IB/uverbs: Make ib_uverbs_release_event_file() static
[linux-2.6] / 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  * $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 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
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_RESIZE_CQ]           = ib_uverbs_resize_cq,
95         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
96         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
97         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
98         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
99         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
100         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
101         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
102         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
103         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
104         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
105         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
106         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
107         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
108         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
109         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
110         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
111         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
112         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
113 };
114
115 static struct vfsmount *uverbs_event_mnt;
116
117 static void ib_uverbs_add_one(struct ib_device *device);
118 static void ib_uverbs_remove_one(struct ib_device *device);
119
120 static void ib_uverbs_release_dev(struct kref *ref)
121 {
122         struct ib_uverbs_device *dev =
123                 container_of(ref, struct ib_uverbs_device, ref);
124
125         complete(&dev->comp);
126 }
127
128 static void ib_uverbs_release_event_file(struct kref *ref)
129 {
130         struct ib_uverbs_event_file *file =
131                 container_of(ref, struct ib_uverbs_event_file, ref);
132
133         kfree(file);
134 }
135
136 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
137                           struct ib_uverbs_event_file *ev_file,
138                           struct ib_ucq_object *uobj)
139 {
140         struct ib_uverbs_event *evt, *tmp;
141
142         if (ev_file) {
143                 spin_lock_irq(&ev_file->lock);
144                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
145                         list_del(&evt->list);
146                         kfree(evt);
147                 }
148                 spin_unlock_irq(&ev_file->lock);
149
150                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
151         }
152
153         spin_lock_irq(&file->async_file->lock);
154         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
155                 list_del(&evt->list);
156                 kfree(evt);
157         }
158         spin_unlock_irq(&file->async_file->lock);
159 }
160
161 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
162                               struct ib_uevent_object *uobj)
163 {
164         struct ib_uverbs_event *evt, *tmp;
165
166         spin_lock_irq(&file->async_file->lock);
167         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
168                 list_del(&evt->list);
169                 kfree(evt);
170         }
171         spin_unlock_irq(&file->async_file->lock);
172 }
173
174 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
175                                     struct ib_uqp_object *uobj)
176 {
177         struct ib_uverbs_mcast_entry *mcast, *tmp;
178
179         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
180                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
181                 list_del(&mcast->list);
182                 kfree(mcast);
183         }
184 }
185
186 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
187                                       struct ib_ucontext *context)
188 {
189         struct ib_uobject *uobj, *tmp;
190
191         if (!context)
192                 return 0;
193
194         context->closing = 1;
195
196         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
197                 struct ib_ah *ah = uobj->object;
198
199                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
200                 ib_destroy_ah(ah);
201                 kfree(uobj);
202         }
203
204         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
205                 struct ib_qp *qp = uobj->object;
206                 struct ib_uqp_object *uqp =
207                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
208
209                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
210                 ib_uverbs_detach_umcast(qp, uqp);
211                 ib_destroy_qp(qp);
212                 ib_uverbs_release_uevent(file, &uqp->uevent);
213                 kfree(uqp);
214         }
215
216         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
217                 struct ib_cq *cq = uobj->object;
218                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
219                 struct ib_ucq_object *ucq =
220                         container_of(uobj, struct ib_ucq_object, uobject);
221
222                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
223                 ib_destroy_cq(cq);
224                 ib_uverbs_release_ucq(file, ev_file, ucq);
225                 kfree(ucq);
226         }
227
228         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
229                 struct ib_srq *srq = uobj->object;
230                 struct ib_uevent_object *uevent =
231                         container_of(uobj, struct ib_uevent_object, uobject);
232
233                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
234                 ib_destroy_srq(srq);
235                 ib_uverbs_release_uevent(file, uevent);
236                 kfree(uevent);
237         }
238
239         /* XXX Free MWs */
240
241         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
242                 struct ib_mr *mr = uobj->object;
243
244                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
245                 ib_dereg_mr(mr);
246                 kfree(uobj);
247         }
248
249         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
250                 struct ib_pd *pd = uobj->object;
251
252                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
253                 ib_dealloc_pd(pd);
254                 kfree(uobj);
255         }
256
257         return context->device->dealloc_ucontext(context);
258 }
259
260 static void ib_uverbs_release_file(struct kref *ref)
261 {
262         struct ib_uverbs_file *file =
263                 container_of(ref, struct ib_uverbs_file, ref);
264
265         module_put(file->device->ib_dev->owner);
266         kref_put(&file->device->ref, ib_uverbs_release_dev);
267
268         kfree(file);
269 }
270
271 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
272                                     size_t count, loff_t *pos)
273 {
274         struct ib_uverbs_event_file *file = filp->private_data;
275         struct ib_uverbs_event *event;
276         int eventsz;
277         int ret = 0;
278
279         spin_lock_irq(&file->lock);
280
281         while (list_empty(&file->event_list)) {
282                 spin_unlock_irq(&file->lock);
283
284                 if (filp->f_flags & O_NONBLOCK)
285                         return -EAGAIN;
286
287                 if (wait_event_interruptible(file->poll_wait,
288                                              !list_empty(&file->event_list)))
289                         return -ERESTARTSYS;
290
291                 spin_lock_irq(&file->lock);
292         }
293
294         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
295
296         if (file->is_async)
297                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
298         else
299                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
300
301         if (eventsz > count) {
302                 ret   = -EINVAL;
303                 event = NULL;
304         } else {
305                 list_del(file->event_list.next);
306                 if (event->counter) {
307                         ++(*event->counter);
308                         list_del(&event->obj_list);
309                 }
310         }
311
312         spin_unlock_irq(&file->lock);
313
314         if (event) {
315                 if (copy_to_user(buf, event, eventsz))
316                         ret = -EFAULT;
317                 else
318                         ret = eventsz;
319         }
320
321         kfree(event);
322
323         return ret;
324 }
325
326 static unsigned int ib_uverbs_event_poll(struct file *filp,
327                                          struct poll_table_struct *wait)
328 {
329         unsigned int pollflags = 0;
330         struct ib_uverbs_event_file *file = filp->private_data;
331
332         poll_wait(filp, &file->poll_wait, wait);
333
334         spin_lock_irq(&file->lock);
335         if (!list_empty(&file->event_list))
336                 pollflags = POLLIN | POLLRDNORM;
337         spin_unlock_irq(&file->lock);
338
339         return pollflags;
340 }
341
342 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
343 {
344         struct ib_uverbs_event_file *file = filp->private_data;
345
346         return fasync_helper(fd, filp, on, &file->async_queue);
347 }
348
349 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
350 {
351         struct ib_uverbs_event_file *file = filp->private_data;
352         struct ib_uverbs_event *entry, *tmp;
353
354         spin_lock_irq(&file->lock);
355         file->file = NULL;
356         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
357                 if (entry->counter)
358                         list_del(&entry->obj_list);
359                 kfree(entry);
360         }
361         spin_unlock_irq(&file->lock);
362
363         ib_uverbs_event_fasync(-1, filp, 0);
364
365         if (file->is_async) {
366                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
367                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
368         }
369         kref_put(&file->ref, ib_uverbs_release_event_file);
370
371         return 0;
372 }
373
374 static const struct file_operations uverbs_event_fops = {
375         .owner   = THIS_MODULE,
376         .read    = ib_uverbs_event_read,
377         .poll    = ib_uverbs_event_poll,
378         .release = ib_uverbs_event_close,
379         .fasync  = ib_uverbs_event_fasync
380 };
381
382 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
383 {
384         struct ib_uverbs_event_file    *file = cq_context;
385         struct ib_ucq_object           *uobj;
386         struct ib_uverbs_event         *entry;
387         unsigned long                   flags;
388
389         if (!file)
390                 return;
391
392         spin_lock_irqsave(&file->lock, flags);
393         if (!file->file) {
394                 spin_unlock_irqrestore(&file->lock, flags);
395                 return;
396         }
397
398         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
399         if (!entry) {
400                 spin_unlock_irqrestore(&file->lock, flags);
401                 return;
402         }
403
404         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
405
406         entry->desc.comp.cq_handle = cq->uobject->user_handle;
407         entry->counter             = &uobj->comp_events_reported;
408
409         list_add_tail(&entry->list, &file->event_list);
410         list_add_tail(&entry->obj_list, &uobj->comp_list);
411         spin_unlock_irqrestore(&file->lock, flags);
412
413         wake_up_interruptible(&file->poll_wait);
414         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
415 }
416
417 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
418                                     __u64 element, __u64 event,
419                                     struct list_head *obj_list,
420                                     u32 *counter)
421 {
422         struct ib_uverbs_event *entry;
423         unsigned long flags;
424
425         spin_lock_irqsave(&file->async_file->lock, flags);
426         if (!file->async_file->file) {
427                 spin_unlock_irqrestore(&file->async_file->lock, flags);
428                 return;
429         }
430
431         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
432         if (!entry) {
433                 spin_unlock_irqrestore(&file->async_file->lock, flags);
434                 return;
435         }
436
437         entry->desc.async.element    = element;
438         entry->desc.async.event_type = event;
439         entry->counter               = counter;
440
441         list_add_tail(&entry->list, &file->async_file->event_list);
442         if (obj_list)
443                 list_add_tail(&entry->obj_list, obj_list);
444         spin_unlock_irqrestore(&file->async_file->lock, flags);
445
446         wake_up_interruptible(&file->async_file->poll_wait);
447         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
448 }
449
450 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
451 {
452         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
453                                                   struct ib_ucq_object, uobject);
454
455         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
456                                 event->event, &uobj->async_list,
457                                 &uobj->async_events_reported);
458 }
459
460 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
461 {
462         struct ib_uevent_object *uobj;
463
464         uobj = container_of(event->element.qp->uobject,
465                             struct ib_uevent_object, uobject);
466
467         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
468                                 event->event, &uobj->event_list,
469                                 &uobj->events_reported);
470 }
471
472 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
473 {
474         struct ib_uevent_object *uobj;
475
476         uobj = container_of(event->element.srq->uobject,
477                             struct ib_uevent_object, uobject);
478
479         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
480                                 event->event, &uobj->event_list,
481                                 &uobj->events_reported);
482 }
483
484 void ib_uverbs_event_handler(struct ib_event_handler *handler,
485                              struct ib_event *event)
486 {
487         struct ib_uverbs_file *file =
488                 container_of(handler, struct ib_uverbs_file, event_handler);
489
490         ib_uverbs_async_handler(file, event->element.port_num, event->event,
491                                 NULL, NULL);
492 }
493
494 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
495                                         int is_async, int *fd)
496 {
497         struct ib_uverbs_event_file *ev_file;
498         struct file *filp;
499         int ret;
500
501         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
502         if (!ev_file)
503                 return ERR_PTR(-ENOMEM);
504
505         kref_init(&ev_file->ref);
506         spin_lock_init(&ev_file->lock);
507         INIT_LIST_HEAD(&ev_file->event_list);
508         init_waitqueue_head(&ev_file->poll_wait);
509         ev_file->uverbs_file = uverbs_file;
510         ev_file->async_queue = NULL;
511         ev_file->is_async    = is_async;
512
513         *fd = get_unused_fd();
514         if (*fd < 0) {
515                 ret = *fd;
516                 goto err;
517         }
518
519         filp = get_empty_filp();
520         if (!filp) {
521                 ret = -ENFILE;
522                 goto err_fd;
523         }
524
525         ev_file->file      = filp;
526
527         /*
528          * fops_get() can't fail here, because we're coming from a
529          * system call on a uverbs file, which will already have a
530          * module reference.
531          */
532         filp->f_op         = fops_get(&uverbs_event_fops);
533         filp->f_path.mnt           = mntget(uverbs_event_mnt);
534         filp->f_path.dentry        = dget(uverbs_event_mnt->mnt_root);
535         filp->f_mapping    = filp->f_path.dentry->d_inode->i_mapping;
536         filp->f_flags      = O_RDONLY;
537         filp->f_mode       = FMODE_READ;
538         filp->private_data = ev_file;
539
540         return filp;
541
542 err_fd:
543         put_unused_fd(*fd);
544
545 err:
546         kfree(ev_file);
547         return ERR_PTR(ret);
548 }
549
550 /*
551  * Look up a completion event file by FD.  If lookup is successful,
552  * takes a ref to the event file struct that it returns; if
553  * unsuccessful, returns NULL.
554  */
555 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
556 {
557         struct ib_uverbs_event_file *ev_file = NULL;
558         struct file *filp;
559
560         filp = fget(fd);
561         if (!filp)
562                 return NULL;
563
564         if (filp->f_op != &uverbs_event_fops)
565                 goto out;
566
567         ev_file = filp->private_data;
568         if (ev_file->is_async) {
569                 ev_file = NULL;
570                 goto out;
571         }
572
573         kref_get(&ev_file->ref);
574
575 out:
576         fput(filp);
577         return ev_file;
578 }
579
580 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
581                              size_t count, loff_t *pos)
582 {
583         struct ib_uverbs_file *file = filp->private_data;
584         struct ib_uverbs_cmd_hdr hdr;
585
586         if (count < sizeof hdr)
587                 return -EINVAL;
588
589         if (copy_from_user(&hdr, buf, sizeof hdr))
590                 return -EFAULT;
591
592         if (hdr.in_words * 4 != count)
593                 return -EINVAL;
594
595         if (hdr.command < 0                             ||
596             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
597             !uverbs_cmd_table[hdr.command]              ||
598             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
599                 return -EINVAL;
600
601         if (!file->ucontext &&
602             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
603                 return -EINVAL;
604
605         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
606                                              hdr.in_words * 4, hdr.out_words * 4);
607 }
608
609 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
610 {
611         struct ib_uverbs_file *file = filp->private_data;
612
613         if (!file->ucontext)
614                 return -ENODEV;
615         else
616                 return file->device->ib_dev->mmap(file->ucontext, vma);
617 }
618
619 static int ib_uverbs_open(struct inode *inode, struct file *filp)
620 {
621         struct ib_uverbs_device *dev;
622         struct ib_uverbs_file *file;
623         int ret;
624
625         spin_lock(&map_lock);
626         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
627         if (dev)
628                 kref_get(&dev->ref);
629         spin_unlock(&map_lock);
630
631         if (!dev)
632                 return -ENXIO;
633
634         if (!try_module_get(dev->ib_dev->owner)) {
635                 ret = -ENODEV;
636                 goto err;
637         }
638
639         file = kmalloc(sizeof *file, GFP_KERNEL);
640         if (!file) {
641                 ret = -ENOMEM;
642                 goto err_module;
643         }
644
645         file->device     = dev;
646         file->ucontext   = NULL;
647         file->async_file = NULL;
648         kref_init(&file->ref);
649         mutex_init(&file->mutex);
650
651         filp->private_data = file;
652
653         return 0;
654
655 err_module:
656         module_put(dev->ib_dev->owner);
657
658 err:
659         kref_put(&dev->ref, ib_uverbs_release_dev);
660
661         return ret;
662 }
663
664 static int ib_uverbs_close(struct inode *inode, struct file *filp)
665 {
666         struct ib_uverbs_file *file = filp->private_data;
667
668         ib_uverbs_cleanup_ucontext(file, file->ucontext);
669
670         if (file->async_file)
671                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
672
673         kref_put(&file->ref, ib_uverbs_release_file);
674
675         return 0;
676 }
677
678 static const struct file_operations uverbs_fops = {
679         .owner   = THIS_MODULE,
680         .write   = ib_uverbs_write,
681         .open    = ib_uverbs_open,
682         .release = ib_uverbs_close
683 };
684
685 static const struct file_operations uverbs_mmap_fops = {
686         .owner   = THIS_MODULE,
687         .write   = ib_uverbs_write,
688         .mmap    = ib_uverbs_mmap,
689         .open    = ib_uverbs_open,
690         .release = ib_uverbs_close
691 };
692
693 static struct ib_client uverbs_client = {
694         .name   = "uverbs",
695         .add    = ib_uverbs_add_one,
696         .remove = ib_uverbs_remove_one
697 };
698
699 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
700 {
701         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
702
703         if (!dev)
704                 return -ENODEV;
705
706         return sprintf(buf, "%s\n", dev->ib_dev->name);
707 }
708 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
709
710 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
711 {
712         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
713
714         if (!dev)
715                 return -ENODEV;
716
717         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
718 }
719 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
720
721 static ssize_t show_abi_version(struct class *class, char *buf)
722 {
723         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
724 }
725 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
726
727 static void ib_uverbs_add_one(struct ib_device *device)
728 {
729         struct ib_uverbs_device *uverbs_dev;
730
731         if (!device->alloc_ucontext)
732                 return;
733
734         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
735         if (!uverbs_dev)
736                 return;
737
738         kref_init(&uverbs_dev->ref);
739         init_completion(&uverbs_dev->comp);
740
741         spin_lock(&map_lock);
742         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
743         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
744                 spin_unlock(&map_lock);
745                 goto err;
746         }
747         set_bit(uverbs_dev->devnum, dev_map);
748         spin_unlock(&map_lock);
749
750         uverbs_dev->ib_dev           = device;
751         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
752
753         uverbs_dev->dev = cdev_alloc();
754         if (!uverbs_dev->dev)
755                 goto err;
756         uverbs_dev->dev->owner = THIS_MODULE;
757         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
758         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
759         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
760                 goto err_cdev;
761
762         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
763                                                     uverbs_dev->dev->dev,
764                                                     device->dma_device,
765                                                     "uverbs%d", uverbs_dev->devnum);
766         if (IS_ERR(uverbs_dev->class_dev))
767                 goto err_cdev;
768
769         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
770
771         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
772                 goto err_class;
773         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
774                 goto err_class;
775
776         spin_lock(&map_lock);
777         dev_table[uverbs_dev->devnum] = uverbs_dev;
778         spin_unlock(&map_lock);
779
780         ib_set_client_data(device, &uverbs_client, uverbs_dev);
781
782         return;
783
784 err_class:
785         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
786
787 err_cdev:
788         cdev_del(uverbs_dev->dev);
789         clear_bit(uverbs_dev->devnum, dev_map);
790
791 err:
792         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
793         wait_for_completion(&uverbs_dev->comp);
794         kfree(uverbs_dev);
795         return;
796 }
797
798 static void ib_uverbs_remove_one(struct ib_device *device)
799 {
800         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
801
802         if (!uverbs_dev)
803                 return;
804
805         class_set_devdata(uverbs_dev->class_dev, NULL);
806         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
807         cdev_del(uverbs_dev->dev);
808
809         spin_lock(&map_lock);
810         dev_table[uverbs_dev->devnum] = NULL;
811         spin_unlock(&map_lock);
812
813         clear_bit(uverbs_dev->devnum, dev_map);
814
815         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
816         wait_for_completion(&uverbs_dev->comp);
817         kfree(uverbs_dev);
818 }
819
820 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
821                                const char *dev_name, void *data,
822                                struct vfsmount *mnt)
823 {
824         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
825                              INFINIBANDEVENTFS_MAGIC, mnt);
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);