Version:  2.0.40 2.2.26 2.4.37 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16 3.17 3.18 3.19 4.0 4.1

Linux/drivers/infiniband/core/uverbs_main.c

  1 /*
  2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
  3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
  4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
  5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
  6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
  7  *
  8  * This software is available to you under a choice of one of two
  9  * licenses.  You may choose to be licensed under the terms of the GNU
 10  * General Public License (GPL) Version 2, available from the file
 11  * COPYING in the main directory of this source tree, or the
 12  * OpenIB.org BSD license below:
 13  *
 14  *     Redistribution and use in source and binary forms, with or
 15  *     without modification, are permitted provided that the following
 16  *     conditions are met:
 17  *
 18  *      - Redistributions of source code must retain the above
 19  *        copyright notice, this list of conditions and the following
 20  *        disclaimer.
 21  *
 22  *      - Redistributions in binary form must reproduce the above
 23  *        copyright notice, this list of conditions and the following
 24  *        disclaimer in the documentation and/or other materials
 25  *        provided with the distribution.
 26  *
 27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 34  * SOFTWARE.
 35  */
 36 
 37 #include <linux/module.h>
 38 #include <linux/init.h>
 39 #include <linux/device.h>
 40 #include <linux/err.h>
 41 #include <linux/fs.h>
 42 #include <linux/poll.h>
 43 #include <linux/sched.h>
 44 #include <linux/file.h>
 45 #include <linux/cdev.h>
 46 #include <linux/anon_inodes.h>
 47 #include <linux/slab.h>
 48 
 49 #include <asm/uaccess.h>
 50 
 51 #include "uverbs.h"
 52 
 53 MODULE_AUTHOR("Roland Dreier");
 54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
 55 MODULE_LICENSE("Dual BSD/GPL");
 56 
 57 enum {
 58         IB_UVERBS_MAJOR       = 231,
 59         IB_UVERBS_BASE_MINOR  = 192,
 60         IB_UVERBS_MAX_DEVICES = 32
 61 };
 62 
 63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
 64 
 65 static struct class *uverbs_class;
 66 
 67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
 68 DEFINE_IDR(ib_uverbs_pd_idr);
 69 DEFINE_IDR(ib_uverbs_mr_idr);
 70 DEFINE_IDR(ib_uverbs_mw_idr);
 71 DEFINE_IDR(ib_uverbs_ah_idr);
 72 DEFINE_IDR(ib_uverbs_cq_idr);
 73 DEFINE_IDR(ib_uverbs_qp_idr);
 74 DEFINE_IDR(ib_uverbs_srq_idr);
 75 DEFINE_IDR(ib_uverbs_xrcd_idr);
 76 DEFINE_IDR(ib_uverbs_rule_idr);
 77 
 78 static DEFINE_SPINLOCK(map_lock);
 79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
 80 
 81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
 82                                      const char __user *buf, int in_len,
 83                                      int out_len) = {
 84         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
 85         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
 86         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
 87         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
 88         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
 89         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
 90         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
 91         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
 92         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
 93         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
 94         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
 95         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
 96         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
 97         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
 98         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 99         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
100         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
101         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
102         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
103         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
104         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
105         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
106         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
107         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
108         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
109         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
110         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
111         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
112         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
113         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
114         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
115         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
116         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
117         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
118         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
119 };
120 
121 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
122                                     struct ib_udata *ucore,
123                                     struct ib_udata *uhw) = {
124         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
125         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
126         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
127 };
128 
129 static void ib_uverbs_add_one(struct ib_device *device);
130 static void ib_uverbs_remove_one(struct ib_device *device);
131 
132 static void ib_uverbs_release_dev(struct kref *ref)
133 {
134         struct ib_uverbs_device *dev =
135                 container_of(ref, struct ib_uverbs_device, ref);
136 
137         complete(&dev->comp);
138 }
139 
140 static void ib_uverbs_release_event_file(struct kref *ref)
141 {
142         struct ib_uverbs_event_file *file =
143                 container_of(ref, struct ib_uverbs_event_file, ref);
144 
145         kfree(file);
146 }
147 
148 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
149                           struct ib_uverbs_event_file *ev_file,
150                           struct ib_ucq_object *uobj)
151 {
152         struct ib_uverbs_event *evt, *tmp;
153 
154         if (ev_file) {
155                 spin_lock_irq(&ev_file->lock);
156                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
157                         list_del(&evt->list);
158                         kfree(evt);
159                 }
160                 spin_unlock_irq(&ev_file->lock);
161 
162                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
163         }
164 
165         spin_lock_irq(&file->async_file->lock);
166         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
167                 list_del(&evt->list);
168                 kfree(evt);
169         }
170         spin_unlock_irq(&file->async_file->lock);
171 }
172 
173 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
174                               struct ib_uevent_object *uobj)
175 {
176         struct ib_uverbs_event *evt, *tmp;
177 
178         spin_lock_irq(&file->async_file->lock);
179         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
180                 list_del(&evt->list);
181                 kfree(evt);
182         }
183         spin_unlock_irq(&file->async_file->lock);
184 }
185 
186 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
187                                     struct ib_uqp_object *uobj)
188 {
189         struct ib_uverbs_mcast_entry *mcast, *tmp;
190 
191         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
192                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
193                 list_del(&mcast->list);
194                 kfree(mcast);
195         }
196 }
197 
198 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
199                                       struct ib_ucontext *context)
200 {
201         struct ib_uobject *uobj, *tmp;
202 
203         if (!context)
204                 return 0;
205 
206         context->closing = 1;
207 
208         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
209                 struct ib_ah *ah = uobj->object;
210 
211                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
212                 ib_destroy_ah(ah);
213                 kfree(uobj);
214         }
215 
216         /* Remove MWs before QPs, in order to support type 2A MWs. */
217         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
218                 struct ib_mw *mw = uobj->object;
219 
220                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
221                 ib_dealloc_mw(mw);
222                 kfree(uobj);
223         }
224 
225         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
226                 struct ib_flow *flow_id = uobj->object;
227 
228                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
229                 ib_destroy_flow(flow_id);
230                 kfree(uobj);
231         }
232 
233         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
234                 struct ib_qp *qp = uobj->object;
235                 struct ib_uqp_object *uqp =
236                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
237 
238                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
239                 if (qp != qp->real_qp) {
240                         ib_close_qp(qp);
241                 } else {
242                         ib_uverbs_detach_umcast(qp, uqp);
243                         ib_destroy_qp(qp);
244                 }
245                 ib_uverbs_release_uevent(file, &uqp->uevent);
246                 kfree(uqp);
247         }
248 
249         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
250                 struct ib_srq *srq = uobj->object;
251                 struct ib_uevent_object *uevent =
252                         container_of(uobj, struct ib_uevent_object, uobject);
253 
254                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
255                 ib_destroy_srq(srq);
256                 ib_uverbs_release_uevent(file, uevent);
257                 kfree(uevent);
258         }
259 
260         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
261                 struct ib_cq *cq = uobj->object;
262                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
263                 struct ib_ucq_object *ucq =
264                         container_of(uobj, struct ib_ucq_object, uobject);
265 
266                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
267                 ib_destroy_cq(cq);
268                 ib_uverbs_release_ucq(file, ev_file, ucq);
269                 kfree(ucq);
270         }
271 
272         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
273                 struct ib_mr *mr = uobj->object;
274 
275                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
276                 ib_dereg_mr(mr);
277                 kfree(uobj);
278         }
279 
280         mutex_lock(&file->device->xrcd_tree_mutex);
281         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
282                 struct ib_xrcd *xrcd = uobj->object;
283                 struct ib_uxrcd_object *uxrcd =
284                         container_of(uobj, struct ib_uxrcd_object, uobject);
285 
286                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
287                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
288                 kfree(uxrcd);
289         }
290         mutex_unlock(&file->device->xrcd_tree_mutex);
291 
292         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
293                 struct ib_pd *pd = uobj->object;
294 
295                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
296                 ib_dealloc_pd(pd);
297                 kfree(uobj);
298         }
299 
300         put_pid(context->tgid);
301 
302         return context->device->dealloc_ucontext(context);
303 }
304 
305 static void ib_uverbs_release_file(struct kref *ref)
306 {
307         struct ib_uverbs_file *file =
308                 container_of(ref, struct ib_uverbs_file, ref);
309 
310         module_put(file->device->ib_dev->owner);
311         kref_put(&file->device->ref, ib_uverbs_release_dev);
312 
313         kfree(file);
314 }
315 
316 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
317                                     size_t count, loff_t *pos)
318 {
319         struct ib_uverbs_event_file *file = filp->private_data;
320         struct ib_uverbs_event *event;
321         int eventsz;
322         int ret = 0;
323 
324         spin_lock_irq(&file->lock);
325 
326         while (list_empty(&file->event_list)) {
327                 spin_unlock_irq(&file->lock);
328 
329                 if (filp->f_flags & O_NONBLOCK)
330                         return -EAGAIN;
331 
332                 if (wait_event_interruptible(file->poll_wait,
333                                              !list_empty(&file->event_list)))
334                         return -ERESTARTSYS;
335 
336                 spin_lock_irq(&file->lock);
337         }
338 
339         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
340 
341         if (file->is_async)
342                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
343         else
344                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
345 
346         if (eventsz > count) {
347                 ret   = -EINVAL;
348                 event = NULL;
349         } else {
350                 list_del(file->event_list.next);
351                 if (event->counter) {
352                         ++(*event->counter);
353                         list_del(&event->obj_list);
354                 }
355         }
356 
357         spin_unlock_irq(&file->lock);
358 
359         if (event) {
360                 if (copy_to_user(buf, event, eventsz))
361                         ret = -EFAULT;
362                 else
363                         ret = eventsz;
364         }
365 
366         kfree(event);
367 
368         return ret;
369 }
370 
371 static unsigned int ib_uverbs_event_poll(struct file *filp,
372                                          struct poll_table_struct *wait)
373 {
374         unsigned int pollflags = 0;
375         struct ib_uverbs_event_file *file = filp->private_data;
376 
377         poll_wait(filp, &file->poll_wait, wait);
378 
379         spin_lock_irq(&file->lock);
380         if (!list_empty(&file->event_list))
381                 pollflags = POLLIN | POLLRDNORM;
382         spin_unlock_irq(&file->lock);
383 
384         return pollflags;
385 }
386 
387 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
388 {
389         struct ib_uverbs_event_file *file = filp->private_data;
390 
391         return fasync_helper(fd, filp, on, &file->async_queue);
392 }
393 
394 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
395 {
396         struct ib_uverbs_event_file *file = filp->private_data;
397         struct ib_uverbs_event *entry, *tmp;
398 
399         spin_lock_irq(&file->lock);
400         file->is_closed = 1;
401         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
402                 if (entry->counter)
403                         list_del(&entry->obj_list);
404                 kfree(entry);
405         }
406         spin_unlock_irq(&file->lock);
407 
408         if (file->is_async) {
409                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
410                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
411         }
412         kref_put(&file->ref, ib_uverbs_release_event_file);
413 
414         return 0;
415 }
416 
417 static const struct file_operations uverbs_event_fops = {
418         .owner   = THIS_MODULE,
419         .read    = ib_uverbs_event_read,
420         .poll    = ib_uverbs_event_poll,
421         .release = ib_uverbs_event_close,
422         .fasync  = ib_uverbs_event_fasync,
423         .llseek  = no_llseek,
424 };
425 
426 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
427 {
428         struct ib_uverbs_event_file    *file = cq_context;
429         struct ib_ucq_object           *uobj;
430         struct ib_uverbs_event         *entry;
431         unsigned long                   flags;
432 
433         if (!file)
434                 return;
435 
436         spin_lock_irqsave(&file->lock, flags);
437         if (file->is_closed) {
438                 spin_unlock_irqrestore(&file->lock, flags);
439                 return;
440         }
441 
442         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
443         if (!entry) {
444                 spin_unlock_irqrestore(&file->lock, flags);
445                 return;
446         }
447 
448         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
449 
450         entry->desc.comp.cq_handle = cq->uobject->user_handle;
451         entry->counter             = &uobj->comp_events_reported;
452 
453         list_add_tail(&entry->list, &file->event_list);
454         list_add_tail(&entry->obj_list, &uobj->comp_list);
455         spin_unlock_irqrestore(&file->lock, flags);
456 
457         wake_up_interruptible(&file->poll_wait);
458         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
459 }
460 
461 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
462                                     __u64 element, __u64 event,
463                                     struct list_head *obj_list,
464                                     u32 *counter)
465 {
466         struct ib_uverbs_event *entry;
467         unsigned long flags;
468 
469         spin_lock_irqsave(&file->async_file->lock, flags);
470         if (file->async_file->is_closed) {
471                 spin_unlock_irqrestore(&file->async_file->lock, flags);
472                 return;
473         }
474 
475         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
476         if (!entry) {
477                 spin_unlock_irqrestore(&file->async_file->lock, flags);
478                 return;
479         }
480 
481         entry->desc.async.element    = element;
482         entry->desc.async.event_type = event;
483         entry->desc.async.reserved   = 0;
484         entry->counter               = counter;
485 
486         list_add_tail(&entry->list, &file->async_file->event_list);
487         if (obj_list)
488                 list_add_tail(&entry->obj_list, obj_list);
489         spin_unlock_irqrestore(&file->async_file->lock, flags);
490 
491         wake_up_interruptible(&file->async_file->poll_wait);
492         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
493 }
494 
495 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
496 {
497         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
498                                                   struct ib_ucq_object, uobject);
499 
500         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
501                                 event->event, &uobj->async_list,
502                                 &uobj->async_events_reported);
503 }
504 
505 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
506 {
507         struct ib_uevent_object *uobj;
508 
509         /* for XRC target qp's, check that qp is live */
510         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
511                 return;
512 
513         uobj = container_of(event->element.qp->uobject,
514                             struct ib_uevent_object, uobject);
515 
516         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
517                                 event->event, &uobj->event_list,
518                                 &uobj->events_reported);
519 }
520 
521 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
522 {
523         struct ib_uevent_object *uobj;
524 
525         uobj = container_of(event->element.srq->uobject,
526                             struct ib_uevent_object, uobject);
527 
528         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
529                                 event->event, &uobj->event_list,
530                                 &uobj->events_reported);
531 }
532 
533 void ib_uverbs_event_handler(struct ib_event_handler *handler,
534                              struct ib_event *event)
535 {
536         struct ib_uverbs_file *file =
537                 container_of(handler, struct ib_uverbs_file, event_handler);
538 
539         ib_uverbs_async_handler(file, event->element.port_num, event->event,
540                                 NULL, NULL);
541 }
542 
543 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
544                                         int is_async)
545 {
546         struct ib_uverbs_event_file *ev_file;
547         struct file *filp;
548 
549         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
550         if (!ev_file)
551                 return ERR_PTR(-ENOMEM);
552 
553         kref_init(&ev_file->ref);
554         spin_lock_init(&ev_file->lock);
555         INIT_LIST_HEAD(&ev_file->event_list);
556         init_waitqueue_head(&ev_file->poll_wait);
557         ev_file->uverbs_file = uverbs_file;
558         ev_file->async_queue = NULL;
559         ev_file->is_async    = is_async;
560         ev_file->is_closed   = 0;
561 
562         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
563                                   ev_file, O_RDONLY);
564         if (IS_ERR(filp))
565                 kfree(ev_file);
566 
567         return filp;
568 }
569 
570 /*
571  * Look up a completion event file by FD.  If lookup is successful,
572  * takes a ref to the event file struct that it returns; if
573  * unsuccessful, returns NULL.
574  */
575 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
576 {
577         struct ib_uverbs_event_file *ev_file = NULL;
578         struct fd f = fdget(fd);
579 
580         if (!f.file)
581                 return NULL;
582 
583         if (f.file->f_op != &uverbs_event_fops)
584                 goto out;
585 
586         ev_file = f.file->private_data;
587         if (ev_file->is_async) {
588                 ev_file = NULL;
589                 goto out;
590         }
591 
592         kref_get(&ev_file->ref);
593 
594 out:
595         fdput(f);
596         return ev_file;
597 }
598 
599 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
600                              size_t count, loff_t *pos)
601 {
602         struct ib_uverbs_file *file = filp->private_data;
603         struct ib_uverbs_cmd_hdr hdr;
604         __u32 flags;
605 
606         if (count < sizeof hdr)
607                 return -EINVAL;
608 
609         if (copy_from_user(&hdr, buf, sizeof hdr))
610                 return -EFAULT;
611 
612         flags = (hdr.command &
613                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
614 
615         if (!flags) {
616                 __u32 command;
617 
618                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
619                                            IB_USER_VERBS_CMD_COMMAND_MASK))
620                         return -EINVAL;
621 
622                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
623 
624                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
625                     !uverbs_cmd_table[command])
626                         return -EINVAL;
627 
628                 if (!file->ucontext &&
629                     command != IB_USER_VERBS_CMD_GET_CONTEXT)
630                         return -EINVAL;
631 
632                 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
633                         return -ENOSYS;
634 
635                 if (hdr.in_words * 4 != count)
636                         return -EINVAL;
637 
638                 return uverbs_cmd_table[command](file,
639                                                  buf + sizeof(hdr),
640                                                  hdr.in_words * 4,
641                                                  hdr.out_words * 4);
642 
643         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
644                 __u32 command;
645 
646                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
647                 struct ib_udata ucore;
648                 struct ib_udata uhw;
649                 int err;
650                 size_t written_count = count;
651 
652                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
653                                            IB_USER_VERBS_CMD_COMMAND_MASK))
654                         return -EINVAL;
655 
656                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
657 
658                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
659                     !uverbs_ex_cmd_table[command])
660                         return -ENOSYS;
661 
662                 if (!file->ucontext)
663                         return -EINVAL;
664 
665                 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
666                         return -ENOSYS;
667 
668                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
669                         return -EINVAL;
670 
671                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
672                         return -EFAULT;
673 
674                 count -= sizeof(hdr) + sizeof(ex_hdr);
675                 buf += sizeof(hdr) + sizeof(ex_hdr);
676 
677                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
678                         return -EINVAL;
679 
680                 if (ex_hdr.cmd_hdr_reserved)
681                         return -EINVAL;
682 
683                 if (ex_hdr.response) {
684                         if (!hdr.out_words && !ex_hdr.provider_out_words)
685                                 return -EINVAL;
686 
687                         if (!access_ok(VERIFY_WRITE,
688                                        (void __user *) (unsigned long) ex_hdr.response,
689                                        (hdr.out_words + ex_hdr.provider_out_words) * 8))
690                                 return -EFAULT;
691                 } else {
692                         if (hdr.out_words || ex_hdr.provider_out_words)
693                                 return -EINVAL;
694                 }
695 
696                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
697                                        hdr.in_words * 8, hdr.out_words * 8);
698 
699                 INIT_UDATA_BUF_OR_NULL(&uhw,
700                                        buf + ucore.inlen,
701                                        (unsigned long) ex_hdr.response + ucore.outlen,
702                                        ex_hdr.provider_in_words * 8,
703                                        ex_hdr.provider_out_words * 8);
704 
705                 err = uverbs_ex_cmd_table[command](file,
706                                                    &ucore,
707                                                    &uhw);
708 
709                 if (err)
710                         return err;
711 
712                 return written_count;
713         }
714 
715         return -ENOSYS;
716 }
717 
718 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
719 {
720         struct ib_uverbs_file *file = filp->private_data;
721 
722         if (!file->ucontext)
723                 return -ENODEV;
724         else
725                 return file->device->ib_dev->mmap(file->ucontext, vma);
726 }
727 
728 /*
729  * ib_uverbs_open() does not need the BKL:
730  *
731  *  - the ib_uverbs_device structures are properly reference counted and
732  *    everything else is purely local to the file being created, so
733  *    races against other open calls are not a problem;
734  *  - there is no ioctl method to race against;
735  *  - the open method will either immediately run -ENXIO, or all
736  *    required initialization will be done.
737  */
738 static int ib_uverbs_open(struct inode *inode, struct file *filp)
739 {
740         struct ib_uverbs_device *dev;
741         struct ib_uverbs_file *file;
742         int ret;
743 
744         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
745         if (dev)
746                 kref_get(&dev->ref);
747         else
748                 return -ENXIO;
749 
750         if (!try_module_get(dev->ib_dev->owner)) {
751                 ret = -ENODEV;
752                 goto err;
753         }
754 
755         file = kmalloc(sizeof *file, GFP_KERNEL);
756         if (!file) {
757                 ret = -ENOMEM;
758                 goto err_module;
759         }
760 
761         file->device     = dev;
762         file->ucontext   = NULL;
763         file->async_file = NULL;
764         kref_init(&file->ref);
765         mutex_init(&file->mutex);
766 
767         filp->private_data = file;
768 
769         return nonseekable_open(inode, filp);
770 
771 err_module:
772         module_put(dev->ib_dev->owner);
773 
774 err:
775         kref_put(&dev->ref, ib_uverbs_release_dev);
776         return ret;
777 }
778 
779 static int ib_uverbs_close(struct inode *inode, struct file *filp)
780 {
781         struct ib_uverbs_file *file = filp->private_data;
782 
783         ib_uverbs_cleanup_ucontext(file, file->ucontext);
784 
785         if (file->async_file)
786                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
787 
788         kref_put(&file->ref, ib_uverbs_release_file);
789 
790         return 0;
791 }
792 
793 static const struct file_operations uverbs_fops = {
794         .owner   = THIS_MODULE,
795         .write   = ib_uverbs_write,
796         .open    = ib_uverbs_open,
797         .release = ib_uverbs_close,
798         .llseek  = no_llseek,
799 };
800 
801 static const struct file_operations uverbs_mmap_fops = {
802         .owner   = THIS_MODULE,
803         .write   = ib_uverbs_write,
804         .mmap    = ib_uverbs_mmap,
805         .open    = ib_uverbs_open,
806         .release = ib_uverbs_close,
807         .llseek  = no_llseek,
808 };
809 
810 static struct ib_client uverbs_client = {
811         .name   = "uverbs",
812         .add    = ib_uverbs_add_one,
813         .remove = ib_uverbs_remove_one
814 };
815 
816 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
817                           char *buf)
818 {
819         struct ib_uverbs_device *dev = dev_get_drvdata(device);
820 
821         if (!dev)
822                 return -ENODEV;
823 
824         return sprintf(buf, "%s\n", dev->ib_dev->name);
825 }
826 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
827 
828 static ssize_t show_dev_abi_version(struct device *device,
829                                     struct device_attribute *attr, char *buf)
830 {
831         struct ib_uverbs_device *dev = dev_get_drvdata(device);
832 
833         if (!dev)
834                 return -ENODEV;
835 
836         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
837 }
838 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
839 
840 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
841                          __stringify(IB_USER_VERBS_ABI_VERSION));
842 
843 static dev_t overflow_maj;
844 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
845 
846 /*
847  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
848  * requesting a new major number and doubling the number of max devices we
849  * support. It's stupid, but simple.
850  */
851 static int find_overflow_devnum(void)
852 {
853         int ret;
854 
855         if (!overflow_maj) {
856                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
857                                           "infiniband_verbs");
858                 if (ret) {
859                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
860                         return ret;
861                 }
862         }
863 
864         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
865         if (ret >= IB_UVERBS_MAX_DEVICES)
866                 return -1;
867 
868         return ret;
869 }
870 
871 static void ib_uverbs_add_one(struct ib_device *device)
872 {
873         int devnum;
874         dev_t base;
875         struct ib_uverbs_device *uverbs_dev;
876 
877         if (!device->alloc_ucontext)
878                 return;
879 
880         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
881         if (!uverbs_dev)
882                 return;
883 
884         kref_init(&uverbs_dev->ref);
885         init_completion(&uverbs_dev->comp);
886         uverbs_dev->xrcd_tree = RB_ROOT;
887         mutex_init(&uverbs_dev->xrcd_tree_mutex);
888 
889         spin_lock(&map_lock);
890         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
891         if (devnum >= IB_UVERBS_MAX_DEVICES) {
892                 spin_unlock(&map_lock);
893                 devnum = find_overflow_devnum();
894                 if (devnum < 0)
895                         goto err;
896 
897                 spin_lock(&map_lock);
898                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
899                 base = devnum + overflow_maj;
900                 set_bit(devnum, overflow_map);
901         } else {
902                 uverbs_dev->devnum = devnum;
903                 base = devnum + IB_UVERBS_BASE_DEV;
904                 set_bit(devnum, dev_map);
905         }
906         spin_unlock(&map_lock);
907 
908         uverbs_dev->ib_dev           = device;
909         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
910 
911         cdev_init(&uverbs_dev->cdev, NULL);
912         uverbs_dev->cdev.owner = THIS_MODULE;
913         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
914         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
915         if (cdev_add(&uverbs_dev->cdev, base, 1))
916                 goto err_cdev;
917 
918         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
919                                         uverbs_dev->cdev.dev, uverbs_dev,
920                                         "uverbs%d", uverbs_dev->devnum);
921         if (IS_ERR(uverbs_dev->dev))
922                 goto err_cdev;
923 
924         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
925                 goto err_class;
926         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
927                 goto err_class;
928 
929         ib_set_client_data(device, &uverbs_client, uverbs_dev);
930 
931         return;
932 
933 err_class:
934         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
935 
936 err_cdev:
937         cdev_del(&uverbs_dev->cdev);
938         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
939                 clear_bit(devnum, dev_map);
940         else
941                 clear_bit(devnum, overflow_map);
942 
943 err:
944         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
945         wait_for_completion(&uverbs_dev->comp);
946         kfree(uverbs_dev);
947         return;
948 }
949 
950 static void ib_uverbs_remove_one(struct ib_device *device)
951 {
952         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
953 
954         if (!uverbs_dev)
955                 return;
956 
957         dev_set_drvdata(uverbs_dev->dev, NULL);
958         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
959         cdev_del(&uverbs_dev->cdev);
960 
961         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
962                 clear_bit(uverbs_dev->devnum, dev_map);
963         else
964                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
965 
966         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
967         wait_for_completion(&uverbs_dev->comp);
968         kfree(uverbs_dev);
969 }
970 
971 static char *uverbs_devnode(struct device *dev, umode_t *mode)
972 {
973         if (mode)
974                 *mode = 0666;
975         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
976 }
977 
978 static int __init ib_uverbs_init(void)
979 {
980         int ret;
981 
982         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
983                                      "infiniband_verbs");
984         if (ret) {
985                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
986                 goto out;
987         }
988 
989         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
990         if (IS_ERR(uverbs_class)) {
991                 ret = PTR_ERR(uverbs_class);
992                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
993                 goto out_chrdev;
994         }
995 
996         uverbs_class->devnode = uverbs_devnode;
997 
998         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
999         if (ret) {
1000                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1001                 goto out_class;
1002         }
1003 
1004         ret = ib_register_client(&uverbs_client);
1005         if (ret) {
1006                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1007                 goto out_class;
1008         }
1009 
1010         return 0;
1011 
1012 out_class:
1013         class_destroy(uverbs_class);
1014 
1015 out_chrdev:
1016         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1017 
1018 out:
1019         return ret;
1020 }
1021 
1022 static void __exit ib_uverbs_cleanup(void)
1023 {
1024         ib_unregister_client(&uverbs_client);
1025         class_destroy(uverbs_class);
1026         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1027         if (overflow_maj)
1028                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1029         idr_destroy(&ib_uverbs_pd_idr);
1030         idr_destroy(&ib_uverbs_mr_idr);
1031         idr_destroy(&ib_uverbs_mw_idr);
1032         idr_destroy(&ib_uverbs_ah_idr);
1033         idr_destroy(&ib_uverbs_cq_idr);
1034         idr_destroy(&ib_uverbs_qp_idr);
1035         idr_destroy(&ib_uverbs_srq_idr);
1036 }
1037 
1038 module_init(ib_uverbs_init);
1039 module_exit(ib_uverbs_cleanup);
1040 

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