drivers/staging/hv/vmbus_drv.c

   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/init.h>
  22 #include <linux/module.h>
  23 #include <linux/device.h>
  24 #include <linux/irq.h>
  25 #include <linux/interrupt.h>
  26 #include <linux/sysctl.h>
  27 #include <linux/pci.h>
  28 #include <linux/dmi.h>
  29 #include <linux/slab.h>
  30 #include <linux/completion.h>
  31 #include "version_info.h"
  32 #include "hv_api.h"
  33 #include "logging.h"
  34 #include "vmbus.h"
  35 #include "channel.h"
  36 #include "vmbus_private.h"
  37
  38
  39 /* FIXME! We need to do this dynamically for PIC and APIC system */
  40 #define VMBUS_IRQ               0x5
  41 #define VMBUS_IRQ_VECTOR        IRQ5_VECTOR
  42
  43 /* Main vmbus driver data structure */
  44 struct vmbus_driver_context {
  45
  46         struct bus_type bus;
  47         struct tasklet_struct msg_dpc;
  48         struct tasklet_struct event_dpc;
  49
  50         /* The bus root device */
  51         struct hv_device device_ctx;
  52 };
  53
  54 static int vmbus_match(struct device *device, struct device_driver *driver);
  55 static int vmbus_probe(struct device *device);
  56 static int vmbus_remove(struct device *device);
  57 static void vmbus_shutdown(struct device *device);
  58 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
  59
  60 static irqreturn_t vmbus_isr(int irq, void *dev_id);
  61
  62 static void vmbus_device_release(struct device *device);
  63 static void vmbus_bus_release(struct device *device);
  64
  65 static ssize_t vmbus_show_device_attr(struct device *dev,
  66                                       struct device_attribute *dev_attr,
  67                                       char *buf);
  68
  69
  70 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
  71 EXPORT_SYMBOL(vmbus_loglevel);
  72         /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
  73         /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
  74
  75 static int vmbus_irq = VMBUS_IRQ;
  76
  77 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
  78 static struct device_attribute vmbus_device_attrs[] = {
  79         __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
  80         __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
  81         __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
  82         __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
  83         __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
  84
  85         __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
  86         __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
  87         __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
  88
  89         __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
  90         __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
  91         __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
  92
  93         __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
  94         __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
  95         __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
  96         __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
  97         __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
  98
  99         __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
 100         __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
 101         __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
 102         __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 103         __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 104         __ATTR_NULL
 105 };
 106
 107 /* The one and only one */
 108 static struct vmbus_driver_context vmbus_drv = {
 109         .bus.name =             "vmbus",
 110         .bus.match =            vmbus_match,
 111         .bus.shutdown =         vmbus_shutdown,
 112         .bus.remove =           vmbus_remove,
 113         .bus.probe =            vmbus_probe,
 114         .bus.uevent =           vmbus_uevent,
 115         .bus.dev_attrs =        vmbus_device_attrs,
 116 };
 117
 118 static const char *driver_name = "hyperv";
 119
 120 /*
 121  * Windows vmbus does not defined this.
 122  * We defined this to be consistent with other devices
 123  */
 124 /* {c5295816-f63a-4d5f-8d1a-4daf999ca185} */
 125 static const struct hv_guid device_type = {
 126         .data = {
 127                 0x16, 0x58, 0x29, 0xc5, 0x3a, 0xf6, 0x5f, 0x4d,
 128                 0x8d, 0x1a, 0x4d, 0xaf, 0x99, 0x9c, 0xa1, 0x85
 129         }
 130 };
 131
 132 /* {ac3760fc-9adf-40aa-9427-a70ed6de95c5} */
 133 static const struct hv_guid device_id = {
 134         .data = {
 135                 0xfc, 0x60, 0x37, 0xac, 0xdf, 0x9a, 0xaa, 0x40,
 136                 0x94, 0x27, 0xa7, 0x0e, 0xd6, 0xde, 0x95, 0xc5
 137         }
 138 };
 139
 140 static struct hv_device *vmbus_device; /* vmbus root device */
 141
 142 /*
 143  * vmbus_child_dev_add - Registers the child device with the vmbus
 144  */
 145 int vmbus_child_dev_add(struct hv_device *child_dev)
 146 {
 147         return vmbus_child_device_register(vmbus_device, child_dev);
 148 }
 149
 150 /*
 151  * vmbus_dev_add - Callback when the root bus device is added
 152  */
 153 static int vmbus_dev_add(struct hv_device *dev, void *info)
 154 {
 155         u32 *irqvector = info;
 156         int ret;
 157
 158         vmbus_device = dev;
 159
 160         memcpy(&vmbus_device->dev_type, &device_type, sizeof(struct hv_guid));
 161         memcpy(&vmbus_device->dev_instance, &device_id,
 162                sizeof(struct hv_guid));
 163
 164         /* strcpy(dev->name, "vmbus"); */
 165         /* SynIC setup... */
 166         on_each_cpu(hv_synic_init, (void *)irqvector, 1);
 167
 168         /* Connect to VMBus in the root partition */
 169         ret = vmbus_connect();
 170
 171         /* VmbusSendEvent(device->localPortId+1); */
 172         return ret;
 173 }
 174
 175
 176 struct onmessage_work_context {
 177         struct work_struct work;
 178         struct hv_message msg;
 179 };
 180
 181 static void vmbus_onmessage_work(struct work_struct *work)
 182 {
 183         struct onmessage_work_context *ctx;
 184
 185         ctx = container_of(work, struct onmessage_work_context,
 186                            work);
 187         vmbus_onmessage(&ctx->msg);
 188         kfree(ctx);
 189 }
 190
 191 /*
 192  * vmbus_on_msg_dpc - DPC routine to handle messages from the hypervisior
 193  */
 194 static void vmbus_on_msg_dpc(unsigned long data)
 195 {
 196         int cpu = smp_processor_id();
 197         void *page_addr = hv_context.synic_message_page[cpu];
 198         struct hv_message *msg = (struct hv_message *)page_addr +
 199                                   VMBUS_MESSAGE_SINT;
 200         struct onmessage_work_context *ctx;
 201
 202         while (1) {
 203                 if (msg->header.message_type == HVMSG_NONE) {
 204                         /* no msg */
 205                         break;
 206                 } else {
 207                         ctx = kmalloc(sizeof(*ctx), GFP_ATOMIC);
 208                         if (ctx == NULL)
 209                                 continue;
 210                         INIT_WORK(&ctx->work, vmbus_onmessage_work);
 211                         memcpy(&ctx->msg, msg, sizeof(*msg));
 212                         queue_work(vmbus_connection.work_queue, &ctx->work);
 213                 }
 214
 215                 msg->header.message_type = HVMSG_NONE;
 216
 217                 /*
 218                  * Make sure the write to MessageType (ie set to
 219                  * HVMSG_NONE) happens before we read the
 220                  * MessagePending and EOMing. Otherwise, the EOMing
 221                  * will not deliver any more messages since there is
 222                  * no empty slot
 223                  */
 224                 mb();
 225
 226                 if (msg->header.message_flags.msg_pending) {
 227                         /*
 228                          * This will cause message queue rescan to
 229                          * possibly deliver another msg from the
 230                          * hypervisor
 231                          */
 232                         wrmsrl(HV_X64_MSR_EOM, 0);
 233                 }
 234         }
 235 }
 236
 237 /*
 238  * vmbus_on_isr - ISR routine
 239  */
 240 static int vmbus_on_isr(void)
 241 {
 242         int ret = 0;
 243         int cpu = smp_processor_id();
 244         void *page_addr;
 245         struct hv_message *msg;
 246         union hv_synic_event_flags *event;
 247
 248         page_addr = hv_context.synic_message_page[cpu];
 249         msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT;
 250
 251         /* Check if there are actual msgs to be process */
 252         if (msg->header.message_type != HVMSG_NONE) {
 253                 DPRINT_DBG(VMBUS, "received msg type %d size %d",
 254                                 msg->header.message_type,
 255                                 msg->header.payload_size);
 256                 ret |= 0x1;
 257         }
 258
 259         /* TODO: Check if there are events to be process */
 260         page_addr = hv_context.synic_event_page[cpu];
 261         event = (union hv_synic_event_flags *)page_addr + VMBUS_MESSAGE_SINT;
 262
 263         /* Since we are a child, we only need to check bit 0 */
 264         if (test_and_clear_bit(0, (unsigned long *) &event->flags32[0])) {
 265                 DPRINT_DBG(VMBUS, "received event %d", event->flags32[0]);
 266                 ret |= 0x2;
 267         }
 268
 269         return ret;
 270 }
 271
 272 static void get_channel_info(struct hv_device *device,
 273                              struct hv_device_info *info)
 274 {
 275         struct vmbus_channel_debug_info debug_info;
 276
 277         if (!device->channel)
 278                 return;
 279
 280         vmbus_get_debug_info(device->channel, &debug_info);
 281
 282         info->chn_id = debug_info.relid;
 283         info->chn_state = debug_info.state;
 284         memcpy(&info->chn_type, &debug_info.interfacetype,
 285                sizeof(struct hv_guid));
 286         memcpy(&info->chn_instance, &debug_info.interface_instance,
 287                sizeof(struct hv_guid));
 288
 289         info->monitor_id = debug_info.monitorid;
 290
 291         info->server_monitor_pending = debug_info.servermonitor_pending;
 292         info->server_monitor_latency = debug_info.servermonitor_latency;
 293         info->server_monitor_conn_id = debug_info.servermonitor_connectionid;
 294
 295         info->client_monitor_pending = debug_info.clientmonitor_pending;
 296         info->client_monitor_latency = debug_info.clientmonitor_latency;
 297         info->client_monitor_conn_id = debug_info.clientmonitor_connectionid;
 298
 299         info->inbound.int_mask = debug_info.inbound.current_interrupt_mask;
 300         info->inbound.read_idx = debug_info.inbound.current_read_index;
 301         info->inbound.write_idx = debug_info.inbound.current_write_index;
 302         info->inbound.bytes_avail_toread =
 303                 debug_info.inbound.bytes_avail_toread;
 304         info->inbound.bytes_avail_towrite =
 305                 debug_info.inbound.bytes_avail_towrite;
 306
 307         info->outbound.int_mask =
 308                 debug_info.outbound.current_interrupt_mask;
 309         info->outbound.read_idx = debug_info.outbound.current_read_index;
 310         info->outbound.write_idx = debug_info.outbound.current_write_index;
 311         info->outbound.bytes_avail_toread =
 312                 debug_info.outbound.bytes_avail_toread;
 313         info->outbound.bytes_avail_towrite =
 314                 debug_info.outbound.bytes_avail_towrite;
 315 }
 316
 317 /*
 318  * vmbus_show_device_attr - Show the device attribute in sysfs.
 319  *
 320  * This is invoked when user does a
 321  * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
 322  */
 323 static ssize_t vmbus_show_device_attr(struct device *dev,
 324                                       struct device_attribute *dev_attr,
 325                                       char *buf)
 326 {
 327         struct hv_device *device_ctx = device_to_hv_device(dev);
 328         struct hv_device_info device_info;
 329
 330         memset(&device_info, 0, sizeof(struct hv_device_info));
 331
 332         get_channel_info(device_ctx, &device_info);
 333
 334         if (!strcmp(dev_attr->attr.name, "class_id")) {
 335                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 336                                "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 337                                device_info.chn_type.data[3],
 338                                device_info.chn_type.data[2],
 339                                device_info.chn_type.data[1],
 340                                device_info.chn_type.data[0],
 341                                device_info.chn_type.data[5],
 342                                device_info.chn_type.data[4],
 343                                device_info.chn_type.data[7],
 344                                device_info.chn_type.data[6],
 345                                device_info.chn_type.data[8],
 346                                device_info.chn_type.data[9],
 347                                device_info.chn_type.data[10],
 348                                device_info.chn_type.data[11],
 349                                device_info.chn_type.data[12],
 350                                device_info.chn_type.data[13],
 351                                device_info.chn_type.data[14],
 352                                device_info.chn_type.data[15]);
 353         } else if (!strcmp(dev_attr->attr.name, "device_id")) {
 354                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 355                                "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 356                                device_info.chn_instance.data[3],
 357                                device_info.chn_instance.data[2],
 358                                device_info.chn_instance.data[1],
 359                                device_info.chn_instance.data[0],
 360                                device_info.chn_instance.data[5],
 361                                device_info.chn_instance.data[4],
 362                                device_info.chn_instance.data[7],
 363                                device_info.chn_instance.data[6],
 364                                device_info.chn_instance.data[8],
 365                                device_info.chn_instance.data[9],
 366                                device_info.chn_instance.data[10],
 367                                device_info.chn_instance.data[11],
 368                                device_info.chn_instance.data[12],
 369                                device_info.chn_instance.data[13],
 370                                device_info.chn_instance.data[14],
 371                                device_info.chn_instance.data[15]);
 372         } else if (!strcmp(dev_attr->attr.name, "state")) {
 373                 return sprintf(buf, "%d\n", device_info.chn_state);
 374         } else if (!strcmp(dev_attr->attr.name, "id")) {
 375                 return sprintf(buf, "%d\n", device_info.chn_id);
 376         } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
 377                 return sprintf(buf, "%d\n", device_info.outbound.int_mask);
 378         } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
 379                 return sprintf(buf, "%d\n", device_info.outbound.read_idx);
 380         } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
 381                 return sprintf(buf, "%d\n", device_info.outbound.write_idx);
 382         } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
 383                 return sprintf(buf, "%d\n",
 384                                device_info.outbound.bytes_avail_toread);
 385         } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
 386                 return sprintf(buf, "%d\n",
 387                                device_info.outbound.bytes_avail_towrite);
 388         } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
 389                 return sprintf(buf, "%d\n", device_info.inbound.int_mask);
 390         } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
 391                 return sprintf(buf, "%d\n", device_info.inbound.read_idx);
 392         } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
 393                 return sprintf(buf, "%d\n", device_info.inbound.write_idx);
 394         } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
 395                 return sprintf(buf, "%d\n",
 396                                device_info.inbound.bytes_avail_toread);
 397         } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
 398                 return sprintf(buf, "%d\n",
 399                                device_info.inbound.bytes_avail_towrite);
 400         } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
 401                 return sprintf(buf, "%d\n", device_info.monitor_id);
 402         } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
 403                 return sprintf(buf, "%d\n", device_info.server_monitor_pending);
 404         } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
 405                 return sprintf(buf, "%d\n", device_info.server_monitor_latency);
 406         } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
 407                 return sprintf(buf, "%d\n",
 408                                device_info.server_monitor_conn_id);
 409         } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
 410                 return sprintf(buf, "%d\n", device_info.client_monitor_pending);
 411         } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
 412                 return sprintf(buf, "%d\n", device_info.client_monitor_latency);
 413         } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
 414                 return sprintf(buf, "%d\n",
 415                                device_info.client_monitor_conn_id);
 416         } else {
 417                 return 0;
 418         }
 419 }
 420
 421 /*
 422  * vmbus_bus_init -Main vmbus driver initialization routine.
 423  *
 424  * Here, we
 425  *      - initialize the vmbus driver context
 426  *      - setup various driver entry points
 427  *      - invoke the vmbus hv main init routine
 428  *      - get the irq resource
 429  *      - invoke the vmbus to add the vmbus root device
 430  *      - setup the vmbus root device
 431  *      - retrieve the channel offers
 432  */
 433 static int vmbus_bus_init(void)
 434 {
 435         struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
 436         struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
 437         int ret;
 438         unsigned int vector;
 439
 440         DPRINT_INFO(VMBUS, "+++++++ HV Driver version = %s +++++++",
 441                     HV_DRV_VERSION);
 442         DPRINT_INFO(VMBUS, "+++++++ Vmbus supported version = %d +++++++",
 443                         VMBUS_REVISION_NUMBER);
 444         DPRINT_INFO(VMBUS, "+++++++ Vmbus using SINT %d +++++++",
 445                         VMBUS_MESSAGE_SINT);
 446         DPRINT_DBG(VMBUS, "sizeof(vmbus_channel_packet_page_buffer)=%zd, "
 447                         "sizeof(VMBUS_CHANNEL_PACKET_MULITPAGE_BUFFER)=%zd",
 448                         sizeof(struct vmbus_channel_packet_page_buffer),
 449                         sizeof(struct vmbus_channel_packet_multipage_buffer));
 450
 451
 452         /* Hypervisor initialization...setup hypercall page..etc */
 453         ret = hv_init();
 454         if (ret != 0) {
 455                 DPRINT_ERR(VMBUS, "Unable to initialize the hypervisor - 0x%x",
 456                                 ret);
 457                 goto cleanup;
 458         }
 459
 460
 461         vmbus_drv_ctx->bus.name = driver_name;
 462
 463         /* Initialize the bus context */
 464         tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_on_msg_dpc,
 465                      (unsigned long)NULL);
 466         tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_on_event,
 467                      (unsigned long)NULL);
 468
 469         /* Now, register the bus  with LDM */
 470         ret = bus_register(&vmbus_drv_ctx->bus);
 471         if (ret) {
 472                 ret = -1;
 473                 goto cleanup;
 474         }
 475
 476         /* Get the interrupt resource */
 477         ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
 478                           driver_name, NULL);
 479
 480         if (ret != 0) {
 481                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
 482                            vmbus_irq);
 483
 484                 bus_unregister(&vmbus_drv_ctx->bus);
 485
 486                 ret = -1;
 487                 goto cleanup;
 488         }
 489         vector = VMBUS_IRQ_VECTOR;
 490
 491         DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
 492
 493         /* Add the root device */
 494         memset(dev_ctx, 0, sizeof(struct hv_device));
 495
 496         ret = vmbus_dev_add(dev_ctx, &vector);
 497         if (ret != 0) {
 498                 DPRINT_ERR(VMBUS_DRV,
 499                            "ERROR - Unable to add vmbus root device");
 500
 501                 free_irq(vmbus_irq, NULL);
 502
 503                 bus_unregister(&vmbus_drv_ctx->bus);
 504
 505                 ret = -1;
 506                 goto cleanup;
 507         }
 508         /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
 509         dev_set_name(&dev_ctx->device, "vmbus_0_0");
 510
 511         /* No need to bind a driver to the root device. */
 512         dev_ctx->device.parent = NULL;
 513         /* NULL; vmbus_remove() does not get invoked */
 514         dev_ctx->device.bus = &vmbus_drv_ctx->bus;
 515
 516         /* Setup the device dispatch table */
 517         dev_ctx->device.release = vmbus_bus_release;
 518
 519         /* register the  root device */
 520         ret = device_register(&dev_ctx->device);
 521         if (ret) {
 522                 DPRINT_ERR(VMBUS_DRV,
 523                            "ERROR - Unable to register vmbus root device");
 524
 525                 free_irq(vmbus_irq, NULL);
 526                 bus_unregister(&vmbus_drv_ctx->bus);
 527
 528                 ret = -1;
 529                 goto cleanup;
 530         }
 531
 532         vmbus_request_offers();
 533         wait_for_completion(&hv_channel_ready);
 534
 535 cleanup:
 536         return ret;
 537 }
 538
 539 /*
 540  * vmbus_bus_exit - Terminate the vmbus driver.
 541  *
 542  * This routine is opposite of vmbus_bus_init()
 543  */
 544 static void vmbus_bus_exit(void)
 545 {
 546         struct vmbus_driver_context *vmbus_drv_ctx = &vmbus_drv;
 547
 548         struct hv_device *dev_ctx = &vmbus_drv.device_ctx;
 549
 550         vmbus_release_unattached_channels();
 551         vmbus_disconnect();
 552         on_each_cpu(hv_synic_cleanup, NULL, 1);
 553
 554         hv_cleanup();
 555
 556         /* Unregister the root bus device */
 557         device_unregister(&dev_ctx->device);
 558
 559         bus_unregister(&vmbus_drv_ctx->bus);
 560
 561         free_irq(vmbus_irq, NULL);
 562
 563         tasklet_kill(&vmbus_drv_ctx->msg_dpc);
 564         tasklet_kill(&vmbus_drv_ctx->event_dpc);
 565 }
 566
 567
 568 /**
 569  * vmbus_child_driver_register() - Register a vmbus's child driver
 570  * @drv:        Pointer to driver structure you want to register
 571  *
 572  *
 573  * Registers the given driver with Linux through the 'driver_register()' call
 574  * And sets up the hyper-v vmbus handling for this driver.
 575  * It will return the state of the 'driver_register()' call.
 576  *
 577  * Mainly used by Hyper-V drivers.
 578  */
 579 int vmbus_child_driver_register(struct device_driver *drv)
 580 {
 581         int ret;
 582
 583         DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
 584                     drv, drv->name);
 585
 586         /* The child driver on this vmbus */
 587         drv->bus = &vmbus_drv.bus;
 588
 589         ret = driver_register(drv);
 590
 591         vmbus_request_offers();
 592
 593         return ret;
 594 }
 595 EXPORT_SYMBOL(vmbus_child_driver_register);
 596
 597 /**
 598  * vmbus_child_driver_unregister() - Unregister a vmbus's child driver
 599  * @drv:        Pointer to driver structure you want to un-register
 600  *
 601  *
 602  * Un-register the given driver with Linux through the 'driver_unregister()'
 603  * call. And ungegisters the driver from the Hyper-V vmbus handler.
 604  *
 605  * Mainly used by Hyper-V drivers.
 606  */
 607 void vmbus_child_driver_unregister(struct device_driver *drv)
 608 {
 609         DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
 610                     drv, drv->name);
 611
 612         driver_unregister(drv);
 613
 614         drv->bus = NULL;
 615 }
 616 EXPORT_SYMBOL(vmbus_child_driver_unregister);
 617
 618 /*
 619  * vmbus_child_device_create - Creates and registers a new child device
 620  * on the vmbus.
 621  */
 622 struct hv_device *vmbus_child_device_create(struct hv_guid *type,
 623                                             struct hv_guid *instance,
 624                                             struct vmbus_channel *channel)
 625 {
 626         struct hv_device *child_device_obj;
 627
 628         /* Allocate the new child device */
 629         child_device_obj = kzalloc(sizeof(struct hv_device), GFP_KERNEL);
 630         if (!child_device_obj) {
 631                 DPRINT_ERR(VMBUS_DRV,
 632                         "unable to allocate device_context for child device");
 633                 return NULL;
 634         }
 635
 636         DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
 637                 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 638                 "%02x%02x%02x%02x%02x%02x%02x%02x},"
 639                 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 640                 "%02x%02x%02x%02x%02x%02x%02x%02x}",
 641                 &child_device_obj->device,
 642                 type->data[3], type->data[2], type->data[1], type->data[0],
 643                 type->data[5], type->data[4], type->data[7], type->data[6],
 644                 type->data[8], type->data[9], type->data[10], type->data[11],
 645                 type->data[12], type->data[13], type->data[14], type->data[15],
 646                 instance->data[3], instance->data[2],
 647                 instance->data[1], instance->data[0],
 648                 instance->data[5], instance->data[4],
 649                 instance->data[7], instance->data[6],
 650                 instance->data[8], instance->data[9],
 651                 instance->data[10], instance->data[11],
 652                 instance->data[12], instance->data[13],
 653                 instance->data[14], instance->data[15]);
 654
 655         child_device_obj->channel = channel;
 656         memcpy(&child_device_obj->dev_type, type, sizeof(struct hv_guid));
 657         memcpy(&child_device_obj->dev_instance, instance,
 658                sizeof(struct hv_guid));
 659
 660
 661         return child_device_obj;
 662 }
 663
 664 /*
 665  * vmbus_child_device_register - Register the child device on the specified bus
 666  */
 667 int vmbus_child_device_register(struct hv_device *root_device_obj,
 668                                 struct hv_device *child_device_obj)
 669 {
 670         int ret = 0;
 671
 672         static atomic_t device_num = ATOMIC_INIT(0);
 673
 674         DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
 675                    child_device_obj);
 676
 677         /* Set the device name. Otherwise, device_register() will fail. */
 678         dev_set_name(&child_device_obj->device, "vmbus_0_%d",
 679                      atomic_inc_return(&device_num));
 680
 681         /* The new device belongs to this bus */
 682         child_device_obj->device.bus = &vmbus_drv.bus; /* device->dev.bus; */
 683         child_device_obj->device.parent = &root_device_obj->device;
 684         child_device_obj->device.release = vmbus_device_release;
 685
 686         /*
 687          * Register with the LDM. This will kick off the driver/device
 688          * binding...which will eventually call vmbus_match() and vmbus_probe()
 689          */
 690         ret = device_register(&child_device_obj->device);
 691
 692         /* vmbus_probe() error does not get propergate to device_register(). */
 693         ret = child_device_obj->probe_error;
 694
 695         if (ret)
 696                 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
 697                            &child_device_obj->device);
 698         else
 699                 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
 700                             &child_device_obj->device);
 701
 702         return ret;
 703 }
 704
 705 /*
 706  * vmbus_child_device_unregister - Remove the specified child device
 707  * from the vmbus.
 708  */
 709 void vmbus_child_device_unregister(struct hv_device *device_obj)
 710 {
 711
 712         DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
 713                     &device_obj->device);
 714
 715         /*
 716          * Kick off the process of unregistering the device.
 717          * This will call vmbus_remove() and eventually vmbus_device_release()
 718          */
 719         device_unregister(&device_obj->device);
 720
 721         DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
 722                     &device_obj->device);
 723 }
 724
 725 /*
 726  * vmbus_uevent - add uevent for our device
 727  *
 728  * This routine is invoked when a device is added or removed on the vmbus to
 729  * generate a uevent to udev in the userspace. The udev will then look at its
 730  * rule and the uevent generated here to load the appropriate driver
 731  */
 732 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
 733 {
 734         struct hv_device *dev = device_to_hv_device(device);
 735         int ret;
 736
 737         DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
 738                     "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 739                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 740                     dev->dev_type.data[3], dev->dev_type.data[2],
 741                     dev->dev_type.data[1], dev->dev_type.data[0],
 742                     dev->dev_type.data[5], dev->dev_type.data[4],
 743                     dev->dev_type.data[7], dev->dev_type.data[6],
 744                     dev->dev_type.data[8], dev->dev_type.data[9],
 745                     dev->dev_type.data[10],
 746                     dev->dev_type.data[11],
 747                     dev->dev_type.data[12],
 748                     dev->dev_type.data[13],
 749                     dev->dev_type.data[14],
 750                     dev->dev_type.data[15]);
 751
 752         ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
 753                              "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 754                              "%02x%02x%02x%02x%02x%02x%02x%02x}",
 755                              dev->dev_type.data[3],
 756                              dev->dev_type.data[2],
 757                              dev->dev_type.data[1],
 758                              dev->dev_type.data[0],
 759                              dev->dev_type.data[5],
 760                              dev->dev_type.data[4],
 761                              dev->dev_type.data[7],
 762                              dev->dev_type.data[6],
 763                              dev->dev_type.data[8],
 764                              dev->dev_type.data[9],
 765                              dev->dev_type.data[10],
 766                              dev->dev_type.data[11],
 767                              dev->dev_type.data[12],
 768                              dev->dev_type.data[13],
 769                              dev->dev_type.data[14],
 770                              dev->dev_type.data[15]);
 771
 772         if (ret)
 773                 return ret;
 774
 775         ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
 776                              "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 777                              "%02x%02x%02x%02x%02x%02x%02x%02x}",
 778                              dev->dev_instance.data[3],
 779                              dev->dev_instance.data[2],
 780                              dev->dev_instance.data[1],
 781                              dev->dev_instance.data[0],
 782                              dev->dev_instance.data[5],
 783                              dev->dev_instance.data[4],
 784                              dev->dev_instance.data[7],
 785                              dev->dev_instance.data[6],
 786                              dev->dev_instance.data[8],
 787                              dev->dev_instance.data[9],
 788                              dev->dev_instance.data[10],
 789                              dev->dev_instance.data[11],
 790                              dev->dev_instance.data[12],
 791                              dev->dev_instance.data[13],
 792                              dev->dev_instance.data[14],
 793                              dev->dev_instance.data[15]);
 794         if (ret)
 795                 return ret;
 796
 797         return 0;
 798 }
 799
 800 /*
 801  * vmbus_match - Attempt to match the specified device to the specified driver
 802  */
 803 static int vmbus_match(struct device *device, struct device_driver *driver)
 804 {
 805         int match = 0;
 806         struct hv_driver *drv = drv_to_hv_drv(driver);
 807         struct hv_device *device_ctx = device_to_hv_device(device);
 808
 809         /* We found our driver ? */
 810         if (memcmp(&device_ctx->dev_type, &drv->dev_type,
 811                    sizeof(struct hv_guid)) == 0) {
 812
 813                 device_ctx->drv = drv->priv;
 814                 DPRINT_INFO(VMBUS_DRV,
 815                             "device object (%p) set to driver object (%p)",
 816                             &device_ctx,
 817                             device_ctx->drv);
 818
 819                 match = 1;
 820         }
 821         return match;
 822 }
 823
 824 /*
 825  * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
 826  *
 827  * We need a callback because we cannot invoked device_unregister() inside
 828  * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
 829  * i.e. we cannot call device_unregister() inside device_register()
 830  */
 831 static void vmbus_probe_failed_cb(struct work_struct *context)
 832 {
 833         struct hv_device *device_ctx = (struct hv_device *)context;
 834
 835         /*
 836          * Kick off the process of unregistering the device.
 837          * This will call vmbus_remove() and eventually vmbus_device_release()
 838          */
 839         device_unregister(&device_ctx->device);
 840
 841         /* put_device(&device_ctx->device); */
 842 }
 843
 844 /*
 845  * vmbus_probe - Add the new vmbus's child device
 846  */
 847 static int vmbus_probe(struct device *child_device)
 848 {
 849         int ret = 0;
 850         struct hv_driver *drv =
 851                         drv_to_hv_drv(child_device->driver);
 852         struct hv_device *dev = device_to_hv_device(child_device);
 853
 854         /* Let the specific open-source driver handles the probe if it can */
 855         if (drv->driver.probe) {
 856                 ret = dev->probe_error =
 857                 drv->driver.probe(child_device);
 858                 if (ret != 0) {
 859                         DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
 860                                    "(%p) on driver %s (%d)...",
 861                                    dev_name(child_device), child_device,
 862                                    child_device->driver->name, ret);
 863
 864                         INIT_WORK(&dev->probe_failed_work_item,
 865                                   vmbus_probe_failed_cb);
 866                         schedule_work(&dev->probe_failed_work_item);
 867                 }
 868         } else {
 869                 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
 870                            child_device->driver->name);
 871                 ret = -1;
 872         }
 873         return ret;
 874 }
 875
 876 /*
 877  * vmbus_remove - Remove a vmbus device
 878  */
 879 static int vmbus_remove(struct device *child_device)
 880 {
 881         int ret;
 882         struct hv_driver *drv;
 883
 884         /* Special case root bus device */
 885         if (child_device->parent == NULL) {
 886                 /*
 887                  * No-op since it is statically defined and handle in
 888                  * vmbus_bus_exit()
 889                  */
 890                 return 0;
 891         }
 892
 893         if (child_device->driver) {
 894                 drv = drv_to_hv_drv(child_device->driver);
 895
 896                 /*
 897                  * Let the specific open-source driver handles the removal if
 898                  * it can
 899                  */
 900                 if (drv->driver.remove) {
 901                         ret = drv->driver.remove(child_device);
 902                 } else {
 903                         DPRINT_ERR(VMBUS_DRV,
 904                                    "remove() method not set for driver - %s",
 905                                    child_device->driver->name);
 906                         ret = -1;
 907                 }
 908         }
 909
 910         return 0;
 911 }
 912
 913 /*
 914  * vmbus_shutdown - Shutdown a vmbus device
 915  */
 916 static void vmbus_shutdown(struct device *child_device)
 917 {
 918         struct hv_driver *drv;
 919
 920         /* Special case root bus device */
 921         if (child_device->parent == NULL) {
 922                 /*
 923                  * No-op since it is statically defined and handle in
 924                  * vmbus_bus_exit()
 925                  */
 926                 return;
 927         }
 928
 929         /* The device may not be attached yet */
 930         if (!child_device->driver)
 931                 return;
 932
 933         drv = drv_to_hv_drv(child_device->driver);
 934
 935         /* Let the specific open-source driver handles the removal if it can */
 936         if (drv->driver.shutdown)
 937                 drv->driver.shutdown(child_device);
 938
 939         return;
 940 }
 941
 942 /*
 943  * vmbus_bus_release - Final callback release of the vmbus root device
 944  */
 945 static void vmbus_bus_release(struct device *device)
 946 {
 947         /* FIXME */
 948         /* Empty release functions are a bug, or a major sign
 949          * of a problem design, this MUST BE FIXED! */
 950         dev_err(device, "%s needs to be fixed!\n", __func__);
 951         WARN_ON(1);
 952 }
 953
 954 /*
 955  * vmbus_device_release - Final callback release of the vmbus child device
 956  */
 957 static void vmbus_device_release(struct device *device)
 958 {
 959         struct hv_device *device_ctx = device_to_hv_device(device);
 960
 961         kfree(device_ctx);
 962
 963         /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
 964 }
 965
 966
 967
 968 static irqreturn_t vmbus_isr(int irq, void *dev_id)
 969 {
 970         int ret;
 971
 972         ret = vmbus_on_isr();
 973
 974         /* Schedules a dpc if necessary */
 975         if (ret > 0) {
 976                 if (test_bit(0, (unsigned long *)&ret))
 977                         tasklet_schedule(&vmbus_drv.msg_dpc);
 978
 979                 if (test_bit(1, (unsigned long *)&ret))
 980                         tasklet_schedule(&vmbus_drv.event_dpc);
 981
 982                 return IRQ_HANDLED;
 983         } else {
 984                 return IRQ_NONE;
 985         }
 986 }
 987
 988 static struct dmi_system_id __initdata microsoft_hv_dmi_table[] = {
 989         {
 990                 .ident = "Hyper-V",
 991                 .matches = {
 992                         DMI_MATCH(DMI_SYS_VENDOR, "Microsoft Corporation"),
 993                         DMI_MATCH(DMI_PRODUCT_NAME, "Virtual Machine"),
 994                         DMI_MATCH(DMI_BOARD_NAME, "Virtual Machine"),
 995                 },
 996         },
 997         { },
 998 };
 999 MODULE_DEVICE_TABLE(dmi, microsoft_hv_dmi_table);
1000
1001 static int __init vmbus_init(void)
1002 {
1003         DPRINT_INFO(VMBUS_DRV,
1004                 "Vmbus initializing.... current log level 0x%x (%x,%x)",
1005                 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
1006         /* Todo: it is used for loglevel, to be ported to new kernel. */
1007
1008         if (!dmi_check_system(microsoft_hv_dmi_table))
1009                 return -ENODEV;
1010
1011         return vmbus_bus_init();
1012 }
1013
1014 static void __exit vmbus_exit(void)
1015 {
1016         vmbus_bus_exit();
1017         /* Todo: it is used for loglevel, to be ported to new kernel. */
1018 }
1019
1020 /*
1021  * We use a PCI table to determine if we should autoload this driver  This is
1022  * needed by distro tools to determine if the hyperv drivers should be
1023  * installed and/or configured.  We don't do anything else with the table, but
1024  * it needs to be present.
1025  */
1026 static const struct pci_device_id microsoft_hv_pci_table[] = {
1027         { PCI_DEVICE(0x1414, 0x5353) }, /* VGA compatible controller */
1028         { 0 }
1029 };
1030 MODULE_DEVICE_TABLE(pci, microsoft_hv_pci_table);
1031
1032 MODULE_LICENSE("GPL");
1033 MODULE_VERSION(HV_DRV_VERSION);
1034 module_param(vmbus_irq, int, S_IRUGO);
1035 module_param(vmbus_loglevel, int, S_IRUGO);
1036
1037 module_init(vmbus_init);
1038 module_exit(vmbus_exit);