git.oblomov.eu Git - linux-2.6/blob - 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_device *mrdev = mr->device;
 134                 struct ib_umem_object *memobj;
 135
 136                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 137                 ib_dereg_mr(mr);
 138
 139                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 140                 ib_umem_release_on_close(mrdev, &memobj->umem);
 141
 142                 list_del(&uobj->list);
 143                 kfree(memobj);
 144         }
 145
 146         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 147                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 148                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 149                 ib_dealloc_pd(pd);
 150                 list_del(&uobj->list);
 151                 kfree(uobj);
 152         }
 153
 154         up(&ib_uverbs_idr_mutex);
 155
 156         return context->device->dealloc_ucontext(context);
 157 }
 158
 159 static void ib_uverbs_release_file(struct kref *ref)
 160 {
 161         struct ib_uverbs_file *file =
 162                 container_of(ref, struct ib_uverbs_file, ref);
 163
 164         module_put(file->device->ib_dev->owner);
 165         kfree(file);
 166 }
 167
 168 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 169                                     size_t count, loff_t *pos)
 170 {
 171         struct ib_uverbs_event_file *file = filp->private_data;
 172         void *event;
 173         int eventsz;
 174         int ret = 0;
 175
 176         spin_lock_irq(&file->lock);
 177
 178         while (list_empty(&file->event_list) && file->fd >= 0) {
 179                 spin_unlock_irq(&file->lock);
 180
 181                 if (filp->f_flags & O_NONBLOCK)
 182                         return -EAGAIN;
 183
 184                 if (wait_event_interruptible(file->poll_wait,
 185                                              !list_empty(&file->event_list) ||
 186                                              file->fd < 0))
 187                         return -ERESTARTSYS;
 188
 189                 spin_lock_irq(&file->lock);
 190         }
 191
 192         if (file->fd < 0) {
 193                 spin_unlock_irq(&file->lock);
 194                 return -ENODEV;
 195         }
 196
 197         if (file->is_async) {
 198                 event   = list_entry(file->event_list.next,
 199                                      struct ib_uverbs_async_event, list);
 200                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 201         } else {
 202                 event   = list_entry(file->event_list.next,
 203                                      struct ib_uverbs_comp_event, list);
 204                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 205         }
 206
 207         if (eventsz > count) {
 208                 ret   = -EINVAL;
 209                 event = NULL;
 210         } else
 211                 list_del(file->event_list.next);
 212
 213         spin_unlock_irq(&file->lock);
 214
 215         if (event) {
 216                 if (copy_to_user(buf, event, eventsz))
 217                         ret = -EFAULT;
 218                 else
 219                         ret = eventsz;
 220         }
 221
 222         kfree(event);
 223
 224         return ret;
 225 }
 226
 227 static unsigned int ib_uverbs_event_poll(struct file *filp,
 228                                          struct poll_table_struct *wait)
 229 {
 230         unsigned int pollflags = 0;
 231         struct ib_uverbs_event_file *file = filp->private_data;
 232
 233         poll_wait(filp, &file->poll_wait, wait);
 234
 235         spin_lock_irq(&file->lock);
 236         if (file->fd < 0)
 237                 pollflags = POLLERR;
 238         else if (!list_empty(&file->event_list))
 239                 pollflags = POLLIN | POLLRDNORM;
 240         spin_unlock_irq(&file->lock);
 241
 242         return pollflags;
 243 }
 244
 245 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
 246 {
 247         struct list_head *entry, *tmp;
 248
 249         spin_lock_irq(&file->lock);
 250         if (file->fd != -1) {
 251                 file->fd = -1;
 252                 list_for_each_safe(entry, tmp, &file->event_list)
 253                         if (file->is_async)
 254                                 kfree(list_entry(entry, struct ib_uverbs_async_event, list));
 255                         else
 256                                 kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
 257         }
 258         spin_unlock_irq(&file->lock);
 259 }
 260
 261 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 262 {
 263         struct ib_uverbs_event_file *file = filp->private_data;
 264
 265         return fasync_helper(fd, filp, on, &file->async_queue);
 266 }
 267
 268 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 269 {
 270         struct ib_uverbs_event_file *file = filp->private_data;
 271
 272         ib_uverbs_event_release(file);
 273         ib_uverbs_event_fasync(-1, filp, 0);
 274         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 275
 276         return 0;
 277 }
 278
 279 static struct file_operations uverbs_event_fops = {
 280         /*
 281          * No .owner field since we artificially create event files,
 282          * so there is no increment to the module reference count in
 283          * the open path.  All event files come from a uverbs command
 284          * file, which already takes a module reference, so this is OK.
 285          */
 286         .read    = ib_uverbs_event_read,
 287         .poll    = ib_uverbs_event_poll,
 288         .release = ib_uverbs_event_close,
 289         .fasync  = ib_uverbs_event_fasync
 290 };
 291
 292 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 293 {
 294         struct ib_uverbs_file       *file = cq_context;
 295         struct ib_uverbs_comp_event *entry;
 296         unsigned long                flags;
 297
 298         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 299         if (!entry)
 300                 return;
 301
 302         entry->desc.cq_handle = cq->uobject->user_handle;
 303
 304         spin_lock_irqsave(&file->comp_file[0].lock, flags);
 305         list_add_tail(&entry->list, &file->comp_file[0].event_list);
 306         spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
 307
 308         wake_up_interruptible(&file->comp_file[0].poll_wait);
 309         kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
 310 }
 311
 312 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 313                                     __u64 element, __u64 event)
 314 {
 315         struct ib_uverbs_async_event *entry;
 316         unsigned long flags;
 317
 318         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 319         if (!entry)
 320                 return;
 321
 322         entry->desc.element    = element;
 323         entry->desc.event_type = event;
 324
 325         spin_lock_irqsave(&file->async_file.lock, flags);
 326         list_add_tail(&entry->list, &file->async_file.event_list);
 327         spin_unlock_irqrestore(&file->async_file.lock, flags);
 328
 329         wake_up_interruptible(&file->async_file.poll_wait);
 330         kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
 331 }
 332
 333 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 334 {
 335         ib_uverbs_async_handler(context_ptr,
 336                                 event->element.cq->uobject->user_handle,
 337                                 event->event);
 338 }
 339
 340 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 341 {
 342         ib_uverbs_async_handler(context_ptr,
 343                                 event->element.qp->uobject->user_handle,
 344                                 event->event);
 345 }
 346
 347 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 348                                     struct ib_event *event)
 349 {
 350         struct ib_uverbs_file *file =
 351                 container_of(handler, struct ib_uverbs_file, event_handler);
 352
 353         ib_uverbs_async_handler(file, event->element.port_num, event->event);
 354 }
 355
 356 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
 357                                 struct ib_uverbs_file *uverbs_file)
 358 {
 359         struct file *filp;
 360
 361         spin_lock_init(&file->lock);
 362         INIT_LIST_HEAD(&file->event_list);
 363         init_waitqueue_head(&file->poll_wait);
 364         file->uverbs_file = uverbs_file;
 365         file->async_queue = NULL;
 366
 367         file->fd = get_unused_fd();
 368         if (file->fd < 0)
 369                 return file->fd;
 370
 371         filp = get_empty_filp();
 372         if (!filp) {
 373                 put_unused_fd(file->fd);
 374                 return -ENFILE;
 375         }
 376
 377         filp->f_op         = &uverbs_event_fops;
 378         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 379         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 380         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 381         filp->f_flags      = O_RDONLY;
 382         filp->f_mode       = FMODE_READ;
 383         filp->private_data = file;
 384
 385         fd_install(file->fd, filp);
 386
 387         return 0;
 388 }
 389
 390 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 391                              size_t count, loff_t *pos)
 392 {
 393         struct ib_uverbs_file *file = filp->private_data;
 394         struct ib_uverbs_cmd_hdr hdr;
 395
 396         if (count < sizeof hdr)
 397                 return -EINVAL;
 398
 399         if (copy_from_user(&hdr, buf, sizeof hdr))
 400                 return -EFAULT;
 401
 402         if (hdr.in_words * 4 != count)
 403                 return -EINVAL;
 404
 405         if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
 406                 return -EINVAL;
 407
 408         if (!file->ucontext                               &&
 409             hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
 410             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 411                 return -EINVAL;
 412
 413         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 414                                              hdr.in_words * 4, hdr.out_words * 4);
 415 }
 416
 417 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 418 {
 419         struct ib_uverbs_file *file = filp->private_data;
 420
 421         if (!file->ucontext)
 422                 return -ENODEV;
 423         else
 424                 return file->device->ib_dev->mmap(file->ucontext, vma);
 425 }
 426
 427 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 428 {
 429         struct ib_uverbs_device *dev =
 430                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 431         struct ib_uverbs_file *file;
 432         int i = 0;
 433         int ret;
 434
 435         if (!try_module_get(dev->ib_dev->owner))
 436                 return -ENODEV;
 437
 438         file = kmalloc(sizeof *file +
 439                        (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
 440                        GFP_KERNEL);
 441         if (!file)
 442                 return -ENOMEM;
 443
 444         file->device = dev;
 445         kref_init(&file->ref);
 446
 447         file->ucontext = NULL;
 448
 449         ret = ib_uverbs_event_init(&file->async_file, file);
 450         if (ret)
 451                 goto err;
 452
 453         file->async_file.is_async = 1;
 454
 455         kref_get(&file->ref);
 456
 457         for (i = 0; i < dev->num_comp; ++i) {
 458                 ret = ib_uverbs_event_init(&file->comp_file[i], file);
 459                 if (ret)
 460                         goto err_async;
 461                 kref_get(&file->ref);
 462                 file->comp_file[i].is_async = 0;
 463         }
 464
 465
 466         filp->private_data = file;
 467
 468         INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
 469                               ib_uverbs_event_handler);
 470         if (ib_register_event_handler(&file->event_handler))
 471                 goto err_async;
 472
 473         return 0;
 474
 475 err_async:
 476         while (i--)
 477                 ib_uverbs_event_release(&file->comp_file[i]);
 478
 479         ib_uverbs_event_release(&file->async_file);
 480
 481 err:
 482         kref_put(&file->ref, ib_uverbs_release_file);
 483
 484         return ret;
 485 }
 486
 487 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 488 {
 489         struct ib_uverbs_file *file = filp->private_data;
 490         int i;
 491
 492         ib_unregister_event_handler(&file->event_handler);
 493         ib_uverbs_event_release(&file->async_file);
 494         ib_dealloc_ucontext(file->ucontext);
 495
 496         for (i = 0; i < file->device->num_comp; ++i)
 497                 ib_uverbs_event_release(&file->comp_file[i]);
 498
 499         kref_put(&file->ref, ib_uverbs_release_file);
 500
 501         return 0;
 502 }
 503
 504 static struct file_operations uverbs_fops = {
 505         .owner   = THIS_MODULE,
 506         .write   = ib_uverbs_write,
 507         .open    = ib_uverbs_open,
 508         .release = ib_uverbs_close
 509 };
 510
 511 static struct file_operations uverbs_mmap_fops = {
 512         .owner   = THIS_MODULE,
 513         .write   = ib_uverbs_write,
 514         .mmap    = ib_uverbs_mmap,
 515         .open    = ib_uverbs_open,
 516         .release = ib_uverbs_close
 517 };
 518
 519 static struct ib_client uverbs_client = {
 520         .name   = "uverbs",
 521         .add    = ib_uverbs_add_one,
 522         .remove = ib_uverbs_remove_one
 523 };
 524
 525 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 526 {
 527         struct ib_uverbs_device *dev =
 528                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 529
 530         return sprintf(buf, "%s\n", dev->ib_dev->name);
 531 }
 532 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 533
 534 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 535 {
 536         struct ib_uverbs_device *dev =
 537                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 538
 539         cdev_del(&dev->dev);
 540         clear_bit(dev->devnum, dev_map);
 541         kfree(dev);
 542 }
 543
 544 static struct class uverbs_class = {
 545         .name    = "infiniband_verbs",
 546         .release = ib_uverbs_release_class_dev
 547 };
 548
 549 static ssize_t show_abi_version(struct class *class, char *buf)
 550 {
 551         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 552 }
 553 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 554
 555 static void ib_uverbs_add_one(struct ib_device *device)
 556 {
 557         struct ib_uverbs_device *uverbs_dev;
 558
 559         if (!device->alloc_ucontext)
 560                 return;
 561
 562         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 563         if (!uverbs_dev)
 564                 return;
 565
 566         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 567
 568         spin_lock(&map_lock);
 569         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 570         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 571                 spin_unlock(&map_lock);
 572                 goto err;
 573         }
 574         set_bit(uverbs_dev->devnum, dev_map);
 575         spin_unlock(&map_lock);
 576
 577         uverbs_dev->ib_dev   = device;
 578         uverbs_dev->num_comp = 1;
 579
 580         if (device->mmap)
 581                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 582         else
 583                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 584         uverbs_dev->dev.owner = THIS_MODULE;
 585         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 586         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 587                 goto err;
 588
 589         uverbs_dev->class_dev.class = &uverbs_class;
 590         uverbs_dev->class_dev.dev   = device->dma_device;
 591         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 592         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 593         if (class_device_register(&uverbs_dev->class_dev))
 594                 goto err_cdev;
 595
 596         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 597                 goto err_class;
 598
 599         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 600
 601         return;
 602
 603 err_class:
 604         class_device_unregister(&uverbs_dev->class_dev);
 605
 606 err_cdev:
 607         cdev_del(&uverbs_dev->dev);
 608         clear_bit(uverbs_dev->devnum, dev_map);
 609
 610 err:
 611         kfree(uverbs_dev);
 612         return;
 613 }
 614
 615 static void ib_uverbs_remove_one(struct ib_device *device)
 616 {
 617         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 618
 619         if (!uverbs_dev)
 620                 return;
 621
 622         class_device_unregister(&uverbs_dev->class_dev);
 623 }
 624
 625 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 626                                                const char *dev_name, void *data)
 627 {
 628         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 629                              INFINIBANDEVENTFS_MAGIC);
 630 }
 631
 632 static struct file_system_type uverbs_event_fs = {
 633         /* No owner field so module can be unloaded */
 634         .name    = "infinibandeventfs",
 635         .get_sb  = uverbs_event_get_sb,
 636         .kill_sb = kill_litter_super
 637 };
 638
 639 static int __init ib_uverbs_init(void)
 640 {
 641         int ret;
 642
 643         spin_lock_init(&map_lock);
 644
 645         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 646                                      "infiniband_verbs");
 647         if (ret) {
 648                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 649                 goto out;
 650         }
 651
 652         ret = class_register(&uverbs_class);
 653         if (ret) {
 654                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 655                 goto out_chrdev;
 656         }
 657
 658         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 659         if (ret) {
 660                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 661                 goto out_class;
 662         }
 663
 664         ret = register_filesystem(&uverbs_event_fs);
 665         if (ret) {
 666                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 667                 goto out_class;
 668         }
 669
 670         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 671         if (IS_ERR(uverbs_event_mnt)) {
 672                 ret = PTR_ERR(uverbs_event_mnt);
 673                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 674                 goto out_fs;
 675         }
 676
 677         ret = ib_register_client(&uverbs_client);
 678         if (ret) {
 679                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 680                 goto out_mnt;
 681         }
 682
 683         return 0;
 684
 685 out_mnt:
 686         mntput(uverbs_event_mnt);
 687
 688 out_fs:
 689         unregister_filesystem(&uverbs_event_fs);
 690
 691 out_class:
 692         class_unregister(&uverbs_class);
 693
 694 out_chrdev:
 695         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 696
 697 out:
 698         return ret;
 699 }
 700
 701 static void __exit ib_uverbs_cleanup(void)
 702 {
 703         ib_unregister_client(&uverbs_client);
 704         mntput(uverbs_event_mnt);
 705         unregister_filesystem(&uverbs_event_fs);
 706         class_unregister(&uverbs_class);
 707         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 708 }
 709
 710 module_init(ib_uverbs_init);
 711 module_exit(ib_uverbs_cleanup);