IB/uverbs: track multicast group membership for userspace QPs
[linux-2.6.git] / 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  * 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  * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
37  */
38
39 #include <linux/module.h>
40 #include <linux/init.h>
41 #include <linux/device.h>
42 #include <linux/err.h>
43 #include <linux/fs.h>
44 #include <linux/poll.h>
45 #include <linux/file.h>
46 #include <linux/mount.h>
47 #include <linux/cdev.h>
48
49 #include <asm/uaccess.h>
50
51 #include "uverbs.h"
52
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55 MODULE_LICENSE("Dual BSD/GPL");
56
57 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
58
59 enum {
60         IB_UVERBS_MAJOR       = 231,
61         IB_UVERBS_BASE_MINOR  = 192,
62         IB_UVERBS_MAX_DEVICES = 32
63 };
64
65 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
66
67 static struct class *uverbs_class;
68
69 DECLARE_MUTEX(ib_uverbs_idr_mutex);
70 DEFINE_IDR(ib_uverbs_pd_idr);
71 DEFINE_IDR(ib_uverbs_mr_idr);
72 DEFINE_IDR(ib_uverbs_mw_idr);
73 DEFINE_IDR(ib_uverbs_ah_idr);
74 DEFINE_IDR(ib_uverbs_cq_idr);
75 DEFINE_IDR(ib_uverbs_qp_idr);
76 DEFINE_IDR(ib_uverbs_srq_idr);
77
78 static spinlock_t map_lock;
79 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
80 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
81
82 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
83                                      const char __user *buf, int in_len,
84                                      int out_len) = {
85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
91         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
92         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
93         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
94         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
95         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
96         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
97         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
98         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
99         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
100         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
101         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
102         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
103         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
104         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
105         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
106         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
107         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
108         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
109         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
110 };
111
112 static struct vfsmount *uverbs_event_mnt;
113
114 static void ib_uverbs_add_one(struct ib_device *device);
115 static void ib_uverbs_remove_one(struct ib_device *device);
116
117 static void ib_uverbs_release_dev(struct kref *ref)
118 {
119         struct ib_uverbs_device *dev =
120                 container_of(ref, struct ib_uverbs_device, ref);
121
122         kfree(dev);
123 }
124
125 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
126                           struct ib_uverbs_event_file *ev_file,
127                           struct ib_ucq_object *uobj)
128 {
129         struct ib_uverbs_event *evt, *tmp;
130
131         if (ev_file) {
132                 spin_lock_irq(&ev_file->lock);
133                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
134                         list_del(&evt->list);
135                         kfree(evt);
136                 }
137                 spin_unlock_irq(&ev_file->lock);
138
139                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
140         }
141
142         spin_lock_irq(&file->async_file->lock);
143         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
144                 list_del(&evt->list);
145                 kfree(evt);
146         }
147         spin_unlock_irq(&file->async_file->lock);
148 }
149
150 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
151                               struct ib_uevent_object *uobj)
152 {
153         struct ib_uverbs_event *evt, *tmp;
154
155         spin_lock_irq(&file->async_file->lock);
156         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
157                 list_del(&evt->list);
158                 kfree(evt);
159         }
160         spin_unlock_irq(&file->async_file->lock);
161 }
162
163 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
164                                     struct ib_uqp_object *uobj)
165 {
166         struct ib_uverbs_mcast_entry *mcast, *tmp;
167
168         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
169                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
170                 list_del(&mcast->list);
171                 kfree(mcast);
172         }
173 }
174
175 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
176                                       struct ib_ucontext *context)
177 {
178         struct ib_uobject *uobj, *tmp;
179
180         if (!context)
181                 return 0;
182
183         down(&ib_uverbs_idr_mutex);
184
185         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
186                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
187                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
188                 ib_destroy_ah(ah);
189                 list_del(&uobj->list);
190                 kfree(uobj);
191         }
192
193         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
194                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
195                 struct ib_uqp_object *uqp =
196                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
197                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
198                 ib_uverbs_detach_umcast(qp, uqp);
199                 ib_destroy_qp(qp);
200                 list_del(&uobj->list);
201                 ib_uverbs_release_uevent(file, &uqp->uevent);
202                 kfree(uqp);
203         }
204
205         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
206                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
207                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
208                 struct ib_ucq_object *ucq =
209                         container_of(uobj, struct ib_ucq_object, uobject);
210                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
211                 ib_destroy_cq(cq);
212                 list_del(&uobj->list);
213                 ib_uverbs_release_ucq(file, ev_file, ucq);
214                 kfree(ucq);
215         }
216
217         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
218                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
219                 struct ib_uevent_object *uevent =
220                         container_of(uobj, struct ib_uevent_object, uobject);
221                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
222                 ib_destroy_srq(srq);
223                 list_del(&uobj->list);
224                 ib_uverbs_release_uevent(file, uevent);
225                 kfree(uevent);
226         }
227
228         /* XXX Free MWs */
229
230         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
231                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
232                 struct ib_device *mrdev = mr->device;
233                 struct ib_umem_object *memobj;
234
235                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
236                 ib_dereg_mr(mr);
237
238                 memobj = container_of(uobj, struct ib_umem_object, uobject);
239                 ib_umem_release_on_close(mrdev, &memobj->umem);
240
241                 list_del(&uobj->list);
242                 kfree(memobj);
243         }
244
245         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
246                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
247                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
248                 ib_dealloc_pd(pd);
249                 list_del(&uobj->list);
250                 kfree(uobj);
251         }
252
253         up(&ib_uverbs_idr_mutex);
254
255         return context->device->dealloc_ucontext(context);
256 }
257
258 static void ib_uverbs_release_file(struct kref *ref)
259 {
260         struct ib_uverbs_file *file =
261                 container_of(ref, struct ib_uverbs_file, ref);
262
263         module_put(file->device->ib_dev->owner);
264         kref_put(&file->device->ref, ib_uverbs_release_dev);
265
266         kfree(file);
267 }
268
269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
270                                     size_t count, loff_t *pos)
271 {
272         struct ib_uverbs_event_file *file = filp->private_data;
273         struct ib_uverbs_event *event;
274         int eventsz;
275         int ret = 0;
276
277         spin_lock_irq(&file->lock);
278
279         while (list_empty(&file->event_list)) {
280                 spin_unlock_irq(&file->lock);
281
282                 if (filp->f_flags & O_NONBLOCK)
283                         return -EAGAIN;
284
285                 if (wait_event_interruptible(file->poll_wait,
286                                              !list_empty(&file->event_list)))
287                         return -ERESTARTSYS;
288
289                 spin_lock_irq(&file->lock);
290         }
291
292         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
293
294         if (file->is_async)
295                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
296         else
297                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
298
299         if (eventsz > count) {
300                 ret   = -EINVAL;
301                 event = NULL;
302         } else {
303                 list_del(file->event_list.next);
304                 if (event->counter) {
305                         ++(*event->counter);
306                         list_del(&event->obj_list);
307                 }
308         }
309
310         spin_unlock_irq(&file->lock);
311
312         if (event) {
313                 if (copy_to_user(buf, event, eventsz))
314                         ret = -EFAULT;
315                 else
316                         ret = eventsz;
317         }
318
319         kfree(event);
320
321         return ret;
322 }
323
324 static unsigned int ib_uverbs_event_poll(struct file *filp,
325                                          struct poll_table_struct *wait)
326 {
327         unsigned int pollflags = 0;
328         struct ib_uverbs_event_file *file = filp->private_data;
329
330         poll_wait(filp, &file->poll_wait, wait);
331
332         spin_lock_irq(&file->lock);
333         if (!list_empty(&file->event_list))
334                 pollflags = POLLIN | POLLRDNORM;
335         spin_unlock_irq(&file->lock);
336
337         return pollflags;
338 }
339
340 void ib_uverbs_release_event_file(struct kref *ref)
341 {
342         struct ib_uverbs_event_file *file =
343                 container_of(ref, struct ib_uverbs_event_file, ref);
344
345         kfree(file);
346 }
347
348 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
349 {
350         struct ib_uverbs_event_file *file = filp->private_data;
351
352         return fasync_helper(fd, filp, on, &file->async_queue);
353 }
354
355 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
356 {
357         struct ib_uverbs_event_file *file = filp->private_data;
358         struct ib_uverbs_event *entry, *tmp;
359
360         spin_lock_irq(&file->lock);
361         file->file = NULL;
362         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
363                 if (entry->counter)
364                         list_del(&entry->obj_list);
365                 kfree(entry);
366         }
367         spin_unlock_irq(&file->lock);
368
369         ib_uverbs_event_fasync(-1, filp, 0);
370
371         if (file->is_async) {
372                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
373                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
374         }
375         kref_put(&file->ref, ib_uverbs_release_event_file);
376
377         return 0;
378 }
379
380 static struct file_operations uverbs_event_fops = {
381         .owner   = THIS_MODULE,
382         .read    = ib_uverbs_event_read,
383         .poll    = ib_uverbs_event_poll,
384         .release = ib_uverbs_event_close,
385         .fasync  = ib_uverbs_event_fasync
386 };
387
388 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
389 {
390         struct ib_uverbs_event_file    *file = cq_context;
391         struct ib_ucq_object           *uobj;
392         struct ib_uverbs_event         *entry;
393         unsigned long                   flags;
394
395         if (!file)
396                 return;
397
398         spin_lock_irqsave(&file->lock, flags);
399         if (!file->file) {
400                 spin_unlock_irqrestore(&file->lock, flags);
401                 return;
402         }
403
404         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
405         if (!entry) {
406                 spin_unlock_irqrestore(&file->lock, flags);
407                 return;
408         }
409
410         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
411
412         entry->desc.comp.cq_handle = cq->uobject->user_handle;
413         entry->counter             = &uobj->comp_events_reported;
414
415         list_add_tail(&entry->list, &file->event_list);
416         list_add_tail(&entry->obj_list, &uobj->comp_list);
417         spin_unlock_irqrestore(&file->lock, flags);
418
419         wake_up_interruptible(&file->poll_wait);
420         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
421 }
422
423 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
424                                     __u64 element, __u64 event,
425                                     struct list_head *obj_list,
426                                     u32 *counter)
427 {
428         struct ib_uverbs_event *entry;
429         unsigned long flags;
430
431         spin_lock_irqsave(&file->async_file->lock, flags);
432         if (!file->async_file->file) {
433                 spin_unlock_irqrestore(&file->async_file->lock, flags);
434                 return;
435         }
436
437         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
438         if (!entry) {
439                 spin_unlock_irqrestore(&file->async_file->lock, flags);
440                 return;
441         }
442
443         entry->desc.async.element    = element;
444         entry->desc.async.event_type = event;
445         entry->counter               = counter;
446
447         list_add_tail(&entry->list, &file->async_file->event_list);
448         if (obj_list)
449                 list_add_tail(&entry->obj_list, obj_list);
450         spin_unlock_irqrestore(&file->async_file->lock, flags);
451
452         wake_up_interruptible(&file->async_file->poll_wait);
453         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
454 }
455
456 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
457 {
458         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
459                                                   struct ib_ucq_object, uobject);
460
461         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
462                                 event->event, &uobj->async_list,
463                                 &uobj->async_events_reported);
464                                 
465 }
466
467 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
468 {
469         struct ib_uevent_object *uobj;
470
471         uobj = container_of(event->element.qp->uobject,
472                             struct ib_uevent_object, uobject);
473
474         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
475                                 event->event, &uobj->event_list,
476                                 &uobj->events_reported);
477 }
478
479 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
480 {
481         struct ib_uevent_object *uobj;
482
483         uobj = container_of(event->element.srq->uobject,
484                             struct ib_uevent_object, uobject);
485
486         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
487                                 event->event, &uobj->event_list,
488                                 &uobj->events_reported);
489 }
490
491 void ib_uverbs_event_handler(struct ib_event_handler *handler,
492                              struct ib_event *event)
493 {
494         struct ib_uverbs_file *file =
495                 container_of(handler, struct ib_uverbs_file, event_handler);
496
497         ib_uverbs_async_handler(file, event->element.port_num, event->event,
498                                 NULL, NULL);
499 }
500
501 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
502                                         int is_async, int *fd)
503 {
504         struct ib_uverbs_event_file *ev_file;
505         struct file *filp;
506         int ret;
507
508         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
509         if (!ev_file)
510                 return ERR_PTR(-ENOMEM);
511
512         kref_init(&ev_file->ref);
513         spin_lock_init(&ev_file->lock);
514         INIT_LIST_HEAD(&ev_file->event_list);
515         init_waitqueue_head(&ev_file->poll_wait);
516         ev_file->uverbs_file = uverbs_file;
517         ev_file->async_queue = NULL;
518         ev_file->is_async    = is_async;
519
520         *fd = get_unused_fd();
521         if (*fd < 0) {
522                 ret = *fd;
523                 goto err;
524         }
525
526         filp = get_empty_filp();
527         if (!filp) {
528                 ret = -ENFILE;
529                 goto err_fd;
530         }
531
532         ev_file->file      = filp;
533
534         /*
535          * fops_get() can't fail here, because we're coming from a
536          * system call on a uverbs file, which will already have a
537          * module reference.
538          */
539         filp->f_op         = fops_get(&uverbs_event_fops);
540         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
541         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
542         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
543         filp->f_flags      = O_RDONLY;
544         filp->f_mode       = FMODE_READ;
545         filp->private_data = ev_file;
546
547         return filp;
548
549 err_fd:
550         put_unused_fd(*fd);
551
552 err:
553         kfree(ev_file);
554         return ERR_PTR(ret);
555 }
556
557 /*
558  * Look up a completion event file by FD.  If lookup is successful,
559  * takes a ref to the event file struct that it returns; if
560  * unsuccessful, returns NULL.
561  */
562 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
563 {
564         struct ib_uverbs_event_file *ev_file = NULL;
565         struct file *filp;
566
567         filp = fget(fd);
568         if (!filp)
569                 return NULL;
570
571         if (filp->f_op != &uverbs_event_fops)
572                 goto out;
573
574         ev_file = filp->private_data;
575         if (ev_file->is_async) {
576                 ev_file = NULL;
577                 goto out;
578         }
579
580         kref_get(&ev_file->ref);
581
582 out:
583         fput(filp);
584         return ev_file;
585 }
586
587 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
588                              size_t count, loff_t *pos)
589 {
590         struct ib_uverbs_file *file = filp->private_data;
591         struct ib_uverbs_cmd_hdr hdr;
592
593         if (count < sizeof hdr)
594                 return -EINVAL;
595
596         if (copy_from_user(&hdr, buf, sizeof hdr))
597                 return -EFAULT;
598
599         if (hdr.in_words * 4 != count)
600                 return -EINVAL;
601
602         if (hdr.command < 0                             ||
603             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
604             !uverbs_cmd_table[hdr.command]              ||
605             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
606                 return -EINVAL;
607
608         if (!file->ucontext &&
609             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
610                 return -EINVAL;
611
612         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
613                                              hdr.in_words * 4, hdr.out_words * 4);
614 }
615
616 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
617 {
618         struct ib_uverbs_file *file = filp->private_data;
619
620         if (!file->ucontext)
621                 return -ENODEV;
622         else
623                 return file->device->ib_dev->mmap(file->ucontext, vma);
624 }
625
626 static int ib_uverbs_open(struct inode *inode, struct file *filp)
627 {
628         struct ib_uverbs_device *dev;
629         struct ib_uverbs_file *file;
630         int ret;
631
632         spin_lock(&map_lock);
633         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
634         if (dev)
635                 kref_get(&dev->ref);
636         spin_unlock(&map_lock);
637
638         if (!dev)
639                 return -ENXIO;
640
641         if (!try_module_get(dev->ib_dev->owner)) {
642                 ret = -ENODEV;
643                 goto err;
644         }
645
646         file = kmalloc(sizeof *file, GFP_KERNEL);
647         if (!file) {
648                 ret = -ENOMEM;
649                 goto err_module;
650         }
651
652         file->device     = dev;
653         file->ucontext   = NULL;
654         file->async_file = NULL;
655         kref_init(&file->ref);
656         init_MUTEX(&file->mutex);
657
658         filp->private_data = file;
659
660         return 0;
661
662 err_module:
663         module_put(dev->ib_dev->owner);
664
665 err:
666         kref_put(&dev->ref, ib_uverbs_release_dev);
667
668         return ret;
669 }
670
671 static int ib_uverbs_close(struct inode *inode, struct file *filp)
672 {
673         struct ib_uverbs_file *file = filp->private_data;
674
675         ib_uverbs_cleanup_ucontext(file, file->ucontext);
676
677         if (file->async_file)
678                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
679
680         kref_put(&file->ref, ib_uverbs_release_file);
681
682         return 0;
683 }
684
685 static struct file_operations uverbs_fops = {
686         .owner   = THIS_MODULE,
687         .write   = ib_uverbs_write,
688         .open    = ib_uverbs_open,
689         .release = ib_uverbs_close
690 };
691
692 static struct file_operations uverbs_mmap_fops = {
693         .owner   = THIS_MODULE,
694         .write   = ib_uverbs_write,
695         .mmap    = ib_uverbs_mmap,
696         .open    = ib_uverbs_open,
697         .release = ib_uverbs_close
698 };
699
700 static struct ib_client uverbs_client = {
701         .name   = "uverbs",
702         .add    = ib_uverbs_add_one,
703         .remove = ib_uverbs_remove_one
704 };
705
706 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
707 {
708         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
709
710         if (!dev)
711                 return -ENODEV;
712
713         return sprintf(buf, "%s\n", dev->ib_dev->name);
714 }
715 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
716
717 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
718 {
719         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
720
721         if (!dev)
722                 return -ENODEV;
723
724         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
725 }
726 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
727
728 static ssize_t show_abi_version(struct class *class, char *buf)
729 {
730         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
731 }
732 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
733
734 static void ib_uverbs_add_one(struct ib_device *device)
735 {
736         struct ib_uverbs_device *uverbs_dev;
737
738         if (!device->alloc_ucontext)
739                 return;
740
741         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
742         if (!uverbs_dev)
743                 return;
744
745         kref_init(&uverbs_dev->ref);
746
747         spin_lock(&map_lock);
748         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
749         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
750                 spin_unlock(&map_lock);
751                 goto err;
752         }
753         set_bit(uverbs_dev->devnum, dev_map);
754         spin_unlock(&map_lock);
755
756         uverbs_dev->ib_dev           = device;
757         uverbs_dev->num_comp_vectors = 1;
758
759         uverbs_dev->dev = cdev_alloc();
760         if (!uverbs_dev->dev)
761                 goto err;
762         uverbs_dev->dev->owner = THIS_MODULE;
763         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
764         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
765         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
766                 goto err_cdev;
767
768         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
769                                                     uverbs_dev->dev->dev,
770                                                     device->dma_device,
771                                                     "uverbs%d", uverbs_dev->devnum);
772         if (IS_ERR(uverbs_dev->class_dev))
773                 goto err_cdev;
774
775         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
776
777         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
778                 goto err_class;
779         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
780                 goto err_class;
781
782         spin_lock(&map_lock);
783         dev_table[uverbs_dev->devnum] = uverbs_dev;
784         spin_unlock(&map_lock);
785
786         ib_set_client_data(device, &uverbs_client, uverbs_dev);
787
788         return;
789
790 err_class:
791         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
792
793 err_cdev:
794         cdev_del(uverbs_dev->dev);
795         clear_bit(uverbs_dev->devnum, dev_map);
796
797 err:
798         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
799         return;
800 }
801
802 static void ib_uverbs_remove_one(struct ib_device *device)
803 {
804         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
805
806         if (!uverbs_dev)
807                 return;
808
809         class_set_devdata(uverbs_dev->class_dev, NULL);
810         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
811         cdev_del(uverbs_dev->dev);
812
813         spin_lock(&map_lock);
814         dev_table[uverbs_dev->devnum] = NULL;
815         spin_unlock(&map_lock);
816
817         clear_bit(uverbs_dev->devnum, dev_map);
818         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
819 }
820
821 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
822                                                const char *dev_name, void *data)
823 {
824         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
825                              INFINIBANDEVENTFS_MAGIC);
826 }
827
828 static struct file_system_type uverbs_event_fs = {
829         /* No owner field so module can be unloaded */
830         .name    = "infinibandeventfs",
831         .get_sb  = uverbs_event_get_sb,
832         .kill_sb = kill_litter_super
833 };
834
835 static int __init ib_uverbs_init(void)
836 {
837         int ret;
838
839         spin_lock_init(&map_lock);
840
841         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
842                                      "infiniband_verbs");
843         if (ret) {
844                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
845                 goto out;
846         }
847
848         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
849         if (IS_ERR(uverbs_class)) {
850                 ret = PTR_ERR(uverbs_class);
851                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
852                 goto out_chrdev;
853         }
854
855         ret = class_create_file(uverbs_class, &class_attr_abi_version);
856         if (ret) {
857                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
858                 goto out_class;
859         }
860
861         ret = register_filesystem(&uverbs_event_fs);
862         if (ret) {
863                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
864                 goto out_class;
865         }
866
867         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
868         if (IS_ERR(uverbs_event_mnt)) {
869                 ret = PTR_ERR(uverbs_event_mnt);
870                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
871                 goto out_fs;
872         }
873
874         ret = ib_register_client(&uverbs_client);
875         if (ret) {
876                 printk(KERN_ERR "user_verbs: couldn't register client\n");
877                 goto out_mnt;
878         }
879
880         return 0;
881
882 out_mnt:
883         mntput(uverbs_event_mnt);
884
885 out_fs:
886         unregister_filesystem(&uverbs_event_fs);
887
888 out_class:
889         class_destroy(uverbs_class);
890
891 out_chrdev:
892         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
893
894 out:
895         return ret;
896 }
897
898 static void __exit ib_uverbs_cleanup(void)
899 {
900         ib_unregister_client(&uverbs_client);
901         mntput(uverbs_event_mnt);
902         unregister_filesystem(&uverbs_event_fs);
903         class_destroy(uverbs_class);
904         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
905         idr_destroy(&ib_uverbs_pd_idr);
906         idr_destroy(&ib_uverbs_mr_idr);
907         idr_destroy(&ib_uverbs_mw_idr);
908         idr_destroy(&ib_uverbs_ah_idr);
909         idr_destroy(&ib_uverbs_cq_idr);
910         idr_destroy(&ib_uverbs_qp_idr);
911         idr_destroy(&ib_uverbs_srq_idr);
912 }
913
914 module_init(ib_uverbs_init);
915 module_exit(ib_uverbs_cleanup);