Version:  2.0.40 2.2.26 2.4.37 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 3.18 3.19

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         put_pid(context->tgid);
300 
301         return context->device->dealloc_ucontext(context);
302 }
303 
304 static void ib_uverbs_release_file(struct kref *ref)
305 {
306         struct ib_uverbs_file *file =
307                 container_of(ref, struct ib_uverbs_file, ref);
308 
309         module_put(file->device->ib_dev->owner);
310         kref_put(&file->device->ref, ib_uverbs_release_dev);
311 
312         kfree(file);
313 }
314 
315 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
316                                     size_t count, loff_t *pos)
317 {
318         struct ib_uverbs_event_file *file = filp->private_data;
319         struct ib_uverbs_event *event;
320         int eventsz;
321         int ret = 0;
322 
323         spin_lock_irq(&file->lock);
324 
325         while (list_empty(&file->event_list)) {
326                 spin_unlock_irq(&file->lock);
327 
328                 if (filp->f_flags & O_NONBLOCK)
329                         return -EAGAIN;
330 
331                 if (wait_event_interruptible(file->poll_wait,
332                                              !list_empty(&file->event_list)))
333                         return -ERESTARTSYS;
334 
335                 spin_lock_irq(&file->lock);
336         }
337 
338         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
339 
340         if (file->is_async)
341                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
342         else
343                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
344 
345         if (eventsz > count) {
346                 ret   = -EINVAL;
347                 event = NULL;
348         } else {
349                 list_del(file->event_list.next);
350                 if (event->counter) {
351                         ++(*event->counter);
352                         list_del(&event->obj_list);
353                 }
354         }
355 
356         spin_unlock_irq(&file->lock);
357 
358         if (event) {
359                 if (copy_to_user(buf, event, eventsz))
360                         ret = -EFAULT;
361                 else
362                         ret = eventsz;
363         }
364 
365         kfree(event);
366 
367         return ret;
368 }
369 
370 static unsigned int ib_uverbs_event_poll(struct file *filp,
371                                          struct poll_table_struct *wait)
372 {
373         unsigned int pollflags = 0;
374         struct ib_uverbs_event_file *file = filp->private_data;
375 
376         poll_wait(filp, &file->poll_wait, wait);
377 
378         spin_lock_irq(&file->lock);
379         if (!list_empty(&file->event_list))
380                 pollflags = POLLIN | POLLRDNORM;
381         spin_unlock_irq(&file->lock);
382 
383         return pollflags;
384 }
385 
386 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
387 {
388         struct ib_uverbs_event_file *file = filp->private_data;
389 
390         return fasync_helper(fd, filp, on, &file->async_queue);
391 }
392 
393 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
394 {
395         struct ib_uverbs_event_file *file = filp->private_data;
396         struct ib_uverbs_event *entry, *tmp;
397 
398         spin_lock_irq(&file->lock);
399         file->is_closed = 1;
400         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
401                 if (entry->counter)
402                         list_del(&entry->obj_list);
403                 kfree(entry);
404         }
405         spin_unlock_irq(&file->lock);
406 
407         if (file->is_async) {
408                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
409                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
410         }
411         kref_put(&file->ref, ib_uverbs_release_event_file);
412 
413         return 0;
414 }
415 
416 static const struct file_operations uverbs_event_fops = {
417         .owner   = THIS_MODULE,
418         .read    = ib_uverbs_event_read,
419         .poll    = ib_uverbs_event_poll,
420         .release = ib_uverbs_event_close,
421         .fasync  = ib_uverbs_event_fasync,
422         .llseek  = no_llseek,
423 };
424 
425 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
426 {
427         struct ib_uverbs_event_file    *file = cq_context;
428         struct ib_ucq_object           *uobj;
429         struct ib_uverbs_event         *entry;
430         unsigned long                   flags;
431 
432         if (!file)
433                 return;
434 
435         spin_lock_irqsave(&file->lock, flags);
436         if (file->is_closed) {
437                 spin_unlock_irqrestore(&file->lock, flags);
438                 return;
439         }
440 
441         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
442         if (!entry) {
443                 spin_unlock_irqrestore(&file->lock, flags);
444                 return;
445         }
446 
447         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
448 
449         entry->desc.comp.cq_handle = cq->uobject->user_handle;
450         entry->counter             = &uobj->comp_events_reported;
451 
452         list_add_tail(&entry->list, &file->event_list);
453         list_add_tail(&entry->obj_list, &uobj->comp_list);
454         spin_unlock_irqrestore(&file->lock, flags);
455 
456         wake_up_interruptible(&file->poll_wait);
457         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
458 }
459 
460 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
461                                     __u64 element, __u64 event,
462                                     struct list_head *obj_list,
463                                     u32 *counter)
464 {
465         struct ib_uverbs_event *entry;
466         unsigned long flags;
467 
468         spin_lock_irqsave(&file->async_file->lock, flags);
469         if (file->async_file->is_closed) {
470                 spin_unlock_irqrestore(&file->async_file->lock, flags);
471                 return;
472         }
473 
474         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
475         if (!entry) {
476                 spin_unlock_irqrestore(&file->async_file->lock, flags);
477                 return;
478         }
479 
480         entry->desc.async.element    = element;
481         entry->desc.async.event_type = event;
482         entry->desc.async.reserved   = 0;
483         entry->counter               = counter;
484 
485         list_add_tail(&entry->list, &file->async_file->event_list);
486         if (obj_list)
487                 list_add_tail(&entry->obj_list, obj_list);
488         spin_unlock_irqrestore(&file->async_file->lock, flags);
489 
490         wake_up_interruptible(&file->async_file->poll_wait);
491         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
492 }
493 
494 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
495 {
496         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
497                                                   struct ib_ucq_object, uobject);
498 
499         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
500                                 event->event, &uobj->async_list,
501                                 &uobj->async_events_reported);
502 }
503 
504 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
505 {
506         struct ib_uevent_object *uobj;
507 
508         /* for XRC target qp's, check that qp is live */
509         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
510                 return;
511 
512         uobj = container_of(event->element.qp->uobject,
513                             struct ib_uevent_object, uobject);
514 
515         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
516                                 event->event, &uobj->event_list,
517                                 &uobj->events_reported);
518 }
519 
520 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
521 {
522         struct ib_uevent_object *uobj;
523 
524         uobj = container_of(event->element.srq->uobject,
525                             struct ib_uevent_object, uobject);
526 
527         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
528                                 event->event, &uobj->event_list,
529                                 &uobj->events_reported);
530 }
531 
532 void ib_uverbs_event_handler(struct ib_event_handler *handler,
533                              struct ib_event *event)
534 {
535         struct ib_uverbs_file *file =
536                 container_of(handler, struct ib_uverbs_file, event_handler);
537 
538         ib_uverbs_async_handler(file, event->element.port_num, event->event,
539                                 NULL, NULL);
540 }
541 
542 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
543                                         int is_async)
544 {
545         struct ib_uverbs_event_file *ev_file;
546         struct file *filp;
547 
548         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
549         if (!ev_file)
550                 return ERR_PTR(-ENOMEM);
551 
552         kref_init(&ev_file->ref);
553         spin_lock_init(&ev_file->lock);
554         INIT_LIST_HEAD(&ev_file->event_list);
555         init_waitqueue_head(&ev_file->poll_wait);
556         ev_file->uverbs_file = uverbs_file;
557         ev_file->async_queue = NULL;
558         ev_file->is_async    = is_async;
559         ev_file->is_closed   = 0;
560 
561         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
562                                   ev_file, O_RDONLY);
563         if (IS_ERR(filp))
564                 kfree(ev_file);
565 
566         return filp;
567 }
568 
569 /*
570  * Look up a completion event file by FD.  If lookup is successful,
571  * takes a ref to the event file struct that it returns; if
572  * unsuccessful, returns NULL.
573  */
574 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
575 {
576         struct ib_uverbs_event_file *ev_file = NULL;
577         struct fd f = fdget(fd);
578 
579         if (!f.file)
580                 return NULL;
581 
582         if (f.file->f_op != &uverbs_event_fops)
583                 goto out;
584 
585         ev_file = f.file->private_data;
586         if (ev_file->is_async) {
587                 ev_file = NULL;
588                 goto out;
589         }
590 
591         kref_get(&ev_file->ref);
592 
593 out:
594         fdput(f);
595         return ev_file;
596 }
597 
598 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
599                              size_t count, loff_t *pos)
600 {
601         struct ib_uverbs_file *file = filp->private_data;
602         struct ib_uverbs_cmd_hdr hdr;
603         __u32 flags;
604 
605         if (count < sizeof hdr)
606                 return -EINVAL;
607 
608         if (copy_from_user(&hdr, buf, sizeof hdr))
609                 return -EFAULT;
610 
611         flags = (hdr.command &
612                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
613 
614         if (!flags) {
615                 __u32 command;
616 
617                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
618                                            IB_USER_VERBS_CMD_COMMAND_MASK))
619                         return -EINVAL;
620 
621                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
622 
623                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
624                     !uverbs_cmd_table[command])
625                         return -EINVAL;
626 
627                 if (!file->ucontext &&
628                     command != IB_USER_VERBS_CMD_GET_CONTEXT)
629                         return -EINVAL;
630 
631                 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
632                         return -ENOSYS;
633 
634                 if (hdr.in_words * 4 != count)
635                         return -EINVAL;
636 
637                 return uverbs_cmd_table[command](file,
638                                                  buf + sizeof(hdr),
639                                                  hdr.in_words * 4,
640                                                  hdr.out_words * 4);
641 
642         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
643                 __u32 command;
644 
645                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
646                 struct ib_udata ucore;
647                 struct ib_udata uhw;
648                 int err;
649                 size_t written_count = count;
650 
651                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
652                                            IB_USER_VERBS_CMD_COMMAND_MASK))
653                         return -EINVAL;
654 
655                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
656 
657                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
658                     !uverbs_ex_cmd_table[command])
659                         return -ENOSYS;
660 
661                 if (!file->ucontext)
662                         return -EINVAL;
663 
664                 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
665                         return -ENOSYS;
666 
667                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
668                         return -EINVAL;
669 
670                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
671                         return -EFAULT;
672 
673                 count -= sizeof(hdr) + sizeof(ex_hdr);
674                 buf += sizeof(hdr) + sizeof(ex_hdr);
675 
676                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
677                         return -EINVAL;
678 
679                 if (ex_hdr.cmd_hdr_reserved)
680                         return -EINVAL;
681 
682                 if (ex_hdr.response) {
683                         if (!hdr.out_words && !ex_hdr.provider_out_words)
684                                 return -EINVAL;
685 
686                         if (!access_ok(VERIFY_WRITE,
687                                        (void __user *) (unsigned long) ex_hdr.response,
688                                        (hdr.out_words + ex_hdr.provider_out_words) * 8))
689                                 return -EFAULT;
690                 } else {
691                         if (hdr.out_words || ex_hdr.provider_out_words)
692                                 return -EINVAL;
693                 }
694 
695                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
696                                        hdr.in_words * 8, hdr.out_words * 8);
697 
698                 INIT_UDATA_BUF_OR_NULL(&uhw,
699                                        buf + ucore.inlen,
700                                        (unsigned long) ex_hdr.response + ucore.outlen,
701                                        ex_hdr.provider_in_words * 8,
702                                        ex_hdr.provider_out_words * 8);
703 
704                 err = uverbs_ex_cmd_table[command](file,
705                                                    &ucore,
706                                                    &uhw);
707 
708                 if (err)
709                         return err;
710 
711                 return written_count;
712         }
713 
714         return -ENOSYS;
715 }
716 
717 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
718 {
719         struct ib_uverbs_file *file = filp->private_data;
720 
721         if (!file->ucontext)
722                 return -ENODEV;
723         else
724                 return file->device->ib_dev->mmap(file->ucontext, vma);
725 }
726 
727 /*
728  * ib_uverbs_open() does not need the BKL:
729  *
730  *  - the ib_uverbs_device structures are properly reference counted and
731  *    everything else is purely local to the file being created, so
732  *    races against other open calls are not a problem;
733  *  - there is no ioctl method to race against;
734  *  - the open method will either immediately run -ENXIO, or all
735  *    required initialization will be done.
736  */
737 static int ib_uverbs_open(struct inode *inode, struct file *filp)
738 {
739         struct ib_uverbs_device *dev;
740         struct ib_uverbs_file *file;
741         int ret;
742 
743         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
744         if (dev)
745                 kref_get(&dev->ref);
746         else
747                 return -ENXIO;
748 
749         if (!try_module_get(dev->ib_dev->owner)) {
750                 ret = -ENODEV;
751                 goto err;
752         }
753 
754         file = kmalloc(sizeof *file, GFP_KERNEL);
755         if (!file) {
756                 ret = -ENOMEM;
757                 goto err_module;
758         }
759 
760         file->device     = dev;
761         file->ucontext   = NULL;
762         file->async_file = NULL;
763         kref_init(&file->ref);
764         mutex_init(&file->mutex);
765 
766         filp->private_data = file;
767 
768         return nonseekable_open(inode, filp);
769 
770 err_module:
771         module_put(dev->ib_dev->owner);
772 
773 err:
774         kref_put(&dev->ref, ib_uverbs_release_dev);
775         return ret;
776 }
777 
778 static int ib_uverbs_close(struct inode *inode, struct file *filp)
779 {
780         struct ib_uverbs_file *file = filp->private_data;
781 
782         ib_uverbs_cleanup_ucontext(file, file->ucontext);
783 
784         if (file->async_file)
785                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
786 
787         kref_put(&file->ref, ib_uverbs_release_file);
788 
789         return 0;
790 }
791 
792 static const struct file_operations uverbs_fops = {
793         .owner   = THIS_MODULE,
794         .write   = ib_uverbs_write,
795         .open    = ib_uverbs_open,
796         .release = ib_uverbs_close,
797         .llseek  = no_llseek,
798 };
799 
800 static const struct file_operations uverbs_mmap_fops = {
801         .owner   = THIS_MODULE,
802         .write   = ib_uverbs_write,
803         .mmap    = ib_uverbs_mmap,
804         .open    = ib_uverbs_open,
805         .release = ib_uverbs_close,
806         .llseek  = no_llseek,
807 };
808 
809 static struct ib_client uverbs_client = {
810         .name   = "uverbs",
811         .add    = ib_uverbs_add_one,
812         .remove = ib_uverbs_remove_one
813 };
814 
815 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
816                           char *buf)
817 {
818         struct ib_uverbs_device *dev = dev_get_drvdata(device);
819 
820         if (!dev)
821                 return -ENODEV;
822 
823         return sprintf(buf, "%s\n", dev->ib_dev->name);
824 }
825 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
826 
827 static ssize_t show_dev_abi_version(struct device *device,
828                                     struct device_attribute *attr, char *buf)
829 {
830         struct ib_uverbs_device *dev = dev_get_drvdata(device);
831 
832         if (!dev)
833                 return -ENODEV;
834 
835         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
836 }
837 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
838 
839 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
840                          __stringify(IB_USER_VERBS_ABI_VERSION));
841 
842 static dev_t overflow_maj;
843 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
844 
845 /*
846  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
847  * requesting a new major number and doubling the number of max devices we
848  * support. It's stupid, but simple.
849  */
850 static int find_overflow_devnum(void)
851 {
852         int ret;
853 
854         if (!overflow_maj) {
855                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
856                                           "infiniband_verbs");
857                 if (ret) {
858                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
859                         return ret;
860                 }
861         }
862 
863         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
864         if (ret >= IB_UVERBS_MAX_DEVICES)
865                 return -1;
866 
867         return ret;
868 }
869 
870 static void ib_uverbs_add_one(struct ib_device *device)
871 {
872         int devnum;
873         dev_t base;
874         struct ib_uverbs_device *uverbs_dev;
875 
876         if (!device->alloc_ucontext)
877                 return;
878 
879         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
880         if (!uverbs_dev)
881                 return;
882 
883         kref_init(&uverbs_dev->ref);
884         init_completion(&uverbs_dev->comp);
885         uverbs_dev->xrcd_tree = RB_ROOT;
886         mutex_init(&uverbs_dev->xrcd_tree_mutex);
887 
888         spin_lock(&map_lock);
889         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
890         if (devnum >= IB_UVERBS_MAX_DEVICES) {
891                 spin_unlock(&map_lock);
892                 devnum = find_overflow_devnum();
893                 if (devnum < 0)
894                         goto err;
895 
896                 spin_lock(&map_lock);
897                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
898                 base = devnum + overflow_maj;
899                 set_bit(devnum, overflow_map);
900         } else {
901                 uverbs_dev->devnum = devnum;
902                 base = devnum + IB_UVERBS_BASE_DEV;
903                 set_bit(devnum, dev_map);
904         }
905         spin_unlock(&map_lock);
906 
907         uverbs_dev->ib_dev           = device;
908         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
909 
910         cdev_init(&uverbs_dev->cdev, NULL);
911         uverbs_dev->cdev.owner = THIS_MODULE;
912         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
913         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
914         if (cdev_add(&uverbs_dev->cdev, base, 1))
915                 goto err_cdev;
916 
917         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
918                                         uverbs_dev->cdev.dev, uverbs_dev,
919                                         "uverbs%d", uverbs_dev->devnum);
920         if (IS_ERR(uverbs_dev->dev))
921                 goto err_cdev;
922 
923         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
924                 goto err_class;
925         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
926                 goto err_class;
927 
928         ib_set_client_data(device, &uverbs_client, uverbs_dev);
929 
930         return;
931 
932 err_class:
933         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
934 
935 err_cdev:
936         cdev_del(&uverbs_dev->cdev);
937         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
938                 clear_bit(devnum, dev_map);
939         else
940                 clear_bit(devnum, overflow_map);
941 
942 err:
943         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
944         wait_for_completion(&uverbs_dev->comp);
945         kfree(uverbs_dev);
946         return;
947 }
948 
949 static void ib_uverbs_remove_one(struct ib_device *device)
950 {
951         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
952 
953         if (!uverbs_dev)
954                 return;
955 
956         dev_set_drvdata(uverbs_dev->dev, NULL);
957         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
958         cdev_del(&uverbs_dev->cdev);
959 
960         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
961                 clear_bit(uverbs_dev->devnum, dev_map);
962         else
963                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
964 
965         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
966         wait_for_completion(&uverbs_dev->comp);
967         kfree(uverbs_dev);
968 }
969 
970 static char *uverbs_devnode(struct device *dev, umode_t *mode)
971 {
972         if (mode)
973                 *mode = 0666;
974         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
975 }
976 
977 static int __init ib_uverbs_init(void)
978 {
979         int ret;
980 
981         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
982                                      "infiniband_verbs");
983         if (ret) {
984                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
985                 goto out;
986         }
987 
988         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
989         if (IS_ERR(uverbs_class)) {
990                 ret = PTR_ERR(uverbs_class);
991                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
992                 goto out_chrdev;
993         }
994 
995         uverbs_class->devnode = uverbs_devnode;
996 
997         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
998         if (ret) {
999                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1000                 goto out_class;
1001         }
1002 
1003         ret = ib_register_client(&uverbs_client);
1004         if (ret) {
1005                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1006                 goto out_class;
1007         }
1008 
1009         return 0;
1010 
1011 out_class:
1012         class_destroy(uverbs_class);
1013 
1014 out_chrdev:
1015         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1016 
1017 out:
1018         return ret;
1019 }
1020 
1021 static void __exit ib_uverbs_cleanup(void)
1022 {
1023         ib_unregister_client(&uverbs_client);
1024         class_destroy(uverbs_class);
1025         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1026         if (overflow_maj)
1027                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1028         idr_destroy(&ib_uverbs_pd_idr);
1029         idr_destroy(&ib_uverbs_mr_idr);
1030         idr_destroy(&ib_uverbs_mw_idr);
1031         idr_destroy(&ib_uverbs_ah_idr);
1032         idr_destroy(&ib_uverbs_cq_idr);
1033         idr_destroy(&ib_uverbs_qp_idr);
1034         idr_destroy(&ib_uverbs_srq_idr);
1035 }
1036 
1037 module_init(ib_uverbs_init);
1038 module_exit(ib_uverbs_cleanup);
1039 

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