Version:  2.0.40 2.2.26 2.4.37 3.8 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

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 "uverbs.h"
 52 
 53 MODULE_AUTHOR("Roland Dreier");
 54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
 55 MODULE_LICENSE("Dual BSD/GPL");
 56 
 57 enum {
 58         IB_UVERBS_MAJOR       = 231,
 59         IB_UVERBS_BASE_MINOR  = 192,
 60         IB_UVERBS_MAX_DEVICES = 32
 61 };
 62 
 63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
 64 
 65 static struct class *uverbs_class;
 66 
 67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
 68 DEFINE_IDR(ib_uverbs_pd_idr);
 69 DEFINE_IDR(ib_uverbs_mr_idr);
 70 DEFINE_IDR(ib_uverbs_mw_idr);
 71 DEFINE_IDR(ib_uverbs_ah_idr);
 72 DEFINE_IDR(ib_uverbs_cq_idr);
 73 DEFINE_IDR(ib_uverbs_qp_idr);
 74 DEFINE_IDR(ib_uverbs_srq_idr);
 75 DEFINE_IDR(ib_uverbs_xrcd_idr);
 76 DEFINE_IDR(ib_uverbs_rule_idr);
 77 
 78 static DEFINE_SPINLOCK(map_lock);
 79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
 80 
 81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
 82                                      struct ib_device *ib_dev,
 83                                      const char __user *buf, int in_len,
 84                                      int out_len) = {
 85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
 86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
 87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
 88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
 89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
 90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
 91         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
 92         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
 93         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
 94         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
 95         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
 96         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
 97         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
 98         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
 99         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
100         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
101         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
102         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
103         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
104         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
105         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
106         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
107         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
108         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
109         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
110         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
111         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
112         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
113         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
114         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
115         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
116         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
117         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
118         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
119         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
120 };
121 
122 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
123                                     struct ib_device *ib_dev,
124                                     struct ib_udata *ucore,
125                                     struct ib_udata *uhw) = {
126         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
127         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
128         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
129         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
130         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
131 };
132 
133 static void ib_uverbs_add_one(struct ib_device *device);
134 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
135 
136 static void ib_uverbs_release_dev(struct kobject *kobj)
137 {
138         struct ib_uverbs_device *dev =
139                 container_of(kobj, struct ib_uverbs_device, kobj);
140 
141         cleanup_srcu_struct(&dev->disassociate_srcu);
142         kfree(dev);
143 }
144 
145 static struct kobj_type ib_uverbs_dev_ktype = {
146         .release = ib_uverbs_release_dev,
147 };
148 
149 static void ib_uverbs_release_event_file(struct kref *ref)
150 {
151         struct ib_uverbs_event_file *file =
152                 container_of(ref, struct ib_uverbs_event_file, ref);
153 
154         kfree(file);
155 }
156 
157 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
158                           struct ib_uverbs_event_file *ev_file,
159                           struct ib_ucq_object *uobj)
160 {
161         struct ib_uverbs_event *evt, *tmp;
162 
163         if (ev_file) {
164                 spin_lock_irq(&ev_file->lock);
165                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
166                         list_del(&evt->list);
167                         kfree(evt);
168                 }
169                 spin_unlock_irq(&ev_file->lock);
170 
171                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
172         }
173 
174         spin_lock_irq(&file->async_file->lock);
175         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
176                 list_del(&evt->list);
177                 kfree(evt);
178         }
179         spin_unlock_irq(&file->async_file->lock);
180 }
181 
182 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
183                               struct ib_uevent_object *uobj)
184 {
185         struct ib_uverbs_event *evt, *tmp;
186 
187         spin_lock_irq(&file->async_file->lock);
188         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
189                 list_del(&evt->list);
190                 kfree(evt);
191         }
192         spin_unlock_irq(&file->async_file->lock);
193 }
194 
195 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
196                                     struct ib_uqp_object *uobj)
197 {
198         struct ib_uverbs_mcast_entry *mcast, *tmp;
199 
200         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
201                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
202                 list_del(&mcast->list);
203                 kfree(mcast);
204         }
205 }
206 
207 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
208                                       struct ib_ucontext *context)
209 {
210         struct ib_uobject *uobj, *tmp;
211 
212         context->closing = 1;
213 
214         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
215                 struct ib_ah *ah = uobj->object;
216 
217                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
218                 ib_destroy_ah(ah);
219                 kfree(uobj);
220         }
221 
222         /* Remove MWs before QPs, in order to support type 2A MWs. */
223         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
224                 struct ib_mw *mw = uobj->object;
225 
226                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
227                 ib_dealloc_mw(mw);
228                 kfree(uobj);
229         }
230 
231         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
232                 struct ib_flow *flow_id = uobj->object;
233 
234                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
235                 ib_destroy_flow(flow_id);
236                 kfree(uobj);
237         }
238 
239         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
240                 struct ib_qp *qp = uobj->object;
241                 struct ib_uqp_object *uqp =
242                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
243 
244                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
245                 if (qp != qp->real_qp) {
246                         ib_close_qp(qp);
247                 } else {
248                         ib_uverbs_detach_umcast(qp, uqp);
249                         ib_destroy_qp(qp);
250                 }
251                 ib_uverbs_release_uevent(file, &uqp->uevent);
252                 kfree(uqp);
253         }
254 
255         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
256                 struct ib_srq *srq = uobj->object;
257                 struct ib_uevent_object *uevent =
258                         container_of(uobj, struct ib_uevent_object, uobject);
259 
260                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
261                 ib_destroy_srq(srq);
262                 ib_uverbs_release_uevent(file, uevent);
263                 kfree(uevent);
264         }
265 
266         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
267                 struct ib_cq *cq = uobj->object;
268                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
269                 struct ib_ucq_object *ucq =
270                         container_of(uobj, struct ib_ucq_object, uobject);
271 
272                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
273                 ib_destroy_cq(cq);
274                 ib_uverbs_release_ucq(file, ev_file, ucq);
275                 kfree(ucq);
276         }
277 
278         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
279                 struct ib_mr *mr = uobj->object;
280 
281                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
282                 ib_dereg_mr(mr);
283                 kfree(uobj);
284         }
285 
286         mutex_lock(&file->device->xrcd_tree_mutex);
287         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
288                 struct ib_xrcd *xrcd = uobj->object;
289                 struct ib_uxrcd_object *uxrcd =
290                         container_of(uobj, struct ib_uxrcd_object, uobject);
291 
292                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
293                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
294                 kfree(uxrcd);
295         }
296         mutex_unlock(&file->device->xrcd_tree_mutex);
297 
298         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
299                 struct ib_pd *pd = uobj->object;
300 
301                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
302                 ib_dealloc_pd(pd);
303                 kfree(uobj);
304         }
305 
306         put_pid(context->tgid);
307 
308         return context->device->dealloc_ucontext(context);
309 }
310 
311 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
312 {
313         complete(&dev->comp);
314 }
315 
316 static void ib_uverbs_release_file(struct kref *ref)
317 {
318         struct ib_uverbs_file *file =
319                 container_of(ref, struct ib_uverbs_file, ref);
320         struct ib_device *ib_dev;
321         int srcu_key;
322 
323         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
324         ib_dev = srcu_dereference(file->device->ib_dev,
325                                   &file->device->disassociate_srcu);
326         if (ib_dev && !ib_dev->disassociate_ucontext)
327                 module_put(ib_dev->owner);
328         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
329 
330         if (atomic_dec_and_test(&file->device->refcount))
331                 ib_uverbs_comp_dev(file->device);
332 
333         kfree(file);
334 }
335 
336 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
337                                     size_t count, loff_t *pos)
338 {
339         struct ib_uverbs_event_file *file = filp->private_data;
340         struct ib_uverbs_event *event;
341         int eventsz;
342         int ret = 0;
343 
344         spin_lock_irq(&file->lock);
345 
346         while (list_empty(&file->event_list)) {
347                 spin_unlock_irq(&file->lock);
348 
349                 if (filp->f_flags & O_NONBLOCK)
350                         return -EAGAIN;
351 
352                 if (wait_event_interruptible(file->poll_wait,
353                                              (!list_empty(&file->event_list) ||
354                         /* The barriers built into wait_event_interruptible()
355                          * and wake_up() guarentee this will see the null set
356                          * without using RCU
357                          */
358                                              !file->uverbs_file->device->ib_dev)))
359                         return -ERESTARTSYS;
360 
361                 /* If device was disassociated and no event exists set an error */
362                 if (list_empty(&file->event_list) &&
363                     !file->uverbs_file->device->ib_dev)
364                         return -EIO;
365 
366                 spin_lock_irq(&file->lock);
367         }
368 
369         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
370 
371         if (file->is_async)
372                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
373         else
374                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
375 
376         if (eventsz > count) {
377                 ret   = -EINVAL;
378                 event = NULL;
379         } else {
380                 list_del(file->event_list.next);
381                 if (event->counter) {
382                         ++(*event->counter);
383                         list_del(&event->obj_list);
384                 }
385         }
386 
387         spin_unlock_irq(&file->lock);
388 
389         if (event) {
390                 if (copy_to_user(buf, event, eventsz))
391                         ret = -EFAULT;
392                 else
393                         ret = eventsz;
394         }
395 
396         kfree(event);
397 
398         return ret;
399 }
400 
401 static unsigned int ib_uverbs_event_poll(struct file *filp,
402                                          struct poll_table_struct *wait)
403 {
404         unsigned int pollflags = 0;
405         struct ib_uverbs_event_file *file = filp->private_data;
406 
407         poll_wait(filp, &file->poll_wait, wait);
408 
409         spin_lock_irq(&file->lock);
410         if (!list_empty(&file->event_list))
411                 pollflags = POLLIN | POLLRDNORM;
412         spin_unlock_irq(&file->lock);
413 
414         return pollflags;
415 }
416 
417 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
418 {
419         struct ib_uverbs_event_file *file = filp->private_data;
420 
421         return fasync_helper(fd, filp, on, &file->async_queue);
422 }
423 
424 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
425 {
426         struct ib_uverbs_event_file *file = filp->private_data;
427         struct ib_uverbs_event *entry, *tmp;
428         int closed_already = 0;
429 
430         mutex_lock(&file->uverbs_file->device->lists_mutex);
431         spin_lock_irq(&file->lock);
432         closed_already = file->is_closed;
433         file->is_closed = 1;
434         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
435                 if (entry->counter)
436                         list_del(&entry->obj_list);
437                 kfree(entry);
438         }
439         spin_unlock_irq(&file->lock);
440         if (!closed_already) {
441                 list_del(&file->list);
442                 if (file->is_async)
443                         ib_unregister_event_handler(&file->uverbs_file->
444                                 event_handler);
445         }
446         mutex_unlock(&file->uverbs_file->device->lists_mutex);
447 
448         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
449         kref_put(&file->ref, ib_uverbs_release_event_file);
450 
451         return 0;
452 }
453 
454 static const struct file_operations uverbs_event_fops = {
455         .owner   = THIS_MODULE,
456         .read    = ib_uverbs_event_read,
457         .poll    = ib_uverbs_event_poll,
458         .release = ib_uverbs_event_close,
459         .fasync  = ib_uverbs_event_fasync,
460         .llseek  = no_llseek,
461 };
462 
463 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
464 {
465         struct ib_uverbs_event_file    *file = cq_context;
466         struct ib_ucq_object           *uobj;
467         struct ib_uverbs_event         *entry;
468         unsigned long                   flags;
469 
470         if (!file)
471                 return;
472 
473         spin_lock_irqsave(&file->lock, flags);
474         if (file->is_closed) {
475                 spin_unlock_irqrestore(&file->lock, flags);
476                 return;
477         }
478 
479         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
480         if (!entry) {
481                 spin_unlock_irqrestore(&file->lock, flags);
482                 return;
483         }
484 
485         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
486 
487         entry->desc.comp.cq_handle = cq->uobject->user_handle;
488         entry->counter             = &uobj->comp_events_reported;
489 
490         list_add_tail(&entry->list, &file->event_list);
491         list_add_tail(&entry->obj_list, &uobj->comp_list);
492         spin_unlock_irqrestore(&file->lock, flags);
493 
494         wake_up_interruptible(&file->poll_wait);
495         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
496 }
497 
498 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
499                                     __u64 element, __u64 event,
500                                     struct list_head *obj_list,
501                                     u32 *counter)
502 {
503         struct ib_uverbs_event *entry;
504         unsigned long flags;
505 
506         spin_lock_irqsave(&file->async_file->lock, flags);
507         if (file->async_file->is_closed) {
508                 spin_unlock_irqrestore(&file->async_file->lock, flags);
509                 return;
510         }
511 
512         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
513         if (!entry) {
514                 spin_unlock_irqrestore(&file->async_file->lock, flags);
515                 return;
516         }
517 
518         entry->desc.async.element    = element;
519         entry->desc.async.event_type = event;
520         entry->desc.async.reserved   = 0;
521         entry->counter               = counter;
522 
523         list_add_tail(&entry->list, &file->async_file->event_list);
524         if (obj_list)
525                 list_add_tail(&entry->obj_list, obj_list);
526         spin_unlock_irqrestore(&file->async_file->lock, flags);
527 
528         wake_up_interruptible(&file->async_file->poll_wait);
529         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
530 }
531 
532 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
533 {
534         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
535                                                   struct ib_ucq_object, uobject);
536 
537         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
538                                 event->event, &uobj->async_list,
539                                 &uobj->async_events_reported);
540 }
541 
542 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
543 {
544         struct ib_uevent_object *uobj;
545 
546         /* for XRC target qp's, check that qp is live */
547         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
548                 return;
549 
550         uobj = container_of(event->element.qp->uobject,
551                             struct ib_uevent_object, uobject);
552 
553         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
554                                 event->event, &uobj->event_list,
555                                 &uobj->events_reported);
556 }
557 
558 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
559 {
560         struct ib_uevent_object *uobj;
561 
562         uobj = container_of(event->element.srq->uobject,
563                             struct ib_uevent_object, uobject);
564 
565         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
566                                 event->event, &uobj->event_list,
567                                 &uobj->events_reported);
568 }
569 
570 void ib_uverbs_event_handler(struct ib_event_handler *handler,
571                              struct ib_event *event)
572 {
573         struct ib_uverbs_file *file =
574                 container_of(handler, struct ib_uverbs_file, event_handler);
575 
576         ib_uverbs_async_handler(file, event->element.port_num, event->event,
577                                 NULL, NULL);
578 }
579 
580 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
581 {
582         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
583         file->async_file = NULL;
584 }
585 
586 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
587                                         struct ib_device        *ib_dev,
588                                         int is_async)
589 {
590         struct ib_uverbs_event_file *ev_file;
591         struct file *filp;
592         int ret;
593 
594         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
595         if (!ev_file)
596                 return ERR_PTR(-ENOMEM);
597 
598         kref_init(&ev_file->ref);
599         spin_lock_init(&ev_file->lock);
600         INIT_LIST_HEAD(&ev_file->event_list);
601         init_waitqueue_head(&ev_file->poll_wait);
602         ev_file->uverbs_file = uverbs_file;
603         kref_get(&ev_file->uverbs_file->ref);
604         ev_file->async_queue = NULL;
605         ev_file->is_closed   = 0;
606 
607         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
608                                   ev_file, O_RDONLY);
609         if (IS_ERR(filp))
610                 goto err_put_refs;
611 
612         mutex_lock(&uverbs_file->device->lists_mutex);
613         list_add_tail(&ev_file->list,
614                       &uverbs_file->device->uverbs_events_file_list);
615         mutex_unlock(&uverbs_file->device->lists_mutex);
616 
617         if (is_async) {
618                 WARN_ON(uverbs_file->async_file);
619                 uverbs_file->async_file = ev_file;
620                 kref_get(&uverbs_file->async_file->ref);
621                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
622                                       ib_dev,
623                                       ib_uverbs_event_handler);
624                 ret = ib_register_event_handler(&uverbs_file->event_handler);
625                 if (ret)
626                         goto err_put_file;
627 
628                 /* At that point async file stuff was fully set */
629                 ev_file->is_async = 1;
630         }
631 
632         return filp;
633 
634 err_put_file:
635         fput(filp);
636         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
637         uverbs_file->async_file = NULL;
638         return ERR_PTR(ret);
639 
640 err_put_refs:
641         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
642         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
643         return filp;
644 }
645 
646 /*
647  * Look up a completion event file by FD.  If lookup is successful,
648  * takes a ref to the event file struct that it returns; if
649  * unsuccessful, returns NULL.
650  */
651 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
652 {
653         struct ib_uverbs_event_file *ev_file = NULL;
654         struct fd f = fdget(fd);
655 
656         if (!f.file)
657                 return NULL;
658 
659         if (f.file->f_op != &uverbs_event_fops)
660                 goto out;
661 
662         ev_file = f.file->private_data;
663         if (ev_file->is_async) {
664                 ev_file = NULL;
665                 goto out;
666         }
667 
668         kref_get(&ev_file->ref);
669 
670 out:
671         fdput(f);
672         return ev_file;
673 }
674 
675 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
676                              size_t count, loff_t *pos)
677 {
678         struct ib_uverbs_file *file = filp->private_data;
679         struct ib_device *ib_dev;
680         struct ib_uverbs_cmd_hdr hdr;
681         __u32 flags;
682         int srcu_key;
683         ssize_t ret;
684 
685         if (count < sizeof hdr)
686                 return -EINVAL;
687 
688         if (copy_from_user(&hdr, buf, sizeof hdr))
689                 return -EFAULT;
690 
691         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
692         ib_dev = srcu_dereference(file->device->ib_dev,
693                                   &file->device->disassociate_srcu);
694         if (!ib_dev) {
695                 ret = -EIO;
696                 goto out;
697         }
698 
699         flags = (hdr.command &
700                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
701 
702         if (!flags) {
703                 __u32 command;
704 
705                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
706                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
707                         ret = -EINVAL;
708                         goto out;
709                 }
710 
711                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
712 
713                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
714                     !uverbs_cmd_table[command]) {
715                         ret = -EINVAL;
716                         goto out;
717                 }
718 
719                 if (!file->ucontext &&
720                     command != IB_USER_VERBS_CMD_GET_CONTEXT) {
721                         ret = -EINVAL;
722                         goto out;
723                 }
724 
725                 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
726                         ret = -ENOSYS;
727                         goto out;
728                 }
729 
730                 if (hdr.in_words * 4 != count) {
731                         ret = -EINVAL;
732                         goto out;
733                 }
734 
735                 ret = uverbs_cmd_table[command](file, ib_dev,
736                                                  buf + sizeof(hdr),
737                                                  hdr.in_words * 4,
738                                                  hdr.out_words * 4);
739 
740         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
741                 __u32 command;
742 
743                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
744                 struct ib_udata ucore;
745                 struct ib_udata uhw;
746                 size_t written_count = count;
747 
748                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
749                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
750                         ret = -EINVAL;
751                         goto out;
752                 }
753 
754                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
755 
756                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
757                     !uverbs_ex_cmd_table[command]) {
758                         ret = -ENOSYS;
759                         goto out;
760                 }
761 
762                 if (!file->ucontext) {
763                         ret = -EINVAL;
764                         goto out;
765                 }
766 
767                 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
768                         ret = -ENOSYS;
769                         goto out;
770                 }
771 
772                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
773                         ret = -EINVAL;
774                         goto out;
775                 }
776 
777                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
778                         ret = -EFAULT;
779                         goto out;
780                 }
781 
782                 count -= sizeof(hdr) + sizeof(ex_hdr);
783                 buf += sizeof(hdr) + sizeof(ex_hdr);
784 
785                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
786                         ret = -EINVAL;
787                         goto out;
788                 }
789 
790                 if (ex_hdr.cmd_hdr_reserved) {
791                         ret = -EINVAL;
792                         goto out;
793                 }
794 
795                 if (ex_hdr.response) {
796                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
797                                 ret = -EINVAL;
798                                 goto out;
799                         }
800 
801                         if (!access_ok(VERIFY_WRITE,
802                                        (void __user *) (unsigned long) ex_hdr.response,
803                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
804                                 ret = -EFAULT;
805                                 goto out;
806                         }
807                 } else {
808                         if (hdr.out_words || ex_hdr.provider_out_words) {
809                                 ret = -EINVAL;
810                                 goto out;
811                         }
812                 }
813 
814                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
815                                        hdr.in_words * 8, hdr.out_words * 8);
816 
817                 INIT_UDATA_BUF_OR_NULL(&uhw,
818                                        buf + ucore.inlen,
819                                        (unsigned long) ex_hdr.response + ucore.outlen,
820                                        ex_hdr.provider_in_words * 8,
821                                        ex_hdr.provider_out_words * 8);
822 
823                 ret = uverbs_ex_cmd_table[command](file,
824                                                    ib_dev,
825                                                    &ucore,
826                                                    &uhw);
827                 if (!ret)
828                         ret = written_count;
829         } else {
830                 ret = -ENOSYS;
831         }
832 
833 out:
834         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
835         return ret;
836 }
837 
838 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
839 {
840         struct ib_uverbs_file *file = filp->private_data;
841         struct ib_device *ib_dev;
842         int ret = 0;
843         int srcu_key;
844 
845         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
846         ib_dev = srcu_dereference(file->device->ib_dev,
847                                   &file->device->disassociate_srcu);
848         if (!ib_dev) {
849                 ret = -EIO;
850                 goto out;
851         }
852 
853         if (!file->ucontext)
854                 ret = -ENODEV;
855         else
856                 ret = ib_dev->mmap(file->ucontext, vma);
857 out:
858         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
859         return ret;
860 }
861 
862 /*
863  * ib_uverbs_open() does not need the BKL:
864  *
865  *  - the ib_uverbs_device structures are properly reference counted and
866  *    everything else is purely local to the file being created, so
867  *    races against other open calls are not a problem;
868  *  - there is no ioctl method to race against;
869  *  - the open method will either immediately run -ENXIO, or all
870  *    required initialization will be done.
871  */
872 static int ib_uverbs_open(struct inode *inode, struct file *filp)
873 {
874         struct ib_uverbs_device *dev;
875         struct ib_uverbs_file *file;
876         struct ib_device *ib_dev;
877         int ret;
878         int module_dependent;
879         int srcu_key;
880 
881         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
882         if (!atomic_inc_not_zero(&dev->refcount))
883                 return -ENXIO;
884 
885         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
886         mutex_lock(&dev->lists_mutex);
887         ib_dev = srcu_dereference(dev->ib_dev,
888                                   &dev->disassociate_srcu);
889         if (!ib_dev) {
890                 ret = -EIO;
891                 goto err;
892         }
893 
894         /* In case IB device supports disassociate ucontext, there is no hard
895          * dependency between uverbs device and its low level device.
896          */
897         module_dependent = !(ib_dev->disassociate_ucontext);
898 
899         if (module_dependent) {
900                 if (!try_module_get(ib_dev->owner)) {
901                         ret = -ENODEV;
902                         goto err;
903                 }
904         }
905 
906         file = kzalloc(sizeof(*file), GFP_KERNEL);
907         if (!file) {
908                 ret = -ENOMEM;
909                 if (module_dependent)
910                         goto err_module;
911 
912                 goto err;
913         }
914 
915         file->device     = dev;
916         file->ucontext   = NULL;
917         file->async_file = NULL;
918         kref_init(&file->ref);
919         mutex_init(&file->mutex);
920 
921         filp->private_data = file;
922         kobject_get(&dev->kobj);
923         list_add_tail(&file->list, &dev->uverbs_file_list);
924         mutex_unlock(&dev->lists_mutex);
925         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
926 
927         return nonseekable_open(inode, filp);
928 
929 err_module:
930         module_put(ib_dev->owner);
931 
932 err:
933         mutex_unlock(&dev->lists_mutex);
934         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
935         if (atomic_dec_and_test(&dev->refcount))
936                 ib_uverbs_comp_dev(dev);
937 
938         return ret;
939 }
940 
941 static int ib_uverbs_close(struct inode *inode, struct file *filp)
942 {
943         struct ib_uverbs_file *file = filp->private_data;
944         struct ib_uverbs_device *dev = file->device;
945         struct ib_ucontext *ucontext = NULL;
946 
947         mutex_lock(&file->device->lists_mutex);
948         ucontext = file->ucontext;
949         file->ucontext = NULL;
950         if (!file->is_closed) {
951                 list_del(&file->list);
952                 file->is_closed = 1;
953         }
954         mutex_unlock(&file->device->lists_mutex);
955         if (ucontext)
956                 ib_uverbs_cleanup_ucontext(file, ucontext);
957 
958         if (file->async_file)
959                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
960 
961         kref_put(&file->ref, ib_uverbs_release_file);
962         kobject_put(&dev->kobj);
963 
964         return 0;
965 }
966 
967 static const struct file_operations uverbs_fops = {
968         .owner   = THIS_MODULE,
969         .write   = ib_uverbs_write,
970         .open    = ib_uverbs_open,
971         .release = ib_uverbs_close,
972         .llseek  = no_llseek,
973 };
974 
975 static const struct file_operations uverbs_mmap_fops = {
976         .owner   = THIS_MODULE,
977         .write   = ib_uverbs_write,
978         .mmap    = ib_uverbs_mmap,
979         .open    = ib_uverbs_open,
980         .release = ib_uverbs_close,
981         .llseek  = no_llseek,
982 };
983 
984 static struct ib_client uverbs_client = {
985         .name   = "uverbs",
986         .add    = ib_uverbs_add_one,
987         .remove = ib_uverbs_remove_one
988 };
989 
990 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
991                           char *buf)
992 {
993         int ret = -ENODEV;
994         int srcu_key;
995         struct ib_uverbs_device *dev = dev_get_drvdata(device);
996         struct ib_device *ib_dev;
997 
998         if (!dev)
999                 return -ENODEV;
1000 
1001         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1002         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1003         if (ib_dev)
1004                 ret = sprintf(buf, "%s\n", ib_dev->name);
1005         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1006 
1007         return ret;
1008 }
1009 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1010 
1011 static ssize_t show_dev_abi_version(struct device *device,
1012                                     struct device_attribute *attr, char *buf)
1013 {
1014         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1015         int ret = -ENODEV;
1016         int srcu_key;
1017         struct ib_device *ib_dev;
1018 
1019         if (!dev)
1020                 return -ENODEV;
1021         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1022         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1023         if (ib_dev)
1024                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1025         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1026 
1027         return ret;
1028 }
1029 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1030 
1031 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1032                          __stringify(IB_USER_VERBS_ABI_VERSION));
1033 
1034 static dev_t overflow_maj;
1035 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1036 
1037 /*
1038  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1039  * requesting a new major number and doubling the number of max devices we
1040  * support. It's stupid, but simple.
1041  */
1042 static int find_overflow_devnum(void)
1043 {
1044         int ret;
1045 
1046         if (!overflow_maj) {
1047                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1048                                           "infiniband_verbs");
1049                 if (ret) {
1050                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
1051                         return ret;
1052                 }
1053         }
1054 
1055         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1056         if (ret >= IB_UVERBS_MAX_DEVICES)
1057                 return -1;
1058 
1059         return ret;
1060 }
1061 
1062 static void ib_uverbs_add_one(struct ib_device *device)
1063 {
1064         int devnum;
1065         dev_t base;
1066         struct ib_uverbs_device *uverbs_dev;
1067         int ret;
1068 
1069         if (!device->alloc_ucontext)
1070                 return;
1071 
1072         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1073         if (!uverbs_dev)
1074                 return;
1075 
1076         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1077         if (ret) {
1078                 kfree(uverbs_dev);
1079                 return;
1080         }
1081 
1082         atomic_set(&uverbs_dev->refcount, 1);
1083         init_completion(&uverbs_dev->comp);
1084         uverbs_dev->xrcd_tree = RB_ROOT;
1085         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1086         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1087         mutex_init(&uverbs_dev->lists_mutex);
1088         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1089         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1090 
1091         spin_lock(&map_lock);
1092         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1093         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1094                 spin_unlock(&map_lock);
1095                 devnum = find_overflow_devnum();
1096                 if (devnum < 0)
1097                         goto err;
1098 
1099                 spin_lock(&map_lock);
1100                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1101                 base = devnum + overflow_maj;
1102                 set_bit(devnum, overflow_map);
1103         } else {
1104                 uverbs_dev->devnum = devnum;
1105                 base = devnum + IB_UVERBS_BASE_DEV;
1106                 set_bit(devnum, dev_map);
1107         }
1108         spin_unlock(&map_lock);
1109 
1110         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1111         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1112 
1113         cdev_init(&uverbs_dev->cdev, NULL);
1114         uverbs_dev->cdev.owner = THIS_MODULE;
1115         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1116         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1117         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1118         if (cdev_add(&uverbs_dev->cdev, base, 1))
1119                 goto err_cdev;
1120 
1121         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1122                                         uverbs_dev->cdev.dev, uverbs_dev,
1123                                         "uverbs%d", uverbs_dev->devnum);
1124         if (IS_ERR(uverbs_dev->dev))
1125                 goto err_cdev;
1126 
1127         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1128                 goto err_class;
1129         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1130                 goto err_class;
1131 
1132         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1133 
1134         return;
1135 
1136 err_class:
1137         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1138 
1139 err_cdev:
1140         cdev_del(&uverbs_dev->cdev);
1141         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1142                 clear_bit(devnum, dev_map);
1143         else
1144                 clear_bit(devnum, overflow_map);
1145 
1146 err:
1147         if (atomic_dec_and_test(&uverbs_dev->refcount))
1148                 ib_uverbs_comp_dev(uverbs_dev);
1149         wait_for_completion(&uverbs_dev->comp);
1150         kobject_put(&uverbs_dev->kobj);
1151         return;
1152 }
1153 
1154 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1155                                         struct ib_device *ib_dev)
1156 {
1157         struct ib_uverbs_file *file;
1158         struct ib_uverbs_event_file *event_file;
1159         struct ib_event event;
1160 
1161         /* Pending running commands to terminate */
1162         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1163         event.event = IB_EVENT_DEVICE_FATAL;
1164         event.element.port_num = 0;
1165         event.device = ib_dev;
1166 
1167         mutex_lock(&uverbs_dev->lists_mutex);
1168         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1169                 struct ib_ucontext *ucontext;
1170 
1171                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1172                                         struct ib_uverbs_file, list);
1173                 file->is_closed = 1;
1174                 ucontext = file->ucontext;
1175                 list_del(&file->list);
1176                 file->ucontext = NULL;
1177                 kref_get(&file->ref);
1178                 mutex_unlock(&uverbs_dev->lists_mutex);
1179                 /* We must release the mutex before going ahead and calling
1180                  * disassociate_ucontext. disassociate_ucontext might end up
1181                  * indirectly calling uverbs_close, for example due to freeing
1182                  * the resources (e.g mmput).
1183                  */
1184                 ib_uverbs_event_handler(&file->event_handler, &event);
1185                 if (ucontext) {
1186                         ib_dev->disassociate_ucontext(ucontext);
1187                         ib_uverbs_cleanup_ucontext(file, ucontext);
1188                 }
1189 
1190                 mutex_lock(&uverbs_dev->lists_mutex);
1191                 kref_put(&file->ref, ib_uverbs_release_file);
1192         }
1193 
1194         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1195                 event_file = list_first_entry(&uverbs_dev->
1196                                               uverbs_events_file_list,
1197                                               struct ib_uverbs_event_file,
1198                                               list);
1199                 spin_lock_irq(&event_file->lock);
1200                 event_file->is_closed = 1;
1201                 spin_unlock_irq(&event_file->lock);
1202 
1203                 list_del(&event_file->list);
1204                 if (event_file->is_async) {
1205                         ib_unregister_event_handler(&event_file->uverbs_file->
1206                                                     event_handler);
1207                         event_file->uverbs_file->event_handler.device = NULL;
1208                 }
1209 
1210                 wake_up_interruptible(&event_file->poll_wait);
1211                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1212         }
1213         mutex_unlock(&uverbs_dev->lists_mutex);
1214 }
1215 
1216 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1217 {
1218         struct ib_uverbs_device *uverbs_dev = client_data;
1219         int wait_clients = 1;
1220 
1221         if (!uverbs_dev)
1222                 return;
1223 
1224         dev_set_drvdata(uverbs_dev->dev, NULL);
1225         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1226         cdev_del(&uverbs_dev->cdev);
1227 
1228         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1229                 clear_bit(uverbs_dev->devnum, dev_map);
1230         else
1231                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1232 
1233         if (device->disassociate_ucontext) {
1234                 /* We disassociate HW resources and immediately return.
1235                  * Userspace will see a EIO errno for all future access.
1236                  * Upon returning, ib_device may be freed internally and is not
1237                  * valid any more.
1238                  * uverbs_device is still available until all clients close
1239                  * their files, then the uverbs device ref count will be zero
1240                  * and its resources will be freed.
1241                  * Note: At this point no more files can be opened since the
1242                  * cdev was deleted, however active clients can still issue
1243                  * commands and close their open files.
1244                  */
1245                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1246                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1247                 wait_clients = 0;
1248         }
1249 
1250         if (atomic_dec_and_test(&uverbs_dev->refcount))
1251                 ib_uverbs_comp_dev(uverbs_dev);
1252         if (wait_clients)
1253                 wait_for_completion(&uverbs_dev->comp);
1254         kobject_put(&uverbs_dev->kobj);
1255 }
1256 
1257 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1258 {
1259         if (mode)
1260                 *mode = 0666;
1261         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1262 }
1263 
1264 static int __init ib_uverbs_init(void)
1265 {
1266         int ret;
1267 
1268         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1269                                      "infiniband_verbs");
1270         if (ret) {
1271                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1272                 goto out;
1273         }
1274 
1275         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1276         if (IS_ERR(uverbs_class)) {
1277                 ret = PTR_ERR(uverbs_class);
1278                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1279                 goto out_chrdev;
1280         }
1281 
1282         uverbs_class->devnode = uverbs_devnode;
1283 
1284         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1285         if (ret) {
1286                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1287                 goto out_class;
1288         }
1289 
1290         ret = ib_register_client(&uverbs_client);
1291         if (ret) {
1292                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1293                 goto out_class;
1294         }
1295 
1296         return 0;
1297 
1298 out_class:
1299         class_destroy(uverbs_class);
1300 
1301 out_chrdev:
1302         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1303 
1304 out:
1305         return ret;
1306 }
1307 
1308 static void __exit ib_uverbs_cleanup(void)
1309 {
1310         ib_unregister_client(&uverbs_client);
1311         class_destroy(uverbs_class);
1312         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1313         if (overflow_maj)
1314                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1315         idr_destroy(&ib_uverbs_pd_idr);
1316         idr_destroy(&ib_uverbs_mr_idr);
1317         idr_destroy(&ib_uverbs_mw_idr);
1318         idr_destroy(&ib_uverbs_ah_idr);
1319         idr_destroy(&ib_uverbs_cq_idr);
1320         idr_destroy(&ib_uverbs_qp_idr);
1321         idr_destroy(&ib_uverbs_srq_idr);
1322 }
1323 
1324 module_init(ib_uverbs_init);
1325 module_exit(ib_uverbs_cleanup);
1326 

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