Merge branch 'misc' into for-next
[linux-3.10.git] / drivers / infiniband / core / uverbs_main.c
1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7  *
8  * This software is available to you under a choice of one of two
9  * licenses.  You may choose to be licensed under the terms of the GNU
10  * General Public License (GPL) Version 2, available from the file
11  * COPYING in the main directory of this source tree, or the
12  * OpenIB.org BSD license below:
13  *
14  *     Redistribution and use in source and binary forms, with or
15  *     without modification, are permitted provided that the following
16  *     conditions are met:
17  *
18  *      - Redistributions of source code must retain the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer.
21  *
22  *      - Redistributions in binary form must reproduce the above
23  *        copyright notice, this list of conditions and the following
24  *        disclaimer in the documentation and/or other materials
25  *        provided with the distribution.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34  * SOFTWARE.
35  */
36
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/device.h>
40 #include <linux/err.h>
41 #include <linux/fs.h>
42 #include <linux/poll.h>
43 #include <linux/sched.h>
44 #include <linux/file.h>
45 #include <linux/cdev.h>
46 #include <linux/anon_inodes.h>
47
48 #include <asm/uaccess.h>
49
50 #include "uverbs.h"
51
52 MODULE_AUTHOR("Roland Dreier");
53 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
54 MODULE_LICENSE("Dual BSD/GPL");
55
56 enum {
57         IB_UVERBS_MAJOR       = 231,
58         IB_UVERBS_BASE_MINOR  = 192,
59         IB_UVERBS_MAX_DEVICES = 32
60 };
61
62 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
63
64 static struct class *uverbs_class;
65
66 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
67 DEFINE_IDR(ib_uverbs_pd_idr);
68 DEFINE_IDR(ib_uverbs_mr_idr);
69 DEFINE_IDR(ib_uverbs_mw_idr);
70 DEFINE_IDR(ib_uverbs_ah_idr);
71 DEFINE_IDR(ib_uverbs_cq_idr);
72 DEFINE_IDR(ib_uverbs_qp_idr);
73 DEFINE_IDR(ib_uverbs_srq_idr);
74
75 static DEFINE_SPINLOCK(map_lock);
76 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
77
78 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
79                                      const char __user *buf, int in_len,
80                                      int out_len) = {
81         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
82         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
83         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
84         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
85         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
86         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
87         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
88         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
89         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
90         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
91         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
92         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
93         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
94         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
95         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
96         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
97         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
98         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
99         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
100         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
101         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
102         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
103         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
104         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
105         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
106         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
107         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
108         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
109 };
110
111 static void ib_uverbs_add_one(struct ib_device *device);
112 static void ib_uverbs_remove_one(struct ib_device *device);
113
114 static void ib_uverbs_release_dev(struct kref *ref)
115 {
116         struct ib_uverbs_device *dev =
117                 container_of(ref, struct ib_uverbs_device, ref);
118
119         complete(&dev->comp);
120 }
121
122 static void ib_uverbs_release_event_file(struct kref *ref)
123 {
124         struct ib_uverbs_event_file *file =
125                 container_of(ref, struct ib_uverbs_event_file, ref);
126
127         kfree(file);
128 }
129
130 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
131                           struct ib_uverbs_event_file *ev_file,
132                           struct ib_ucq_object *uobj)
133 {
134         struct ib_uverbs_event *evt, *tmp;
135
136         if (ev_file) {
137                 spin_lock_irq(&ev_file->lock);
138                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
139                         list_del(&evt->list);
140                         kfree(evt);
141                 }
142                 spin_unlock_irq(&ev_file->lock);
143
144                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
145         }
146
147         spin_lock_irq(&file->async_file->lock);
148         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
149                 list_del(&evt->list);
150                 kfree(evt);
151         }
152         spin_unlock_irq(&file->async_file->lock);
153 }
154
155 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
156                               struct ib_uevent_object *uobj)
157 {
158         struct ib_uverbs_event *evt, *tmp;
159
160         spin_lock_irq(&file->async_file->lock);
161         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
162                 list_del(&evt->list);
163                 kfree(evt);
164         }
165         spin_unlock_irq(&file->async_file->lock);
166 }
167
168 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
169                                     struct ib_uqp_object *uobj)
170 {
171         struct ib_uverbs_mcast_entry *mcast, *tmp;
172
173         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
174                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
175                 list_del(&mcast->list);
176                 kfree(mcast);
177         }
178 }
179
180 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
181                                       struct ib_ucontext *context)
182 {
183         struct ib_uobject *uobj, *tmp;
184
185         if (!context)
186                 return 0;
187
188         context->closing = 1;
189
190         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
191                 struct ib_ah *ah = uobj->object;
192
193                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
194                 ib_destroy_ah(ah);
195                 kfree(uobj);
196         }
197
198         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
199                 struct ib_qp *qp = uobj->object;
200                 struct ib_uqp_object *uqp =
201                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
202
203                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
204                 ib_uverbs_detach_umcast(qp, uqp);
205                 ib_destroy_qp(qp);
206                 ib_uverbs_release_uevent(file, &uqp->uevent);
207                 kfree(uqp);
208         }
209
210         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
211                 struct ib_cq *cq = uobj->object;
212                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
213                 struct ib_ucq_object *ucq =
214                         container_of(uobj, struct ib_ucq_object, uobject);
215
216                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
217                 ib_destroy_cq(cq);
218                 ib_uverbs_release_ucq(file, ev_file, ucq);
219                 kfree(ucq);
220         }
221
222         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
223                 struct ib_srq *srq = uobj->object;
224                 struct ib_uevent_object *uevent =
225                         container_of(uobj, struct ib_uevent_object, uobject);
226
227                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
228                 ib_destroy_srq(srq);
229                 ib_uverbs_release_uevent(file, uevent);
230                 kfree(uevent);
231         }
232
233         /* XXX Free MWs */
234
235         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
236                 struct ib_mr *mr = uobj->object;
237
238                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
239                 ib_dereg_mr(mr);
240                 kfree(uobj);
241         }
242
243         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
244                 struct ib_pd *pd = uobj->object;
245
246                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
247                 ib_dealloc_pd(pd);
248                 kfree(uobj);
249         }
250
251         return context->device->dealloc_ucontext(context);
252 }
253
254 static void ib_uverbs_release_file(struct kref *ref)
255 {
256         struct ib_uverbs_file *file =
257                 container_of(ref, struct ib_uverbs_file, ref);
258
259         module_put(file->device->ib_dev->owner);
260         kref_put(&file->device->ref, ib_uverbs_release_dev);
261
262         kfree(file);
263 }
264
265 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
266                                     size_t count, loff_t *pos)
267 {
268         struct ib_uverbs_event_file *file = filp->private_data;
269         struct ib_uverbs_event *event;
270         int eventsz;
271         int ret = 0;
272
273         spin_lock_irq(&file->lock);
274
275         while (list_empty(&file->event_list)) {
276                 spin_unlock_irq(&file->lock);
277
278                 if (filp->f_flags & O_NONBLOCK)
279                         return -EAGAIN;
280
281                 if (wait_event_interruptible(file->poll_wait,
282                                              !list_empty(&file->event_list)))
283                         return -ERESTARTSYS;
284
285                 spin_lock_irq(&file->lock);
286         }
287
288         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
289
290         if (file->is_async)
291                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
292         else
293                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
294
295         if (eventsz > count) {
296                 ret   = -EINVAL;
297                 event = NULL;
298         } else {
299                 list_del(file->event_list.next);
300                 if (event->counter) {
301                         ++(*event->counter);
302                         list_del(&event->obj_list);
303                 }
304         }
305
306         spin_unlock_irq(&file->lock);
307
308         if (event) {
309                 if (copy_to_user(buf, event, eventsz))
310                         ret = -EFAULT;
311                 else
312                         ret = eventsz;
313         }
314
315         kfree(event);
316
317         return ret;
318 }
319
320 static unsigned int ib_uverbs_event_poll(struct file *filp,
321                                          struct poll_table_struct *wait)
322 {
323         unsigned int pollflags = 0;
324         struct ib_uverbs_event_file *file = filp->private_data;
325
326         poll_wait(filp, &file->poll_wait, wait);
327
328         spin_lock_irq(&file->lock);
329         if (!list_empty(&file->event_list))
330                 pollflags = POLLIN | POLLRDNORM;
331         spin_unlock_irq(&file->lock);
332
333         return pollflags;
334 }
335
336 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
337 {
338         struct ib_uverbs_event_file *file = filp->private_data;
339
340         return fasync_helper(fd, filp, on, &file->async_queue);
341 }
342
343 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
344 {
345         struct ib_uverbs_event_file *file = filp->private_data;
346         struct ib_uverbs_event *entry, *tmp;
347
348         spin_lock_irq(&file->lock);
349         file->is_closed = 1;
350         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
351                 if (entry->counter)
352                         list_del(&entry->obj_list);
353                 kfree(entry);
354         }
355         spin_unlock_irq(&file->lock);
356
357         if (file->is_async) {
358                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
359                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
360         }
361         kref_put(&file->ref, ib_uverbs_release_event_file);
362
363         return 0;
364 }
365
366 static const struct file_operations uverbs_event_fops = {
367         .owner   = THIS_MODULE,
368         .read    = ib_uverbs_event_read,
369         .poll    = ib_uverbs_event_poll,
370         .release = ib_uverbs_event_close,
371         .fasync  = ib_uverbs_event_fasync
372 };
373
374 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
375 {
376         struct ib_uverbs_event_file    *file = cq_context;
377         struct ib_ucq_object           *uobj;
378         struct ib_uverbs_event         *entry;
379         unsigned long                   flags;
380
381         if (!file)
382                 return;
383
384         spin_lock_irqsave(&file->lock, flags);
385         if (file->is_closed) {
386                 spin_unlock_irqrestore(&file->lock, flags);
387                 return;
388         }
389
390         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
391         if (!entry) {
392                 spin_unlock_irqrestore(&file->lock, flags);
393                 return;
394         }
395
396         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
397
398         entry->desc.comp.cq_handle = cq->uobject->user_handle;
399         entry->counter             = &uobj->comp_events_reported;
400
401         list_add_tail(&entry->list, &file->event_list);
402         list_add_tail(&entry->obj_list, &uobj->comp_list);
403         spin_unlock_irqrestore(&file->lock, flags);
404
405         wake_up_interruptible(&file->poll_wait);
406         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
407 }
408
409 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
410                                     __u64 element, __u64 event,
411                                     struct list_head *obj_list,
412                                     u32 *counter)
413 {
414         struct ib_uverbs_event *entry;
415         unsigned long flags;
416
417         spin_lock_irqsave(&file->async_file->lock, flags);
418         if (file->async_file->is_closed) {
419                 spin_unlock_irqrestore(&file->async_file->lock, flags);
420                 return;
421         }
422
423         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
424         if (!entry) {
425                 spin_unlock_irqrestore(&file->async_file->lock, flags);
426                 return;
427         }
428
429         entry->desc.async.element    = element;
430         entry->desc.async.event_type = event;
431         entry->counter               = counter;
432
433         list_add_tail(&entry->list, &file->async_file->event_list);
434         if (obj_list)
435                 list_add_tail(&entry->obj_list, obj_list);
436         spin_unlock_irqrestore(&file->async_file->lock, flags);
437
438         wake_up_interruptible(&file->async_file->poll_wait);
439         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
440 }
441
442 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
443 {
444         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
445                                                   struct ib_ucq_object, uobject);
446
447         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
448                                 event->event, &uobj->async_list,
449                                 &uobj->async_events_reported);
450 }
451
452 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
453 {
454         struct ib_uevent_object *uobj;
455
456         uobj = container_of(event->element.qp->uobject,
457                             struct ib_uevent_object, uobject);
458
459         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
460                                 event->event, &uobj->event_list,
461                                 &uobj->events_reported);
462 }
463
464 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
465 {
466         struct ib_uevent_object *uobj;
467
468         uobj = container_of(event->element.srq->uobject,
469                             struct ib_uevent_object, uobject);
470
471         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
472                                 event->event, &uobj->event_list,
473                                 &uobj->events_reported);
474 }
475
476 void ib_uverbs_event_handler(struct ib_event_handler *handler,
477                              struct ib_event *event)
478 {
479         struct ib_uverbs_file *file =
480                 container_of(handler, struct ib_uverbs_file, event_handler);
481
482         ib_uverbs_async_handler(file, event->element.port_num, event->event,
483                                 NULL, NULL);
484 }
485
486 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
487                                         int is_async, int *fd)
488 {
489         struct ib_uverbs_event_file *ev_file;
490         struct file *filp;
491         int ret;
492
493         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
494         if (!ev_file)
495                 return ERR_PTR(-ENOMEM);
496
497         kref_init(&ev_file->ref);
498         spin_lock_init(&ev_file->lock);
499         INIT_LIST_HEAD(&ev_file->event_list);
500         init_waitqueue_head(&ev_file->poll_wait);
501         ev_file->uverbs_file = uverbs_file;
502         ev_file->async_queue = NULL;
503         ev_file->is_async    = is_async;
504         ev_file->is_closed   = 0;
505
506         *fd = get_unused_fd();
507         if (*fd < 0) {
508                 ret = *fd;
509                 goto err;
510         }
511
512         filp = anon_inode_getfile("[uverbs-event]", &uverbs_event_fops,
513                                   ev_file, O_RDONLY);
514         if (!filp) {
515                 ret = -ENFILE;
516                 goto err_fd;
517         }
518
519         return filp;
520
521 err_fd:
522         put_unused_fd(*fd);
523
524 err:
525         kfree(ev_file);
526         return ERR_PTR(ret);
527 }
528
529 /*
530  * Look up a completion event file by FD.  If lookup is successful,
531  * takes a ref to the event file struct that it returns; if
532  * unsuccessful, returns NULL.
533  */
534 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
535 {
536         struct ib_uverbs_event_file *ev_file = NULL;
537         struct file *filp;
538
539         filp = fget(fd);
540         if (!filp)
541                 return NULL;
542
543         if (filp->f_op != &uverbs_event_fops)
544                 goto out;
545
546         ev_file = filp->private_data;
547         if (ev_file->is_async) {
548                 ev_file = NULL;
549                 goto out;
550         }
551
552         kref_get(&ev_file->ref);
553
554 out:
555         fput(filp);
556         return ev_file;
557 }
558
559 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
560                              size_t count, loff_t *pos)
561 {
562         struct ib_uverbs_file *file = filp->private_data;
563         struct ib_uverbs_cmd_hdr hdr;
564
565         if (count < sizeof hdr)
566                 return -EINVAL;
567
568         if (copy_from_user(&hdr, buf, sizeof hdr))
569                 return -EFAULT;
570
571         if (hdr.in_words * 4 != count)
572                 return -EINVAL;
573
574         if (hdr.command < 0                             ||
575             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
576             !uverbs_cmd_table[hdr.command])
577                 return -EINVAL;
578
579         if (!file->ucontext &&
580             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
581                 return -EINVAL;
582
583         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
584                 return -ENOSYS;
585
586         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
587                                              hdr.in_words * 4, hdr.out_words * 4);
588 }
589
590 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
591 {
592         struct ib_uverbs_file *file = filp->private_data;
593
594         if (!file->ucontext)
595                 return -ENODEV;
596         else
597                 return file->device->ib_dev->mmap(file->ucontext, vma);
598 }
599
600 /*
601  * ib_uverbs_open() does not need the BKL:
602  *
603  *  - the ib_uverbs_device structures are properly reference counted and
604  *    everything else is purely local to the file being created, so
605  *    races against other open calls are not a problem;
606  *  - there is no ioctl method to race against;
607  *  - the open method will either immediately run -ENXIO, or all
608  *    required initialization will be done.
609  */
610 static int ib_uverbs_open(struct inode *inode, struct file *filp)
611 {
612         struct ib_uverbs_device *dev;
613         struct ib_uverbs_file *file;
614         int ret;
615
616         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
617         if (dev)
618                 kref_get(&dev->ref);
619         else
620                 return -ENXIO;
621
622         if (!try_module_get(dev->ib_dev->owner)) {
623                 ret = -ENODEV;
624                 goto err;
625         }
626
627         file = kmalloc(sizeof *file, GFP_KERNEL);
628         if (!file) {
629                 ret = -ENOMEM;
630                 goto err_module;
631         }
632
633         file->device     = dev;
634         file->ucontext   = NULL;
635         file->async_file = NULL;
636         kref_init(&file->ref);
637         mutex_init(&file->mutex);
638
639         filp->private_data = file;
640
641         return 0;
642
643 err_module:
644         module_put(dev->ib_dev->owner);
645
646 err:
647         kref_put(&dev->ref, ib_uverbs_release_dev);
648         return ret;
649 }
650
651 static int ib_uverbs_close(struct inode *inode, struct file *filp)
652 {
653         struct ib_uverbs_file *file = filp->private_data;
654
655         ib_uverbs_cleanup_ucontext(file, file->ucontext);
656
657         if (file->async_file)
658                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
659
660         kref_put(&file->ref, ib_uverbs_release_file);
661
662         return 0;
663 }
664
665 static const struct file_operations uverbs_fops = {
666         .owner   = THIS_MODULE,
667         .write   = ib_uverbs_write,
668         .open    = ib_uverbs_open,
669         .release = ib_uverbs_close
670 };
671
672 static const struct file_operations uverbs_mmap_fops = {
673         .owner   = THIS_MODULE,
674         .write   = ib_uverbs_write,
675         .mmap    = ib_uverbs_mmap,
676         .open    = ib_uverbs_open,
677         .release = ib_uverbs_close
678 };
679
680 static struct ib_client uverbs_client = {
681         .name   = "uverbs",
682         .add    = ib_uverbs_add_one,
683         .remove = ib_uverbs_remove_one
684 };
685
686 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
687                           char *buf)
688 {
689         struct ib_uverbs_device *dev = dev_get_drvdata(device);
690
691         if (!dev)
692                 return -ENODEV;
693
694         return sprintf(buf, "%s\n", dev->ib_dev->name);
695 }
696 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
697
698 static ssize_t show_dev_abi_version(struct device *device,
699                                     struct device_attribute *attr, char *buf)
700 {
701         struct ib_uverbs_device *dev = dev_get_drvdata(device);
702
703         if (!dev)
704                 return -ENODEV;
705
706         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
707 }
708 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
709
710 static ssize_t show_abi_version(struct class *class, char *buf)
711 {
712         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
713 }
714 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
715
716 static dev_t overflow_maj;
717 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
718
719 /*
720  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
721  * requesting a new major number and doubling the number of max devices we
722  * support. It's stupid, but simple.
723  */
724 static int find_overflow_devnum(void)
725 {
726         int ret;
727
728         if (!overflow_maj) {
729                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
730                                           "infiniband_verbs");
731                 if (ret) {
732                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
733                         return ret;
734                 }
735         }
736
737         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
738         if (ret >= IB_UVERBS_MAX_DEVICES)
739                 return -1;
740
741         return ret;
742 }
743
744 static void ib_uverbs_add_one(struct ib_device *device)
745 {
746         int devnum;
747         dev_t base;
748         struct ib_uverbs_device *uverbs_dev;
749
750         if (!device->alloc_ucontext)
751                 return;
752
753         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
754         if (!uverbs_dev)
755                 return;
756
757         kref_init(&uverbs_dev->ref);
758         init_completion(&uverbs_dev->comp);
759
760         spin_lock(&map_lock);
761         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
762         if (devnum >= IB_UVERBS_MAX_DEVICES) {
763                 spin_unlock(&map_lock);
764                 devnum = find_overflow_devnum();
765                 if (devnum < 0)
766                         goto err;
767
768                 spin_lock(&map_lock);
769                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
770                 base = devnum + overflow_maj;
771                 set_bit(devnum, overflow_map);
772         } else {
773                 uverbs_dev->devnum = devnum;
774                 base = devnum + IB_UVERBS_BASE_DEV;
775                 set_bit(devnum, dev_map);
776         }
777         spin_unlock(&map_lock);
778
779         uverbs_dev->ib_dev           = device;
780         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
781
782         cdev_init(&uverbs_dev->cdev, NULL);
783         uverbs_dev->cdev.owner = THIS_MODULE;
784         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
785         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
786         if (cdev_add(&uverbs_dev->cdev, base, 1))
787                 goto err_cdev;
788
789         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
790                                         uverbs_dev->cdev.dev, uverbs_dev,
791                                         "uverbs%d", uverbs_dev->devnum);
792         if (IS_ERR(uverbs_dev->dev))
793                 goto err_cdev;
794
795         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
796                 goto err_class;
797         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
798                 goto err_class;
799
800         ib_set_client_data(device, &uverbs_client, uverbs_dev);
801
802         return;
803
804 err_class:
805         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
806
807 err_cdev:
808         cdev_del(&uverbs_dev->cdev);
809         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
810                 clear_bit(devnum, dev_map);
811         else
812                 clear_bit(devnum, overflow_map);
813
814 err:
815         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
816         wait_for_completion(&uverbs_dev->comp);
817         kfree(uverbs_dev);
818         return;
819 }
820
821 static void ib_uverbs_remove_one(struct ib_device *device)
822 {
823         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
824
825         if (!uverbs_dev)
826                 return;
827
828         dev_set_drvdata(uverbs_dev->dev, NULL);
829         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
830         cdev_del(&uverbs_dev->cdev);
831
832         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
833                 clear_bit(uverbs_dev->devnum, dev_map);
834         else
835                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
836
837         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
838         wait_for_completion(&uverbs_dev->comp);
839         kfree(uverbs_dev);
840 }
841
842 static int __init ib_uverbs_init(void)
843 {
844         int ret;
845
846         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
847                                      "infiniband_verbs");
848         if (ret) {
849                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
850                 goto out;
851         }
852
853         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
854         if (IS_ERR(uverbs_class)) {
855                 ret = PTR_ERR(uverbs_class);
856                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
857                 goto out_chrdev;
858         }
859
860         ret = class_create_file(uverbs_class, &class_attr_abi_version);
861         if (ret) {
862                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
863                 goto out_class;
864         }
865
866         ret = ib_register_client(&uverbs_client);
867         if (ret) {
868                 printk(KERN_ERR "user_verbs: couldn't register client\n");
869                 goto out_class;
870         }
871
872         return 0;
873
874 out_class:
875         class_destroy(uverbs_class);
876
877 out_chrdev:
878         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
879
880 out:
881         return ret;
882 }
883
884 static void __exit ib_uverbs_cleanup(void)
885 {
886         ib_unregister_client(&uverbs_client);
887         class_destroy(uverbs_class);
888         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
889         if (overflow_maj)
890                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
891         idr_destroy(&ib_uverbs_pd_idr);
892         idr_destroy(&ib_uverbs_mr_idr);
893         idr_destroy(&ib_uverbs_mw_idr);
894         idr_destroy(&ib_uverbs_ah_idr);
895         idr_destroy(&ib_uverbs_cq_idr);
896         idr_destroy(&ib_uverbs_qp_idr);
897         idr_destroy(&ib_uverbs_srq_idr);
898 }
899
900 module_init(ib_uverbs_init);
901 module_exit(ib_uverbs_cleanup);