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 <linux/clockchips.h> 36 #include <asm/hyperv.h> 37 #include <asm/hypervisor.h> 38 #include <asm/mshyperv.h> 39 #include "hyperv_vmbus.h" 40 41 static struct acpi_device *hv_acpi_dev; 42 43 static struct tasklet_struct msg_dpc; 44 static struct completion probe_event; 45 static int irq; 46 47 struct resource hyperv_mmio = { 48 .name = "hyperv mmio", 49 .flags = IORESOURCE_MEM, 50 }; 51 EXPORT_SYMBOL_GPL(hyperv_mmio); 52 53 static int vmbus_exists(void) 54 { 55 if (hv_acpi_dev == NULL) 56 return -ENODEV; 57 58 return 0; 59 } 60 61 #define VMBUS_ALIAS_LEN ((sizeof((struct hv_vmbus_device_id *)0)->guid) * 2) 62 static void print_alias_name(struct hv_device *hv_dev, char *alias_name) 63 { 64 int i; 65 for (i = 0; i < VMBUS_ALIAS_LEN; i += 2) 66 sprintf(&alias_name[i], "%02x", hv_dev->dev_type.b[i/2]); 67 } 68 69 static u8 channel_monitor_group(struct vmbus_channel *channel) 70 { 71 return (u8)channel->offermsg.monitorid / 32; 72 } 73 74 static u8 channel_monitor_offset(struct vmbus_channel *channel) 75 { 76 return (u8)channel->offermsg.monitorid % 32; 77 } 78 79 static u32 channel_pending(struct vmbus_channel *channel, 80 struct hv_monitor_page *monitor_page) 81 { 82 u8 monitor_group = channel_monitor_group(channel); 83 return monitor_page->trigger_group[monitor_group].pending; 84 } 85 86 static u32 channel_latency(struct vmbus_channel *channel, 87 struct hv_monitor_page *monitor_page) 88 { 89 u8 monitor_group = channel_monitor_group(channel); 90 u8 monitor_offset = channel_monitor_offset(channel); 91 return monitor_page->latency[monitor_group][monitor_offset]; 92 } 93 94 static u32 channel_conn_id(struct vmbus_channel *channel, 95 struct hv_monitor_page *monitor_page) 96 { 97 u8 monitor_group = channel_monitor_group(channel); 98 u8 monitor_offset = channel_monitor_offset(channel); 99 return monitor_page->parameter[monitor_group][monitor_offset].connectionid.u.id; 100 } 101 102 static ssize_t id_show(struct device *dev, struct device_attribute *dev_attr, 103 char *buf) 104 { 105 struct hv_device *hv_dev = device_to_hv_device(dev); 106 107 if (!hv_dev->channel) 108 return -ENODEV; 109 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.child_relid); 110 } 111 static DEVICE_ATTR_RO(id); 112 113 static ssize_t state_show(struct device *dev, struct device_attribute *dev_attr, 114 char *buf) 115 { 116 struct hv_device *hv_dev = device_to_hv_device(dev); 117 118 if (!hv_dev->channel) 119 return -ENODEV; 120 return sprintf(buf, "%d\n", hv_dev->channel->state); 121 } 122 static DEVICE_ATTR_RO(state); 123 124 static ssize_t monitor_id_show(struct device *dev, 125 struct device_attribute *dev_attr, char *buf) 126 { 127 struct hv_device *hv_dev = device_to_hv_device(dev); 128 129 if (!hv_dev->channel) 130 return -ENODEV; 131 return sprintf(buf, "%d\n", hv_dev->channel->offermsg.monitorid); 132 } 133 static DEVICE_ATTR_RO(monitor_id); 134 135 static ssize_t class_id_show(struct device *dev, 136 struct device_attribute *dev_attr, char *buf) 137 { 138 struct hv_device *hv_dev = device_to_hv_device(dev); 139 140 if (!hv_dev->channel) 141 return -ENODEV; 142 return sprintf(buf, "{%pUl}\n", 143 hv_dev->channel->offermsg.offer.if_type.b); 144 } 145 static DEVICE_ATTR_RO(class_id); 146 147 static ssize_t device_id_show(struct device *dev, 148 struct device_attribute *dev_attr, char *buf) 149 { 150 struct hv_device *hv_dev = device_to_hv_device(dev); 151 152 if (!hv_dev->channel) 153 return -ENODEV; 154 return sprintf(buf, "{%pUl}\n", 155 hv_dev->channel->offermsg.offer.if_instance.b); 156 } 157 static DEVICE_ATTR_RO(device_id); 158 159 static ssize_t modalias_show(struct device *dev, 160 struct device_attribute *dev_attr, char *buf) 161 { 162 struct hv_device *hv_dev = device_to_hv_device(dev); 163 char alias_name[VMBUS_ALIAS_LEN + 1]; 164 165 print_alias_name(hv_dev, alias_name); 166 return sprintf(buf, "vmbus:%s\n", alias_name); 167 } 168 static DEVICE_ATTR_RO(modalias); 169 170 static ssize_t server_monitor_pending_show(struct device *dev, 171 struct device_attribute *dev_attr, 172 char *buf) 173 { 174 struct hv_device *hv_dev = device_to_hv_device(dev); 175 176 if (!hv_dev->channel) 177 return -ENODEV; 178 return sprintf(buf, "%d\n", 179 channel_pending(hv_dev->channel, 180 vmbus_connection.monitor_pages[1])); 181 } 182 static DEVICE_ATTR_RO(server_monitor_pending); 183 184 static ssize_t client_monitor_pending_show(struct device *dev, 185 struct device_attribute *dev_attr, 186 char *buf) 187 { 188 struct hv_device *hv_dev = device_to_hv_device(dev); 189 190 if (!hv_dev->channel) 191 return -ENODEV; 192 return sprintf(buf, "%d\n", 193 channel_pending(hv_dev->channel, 194 vmbus_connection.monitor_pages[1])); 195 } 196 static DEVICE_ATTR_RO(client_monitor_pending); 197 198 static ssize_t server_monitor_latency_show(struct device *dev, 199 struct device_attribute *dev_attr, 200 char *buf) 201 { 202 struct hv_device *hv_dev = device_to_hv_device(dev); 203 204 if (!hv_dev->channel) 205 return -ENODEV; 206 return sprintf(buf, "%d\n", 207 channel_latency(hv_dev->channel, 208 vmbus_connection.monitor_pages[0])); 209 } 210 static DEVICE_ATTR_RO(server_monitor_latency); 211 212 static ssize_t client_monitor_latency_show(struct device *dev, 213 struct device_attribute *dev_attr, 214 char *buf) 215 { 216 struct hv_device *hv_dev = device_to_hv_device(dev); 217 218 if (!hv_dev->channel) 219 return -ENODEV; 220 return sprintf(buf, "%d\n", 221 channel_latency(hv_dev->channel, 222 vmbus_connection.monitor_pages[1])); 223 } 224 static DEVICE_ATTR_RO(client_monitor_latency); 225 226 static ssize_t server_monitor_conn_id_show(struct device *dev, 227 struct device_attribute *dev_attr, 228 char *buf) 229 { 230 struct hv_device *hv_dev = device_to_hv_device(dev); 231 232 if (!hv_dev->channel) 233 return -ENODEV; 234 return sprintf(buf, "%d\n", 235 channel_conn_id(hv_dev->channel, 236 vmbus_connection.monitor_pages[0])); 237 } 238 static DEVICE_ATTR_RO(server_monitor_conn_id); 239 240 static ssize_t client_monitor_conn_id_show(struct device *dev, 241 struct device_attribute *dev_attr, 242 char *buf) 243 { 244 struct hv_device *hv_dev = device_to_hv_device(dev); 245 246 if (!hv_dev->channel) 247 return -ENODEV; 248 return sprintf(buf, "%d\n", 249 channel_conn_id(hv_dev->channel, 250 vmbus_connection.monitor_pages[1])); 251 } 252 static DEVICE_ATTR_RO(client_monitor_conn_id); 253 254 static ssize_t out_intr_mask_show(struct device *dev, 255 struct device_attribute *dev_attr, char *buf) 256 { 257 struct hv_device *hv_dev = device_to_hv_device(dev); 258 struct hv_ring_buffer_debug_info outbound; 259 260 if (!hv_dev->channel) 261 return -ENODEV; 262 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 263 return sprintf(buf, "%d\n", outbound.current_interrupt_mask); 264 } 265 static DEVICE_ATTR_RO(out_intr_mask); 266 267 static ssize_t out_read_index_show(struct device *dev, 268 struct device_attribute *dev_attr, char *buf) 269 { 270 struct hv_device *hv_dev = device_to_hv_device(dev); 271 struct hv_ring_buffer_debug_info outbound; 272 273 if (!hv_dev->channel) 274 return -ENODEV; 275 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 276 return sprintf(buf, "%d\n", outbound.current_read_index); 277 } 278 static DEVICE_ATTR_RO(out_read_index); 279 280 static ssize_t out_write_index_show(struct device *dev, 281 struct device_attribute *dev_attr, 282 char *buf) 283 { 284 struct hv_device *hv_dev = device_to_hv_device(dev); 285 struct hv_ring_buffer_debug_info outbound; 286 287 if (!hv_dev->channel) 288 return -ENODEV; 289 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 290 return sprintf(buf, "%d\n", outbound.current_write_index); 291 } 292 static DEVICE_ATTR_RO(out_write_index); 293 294 static ssize_t out_read_bytes_avail_show(struct device *dev, 295 struct device_attribute *dev_attr, 296 char *buf) 297 { 298 struct hv_device *hv_dev = device_to_hv_device(dev); 299 struct hv_ring_buffer_debug_info outbound; 300 301 if (!hv_dev->channel) 302 return -ENODEV; 303 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 304 return sprintf(buf, "%d\n", outbound.bytes_avail_toread); 305 } 306 static DEVICE_ATTR_RO(out_read_bytes_avail); 307 308 static ssize_t out_write_bytes_avail_show(struct device *dev, 309 struct device_attribute *dev_attr, 310 char *buf) 311 { 312 struct hv_device *hv_dev = device_to_hv_device(dev); 313 struct hv_ring_buffer_debug_info outbound; 314 315 if (!hv_dev->channel) 316 return -ENODEV; 317 hv_ringbuffer_get_debuginfo(&hv_dev->channel->outbound, &outbound); 318 return sprintf(buf, "%d\n", outbound.bytes_avail_towrite); 319 } 320 static DEVICE_ATTR_RO(out_write_bytes_avail); 321 322 static ssize_t in_intr_mask_show(struct device *dev, 323 struct device_attribute *dev_attr, char *buf) 324 { 325 struct hv_device *hv_dev = device_to_hv_device(dev); 326 struct hv_ring_buffer_debug_info inbound; 327 328 if (!hv_dev->channel) 329 return -ENODEV; 330 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 331 return sprintf(buf, "%d\n", inbound.current_interrupt_mask); 332 } 333 static DEVICE_ATTR_RO(in_intr_mask); 334 335 static ssize_t in_read_index_show(struct device *dev, 336 struct device_attribute *dev_attr, char *buf) 337 { 338 struct hv_device *hv_dev = device_to_hv_device(dev); 339 struct hv_ring_buffer_debug_info inbound; 340 341 if (!hv_dev->channel) 342 return -ENODEV; 343 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 344 return sprintf(buf, "%d\n", inbound.current_read_index); 345 } 346 static DEVICE_ATTR_RO(in_read_index); 347 348 static ssize_t in_write_index_show(struct device *dev, 349 struct device_attribute *dev_attr, char *buf) 350 { 351 struct hv_device *hv_dev = device_to_hv_device(dev); 352 struct hv_ring_buffer_debug_info inbound; 353 354 if (!hv_dev->channel) 355 return -ENODEV; 356 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 357 return sprintf(buf, "%d\n", inbound.current_write_index); 358 } 359 static DEVICE_ATTR_RO(in_write_index); 360 361 static ssize_t in_read_bytes_avail_show(struct device *dev, 362 struct device_attribute *dev_attr, 363 char *buf) 364 { 365 struct hv_device *hv_dev = device_to_hv_device(dev); 366 struct hv_ring_buffer_debug_info inbound; 367 368 if (!hv_dev->channel) 369 return -ENODEV; 370 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 371 return sprintf(buf, "%d\n", inbound.bytes_avail_toread); 372 } 373 static DEVICE_ATTR_RO(in_read_bytes_avail); 374 375 static ssize_t in_write_bytes_avail_show(struct device *dev, 376 struct device_attribute *dev_attr, 377 char *buf) 378 { 379 struct hv_device *hv_dev = device_to_hv_device(dev); 380 struct hv_ring_buffer_debug_info inbound; 381 382 if (!hv_dev->channel) 383 return -ENODEV; 384 hv_ringbuffer_get_debuginfo(&hv_dev->channel->inbound, &inbound); 385 return sprintf(buf, "%d\n", inbound.bytes_avail_towrite); 386 } 387 static DEVICE_ATTR_RO(in_write_bytes_avail); 388 389 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */ 390 static struct attribute *vmbus_attrs[] = { 391 &dev_attr_id.attr, 392 &dev_attr_state.attr, 393 &dev_attr_monitor_id.attr, 394 &dev_attr_class_id.attr, 395 &dev_attr_device_id.attr, 396 &dev_attr_modalias.attr, 397 &dev_attr_server_monitor_pending.attr, 398 &dev_attr_client_monitor_pending.attr, 399 &dev_attr_server_monitor_latency.attr, 400 &dev_attr_client_monitor_latency.attr, 401 &dev_attr_server_monitor_conn_id.attr, 402 &dev_attr_client_monitor_conn_id.attr, 403 &dev_attr_out_intr_mask.attr, 404 &dev_attr_out_read_index.attr, 405 &dev_attr_out_write_index.attr, 406 &dev_attr_out_read_bytes_avail.attr, 407 &dev_attr_out_write_bytes_avail.attr, 408 &dev_attr_in_intr_mask.attr, 409 &dev_attr_in_read_index.attr, 410 &dev_attr_in_write_index.attr, 411 &dev_attr_in_read_bytes_avail.attr, 412 &dev_attr_in_write_bytes_avail.attr, 413 NULL, 414 }; 415 ATTRIBUTE_GROUPS(vmbus); 416 417 /* 418 * vmbus_uevent - add uevent for our device 419 * 420 * This routine is invoked when a device is added or removed on the vmbus to 421 * generate a uevent to udev in the userspace. The udev will then look at its 422 * rule and the uevent generated here to load the appropriate driver 423 * 424 * The alias string will be of the form vmbus:guid where guid is the string 425 * representation of the device guid (each byte of the guid will be 426 * represented with two hex characters. 427 */ 428 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env) 429 { 430 struct hv_device *dev = device_to_hv_device(device); 431 int ret; 432 char alias_name[VMBUS_ALIAS_LEN + 1]; 433 434 print_alias_name(dev, alias_name); 435 ret = add_uevent_var(env, "MODALIAS=vmbus:%s", alias_name); 436 return ret; 437 } 438 439 static const uuid_le null_guid; 440 441 static inline bool is_null_guid(const __u8 *guid) 442 { 443 if (memcmp(guid, &null_guid, sizeof(uuid_le))) 444 return false; 445 return true; 446 } 447 448 /* 449 * Return a matching hv_vmbus_device_id pointer. 450 * If there is no match, return NULL. 451 */ 452 static const struct hv_vmbus_device_id *hv_vmbus_get_id( 453 const struct hv_vmbus_device_id *id, 454 const __u8 *guid) 455 { 456 for (; !is_null_guid(id->guid); id++) 457 if (!memcmp(&id->guid, guid, sizeof(uuid_le))) 458 return id; 459 460 return NULL; 461 } 462 463 464 465 /* 466 * vmbus_match - Attempt to match the specified device to the specified driver 467 */ 468 static int vmbus_match(struct device *device, struct device_driver *driver) 469 { 470 struct hv_driver *drv = drv_to_hv_drv(driver); 471 struct hv_device *hv_dev = device_to_hv_device(device); 472 473 if (hv_vmbus_get_id(drv->id_table, hv_dev->dev_type.b)) 474 return 1; 475 476 return 0; 477 } 478 479 /* 480 * vmbus_probe - Add the new vmbus's child device 481 */ 482 static int vmbus_probe(struct device *child_device) 483 { 484 int ret = 0; 485 struct hv_driver *drv = 486 drv_to_hv_drv(child_device->driver); 487 struct hv_device *dev = device_to_hv_device(child_device); 488 const struct hv_vmbus_device_id *dev_id; 489 490 dev_id = hv_vmbus_get_id(drv->id_table, dev->dev_type.b); 491 if (drv->probe) { 492 ret = drv->probe(dev, dev_id); 493 if (ret != 0) 494 pr_err("probe failed for device %s (%d)\n", 495 dev_name(child_device), ret); 496 497 } else { 498 pr_err("probe not set for driver %s\n", 499 dev_name(child_device)); 500 ret = -ENODEV; 501 } 502 return ret; 503 } 504 505 /* 506 * vmbus_remove - Remove a vmbus device 507 */ 508 static int vmbus_remove(struct device *child_device) 509 { 510 struct hv_driver *drv = drv_to_hv_drv(child_device->driver); 511 struct hv_device *dev = device_to_hv_device(child_device); 512 513 if (drv->remove) 514 drv->remove(dev); 515 else 516 pr_err("remove not set for driver %s\n", 517 dev_name(child_device)); 518 519 return 0; 520 } 521 522 523 /* 524 * vmbus_shutdown - Shutdown a vmbus device 525 */ 526 static void vmbus_shutdown(struct device *child_device) 527 { 528 struct hv_driver *drv; 529 struct hv_device *dev = device_to_hv_device(child_device); 530 531 532 /* The device may not be attached yet */ 533 if (!child_device->driver) 534 return; 535 536 drv = drv_to_hv_drv(child_device->driver); 537 538 if (drv->shutdown) 539 drv->shutdown(dev); 540 541 return; 542 } 543 544 545 /* 546 * vmbus_device_release - Final callback release of the vmbus child device 547 */ 548 static void vmbus_device_release(struct device *device) 549 { 550 struct hv_device *hv_dev = device_to_hv_device(device); 551 552 kfree(hv_dev); 553 554 } 555 556 /* The one and only one */ 557 static struct bus_type hv_bus = { 558 .name = "vmbus", 559 .match = vmbus_match, 560 .shutdown = vmbus_shutdown, 561 .remove = vmbus_remove, 562 .probe = vmbus_probe, 563 .uevent = vmbus_uevent, 564 .dev_groups = vmbus_groups, 565 }; 566 567 struct onmessage_work_context { 568 struct work_struct work; 569 struct hv_message msg; 570 }; 571 572 static void vmbus_onmessage_work(struct work_struct *work) 573 { 574 struct onmessage_work_context *ctx; 575 576 ctx = container_of(work, struct onmessage_work_context, 577 work); 578 vmbus_onmessage(&ctx->msg); 579 kfree(ctx); 580 } 581 582 static void hv_process_timer_expiration(struct hv_message *msg, int cpu) 583 { 584 struct clock_event_device *dev = hv_context.clk_evt[cpu]; 585 586 if (dev->event_handler) 587 dev->event_handler(dev); 588 589 msg->header.message_type = HVMSG_NONE; 590 591 /* 592 * Make sure the write to MessageType (ie set to 593 * HVMSG_NONE) happens before we read the 594 * MessagePending and EOMing. Otherwise, the EOMing 595 * will not deliver any more messages since there is 596 * no empty slot 597 */ 598 mb(); 599 600 if (msg->header.message_flags.msg_pending) { 601 /* 602 * This will cause message queue rescan to 603 * possibly deliver another msg from the 604 * hypervisor 605 */ 606 wrmsrl(HV_X64_MSR_EOM, 0); 607 } 608 } 609 610 static void vmbus_on_msg_dpc(unsigned long data) 611 { 612 int cpu = smp_processor_id(); 613 void *page_addr = hv_context.synic_message_page[cpu]; 614 struct hv_message *msg = (struct hv_message *)page_addr + 615 VMBUS_MESSAGE_SINT; 616 struct onmessage_work_context *ctx; 617 618 while (1) { 619 if (msg->header.message_type == HVMSG_NONE) { 620 /* no msg */ 621 break; 622 } else { 623 ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC); 624 if (ctx == NULL) 625 continue; 626 INIT_WORK(&ctx->work, vmbus_onmessage_work); 627 memcpy(&ctx->msg, msg, sizeof(*msg)); 628 queue_work(vmbus_connection.work_queue, &ctx->work); 629 } 630 631 msg->header.message_type = HVMSG_NONE; 632 633 /* 634 * Make sure the write to MessageType (ie set to 635 * HVMSG_NONE) happens before we read the 636 * MessagePending and EOMing. Otherwise, the EOMing 637 * will not deliver any more messages since there is 638 * no empty slot 639 */ 640 mb(); 641 642 if (msg->header.message_flags.msg_pending) { 643 /* 644 * This will cause message queue rescan to 645 * possibly deliver another msg from the 646 * hypervisor 647 */ 648 wrmsrl(HV_X64_MSR_EOM, 0); 649 } 650 } 651 } 652 653 static void vmbus_isr(void) 654 { 655 int cpu = smp_processor_id(); 656 void *page_addr; 657 struct hv_message *msg; 658 union hv_synic_event_flags *event; 659 bool handled = false; 660 661 page_addr = hv_context.synic_event_page[cpu]; 662 if (page_addr == NULL) 663 return; 664 665 event = (union hv_synic_event_flags *)page_addr + 666 VMBUS_MESSAGE_SINT; 667 /* 668 * Check for events before checking for messages. This is the order 669 * in which events and messages are checked in Windows guests on 670 * Hyper-V, and the Windows team suggested we do the same. 671 */ 672 673 if ((vmbus_proto_version == VERSION_WS2008) || 674 (vmbus_proto_version == VERSION_WIN7)) { 675 676 /* Since we are a child, we only need to check bit 0 */ 677 if (sync_test_and_clear_bit(0, 678 (unsigned long *) &event->flags32[0])) { 679 handled = true; 680 } 681 } else { 682 /* 683 * Our host is win8 or above. The signaling mechanism 684 * has changed and we can directly look at the event page. 685 * If bit n is set then we have an interrup on the channel 686 * whose id is n. 687 */ 688 handled = true; 689 } 690 691 if (handled) 692 tasklet_schedule(hv_context.event_dpc[cpu]); 693 694 695 page_addr = hv_context.synic_message_page[cpu]; 696 msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; 697 698 /* Check if there are actual msgs to be processed */ 699 if (msg->header.message_type != HVMSG_NONE) { 700 if (msg->header.message_type == HVMSG_TIMER_EXPIRED) 701 hv_process_timer_expiration(msg, cpu); 702 else 703 tasklet_schedule(&msg_dpc); 704 } 705 } 706 707 /* 708 * vmbus_bus_init -Main vmbus driver initialization routine. 709 * 710 * Here, we 711 * - initialize the vmbus driver context 712 * - invoke the vmbus hv main init routine 713 * - get the irq resource 714 * - retrieve the channel offers 715 */ 716 static int vmbus_bus_init(int irq) 717 { 718 int ret; 719 720 /* Hypervisor initialization...setup hypercall page..etc */ 721 ret = hv_init(); 722 if (ret != 0) { 723 pr_err("Unable to initialize the hypervisor - 0x%x\n", ret); 724 return ret; 725 } 726 727 tasklet_init(&msg_dpc, vmbus_on_msg_dpc, 0); 728 729 ret = bus_register(&hv_bus); 730 if (ret) 731 goto err_cleanup; 732 733 hv_setup_vmbus_irq(vmbus_isr); 734 735 ret = hv_synic_alloc(); 736 if (ret) 737 goto err_alloc; 738 /* 739 * Initialize the per-cpu interrupt state and 740 * connect to the host. 741 */ 742 on_each_cpu(hv_synic_init, NULL, 1); 743 ret = vmbus_connect(); 744 if (ret) 745 goto err_alloc; 746 747 vmbus_request_offers(); 748 749 return 0; 750 751 err_alloc: 752 hv_synic_free(); 753 hv_remove_vmbus_irq(); 754 755 bus_unregister(&hv_bus); 756 757 err_cleanup: 758 hv_cleanup(); 759 760 return ret; 761 } 762 763 /** 764 * __vmbus_child_driver_register - Register a vmbus's driver 765 * @drv: Pointer to driver structure you want to register 766 * @owner: owner module of the drv 767 * @mod_name: module name string 768 * 769 * Registers the given driver with Linux through the 'driver_register()' call 770 * and sets up the hyper-v vmbus handling for this driver. 771 * It will return the state of the 'driver_register()' call. 772 * 773 */ 774 int __vmbus_driver_register(struct hv_driver *hv_driver, struct module *owner, const char *mod_name) 775 { 776 int ret; 777 778 pr_info("registering driver %s\n", hv_driver->name); 779 780 ret = vmbus_exists(); 781 if (ret < 0) 782 return ret; 783 784 hv_driver->driver.name = hv_driver->name; 785 hv_driver->driver.owner = owner; 786 hv_driver->driver.mod_name = mod_name; 787 hv_driver->driver.bus = &hv_bus; 788 789 ret = driver_register(&hv_driver->driver); 790 791 return ret; 792 } 793 EXPORT_SYMBOL_GPL(__vmbus_driver_register); 794 795 /** 796 * vmbus_driver_unregister() - Unregister a vmbus's driver 797 * @drv: Pointer to driver structure you want to un-register 798 * 799 * Un-register the given driver that was previous registered with a call to 800 * vmbus_driver_register() 801 */ 802 void vmbus_driver_unregister(struct hv_driver *hv_driver) 803 { 804 pr_info("unregistering driver %s\n", hv_driver->name); 805 806 if (!vmbus_exists()) 807 driver_unregister(&hv_driver->driver); 808 } 809 EXPORT_SYMBOL_GPL(vmbus_driver_unregister); 810 811 /* 812 * vmbus_device_create - Creates and registers a new child device 813 * on the vmbus. 814 */ 815 struct hv_device *vmbus_device_create(const uuid_le *type, 816 const uuid_le *instance, 817 struct vmbus_channel *channel) 818 { 819 struct hv_device *child_device_obj; 820 821 child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL); 822 if (!child_device_obj) { 823 pr_err("Unable to allocate device object for child device\n"); 824 return NULL; 825 } 826 827 child_device_obj->channel = channel; 828 memcpy(&child_device_obj->dev_type, type, sizeof(uuid_le)); 829 memcpy(&child_device_obj->dev_instance, instance, 830 sizeof(uuid_le)); 831 832 833 return child_device_obj; 834 } 835 836 /* 837 * vmbus_device_register - Register the child device 838 */ 839 int vmbus_device_register(struct hv_device *child_device_obj) 840 { 841 int ret = 0; 842 843 static atomic_t device_num = ATOMIC_INIT(0); 844 845 dev_set_name(&child_device_obj->device, "vmbus_0_%d", 846 atomic_inc_return(&device_num)); 847 848 child_device_obj->device.bus = &hv_bus; 849 child_device_obj->device.parent = &hv_acpi_dev->dev; 850 child_device_obj->device.release = vmbus_device_release; 851 852 /* 853 * Register with the LDM. This will kick off the driver/device 854 * binding...which will eventually call vmbus_match() and vmbus_probe() 855 */ 856 ret = device_register(&child_device_obj->device); 857 858 if (ret) 859 pr_err("Unable to register child device\n"); 860 else 861 pr_debug("child device %s registered\n", 862 dev_name(&child_device_obj->device)); 863 864 return ret; 865 } 866 867 /* 868 * vmbus_device_unregister - Remove the specified child device 869 * from the vmbus. 870 */ 871 void vmbus_device_unregister(struct hv_device *device_obj) 872 { 873 pr_debug("child device %s unregistered\n", 874 dev_name(&device_obj->device)); 875 876 /* 877 * Kick off the process of unregistering the device. 878 * This will call vmbus_remove() and eventually vmbus_device_release() 879 */ 880 device_unregister(&device_obj->device); 881 } 882 883 884 /* 885 * VMBUS is an acpi enumerated device. Get the the information we 886 * need from DSDT. 887 */ 888 889 static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx) 890 { 891 switch (res->type) { 892 case ACPI_RESOURCE_TYPE_IRQ: 893 irq = res->data.irq.interrupts[0]; 894 break; 895 896 case ACPI_RESOURCE_TYPE_ADDRESS64: 897 hyperv_mmio.start = res->data.address64.address.minimum; 898 hyperv_mmio.end = res->data.address64.address.maximum; 899 break; 900 } 901 902 return AE_OK; 903 } 904 905 static int vmbus_acpi_add(struct acpi_device *device) 906 { 907 acpi_status result; 908 int ret_val = -ENODEV; 909 910 hv_acpi_dev = device; 911 912 result = acpi_walk_resources(device->handle, METHOD_NAME__CRS, 913 vmbus_walk_resources, NULL); 914 915 if (ACPI_FAILURE(result)) 916 goto acpi_walk_err; 917 /* 918 * The parent of the vmbus acpi device (Gen2 firmware) is the VMOD that 919 * has the mmio ranges. Get that. 920 */ 921 if (device->parent) { 922 result = acpi_walk_resources(device->parent->handle, 923 METHOD_NAME__CRS, 924 vmbus_walk_resources, NULL); 925 926 if (ACPI_FAILURE(result)) 927 goto acpi_walk_err; 928 if (hyperv_mmio.start && hyperv_mmio.end) 929 request_resource(&iomem_resource, &hyperv_mmio); 930 } 931 ret_val = 0; 932 933 acpi_walk_err: 934 complete(&probe_event); 935 return ret_val; 936 } 937 938 static const struct acpi_device_id vmbus_acpi_device_ids[] = { 939 {"VMBUS", 0}, 940 {"VMBus", 0}, 941 {"", 0}, 942 }; 943 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids); 944 945 static struct acpi_driver vmbus_acpi_driver = { 946 .name = "vmbus", 947 .ids = vmbus_acpi_device_ids, 948 .ops = { 949 .add = vmbus_acpi_add, 950 }, 951 }; 952 953 static int __init hv_acpi_init(void) 954 { 955 int ret, t; 956 957 if (x86_hyper != &x86_hyper_ms_hyperv) 958 return -ENODEV; 959 960 init_completion(&probe_event); 961 962 /* 963 * Get irq resources first. 964 */ 965 ret = acpi_bus_register_driver(&vmbus_acpi_driver); 966 967 if (ret) 968 return ret; 969 970 t = wait_for_completion_timeout(&probe_event, 5*HZ); 971 if (t == 0) { 972 ret = -ETIMEDOUT; 973 goto cleanup; 974 } 975 976 if (irq <= 0) { 977 ret = -ENODEV; 978 goto cleanup; 979 } 980 981 ret = vmbus_bus_init(irq); 982 if (ret) 983 goto cleanup; 984 985 return 0; 986 987 cleanup: 988 acpi_bus_unregister_driver(&vmbus_acpi_driver); 989 hv_acpi_dev = NULL; 990 return ret; 991 } 992 993 static void __exit vmbus_exit(void) 994 { 995 hv_remove_vmbus_irq(); 996 vmbus_free_channels(); 997 bus_unregister(&hv_bus); 998 hv_cleanup(); 999 acpi_bus_unregister_driver(&vmbus_acpi_driver); 1000 } 1001 1002 1003 MODULE_LICENSE("GPL"); 1004 1005 subsys_initcall(hv_acpi_init); 1006 module_exit(vmbus_exit); 1007