Version:  2.0.40 2.2.26 2.4.37 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1 4.2 4.3 4.4 4.5 4.6 4.7 4.8 4.9

Linux/drivers/infiniband/core/uverbs_main.c

  1 /*
  2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
  3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
  6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
  7  *
  8  * This software is available to you under a choice of one of two
  9  * licenses.  You may choose to be licensed under the terms of the GNU
 10  * General Public License (GPL) Version 2, available from the file
 11  * COPYING in the main directory of this source tree, or the
 12  * OpenIB.org BSD license below:
 13  *
 14  *     Redistribution and use in source and binary forms, with or
 15  *     without modification, are permitted provided that the following
 16  *     conditions are met:
 17  *
 18  *      - Redistributions of source code must retain the above
 19  *        copyright notice, this list of conditions and the following
 20  *        disclaimer.
 21  *
 22  *      - Redistributions in binary form must reproduce the above
 23  *        copyright notice, this list of conditions and the following
 24  *        disclaimer in the documentation and/or other materials
 25  *        provided with the distribution.
 26  *
 27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 34  * SOFTWARE.
 35  */
 36 
 37 #include <linux/module.h>
 38 #include <linux/init.h>
 39 #include <linux/device.h>
 40 #include <linux/err.h>
 41 #include <linux/fs.h>
 42 #include <linux/poll.h>
 43 #include <linux/sched.h>
 44 #include <linux/file.h>
 45 #include <linux/cdev.h>
 46 #include <linux/anon_inodes.h>
 47 #include <linux/slab.h>
 48 
 49 #include <asm/uaccess.h>
 50 
 51 #include <rdma/ib.h>
 52 
 53 #include "uverbs.h"
 54 
 55 MODULE_AUTHOR("Roland Dreier");
 56 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
 57 MODULE_LICENSE("Dual BSD/GPL");
 58 
 59 enum {
 60         IB_UVERBS_MAJOR       = 231,
 61         IB_UVERBS_BASE_MINOR  = 192,
 62         IB_UVERBS_MAX_DEVICES = 32
 63 };
 64 
 65 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
 66 
 67 static struct class *uverbs_class;
 68 
 69 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
 70 DEFINE_IDR(ib_uverbs_pd_idr);
 71 DEFINE_IDR(ib_uverbs_mr_idr);
 72 DEFINE_IDR(ib_uverbs_mw_idr);
 73 DEFINE_IDR(ib_uverbs_ah_idr);
 74 DEFINE_IDR(ib_uverbs_cq_idr);
 75 DEFINE_IDR(ib_uverbs_qp_idr);
 76 DEFINE_IDR(ib_uverbs_srq_idr);
 77 DEFINE_IDR(ib_uverbs_xrcd_idr);
 78 DEFINE_IDR(ib_uverbs_rule_idr);
 79 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 };
141 
142 static void ib_uverbs_add_one(struct ib_device *device);
143 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
144 
145 int uverbs_dealloc_mw(struct ib_mw *mw)
146 {
147         struct ib_pd *pd = mw->pd;
148         int ret;
149 
150         ret = mw->device->dealloc_mw(mw);
151         if (!ret)
152                 atomic_dec(&pd->usecnt);
153         return ret;
154 }
155 
156 static void ib_uverbs_release_dev(struct kobject *kobj)
157 {
158         struct ib_uverbs_device *dev =
159                 container_of(kobj, struct ib_uverbs_device, kobj);
160 
161         cleanup_srcu_struct(&dev->disassociate_srcu);
162         kfree(dev);
163 }
164 
165 static struct kobj_type ib_uverbs_dev_ktype = {
166         .release = ib_uverbs_release_dev,
167 };
168 
169 static void ib_uverbs_release_event_file(struct kref *ref)
170 {
171         struct ib_uverbs_event_file *file =
172                 container_of(ref, struct ib_uverbs_event_file, ref);
173 
174         kfree(file);
175 }
176 
177 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
178                           struct ib_uverbs_event_file *ev_file,
179                           struct ib_ucq_object *uobj)
180 {
181         struct ib_uverbs_event *evt, *tmp;
182 
183         if (ev_file) {
184                 spin_lock_irq(&ev_file->lock);
185                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
186                         list_del(&evt->list);
187                         kfree(evt);
188                 }
189                 spin_unlock_irq(&ev_file->lock);
190 
191                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
192         }
193 
194         spin_lock_irq(&file->async_file->lock);
195         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
196                 list_del(&evt->list);
197                 kfree(evt);
198         }
199         spin_unlock_irq(&file->async_file->lock);
200 }
201 
202 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
203                               struct ib_uevent_object *uobj)
204 {
205         struct ib_uverbs_event *evt, *tmp;
206 
207         spin_lock_irq(&file->async_file->lock);
208         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
209                 list_del(&evt->list);
210                 kfree(evt);
211         }
212         spin_unlock_irq(&file->async_file->lock);
213 }
214 
215 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
216                                     struct ib_uqp_object *uobj)
217 {
218         struct ib_uverbs_mcast_entry *mcast, *tmp;
219 
220         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
221                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
222                 list_del(&mcast->list);
223                 kfree(mcast);
224         }
225 }
226 
227 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
228                                       struct ib_ucontext *context)
229 {
230         struct ib_uobject *uobj, *tmp;
231 
232         context->closing = 1;
233 
234         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
235                 struct ib_ah *ah = uobj->object;
236 
237                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
238                 ib_destroy_ah(ah);
239                 kfree(uobj);
240         }
241 
242         /* Remove MWs before QPs, in order to support type 2A MWs. */
243         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
244                 struct ib_mw *mw = uobj->object;
245 
246                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
247                 uverbs_dealloc_mw(mw);
248                 kfree(uobj);
249         }
250 
251         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
252                 struct ib_flow *flow_id = uobj->object;
253 
254                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
255                 ib_destroy_flow(flow_id);
256                 kfree(uobj);
257         }
258 
259         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
260                 struct ib_qp *qp = uobj->object;
261                 struct ib_uqp_object *uqp =
262                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
263 
264                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
265                 if (qp == qp->real_qp)
266                         ib_uverbs_detach_umcast(qp, uqp);
267                 ib_destroy_qp(qp);
268                 ib_uverbs_release_uevent(file, &uqp->uevent);
269                 kfree(uqp);
270         }
271 
272         list_for_each_entry_safe(uobj, tmp, &context->rwq_ind_tbl_list, list) {
273                 struct ib_rwq_ind_table *rwq_ind_tbl = uobj->object;
274                 struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl;
275 
276                 idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
277                 ib_destroy_rwq_ind_table(rwq_ind_tbl);
278                 kfree(ind_tbl);
279                 kfree(uobj);
280         }
281 
282         list_for_each_entry_safe(uobj, tmp, &context->wq_list, list) {
283                 struct ib_wq *wq = uobj->object;
284                 struct ib_uwq_object *uwq =
285                         container_of(uobj, struct ib_uwq_object, uevent.uobject);
286 
287                 idr_remove_uobj(&ib_uverbs_wq_idr, uobj);
288                 ib_destroy_wq(wq);
289                 ib_uverbs_release_uevent(file, &uwq->uevent);
290                 kfree(uwq);
291         }
292 
293         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
294                 struct ib_srq *srq = uobj->object;
295                 struct ib_uevent_object *uevent =
296                         container_of(uobj, struct ib_uevent_object, uobject);
297 
298                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
299                 ib_destroy_srq(srq);
300                 ib_uverbs_release_uevent(file, uevent);
301                 kfree(uevent);
302         }
303 
304         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
305                 struct ib_cq *cq = uobj->object;
306                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
307                 struct ib_ucq_object *ucq =
308                         container_of(uobj, struct ib_ucq_object, uobject);
309 
310                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
311                 ib_destroy_cq(cq);
312                 ib_uverbs_release_ucq(file, ev_file, ucq);
313                 kfree(ucq);
314         }
315 
316         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
317                 struct ib_mr *mr = uobj->object;
318 
319                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
320                 ib_dereg_mr(mr);
321                 kfree(uobj);
322         }
323 
324         mutex_lock(&file->device->xrcd_tree_mutex);
325         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
326                 struct ib_xrcd *xrcd = uobj->object;
327                 struct ib_uxrcd_object *uxrcd =
328                         container_of(uobj, struct ib_uxrcd_object, uobject);
329 
330                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
331                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
332                 kfree(uxrcd);
333         }
334         mutex_unlock(&file->device->xrcd_tree_mutex);
335 
336         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
337                 struct ib_pd *pd = uobj->object;
338 
339                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
340                 ib_dealloc_pd(pd);
341                 kfree(uobj);
342         }
343 
344         put_pid(context->tgid);
345 
346         return context->device->dealloc_ucontext(context);
347 }
348 
349 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
350 {
351         complete(&dev->comp);
352 }
353 
354 static void ib_uverbs_release_file(struct kref *ref)
355 {
356         struct ib_uverbs_file *file =
357                 container_of(ref, struct ib_uverbs_file, ref);
358         struct ib_device *ib_dev;
359         int srcu_key;
360 
361         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
362         ib_dev = srcu_dereference(file->device->ib_dev,
363                                   &file->device->disassociate_srcu);
364         if (ib_dev && !ib_dev->disassociate_ucontext)
365                 module_put(ib_dev->owner);
366         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
367 
368         if (atomic_dec_and_test(&file->device->refcount))
369                 ib_uverbs_comp_dev(file->device);
370 
371         kfree(file);
372 }
373 
374 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
375                                     size_t count, loff_t *pos)
376 {
377         struct ib_uverbs_event_file *file = filp->private_data;
378         struct ib_uverbs_event *event;
379         int eventsz;
380         int ret = 0;
381 
382         spin_lock_irq(&file->lock);
383 
384         while (list_empty(&file->event_list)) {
385                 spin_unlock_irq(&file->lock);
386 
387                 if (filp->f_flags & O_NONBLOCK)
388                         return -EAGAIN;
389 
390                 if (wait_event_interruptible(file->poll_wait,
391                                              (!list_empty(&file->event_list) ||
392                         /* The barriers built into wait_event_interruptible()
393                          * and wake_up() guarentee this will see the null set
394                          * without using RCU
395                          */
396                                              !file->uverbs_file->device->ib_dev)))
397                         return -ERESTARTSYS;
398 
399                 /* If device was disassociated and no event exists set an error */
400                 if (list_empty(&file->event_list) &&
401                     !file->uverbs_file->device->ib_dev)
402                         return -EIO;
403 
404                 spin_lock_irq(&file->lock);
405         }
406 
407         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
408 
409         if (file->is_async)
410                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
411         else
412                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
413 
414         if (eventsz > count) {
415                 ret   = -EINVAL;
416                 event = NULL;
417         } else {
418                 list_del(file->event_list.next);
419                 if (event->counter) {
420                         ++(*event->counter);
421                         list_del(&event->obj_list);
422                 }
423         }
424 
425         spin_unlock_irq(&file->lock);
426 
427         if (event) {
428                 if (copy_to_user(buf, event, eventsz))
429                         ret = -EFAULT;
430                 else
431                         ret = eventsz;
432         }
433 
434         kfree(event);
435 
436         return ret;
437 }
438 
439 static unsigned int ib_uverbs_event_poll(struct file *filp,
440                                          struct poll_table_struct *wait)
441 {
442         unsigned int pollflags = 0;
443         struct ib_uverbs_event_file *file = filp->private_data;
444 
445         poll_wait(filp, &file->poll_wait, wait);
446 
447         spin_lock_irq(&file->lock);
448         if (!list_empty(&file->event_list))
449                 pollflags = POLLIN | POLLRDNORM;
450         spin_unlock_irq(&file->lock);
451 
452         return pollflags;
453 }
454 
455 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
456 {
457         struct ib_uverbs_event_file *file = filp->private_data;
458 
459         return fasync_helper(fd, filp, on, &file->async_queue);
460 }
461 
462 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
463 {
464         struct ib_uverbs_event_file *file = filp->private_data;
465         struct ib_uverbs_event *entry, *tmp;
466         int closed_already = 0;
467 
468         mutex_lock(&file->uverbs_file->device->lists_mutex);
469         spin_lock_irq(&file->lock);
470         closed_already = file->is_closed;
471         file->is_closed = 1;
472         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
473                 if (entry->counter)
474                         list_del(&entry->obj_list);
475                 kfree(entry);
476         }
477         spin_unlock_irq(&file->lock);
478         if (!closed_already) {
479                 list_del(&file->list);
480                 if (file->is_async)
481                         ib_unregister_event_handler(&file->uverbs_file->
482                                 event_handler);
483         }
484         mutex_unlock(&file->uverbs_file->device->lists_mutex);
485 
486         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
487         kref_put(&file->ref, ib_uverbs_release_event_file);
488 
489         return 0;
490 }
491 
492 static const struct file_operations uverbs_event_fops = {
493         .owner   = THIS_MODULE,
494         .read    = ib_uverbs_event_read,
495         .poll    = ib_uverbs_event_poll,
496         .release = ib_uverbs_event_close,
497         .fasync  = ib_uverbs_event_fasync,
498         .llseek  = no_llseek,
499 };
500 
501 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
502 {
503         struct ib_uverbs_event_file    *file = cq_context;
504         struct ib_ucq_object           *uobj;
505         struct ib_uverbs_event         *entry;
506         unsigned long                   flags;
507 
508         if (!file)
509                 return;
510 
511         spin_lock_irqsave(&file->lock, flags);
512         if (file->is_closed) {
513                 spin_unlock_irqrestore(&file->lock, flags);
514                 return;
515         }
516 
517         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
518         if (!entry) {
519                 spin_unlock_irqrestore(&file->lock, flags);
520                 return;
521         }
522 
523         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
524 
525         entry->desc.comp.cq_handle = cq->uobject->user_handle;
526         entry->counter             = &uobj->comp_events_reported;
527 
528         list_add_tail(&entry->list, &file->event_list);
529         list_add_tail(&entry->obj_list, &uobj->comp_list);
530         spin_unlock_irqrestore(&file->lock, flags);
531 
532         wake_up_interruptible(&file->poll_wait);
533         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
534 }
535 
536 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
537                                     __u64 element, __u64 event,
538                                     struct list_head *obj_list,
539                                     u32 *counter)
540 {
541         struct ib_uverbs_event *entry;
542         unsigned long flags;
543 
544         spin_lock_irqsave(&file->async_file->lock, flags);
545         if (file->async_file->is_closed) {
546                 spin_unlock_irqrestore(&file->async_file->lock, flags);
547                 return;
548         }
549 
550         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
551         if (!entry) {
552                 spin_unlock_irqrestore(&file->async_file->lock, flags);
553                 return;
554         }
555 
556         entry->desc.async.element    = element;
557         entry->desc.async.event_type = event;
558         entry->desc.async.reserved   = 0;
559         entry->counter               = counter;
560 
561         list_add_tail(&entry->list, &file->async_file->event_list);
562         if (obj_list)
563                 list_add_tail(&entry->obj_list, obj_list);
564         spin_unlock_irqrestore(&file->async_file->lock, flags);
565 
566         wake_up_interruptible(&file->async_file->poll_wait);
567         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
568 }
569 
570 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
571 {
572         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
573                                                   struct ib_ucq_object, uobject);
574 
575         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
576                                 event->event, &uobj->async_list,
577                                 &uobj->async_events_reported);
578 }
579 
580 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
581 {
582         struct ib_uevent_object *uobj;
583 
584         /* for XRC target qp's, check that qp is live */
585         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
586                 return;
587 
588         uobj = container_of(event->element.qp->uobject,
589                             struct ib_uevent_object, uobject);
590 
591         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
592                                 event->event, &uobj->event_list,
593                                 &uobj->events_reported);
594 }
595 
596 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
597 {
598         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
599                                                   struct ib_uevent_object, uobject);
600 
601         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
602                                 event->event, &uobj->event_list,
603                                 &uobj->events_reported);
604 }
605 
606 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
607 {
608         struct ib_uevent_object *uobj;
609 
610         uobj = container_of(event->element.srq->uobject,
611                             struct ib_uevent_object, uobject);
612 
613         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
614                                 event->event, &uobj->event_list,
615                                 &uobj->events_reported);
616 }
617 
618 void ib_uverbs_event_handler(struct ib_event_handler *handler,
619                              struct ib_event *event)
620 {
621         struct ib_uverbs_file *file =
622                 container_of(handler, struct ib_uverbs_file, event_handler);
623 
624         ib_uverbs_async_handler(file, event->element.port_num, event->event,
625                                 NULL, NULL);
626 }
627 
628 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
629 {
630         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
631         file->async_file = NULL;
632 }
633 
634 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
635                                         struct ib_device        *ib_dev,
636                                         int is_async)
637 {
638         struct ib_uverbs_event_file *ev_file;
639         struct file *filp;
640         int ret;
641 
642         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
643         if (!ev_file)
644                 return ERR_PTR(-ENOMEM);
645 
646         kref_init(&ev_file->ref);
647         spin_lock_init(&ev_file->lock);
648         INIT_LIST_HEAD(&ev_file->event_list);
649         init_waitqueue_head(&ev_file->poll_wait);
650         ev_file->uverbs_file = uverbs_file;
651         kref_get(&ev_file->uverbs_file->ref);
652         ev_file->async_queue = NULL;
653         ev_file->is_closed   = 0;
654 
655         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
656                                   ev_file, O_RDONLY);
657         if (IS_ERR(filp))
658                 goto err_put_refs;
659 
660         mutex_lock(&uverbs_file->device->lists_mutex);
661         list_add_tail(&ev_file->list,
662                       &uverbs_file->device->uverbs_events_file_list);
663         mutex_unlock(&uverbs_file->device->lists_mutex);
664 
665         if (is_async) {
666                 WARN_ON(uverbs_file->async_file);
667                 uverbs_file->async_file = ev_file;
668                 kref_get(&uverbs_file->async_file->ref);
669                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
670                                       ib_dev,
671                                       ib_uverbs_event_handler);
672                 ret = ib_register_event_handler(&uverbs_file->event_handler);
673                 if (ret)
674                         goto err_put_file;
675 
676                 /* At that point async file stuff was fully set */
677                 ev_file->is_async = 1;
678         }
679 
680         return filp;
681 
682 err_put_file:
683         fput(filp);
684         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
685         uverbs_file->async_file = NULL;
686         return ERR_PTR(ret);
687 
688 err_put_refs:
689         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
690         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
691         return filp;
692 }
693 
694 /*
695  * Look up a completion event file by FD.  If lookup is successful,
696  * takes a ref to the event file struct that it returns; if
697  * unsuccessful, returns NULL.
698  */
699 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
700 {
701         struct ib_uverbs_event_file *ev_file = NULL;
702         struct fd f = fdget(fd);
703 
704         if (!f.file)
705                 return NULL;
706 
707         if (f.file->f_op != &uverbs_event_fops)
708                 goto out;
709 
710         ev_file = f.file->private_data;
711         if (ev_file->is_async) {
712                 ev_file = NULL;
713                 goto out;
714         }
715 
716         kref_get(&ev_file->ref);
717 
718 out:
719         fdput(f);
720         return ev_file;
721 }
722 
723 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
724 {
725         u64 mask;
726 
727         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
728                 mask = ib_dev->uverbs_cmd_mask;
729         else
730                 mask = ib_dev->uverbs_ex_cmd_mask;
731 
732         if (mask & ((u64)1 << command))
733                 return 0;
734 
735         return -1;
736 }
737 
738 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
739                              size_t count, loff_t *pos)
740 {
741         struct ib_uverbs_file *file = filp->private_data;
742         struct ib_device *ib_dev;
743         struct ib_uverbs_cmd_hdr hdr;
744         __u32 command;
745         __u32 flags;
746         int srcu_key;
747         ssize_t ret;
748 
749         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
750                 return -EACCES;
751 
752         if (count < sizeof hdr)
753                 return -EINVAL;
754 
755         if (copy_from_user(&hdr, buf, sizeof hdr))
756                 return -EFAULT;
757 
758         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
759         ib_dev = srcu_dereference(file->device->ib_dev,
760                                   &file->device->disassociate_srcu);
761         if (!ib_dev) {
762                 ret = -EIO;
763                 goto out;
764         }
765 
766         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
767                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
768                 ret = -EINVAL;
769                 goto out;
770         }
771 
772         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
773         if (verify_command_mask(ib_dev, command)) {
774                 ret = -EOPNOTSUPP;
775                 goto out;
776         }
777 
778         if (!file->ucontext &&
779             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
780                 ret = -EINVAL;
781                 goto out;
782         }
783 
784         flags = (hdr.command &
785                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
786 
787         if (!flags) {
788                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
789                     !uverbs_cmd_table[command]) {
790                         ret = -EINVAL;
791                         goto out;
792                 }
793 
794                 if (hdr.in_words * 4 != count) {
795                         ret = -EINVAL;
796                         goto out;
797                 }
798 
799                 ret = uverbs_cmd_table[command](file, ib_dev,
800                                                  buf + sizeof(hdr),
801                                                  hdr.in_words * 4,
802                                                  hdr.out_words * 4);
803 
804         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
805                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
806                 struct ib_udata ucore;
807                 struct ib_udata uhw;
808                 size_t written_count = count;
809 
810                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
811                     !uverbs_ex_cmd_table[command]) {
812                         ret = -ENOSYS;
813                         goto out;
814                 }
815 
816                 if (!file->ucontext) {
817                         ret = -EINVAL;
818                         goto out;
819                 }
820 
821                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
822                         ret = -EINVAL;
823                         goto out;
824                 }
825 
826                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
827                         ret = -EFAULT;
828                         goto out;
829                 }
830 
831                 count -= sizeof(hdr) + sizeof(ex_hdr);
832                 buf += sizeof(hdr) + sizeof(ex_hdr);
833 
834                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
835                         ret = -EINVAL;
836                         goto out;
837                 }
838 
839                 if (ex_hdr.cmd_hdr_reserved) {
840                         ret = -EINVAL;
841                         goto out;
842                 }
843 
844                 if (ex_hdr.response) {
845                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
846                                 ret = -EINVAL;
847                                 goto out;
848                         }
849 
850                         if (!access_ok(VERIFY_WRITE,
851                                        (void __user *) (unsigned long) ex_hdr.response,
852                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
853                                 ret = -EFAULT;
854                                 goto out;
855                         }
856                 } else {
857                         if (hdr.out_words || ex_hdr.provider_out_words) {
858                                 ret = -EINVAL;
859                                 goto out;
860                         }
861                 }
862 
863                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
864                                        hdr.in_words * 8, hdr.out_words * 8);
865 
866                 INIT_UDATA_BUF_OR_NULL(&uhw,
867                                        buf + ucore.inlen,
868                                        (unsigned long) ex_hdr.response + ucore.outlen,
869                                        ex_hdr.provider_in_words * 8,
870                                        ex_hdr.provider_out_words * 8);
871 
872                 ret = uverbs_ex_cmd_table[command](file,
873                                                    ib_dev,
874                                                    &ucore,
875                                                    &uhw);
876                 if (!ret)
877                         ret = written_count;
878         } else {
879                 ret = -ENOSYS;
880         }
881 
882 out:
883         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
884         return ret;
885 }
886 
887 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
888 {
889         struct ib_uverbs_file *file = filp->private_data;
890         struct ib_device *ib_dev;
891         int ret = 0;
892         int srcu_key;
893 
894         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
895         ib_dev = srcu_dereference(file->device->ib_dev,
896                                   &file->device->disassociate_srcu);
897         if (!ib_dev) {
898                 ret = -EIO;
899                 goto out;
900         }
901 
902         if (!file->ucontext)
903                 ret = -ENODEV;
904         else
905                 ret = ib_dev->mmap(file->ucontext, vma);
906 out:
907         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
908         return ret;
909 }
910 
911 /*
912  * ib_uverbs_open() does not need the BKL:
913  *
914  *  - the ib_uverbs_device structures are properly reference counted and
915  *    everything else is purely local to the file being created, so
916  *    races against other open calls are not a problem;
917  *  - there is no ioctl method to race against;
918  *  - the open method will either immediately run -ENXIO, or all
919  *    required initialization will be done.
920  */
921 static int ib_uverbs_open(struct inode *inode, struct file *filp)
922 {
923         struct ib_uverbs_device *dev;
924         struct ib_uverbs_file *file;
925         struct ib_device *ib_dev;
926         int ret;
927         int module_dependent;
928         int srcu_key;
929 
930         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
931         if (!atomic_inc_not_zero(&dev->refcount))
932                 return -ENXIO;
933 
934         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
935         mutex_lock(&dev->lists_mutex);
936         ib_dev = srcu_dereference(dev->ib_dev,
937                                   &dev->disassociate_srcu);
938         if (!ib_dev) {
939                 ret = -EIO;
940                 goto err;
941         }
942 
943         /* In case IB device supports disassociate ucontext, there is no hard
944          * dependency between uverbs device and its low level device.
945          */
946         module_dependent = !(ib_dev->disassociate_ucontext);
947 
948         if (module_dependent) {
949                 if (!try_module_get(ib_dev->owner)) {
950                         ret = -ENODEV;
951                         goto err;
952                 }
953         }
954 
955         file = kzalloc(sizeof(*file), GFP_KERNEL);
956         if (!file) {
957                 ret = -ENOMEM;
958                 if (module_dependent)
959                         goto err_module;
960 
961                 goto err;
962         }
963 
964         file->device     = dev;
965         file->ucontext   = NULL;
966         file->async_file = NULL;
967         kref_init(&file->ref);
968         mutex_init(&file->mutex);
969         mutex_init(&file->cleanup_mutex);
970 
971         filp->private_data = file;
972         kobject_get(&dev->kobj);
973         list_add_tail(&file->list, &dev->uverbs_file_list);
974         mutex_unlock(&dev->lists_mutex);
975         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
976 
977         return nonseekable_open(inode, filp);
978 
979 err_module:
980         module_put(ib_dev->owner);
981 
982 err:
983         mutex_unlock(&dev->lists_mutex);
984         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
985         if (atomic_dec_and_test(&dev->refcount))
986                 ib_uverbs_comp_dev(dev);
987 
988         return ret;
989 }
990 
991 static int ib_uverbs_close(struct inode *inode, struct file *filp)
992 {
993         struct ib_uverbs_file *file = filp->private_data;
994         struct ib_uverbs_device *dev = file->device;
995 
996         mutex_lock(&file->cleanup_mutex);
997         if (file->ucontext) {
998                 ib_uverbs_cleanup_ucontext(file, file->ucontext);
999                 file->ucontext = NULL;
1000         }
1001         mutex_unlock(&file->cleanup_mutex);
1002 
1003         mutex_lock(&file->device->lists_mutex);
1004         if (!file->is_closed) {
1005                 list_del(&file->list);
1006                 file->is_closed = 1;
1007         }
1008         mutex_unlock(&file->device->lists_mutex);
1009 
1010         if (file->async_file)
1011                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
1012 
1013         kref_put(&file->ref, ib_uverbs_release_file);
1014         kobject_put(&dev->kobj);
1015 
1016         return 0;
1017 }
1018 
1019 static const struct file_operations uverbs_fops = {
1020         .owner   = THIS_MODULE,
1021         .write   = ib_uverbs_write,
1022         .open    = ib_uverbs_open,
1023         .release = ib_uverbs_close,
1024         .llseek  = no_llseek,
1025 };
1026 
1027 static const struct file_operations uverbs_mmap_fops = {
1028         .owner   = THIS_MODULE,
1029         .write   = ib_uverbs_write,
1030         .mmap    = ib_uverbs_mmap,
1031         .open    = ib_uverbs_open,
1032         .release = ib_uverbs_close,
1033         .llseek  = no_llseek,
1034 };
1035 
1036 static struct ib_client uverbs_client = {
1037         .name   = "uverbs",
1038         .add    = ib_uverbs_add_one,
1039         .remove = ib_uverbs_remove_one
1040 };
1041 
1042 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1043                           char *buf)
1044 {
1045         int ret = -ENODEV;
1046         int srcu_key;
1047         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1048         struct ib_device *ib_dev;
1049 
1050         if (!dev)
1051                 return -ENODEV;
1052 
1053         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1054         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1055         if (ib_dev)
1056                 ret = sprintf(buf, "%s\n", ib_dev->name);
1057         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1058 
1059         return ret;
1060 }
1061 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1062 
1063 static ssize_t show_dev_abi_version(struct device *device,
1064                                     struct device_attribute *attr, char *buf)
1065 {
1066         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1067         int ret = -ENODEV;
1068         int srcu_key;
1069         struct ib_device *ib_dev;
1070 
1071         if (!dev)
1072                 return -ENODEV;
1073         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1074         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1075         if (ib_dev)
1076                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1077         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1078 
1079         return ret;
1080 }
1081 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1082 
1083 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1084                          __stringify(IB_USER_VERBS_ABI_VERSION));
1085 
1086 static dev_t overflow_maj;
1087 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1088 
1089 /*
1090  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1091  * requesting a new major number and doubling the number of max devices we
1092  * support. It's stupid, but simple.
1093  */
1094 static int find_overflow_devnum(void)
1095 {
1096         int ret;
1097 
1098         if (!overflow_maj) {
1099                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1100                                           "infiniband_verbs");
1101                 if (ret) {
1102                         pr_err("user_verbs: couldn't register dynamic device number\n");
1103                         return ret;
1104                 }
1105         }
1106 
1107         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1108         if (ret >= IB_UVERBS_MAX_DEVICES)
1109                 return -1;
1110 
1111         return ret;
1112 }
1113 
1114 static void ib_uverbs_add_one(struct ib_device *device)
1115 {
1116         int devnum;
1117         dev_t base;
1118         struct ib_uverbs_device *uverbs_dev;
1119         int ret;
1120 
1121         if (!device->alloc_ucontext)
1122                 return;
1123 
1124         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1125         if (!uverbs_dev)
1126                 return;
1127 
1128         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1129         if (ret) {
1130                 kfree(uverbs_dev);
1131                 return;
1132         }
1133 
1134         atomic_set(&uverbs_dev->refcount, 1);
1135         init_completion(&uverbs_dev->comp);
1136         uverbs_dev->xrcd_tree = RB_ROOT;
1137         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1138         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1139         mutex_init(&uverbs_dev->lists_mutex);
1140         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1141         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1142 
1143         spin_lock(&map_lock);
1144         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1145         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1146                 spin_unlock(&map_lock);
1147                 devnum = find_overflow_devnum();
1148                 if (devnum < 0)
1149                         goto err;
1150 
1151                 spin_lock(&map_lock);
1152                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1153                 base = devnum + overflow_maj;
1154                 set_bit(devnum, overflow_map);
1155         } else {
1156                 uverbs_dev->devnum = devnum;
1157                 base = devnum + IB_UVERBS_BASE_DEV;
1158                 set_bit(devnum, dev_map);
1159         }
1160         spin_unlock(&map_lock);
1161 
1162         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1163         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1164 
1165         cdev_init(&uverbs_dev->cdev, NULL);
1166         uverbs_dev->cdev.owner = THIS_MODULE;
1167         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1168         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1169         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1170         if (cdev_add(&uverbs_dev->cdev, base, 1))
1171                 goto err_cdev;
1172 
1173         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1174                                         uverbs_dev->cdev.dev, uverbs_dev,
1175                                         "uverbs%d", uverbs_dev->devnum);
1176         if (IS_ERR(uverbs_dev->dev))
1177                 goto err_cdev;
1178 
1179         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1180                 goto err_class;
1181         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1182                 goto err_class;
1183 
1184         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1185 
1186         return;
1187 
1188 err_class:
1189         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1190 
1191 err_cdev:
1192         cdev_del(&uverbs_dev->cdev);
1193         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1194                 clear_bit(devnum, dev_map);
1195         else
1196                 clear_bit(devnum, overflow_map);
1197 
1198 err:
1199         if (atomic_dec_and_test(&uverbs_dev->refcount))
1200                 ib_uverbs_comp_dev(uverbs_dev);
1201         wait_for_completion(&uverbs_dev->comp);
1202         kobject_put(&uverbs_dev->kobj);
1203         return;
1204 }
1205 
1206 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1207                                         struct ib_device *ib_dev)
1208 {
1209         struct ib_uverbs_file *file;
1210         struct ib_uverbs_event_file *event_file;
1211         struct ib_event event;
1212 
1213         /* Pending running commands to terminate */
1214         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1215         event.event = IB_EVENT_DEVICE_FATAL;
1216         event.element.port_num = 0;
1217         event.device = ib_dev;
1218 
1219         mutex_lock(&uverbs_dev->lists_mutex);
1220         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1221                 struct ib_ucontext *ucontext;
1222                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1223                                         struct ib_uverbs_file, list);
1224                 file->is_closed = 1;
1225                 list_del(&file->list);
1226                 kref_get(&file->ref);
1227                 mutex_unlock(&uverbs_dev->lists_mutex);
1228 
1229                 ib_uverbs_event_handler(&file->event_handler, &event);
1230 
1231                 mutex_lock(&file->cleanup_mutex);
1232                 ucontext = file->ucontext;
1233                 file->ucontext = NULL;
1234                 mutex_unlock(&file->cleanup_mutex);
1235 
1236                 /* At this point ib_uverbs_close cannot be running
1237                  * ib_uverbs_cleanup_ucontext
1238                  */
1239                 if (ucontext) {
1240                         /* We must release the mutex before going ahead and
1241                          * calling disassociate_ucontext. disassociate_ucontext
1242                          * might end up indirectly calling uverbs_close,
1243                          * for example due to freeing the resources
1244                          * (e.g mmput).
1245                          */
1246                         ib_dev->disassociate_ucontext(ucontext);
1247                         ib_uverbs_cleanup_ucontext(file, ucontext);
1248                 }
1249 
1250                 mutex_lock(&uverbs_dev->lists_mutex);
1251                 kref_put(&file->ref, ib_uverbs_release_file);
1252         }
1253 
1254         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1255                 event_file = list_first_entry(&uverbs_dev->
1256                                               uverbs_events_file_list,
1257                                               struct ib_uverbs_event_file,
1258                                               list);
1259                 spin_lock_irq(&event_file->lock);
1260                 event_file->is_closed = 1;
1261                 spin_unlock_irq(&event_file->lock);
1262 
1263                 list_del(&event_file->list);
1264                 if (event_file->is_async) {
1265                         ib_unregister_event_handler(&event_file->uverbs_file->
1266                                                     event_handler);
1267                         event_file->uverbs_file->event_handler.device = NULL;
1268                 }
1269 
1270                 wake_up_interruptible(&event_file->poll_wait);
1271                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1272         }
1273         mutex_unlock(&uverbs_dev->lists_mutex);
1274 }
1275 
1276 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1277 {
1278         struct ib_uverbs_device *uverbs_dev = client_data;
1279         int wait_clients = 1;
1280 
1281         if (!uverbs_dev)
1282                 return;
1283 
1284         dev_set_drvdata(uverbs_dev->dev, NULL);
1285         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1286         cdev_del(&uverbs_dev->cdev);
1287 
1288         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1289                 clear_bit(uverbs_dev->devnum, dev_map);
1290         else
1291                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1292 
1293         if (device->disassociate_ucontext) {
1294                 /* We disassociate HW resources and immediately return.
1295                  * Userspace will see a EIO errno for all future access.
1296                  * Upon returning, ib_device may be freed internally and is not
1297                  * valid any more.
1298                  * uverbs_device is still available until all clients close
1299                  * their files, then the uverbs device ref count will be zero
1300                  * and its resources will be freed.
1301                  * Note: At this point no more files can be opened since the
1302                  * cdev was deleted, however active clients can still issue
1303                  * commands and close their open files.
1304                  */
1305                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1306                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1307                 wait_clients = 0;
1308         }
1309 
1310         if (atomic_dec_and_test(&uverbs_dev->refcount))
1311                 ib_uverbs_comp_dev(uverbs_dev);
1312         if (wait_clients)
1313                 wait_for_completion(&uverbs_dev->comp);
1314         kobject_put(&uverbs_dev->kobj);
1315 }
1316 
1317 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1318 {
1319         if (mode)
1320                 *mode = 0666;
1321         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1322 }
1323 
1324 static int __init ib_uverbs_init(void)
1325 {
1326         int ret;
1327 
1328         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1329                                      "infiniband_verbs");
1330         if (ret) {
1331                 pr_err("user_verbs: couldn't register device number\n");
1332                 goto out;
1333         }
1334 
1335         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1336         if (IS_ERR(uverbs_class)) {
1337                 ret = PTR_ERR(uverbs_class);
1338                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1339                 goto out_chrdev;
1340         }
1341 
1342         uverbs_class->devnode = uverbs_devnode;
1343 
1344         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1345         if (ret) {
1346                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1347                 goto out_class;
1348         }
1349 
1350         ret = ib_register_client(&uverbs_client);
1351         if (ret) {
1352                 pr_err("user_verbs: couldn't register client\n");
1353                 goto out_class;
1354         }
1355 
1356         return 0;
1357 
1358 out_class:
1359         class_destroy(uverbs_class);
1360 
1361 out_chrdev:
1362         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1363 
1364 out:
1365         return ret;
1366 }
1367 
1368 static void __exit ib_uverbs_cleanup(void)
1369 {
1370         ib_unregister_client(&uverbs_client);
1371         class_destroy(uverbs_class);
1372         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1373         if (overflow_maj)
1374                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1375         idr_destroy(&ib_uverbs_pd_idr);
1376         idr_destroy(&ib_uverbs_mr_idr);
1377         idr_destroy(&ib_uverbs_mw_idr);
1378         idr_destroy(&ib_uverbs_ah_idr);
1379         idr_destroy(&ib_uverbs_cq_idr);
1380         idr_destroy(&ib_uverbs_qp_idr);
1381         idr_destroy(&ib_uverbs_srq_idr);
1382 }
1383 
1384 module_init(ib_uverbs_init);
1385 module_exit(ib_uverbs_cleanup);
1386 

This page was automatically generated by LXR 0.3.1 (source).  •  Linux is a registered trademark of Linus Torvalds  •  Contact us