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, |
| 972 | u32 bufferlen, u32 *buffer_actual_len, |
| 973 | u64 *requestid) |
| 974 | { |
| 975 | struct vmpacket_descriptor desc; |
| 976 | u32 packetlen; |
| 977 | u32 userlen; |
| 978 | int ret; |
| 979 | unsigned long flags; |
| 980 | |
| 981 | *buffer_actual_len = 0; |
| 982 | *requestid = 0; |
| 983 | |
| 984 | spin_lock_irqsave(&channel->inbound_lock, flags); |
| 985 | |
| 986 | ret = ringbuffer_peek(&channel->inbound, &desc, |
| 987 | sizeof(struct vmpacket_descriptor)); |
| 988 | if (ret != 0) { |
| 989 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 990 | |
| 991 | /* DPRINT_DBG(VMBUS, "nothing to read!!"); */ |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | /* VmbusChannelClearEvent(Channel); */ |
| 996 | |
| 997 | packetlen = desc.Length8 << 3; |
| 998 | userlen = packetlen - (desc.DataOffset8 << 3); |
| 999 | |
| 1000 | DPRINT_DBG(VMBUS, "packet received on channel %p relid %d <type %d " |
| 1001 | "flag %d tid %llx pktlen %d datalen %d> ", |
| 1002 | channel, channel->offermsg.child_relid, desc.Type, |
| 1003 | desc.Flags, desc.TransactionId, packetlen, userlen); |
| 1004 | |
| 1005 | *buffer_actual_len = packetlen; |
| 1006 | |
| 1007 | if (packetlen > bufferlen) { |
| 1008 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 1009 | |
| 1010 | DPRINT_ERR(VMBUS, "buffer too small - needed %d bytes but " |
| 1011 | "got space for only %d bytes", packetlen, bufferlen); |
| 1012 | return -2; |
| 1013 | } |
| 1014 | |
| 1015 | *requestid = desc.TransactionId; |
| 1016 | |
| 1017 | /* Copy over the entire packet to the user buffer */ |
| 1018 | ret = ringbuffer_read(&channel->inbound, buffer, packetlen, 0); |
| 1019 | |
| 1020 | spin_unlock_irqrestore(&channel->inbound_lock, flags); |
| 1021 | return 0; |
| 1022 | } |
| 1023 | EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); |
| 1024 | |
| 1025 | /* |
| 1026 | * vmbus_onchannel_event - Channel event callback |
| 1027 | */ |
| 1028 | void vmbus_onchannel_event(struct vmbus_channel *channel) |
| 1029 | { |
| 1030 | dump_vmbus_channel(channel); |
| 1031 | /* ASSERT(Channel->OnChannelCallback); */ |
| 1032 | |
| 1033 | channel->onchannel_callback(channel->channel_callback_context); |
| 1034 | |
| 1035 | mod_timer(&channel->poll_timer, jiffies + usecs_to_jiffies(100)); |
| 1036 | } |
| 1037 | |
| 1038 | /* |
| 1039 | * vmbus_ontimer - Timer event callback |
| 1040 | */ |
| 1041 | void vmbus_ontimer(unsigned long data) |
| 1042 | { |
| 1043 | struct vmbus_channel *channel = (struct vmbus_channel *)data; |
| 1044 | |
| 1045 | if (channel->onchannel_callback) |
| 1046 | channel->onchannel_callback(channel->channel_callback_context); |
| 1047 | } |
| 1048 | |
| 1049 | /* |
| 1050 | * dump_vmbus_channel- Dump vmbus channel info to the console |
| 1051 | */ |
| 1052 | static void dump_vmbus_channel(struct vmbus_channel *channel) |
| 1053 | { |
| 1054 | DPRINT_DBG(VMBUS, "Channel (%d)", channel->offermsg.child_relid); |
| 1055 | dump_ring_info(&channel->outbound, "Outbound "); |
| 1056 | dump_ring_info(&channel->inbound, "Inbound "); |
| 1057 | } |