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IB/mthca: Make all device methods truly reentrant
[linux-2.6.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  * $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_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_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         kfree(dev);
126 }
127
128 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
129                           struct ib_uverbs_event_file *ev_file,
130                           struct ib_ucq_object *uobj)
131 {
132         struct ib_uverbs_event *evt, *tmp;
133
134         if (ev_file) {
135                 spin_lock_irq(&ev_file->lock);
136                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
137                         list_del(&evt->list);
138                         kfree(evt);
139                 }
140                 spin_unlock_irq(&ev_file->lock);
141
142                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
143         }
144
145         spin_lock_irq(&file->async_file->lock);
146         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
147                 list_del(&evt->list);
148                 kfree(evt);
149         }
150         spin_unlock_irq(&file->async_file->lock);
151 }
152
153 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
154                               struct ib_uevent_object *uobj)
155 {
156         struct ib_uverbs_event *evt, *tmp;
157
158         spin_lock_irq(&file->async_file->lock);
159         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
160                 list_del(&evt->list);
161                 kfree(evt);
162         }
163         spin_unlock_irq(&file->async_file->lock);
164 }
165
166 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
167                                     struct ib_uqp_object *uobj)
168 {
169         struct ib_uverbs_mcast_entry *mcast, *tmp;
170
171         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
172                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
173                 list_del(&mcast->list);
174                 kfree(mcast);
175         }
176 }
177
178 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
179                                       struct ib_ucontext *context)
180 {
181         struct ib_uobject *uobj, *tmp;
182
183         if (!context)
184                 return 0;
185
186         mutex_lock(&ib_uverbs_idr_mutex);
187
188         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
189                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
190                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
191                 ib_destroy_ah(ah);
192                 list_del(&uobj->list);
193                 kfree(uobj);
194         }
195
196         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
197                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
198                 struct ib_uqp_object *uqp =
199                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
200                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
201                 ib_uverbs_detach_umcast(qp, uqp);
202                 ib_destroy_qp(qp);
203                 list_del(&uobj->list);
204                 ib_uverbs_release_uevent(file, &uqp->uevent);
205                 kfree(uqp);
206         }
207
208         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
209                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
210                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
211                 struct ib_ucq_object *ucq =
212                         container_of(uobj, struct ib_ucq_object, uobject);
213                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
214                 ib_destroy_cq(cq);
215                 list_del(&uobj->list);
216                 ib_uverbs_release_ucq(file, ev_file, ucq);
217                 kfree(ucq);
218         }
219
220         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
221                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
222                 struct ib_uevent_object *uevent =
223                         container_of(uobj, struct ib_uevent_object, uobject);
224                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
225                 ib_destroy_srq(srq);
226                 list_del(&uobj->list);
227                 ib_uverbs_release_uevent(file, uevent);
228                 kfree(uevent);
229         }
230
231         /* XXX Free MWs */
232
233         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
234                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
235                 struct ib_device *mrdev = mr->device;
236                 struct ib_umem_object *memobj;
237
238                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
239                 ib_dereg_mr(mr);
240
241                 memobj = container_of(uobj, struct ib_umem_object, uobject);
242                 ib_umem_release_on_close(mrdev, &memobj->umem);
243
244                 list_del(&uobj->list);
245                 kfree(memobj);
246         }
247
248         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
249                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
250                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
251                 ib_dealloc_pd(pd);
252                 list_del(&uobj->list);
253                 kfree(uobj);
254         }
255
256         mutex_unlock(&ib_uverbs_idr_mutex);
257
258         return context->device->dealloc_ucontext(context);
259 }
260
261 static void ib_uverbs_release_file(struct kref *ref)
262 {
263         struct ib_uverbs_file *file =
264                 container_of(ref, struct ib_uverbs_file, ref);
265
266         module_put(file->device->ib_dev->owner);
267         kref_put(&file->device->ref, ib_uverbs_release_dev);
268
269         kfree(file);
270 }
271
272 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
273                                     size_t count, loff_t *pos)
274 {
275         struct ib_uverbs_event_file *file = filp->private_data;
276         struct ib_uverbs_event *event;
277         int eventsz;
278         int ret = 0;
279
280         spin_lock_irq(&file->lock);
281
282         while (list_empty(&file->event_list)) {
283                 spin_unlock_irq(&file->lock);
284
285                 if (filp->f_flags & O_NONBLOCK)
286                         return -EAGAIN;
287
288                 if (wait_event_interruptible(file->poll_wait,
289                                              !list_empty(&file->event_list)))
290                         return -ERESTARTSYS;
291
292                 spin_lock_irq(&file->lock);
293         }
294
295         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
296
297         if (file->is_async)
298                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
299         else
300                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
301
302         if (eventsz > count) {
303                 ret   = -EINVAL;
304                 event = NULL;
305         } else {
306                 list_del(file->event_list.next);
307                 if (event->counter) {
308                         ++(*event->counter);
309                         list_del(&event->obj_list);
310                 }
311         }
312
313         spin_unlock_irq(&file->lock);
314
315         if (event) {
316                 if (copy_to_user(buf, event, eventsz))
317                         ret = -EFAULT;
318                 else
319                         ret = eventsz;
320         }
321
322         kfree(event);
323
324         return ret;
325 }
326
327 static unsigned int ib_uverbs_event_poll(struct file *filp,
328                                          struct poll_table_struct *wait)
329 {
330         unsigned int pollflags = 0;
331         struct ib_uverbs_event_file *file = filp->private_data;
332
333         poll_wait(filp, &file->poll_wait, wait);
334
335         spin_lock_irq(&file->lock);
336         if (!list_empty(&file->event_list))
337                 pollflags = POLLIN | POLLRDNORM;
338         spin_unlock_irq(&file->lock);
339
340         return pollflags;
341 }
342
343 void ib_uverbs_release_event_file(struct kref *ref)
344 {
345         struct ib_uverbs_event_file *file =
346                 container_of(ref, struct ib_uverbs_event_file, ref);
347
348         kfree(file);
349 }
350
351 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
352 {
353         struct ib_uverbs_event_file *file = filp->private_data;
354
355         return fasync_helper(fd, filp, on, &file->async_queue);
356 }
357
358 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
359 {
360         struct ib_uverbs_event_file *file = filp->private_data;
361         struct ib_uverbs_event *entry, *tmp;
362
363         spin_lock_irq(&file->lock);
364         file->file = NULL;
365         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
366                 if (entry->counter)
367                         list_del(&entry->obj_list);
368                 kfree(entry);
369         }
370         spin_unlock_irq(&file->lock);
371
372         ib_uverbs_event_fasync(-1, filp, 0);
373
374         if (file->is_async) {
375                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
376                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
377         }
378         kref_put(&file->ref, ib_uverbs_release_event_file);
379
380         return 0;
381 }
382
383 static struct file_operations uverbs_event_fops = {
384         .owner   = THIS_MODULE,
385         .read    = ib_uverbs_event_read,
386         .poll    = ib_uverbs_event_poll,
387         .release = ib_uverbs_event_close,
388         .fasync  = ib_uverbs_event_fasync
389 };
390
391 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
392 {
393         struct ib_uverbs_event_file    *file = cq_context;
394         struct ib_ucq_object           *uobj;
395         struct ib_uverbs_event         *entry;
396         unsigned long                   flags;
397
398         if (!file)
399                 return;
400
401         spin_lock_irqsave(&file->lock, flags);
402         if (!file->file) {
403                 spin_unlock_irqrestore(&file->lock, flags);
404                 return;
405         }
406
407         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
408         if (!entry) {
409                 spin_unlock_irqrestore(&file->lock, flags);
410                 return;
411         }
412
413         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
414
415         entry->desc.comp.cq_handle = cq->uobject->user_handle;
416         entry->counter             = &uobj->comp_events_reported;
417
418         list_add_tail(&entry->list, &file->event_list);
419         list_add_tail(&entry->obj_list, &uobj->comp_list);
420         spin_unlock_irqrestore(&file->lock, flags);
421
422         wake_up_interruptible(&file->poll_wait);
423         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
424 }
425
426 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
427                                     __u64 element, __u64 event,
428                                     struct list_head *obj_list,
429                                     u32 *counter)
430 {
431         struct ib_uverbs_event *entry;
432         unsigned long flags;
433
434         spin_lock_irqsave(&file->async_file->lock, flags);
435         if (!file->async_file->file) {
436                 spin_unlock_irqrestore(&file->async_file->lock, flags);
437                 return;
438         }
439
440         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
441         if (!entry) {
442                 spin_unlock_irqrestore(&file->async_file->lock, flags);
443                 return;
444         }
445
446         entry->desc.async.element    = element;
447         entry->desc.async.event_type = event;
448         entry->counter               = counter;
449
450         list_add_tail(&entry->list, &file->async_file->event_list);
451         if (obj_list)
452                 list_add_tail(&entry->obj_list, obj_list);
453         spin_unlock_irqrestore(&file->async_file->lock, flags);
454
455         wake_up_interruptible(&file->async_file->poll_wait);
456         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
457 }
458
459 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
460 {
461         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
462                                                   struct ib_ucq_object, uobject);
463
464         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
465                                 event->event, &uobj->async_list,
466                                 &uobj->async_events_reported);
467 }
468
469 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
470 {
471         struct ib_uevent_object *uobj;
472
473         uobj = container_of(event->element.qp->uobject,
474                             struct ib_uevent_object, uobject);
475
476         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
477                                 event->event, &uobj->event_list,
478                                 &uobj->events_reported);
479 }
480
481 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
482 {
483         struct ib_uevent_object *uobj;
484
485         uobj = container_of(event->element.srq->uobject,
486                             struct ib_uevent_object, uobject);
487
488         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
489                                 event->event, &uobj->event_list,
490                                 &uobj->events_reported);
491 }
492
493 void ib_uverbs_event_handler(struct ib_event_handler *handler,
494                              struct ib_event *event)
495 {
496         struct ib_uverbs_file *file =
497                 container_of(handler, struct ib_uverbs_file, event_handler);
498
499         ib_uverbs_async_handler(file, event->element.port_num, event->event,
500                                 NULL, NULL);
501 }
502
503 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
504                                         int is_async, int *fd)
505 {
506         struct ib_uverbs_event_file *ev_file;
507         struct file *filp;
508         int ret;
509
510         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
511         if (!ev_file)
512                 return ERR_PTR(-ENOMEM);
513
514         kref_init(&ev_file->ref);
515         spin_lock_init(&ev_file->lock);
516         INIT_LIST_HEAD(&ev_file->event_list);
517         init_waitqueue_head(&ev_file->poll_wait);
518         ev_file->uverbs_file = uverbs_file;
519         ev_file->async_queue = NULL;
520         ev_file->is_async    = is_async;
521
522         *fd = get_unused_fd();
523         if (*fd < 0) {
524                 ret = *fd;
525                 goto err;
526         }
527
528         filp = get_empty_filp();
529         if (!filp) {
530                 ret = -ENFILE;
531                 goto err_fd;
532         }
533
534         ev_file->file      = filp;
535
536         /*
537          * fops_get() can't fail here, because we're coming from a
538          * system call on a uverbs file, which will already have a
539          * module reference.
540          */
541         filp->f_op         = fops_get(&uverbs_event_fops);
542         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
543         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
544         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
545         filp->f_flags      = O_RDONLY;
546         filp->f_mode       = FMODE_READ;
547         filp->private_data = ev_file;
548
549         return filp;
550
551 err_fd:
552         put_unused_fd(*fd);
553
554 err:
555         kfree(ev_file);
556         return ERR_PTR(ret);
557 }
558
559 /*
560  * Look up a completion event file by FD.  If lookup is successful,
561  * takes a ref to the event file struct that it returns; if
562  * unsuccessful, returns NULL.
563  */
564 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
565 {
566         struct ib_uverbs_event_file *ev_file = NULL;
567         struct file *filp;
568
569         filp = fget(fd);
570         if (!filp)
571                 return NULL;
572
573         if (filp->f_op != &uverbs_event_fops)
574                 goto out;
575
576         ev_file = filp->private_data;
577         if (ev_file->is_async) {
578                 ev_file = NULL;
579                 goto out;
580         }
581
582         kref_get(&ev_file->ref);
583
584 out:
585         fput(filp);
586         return ev_file;
587 }
588
589 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
590                              size_t count, loff_t *pos)
591 {
592         struct ib_uverbs_file *file = filp->private_data;
593         struct ib_uverbs_cmd_hdr hdr;
594
595         if (count < sizeof hdr)
596                 return -EINVAL;
597
598         if (copy_from_user(&hdr, buf, sizeof hdr))
599                 return -EFAULT;
600
601         if (hdr.in_words * 4 != count)
602                 return -EINVAL;
603
604         if (hdr.command < 0                             ||
605             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
606             !uverbs_cmd_table[hdr.command]              ||
607             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
608                 return -EINVAL;
609
610         if (!file->ucontext &&
611             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
612                 return -EINVAL;
613
614         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
615                                              hdr.in_words * 4, hdr.out_words * 4);
616 }
617
618 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
619 {
620         struct ib_uverbs_file *file = filp->private_data;
621
622         if (!file->ucontext)
623                 return -ENODEV;
624         else
625                 return file->device->ib_dev->mmap(file->ucontext, vma);
626 }
627
628 static int ib_uverbs_open(struct inode *inode, struct file *filp)
629 {
630         struct ib_uverbs_device *dev;
631         struct ib_uverbs_file *file;
632         int ret;
633
634         spin_lock(&map_lock);
635         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
636         if (dev)
637                 kref_get(&dev->ref);
638         spin_unlock(&map_lock);
639
640         if (!dev)
641                 return -ENXIO;
642
643         if (!try_module_get(dev->ib_dev->owner)) {
644                 ret = -ENODEV;
645                 goto err;
646         }
647
648         file = kmalloc(sizeof *file, GFP_KERNEL);
649         if (!file) {
650                 ret = -ENOMEM;
651                 goto err_module;
652         }
653
654         file->device     = dev;
655         file->ucontext   = NULL;
656         file->async_file = NULL;
657         kref_init(&file->ref);
658         mutex_init(&file->mutex);
659
660         filp->private_data = file;
661
662         return 0;
663
664 err_module:
665         module_put(dev->ib_dev->owner);
666
667 err:
668         kref_put(&dev->ref, ib_uverbs_release_dev);
669
670         return ret;
671 }
672
673 static int ib_uverbs_close(struct inode *inode, struct file *filp)
674 {
675         struct ib_uverbs_file *file = filp->private_data;
676
677         ib_uverbs_cleanup_ucontext(file, file->ucontext);
678
679         if (file->async_file)
680                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
681
682         kref_put(&file->ref, ib_uverbs_release_file);
683
684         return 0;
685 }
686
687 static struct file_operations uverbs_fops = {
688         .owner   = THIS_MODULE,
689         .write   = ib_uverbs_write,
690         .open    = ib_uverbs_open,
691         .release = ib_uverbs_close
692 };
693
694 static struct file_operations uverbs_mmap_fops = {
695         .owner   = THIS_MODULE,
696         .write   = ib_uverbs_write,
697         .mmap    = ib_uverbs_mmap,
698         .open    = ib_uverbs_open,
699         .release = ib_uverbs_close
700 };
701
702 static struct ib_client uverbs_client = {
703         .name   = "uverbs",
704         .add    = ib_uverbs_add_one,
705         .remove = ib_uverbs_remove_one
706 };
707
708 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
709 {
710         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
711
712         if (!dev)
713                 return -ENODEV;
714
715         return sprintf(buf, "%s\n", dev->ib_dev->name);
716 }
717 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
718
719 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
720 {
721         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
722
723         if (!dev)
724                 return -ENODEV;
725
726         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
727 }
728 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
729
730 static ssize_t show_abi_version(struct class *class, char *buf)
731 {
732         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
733 }
734 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
735
736 static void ib_uverbs_add_one(struct ib_device *device)
737 {
738         struct ib_uverbs_device *uverbs_dev;
739
740         if (!device->alloc_ucontext)
741                 return;
742
743         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
744         if (!uverbs_dev)
745                 return;
746
747         kref_init(&uverbs_dev->ref);
748
749         spin_lock(&map_lock);
750         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
751         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
752                 spin_unlock(&map_lock);
753                 goto err;
754         }
755         set_bit(uverbs_dev->devnum, dev_map);
756         spin_unlock(&map_lock);
757
758         uverbs_dev->ib_dev           = device;
759         uverbs_dev->num_comp_vectors = 1;
760
761         uverbs_dev->dev = cdev_alloc();
762         if (!uverbs_dev->dev)
763                 goto err;
764         uverbs_dev->dev->owner = THIS_MODULE;
765         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
766         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
767         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
768                 goto err_cdev;
769
770         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
771                                                     uverbs_dev->dev->dev,
772                                                     device->dma_device,
773                                                     "uverbs%d", uverbs_dev->devnum);
774         if (IS_ERR(uverbs_dev->class_dev))
775                 goto err_cdev;
776
777         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
778
779         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
780                 goto err_class;
781         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
782                 goto err_class;
783
784         spin_lock(&map_lock);
785         dev_table[uverbs_dev->devnum] = uverbs_dev;
786         spin_unlock(&map_lock);
787
788         ib_set_client_data(device, &uverbs_client, uverbs_dev);
789
790         return;
791
792 err_class:
793         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
794
795 err_cdev:
796         cdev_del(uverbs_dev->dev);
797         clear_bit(uverbs_dev->devnum, dev_map);
798
799 err:
800         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
801         return;
802 }
803
804 static void ib_uverbs_remove_one(struct ib_device *device)
805 {
806         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
807
808         if (!uverbs_dev)
809                 return;
810
811         class_set_devdata(uverbs_dev->class_dev, NULL);
812         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
813         cdev_del(uverbs_dev->dev);
814
815         spin_lock(&map_lock);
816         dev_table[uverbs_dev->devnum] = NULL;
817         spin_unlock(&map_lock);
818
819         clear_bit(uverbs_dev->devnum, dev_map);
820         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
821 }
822
823 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
824                                                const char *dev_name, void *data)
825 {
826         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
827                              INFINIBANDEVENTFS_MAGIC);
828 }
829
830 static struct file_system_type uverbs_event_fs = {
831         /* No owner field so module can be unloaded */
832         .name    = "infinibandeventfs",
833         .get_sb  = uverbs_event_get_sb,
834         .kill_sb = kill_litter_super
835 };
836
837 static int __init ib_uverbs_init(void)
838 {
839         int ret;
840
841         spin_lock_init(&map_lock);
842
843         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
844                                      "infiniband_verbs");
845         if (ret) {
846                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
847                 goto out;
848         }
849
850         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
851         if (IS_ERR(uverbs_class)) {
852                 ret = PTR_ERR(uverbs_class);
853                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
854                 goto out_chrdev;
855         }
856
857         ret = class_create_file(uverbs_class, &class_attr_abi_version);
858         if (ret) {
859                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
860                 goto out_class;
861         }
862
863         ret = register_filesystem(&uverbs_event_fs);
864         if (ret) {
865                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
866                 goto out_class;
867         }
868
869         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
870         if (IS_ERR(uverbs_event_mnt)) {
871                 ret = PTR_ERR(uverbs_event_mnt);
872                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
873                 goto out_fs;
874         }
875
876         ret = ib_register_client(&uverbs_client);
877         if (ret) {
878                 printk(KERN_ERR "user_verbs: couldn't register client\n");
879                 goto out_mnt;
880         }
881
882         return 0;
883
884 out_mnt:
885         mntput(uverbs_event_mnt);
886
887 out_fs:
888         unregister_filesystem(&uverbs_event_fs);
889
890 out_class:
891         class_destroy(uverbs_class);
892
893 out_chrdev:
894         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
895
896 out:
897         return ret;
898 }
899
900 static void __exit ib_uverbs_cleanup(void)
901 {
902         ib_unregister_client(&uverbs_client);
903         mntput(uverbs_event_mnt);
904         unregister_filesystem(&uverbs_event_fs);
905         class_destroy(uverbs_class);
906         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
907         flush_scheduled_work();
908         idr_destroy(&ib_uverbs_pd_idr);
909         idr_destroy(&ib_uverbs_mr_idr);
910         idr_destroy(&ib_uverbs_mw_idr);
911         idr_destroy(&ib_uverbs_ah_idr);
912         idr_destroy(&ib_uverbs_cq_idr);
913         idr_destroy(&ib_uverbs_qp_idr);
914         idr_destroy(&ib_uverbs_srq_idr);
915 }
916
917 module_init(ib_uverbs_init);
918 module_exit(ib_uverbs_cleanup);