[PATCH] IB: Update MAD client API
[linux-2.6] / 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);