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   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/device.h>
  41 #include <linux/err.h>
  42 #include <linux/fs.h>
  43 #include <linux/poll.h>
  44 #include <linux/file.h>
  45 #include <linux/mount.h>
  46
  47 #include <asm/uaccess.h>
  48
  49 #include "uverbs.h"
  50
  51 MODULE_AUTHOR("Roland Dreier");
  52 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  56
  57 enum {
  58         IB_UVERBS_MAJOR       = 231,
  59         IB_UVERBS_BASE_MINOR  = 192,
  60         IB_UVERBS_MAX_DEVICES = 32
  61 };
  62
  63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  64
  65 DECLARE_MUTEX(ib_uverbs_idr_mutex);
  66 DEFINE_IDR(ib_uverbs_pd_idr);
  67 DEFINE_IDR(ib_uverbs_mr_idr);
  68 DEFINE_IDR(ib_uverbs_mw_idr);
  69 DEFINE_IDR(ib_uverbs_ah_idr);
  70 DEFINE_IDR(ib_uverbs_cq_idr);
  71 DEFINE_IDR(ib_uverbs_qp_idr);
  72
  73 static spinlock_t map_lock;
  74 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  75
  76 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  77                                      const char __user *buf, int in_len,
  78                                      int out_len) = {
  79         [IB_USER_VERBS_CMD_QUERY_PARAMS]  = ib_uverbs_query_params,
  80         [IB_USER_VERBS_CMD_GET_CONTEXT]   = ib_uverbs_get_context,
  81         [IB_USER_VERBS_CMD_QUERY_DEVICE]  = ib_uverbs_query_device,
  82         [IB_USER_VERBS_CMD_QUERY_PORT]    = ib_uverbs_query_port,
  83         [IB_USER_VERBS_CMD_QUERY_GID]     = ib_uverbs_query_gid,
  84         [IB_USER_VERBS_CMD_QUERY_PKEY]    = ib_uverbs_query_pkey,
  85         [IB_USER_VERBS_CMD_ALLOC_PD]      = ib_uverbs_alloc_pd,
  86         [IB_USER_VERBS_CMD_DEALLOC_PD]    = ib_uverbs_dealloc_pd,
  87         [IB_USER_VERBS_CMD_REG_MR]        = ib_uverbs_reg_mr,
  88         [IB_USER_VERBS_CMD_DEREG_MR]      = ib_uverbs_dereg_mr,
  89         [IB_USER_VERBS_CMD_CREATE_CQ]     = ib_uverbs_create_cq,
  90         [IB_USER_VERBS_CMD_DESTROY_CQ]    = ib_uverbs_destroy_cq,
  91         [IB_USER_VERBS_CMD_CREATE_QP]     = ib_uverbs_create_qp,
  92         [IB_USER_VERBS_CMD_MODIFY_QP]     = ib_uverbs_modify_qp,
  93         [IB_USER_VERBS_CMD_DESTROY_QP]    = ib_uverbs_destroy_qp,
  94         [IB_USER_VERBS_CMD_ATTACH_MCAST]  = ib_uverbs_attach_mcast,
  95         [IB_USER_VERBS_CMD_DETACH_MCAST]  = ib_uverbs_detach_mcast,
  96 };
  97
  98 static struct vfsmount *uverbs_event_mnt;
  99
 100 static void ib_uverbs_add_one(struct ib_device *device);
 101 static void ib_uverbs_remove_one(struct ib_device *device);
 102
 103 static int ib_dealloc_ucontext(struct ib_ucontext *context)
 104 {
 105         struct ib_uobject *uobj, *tmp;
 106
 107         if (!context)
 108                 return 0;
 109
 110         down(&ib_uverbs_idr_mutex);
 111
 112         /* XXX Free AHs */
 113
 114         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 115                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 116                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 117                 ib_destroy_qp(qp);
 118                 list_del(&uobj->list);
 119                 kfree(uobj);
 120         }
 121
 122         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 123                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 124                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 125                 ib_destroy_cq(cq);
 126                 list_del(&uobj->list);
 127                 kfree(uobj);
 128         }
 129
 130         /* XXX Free SRQs */
 131         /* XXX Free MWs */
 132
 133         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 134                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 135                 struct ib_device *mrdev = mr->device;
 136                 struct ib_umem_object *memobj;
 137
 138                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 139                 ib_dereg_mr(mr);
 140
 141                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 142                 ib_umem_release_on_close(mrdev, &memobj->umem);
 143
 144                 list_del(&uobj->list);
 145                 kfree(memobj);
 146         }
 147
 148         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 149                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 150                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 151                 ib_dealloc_pd(pd);
 152                 list_del(&uobj->list);
 153                 kfree(uobj);
 154         }
 155
 156         up(&ib_uverbs_idr_mutex);
 157
 158         return context->device->dealloc_ucontext(context);
 159 }
 160
 161 static void ib_uverbs_release_file(struct kref *ref)
 162 {
 163         struct ib_uverbs_file *file =
 164                 container_of(ref, struct ib_uverbs_file, ref);
 165
 166         module_put(file->device->ib_dev->owner);
 167         kfree(file);
 168 }
 169
 170 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 171                                     size_t count, loff_t *pos)
 172 {
 173         struct ib_uverbs_event_file *file = filp->private_data;
 174         void *event;
 175         int eventsz;
 176         int ret = 0;
 177
 178         spin_lock_irq(&file->lock);
 179
 180         while (list_empty(&file->event_list) && file->fd >= 0) {
 181                 spin_unlock_irq(&file->lock);
 182
 183                 if (filp->f_flags & O_NONBLOCK)
 184                         return -EAGAIN;
 185
 186                 if (wait_event_interruptible(file->poll_wait,
 187                                              !list_empty(&file->event_list) ||
 188                                              file->fd < 0))
 189                         return -ERESTARTSYS;
 190
 191                 spin_lock_irq(&file->lock);
 192         }
 193
 194         if (file->fd < 0) {
 195                 spin_unlock_irq(&file->lock);
 196                 return -ENODEV;
 197         }
 198
 199         if (file->is_async) {
 200                 event   = list_entry(file->event_list.next,
 201                                      struct ib_uverbs_async_event, list);
 202                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 203         } else {
 204                 event   = list_entry(file->event_list.next,
 205                                      struct ib_uverbs_comp_event, list);
 206                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 207         }
 208
 209         if (eventsz > count) {
 210                 ret   = -EINVAL;
 211                 event = NULL;
 212         } else
 213                 list_del(file->event_list.next);
 214
 215         spin_unlock_irq(&file->lock);
 216
 217         if (event) {
 218                 if (copy_to_user(buf, event, eventsz))
 219                         ret = -EFAULT;
 220                 else
 221                         ret = eventsz;
 222         }
 223
 224         kfree(event);
 225
 226         return ret;
 227 }
 228
 229 static unsigned int ib_uverbs_event_poll(struct file *filp,
 230                                          struct poll_table_struct *wait)
 231 {
 232         unsigned int pollflags = 0;
 233         struct ib_uverbs_event_file *file = filp->private_data;
 234
 235         poll_wait(filp, &file->poll_wait, wait);
 236
 237         spin_lock_irq(&file->lock);
 238         if (file->fd < 0)
 239                 pollflags = POLLERR;
 240         else if (!list_empty(&file->event_list))
 241                 pollflags = POLLIN | POLLRDNORM;
 242         spin_unlock_irq(&file->lock);
 243
 244         return pollflags;
 245 }
 246
 247 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
 248 {
 249         struct list_head *entry, *tmp;
 250
 251         spin_lock_irq(&file->lock);
 252         if (file->fd != -1) {
 253                 file->fd = -1;
 254                 list_for_each_safe(entry, tmp, &file->event_list)
 255                         if (file->is_async)
 256                                 kfree(list_entry(entry, struct ib_uverbs_async_event, list));
 257                         else
 258                                 kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
 259         }
 260         spin_unlock_irq(&file->lock);
 261 }
 262
 263 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 264 {
 265         struct ib_uverbs_event_file *file = filp->private_data;
 266
 267         return fasync_helper(fd, filp, on, &file->async_queue);
 268 }
 269
 270 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 271 {
 272         struct ib_uverbs_event_file *file = filp->private_data;
 273
 274         ib_uverbs_event_release(file);
 275         ib_uverbs_event_fasync(-1, filp, 0);
 276         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 277
 278         return 0;
 279 }
 280
 281 static struct file_operations uverbs_event_fops = {
 282         /*
 283          * No .owner field since we artificially create event files,
 284          * so there is no increment to the module reference count in
 285          * the open path.  All event files come from a uverbs command
 286          * file, which already takes a module reference, so this is OK.
 287          */
 288         .read    = ib_uverbs_event_read,
 289         .poll    = ib_uverbs_event_poll,
 290         .release = ib_uverbs_event_close,
 291         .fasync  = ib_uverbs_event_fasync
 292 };
 293
 294 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 295 {
 296         struct ib_uverbs_file       *file = cq_context;
 297         struct ib_uverbs_comp_event *entry;
 298         unsigned long                flags;
 299
 300         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 301         if (!entry)
 302                 return;
 303
 304         entry->desc.cq_handle = cq->uobject->user_handle;
 305
 306         spin_lock_irqsave(&file->comp_file[0].lock, flags);
 307         list_add_tail(&entry->list, &file->comp_file[0].event_list);
 308         spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
 309
 310         wake_up_interruptible(&file->comp_file[0].poll_wait);
 311         kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
 312 }
 313
 314 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 315                                     __u64 element, __u64 event)
 316 {
 317         struct ib_uverbs_async_event *entry;
 318         unsigned long flags;
 319
 320         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 321         if (!entry)
 322                 return;
 323
 324         entry->desc.element    = element;
 325         entry->desc.event_type = event;
 326
 327         spin_lock_irqsave(&file->async_file.lock, flags);
 328         list_add_tail(&entry->list, &file->async_file.event_list);
 329         spin_unlock_irqrestore(&file->async_file.lock, flags);
 330
 331         wake_up_interruptible(&file->async_file.poll_wait);
 332         kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
 333 }
 334
 335 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 336 {
 337         ib_uverbs_async_handler(context_ptr,
 338                                 event->element.cq->uobject->user_handle,
 339                                 event->event);
 340 }
 341
 342 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 343 {
 344         ib_uverbs_async_handler(context_ptr,
 345                                 event->element.qp->uobject->user_handle,
 346                                 event->event);
 347 }
 348
 349 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 350                                     struct ib_event *event)
 351 {
 352         struct ib_uverbs_file *file =
 353                 container_of(handler, struct ib_uverbs_file, event_handler);
 354
 355         ib_uverbs_async_handler(file, event->element.port_num, event->event);
 356 }
 357
 358 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
 359                                 struct ib_uverbs_file *uverbs_file)
 360 {
 361         struct file *filp;
 362
 363         spin_lock_init(&file->lock);
 364         INIT_LIST_HEAD(&file->event_list);
 365         init_waitqueue_head(&file->poll_wait);
 366         file->uverbs_file = uverbs_file;
 367         file->async_queue = NULL;
 368
 369         file->fd = get_unused_fd();
 370         if (file->fd < 0)
 371                 return file->fd;
 372
 373         filp = get_empty_filp();
 374         if (!filp) {
 375                 put_unused_fd(file->fd);
 376                 return -ENFILE;
 377         }
 378
 379         filp->f_op         = &uverbs_event_fops;
 380         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 381         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 382         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 383         filp->f_flags      = O_RDONLY;
 384         filp->f_mode       = FMODE_READ;
 385         filp->private_data = file;
 386
 387         fd_install(file->fd, filp);
 388
 389         return 0;
 390 }
 391
 392 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 393                              size_t count, loff_t *pos)
 394 {
 395         struct ib_uverbs_file *file = filp->private_data;
 396         struct ib_uverbs_cmd_hdr hdr;
 397
 398         if (count < sizeof hdr)
 399                 return -EINVAL;
 400
 401         if (copy_from_user(&hdr, buf, sizeof hdr))
 402                 return -EFAULT;
 403
 404         if (hdr.in_words * 4 != count)
 405                 return -EINVAL;
 406
 407         if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
 408                 return -EINVAL;
 409
 410         if (!file->ucontext                               &&
 411             hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
 412             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 413                 return -EINVAL;
 414
 415         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 416                                              hdr.in_words * 4, hdr.out_words * 4);
 417 }
 418
 419 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 420 {
 421         struct ib_uverbs_file *file = filp->private_data;
 422
 423         if (!file->ucontext)
 424                 return -ENODEV;
 425         else
 426                 return file->device->ib_dev->mmap(file->ucontext, vma);
 427 }
 428
 429 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 430 {
 431         struct ib_uverbs_device *dev =
 432                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 433         struct ib_uverbs_file *file;
 434         int i = 0;
 435         int ret;
 436
 437         if (!try_module_get(dev->ib_dev->owner))
 438                 return -ENODEV;
 439
 440         file = kmalloc(sizeof *file +
 441                        (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
 442                        GFP_KERNEL);
 443         if (!file)
 444                 return -ENOMEM;
 445
 446         file->device = dev;
 447         kref_init(&file->ref);
 448
 449         file->ucontext = NULL;
 450
 451         ret = ib_uverbs_event_init(&file->async_file, file);
 452         if (ret)
 453                 goto err;
 454
 455         file->async_file.is_async = 1;
 456
 457         kref_get(&file->ref);
 458
 459         for (i = 0; i < dev->num_comp; ++i) {
 460                 ret = ib_uverbs_event_init(&file->comp_file[i], file);
 461                 if (ret)
 462                         goto err_async;
 463                 kref_get(&file->ref);
 464                 file->comp_file[i].is_async = 0;
 465         }
 466
 467
 468         filp->private_data = file;
 469
 470         INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
 471                               ib_uverbs_event_handler);
 472         if (ib_register_event_handler(&file->event_handler))
 473                 goto err_async;
 474
 475         return 0;
 476
 477 err_async:
 478         while (i--)
 479                 ib_uverbs_event_release(&file->comp_file[i]);
 480
 481         ib_uverbs_event_release(&file->async_file);
 482
 483 err:
 484         kref_put(&file->ref, ib_uverbs_release_file);
 485
 486         return ret;
 487 }
 488
 489 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 490 {
 491         struct ib_uverbs_file *file = filp->private_data;
 492         int i;
 493
 494         ib_unregister_event_handler(&file->event_handler);
 495         ib_uverbs_event_release(&file->async_file);
 496         ib_dealloc_ucontext(file->ucontext);
 497
 498         for (i = 0; i < file->device->num_comp; ++i)
 499                 ib_uverbs_event_release(&file->comp_file[i]);
 500
 501         kref_put(&file->ref, ib_uverbs_release_file);
 502
 503         return 0;
 504 }
 505
 506 static struct file_operations uverbs_fops = {
 507         .owner   = THIS_MODULE,
 508         .write   = ib_uverbs_write,
 509         .open    = ib_uverbs_open,
 510         .release = ib_uverbs_close
 511 };
 512
 513 static struct file_operations uverbs_mmap_fops = {
 514         .owner   = THIS_MODULE,
 515         .write   = ib_uverbs_write,
 516         .mmap    = ib_uverbs_mmap,
 517         .open    = ib_uverbs_open,
 518         .release = ib_uverbs_close
 519 };
 520
 521 static struct ib_client uverbs_client = {
 522         .name   = "uverbs",
 523         .add    = ib_uverbs_add_one,
 524         .remove = ib_uverbs_remove_one
 525 };
 526
 527 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 528 {
 529         struct ib_uverbs_device *dev =
 530                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 531
 532         return sprintf(buf, "%s\n", dev->ib_dev->name);
 533 }
 534 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 535
 536 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 537 {
 538         struct ib_uverbs_device *dev =
 539                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 540
 541         cdev_del(&dev->dev);
 542         clear_bit(dev->devnum, dev_map);
 543         kfree(dev);
 544 }
 545
 546 static struct class uverbs_class = {
 547         .name    = "infiniband_verbs",
 548         .release = ib_uverbs_release_class_dev
 549 };
 550
 551 static ssize_t show_abi_version(struct class *class, char *buf)
 552 {
 553         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 554 }
 555 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 556
 557 static void ib_uverbs_add_one(struct ib_device *device)
 558 {
 559         struct ib_uverbs_device *uverbs_dev;
 560
 561         if (!device->alloc_ucontext)
 562                 return;
 563
 564         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 565         if (!uverbs_dev)
 566                 return;
 567
 568         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 569
 570         spin_lock(&map_lock);
 571         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 572         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 573                 spin_unlock(&map_lock);
 574                 goto err;
 575         }
 576         set_bit(uverbs_dev->devnum, dev_map);
 577         spin_unlock(&map_lock);
 578
 579         uverbs_dev->ib_dev   = device;
 580         uverbs_dev->num_comp = 1;
 581
 582         if (device->mmap)
 583                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 584         else
 585                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 586         uverbs_dev->dev.owner = THIS_MODULE;
 587         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 588         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 589                 goto err;
 590
 591         uverbs_dev->class_dev.class = &uverbs_class;
 592         uverbs_dev->class_dev.dev   = device->dma_device;
 593         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 594         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 595         if (class_device_register(&uverbs_dev->class_dev))
 596                 goto err_cdev;
 597
 598         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 599                 goto err_class;
 600
 601         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 602
 603         return;
 604
 605 err_class:
 606         class_device_unregister(&uverbs_dev->class_dev);
 607
 608 err_cdev:
 609         cdev_del(&uverbs_dev->dev);
 610         clear_bit(uverbs_dev->devnum, dev_map);
 611
 612 err:
 613         kfree(uverbs_dev);
 614         return;
 615 }
 616
 617 static void ib_uverbs_remove_one(struct ib_device *device)
 618 {
 619         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 620
 621         if (!uverbs_dev)
 622                 return;
 623
 624         class_device_unregister(&uverbs_dev->class_dev);
 625 }
 626
 627 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 628                                                const char *dev_name, void *data)
 629 {
 630         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 631                              INFINIBANDEVENTFS_MAGIC);
 632 }
 633
 634 static struct file_system_type uverbs_event_fs = {
 635         /* No owner field so module can be unloaded */
 636         .name    = "infinibandeventfs",
 637         .get_sb  = uverbs_event_get_sb,
 638         .kill_sb = kill_litter_super
 639 };
 640
 641 static int __init ib_uverbs_init(void)
 642 {
 643         int ret;
 644
 645         spin_lock_init(&map_lock);
 646
 647         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 648                                      "infiniband_verbs");
 649         if (ret) {
 650                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 651                 goto out;
 652         }
 653
 654         ret = class_register(&uverbs_class);
 655         if (ret) {
 656                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 657                 goto out_chrdev;
 658         }
 659
 660         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 661         if (ret) {
 662                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 663                 goto out_class;
 664         }
 665
 666         ret = register_filesystem(&uverbs_event_fs);
 667         if (ret) {
 668                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 669                 goto out_class;
 670         }
 671
 672         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 673         if (IS_ERR(uverbs_event_mnt)) {
 674                 ret = PTR_ERR(uverbs_event_mnt);
 675                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 676                 goto out_fs;
 677         }
 678
 679         ret = ib_register_client(&uverbs_client);
 680         if (ret) {
 681                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 682                 goto out_mnt;
 683         }
 684
 685         return 0;
 686
 687 out_mnt:
 688         mntput(uverbs_event_mnt);
 689
 690 out_fs:
 691         unregister_filesystem(&uverbs_event_fs);
 692
 693 out_class:
 694         class_unregister(&uverbs_class);
 695
 696 out_chrdev:
 697         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 698
 699 out:
 700         return ret;
 701 }
 702
 703 static void __exit ib_uverbs_cleanup(void)
 704 {
 705         ib_unregister_client(&uverbs_client);
 706         mntput(uverbs_event_mnt);
 707         unregister_filesystem(&uverbs_event_fs);
 708         class_unregister(&uverbs_class);
 709         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 710 }
 711
 712 module_init(ib_uverbs_init);
 713 module_exit(ib_uverbs_cleanup);