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