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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 22 23 #include <linux/kernel.h> 24 #include <linux/sched.h> 25 #include <linux/wait.h> 26 #include <linux/mm.h> 27 #include <linux/slab.h> 28 #include <linux/module.h> 29 #include <linux/hyperv.h> 30 #include <linux/uio.h> 31 32 #include "hyperv_vmbus.h" 33 34 #define NUM_PAGES_SPANNED(addr, len) \ 35 ((PAGE_ALIGN(addr + len) >> PAGE_SHIFT) - (addr >> PAGE_SHIFT)) 36 37 /* 38 * vmbus_setevent- Trigger an event notification on the specified 39 * channel. 40 */ 41 static void vmbus_setevent(struct vmbus_channel *channel) 42 { 43 struct hv_monitor_page *monitorpage; 44 45 if (channel->offermsg.monitor_allocated) { 46 /* Each u32 represents 32 channels */ 47 sync_set_bit(channel->offermsg.child_relid & 31, 48 (unsigned long *) vmbus_connection.send_int_page + 49 (channel->offermsg.child_relid >> 5)); 50 51 /* Get the child to parent monitor page */ 52 monitorpage = vmbus_connection.monitor_pages[1]; 53 54 sync_set_bit(channel->monitor_bit, 55 (unsigned long *)&monitorpage->trigger_group 56 [channel->monitor_grp].pending); 57 58 } else { 59 vmbus_set_event(channel); 60 } 61 } 62 63 /* 64 * vmbus_open - Open the specified channel. 65 */ 66 int vmbus_open(struct vmbus_channel *newchannel, u32 send_ringbuffer_size, 67 u32 recv_ringbuffer_size, void *userdata, u32 userdatalen, 68 void (*onchannelcallback)(void *context), void *context) 69 { 70 struct vmbus_channel_open_channel *open_msg; 71 struct vmbus_channel_msginfo *open_info = NULL; 72 void *in, *out; 73 unsigned long flags; 74 int ret, t, err = 0; 75 76 spin_lock_irqsave(&newchannel->sc_lock, flags); 77 if (newchannel->state == CHANNEL_OPEN_STATE) { 78 newchannel->state = CHANNEL_OPENING_STATE; 79 } else { 80 spin_unlock_irqrestore(&newchannel->sc_lock, flags); 81 return -EINVAL; 82 } 83 spin_unlock_irqrestore(&newchannel->sc_lock, flags); 84 85 newchannel->onchannel_callback = onchannelcallback; 86 newchannel->channel_callback_context = context; 87 88 /* Allocate the ring buffer */ 89 out = (void *)__get_free_pages(GFP_KERNEL|__GFP_ZERO, 90 get_order(send_ringbuffer_size + recv_ringbuffer_size)); 91 92 if (!out) 93 return -ENOMEM; 94 95 96 in = (void *)((unsigned long)out + send_ringbuffer_size); 97 98 newchannel->ringbuffer_pages = out; 99 newchannel->ringbuffer_pagecount = (send_ringbuffer_size + 100 recv_ringbuffer_size) >> PAGE_SHIFT; 101 102 ret = hv_ringbuffer_init( 103 &newchannel->outbound, out, send_ringbuffer_size); 104 105 if (ret != 0) { 106 err = ret; 107 goto error0; 108 } 109 110 ret = hv_ringbuffer_init( 111 &newchannel->inbound, in, recv_ringbuffer_size); 112 if (ret != 0) { 113 err = ret; 114 goto error0; 115 } 116 117 118 /* Establish the gpadl for the ring buffer */ 119 newchannel->ringbuffer_gpadlhandle = 0; 120 121 ret = vmbus_establish_gpadl(newchannel, 122 newchannel->outbound.ring_buffer, 123 send_ringbuffer_size + 124 recv_ringbuffer_size, 125 &newchannel->ringbuffer_gpadlhandle); 126 127 if (ret != 0) { 128 err = ret; 129 goto error0; 130 } 131 132 /* Create and init the channel open message */ 133 open_info = kmalloc(sizeof(*open_info) + 134 sizeof(struct vmbus_channel_open_channel), 135 GFP_KERNEL); 136 if (!open_info) { 137 err = -ENOMEM; 138 goto error0; 139 } 140 141 init_completion(&open_info->waitevent); 142 143 open_msg = (struct vmbus_channel_open_channel *)open_info->msg; 144 open_msg->header.msgtype = CHANNELMSG_OPENCHANNEL; 145 open_msg->openid = newchannel->offermsg.child_relid; 146 open_msg->child_relid = newchannel->offermsg.child_relid; 147 open_msg->ringbuffer_gpadlhandle = newchannel->ringbuffer_gpadlhandle; 148 open_msg->downstream_ringbuffer_pageoffset = send_ringbuffer_size >> 149 PAGE_SHIFT; 150 open_msg->target_vp = newchannel->target_vp; 151 152 if (userdatalen > MAX_USER_DEFINED_BYTES) { 153 err = -EINVAL; 154 goto error0; 155 } 156 157 if (userdatalen) 158 memcpy(open_msg->userdata, userdata, userdatalen); 159 160 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 161 list_add_tail(&open_info->msglistentry, 162 &vmbus_connection.chn_msg_list); 163 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 164 165 ret = vmbus_post_msg(open_msg, 166 sizeof(struct vmbus_channel_open_channel)); 167 168 if (ret != 0) { 169 err = ret; 170 goto error1; 171 } 172 173 t = wait_for_completion_timeout(&open_info->waitevent, 5*HZ); 174 if (t == 0) { 175 err = -ETIMEDOUT; 176 goto error1; 177 } 178 179 180 if (open_info->response.open_result.status) 181 err = open_info->response.open_result.status; 182 183 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 184 list_del(&open_info->msglistentry); 185 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 186 187 if (err == 0) 188 newchannel->state = CHANNEL_OPENED_STATE; 189 190 kfree(open_info); 191 return err; 192 193 error1: 194 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 195 list_del(&open_info->msglistentry); 196 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 197 198 error0: 199 free_pages((unsigned long)out, 200 get_order(send_ringbuffer_size + recv_ringbuffer_size)); 201 kfree(open_info); 202 return err; 203 } 204 EXPORT_SYMBOL_GPL(vmbus_open); 205 206 /* 207 * create_gpadl_header - Creates a gpadl for the specified buffer 208 */ 209 static int create_gpadl_header(void *kbuffer, u32 size, 210 struct vmbus_channel_msginfo **msginfo, 211 u32 *messagecount) 212 { 213 int i; 214 int pagecount; 215 struct vmbus_channel_gpadl_header *gpadl_header; 216 struct vmbus_channel_gpadl_body *gpadl_body; 217 struct vmbus_channel_msginfo *msgheader; 218 struct vmbus_channel_msginfo *msgbody = NULL; 219 u32 msgsize; 220 221 int pfnsum, pfncount, pfnleft, pfncurr, pfnsize; 222 223 pagecount = size >> PAGE_SHIFT; 224 225 /* do we need a gpadl body msg */ 226 pfnsize = MAX_SIZE_CHANNEL_MESSAGE - 227 sizeof(struct vmbus_channel_gpadl_header) - 228 sizeof(struct gpa_range); 229 pfncount = pfnsize / sizeof(u64); 230 231 if (pagecount > pfncount) { 232 /* we need a gpadl body */ 233 /* fill in the header */ 234 msgsize = sizeof(struct vmbus_channel_msginfo) + 235 sizeof(struct vmbus_channel_gpadl_header) + 236 sizeof(struct gpa_range) + pfncount * sizeof(u64); 237 msgheader = kzalloc(msgsize, GFP_KERNEL); 238 if (!msgheader) 239 goto nomem; 240 241 INIT_LIST_HEAD(&msgheader->submsglist); 242 msgheader->msgsize = msgsize; 243 244 gpadl_header = (struct vmbus_channel_gpadl_header *) 245 msgheader->msg; 246 gpadl_header->rangecount = 1; 247 gpadl_header->range_buflen = sizeof(struct gpa_range) + 248 pagecount * sizeof(u64); 249 gpadl_header->range[0].byte_offset = 0; 250 gpadl_header->range[0].byte_count = size; 251 for (i = 0; i < pfncount; i++) 252 gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( 253 kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; 254 *msginfo = msgheader; 255 *messagecount = 1; 256 257 pfnsum = pfncount; 258 pfnleft = pagecount - pfncount; 259 260 /* how many pfns can we fit */ 261 pfnsize = MAX_SIZE_CHANNEL_MESSAGE - 262 sizeof(struct vmbus_channel_gpadl_body); 263 pfncount = pfnsize / sizeof(u64); 264 265 /* fill in the body */ 266 while (pfnleft) { 267 if (pfnleft > pfncount) 268 pfncurr = pfncount; 269 else 270 pfncurr = pfnleft; 271 272 msgsize = sizeof(struct vmbus_channel_msginfo) + 273 sizeof(struct vmbus_channel_gpadl_body) + 274 pfncurr * sizeof(u64); 275 msgbody = kzalloc(msgsize, GFP_KERNEL); 276 277 if (!msgbody) { 278 struct vmbus_channel_msginfo *pos = NULL; 279 struct vmbus_channel_msginfo *tmp = NULL; 280 /* 281 * Free up all the allocated messages. 282 */ 283 list_for_each_entry_safe(pos, tmp, 284 &msgheader->submsglist, 285 msglistentry) { 286 287 list_del(&pos->msglistentry); 288 kfree(pos); 289 } 290 291 goto nomem; 292 } 293 294 msgbody->msgsize = msgsize; 295 (*messagecount)++; 296 gpadl_body = 297 (struct vmbus_channel_gpadl_body *)msgbody->msg; 298 299 /* 300 * Gpadl is u32 and we are using a pointer which could 301 * be 64-bit 302 * This is governed by the guest/host protocol and 303 * so the hypervisor gurantees that this is ok. 304 */ 305 for (i = 0; i < pfncurr; i++) 306 gpadl_body->pfn[i] = slow_virt_to_phys( 307 kbuffer + PAGE_SIZE * (pfnsum + i)) >> 308 PAGE_SHIFT; 309 310 /* add to msg header */ 311 list_add_tail(&msgbody->msglistentry, 312 &msgheader->submsglist); 313 pfnsum += pfncurr; 314 pfnleft -= pfncurr; 315 } 316 } else { 317 /* everything fits in a header */ 318 msgsize = sizeof(struct vmbus_channel_msginfo) + 319 sizeof(struct vmbus_channel_gpadl_header) + 320 sizeof(struct gpa_range) + pagecount * sizeof(u64); 321 msgheader = kzalloc(msgsize, GFP_KERNEL); 322 if (msgheader == NULL) 323 goto nomem; 324 msgheader->msgsize = msgsize; 325 326 gpadl_header = (struct vmbus_channel_gpadl_header *) 327 msgheader->msg; 328 gpadl_header->rangecount = 1; 329 gpadl_header->range_buflen = sizeof(struct gpa_range) + 330 pagecount * sizeof(u64); 331 gpadl_header->range[0].byte_offset = 0; 332 gpadl_header->range[0].byte_count = size; 333 for (i = 0; i < pagecount; i++) 334 gpadl_header->range[0].pfn_array[i] = slow_virt_to_phys( 335 kbuffer + PAGE_SIZE * i) >> PAGE_SHIFT; 336 337 *msginfo = msgheader; 338 *messagecount = 1; 339 } 340 341 return 0; 342 nomem: 343 kfree(msgheader); 344 kfree(msgbody); 345 return -ENOMEM; 346 } 347 348 /* 349 * vmbus_establish_gpadl - Estabish a GPADL for the specified buffer 350 * 351 * @channel: a channel 352 * @kbuffer: from kmalloc or vmalloc 353 * @size: page-size multiple 354 * @gpadl_handle: some funky thing 355 */ 356 int vmbus_establish_gpadl(struct vmbus_channel *channel, void *kbuffer, 357 u32 size, u32 *gpadl_handle) 358 { 359 struct vmbus_channel_gpadl_header *gpadlmsg; 360 struct vmbus_channel_gpadl_body *gpadl_body; 361 struct vmbus_channel_msginfo *msginfo = NULL; 362 struct vmbus_channel_msginfo *submsginfo; 363 u32 msgcount; 364 struct list_head *curr; 365 u32 next_gpadl_handle; 366 unsigned long flags; 367 int ret = 0; 368 369 next_gpadl_handle = atomic_read(&vmbus_connection.next_gpadl_handle); 370 atomic_inc(&vmbus_connection.next_gpadl_handle); 371 372 ret = create_gpadl_header(kbuffer, size, &msginfo, &msgcount); 373 if (ret) 374 return ret; 375 376 init_completion(&msginfo->waitevent); 377 378 gpadlmsg = (struct vmbus_channel_gpadl_header *)msginfo->msg; 379 gpadlmsg->header.msgtype = CHANNELMSG_GPADL_HEADER; 380 gpadlmsg->child_relid = channel->offermsg.child_relid; 381 gpadlmsg->gpadl = next_gpadl_handle; 382 383 384 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 385 list_add_tail(&msginfo->msglistentry, 386 &vmbus_connection.chn_msg_list); 387 388 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 389 390 ret = vmbus_post_msg(gpadlmsg, msginfo->msgsize - 391 sizeof(*msginfo)); 392 if (ret != 0) 393 goto cleanup; 394 395 if (msgcount > 1) { 396 list_for_each(curr, &msginfo->submsglist) { 397 398 submsginfo = (struct vmbus_channel_msginfo *)curr; 399 gpadl_body = 400 (struct vmbus_channel_gpadl_body *)submsginfo->msg; 401 402 gpadl_body->header.msgtype = 403 CHANNELMSG_GPADL_BODY; 404 gpadl_body->gpadl = next_gpadl_handle; 405 406 ret = vmbus_post_msg(gpadl_body, 407 submsginfo->msgsize - 408 sizeof(*submsginfo)); 409 if (ret != 0) 410 goto cleanup; 411 412 } 413 } 414 wait_for_completion(&msginfo->waitevent); 415 416 /* At this point, we received the gpadl created msg */ 417 *gpadl_handle = gpadlmsg->gpadl; 418 419 cleanup: 420 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 421 list_del(&msginfo->msglistentry); 422 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 423 424 kfree(msginfo); 425 return ret; 426 } 427 EXPORT_SYMBOL_GPL(vmbus_establish_gpadl); 428 429 /* 430 * vmbus_teardown_gpadl -Teardown the specified GPADL handle 431 */ 432 int vmbus_teardown_gpadl(struct vmbus_channel *channel, u32 gpadl_handle) 433 { 434 struct vmbus_channel_gpadl_teardown *msg; 435 struct vmbus_channel_msginfo *info; 436 unsigned long flags; 437 int ret; 438 439 info = kmalloc(sizeof(*info) + 440 sizeof(struct vmbus_channel_gpadl_teardown), GFP_KERNEL); 441 if (!info) 442 return -ENOMEM; 443 444 init_completion(&info->waitevent); 445 446 msg = (struct vmbus_channel_gpadl_teardown *)info->msg; 447 448 msg->header.msgtype = CHANNELMSG_GPADL_TEARDOWN; 449 msg->child_relid = channel->offermsg.child_relid; 450 msg->gpadl = gpadl_handle; 451 452 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 453 list_add_tail(&info->msglistentry, 454 &vmbus_connection.chn_msg_list); 455 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 456 ret = vmbus_post_msg(msg, 457 sizeof(struct vmbus_channel_gpadl_teardown)); 458 459 if (ret) 460 goto post_msg_err; 461 462 wait_for_completion(&info->waitevent); 463 464 post_msg_err: 465 spin_lock_irqsave(&vmbus_connection.channelmsg_lock, flags); 466 list_del(&info->msglistentry); 467 spin_unlock_irqrestore(&vmbus_connection.channelmsg_lock, flags); 468 469 kfree(info); 470 return ret; 471 } 472 EXPORT_SYMBOL_GPL(vmbus_teardown_gpadl); 473 474 static void reset_channel_cb(void *arg) 475 { 476 struct vmbus_channel *channel = arg; 477 478 channel->onchannel_callback = NULL; 479 } 480 481 static int vmbus_close_internal(struct vmbus_channel *channel) 482 { 483 struct vmbus_channel_close_channel *msg; 484 int ret; 485 486 channel->state = CHANNEL_OPEN_STATE; 487 channel->sc_creation_callback = NULL; 488 /* Stop callback and cancel the timer asap */ 489 if (channel->target_cpu != get_cpu()) { 490 put_cpu(); 491 smp_call_function_single(channel->target_cpu, reset_channel_cb, 492 channel, true); 493 } else { 494 reset_channel_cb(channel); 495 put_cpu(); 496 } 497 498 /* Send a closing message */ 499 500 msg = &channel->close_msg.msg; 501 502 msg->header.msgtype = CHANNELMSG_CLOSECHANNEL; 503 msg->child_relid = channel->offermsg.child_relid; 504 505 ret = vmbus_post_msg(msg, sizeof(struct vmbus_channel_close_channel)); 506 507 if (ret) { 508 pr_err("Close failed: close post msg return is %d\n", ret); 509 /* 510 * If we failed to post the close msg, 511 * it is perhaps better to leak memory. 512 */ 513 return ret; 514 } 515 516 /* Tear down the gpadl for the channel's ring buffer */ 517 if (channel->ringbuffer_gpadlhandle) { 518 ret = vmbus_teardown_gpadl(channel, 519 channel->ringbuffer_gpadlhandle); 520 if (ret) { 521 pr_err("Close failed: teardown gpadl return %d\n", ret); 522 /* 523 * If we failed to teardown gpadl, 524 * it is perhaps better to leak memory. 525 */ 526 return ret; 527 } 528 } 529 530 /* Cleanup the ring buffers for this channel */ 531 hv_ringbuffer_cleanup(&channel->outbound); 532 hv_ringbuffer_cleanup(&channel->inbound); 533 534 free_pages((unsigned long)channel->ringbuffer_pages, 535 get_order(channel->ringbuffer_pagecount * PAGE_SIZE)); 536 537 return ret; 538 } 539 540 /* 541 * vmbus_close - Close the specified channel 542 */ 543 void vmbus_close(struct vmbus_channel *channel) 544 { 545 struct list_head *cur, *tmp; 546 struct vmbus_channel *cur_channel; 547 548 if (channel->primary_channel != NULL) { 549 /* 550 * We will only close sub-channels when 551 * the primary is closed. 552 */ 553 return; 554 } 555 /* 556 * Close all the sub-channels first and then close the 557 * primary channel. 558 */ 559 list_for_each_safe(cur, tmp, &channel->sc_list) { 560 cur_channel = list_entry(cur, struct vmbus_channel, sc_list); 561 if (cur_channel->state != CHANNEL_OPENED_STATE) 562 continue; 563 vmbus_close_internal(cur_channel); 564 } 565 /* 566 * Now close the primary. 567 */ 568 vmbus_close_internal(channel); 569 } 570 EXPORT_SYMBOL_GPL(vmbus_close); 571 572 /** 573 * vmbus_sendpacket() - Send the specified buffer on the given channel 574 * @channel: Pointer to vmbus_channel structure. 575 * @buffer: Pointer to the buffer you want to receive the data into. 576 * @bufferlen: Maximum size of what the the buffer will hold 577 * @requestid: Identifier of the request 578 * @type: Type of packet that is being send e.g. negotiate, time 579 * packet etc. 580 * 581 * Sends data in @buffer directly to hyper-v via the vmbus 582 * This will send the data unparsed to hyper-v. 583 * 584 * Mainly used by Hyper-V drivers. 585 */ 586 int vmbus_sendpacket(struct vmbus_channel *channel, void *buffer, 587 u32 bufferlen, u64 requestid, 588 enum vmbus_packet_type type, u32 flags) 589 { 590 struct vmpacket_descriptor desc; 591 u32 packetlen = sizeof(struct vmpacket_descriptor) + bufferlen; 592 u32 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); 593 struct kvec bufferlist[3]; 594 u64 aligned_data = 0; 595 int ret; 596 bool signal = false; 597 598 599 /* Setup the descriptor */ 600 desc.type = type; /* VmbusPacketTypeDataInBand; */ 601 desc.flags = flags; /* VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; */ 602 /* in 8-bytes granularity */ 603 desc.offset8 = sizeof(struct vmpacket_descriptor) >> 3; 604 desc.len8 = (u16)(packetlen_aligned >> 3); 605 desc.trans_id = requestid; 606 607 bufferlist[0].iov_base = &desc; 608 bufferlist[0].iov_len = sizeof(struct vmpacket_descriptor); 609 bufferlist[1].iov_base = buffer; 610 bufferlist[1].iov_len = bufferlen; 611 bufferlist[2].iov_base = &aligned_data; 612 bufferlist[2].iov_len = (packetlen_aligned - packetlen); 613 614 ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); 615 616 if (ret == 0 && signal) 617 vmbus_setevent(channel); 618 619 return ret; 620 } 621 EXPORT_SYMBOL(vmbus_sendpacket); 622 623 /* 624 * vmbus_sendpacket_pagebuffer - Send a range of single-page buffer 625 * packets using a GPADL Direct packet type. 626 */ 627 int vmbus_sendpacket_pagebuffer(struct vmbus_channel *channel, 628 struct hv_page_buffer pagebuffers[], 629 u32 pagecount, void *buffer, u32 bufferlen, 630 u64 requestid) 631 { 632 int ret; 633 int i; 634 struct vmbus_channel_packet_page_buffer desc; 635 u32 descsize; 636 u32 packetlen; 637 u32 packetlen_aligned; 638 struct kvec bufferlist[3]; 639 u64 aligned_data = 0; 640 bool signal = false; 641 642 if (pagecount > MAX_PAGE_BUFFER_COUNT) 643 return -EINVAL; 644 645 646 /* 647 * Adjust the size down since vmbus_channel_packet_page_buffer is the 648 * largest size we support 649 */ 650 descsize = sizeof(struct vmbus_channel_packet_page_buffer) - 651 ((MAX_PAGE_BUFFER_COUNT - pagecount) * 652 sizeof(struct hv_page_buffer)); 653 packetlen = descsize + bufferlen; 654 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); 655 656 /* Setup the descriptor */ 657 desc.type = VM_PKT_DATA_USING_GPA_DIRECT; 658 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 659 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ 660 desc.length8 = (u16)(packetlen_aligned >> 3); 661 desc.transactionid = requestid; 662 desc.rangecount = pagecount; 663 664 for (i = 0; i < pagecount; i++) { 665 desc.range[i].len = pagebuffers[i].len; 666 desc.range[i].offset = pagebuffers[i].offset; 667 desc.range[i].pfn = pagebuffers[i].pfn; 668 } 669 670 bufferlist[0].iov_base = &desc; 671 bufferlist[0].iov_len = descsize; 672 bufferlist[1].iov_base = buffer; 673 bufferlist[1].iov_len = bufferlen; 674 bufferlist[2].iov_base = &aligned_data; 675 bufferlist[2].iov_len = (packetlen_aligned - packetlen); 676 677 ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); 678 679 if (ret == 0 && signal) 680 vmbus_setevent(channel); 681 682 return ret; 683 } 684 EXPORT_SYMBOL_GPL(vmbus_sendpacket_pagebuffer); 685 686 /* 687 * vmbus_sendpacket_multipagebuffer - Send a multi-page buffer packet 688 * using a GPADL Direct packet type. 689 */ 690 int vmbus_sendpacket_multipagebuffer(struct vmbus_channel *channel, 691 struct hv_multipage_buffer *multi_pagebuffer, 692 void *buffer, u32 bufferlen, u64 requestid) 693 { 694 int ret; 695 struct vmbus_channel_packet_multipage_buffer desc; 696 u32 descsize; 697 u32 packetlen; 698 u32 packetlen_aligned; 699 struct kvec bufferlist[3]; 700 u64 aligned_data = 0; 701 bool signal = false; 702 u32 pfncount = NUM_PAGES_SPANNED(multi_pagebuffer->offset, 703 multi_pagebuffer->len); 704 705 if (pfncount > MAX_MULTIPAGE_BUFFER_COUNT) 706 return -EINVAL; 707 708 /* 709 * Adjust the size down since vmbus_channel_packet_multipage_buffer is 710 * the largest size we support 711 */ 712 descsize = sizeof(struct vmbus_channel_packet_multipage_buffer) - 713 ((MAX_MULTIPAGE_BUFFER_COUNT - pfncount) * 714 sizeof(u64)); 715 packetlen = descsize + bufferlen; 716 packetlen_aligned = ALIGN(packetlen, sizeof(u64)); 717 718 719 /* Setup the descriptor */ 720 desc.type = VM_PKT_DATA_USING_GPA_DIRECT; 721 desc.flags = VMBUS_DATA_PACKET_FLAG_COMPLETION_REQUESTED; 722 desc.dataoffset8 = descsize >> 3; /* in 8-bytes grandularity */ 723 desc.length8 = (u16)(packetlen_aligned >> 3); 724 desc.transactionid = requestid; 725 desc.rangecount = 1; 726 727 desc.range.len = multi_pagebuffer->len; 728 desc.range.offset = multi_pagebuffer->offset; 729 730 memcpy(desc.range.pfn_array, multi_pagebuffer->pfn_array, 731 pfncount * sizeof(u64)); 732 733 bufferlist[0].iov_base = &desc; 734 bufferlist[0].iov_len = descsize; 735 bufferlist[1].iov_base = buffer; 736 bufferlist[1].iov_len = bufferlen; 737 bufferlist[2].iov_base = &aligned_data; 738 bufferlist[2].iov_len = (packetlen_aligned - packetlen); 739 740 ret = hv_ringbuffer_write(&channel->outbound, bufferlist, 3, &signal); 741 742 if (ret == 0 && signal) 743 vmbus_setevent(channel); 744 745 return ret; 746 } 747 EXPORT_SYMBOL_GPL(vmbus_sendpacket_multipagebuffer); 748 749 /** 750 * vmbus_recvpacket() - Retrieve the user packet on the specified channel 751 * @channel: Pointer to vmbus_channel structure. 752 * @buffer: Pointer to the buffer you want to receive the data into. 753 * @bufferlen: Maximum size of what the the buffer will hold 754 * @buffer_actual_len: The actual size of the data after it was received 755 * @requestid: Identifier of the request 756 * 757 * Receives directly from the hyper-v vmbus and puts the data it received 758 * into Buffer. This will receive the data unparsed from hyper-v. 759 * 760 * Mainly used by Hyper-V drivers. 761 */ 762 int vmbus_recvpacket(struct vmbus_channel *channel, void *buffer, 763 u32 bufferlen, u32 *buffer_actual_len, u64 *requestid) 764 { 765 struct vmpacket_descriptor desc; 766 u32 packetlen; 767 u32 userlen; 768 int ret; 769 bool signal = false; 770 771 *buffer_actual_len = 0; 772 *requestid = 0; 773 774 775 ret = hv_ringbuffer_peek(&channel->inbound, &desc, 776 sizeof(struct vmpacket_descriptor)); 777 if (ret != 0) 778 return 0; 779 780 packetlen = desc.len8 << 3; 781 userlen = packetlen - (desc.offset8 << 3); 782 783 *buffer_actual_len = userlen; 784 785 if (userlen > bufferlen) { 786 787 pr_err("Buffer too small - got %d needs %d\n", 788 bufferlen, userlen); 789 return -ETOOSMALL; 790 } 791 792 *requestid = desc.trans_id; 793 794 /* Copy over the packet to the user buffer */ 795 ret = hv_ringbuffer_read(&channel->inbound, buffer, userlen, 796 (desc.offset8 << 3), &signal); 797 798 if (signal) 799 vmbus_setevent(channel); 800 801 return 0; 802 } 803 EXPORT_SYMBOL(vmbus_recvpacket); 804 805 /* 806 * vmbus_recvpacket_raw - Retrieve the raw packet on the specified channel 807 */ 808 int vmbus_recvpacket_raw(struct vmbus_channel *channel, void *buffer, 809 u32 bufferlen, u32 *buffer_actual_len, 810 u64 *requestid) 811 { 812 struct vmpacket_descriptor desc; 813 u32 packetlen; 814 int ret; 815 bool signal = false; 816 817 *buffer_actual_len = 0; 818 *requestid = 0; 819 820 821 ret = hv_ringbuffer_peek(&channel->inbound, &desc, 822 sizeof(struct vmpacket_descriptor)); 823 if (ret != 0) 824 return 0; 825 826 827 packetlen = desc.len8 << 3; 828 829 *buffer_actual_len = packetlen; 830 831 if (packetlen > bufferlen) 832 return -ENOBUFS; 833 834 *requestid = desc.trans_id; 835 836 /* Copy over the entire packet to the user buffer */ 837 ret = hv_ringbuffer_read(&channel->inbound, buffer, packetlen, 0, 838 &signal); 839 840 if (signal) 841 vmbus_setevent(channel); 842 843 return ret; 844 } 845 EXPORT_SYMBOL_GPL(vmbus_recvpacket_raw); 846