drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   4  *
   5  * This software is available to you under a choice of one of two
   6  * licenses.  You may choose to be licensed under the terms of the GNU
   7  * General Public License (GPL) Version 2, available from the file
   8  * COPYING in the main directory of this source tree, or the
   9  * OpenIB.org BSD license below:
  10  *
  11  *     Redistribution and use in source and binary forms, with or
  12  *     without modification, are permitted provided that the following
  13  *     conditions are met:
  14  *
  15  *      - Redistributions of source code must retain the above
  16  *        copyright notice, this list of conditions and the following
  17  *        disclaimer.
  18  *
  19  *      - Redistributions in binary form must reproduce the above
  20  *        copyright notice, this list of conditions and the following
  21  *        disclaimer in the documentation and/or other materials
  22  *        provided with the distribution.
  23  *
  24  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  25  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  26  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  27  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  28  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  29  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  30  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  31  * SOFTWARE.
  32  *
  33  * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
  34  */
  35
  36 #include <linux/module.h>
  37 #include <linux/init.h>
  38 #include <linux/device.h>
  39 #include <linux/err.h>
  40 #include <linux/fs.h>
  41 #include <linux/poll.h>
  42 #include <linux/file.h>
  43 #include <linux/mount.h>
  44
  45 #include <asm/uaccess.h>
  46
  47 #include "uverbs.h"
  48
  49 MODULE_AUTHOR("Roland Dreier");
  50 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  51 MODULE_LICENSE("Dual BSD/GPL");
  52
  53 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  54
  55 enum {
  56         IB_UVERBS_MAJOR       = 231,
  57         IB_UVERBS_BASE_MINOR  = 192,
  58         IB_UVERBS_MAX_DEVICES = 32
  59 };
  60
  61 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  62
  63 DECLARE_MUTEX(ib_uverbs_idr_mutex);
  64 DEFINE_IDR(ib_uverbs_pd_idr);
  65 DEFINE_IDR(ib_uverbs_mr_idr);
  66 DEFINE_IDR(ib_uverbs_mw_idr);
  67 DEFINE_IDR(ib_uverbs_ah_idr);
  68 DEFINE_IDR(ib_uverbs_cq_idr);
  69 DEFINE_IDR(ib_uverbs_qp_idr);
  70
  71 static spinlock_t map_lock;
  72 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  73
  74 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  75                                      const char __user *buf, int in_len,
  76                                      int out_len) = {
  77         [IB_USER_VERBS_CMD_QUERY_PARAMS]  = ib_uverbs_query_params,
  78         [IB_USER_VERBS_CMD_GET_CONTEXT]   = ib_uverbs_get_context,
  79         [IB_USER_VERBS_CMD_QUERY_DEVICE]  = ib_uverbs_query_device,
  80         [IB_USER_VERBS_CMD_QUERY_PORT]    = ib_uverbs_query_port,
  81         [IB_USER_VERBS_CMD_QUERY_GID]     = ib_uverbs_query_gid,
  82         [IB_USER_VERBS_CMD_QUERY_PKEY]    = ib_uverbs_query_pkey,
  83         [IB_USER_VERBS_CMD_ALLOC_PD]      = ib_uverbs_alloc_pd,
  84         [IB_USER_VERBS_CMD_DEALLOC_PD]    = ib_uverbs_dealloc_pd,
  85         [IB_USER_VERBS_CMD_REG_MR]        = ib_uverbs_reg_mr,
  86         [IB_USER_VERBS_CMD_DEREG_MR]      = ib_uverbs_dereg_mr,
  87         [IB_USER_VERBS_CMD_CREATE_CQ]     = ib_uverbs_create_cq,
  88         [IB_USER_VERBS_CMD_DESTROY_CQ]    = ib_uverbs_destroy_cq,
  89         [IB_USER_VERBS_CMD_CREATE_QP]     = ib_uverbs_create_qp,
  90         [IB_USER_VERBS_CMD_MODIFY_QP]     = ib_uverbs_modify_qp,
  91         [IB_USER_VERBS_CMD_DESTROY_QP]    = ib_uverbs_destroy_qp,
  92         [IB_USER_VERBS_CMD_ATTACH_MCAST]  = ib_uverbs_attach_mcast,
  93         [IB_USER_VERBS_CMD_DETACH_MCAST]  = ib_uverbs_detach_mcast,
  94 };
  95
  96 static struct vfsmount *uverbs_event_mnt;
  97
  98 static void ib_uverbs_add_one(struct ib_device *device);
  99 static void ib_uverbs_remove_one(struct ib_device *device);
 100
 101 static int ib_dealloc_ucontext(struct ib_ucontext *context)
 102 {
 103         struct ib_uobject *uobj, *tmp;
 104
 105         if (!context)
 106                 return 0;
 107
 108         down(&ib_uverbs_idr_mutex);
 109
 110         /* XXX Free AHs */
 111
 112         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 113                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 114                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 115                 ib_destroy_qp(qp);
 116                 list_del(&uobj->list);
 117                 kfree(uobj);
 118         }
 119
 120         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 121                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 122                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 123                 ib_destroy_cq(cq);
 124                 list_del(&uobj->list);
 125                 kfree(uobj);
 126         }
 127
 128         /* XXX Free SRQs */
 129         /* XXX Free MWs */
 130
 131         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 132                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 133                 struct ib_umem_object *memobj;
 134
 135                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 136                 ib_dereg_mr(mr);
 137
 138                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 139                 ib_umem_release_on_close(mr->device, &memobj->umem);
 140
 141                 list_del(&uobj->list);
 142                 kfree(memobj);
 143         }
 144
 145         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 146                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 147                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 148                 ib_dealloc_pd(pd);
 149                 list_del(&uobj->list);
 150                 kfree(uobj);
 151         }
 152
 153         up(&ib_uverbs_idr_mutex);
 154
 155         return context->device->dealloc_ucontext(context);
 156 }
 157
 158 static void ib_uverbs_release_file(struct kref *ref)
 159 {
 160         struct ib_uverbs_file *file =
 161                 container_of(ref, struct ib_uverbs_file, ref);
 162
 163         module_put(file->device->ib_dev->owner);
 164         kfree(file);
 165 }
 166
 167 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 168                                     size_t count, loff_t *pos)
 169 {
 170         struct ib_uverbs_event_file *file = filp->private_data;
 171         void *event;
 172         int eventsz;
 173         int ret = 0;
 174
 175         spin_lock_irq(&file->lock);
 176
 177         while (list_empty(&file->event_list) && file->fd >= 0) {
 178                 spin_unlock_irq(&file->lock);
 179
 180                 if (filp->f_flags & O_NONBLOCK)
 181                         return -EAGAIN;
 182
 183                 if (wait_event_interruptible(file->poll_wait,
 184                                              !list_empty(&file->event_list) ||
 185                                              file->fd < 0))
 186                         return -ERESTARTSYS;
 187
 188                 spin_lock_irq(&file->lock);
 189         }
 190
 191         if (file->fd < 0) {
 192                 spin_unlock_irq(&file->lock);
 193                 return -ENODEV;
 194         }
 195
 196         if (file->is_async) {
 197                 event   = list_entry(file->event_list.next,
 198                                      struct ib_uverbs_async_event, list);
 199                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 200         } else {
 201                 event   = list_entry(file->event_list.next,
 202                                      struct ib_uverbs_comp_event, list);
 203                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 204         }
 205
 206         if (eventsz > count) {
 207                 ret   = -EINVAL;
 208                 event = NULL;
 209         } else
 210                 list_del(file->event_list.next);
 211
 212         spin_unlock_irq(&file->lock);
 213
 214         if (event) {
 215                 if (copy_to_user(buf, event, eventsz))
 216                         ret = -EFAULT;
 217                 else
 218                         ret = eventsz;
 219         }
 220
 221         kfree(event);
 222
 223         return ret;
 224 }
 225
 226 static unsigned int ib_uverbs_event_poll(struct file *filp,
 227                                          struct poll_table_struct *wait)
 228 {
 229         unsigned int pollflags = 0;
 230         struct ib_uverbs_event_file *file = filp->private_data;
 231
 232         poll_wait(filp, &file->poll_wait, wait);
 233
 234         spin_lock_irq(&file->lock);
 235         if (file->fd < 0)
 236                 pollflags = POLLERR;
 237         else if (!list_empty(&file->event_list))
 238                 pollflags = POLLIN | POLLRDNORM;
 239         spin_unlock_irq(&file->lock);
 240
 241         return pollflags;
 242 }
 243
 244 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
 245 {
 246         struct list_head *entry, *tmp;
 247
 248         spin_lock_irq(&file->lock);
 249         if (file->fd != -1) {
 250                 file->fd = -1;
 251                 list_for_each_safe(entry, tmp, &file->event_list)
 252                         if (file->is_async)
 253                                 kfree(list_entry(entry, struct ib_uverbs_async_event, list));
 254                         else
 255                                 kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
 256         }
 257         spin_unlock_irq(&file->lock);
 258 }
 259
 260 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 261 {
 262         struct ib_uverbs_event_file *file = filp->private_data;
 263
 264         ib_uverbs_event_release(file);
 265         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 266
 267         return 0;
 268 }
 269
 270 static struct file_operations uverbs_event_fops = {
 271         /*
 272          * No .owner field since we artificially create event files,
 273          * so there is no increment to the module reference count in
 274          * the open path.  All event files come from a uverbs command
 275          * file, which already takes a module reference, so this is OK.
 276          */
 277         .read    = ib_uverbs_event_read,
 278         .poll    = ib_uverbs_event_poll,
 279         .release = ib_uverbs_event_close
 280 };
 281
 282 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 283 {
 284         struct ib_uverbs_file       *file = cq_context;
 285         struct ib_uverbs_comp_event *entry;
 286         unsigned long                flags;
 287
 288         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 289         if (!entry)
 290                 return;
 291
 292         entry->desc.cq_handle = cq->uobject->user_handle;
 293
 294         spin_lock_irqsave(&file->comp_file[0].lock, flags);
 295         list_add_tail(&entry->list, &file->comp_file[0].event_list);
 296         spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
 297
 298         wake_up_interruptible(&file->comp_file[0].poll_wait);
 299 }
 300
 301 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 302                                     __u64 element, __u64 event)
 303 {
 304         struct ib_uverbs_async_event *entry;
 305         unsigned long flags;
 306
 307         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 308         if (!entry)
 309                 return;
 310
 311         entry->desc.element    = element;
 312         entry->desc.event_type = event;
 313
 314         spin_lock_irqsave(&file->async_file.lock, flags);
 315         list_add_tail(&entry->list, &file->async_file.event_list);
 316         spin_unlock_irqrestore(&file->async_file.lock, flags);
 317
 318         wake_up_interruptible(&file->async_file.poll_wait);
 319 }
 320
 321 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 322 {
 323         ib_uverbs_async_handler(context_ptr,
 324                                 event->element.cq->uobject->user_handle,
 325                                 event->event);
 326 }
 327
 328 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 329 {
 330         ib_uverbs_async_handler(context_ptr,
 331                                 event->element.qp->uobject->user_handle,
 332                                 event->event);
 333 }
 334
 335 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 336                                     struct ib_event *event)
 337 {
 338         struct ib_uverbs_file *file =
 339                 container_of(handler, struct ib_uverbs_file, event_handler);
 340
 341         ib_uverbs_async_handler(file, event->element.port_num, event->event);
 342 }
 343
 344 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
 345                                 struct ib_uverbs_file *uverbs_file)
 346 {
 347         struct file *filp;
 348
 349         spin_lock_init(&file->lock);
 350         INIT_LIST_HEAD(&file->event_list);
 351         init_waitqueue_head(&file->poll_wait);
 352         file->uverbs_file = uverbs_file;
 353
 354         file->fd = get_unused_fd();
 355         if (file->fd < 0)
 356                 return file->fd;
 357
 358         filp = get_empty_filp();
 359         if (!filp) {
 360                 put_unused_fd(file->fd);
 361                 return -ENFILE;
 362         }
 363
 364         filp->f_op         = &uverbs_event_fops;
 365         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 366         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 367         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 368         filp->f_flags      = O_RDONLY;
 369         filp->f_mode       = FMODE_READ;
 370         filp->private_data = file;
 371
 372         fd_install(file->fd, filp);
 373
 374         return 0;
 375 }
 376
 377 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 378                              size_t count, loff_t *pos)
 379 {
 380         struct ib_uverbs_file *file = filp->private_data;
 381         struct ib_uverbs_cmd_hdr hdr;
 382
 383         if (count < sizeof hdr)
 384                 return -EINVAL;
 385
 386         if (copy_from_user(&hdr, buf, sizeof hdr))
 387                 return -EFAULT;
 388
 389         if (hdr.in_words * 4 != count)
 390                 return -EINVAL;
 391
 392         if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
 393                 return -EINVAL;
 394
 395         if (!file->ucontext                               &&
 396             hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
 397             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 398                 return -EINVAL;
 399
 400         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 401                                              hdr.in_words * 4, hdr.out_words * 4);
 402 }
 403
 404 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 405 {
 406         struct ib_uverbs_file *file = filp->private_data;
 407
 408         if (!file->ucontext)
 409                 return -ENODEV;
 410         else
 411                 return file->device->ib_dev->mmap(file->ucontext, vma);
 412 }
 413
 414 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 415 {
 416         struct ib_uverbs_device *dev =
 417                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 418         struct ib_uverbs_file *file;
 419         int i = 0;
 420         int ret;
 421
 422         if (!try_module_get(dev->ib_dev->owner))
 423                 return -ENODEV;
 424
 425         file = kmalloc(sizeof *file +
 426                        (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
 427                        GFP_KERNEL);
 428         if (!file)
 429                 return -ENOMEM;
 430
 431         file->device = dev;
 432         kref_init(&file->ref);
 433
 434         file->ucontext = NULL;
 435
 436         ret = ib_uverbs_event_init(&file->async_file, file);
 437         if (ret)
 438                 goto err;
 439
 440         file->async_file.is_async = 1;
 441
 442         kref_get(&file->ref);
 443
 444         for (i = 0; i < dev->num_comp; ++i) {
 445                 ret = ib_uverbs_event_init(&file->comp_file[i], file);
 446                 if (ret)
 447                         goto err_async;
 448                 kref_get(&file->ref);
 449                 file->comp_file[i].is_async = 0;
 450         }
 451
 452
 453         filp->private_data = file;
 454
 455         INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
 456                               ib_uverbs_event_handler);
 457         if (ib_register_event_handler(&file->event_handler))
 458                 goto err_async;
 459
 460         return 0;
 461
 462 err_async:
 463         while (i--)
 464                 ib_uverbs_event_release(&file->comp_file[i]);
 465
 466         ib_uverbs_event_release(&file->async_file);
 467
 468 err:
 469         kref_put(&file->ref, ib_uverbs_release_file);
 470
 471         return ret;
 472 }
 473
 474 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 475 {
 476         struct ib_uverbs_file *file = filp->private_data;
 477         int i;
 478
 479         ib_unregister_event_handler(&file->event_handler);
 480         ib_uverbs_event_release(&file->async_file);
 481         ib_dealloc_ucontext(file->ucontext);
 482
 483         for (i = 0; i < file->device->num_comp; ++i)
 484                 ib_uverbs_event_release(&file->comp_file[i]);
 485
 486         kref_put(&file->ref, ib_uverbs_release_file);
 487
 488         return 0;
 489 }
 490
 491 static struct file_operations uverbs_fops = {
 492         .owner   = THIS_MODULE,
 493         .write   = ib_uverbs_write,
 494         .open    = ib_uverbs_open,
 495         .release = ib_uverbs_close
 496 };
 497
 498 static struct file_operations uverbs_mmap_fops = {
 499         .owner   = THIS_MODULE,
 500         .write   = ib_uverbs_write,
 501         .mmap    = ib_uverbs_mmap,
 502         .open    = ib_uverbs_open,
 503         .release = ib_uverbs_close
 504 };
 505
 506 static struct ib_client uverbs_client = {
 507         .name   = "uverbs",
 508         .add    = ib_uverbs_add_one,
 509         .remove = ib_uverbs_remove_one
 510 };
 511
 512 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 513 {
 514         struct ib_uverbs_device *dev =
 515                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 516
 517         return sprintf(buf, "%s\n", dev->ib_dev->name);
 518 }
 519 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 520
 521 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 522 {
 523         struct ib_uverbs_device *dev =
 524                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 525
 526         cdev_del(&dev->dev);
 527         clear_bit(dev->devnum, dev_map);
 528         kfree(dev);
 529 }
 530
 531 static struct class uverbs_class = {
 532         .name    = "infiniband_verbs",
 533         .release = ib_uverbs_release_class_dev
 534 };
 535
 536 static ssize_t show_abi_version(struct class *class, char *buf)
 537 {
 538         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 539 }
 540 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 541
 542 static void ib_uverbs_add_one(struct ib_device *device)
 543 {
 544         struct ib_uverbs_device *uverbs_dev;
 545
 546         if (!device->alloc_ucontext)
 547                 return;
 548
 549         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 550         if (!uverbs_dev)
 551                 return;
 552
 553         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 554
 555         spin_lock(&map_lock);
 556         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 557         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 558                 spin_unlock(&map_lock);
 559                 goto err;
 560         }
 561         set_bit(uverbs_dev->devnum, dev_map);
 562         spin_unlock(&map_lock);
 563
 564         uverbs_dev->ib_dev   = device;
 565         uverbs_dev->num_comp = 1;
 566
 567         if (device->mmap)
 568                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 569         else
 570                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 571         uverbs_dev->dev.owner = THIS_MODULE;
 572         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 573         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 574                 goto err;
 575
 576         uverbs_dev->class_dev.class = &uverbs_class;
 577         uverbs_dev->class_dev.dev   = device->dma_device;
 578         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 579         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 580         if (class_device_register(&uverbs_dev->class_dev))
 581                 goto err_cdev;
 582
 583         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 584                 goto err_class;
 585
 586         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 587
 588         return;
 589
 590 err_class:
 591         class_device_unregister(&uverbs_dev->class_dev);
 592
 593 err_cdev:
 594         cdev_del(&uverbs_dev->dev);
 595         clear_bit(uverbs_dev->devnum, dev_map);
 596
 597 err:
 598         kfree(uverbs_dev);
 599         return;
 600 }
 601
 602 static void ib_uverbs_remove_one(struct ib_device *device)
 603 {
 604         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 605
 606         if (!uverbs_dev)
 607                 return;
 608
 609         class_device_unregister(&uverbs_dev->class_dev);
 610 }
 611
 612 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 613                                                const char *dev_name, void *data)
 614 {
 615         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 616                              INFINIBANDEVENTFS_MAGIC);
 617 }
 618
 619 static struct file_system_type uverbs_event_fs = {
 620         /* No owner field so module can be unloaded */
 621         .name    = "infinibandeventfs",
 622         .get_sb  = uverbs_event_get_sb,
 623         .kill_sb = kill_litter_super
 624 };
 625
 626 static int __init ib_uverbs_init(void)
 627 {
 628         int ret;
 629
 630         spin_lock_init(&map_lock);
 631
 632         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 633                                      "infiniband_verbs");
 634         if (ret) {
 635                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 636                 goto out;
 637         }
 638
 639         ret = class_register(&uverbs_class);
 640         if (ret) {
 641                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 642                 goto out_chrdev;
 643         }
 644
 645         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 646         if (ret) {
 647                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 648                 goto out_class;
 649         }
 650
 651         ret = register_filesystem(&uverbs_event_fs);
 652         if (ret) {
 653                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 654                 goto out_class;
 655         }
 656
 657         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 658         if (IS_ERR(uverbs_event_mnt)) {
 659                 ret = PTR_ERR(uverbs_event_mnt);
 660                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 661                 goto out_fs;
 662         }
 663
 664         ret = ib_register_client(&uverbs_client);
 665         if (ret) {
 666                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 667                 goto out_mnt;
 668         }
 669
 670         return 0;
 671
 672 out_mnt:
 673         mntput(uverbs_event_mnt);
 674
 675 out_fs:
 676         unregister_filesystem(&uverbs_event_fs);
 677
 678 out_class:
 679         class_unregister(&uverbs_class);
 680
 681 out_chrdev:
 682         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 683
 684 out:
 685         return ret;
 686 }
 687
 688 static void __exit ib_uverbs_cleanup(void)
 689 {
 690         ib_unregister_client(&uverbs_client);
 691         mntput(uverbs_event_mnt);
 692         unregister_filesystem(&uverbs_event_fs);
 693         class_unregister(&uverbs_class);
 694         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 695 }
 696
 697 module_init(ib_uverbs_init);
 698 module_exit(ib_uverbs_cleanup);