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 * K. Y. Srinivasan <kys@microsoft.com> 21 * 22 */ 23 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt 24 25 #include <linux/init.h> 26 #include <linux/module.h> 27 #include <linux/device.h> 28 #include <linux/interrupt.h> 29 #include <linux/sysctl.h> 30 #include <linux/slab.h> 31 #include <linux/acpi.h> 32 #include <linux/completion.h> 33 #include <linux/hyperv.h> 34 #include <linux/kernel_stat.h> 35 #include <asm/hyperv.h> 36 #include <asm/hypervisor.h> 37 #include <asm/mshyperv.h> 38 #include "hyperv_vmbus.h" 39 40 static struct acpi_device *hv_acpi_dev; 41 42 static struct tasklet_struct msg_dpc; 43 static struct completion probe_event; 44 static int irq; 45 46 struct resource hyperv_mmio = { 47 .name = "hyperv mmio", 48 .flags = IORESOURCE_MEM, 49 }; 50 EXPORT_SYMBOL_GPL(hyperv_mmio); 51 52 static int vmbus_exists(void) 53 { 54 if (hv_acpi_dev == NULL) 55 return -ENODEV; 56 57 return 0; 58 } 59 60 #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) 61 static void print_alias_name(struct hv_device *hv_dev, char *alias_name) 62 { 63 int i; 64 for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) 65 sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); 66 } 67 68 static u8 channel_monitor_group(struct vmbus_channel *channel) 69 { 70 return (u8)channel->offermsg.monitorid / 32; 71 } 72 73 static u8 channel_monitor_offset(struct vmbus_channel *channel) 74 { 75 return (u8)channel->offermsg.monitorid % 32; 76 } 77 78 static u32 channel_pending(struct vmbus_channel *channel, 79 struct hv_monitor_page *monitor_page) 80 { 81 u8 monitor_group = channel_monitor_group(channel); 82 return monitor_page->trigger_group[monitor_group].pending; 83 } 84 85 static u32 channel_latency(struct vmbus_channel *channel, 86 struct hv_monitor_page *monitor_page) 87 { 88 u8 monitor_group = channel_monitor_group(channel); 89 u8 monitor_offset = channel_monitor_offset(channel); 90 return monitor_page->latency[monitor_group][monitor_offset]; 91 } 92 93 static u32 channel_conn_id(struct vmbus_channel *channel, 94 struct hv_monitor_page *monitor_page) 95 { 96 u8 monitor_group = channel_monitor_group(channel); 97 u8 monitor_offset = channel_monitor_offset(channel); 98 return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; 99 } 100 101 static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, 102 char *buf) 103 { 104 struct hv_device *hv_dev = device_to_hv_device(dev); 105 106 if (!hv_dev->channel) 107 return -ENODEV; 108 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); 109 } 110 static DEVICE_ATTR_RO(id); 111 112 static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, 113 char *buf) 114 { 115 struct hv_device *hv_dev = device_to_hv_device(dev); 116 117 if (!hv_dev->channel) 118 return -ENODEV; 119 return sprintf(buf, "%d\n", hv_dev->channel->state); 120 } 121 static DEVICE_ATTR_RO(state); 122 123 static ssize_t monitor_id_show(struct device *dev, 124 struct device_attribute *dev_attr, char *buf) 125 { 126 struct hv_device *hv_dev = device_to_hv_device(dev); 127 128 if (!hv_dev->channel) 129 return -ENODEV; 130 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); 131 } 132 static DEVICE_ATTR_RO(monitor_id); 133 134 static ssize_t class_id_show(struct device *dev, 135 struct device_attribute *dev_attr, char *buf) 136 { 137 struct hv_device *hv_dev = device_to_hv_device(dev); 138 139 if (!hv_dev->channel) 140 return -ENODEV; 141 return sprintf(buf, "{%pUl}\n", 142 hv_dev->channel->offermsg.offer.if_type.b); 143 } 144 static DEVICE_ATTR_RO(class_id); 145 146 static ssize_t device_id_show(struct device *dev, 147 struct device_attribute *dev_attr, char *buf) 148 { 149 struct hv_device *hv_dev = device_to_hv_device(dev); 150 151 if (!hv_dev->channel) 152 return -ENODEV; 153 return sprintf(buf, "{%pUl}\n", 154 hv_dev->channel->offermsg.offer.if_instance.b); 155 } 156 static DEVICE_ATTR_RO(device_id); 157 158 static ssize_t modalias_show(struct device *dev, 159 struct device_attribute *dev_attr, char *buf) 160 { 161 struct hv_device *hv_dev = device_to_hv_device(dev); 162 char alias_name[VMBUS_ALIAS_LEN + 1]; 163 164 print_alias_name(hv_dev, alias_name); 165 return sprintf(buf, "vmbus:%s\n", alias_name); 166 } 167 static DEVICE_ATTR_RO(modalias); 168 169 static ssize_t server_monitor_pending_show(struct device *dev, 170 struct device_attribute *dev_attr, 171 char *buf) 172 { 173 struct hv_device *hv_dev = device_to_hv_device(dev); 174 175 if (!hv_dev->channel) 176 return -ENODEV; 177 return sprintf(buf, "%d\n", 178 channel_pending(hv_dev->channel, 179 vmbus_connection.monitor_pages[1])); 180 } 181 static DEVICE_ATTR_RO(server_monitor_pending); 182 183 static ssize_t client_monitor_pending_show(struct device *dev, 184 struct device_attribute *dev_attr, 185 char *buf) 186 { 187 struct hv_device *hv_dev = device_to_hv_device(dev); 188 189 if (!hv_dev->channel) 190 return -ENODEV; 191 return sprintf(buf, "%d\n", 192 channel_pending(hv_dev->channel, 193 vmbus_connection.monitor_pages[1])); 194 } 195 static DEVICE_ATTR_RO(client_monitor_pending); 196 197 static ssize_t server_monitor_latency_show(struct device *dev, 198 struct device_attribute *dev_attr, 199 char *buf) 200 { 201 struct hv_device *hv_dev = device_to_hv_device(dev); 202 203 if (!hv_dev->channel) 204 return -ENODEV; 205 return sprintf(buf, "%d\n", 206 channel_latency(hv_dev->channel, 207 vmbus_connection.monitor_pages[0])); 208 } 209 static DEVICE_ATTR_RO(server_monitor_latency); 210 211 static ssize_t client_monitor_latency_show(struct device *dev, 212 struct device_attribute *dev_attr, 213 char *buf) 214 { 215 struct hv_device *hv_dev = device_to_hv_device(dev); 216 217 if (!hv_dev->channel) 218 return -ENODEV; 219 return sprintf(buf, "%d\n", 220 channel_latency(hv_dev->channel, 221 vmbus_connection.monitor_pages[1])); 222 } 223 static DEVICE_ATTR_RO(client_monitor_latency); 224 225 static ssize_t server_monitor_conn_id_show(struct device *dev, 226 struct device_attribute *dev_attr, 227 char *buf) 228 { 229 struct hv_device *hv_dev = device_to_hv_device(dev); 230 231 if (!hv_dev->channel) 232 return -ENODEV; 233 return sprintf(buf, "%d\n", 234 channel_conn_id(hv_dev->channel, 235 vmbus_connection.monitor_pages[0])); 236 } 237 static DEVICE_ATTR_RO(server_monitor_conn_id); 238 239 static ssize_t client_monitor_conn_id_show(struct device *dev, 240 struct device_attribute *dev_attr, 241 char *buf) 242 { 243 struct hv_device *hv_dev = device_to_hv_device(dev); 244 245 if (!hv_dev->channel) 246 return -ENODEV; 247 return sprintf(buf, "%d\n", 248 channel_conn_id(hv_dev->channel, 249 vmbus_connection.monitor_pages[1])); 250 } 251 static DEVICE_ATTR_RO(client_monitor_conn_id); 252 253 static ssize_t out_intr_mask_show(struct device *dev, 254 struct device_attribute *dev_attr, char *buf) 255 { 256 struct hv_device *hv_dev = device_to_hv_device(dev); 257 struct hv_ring_buffer_debug_info outbound; 258 259 if (!hv_dev->channel) 260 return -ENODEV; 261 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 262 return sprintf(buf, "%d\n", outbound.current_interrupt_mask); 263 } 264 static DEVICE_ATTR_RO(out_intr_mask); 265 266 static ssize_t out_read_index_show(struct device *dev, 267 struct device_attribute *dev_attr, char *buf) 268 { 269 struct hv_device *hv_dev = device_to_hv_device(dev); 270 struct hv_ring_buffer_debug_info outbound; 271 272 if (!hv_dev->channel) 273 return -ENODEV; 274 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 275 return sprintf(buf, "%d\n", outbound.current_read_index); 276 } 277 static DEVICE_ATTR_RO(out_read_index); 278 279 static ssize_t out_write_index_show(struct device *dev, 280 struct device_attribute *dev_attr, 281 char *buf) 282 { 283 struct hv_device *hv_dev = device_to_hv_device(dev); 284 struct hv_ring_buffer_debug_info outbound; 285 286 if (!hv_dev->channel) 287 return -ENODEV; 288 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 289 return sprintf(buf, "%d\n", outbound.current_write_index); 290 } 291 static DEVICE_ATTR_RO(out_write_index); 292 293 static ssize_t out_read_bytes_avail_show(struct device *dev, 294 struct device_attribute *dev_attr, 295 char *buf) 296 { 297 struct hv_device *hv_dev = device_to_hv_device(dev); 298 struct hv_ring_buffer_debug_info outbound; 299 300 if (!hv_dev->channel) 301 return -ENODEV; 302 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 303 return sprintf(buf, "%d\n", outbound.bytes_avail_toread); 304 } 305 static DEVICE_ATTR_RO(out_read_bytes_avail); 306 307 static ssize_t out_write_bytes_avail_show(struct device *dev, 308 struct device_attribute *dev_attr, 309 char *buf) 310 { 311 struct hv_device *hv_dev = device_to_hv_device(dev); 312 struct hv_ring_buffer_debug_info outbound; 313 314 if (!hv_dev->channel) 315 return -ENODEV; 316 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 317 return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); 318 } 319 static DEVICE_ATTR_RO(out_write_bytes_avail); 320 321 static ssize_t in_intr_mask_show(struct device *dev, 322 struct device_attribute *dev_attr, char *buf) 323 { 324 struct hv_device *hv_dev = device_to_hv_device(dev); 325 struct hv_ring_buffer_debug_info inbound; 326 327 if (!hv_dev->channel) 328 return -ENODEV; 329 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 330 return sprintf(buf, "%d\n", inbound.current_interrupt_mask); 331 } 332 static DEVICE_ATTR_RO(in_intr_mask); 333 334 static ssize_t in_read_index_show(struct device *dev, 335 struct device_attribute *dev_attr, char *buf) 336 { 337 struct hv_device *hv_dev = device_to_hv_device(dev); 338 struct hv_ring_buffer_debug_info inbound; 339 340 if (!hv_dev->channel) 341 return -ENODEV; 342 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 343 return sprintf(buf, "%d\n", inbound.current_read_index); 344 } 345 static DEVICE_ATTR_RO(in_read_index); 346 347 static ssize_t in_write_index_show(struct device *dev, 348 struct device_attribute *dev_attr, char *buf) 349 { 350 struct hv_device *hv_dev = device_to_hv_device(dev); 351 struct hv_ring_buffer_debug_info inbound; 352 353 if (!hv_dev->channel) 354 return -ENODEV; 355 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 356 return sprintf(buf, "%d\n", inbound.current_write_index); 357 } 358 static DEVICE_ATTR_RO(in_write_index); 359 360 static ssize_t in_read_bytes_avail_show(struct device *dev, 361 struct device_attribute *dev_attr, 362 char *buf) 363 { 364 struct hv_device *hv_dev = device_to_hv_device(dev); 365 struct hv_ring_buffer_debug_info inbound; 366 367 if (!hv_dev->channel) 368 return -ENODEV; 369 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 370 return sprintf(buf, "%d\n", inbound.bytes_avail_toread); 371 } 372 static DEVICE_ATTR_RO(in_read_bytes_avail); 373 374 static ssize_t in_write_bytes_avail_show(struct device *dev, 375 struct device_attribute *dev_attr, 376 char *buf) 377 { 378 struct hv_device *hv_dev = device_to_hv_device(dev); 379 struct hv_ring_buffer_debug_info inbound; 380 381 if (!hv_dev->channel) 382 return -ENODEV; 383 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 384 return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); 385 } 386 static DEVICE_ATTR_RO(in_write_bytes_avail); 387 388 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ 389 static struct attribute *vmbus_attrs[] = { 390 &dev_attr_id.attr, 391 &dev_attr_state.attr, 392 &dev_attr_monitor_id.attr, 393 &dev_attr_class_id.attr, 394 &dev_attr_device_id.attr, 395 &dev_attr_modalias.attr, 396 &dev_attr_server_monitor_pending.attr, 397 &dev_attr_client_monitor_pending.attr, 398 &dev_attr_server_monitor_latency.attr, 399 &dev_attr_client_monitor_latency.attr, 400 &dev_attr_server_monitor_conn_id.attr, 401 &dev_attr_client_monitor_conn_id.attr, 402 &dev_attr_out_intr_mask.attr, 403 &dev_attr_out_read_index.attr, 404 &dev_attr_out_write_index.attr, 405 &dev_attr_out_read_bytes_avail.attr, 406 &dev_attr_out_write_bytes_avail.attr, 407 &dev_attr_in_intr_mask.attr, 408 &dev_attr_in_read_index.attr, 409 &dev_attr_in_write_index.attr, 410 &dev_attr_in_read_bytes_avail.attr, 411 &dev_attr_in_write_bytes_avail.attr, 412 NULL, 413 }; 414 ATTRIBUTE_GROUPS(vmbus); 415 416 /* 417 * vmbus_uevent - add uevent for our device 418 * 419 * This routine is invoked when a device is added or removed on the vmbus to 420 * generate a uevent to udev in the userspace. The udev will then look at its 421 * rule and the uevent generated here to load the appropriate driver 422 * 423 * The alias string will be of the form vmbus:guid where guid is the string 424 * representation of the device guid (each byte of the guid will be 425 * represented with two hex characters. 426 */ 427 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) 428 { 429 struct hv_device *dev = device_to_hv_device(device); 430 int ret; 431 char alias_name[VMBUS_ALIAS_LEN + 1]; 432 433 print_alias_name(dev, alias_name); 434 ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); 435 return ret; 436 } 437 438 static uuid_le null_guid; 439 440 static inline bool is_null_guid(const __u8 *guid) 441 { 442 if (memcmp(guid, &null_guid, sizeof(uuid_le))) 443 return false; 444 return true; 445 } 446 447 /* 448 * Return a matching hv_vmbus_device_id pointer. 449 * If there is no match, return NULL. 450 */ 451 static const struct hv_vmbus_device_id *hv_vmbus_get_id( 452 const struct hv_vmbus_device_id *id, 453 __u8 *guid) 454 { 455 for (; !is_null_guid(id->guid); id++) 456 if (!memcmp(&id->guid, guid, sizeof(uuid_le))) 457 return id; 458 459 return NULL; 460 } 461 462 463 464 /* 465 * vmbus_match - Attempt to match the specified device to the specified driver 466 */ 467 static int vmbus_match(struct device *device, struct device_driver *driver) 468 { 469 struct hv_driver *drv = drv_to_hv_drv(driver); 470 struct hv_device *hv_dev = device_to_hv_device(device); 471 472 if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) 473 return 1; 474 475 return 0; 476 } 477 478 /* 479 * vmbus_probe - Add the new vmbus's child device 480 */ 481 static int vmbus_probe(struct device *child_device) 482 { 483 int ret = 0; 484 struct hv_driver *drv = 485 drv_to_hv_drv(child_device->driver); 486 struct hv_device *dev = device_to_hv_device(child_device); 487 const struct hv_vmbus_device_id *dev_id; 488 489 dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); 490 if (drv->probe) { 491 ret = drv->probe(dev, dev_id); 492 if (ret != 0) 493 pr_err("probe failed for device %s (%d)\n", 494 dev_name(child_device), ret); 495 496 } else { 497 pr_err("probe not set for driver %s\n", 498 dev_name(child_device)); 499 ret = -ENODEV; 500 } 501 return ret; 502 } 503 504 /* 505 * vmbus_remove - Remove a vmbus device 506 */ 507 static int vmbus_remove(struct device *child_device) 508 { 509 struct hv_driver *drv = drv_to_hv_drv(child_device->driver); 510 struct hv_device *dev = device_to_hv_device(child_device); 511 512 if (drv->remove) 513 drv->remove(dev); 514 else 515 pr_err("remove not set for driver %s\n", 516 dev_name(child_device)); 517 518 return 0; 519 } 520 521 522 /* 523 * vmbus_shutdown - Shutdown a vmbus device 524 */ 525 static void vmbus_shutdown(struct device *child_device) 526 { 527 struct hv_driver *drv; 528 struct hv_device *dev = device_to_hv_device(child_device); 529 530 531 /* The device may not be attached yet */ 532 if (!child_device->driver) 533 return; 534 535 drv = drv_to_hv_drv(child_device->driver); 536 537 if (drv->shutdown) 538 drv->shutdown(dev); 539 540 return; 541 } 542 543 544 /* 545 * vmbus_device_release - Final callback release of the vmbus child device 546 */ 547 static void vmbus_device_release(struct device *device) 548 { 549 struct hv_device *hv_dev = device_to_hv_device(device); 550 551 kfree(hv_dev); 552 553 } 554 555 /* The one and only one */ 556 static struct bus_type hv_bus = { 557 .name = "vmbus", 558 .match = vmbus_match, 559 .shutdown = vmbus_shutdown, 560 .remove = vmbus_remove, 561 .probe = vmbus_probe, 562 .uevent = vmbus_uevent, 563 .dev_groups = vmbus_groups, 564 }; 565 566 struct onmessage_work_context { 567 struct work_struct work; 568 struct hv_message msg; 569 }; 570 571 static void vmbus_onmessage_work(struct work_struct *work) 572 { 573 struct onmessage_work_context *ctx; 574 575 ctx = container_of(work, struct onmessage_work_context, 576 work); 577 vmbus_onmessage(&ctx->msg); 578 kfree(ctx); 579 } 580 581 static void vmbus_on_msg_dpc(unsigned long data) 582 { 583 int cpu = smp_processor_id(); 584 void *page_addr = hv_context.synic_message_page[cpu]; 585 struct hv_message *msg = (struct hv_message *)page_addr + 586 VMBUS_MESSAGE_SINT; 587 struct onmessage_work_context *ctx; 588 589 while (1) { 590 if (msg->header.message_type == HVMSG_NONE) { 591 /* no msg */ 592 break; 593 } else { 594 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); 595 if (ctx == NULL) 596 continue; 597 INIT_WORK(&ctx->work, vmbus_onmessage_work); 598 memcpy(&ctx->msg, msg, sizeof(*msg)); 599 queue_work(vmbus_connection.work_queue, &ctx->work); 600 } 601 602 msg->header.message_type = HVMSG_NONE; 603 604 /* 605 * Make sure the write to MessageType (ie set to 606 * HVMSG_NONE) happens before we read the 607 * MessagePending and EOMing. Otherwise, the EOMing 608 * will not deliver any more messages since there is 609 * no empty slot 610 */ 611 mb(); 612 613 if (msg->header.message_flags.msg_pending) { 614 /* 615 * This will cause message queue rescan to 616 * possibly deliver another msg from the 617 * hypervisor 618 */ 619 wrmsrl(HV_X64_MSR_EOM, 0); 620 } 621 } 622 } 623 624 static void vmbus_isr(void) 625 { 626 int cpu = smp_processor_id(); 627 void *page_addr; 628 struct hv_message *msg; 629 union hv_synic_event_flags *event; 630 bool handled = false; 631 632 page_addr = hv_context.synic_event_page[cpu]; 633 if (page_addr == NULL) 634 return; 635 636 event = (union hv_synic_event_flags *)page_addr + 637 VMBUS_MESSAGE_SINT; 638 /* 639 * Check for events before checking for messages. This is the order 640 * in which events and messages are checked in Windows guests on 641 * Hyper-V, and the Windows team suggested we do the same. 642 */ 643 644 if ((vmbus_proto_version == VERSION_WS2008) || 645 (vmbus_proto_version == VERSION_WIN7)) { 646 647 /* Since we are a child, we only need to check bit 0 */ 648 if (sync_test_and_clear_bit(0, 649 (unsigned long *) &event->flags32[0])) { 650 handled = true; 651 } 652 } else { 653 /* 654 * Our host is win8 or above. The signaling mechanism 655 * has changed and we can directly look at the event page. 656 * If bit n is set then we have an interrup on the channel 657 * whose id is n. 658 */ 659 handled = true; 660 } 661 662 if (handled) 663 tasklet_schedule(hv_context.event_dpc[cpu]); 664 665 666 page_addr = hv_context.synic_message_page[cpu]; 667 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; 668 669 /* Check if there are actual msgs to be processed */ 670 if (msg->header.message_type != HVMSG_NONE) 671 tasklet_schedule(&msg_dpc); 672 } 673 674 /* 675 * vmbus_bus_init -Main vmbus driver initialization routine. 676 * 677 * Here, we 678 * - initialize the vmbus driver context 679 * - invoke the vmbus hv main init routine 680 * - get the irq resource 681 * - retrieve the channel offers 682 */ 683 static int vmbus_bus_init(int irq) 684 { 685 int ret; 686 687 /* Hypervisor initialization...setup hypercall page..etc */ 688 ret = hv_init(); 689 if (ret != 0) { 690 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); 691 return ret; 692 } 693 694 tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); 695 696 ret = bus_register(&hv_bus); 697 if (ret) 698 goto err_cleanup; 699 700 hv_setup_vmbus_irq(vmbus_isr); 701 702 ret = hv_synic_alloc(); 703 if (ret) 704 goto err_alloc; 705 /* 706 * Initialize the per-cpu interrupt state and 707 * connect to the host. 708 */ 709 on_each_cpu(hv_synic_init, NULL, 1); 710 ret = vmbus_connect(); 711 if (ret) 712 goto err_alloc; 713 714 vmbus_request_offers(); 715 716 return 0; 717 718 err_alloc: 719 hv_synic_free(); 720 hv_remove_vmbus_irq(); 721 722 bus_unregister(&hv_bus); 723 724 err_cleanup: 725 hv_cleanup(); 726 727 return ret; 728 } 729 730 /** 731 * __vmbus_child_driver_register - Register a vmbus's driver 732 * @drv: Pointer to driver structure you want to register 733 * @owner: owner module of the drv 734 * @mod_name: module name string 735 * 736 * Registers the given driver with Linux through the 'driver_register()' call 737 * and sets up the hyper-v vmbus handling for this driver. 738 * It will return the state of the 'driver_register()' call. 739 * 740 */ 741 int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) 742 { 743 int ret; 744 745 pr_info("registering driver %s\n", hv_driver->name); 746 747 ret = vmbus_exists(); 748 if (ret < 0) 749 return ret; 750 751 hv_driver->driver.name = hv_driver->name; 752 hv_driver->driver.owner = owner; 753 hv_driver->driver.mod_name = mod_name; 754 hv_driver->driver.bus = &hv_bus; 755 756 ret = driver_register(&hv_driver->driver); 757 758 return ret; 759 } 760 EXPORT_SYMBOL_GPL(__vmbus_driver_register); 761 762 /** 763 * vmbus_driver_unregister() - Unregister a vmbus's driver 764 * @drv: Pointer to driver structure you want to un-register 765 * 766 * Un-register the given driver that was previous registered with a call to 767 * vmbus_driver_register() 768 */ 769 void vmbus_driver_unregister(struct hv_driver *hv_driver) 770 { 771 pr_info("unregistering driver %s\n", hv_driver->name); 772 773 if (!vmbus_exists()) 774 driver_unregister(&hv_driver->driver); 775 } 776 EXPORT_SYMBOL_GPL(vmbus_driver_unregister); 777 778 /* 779 * vmbus_device_create - Creates and registers a new child device 780 * on the vmbus. 781 */ 782 struct hv_device *vmbus_device_create(uuid_le *type, 783 uuid_le *instance, 784 struct vmbus_channel *channel) 785 { 786 struct hv_device *child_device_obj; 787 788 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); 789 if (!child_device_obj) { 790 pr_err("Unable to allocate device object for child device\n"); 791 return NULL; 792 } 793 794 child_device_obj->channel = channel; 795 memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); 796 memcpy(&child_device_obj->dev_instance, instance, 797 sizeof(uuid_le)); 798 799 800 return child_device_obj; 801 } 802 803 /* 804 * vmbus_device_register - Register the child device 805 */ 806 int vmbus_device_register(struct hv_device *child_device_obj) 807 { 808 int ret = 0; 809 810 static atomic_t device_num = ATOMIC_INIT(0); 811 812 dev_set_name(&child_device_obj->device, "vmbus_0_%d", 813 atomic_inc_return(&device_num)); 814 815 child_device_obj->device.bus = &hv_bus; 816 child_device_obj->device.parent = &hv_acpi_dev->dev; 817 child_device_obj->device.release = vmbus_device_release; 818 819 /* 820 * Register with the LDM. This will kick off the driver/device 821 * binding...which will eventually call vmbus_match() and vmbus_probe() 822 */ 823 ret = device_register(&child_device_obj->device); 824 825 if (ret) 826 pr_err("Unable to register child device\n"); 827 else 828 pr_debug("child device %s registered\n", 829 dev_name(&child_device_obj->device)); 830 831 return ret; 832 } 833 834 /* 835 * vmbus_device_unregister - Remove the specified child device 836 * from the vmbus. 837 */ 838 void vmbus_device_unregister(struct hv_device *device_obj) 839 { 840 pr_debug("child device %s unregistered\n", 841 dev_name(&device_obj->device)); 842 843 /* 844 * Kick off the process of unregistering the device. 845 * This will call vmbus_remove() and eventually vmbus_device_release() 846 */ 847 device_unregister(&device_obj->device); 848 } 849 850 851 /* 852 * VMBUS is an acpi enumerated device. Get the the information we 853 * need from DSDT. 854 */ 855 856 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) 857 { 858 switch (res->type) { 859 case ACPI_RESOURCE_TYPE_IRQ: 860 irq = res->data.irq.interrupts[0]; 861 break; 862 863 case ACPI_RESOURCE_TYPE_ADDRESS64: 864 hyperv_mmio.start = res->data.address64.minimum; 865 hyperv_mmio.end = res->data.address64.maximum; 866 break; 867 } 868 869 return AE_OK; 870 } 871 872 static int vmbus_acpi_add(struct acpi_device *device) 873 { 874 acpi_status result; 875 int ret_val = -ENODEV; 876 877 hv_acpi_dev = device; 878 879 result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, 880 vmbus_walk_resources, NULL); 881 882 if (ACPI_FAILURE(result)) 883 goto acpi_walk_err; 884 /* 885 * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that 886 * has the mmio ranges. Get that. 887 */ 888 if (device->parent) { 889 result = acpi_walk_resources(device->parent->handle, 890 METHOD_NAME__CRS, 891 vmbus_walk_resources, NULL); 892 893 if (ACPI_FAILURE(result)) 894 goto acpi_walk_err; 895 if (hyperv_mmio.start && hyperv_mmio.end) 896 request_resource(&iomem_resource, &hyperv_mmio); 897 } 898 ret_val = 0; 899 900 acpi_walk_err: 901 complete(&probe_event); 902 return ret_val; 903 } 904 905 static const struct acpi_device_id vmbus_acpi_device_ids[] = { 906 {"VMBUS", 0}, 907 {"VMBus", 0}, 908 {"", 0}, 909 }; 910 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); 911 912 static struct acpi_driver vmbus_acpi_driver = { 913 .name = "vmbus", 914 .ids = vmbus_acpi_device_ids, 915 .ops = { 916 .add = vmbus_acpi_add, 917 }, 918 }; 919 920 static int __init hv_acpi_init(void) 921 { 922 int ret, t; 923 924 if (x86_hyper != &x86_hyper_ms_hyperv) 925 return -ENODEV; 926 927 init_completion(&probe_event); 928 929 /* 930 * Get irq resources first. 931 */ 932 ret = acpi_bus_register_driver(&vmbus_acpi_driver); 933 934 if (ret) 935 return ret; 936 937 t = wait_for_completion_timeout(&probe_event, 5*HZ); 938 if (t == 0) { 939 ret = -ETIMEDOUT; 940 goto cleanup; 941 } 942 943 if (irq <= 0) { 944 ret = -ENODEV; 945 goto cleanup; 946 } 947 948 ret = vmbus_bus_init(irq); 949 if (ret) 950 goto cleanup; 951 952 return 0; 953 954 cleanup: 955 acpi_bus_unregister_driver(&vmbus_acpi_driver); 956 hv_acpi_dev = NULL; 957 return ret; 958 } 959 960 static void __exit vmbus_exit(void) 961 { 962 hv_remove_vmbus_irq(); 963 vmbus_free_channels(); 964 bus_unregister(&hv_bus); 965 hv_cleanup(); 966 acpi_bus_unregister_driver(&vmbus_acpi_driver); 967 } 968 969 970 MODULE_LICENSE("GPL"); 971 972 subsys_initcall(hv_acpi_init); 973 module_exit(vmbus_exit); 974