Version:  2.0.40 2.2.26 2.4.37 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6

Linux/drivers/infiniband/core/uverbs_main.c

  1 /*
  2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
  3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
  6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
  7  *
  8  * This software is available to you under a choice of one of two
  9  * licenses.  You may choose to be licensed under the terms of the GNU
 10  * General Public License (GPL) Version 2, available from the file
 11  * COPYING in the main directory of this source tree, or the
 12  * OpenIB.org BSD license below:
 13  *
 14  *     Redistribution and use in source and binary forms, with or
 15  *     without modification, are permitted provided that the following
 16  *     conditions are met:
 17  *
 18  *      - Redistributions of source code must retain the above
 19  *        copyright notice, this list of conditions and the following
 20  *        disclaimer.
 21  *
 22  *      - Redistributions in binary form must reproduce the above
 23  *        copyright notice, this list of conditions and the following
 24  *        disclaimer in the documentation and/or other materials
 25  *        provided with the distribution.
 26  *
 27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 34  * SOFTWARE.
 35  */
 36 
 37 #include <linux/module.h>
 38 #include <linux/init.h>
 39 #include <linux/device.h>
 40 #include <linux/err.h>
 41 #include <linux/fs.h>
 42 #include <linux/poll.h>
 43 #include <linux/sched.h>
 44 #include <linux/file.h>
 45 #include <linux/cdev.h>
 46 #include <linux/anon_inodes.h>
 47 #include <linux/slab.h>
 48 
 49 #include <asm/uaccess.h>
 50 
 51 #include <rdma/ib.h>
 52 
 53 #include "uverbs.h"
 54 
 55 MODULE_AUTHOR("Roland Dreier");
 56 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
 57 MODULE_LICENSE("Dual BSD/GPL");
 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 DEFINE_IDR(ib_uverbs_xrcd_idr);
 78 DEFINE_IDR(ib_uverbs_rule_idr);
 79 
 80 static DEFINE_SPINLOCK(map_lock);
 81 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
 82 
 83 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
 84                                      struct ib_device *ib_dev,
 85                                      const char __user *buf, int in_len,
 86                                      int out_len) = {
 87         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
 88         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
 89         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
 90         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
 91         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
 92         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
 93         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
 94         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
 95         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
 96         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
 97         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
 98         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
 99         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
100         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
101         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
102         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
103         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
104         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
105         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
106         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
107         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
108         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
109         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
110         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
111         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
112         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
113         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
114         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
115         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
116         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
117         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
118         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
119         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
120         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
121         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
122 };
123 
124 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
125                                     struct ib_device *ib_dev,
126                                     struct ib_udata *ucore,
127                                     struct ib_udata *uhw) = {
128         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
129         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
130         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
131         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
132         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
133 };
134 
135 static void ib_uverbs_add_one(struct ib_device *device);
136 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
137 
138 int uverbs_dealloc_mw(struct ib_mw *mw)
139 {
140         struct ib_pd *pd = mw->pd;
141         int ret;
142 
143         ret = mw->device->dealloc_mw(mw);
144         if (!ret)
145                 atomic_dec(&pd->usecnt);
146         return ret;
147 }
148 
149 static void ib_uverbs_release_dev(struct kobject *kobj)
150 {
151         struct ib_uverbs_device *dev =
152                 container_of(kobj, struct ib_uverbs_device, kobj);
153 
154         cleanup_srcu_struct(&dev->disassociate_srcu);
155         kfree(dev);
156 }
157 
158 static struct kobj_type ib_uverbs_dev_ktype = {
159         .release = ib_uverbs_release_dev,
160 };
161 
162 static void ib_uverbs_release_event_file(struct kref *ref)
163 {
164         struct ib_uverbs_event_file *file =
165                 container_of(ref, struct ib_uverbs_event_file, ref);
166 
167         kfree(file);
168 }
169 
170 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
171                           struct ib_uverbs_event_file *ev_file,
172                           struct ib_ucq_object *uobj)
173 {
174         struct ib_uverbs_event *evt, *tmp;
175 
176         if (ev_file) {
177                 spin_lock_irq(&ev_file->lock);
178                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
179                         list_del(&evt->list);
180                         kfree(evt);
181                 }
182                 spin_unlock_irq(&ev_file->lock);
183 
184                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
185         }
186 
187         spin_lock_irq(&file->async_file->lock);
188         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
189                 list_del(&evt->list);
190                 kfree(evt);
191         }
192         spin_unlock_irq(&file->async_file->lock);
193 }
194 
195 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
196                               struct ib_uevent_object *uobj)
197 {
198         struct ib_uverbs_event *evt, *tmp;
199 
200         spin_lock_irq(&file->async_file->lock);
201         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
202                 list_del(&evt->list);
203                 kfree(evt);
204         }
205         spin_unlock_irq(&file->async_file->lock);
206 }
207 
208 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
209                                     struct ib_uqp_object *uobj)
210 {
211         struct ib_uverbs_mcast_entry *mcast, *tmp;
212 
213         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
214                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
215                 list_del(&mcast->list);
216                 kfree(mcast);
217         }
218 }
219 
220 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
221                                       struct ib_ucontext *context)
222 {
223         struct ib_uobject *uobj, *tmp;
224 
225         context->closing = 1;
226 
227         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
228                 struct ib_ah *ah = uobj->object;
229 
230                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
231                 ib_destroy_ah(ah);
232                 kfree(uobj);
233         }
234 
235         /* Remove MWs before QPs, in order to support type 2A MWs. */
236         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
237                 struct ib_mw *mw = uobj->object;
238 
239                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
240                 uverbs_dealloc_mw(mw);
241                 kfree(uobj);
242         }
243 
244         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
245                 struct ib_flow *flow_id = uobj->object;
246 
247                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
248                 ib_destroy_flow(flow_id);
249                 kfree(uobj);
250         }
251 
252         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
253                 struct ib_qp *qp = uobj->object;
254                 struct ib_uqp_object *uqp =
255                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
256 
257                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
258                 if (qp != qp->real_qp) {
259                         ib_close_qp(qp);
260                 } else {
261                         ib_uverbs_detach_umcast(qp, uqp);
262                         ib_destroy_qp(qp);
263                 }
264                 ib_uverbs_release_uevent(file, &uqp->uevent);
265                 kfree(uqp);
266         }
267 
268         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
269                 struct ib_srq *srq = uobj->object;
270                 struct ib_uevent_object *uevent =
271                         container_of(uobj, struct ib_uevent_object, uobject);
272 
273                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
274                 ib_destroy_srq(srq);
275                 ib_uverbs_release_uevent(file, uevent);
276                 kfree(uevent);
277         }
278 
279         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
280                 struct ib_cq *cq = uobj->object;
281                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
282                 struct ib_ucq_object *ucq =
283                         container_of(uobj, struct ib_ucq_object, uobject);
284 
285                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
286                 ib_destroy_cq(cq);
287                 ib_uverbs_release_ucq(file, ev_file, ucq);
288                 kfree(ucq);
289         }
290 
291         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
292                 struct ib_mr *mr = uobj->object;
293 
294                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
295                 ib_dereg_mr(mr);
296                 kfree(uobj);
297         }
298 
299         mutex_lock(&file->device->xrcd_tree_mutex);
300         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
301                 struct ib_xrcd *xrcd = uobj->object;
302                 struct ib_uxrcd_object *uxrcd =
303                         container_of(uobj, struct ib_uxrcd_object, uobject);
304 
305                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
306                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
307                 kfree(uxrcd);
308         }
309         mutex_unlock(&file->device->xrcd_tree_mutex);
310 
311         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
312                 struct ib_pd *pd = uobj->object;
313 
314                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
315                 ib_dealloc_pd(pd);
316                 kfree(uobj);
317         }
318 
319         put_pid(context->tgid);
320 
321         return context->device->dealloc_ucontext(context);
322 }
323 
324 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
325 {
326         complete(&dev->comp);
327 }
328 
329 static void ib_uverbs_release_file(struct kref *ref)
330 {
331         struct ib_uverbs_file *file =
332                 container_of(ref, struct ib_uverbs_file, ref);
333         struct ib_device *ib_dev;
334         int srcu_key;
335 
336         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
337         ib_dev = srcu_dereference(file->device->ib_dev,
338                                   &file->device->disassociate_srcu);
339         if (ib_dev && !ib_dev->disassociate_ucontext)
340                 module_put(ib_dev->owner);
341         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
342 
343         if (atomic_dec_and_test(&file->device->refcount))
344                 ib_uverbs_comp_dev(file->device);
345 
346         kfree(file);
347 }
348 
349 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
350                                     size_t count, loff_t *pos)
351 {
352         struct ib_uverbs_event_file *file = filp->private_data;
353         struct ib_uverbs_event *event;
354         int eventsz;
355         int ret = 0;
356 
357         spin_lock_irq(&file->lock);
358 
359         while (list_empty(&file->event_list)) {
360                 spin_unlock_irq(&file->lock);
361 
362                 if (filp->f_flags & O_NONBLOCK)
363                         return -EAGAIN;
364 
365                 if (wait_event_interruptible(file->poll_wait,
366                                              (!list_empty(&file->event_list) ||
367                         /* The barriers built into wait_event_interruptible()
368                          * and wake_up() guarentee this will see the null set
369                          * without using RCU
370                          */
371                                              !file->uverbs_file->device->ib_dev)))
372                         return -ERESTARTSYS;
373 
374                 /* If device was disassociated and no event exists set an error */
375                 if (list_empty(&file->event_list) &&
376                     !file->uverbs_file->device->ib_dev)
377                         return -EIO;
378 
379                 spin_lock_irq(&file->lock);
380         }
381 
382         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
383 
384         if (file->is_async)
385                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
386         else
387                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
388 
389         if (eventsz > count) {
390                 ret   = -EINVAL;
391                 event = NULL;
392         } else {
393                 list_del(file->event_list.next);
394                 if (event->counter) {
395                         ++(*event->counter);
396                         list_del(&event->obj_list);
397                 }
398         }
399 
400         spin_unlock_irq(&file->lock);
401 
402         if (event) {
403                 if (copy_to_user(buf, event, eventsz))
404                         ret = -EFAULT;
405                 else
406                         ret = eventsz;
407         }
408 
409         kfree(event);
410 
411         return ret;
412 }
413 
414 static unsigned int ib_uverbs_event_poll(struct file *filp,
415                                          struct poll_table_struct *wait)
416 {
417         unsigned int pollflags = 0;
418         struct ib_uverbs_event_file *file = filp->private_data;
419 
420         poll_wait(filp, &file->poll_wait, wait);
421 
422         spin_lock_irq(&file->lock);
423         if (!list_empty(&file->event_list))
424                 pollflags = POLLIN | POLLRDNORM;
425         spin_unlock_irq(&file->lock);
426 
427         return pollflags;
428 }
429 
430 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
431 {
432         struct ib_uverbs_event_file *file = filp->private_data;
433 
434         return fasync_helper(fd, filp, on, &file->async_queue);
435 }
436 
437 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
438 {
439         struct ib_uverbs_event_file *file = filp->private_data;
440         struct ib_uverbs_event *entry, *tmp;
441         int closed_already = 0;
442 
443         mutex_lock(&file->uverbs_file->device->lists_mutex);
444         spin_lock_irq(&file->lock);
445         closed_already = file->is_closed;
446         file->is_closed = 1;
447         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
448                 if (entry->counter)
449                         list_del(&entry->obj_list);
450                 kfree(entry);
451         }
452         spin_unlock_irq(&file->lock);
453         if (!closed_already) {
454                 list_del(&file->list);
455                 if (file->is_async)
456                         ib_unregister_event_handler(&file->uverbs_file->
457                                 event_handler);
458         }
459         mutex_unlock(&file->uverbs_file->device->lists_mutex);
460 
461         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
462         kref_put(&file->ref, ib_uverbs_release_event_file);
463 
464         return 0;
465 }
466 
467 static const struct file_operations uverbs_event_fops = {
468         .owner   = THIS_MODULE,
469         .read    = ib_uverbs_event_read,
470         .poll    = ib_uverbs_event_poll,
471         .release = ib_uverbs_event_close,
472         .fasync  = ib_uverbs_event_fasync,
473         .llseek  = no_llseek,
474 };
475 
476 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
477 {
478         struct ib_uverbs_event_file    *file = cq_context;
479         struct ib_ucq_object           *uobj;
480         struct ib_uverbs_event         *entry;
481         unsigned long                   flags;
482 
483         if (!file)
484                 return;
485 
486         spin_lock_irqsave(&file->lock, flags);
487         if (file->is_closed) {
488                 spin_unlock_irqrestore(&file->lock, flags);
489                 return;
490         }
491 
492         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
493         if (!entry) {
494                 spin_unlock_irqrestore(&file->lock, flags);
495                 return;
496         }
497 
498         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
499 
500         entry->desc.comp.cq_handle = cq->uobject->user_handle;
501         entry->counter             = &uobj->comp_events_reported;
502 
503         list_add_tail(&entry->list, &file->event_list);
504         list_add_tail(&entry->obj_list, &uobj->comp_list);
505         spin_unlock_irqrestore(&file->lock, flags);
506 
507         wake_up_interruptible(&file->poll_wait);
508         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
509 }
510 
511 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
512                                     __u64 element, __u64 event,
513                                     struct list_head *obj_list,
514                                     u32 *counter)
515 {
516         struct ib_uverbs_event *entry;
517         unsigned long flags;
518 
519         spin_lock_irqsave(&file->async_file->lock, flags);
520         if (file->async_file->is_closed) {
521                 spin_unlock_irqrestore(&file->async_file->lock, flags);
522                 return;
523         }
524 
525         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
526         if (!entry) {
527                 spin_unlock_irqrestore(&file->async_file->lock, flags);
528                 return;
529         }
530 
531         entry->desc.async.element    = element;
532         entry->desc.async.event_type = event;
533         entry->desc.async.reserved   = 0;
534         entry->counter               = counter;
535 
536         list_add_tail(&entry->list, &file->async_file->event_list);
537         if (obj_list)
538                 list_add_tail(&entry->obj_list, obj_list);
539         spin_unlock_irqrestore(&file->async_file->lock, flags);
540 
541         wake_up_interruptible(&file->async_file->poll_wait);
542         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
543 }
544 
545 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
546 {
547         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
548                                                   struct ib_ucq_object, uobject);
549 
550         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
551                                 event->event, &uobj->async_list,
552                                 &uobj->async_events_reported);
553 }
554 
555 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
556 {
557         struct ib_uevent_object *uobj;
558 
559         /* for XRC target qp's, check that qp is live */
560         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
561                 return;
562 
563         uobj = container_of(event->element.qp->uobject,
564                             struct ib_uevent_object, uobject);
565 
566         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
567                                 event->event, &uobj->event_list,
568                                 &uobj->events_reported);
569 }
570 
571 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
572 {
573         struct ib_uevent_object *uobj;
574 
575         uobj = container_of(event->element.srq->uobject,
576                             struct ib_uevent_object, uobject);
577 
578         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
579                                 event->event, &uobj->event_list,
580                                 &uobj->events_reported);
581 }
582 
583 void ib_uverbs_event_handler(struct ib_event_handler *handler,
584                              struct ib_event *event)
585 {
586         struct ib_uverbs_file *file =
587                 container_of(handler, struct ib_uverbs_file, event_handler);
588 
589         ib_uverbs_async_handler(file, event->element.port_num, event->event,
590                                 NULL, NULL);
591 }
592 
593 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
594 {
595         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
596         file->async_file = NULL;
597 }
598 
599 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
600                                         struct ib_device        *ib_dev,
601                                         int is_async)
602 {
603         struct ib_uverbs_event_file *ev_file;
604         struct file *filp;
605         int ret;
606 
607         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
608         if (!ev_file)
609                 return ERR_PTR(-ENOMEM);
610 
611         kref_init(&ev_file->ref);
612         spin_lock_init(&ev_file->lock);
613         INIT_LIST_HEAD(&ev_file->event_list);
614         init_waitqueue_head(&ev_file->poll_wait);
615         ev_file->uverbs_file = uverbs_file;
616         kref_get(&ev_file->uverbs_file->ref);
617         ev_file->async_queue = NULL;
618         ev_file->is_closed   = 0;
619 
620         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
621                                   ev_file, O_RDONLY);
622         if (IS_ERR(filp))
623                 goto err_put_refs;
624 
625         mutex_lock(&uverbs_file->device->lists_mutex);
626         list_add_tail(&ev_file->list,
627                       &uverbs_file->device->uverbs_events_file_list);
628         mutex_unlock(&uverbs_file->device->lists_mutex);
629 
630         if (is_async) {
631                 WARN_ON(uverbs_file->async_file);
632                 uverbs_file->async_file = ev_file;
633                 kref_get(&uverbs_file->async_file->ref);
634                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
635                                       ib_dev,
636                                       ib_uverbs_event_handler);
637                 ret = ib_register_event_handler(&uverbs_file->event_handler);
638                 if (ret)
639                         goto err_put_file;
640 
641                 /* At that point async file stuff was fully set */
642                 ev_file->is_async = 1;
643         }
644 
645         return filp;
646 
647 err_put_file:
648         fput(filp);
649         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
650         uverbs_file->async_file = NULL;
651         return ERR_PTR(ret);
652 
653 err_put_refs:
654         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
655         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
656         return filp;
657 }
658 
659 /*
660  * Look up a completion event file by FD.  If lookup is successful,
661  * takes a ref to the event file struct that it returns; if
662  * unsuccessful, returns NULL.
663  */
664 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
665 {
666         struct ib_uverbs_event_file *ev_file = NULL;
667         struct fd f = fdget(fd);
668 
669         if (!f.file)
670                 return NULL;
671 
672         if (f.file->f_op != &uverbs_event_fops)
673                 goto out;
674 
675         ev_file = f.file->private_data;
676         if (ev_file->is_async) {
677                 ev_file = NULL;
678                 goto out;
679         }
680 
681         kref_get(&ev_file->ref);
682 
683 out:
684         fdput(f);
685         return ev_file;
686 }
687 
688 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
689 {
690         u64 mask;
691 
692         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
693                 mask = ib_dev->uverbs_cmd_mask;
694         else
695                 mask = ib_dev->uverbs_ex_cmd_mask;
696 
697         if (mask & ((u64)1 << command))
698                 return 0;
699 
700         return -1;
701 }
702 
703 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
704                              size_t count, loff_t *pos)
705 {
706         struct ib_uverbs_file *file = filp->private_data;
707         struct ib_device *ib_dev;
708         struct ib_uverbs_cmd_hdr hdr;
709         __u32 command;
710         __u32 flags;
711         int srcu_key;
712         ssize_t ret;
713 
714         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
715                 return -EACCES;
716 
717         if (count < sizeof hdr)
718                 return -EINVAL;
719 
720         if (copy_from_user(&hdr, buf, sizeof hdr))
721                 return -EFAULT;
722 
723         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
724         ib_dev = srcu_dereference(file->device->ib_dev,
725                                   &file->device->disassociate_srcu);
726         if (!ib_dev) {
727                 ret = -EIO;
728                 goto out;
729         }
730 
731         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
732                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
733                 ret = -EINVAL;
734                 goto out;
735         }
736 
737         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
738         if (verify_command_mask(ib_dev, command)) {
739                 ret = -EOPNOTSUPP;
740                 goto out;
741         }
742 
743         if (!file->ucontext &&
744             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
745                 ret = -EINVAL;
746                 goto out;
747         }
748 
749         flags = (hdr.command &
750                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
751 
752         if (!flags) {
753                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
754                     !uverbs_cmd_table[command]) {
755                         ret = -EINVAL;
756                         goto out;
757                 }
758 
759                 if (hdr.in_words * 4 != count) {
760                         ret = -EINVAL;
761                         goto out;
762                 }
763 
764                 ret = uverbs_cmd_table[command](file, ib_dev,
765                                                  buf + sizeof(hdr),
766                                                  hdr.in_words * 4,
767                                                  hdr.out_words * 4);
768 
769         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
770                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
771                 struct ib_udata ucore;
772                 struct ib_udata uhw;
773                 size_t written_count = count;
774 
775                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
776                     !uverbs_ex_cmd_table[command]) {
777                         ret = -ENOSYS;
778                         goto out;
779                 }
780 
781                 if (!file->ucontext) {
782                         ret = -EINVAL;
783                         goto out;
784                 }
785 
786                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
787                         ret = -EINVAL;
788                         goto out;
789                 }
790 
791                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
792                         ret = -EFAULT;
793                         goto out;
794                 }
795 
796                 count -= sizeof(hdr) + sizeof(ex_hdr);
797                 buf += sizeof(hdr) + sizeof(ex_hdr);
798 
799                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
800                         ret = -EINVAL;
801                         goto out;
802                 }
803 
804                 if (ex_hdr.cmd_hdr_reserved) {
805                         ret = -EINVAL;
806                         goto out;
807                 }
808 
809                 if (ex_hdr.response) {
810                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
811                                 ret = -EINVAL;
812                                 goto out;
813                         }
814 
815                         if (!access_ok(VERIFY_WRITE,
816                                        (void __user *) (unsigned long) ex_hdr.response,
817                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
818                                 ret = -EFAULT;
819                                 goto out;
820                         }
821                 } else {
822                         if (hdr.out_words || ex_hdr.provider_out_words) {
823                                 ret = -EINVAL;
824                                 goto out;
825                         }
826                 }
827 
828                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
829                                        hdr.in_words * 8, hdr.out_words * 8);
830 
831                 INIT_UDATA_BUF_OR_NULL(&uhw,
832                                        buf + ucore.inlen,
833                                        (unsigned long) ex_hdr.response + ucore.outlen,
834                                        ex_hdr.provider_in_words * 8,
835                                        ex_hdr.provider_out_words * 8);
836 
837                 ret = uverbs_ex_cmd_table[command](file,
838                                                    ib_dev,
839                                                    &ucore,
840                                                    &uhw);
841                 if (!ret)
842                         ret = written_count;
843         } else {
844                 ret = -ENOSYS;
845         }
846 
847 out:
848         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
849         return ret;
850 }
851 
852 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
853 {
854         struct ib_uverbs_file *file = filp->private_data;
855         struct ib_device *ib_dev;
856         int ret = 0;
857         int srcu_key;
858 
859         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
860         ib_dev = srcu_dereference(file->device->ib_dev,
861                                   &file->device->disassociate_srcu);
862         if (!ib_dev) {
863                 ret = -EIO;
864                 goto out;
865         }
866 
867         if (!file->ucontext)
868                 ret = -ENODEV;
869         else
870                 ret = ib_dev->mmap(file->ucontext, vma);
871 out:
872         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
873         return ret;
874 }
875 
876 /*
877  * ib_uverbs_open() does not need the BKL:
878  *
879  *  - the ib_uverbs_device structures are properly reference counted and
880  *    everything else is purely local to the file being created, so
881  *    races against other open calls are not a problem;
882  *  - there is no ioctl method to race against;
883  *  - the open method will either immediately run -ENXIO, or all
884  *    required initialization will be done.
885  */
886 static int ib_uverbs_open(struct inode *inode, struct file *filp)
887 {
888         struct ib_uverbs_device *dev;
889         struct ib_uverbs_file *file;
890         struct ib_device *ib_dev;
891         int ret;
892         int module_dependent;
893         int srcu_key;
894 
895         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
896         if (!atomic_inc_not_zero(&dev->refcount))
897                 return -ENXIO;
898 
899         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
900         mutex_lock(&dev->lists_mutex);
901         ib_dev = srcu_dereference(dev->ib_dev,
902                                   &dev->disassociate_srcu);
903         if (!ib_dev) {
904                 ret = -EIO;
905                 goto err;
906         }
907 
908         /* In case IB device supports disassociate ucontext, there is no hard
909          * dependency between uverbs device and its low level device.
910          */
911         module_dependent = !(ib_dev->disassociate_ucontext);
912 
913         if (module_dependent) {
914                 if (!try_module_get(ib_dev->owner)) {
915                         ret = -ENODEV;
916                         goto err;
917                 }
918         }
919 
920         file = kzalloc(sizeof(*file), GFP_KERNEL);
921         if (!file) {
922                 ret = -ENOMEM;
923                 if (module_dependent)
924                         goto err_module;
925 
926                 goto err;
927         }
928 
929         file->device     = dev;
930         file->ucontext   = NULL;
931         file->async_file = NULL;
932         kref_init(&file->ref);
933         mutex_init(&file->mutex);
934 
935         filp->private_data = file;
936         kobject_get(&dev->kobj);
937         list_add_tail(&file->list, &dev->uverbs_file_list);
938         mutex_unlock(&dev->lists_mutex);
939         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
940 
941         return nonseekable_open(inode, filp);
942 
943 err_module:
944         module_put(ib_dev->owner);
945 
946 err:
947         mutex_unlock(&dev->lists_mutex);
948         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
949         if (atomic_dec_and_test(&dev->refcount))
950                 ib_uverbs_comp_dev(dev);
951 
952         return ret;
953 }
954 
955 static int ib_uverbs_close(struct inode *inode, struct file *filp)
956 {
957         struct ib_uverbs_file *file = filp->private_data;
958         struct ib_uverbs_device *dev = file->device;
959         struct ib_ucontext *ucontext = NULL;
960 
961         mutex_lock(&file->device->lists_mutex);
962         ucontext = file->ucontext;
963         file->ucontext = NULL;
964         if (!file->is_closed) {
965                 list_del(&file->list);
966                 file->is_closed = 1;
967         }
968         mutex_unlock(&file->device->lists_mutex);
969         if (ucontext)
970                 ib_uverbs_cleanup_ucontext(file, ucontext);
971 
972         if (file->async_file)
973                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
974 
975         kref_put(&file->ref, ib_uverbs_release_file);
976         kobject_put(&dev->kobj);
977 
978         return 0;
979 }
980 
981 static const struct file_operations uverbs_fops = {
982         .owner   = THIS_MODULE,
983         .write   = ib_uverbs_write,
984         .open    = ib_uverbs_open,
985         .release = ib_uverbs_close,
986         .llseek  = no_llseek,
987 };
988 
989 static const struct file_operations uverbs_mmap_fops = {
990         .owner   = THIS_MODULE,
991         .write   = ib_uverbs_write,
992         .mmap    = ib_uverbs_mmap,
993         .open    = ib_uverbs_open,
994         .release = ib_uverbs_close,
995         .llseek  = no_llseek,
996 };
997 
998 static struct ib_client uverbs_client = {
999         .name   = "uverbs",
1000         .add    = ib_uverbs_add_one,
1001         .remove = ib_uverbs_remove_one
1002 };
1003 
1004 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1005                           char *buf)
1006 {
1007         int ret = -ENODEV;
1008         int srcu_key;
1009         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1010         struct ib_device *ib_dev;
1011 
1012         if (!dev)
1013                 return -ENODEV;
1014 
1015         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1016         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1017         if (ib_dev)
1018                 ret = sprintf(buf, "%s\n", ib_dev->name);
1019         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1020 
1021         return ret;
1022 }
1023 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1024 
1025 static ssize_t show_dev_abi_version(struct device *device,
1026                                     struct device_attribute *attr, char *buf)
1027 {
1028         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1029         int ret = -ENODEV;
1030         int srcu_key;
1031         struct ib_device *ib_dev;
1032 
1033         if (!dev)
1034                 return -ENODEV;
1035         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1036         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1037         if (ib_dev)
1038                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1039         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1040 
1041         return ret;
1042 }
1043 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1044 
1045 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1046                          __stringify(IB_USER_VERBS_ABI_VERSION));
1047 
1048 static dev_t overflow_maj;
1049 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1050 
1051 /*
1052  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1053  * requesting a new major number and doubling the number of max devices we
1054  * support. It's stupid, but simple.
1055  */
1056 static int find_overflow_devnum(void)
1057 {
1058         int ret;
1059 
1060         if (!overflow_maj) {
1061                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1062                                           "infiniband_verbs");
1063                 if (ret) {
1064                         pr_err("user_verbs: couldn't register dynamic device number\n");
1065                         return ret;
1066                 }
1067         }
1068 
1069         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1070         if (ret >= IB_UVERBS_MAX_DEVICES)
1071                 return -1;
1072 
1073         return ret;
1074 }
1075 
1076 static void ib_uverbs_add_one(struct ib_device *device)
1077 {
1078         int devnum;
1079         dev_t base;
1080         struct ib_uverbs_device *uverbs_dev;
1081         int ret;
1082 
1083         if (!device->alloc_ucontext)
1084                 return;
1085 
1086         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1087         if (!uverbs_dev)
1088                 return;
1089 
1090         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1091         if (ret) {
1092                 kfree(uverbs_dev);
1093                 return;
1094         }
1095 
1096         atomic_set(&uverbs_dev->refcount, 1);
1097         init_completion(&uverbs_dev->comp);
1098         uverbs_dev->xrcd_tree = RB_ROOT;
1099         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1100         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1101         mutex_init(&uverbs_dev->lists_mutex);
1102         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1103         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1104 
1105         spin_lock(&map_lock);
1106         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1107         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1108                 spin_unlock(&map_lock);
1109                 devnum = find_overflow_devnum();
1110                 if (devnum < 0)
1111                         goto err;
1112 
1113                 spin_lock(&map_lock);
1114                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1115                 base = devnum + overflow_maj;
1116                 set_bit(devnum, overflow_map);
1117         } else {
1118                 uverbs_dev->devnum = devnum;
1119                 base = devnum + IB_UVERBS_BASE_DEV;
1120                 set_bit(devnum, dev_map);
1121         }
1122         spin_unlock(&map_lock);
1123 
1124         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1125         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1126 
1127         cdev_init(&uverbs_dev->cdev, NULL);
1128         uverbs_dev->cdev.owner = THIS_MODULE;
1129         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1130         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1131         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1132         if (cdev_add(&uverbs_dev->cdev, base, 1))
1133                 goto err_cdev;
1134 
1135         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1136                                         uverbs_dev->cdev.dev, uverbs_dev,
1137                                         "uverbs%d", uverbs_dev->devnum);
1138         if (IS_ERR(uverbs_dev->dev))
1139                 goto err_cdev;
1140 
1141         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1142                 goto err_class;
1143         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1144                 goto err_class;
1145 
1146         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1147 
1148         return;
1149 
1150 err_class:
1151         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1152 
1153 err_cdev:
1154         cdev_del(&uverbs_dev->cdev);
1155         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1156                 clear_bit(devnum, dev_map);
1157         else
1158                 clear_bit(devnum, overflow_map);
1159 
1160 err:
1161         if (atomic_dec_and_test(&uverbs_dev->refcount))
1162                 ib_uverbs_comp_dev(uverbs_dev);
1163         wait_for_completion(&uverbs_dev->comp);
1164         kobject_put(&uverbs_dev->kobj);
1165         return;
1166 }
1167 
1168 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1169                                         struct ib_device *ib_dev)
1170 {
1171         struct ib_uverbs_file *file;
1172         struct ib_uverbs_event_file *event_file;
1173         struct ib_event event;
1174 
1175         /* Pending running commands to terminate */
1176         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1177         event.event = IB_EVENT_DEVICE_FATAL;
1178         event.element.port_num = 0;
1179         event.device = ib_dev;
1180 
1181         mutex_lock(&uverbs_dev->lists_mutex);
1182         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1183                 struct ib_ucontext *ucontext;
1184 
1185                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1186                                         struct ib_uverbs_file, list);
1187                 file->is_closed = 1;
1188                 ucontext = file->ucontext;
1189                 list_del(&file->list);
1190                 file->ucontext = NULL;
1191                 kref_get(&file->ref);
1192                 mutex_unlock(&uverbs_dev->lists_mutex);
1193                 /* We must release the mutex before going ahead and calling
1194                  * disassociate_ucontext. disassociate_ucontext might end up
1195                  * indirectly calling uverbs_close, for example due to freeing
1196                  * the resources (e.g mmput).
1197                  */
1198                 ib_uverbs_event_handler(&file->event_handler, &event);
1199                 if (ucontext) {
1200                         ib_dev->disassociate_ucontext(ucontext);
1201                         ib_uverbs_cleanup_ucontext(file, ucontext);
1202                 }
1203 
1204                 mutex_lock(&uverbs_dev->lists_mutex);
1205                 kref_put(&file->ref, ib_uverbs_release_file);
1206         }
1207 
1208         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1209                 event_file = list_first_entry(&uverbs_dev->
1210                                               uverbs_events_file_list,
1211                                               struct ib_uverbs_event_file,
1212                                               list);
1213                 spin_lock_irq(&event_file->lock);
1214                 event_file->is_closed = 1;
1215                 spin_unlock_irq(&event_file->lock);
1216 
1217                 list_del(&event_file->list);
1218                 if (event_file->is_async) {
1219                         ib_unregister_event_handler(&event_file->uverbs_file->
1220                                                     event_handler);
1221                         event_file->uverbs_file->event_handler.device = NULL;
1222                 }
1223 
1224                 wake_up_interruptible(&event_file->poll_wait);
1225                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1226         }
1227         mutex_unlock(&uverbs_dev->lists_mutex);
1228 }
1229 
1230 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1231 {
1232         struct ib_uverbs_device *uverbs_dev = client_data;
1233         int wait_clients = 1;
1234 
1235         if (!uverbs_dev)
1236                 return;
1237 
1238         dev_set_drvdata(uverbs_dev->dev, NULL);
1239         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1240         cdev_del(&uverbs_dev->cdev);
1241 
1242         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1243                 clear_bit(uverbs_dev->devnum, dev_map);
1244         else
1245                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1246 
1247         if (device->disassociate_ucontext) {
1248                 /* We disassociate HW resources and immediately return.
1249                  * Userspace will see a EIO errno for all future access.
1250                  * Upon returning, ib_device may be freed internally and is not
1251                  * valid any more.
1252                  * uverbs_device is still available until all clients close
1253                  * their files, then the uverbs device ref count will be zero
1254                  * and its resources will be freed.
1255                  * Note: At this point no more files can be opened since the
1256                  * cdev was deleted, however active clients can still issue
1257                  * commands and close their open files.
1258                  */
1259                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1260                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1261                 wait_clients = 0;
1262         }
1263 
1264         if (atomic_dec_and_test(&uverbs_dev->refcount))
1265                 ib_uverbs_comp_dev(uverbs_dev);
1266         if (wait_clients)
1267                 wait_for_completion(&uverbs_dev->comp);
1268         kobject_put(&uverbs_dev->kobj);
1269 }
1270 
1271 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1272 {
1273         if (mode)
1274                 *mode = 0666;
1275         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1276 }
1277 
1278 static int __init ib_uverbs_init(void)
1279 {
1280         int ret;
1281 
1282         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1283                                      "infiniband_verbs");
1284         if (ret) {
1285                 pr_err("user_verbs: couldn't register device number\n");
1286                 goto out;
1287         }
1288 
1289         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1290         if (IS_ERR(uverbs_class)) {
1291                 ret = PTR_ERR(uverbs_class);
1292                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1293                 goto out_chrdev;
1294         }
1295 
1296         uverbs_class->devnode = uverbs_devnode;
1297 
1298         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1299         if (ret) {
1300                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1301                 goto out_class;
1302         }
1303 
1304         ret = ib_register_client(&uverbs_client);
1305         if (ret) {
1306                 pr_err("user_verbs: couldn't register client\n");
1307                 goto out_class;
1308         }
1309 
1310         return 0;
1311 
1312 out_class:
1313         class_destroy(uverbs_class);
1314 
1315 out_chrdev:
1316         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1317 
1318 out:
1319         return ret;
1320 }
1321 
1322 static void __exit ib_uverbs_cleanup(void)
1323 {
1324         ib_unregister_client(&uverbs_client);
1325         class_destroy(uverbs_class);
1326         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1327         if (overflow_maj)
1328                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1329         idr_destroy(&ib_uverbs_pd_idr);
1330         idr_destroy(&ib_uverbs_mr_idr);
1331         idr_destroy(&ib_uverbs_mw_idr);
1332         idr_destroy(&ib_uverbs_ah_idr);
1333         idr_destroy(&ib_uverbs_cq_idr);
1334         idr_destroy(&ib_uverbs_qp_idr);
1335         idr_destroy(&ib_uverbs_srq_idr);
1336 }
1337 
1338 module_init(ib_uverbs_init);
1339 module_exit(ib_uverbs_cleanup);
1340 

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