Merge tag 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma
[muen/linux.git] / drivers / infiniband / core / uverbs_main.c
1 /*
2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
7  *
8  * This software is available to you under a choice of one of two
9  * licenses.  You may choose to be licensed under the terms of the GNU
10  * General Public License (GPL) Version 2, available from the file
11  * COPYING in the main directory of this source tree, or the
12  * OpenIB.org BSD license below:
13  *
14  *     Redistribution and use in source and binary forms, with or
15  *     without modification, are permitted provided that the following
16  *     conditions are met:
17  *
18  *      - Redistributions of source code must retain the above
19  *        copyright notice, this list of conditions and the following
20  *        disclaimer.
21  *
22  *      - Redistributions in binary form must reproduce the above
23  *        copyright notice, this list of conditions and the following
24  *        disclaimer in the documentation and/or other materials
25  *        provided with the distribution.
26  *
27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
34  * SOFTWARE.
35  */
36
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/device.h>
40 #include <linux/err.h>
41 #include <linux/fs.h>
42 #include <linux/poll.h>
43 #include <linux/sched.h>
44 #include <linux/sched/mm.h>
45 #include <linux/sched/task.h>
46 #include <linux/file.h>
47 #include <linux/cdev.h>
48 #include <linux/anon_inodes.h>
49 #include <linux/slab.h>
50
51 #include <linux/uaccess.h>
52
53 #include <rdma/ib.h>
54 #include <rdma/uverbs_std_types.h>
55
56 #include "uverbs.h"
57 #include "core_priv.h"
58 #include "rdma_core.h"
59
60 MODULE_AUTHOR("Roland Dreier");
61 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
62 MODULE_LICENSE("Dual BSD/GPL");
63
64 enum {
65         IB_UVERBS_MAJOR       = 231,
66         IB_UVERBS_BASE_MINOR  = 192,
67         IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
68         IB_UVERBS_NUM_FIXED_MINOR = 32,
69         IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
70 };
71
72 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
73
74 static dev_t dynamic_uverbs_dev;
75 static struct class *uverbs_class;
76
77 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
78
79 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
80                                      struct ib_device *ib_dev,
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_REREG_MR]            = ib_uverbs_rereg_mr,
90         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
91         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
92         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
93         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
94         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
95         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
96         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
97         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
98         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
99         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
100         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
101         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
102         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
103         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
104         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
105         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
106         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
107         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
108         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
109         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
110         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
111         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
112         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
113         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
114         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
115         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
116         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
117         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
118 };
119
120 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
121                                     struct ib_device *ib_dev,
122                                     struct ib_udata *ucore,
123                                     struct ib_udata *uhw) = {
124         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
125         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
126         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
127         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
128         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
129         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
130         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
131         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
132         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
133         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
134         [IB_USER_VERBS_EX_CMD_MODIFY_QP]        = ib_uverbs_ex_modify_qp,
135         [IB_USER_VERBS_EX_CMD_MODIFY_CQ]        = ib_uverbs_ex_modify_cq,
136 };
137
138 static void ib_uverbs_add_one(struct ib_device *device);
139 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
140
141 int uverbs_dealloc_mw(struct ib_mw *mw)
142 {
143         struct ib_pd *pd = mw->pd;
144         int ret;
145
146         ret = mw->device->dealloc_mw(mw);
147         if (!ret)
148                 atomic_dec(&pd->usecnt);
149         return ret;
150 }
151
152 static void ib_uverbs_release_dev(struct kobject *kobj)
153 {
154         struct ib_uverbs_device *dev =
155                 container_of(kobj, struct ib_uverbs_device, kobj);
156
157         cleanup_srcu_struct(&dev->disassociate_srcu);
158         kfree(dev);
159 }
160
161 static struct kobj_type ib_uverbs_dev_ktype = {
162         .release = ib_uverbs_release_dev,
163 };
164
165 static void ib_uverbs_release_async_event_file(struct kref *ref)
166 {
167         struct ib_uverbs_async_event_file *file =
168                 container_of(ref, struct ib_uverbs_async_event_file, ref);
169
170         kfree(file);
171 }
172
173 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
174                           struct ib_uverbs_completion_event_file *ev_file,
175                           struct ib_ucq_object *uobj)
176 {
177         struct ib_uverbs_event *evt, *tmp;
178
179         if (ev_file) {
180                 spin_lock_irq(&ev_file->ev_queue.lock);
181                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
182                         list_del(&evt->list);
183                         kfree(evt);
184                 }
185                 spin_unlock_irq(&ev_file->ev_queue.lock);
186
187                 uverbs_uobject_put(&ev_file->uobj_file.uobj);
188         }
189
190         spin_lock_irq(&file->async_file->ev_queue.lock);
191         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
192                 list_del(&evt->list);
193                 kfree(evt);
194         }
195         spin_unlock_irq(&file->async_file->ev_queue.lock);
196 }
197
198 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
199                               struct ib_uevent_object *uobj)
200 {
201         struct ib_uverbs_event *evt, *tmp;
202
203         spin_lock_irq(&file->async_file->ev_queue.lock);
204         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
205                 list_del(&evt->list);
206                 kfree(evt);
207         }
208         spin_unlock_irq(&file->async_file->ev_queue.lock);
209 }
210
211 void ib_uverbs_detach_umcast(struct ib_qp *qp,
212                              struct ib_uqp_object *uobj)
213 {
214         struct ib_uverbs_mcast_entry *mcast, *tmp;
215
216         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
217                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
218                 list_del(&mcast->list);
219                 kfree(mcast);
220         }
221 }
222
223 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
224                                       struct ib_ucontext *context,
225                                       bool device_removed)
226 {
227         context->closing = 1;
228         uverbs_cleanup_ucontext(context, device_removed);
229         put_pid(context->tgid);
230
231         ib_rdmacg_uncharge(&context->cg_obj, context->device,
232                            RDMACG_RESOURCE_HCA_HANDLE);
233
234         return context->device->dealloc_ucontext(context);
235 }
236
237 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
238 {
239         complete(&dev->comp);
240 }
241
242 void ib_uverbs_release_file(struct kref *ref)
243 {
244         struct ib_uverbs_file *file =
245                 container_of(ref, struct ib_uverbs_file, ref);
246         struct ib_device *ib_dev;
247         int srcu_key;
248
249         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
250         ib_dev = srcu_dereference(file->device->ib_dev,
251                                   &file->device->disassociate_srcu);
252         if (ib_dev && !ib_dev->disassociate_ucontext)
253                 module_put(ib_dev->owner);
254         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
255
256         if (atomic_dec_and_test(&file->device->refcount))
257                 ib_uverbs_comp_dev(file->device);
258
259         kobject_put(&file->device->kobj);
260         kfree(file);
261 }
262
263 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
264                                     struct ib_uverbs_file *uverbs_file,
265                                     struct file *filp, char __user *buf,
266                                     size_t count, loff_t *pos,
267                                     size_t eventsz)
268 {
269         struct ib_uverbs_event *event;
270         int ret = 0;
271
272         spin_lock_irq(&ev_queue->lock);
273
274         while (list_empty(&ev_queue->event_list)) {
275                 spin_unlock_irq(&ev_queue->lock);
276
277                 if (filp->f_flags & O_NONBLOCK)
278                         return -EAGAIN;
279
280                 if (wait_event_interruptible(ev_queue->poll_wait,
281                                              (!list_empty(&ev_queue->event_list) ||
282                         /* The barriers built into wait_event_interruptible()
283                          * and wake_up() guarentee this will see the null set
284                          * without using RCU
285                          */
286                                              !uverbs_file->device->ib_dev)))
287                         return -ERESTARTSYS;
288
289                 /* If device was disassociated and no event exists set an error */
290                 if (list_empty(&ev_queue->event_list) &&
291                     !uverbs_file->device->ib_dev)
292                         return -EIO;
293
294                 spin_lock_irq(&ev_queue->lock);
295         }
296
297         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
298
299         if (eventsz > count) {
300                 ret   = -EINVAL;
301                 event = NULL;
302         } else {
303                 list_del(ev_queue->event_list.next);
304                 if (event->counter) {
305                         ++(*event->counter);
306                         list_del(&event->obj_list);
307                 }
308         }
309
310         spin_unlock_irq(&ev_queue->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 ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
325                                           size_t count, loff_t *pos)
326 {
327         struct ib_uverbs_async_event_file *file = filp->private_data;
328
329         return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
330                                     buf, count, pos,
331                                     sizeof(struct ib_uverbs_async_event_desc));
332 }
333
334 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
335                                          size_t count, loff_t *pos)
336 {
337         struct ib_uverbs_completion_event_file *comp_ev_file =
338                 filp->private_data;
339
340         return ib_uverbs_event_read(&comp_ev_file->ev_queue,
341                                     comp_ev_file->uobj_file.ufile, filp,
342                                     buf, count, pos,
343                                     sizeof(struct ib_uverbs_comp_event_desc));
344 }
345
346 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
347                                          struct file *filp,
348                                          struct poll_table_struct *wait)
349 {
350         __poll_t pollflags = 0;
351
352         poll_wait(filp, &ev_queue->poll_wait, wait);
353
354         spin_lock_irq(&ev_queue->lock);
355         if (!list_empty(&ev_queue->event_list))
356                 pollflags = EPOLLIN | EPOLLRDNORM;
357         spin_unlock_irq(&ev_queue->lock);
358
359         return pollflags;
360 }
361
362 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
363                                                struct poll_table_struct *wait)
364 {
365         return ib_uverbs_event_poll(filp->private_data, filp, wait);
366 }
367
368 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
369                                               struct poll_table_struct *wait)
370 {
371         struct ib_uverbs_completion_event_file *comp_ev_file =
372                 filp->private_data;
373
374         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
375 }
376
377 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
378 {
379         struct ib_uverbs_event_queue *ev_queue = filp->private_data;
380
381         return fasync_helper(fd, filp, on, &ev_queue->async_queue);
382 }
383
384 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
385 {
386         struct ib_uverbs_completion_event_file *comp_ev_file =
387                 filp->private_data;
388
389         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
390 }
391
392 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
393 {
394         struct ib_uverbs_async_event_file *file = filp->private_data;
395         struct ib_uverbs_file *uverbs_file = file->uverbs_file;
396         struct ib_uverbs_event *entry, *tmp;
397         int closed_already = 0;
398
399         mutex_lock(&uverbs_file->device->lists_mutex);
400         spin_lock_irq(&file->ev_queue.lock);
401         closed_already = file->ev_queue.is_closed;
402         file->ev_queue.is_closed = 1;
403         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
404                 if (entry->counter)
405                         list_del(&entry->obj_list);
406                 kfree(entry);
407         }
408         spin_unlock_irq(&file->ev_queue.lock);
409         if (!closed_already) {
410                 list_del(&file->list);
411                 ib_unregister_event_handler(&uverbs_file->event_handler);
412         }
413         mutex_unlock(&uverbs_file->device->lists_mutex);
414
415         kref_put(&uverbs_file->ref, ib_uverbs_release_file);
416         kref_put(&file->ref, ib_uverbs_release_async_event_file);
417
418         return 0;
419 }
420
421 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
422 {
423         struct ib_uverbs_completion_event_file *file = filp->private_data;
424         struct ib_uverbs_event *entry, *tmp;
425
426         spin_lock_irq(&file->ev_queue.lock);
427         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
428                 if (entry->counter)
429                         list_del(&entry->obj_list);
430                 kfree(entry);
431         }
432         spin_unlock_irq(&file->ev_queue.lock);
433
434         uverbs_close_fd(filp);
435
436         return 0;
437 }
438
439 const struct file_operations uverbs_event_fops = {
440         .owner   = THIS_MODULE,
441         .read    = ib_uverbs_comp_event_read,
442         .poll    = ib_uverbs_comp_event_poll,
443         .release = ib_uverbs_comp_event_close,
444         .fasync  = ib_uverbs_comp_event_fasync,
445         .llseek  = no_llseek,
446 };
447
448 static const struct file_operations uverbs_async_event_fops = {
449         .owner   = THIS_MODULE,
450         .read    = ib_uverbs_async_event_read,
451         .poll    = ib_uverbs_async_event_poll,
452         .release = ib_uverbs_async_event_close,
453         .fasync  = ib_uverbs_async_event_fasync,
454         .llseek  = no_llseek,
455 };
456
457 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
458 {
459         struct ib_uverbs_event_queue   *ev_queue = cq_context;
460         struct ib_ucq_object           *uobj;
461         struct ib_uverbs_event         *entry;
462         unsigned long                   flags;
463
464         if (!ev_queue)
465                 return;
466
467         spin_lock_irqsave(&ev_queue->lock, flags);
468         if (ev_queue->is_closed) {
469                 spin_unlock_irqrestore(&ev_queue->lock, flags);
470                 return;
471         }
472
473         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
474         if (!entry) {
475                 spin_unlock_irqrestore(&ev_queue->lock, flags);
476                 return;
477         }
478
479         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
480
481         entry->desc.comp.cq_handle = cq->uobject->user_handle;
482         entry->counter             = &uobj->comp_events_reported;
483
484         list_add_tail(&entry->list, &ev_queue->event_list);
485         list_add_tail(&entry->obj_list, &uobj->comp_list);
486         spin_unlock_irqrestore(&ev_queue->lock, flags);
487
488         wake_up_interruptible(&ev_queue->poll_wait);
489         kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
490 }
491
492 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
493                                     __u64 element, __u64 event,
494                                     struct list_head *obj_list,
495                                     u32 *counter)
496 {
497         struct ib_uverbs_event *entry;
498         unsigned long flags;
499
500         spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
501         if (file->async_file->ev_queue.is_closed) {
502                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
503                 return;
504         }
505
506         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
507         if (!entry) {
508                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
509                 return;
510         }
511
512         entry->desc.async.element    = element;
513         entry->desc.async.event_type = event;
514         entry->desc.async.reserved   = 0;
515         entry->counter               = counter;
516
517         list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
518         if (obj_list)
519                 list_add_tail(&entry->obj_list, obj_list);
520         spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
521
522         wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
523         kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
524 }
525
526 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
527 {
528         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
529                                                   struct ib_ucq_object, uobject);
530
531         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
532                                 event->event, &uobj->async_list,
533                                 &uobj->async_events_reported);
534 }
535
536 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
537 {
538         struct ib_uevent_object *uobj;
539
540         /* for XRC target qp's, check that qp is live */
541         if (!event->element.qp->uobject)
542                 return;
543
544         uobj = container_of(event->element.qp->uobject,
545                             struct ib_uevent_object, uobject);
546
547         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
548                                 event->event, &uobj->event_list,
549                                 &uobj->events_reported);
550 }
551
552 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
553 {
554         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
555                                                   struct ib_uevent_object, uobject);
556
557         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
558                                 event->event, &uobj->event_list,
559                                 &uobj->events_reported);
560 }
561
562 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
563 {
564         struct ib_uevent_object *uobj;
565
566         uobj = container_of(event->element.srq->uobject,
567                             struct ib_uevent_object, uobject);
568
569         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
570                                 event->event, &uobj->event_list,
571                                 &uobj->events_reported);
572 }
573
574 void ib_uverbs_event_handler(struct ib_event_handler *handler,
575                              struct ib_event *event)
576 {
577         struct ib_uverbs_file *file =
578                 container_of(handler, struct ib_uverbs_file, event_handler);
579
580         ib_uverbs_async_handler(file, event->element.port_num, event->event,
581                                 NULL, NULL);
582 }
583
584 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
585 {
586         kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
587         file->async_file = NULL;
588 }
589
590 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
591 {
592         spin_lock_init(&ev_queue->lock);
593         INIT_LIST_HEAD(&ev_queue->event_list);
594         init_waitqueue_head(&ev_queue->poll_wait);
595         ev_queue->is_closed   = 0;
596         ev_queue->async_queue = NULL;
597 }
598
599 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
600                                               struct ib_device  *ib_dev)
601 {
602         struct ib_uverbs_async_event_file *ev_file;
603         struct file *filp;
604
605         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
606         if (!ev_file)
607                 return ERR_PTR(-ENOMEM);
608
609         ib_uverbs_init_event_queue(&ev_file->ev_queue);
610         ev_file->uverbs_file = uverbs_file;
611         kref_get(&ev_file->uverbs_file->ref);
612         kref_init(&ev_file->ref);
613         filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
614                                   ev_file, O_RDONLY);
615         if (IS_ERR(filp))
616                 goto err_put_refs;
617
618         mutex_lock(&uverbs_file->device->lists_mutex);
619         list_add_tail(&ev_file->list,
620                       &uverbs_file->device->uverbs_events_file_list);
621         mutex_unlock(&uverbs_file->device->lists_mutex);
622
623         WARN_ON(uverbs_file->async_file);
624         uverbs_file->async_file = ev_file;
625         kref_get(&uverbs_file->async_file->ref);
626         INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
627                               ib_dev,
628                               ib_uverbs_event_handler);
629         ib_register_event_handler(&uverbs_file->event_handler);
630         /* At that point async file stuff was fully set */
631
632         return filp;
633
634 err_put_refs:
635         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
636         kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
637         return filp;
638 }
639
640 static bool verify_command_mask(struct ib_device *ib_dev,
641                                 u32 command, bool extended)
642 {
643         if (!extended)
644                 return ib_dev->uverbs_cmd_mask & BIT_ULL(command);
645
646         return ib_dev->uverbs_ex_cmd_mask & BIT_ULL(command);
647 }
648
649 static bool verify_command_idx(u32 command, bool extended)
650 {
651         if (extended)
652                 return command < ARRAY_SIZE(uverbs_ex_cmd_table) &&
653                        uverbs_ex_cmd_table[command];
654
655         return command < ARRAY_SIZE(uverbs_cmd_table) &&
656                uverbs_cmd_table[command];
657 }
658
659 static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr,
660                            u32 *command, bool *extended)
661 {
662         if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
663                                    IB_USER_VERBS_CMD_COMMAND_MASK))
664                 return -EINVAL;
665
666         *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK;
667         *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED;
668
669         if (!verify_command_idx(*command, *extended))
670                 return -EOPNOTSUPP;
671
672         return 0;
673 }
674
675 static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
676                           struct ib_uverbs_ex_cmd_hdr *ex_hdr,
677                           size_t count, bool extended)
678 {
679         if (extended) {
680                 count -= sizeof(*hdr) + sizeof(*ex_hdr);
681
682                 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
683                         return -EINVAL;
684
685                 if (ex_hdr->cmd_hdr_reserved)
686                         return -EINVAL;
687
688                 if (ex_hdr->response) {
689                         if (!hdr->out_words && !ex_hdr->provider_out_words)
690                                 return -EINVAL;
691
692                         if (!access_ok(VERIFY_WRITE,
693                                        u64_to_user_ptr(ex_hdr->response),
694                                        (hdr->out_words + ex_hdr->provider_out_words) * 8))
695                                 return -EFAULT;
696                 } else {
697                         if (hdr->out_words || ex_hdr->provider_out_words)
698                                 return -EINVAL;
699                 }
700
701                 return 0;
702         }
703
704         /* not extended command */
705         if (hdr->in_words * 4 != count)
706                 return -EINVAL;
707
708         return 0;
709 }
710
711 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
712                              size_t count, loff_t *pos)
713 {
714         struct ib_uverbs_file *file = filp->private_data;
715         struct ib_uverbs_ex_cmd_hdr ex_hdr;
716         struct ib_device *ib_dev;
717         struct ib_uverbs_cmd_hdr hdr;
718         bool extended;
719         int srcu_key;
720         u32 command;
721         ssize_t ret;
722
723         if (!ib_safe_file_access(filp)) {
724                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
725                             task_tgid_vnr(current), current->comm);
726                 return -EACCES;
727         }
728
729         if (count < sizeof(hdr))
730                 return -EINVAL;
731
732         if (copy_from_user(&hdr, buf, sizeof(hdr)))
733                 return -EFAULT;
734
735         ret = process_hdr(&hdr, &command, &extended);
736         if (ret)
737                 return ret;
738
739         if (extended) {
740                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
741                         return -EINVAL;
742                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
743                         return -EFAULT;
744         }
745
746         ret = verify_hdr(&hdr, &ex_hdr, count, extended);
747         if (ret)
748                 return ret;
749
750         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
751         ib_dev = srcu_dereference(file->device->ib_dev,
752                                   &file->device->disassociate_srcu);
753         if (!ib_dev) {
754                 ret = -EIO;
755                 goto out;
756         }
757
758         /*
759          * Must be after the ib_dev check, as once the RCU clears ib_dev ==
760          * NULL means ucontext == NULL
761          */
762         if (!file->ucontext &&
763             (command != IB_USER_VERBS_CMD_GET_CONTEXT || extended)) {
764                 ret = -EINVAL;
765                 goto out;
766         }
767
768         if (!verify_command_mask(ib_dev, command, extended)) {
769                 ret = -EOPNOTSUPP;
770                 goto out;
771         }
772
773         buf += sizeof(hdr);
774
775         if (!extended) {
776                 ret = uverbs_cmd_table[command](file, ib_dev, buf,
777                                                 hdr.in_words * 4,
778                                                 hdr.out_words * 4);
779         } else {
780                 struct ib_udata ucore;
781                 struct ib_udata uhw;
782
783                 buf += sizeof(ex_hdr);
784
785                 ib_uverbs_init_udata_buf_or_null(&ucore, buf,
786                                         u64_to_user_ptr(ex_hdr.response),
787                                         hdr.in_words * 8, hdr.out_words * 8);
788
789                 ib_uverbs_init_udata_buf_or_null(&uhw,
790                                         buf + ucore.inlen,
791                                         u64_to_user_ptr(ex_hdr.response) + ucore.outlen,
792                                         ex_hdr.provider_in_words * 8,
793                                         ex_hdr.provider_out_words * 8);
794
795                 ret = uverbs_ex_cmd_table[command](file, ib_dev, &ucore, &uhw);
796                 ret = (ret) ? : count;
797         }
798
799 out:
800         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
801         return ret;
802 }
803
804 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
805 {
806         struct ib_uverbs_file *file = filp->private_data;
807         struct ib_device *ib_dev;
808         int ret = 0;
809         int srcu_key;
810
811         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
812         ib_dev = srcu_dereference(file->device->ib_dev,
813                                   &file->device->disassociate_srcu);
814         if (!ib_dev) {
815                 ret = -EIO;
816                 goto out;
817         }
818
819         if (!file->ucontext)
820                 ret = -ENODEV;
821         else
822                 ret = ib_dev->mmap(file->ucontext, vma);
823 out:
824         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
825         return ret;
826 }
827
828 /*
829  * ib_uverbs_open() does not need the BKL:
830  *
831  *  - the ib_uverbs_device structures are properly reference counted and
832  *    everything else is purely local to the file being created, so
833  *    races against other open calls are not a problem;
834  *  - there is no ioctl method to race against;
835  *  - the open method will either immediately run -ENXIO, or all
836  *    required initialization will be done.
837  */
838 static int ib_uverbs_open(struct inode *inode, struct file *filp)
839 {
840         struct ib_uverbs_device *dev;
841         struct ib_uverbs_file *file;
842         struct ib_device *ib_dev;
843         int ret;
844         int module_dependent;
845         int srcu_key;
846
847         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
848         if (!atomic_inc_not_zero(&dev->refcount))
849                 return -ENXIO;
850
851         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
852         mutex_lock(&dev->lists_mutex);
853         ib_dev = srcu_dereference(dev->ib_dev,
854                                   &dev->disassociate_srcu);
855         if (!ib_dev) {
856                 ret = -EIO;
857                 goto err;
858         }
859
860         /* In case IB device supports disassociate ucontext, there is no hard
861          * dependency between uverbs device and its low level device.
862          */
863         module_dependent = !(ib_dev->disassociate_ucontext);
864
865         if (module_dependent) {
866                 if (!try_module_get(ib_dev->owner)) {
867                         ret = -ENODEV;
868                         goto err;
869                 }
870         }
871
872         file = kzalloc(sizeof(*file), GFP_KERNEL);
873         if (!file) {
874                 ret = -ENOMEM;
875                 if (module_dependent)
876                         goto err_module;
877
878                 goto err;
879         }
880
881         file->device     = dev;
882         spin_lock_init(&file->idr_lock);
883         idr_init(&file->idr);
884         file->ucontext   = NULL;
885         file->async_file = NULL;
886         kref_init(&file->ref);
887         mutex_init(&file->mutex);
888         mutex_init(&file->cleanup_mutex);
889
890         filp->private_data = file;
891         kobject_get(&dev->kobj);
892         list_add_tail(&file->list, &dev->uverbs_file_list);
893         mutex_unlock(&dev->lists_mutex);
894         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
895
896         return nonseekable_open(inode, filp);
897
898 err_module:
899         module_put(ib_dev->owner);
900
901 err:
902         mutex_unlock(&dev->lists_mutex);
903         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
904         if (atomic_dec_and_test(&dev->refcount))
905                 ib_uverbs_comp_dev(dev);
906
907         return ret;
908 }
909
910 static int ib_uverbs_close(struct inode *inode, struct file *filp)
911 {
912         struct ib_uverbs_file *file = filp->private_data;
913
914         mutex_lock(&file->cleanup_mutex);
915         if (file->ucontext) {
916                 ib_uverbs_cleanup_ucontext(file, file->ucontext, false);
917                 file->ucontext = NULL;
918         }
919         mutex_unlock(&file->cleanup_mutex);
920         idr_destroy(&file->idr);
921
922         mutex_lock(&file->device->lists_mutex);
923         if (!file->is_closed) {
924                 list_del(&file->list);
925                 file->is_closed = 1;
926         }
927         mutex_unlock(&file->device->lists_mutex);
928
929         if (file->async_file)
930                 kref_put(&file->async_file->ref,
931                          ib_uverbs_release_async_event_file);
932
933         kref_put(&file->ref, ib_uverbs_release_file);
934
935         return 0;
936 }
937
938 static const struct file_operations uverbs_fops = {
939         .owner   = THIS_MODULE,
940         .write   = ib_uverbs_write,
941         .open    = ib_uverbs_open,
942         .release = ib_uverbs_close,
943         .llseek  = no_llseek,
944         .unlocked_ioctl = ib_uverbs_ioctl,
945         .compat_ioctl = ib_uverbs_ioctl,
946 };
947
948 static const struct file_operations uverbs_mmap_fops = {
949         .owner   = THIS_MODULE,
950         .write   = ib_uverbs_write,
951         .mmap    = ib_uverbs_mmap,
952         .open    = ib_uverbs_open,
953         .release = ib_uverbs_close,
954         .llseek  = no_llseek,
955         .unlocked_ioctl = ib_uverbs_ioctl,
956         .compat_ioctl = ib_uverbs_ioctl,
957 };
958
959 static struct ib_client uverbs_client = {
960         .name   = "uverbs",
961         .add    = ib_uverbs_add_one,
962         .remove = ib_uverbs_remove_one
963 };
964
965 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
966                           char *buf)
967 {
968         int ret = -ENODEV;
969         int srcu_key;
970         struct ib_uverbs_device *dev = dev_get_drvdata(device);
971         struct ib_device *ib_dev;
972
973         if (!dev)
974                 return -ENODEV;
975
976         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
977         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
978         if (ib_dev)
979                 ret = sprintf(buf, "%s\n", ib_dev->name);
980         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
981
982         return ret;
983 }
984 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
985
986 static ssize_t show_dev_abi_version(struct device *device,
987                                     struct device_attribute *attr, char *buf)
988 {
989         struct ib_uverbs_device *dev = dev_get_drvdata(device);
990         int ret = -ENODEV;
991         int srcu_key;
992         struct ib_device *ib_dev;
993
994         if (!dev)
995                 return -ENODEV;
996         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
997         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
998         if (ib_dev)
999                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1000         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1001
1002         return ret;
1003 }
1004 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1005
1006 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1007                          __stringify(IB_USER_VERBS_ABI_VERSION));
1008
1009 static void ib_uverbs_add_one(struct ib_device *device)
1010 {
1011         int devnum;
1012         dev_t base;
1013         struct ib_uverbs_device *uverbs_dev;
1014         int ret;
1015
1016         if (!device->alloc_ucontext)
1017                 return;
1018
1019         uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1020         if (!uverbs_dev)
1021                 return;
1022
1023         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1024         if (ret) {
1025                 kfree(uverbs_dev);
1026                 return;
1027         }
1028
1029         atomic_set(&uverbs_dev->refcount, 1);
1030         init_completion(&uverbs_dev->comp);
1031         uverbs_dev->xrcd_tree = RB_ROOT;
1032         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1033         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1034         mutex_init(&uverbs_dev->lists_mutex);
1035         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1036         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1037
1038         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1039         if (devnum >= IB_UVERBS_MAX_DEVICES)
1040                 goto err;
1041         uverbs_dev->devnum = devnum;
1042         set_bit(devnum, dev_map);
1043         if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1044                 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1045         else
1046                 base = IB_UVERBS_BASE_DEV + devnum;
1047
1048         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1049         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1050
1051         cdev_init(&uverbs_dev->cdev, NULL);
1052         uverbs_dev->cdev.owner = THIS_MODULE;
1053         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1054         cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1055         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1056         if (cdev_add(&uverbs_dev->cdev, base, 1))
1057                 goto err_cdev;
1058
1059         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1060                                         uverbs_dev->cdev.dev, uverbs_dev,
1061                                         "uverbs%d", uverbs_dev->devnum);
1062         if (IS_ERR(uverbs_dev->dev))
1063                 goto err_cdev;
1064
1065         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1066                 goto err_class;
1067         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1068                 goto err_class;
1069
1070         if (!device->specs_root) {
1071                 const struct uverbs_object_tree_def *default_root[] = {
1072                         uverbs_default_get_objects()};
1073
1074                 uverbs_dev->specs_root = uverbs_alloc_spec_tree(1,
1075                                                                 default_root);
1076                 if (IS_ERR(uverbs_dev->specs_root))
1077                         goto err_class;
1078
1079                 device->specs_root = uverbs_dev->specs_root;
1080         }
1081
1082         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1083
1084         return;
1085
1086 err_class:
1087         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1088
1089 err_cdev:
1090         cdev_del(&uverbs_dev->cdev);
1091         clear_bit(devnum, dev_map);
1092
1093 err:
1094         if (atomic_dec_and_test(&uverbs_dev->refcount))
1095                 ib_uverbs_comp_dev(uverbs_dev);
1096         wait_for_completion(&uverbs_dev->comp);
1097         kobject_put(&uverbs_dev->kobj);
1098         return;
1099 }
1100
1101 static void ib_uverbs_disassociate_ucontext(struct ib_ucontext *ibcontext)
1102 {
1103         struct ib_device *ib_dev = ibcontext->device;
1104         struct task_struct *owning_process  = NULL;
1105         struct mm_struct   *owning_mm       = NULL;
1106
1107         owning_process = get_pid_task(ibcontext->tgid, PIDTYPE_PID);
1108         if (!owning_process)
1109                 return;
1110
1111         owning_mm = get_task_mm(owning_process);
1112         if (!owning_mm) {
1113                 pr_info("no mm, disassociate ucontext is pending task termination\n");
1114                 while (1) {
1115                         put_task_struct(owning_process);
1116                         usleep_range(1000, 2000);
1117                         owning_process = get_pid_task(ibcontext->tgid,
1118                                                       PIDTYPE_PID);
1119                         if (!owning_process ||
1120                             owning_process->state == TASK_DEAD) {
1121                                 pr_info("disassociate ucontext done, task was terminated\n");
1122                                 /* in case task was dead need to release the
1123                                  * task struct.
1124                                  */
1125                                 if (owning_process)
1126                                         put_task_struct(owning_process);
1127                                 return;
1128                         }
1129                 }
1130         }
1131
1132         down_write(&owning_mm->mmap_sem);
1133         ib_dev->disassociate_ucontext(ibcontext);
1134         up_write(&owning_mm->mmap_sem);
1135         mmput(owning_mm);
1136         put_task_struct(owning_process);
1137 }
1138
1139 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1140                                         struct ib_device *ib_dev)
1141 {
1142         struct ib_uverbs_file *file;
1143         struct ib_uverbs_async_event_file *event_file;
1144         struct ib_event event;
1145
1146         /* Pending running commands to terminate */
1147         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1148         event.event = IB_EVENT_DEVICE_FATAL;
1149         event.element.port_num = 0;
1150         event.device = ib_dev;
1151
1152         mutex_lock(&uverbs_dev->lists_mutex);
1153         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1154                 struct ib_ucontext *ucontext;
1155                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1156                                         struct ib_uverbs_file, list);
1157                 file->is_closed = 1;
1158                 list_del(&file->list);
1159                 kref_get(&file->ref);
1160                 mutex_unlock(&uverbs_dev->lists_mutex);
1161
1162
1163                 mutex_lock(&file->cleanup_mutex);
1164                 ucontext = file->ucontext;
1165                 file->ucontext = NULL;
1166                 mutex_unlock(&file->cleanup_mutex);
1167
1168                 /* At this point ib_uverbs_close cannot be running
1169                  * ib_uverbs_cleanup_ucontext
1170                  */
1171                 if (ucontext) {
1172                         /* We must release the mutex before going ahead and
1173                          * calling disassociate_ucontext. disassociate_ucontext
1174                          * might end up indirectly calling uverbs_close,
1175                          * for example due to freeing the resources
1176                          * (e.g mmput).
1177                          */
1178                         ib_uverbs_event_handler(&file->event_handler, &event);
1179                         ib_uverbs_disassociate_ucontext(ucontext);
1180                         mutex_lock(&file->cleanup_mutex);
1181                         ib_uverbs_cleanup_ucontext(file, ucontext, true);
1182                         mutex_unlock(&file->cleanup_mutex);
1183                 }
1184
1185                 mutex_lock(&uverbs_dev->lists_mutex);
1186                 kref_put(&file->ref, ib_uverbs_release_file);
1187         }
1188
1189         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1190                 event_file = list_first_entry(&uverbs_dev->
1191                                               uverbs_events_file_list,
1192                                               struct ib_uverbs_async_event_file,
1193                                               list);
1194                 spin_lock_irq(&event_file->ev_queue.lock);
1195                 event_file->ev_queue.is_closed = 1;
1196                 spin_unlock_irq(&event_file->ev_queue.lock);
1197
1198                 list_del(&event_file->list);
1199                 ib_unregister_event_handler(
1200                         &event_file->uverbs_file->event_handler);
1201                 event_file->uverbs_file->event_handler.device =
1202                         NULL;
1203
1204                 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1205                 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1206         }
1207         mutex_unlock(&uverbs_dev->lists_mutex);
1208 }
1209
1210 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1211 {
1212         struct ib_uverbs_device *uverbs_dev = client_data;
1213         int wait_clients = 1;
1214
1215         if (!uverbs_dev)
1216                 return;
1217
1218         dev_set_drvdata(uverbs_dev->dev, NULL);
1219         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1220         cdev_del(&uverbs_dev->cdev);
1221         clear_bit(uverbs_dev->devnum, dev_map);
1222
1223         if (device->disassociate_ucontext) {
1224                 /* We disassociate HW resources and immediately return.
1225                  * Userspace will see a EIO errno for all future access.
1226                  * Upon returning, ib_device may be freed internally and is not
1227                  * valid any more.
1228                  * uverbs_device is still available until all clients close
1229                  * their files, then the uverbs device ref count will be zero
1230                  * and its resources will be freed.
1231                  * Note: At this point no more files can be opened since the
1232                  * cdev was deleted, however active clients can still issue
1233                  * commands and close their open files.
1234                  */
1235                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1236                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1237                 wait_clients = 0;
1238         }
1239
1240         if (atomic_dec_and_test(&uverbs_dev->refcount))
1241                 ib_uverbs_comp_dev(uverbs_dev);
1242         if (wait_clients)
1243                 wait_for_completion(&uverbs_dev->comp);
1244         if (uverbs_dev->specs_root) {
1245                 uverbs_free_spec_tree(uverbs_dev->specs_root);
1246                 device->specs_root = NULL;
1247         }
1248
1249         kobject_put(&uverbs_dev->kobj);
1250 }
1251
1252 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1253 {
1254         if (mode)
1255                 *mode = 0666;
1256         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1257 }
1258
1259 static int __init ib_uverbs_init(void)
1260 {
1261         int ret;
1262
1263         ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1264                                      IB_UVERBS_NUM_FIXED_MINOR,
1265                                      "infiniband_verbs");
1266         if (ret) {
1267                 pr_err("user_verbs: couldn't register device number\n");
1268                 goto out;
1269         }
1270
1271         ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1272                                   IB_UVERBS_NUM_DYNAMIC_MINOR,
1273                                   "infiniband_verbs");
1274         if (ret) {
1275                 pr_err("couldn't register dynamic device number\n");
1276                 goto out_alloc;
1277         }
1278
1279         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1280         if (IS_ERR(uverbs_class)) {
1281                 ret = PTR_ERR(uverbs_class);
1282                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1283                 goto out_chrdev;
1284         }
1285
1286         uverbs_class->devnode = uverbs_devnode;
1287
1288         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1289         if (ret) {
1290                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1291                 goto out_class;
1292         }
1293
1294         ret = ib_register_client(&uverbs_client);
1295         if (ret) {
1296                 pr_err("user_verbs: couldn't register client\n");
1297                 goto out_class;
1298         }
1299
1300         return 0;
1301
1302 out_class:
1303         class_destroy(uverbs_class);
1304
1305 out_chrdev:
1306         unregister_chrdev_region(dynamic_uverbs_dev,
1307                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1308
1309 out_alloc:
1310         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1311                                  IB_UVERBS_NUM_FIXED_MINOR);
1312
1313 out:
1314         return ret;
1315 }
1316
1317 static void __exit ib_uverbs_cleanup(void)
1318 {
1319         ib_unregister_client(&uverbs_client);
1320         class_destroy(uverbs_class);
1321         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1322                                  IB_UVERBS_NUM_FIXED_MINOR);
1323         unregister_chrdev_region(dynamic_uverbs_dev,
1324                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1325 }
1326
1327 module_init(ib_uverbs_init);
1328 module_exit(ib_uverbs_cleanup);