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Merge tag 'for_linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mst/vhost
[cris-mirror.git] / drivers / infiniband / core / uverbs_main.c
blobb1ca223aa3808425cb0b435c65478b7fce85371f
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 <linux/uaccess.h>
50
51 #include <rdma/ib.h>
52 #include <rdma/uverbs_std_types.h>
53
54 #include "uverbs.h"
55 #include "core_priv.h"
56 #include "rdma_core.h"
57
58 MODULE_AUTHOR("Roland Dreier");
59 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
60 MODULE_LICENSE("Dual BSD/GPL");
61
62 enum {
63 IB_UVERBS_MAJOR = 231,
64 IB_UVERBS_BASE_MINOR = 192,
65 IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
66 IB_UVERBS_NUM_FIXED_MINOR = 32,
67 IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
68 };
69
70 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
71
72 static dev_t dynamic_uverbs_dev;
73 static struct class *uverbs_class;
74
75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
76
77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
78 struct ib_device *ib_dev,
79 const char __user *buf, int in_len,
80 int out_len) = {
81 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
82 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
83 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
84 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
85 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
86 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
87 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr,
88 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
89 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
90 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
91 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
92 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
93 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
94 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
95 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
96 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
97 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
98 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
99 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
100 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
101 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
102 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
103 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
104 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
105 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
106 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
107 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
108 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
109 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
110 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
111 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
112 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
113 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
114 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
115 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
116 };
117
118 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
119 struct ib_device *ib_dev,
120 struct ib_udata *ucore,
121 struct ib_udata *uhw) = {
122 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
123 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
124 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device,
125 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq,
126 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp,
127 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq,
128 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq,
129 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq,
130 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
131 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
132 [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp,
133 [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq,
134 };
135
136 static void ib_uverbs_add_one(struct ib_device *device);
137 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
138
139 int uverbs_dealloc_mw(struct ib_mw *mw)
140 {
141 struct ib_pd *pd = mw->pd;
142 int ret;
143
144 ret = mw->device->dealloc_mw(mw);
145 if (!ret)
146 atomic_dec(&pd->usecnt);
147 return ret;
148 }
149
150 static void ib_uverbs_release_dev(struct kobject *kobj)
151 {
152 struct ib_uverbs_device *dev =
153 container_of(kobj, struct ib_uverbs_device, kobj);
154
155 cleanup_srcu_struct(&dev->disassociate_srcu);
156 kfree(dev);
157 }
158
159 static struct kobj_type ib_uverbs_dev_ktype = {
160 .release = ib_uverbs_release_dev,
161 };
162
163 static void ib_uverbs_release_async_event_file(struct kref *ref)
164 {
165 struct ib_uverbs_async_event_file *file =
166 container_of(ref, struct ib_uverbs_async_event_file, ref);
167
168 kfree(file);
169 }
170
171 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
172 struct ib_uverbs_completion_event_file *ev_file,
173 struct ib_ucq_object *uobj)
174 {
175 struct ib_uverbs_event *evt, *tmp;
176
177 if (ev_file) {
178 spin_lock_irq(&ev_file->ev_queue.lock);
179 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
180 list_del(&evt->list);
181 kfree(evt);
182 }
183 spin_unlock_irq(&ev_file->ev_queue.lock);
184
185 uverbs_uobject_put(&ev_file->uobj_file.uobj);
186 }
187
188 spin_lock_irq(&file->async_file->ev_queue.lock);
189 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
190 list_del(&evt->list);
191 kfree(evt);
192 }
193 spin_unlock_irq(&file->async_file->ev_queue.lock);
194 }
195
196 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
197 struct ib_uevent_object *uobj)
198 {
199 struct ib_uverbs_event *evt, *tmp;
200
201 spin_lock_irq(&file->async_file->ev_queue.lock);
202 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
203 list_del(&evt->list);
204 kfree(evt);
205 }
206 spin_unlock_irq(&file->async_file->ev_queue.lock);
207 }
208
209 void ib_uverbs_detach_umcast(struct ib_qp *qp,
210 struct ib_uqp_object *uobj)
211 {
212 struct ib_uverbs_mcast_entry *mcast, *tmp;
213
214 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
215 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
216 list_del(&mcast->list);
217 kfree(mcast);
218 }
219 }
220
221 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
222 struct ib_ucontext *context,
223 bool device_removed)
224 {
225 context->closing = 1;
226 uverbs_cleanup_ucontext(context, device_removed);
227 put_pid(context->tgid);
228
229 ib_rdmacg_uncharge(&context->cg_obj, context->device,
230 RDMACG_RESOURCE_HCA_HANDLE);
231
232 return context->device->dealloc_ucontext(context);
233 }
234
235 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
236 {
237 complete(&dev->comp);
238 }
239
240 void ib_uverbs_release_file(struct kref *ref)
241 {
242 struct ib_uverbs_file *file =
243 container_of(ref, struct ib_uverbs_file, ref);
244 struct ib_device *ib_dev;
245 int srcu_key;
246
247 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
248 ib_dev = srcu_dereference(file->device->ib_dev,
249 &file->device->disassociate_srcu);
250 if (ib_dev && !ib_dev->disassociate_ucontext)
251 module_put(ib_dev->owner);
252 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
253
254 if (atomic_dec_and_test(&file->device->refcount))
255 ib_uverbs_comp_dev(file->device);
256
257 kobject_put(&file->device->kobj);
258 kfree(file);
259 }
260
261 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
262 struct ib_uverbs_file *uverbs_file,
263 struct file *filp, char __user *buf,
264 size_t count, loff_t *pos,
265 size_t eventsz)
266 {
267 struct ib_uverbs_event *event;
268 int ret = 0;
269
270 spin_lock_irq(&ev_queue->lock);
271
272 while (list_empty(&ev_queue->event_list)) {
273 spin_unlock_irq(&ev_queue->lock);
274
275 if (filp->f_flags & O_NONBLOCK)
276 return -EAGAIN;
277
278 if (wait_event_interruptible(ev_queue->poll_wait,
279 (!list_empty(&ev_queue->event_list) ||
280 /* The barriers built into wait_event_interruptible()
281 * and wake_up() guarentee this will see the null set
282 * without using RCU
283 */
284 !uverbs_file->device->ib_dev)))
285 return -ERESTARTSYS;
286
287 /* If device was disassociated and no event exists set an error */
288 if (list_empty(&ev_queue->event_list) &&
289 !uverbs_file->device->ib_dev)
290 return -EIO;
291
292 spin_lock_irq(&ev_queue->lock);
293 }
294
295 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
296
297 if (eventsz > count) {
298 ret = -EINVAL;
299 event = NULL;
300 } else {
301 list_del(ev_queue->event_list.next);
302 if (event->counter) {
303 ++(*event->counter);
304 list_del(&event->obj_list);
305 }
306 }
307
308 spin_unlock_irq(&ev_queue->lock);
309
310 if (event) {
311 if (copy_to_user(buf, event, eventsz))
312 ret = -EFAULT;
313 else
314 ret = eventsz;
315 }
316
317 kfree(event);
318
319 return ret;
320 }
321
322 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
323 size_t count, loff_t *pos)
324 {
325 struct ib_uverbs_async_event_file *file = filp->private_data;
326
327 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
328 buf, count, pos,
329 sizeof(struct ib_uverbs_async_event_desc));
330 }
331
332 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
333 size_t count, loff_t *pos)
334 {
335 struct ib_uverbs_completion_event_file *comp_ev_file =
336 filp->private_data;
337
338 return ib_uverbs_event_read(&comp_ev_file->ev_queue,
339 comp_ev_file->uobj_file.ufile, filp,
340 buf, count, pos,
341 sizeof(struct ib_uverbs_comp_event_desc));
342 }
343
344 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
345 struct file *filp,
346 struct poll_table_struct *wait)
347 {
348 __poll_t pollflags = 0;
349
350 poll_wait(filp, &ev_queue->poll_wait, wait);
351
352 spin_lock_irq(&ev_queue->lock);
353 if (!list_empty(&ev_queue->event_list))
354 pollflags = EPOLLIN | EPOLLRDNORM;
355 spin_unlock_irq(&ev_queue->lock);
356
357 return pollflags;
358 }
359
360 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
361 struct poll_table_struct *wait)
362 {
363 return ib_uverbs_event_poll(filp->private_data, filp, wait);
364 }
365
366 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
367 struct poll_table_struct *wait)
368 {
369 struct ib_uverbs_completion_event_file *comp_ev_file =
370 filp->private_data;
371
372 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
373 }
374
375 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
376 {
377 struct ib_uverbs_event_queue *ev_queue = filp->private_data;
378
379 return fasync_helper(fd, filp, on, &ev_queue->async_queue);
380 }
381
382 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
383 {
384 struct ib_uverbs_completion_event_file *comp_ev_file =
385 filp->private_data;
386
387 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
388 }
389
390 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
391 {
392 struct ib_uverbs_async_event_file *file = filp->private_data;
393 struct ib_uverbs_file *uverbs_file = file->uverbs_file;
394 struct ib_uverbs_event *entry, *tmp;
395 int closed_already = 0;
396
397 mutex_lock(&uverbs_file->device->lists_mutex);
398 spin_lock_irq(&file->ev_queue.lock);
399 closed_already = file->ev_queue.is_closed;
400 file->ev_queue.is_closed = 1;
401 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
402 if (entry->counter)
403 list_del(&entry->obj_list);
404 kfree(entry);
405 }
406 spin_unlock_irq(&file->ev_queue.lock);
407 if (!closed_already) {
408 list_del(&file->list);
409 ib_unregister_event_handler(&uverbs_file->event_handler);
410 }
411 mutex_unlock(&uverbs_file->device->lists_mutex);
412
413 kref_put(&uverbs_file->ref, ib_uverbs_release_file);
414 kref_put(&file->ref, ib_uverbs_release_async_event_file);
415
416 return 0;
417 }
418
419 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
420 {
421 struct ib_uverbs_completion_event_file *file = filp->private_data;
422 struct ib_uverbs_event *entry, *tmp;
423
424 spin_lock_irq(&file->ev_queue.lock);
425 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
426 if (entry->counter)
427 list_del(&entry->obj_list);
428 kfree(entry);
429 }
430 spin_unlock_irq(&file->ev_queue.lock);
431
432 uverbs_close_fd(filp);
433
434 return 0;
435 }
436
437 const struct file_operations uverbs_event_fops = {
438 .owner = THIS_MODULE,
439 .read = ib_uverbs_comp_event_read,
440 .poll = ib_uverbs_comp_event_poll,
441 .release = ib_uverbs_comp_event_close,
442 .fasync = ib_uverbs_comp_event_fasync,
443 .llseek = no_llseek,
444 };
445
446 static const struct file_operations uverbs_async_event_fops = {
447 .owner = THIS_MODULE,
448 .read = ib_uverbs_async_event_read,
449 .poll = ib_uverbs_async_event_poll,
450 .release = ib_uverbs_async_event_close,
451 .fasync = ib_uverbs_async_event_fasync,
452 .llseek = no_llseek,
453 };
454
455 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
456 {
457 struct ib_uverbs_event_queue *ev_queue = cq_context;
458 struct ib_ucq_object *uobj;
459 struct ib_uverbs_event *entry;
460 unsigned long flags;
461
462 if (!ev_queue)
463 return;
464
465 spin_lock_irqsave(&ev_queue->lock, flags);
466 if (ev_queue->is_closed) {
467 spin_unlock_irqrestore(&ev_queue->lock, flags);
468 return;
469 }
470
471 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
472 if (!entry) {
473 spin_unlock_irqrestore(&ev_queue->lock, flags);
474 return;
475 }
476
477 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
478
479 entry->desc.comp.cq_handle = cq->uobject->user_handle;
480 entry->counter = &uobj->comp_events_reported;
481
482 list_add_tail(&entry->list, &ev_queue->event_list);
483 list_add_tail(&entry->obj_list, &uobj->comp_list);
484 spin_unlock_irqrestore(&ev_queue->lock, flags);
485
486 wake_up_interruptible(&ev_queue->poll_wait);
487 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
488 }
489
490 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
491 __u64 element, __u64 event,
492 struct list_head *obj_list,
493 u32 *counter)
494 {
495 struct ib_uverbs_event *entry;
496 unsigned long flags;
497
498 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
499 if (file->async_file->ev_queue.is_closed) {
500 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
501 return;
502 }
503
504 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
505 if (!entry) {
506 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
507 return;
508 }
509
510 entry->desc.async.element = element;
511 entry->desc.async.event_type = event;
512 entry->desc.async.reserved = 0;
513 entry->counter = counter;
514
515 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
516 if (obj_list)
517 list_add_tail(&entry->obj_list, obj_list);
518 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
519
520 wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
521 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
522 }
523
524 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
525 {
526 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
527 struct ib_ucq_object, uobject);
528
529 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
530 event->event, &uobj->async_list,
531 &uobj->async_events_reported);
532 }
533
534 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
535 {
536 struct ib_uevent_object *uobj;
537
538 /* for XRC target qp's, check that qp is live */
539 if (!event->element.qp->uobject)
540 return;
541
542 uobj = container_of(event->element.qp->uobject,
543 struct ib_uevent_object, uobject);
544
545 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
546 event->event, &uobj->event_list,
547 &uobj->events_reported);
548 }
549
550 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
551 {
552 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
553 struct ib_uevent_object, uobject);
554
555 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
556 event->event, &uobj->event_list,
557 &uobj->events_reported);
558 }
559
560 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
561 {
562 struct ib_uevent_object *uobj;
563
564 uobj = container_of(event->element.srq->uobject,
565 struct ib_uevent_object, uobject);
566
567 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
568 event->event, &uobj->event_list,
569 &uobj->events_reported);
570 }
571
572 void ib_uverbs_event_handler(struct ib_event_handler *handler,
573 struct ib_event *event)
574 {
575 struct ib_uverbs_file *file =
576 container_of(handler, struct ib_uverbs_file, event_handler);
577
578 ib_uverbs_async_handler(file, event->element.port_num, event->event,
579 NULL, NULL);
580 }
581
582 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
583 {
584 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
585 file->async_file = NULL;
586 }
587
588 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
589 {
590 spin_lock_init(&ev_queue->lock);
591 INIT_LIST_HEAD(&ev_queue->event_list);
592 init_waitqueue_head(&ev_queue->poll_wait);
593 ev_queue->is_closed = 0;
594 ev_queue->async_queue = NULL;
595 }
596
597 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
598 struct ib_device *ib_dev)
599 {
600 struct ib_uverbs_async_event_file *ev_file;
601 struct file *filp;
602
603 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
604 if (!ev_file)
605 return ERR_PTR(-ENOMEM);
606
607 ib_uverbs_init_event_queue(&ev_file->ev_queue);
608 ev_file->uverbs_file = uverbs_file;
609 kref_get(&ev_file->uverbs_file->ref);
610 kref_init(&ev_file->ref);
611 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
612 ev_file, O_RDONLY);
613 if (IS_ERR(filp))
614 goto err_put_refs;
615
616 mutex_lock(&uverbs_file->device->lists_mutex);
617 list_add_tail(&ev_file->list,
618 &uverbs_file->device->uverbs_events_file_list);
619 mutex_unlock(&uverbs_file->device->lists_mutex);
620
621 WARN_ON(uverbs_file->async_file);
622 uverbs_file->async_file = ev_file;
623 kref_get(&uverbs_file->async_file->ref);
624 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
625 ib_dev,
626 ib_uverbs_event_handler);
627 ib_register_event_handler(&uverbs_file->event_handler);
628 /* At that point async file stuff was fully set */
629
630 return filp;
631
632 err_put_refs:
633 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
634 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
635 return filp;
636 }
637
638 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
639 {
640 u64 mask;
641
642 if (command <= IB_USER_VERBS_CMD_OPEN_QP)
643 mask = ib_dev->uverbs_cmd_mask;
644 else
645 mask = ib_dev->uverbs_ex_cmd_mask;
646
647 if (mask & ((u64)1 << command))
648 return 0;
649
650 return -1;
651 }
652
653 static bool verify_command_idx(u32 command, bool extended)
654 {
655 if (extended)
656 return command < ARRAY_SIZE(uverbs_ex_cmd_table);
657
658 return command < ARRAY_SIZE(uverbs_cmd_table);
659 }
660
661 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
662 size_t count, loff_t *pos)
663 {
664 struct ib_uverbs_file *file = filp->private_data;
665 struct ib_device *ib_dev;
666 struct ib_uverbs_cmd_hdr hdr;
667 bool extended_command;
668 __u32 command;
669 __u32 flags;
670 int srcu_key;
671 ssize_t ret;
672
673 if (!ib_safe_file_access(filp)) {
674 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
675 task_tgid_vnr(current), current->comm);
676 return -EACCES;
677 }
678
679 if (count < sizeof hdr)
680 return -EINVAL;
681
682 if (copy_from_user(&hdr, buf, sizeof hdr))
683 return -EFAULT;
684
685 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
686 ib_dev = srcu_dereference(file->device->ib_dev,
687 &file->device->disassociate_srcu);
688 if (!ib_dev) {
689 ret = -EIO;
690 goto out;
691 }
692
693 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
694 IB_USER_VERBS_CMD_COMMAND_MASK)) {
695 ret = -EINVAL;
696 goto out;
697 }
698
699 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
700 flags = (hdr.command &
701 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
702
703 extended_command = flags & IB_USER_VERBS_CMD_FLAG_EXTENDED;
704 if (!verify_command_idx(command, extended_command)) {
705 ret = -EINVAL;
706 goto out;
707 }
708
709 if (verify_command_mask(ib_dev, command)) {
710 ret = -EOPNOTSUPP;
711 goto out;
712 }
713
714 if (!file->ucontext &&
715 command != IB_USER_VERBS_CMD_GET_CONTEXT) {
716 ret = -EINVAL;
717 goto out;
718 }
719
720 if (!flags) {
721 if (!uverbs_cmd_table[command]) {
722 ret = -EINVAL;
723 goto out;
724 }
725
726 if (hdr.in_words * 4 != count) {
727 ret = -EINVAL;
728 goto out;
729 }
730
731 ret = uverbs_cmd_table[command](file, ib_dev,
732 buf + sizeof(hdr),
733 hdr.in_words * 4,
734 hdr.out_words * 4);
735
736 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
737 struct ib_uverbs_ex_cmd_hdr ex_hdr;
738 struct ib_udata ucore;
739 struct ib_udata uhw;
740 size_t written_count = count;
741
742 if (!uverbs_ex_cmd_table[command]) {
743 ret = -ENOSYS;
744 goto out;
745 }
746
747 if (!file->ucontext) {
748 ret = -EINVAL;
749 goto out;
750 }
751
752 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
753 ret = -EINVAL;
754 goto out;
755 }
756
757 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
758 ret = -EFAULT;
759 goto out;
760 }
761
762 count -= sizeof(hdr) + sizeof(ex_hdr);
763 buf += sizeof(hdr) + sizeof(ex_hdr);
764
765 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
766 ret = -EINVAL;
767 goto out;
768 }
769
770 if (ex_hdr.cmd_hdr_reserved) {
771 ret = -EINVAL;
772 goto out;
773 }
774
775 if (ex_hdr.response) {
776 if (!hdr.out_words && !ex_hdr.provider_out_words) {
777 ret = -EINVAL;
778 goto out;
779 }
780
781 if (!access_ok(VERIFY_WRITE,
782 u64_to_user_ptr(ex_hdr.response),
783 (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
784 ret = -EFAULT;
785 goto out;
786 }
787 } else {
788 if (hdr.out_words || ex_hdr.provider_out_words) {
789 ret = -EINVAL;
790 goto out;
791 }
792 }
793
794 ib_uverbs_init_udata_buf_or_null(&ucore, buf,
795 u64_to_user_ptr(ex_hdr.response),
796 hdr.in_words * 8, hdr.out_words * 8);
797
798 ib_uverbs_init_udata_buf_or_null(&uhw,
799 buf + ucore.inlen,
800 u64_to_user_ptr(ex_hdr.response) + ucore.outlen,
801 ex_hdr.provider_in_words * 8,
802 ex_hdr.provider_out_words * 8);
803
804 ret = uverbs_ex_cmd_table[command](file, ib_dev, &ucore, &uhw);
805 if (!ret)
806 ret = written_count;
807 } else {
808 ret = -ENOSYS;
809 }
810
811 out:
812 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
813 return ret;
814 }
815
816 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
817 {
818 struct ib_uverbs_file *file = filp->private_data;
819 struct ib_device *ib_dev;
820 int ret = 0;
821 int srcu_key;
822
823 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
824 ib_dev = srcu_dereference(file->device->ib_dev,
825 &file->device->disassociate_srcu);
826 if (!ib_dev) {
827 ret = -EIO;
828 goto out;
829 }
830
831 if (!file->ucontext)
832 ret = -ENODEV;
833 else
834 ret = ib_dev->mmap(file->ucontext, vma);
835 out:
836 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
837 return ret;
838 }
839
840 /*
841 * ib_uverbs_open() does not need the BKL:
842 *
843 * - the ib_uverbs_device structures are properly reference counted and
844 * everything else is purely local to the file being created, so
845 * races against other open calls are not a problem;
846 * - there is no ioctl method to race against;
847 * - the open method will either immediately run -ENXIO, or all
848 * required initialization will be done.
849 */
850 static int ib_uverbs_open(struct inode *inode, struct file *filp)
851 {
852 struct ib_uverbs_device *dev;
853 struct ib_uverbs_file *file;
854 struct ib_device *ib_dev;
855 int ret;
856 int module_dependent;
857 int srcu_key;
858
859 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
860 if (!atomic_inc_not_zero(&dev->refcount))
861 return -ENXIO;
862
863 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
864 mutex_lock(&dev->lists_mutex);
865 ib_dev = srcu_dereference(dev->ib_dev,
866 &dev->disassociate_srcu);
867 if (!ib_dev) {
868 ret = -EIO;
869 goto err;
870 }
871
872 /* In case IB device supports disassociate ucontext, there is no hard
873 * dependency between uverbs device and its low level device.
874 */
875 module_dependent = !(ib_dev->disassociate_ucontext);
876
877 if (module_dependent) {
878 if (!try_module_get(ib_dev->owner)) {
879 ret = -ENODEV;
880 goto err;
881 }
882 }
883
884 file = kzalloc(sizeof(*file), GFP_KERNEL);
885 if (!file) {
886 ret = -ENOMEM;
887 if (module_dependent)
888 goto err_module;
889
890 goto err;
891 }
892
893 file->device = dev;
894 spin_lock_init(&file->idr_lock);
895 idr_init(&file->idr);
896 file->ucontext = NULL;
897 file->async_file = NULL;
898 kref_init(&file->ref);
899 mutex_init(&file->mutex);
900 mutex_init(&file->cleanup_mutex);
901
902 filp->private_data = file;
903 kobject_get(&dev->kobj);
904 list_add_tail(&file->list, &dev->uverbs_file_list);
905 mutex_unlock(&dev->lists_mutex);
906 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
907
908 return nonseekable_open(inode, filp);
909
910 err_module:
911 module_put(ib_dev->owner);
912
913 err:
914 mutex_unlock(&dev->lists_mutex);
915 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
916 if (atomic_dec_and_test(&dev->refcount))
917 ib_uverbs_comp_dev(dev);
918
919 return ret;
920 }
921
922 static int ib_uverbs_close(struct inode *inode, struct file *filp)
923 {
924 struct ib_uverbs_file *file = filp->private_data;
925
926 mutex_lock(&file->cleanup_mutex);
927 if (file->ucontext) {
928 ib_uverbs_cleanup_ucontext(file, file->ucontext, false);
929 file->ucontext = NULL;
930 }
931 mutex_unlock(&file->cleanup_mutex);
932 idr_destroy(&file->idr);
933
934 mutex_lock(&file->device->lists_mutex);
935 if (!file->is_closed) {
936 list_del(&file->list);
937 file->is_closed = 1;
938 }
939 mutex_unlock(&file->device->lists_mutex);
940
941 if (file->async_file)
942 kref_put(&file->async_file->ref,
943 ib_uverbs_release_async_event_file);
944
945 kref_put(&file->ref, ib_uverbs_release_file);
946
947 return 0;
948 }
949
950 static const struct file_operations uverbs_fops = {
951 .owner = THIS_MODULE,
952 .write = ib_uverbs_write,
953 .open = ib_uverbs_open,
954 .release = ib_uverbs_close,
955 .llseek = no_llseek,
956 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
957 .unlocked_ioctl = ib_uverbs_ioctl,
958 .compat_ioctl = ib_uverbs_ioctl,
959 #endif
960 };
961
962 static const struct file_operations uverbs_mmap_fops = {
963 .owner = THIS_MODULE,
964 .write = ib_uverbs_write,
965 .mmap = ib_uverbs_mmap,
966 .open = ib_uverbs_open,
967 .release = ib_uverbs_close,
968 .llseek = no_llseek,
969 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
970 .unlocked_ioctl = ib_uverbs_ioctl,
971 .compat_ioctl = ib_uverbs_ioctl,
972 #endif
973 };
974
975 static struct ib_client uverbs_client = {
976 .name = "uverbs",
977 .add = ib_uverbs_add_one,
978 .remove = ib_uverbs_remove_one
979 };
980
981 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
982 char *buf)
983 {
984 int ret = -ENODEV;
985 int srcu_key;
986 struct ib_uverbs_device *dev = dev_get_drvdata(device);
987 struct ib_device *ib_dev;
988
989 if (!dev)
990 return -ENODEV;
991
992 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
993 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
994 if (ib_dev)
995 ret = sprintf(buf, "%s\n", ib_dev->name);
996 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
997
998 return ret;
999 }
1000 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1001
1002 static ssize_t show_dev_abi_version(struct device *device,
1003 struct device_attribute *attr, char *buf)
1004 {
1005 struct ib_uverbs_device *dev = dev_get_drvdata(device);
1006 int ret = -ENODEV;
1007 int srcu_key;
1008 struct ib_device *ib_dev;
1009
1010 if (!dev)
1011 return -ENODEV;
1012 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1013 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1014 if (ib_dev)
1015 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1016 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1017
1018 return ret;
1019 }
1020 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1021
1022 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1023 __stringify(IB_USER_VERBS_ABI_VERSION));
1024
1025 static void ib_uverbs_add_one(struct ib_device *device)
1026 {
1027 int devnum;
1028 dev_t base;
1029 struct ib_uverbs_device *uverbs_dev;
1030 int ret;
1031
1032 if (!device->alloc_ucontext)
1033 return;
1034
1035 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1036 if (!uverbs_dev)
1037 return;
1038
1039 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1040 if (ret) {
1041 kfree(uverbs_dev);
1042 return;
1043 }
1044
1045 atomic_set(&uverbs_dev->refcount, 1);
1046 init_completion(&uverbs_dev->comp);
1047 uverbs_dev->xrcd_tree = RB_ROOT;
1048 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1049 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1050 mutex_init(&uverbs_dev->lists_mutex);
1051 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1052 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1053
1054 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1055 if (devnum >= IB_UVERBS_MAX_DEVICES)
1056 goto err;
1057 uverbs_dev->devnum = devnum;
1058 set_bit(devnum, dev_map);
1059 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1060 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1061 else
1062 base = IB_UVERBS_BASE_DEV + devnum;
1063
1064 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1065 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1066
1067 cdev_init(&uverbs_dev->cdev, NULL);
1068 uverbs_dev->cdev.owner = THIS_MODULE;
1069 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1070 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1071 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1072 if (cdev_add(&uverbs_dev->cdev, base, 1))
1073 goto err_cdev;
1074
1075 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1076 uverbs_dev->cdev.dev, uverbs_dev,
1077 "uverbs%d", uverbs_dev->devnum);
1078 if (IS_ERR(uverbs_dev->dev))
1079 goto err_cdev;
1080
1081 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1082 goto err_class;
1083 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1084 goto err_class;
1085
1086 if (!device->specs_root) {
1087 const struct uverbs_object_tree_def *default_root[] = {
1088 uverbs_default_get_objects()};
1089
1090 uverbs_dev->specs_root = uverbs_alloc_spec_tree(1,
1091 default_root);
1092 if (IS_ERR(uverbs_dev->specs_root))
1093 goto err_class;
1094
1095 device->specs_root = uverbs_dev->specs_root;
1096 }
1097
1098 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1099
1100 return;
1101
1102 err_class:
1103 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1104
1105 err_cdev:
1106 cdev_del(&uverbs_dev->cdev);
1107 clear_bit(devnum, dev_map);
1108
1109 err:
1110 if (atomic_dec_and_test(&uverbs_dev->refcount))
1111 ib_uverbs_comp_dev(uverbs_dev);
1112 wait_for_completion(&uverbs_dev->comp);
1113 kobject_put(&uverbs_dev->kobj);
1114 return;
1115 }
1116
1117 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1118 struct ib_device *ib_dev)
1119 {
1120 struct ib_uverbs_file *file;
1121 struct ib_uverbs_async_event_file *event_file;
1122 struct ib_event event;
1123
1124 /* Pending running commands to terminate */
1125 synchronize_srcu(&uverbs_dev->disassociate_srcu);
1126 event.event = IB_EVENT_DEVICE_FATAL;
1127 event.element.port_num = 0;
1128 event.device = ib_dev;
1129
1130 mutex_lock(&uverbs_dev->lists_mutex);
1131 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1132 struct ib_ucontext *ucontext;
1133 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1134 struct ib_uverbs_file, list);
1135 file->is_closed = 1;
1136 list_del(&file->list);
1137 kref_get(&file->ref);
1138 mutex_unlock(&uverbs_dev->lists_mutex);
1139
1140
1141 mutex_lock(&file->cleanup_mutex);
1142 ucontext = file->ucontext;
1143 file->ucontext = NULL;
1144 mutex_unlock(&file->cleanup_mutex);
1145
1146 /* At this point ib_uverbs_close cannot be running
1147 * ib_uverbs_cleanup_ucontext
1148 */
1149 if (ucontext) {
1150 /* We must release the mutex before going ahead and
1151 * calling disassociate_ucontext. disassociate_ucontext
1152 * might end up indirectly calling uverbs_close,
1153 * for example due to freeing the resources
1154 * (e.g mmput).
1155 */
1156 ib_uverbs_event_handler(&file->event_handler, &event);
1157 ib_dev->disassociate_ucontext(ucontext);
1158 mutex_lock(&file->cleanup_mutex);
1159 ib_uverbs_cleanup_ucontext(file, ucontext, true);
1160 mutex_unlock(&file->cleanup_mutex);
1161 }
1162
1163 mutex_lock(&uverbs_dev->lists_mutex);
1164 kref_put(&file->ref, ib_uverbs_release_file);
1165 }
1166
1167 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1168 event_file = list_first_entry(&uverbs_dev->
1169 uverbs_events_file_list,
1170 struct ib_uverbs_async_event_file,
1171 list);
1172 spin_lock_irq(&event_file->ev_queue.lock);
1173 event_file->ev_queue.is_closed = 1;
1174 spin_unlock_irq(&event_file->ev_queue.lock);
1175
1176 list_del(&event_file->list);
1177 ib_unregister_event_handler(
1178 &event_file->uverbs_file->event_handler);
1179 event_file->uverbs_file->event_handler.device =
1180 NULL;
1181
1182 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1183 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1184 }
1185 mutex_unlock(&uverbs_dev->lists_mutex);
1186 }
1187
1188 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1189 {
1190 struct ib_uverbs_device *uverbs_dev = client_data;
1191 int wait_clients = 1;
1192
1193 if (!uverbs_dev)
1194 return;
1195
1196 dev_set_drvdata(uverbs_dev->dev, NULL);
1197 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1198 cdev_del(&uverbs_dev->cdev);
1199 clear_bit(uverbs_dev->devnum, dev_map);
1200
1201 if (device->disassociate_ucontext) {
1202 /* We disassociate HW resources and immediately return.
1203 * Userspace will see a EIO errno for all future access.
1204 * Upon returning, ib_device may be freed internally and is not
1205 * valid any more.
1206 * uverbs_device is still available until all clients close
1207 * their files, then the uverbs device ref count will be zero
1208 * and its resources will be freed.
1209 * Note: At this point no more files can be opened since the
1210 * cdev was deleted, however active clients can still issue
1211 * commands and close their open files.
1212 */
1213 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1214 ib_uverbs_free_hw_resources(uverbs_dev, device);
1215 wait_clients = 0;
1216 }
1217
1218 if (atomic_dec_and_test(&uverbs_dev->refcount))
1219 ib_uverbs_comp_dev(uverbs_dev);
1220 if (wait_clients)
1221 wait_for_completion(&uverbs_dev->comp);
1222 if (uverbs_dev->specs_root) {
1223 uverbs_free_spec_tree(uverbs_dev->specs_root);
1224 device->specs_root = NULL;
1225 }
1226
1227 kobject_put(&uverbs_dev->kobj);
1228 }
1229
1230 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1231 {
1232 if (mode)
1233 *mode = 0666;
1234 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1235 }
1236
1237 static int __init ib_uverbs_init(void)
1238 {
1239 int ret;
1240
1241 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1242 IB_UVERBS_NUM_FIXED_MINOR,
1243 "infiniband_verbs");
1244 if (ret) {
1245 pr_err("user_verbs: couldn't register device number\n");
1246 goto out;
1247 }
1248
1249 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1250 IB_UVERBS_NUM_DYNAMIC_MINOR,
1251 "infiniband_verbs");
1252 if (ret) {
1253 pr_err("couldn't register dynamic device number\n");
1254 goto out_alloc;
1255 }
1256
1257 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1258 if (IS_ERR(uverbs_class)) {
1259 ret = PTR_ERR(uverbs_class);
1260 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1261 goto out_chrdev;
1262 }
1263
1264 uverbs_class->devnode = uverbs_devnode;
1265
1266 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1267 if (ret) {
1268 pr_err("user_verbs: couldn't create abi_version attribute\n");
1269 goto out_class;
1270 }
1271
1272 ret = ib_register_client(&uverbs_client);
1273 if (ret) {
1274 pr_err("user_verbs: couldn't register client\n");
1275 goto out_class;
1276 }
1277
1278 return 0;
1279
1280 out_class:
1281 class_destroy(uverbs_class);
1282
1283 out_chrdev:
1284 unregister_chrdev_region(dynamic_uverbs_dev,
1285 IB_UVERBS_NUM_DYNAMIC_MINOR);
1286
1287 out_alloc:
1288 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1289 IB_UVERBS_NUM_FIXED_MINOR);
1290
1291 out:
1292 return ret;
1293 }
1294
1295 static void __exit ib_uverbs_cleanup(void)
1296 {
1297 ib_unregister_client(&uverbs_client);
1298 class_destroy(uverbs_class);
1299 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1300 IB_UVERBS_NUM_FIXED_MINOR);
1301 unregister_chrdev_region(dynamic_uverbs_dev,
1302 IB_UVERBS_NUM_DYNAMIC_MINOR);
1303 }
1304
1305 module_init(ib_uverbs_init);
1306 module_exit(ib_uverbs_cleanup);
CRIS linux kernel tree