Version:  2.0.40 2.2.26 2.4.37 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 3.8 3.9 3.10 3.11 3.12 3.13 3.14 3.15 3.16

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

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