drivers/staging/hv/vmbus_drv.c

   1 /*
   2  *
   3  * Copyright (c) 2009, Microsoft Corporation.
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms and conditions of the GNU General Public License,
   7  * version 2, as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
  16  * Place - Suite 330, Boston, MA 02111-1307 USA.
  17  *
  18  * Authors:
  19  *   Haiyang Zhang <haiyangz@microsoft.com>
  20  *   Hank Janssen  <hjanssen@microsoft.com>
  21  *
  22  */
  23
  24
  25 #include <linux/init.h>
  26 #include <linux/module.h>
  27 #include <linux/device.h>
  28 #include <linux/irq.h>
  29 #include <linux/interrupt.h>
  30 #include <linux/sysctl.h>
  31
  32 #include "include/logging.h"
  33 #include "include/vmbus.h"
  34
  35
  36 /* Defines */
  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 /* Data types */
  44
  45
  46 /* Main vmbus driver data structure */
  47 struct vmbus_driver_context {
  48         /* !! These must be the first 2 fields !! */
  49         /* The driver field is not used in here. Instead, the bus field is */
  50         /* used to represent the driver */
  51         struct driver_context   drv_ctx;
  52         VMBUS_DRIVER_OBJECT             drv_obj;
  53
  54         struct bus_type                 bus;
  55         struct tasklet_struct   msg_dpc;
  56         struct tasklet_struct   event_dpc;
  57
  58         /* The bus root device */
  59         struct device_context   device_ctx;
  60 };
  61
  62
  63 /* Static decl */
  64
  65 static int vmbus_match(struct device *device, struct device_driver *driver);
  66 static int vmbus_probe(struct device *device);
  67 static int vmbus_remove(struct device *device);
  68 static void vmbus_shutdown(struct device *device);
  69 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env);
  70 static void vmbus_msg_dpc(unsigned long data);
  71 static void vmbus_event_dpc(unsigned long data);
  72
  73 static irqreturn_t vmbus_isr(int irq, void* dev_id);
  74
  75 static void vmbus_device_release(struct device *device);
  76 static void vmbus_bus_release(struct device *device);
  77
  78 static struct hv_device *vmbus_child_device_create(GUID type, GUID instance, void* context);
  79 static void vmbus_child_device_destroy(struct hv_device *device_obj);
  80 static int vmbus_child_device_register(struct hv_device *root_device_obj, struct hv_device *child_device_obj);
  81 static void vmbus_child_device_unregister(struct hv_device *child_device_obj);
  82 static void vmbus_child_device_get_info(struct hv_device *device_obj, DEVICE_INFO *device_info);
  83
  84 /* static ssize_t vmbus_show_class_id(struct device *dev, struct device_attribute *attr, char *buf); */
  85 /* static ssize_t vmbus_show_device_id(struct device *dev, struct device_attribute *attr, char *buf); */
  86
  87 static ssize_t vmbus_show_device_attr(struct device *dev, struct device_attribute *dev_attr, char *buf);
  88
  89
  90 /* Global */
  91
  92
  93 /* Global logging setting */
  94
  95 /* unsigned int vmbus_loglevel= (((VMBUS | VMBUS_DRV)<<16) | DEBUG_LVL_ENTEREXIT); */
  96 /* unsigned int vmbus_loglevel= (ALL_MODULES << 16 | DEBUG_LVL_ENTEREXIT); */
  97 unsigned int vmbus_loglevel= (ALL_MODULES << 16 | INFO_LVL);
  98 EXPORT_SYMBOL(vmbus_loglevel);
  99
 100 static int vmbus_irq = VMBUS_IRQ;
 101
 102 /* Setup /proc/sys/bus/vmbus/vmbus_loglevel */
 103 /* Allow usage of sysctl cmd to set the logging level */
 104
 105 /* Set up per device attributes in /sys/bus/vmbus/devices/<bus device> */
 106
 107 static struct device_attribute vmbus_device_attrs[] = {
 108         __ATTR(id, S_IRUGO, vmbus_show_device_attr, NULL),
 109         __ATTR(state, S_IRUGO, vmbus_show_device_attr, NULL),
 110         __ATTR(class_id, S_IRUGO, vmbus_show_device_attr, NULL),
 111         __ATTR(device_id, S_IRUGO, vmbus_show_device_attr, NULL),
 112         __ATTR(monitor_id, S_IRUGO, vmbus_show_device_attr, NULL),
 113
 114         __ATTR(server_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
 115         __ATTR(server_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
 116         __ATTR(server_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
 117
 118         __ATTR(client_monitor_pending, S_IRUGO, vmbus_show_device_attr, NULL),
 119         __ATTR(client_monitor_latency, S_IRUGO, vmbus_show_device_attr, NULL),
 120         __ATTR(client_monitor_conn_id, S_IRUGO, vmbus_show_device_attr, NULL),
 121
 122         __ATTR(out_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
 123         __ATTR(out_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
 124         __ATTR(out_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
 125         __ATTR(out_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 126         __ATTR(out_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 127
 128         __ATTR(in_intr_mask, S_IRUGO, vmbus_show_device_attr, NULL),
 129         __ATTR(in_read_index, S_IRUGO, vmbus_show_device_attr, NULL),
 130         __ATTR(in_write_index, S_IRUGO, vmbus_show_device_attr, NULL),
 131         __ATTR(in_read_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 132         __ATTR(in_write_bytes_avail, S_IRUGO, vmbus_show_device_attr, NULL),
 133         __ATTR_NULL
 134 };
 135
 136 /* The one and only one */
 137 static struct vmbus_driver_context g_vmbus_drv={
 138         .bus.name       = "vmbus",
 139         .bus.match      = vmbus_match,
 140         .bus.shutdown = vmbus_shutdown,
 141         .bus.remove = vmbus_remove,
 142         .bus.probe      = vmbus_probe,
 143         .bus.uevent = vmbus_uevent,
 144         .bus.dev_attrs = vmbus_device_attrs,
 145 };
 146
 147
 148 /* Routines */
 149
 150
 151
 152 /*++
 153
 154 Name:   vmbus_show_device_attr()
 155
 156 Desc:   Show the device attribute in sysfs. This is invoked when user does a "cat /sys/bus/vmbus/devices/<bus device>/<attr name>"
 157
 158 --*/
 159 static ssize_t vmbus_show_device_attr(struct device *dev, struct device_attribute *dev_attr, char *buf)
 160 {
 161         struct device_context *device_ctx = device_to_device_context(dev);
 162         DEVICE_INFO device_info;
 163
 164         memset(&device_info, 0, sizeof(DEVICE_INFO));
 165
 166         vmbus_child_device_get_info(&device_ctx->device_obj, &device_info);
 167
 168         if (!strcmp(dev_attr->attr.name, "class_id"))
 169         {
 170                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 171                         device_info.ChannelType.Data[3], device_info.ChannelType.Data[2], device_info.ChannelType.Data[1], device_info.ChannelType.Data[0],
 172                         device_info.ChannelType.Data[5], device_info.ChannelType.Data[4],
 173                         device_info.ChannelType.Data[7], device_info.ChannelType.Data[6],
 174                         device_info.ChannelType.Data[8], device_info.ChannelType.Data[9], device_info.ChannelType.Data[10], device_info.ChannelType.Data[11], device_info.ChannelType.Data[12], device_info.ChannelType.Data[13], device_info.ChannelType.Data[14], device_info.ChannelType.Data[15]);
 175
 176         }
 177         else if (!strcmp(dev_attr->attr.name, "device_id"))
 178         {
 179                 return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n",
 180                         device_info.ChannelInstance.Data[3], device_info.ChannelInstance.Data[2], device_info.ChannelInstance.Data[1], device_info.ChannelInstance.Data[0],
 181                         device_info.ChannelInstance.Data[5], device_info.ChannelInstance.Data[4],
 182                         device_info.ChannelInstance.Data[7], device_info.ChannelInstance.Data[6],
 183                         device_info.ChannelInstance.Data[8], device_info.ChannelInstance.Data[9], device_info.ChannelInstance.Data[10], device_info.ChannelInstance.Data[11], device_info.ChannelInstance.Data[12], device_info.ChannelInstance.Data[13], device_info.ChannelInstance.Data[14], device_info.ChannelInstance.Data[15]);
 184         }
 185         else if (!strcmp(dev_attr->attr.name, "state"))
 186         {
 187                 return sprintf(buf, "%d\n", device_info.ChannelState);
 188         }
 189         else if (!strcmp(dev_attr->attr.name, "id"))
 190         {
 191                 return sprintf(buf, "%d\n", device_info.ChannelId);
 192         }
 193         else if (!strcmp(dev_attr->attr.name, "out_intr_mask"))
 194         {
 195                 return sprintf(buf, "%d\n", device_info.Outbound.InterruptMask);
 196         }
 197         else if (!strcmp(dev_attr->attr.name, "out_read_index"))
 198         {
 199                 return sprintf(buf, "%d\n", device_info.Outbound.ReadIndex);
 200         }
 201         else if (!strcmp(dev_attr->attr.name, "out_write_index"))
 202         {
 203                 return sprintf(buf, "%d\n", device_info.Outbound.WriteIndex);
 204         }
 205         else if (!strcmp(dev_attr->attr.name, "out_read_bytes_avail"))
 206         {
 207                 return sprintf(buf, "%d\n", device_info.Outbound.BytesAvailToRead);
 208         }
 209         else if (!strcmp(dev_attr->attr.name, "out_write_bytes_avail"))
 210         {
 211                 return sprintf(buf, "%d\n", device_info.Outbound.BytesAvailToWrite);
 212         }
 213         else if (!strcmp(dev_attr->attr.name, "in_intr_mask"))
 214         {
 215                 return sprintf(buf, "%d\n", device_info.Inbound.InterruptMask);
 216         }
 217         else if (!strcmp(dev_attr->attr.name, "in_read_index"))
 218         {
 219                 return sprintf(buf, "%d\n", device_info.Inbound.ReadIndex);
 220         }
 221         else if (!strcmp(dev_attr->attr.name, "in_write_index"))
 222         {
 223                 return sprintf(buf, "%d\n", device_info.Inbound.WriteIndex);
 224         }
 225         else if (!strcmp(dev_attr->attr.name, "in_read_bytes_avail"))
 226         {
 227                 return sprintf(buf, "%d\n", device_info.Inbound.BytesAvailToRead);
 228         }
 229         else if (!strcmp(dev_attr->attr.name, "in_write_bytes_avail"))
 230         {
 231                 return sprintf(buf, "%d\n", device_info.Inbound.BytesAvailToWrite);
 232         }
 233         else if (!strcmp(dev_attr->attr.name, "monitor_id"))
 234         {
 235                 return sprintf(buf, "%d\n", device_info.MonitorId);
 236         }
 237         else if (!strcmp(dev_attr->attr.name, "server_monitor_pending"))
 238         {
 239                 return sprintf(buf, "%d\n", device_info.ServerMonitorPending);
 240         }
 241         else if (!strcmp(dev_attr->attr.name, "server_monitor_latency"))
 242         {
 243                 return sprintf(buf, "%d\n", device_info.ServerMonitorLatency);
 244         }
 245         else if (!strcmp(dev_attr->attr.name, "server_monitor_conn_id"))
 246         {
 247                 return sprintf(buf, "%d\n", device_info.ServerMonitorConnectionId);
 248         }
 249         else if (!strcmp(dev_attr->attr.name, "client_monitor_pending"))
 250         {
 251                 return sprintf(buf, "%d\n", device_info.ClientMonitorPending);
 252         }
 253         else if (!strcmp(dev_attr->attr.name, "client_monitor_latency"))
 254         {
 255                 return sprintf(buf, "%d\n", device_info.ClientMonitorLatency);
 256         }
 257         else if (!strcmp(dev_attr->attr.name, "client_monitor_conn_id"))
 258         {
 259                 return sprintf(buf, "%d\n", device_info.ClientMonitorConnectionId);
 260         }
 261         else
 262         {
 263                 return 0;
 264         }
 265 }
 266
 267 /*++
 268
 269 Name:   vmbus_show_class_id()
 270
 271 Desc:   Show the device class id in sysfs
 272
 273 --*/
 274 /* static ssize_t vmbus_show_class_id(struct device *dev, struct device_attribute *attr, char *buf) */
 275 /* { */
 276 /* struct device_context *device_ctx = device_to_device_context(dev); */
 277 /* return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n", */
 278 /*      device_ctx->class_id[3], device_ctx->class_id[2], device_ctx->class_id[1], device_ctx->class_id[0], */
 279 /*      device_ctx->class_id[5], device_ctx->class_id[4], */
 280 /*      device_ctx->class_id[7], device_ctx->class_id[6], */
 281 /*      device_ctx->class_id[8], device_ctx->class_id[9], device_ctx->class_id[10], device_ctx->class_id[11], device_ctx->class_id[12], device_ctx->class_id[13], device_ctx->class_id[14], device_ctx->class_id[15]); */
 282 /* } */
 283
 284 /*++
 285
 286 Name:   vmbus_show_device_id()
 287
 288 Desc:   Show the device instance id in sysfs
 289
 290 --*/
 291 /* static ssize_t vmbus_show_device_id(struct device *dev, struct device_attribute *attr, char *buf) */
 292 /* { */
 293 /* struct device_context *device_ctx = device_to_device_context(dev); */
 294 /* return sprintf(buf, "{%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}\n", */
 295 /*      device_ctx->device_id[3], device_ctx->device_id[2], device_ctx->device_id[1], device_ctx->device_id[0], */
 296 /*      device_ctx->device_id[5], device_ctx->device_id[4], */
 297 /*      device_ctx->device_id[7], device_ctx->device_id[6], */
 298 /*      device_ctx->device_id[8], device_ctx->device_id[9], device_ctx->device_id[10], device_ctx->device_id[11], device_ctx->device_id[12], device_ctx->device_id[13], device_ctx->device_id[14], device_ctx->device_id[15]); */
 299 /* } */
 300
 301 /*++
 302
 303 Name:   vmbus_bus_init()
 304
 305 Desc:   Main vmbus driver initialization routine. Here, we
 306                 - initialize the vmbus driver context
 307                 - setup various driver entry points
 308                 - invoke the vmbus hv main init routine
 309                 - get the irq resource
 310                 - invoke the vmbus to add the vmbus root device
 311                 - setup the vmbus root device
 312                 - retrieve the channel offers
 313 --*/
 314 int vmbus_bus_init(PFN_DRIVERINITIALIZE pfn_drv_init)
 315 {
 316         int ret=0;
 317         unsigned int vector=0;
 318
 319         struct vmbus_driver_context *vmbus_drv_ctx=&g_vmbus_drv;
 320         VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
 321
 322         struct device_context *dev_ctx=&g_vmbus_drv.device_ctx;
 323
 324         DPRINT_ENTER(VMBUS_DRV);
 325
 326         /* Set this up to allow lower layer to callback to add/remove child devices on the bus */
 327         vmbus_drv_obj->OnChildDeviceCreate = vmbus_child_device_create;
 328         vmbus_drv_obj->OnChildDeviceDestroy = vmbus_child_device_destroy;
 329         vmbus_drv_obj->OnChildDeviceAdd = vmbus_child_device_register;
 330         vmbus_drv_obj->OnChildDeviceRemove = vmbus_child_device_unregister;
 331
 332         /* Call to bus driver to initialize */
 333         ret = pfn_drv_init(&vmbus_drv_obj->Base);
 334         if (ret != 0)
 335         {
 336                 DPRINT_ERR(VMBUS_DRV, "Unable to initialize vmbus (%d)", ret);
 337                 goto cleanup;
 338         }
 339
 340         /* Sanity checks */
 341         if (!vmbus_drv_obj->Base.OnDeviceAdd)
 342         {
 343                 DPRINT_ERR(VMBUS_DRV, "OnDeviceAdd() routine not set");
 344                 ret = -1;
 345                 goto cleanup;
 346         }
 347
 348         vmbus_drv_ctx->bus.name = vmbus_drv_obj->Base.name;
 349
 350         /* Initialize the bus context */
 351         tasklet_init(&vmbus_drv_ctx->msg_dpc, vmbus_msg_dpc, (unsigned long)vmbus_drv_obj);
 352         tasklet_init(&vmbus_drv_ctx->event_dpc, vmbus_event_dpc, (unsigned long)vmbus_drv_obj);
 353
 354         /* Now, register the bus driver with LDM */
 355         ret = bus_register(&vmbus_drv_ctx->bus);
 356         if (ret)
 357         {
 358                 ret = -1;
 359                 goto cleanup;
 360         }
 361
 362         /* Get the interrupt resource */
 363         ret = request_irq(vmbus_irq,
 364                           vmbus_isr,
 365                           IRQF_SAMPLE_RANDOM,
 366                           vmbus_drv_obj->Base.name,
 367                           NULL);
 368
 369         if (ret != 0)
 370         {
 371                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to request IRQ %d", vmbus_irq);
 372
 373                 bus_unregister(&vmbus_drv_ctx->bus);
 374
 375                 ret = -1;
 376                 goto cleanup;
 377         }
 378         vector = VMBUS_IRQ_VECTOR;
 379
 380         DPRINT_INFO(VMBUS_DRV, "irq 0x%x vector 0x%x", vmbus_irq, vector);
 381
 382         /* Call to bus driver to add the root device */
 383         memset(dev_ctx, 0, sizeof(struct device_context));
 384
 385         ret = vmbus_drv_obj->Base.OnDeviceAdd(&dev_ctx->device_obj, &vector);
 386         if (ret != 0)
 387         {
 388                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to add vmbus root device");
 389
 390                 free_irq(vmbus_irq, NULL);
 391
 392                 bus_unregister(&vmbus_drv_ctx->bus);
 393
 394                 ret = -1;
 395                 goto cleanup;
 396         }
 397         /* strcpy(dev_ctx->device.bus_id, dev_ctx->device_obj.name); */
 398         dev_set_name(&dev_ctx->device, "vmbus_0_0");
 399         memcpy(&dev_ctx->class_id, &dev_ctx->device_obj.deviceType, sizeof(GUID));
 400         memcpy(&dev_ctx->device_id, &dev_ctx->device_obj.deviceInstance, sizeof(GUID));
 401
 402         /* No need to bind a driver to the root device. */
 403         dev_ctx->device.parent = NULL;
 404         dev_ctx->device.bus = &vmbus_drv_ctx->bus; /* NULL; vmbus_remove() does not get invoked */
 405
 406         /* Setup the device dispatch table */
 407         dev_ctx->device.release = vmbus_bus_release;
 408
 409         /* Setup the bus as root device */
 410         ret = device_register(&dev_ctx->device);
 411         if (ret)
 412         {
 413                 DPRINT_ERR(VMBUS_DRV, "ERROR - Unable to register vmbus root device");
 414
 415                 free_irq(vmbus_irq, NULL);
 416                 bus_unregister(&vmbus_drv_ctx->bus);
 417
 418                 ret = -1;
 419                 goto cleanup;
 420         }
 421
 422
 423         vmbus_drv_obj->GetChannelOffers();
 424
 425 cleanup:
 426         DPRINT_EXIT(VMBUS_DRV);
 427
 428         return ret;
 429 }
 430
 431
 432 /*++
 433
 434 Name:   vmbus_bus_exit()
 435
 436 Desc:   Terminate the vmbus driver. This routine is opposite of vmbus_bus_init()
 437
 438 --*/
 439 void vmbus_bus_exit(void)
 440 {
 441         VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
 442         struct vmbus_driver_context *vmbus_drv_ctx=&g_vmbus_drv;
 443
 444         struct device_context *dev_ctx=&g_vmbus_drv.device_ctx;
 445
 446         DPRINT_ENTER(VMBUS_DRV);
 447
 448         /* Remove the root device */
 449         if (vmbus_drv_obj->Base.OnDeviceRemove)
 450                 vmbus_drv_obj->Base.OnDeviceRemove(&dev_ctx->device_obj);
 451
 452         if (vmbus_drv_obj->Base.OnCleanup)
 453                 vmbus_drv_obj->Base.OnCleanup(&vmbus_drv_obj->Base);
 454
 455         /* Unregister the root bus device */
 456         device_unregister(&dev_ctx->device);
 457
 458         bus_unregister(&vmbus_drv_ctx->bus);
 459
 460         free_irq(vmbus_irq, NULL);
 461
 462         tasklet_kill(&vmbus_drv_ctx->msg_dpc);
 463         tasklet_kill(&vmbus_drv_ctx->event_dpc);
 464
 465         DPRINT_EXIT(VMBUS_DRV);
 466
 467         return;
 468 }
 469
 470 /*++
 471
 472 Name:   vmbus_child_driver_register()
 473
 474 Desc:   Register a vmbus's child driver
 475
 476 --*/
 477 int vmbus_child_driver_register(struct driver_context* driver_ctx)
 478 {
 479         VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
 480         int ret;
 481
 482         DPRINT_ENTER(VMBUS_DRV);
 483
 484         DPRINT_INFO(VMBUS_DRV, "child driver (%p) registering - name %s", driver_ctx, driver_ctx->driver.name);
 485
 486         /* The child driver on this vmbus */
 487         driver_ctx->driver.bus = &g_vmbus_drv.bus;
 488
 489         ret = driver_register(&driver_ctx->driver);
 490
 491         vmbus_drv_obj->GetChannelOffers();
 492
 493         DPRINT_EXIT(VMBUS_DRV);
 494
 495         return ret;
 496 }
 497
 498 EXPORT_SYMBOL(vmbus_child_driver_register);
 499
 500 /*++
 501
 502 Name:   vmbus_child_driver_unregister()
 503
 504 Desc:   Unregister a vmbus's child driver
 505
 506 --*/
 507 void vmbus_child_driver_unregister(struct driver_context* driver_ctx)
 508 {
 509         DPRINT_ENTER(VMBUS_DRV);
 510
 511         DPRINT_INFO(VMBUS_DRV, "child driver (%p) unregistering - name %s", driver_ctx, driver_ctx->driver.name);
 512
 513         driver_unregister(&driver_ctx->driver);
 514
 515         driver_ctx->driver.bus = NULL;
 516
 517         DPRINT_EXIT(VMBUS_DRV);
 518 }
 519
 520 EXPORT_SYMBOL(vmbus_child_driver_unregister);
 521
 522 /*++
 523
 524 Name:   vmbus_get_interface()
 525
 526 Desc:   Get the vmbus channel interface. This is invoked by child/client driver that sits
 527                 above vmbus
 528 --*/
 529 void vmbus_get_interface(VMBUS_CHANNEL_INTERFACE *interface)
 530 {
 531         VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
 532
 533         vmbus_drv_obj->GetChannelInterface(interface);
 534 }
 535
 536 EXPORT_SYMBOL(vmbus_get_interface);
 537
 538
 539 /*++
 540
 541 Name:   vmbus_child_device_get_info()
 542
 543 Desc:   Get the vmbus child device info. This is invoked to display various device attributes in sysfs.
 544 --*/
 545 static void vmbus_child_device_get_info(struct hv_device *device_obj, DEVICE_INFO *device_info)
 546 {
 547         VMBUS_DRIVER_OBJECT *vmbus_drv_obj=&g_vmbus_drv.drv_obj;
 548
 549         vmbus_drv_obj->GetChannelInfo(device_obj, device_info);
 550 }
 551
 552
 553 /*++
 554
 555 Name:   vmbus_child_device_create()
 556
 557 Desc:   Creates and registers a new child device on the vmbus.
 558
 559 --*/
 560 static struct hv_device *vmbus_child_device_create(GUID type, GUID instance, void* context)
 561 {
 562         struct device_context *child_device_ctx;
 563         struct hv_device *child_device_obj;
 564
 565         DPRINT_ENTER(VMBUS_DRV);
 566
 567         /* Allocate the new child device */
 568         child_device_ctx = kzalloc(sizeof(struct device_context), GFP_KERNEL);
 569         if (!child_device_ctx)
 570         {
 571                 DPRINT_ERR(VMBUS_DRV, "unable to allocate device_context for child device");
 572                 DPRINT_EXIT(VMBUS_DRV);
 573
 574                 return NULL;
 575         }
 576
 577         DPRINT_DBG(VMBUS_DRV, "child device (%p) allocated - "
 578                 "type {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x},"
 579                 "id {%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 580                 &child_device_ctx->device,
 581                 type.Data[3], type.Data[2], type.Data[1], type.Data[0], type.Data[5], type.Data[4], type.Data[7], type.Data[6], type.Data[8], type.Data[9], type.Data[10], type.Data[11], type.Data[12], type.Data[13], type.Data[14], type.Data[15],
 582                 instance.Data[3], instance.Data[2], instance.Data[1], instance.Data[0], instance.Data[5], instance.Data[4], instance.Data[7], instance.Data[6], instance.Data[8], instance.Data[9], instance.Data[10], instance.Data[11], instance.Data[12], instance.Data[13], instance.Data[14], instance.Data[15]);
 583
 584         child_device_obj = &child_device_ctx->device_obj;
 585         child_device_obj->context = context;
 586         memcpy(&child_device_obj->deviceType, &type, sizeof(GUID));
 587         memcpy(&child_device_obj->deviceInstance, &instance, sizeof(GUID));
 588
 589         memcpy(&child_device_ctx->class_id, &type, sizeof(GUID));
 590         memcpy(&child_device_ctx->device_id, &instance, sizeof(GUID));
 591
 592         DPRINT_EXIT(VMBUS_DRV);
 593
 594         return child_device_obj;
 595 }
 596
 597 /*++
 598
 599 Name:   vmbus_child_device_register()
 600
 601 Desc:   Register the child device on the specified bus
 602
 603 --*/
 604 static int vmbus_child_device_register(struct hv_device *root_device_obj, struct hv_device *child_device_obj)
 605 {
 606         int ret=0;
 607         struct device_context *root_device_ctx = to_device_context(root_device_obj);
 608         struct device_context *child_device_ctx = to_device_context(child_device_obj);
 609         static int device_num=0;
 610
 611         DPRINT_ENTER(VMBUS_DRV);
 612
 613         DPRINT_DBG(VMBUS_DRV, "child device (%p) registering", child_device_ctx);
 614
 615         /* Make sure we are not registered already */
 616
 617         if (strlen(dev_name(&child_device_ctx->device)) != 0)
 618         {
 619                 DPRINT_ERR(VMBUS_DRV, "child device (%p) already registered - busid %s", child_device_ctx, dev_name(&child_device_ctx->device));
 620
 621                 ret = -1;
 622                 goto Cleanup;
 623         }
 624
 625         /* Set the device bus id. Otherwise, device_register()will fail. */
 626         dev_set_name(&child_device_ctx->device, "vmbus_0_%d", InterlockedIncrement(&device_num));
 627
 628         /* The new device belongs to this bus */
 629         child_device_ctx->device.bus = &g_vmbus_drv.bus; /* device->dev.bus; */
 630         child_device_ctx->device.parent = &root_device_ctx->device;
 631         child_device_ctx->device.release = vmbus_device_release;
 632
 633         /* Register with the LDM. This will kick off the driver/device binding...which will */
 634         /* eventually call vmbus_match() and vmbus_probe() */
 635         ret = device_register(&child_device_ctx->device);
 636
 637         /* vmbus_probe() error does not get propergate to device_register(). */
 638         ret = child_device_ctx->probe_error;
 639
 640         if (ret)
 641                 DPRINT_ERR(VMBUS_DRV, "unable to register child device (%p)", &child_device_ctx->device);
 642         else
 643                 DPRINT_INFO(VMBUS_DRV, "child device (%p) registered", &child_device_ctx->device);
 644
 645 Cleanup:
 646         DPRINT_EXIT(VMBUS_DRV);
 647
 648         return ret;
 649 }
 650
 651 /*++
 652
 653 Name:   vmbus_child_device_unregister()
 654
 655 Desc:   Remove the specified child device from the vmbus.
 656
 657 --*/
 658 static void vmbus_child_device_unregister(struct hv_device *device_obj)
 659 {
 660         struct device_context *device_ctx = to_device_context(device_obj);
 661
 662         DPRINT_ENTER(VMBUS_DRV);
 663
 664         DPRINT_INFO(VMBUS_DRV, "unregistering child device (%p)", &device_ctx->device);
 665
 666         /* Kick off the process of unregistering the device. */
 667         /* This will call vmbus_remove() and eventually vmbus_device_release() */
 668         device_unregister(&device_ctx->device);
 669
 670         DPRINT_INFO(VMBUS_DRV, "child device (%p) unregistered", &device_ctx->device);
 671
 672         DPRINT_EXIT(VMBUS_DRV);
 673 }
 674
 675
 676 /*++
 677
 678 Name:   vmbus_child_device_destroy()
 679
 680 Desc:   Destroy the specified child device on the vmbus.
 681
 682 --*/
 683 static void vmbus_child_device_destroy(struct hv_device *device_obj)
 684 {
 685         DPRINT_ENTER(VMBUS_DRV);
 686
 687         DPRINT_EXIT(VMBUS_DRV);
 688 }
 689
 690 /*++
 691
 692 Name:   vmbus_uevent()
 693
 694 Desc:   This routine is invoked when a device is added or removed on the vmbus to generate a uevent to udev in the
 695                 userspace. The udev will then look at its rule and the uevent generated here to load the appropriate driver
 696
 697 --*/
 698 static int vmbus_uevent(struct device *device, struct kobj_uevent_env *env)
 699 {
 700         struct device_context *device_ctx = device_to_device_context(device);
 701         int i=0;
 702         int len=0;
 703         int ret;
 704
 705         DPRINT_ENTER(VMBUS_DRV);
 706
 707         DPRINT_INFO(VMBUS_DRV, "generating uevent - VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 708                 device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
 709                 device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
 710                 device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
 711                 device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
 712                 device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
 713
 714         env->envp_idx = i;
 715         env->buflen = len;
 716         ret = add_uevent_var(env,
 717                 "VMBUS_DEVICE_CLASS_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 718                 device_ctx->class_id.Data[3], device_ctx->class_id.Data[2], device_ctx->class_id.Data[1], device_ctx->class_id.Data[0],
 719                 device_ctx->class_id.Data[5], device_ctx->class_id.Data[4],
 720                 device_ctx->class_id.Data[7], device_ctx->class_id.Data[6],
 721                 device_ctx->class_id.Data[8], device_ctx->class_id.Data[9], device_ctx->class_id.Data[10], device_ctx->class_id.Data[11],
 722                 device_ctx->class_id.Data[12], device_ctx->class_id.Data[13], device_ctx->class_id.Data[14], device_ctx->class_id.Data[15]);
 723
 724         if (ret)
 725         {
 726                 return ret;
 727         }
 728
 729         ret = add_uevent_var(env,
 730                 "VMBUS_DEVICE_DEVICE_GUID={%02x%02x%02x%02x-%02x%02x-%02x%02x-%02x%02x%02x%02x%02x%02x%02x%02x}",
 731                 device_ctx->device_id.Data[3], device_ctx->device_id.Data[2], device_ctx->device_id.Data[1], device_ctx->device_id.Data[0],
 732                 device_ctx->device_id.Data[5], device_ctx->device_id.Data[4],
 733                 device_ctx->device_id.Data[7], device_ctx->device_id.Data[6],
 734                 device_ctx->device_id.Data[8], device_ctx->device_id.Data[9], device_ctx->device_id.Data[10], device_ctx->device_id.Data[11],
 735                 device_ctx->device_id.Data[12], device_ctx->device_id.Data[13], device_ctx->device_id.Data[14], device_ctx->device_id.Data[15]);
 736
 737         if (ret)
 738         {
 739                 return ret;
 740         }
 741
 742         env->envp[env->envp_idx] = NULL;
 743
 744         DPRINT_EXIT(VMBUS_DRV);
 745
 746         return 0;
 747 }
 748
 749 /*++
 750
 751 Name:   vmbus_match()
 752
 753 Desc:   Attempt to match the specified device to the specified driver
 754
 755 --*/
 756 static int vmbus_match(struct device *device, struct device_driver *driver)
 757 {
 758         int match=0;
 759         struct driver_context *driver_ctx = driver_to_driver_context(driver);
 760         struct device_context *device_ctx = device_to_device_context(device);
 761
 762         DPRINT_ENTER(VMBUS_DRV);
 763
 764         /* We found our driver ? */
 765         if (memcmp(&device_ctx->class_id, &driver_ctx->class_id, sizeof(GUID)) == 0)
 766         {
 767                 /* !! NOTE: The driver_ctx is not a vmbus_drv_ctx. We typecast it here to access the */
 768                 /* DRIVER_OBJECT field */
 769                 struct vmbus_driver_context *vmbus_drv_ctx = (struct vmbus_driver_context*)driver_ctx;
 770                 device_ctx->device_obj.Driver = &vmbus_drv_ctx->drv_obj.Base;
 771                 DPRINT_INFO(VMBUS_DRV, "device object (%p) set to driver object (%p)", &device_ctx->device_obj, device_ctx->device_obj.Driver);
 772
 773                 match = 1;
 774         }
 775
 776         DPRINT_EXIT(VMBUS_DRV);
 777
 778         return match;
 779 }
 780
 781
 782 /*++
 783
 784 Name:   vmbus_probe_failed_cb()
 785
 786 Desc:   Callback when a driver probe failed in vmbus_probe(). We need a callback because
 787                 we cannot invoked device_unregister() inside vmbus_probe() since vmbus_probe() may be
 788                 invoked inside device_register() i.e. we cannot call device_unregister() inside
 789                 device_register()
 790 --*/
 791 static void vmbus_probe_failed_cb(struct work_struct *context)
 792 {
 793         struct device_context *device_ctx = (struct device_context*)context;
 794
 795
 796         DPRINT_ENTER(VMBUS_DRV);
 797
 798         /* Kick off the process of unregistering the device. */
 799         /* This will call vmbus_remove() and eventually vmbus_device_release() */
 800         device_unregister(&device_ctx->device);
 801
 802         /* put_device(&device_ctx->device); */
 803         DPRINT_EXIT(VMBUS_DRV);
 804 }
 805
 806
 807 /*++
 808
 809 Name:   vmbus_probe()
 810
 811 Desc:   Add the new vmbus's child device
 812
 813 --*/
 814 static int vmbus_probe(struct device *child_device)
 815 {
 816         int ret=0;
 817         struct driver_context *driver_ctx = driver_to_driver_context(child_device->driver);
 818         struct device_context *device_ctx = device_to_device_context(child_device);
 819
 820         DPRINT_ENTER(VMBUS_DRV);
 821
 822         /* Let the specific open-source driver handles the probe if it can */
 823         if (driver_ctx->probe)
 824         {
 825                 ret = device_ctx->probe_error = driver_ctx->probe(child_device);
 826                 if (ret != 0)
 827                 {
 828                         DPRINT_ERR(VMBUS_DRV, "probe() failed for device %s (%p) on driver %s (%d)...", dev_name(child_device), child_device, child_device->driver->name, ret);
 829
 830                         INIT_WORK(&device_ctx->probe_failed_work_item, vmbus_probe_failed_cb);
 831                         schedule_work(&device_ctx->probe_failed_work_item);
 832                 }
 833         }
 834         else
 835         {
 836                 DPRINT_ERR(VMBUS_DRV, "probe() method not set for driver - %s", child_device->driver->name);
 837                 ret = -1;
 838         }
 839
 840         DPRINT_EXIT(VMBUS_DRV);
 841         return ret;
 842 }
 843
 844
 845 /*++
 846
 847 Name:   vmbus_remove()
 848
 849 Desc:   Remove a vmbus device
 850
 851 --*/
 852 static int vmbus_remove(struct device *child_device)
 853 {
 854         int ret=0;
 855         struct driver_context *driver_ctx;
 856
 857         DPRINT_ENTER(VMBUS_DRV);
 858
 859         /* Special case root bus device */
 860         if (child_device->parent == NULL)
 861         {
 862                 /* No-op since it is statically defined and handle in vmbus_bus_exit() */
 863                 DPRINT_EXIT(VMBUS_DRV);
 864                 return 0;
 865         }
 866
 867         if (child_device->driver)
 868         {
 869                 driver_ctx = driver_to_driver_context(child_device->driver);
 870
 871                 /* Let the specific open-source driver handles the removal if it can */
 872                 if (driver_ctx->remove)
 873                 {
 874                         ret = driver_ctx->remove(child_device);
 875                 }
 876                 else
 877                 {
 878                         DPRINT_ERR(VMBUS_DRV, "remove() method not set for driver - %s", child_device->driver->name);
 879                         ret = -1;
 880                 }
 881         }
 882         else
 883         {
 884
 885         }
 886
 887         DPRINT_EXIT(VMBUS_DRV);
 888
 889         return 0;
 890 }
 891
 892 /*++
 893
 894 Name:   vmbus_shutdown()
 895
 896 Desc:   Shutdown a vmbus device
 897
 898 --*/
 899 static void vmbus_shutdown(struct device *child_device)
 900 {
 901         struct driver_context *driver_ctx;
 902
 903         DPRINT_ENTER(VMBUS_DRV);
 904
 905         /* Special case root bus device */
 906         if (child_device->parent == NULL)
 907         {
 908                 /* No-op since it is statically defined and handle in vmbus_bus_exit() */
 909                 DPRINT_EXIT(VMBUS_DRV);
 910                 return;
 911         }
 912
 913         /* The device may not be attached yet */
 914         if (!child_device->driver)
 915         {
 916                 DPRINT_EXIT(VMBUS_DRV);
 917                 return;
 918         }
 919
 920         driver_ctx = driver_to_driver_context(child_device->driver);
 921
 922         /* Let the specific open-source driver handles the removal if it can */
 923         if (driver_ctx->shutdown)
 924         {
 925                 driver_ctx->shutdown(child_device);
 926         }
 927
 928         DPRINT_EXIT(VMBUS_DRV);
 929
 930         return;
 931 }
 932
 933 /*++
 934
 935 Name:   vmbus_bus_release()
 936
 937 Desc:   Final callback release of the vmbus root device
 938
 939 --*/
 940 static void vmbus_bus_release(struct device *device)
 941 {
 942         DPRINT_ENTER(VMBUS_DRV);
 943         DPRINT_EXIT(VMBUS_DRV);
 944 }
 945
 946 /*++
 947
 948 Name:   vmbus_device_release()
 949
 950 Desc:   Final callback release of the vmbus child device
 951
 952 --*/
 953 static void vmbus_device_release(struct device *device)
 954 {
 955         struct device_context *device_ctx = device_to_device_context(device);
 956
 957         DPRINT_ENTER(VMBUS_DRV);
 958
 959         /* vmbus_child_device_destroy(&device_ctx->device_obj); */
 960         kfree(device_ctx);
 961
 962         /* !!DO NOT REFERENCE device_ctx anymore at this point!! */
 963
 964         DPRINT_EXIT(VMBUS_DRV);
 965
 966         return;
 967 }
 968
 969 /*++
 970
 971 Name:   vmbus_msg_dpc()
 972
 973 Desc:   Tasklet routine to handle hypervisor messages
 974
 975 --*/
 976 static void vmbus_msg_dpc(unsigned long data)
 977 {
 978         VMBUS_DRIVER_OBJECT* vmbus_drv_obj = (VMBUS_DRIVER_OBJECT*)data;
 979
 980         DPRINT_ENTER(VMBUS_DRV);
 981
 982         ASSERT(vmbus_drv_obj->OnMsgDpc != NULL);
 983
 984         /* Call to bus driver to handle interrupt */
 985         vmbus_drv_obj->OnMsgDpc(&vmbus_drv_obj->Base);
 986
 987         DPRINT_EXIT(VMBUS_DRV);
 988 }
 989
 990 /*++
 991
 992 Name:   vmbus_msg_dpc()
 993
 994 Desc:   Tasklet routine to handle hypervisor events
 995
 996 --*/
 997 static void vmbus_event_dpc(unsigned long data)
 998 {
 999         VMBUS_DRIVER_OBJECT* vmbus_drv_obj = (VMBUS_DRIVER_OBJECT*)data;
1000
1001         DPRINT_ENTER(VMBUS_DRV);
1002
1003         ASSERT(vmbus_drv_obj->OnEventDpc != NULL);
1004
1005         /* Call to bus driver to handle interrupt */
1006         vmbus_drv_obj->OnEventDpc(&vmbus_drv_obj->Base);
1007
1008         DPRINT_EXIT(VMBUS_DRV);
1009 }
1010
1011 /*++
1012
1013 Name:   vmbus_msg_dpc()
1014
1015 Desc:   ISR routine
1016
1017 --*/
1018 static irqreturn_t vmbus_isr(int irq, void* dev_id)
1019 {
1020         int ret=0;
1021         VMBUS_DRIVER_OBJECT* vmbus_driver_obj = &g_vmbus_drv.drv_obj;
1022
1023         DPRINT_ENTER(VMBUS_DRV);
1024
1025         ASSERT(vmbus_driver_obj->OnIsr != NULL);
1026
1027         /* Call to bus driver to handle interrupt */
1028         ret = vmbus_driver_obj->OnIsr(&vmbus_driver_obj->Base);
1029
1030         /* Schedules a dpc if necessary */
1031         if (ret > 0)
1032         {
1033                 if (test_bit(0, (unsigned long*)&ret))
1034                 {
1035                         tasklet_schedule(&g_vmbus_drv.msg_dpc);
1036                 }
1037
1038                 if (test_bit(1, (unsigned long*)&ret))
1039                 {
1040                         tasklet_schedule(&g_vmbus_drv.event_dpc);
1041                 }
1042
1043                 DPRINT_EXIT(VMBUS_DRV);
1044                 return IRQ_HANDLED;
1045         }
1046         else
1047         {
1048                 DPRINT_EXIT(VMBUS_DRV);
1049                 return IRQ_NONE;
1050         }
1051 }
1052
1053 MODULE_LICENSE("GPL");
1054
1055
1056 /*++
1057
1058 Name:   vmbus_init()
1059
1060 Desc:   Main vmbus driver entry routine
1061
1062 --*/
1063 static int __init vmbus_init(void)
1064 {
1065         int ret=0;
1066
1067         DPRINT_ENTER(VMBUS_DRV);
1068
1069         DPRINT_INFO(VMBUS_DRV,
1070                 "Vmbus initializing.... current log level 0x%x (%x,%x)",
1071                 vmbus_loglevel, HIWORD(vmbus_loglevel), LOWORD(vmbus_loglevel));
1072 /* Todo: it is used for loglevel, to be ported to new kernel. */
1073
1074         ret = vmbus_bus_init(VmbusInitialize);
1075
1076         DPRINT_EXIT(VMBUS_DRV);
1077         return ret;
1078 }
1079
1080
1081
1082 /*++
1083
1084 Name:   vmbus_init()
1085
1086 Desc:   Main vmbus driver exit routine
1087
1088 --*/
1089 static void __exit vmbus_exit(void)
1090 {
1091         DPRINT_ENTER(VMBUS_DRV);
1092
1093         vmbus_bus_exit();
1094 /* Todo: it is used for loglevel, to be ported to new kernel. */
1095         DPRINT_EXIT(VMBUS_DRV);
1096
1097         return;
1098 }
1099
1100 module_param(vmbus_irq, int, S_IRUGO);
1101 module_param(vmbus_loglevel, int, S_IRUGO);
1102
1103 module_init(vmbus_init);
1104 module_exit(vmbus_exit);
1105 /* eof */