Version:  2.0.40 2.2.26 2.4.37 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 3.17

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 };
127 
128 static void ib_uverbs_add_one(struct ib_device *device);
129 static void ib_uverbs_remove_one(struct ib_device *device);
130 
131 static void ib_uverbs_release_dev(struct kref *ref)
132 {
133         struct ib_uverbs_device *dev =
134                 container_of(ref, struct ib_uverbs_device, ref);
135 
136         complete(&dev->comp);
137 }
138 
139 static void ib_uverbs_release_event_file(struct kref *ref)
140 {
141         struct ib_uverbs_event_file *file =
142                 container_of(ref, struct ib_uverbs_event_file, ref);
143 
144         kfree(file);
145 }
146 
147 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
148                           struct ib_uverbs_event_file *ev_file,
149                           struct ib_ucq_object *uobj)
150 {
151         struct ib_uverbs_event *evt, *tmp;
152 
153         if (ev_file) {
154                 spin_lock_irq(&ev_file->lock);
155                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
156                         list_del(&evt->list);
157                         kfree(evt);
158                 }
159                 spin_unlock_irq(&ev_file->lock);
160 
161                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
162         }
163 
164         spin_lock_irq(&file->async_file->lock);
165         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
166                 list_del(&evt->list);
167                 kfree(evt);
168         }
169         spin_unlock_irq(&file->async_file->lock);
170 }
171 
172 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
173                               struct ib_uevent_object *uobj)
174 {
175         struct ib_uverbs_event *evt, *tmp;
176 
177         spin_lock_irq(&file->async_file->lock);
178         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
179                 list_del(&evt->list);
180                 kfree(evt);
181         }
182         spin_unlock_irq(&file->async_file->lock);
183 }
184 
185 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
186                                     struct ib_uqp_object *uobj)
187 {
188         struct ib_uverbs_mcast_entry *mcast, *tmp;
189 
190         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
191                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
192                 list_del(&mcast->list);
193                 kfree(mcast);
194         }
195 }
196 
197 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
198                                       struct ib_ucontext *context)
199 {
200         struct ib_uobject *uobj, *tmp;
201 
202         if (!context)
203                 return 0;
204 
205         context->closing = 1;
206 
207         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
208                 struct ib_ah *ah = uobj->object;
209 
210                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
211                 ib_destroy_ah(ah);
212                 kfree(uobj);
213         }
214 
215         /* Remove MWs before QPs, in order to support type 2A MWs. */
216         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
217                 struct ib_mw *mw = uobj->object;
218 
219                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
220                 ib_dealloc_mw(mw);
221                 kfree(uobj);
222         }
223 
224         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
225                 struct ib_flow *flow_id = uobj->object;
226 
227                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
228                 ib_destroy_flow(flow_id);
229                 kfree(uobj);
230         }
231 
232         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
233                 struct ib_qp *qp = uobj->object;
234                 struct ib_uqp_object *uqp =
235                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
236 
237                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
238                 if (qp != qp->real_qp) {
239                         ib_close_qp(qp);
240                 } else {
241                         ib_uverbs_detach_umcast(qp, uqp);
242                         ib_destroy_qp(qp);
243                 }
244                 ib_uverbs_release_uevent(file, &uqp->uevent);
245                 kfree(uqp);
246         }
247 
248         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
249                 struct ib_cq *cq = uobj->object;
250                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
251                 struct ib_ucq_object *ucq =
252                         container_of(uobj, struct ib_ucq_object, uobject);
253 
254                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
255                 ib_destroy_cq(cq);
256                 ib_uverbs_release_ucq(file, ev_file, ucq);
257                 kfree(ucq);
258         }
259 
260         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
261                 struct ib_srq *srq = uobj->object;
262                 struct ib_uevent_object *uevent =
263                         container_of(uobj, struct ib_uevent_object, uobject);
264 
265                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
266                 ib_destroy_srq(srq);
267                 ib_uverbs_release_uevent(file, uevent);
268                 kfree(uevent);
269         }
270 
271         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
272                 struct ib_mr *mr = uobj->object;
273 
274                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
275                 ib_dereg_mr(mr);
276                 kfree(uobj);
277         }
278 
279         mutex_lock(&file->device->xrcd_tree_mutex);
280         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
281                 struct ib_xrcd *xrcd = uobj->object;
282                 struct ib_uxrcd_object *uxrcd =
283                         container_of(uobj, struct ib_uxrcd_object, uobject);
284 
285                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
286                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
287                 kfree(uxrcd);
288         }
289         mutex_unlock(&file->device->xrcd_tree_mutex);
290 
291         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
292                 struct ib_pd *pd = uobj->object;
293 
294                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
295                 ib_dealloc_pd(pd);
296                 kfree(uobj);
297         }
298 
299         return context->device->dealloc_ucontext(context);
300 }
301 
302 static void ib_uverbs_release_file(struct kref *ref)
303 {
304         struct ib_uverbs_file *file =
305                 container_of(ref, struct ib_uverbs_file, ref);
306 
307         module_put(file->device->ib_dev->owner);
308         kref_put(&file->device->ref, ib_uverbs_release_dev);
309 
310         kfree(file);
311 }
312 
313 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
314                                     size_t count, loff_t *pos)
315 {
316         struct ib_uverbs_event_file *file = filp->private_data;
317         struct ib_uverbs_event *event;
318         int eventsz;
319         int ret = 0;
320 
321         spin_lock_irq(&file->lock);
322 
323         while (list_empty(&file->event_list)) {
324                 spin_unlock_irq(&file->lock);
325 
326                 if (filp->f_flags & O_NONBLOCK)
327                         return -EAGAIN;
328 
329                 if (wait_event_interruptible(file->poll_wait,
330                                              !list_empty(&file->event_list)))
331                         return -ERESTARTSYS;
332 
333                 spin_lock_irq(&file->lock);
334         }
335 
336         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
337 
338         if (file->is_async)
339                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
340         else
341                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
342 
343         if (eventsz > count) {
344                 ret   = -EINVAL;
345                 event = NULL;
346         } else {
347                 list_del(file->event_list.next);
348                 if (event->counter) {
349                         ++(*event->counter);
350                         list_del(&event->obj_list);
351                 }
352         }
353 
354         spin_unlock_irq(&file->lock);
355 
356         if (event) {
357                 if (copy_to_user(buf, event, eventsz))
358                         ret = -EFAULT;
359                 else
360                         ret = eventsz;
361         }
362 
363         kfree(event);
364 
365         return ret;
366 }
367 
368 static unsigned int ib_uverbs_event_poll(struct file *filp,
369                                          struct poll_table_struct *wait)
370 {
371         unsigned int pollflags = 0;
372         struct ib_uverbs_event_file *file = filp->private_data;
373 
374         poll_wait(filp, &file->poll_wait, wait);
375 
376         spin_lock_irq(&file->lock);
377         if (!list_empty(&file->event_list))
378                 pollflags = POLLIN | POLLRDNORM;
379         spin_unlock_irq(&file->lock);
380 
381         return pollflags;
382 }
383 
384 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
385 {
386         struct ib_uverbs_event_file *file = filp->private_data;
387 
388         return fasync_helper(fd, filp, on, &file->async_queue);
389 }
390 
391 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
392 {
393         struct ib_uverbs_event_file *file = filp->private_data;
394         struct ib_uverbs_event *entry, *tmp;
395 
396         spin_lock_irq(&file->lock);
397         file->is_closed = 1;
398         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
399                 if (entry->counter)
400                         list_del(&entry->obj_list);
401                 kfree(entry);
402         }
403         spin_unlock_irq(&file->lock);
404 
405         if (file->is_async) {
406                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
407                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
408         }
409         kref_put(&file->ref, ib_uverbs_release_event_file);
410 
411         return 0;
412 }
413 
414 static const struct file_operations uverbs_event_fops = {
415         .owner   = THIS_MODULE,
416         .read    = ib_uverbs_event_read,
417         .poll    = ib_uverbs_event_poll,
418         .release = ib_uverbs_event_close,
419         .fasync  = ib_uverbs_event_fasync,
420         .llseek  = no_llseek,
421 };
422 
423 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
424 {
425         struct ib_uverbs_event_file    *file = cq_context;
426         struct ib_ucq_object           *uobj;
427         struct ib_uverbs_event         *entry;
428         unsigned long                   flags;
429 
430         if (!file)
431                 return;
432 
433         spin_lock_irqsave(&file->lock, flags);
434         if (file->is_closed) {
435                 spin_unlock_irqrestore(&file->lock, flags);
436                 return;
437         }
438 
439         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
440         if (!entry) {
441                 spin_unlock_irqrestore(&file->lock, flags);
442                 return;
443         }
444 
445         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
446 
447         entry->desc.comp.cq_handle = cq->uobject->user_handle;
448         entry->counter             = &uobj->comp_events_reported;
449 
450         list_add_tail(&entry->list, &file->event_list);
451         list_add_tail(&entry->obj_list, &uobj->comp_list);
452         spin_unlock_irqrestore(&file->lock, flags);
453 
454         wake_up_interruptible(&file->poll_wait);
455         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
456 }
457 
458 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
459                                     __u64 element, __u64 event,
460                                     struct list_head *obj_list,
461                                     u32 *counter)
462 {
463         struct ib_uverbs_event *entry;
464         unsigned long flags;
465 
466         spin_lock_irqsave(&file->async_file->lock, flags);
467         if (file->async_file->is_closed) {
468                 spin_unlock_irqrestore(&file->async_file->lock, flags);
469                 return;
470         }
471 
472         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
473         if (!entry) {
474                 spin_unlock_irqrestore(&file->async_file->lock, flags);
475                 return;
476         }
477 
478         entry->desc.async.element    = element;
479         entry->desc.async.event_type = event;
480         entry->counter               = counter;
481 
482         list_add_tail(&entry->list, &file->async_file->event_list);
483         if (obj_list)
484                 list_add_tail(&entry->obj_list, obj_list);
485         spin_unlock_irqrestore(&file->async_file->lock, flags);
486 
487         wake_up_interruptible(&file->async_file->poll_wait);
488         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
489 }
490 
491 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
492 {
493         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
494                                                   struct ib_ucq_object, uobject);
495 
496         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
497                                 event->event, &uobj->async_list,
498                                 &uobj->async_events_reported);
499 }
500 
501 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
502 {
503         struct ib_uevent_object *uobj;
504 
505         uobj = container_of(event->element.qp->uobject,
506                             struct ib_uevent_object, uobject);
507 
508         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
509                                 event->event, &uobj->event_list,
510                                 &uobj->events_reported);
511 }
512 
513 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
514 {
515         struct ib_uevent_object *uobj;
516 
517         uobj = container_of(event->element.srq->uobject,
518                             struct ib_uevent_object, uobject);
519 
520         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
521                                 event->event, &uobj->event_list,
522                                 &uobj->events_reported);
523 }
524 
525 void ib_uverbs_event_handler(struct ib_event_handler *handler,
526                              struct ib_event *event)
527 {
528         struct ib_uverbs_file *file =
529                 container_of(handler, struct ib_uverbs_file, event_handler);
530 
531         ib_uverbs_async_handler(file, event->element.port_num, event->event,
532                                 NULL, NULL);
533 }
534 
535 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
536                                         int is_async)
537 {
538         struct ib_uverbs_event_file *ev_file;
539         struct file *filp;
540 
541         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
542         if (!ev_file)
543                 return ERR_PTR(-ENOMEM);
544 
545         kref_init(&ev_file->ref);
546         spin_lock_init(&ev_file->lock);
547         INIT_LIST_HEAD(&ev_file->event_list);
548         init_waitqueue_head(&ev_file->poll_wait);
549         ev_file->uverbs_file = uverbs_file;
550         ev_file->async_queue = NULL;
551         ev_file->is_async    = is_async;
552         ev_file->is_closed   = 0;
553 
554         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
555                                   ev_file, O_RDONLY);
556         if (IS_ERR(filp))
557                 kfree(ev_file);
558 
559         return filp;
560 }
561 
562 /*
563  * Look up a completion event file by FD.  If lookup is successful,
564  * takes a ref to the event file struct that it returns; if
565  * unsuccessful, returns NULL.
566  */
567 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
568 {
569         struct ib_uverbs_event_file *ev_file = NULL;
570         struct fd f = fdget(fd);
571 
572         if (!f.file)
573                 return NULL;
574 
575         if (f.file->f_op != &uverbs_event_fops)
576                 goto out;
577 
578         ev_file = f.file->private_data;
579         if (ev_file->is_async) {
580                 ev_file = NULL;
581                 goto out;
582         }
583 
584         kref_get(&ev_file->ref);
585 
586 out:
587         fdput(f);
588         return ev_file;
589 }
590 
591 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
592                              size_t count, loff_t *pos)
593 {
594         struct ib_uverbs_file *file = filp->private_data;
595         struct ib_uverbs_cmd_hdr hdr;
596         __u32 flags;
597 
598         if (count < sizeof hdr)
599                 return -EINVAL;
600 
601         if (copy_from_user(&hdr, buf, sizeof hdr))
602                 return -EFAULT;
603 
604         flags = (hdr.command &
605                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
606 
607         if (!flags) {
608                 __u32 command;
609 
610                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
611                                            IB_USER_VERBS_CMD_COMMAND_MASK))
612                         return -EINVAL;
613 
614                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
615 
616                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
617                     !uverbs_cmd_table[command])
618                         return -EINVAL;
619 
620                 if (!file->ucontext &&
621                     command != IB_USER_VERBS_CMD_GET_CONTEXT)
622                         return -EINVAL;
623 
624                 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
625                         return -ENOSYS;
626 
627                 if (hdr.in_words * 4 != count)
628                         return -EINVAL;
629 
630                 return uverbs_cmd_table[command](file,
631                                                  buf + sizeof(hdr),
632                                                  hdr.in_words * 4,
633                                                  hdr.out_words * 4);
634 
635         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
636                 __u32 command;
637 
638                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
639                 struct ib_udata ucore;
640                 struct ib_udata uhw;
641                 int err;
642                 size_t written_count = count;
643 
644                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
645                                            IB_USER_VERBS_CMD_COMMAND_MASK))
646                         return -EINVAL;
647 
648                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
649 
650                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
651                     !uverbs_ex_cmd_table[command])
652                         return -ENOSYS;
653 
654                 if (!file->ucontext)
655                         return -EINVAL;
656 
657                 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
658                         return -ENOSYS;
659 
660                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
661                         return -EINVAL;
662 
663                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
664                         return -EFAULT;
665 
666                 count -= sizeof(hdr) + sizeof(ex_hdr);
667                 buf += sizeof(hdr) + sizeof(ex_hdr);
668 
669                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
670                         return -EINVAL;
671 
672                 if (ex_hdr.cmd_hdr_reserved)
673                         return -EINVAL;
674 
675                 if (ex_hdr.response) {
676                         if (!hdr.out_words && !ex_hdr.provider_out_words)
677                                 return -EINVAL;
678 
679                         if (!access_ok(VERIFY_WRITE,
680                                        (void __user *) (unsigned long) ex_hdr.response,
681                                        (hdr.out_words + ex_hdr.provider_out_words) * 8))
682                                 return -EFAULT;
683                 } else {
684                         if (hdr.out_words || ex_hdr.provider_out_words)
685                                 return -EINVAL;
686                 }
687 
688                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
689                                        hdr.in_words * 8, hdr.out_words * 8);
690 
691                 INIT_UDATA_BUF_OR_NULL(&uhw,
692                                        buf + ucore.inlen,
693                                        (unsigned long) ex_hdr.response + ucore.outlen,
694                                        ex_hdr.provider_in_words * 8,
695                                        ex_hdr.provider_out_words * 8);
696 
697                 err = uverbs_ex_cmd_table[command](file,
698                                                    &ucore,
699                                                    &uhw);
700 
701                 if (err)
702                         return err;
703 
704                 return written_count;
705         }
706 
707         return -ENOSYS;
708 }
709 
710 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
711 {
712         struct ib_uverbs_file *file = filp->private_data;
713 
714         if (!file->ucontext)
715                 return -ENODEV;
716         else
717                 return file->device->ib_dev->mmap(file->ucontext, vma);
718 }
719 
720 /*
721  * ib_uverbs_open() does not need the BKL:
722  *
723  *  - the ib_uverbs_device structures are properly reference counted and
724  *    everything else is purely local to the file being created, so
725  *    races against other open calls are not a problem;
726  *  - there is no ioctl method to race against;
727  *  - the open method will either immediately run -ENXIO, or all
728  *    required initialization will be done.
729  */
730 static int ib_uverbs_open(struct inode *inode, struct file *filp)
731 {
732         struct ib_uverbs_device *dev;
733         struct ib_uverbs_file *file;
734         int ret;
735 
736         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
737         if (dev)
738                 kref_get(&dev->ref);
739         else
740                 return -ENXIO;
741 
742         if (!try_module_get(dev->ib_dev->owner)) {
743                 ret = -ENODEV;
744                 goto err;
745         }
746 
747         file = kmalloc(sizeof *file, GFP_KERNEL);
748         if (!file) {
749                 ret = -ENOMEM;
750                 goto err_module;
751         }
752 
753         file->device     = dev;
754         file->ucontext   = NULL;
755         file->async_file = NULL;
756         kref_init(&file->ref);
757         mutex_init(&file->mutex);
758 
759         filp->private_data = file;
760 
761         return nonseekable_open(inode, filp);
762 
763 err_module:
764         module_put(dev->ib_dev->owner);
765 
766 err:
767         kref_put(&dev->ref, ib_uverbs_release_dev);
768         return ret;
769 }
770 
771 static int ib_uverbs_close(struct inode *inode, struct file *filp)
772 {
773         struct ib_uverbs_file *file = filp->private_data;
774 
775         ib_uverbs_cleanup_ucontext(file, file->ucontext);
776 
777         if (file->async_file)
778                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
779 
780         kref_put(&file->ref, ib_uverbs_release_file);
781 
782         return 0;
783 }
784 
785 static const struct file_operations uverbs_fops = {
786         .owner   = THIS_MODULE,
787         .write   = ib_uverbs_write,
788         .open    = ib_uverbs_open,
789         .release = ib_uverbs_close,
790         .llseek  = no_llseek,
791 };
792 
793 static const struct file_operations uverbs_mmap_fops = {
794         .owner   = THIS_MODULE,
795         .write   = ib_uverbs_write,
796         .mmap    = ib_uverbs_mmap,
797         .open    = ib_uverbs_open,
798         .release = ib_uverbs_close,
799         .llseek  = no_llseek,
800 };
801 
802 static struct ib_client uverbs_client = {
803         .name   = "uverbs",
804         .add    = ib_uverbs_add_one,
805         .remove = ib_uverbs_remove_one
806 };
807 
808 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
809                           char *buf)
810 {
811         struct ib_uverbs_device *dev = dev_get_drvdata(device);
812 
813         if (!dev)
814                 return -ENODEV;
815 
816         return sprintf(buf, "%s\n", dev->ib_dev->name);
817 }
818 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
819 
820 static ssize_t show_dev_abi_version(struct device *device,
821                                     struct device_attribute *attr, char *buf)
822 {
823         struct ib_uverbs_device *dev = dev_get_drvdata(device);
824 
825         if (!dev)
826                 return -ENODEV;
827 
828         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
829 }
830 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
831 
832 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
833                          __stringify(IB_USER_VERBS_ABI_VERSION));
834 
835 static dev_t overflow_maj;
836 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
837 
838 /*
839  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
840  * requesting a new major number and doubling the number of max devices we
841  * support. It's stupid, but simple.
842  */
843 static int find_overflow_devnum(void)
844 {
845         int ret;
846 
847         if (!overflow_maj) {
848                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
849                                           "infiniband_verbs");
850                 if (ret) {
851                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
852                         return ret;
853                 }
854         }
855 
856         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
857         if (ret >= IB_UVERBS_MAX_DEVICES)
858                 return -1;
859 
860         return ret;
861 }
862 
863 static void ib_uverbs_add_one(struct ib_device *device)
864 {
865         int devnum;
866         dev_t base;
867         struct ib_uverbs_device *uverbs_dev;
868 
869         if (!device->alloc_ucontext)
870                 return;
871 
872         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
873         if (!uverbs_dev)
874                 return;
875 
876         kref_init(&uverbs_dev->ref);
877         init_completion(&uverbs_dev->comp);
878         uverbs_dev->xrcd_tree = RB_ROOT;
879         mutex_init(&uverbs_dev->xrcd_tree_mutex);
880 
881         spin_lock(&map_lock);
882         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
883         if (devnum >= IB_UVERBS_MAX_DEVICES) {
884                 spin_unlock(&map_lock);
885                 devnum = find_overflow_devnum();
886                 if (devnum < 0)
887                         goto err;
888 
889                 spin_lock(&map_lock);
890                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
891                 base = devnum + overflow_maj;
892                 set_bit(devnum, overflow_map);
893         } else {
894                 uverbs_dev->devnum = devnum;
895                 base = devnum + IB_UVERBS_BASE_DEV;
896                 set_bit(devnum, dev_map);
897         }
898         spin_unlock(&map_lock);
899 
900         uverbs_dev->ib_dev           = device;
901         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
902 
903         cdev_init(&uverbs_dev->cdev, NULL);
904         uverbs_dev->cdev.owner = THIS_MODULE;
905         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
906         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
907         if (cdev_add(&uverbs_dev->cdev, base, 1))
908                 goto err_cdev;
909 
910         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
911                                         uverbs_dev->cdev.dev, uverbs_dev,
912                                         "uverbs%d", uverbs_dev->devnum);
913         if (IS_ERR(uverbs_dev->dev))
914                 goto err_cdev;
915 
916         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
917                 goto err_class;
918         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
919                 goto err_class;
920 
921         ib_set_client_data(device, &uverbs_client, uverbs_dev);
922 
923         return;
924 
925 err_class:
926         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
927 
928 err_cdev:
929         cdev_del(&uverbs_dev->cdev);
930         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
931                 clear_bit(devnum, dev_map);
932         else
933                 clear_bit(devnum, overflow_map);
934 
935 err:
936         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
937         wait_for_completion(&uverbs_dev->comp);
938         kfree(uverbs_dev);
939         return;
940 }
941 
942 static void ib_uverbs_remove_one(struct ib_device *device)
943 {
944         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
945 
946         if (!uverbs_dev)
947                 return;
948 
949         dev_set_drvdata(uverbs_dev->dev, NULL);
950         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
951         cdev_del(&uverbs_dev->cdev);
952 
953         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
954                 clear_bit(uverbs_dev->devnum, dev_map);
955         else
956                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
957 
958         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
959         wait_for_completion(&uverbs_dev->comp);
960         kfree(uverbs_dev);
961 }
962 
963 static char *uverbs_devnode(struct device *dev, umode_t *mode)
964 {
965         if (mode)
966                 *mode = 0666;
967         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
968 }
969 
970 static int __init ib_uverbs_init(void)
971 {
972         int ret;
973 
974         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
975                                      "infiniband_verbs");
976         if (ret) {
977                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
978                 goto out;
979         }
980 
981         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
982         if (IS_ERR(uverbs_class)) {
983                 ret = PTR_ERR(uverbs_class);
984                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
985                 goto out_chrdev;
986         }
987 
988         uverbs_class->devnode = uverbs_devnode;
989 
990         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
991         if (ret) {
992                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
993                 goto out_class;
994         }
995 
996         ret = ib_register_client(&uverbs_client);
997         if (ret) {
998                 printk(KERN_ERR "user_verbs: couldn't register client\n");
999                 goto out_class;
1000         }
1001 
1002         return 0;
1003 
1004 out_class:
1005         class_destroy(uverbs_class);
1006 
1007 out_chrdev:
1008         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1009 
1010 out:
1011         return ret;
1012 }
1013 
1014 static void __exit ib_uverbs_cleanup(void)
1015 {
1016         ib_unregister_client(&uverbs_client);
1017         class_destroy(uverbs_class);
1018         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1019         if (overflow_maj)
1020                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1021         idr_destroy(&ib_uverbs_pd_idr);
1022         idr_destroy(&ib_uverbs_mr_idr);
1023         idr_destroy(&ib_uverbs_mw_idr);
1024         idr_destroy(&ib_uverbs_ah_idr);
1025         idr_destroy(&ib_uverbs_cq_idr);
1026         idr_destroy(&ib_uverbs_qp_idr);
1027         idr_destroy(&ib_uverbs_srq_idr);
1028 }
1029 
1030 module_init(ib_uverbs_init);
1031 module_exit(ib_uverbs_cleanup);
1032 

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