Merge branch 'release' of git://lm-sensors.org/kernel/mhoffman/hwmon-2.6
[linux-2.6] / drivers / infiniband / core / uverbs_main.c
1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7  *
8  * This software is available to you under a choice of one of two
9  * licenses.  You may choose to be licensed under the terms of the GNU
10  * General Public License (GPL) Version 2, available from the file
11  * COPYING in the main directory of this source tree, or the
12  * OpenIB.org BSD license below:
13  *
14  *     Redistribution and use in source and binary forms, with or
15  *     without modification, are permitted provided that the following
16  *     conditions are met:
17  *
18  *      - Redistributions of source code must retain the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer.
21  *
22  *      - Redistributions in binary form must reproduce the above
23  *        copyright notice, this list of conditions and the following
24  *        disclaimer in the documentation and/or other materials
25  *        provided with the distribution.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34  * SOFTWARE.
35  */
36
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/file.h>
44 #include <linux/mount.h>
45 #include <linux/cdev.h>
46
47 #include <asm/uaccess.h>
48
49 #include "uverbs.h"
50
51 MODULE_AUTHOR("Roland Dreier");
52 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
56
57 enum {
58         IB_UVERBS_MAJOR       = 231,
59         IB_UVERBS_BASE_MINOR  = 192,
60         IB_UVERBS_MAX_DEVICES = 32
61 };
62
63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
64
65 static struct class *uverbs_class;
66
67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
68 DEFINE_IDR(ib_uverbs_pd_idr);
69 DEFINE_IDR(ib_uverbs_mr_idr);
70 DEFINE_IDR(ib_uverbs_mw_idr);
71 DEFINE_IDR(ib_uverbs_ah_idr);
72 DEFINE_IDR(ib_uverbs_cq_idr);
73 DEFINE_IDR(ib_uverbs_qp_idr);
74 DEFINE_IDR(ib_uverbs_srq_idr);
75
76 static spinlock_t map_lock;
77 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
78 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
79
80 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
81                                      const char __user *buf, int in_len,
82                                      int out_len) = {
83         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
84         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
85         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
86         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
87         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
88         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
89         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
90         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
91         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
92         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
93         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
94         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
95         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
96         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
97         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
98         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
99         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
100         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
101         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
102         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
103         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
104         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
105         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
106         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
107         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
108         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
109         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
110         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
111 };
112
113 static struct vfsmount *uverbs_event_mnt;
114
115 static void ib_uverbs_add_one(struct ib_device *device);
116 static void ib_uverbs_remove_one(struct ib_device *device);
117
118 static void ib_uverbs_release_dev(struct kref *ref)
119 {
120         struct ib_uverbs_device *dev =
121                 container_of(ref, struct ib_uverbs_device, ref);
122
123         complete(&dev->comp);
124 }
125
126 static void ib_uverbs_release_event_file(struct kref *ref)
127 {
128         struct ib_uverbs_event_file *file =
129                 container_of(ref, struct ib_uverbs_event_file, ref);
130
131         kfree(file);
132 }
133
134 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
135                           struct ib_uverbs_event_file *ev_file,
136                           struct ib_ucq_object *uobj)
137 {
138         struct ib_uverbs_event *evt, *tmp;
139
140         if (ev_file) {
141                 spin_lock_irq(&ev_file->lock);
142                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
143                         list_del(&evt->list);
144                         kfree(evt);
145                 }
146                 spin_unlock_irq(&ev_file->lock);
147
148                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
149         }
150
151         spin_lock_irq(&file->async_file->lock);
152         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
153                 list_del(&evt->list);
154                 kfree(evt);
155         }
156         spin_unlock_irq(&file->async_file->lock);
157 }
158
159 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
160                               struct ib_uevent_object *uobj)
161 {
162         struct ib_uverbs_event *evt, *tmp;
163
164         spin_lock_irq(&file->async_file->lock);
165         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
166                 list_del(&evt->list);
167                 kfree(evt);
168         }
169         spin_unlock_irq(&file->async_file->lock);
170 }
171
172 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
173                                     struct ib_uqp_object *uobj)
174 {
175         struct ib_uverbs_mcast_entry *mcast, *tmp;
176
177         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
178                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
179                 list_del(&mcast->list);
180                 kfree(mcast);
181         }
182 }
183
184 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
185                                       struct ib_ucontext *context)
186 {
187         struct ib_uobject *uobj, *tmp;
188
189         if (!context)
190                 return 0;
191
192         context->closing = 1;
193
194         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
195                 struct ib_ah *ah = uobj->object;
196
197                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
198                 ib_destroy_ah(ah);
199                 kfree(uobj);
200         }
201
202         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
203                 struct ib_qp *qp = uobj->object;
204                 struct ib_uqp_object *uqp =
205                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
206
207                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
208                 ib_uverbs_detach_umcast(qp, uqp);
209                 ib_destroy_qp(qp);
210                 ib_uverbs_release_uevent(file, &uqp->uevent);
211                 kfree(uqp);
212         }
213
214         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
215                 struct ib_cq *cq = uobj->object;
216                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
217                 struct ib_ucq_object *ucq =
218                         container_of(uobj, struct ib_ucq_object, uobject);
219
220                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
221                 ib_destroy_cq(cq);
222                 ib_uverbs_release_ucq(file, ev_file, ucq);
223                 kfree(ucq);
224         }
225
226         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
227                 struct ib_srq *srq = uobj->object;
228                 struct ib_uevent_object *uevent =
229                         container_of(uobj, struct ib_uevent_object, uobject);
230
231                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
232                 ib_destroy_srq(srq);
233                 ib_uverbs_release_uevent(file, uevent);
234                 kfree(uevent);
235         }
236
237         /* XXX Free MWs */
238
239         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
240                 struct ib_mr *mr = uobj->object;
241
242                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
243                 ib_dereg_mr(mr);
244                 kfree(uobj);
245         }
246
247         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
248                 struct ib_pd *pd = uobj->object;
249
250                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
251                 ib_dealloc_pd(pd);
252                 kfree(uobj);
253         }
254
255         return context->device->dealloc_ucontext(context);
256 }
257
258 static void ib_uverbs_release_file(struct kref *ref)
259 {
260         struct ib_uverbs_file *file =
261                 container_of(ref, struct ib_uverbs_file, ref);
262
263         module_put(file->device->ib_dev->owner);
264         kref_put(&file->device->ref, ib_uverbs_release_dev);
265
266         kfree(file);
267 }
268
269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
270                                     size_t count, loff_t *pos)
271 {
272         struct ib_uverbs_event_file *file = filp->private_data;
273         struct ib_uverbs_event *event;
274         int eventsz;
275         int ret = 0;
276
277         spin_lock_irq(&file->lock);
278
279         while (list_empty(&file->event_list)) {
280                 spin_unlock_irq(&file->lock);
281
282                 if (filp->f_flags & O_NONBLOCK)
283                         return -EAGAIN;
284
285                 if (wait_event_interruptible(file->poll_wait,
286                                              !list_empty(&file->event_list)))
287                         return -ERESTARTSYS;
288
289                 spin_lock_irq(&file->lock);
290         }
291
292         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
293
294         if (file->is_async)
295                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
296         else
297                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
298
299         if (eventsz > count) {
300                 ret   = -EINVAL;
301                 event = NULL;
302         } else {
303                 list_del(file->event_list.next);
304                 if (event->counter) {
305                         ++(*event->counter);
306                         list_del(&event->obj_list);
307                 }
308         }
309
310         spin_unlock_irq(&file->lock);
311
312         if (event) {
313                 if (copy_to_user(buf, event, eventsz))
314                         ret = -EFAULT;
315                 else
316                         ret = eventsz;
317         }
318
319         kfree(event);
320
321         return ret;
322 }
323
324 static unsigned int ib_uverbs_event_poll(struct file *filp,
325                                          struct poll_table_struct *wait)
326 {
327         unsigned int pollflags = 0;
328         struct ib_uverbs_event_file *file = filp->private_data;
329
330         poll_wait(filp, &file->poll_wait, wait);
331
332         spin_lock_irq(&file->lock);
333         if (!list_empty(&file->event_list))
334                 pollflags = POLLIN | POLLRDNORM;
335         spin_unlock_irq(&file->lock);
336
337         return pollflags;
338 }
339
340 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
341 {
342         struct ib_uverbs_event_file *file = filp->private_data;
343
344         return fasync_helper(fd, filp, on, &file->async_queue);
345 }
346
347 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
348 {
349         struct ib_uverbs_event_file *file = filp->private_data;
350         struct ib_uverbs_event *entry, *tmp;
351
352         spin_lock_irq(&file->lock);
353         file->is_closed = 1;
354         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
355                 if (entry->counter)
356                         list_del(&entry->obj_list);
357                 kfree(entry);
358         }
359         spin_unlock_irq(&file->lock);
360
361         ib_uverbs_event_fasync(-1, filp, 0);
362
363         if (file->is_async) {
364                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
365                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
366         }
367         kref_put(&file->ref, ib_uverbs_release_event_file);
368
369         return 0;
370 }
371
372 static const struct file_operations uverbs_event_fops = {
373         .owner   = THIS_MODULE,
374         .read    = ib_uverbs_event_read,
375         .poll    = ib_uverbs_event_poll,
376         .release = ib_uverbs_event_close,
377         .fasync  = ib_uverbs_event_fasync
378 };
379
380 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
381 {
382         struct ib_uverbs_event_file    *file = cq_context;
383         struct ib_ucq_object           *uobj;
384         struct ib_uverbs_event         *entry;
385         unsigned long                   flags;
386
387         if (!file)
388                 return;
389
390         spin_lock_irqsave(&file->lock, flags);
391         if (file->is_closed) {
392                 spin_unlock_irqrestore(&file->lock, flags);
393                 return;
394         }
395
396         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
397         if (!entry) {
398                 spin_unlock_irqrestore(&file->lock, flags);
399                 return;
400         }
401
402         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
403
404         entry->desc.comp.cq_handle = cq->uobject->user_handle;
405         entry->counter             = &uobj->comp_events_reported;
406
407         list_add_tail(&entry->list, &file->event_list);
408         list_add_tail(&entry->obj_list, &uobj->comp_list);
409         spin_unlock_irqrestore(&file->lock, flags);
410
411         wake_up_interruptible(&file->poll_wait);
412         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
413 }
414
415 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
416                                     __u64 element, __u64 event,
417                                     struct list_head *obj_list,
418                                     u32 *counter)
419 {
420         struct ib_uverbs_event *entry;
421         unsigned long flags;
422
423         spin_lock_irqsave(&file->async_file->lock, flags);
424         if (file->async_file->is_closed) {
425                 spin_unlock_irqrestore(&file->async_file->lock, flags);
426                 return;
427         }
428
429         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
430         if (!entry) {
431                 spin_unlock_irqrestore(&file->async_file->lock, flags);
432                 return;
433         }
434
435         entry->desc.async.element    = element;
436         entry->desc.async.event_type = event;
437         entry->counter               = counter;
438
439         list_add_tail(&entry->list, &file->async_file->event_list);
440         if (obj_list)
441                 list_add_tail(&entry->obj_list, obj_list);
442         spin_unlock_irqrestore(&file->async_file->lock, flags);
443
444         wake_up_interruptible(&file->async_file->poll_wait);
445         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
446 }
447
448 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
449 {
450         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
451                                                   struct ib_ucq_object, uobject);
452
453         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
454                                 event->event, &uobj->async_list,
455                                 &uobj->async_events_reported);
456 }
457
458 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
459 {
460         struct ib_uevent_object *uobj;
461
462         uobj = container_of(event->element.qp->uobject,
463                             struct ib_uevent_object, uobject);
464
465         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
466                                 event->event, &uobj->event_list,
467                                 &uobj->events_reported);
468 }
469
470 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
471 {
472         struct ib_uevent_object *uobj;
473
474         uobj = container_of(event->element.srq->uobject,
475                             struct ib_uevent_object, uobject);
476
477         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
478                                 event->event, &uobj->event_list,
479                                 &uobj->events_reported);
480 }
481
482 void ib_uverbs_event_handler(struct ib_event_handler *handler,
483                              struct ib_event *event)
484 {
485         struct ib_uverbs_file *file =
486                 container_of(handler, struct ib_uverbs_file, event_handler);
487
488         ib_uverbs_async_handler(file, event->element.port_num, event->event,
489                                 NULL, NULL);
490 }
491
492 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
493                                         int is_async, int *fd)
494 {
495         struct ib_uverbs_event_file *ev_file;
496         struct file *filp;
497         int ret;
498
499         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
500         if (!ev_file)
501                 return ERR_PTR(-ENOMEM);
502
503         kref_init(&ev_file->ref);
504         spin_lock_init(&ev_file->lock);
505         INIT_LIST_HEAD(&ev_file->event_list);
506         init_waitqueue_head(&ev_file->poll_wait);
507         ev_file->uverbs_file = uverbs_file;
508         ev_file->async_queue = NULL;
509         ev_file->is_async    = is_async;
510         ev_file->is_closed   = 0;
511
512         *fd = get_unused_fd();
513         if (*fd < 0) {
514                 ret = *fd;
515                 goto err;
516         }
517
518         /*
519          * fops_get() can't fail here, because we're coming from a
520          * system call on a uverbs file, which will already have a
521          * module reference.
522          */
523         filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root),
524                           FMODE_READ, fops_get(&uverbs_event_fops));
525         if (!filp) {
526                 ret = -ENFILE;
527                 goto err_fd;
528         }
529
530         filp->private_data = ev_file;
531
532         return filp;
533
534 err_fd:
535         put_unused_fd(*fd);
536
537 err:
538         kfree(ev_file);
539         return ERR_PTR(ret);
540 }
541
542 /*
543  * Look up a completion event file by FD.  If lookup is successful,
544  * takes a ref to the event file struct that it returns; if
545  * unsuccessful, returns NULL.
546  */
547 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
548 {
549         struct ib_uverbs_event_file *ev_file = NULL;
550         struct file *filp;
551
552         filp = fget(fd);
553         if (!filp)
554                 return NULL;
555
556         if (filp->f_op != &uverbs_event_fops)
557                 goto out;
558
559         ev_file = filp->private_data;
560         if (ev_file->is_async) {
561                 ev_file = NULL;
562                 goto out;
563         }
564
565         kref_get(&ev_file->ref);
566
567 out:
568         fput(filp);
569         return ev_file;
570 }
571
572 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
573                              size_t count, loff_t *pos)
574 {
575         struct ib_uverbs_file *file = filp->private_data;
576         struct ib_uverbs_cmd_hdr hdr;
577
578         if (count < sizeof hdr)
579                 return -EINVAL;
580
581         if (copy_from_user(&hdr, buf, sizeof hdr))
582                 return -EFAULT;
583
584         if (hdr.in_words * 4 != count)
585                 return -EINVAL;
586
587         if (hdr.command < 0                             ||
588             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
589             !uverbs_cmd_table[hdr.command]              ||
590             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
591                 return -EINVAL;
592
593         if (!file->ucontext &&
594             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
595                 return -EINVAL;
596
597         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
598                                              hdr.in_words * 4, hdr.out_words * 4);
599 }
600
601 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
602 {
603         struct ib_uverbs_file *file = filp->private_data;
604
605         if (!file->ucontext)
606                 return -ENODEV;
607         else
608                 return file->device->ib_dev->mmap(file->ucontext, vma);
609 }
610
611 /*
612  * ib_uverbs_open() does not need the BKL:
613  *
614  *  - dev_table[] accesses are protected by map_lock, the
615  *    ib_uverbs_device structures are properly reference counted, and
616  *    everything else is purely local to the file being created, so
617  *    races against other open calls are not a problem;
618  *  - there is no ioctl method to race against;
619  *  - the device is added to dev_table[] as the last part of module
620  *    initialization, the open method will either immediately run
621  *    -ENXIO, or all required initialization will be done.
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         return ret;
665 }
666
667 static int ib_uverbs_close(struct inode *inode, struct file *filp)
668 {
669         struct ib_uverbs_file *file = filp->private_data;
670
671         ib_uverbs_cleanup_ucontext(file, file->ucontext);
672
673         if (file->async_file)
674                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
675
676         kref_put(&file->ref, ib_uverbs_release_file);
677
678         return 0;
679 }
680
681 static const struct file_operations uverbs_fops = {
682         .owner   = THIS_MODULE,
683         .write   = ib_uverbs_write,
684         .open    = ib_uverbs_open,
685         .release = ib_uverbs_close
686 };
687
688 static const struct file_operations uverbs_mmap_fops = {
689         .owner   = THIS_MODULE,
690         .write   = ib_uverbs_write,
691         .mmap    = ib_uverbs_mmap,
692         .open    = ib_uverbs_open,
693         .release = ib_uverbs_close
694 };
695
696 static struct ib_client uverbs_client = {
697         .name   = "uverbs",
698         .add    = ib_uverbs_add_one,
699         .remove = ib_uverbs_remove_one
700 };
701
702 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
703                           char *buf)
704 {
705         struct ib_uverbs_device *dev = dev_get_drvdata(device);
706
707         if (!dev)
708                 return -ENODEV;
709
710         return sprintf(buf, "%s\n", dev->ib_dev->name);
711 }
712 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
713
714 static ssize_t show_dev_abi_version(struct device *device,
715                                     struct device_attribute *attr, char *buf)
716 {
717         struct ib_uverbs_device *dev = dev_get_drvdata(device);
718
719         if (!dev)
720                 return -ENODEV;
721
722         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
723 }
724 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
725
726 static ssize_t show_abi_version(struct class *class, char *buf)
727 {
728         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
729 }
730 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
731
732 static void ib_uverbs_add_one(struct ib_device *device)
733 {
734         struct ib_uverbs_device *uverbs_dev;
735
736         if (!device->alloc_ucontext)
737                 return;
738
739         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
740         if (!uverbs_dev)
741                 return;
742
743         kref_init(&uverbs_dev->ref);
744         init_completion(&uverbs_dev->comp);
745
746         spin_lock(&map_lock);
747         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
748         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
749                 spin_unlock(&map_lock);
750                 goto err;
751         }
752         set_bit(uverbs_dev->devnum, dev_map);
753         spin_unlock(&map_lock);
754
755         uverbs_dev->ib_dev           = device;
756         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
757
758         uverbs_dev->cdev = cdev_alloc();
759         if (!uverbs_dev->cdev)
760                 goto err;
761         uverbs_dev->cdev->owner = THIS_MODULE;
762         uverbs_dev->cdev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
763         kobject_set_name(&uverbs_dev->cdev->kobj, "uverbs%d", uverbs_dev->devnum);
764         if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
765                 goto err_cdev;
766
767         uverbs_dev->dev = device_create_drvdata(uverbs_class,
768                                                 device->dma_device,
769                                                 uverbs_dev->cdev->dev,
770                                                 uverbs_dev,
771                                                 "uverbs%d",
772                                                 uverbs_dev->devnum);
773         if (IS_ERR(uverbs_dev->dev))
774                 goto err_cdev;
775
776         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
777                 goto err_class;
778         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
779                 goto err_class;
780
781         spin_lock(&map_lock);
782         dev_table[uverbs_dev->devnum] = uverbs_dev;
783         spin_unlock(&map_lock);
784
785         ib_set_client_data(device, &uverbs_client, uverbs_dev);
786
787         return;
788
789 err_class:
790         device_destroy(uverbs_class, uverbs_dev->cdev->dev);
791
792 err_cdev:
793         cdev_del(uverbs_dev->cdev);
794         clear_bit(uverbs_dev->devnum, dev_map);
795
796 err:
797         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
798         wait_for_completion(&uverbs_dev->comp);
799         kfree(uverbs_dev);
800         return;
801 }
802
803 static void ib_uverbs_remove_one(struct ib_device *device)
804 {
805         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
806
807         if (!uverbs_dev)
808                 return;
809
810         dev_set_drvdata(uverbs_dev->dev, NULL);
811         device_destroy(uverbs_class, uverbs_dev->cdev->dev);
812         cdev_del(uverbs_dev->cdev);
813
814         spin_lock(&map_lock);
815         dev_table[uverbs_dev->devnum] = NULL;
816         spin_unlock(&map_lock);
817
818         clear_bit(uverbs_dev->devnum, dev_map);
819
820         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
821         wait_for_completion(&uverbs_dev->comp);
822         kfree(uverbs_dev);
823 }
824
825 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
826                                const char *dev_name, void *data,
827                                struct vfsmount *mnt)
828 {
829         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
830                              INFINIBANDEVENTFS_MAGIC, mnt);
831 }
832
833 static struct file_system_type uverbs_event_fs = {
834         /* No owner field so module can be unloaded */
835         .name    = "infinibandeventfs",
836         .get_sb  = uverbs_event_get_sb,
837         .kill_sb = kill_litter_super
838 };
839
840 static int __init ib_uverbs_init(void)
841 {
842         int ret;
843
844         spin_lock_init(&map_lock);
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 = register_filesystem(&uverbs_event_fs);
867         if (ret) {
868                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
869                 goto out_class;
870         }
871
872         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
873         if (IS_ERR(uverbs_event_mnt)) {
874                 ret = PTR_ERR(uverbs_event_mnt);
875                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
876                 goto out_fs;
877         }
878
879         ret = ib_register_client(&uverbs_client);
880         if (ret) {
881                 printk(KERN_ERR "user_verbs: couldn't register client\n");
882                 goto out_mnt;
883         }
884
885         return 0;
886
887 out_mnt:
888         mntput(uverbs_event_mnt);
889
890 out_fs:
891         unregister_filesystem(&uverbs_event_fs);
892
893 out_class:
894         class_destroy(uverbs_class);
895
896 out_chrdev:
897         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
898
899 out:
900         return ret;
901 }
902
903 static void __exit ib_uverbs_cleanup(void)
904 {
905         ib_unregister_client(&uverbs_client);
906         mntput(uverbs_event_mnt);
907         unregister_filesystem(&uverbs_event_fs);
908         class_destroy(uverbs_class);
909         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
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);