summaryrefslogtreecommitdiff
path: root/drivers/infiniband/core/uverbs_main.c
blob: 12511808de212673ebb5a1f6173b0f3b40155cbe (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
/*
 * Copyright (c) 2005 Topspin Communications.  All rights reserved.
 * Copyright (c) 2005 Cisco Systems.  All rights reserved.
 * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
 * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
 *
 * This software is available to you under a choice of one of two
 * licenses.  You may choose to be licensed under the terms of the GNU
 * General Public License (GPL) Version 2, available from the file
 * COPYING in the main directory of this source tree, or the
 * OpenIB.org BSD license below:
 *
 *     Redistribution and use in source and binary forms, with or
 *     without modification, are permitted provided that the following
 *     conditions are met:
 *
 *      - Redistributions of source code must retain the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer.
 *
 *      - Redistributions in binary form must reproduce the above
 *        copyright notice, this list of conditions and the following
 *        disclaimer in the documentation and/or other materials
 *        provided with the distribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
 */

#include <linux/module.h>
#include <linux/init.h>
#include <linux/device.h>
#include <linux/err.h>
#include <linux/fs.h>
#include <linux/poll.h>
#include <linux/file.h>
#include <linux/mount.h>

#include <asm/uaccess.h>

#include "uverbs.h"

MODULE_AUTHOR("Roland Dreier");
MODULE_DESCRIPTION("InfiniBand userspace verbs access");
MODULE_LICENSE("Dual BSD/GPL");

#define INFINIBANDEVENTFS_MAGIC	0x49426576	/* "IBev" */

enum {
	IB_UVERBS_MAJOR       = 231,
	IB_UVERBS_BASE_MINOR  = 192,
	IB_UVERBS_MAX_DEVICES = 32
};

#define IB_UVERBS_BASE_DEV	MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)

DECLARE_MUTEX(ib_uverbs_idr_mutex);
DEFINE_IDR(ib_uverbs_pd_idr);
DEFINE_IDR(ib_uverbs_mr_idr);
DEFINE_IDR(ib_uverbs_mw_idr);
DEFINE_IDR(ib_uverbs_ah_idr);
DEFINE_IDR(ib_uverbs_cq_idr);
DEFINE_IDR(ib_uverbs_qp_idr);
DEFINE_IDR(ib_uverbs_srq_idr);

static spinlock_t map_lock;
static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);

static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
				     const char __user *buf, int in_len,
				     int out_len) = {
	[IB_USER_VERBS_CMD_QUERY_PARAMS]  = ib_uverbs_query_params,
	[IB_USER_VERBS_CMD_GET_CONTEXT]   = ib_uverbs_get_context,
	[IB_USER_VERBS_CMD_QUERY_DEVICE]  = ib_uverbs_query_device,
	[IB_USER_VERBS_CMD_QUERY_PORT]    = ib_uverbs_query_port,
	[IB_USER_VERBS_CMD_QUERY_GID]     = ib_uverbs_query_gid,
	[IB_USER_VERBS_CMD_QUERY_PKEY]    = ib_uverbs_query_pkey,
	[IB_USER_VERBS_CMD_ALLOC_PD]      = ib_uverbs_alloc_pd,
	[IB_USER_VERBS_CMD_DEALLOC_PD]    = ib_uverbs_dealloc_pd,
	[IB_USER_VERBS_CMD_REG_MR]        = ib_uverbs_reg_mr,
	[IB_USER_VERBS_CMD_DEREG_MR]      = ib_uverbs_dereg_mr,
	[IB_USER_VERBS_CMD_CREATE_CQ]     = ib_uverbs_create_cq,
	[IB_USER_VERBS_CMD_DESTROY_CQ]    = ib_uverbs_destroy_cq,
	[IB_USER_VERBS_CMD_CREATE_QP]     = ib_uverbs_create_qp,
	[IB_USER_VERBS_CMD_MODIFY_QP]     = ib_uverbs_modify_qp,
	[IB_USER_VERBS_CMD_DESTROY_QP]    = ib_uverbs_destroy_qp,
	[IB_USER_VERBS_CMD_ATTACH_MCAST]  = ib_uverbs_attach_mcast,
	[IB_USER_VERBS_CMD_DETACH_MCAST]  = ib_uverbs_detach_mcast,
	[IB_USER_VERBS_CMD_CREATE_SRQ]    = ib_uverbs_create_srq,
	[IB_USER_VERBS_CMD_MODIFY_SRQ]    = ib_uverbs_modify_srq,
	[IB_USER_VERBS_CMD_DESTROY_SRQ]   = ib_uverbs_destroy_srq,
};

static struct vfsmount *uverbs_event_mnt;

static void ib_uverbs_add_one(struct ib_device *device);
static void ib_uverbs_remove_one(struct ib_device *device);

static int ib_dealloc_ucontext(struct ib_ucontext *context)
{
	struct ib_uobject *uobj, *tmp;

	if (!context)
		return 0;

	down(&ib_uverbs_idr_mutex);

	/* XXX Free AHs */

	list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
		struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
		idr_remove(&ib_uverbs_qp_idr, uobj->id);
		ib_destroy_qp(qp);
		list_del(&uobj->list);
		kfree(container_of(uobj, struct ib_uevent_object, uobject));
	}

	list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
		struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
		idr_remove(&ib_uverbs_cq_idr, uobj->id);
		ib_destroy_cq(cq);
		list_del(&uobj->list);
		kfree(container_of(uobj, struct ib_ucq_object, uobject));
	}

	list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
		struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
		idr_remove(&ib_uverbs_srq_idr, uobj->id);
		ib_destroy_srq(srq);
		list_del(&uobj->list);
		kfree(container_of(uobj, struct ib_uevent_object, uobject));
	}

	/* XXX Free MWs */

	list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
		struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
		struct ib_device *mrdev = mr->device;
		struct ib_umem_object *memobj;

		idr_remove(&ib_uverbs_mr_idr, uobj->id);
		ib_dereg_mr(mr);

		memobj = container_of(uobj, struct ib_umem_object, uobject);
		ib_umem_release_on_close(mrdev, &memobj->umem);

		list_del(&uobj->list);
		kfree(memobj);
	}

	list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
		struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
		idr_remove(&ib_uverbs_pd_idr, uobj->id);
		ib_dealloc_pd(pd);
		list_del(&uobj->list);
		kfree(uobj);
	}

	up(&ib_uverbs_idr_mutex);

	return context->device->dealloc_ucontext(context);
}

static void ib_uverbs_release_file(struct kref *ref)
{
	struct ib_uverbs_file *file =
		container_of(ref, struct ib_uverbs_file, ref);

	module_put(file->device->ib_dev->owner);
	kfree(file);
}

static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
				    size_t count, loff_t *pos)
{
	struct ib_uverbs_event_file *file = filp->private_data;
	struct ib_uverbs_event *event;
	int eventsz;
	int ret = 0;

	spin_lock_irq(&file->lock);

	while (list_empty(&file->event_list) && file->fd >= 0) {
		spin_unlock_irq(&file->lock);

		if (filp->f_flags & O_NONBLOCK)
			return -EAGAIN;

		if (wait_event_interruptible(file->poll_wait,
					     !list_empty(&file->event_list) ||
					     file->fd < 0))
			return -ERESTARTSYS;

		spin_lock_irq(&file->lock);
	}

	if (file->fd < 0) {
		spin_unlock_irq(&file->lock);
		return -ENODEV;
	}

	event = list_entry(file->event_list.next, struct ib_uverbs_event, list);

	if (file->is_async)
		eventsz = sizeof (struct ib_uverbs_async_event_desc);
	else
		eventsz = sizeof (struct ib_uverbs_comp_event_desc);

	if (eventsz > count) {
		ret   = -EINVAL;
		event = NULL;
	} else {
		list_del(file->event_list.next);
		if (event->counter) {
			++(*event->counter);
			list_del(&event->obj_list);
		}
	}

	spin_unlock_irq(&file->lock);

	if (event) {
		if (copy_to_user(buf, event, eventsz))
			ret = -EFAULT;
		else
			ret = eventsz;
	}

	kfree(event);

	return ret;
}

static unsigned int ib_uverbs_event_poll(struct file *filp,
					 struct poll_table_struct *wait)
{
	unsigned int pollflags = 0;
	struct ib_uverbs_event_file *file = filp->private_data;

	poll_wait(filp, &file->poll_wait, wait);

	spin_lock_irq(&file->lock);
	if (file->fd < 0)
		pollflags = POLLERR;
	else if (!list_empty(&file->event_list))
		pollflags = POLLIN | POLLRDNORM;
	spin_unlock_irq(&file->lock);

	return pollflags;
}

static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
{
	struct ib_uverbs_event *entry, *tmp;

	spin_lock_irq(&file->lock);
	if (file->fd != -1) {
		file->fd = -1;
		list_for_each_entry_safe(entry, tmp, &file->event_list, list)
			kfree(entry);
	}
	spin_unlock_irq(&file->lock);
}

static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
{
	struct ib_uverbs_event_file *file = filp->private_data;

	return fasync_helper(fd, filp, on, &file->async_queue);
}

static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
{
	struct ib_uverbs_event_file *file = filp->private_data;

	ib_uverbs_event_release(file);
	ib_uverbs_event_fasync(-1, filp, 0);
	kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);

	return 0;
}

static struct file_operations uverbs_event_fops = {
	/*
	 * No .owner field since we artificially create event files,
	 * so there is no increment to the module reference count in
	 * the open path.  All event files come from a uverbs command
	 * file, which already takes a module reference, so this is OK.
	 */
	.read 	 = ib_uverbs_event_read,
	.poll    = ib_uverbs_event_poll,
	.release = ib_uverbs_event_close,
	.fasync  = ib_uverbs_event_fasync
};

void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
{
	struct ib_uverbs_file  *file = cq_context;
	struct ib_ucq_object   *uobj;
	struct ib_uverbs_event *entry;
	unsigned long           flags;

	entry = kmalloc(sizeof *entry, GFP_ATOMIC);
	if (!entry)
		return;

	uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);

	entry->desc.comp.cq_handle = cq->uobject->user_handle;
	entry->counter		   = &uobj->comp_events_reported;

	spin_lock_irqsave(&file->comp_file[0].lock, flags);
	list_add_tail(&entry->list, &file->comp_file[0].event_list);
	list_add_tail(&entry->obj_list, &uobj->comp_list);
	spin_unlock_irqrestore(&file->comp_file[0].lock, flags);

	wake_up_interruptible(&file->comp_file[0].poll_wait);
	kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
}

static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
				    __u64 element, __u64 event,
				    struct list_head *obj_list,
				    u32 *counter)
{
	struct ib_uverbs_event *entry;
	unsigned long flags;

	entry = kmalloc(sizeof *entry, GFP_ATOMIC);
	if (!entry)
		return;

	entry->desc.async.element    = element;
	entry->desc.async.event_type = event;
	entry->counter               = counter;

	spin_lock_irqsave(&file->async_file.lock, flags);
	list_add_tail(&entry->list, &file->async_file.event_list);
	if (obj_list)
		list_add_tail(&entry->obj_list, obj_list);
	spin_unlock_irqrestore(&file->async_file.lock, flags);

	wake_up_interruptible(&file->async_file.poll_wait);
	kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
}

void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
{
	struct ib_ucq_object *uobj;

	uobj = container_of(event->element.cq->uobject,
			    struct ib_ucq_object, uobject);

	ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
				event->event, &uobj->async_list,
				&uobj->async_events_reported);
				
}

void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
{
	struct ib_uevent_object *uobj;

	uobj = container_of(event->element.qp->uobject,
			    struct ib_uevent_object, uobject);

	ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
				event->event, &uobj->event_list,
				&uobj->events_reported);
}

void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
{
	struct ib_uevent_object *uobj;

	uobj = container_of(event->element.srq->uobject,
			    struct ib_uevent_object, uobject);

	ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
				event->event, &uobj->event_list,
				&uobj->events_reported);
}

static void ib_uverbs_event_handler(struct ib_event_handler *handler,
				    struct ib_event *event)
{
	struct ib_uverbs_file *file =
		container_of(handler, struct ib_uverbs_file, event_handler);

	ib_uverbs_async_handler(file, event->element.port_num, event->event,
				NULL, NULL);
}

static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
				struct ib_uverbs_file *uverbs_file)
{
	struct file *filp;

	spin_lock_init(&file->lock);
	INIT_LIST_HEAD(&file->event_list);
	init_waitqueue_head(&file->poll_wait);
	file->uverbs_file = uverbs_file;
	file->async_queue = NULL;

	file->fd = get_unused_fd();
	if (file->fd < 0)
		return file->fd;

	filp = get_empty_filp();
	if (!filp) {
		put_unused_fd(file->fd);
		return -ENFILE;
	}

	filp->f_op 	   = &uverbs_event_fops;
	filp->f_vfsmnt 	   = mntget(uverbs_event_mnt);
	filp->f_dentry 	   = dget(uverbs_event_mnt->mnt_root);
	filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
	filp->f_flags      = O_RDONLY;
	filp->f_mode       = FMODE_READ;
	filp->private_data = file;

	fd_install(file->fd, filp);

	return 0;
}

static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
			     size_t count, loff_t *pos)
{
	struct ib_uverbs_file *file = filp->private_data;
	struct ib_uverbs_cmd_hdr hdr;

	if (count < sizeof hdr)
		return -EINVAL;

	if (copy_from_user(&hdr, buf, sizeof hdr))
		return -EFAULT;

	if (hdr.in_words * 4 != count)
		return -EINVAL;

	if (hdr.command < 0				||
	    hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
	    !uverbs_cmd_table[hdr.command])
		return -EINVAL;

	if (!file->ucontext                               &&
	    hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
	    hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
		return -EINVAL;

	return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
					     hdr.in_words * 4, hdr.out_words * 4);
}

static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
{
	struct ib_uverbs_file *file = filp->private_data;

	if (!file->ucontext)
		return -ENODEV;
	else
		return file->device->ib_dev->mmap(file->ucontext, vma);
}

static int ib_uverbs_open(struct inode *inode, struct file *filp)
{
	struct ib_uverbs_device *dev =
		container_of(inode->i_cdev, struct ib_uverbs_device, dev);
	struct ib_uverbs_file *file;
	int i = 0;
	int ret;

	if (!try_module_get(dev->ib_dev->owner))
		return -ENODEV;

	file = kmalloc(sizeof *file +
		       (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
		       GFP_KERNEL);
	if (!file) {
		ret = -ENOMEM;
		goto err;
	}

	file->device = dev;
	kref_init(&file->ref);
	init_MUTEX(&file->mutex);

	file->ucontext = NULL;

	kref_get(&file->ref);
	ret = ib_uverbs_event_init(&file->async_file, file);
	if (ret)
		goto err_kref;

	file->async_file.is_async = 1;

	for (i = 0; i < dev->num_comp; ++i) {
		kref_get(&file->ref);
		ret = ib_uverbs_event_init(&file->comp_file[i], file);
		if (ret)
			goto err_async;
		file->comp_file[i].is_async = 0;
	}


	filp->private_data = file;

	INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
			      ib_uverbs_event_handler);
	if (ib_register_event_handler(&file->event_handler))
		goto err_async;

	return 0;

err_async:
	while (i--)
		ib_uverbs_event_release(&file->comp_file[i]);

	ib_uverbs_event_release(&file->async_file);

err_kref:
	/*
	 * One extra kref_put() because we took a reference before the
	 * event file creation that failed and got us here.
	 */
	kref_put(&file->ref, ib_uverbs_release_file);
	kref_put(&file->ref, ib_uverbs_release_file);

err:
	module_put(dev->ib_dev->owner);
	return ret;
}

static int ib_uverbs_close(struct inode *inode, struct file *filp)
{
	struct ib_uverbs_file *file = filp->private_data;
	int i;

	ib_unregister_event_handler(&file->event_handler);
	ib_uverbs_event_release(&file->async_file);
	ib_dealloc_ucontext(file->ucontext);

	for (i = 0; i < file->device->num_comp; ++i)
		ib_uverbs_event_release(&file->comp_file[i]);

	kref_put(&file->ref, ib_uverbs_release_file);

	return 0;
}

static struct file_operations uverbs_fops = {
	.owner 	 = THIS_MODULE,
	.write 	 = ib_uverbs_write,
	.open 	 = ib_uverbs_open,
	.release = ib_uverbs_close
};

static struct file_operations uverbs_mmap_fops = {
	.owner 	 = THIS_MODULE,
	.write 	 = ib_uverbs_write,
	.mmap    = ib_uverbs_mmap,
	.open 	 = ib_uverbs_open,
	.release = ib_uverbs_close
};

static struct ib_client uverbs_client = {
	.name   = "uverbs",
	.add    = ib_uverbs_add_one,
	.remove = ib_uverbs_remove_one
};

static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
{
	struct ib_uverbs_device *dev =
		container_of(class_dev, struct ib_uverbs_device, class_dev);

	return sprintf(buf, "%s\n", dev->ib_dev->name);
}
static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);

static void ib_uverbs_release_class_dev(struct class_device *class_dev)
{
	struct ib_uverbs_device *dev =
		container_of(class_dev, struct ib_uverbs_device, class_dev);

	cdev_del(&dev->dev);
	clear_bit(dev->devnum, dev_map);
	kfree(dev);
}

static struct class uverbs_class = {
	.name    = "infiniband_verbs",
	.release = ib_uverbs_release_class_dev
};

static ssize_t show_abi_version(struct class *class, char *buf)
{
	return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
}
static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);

static void ib_uverbs_add_one(struct ib_device *device)
{
	struct ib_uverbs_device *uverbs_dev;

	if (!device->alloc_ucontext)
		return;

	uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
	if (!uverbs_dev)
		return;

	memset(uverbs_dev, 0, sizeof *uverbs_dev);

	spin_lock(&map_lock);
	uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
	if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
		spin_unlock(&map_lock);
		goto err;
	}
	set_bit(uverbs_dev->devnum, dev_map);
	spin_unlock(&map_lock);

	uverbs_dev->ib_dev   = device;
	uverbs_dev->num_comp = 1;

	if (device->mmap)
		cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
	else
		cdev_init(&uverbs_dev->dev, &uverbs_fops);
	uverbs_dev->dev.owner = THIS_MODULE;
	kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
	if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
		goto err;

	uverbs_dev->class_dev.class = &uverbs_class;
	uverbs_dev->class_dev.dev   = device->dma_device;
	uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
	snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
	if (class_device_register(&uverbs_dev->class_dev))
		goto err_cdev;

	if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
		goto err_class;

	ib_set_client_data(device, &uverbs_client, uverbs_dev);

	return;

err_class:
	class_device_unregister(&uverbs_dev->class_dev);

err_cdev:
	cdev_del(&uverbs_dev->dev);
	clear_bit(uverbs_dev->devnum, dev_map);

err:
	kfree(uverbs_dev);
	return;
}

static void ib_uverbs_remove_one(struct ib_device *device)
{
	struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);

	if (!uverbs_dev)
		return;

	class_device_unregister(&uverbs_dev->class_dev);
}

static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
					       const char *dev_name, void *data)
{
	return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
			     INFINIBANDEVENTFS_MAGIC);
}

static struct file_system_type uverbs_event_fs = {
	/* No owner field so module can be unloaded */
	.name    = "infinibandeventfs",
	.get_sb  = uverbs_event_get_sb,
	.kill_sb = kill_litter_super
};

static int __init ib_uverbs_init(void)
{
	int ret;

	spin_lock_init(&map_lock);

	ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
				     "infiniband_verbs");
	if (ret) {
		printk(KERN_ERR "user_verbs: couldn't register device number\n");
		goto out;
	}

	ret = class_register(&uverbs_class);
	if (ret) {
		printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
		goto out_chrdev;
	}

	ret = class_create_file(&uverbs_class, &class_attr_abi_version);
	if (ret) {
		printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
		goto out_class;
	}

	ret = register_filesystem(&uverbs_event_fs);
	if (ret) {
		printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
		goto out_class;
	}

	uverbs_event_mnt = kern_mount(&uverbs_event_fs);
	if (IS_ERR(uverbs_event_mnt)) {
		ret = PTR_ERR(uverbs_event_mnt);
		printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
		goto out_fs;
	}

	ret = ib_register_client(&uverbs_client);
	if (ret) {
		printk(KERN_ERR "user_verbs: couldn't register client\n");
		goto out_mnt;
	}

	return 0;

out_mnt:
	mntput(uverbs_event_mnt);

out_fs:
	unregister_filesystem(&uverbs_event_fs);

out_class:
	class_unregister(&uverbs_class);

out_chrdev:
	unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);

out:
	return ret;
}

static void __exit ib_uverbs_cleanup(void)
{
	ib_unregister_client(&uverbs_client);
	mntput(uverbs_event_mnt);
	unregister_filesystem(&uverbs_event_fs);
	class_unregister(&uverbs_class);
	unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
}

module_init(ib_uverbs_init);
module_exit(ib_uverbs_cleanup);