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 "osd.h"
  28 #include "logging.h"
  29 #include "vmbus.h"
  30
  31
  32 /* FIXME! We need to do this dynamically for PIC and APIC system */
  33 #define VMBUS_IRQ               0x5
  34 #define VMBUS_IRQ_VECTOR        IRQ5_VECTOR
  35
  36 /* Main vmbus driver data structure */
  37 struct vmbus_driver_context {
  38         /* !! These must be the first 2 fields !! */
  39         /* FIXME, this is a bug */
  40         /* The driver field is not used in here. Instead, the bus field is */
  41         /* used to represent the driver */
  42         struct driver_context drv_ctx;
  43         struct vmbus_driver drv_obj;
  44
  45         struct bus_type bus;
  46         struct tasklet_struct msg_dpc;
  47         struct tasklet_struct event_dpc;
  48
  49         /* The bus root device */
  50         struct device_context device_ctx;
  51 };
  52
  53 static int vmbus_match(struct device *device, struct device_driver *driver);
  54 static int vmbus_probe(struct device *device);
  55 static int vmbus_remove(struct device *device);
  56 static void vmbus_shutdown(struct device *device);
  57 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
  58 static void vmbus_msg_dpc(unsigned long data);
  59 static void vmbus_event_dpc(unsigned long data);
  60
  61 static irqreturn_t vmbus_isr(int irq, void *dev_id);
  62
  63 static void vmbus_device_release(struct device *device);
  64 static void vmbus_bus_release(struct device *device);
  65
  66 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
  67                                                    struct hv_guid *instance,
  68                                                    void *context);
  69 static void vmbus_child_device_destroy(struct hv_device *device_obj);
  70 static int vmbus_child_device_register(struct hv_device *root_device_obj,
  71                                        struct hv_device *child_device_obj);
  72 static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
  73 static void vmbus_child_device_get_info(struct hv_device *device_obj,
  74                                         struct hv_device_info *device_info);
  75 static ssize_t vmbus_show_device_attr(struct device *dev,
  76                                       struct device_attribute *dev_attr,
  77                                       char *buf);
  78
  79
  80 unsigned int vmbus_loglevel = (ALL_MODULES << 16 | INFO_LVL);
  81 EXPORT_SYMBOL(vmbus_loglevel);
  82         /* (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
  83         /* (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
  84
  85 static int vmbus_irq = VMBUS_IRQ;
  86
  87 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
  88 static struct device_attribute vmbus_device_attrs[] = {
  89         __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
  90         __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
  91         __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
  92         __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
  93         __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
  94
  95         __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
  96         __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
  97         __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
  98
  99         __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
 100         __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
 101         __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
 102
 103         __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
 104         __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
 105         __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
 106         __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 107         __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 108
 109         __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
 110         __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
 111         __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
 112         __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 113         __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 114         __ATTR_NULL
 115 };
 116
 117 /* The one and only one */
 118 static struct vmbus_driver_context g_vmbus_drv = {
 119         .bus.name =             "vmbus",
 120         .bus.match =            vmbus_match,
 121         .bus.shutdown =         vmbus_shutdown,
 122         .bus.remove =           vmbus_remove,
 123         .bus.probe =            vmbus_probe,
 124         .bus.uevent =           vmbus_uevent,
 125         .bus.dev_attrs =        vmbus_device_attrs,
 126 };
 127
 128 /**
 129  * vmbus_show_device_attr - Show the device attribute in sysfs.
 130  *
 131  * This is invoked when user does a
 132  * "cat /sys/bus/vmbus/devices/<busdevice>/<attr name>"
 133  */
 134 static ssize_t vmbus_show_device_attr(struct device *dev,
 135                                       struct device_attribute *dev_attr,
 136                                       char *buf)
 137 {
 138         struct device_context *device_ctx = device_to_device_context(dev);
 139         struct hv_device_info device_info;
 140
 141         memset(&device_info, 0, sizeof(struct hv_device_info));
 142
 143         vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
 144
 145         if (!strcmp(dev_attr->attr.name, "class_id")) {
 146                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 147                                "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 148                                device_info.ChannelType.data[3],
 149                                device_info.ChannelType.data[2],
 150                                device_info.ChannelType.data[1],
 151                                device_info.ChannelType.data[0],
 152                                device_info.ChannelType.data[5],
 153                                device_info.ChannelType.data[4],
 154                                device_info.ChannelType.data[7],
 155                                device_info.ChannelType.data[6],
 156                                device_info.ChannelType.data[8],
 157                                device_info.ChannelType.data[9],
 158                                device_info.ChannelType.data[10],
 159                                device_info.ChannelType.data[11],
 160                                device_info.ChannelType.data[12],
 161                                device_info.ChannelType.data[13],
 162                                device_info.ChannelType.data[14],
 163                                device_info.ChannelType.data[15]);
 164         } else if (!strcmp(dev_attr->attr.name, "device_id")) {
 165                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 166                                "%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 167                                device_info.ChannelInstance.data[3],
 168                                device_info.ChannelInstance.data[2],
 169                                device_info.ChannelInstance.data[1],
 170                                device_info.ChannelInstance.data[0],
 171                                device_info.ChannelInstance.data[5],
 172                                device_info.ChannelInstance.data[4],
 173                                device_info.ChannelInstance.data[7],
 174                                device_info.ChannelInstance.data[6],
 175                                device_info.ChannelInstance.data[8],
 176                                device_info.ChannelInstance.data[9],
 177                                device_info.ChannelInstance.data[10],
 178                                device_info.ChannelInstance.data[11],
 179                                device_info.ChannelInstance.data[12],
 180                                device_info.ChannelInstance.data[13],
 181                                device_info.ChannelInstance.data[14],
 182                                device_info.ChannelInstance.data[15]);
 183         } else if (!strcmp(dev_attr->attr.name, "state")) {
 184                 return sprintf(buf, "%d\n", device_info.ChannelState);
 185         } else if (!strcmp(dev_attr->attr.name, "id")) {
 186                 return sprintf(buf, "%d\n", device_info.ChannelId);
 187         } else if (!strcmp(dev_attr->attr.name, "out_intr_mask")) {
 188                 return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
 189         } else if (!strcmp(dev_attr->attr.name, "out_read_index")) {
 190                 return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
 191         } else if (!strcmp(dev_attr->attr.name, "out_write_index")) {
 192                 return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
 193         } else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail")) {
 194                 return sprintf(buf, "%d\n",
 195                                device_info.Outbound.BytesAvailToRead);
 196         } else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail")) {
 197                 return sprintf(buf, "%d\n",
 198                                device_info.Outbound.BytesAvailToWrite);
 199         } else if (!strcmp(dev_attr->attr.name, "in_intr_mask")) {
 200                 return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
 201         } else if (!strcmp(dev_attr->attr.name, "in_read_index")) {
 202                 return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
 203         } else if (!strcmp(dev_attr->attr.name, "in_write_index")) {
 204                 return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
 205         } else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail")) {
 206                 return sprintf(buf, "%d\n",
 207                                device_info.Inbound.BytesAvailToRead);
 208         } else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail")) {
 209                 return sprintf(buf, "%d\n",
 210                                device_info.Inbound.BytesAvailToWrite);
 211         } else if (!strcmp(dev_attr->attr.name, "monitor_id")) {
 212                 return sprintf(buf, "%d\n", device_info.MonitorId);
 213         } else if (!strcmp(dev_attr->attr.name, "server_monitor_pending")) {
 214                 return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
 215         } else if (!strcmp(dev_attr->attr.name, "server_monitor_latency")) {
 216                 return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
 217         } else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id")) {
 218                 return sprintf(buf, "%d\n",
 219                                device_info.ServerMonitorConnectionId);
 220         } else if (!strcmp(dev_attr->attr.name, "client_monitor_pending")) {
 221                 return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
 222         } else if (!strcmp(dev_attr->attr.name, "client_monitor_latency")) {
 223                 return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
 224         } else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id")) {
 225                 return sprintf(buf, "%d\n",
 226                                device_info.ClientMonitorConnectionId);
 227         } else {
 228                 return 0;
 229         }
 230 }
 231
 232 /**
 233  * vmbus_bus_init -Main vmbus driver initialization routine.
 234  *
 235  * Here, we
 236  *      - initialize the vmbus driver context
 237  *      - setup various driver entry points
 238  *      - invoke the vmbus hv main init routine
 239  *      - get the irq resource
 240  *      - invoke the vmbus to add the vmbus root device
 241  *      - setup the vmbus root device
 242  *      - retrieve the channel offers
 243  */
 244 static int vmbus_bus_init(int (*drv_init)(struct hv_driver *drv))
 245 {
 246         struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
 247         struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 248         struct device_context *dev_ctx = &g_vmbus_drv.device_ctx;
 249         int ret;
 250         unsigned int vector;
 251
 252         DPRINT_ENTER(VMBUS_DRV);
 253
 254         /*
 255          * Set this up to allow lower layer to callback to add/remove child
 256          * devices on the bus
 257          */
 258         vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
 259         vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
 260         vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
 261         vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
 262
 263         /* Call to bus driver to initialize */
 264         ret = drv_init(&vmbus_drv_obj->Base);
 265         if (ret != 0) {
 266                 DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
 267                 goto cleanup;
 268         }
 269
 270         /* Sanity checks */
 271         if (!vmbus_drv_obj->Base.OnDeviceAdd) {
 272                 DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
 273                 ret = -1;
 274                 goto cleanup;
 275         }
 276
 277         vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
 278
 279         /* Initialize the bus context */
 280         tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc,
 281                      (unsigned long)vmbus_drv_obj);
 282         tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc,
 283                      (unsigned long)vmbus_drv_obj);
 284
 285         /* Now, register the bus driver with LDM */
 286         ret = bus_register(&vmbus_drv_ctx->bus);
 287         if (ret) {
 288                 ret = -1;
 289                 goto cleanup;
 290         }
 291
 292         /* Get the interrupt resource */
 293         ret = request_irq(vmbus_irq, vmbus_isr, IRQF_SAMPLE_RANDOM,
 294                           vmbus_drv_obj->Base.name, NULL);
 295
 296         if (ret != 0) {
 297                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d",
 298                            vmbus_irq);
 299
 300                 bus_unregister(&vmbus_drv_ctx->bus);
 301
 302                 ret = -1;
 303                 goto cleanup;
 304         }
 305         vector = VMBUS_IRQ_VECTOR;
 306
 307         DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
 308
 309         /* Call to bus driver to add the root device */
 310         memset(dev_ctx, 0, sizeof(struct device_context));
 311
 312         ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
 313         if (ret != 0) {
 314                 DPRINT_ERR(VMBUS_DRV,
 315                            "ERROR - Unable to add vmbus root device");
 316
 317                 free_irq(vmbus_irq, NULL);
 318
 319                 bus_unregister(&vmbus_drv_ctx->bus);
 320
 321                 ret = -1;
 322                 goto cleanup;
 323         }
 324         /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
 325         dev_set_name(&dev_ctx->device, "vmbus_0_0");
 326         memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType,
 327                 sizeof(struct hv_guid));
 328         memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance,
 329                 sizeof(struct hv_guid));
 330
 331         /* No need to bind a driver to the root device. */
 332         dev_ctx->device.parent = NULL;
 333         /* NULL; vmbus_remove() does not get invoked */
 334         dev_ctx->device.bus = &vmbus_drv_ctx->bus;
 335
 336         /* Setup the device dispatch table */
 337         dev_ctx->device.release = vmbus_bus_release;
 338
 339         /* Setup the bus as root device */
 340         ret = device_register(&dev_ctx->device);
 341         if (ret) {
 342                 DPRINT_ERR(VMBUS_DRV,
 343                            "ERROR - Unable to register vmbus root device");
 344
 345                 free_irq(vmbus_irq, NULL);
 346                 bus_unregister(&vmbus_drv_ctx->bus);
 347
 348                 ret = -1;
 349                 goto cleanup;
 350         }
 351
 352
 353         vmbus_drv_obj->GetChannelOffers();
 354
 355 cleanup:
 356         DPRINT_EXIT(VMBUS_DRV);
 357
 358         return ret;
 359 }
 360
 361 /**
 362  * vmbus_bus_exit - Terminate the vmbus driver.
 363  *
 364  * This routine is opposite of vmbus_bus_init()
 365  */
 366 static void vmbus_bus_exit(void)
 367 {
 368         struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 369         struct vmbus_driver_context *vmbus_drv_ctx = &g_vmbus_drv;
 370
 371         struct device_context *dev_ctx = &g_vmbus_drv.device_ctx;
 372
 373         DPRINT_ENTER(VMBUS_DRV);
 374
 375         /* Remove the root device */
 376         if (vmbus_drv_obj->Base.OnDeviceRemove)
 377                 vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
 378
 379         if (vmbus_drv_obj->Base.OnCleanup)
 380                 vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
 381
 382         /* Unregister the root bus device */
 383         device_unregister(&dev_ctx->device);
 384
 385         bus_unregister(&vmbus_drv_ctx->bus);
 386
 387         free_irq(vmbus_irq, NULL);
 388
 389         tasklet_kill(&vmbus_drv_ctx->msg_dpc);
 390         tasklet_kill(&vmbus_drv_ctx->event_dpc);
 391
 392         DPRINT_EXIT(VMBUS_DRV);
 393
 394         return;
 395 }
 396
 397 /**
 398  * vmbus_child_driver_register - Register a vmbus's child driver
 399  */
 400 int vmbus_child_driver_register(struct driver_context *driver_ctx)
 401 {
 402         struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 403         int ret;
 404
 405         DPRINT_ENTER(VMBUS_DRV);
 406
 407         DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s",
 408                     driver_ctx, driver_ctx->driver.name);
 409
 410         /* The child driver on this vmbus */
 411         driver_ctx->driver.bus = &g_vmbus_drv.bus;
 412
 413         ret = driver_register(&driver_ctx->driver);
 414
 415         vmbus_drv_obj->GetChannelOffers();
 416
 417         DPRINT_EXIT(VMBUS_DRV);
 418
 419         return ret;
 420 }
 421 EXPORT_SYMBOL(vmbus_child_driver_register);
 422
 423 /**
 424  * vmbus_child_driver_unregister Unregister a vmbus's child driver
 425  */
 426 void vmbus_child_driver_unregister(struct driver_context *driver_ctx)
 427 {
 428         DPRINT_ENTER(VMBUS_DRV);
 429
 430         DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s",
 431                     driver_ctx, driver_ctx->driver.name);
 432
 433         driver_unregister(&driver_ctx->driver);
 434
 435         driver_ctx->driver.bus = NULL;
 436
 437         DPRINT_EXIT(VMBUS_DRV);
 438 }
 439 EXPORT_SYMBOL(vmbus_child_driver_unregister);
 440
 441 /**
 442  * vmbus_get_interface - Get the vmbus channel interface.
 443  *
 444  * This is invoked by child/client driver that sits above vmbus
 445  */
 446 void vmbus_get_interface(struct vmbus_channel_interface *interface)
 447 {
 448         struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 449
 450         vmbus_drv_obj->GetChannelInterface(interface);
 451 }
 452 EXPORT_SYMBOL(vmbus_get_interface);
 453
 454 /**
 455  * vmbus_child_device_get_info - Get the vmbus child device info.
 456  *
 457  * This is invoked to display various device attributes in sysfs.
 458  */
 459 static void vmbus_child_device_get_info(struct hv_device *device_obj,
 460                                         struct hv_device_info *device_info)
 461 {
 462         struct vmbus_driver *vmbus_drv_obj = &g_vmbus_drv.drv_obj;
 463
 464         vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
 465 }
 466
 467 /**
 468  * vmbus_child_device_create - Creates and registers a new child device on the vmbus.
 469  */
 470 static struct hv_device *vmbus_child_device_create(struct hv_guid *type,
 471                                                    struct hv_guid *instance,
 472                                                    void *context)
 473 {
 474         struct device_context *child_device_ctx;
 475         struct hv_device *child_device_obj;
 476
 477         DPRINT_ENTER(VMBUS_DRV);
 478
 479         /* Allocate the new child device */
 480         child_device_ctx = kzalloc(sizeof(struct device_context), GFP_KERNEL);
 481         if (!child_device_ctx) {
 482                 DPRINT_ERR(VMBUS_DRV,
 483                         "unable to allocate device_context for child device");
 484                 DPRINT_EXIT(VMBUS_DRV);
 485
 486                 return NULL;
 487         }
 488
 489         DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
 490                 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 491                 "%02x%02x%02x%02x%02x%02x%02x%02x},"
 492                 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 493                 "%02x%02x%02x%02x%02x%02x%02x%02x}",
 494                 &child_device_ctx->device,
 495                 type->data[3], type->data[2], type->data[1], type->data[0],
 496                 type->data[5], type->data[4], type->data[7], type->data[6],
 497                 type->data[8], type->data[9], type->data[10], type->data[11],
 498                 type->data[12], type->data[13], type->data[14], type->data[15],
 499                 instance->data[3], instance->data[2],
 500                 instance->data[1], instance->data[0],
 501                 instance->data[5], instance->data[4],
 502                 instance->data[7], instance->data[6],
 503                 instance->data[8], instance->data[9],
 504                 instance->data[10], instance->data[11],
 505                 instance->data[12], instance->data[13],
 506                 instance->data[14], instance->data[15]);
 507
 508         child_device_obj = &child_device_ctx->device_obj;
 509         child_device_obj->context = context;
 510         memcpy(&child_device_obj->deviceType, &type, sizeof(struct hv_guid));
 511         memcpy(&child_device_obj->deviceInstance, &instance,
 512                sizeof(struct hv_guid));
 513
 514         memcpy(&child_device_ctx->class_id, &type, sizeof(struct hv_guid));
 515         memcpy(&child_device_ctx->device_id, &instance, sizeof(struct hv_guid));
 516
 517         DPRINT_EXIT(VMBUS_DRV);
 518
 519         return child_device_obj;
 520 }
 521
 522 /**
 523  * vmbus_child_device_register - Register the child device on the specified bus
 524  */
 525 static int vmbus_child_device_register(struct hv_device *root_device_obj,
 526                                        struct hv_device *child_device_obj)
 527 {
 528         int ret = 0;
 529         struct device_context *root_device_ctx =
 530                                 to_device_context(root_device_obj);
 531         struct device_context *child_device_ctx =
 532                                 to_device_context(child_device_obj);
 533         static atomic_t device_num = ATOMIC_INIT(0);
 534
 535         DPRINT_ENTER(VMBUS_DRV);
 536
 537         DPRINT_DBG(VMBUS_DRV, "child device (%p) registering",
 538                    child_device_ctx);
 539
 540         /* Make sure we are not registered already */
 541         if (strlen(dev_name(&child_device_ctx->device)) != 0) {
 542                 DPRINT_ERR(VMBUS_DRV,
 543                            "child device (%p) already registered - busid %s",
 544                            child_device_ctx,
 545                            dev_name(&child_device_ctx->device));
 546
 547                 ret = -1;
 548                 goto Cleanup;
 549         }
 550
 551         /* Set the device bus id. Otherwise, device_register()will fail. */
 552         dev_set_name(&child_device_ctx->device, "vmbus_0_%d",
 553                      atomic_inc_return(&device_num));
 554
 555         /* The new device belongs to this bus */
 556         child_device_ctx->device.bus = &g_vmbus_drv.bus; /* device->dev.bus; */
 557         child_device_ctx->device.parent = &root_device_ctx->device;
 558         child_device_ctx->device.release = vmbus_device_release;
 559
 560         /*
 561          * Register with the LDM. This will kick off the driver/device
 562          * binding...which will eventually call vmbus_match() and vmbus_probe()
 563          */
 564         ret = device_register(&child_device_ctx->device);
 565
 566         /* vmbus_probe() error does not get propergate to device_register(). */
 567         ret = child_device_ctx->probe_error;
 568
 569         if (ret)
 570                 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)",
 571                            &child_device_ctx->device);
 572         else
 573                 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered",
 574                             &child_device_ctx->device);
 575
 576 Cleanup:
 577         DPRINT_EXIT(VMBUS_DRV);
 578
 579         return ret;
 580 }
 581
 582 /**
 583  * vmbus_child_device_unregister - Remove the specified child device from the vmbus.
 584  */
 585 static void vmbus_child_device_unregister(struct hv_device *device_obj)
 586 {
 587         struct device_context *device_ctx = to_device_context(device_obj);
 588
 589         DPRINT_ENTER(VMBUS_DRV);
 590
 591         DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)",
 592                     &device_ctx->device);
 593
 594         /*
 595          * Kick off the process of unregistering the device.
 596          * This will call vmbus_remove() and eventually vmbus_device_release()
 597          */
 598         device_unregister(&device_ctx->device);
 599
 600         DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered",
 601                     &device_ctx->device);
 602
 603         DPRINT_EXIT(VMBUS_DRV);
 604 }
 605
 606 /**
 607  * vmbus_child_device_destroy - Destroy the specified child device on the vmbus.
 608  */
 609 static void vmbus_child_device_destroy(struct hv_device *device_obj)
 610 {
 611         DPRINT_ENTER(VMBUS_DRV);
 612
 613         DPRINT_EXIT(VMBUS_DRV);
 614 }
 615
 616 /**
 617  * vmbus_uevent - add uevent for our device
 618  *
 619  * This routine is invoked when a device is added or removed on the vmbus to
 620  * generate a uevent to udev in the userspace. The udev will then look at its
 621  * rule and the uevent generated here to load the appropriate driver
 622  */
 623 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
 624 {
 625         struct device_context *device_ctx = device_to_device_context(device);
 626         int i = 0;
 627         int len = 0;
 628         int ret;
 629
 630         DPRINT_ENTER(VMBUS_DRV);
 631
 632         DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={"
 633                     "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 634                     "%02x%02x%02x%02x%02x%02x%02x%02x}",
 635                     device_ctx->class_id.data[3], device_ctx->class_id.data[2],
 636                     device_ctx->class_id.data[1], device_ctx->class_id.data[0],
 637                     device_ctx->class_id.data[5], device_ctx->class_id.data[4],
 638                     device_ctx->class_id.data[7], device_ctx->class_id.data[6],
 639                     device_ctx->class_id.data[8], device_ctx->class_id.data[9],
 640                     device_ctx->class_id.data[10],
 641                     device_ctx->class_id.data[11],
 642                     device_ctx->class_id.data[12],
 643                     device_ctx->class_id.data[13],
 644                     device_ctx->class_id.data[14],
 645                     device_ctx->class_id.data[15]);
 646
 647         env->envp_idx = i;
 648         env->buflen = len;
 649         ret = add_uevent_var(env, "VMBUS_DEVICE_CLASS_GUID={"
 650                              "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 651                              "%02x%02x%02x%02x%02x%02x%02x%02x}",
 652                              device_ctx->class_id.data[3],
 653                              device_ctx->class_id.data[2],
 654                              device_ctx->class_id.data[1],
 655                              device_ctx->class_id.data[0],
 656                              device_ctx->class_id.data[5],
 657                              device_ctx->class_id.data[4],
 658                              device_ctx->class_id.data[7],
 659                              device_ctx->class_id.data[6],
 660                              device_ctx->class_id.data[8],
 661                              device_ctx->class_id.data[9],
 662                              device_ctx->class_id.data[10],
 663                              device_ctx->class_id.data[11],
 664                              device_ctx->class_id.data[12],
 665                              device_ctx->class_id.data[13],
 666                              device_ctx->class_id.data[14],
 667                              device_ctx->class_id.data[15]);
 668
 669         if (ret)
 670                 return ret;
 671
 672         ret = add_uevent_var(env, "VMBUS_DEVICE_DEVICE_GUID={"
 673                              "%02x%02x%02x%02x-%02x%02x-%02x%02x-"
 674                              "%02x%02x%02x%02x%02x%02x%02x%02x}",
 675                              device_ctx->device_id.data[3],
 676                              device_ctx->device_id.data[2],
 677                              device_ctx->device_id.data[1],
 678                              device_ctx->device_id.data[0],
 679                              device_ctx->device_id.data[5],
 680                              device_ctx->device_id.data[4],
 681                              device_ctx->device_id.data[7],
 682                              device_ctx->device_id.data[6],
 683                              device_ctx->device_id.data[8],
 684                              device_ctx->device_id.data[9],
 685                              device_ctx->device_id.data[10],
 686                              device_ctx->device_id.data[11],
 687                              device_ctx->device_id.data[12],
 688                              device_ctx->device_id.data[13],
 689                              device_ctx->device_id.data[14],
 690                              device_ctx->device_id.data[15]);
 691         if (ret)
 692                 return ret;
 693
 694         env->envp[env->envp_idx] = NULL;
 695
 696         DPRINT_EXIT(VMBUS_DRV);
 697
 698         return 0;
 699 }
 700
 701 /**
 702  * vmbus_match - Attempt to match the specified device to the specified driver
 703  */
 704 static int vmbus_match(struct device *device, struct device_driver *driver)
 705 {
 706         int match = 0;
 707         struct driver_context *driver_ctx = driver_to_driver_context(driver);
 708         struct device_context *device_ctx = device_to_device_context(device);
 709
 710         DPRINT_ENTER(VMBUS_DRV);
 711
 712         /* We found our driver ? */
 713         if (memcmp(&device_ctx->class_id, &driver_ctx->class_id,
 714                    sizeof(struct hv_guid)) == 0) {
 715                 /*
 716                  * !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast
 717                  * it here to access the struct hv_driver field
 718                  */
 719                 struct vmbus_driver_context *vmbus_drv_ctx =
 720                         (struct vmbus_driver_context *)driver_ctx;
 721
 722                 device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
 723                 DPRINT_INFO(VMBUS_DRV,
 724                             "device object (%p) set to driver object (%p)",
 725                             &device_ctx->device_obj,
 726                             device_ctx->device_obj.Driver);
 727
 728                 match = 1;
 729         }
 730
 731         DPRINT_EXIT(VMBUS_DRV);
 732
 733         return match;
 734 }
 735
 736 /**
 737  * vmbus_probe_failed_cb - Callback when a driver probe failed in vmbus_probe()
 738  *
 739  * We need a callback because we cannot invoked device_unregister() inside
 740  * vmbus_probe() since vmbus_probe() may be invoked inside device_register()
 741  * i.e. we cannot call device_unregister() inside device_register()
 742  */
 743 static void vmbus_probe_failed_cb(struct work_struct *context)
 744 {
 745         struct device_context *device_ctx = (struct device_context *)context;
 746
 747         DPRINT_ENTER(VMBUS_DRV);
 748
 749         /*
 750          * Kick off the process of unregistering the device.
 751          * This will call vmbus_remove() and eventually vmbus_device_release()
 752          */
 753         device_unregister(&device_ctx->device);
 754
 755         /* put_device(&device_ctx->device); */
 756         DPRINT_EXIT(VMBUS_DRV);
 757 }
 758
 759 /**
 760  * vmbus_probe - Add the new vmbus's child device
 761  */
 762 static int vmbus_probe(struct device *child_device)
 763 {
 764         int ret = 0;
 765         struct driver_context *driver_ctx =
 766                         driver_to_driver_context(child_device->driver);
 767         struct device_context *device_ctx =
 768                         device_to_device_context(child_device);
 769
 770         DPRINT_ENTER(VMBUS_DRV);
 771
 772         /* Let the specific open-source driver handles the probe if it can */
 773         if (driver_ctx->probe) {
 774                 ret = device_ctx->probe_error = driver_ctx->probe(child_device);
 775                 if (ret != 0) {
 776                         DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s "
 777                                    "(%p) on driver %s (%d)...",
 778                                    dev_name(child_device), child_device,
 779                                    child_device->driver->name, ret);
 780
 781                         INIT_WORK(&device_ctx->probe_failed_work_item,
 782                                   vmbus_probe_failed_cb);
 783                         schedule_work(&device_ctx->probe_failed_work_item);
 784                 }
 785         } else {
 786                 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s",
 787                            child_device->driver->name);
 788                 ret = -1;
 789         }
 790
 791         DPRINT_EXIT(VMBUS_DRV);
 792         return ret;
 793 }
 794
 795 /**
 796  * vmbus_remove - Remove a vmbus device
 797  */
 798 static int vmbus_remove(struct device *child_device)
 799 {
 800         int ret;
 801         struct driver_context *driver_ctx;
 802
 803         DPRINT_ENTER(VMBUS_DRV);
 804
 805         /* Special case root bus device */
 806         if (child_device->parent == NULL) {
 807                 /*
 808                  * No-op since it is statically defined and handle in
 809                  * vmbus_bus_exit()
 810                  */
 811                 DPRINT_EXIT(VMBUS_DRV);
 812                 return 0;
 813         }
 814
 815         if (child_device->driver) {
 816                 driver_ctx = driver_to_driver_context(child_device->driver);
 817
 818                 /*
 819                  * Let the specific open-source driver handles the removal if
 820                  * it can
 821                  */
 822                 if (driver_ctx->remove) {
 823                         ret = driver_ctx->remove(child_device);
 824                 } else {
 825                         DPRINT_ERR(VMBUS_DRV,
 826                                    "remove() method not set for driver - %s",
 827                                    child_device->driver->name);
 828                         ret = -1;
 829                 }
 830         }
 831
 832         DPRINT_EXIT(VMBUS_DRV);
 833
 834         return 0;
 835 }
 836
 837 /**
 838  * vmbus_shutdown - Shutdown a vmbus device
 839  */
 840 static void vmbus_shutdown(struct device *child_device)
 841 {
 842         struct driver_context *driver_ctx;
 843
 844         DPRINT_ENTER(VMBUS_DRV);
 845
 846         /* Special case root bus device */
 847         if (child_device->parent == NULL) {
 848                 /*
 849                  * No-op since it is statically defined and handle in
 850                  * vmbus_bus_exit()
 851                  */
 852                 DPRINT_EXIT(VMBUS_DRV);
 853                 return;
 854         }
 855
 856         /* The device may not be attached yet */
 857         if (!child_device->driver) {
 858                 DPRINT_EXIT(VMBUS_DRV);
 859                 return;
 860         }
 861
 862         driver_ctx = driver_to_driver_context(child_device->driver);
 863
 864         /* Let the specific open-source driver handles the removal if it can */
 865         if (driver_ctx->shutdown)
 866                 driver_ctx->shutdown(child_device);
 867
 868         DPRINT_EXIT(VMBUS_DRV);
 869
 870         return;
 871 }
 872
 873 /**
 874  * vmbus_bus_release - Final callback release of the vmbus root device
 875  */
 876 static void vmbus_bus_release(struct device *device)
 877 {
 878         DPRINT_ENTER(VMBUS_DRV);
 879         /* FIXME */
 880         /* Empty release functions are a bug, or a major sign
 881          * of a problem design, this MUST BE FIXED! */
 882         dev_err(device, "%s needs to be fixed!\n", __func__);
 883         WARN_ON(1);
 884         DPRINT_EXIT(VMBUS_DRV);
 885 }
 886
 887 /**
 888  * vmbus_device_release - Final callback release of the vmbus child device
 889  */
 890 static void vmbus_device_release(struct device *device)
 891 {
 892         struct device_context *device_ctx = device_to_device_context(device);
 893
 894         DPRINT_ENTER(VMBUS_DRV);
 895
 896         /* vmbus_child_device_destroy(&device_ctx->device_obj); */
 897         kfree(device_ctx);
 898
 899         /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
 900         DPRINT_EXIT(VMBUS_DRV);
 901
 902         return;
 903 }
 904
 905 /**
 906  * vmbus_msg_dpc - Tasklet routine to handle hypervisor messages
 907  */
 908 static void vmbus_msg_dpc(unsigned long data)
 909 {
 910         struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
 911
 912         DPRINT_ENTER(VMBUS_DRV);
 913
 914         ASSERT(vmbus_drv_obj->OnMsgDpc != NULL);
 915
 916         /* Call to bus driver to handle interrupt */
 917         vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
 918
 919         DPRINT_EXIT(VMBUS_DRV);
 920 }
 921
 922 /**
 923  * vmbus_msg_dpc - Tasklet routine to handle hypervisor events
 924  */
 925 static void vmbus_event_dpc(unsigned long data)
 926 {
 927         struct vmbus_driver *vmbus_drv_obj = (struct vmbus_driver *)data;
 928
 929         DPRINT_ENTER(VMBUS_DRV);
 930
 931         ASSERT(vmbus_drv_obj->OnEventDpc != NULL);
 932
 933         /* Call to bus driver to handle interrupt */
 934         vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
 935
 936         DPRINT_EXIT(VMBUS_DRV);
 937 }
 938
 939 static irqreturn_t vmbus_isr(int irq, void *dev_id)
 940 {
 941         struct vmbus_driver *vmbus_driver_obj = &g_vmbus_drv.drv_obj;
 942         int ret;
 943
 944         DPRINT_ENTER(VMBUS_DRV);
 945
 946         ASSERT(vmbus_driver_obj->OnIsr != NULL);
 947
 948         /* Call to bus driver to handle interrupt */
 949         ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
 950
 951         /* Schedules a dpc if necessary */
 952         if (ret > 0) {
 953                 if (test_bit(0, (unsigned long *)&ret))
 954                         tasklet_schedule(&g_vmbus_drv.msg_dpc);
 955
 956                 if (test_bit(1, (unsigned long *)&ret))
 957                         tasklet_schedule(&g_vmbus_drv.event_dpc);
 958
 959                 DPRINT_EXIT(VMBUS_DRV);
 960                 return IRQ_HANDLED;
 961         } else {
 962                 DPRINT_EXIT(VMBUS_DRV);
 963                 return IRQ_NONE;
 964         }
 965 }
 966
 967 static int __init vmbus_init(void)
 968 {
 969         int ret = 0;
 970
 971         DPRINT_ENTER(VMBUS_DRV);
 972
 973         DPRINT_INFO(VMBUS_DRV,
 974                 "Vmbus initializing.... current log level 0x%x (%x,%x)",
 975                 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
 976         /* Todo: it is used for loglevel, to be ported to new kernel. */
 977
 978         ret = vmbus_bus_init(VmbusInitialize);
 979
 980         DPRINT_EXIT(VMBUS_DRV);
 981         return ret;
 982 }
 983
 984 static void __exit vmbus_exit(void)
 985 {
 986         DPRINT_ENTER(VMBUS_DRV);
 987
 988         vmbus_bus_exit();
 989         /* Todo: it is used for loglevel, to be ported to new kernel. */
 990         DPRINT_EXIT(VMBUS_DRV);
 991         return;
 992 }
 993
 994 MODULE_LICENSE("GPL");
 995 module_param(vmbus_irq, int, S_IRUGO);
 996 module_param(vmbus_loglevel, int, S_IRUGO);
 997
 998 module_init(vmbus_init);
 999 module_exit(vmbus_exit);