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  * 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 DEFINE_IDR(ib_uverbs_srq_idr);
  73
  74 static spinlock_t map_lock;
  75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  76
  77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  78                                      const char __user *buf, int in_len,
  79                                      int out_len) = {
  80         [IB_USER_VERBS_CMD_QUERY_PARAMS]  = ib_uverbs_query_params,
  81         [IB_USER_VERBS_CMD_GET_CONTEXT]   = ib_uverbs_get_context,
  82         [IB_USER_VERBS_CMD_QUERY_DEVICE]  = ib_uverbs_query_device,
  83         [IB_USER_VERBS_CMD_QUERY_PORT]    = ib_uverbs_query_port,
  84         [IB_USER_VERBS_CMD_QUERY_GID]     = ib_uverbs_query_gid,
  85         [IB_USER_VERBS_CMD_QUERY_PKEY]    = ib_uverbs_query_pkey,
  86         [IB_USER_VERBS_CMD_ALLOC_PD]      = ib_uverbs_alloc_pd,
  87         [IB_USER_VERBS_CMD_DEALLOC_PD]    = ib_uverbs_dealloc_pd,
  88         [IB_USER_VERBS_CMD_REG_MR]        = ib_uverbs_reg_mr,
  89         [IB_USER_VERBS_CMD_DEREG_MR]      = ib_uverbs_dereg_mr,
  90         [IB_USER_VERBS_CMD_CREATE_CQ]     = ib_uverbs_create_cq,
  91         [IB_USER_VERBS_CMD_DESTROY_CQ]    = ib_uverbs_destroy_cq,
  92         [IB_USER_VERBS_CMD_CREATE_QP]     = ib_uverbs_create_qp,
  93         [IB_USER_VERBS_CMD_MODIFY_QP]     = ib_uverbs_modify_qp,
  94         [IB_USER_VERBS_CMD_DESTROY_QP]    = ib_uverbs_destroy_qp,
  95         [IB_USER_VERBS_CMD_ATTACH_MCAST]  = ib_uverbs_attach_mcast,
  96         [IB_USER_VERBS_CMD_DETACH_MCAST]  = ib_uverbs_detach_mcast,
  97         [IB_USER_VERBS_CMD_CREATE_SRQ]    = ib_uverbs_create_srq,
  98         [IB_USER_VERBS_CMD_MODIFY_SRQ]    = ib_uverbs_modify_srq,
  99         [IB_USER_VERBS_CMD_DESTROY_SRQ]   = ib_uverbs_destroy_srq,
 100 };
 101
 102 static struct vfsmount *uverbs_event_mnt;
 103
 104 static void ib_uverbs_add_one(struct ib_device *device);
 105 static void ib_uverbs_remove_one(struct ib_device *device);
 106
 107 static int ib_dealloc_ucontext(struct ib_ucontext *context)
 108 {
 109         struct ib_uobject *uobj, *tmp;
 110
 111         if (!context)
 112                 return 0;
 113
 114         down(&ib_uverbs_idr_mutex);
 115
 116         /* XXX Free AHs */
 117
 118         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 119                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 120                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 121                 ib_destroy_qp(qp);
 122                 list_del(&uobj->list);
 123                 kfree(uobj);
 124         }
 125
 126         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 127                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 128                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 129                 ib_destroy_cq(cq);
 130                 list_del(&uobj->list);
 131                 kfree(uobj);
 132         }
 133
 134         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 135                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
 136                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
 137                 ib_destroy_srq(srq);
 138                 list_del(&uobj->list);
 139                 kfree(uobj);
 140         }
 141
 142         /* XXX Free MWs */
 143
 144         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 145                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 146                 struct ib_device *mrdev = mr->device;
 147                 struct ib_umem_object *memobj;
 148
 149                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 150                 ib_dereg_mr(mr);
 151
 152                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 153                 ib_umem_release_on_close(mrdev, &memobj->umem);
 154
 155                 list_del(&uobj->list);
 156                 kfree(memobj);
 157         }
 158
 159         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 160                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 161                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 162                 ib_dealloc_pd(pd);
 163                 list_del(&uobj->list);
 164                 kfree(uobj);
 165         }
 166
 167         up(&ib_uverbs_idr_mutex);
 168
 169         return context->device->dealloc_ucontext(context);
 170 }
 171
 172 static void ib_uverbs_release_file(struct kref *ref)
 173 {
 174         struct ib_uverbs_file *file =
 175                 container_of(ref, struct ib_uverbs_file, ref);
 176
 177         module_put(file->device->ib_dev->owner);
 178         kfree(file);
 179 }
 180
 181 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 182                                     size_t count, loff_t *pos)
 183 {
 184         struct ib_uverbs_event_file *file = filp->private_data;
 185         void *event;
 186         int eventsz;
 187         int ret = 0;
 188
 189         spin_lock_irq(&file->lock);
 190
 191         while (list_empty(&file->event_list) && file->fd >= 0) {
 192                 spin_unlock_irq(&file->lock);
 193
 194                 if (filp->f_flags & O_NONBLOCK)
 195                         return -EAGAIN;
 196
 197                 if (wait_event_interruptible(file->poll_wait,
 198                                              !list_empty(&file->event_list) ||
 199                                              file->fd < 0))
 200                         return -ERESTARTSYS;
 201
 202                 spin_lock_irq(&file->lock);
 203         }
 204
 205         if (file->fd < 0) {
 206                 spin_unlock_irq(&file->lock);
 207                 return -ENODEV;
 208         }
 209
 210         if (file->is_async) {
 211                 event   = list_entry(file->event_list.next,
 212                                      struct ib_uverbs_async_event, list);
 213                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 214         } else {
 215                 event   = list_entry(file->event_list.next,
 216                                      struct ib_uverbs_comp_event, list);
 217                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 218         }
 219
 220         if (eventsz > count) {
 221                 ret   = -EINVAL;
 222                 event = NULL;
 223         } else
 224                 list_del(file->event_list.next);
 225
 226         spin_unlock_irq(&file->lock);
 227
 228         if (event) {
 229                 if (copy_to_user(buf, event, eventsz))
 230                         ret = -EFAULT;
 231                 else
 232                         ret = eventsz;
 233         }
 234
 235         kfree(event);
 236
 237         return ret;
 238 }
 239
 240 static unsigned int ib_uverbs_event_poll(struct file *filp,
 241                                          struct poll_table_struct *wait)
 242 {
 243         unsigned int pollflags = 0;
 244         struct ib_uverbs_event_file *file = filp->private_data;
 245
 246         poll_wait(filp, &file->poll_wait, wait);
 247
 248         spin_lock_irq(&file->lock);
 249         if (file->fd < 0)
 250                 pollflags = POLLERR;
 251         else if (!list_empty(&file->event_list))
 252                 pollflags = POLLIN | POLLRDNORM;
 253         spin_unlock_irq(&file->lock);
 254
 255         return pollflags;
 256 }
 257
 258 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
 259 {
 260         struct list_head *entry, *tmp;
 261
 262         spin_lock_irq(&file->lock);
 263         if (file->fd != -1) {
 264                 file->fd = -1;
 265                 list_for_each_safe(entry, tmp, &file->event_list)
 266                         if (file->is_async)
 267                                 kfree(list_entry(entry, struct ib_uverbs_async_event, list));
 268                         else
 269                                 kfree(list_entry(entry, struct ib_uverbs_comp_event, list));
 270         }
 271         spin_unlock_irq(&file->lock);
 272 }
 273
 274 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 275 {
 276         struct ib_uverbs_event_file *file = filp->private_data;
 277
 278         return fasync_helper(fd, filp, on, &file->async_queue);
 279 }
 280
 281 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 282 {
 283         struct ib_uverbs_event_file *file = filp->private_data;
 284
 285         ib_uverbs_event_release(file);
 286         ib_uverbs_event_fasync(-1, filp, 0);
 287         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 288
 289         return 0;
 290 }
 291
 292 static struct file_operations uverbs_event_fops = {
 293         /*
 294          * No .owner field since we artificially create event files,
 295          * so there is no increment to the module reference count in
 296          * the open path.  All event files come from a uverbs command
 297          * file, which already takes a module reference, so this is OK.
 298          */
 299         .read    = ib_uverbs_event_read,
 300         .poll    = ib_uverbs_event_poll,
 301         .release = ib_uverbs_event_close,
 302         .fasync  = ib_uverbs_event_fasync
 303 };
 304
 305 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 306 {
 307         struct ib_uverbs_file       *file = cq_context;
 308         struct ib_uverbs_comp_event *entry;
 309         unsigned long                flags;
 310
 311         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 312         if (!entry)
 313                 return;
 314
 315         entry->desc.cq_handle = cq->uobject->user_handle;
 316
 317         spin_lock_irqsave(&file->comp_file[0].lock, flags);
 318         list_add_tail(&entry->list, &file->comp_file[0].event_list);
 319         spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
 320
 321         wake_up_interruptible(&file->comp_file[0].poll_wait);
 322         kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
 323 }
 324
 325 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 326                                     __u64 element, __u64 event)
 327 {
 328         struct ib_uverbs_async_event *entry;
 329         unsigned long flags;
 330
 331         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 332         if (!entry)
 333                 return;
 334
 335         entry->desc.element    = element;
 336         entry->desc.event_type = event;
 337
 338         spin_lock_irqsave(&file->async_file.lock, flags);
 339         list_add_tail(&entry->list, &file->async_file.event_list);
 340         spin_unlock_irqrestore(&file->async_file.lock, flags);
 341
 342         wake_up_interruptible(&file->async_file.poll_wait);
 343         kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
 344 }
 345
 346 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 347 {
 348         ib_uverbs_async_handler(context_ptr,
 349                                 event->element.cq->uobject->user_handle,
 350                                 event->event);
 351 }
 352
 353 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 354 {
 355         ib_uverbs_async_handler(context_ptr,
 356                                 event->element.qp->uobject->user_handle,
 357                                 event->event);
 358 }
 359
 360 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 361 {
 362         ib_uverbs_async_handler(context_ptr,
 363                                 event->element.srq->uobject->user_handle,
 364                                 event->event);
 365 }
 366
 367 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 368                                     struct ib_event *event)
 369 {
 370         struct ib_uverbs_file *file =
 371                 container_of(handler, struct ib_uverbs_file, event_handler);
 372
 373         ib_uverbs_async_handler(file, event->element.port_num, event->event);
 374 }
 375
 376 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
 377                                 struct ib_uverbs_file *uverbs_file)
 378 {
 379         struct file *filp;
 380
 381         spin_lock_init(&file->lock);
 382         INIT_LIST_HEAD(&file->event_list);
 383         init_waitqueue_head(&file->poll_wait);
 384         file->uverbs_file = uverbs_file;
 385         file->async_queue = NULL;
 386
 387         file->fd = get_unused_fd();
 388         if (file->fd < 0)
 389                 return file->fd;
 390
 391         filp = get_empty_filp();
 392         if (!filp) {
 393                 put_unused_fd(file->fd);
 394                 return -ENFILE;
 395         }
 396
 397         filp->f_op         = &uverbs_event_fops;
 398         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 399         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 400         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 401         filp->f_flags      = O_RDONLY;
 402         filp->f_mode       = FMODE_READ;
 403         filp->private_data = file;
 404
 405         fd_install(file->fd, filp);
 406
 407         return 0;
 408 }
 409
 410 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 411                              size_t count, loff_t *pos)
 412 {
 413         struct ib_uverbs_file *file = filp->private_data;
 414         struct ib_uverbs_cmd_hdr hdr;
 415
 416         if (count < sizeof hdr)
 417                 return -EINVAL;
 418
 419         if (copy_from_user(&hdr, buf, sizeof hdr))
 420                 return -EFAULT;
 421
 422         if (hdr.in_words * 4 != count)
 423                 return -EINVAL;
 424
 425         if (hdr.command < 0 || hdr.command >= ARRAY_SIZE(uverbs_cmd_table))
 426                 return -EINVAL;
 427
 428         if (!file->ucontext                               &&
 429             hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
 430             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 431                 return -EINVAL;
 432
 433         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 434                                              hdr.in_words * 4, hdr.out_words * 4);
 435 }
 436
 437 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 438 {
 439         struct ib_uverbs_file *file = filp->private_data;
 440
 441         if (!file->ucontext)
 442                 return -ENODEV;
 443         else
 444                 return file->device->ib_dev->mmap(file->ucontext, vma);
 445 }
 446
 447 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 448 {
 449         struct ib_uverbs_device *dev =
 450                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 451         struct ib_uverbs_file *file;
 452         int i = 0;
 453         int ret;
 454
 455         if (!try_module_get(dev->ib_dev->owner))
 456                 return -ENODEV;
 457
 458         file = kmalloc(sizeof *file +
 459                        (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
 460                        GFP_KERNEL);
 461         if (!file)
 462                 return -ENOMEM;
 463
 464         file->device = dev;
 465         kref_init(&file->ref);
 466
 467         file->ucontext = NULL;
 468
 469         ret = ib_uverbs_event_init(&file->async_file, file);
 470         if (ret)
 471                 goto err;
 472
 473         file->async_file.is_async = 1;
 474
 475         kref_get(&file->ref);
 476
 477         for (i = 0; i < dev->num_comp; ++i) {
 478                 ret = ib_uverbs_event_init(&file->comp_file[i], file);
 479                 if (ret)
 480                         goto err_async;
 481                 kref_get(&file->ref);
 482                 file->comp_file[i].is_async = 0;
 483         }
 484
 485
 486         filp->private_data = file;
 487
 488         INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
 489                               ib_uverbs_event_handler);
 490         if (ib_register_event_handler(&file->event_handler))
 491                 goto err_async;
 492
 493         return 0;
 494
 495 err_async:
 496         while (i--)
 497                 ib_uverbs_event_release(&file->comp_file[i]);
 498
 499         ib_uverbs_event_release(&file->async_file);
 500
 501 err:
 502         kref_put(&file->ref, ib_uverbs_release_file);
 503
 504         return ret;
 505 }
 506
 507 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 508 {
 509         struct ib_uverbs_file *file = filp->private_data;
 510         int i;
 511
 512         ib_unregister_event_handler(&file->event_handler);
 513         ib_uverbs_event_release(&file->async_file);
 514         ib_dealloc_ucontext(file->ucontext);
 515
 516         for (i = 0; i < file->device->num_comp; ++i)
 517                 ib_uverbs_event_release(&file->comp_file[i]);
 518
 519         kref_put(&file->ref, ib_uverbs_release_file);
 520
 521         return 0;
 522 }
 523
 524 static struct file_operations uverbs_fops = {
 525         .owner   = THIS_MODULE,
 526         .write   = ib_uverbs_write,
 527         .open    = ib_uverbs_open,
 528         .release = ib_uverbs_close
 529 };
 530
 531 static struct file_operations uverbs_mmap_fops = {
 532         .owner   = THIS_MODULE,
 533         .write   = ib_uverbs_write,
 534         .mmap    = ib_uverbs_mmap,
 535         .open    = ib_uverbs_open,
 536         .release = ib_uverbs_close
 537 };
 538
 539 static struct ib_client uverbs_client = {
 540         .name   = "uverbs",
 541         .add    = ib_uverbs_add_one,
 542         .remove = ib_uverbs_remove_one
 543 };
 544
 545 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 546 {
 547         struct ib_uverbs_device *dev =
 548                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 549
 550         return sprintf(buf, "%s\n", dev->ib_dev->name);
 551 }
 552 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 553
 554 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 555 {
 556         struct ib_uverbs_device *dev =
 557                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 558
 559         cdev_del(&dev->dev);
 560         clear_bit(dev->devnum, dev_map);
 561         kfree(dev);
 562 }
 563
 564 static struct class uverbs_class = {
 565         .name    = "infiniband_verbs",
 566         .release = ib_uverbs_release_class_dev
 567 };
 568
 569 static ssize_t show_abi_version(struct class *class, char *buf)
 570 {
 571         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 572 }
 573 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 574
 575 static void ib_uverbs_add_one(struct ib_device *device)
 576 {
 577         struct ib_uverbs_device *uverbs_dev;
 578
 579         if (!device->alloc_ucontext)
 580                 return;
 581
 582         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 583         if (!uverbs_dev)
 584                 return;
 585
 586         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 587
 588         spin_lock(&map_lock);
 589         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 590         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 591                 spin_unlock(&map_lock);
 592                 goto err;
 593         }
 594         set_bit(uverbs_dev->devnum, dev_map);
 595         spin_unlock(&map_lock);
 596
 597         uverbs_dev->ib_dev   = device;
 598         uverbs_dev->num_comp = 1;
 599
 600         if (device->mmap)
 601                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 602         else
 603                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 604         uverbs_dev->dev.owner = THIS_MODULE;
 605         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 606         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 607                 goto err;
 608
 609         uverbs_dev->class_dev.class = &uverbs_class;
 610         uverbs_dev->class_dev.dev   = device->dma_device;
 611         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 612         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 613         if (class_device_register(&uverbs_dev->class_dev))
 614                 goto err_cdev;
 615
 616         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 617                 goto err_class;
 618
 619         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 620
 621         return;
 622
 623 err_class:
 624         class_device_unregister(&uverbs_dev->class_dev);
 625
 626 err_cdev:
 627         cdev_del(&uverbs_dev->dev);
 628         clear_bit(uverbs_dev->devnum, dev_map);
 629
 630 err:
 631         kfree(uverbs_dev);
 632         return;
 633 }
 634
 635 static void ib_uverbs_remove_one(struct ib_device *device)
 636 {
 637         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 638
 639         if (!uverbs_dev)
 640                 return;
 641
 642         class_device_unregister(&uverbs_dev->class_dev);
 643 }
 644
 645 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 646                                                const char *dev_name, void *data)
 647 {
 648         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 649                              INFINIBANDEVENTFS_MAGIC);
 650 }
 651
 652 static struct file_system_type uverbs_event_fs = {
 653         /* No owner field so module can be unloaded */
 654         .name    = "infinibandeventfs",
 655         .get_sb  = uverbs_event_get_sb,
 656         .kill_sb = kill_litter_super
 657 };
 658
 659 static int __init ib_uverbs_init(void)
 660 {
 661         int ret;
 662
 663         spin_lock_init(&map_lock);
 664
 665         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 666                                      "infiniband_verbs");
 667         if (ret) {
 668                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 669                 goto out;
 670         }
 671
 672         ret = class_register(&uverbs_class);
 673         if (ret) {
 674                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 675                 goto out_chrdev;
 676         }
 677
 678         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 679         if (ret) {
 680                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 681                 goto out_class;
 682         }
 683
 684         ret = register_filesystem(&uverbs_event_fs);
 685         if (ret) {
 686                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 687                 goto out_class;
 688         }
 689
 690         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 691         if (IS_ERR(uverbs_event_mnt)) {
 692                 ret = PTR_ERR(uverbs_event_mnt);
 693                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 694                 goto out_fs;
 695         }
 696
 697         ret = ib_register_client(&uverbs_client);
 698         if (ret) {
 699                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 700                 goto out_mnt;
 701         }
 702
 703         return 0;
 704
 705 out_mnt:
 706         mntput(uverbs_event_mnt);
 707
 708 out_fs:
 709         unregister_filesystem(&uverbs_event_fs);
 710
 711 out_class:
 712         class_unregister(&uverbs_class);
 713
 714 out_chrdev:
 715         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 716
 717 out:
 718         return ret;
 719 }
 720
 721 static void __exit ib_uverbs_cleanup(void)
 722 {
 723         ib_unregister_client(&uverbs_client);
 724         mntput(uverbs_event_mnt);
 725         unregister_filesystem(&uverbs_event_fs);
 726         class_unregister(&uverbs_class);
 727         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 728 }
 729
 730 module_init(ib_uverbs_init);
 731 module_exit(ib_uverbs_cleanup);