[PATCH] struct path: convert infiniband
[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_SPINLOCK(ib_uverbs_idr_lock);
70 DEFINE_IDR(ib_uverbs_pd_idr);
71 DEFINE_IDR(ib_uverbs_mr_idr);
72 DEFINE_IDR(ib_uverbs_mw_idr);
73 DEFINE_IDR(ib_uverbs_ah_idr);
74 DEFINE_IDR(ib_uverbs_cq_idr);
75 DEFINE_IDR(ib_uverbs_qp_idr);
76 DEFINE_IDR(ib_uverbs_srq_idr);
77
78 static spinlock_t map_lock;
79 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
80 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
81
82 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
83                                      const char __user *buf, int in_len,
84                                      int out_len) = {
85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
91         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
92         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
93         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
94         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
95         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
96         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
97         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
98         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
99         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
100         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
101         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
102         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
103         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
104         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
105         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
106         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
107         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
108         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
109         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
110         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
111         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
112         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
113 };
114
115 static struct vfsmount *uverbs_event_mnt;
116
117 static void ib_uverbs_add_one(struct ib_device *device);
118 static void ib_uverbs_remove_one(struct ib_device *device);
119
120 static void ib_uverbs_release_dev(struct kref *ref)
121 {
122         struct ib_uverbs_device *dev =
123                 container_of(ref, struct ib_uverbs_device, ref);
124
125         complete(&dev->comp);
126 }
127
128 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         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
187                 struct ib_ah *ah = uobj->object;
188
189                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
190                 ib_destroy_ah(ah);
191                 kfree(uobj);
192         }
193
194         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
195                 struct ib_qp *qp = uobj->object;
196                 struct ib_uqp_object *uqp =
197                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
198
199                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
200                 ib_uverbs_detach_umcast(qp, uqp);
201                 ib_destroy_qp(qp);
202                 ib_uverbs_release_uevent(file, &uqp->uevent);
203                 kfree(uqp);
204         }
205
206         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
207                 struct ib_cq *cq = uobj->object;
208                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
209                 struct ib_ucq_object *ucq =
210                         container_of(uobj, struct ib_ucq_object, uobject);
211
212                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
213                 ib_destroy_cq(cq);
214                 ib_uverbs_release_ucq(file, ev_file, ucq);
215                 kfree(ucq);
216         }
217
218         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
219                 struct ib_srq *srq = uobj->object;
220                 struct ib_uevent_object *uevent =
221                         container_of(uobj, struct ib_uevent_object, uobject);
222
223                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
224                 ib_destroy_srq(srq);
225                 ib_uverbs_release_uevent(file, uevent);
226                 kfree(uevent);
227         }
228
229         /* XXX Free MWs */
230
231         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
232                 struct ib_mr *mr = uobj->object;
233                 struct ib_device *mrdev = mr->device;
234                 struct ib_umem_object *memobj;
235
236                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
237                 ib_dereg_mr(mr);
238
239                 memobj = container_of(uobj, struct ib_umem_object, uobject);
240                 ib_umem_release_on_close(mrdev, &memobj->umem);
241
242                 kfree(memobj);
243         }
244
245         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
246                 struct ib_pd *pd = uobj->object;
247
248                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
249                 ib_dealloc_pd(pd);
250                 kfree(uobj);
251         }
252
253         return context->device->dealloc_ucontext(context);
254 }
255
256 static void ib_uverbs_release_file(struct kref *ref)
257 {
258         struct ib_uverbs_file *file =
259                 container_of(ref, struct ib_uverbs_file, ref);
260
261         module_put(file->device->ib_dev->owner);
262         kref_put(&file->device->ref, ib_uverbs_release_dev);
263
264         kfree(file);
265 }
266
267 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
268                                     size_t count, loff_t *pos)
269 {
270         struct ib_uverbs_event_file *file = filp->private_data;
271         struct ib_uverbs_event *event;
272         int eventsz;
273         int ret = 0;
274
275         spin_lock_irq(&file->lock);
276
277         while (list_empty(&file->event_list)) {
278                 spin_unlock_irq(&file->lock);
279
280                 if (filp->f_flags & O_NONBLOCK)
281                         return -EAGAIN;
282
283                 if (wait_event_interruptible(file->poll_wait,
284                                              !list_empty(&file->event_list)))
285                         return -ERESTARTSYS;
286
287                 spin_lock_irq(&file->lock);
288         }
289
290         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
291
292         if (file->is_async)
293                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
294         else
295                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
296
297         if (eventsz > count) {
298                 ret   = -EINVAL;
299                 event = NULL;
300         } else {
301                 list_del(file->event_list.next);
302                 if (event->counter) {
303                         ++(*event->counter);
304                         list_del(&event->obj_list);
305                 }
306         }
307
308         spin_unlock_irq(&file->lock);
309
310         if (event) {
311                 if (copy_to_user(buf, event, eventsz))
312                         ret = -EFAULT;
313                 else
314                         ret = eventsz;
315         }
316
317         kfree(event);
318
319         return ret;
320 }
321
322 static unsigned int ib_uverbs_event_poll(struct file *filp,
323                                          struct poll_table_struct *wait)
324 {
325         unsigned int pollflags = 0;
326         struct ib_uverbs_event_file *file = filp->private_data;
327
328         poll_wait(filp, &file->poll_wait, wait);
329
330         spin_lock_irq(&file->lock);
331         if (!list_empty(&file->event_list))
332                 pollflags = POLLIN | POLLRDNORM;
333         spin_unlock_irq(&file->lock);
334
335         return pollflags;
336 }
337
338 void ib_uverbs_release_event_file(struct kref *ref)
339 {
340         struct ib_uverbs_event_file *file =
341                 container_of(ref, struct ib_uverbs_event_file, ref);
342
343         kfree(file);
344 }
345
346 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
347 {
348         struct ib_uverbs_event_file *file = filp->private_data;
349
350         return fasync_helper(fd, filp, on, &file->async_queue);
351 }
352
353 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
354 {
355         struct ib_uverbs_event_file *file = filp->private_data;
356         struct ib_uverbs_event *entry, *tmp;
357
358         spin_lock_irq(&file->lock);
359         file->file = NULL;
360         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
361                 if (entry->counter)
362                         list_del(&entry->obj_list);
363                 kfree(entry);
364         }
365         spin_unlock_irq(&file->lock);
366
367         ib_uverbs_event_fasync(-1, filp, 0);
368
369         if (file->is_async) {
370                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
371                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
372         }
373         kref_put(&file->ref, ib_uverbs_release_event_file);
374
375         return 0;
376 }
377
378 static struct file_operations uverbs_event_fops = {
379         .owner   = THIS_MODULE,
380         .read    = ib_uverbs_event_read,
381         .poll    = ib_uverbs_event_poll,
382         .release = ib_uverbs_event_close,
383         .fasync  = ib_uverbs_event_fasync
384 };
385
386 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
387 {
388         struct ib_uverbs_event_file    *file = cq_context;
389         struct ib_ucq_object           *uobj;
390         struct ib_uverbs_event         *entry;
391         unsigned long                   flags;
392
393         if (!file)
394                 return;
395
396         spin_lock_irqsave(&file->lock, flags);
397         if (!file->file) {
398                 spin_unlock_irqrestore(&file->lock, flags);
399                 return;
400         }
401
402         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
403         if (!entry) {
404                 spin_unlock_irqrestore(&file->lock, flags);
405                 return;
406         }
407
408         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
409
410         entry->desc.comp.cq_handle = cq->uobject->user_handle;
411         entry->counter             = &uobj->comp_events_reported;
412
413         list_add_tail(&entry->list, &file->event_list);
414         list_add_tail(&entry->obj_list, &uobj->comp_list);
415         spin_unlock_irqrestore(&file->lock, flags);
416
417         wake_up_interruptible(&file->poll_wait);
418         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
419 }
420
421 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
422                                     __u64 element, __u64 event,
423                                     struct list_head *obj_list,
424                                     u32 *counter)
425 {
426         struct ib_uverbs_event *entry;
427         unsigned long flags;
428
429         spin_lock_irqsave(&file->async_file->lock, flags);
430         if (!file->async_file->file) {
431                 spin_unlock_irqrestore(&file->async_file->lock, flags);
432                 return;
433         }
434
435         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
436         if (!entry) {
437                 spin_unlock_irqrestore(&file->async_file->lock, flags);
438                 return;
439         }
440
441         entry->desc.async.element    = element;
442         entry->desc.async.event_type = event;
443         entry->counter               = counter;
444
445         list_add_tail(&entry->list, &file->async_file->event_list);
446         if (obj_list)
447                 list_add_tail(&entry->obj_list, obj_list);
448         spin_unlock_irqrestore(&file->async_file->lock, flags);
449
450         wake_up_interruptible(&file->async_file->poll_wait);
451         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
452 }
453
454 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
455 {
456         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
457                                                   struct ib_ucq_object, uobject);
458
459         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
460                                 event->event, &uobj->async_list,
461                                 &uobj->async_events_reported);
462 }
463
464 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
465 {
466         struct ib_uevent_object *uobj;
467
468         uobj = container_of(event->element.qp->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_srq_event_handler(struct ib_event *event, void *context_ptr)
477 {
478         struct ib_uevent_object *uobj;
479
480         uobj = container_of(event->element.srq->uobject,
481                             struct ib_uevent_object, uobject);
482
483         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
484                                 event->event, &uobj->event_list,
485                                 &uobj->events_reported);
486 }
487
488 void ib_uverbs_event_handler(struct ib_event_handler *handler,
489                              struct ib_event *event)
490 {
491         struct ib_uverbs_file *file =
492                 container_of(handler, struct ib_uverbs_file, event_handler);
493
494         ib_uverbs_async_handler(file, event->element.port_num, event->event,
495                                 NULL, NULL);
496 }
497
498 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
499                                         int is_async, int *fd)
500 {
501         struct ib_uverbs_event_file *ev_file;
502         struct file *filp;
503         int ret;
504
505         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
506         if (!ev_file)
507                 return ERR_PTR(-ENOMEM);
508
509         kref_init(&ev_file->ref);
510         spin_lock_init(&ev_file->lock);
511         INIT_LIST_HEAD(&ev_file->event_list);
512         init_waitqueue_head(&ev_file->poll_wait);
513         ev_file->uverbs_file = uverbs_file;
514         ev_file->async_queue = NULL;
515         ev_file->is_async    = is_async;
516
517         *fd = get_unused_fd();
518         if (*fd < 0) {
519                 ret = *fd;
520                 goto err;
521         }
522
523         filp = get_empty_filp();
524         if (!filp) {
525                 ret = -ENFILE;
526                 goto err_fd;
527         }
528
529         ev_file->file      = filp;
530
531         /*
532          * fops_get() can't fail here, because we're coming from a
533          * system call on a uverbs file, which will already have a
534          * module reference.
535          */
536         filp->f_op         = fops_get(&uverbs_event_fops);
537         filp->f_path.mnt           = mntget(uverbs_event_mnt);
538         filp->f_path.dentry        = dget(uverbs_event_mnt->mnt_root);
539         filp->f_mapping    = filp->f_path.dentry->d_inode->i_mapping;
540         filp->f_flags      = O_RDONLY;
541         filp->f_mode       = FMODE_READ;
542         filp->private_data = ev_file;
543
544         return filp;
545
546 err_fd:
547         put_unused_fd(*fd);
548
549 err:
550         kfree(ev_file);
551         return ERR_PTR(ret);
552 }
553
554 /*
555  * Look up a completion event file by FD.  If lookup is successful,
556  * takes a ref to the event file struct that it returns; if
557  * unsuccessful, returns NULL.
558  */
559 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
560 {
561         struct ib_uverbs_event_file *ev_file = NULL;
562         struct file *filp;
563
564         filp = fget(fd);
565         if (!filp)
566                 return NULL;
567
568         if (filp->f_op != &uverbs_event_fops)
569                 goto out;
570
571         ev_file = filp->private_data;
572         if (ev_file->is_async) {
573                 ev_file = NULL;
574                 goto out;
575         }
576
577         kref_get(&ev_file->ref);
578
579 out:
580         fput(filp);
581         return ev_file;
582 }
583
584 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
585                              size_t count, loff_t *pos)
586 {
587         struct ib_uverbs_file *file = filp->private_data;
588         struct ib_uverbs_cmd_hdr hdr;
589
590         if (count < sizeof hdr)
591                 return -EINVAL;
592
593         if (copy_from_user(&hdr, buf, sizeof hdr))
594                 return -EFAULT;
595
596         if (hdr.in_words * 4 != count)
597                 return -EINVAL;
598
599         if (hdr.command < 0                             ||
600             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
601             !uverbs_cmd_table[hdr.command]              ||
602             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
603                 return -EINVAL;
604
605         if (!file->ucontext &&
606             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
607                 return -EINVAL;
608
609         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
610                                              hdr.in_words * 4, hdr.out_words * 4);
611 }
612
613 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
614 {
615         struct ib_uverbs_file *file = filp->private_data;
616
617         if (!file->ucontext)
618                 return -ENODEV;
619         else
620                 return file->device->ib_dev->mmap(file->ucontext, vma);
621 }
622
623 static int ib_uverbs_open(struct inode *inode, struct file *filp)
624 {
625         struct ib_uverbs_device *dev;
626         struct ib_uverbs_file *file;
627         int ret;
628
629         spin_lock(&map_lock);
630         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
631         if (dev)
632                 kref_get(&dev->ref);
633         spin_unlock(&map_lock);
634
635         if (!dev)
636                 return -ENXIO;
637
638         if (!try_module_get(dev->ib_dev->owner)) {
639                 ret = -ENODEV;
640                 goto err;
641         }
642
643         file = kmalloc(sizeof *file, GFP_KERNEL);
644         if (!file) {
645                 ret = -ENOMEM;
646                 goto err_module;
647         }
648
649         file->device     = dev;
650         file->ucontext   = NULL;
651         file->async_file = NULL;
652         kref_init(&file->ref);
653         mutex_init(&file->mutex);
654
655         filp->private_data = file;
656
657         return 0;
658
659 err_module:
660         module_put(dev->ib_dev->owner);
661
662 err:
663         kref_put(&dev->ref, ib_uverbs_release_dev);
664
665         return ret;
666 }
667
668 static int ib_uverbs_close(struct inode *inode, struct file *filp)
669 {
670         struct ib_uverbs_file *file = filp->private_data;
671
672         ib_uverbs_cleanup_ucontext(file, file->ucontext);
673
674         if (file->async_file)
675                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
676
677         kref_put(&file->ref, ib_uverbs_release_file);
678
679         return 0;
680 }
681
682 static struct file_operations uverbs_fops = {
683         .owner   = THIS_MODULE,
684         .write   = ib_uverbs_write,
685         .open    = ib_uverbs_open,
686         .release = ib_uverbs_close
687 };
688
689 static struct file_operations uverbs_mmap_fops = {
690         .owner   = THIS_MODULE,
691         .write   = ib_uverbs_write,
692         .mmap    = ib_uverbs_mmap,
693         .open    = ib_uverbs_open,
694         .release = ib_uverbs_close
695 };
696
697 static struct ib_client uverbs_client = {
698         .name   = "uverbs",
699         .add    = ib_uverbs_add_one,
700         .remove = ib_uverbs_remove_one
701 };
702
703 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
704 {
705         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
706
707         if (!dev)
708                 return -ENODEV;
709
710         return sprintf(buf, "%s\n", dev->ib_dev->name);
711 }
712 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
713
714 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
715 {
716         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
717
718         if (!dev)
719                 return -ENODEV;
720
721         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
722 }
723 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
724
725 static ssize_t show_abi_version(struct class *class, char *buf)
726 {
727         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
728 }
729 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
730
731 static void ib_uverbs_add_one(struct ib_device *device)
732 {
733         struct ib_uverbs_device *uverbs_dev;
734
735         if (!device->alloc_ucontext)
736                 return;
737
738         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
739         if (!uverbs_dev)
740                 return;
741
742         kref_init(&uverbs_dev->ref);
743         init_completion(&uverbs_dev->comp);
744
745         spin_lock(&map_lock);
746         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
747         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
748                 spin_unlock(&map_lock);
749                 goto err;
750         }
751         set_bit(uverbs_dev->devnum, dev_map);
752         spin_unlock(&map_lock);
753
754         uverbs_dev->ib_dev           = device;
755         uverbs_dev->num_comp_vectors = 1;
756
757         uverbs_dev->dev = cdev_alloc();
758         if (!uverbs_dev->dev)
759                 goto err;
760         uverbs_dev->dev->owner = THIS_MODULE;
761         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
762         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
763         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
764                 goto err_cdev;
765
766         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
767                                                     uverbs_dev->dev->dev,
768                                                     device->dma_device,
769                                                     "uverbs%d", uverbs_dev->devnum);
770         if (IS_ERR(uverbs_dev->class_dev))
771                 goto err_cdev;
772
773         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
774
775         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
776                 goto err_class;
777         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
778                 goto err_class;
779
780         spin_lock(&map_lock);
781         dev_table[uverbs_dev->devnum] = uverbs_dev;
782         spin_unlock(&map_lock);
783
784         ib_set_client_data(device, &uverbs_client, uverbs_dev);
785
786         return;
787
788 err_class:
789         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
790
791 err_cdev:
792         cdev_del(uverbs_dev->dev);
793         clear_bit(uverbs_dev->devnum, dev_map);
794
795 err:
796         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
797         wait_for_completion(&uverbs_dev->comp);
798         kfree(uverbs_dev);
799         return;
800 }
801
802 static void ib_uverbs_remove_one(struct ib_device *device)
803 {
804         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
805
806         if (!uverbs_dev)
807                 return;
808
809         class_set_devdata(uverbs_dev->class_dev, NULL);
810         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
811         cdev_del(uverbs_dev->dev);
812
813         spin_lock(&map_lock);
814         dev_table[uverbs_dev->devnum] = NULL;
815         spin_unlock(&map_lock);
816
817         clear_bit(uverbs_dev->devnum, dev_map);
818
819         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
820         wait_for_completion(&uverbs_dev->comp);
821         kfree(uverbs_dev);
822 }
823
824 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
825                                const char *dev_name, void *data,
826                                struct vfsmount *mnt)
827 {
828         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
829                              INFINIBANDEVENTFS_MAGIC, mnt);
830 }
831
832 static struct file_system_type uverbs_event_fs = {
833         /* No owner field so module can be unloaded */
834         .name    = "infinibandeventfs",
835         .get_sb  = uverbs_event_get_sb,
836         .kill_sb = kill_litter_super
837 };
838
839 static int __init ib_uverbs_init(void)
840 {
841         int ret;
842
843         spin_lock_init(&map_lock);
844
845         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
846                                      "infiniband_verbs");
847         if (ret) {
848                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
849                 goto out;
850         }
851
852         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
853         if (IS_ERR(uverbs_class)) {
854                 ret = PTR_ERR(uverbs_class);
855                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
856                 goto out_chrdev;
857         }
858
859         ret = class_create_file(uverbs_class, &class_attr_abi_version);
860         if (ret) {
861                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
862                 goto out_class;
863         }
864
865         ret = register_filesystem(&uverbs_event_fs);
866         if (ret) {
867                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
868                 goto out_class;
869         }
870
871         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
872         if (IS_ERR(uverbs_event_mnt)) {
873                 ret = PTR_ERR(uverbs_event_mnt);
874                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
875                 goto out_fs;
876         }
877
878         ret = ib_register_client(&uverbs_client);
879         if (ret) {
880                 printk(KERN_ERR "user_verbs: couldn't register client\n");
881                 goto out_mnt;
882         }
883
884         return 0;
885
886 out_mnt:
887         mntput(uverbs_event_mnt);
888
889 out_fs:
890         unregister_filesystem(&uverbs_event_fs);
891
892 out_class:
893         class_destroy(uverbs_class);
894
895 out_chrdev:
896         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
897
898 out:
899         return ret;
900 }
901
902 static void __exit ib_uverbs_cleanup(void)
903 {
904         ib_unregister_client(&uverbs_client);
905         mntput(uverbs_event_mnt);
906         unregister_filesystem(&uverbs_event_fs);
907         class_destroy(uverbs_class);
908         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
909         flush_scheduled_work();
910         idr_destroy(&ib_uverbs_pd_idr);
911         idr_destroy(&ib_uverbs_mr_idr);
912         idr_destroy(&ib_uverbs_mw_idr);
913         idr_destroy(&ib_uverbs_ah_idr);
914         idr_destroy(&ib_uverbs_cq_idr);
915         idr_destroy(&ib_uverbs_qp_idr);
916         idr_destroy(&ib_uverbs_srq_idr);
917 }
918
919 module_init(ib_uverbs_init);
920 module_exit(ib_uverbs_cleanup);