de6581d7cb8db5c979938c80f9b0fef336f56dd3
[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 int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
164                                       struct ib_ucontext *context)
165 {
166         struct ib_uobject *uobj, *tmp;
167
168         if (!context)
169                 return 0;
170
171         down(&ib_uverbs_idr_mutex);
172
173         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
174                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
175                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
176                 ib_destroy_ah(ah);
177                 list_del(&uobj->list);
178                 kfree(uobj);
179         }
180
181         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
182                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
183                 struct ib_uevent_object *uevent =
184                         container_of(uobj, struct ib_uevent_object, uobject);
185                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
186                 ib_destroy_qp(qp);
187                 list_del(&uobj->list);
188                 ib_uverbs_release_uevent(file, uevent);
189                 kfree(uevent);
190         }
191
192         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
193                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
194                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
195                 struct ib_ucq_object *ucq =
196                         container_of(uobj, struct ib_ucq_object, uobject);
197                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
198                 ib_destroy_cq(cq);
199                 list_del(&uobj->list);
200                 ib_uverbs_release_ucq(file, ev_file, ucq);
201                 kfree(ucq);
202         }
203
204         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
205                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
206                 struct ib_uevent_object *uevent =
207                         container_of(uobj, struct ib_uevent_object, uobject);
208                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
209                 ib_destroy_srq(srq);
210                 list_del(&uobj->list);
211                 ib_uverbs_release_uevent(file, uevent);
212                 kfree(uevent);
213         }
214
215         /* XXX Free MWs */
216
217         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
218                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
219                 struct ib_device *mrdev = mr->device;
220                 struct ib_umem_object *memobj;
221
222                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
223                 ib_dereg_mr(mr);
224
225                 memobj = container_of(uobj, struct ib_umem_object, uobject);
226                 ib_umem_release_on_close(mrdev, &memobj->umem);
227
228                 list_del(&uobj->list);
229                 kfree(memobj);
230         }
231
232         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
233                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
234                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
235                 ib_dealloc_pd(pd);
236                 list_del(&uobj->list);
237                 kfree(uobj);
238         }
239
240         up(&ib_uverbs_idr_mutex);
241
242         return context->device->dealloc_ucontext(context);
243 }
244
245 static void ib_uverbs_release_file(struct kref *ref)
246 {
247         struct ib_uverbs_file *file =
248                 container_of(ref, struct ib_uverbs_file, ref);
249
250         module_put(file->device->ib_dev->owner);
251         kref_put(&file->device->ref, ib_uverbs_release_dev);
252
253         kfree(file);
254 }
255
256 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
257                                     size_t count, loff_t *pos)
258 {
259         struct ib_uverbs_event_file *file = filp->private_data;
260         struct ib_uverbs_event *event;
261         int eventsz;
262         int ret = 0;
263
264         spin_lock_irq(&file->lock);
265
266         while (list_empty(&file->event_list)) {
267                 spin_unlock_irq(&file->lock);
268
269                 if (filp->f_flags & O_NONBLOCK)
270                         return -EAGAIN;
271
272                 if (wait_event_interruptible(file->poll_wait,
273                                              !list_empty(&file->event_list)))
274                         return -ERESTARTSYS;
275
276                 spin_lock_irq(&file->lock);
277         }
278
279         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
280
281         if (file->is_async)
282                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
283         else
284                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
285
286         if (eventsz > count) {
287                 ret   = -EINVAL;
288                 event = NULL;
289         } else {
290                 list_del(file->event_list.next);
291                 if (event->counter) {
292                         ++(*event->counter);
293                         list_del(&event->obj_list);
294                 }
295         }
296
297         spin_unlock_irq(&file->lock);
298
299         if (event) {
300                 if (copy_to_user(buf, event, eventsz))
301                         ret = -EFAULT;
302                 else
303                         ret = eventsz;
304         }
305
306         kfree(event);
307
308         return ret;
309 }
310
311 static unsigned int ib_uverbs_event_poll(struct file *filp,
312                                          struct poll_table_struct *wait)
313 {
314         unsigned int pollflags = 0;
315         struct ib_uverbs_event_file *file = filp->private_data;
316
317         poll_wait(filp, &file->poll_wait, wait);
318
319         spin_lock_irq(&file->lock);
320         if (!list_empty(&file->event_list))
321                 pollflags = POLLIN | POLLRDNORM;
322         spin_unlock_irq(&file->lock);
323
324         return pollflags;
325 }
326
327 void ib_uverbs_release_event_file(struct kref *ref)
328 {
329         struct ib_uverbs_event_file *file =
330                 container_of(ref, struct ib_uverbs_event_file, ref);
331
332         kfree(file);
333 }
334
335 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
336 {
337         struct ib_uverbs_event_file *file = filp->private_data;
338
339         return fasync_helper(fd, filp, on, &file->async_queue);
340 }
341
342 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
343 {
344         struct ib_uverbs_event_file *file = filp->private_data;
345         struct ib_uverbs_event *entry, *tmp;
346
347         spin_lock_irq(&file->lock);
348         file->file = NULL;
349         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
350                 if (entry->counter)
351                         list_del(&entry->obj_list);
352                 kfree(entry);
353         }
354         spin_unlock_irq(&file->lock);
355
356         ib_uverbs_event_fasync(-1, filp, 0);
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 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->file) {
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->file) {
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
454 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
455 {
456         struct ib_uevent_object *uobj;
457
458         uobj = container_of(event->element.qp->uobject,
459                             struct ib_uevent_object, uobject);
460
461         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
462                                 event->event, &uobj->event_list,
463                                 &uobj->events_reported);
464 }
465
466 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
467 {
468         struct ib_uevent_object *uobj;
469
470         uobj = container_of(event->element.srq->uobject,
471                             struct ib_uevent_object, uobject);
472
473         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
474                                 event->event, &uobj->event_list,
475                                 &uobj->events_reported);
476 }
477
478 void ib_uverbs_event_handler(struct ib_event_handler *handler,
479                              struct ib_event *event)
480 {
481         struct ib_uverbs_file *file =
482                 container_of(handler, struct ib_uverbs_file, event_handler);
483
484         ib_uverbs_async_handler(file, event->element.port_num, event->event,
485                                 NULL, NULL);
486 }
487
488 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
489                                         int is_async, int *fd)
490 {
491         struct ib_uverbs_event_file *ev_file;
492         struct file *filp;
493         int ret;
494
495         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
496         if (!ev_file)
497                 return ERR_PTR(-ENOMEM);
498
499         kref_init(&ev_file->ref);
500         spin_lock_init(&ev_file->lock);
501         INIT_LIST_HEAD(&ev_file->event_list);
502         init_waitqueue_head(&ev_file->poll_wait);
503         ev_file->uverbs_file = uverbs_file;
504         ev_file->async_queue = NULL;
505         ev_file->is_async    = is_async;
506
507         *fd = get_unused_fd();
508         if (*fd < 0) {
509                 ret = *fd;
510                 goto err;
511         }
512
513         filp = get_empty_filp();
514         if (!filp) {
515                 ret = -ENFILE;
516                 goto err_fd;
517         }
518
519         ev_file->file      = filp;
520
521         /*
522          * fops_get() can't fail here, because we're coming from a
523          * system call on a uverbs file, which will already have a
524          * module reference.
525          */
526         filp->f_op         = fops_get(&uverbs_event_fops);
527         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
528         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
529         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
530         filp->f_flags      = O_RDONLY;
531         filp->f_mode       = FMODE_READ;
532         filp->private_data = ev_file;
533
534         return filp;
535
536 err_fd:
537         put_unused_fd(*fd);
538
539 err:
540         kfree(ev_file);
541         return ERR_PTR(ret);
542 }
543
544 /*
545  * Look up a completion event file by FD.  If lookup is successful,
546  * takes a ref to the event file struct that it returns; if
547  * unsuccessful, returns NULL.
548  */
549 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
550 {
551         struct ib_uverbs_event_file *ev_file = NULL;
552         struct file *filp;
553
554         filp = fget(fd);
555         if (!filp)
556                 return NULL;
557
558         if (filp->f_op != &uverbs_event_fops)
559                 goto out;
560
561         ev_file = filp->private_data;
562         if (ev_file->is_async) {
563                 ev_file = NULL;
564                 goto out;
565         }
566
567         kref_get(&ev_file->ref);
568
569 out:
570         fput(filp);
571         return ev_file;
572 }
573
574 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
575                              size_t count, loff_t *pos)
576 {
577         struct ib_uverbs_file *file = filp->private_data;
578         struct ib_uverbs_cmd_hdr hdr;
579
580         if (count < sizeof hdr)
581                 return -EINVAL;
582
583         if (copy_from_user(&hdr, buf, sizeof hdr))
584                 return -EFAULT;
585
586         if (hdr.in_words * 4 != count)
587                 return -EINVAL;
588
589         if (hdr.command < 0                             ||
590             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
591             !uverbs_cmd_table[hdr.command]              ||
592             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
593                 return -EINVAL;
594
595         if (!file->ucontext &&
596             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
597                 return -EINVAL;
598
599         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
600                                              hdr.in_words * 4, hdr.out_words * 4);
601 }
602
603 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
604 {
605         struct ib_uverbs_file *file = filp->private_data;
606
607         if (!file->ucontext)
608                 return -ENODEV;
609         else
610                 return file->device->ib_dev->mmap(file->ucontext, vma);
611 }
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         init_MUTEX(&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
655         return ret;
656 }
657
658 static int ib_uverbs_close(struct inode *inode, struct file *filp)
659 {
660         struct ib_uverbs_file *file = filp->private_data;
661
662         ib_uverbs_cleanup_ucontext(file, file->ucontext);
663
664         if (file->async_file)
665                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
666
667         kref_put(&file->ref, ib_uverbs_release_file);
668
669         return 0;
670 }
671
672 static struct file_operations uverbs_fops = {
673         .owner   = THIS_MODULE,
674         .write   = ib_uverbs_write,
675         .open    = ib_uverbs_open,
676         .release = ib_uverbs_close
677 };
678
679 static struct file_operations uverbs_mmap_fops = {
680         .owner   = THIS_MODULE,
681         .write   = ib_uverbs_write,
682         .mmap    = ib_uverbs_mmap,
683         .open    = ib_uverbs_open,
684         .release = ib_uverbs_close
685 };
686
687 static struct ib_client uverbs_client = {
688         .name   = "uverbs",
689         .add    = ib_uverbs_add_one,
690         .remove = ib_uverbs_remove_one
691 };
692
693 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
694 {
695         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
696
697         if (!dev)
698                 return -ENODEV;
699
700         return sprintf(buf, "%s\n", dev->ib_dev->name);
701 }
702 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
703
704 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
705 {
706         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
707
708         if (!dev)
709                 return -ENODEV;
710
711         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
712 }
713 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
714
715 static ssize_t show_abi_version(struct class *class, char *buf)
716 {
717         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
718 }
719 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
720
721 static void ib_uverbs_add_one(struct ib_device *device)
722 {
723         struct ib_uverbs_device *uverbs_dev;
724
725         if (!device->alloc_ucontext)
726                 return;
727
728         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
729         if (!uverbs_dev)
730                 return;
731
732         kref_init(&uverbs_dev->ref);
733
734         spin_lock(&map_lock);
735         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
736         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
737                 spin_unlock(&map_lock);
738                 goto err;
739         }
740         set_bit(uverbs_dev->devnum, dev_map);
741         spin_unlock(&map_lock);
742
743         uverbs_dev->ib_dev           = device;
744         uverbs_dev->num_comp_vectors = 1;
745
746         uverbs_dev->dev = cdev_alloc();
747         if (!uverbs_dev->dev)
748                 goto err;
749         uverbs_dev->dev->owner = THIS_MODULE;
750         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
751         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
752         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
753                 goto err_cdev;
754
755         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
756                                                     uverbs_dev->dev->dev,
757                                                     device->dma_device,
758                                                     "uverbs%d", uverbs_dev->devnum);
759         if (IS_ERR(uverbs_dev->class_dev))
760                 goto err_cdev;
761
762         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
763
764         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
765                 goto err_class;
766         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
767                 goto err_class;
768
769         spin_lock(&map_lock);
770         dev_table[uverbs_dev->devnum] = uverbs_dev;
771         spin_unlock(&map_lock);
772
773         ib_set_client_data(device, &uverbs_client, uverbs_dev);
774
775         return;
776
777 err_class:
778         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
779
780 err_cdev:
781         cdev_del(uverbs_dev->dev);
782         clear_bit(uverbs_dev->devnum, dev_map);
783
784 err:
785         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
786         return;
787 }
788
789 static void ib_uverbs_remove_one(struct ib_device *device)
790 {
791         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
792
793         if (!uverbs_dev)
794                 return;
795
796         class_set_devdata(uverbs_dev->class_dev, NULL);
797         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
798         cdev_del(uverbs_dev->dev);
799
800         spin_lock(&map_lock);
801         dev_table[uverbs_dev->devnum] = NULL;
802         spin_unlock(&map_lock);
803
804         clear_bit(uverbs_dev->devnum, dev_map);
805         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
806 }
807
808 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
809                                                const char *dev_name, void *data)
810 {
811         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
812                              INFINIBANDEVENTFS_MAGIC);
813 }
814
815 static struct file_system_type uverbs_event_fs = {
816         /* No owner field so module can be unloaded */
817         .name    = "infinibandeventfs",
818         .get_sb  = uverbs_event_get_sb,
819         .kill_sb = kill_litter_super
820 };
821
822 static int __init ib_uverbs_init(void)
823 {
824         int ret;
825
826         spin_lock_init(&map_lock);
827
828         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
829                                      "infiniband_verbs");
830         if (ret) {
831                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
832                 goto out;
833         }
834
835         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
836         if (IS_ERR(uverbs_class)) {
837                 ret = PTR_ERR(uverbs_class);
838                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
839                 goto out_chrdev;
840         }
841
842         ret = class_create_file(uverbs_class, &class_attr_abi_version);
843         if (ret) {
844                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
845                 goto out_class;
846         }
847
848         ret = register_filesystem(&uverbs_event_fs);
849         if (ret) {
850                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
851                 goto out_class;
852         }
853
854         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
855         if (IS_ERR(uverbs_event_mnt)) {
856                 ret = PTR_ERR(uverbs_event_mnt);
857                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
858                 goto out_fs;
859         }
860
861         ret = ib_register_client(&uverbs_client);
862         if (ret) {
863                 printk(KERN_ERR "user_verbs: couldn't register client\n");
864                 goto out_mnt;
865         }
866
867         return 0;
868
869 out_mnt:
870         mntput(uverbs_event_mnt);
871
872 out_fs:
873         unregister_filesystem(&uverbs_event_fs);
874
875 out_class:
876         class_destroy(uverbs_class);
877
878 out_chrdev:
879         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
880
881 out:
882         return ret;
883 }
884
885 static void __exit ib_uverbs_cleanup(void)
886 {
887         ib_unregister_client(&uverbs_client);
888         mntput(uverbs_event_mnt);
889         unregister_filesystem(&uverbs_event_fs);
890         class_destroy(uverbs_class);
891         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
892         idr_destroy(&ib_uverbs_pd_idr);
893         idr_destroy(&ib_uverbs_mr_idr);
894         idr_destroy(&ib_uverbs_mw_idr);
895         idr_destroy(&ib_uverbs_ah_idr);
896         idr_destroy(&ib_uverbs_cq_idr);
897         idr_destroy(&ib_uverbs_qp_idr);
898         idr_destroy(&ib_uverbs_srq_idr);
899 }
900
901 module_init(ib_uverbs_init);
902 module_exit(ib_uverbs_cleanup);