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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 <linux/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 DEFINE_IDR(ib_uverbs_wq_idr);
 80 DEFINE_IDR(ib_uverbs_rwq_ind_tbl_idr);
 81 
 82 static DEFINE_SPINLOCK(map_lock);
 83 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
 84 
 85 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
 86                                      struct ib_device *ib_dev,
 87                                      const char __user *buf, int in_len,
 88                                      int out_len) = {
 89         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
 90         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
 91         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
 92         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
 93         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
 94         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
 95         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
 96         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
 97         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
 98         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
 99         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
100         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
101         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
102         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
103         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
104         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
105         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
106         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
107         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
108         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
109         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
110         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
111         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
112         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
113         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
114         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
115         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
116         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
117         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
118         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
119         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
120         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
121         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
122         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
123         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
124 };
125 
126 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
127                                     struct ib_device *ib_dev,
128                                     struct ib_udata *ucore,
129                                     struct ib_udata *uhw) = {
130         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
131         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
132         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
133         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
134         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
135         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
136         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
137         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
138         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
139         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
140         [IB_USER_VERBS_EX_CMD_MODIFY_QP]        = ib_uverbs_ex_modify_qp,
141 };
142 
143 static void ib_uverbs_add_one(struct ib_device *device);
144 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
145 
146 int uverbs_dealloc_mw(struct ib_mw *mw)
147 {
148         struct ib_pd *pd = mw->pd;
149         int ret;
150 
151         ret = mw->device->dealloc_mw(mw);
152         if (!ret)
153                 atomic_dec(&pd->usecnt);
154         return ret;
155 }
156 
157 static void ib_uverbs_release_dev(struct kobject *kobj)
158 {
159         struct ib_uverbs_device *dev =
160                 container_of(kobj, struct ib_uverbs_device, kobj);
161 
162         cleanup_srcu_struct(&dev->disassociate_srcu);
163         kfree(dev);
164 }
165 
166 static struct kobj_type ib_uverbs_dev_ktype = {
167         .release = ib_uverbs_release_dev,
168 };
169 
170 static void ib_uverbs_release_event_file(struct kref *ref)
171 {
172         struct ib_uverbs_event_file *file =
173                 container_of(ref, struct ib_uverbs_event_file, ref);
174 
175         kfree(file);
176 }
177 
178 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
179                           struct ib_uverbs_event_file *ev_file,
180                           struct ib_ucq_object *uobj)
181 {
182         struct ib_uverbs_event *evt, *tmp;
183 
184         if (ev_file) {
185                 spin_lock_irq(&ev_file->lock);
186                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
187                         list_del(&evt->list);
188                         kfree(evt);
189                 }
190                 spin_unlock_irq(&ev_file->lock);
191 
192                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
193         }
194 
195         spin_lock_irq(&file->async_file->lock);
196         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
197                 list_del(&evt->list);
198                 kfree(evt);
199         }
200         spin_unlock_irq(&file->async_file->lock);
201 }
202 
203 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
204                               struct ib_uevent_object *uobj)
205 {
206         struct ib_uverbs_event *evt, *tmp;
207 
208         spin_lock_irq(&file->async_file->lock);
209         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
210                 list_del(&evt->list);
211                 kfree(evt);
212         }
213         spin_unlock_irq(&file->async_file->lock);
214 }
215 
216 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
217                                     struct ib_uqp_object *uobj)
218 {
219         struct ib_uverbs_mcast_entry *mcast, *tmp;
220 
221         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
222                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
223                 list_del(&mcast->list);
224                 kfree(mcast);
225         }
226 }
227 
228 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
229                                       struct ib_ucontext *context)
230 {
231         struct ib_uobject *uobj, *tmp;
232 
233         context->closing = 1;
234 
235         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
236                 struct ib_ah *ah = uobj->object;
237 
238                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
239                 ib_destroy_ah(ah);
240                 kfree(uobj);
241         }
242 
243         /* Remove MWs before QPs, in order to support type 2A MWs. */
244         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
245                 struct ib_mw *mw = uobj->object;
246 
247                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
248                 uverbs_dealloc_mw(mw);
249                 kfree(uobj);
250         }
251 
252         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
253                 struct ib_flow *flow_id = uobj->object;
254 
255                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
256                 ib_destroy_flow(flow_id);
257                 kfree(uobj);
258         }
259 
260         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
261                 struct ib_qp *qp = uobj->object;
262                 struct ib_uqp_object *uqp =
263                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
264 
265                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
266                 if (qp == qp->real_qp)
267                         ib_uverbs_detach_umcast(qp, uqp);
268                 ib_destroy_qp(qp);
269                 ib_uverbs_release_uevent(file, &uqp->uevent);
270                 kfree(uqp);
271         }
272 
273         list_for_each_entry_safe(uobj, tmp, &context->rwq_ind_tbl_list, list) {
274                 struct ib_rwq_ind_table *rwq_ind_tbl = uobj->object;
275                 struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl;
276 
277                 idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
278                 ib_destroy_rwq_ind_table(rwq_ind_tbl);
279                 kfree(ind_tbl);
280                 kfree(uobj);
281         }
282 
283         list_for_each_entry_safe(uobj, tmp, &context->wq_list, list) {
284                 struct ib_wq *wq = uobj->object;
285                 struct ib_uwq_object *uwq =
286                         container_of(uobj, struct ib_uwq_object, uevent.uobject);
287 
288                 idr_remove_uobj(&ib_uverbs_wq_idr, uobj);
289                 ib_destroy_wq(wq);
290                 ib_uverbs_release_uevent(file, &uwq->uevent);
291                 kfree(uwq);
292         }
293 
294         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
295                 struct ib_srq *srq = uobj->object;
296                 struct ib_uevent_object *uevent =
297                         container_of(uobj, struct ib_uevent_object, uobject);
298 
299                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
300                 ib_destroy_srq(srq);
301                 ib_uverbs_release_uevent(file, uevent);
302                 kfree(uevent);
303         }
304 
305         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
306                 struct ib_cq *cq = uobj->object;
307                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
308                 struct ib_ucq_object *ucq =
309                         container_of(uobj, struct ib_ucq_object, uobject);
310 
311                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
312                 ib_destroy_cq(cq);
313                 ib_uverbs_release_ucq(file, ev_file, ucq);
314                 kfree(ucq);
315         }
316 
317         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
318                 struct ib_mr *mr = uobj->object;
319 
320                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
321                 ib_dereg_mr(mr);
322                 kfree(uobj);
323         }
324 
325         mutex_lock(&file->device->xrcd_tree_mutex);
326         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
327                 struct ib_xrcd *xrcd = uobj->object;
328                 struct ib_uxrcd_object *uxrcd =
329                         container_of(uobj, struct ib_uxrcd_object, uobject);
330 
331                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
332                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
333                 kfree(uxrcd);
334         }
335         mutex_unlock(&file->device->xrcd_tree_mutex);
336 
337         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
338                 struct ib_pd *pd = uobj->object;
339 
340                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
341                 ib_dealloc_pd(pd);
342                 kfree(uobj);
343         }
344 
345         put_pid(context->tgid);
346 
347         return context->device->dealloc_ucontext(context);
348 }
349 
350 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
351 {
352         complete(&dev->comp);
353 }
354 
355 static void ib_uverbs_release_file(struct kref *ref)
356 {
357         struct ib_uverbs_file *file =
358                 container_of(ref, struct ib_uverbs_file, ref);
359         struct ib_device *ib_dev;
360         int srcu_key;
361 
362         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
363         ib_dev = srcu_dereference(file->device->ib_dev,
364                                   &file->device->disassociate_srcu);
365         if (ib_dev && !ib_dev->disassociate_ucontext)
366                 module_put(ib_dev->owner);
367         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
368 
369         if (atomic_dec_and_test(&file->device->refcount))
370                 ib_uverbs_comp_dev(file->device);
371 
372         kfree(file);
373 }
374 
375 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
376                                     size_t count, loff_t *pos)
377 {
378         struct ib_uverbs_event_file *file = filp->private_data;
379         struct ib_uverbs_event *event;
380         int eventsz;
381         int ret = 0;
382 
383         spin_lock_irq(&file->lock);
384 
385         while (list_empty(&file->event_list)) {
386                 spin_unlock_irq(&file->lock);
387 
388                 if (filp->f_flags & O_NONBLOCK)
389                         return -EAGAIN;
390 
391                 if (wait_event_interruptible(file->poll_wait,
392                                              (!list_empty(&file->event_list) ||
393                         /* The barriers built into wait_event_interruptible()
394                          * and wake_up() guarentee this will see the null set
395                          * without using RCU
396                          */
397                                              !file->uverbs_file->device->ib_dev)))
398                         return -ERESTARTSYS;
399 
400                 /* If device was disassociated and no event exists set an error */
401                 if (list_empty(&file->event_list) &&
402                     !file->uverbs_file->device->ib_dev)
403                         return -EIO;
404 
405                 spin_lock_irq(&file->lock);
406         }
407 
408         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
409 
410         if (file->is_async)
411                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
412         else
413                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
414 
415         if (eventsz > count) {
416                 ret   = -EINVAL;
417                 event = NULL;
418         } else {
419                 list_del(file->event_list.next);
420                 if (event->counter) {
421                         ++(*event->counter);
422                         list_del(&event->obj_list);
423                 }
424         }
425 
426         spin_unlock_irq(&file->lock);
427 
428         if (event) {
429                 if (copy_to_user(buf, event, eventsz))
430                         ret = -EFAULT;
431                 else
432                         ret = eventsz;
433         }
434 
435         kfree(event);
436 
437         return ret;
438 }
439 
440 static unsigned int ib_uverbs_event_poll(struct file *filp,
441                                          struct poll_table_struct *wait)
442 {
443         unsigned int pollflags = 0;
444         struct ib_uverbs_event_file *file = filp->private_data;
445 
446         poll_wait(filp, &file->poll_wait, wait);
447 
448         spin_lock_irq(&file->lock);
449         if (!list_empty(&file->event_list))
450                 pollflags = POLLIN | POLLRDNORM;
451         spin_unlock_irq(&file->lock);
452 
453         return pollflags;
454 }
455 
456 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
457 {
458         struct ib_uverbs_event_file *file = filp->private_data;
459 
460         return fasync_helper(fd, filp, on, &file->async_queue);
461 }
462 
463 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
464 {
465         struct ib_uverbs_event_file *file = filp->private_data;
466         struct ib_uverbs_event *entry, *tmp;
467         int closed_already = 0;
468 
469         mutex_lock(&file->uverbs_file->device->lists_mutex);
470         spin_lock_irq(&file->lock);
471         closed_already = file->is_closed;
472         file->is_closed = 1;
473         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
474                 if (entry->counter)
475                         list_del(&entry->obj_list);
476                 kfree(entry);
477         }
478         spin_unlock_irq(&file->lock);
479         if (!closed_already) {
480                 list_del(&file->list);
481                 if (file->is_async)
482                         ib_unregister_event_handler(&file->uverbs_file->
483                                 event_handler);
484         }
485         mutex_unlock(&file->uverbs_file->device->lists_mutex);
486 
487         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
488         kref_put(&file->ref, ib_uverbs_release_event_file);
489 
490         return 0;
491 }
492 
493 static const struct file_operations uverbs_event_fops = {
494         .owner   = THIS_MODULE,
495         .read    = ib_uverbs_event_read,
496         .poll    = ib_uverbs_event_poll,
497         .release = ib_uverbs_event_close,
498         .fasync  = ib_uverbs_event_fasync,
499         .llseek  = no_llseek,
500 };
501 
502 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
503 {
504         struct ib_uverbs_event_file    *file = cq_context;
505         struct ib_ucq_object           *uobj;
506         struct ib_uverbs_event         *entry;
507         unsigned long                   flags;
508 
509         if (!file)
510                 return;
511 
512         spin_lock_irqsave(&file->lock, flags);
513         if (file->is_closed) {
514                 spin_unlock_irqrestore(&file->lock, flags);
515                 return;
516         }
517 
518         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
519         if (!entry) {
520                 spin_unlock_irqrestore(&file->lock, flags);
521                 return;
522         }
523 
524         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
525 
526         entry->desc.comp.cq_handle = cq->uobject->user_handle;
527         entry->counter             = &uobj->comp_events_reported;
528 
529         list_add_tail(&entry->list, &file->event_list);
530         list_add_tail(&entry->obj_list, &uobj->comp_list);
531         spin_unlock_irqrestore(&file->lock, flags);
532 
533         wake_up_interruptible(&file->poll_wait);
534         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
535 }
536 
537 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
538                                     __u64 element, __u64 event,
539                                     struct list_head *obj_list,
540                                     u32 *counter)
541 {
542         struct ib_uverbs_event *entry;
543         unsigned long flags;
544 
545         spin_lock_irqsave(&file->async_file->lock, flags);
546         if (file->async_file->is_closed) {
547                 spin_unlock_irqrestore(&file->async_file->lock, flags);
548                 return;
549         }
550 
551         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
552         if (!entry) {
553                 spin_unlock_irqrestore(&file->async_file->lock, flags);
554                 return;
555         }
556 
557         entry->desc.async.element    = element;
558         entry->desc.async.event_type = event;
559         entry->desc.async.reserved   = 0;
560         entry->counter               = counter;
561 
562         list_add_tail(&entry->list, &file->async_file->event_list);
563         if (obj_list)
564                 list_add_tail(&entry->obj_list, obj_list);
565         spin_unlock_irqrestore(&file->async_file->lock, flags);
566 
567         wake_up_interruptible(&file->async_file->poll_wait);
568         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
569 }
570 
571 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
572 {
573         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
574                                                   struct ib_ucq_object, uobject);
575 
576         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
577                                 event->event, &uobj->async_list,
578                                 &uobj->async_events_reported);
579 }
580 
581 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
582 {
583         struct ib_uevent_object *uobj;
584 
585         /* for XRC target qp's, check that qp is live */
586         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
587                 return;
588 
589         uobj = container_of(event->element.qp->uobject,
590                             struct ib_uevent_object, uobject);
591 
592         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
593                                 event->event, &uobj->event_list,
594                                 &uobj->events_reported);
595 }
596 
597 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
598 {
599         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
600                                                   struct ib_uevent_object, uobject);
601 
602         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
603                                 event->event, &uobj->event_list,
604                                 &uobj->events_reported);
605 }
606 
607 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
608 {
609         struct ib_uevent_object *uobj;
610 
611         uobj = container_of(event->element.srq->uobject,
612                             struct ib_uevent_object, uobject);
613 
614         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
615                                 event->event, &uobj->event_list,
616                                 &uobj->events_reported);
617 }
618 
619 void ib_uverbs_event_handler(struct ib_event_handler *handler,
620                              struct ib_event *event)
621 {
622         struct ib_uverbs_file *file =
623                 container_of(handler, struct ib_uverbs_file, event_handler);
624 
625         ib_uverbs_async_handler(file, event->element.port_num, event->event,
626                                 NULL, NULL);
627 }
628 
629 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
630 {
631         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
632         file->async_file = NULL;
633 }
634 
635 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
636                                         struct ib_device        *ib_dev,
637                                         int is_async)
638 {
639         struct ib_uverbs_event_file *ev_file;
640         struct file *filp;
641         int ret;
642 
643         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
644         if (!ev_file)
645                 return ERR_PTR(-ENOMEM);
646 
647         kref_init(&ev_file->ref);
648         spin_lock_init(&ev_file->lock);
649         INIT_LIST_HEAD(&ev_file->event_list);
650         init_waitqueue_head(&ev_file->poll_wait);
651         ev_file->uverbs_file = uverbs_file;
652         kref_get(&ev_file->uverbs_file->ref);
653         ev_file->async_queue = NULL;
654         ev_file->is_closed   = 0;
655 
656         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
657                                   ev_file, O_RDONLY);
658         if (IS_ERR(filp))
659                 goto err_put_refs;
660 
661         mutex_lock(&uverbs_file->device->lists_mutex);
662         list_add_tail(&ev_file->list,
663                       &uverbs_file->device->uverbs_events_file_list);
664         mutex_unlock(&uverbs_file->device->lists_mutex);
665 
666         if (is_async) {
667                 WARN_ON(uverbs_file->async_file);
668                 uverbs_file->async_file = ev_file;
669                 kref_get(&uverbs_file->async_file->ref);
670                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
671                                       ib_dev,
672                                       ib_uverbs_event_handler);
673                 ret = ib_register_event_handler(&uverbs_file->event_handler);
674                 if (ret)
675                         goto err_put_file;
676 
677                 /* At that point async file stuff was fully set */
678                 ev_file->is_async = 1;
679         }
680 
681         return filp;
682 
683 err_put_file:
684         fput(filp);
685         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
686         uverbs_file->async_file = NULL;
687         return ERR_PTR(ret);
688 
689 err_put_refs:
690         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
691         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
692         return filp;
693 }
694 
695 /*
696  * Look up a completion event file by FD.  If lookup is successful,
697  * takes a ref to the event file struct that it returns; if
698  * unsuccessful, returns NULL.
699  */
700 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
701 {
702         struct ib_uverbs_event_file *ev_file = NULL;
703         struct fd f = fdget(fd);
704 
705         if (!f.file)
706                 return NULL;
707 
708         if (f.file->f_op != &uverbs_event_fops)
709                 goto out;
710 
711         ev_file = f.file->private_data;
712         if (ev_file->is_async) {
713                 ev_file = NULL;
714                 goto out;
715         }
716 
717         kref_get(&ev_file->ref);
718 
719 out:
720         fdput(f);
721         return ev_file;
722 }
723 
724 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
725 {
726         u64 mask;
727 
728         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
729                 mask = ib_dev->uverbs_cmd_mask;
730         else
731                 mask = ib_dev->uverbs_ex_cmd_mask;
732 
733         if (mask & ((u64)1 << command))
734                 return 0;
735 
736         return -1;
737 }
738 
739 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
740                              size_t count, loff_t *pos)
741 {
742         struct ib_uverbs_file *file = filp->private_data;
743         struct ib_device *ib_dev;
744         struct ib_uverbs_cmd_hdr hdr;
745         __u32 command;
746         __u32 flags;
747         int srcu_key;
748         ssize_t ret;
749 
750         if (!ib_safe_file_access(filp)) {
751                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
752                             task_tgid_vnr(current), current->comm);
753                 return -EACCES;
754         }
755 
756         if (count < sizeof hdr)
757                 return -EINVAL;
758 
759         if (copy_from_user(&hdr, buf, sizeof hdr))
760                 return -EFAULT;
761 
762         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
763         ib_dev = srcu_dereference(file->device->ib_dev,
764                                   &file->device->disassociate_srcu);
765         if (!ib_dev) {
766                 ret = -EIO;
767                 goto out;
768         }
769 
770         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
771                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
772                 ret = -EINVAL;
773                 goto out;
774         }
775 
776         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
777         if (verify_command_mask(ib_dev, command)) {
778                 ret = -EOPNOTSUPP;
779                 goto out;
780         }
781 
782         if (!file->ucontext &&
783             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
784                 ret = -EINVAL;
785                 goto out;
786         }
787 
788         flags = (hdr.command &
789                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
790 
791         if (!flags) {
792                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
793                     !uverbs_cmd_table[command]) {
794                         ret = -EINVAL;
795                         goto out;
796                 }
797 
798                 if (hdr.in_words * 4 != count) {
799                         ret = -EINVAL;
800                         goto out;
801                 }
802 
803                 ret = uverbs_cmd_table[command](file, ib_dev,
804                                                  buf + sizeof(hdr),
805                                                  hdr.in_words * 4,
806                                                  hdr.out_words * 4);
807 
808         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
809                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
810                 struct ib_udata ucore;
811                 struct ib_udata uhw;
812                 size_t written_count = count;
813 
814                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
815                     !uverbs_ex_cmd_table[command]) {
816                         ret = -ENOSYS;
817                         goto out;
818                 }
819 
820                 if (!file->ucontext) {
821                         ret = -EINVAL;
822                         goto out;
823                 }
824 
825                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
826                         ret = -EINVAL;
827                         goto out;
828                 }
829 
830                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
831                         ret = -EFAULT;
832                         goto out;
833                 }
834 
835                 count -= sizeof(hdr) + sizeof(ex_hdr);
836                 buf += sizeof(hdr) + sizeof(ex_hdr);
837 
838                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
839                         ret = -EINVAL;
840                         goto out;
841                 }
842 
843                 if (ex_hdr.cmd_hdr_reserved) {
844                         ret = -EINVAL;
845                         goto out;
846                 }
847 
848                 if (ex_hdr.response) {
849                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
850                                 ret = -EINVAL;
851                                 goto out;
852                         }
853 
854                         if (!access_ok(VERIFY_WRITE,
855                                        (void __user *) (unsigned long) ex_hdr.response,
856                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
857                                 ret = -EFAULT;
858                                 goto out;
859                         }
860                 } else {
861                         if (hdr.out_words || ex_hdr.provider_out_words) {
862                                 ret = -EINVAL;
863                                 goto out;
864                         }
865                 }
866 
867                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
868                                        hdr.in_words * 8, hdr.out_words * 8);
869 
870                 INIT_UDATA_BUF_OR_NULL(&uhw,
871                                        buf + ucore.inlen,
872                                        (unsigned long) ex_hdr.response + ucore.outlen,
873                                        ex_hdr.provider_in_words * 8,
874                                        ex_hdr.provider_out_words * 8);
875 
876                 ret = uverbs_ex_cmd_table[command](file,
877                                                    ib_dev,
878                                                    &ucore,
879                                                    &uhw);
880                 if (!ret)
881                         ret = written_count;
882         } else {
883                 ret = -ENOSYS;
884         }
885 
886 out:
887         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
888         return ret;
889 }
890 
891 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
892 {
893         struct ib_uverbs_file *file = filp->private_data;
894         struct ib_device *ib_dev;
895         int ret = 0;
896         int srcu_key;
897 
898         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
899         ib_dev = srcu_dereference(file->device->ib_dev,
900                                   &file->device->disassociate_srcu);
901         if (!ib_dev) {
902                 ret = -EIO;
903                 goto out;
904         }
905 
906         if (!file->ucontext)
907                 ret = -ENODEV;
908         else
909                 ret = ib_dev->mmap(file->ucontext, vma);
910 out:
911         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
912         return ret;
913 }
914 
915 /*
916  * ib_uverbs_open() does not need the BKL:
917  *
918  *  - the ib_uverbs_device structures are properly reference counted and
919  *    everything else is purely local to the file being created, so
920  *    races against other open calls are not a problem;
921  *  - there is no ioctl method to race against;
922  *  - the open method will either immediately run -ENXIO, or all
923  *    required initialization will be done.
924  */
925 static int ib_uverbs_open(struct inode *inode, struct file *filp)
926 {
927         struct ib_uverbs_device *dev;
928         struct ib_uverbs_file *file;
929         struct ib_device *ib_dev;
930         int ret;
931         int module_dependent;
932         int srcu_key;
933 
934         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
935         if (!atomic_inc_not_zero(&dev->refcount))
936                 return -ENXIO;
937 
938         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
939         mutex_lock(&dev->lists_mutex);
940         ib_dev = srcu_dereference(dev->ib_dev,
941                                   &dev->disassociate_srcu);
942         if (!ib_dev) {
943                 ret = -EIO;
944                 goto err;
945         }
946 
947         /* In case IB device supports disassociate ucontext, there is no hard
948          * dependency between uverbs device and its low level device.
949          */
950         module_dependent = !(ib_dev->disassociate_ucontext);
951 
952         if (module_dependent) {
953                 if (!try_module_get(ib_dev->owner)) {
954                         ret = -ENODEV;
955                         goto err;
956                 }
957         }
958 
959         file = kzalloc(sizeof(*file), GFP_KERNEL);
960         if (!file) {
961                 ret = -ENOMEM;
962                 if (module_dependent)
963                         goto err_module;
964 
965                 goto err;
966         }
967 
968         file->device     = dev;
969         file->ucontext   = NULL;
970         file->async_file = NULL;
971         kref_init(&file->ref);
972         mutex_init(&file->mutex);
973         mutex_init(&file->cleanup_mutex);
974 
975         filp->private_data = file;
976         kobject_get(&dev->kobj);
977         list_add_tail(&file->list, &dev->uverbs_file_list);
978         mutex_unlock(&dev->lists_mutex);
979         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
980 
981         return nonseekable_open(inode, filp);
982 
983 err_module:
984         module_put(ib_dev->owner);
985 
986 err:
987         mutex_unlock(&dev->lists_mutex);
988         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
989         if (atomic_dec_and_test(&dev->refcount))
990                 ib_uverbs_comp_dev(dev);
991 
992         return ret;
993 }
994 
995 static int ib_uverbs_close(struct inode *inode, struct file *filp)
996 {
997         struct ib_uverbs_file *file = filp->private_data;
998         struct ib_uverbs_device *dev = file->device;
999 
1000         mutex_lock(&file->cleanup_mutex);
1001         if (file->ucontext) {
1002                 ib_uverbs_cleanup_ucontext(file, file->ucontext);
1003                 file->ucontext = NULL;
1004         }
1005         mutex_unlock(&file->cleanup_mutex);
1006 
1007         mutex_lock(&file->device->lists_mutex);
1008         if (!file->is_closed) {
1009                 list_del(&file->list);
1010                 file->is_closed = 1;
1011         }
1012         mutex_unlock(&file->device->lists_mutex);
1013 
1014         if (file->async_file)
1015                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
1016 
1017         kref_put(&file->ref, ib_uverbs_release_file);
1018         kobject_put(&dev->kobj);
1019 
1020         return 0;
1021 }
1022 
1023 static const struct file_operations uverbs_fops = {
1024         .owner   = THIS_MODULE,
1025         .write   = ib_uverbs_write,
1026         .open    = ib_uverbs_open,
1027         .release = ib_uverbs_close,
1028         .llseek  = no_llseek,
1029 };
1030 
1031 static const struct file_operations uverbs_mmap_fops = {
1032         .owner   = THIS_MODULE,
1033         .write   = ib_uverbs_write,
1034         .mmap    = ib_uverbs_mmap,
1035         .open    = ib_uverbs_open,
1036         .release = ib_uverbs_close,
1037         .llseek  = no_llseek,
1038 };
1039 
1040 static struct ib_client uverbs_client = {
1041         .name   = "uverbs",
1042         .add    = ib_uverbs_add_one,
1043         .remove = ib_uverbs_remove_one
1044 };
1045 
1046 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1047                           char *buf)
1048 {
1049         int ret = -ENODEV;
1050         int srcu_key;
1051         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1052         struct ib_device *ib_dev;
1053 
1054         if (!dev)
1055                 return -ENODEV;
1056 
1057         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1058         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1059         if (ib_dev)
1060                 ret = sprintf(buf, "%s\n", ib_dev->name);
1061         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1062 
1063         return ret;
1064 }
1065 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1066 
1067 static ssize_t show_dev_abi_version(struct device *device,
1068                                     struct device_attribute *attr, char *buf)
1069 {
1070         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1071         int ret = -ENODEV;
1072         int srcu_key;
1073         struct ib_device *ib_dev;
1074 
1075         if (!dev)
1076                 return -ENODEV;
1077         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1078         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1079         if (ib_dev)
1080                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1081         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1082 
1083         return ret;
1084 }
1085 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1086 
1087 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1088                          __stringify(IB_USER_VERBS_ABI_VERSION));
1089 
1090 static dev_t overflow_maj;
1091 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1092 
1093 /*
1094  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1095  * requesting a new major number and doubling the number of max devices we
1096  * support. It's stupid, but simple.
1097  */
1098 static int find_overflow_devnum(void)
1099 {
1100         int ret;
1101 
1102         if (!overflow_maj) {
1103                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1104                                           "infiniband_verbs");
1105                 if (ret) {
1106                         pr_err("user_verbs: couldn't register dynamic device number\n");
1107                         return ret;
1108                 }
1109         }
1110 
1111         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1112         if (ret >= IB_UVERBS_MAX_DEVICES)
1113                 return -1;
1114 
1115         return ret;
1116 }
1117 
1118 static void ib_uverbs_add_one(struct ib_device *device)
1119 {
1120         int devnum;
1121         dev_t base;
1122         struct ib_uverbs_device *uverbs_dev;
1123         int ret;
1124 
1125         if (!device->alloc_ucontext)
1126                 return;
1127 
1128         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1129         if (!uverbs_dev)
1130                 return;
1131 
1132         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1133         if (ret) {
1134                 kfree(uverbs_dev);
1135                 return;
1136         }
1137 
1138         atomic_set(&uverbs_dev->refcount, 1);
1139         init_completion(&uverbs_dev->comp);
1140         uverbs_dev->xrcd_tree = RB_ROOT;
1141         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1142         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1143         mutex_init(&uverbs_dev->lists_mutex);
1144         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1145         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1146 
1147         spin_lock(&map_lock);
1148         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1149         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1150                 spin_unlock(&map_lock);
1151                 devnum = find_overflow_devnum();
1152                 if (devnum < 0)
1153                         goto err;
1154 
1155                 spin_lock(&map_lock);
1156                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1157                 base = devnum + overflow_maj;
1158                 set_bit(devnum, overflow_map);
1159         } else {
1160                 uverbs_dev->devnum = devnum;
1161                 base = devnum + IB_UVERBS_BASE_DEV;
1162                 set_bit(devnum, dev_map);
1163         }
1164         spin_unlock(&map_lock);
1165 
1166         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1167         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1168 
1169         cdev_init(&uverbs_dev->cdev, NULL);
1170         uverbs_dev->cdev.owner = THIS_MODULE;
1171         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1172         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1173         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1174         if (cdev_add(&uverbs_dev->cdev, base, 1))
1175                 goto err_cdev;
1176 
1177         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1178                                         uverbs_dev->cdev.dev, uverbs_dev,
1179                                         "uverbs%d", uverbs_dev->devnum);
1180         if (IS_ERR(uverbs_dev->dev))
1181                 goto err_cdev;
1182 
1183         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1184                 goto err_class;
1185         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1186                 goto err_class;
1187 
1188         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1189 
1190         return;
1191 
1192 err_class:
1193         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1194 
1195 err_cdev:
1196         cdev_del(&uverbs_dev->cdev);
1197         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1198                 clear_bit(devnum, dev_map);
1199         else
1200                 clear_bit(devnum, overflow_map);
1201 
1202 err:
1203         if (atomic_dec_and_test(&uverbs_dev->refcount))
1204                 ib_uverbs_comp_dev(uverbs_dev);
1205         wait_for_completion(&uverbs_dev->comp);
1206         kobject_put(&uverbs_dev->kobj);
1207         return;
1208 }
1209 
1210 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1211                                         struct ib_device *ib_dev)
1212 {
1213         struct ib_uverbs_file *file;
1214         struct ib_uverbs_event_file *event_file;
1215         struct ib_event event;
1216 
1217         /* Pending running commands to terminate */
1218         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1219         event.event = IB_EVENT_DEVICE_FATAL;
1220         event.element.port_num = 0;
1221         event.device = ib_dev;
1222 
1223         mutex_lock(&uverbs_dev->lists_mutex);
1224         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1225                 struct ib_ucontext *ucontext;
1226                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1227                                         struct ib_uverbs_file, list);
1228                 file->is_closed = 1;
1229                 list_del(&file->list);
1230                 kref_get(&file->ref);
1231                 mutex_unlock(&uverbs_dev->lists_mutex);
1232 
1233                 ib_uverbs_event_handler(&file->event_handler, &event);
1234 
1235                 mutex_lock(&file->cleanup_mutex);
1236                 ucontext = file->ucontext;
1237                 file->ucontext = NULL;
1238                 mutex_unlock(&file->cleanup_mutex);
1239 
1240                 /* At this point ib_uverbs_close cannot be running
1241                  * ib_uverbs_cleanup_ucontext
1242                  */
1243                 if (ucontext) {
1244                         /* We must release the mutex before going ahead and
1245                          * calling disassociate_ucontext. disassociate_ucontext
1246                          * might end up indirectly calling uverbs_close,
1247                          * for example due to freeing the resources
1248                          * (e.g mmput).
1249                          */
1250                         ib_dev->disassociate_ucontext(ucontext);
1251                         ib_uverbs_cleanup_ucontext(file, ucontext);
1252                 }
1253 
1254                 mutex_lock(&uverbs_dev->lists_mutex);
1255                 kref_put(&file->ref, ib_uverbs_release_file);
1256         }
1257 
1258         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1259                 event_file = list_first_entry(&uverbs_dev->
1260                                               uverbs_events_file_list,
1261                                               struct ib_uverbs_event_file,
1262                                               list);
1263                 spin_lock_irq(&event_file->lock);
1264                 event_file->is_closed = 1;
1265                 spin_unlock_irq(&event_file->lock);
1266 
1267                 list_del(&event_file->list);
1268                 if (event_file->is_async) {
1269                         ib_unregister_event_handler(&event_file->uverbs_file->
1270                                                     event_handler);
1271                         event_file->uverbs_file->event_handler.device = NULL;
1272                 }
1273 
1274                 wake_up_interruptible(&event_file->poll_wait);
1275                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1276         }
1277         mutex_unlock(&uverbs_dev->lists_mutex);
1278 }
1279 
1280 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1281 {
1282         struct ib_uverbs_device *uverbs_dev = client_data;
1283         int wait_clients = 1;
1284 
1285         if (!uverbs_dev)
1286                 return;
1287 
1288         dev_set_drvdata(uverbs_dev->dev, NULL);
1289         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1290         cdev_del(&uverbs_dev->cdev);
1291 
1292         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1293                 clear_bit(uverbs_dev->devnum, dev_map);
1294         else
1295                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1296 
1297         if (device->disassociate_ucontext) {
1298                 /* We disassociate HW resources and immediately return.
1299                  * Userspace will see a EIO errno for all future access.
1300                  * Upon returning, ib_device may be freed internally and is not
1301                  * valid any more.
1302                  * uverbs_device is still available until all clients close
1303                  * their files, then the uverbs device ref count will be zero
1304                  * and its resources will be freed.
1305                  * Note: At this point no more files can be opened since the
1306                  * cdev was deleted, however active clients can still issue
1307                  * commands and close their open files.
1308                  */
1309                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1310                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1311                 wait_clients = 0;
1312         }
1313 
1314         if (atomic_dec_and_test(&uverbs_dev->refcount))
1315                 ib_uverbs_comp_dev(uverbs_dev);
1316         if (wait_clients)
1317                 wait_for_completion(&uverbs_dev->comp);
1318         kobject_put(&uverbs_dev->kobj);
1319 }
1320 
1321 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1322 {
1323         if (mode)
1324                 *mode = 0666;
1325         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1326 }
1327 
1328 static int __init ib_uverbs_init(void)
1329 {
1330         int ret;
1331 
1332         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1333                                      "infiniband_verbs");
1334         if (ret) {
1335                 pr_err("user_verbs: couldn't register device number\n");
1336                 goto out;
1337         }
1338 
1339         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1340         if (IS_ERR(uverbs_class)) {
1341                 ret = PTR_ERR(uverbs_class);
1342                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1343                 goto out_chrdev;
1344         }
1345 
1346         uverbs_class->devnode = uverbs_devnode;
1347 
1348         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1349         if (ret) {
1350                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1351                 goto out_class;
1352         }
1353 
1354         ret = ib_register_client(&uverbs_client);
1355         if (ret) {
1356                 pr_err("user_verbs: couldn't register client\n");
1357                 goto out_class;
1358         }
1359 
1360         return 0;
1361 
1362 out_class:
1363         class_destroy(uverbs_class);
1364 
1365 out_chrdev:
1366         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1367 
1368 out:
1369         return ret;
1370 }
1371 
1372 static void __exit ib_uverbs_cleanup(void)
1373 {
1374         ib_unregister_client(&uverbs_client);
1375         class_destroy(uverbs_class);
1376         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1377         if (overflow_maj)
1378                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1379         idr_destroy(&ib_uverbs_pd_idr);
1380         idr_destroy(&ib_uverbs_mr_idr);
1381         idr_destroy(&ib_uverbs_mw_idr);
1382         idr_destroy(&ib_uverbs_ah_idr);
1383         idr_destroy(&ib_uverbs_cq_idr);
1384         idr_destroy(&ib_uverbs_qp_idr);
1385         idr_destroy(&ib_uverbs_srq_idr);
1386 }
1387 
1388 module_init(ib_uverbs_init);
1389 module_exit(ib_uverbs_cleanup);
1390 

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