IB/uverbs: Use anon_inodes instead of private infinibandeventfs
[linux-3.10.git] / drivers / infiniband / core / uverbs_main.c
1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7  *
8  * This software is available to you under a choice of one of two
9  * licenses.  You may choose to be licensed under the terms of the GNU
10  * General Public License (GPL) Version 2, available from the file
11  * COPYING in the main directory of this source tree, or the
12  * OpenIB.org BSD license below:
13  *
14  *     Redistribution and use in source and binary forms, with or
15  *     without modification, are permitted provided that the following
16  *     conditions are met:
17  *
18  *      - Redistributions of source code must retain the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer.
21  *
22  *      - Redistributions in binary form must reproduce the above
23  *        copyright notice, this list of conditions and the following
24  *        disclaimer in the documentation and/or other materials
25  *        provided with the distribution.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34  * SOFTWARE.
35  */
36
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/device.h>
40 #include <linux/err.h>
41 #include <linux/fs.h>
42 #include <linux/poll.h>
43 #include <linux/sched.h>
44 #include <linux/file.h>
45 #include <linux/cdev.h>
46 #include <linux/anon_inodes.h>
47
48 #include <asm/uaccess.h>
49
50 #include "uverbs.h"
51
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 enum {
57         IB_UVERBS_MAJOR       = 231,
58         IB_UVERBS_BASE_MINOR  = 192,
59         IB_UVERBS_MAX_DEVICES = 32
60 };
61
62 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
63
64 static struct class *uverbs_class;
65
66 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
67 DEFINE_IDR(ib_uverbs_pd_idr);
68 DEFINE_IDR(ib_uverbs_mr_idr);
69 DEFINE_IDR(ib_uverbs_mw_idr);
70 DEFINE_IDR(ib_uverbs_ah_idr);
71 DEFINE_IDR(ib_uverbs_cq_idr);
72 DEFINE_IDR(ib_uverbs_qp_idr);
73 DEFINE_IDR(ib_uverbs_srq_idr);
74
75 static DEFINE_SPINLOCK(map_lock);
76 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
77 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
78
79 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
80                                      const char __user *buf, int in_len,
81                                      int out_len) = {
82         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
83         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
84         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
85         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
86         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
87         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
88         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
89         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
90         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
91         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
92         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
93         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
94         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
95         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
96         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
97         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
98         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
99         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
100         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
101         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
102         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
103         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
104         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
105         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
106         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
107         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
108         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
109         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
110 };
111
112 static void ib_uverbs_add_one(struct ib_device *device);
113 static void ib_uverbs_remove_one(struct ib_device *device);
114
115 static void ib_uverbs_release_dev(struct kref *ref)
116 {
117         struct ib_uverbs_device *dev =
118                 container_of(ref, struct ib_uverbs_device, ref);
119
120         complete(&dev->comp);
121 }
122
123 static void ib_uverbs_release_event_file(struct kref *ref)
124 {
125         struct ib_uverbs_event_file *file =
126                 container_of(ref, struct ib_uverbs_event_file, ref);
127
128         kfree(file);
129 }
130
131 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
132                           struct ib_uverbs_event_file *ev_file,
133                           struct ib_ucq_object *uobj)
134 {
135         struct ib_uverbs_event *evt, *tmp;
136
137         if (ev_file) {
138                 spin_lock_irq(&ev_file->lock);
139                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
140                         list_del(&evt->list);
141                         kfree(evt);
142                 }
143                 spin_unlock_irq(&ev_file->lock);
144
145                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
146         }
147
148         spin_lock_irq(&file->async_file->lock);
149         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
150                 list_del(&evt->list);
151                 kfree(evt);
152         }
153         spin_unlock_irq(&file->async_file->lock);
154 }
155
156 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
157                               struct ib_uevent_object *uobj)
158 {
159         struct ib_uverbs_event *evt, *tmp;
160
161         spin_lock_irq(&file->async_file->lock);
162         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
163                 list_del(&evt->list);
164                 kfree(evt);
165         }
166         spin_unlock_irq(&file->async_file->lock);
167 }
168
169 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
170                                     struct ib_uqp_object *uobj)
171 {
172         struct ib_uverbs_mcast_entry *mcast, *tmp;
173
174         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
175                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
176                 list_del(&mcast->list);
177                 kfree(mcast);
178         }
179 }
180
181 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
182                                       struct ib_ucontext *context)
183 {
184         struct ib_uobject *uobj, *tmp;
185
186         if (!context)
187                 return 0;
188
189         context->closing = 1;
190
191         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
192                 struct ib_ah *ah = uobj->object;
193
194                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
195                 ib_destroy_ah(ah);
196                 kfree(uobj);
197         }
198
199         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
200                 struct ib_qp *qp = uobj->object;
201                 struct ib_uqp_object *uqp =
202                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
203
204                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
205                 ib_uverbs_detach_umcast(qp, uqp);
206                 ib_destroy_qp(qp);
207                 ib_uverbs_release_uevent(file, &uqp->uevent);
208                 kfree(uqp);
209         }
210
211         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
212                 struct ib_cq *cq = uobj->object;
213                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
214                 struct ib_ucq_object *ucq =
215                         container_of(uobj, struct ib_ucq_object, uobject);
216
217                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
218                 ib_destroy_cq(cq);
219                 ib_uverbs_release_ucq(file, ev_file, ucq);
220                 kfree(ucq);
221         }
222
223         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
224                 struct ib_srq *srq = uobj->object;
225                 struct ib_uevent_object *uevent =
226                         container_of(uobj, struct ib_uevent_object, uobject);
227
228                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
229                 ib_destroy_srq(srq);
230                 ib_uverbs_release_uevent(file, uevent);
231                 kfree(uevent);
232         }
233
234         /* XXX Free MWs */
235
236         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
237                 struct ib_mr *mr = uobj->object;
238
239                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
240                 ib_dereg_mr(mr);
241                 kfree(uobj);
242         }
243
244         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
245                 struct ib_pd *pd = uobj->object;
246
247                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
248                 ib_dealloc_pd(pd);
249                 kfree(uobj);
250         }
251
252         return context->device->dealloc_ucontext(context);
253 }
254
255 static void ib_uverbs_release_file(struct kref *ref)
256 {
257         struct ib_uverbs_file *file =
258                 container_of(ref, struct ib_uverbs_file, ref);
259
260         module_put(file->device->ib_dev->owner);
261         kref_put(&file->device->ref, ib_uverbs_release_dev);
262
263         kfree(file);
264 }
265
266 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
267                                     size_t count, loff_t *pos)
268 {
269         struct ib_uverbs_event_file *file = filp->private_data;
270         struct ib_uverbs_event *event;
271         int eventsz;
272         int ret = 0;
273
274         spin_lock_irq(&file->lock);
275
276         while (list_empty(&file->event_list)) {
277                 spin_unlock_irq(&file->lock);
278
279                 if (filp->f_flags & O_NONBLOCK)
280                         return -EAGAIN;
281
282                 if (wait_event_interruptible(file->poll_wait,
283                                              !list_empty(&file->event_list)))
284                         return -ERESTARTSYS;
285
286                 spin_lock_irq(&file->lock);
287         }
288
289         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
290
291         if (file->is_async)
292                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
293         else
294                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
295
296         if (eventsz > count) {
297                 ret   = -EINVAL;
298                 event = NULL;
299         } else {
300                 list_del(file->event_list.next);
301                 if (event->counter) {
302                         ++(*event->counter);
303                         list_del(&event->obj_list);
304                 }
305         }
306
307         spin_unlock_irq(&file->lock);
308
309         if (event) {
310                 if (copy_to_user(buf, event, eventsz))
311                         ret = -EFAULT;
312                 else
313                         ret = eventsz;
314         }
315
316         kfree(event);
317
318         return ret;
319 }
320
321 static unsigned int ib_uverbs_event_poll(struct file *filp,
322                                          struct poll_table_struct *wait)
323 {
324         unsigned int pollflags = 0;
325         struct ib_uverbs_event_file *file = filp->private_data;
326
327         poll_wait(filp, &file->poll_wait, wait);
328
329         spin_lock_irq(&file->lock);
330         if (!list_empty(&file->event_list))
331                 pollflags = POLLIN | POLLRDNORM;
332         spin_unlock_irq(&file->lock);
333
334         return pollflags;
335 }
336
337 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
338 {
339         struct ib_uverbs_event_file *file = filp->private_data;
340
341         return fasync_helper(fd, filp, on, &file->async_queue);
342 }
343
344 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
345 {
346         struct ib_uverbs_event_file *file = filp->private_data;
347         struct ib_uverbs_event *entry, *tmp;
348
349         spin_lock_irq(&file->lock);
350         file->is_closed = 1;
351         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
352                 if (entry->counter)
353                         list_del(&entry->obj_list);
354                 kfree(entry);
355         }
356         spin_unlock_irq(&file->lock);
357
358         if (file->is_async) {
359                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
360                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
361         }
362         kref_put(&file->ref, ib_uverbs_release_event_file);
363
364         return 0;
365 }
366
367 static const struct file_operations uverbs_event_fops = {
368         .owner   = THIS_MODULE,
369         .read    = ib_uverbs_event_read,
370         .poll    = ib_uverbs_event_poll,
371         .release = ib_uverbs_event_close,
372         .fasync  = ib_uverbs_event_fasync
373 };
374
375 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
376 {
377         struct ib_uverbs_event_file    *file = cq_context;
378         struct ib_ucq_object           *uobj;
379         struct ib_uverbs_event         *entry;
380         unsigned long                   flags;
381
382         if (!file)
383                 return;
384
385         spin_lock_irqsave(&file->lock, flags);
386         if (file->is_closed) {
387                 spin_unlock_irqrestore(&file->lock, flags);
388                 return;
389         }
390
391         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
392         if (!entry) {
393                 spin_unlock_irqrestore(&file->lock, flags);
394                 return;
395         }
396
397         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
398
399         entry->desc.comp.cq_handle = cq->uobject->user_handle;
400         entry->counter             = &uobj->comp_events_reported;
401
402         list_add_tail(&entry->list, &file->event_list);
403         list_add_tail(&entry->obj_list, &uobj->comp_list);
404         spin_unlock_irqrestore(&file->lock, flags);
405
406         wake_up_interruptible(&file->poll_wait);
407         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
408 }
409
410 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
411                                     __u64 element, __u64 event,
412                                     struct list_head *obj_list,
413                                     u32 *counter)
414 {
415         struct ib_uverbs_event *entry;
416         unsigned long flags;
417
418         spin_lock_irqsave(&file->async_file->lock, flags);
419         if (file->async_file->is_closed) {
420                 spin_unlock_irqrestore(&file->async_file->lock, flags);
421                 return;
422         }
423
424         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
425         if (!entry) {
426                 spin_unlock_irqrestore(&file->async_file->lock, flags);
427                 return;
428         }
429
430         entry->desc.async.element    = element;
431         entry->desc.async.event_type = event;
432         entry->counter               = counter;
433
434         list_add_tail(&entry->list, &file->async_file->event_list);
435         if (obj_list)
436                 list_add_tail(&entry->obj_list, obj_list);
437         spin_unlock_irqrestore(&file->async_file->lock, flags);
438
439         wake_up_interruptible(&file->async_file->poll_wait);
440         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
441 }
442
443 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
444 {
445         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
446                                                   struct ib_ucq_object, uobject);
447
448         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
449                                 event->event, &uobj->async_list,
450                                 &uobj->async_events_reported);
451 }
452
453 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
454 {
455         struct ib_uevent_object *uobj;
456
457         uobj = container_of(event->element.qp->uobject,
458                             struct ib_uevent_object, uobject);
459
460         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
461                                 event->event, &uobj->event_list,
462                                 &uobj->events_reported);
463 }
464
465 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
466 {
467         struct ib_uevent_object *uobj;
468
469         uobj = container_of(event->element.srq->uobject,
470                             struct ib_uevent_object, uobject);
471
472         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
473                                 event->event, &uobj->event_list,
474                                 &uobj->events_reported);
475 }
476
477 void ib_uverbs_event_handler(struct ib_event_handler *handler,
478                              struct ib_event *event)
479 {
480         struct ib_uverbs_file *file =
481                 container_of(handler, struct ib_uverbs_file, event_handler);
482
483         ib_uverbs_async_handler(file, event->element.port_num, event->event,
484                                 NULL, NULL);
485 }
486
487 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
488                                         int is_async, int *fd)
489 {
490         struct ib_uverbs_event_file *ev_file;
491         struct file *filp;
492         int ret;
493
494         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
495         if (!ev_file)
496                 return ERR_PTR(-ENOMEM);
497
498         kref_init(&ev_file->ref);
499         spin_lock_init(&ev_file->lock);
500         INIT_LIST_HEAD(&ev_file->event_list);
501         init_waitqueue_head(&ev_file->poll_wait);
502         ev_file->uverbs_file = uverbs_file;
503         ev_file->async_queue = NULL;
504         ev_file->is_async    = is_async;
505         ev_file->is_closed   = 0;
506
507         *fd = get_unused_fd();
508         if (*fd < 0) {
509                 ret = *fd;
510                 goto err;
511         }
512
513         filp = anon_inode_getfile("[uverbs-event]", &uverbs_event_fops,
514                                   ev_file, O_RDONLY);
515         if (!filp) {
516                 ret = -ENFILE;
517                 goto err_fd;
518         }
519
520         return filp;
521
522 err_fd:
523         put_unused_fd(*fd);
524
525 err:
526         kfree(ev_file);
527         return ERR_PTR(ret);
528 }
529
530 /*
531  * Look up a completion event file by FD.  If lookup is successful,
532  * takes a ref to the event file struct that it returns; if
533  * unsuccessful, returns NULL.
534  */
535 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
536 {
537         struct ib_uverbs_event_file *ev_file = NULL;
538         struct file *filp;
539
540         filp = fget(fd);
541         if (!filp)
542                 return NULL;
543
544         if (filp->f_op != &uverbs_event_fops)
545                 goto out;
546
547         ev_file = filp->private_data;
548         if (ev_file->is_async) {
549                 ev_file = NULL;
550                 goto out;
551         }
552
553         kref_get(&ev_file->ref);
554
555 out:
556         fput(filp);
557         return ev_file;
558 }
559
560 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
561                              size_t count, loff_t *pos)
562 {
563         struct ib_uverbs_file *file = filp->private_data;
564         struct ib_uverbs_cmd_hdr hdr;
565
566         if (count < sizeof hdr)
567                 return -EINVAL;
568
569         if (copy_from_user(&hdr, buf, sizeof hdr))
570                 return -EFAULT;
571
572         if (hdr.in_words * 4 != count)
573                 return -EINVAL;
574
575         if (hdr.command < 0                             ||
576             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
577             !uverbs_cmd_table[hdr.command])
578                 return -EINVAL;
579
580         if (!file->ucontext &&
581             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
582                 return -EINVAL;
583
584         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
585                 return -ENOSYS;
586
587         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
588                                              hdr.in_words * 4, hdr.out_words * 4);
589 }
590
591 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
592 {
593         struct ib_uverbs_file *file = filp->private_data;
594
595         if (!file->ucontext)
596                 return -ENODEV;
597         else
598                 return file->device->ib_dev->mmap(file->ucontext, vma);
599 }
600
601 /*
602  * ib_uverbs_open() does not need the BKL:
603  *
604  *  - dev_table[] accesses are protected by map_lock, the
605  *    ib_uverbs_device structures are properly reference counted, and
606  *    everything else is purely local to the file being created, so
607  *    races against other open calls are not a problem;
608  *  - there is no ioctl method to race against;
609  *  - the device is added to dev_table[] as the last part of module
610  *    initialization, the open method will either immediately run
611  *    -ENXIO, or all required initialization will be done.
612  */
613 static int ib_uverbs_open(struct inode *inode, struct file *filp)
614 {
615         struct ib_uverbs_device *dev;
616         struct ib_uverbs_file *file;
617         int ret;
618
619         spin_lock(&map_lock);
620         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
621         if (dev)
622                 kref_get(&dev->ref);
623         spin_unlock(&map_lock);
624
625         if (!dev)
626                 return -ENXIO;
627
628         if (!try_module_get(dev->ib_dev->owner)) {
629                 ret = -ENODEV;
630                 goto err;
631         }
632
633         file = kmalloc(sizeof *file, GFP_KERNEL);
634         if (!file) {
635                 ret = -ENOMEM;
636                 goto err_module;
637         }
638
639         file->device     = dev;
640         file->ucontext   = NULL;
641         file->async_file = NULL;
642         kref_init(&file->ref);
643         mutex_init(&file->mutex);
644
645         filp->private_data = file;
646
647         return 0;
648
649 err_module:
650         module_put(dev->ib_dev->owner);
651
652 err:
653         kref_put(&dev->ref, ib_uverbs_release_dev);
654         return ret;
655 }
656
657 static int ib_uverbs_close(struct inode *inode, struct file *filp)
658 {
659         struct ib_uverbs_file *file = filp->private_data;
660
661         ib_uverbs_cleanup_ucontext(file, file->ucontext);
662
663         if (file->async_file)
664                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
665
666         kref_put(&file->ref, ib_uverbs_release_file);
667
668         return 0;
669 }
670
671 static const struct file_operations uverbs_fops = {
672         .owner   = THIS_MODULE,
673         .write   = ib_uverbs_write,
674         .open    = ib_uverbs_open,
675         .release = ib_uverbs_close
676 };
677
678 static const struct file_operations uverbs_mmap_fops = {
679         .owner   = THIS_MODULE,
680         .write   = ib_uverbs_write,
681         .mmap    = ib_uverbs_mmap,
682         .open    = ib_uverbs_open,
683         .release = ib_uverbs_close
684 };
685
686 static struct ib_client uverbs_client = {
687         .name   = "uverbs",
688         .add    = ib_uverbs_add_one,
689         .remove = ib_uverbs_remove_one
690 };
691
692 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
693                           char *buf)
694 {
695         struct ib_uverbs_device *dev = dev_get_drvdata(device);
696
697         if (!dev)
698                 return -ENODEV;
699
700         return sprintf(buf, "%s\n", dev->ib_dev->name);
701 }
702 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
703
704 static ssize_t show_dev_abi_version(struct device *device,
705                                     struct device_attribute *attr, char *buf)
706 {
707         struct ib_uverbs_device *dev = dev_get_drvdata(device);
708
709         if (!dev)
710                 return -ENODEV;
711
712         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
713 }
714 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
715
716 static ssize_t show_abi_version(struct class *class, char *buf)
717 {
718         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
719 }
720 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
721
722 static void ib_uverbs_add_one(struct ib_device *device)
723 {
724         struct ib_uverbs_device *uverbs_dev;
725
726         if (!device->alloc_ucontext)
727                 return;
728
729         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
730         if (!uverbs_dev)
731                 return;
732
733         kref_init(&uverbs_dev->ref);
734         init_completion(&uverbs_dev->comp);
735
736         spin_lock(&map_lock);
737         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
738         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
739                 spin_unlock(&map_lock);
740                 goto err;
741         }
742         set_bit(uverbs_dev->devnum, dev_map);
743         spin_unlock(&map_lock);
744
745         uverbs_dev->ib_dev           = device;
746         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
747
748         uverbs_dev->cdev = cdev_alloc();
749         if (!uverbs_dev->cdev)
750                 goto err;
751         uverbs_dev->cdev->owner = THIS_MODULE;
752         uverbs_dev->cdev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
753         kobject_set_name(&uverbs_dev->cdev->kobj, "uverbs%d", uverbs_dev->devnum);
754         if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
755                 goto err_cdev;
756
757         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
758                                         uverbs_dev->cdev->dev, uverbs_dev,
759                                         "uverbs%d", uverbs_dev->devnum);
760         if (IS_ERR(uverbs_dev->dev))
761                 goto err_cdev;
762
763         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
764                 goto err_class;
765         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
766                 goto err_class;
767
768         spin_lock(&map_lock);
769         dev_table[uverbs_dev->devnum] = uverbs_dev;
770         spin_unlock(&map_lock);
771
772         ib_set_client_data(device, &uverbs_client, uverbs_dev);
773
774         return;
775
776 err_class:
777         device_destroy(uverbs_class, uverbs_dev->cdev->dev);
778
779 err_cdev:
780         cdev_del(uverbs_dev->cdev);
781         clear_bit(uverbs_dev->devnum, dev_map);
782
783 err:
784         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
785         wait_for_completion(&uverbs_dev->comp);
786         kfree(uverbs_dev);
787         return;
788 }
789
790 static void ib_uverbs_remove_one(struct ib_device *device)
791 {
792         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
793
794         if (!uverbs_dev)
795                 return;
796
797         dev_set_drvdata(uverbs_dev->dev, NULL);
798         device_destroy(uverbs_class, uverbs_dev->cdev->dev);
799         cdev_del(uverbs_dev->cdev);
800
801         spin_lock(&map_lock);
802         dev_table[uverbs_dev->devnum] = NULL;
803         spin_unlock(&map_lock);
804
805         clear_bit(uverbs_dev->devnum, dev_map);
806
807         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
808         wait_for_completion(&uverbs_dev->comp);
809         kfree(uverbs_dev);
810 }
811
812 static int __init ib_uverbs_init(void)
813 {
814         int ret;
815
816         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
817                                      "infiniband_verbs");
818         if (ret) {
819                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
820                 goto out;
821         }
822
823         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
824         if (IS_ERR(uverbs_class)) {
825                 ret = PTR_ERR(uverbs_class);
826                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
827                 goto out_chrdev;
828         }
829
830         ret = class_create_file(uverbs_class, &class_attr_abi_version);
831         if (ret) {
832                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
833                 goto out_class;
834         }
835
836         ret = ib_register_client(&uverbs_client);
837         if (ret) {
838                 printk(KERN_ERR "user_verbs: couldn't register client\n");
839                 goto out_class;
840         }
841
842         return 0;
843
844 out_class:
845         class_destroy(uverbs_class);
846
847 out_chrdev:
848         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
849
850 out:
851         return ret;
852 }
853
854 static void __exit ib_uverbs_cleanup(void)
855 {
856         ib_unregister_client(&uverbs_client);
857         class_destroy(uverbs_class);
858         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
859         idr_destroy(&ib_uverbs_pd_idr);
860         idr_destroy(&ib_uverbs_mr_idr);
861         idr_destroy(&ib_uverbs_mw_idr);
862         idr_destroy(&ib_uverbs_ah_idr);
863         idr_destroy(&ib_uverbs_cq_idr);
864         idr_destroy(&ib_uverbs_qp_idr);
865         idr_destroy(&ib_uverbs_srq_idr);
866 }
867
868 module_init(ib_uverbs_init);
869 module_exit(ib_uverbs_cleanup);