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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
53MODULE_AUTHOR("Roland Dreier");
54MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55MODULE_LICENSE("Dual BSD/GPL");
56
57enum {
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
65static struct class *uverbs_class;
66
67DEFINE_SPINLOCK(ib_uverbs_idr_lock);
68DEFINE_IDR(ib_uverbs_pd_idr);
69DEFINE_IDR(ib_uverbs_mr_idr);
70DEFINE_IDR(ib_uverbs_mw_idr);
71DEFINE_IDR(ib_uverbs_ah_idr);
72DEFINE_IDR(ib_uverbs_cq_idr);
73DEFINE_IDR(ib_uverbs_qp_idr);
74DEFINE_IDR(ib_uverbs_srq_idr);
75
76static DEFINE_SPINLOCK(map_lock);
77static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
78
79static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
80 const char __user *buf, int in_len,
81 int out_len) = {
82 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
83 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
84 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
85 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
86 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
87 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
88 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
89 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
90 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
91 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
92 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
93 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
94 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
95 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
96 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
97 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
98 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
99 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
100 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
101 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
102 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
103 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
104 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
105 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
106 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
107 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
108 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
109 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
110};
111
112static void ib_uverbs_add_one(struct ib_device *device);
113static void ib_uverbs_remove_one(struct ib_device *device);
114
115static void ib_uverbs_release_dev(struct kref *ref)
116{
117 struct ib_uverbs_device *dev =
118 container_of(ref, struct ib_uverbs_device, ref);
119
120 complete(&dev->comp);
121}
122
123static void ib_uverbs_release_event_file(struct kref *ref)
124{
125 struct ib_uverbs_event_file *file =
126 container_of(ref, struct ib_uverbs_event_file, ref);
127
128 kfree(file);
129}
130
131void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
132 struct ib_uverbs_event_file *ev_file,
133 struct ib_ucq_object *uobj)
134{
135 struct ib_uverbs_event *evt, *tmp;
136
137 if (ev_file) {
138 spin_lock_irq(&ev_file->lock);
139 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
140 list_del(&evt->list);
141 kfree(evt);
142 }
143 spin_unlock_irq(&ev_file->lock);
144
145 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
146 }
147
148 spin_lock_irq(&file->async_file->lock);
149 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
150 list_del(&evt->list);
151 kfree(evt);
152 }
153 spin_unlock_irq(&file->async_file->lock);
154}
155
156void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
157 struct ib_uevent_object *uobj)
158{
159 struct ib_uverbs_event *evt, *tmp;
160
161 spin_lock_irq(&file->async_file->lock);
162 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
163 list_del(&evt->list);
164 kfree(evt);
165 }
166 spin_unlock_irq(&file->async_file->lock);
167}
168
169static void ib_uverbs_detach_umcast(struct ib_qp *qp,
170 struct ib_uqp_object *uobj)
171{
172 struct ib_uverbs_mcast_entry *mcast, *tmp;
173
174 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
175 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
176 list_del(&mcast->list);
177 kfree(mcast);
178 }
179}
180
181static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
182 struct ib_ucontext *context)
183{
184 struct ib_uobject *uobj, *tmp;
185
186 if (!context)
187 return 0;
188
189 context->closing = 1;
190
191 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
192 struct ib_ah *ah = uobj->object;
193
194 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
195 ib_destroy_ah(ah);
196 kfree(uobj);
197 }
198
199 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
200 struct ib_qp *qp = uobj->object;
201 struct ib_uqp_object *uqp =
202 container_of(uobj, struct ib_uqp_object, uevent.uobject);
203
204 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
205 ib_uverbs_detach_umcast(qp, uqp);
206 ib_destroy_qp(qp);
207 ib_uverbs_release_uevent(file, &uqp->uevent);
208 kfree(uqp);
209 }
210
211 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
212 struct ib_cq *cq = uobj->object;
213 struct ib_uverbs_event_file *ev_file = cq->cq_context;
214 struct ib_ucq_object *ucq =
215 container_of(uobj, struct ib_ucq_object, uobject);
216
217 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
218 ib_destroy_cq(cq);
219 ib_uverbs_release_ucq(file, ev_file, ucq);
220 kfree(ucq);
221 }
222
223 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
224 struct ib_srq *srq = uobj->object;
225 struct ib_uevent_object *uevent =
226 container_of(uobj, struct ib_uevent_object, uobject);
227
228 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
229 ib_destroy_srq(srq);
230 ib_uverbs_release_uevent(file, uevent);
231 kfree(uevent);
232 }
233
234 /* XXX Free MWs */
235
236 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
237 struct ib_mr *mr = uobj->object;
238
239 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
240 ib_dereg_mr(mr);
241 kfree(uobj);
242 }
243
244 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
245 struct ib_pd *pd = uobj->object;
246
247 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
248 ib_dealloc_pd(pd);
249 kfree(uobj);
250 }
251
252 return context->device->dealloc_ucontext(context);
253}
254
255static void ib_uverbs_release_file(struct kref *ref)
256{
257 struct ib_uverbs_file *file =
258 container_of(ref, struct ib_uverbs_file, ref);
259
260 module_put(file->device->ib_dev->owner);
261 kref_put(&file->device->ref, ib_uverbs_release_dev);
262
263 kfree(file);
264}
265
266static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
267 size_t count, loff_t *pos)
268{
269 struct ib_uverbs_event_file *file = filp->private_data;
270 struct ib_uverbs_event *event;
271 int eventsz;
272 int ret = 0;
273
274 spin_lock_irq(&file->lock);
275
276 while (list_empty(&file->event_list)) {
277 spin_unlock_irq(&file->lock);
278
279 if (filp->f_flags & O_NONBLOCK)
280 return -EAGAIN;
281
282 if (wait_event_interruptible(file->poll_wait,
283 !list_empty(&file->event_list)))
284 return -ERESTARTSYS;
285
286 spin_lock_irq(&file->lock);
287 }
288
289 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
290
291 if (file->is_async)
292 eventsz = sizeof (struct ib_uverbs_async_event_desc);
293 else
294 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
295
296 if (eventsz > count) {
297 ret = -EINVAL;
298 event = NULL;
299 } else {
300 list_del(file->event_list.next);
301 if (event->counter) {
302 ++(*event->counter);
303 list_del(&event->obj_list);
304 }
305 }
306
307 spin_unlock_irq(&file->lock);
308
309 if (event) {
310 if (copy_to_user(buf, event, eventsz))
311 ret = -EFAULT;
312 else
313 ret = eventsz;
314 }
315
316 kfree(event);
317
318 return ret;
319}
320
321static unsigned int ib_uverbs_event_poll(struct file *filp,
322 struct poll_table_struct *wait)
323{
324 unsigned int pollflags = 0;
325 struct ib_uverbs_event_file *file = filp->private_data;
326
327 poll_wait(filp, &file->poll_wait, wait);
328
329 spin_lock_irq(&file->lock);
330 if (!list_empty(&file->event_list))
331 pollflags = POLLIN | POLLRDNORM;
332 spin_unlock_irq(&file->lock);
333
334 return pollflags;
335}
336
337static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
338{
339 struct ib_uverbs_event_file *file = filp->private_data;
340
341 return fasync_helper(fd, filp, on, &file->async_queue);
342}
343
344static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
345{
346 struct ib_uverbs_event_file *file = filp->private_data;
347 struct ib_uverbs_event *entry, *tmp;
348
349 spin_lock_irq(&file->lock);
350 file->is_closed = 1;
351 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
352 if (entry->counter)
353 list_del(&entry->obj_list);
354 kfree(entry);
355 }
356 spin_unlock_irq(&file->lock);
357
358 if (file->is_async) {
359 ib_unregister_event_handler(&file->uverbs_file->event_handler);
360 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
361 }
362 kref_put(&file->ref, ib_uverbs_release_event_file);
363
364 return 0;
365}
366
367static const struct file_operations uverbs_event_fops = {
368 .owner = THIS_MODULE,
369 .read = ib_uverbs_event_read,
370 .poll = ib_uverbs_event_poll,
371 .release = ib_uverbs_event_close,
372 .fasync = ib_uverbs_event_fasync,
373 .llseek = no_llseek,
374};
375
376void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
377{
378 struct ib_uverbs_event_file *file = cq_context;
379 struct ib_ucq_object *uobj;
380 struct ib_uverbs_event *entry;
381 unsigned long flags;
382
383 if (!file)
384 return;
385
386 spin_lock_irqsave(&file->lock, flags);
387 if (file->is_closed) {
388 spin_unlock_irqrestore(&file->lock, flags);
389 return;
390 }
391
392 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
393 if (!entry) {
394 spin_unlock_irqrestore(&file->lock, flags);
395 return;
396 }
397
398 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
399
400 entry->desc.comp.cq_handle = cq->uobject->user_handle;
401 entry->counter = &uobj->comp_events_reported;
402
403 list_add_tail(&entry->list, &file->event_list);
404 list_add_tail(&entry->obj_list, &uobj->comp_list);
405 spin_unlock_irqrestore(&file->lock, flags);
406
407 wake_up_interruptible(&file->poll_wait);
408 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
409}
410
411static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
412 __u64 element, __u64 event,
413 struct list_head *obj_list,
414 u32 *counter)
415{
416 struct ib_uverbs_event *entry;
417 unsigned long flags;
418
419 spin_lock_irqsave(&file->async_file->lock, flags);
420 if (file->async_file->is_closed) {
421 spin_unlock_irqrestore(&file->async_file->lock, flags);
422 return;
423 }
424
425 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
426 if (!entry) {
427 spin_unlock_irqrestore(&file->async_file->lock, flags);
428 return;
429 }
430
431 entry->desc.async.element = element;
432 entry->desc.async.event_type = event;
433 entry->counter = counter;
434
435 list_add_tail(&entry->list, &file->async_file->event_list);
436 if (obj_list)
437 list_add_tail(&entry->obj_list, obj_list);
438 spin_unlock_irqrestore(&file->async_file->lock, flags);
439
440 wake_up_interruptible(&file->async_file->poll_wait);
441 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
442}
443
444void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
445{
446 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
447 struct ib_ucq_object, uobject);
448
449 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
450 event->event, &uobj->async_list,
451 &uobj->async_events_reported);
452}
453
454void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
455{
456 struct ib_uevent_object *uobj;
457
458 uobj = container_of(event->element.qp->uobject,
459 struct ib_uevent_object, uobject);
460
461 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
462 event->event, &uobj->event_list,
463 &uobj->events_reported);
464}
465
466void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
467{
468 struct ib_uevent_object *uobj;
469
470 uobj = container_of(event->element.srq->uobject,
471 struct ib_uevent_object, uobject);
472
473 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
474 event->event, &uobj->event_list,
475 &uobj->events_reported);
476}
477
478void ib_uverbs_event_handler(struct ib_event_handler *handler,
479 struct ib_event *event)
480{
481 struct ib_uverbs_file *file =
482 container_of(handler, struct ib_uverbs_file, event_handler);
483
484 ib_uverbs_async_handler(file, event->element.port_num, event->event,
485 NULL, NULL);
486}
487
488struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
489 int is_async)
490{
491 struct ib_uverbs_event_file *ev_file;
492 struct file *filp;
493
494 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
495 if (!ev_file)
496 return ERR_PTR(-ENOMEM);
497
498 kref_init(&ev_file->ref);
499 spin_lock_init(&ev_file->lock);
500 INIT_LIST_HEAD(&ev_file->event_list);
501 init_waitqueue_head(&ev_file->poll_wait);
502 ev_file->uverbs_file = uverbs_file;
503 ev_file->async_queue = NULL;
504 ev_file->is_async = is_async;
505 ev_file->is_closed = 0;
506
507 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
508 ev_file, O_RDONLY);
509 if (IS_ERR(filp))
510 kfree(ev_file);
511
512 return filp;
513}
514
515/*
516 * Look up a completion event file by FD. If lookup is successful,
517 * takes a ref to the event file struct that it returns; if
518 * unsuccessful, returns NULL.
519 */
520struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
521{
522 struct ib_uverbs_event_file *ev_file = NULL;
523 struct file *filp;
524
525 filp = fget(fd);
526 if (!filp)
527 return NULL;
528
529 if (filp->f_op != &uverbs_event_fops)
530 goto out;
531
532 ev_file = filp->private_data;
533 if (ev_file->is_async) {
534 ev_file = NULL;
535 goto out;
536 }
537
538 kref_get(&ev_file->ref);
539
540out:
541 fput(filp);
542 return ev_file;
543}
544
545static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
546 size_t count, loff_t *pos)
547{
548 struct ib_uverbs_file *file = filp->private_data;
549 struct ib_uverbs_cmd_hdr hdr;
550
551 if (count < sizeof hdr)
552 return -EINVAL;
553
554 if (copy_from_user(&hdr, buf, sizeof hdr))
555 return -EFAULT;
556
557 if (hdr.in_words * 4 != count)
558 return -EINVAL;
559
560 if (hdr.command < 0 ||
561 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
562 !uverbs_cmd_table[hdr.command])
563 return -EINVAL;
564
565 if (!file->ucontext &&
566 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
567 return -EINVAL;
568
569 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
570 return -ENOSYS;
571
572 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
573 hdr.in_words * 4, hdr.out_words * 4);
574}
575
576static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
577{
578 struct ib_uverbs_file *file = filp->private_data;
579
580 if (!file->ucontext)
581 return -ENODEV;
582 else
583 return file->device->ib_dev->mmap(file->ucontext, vma);
584}
585
586/*
587 * ib_uverbs_open() does not need the BKL:
588 *
589 * - the ib_uverbs_device structures are properly reference counted and
590 * everything else is purely local to the file being created, so
591 * races against other open calls are not a problem;
592 * - there is no ioctl method to race against;
593 * - the open method will either immediately run -ENXIO, or all
594 * required initialization will be done.
595 */
596static int ib_uverbs_open(struct inode *inode, struct file *filp)
597{
598 struct ib_uverbs_device *dev;
599 struct ib_uverbs_file *file;
600 int ret;
601
602 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
603 if (dev)
604 kref_get(&dev->ref);
605 else
606 return -ENXIO;
607
608 if (!try_module_get(dev->ib_dev->owner)) {
609 ret = -ENODEV;
610 goto err;
611 }
612
613 file = kmalloc(sizeof *file, GFP_KERNEL);
614 if (!file) {
615 ret = -ENOMEM;
616 goto err_module;
617 }
618
619 file->device = dev;
620 file->ucontext = NULL;
621 file->async_file = NULL;
622 kref_init(&file->ref);
623 mutex_init(&file->mutex);
624
625 filp->private_data = file;
626
627 return nonseekable_open(inode, filp);
628
629err_module:
630 module_put(dev->ib_dev->owner);
631
632err:
633 kref_put(&dev->ref, ib_uverbs_release_dev);
634 return ret;
635}
636
637static int ib_uverbs_close(struct inode *inode, struct file *filp)
638{
639 struct ib_uverbs_file *file = filp->private_data;
640
641 ib_uverbs_cleanup_ucontext(file, file->ucontext);
642
643 if (file->async_file)
644 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
645
646 kref_put(&file->ref, ib_uverbs_release_file);
647
648 return 0;
649}
650
651static const struct file_operations uverbs_fops = {
652 .owner = THIS_MODULE,
653 .write = ib_uverbs_write,
654 .open = ib_uverbs_open,
655 .release = ib_uverbs_close,
656 .llseek = no_llseek,
657};
658
659static const struct file_operations uverbs_mmap_fops = {
660 .owner = THIS_MODULE,
661 .write = ib_uverbs_write,
662 .mmap = ib_uverbs_mmap,
663 .open = ib_uverbs_open,
664 .release = ib_uverbs_close,
665 .llseek = no_llseek,
666};
667
668static struct ib_client uverbs_client = {
669 .name = "uverbs",
670 .add = ib_uverbs_add_one,
671 .remove = ib_uverbs_remove_one
672};
673
674static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
675 char *buf)
676{
677 struct ib_uverbs_device *dev = dev_get_drvdata(device);
678
679 if (!dev)
680 return -ENODEV;
681
682 return sprintf(buf, "%s\n", dev->ib_dev->name);
683}
684static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
685
686static ssize_t show_dev_abi_version(struct device *device,
687 struct device_attribute *attr, char *buf)
688{
689 struct ib_uverbs_device *dev = dev_get_drvdata(device);
690
691 if (!dev)
692 return -ENODEV;
693
694 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
695}
696static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
697
698static CLASS_ATTR_STRING(abi_version, S_IRUGO,
699 __stringify(IB_USER_VERBS_ABI_VERSION));
700
701static dev_t overflow_maj;
702static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
703
704/*
705 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
706 * requesting a new major number and doubling the number of max devices we
707 * support. It's stupid, but simple.
708 */
709static int find_overflow_devnum(void)
710{
711 int ret;
712
713 if (!overflow_maj) {
714 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
715 "infiniband_verbs");
716 if (ret) {
717 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
718 return ret;
719 }
720 }
721
722 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
723 if (ret >= IB_UVERBS_MAX_DEVICES)
724 return -1;
725
726 return ret;
727}
728
729static void ib_uverbs_add_one(struct ib_device *device)
730{
731 int devnum;
732 dev_t base;
733 struct ib_uverbs_device *uverbs_dev;
734
735 if (!device->alloc_ucontext)
736 return;
737
738 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
739 if (!uverbs_dev)
740 return;
741
742 kref_init(&uverbs_dev->ref);
743 init_completion(&uverbs_dev->comp);
744
745 spin_lock(&map_lock);
746 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
747 if (devnum >= IB_UVERBS_MAX_DEVICES) {
748 spin_unlock(&map_lock);
749 devnum = find_overflow_devnum();
750 if (devnum < 0)
751 goto err;
752
753 spin_lock(&map_lock);
754 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
755 base = devnum + overflow_maj;
756 set_bit(devnum, overflow_map);
757 } else {
758 uverbs_dev->devnum = devnum;
759 base = devnum + IB_UVERBS_BASE_DEV;
760 set_bit(devnum, dev_map);
761 }
762 spin_unlock(&map_lock);
763
764 uverbs_dev->ib_dev = device;
765 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
766
767 cdev_init(&uverbs_dev->cdev, NULL);
768 uverbs_dev->cdev.owner = THIS_MODULE;
769 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
770 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
771 if (cdev_add(&uverbs_dev->cdev, base, 1))
772 goto err_cdev;
773
774 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
775 uverbs_dev->cdev.dev, uverbs_dev,
776 "uverbs%d", uverbs_dev->devnum);
777 if (IS_ERR(uverbs_dev->dev))
778 goto err_cdev;
779
780 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
781 goto err_class;
782 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
783 goto err_class;
784
785 ib_set_client_data(device, &uverbs_client, uverbs_dev);
786
787 return;
788
789err_class:
790 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
791
792err_cdev:
793 cdev_del(&uverbs_dev->cdev);
794 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
795 clear_bit(devnum, dev_map);
796 else
797 clear_bit(devnum, overflow_map);
798
799err:
800 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
801 wait_for_completion(&uverbs_dev->comp);
802 kfree(uverbs_dev);
803 return;
804}
805
806static void ib_uverbs_remove_one(struct ib_device *device)
807{
808 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
809
810 if (!uverbs_dev)
811 return;
812
813 dev_set_drvdata(uverbs_dev->dev, NULL);
814 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
815 cdev_del(&uverbs_dev->cdev);
816
817 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
818 clear_bit(uverbs_dev->devnum, dev_map);
819 else
820 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
821
822 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
823 wait_for_completion(&uverbs_dev->comp);
824 kfree(uverbs_dev);
825}
826
827static char *uverbs_devnode(struct device *dev, mode_t *mode)
828{
829 if (mode)
830 *mode = 0666;
831 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
832}
833
834static int __init ib_uverbs_init(void)
835{
836 int ret;
837
838 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
839 "infiniband_verbs");
840 if (ret) {
841 printk(KERN_ERR "user_verbs: couldn't register device number\n");
842 goto out;
843 }
844
845 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
846 if (IS_ERR(uverbs_class)) {
847 ret = PTR_ERR(uverbs_class);
848 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
849 goto out_chrdev;
850 }
851
852 uverbs_class->devnode = uverbs_devnode;
853
854 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
855 if (ret) {
856 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
857 goto out_class;
858 }
859
860 ret = ib_register_client(&uverbs_client);
861 if (ret) {
862 printk(KERN_ERR "user_verbs: couldn't register client\n");
863 goto out_class;
864 }
865
866 return 0;
867
868out_class:
869 class_destroy(uverbs_class);
870
871out_chrdev:
872 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
873
874out:
875 return ret;
876}
877
878static void __exit ib_uverbs_cleanup(void)
879{
880 ib_unregister_client(&uverbs_client);
881 class_destroy(uverbs_class);
882 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
883 if (overflow_maj)
884 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
885 idr_destroy(&ib_uverbs_pd_idr);
886 idr_destroy(&ib_uverbs_mr_idr);
887 idr_destroy(&ib_uverbs_mw_idr);
888 idr_destroy(&ib_uverbs_ah_idr);
889 idr_destroy(&ib_uverbs_cq_idr);
890 idr_destroy(&ib_uverbs_qp_idr);
891 idr_destroy(&ib_uverbs_srq_idr);
892}
893
894module_init(ib_uverbs_init);
895module_exit(ib_uverbs_cleanup);
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#include <linux/sched/mm.h>
49
50#include <linux/uaccess.h>
51
52#include <rdma/ib.h>
53#include <rdma/uverbs_std_types.h>
54#include <rdma/rdma_netlink.h>
55
56#include "uverbs.h"
57#include "core_priv.h"
58#include "rdma_core.h"
59
60MODULE_AUTHOR("Roland Dreier");
61MODULE_DESCRIPTION("InfiniBand userspace verbs access");
62MODULE_LICENSE("Dual BSD/GPL");
63
64enum {
65 IB_UVERBS_MAJOR = 231,
66 IB_UVERBS_BASE_MINOR = 192,
67 IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
68 IB_UVERBS_NUM_FIXED_MINOR = 32,
69 IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
70};
71
72#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
73
74static dev_t dynamic_uverbs_dev;
75static struct class *uverbs_class;
76
77static DEFINE_IDA(uverbs_ida);
78static int ib_uverbs_add_one(struct ib_device *device);
79static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
80
81/*
82 * Must be called with the ufile->device->disassociate_srcu held, and the lock
83 * must be held until use of the ucontext is finished.
84 */
85struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
86{
87 /*
88 * We do not hold the hw_destroy_rwsem lock for this flow, instead
89 * srcu is used. It does not matter if someone races this with
90 * get_context, we get NULL or valid ucontext.
91 */
92 struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
93
94 if (!srcu_dereference(ufile->device->ib_dev,
95 &ufile->device->disassociate_srcu))
96 return ERR_PTR(-EIO);
97
98 if (!ucontext)
99 return ERR_PTR(-EINVAL);
100
101 return ucontext;
102}
103EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
104
105int uverbs_dealloc_mw(struct ib_mw *mw)
106{
107 struct ib_pd *pd = mw->pd;
108 int ret;
109
110 ret = mw->device->ops.dealloc_mw(mw);
111 if (!ret)
112 atomic_dec(&pd->usecnt);
113 return ret;
114}
115
116static void ib_uverbs_release_dev(struct device *device)
117{
118 struct ib_uverbs_device *dev =
119 container_of(device, struct ib_uverbs_device, dev);
120
121 uverbs_destroy_api(dev->uapi);
122 cleanup_srcu_struct(&dev->disassociate_srcu);
123 mutex_destroy(&dev->lists_mutex);
124 mutex_destroy(&dev->xrcd_tree_mutex);
125 kfree(dev);
126}
127
128void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
129 struct ib_ucq_object *uobj)
130{
131 struct ib_uverbs_event *evt, *tmp;
132
133 if (ev_file) {
134 spin_lock_irq(&ev_file->ev_queue.lock);
135 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
136 list_del(&evt->list);
137 kfree(evt);
138 }
139 spin_unlock_irq(&ev_file->ev_queue.lock);
140
141 uverbs_uobject_put(&ev_file->uobj);
142 }
143
144 ib_uverbs_release_uevent(&uobj->uevent);
145}
146
147void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
148{
149 struct ib_uverbs_async_event_file *async_file = uobj->event_file;
150 struct ib_uverbs_event *evt, *tmp;
151
152 if (!async_file)
153 return;
154
155 spin_lock_irq(&async_file->ev_queue.lock);
156 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
157 list_del(&evt->list);
158 kfree(evt);
159 }
160 spin_unlock_irq(&async_file->ev_queue.lock);
161 uverbs_uobject_put(&async_file->uobj);
162}
163
164void ib_uverbs_detach_umcast(struct ib_qp *qp,
165 struct ib_uqp_object *uobj)
166{
167 struct ib_uverbs_mcast_entry *mcast, *tmp;
168
169 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
170 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
171 list_del(&mcast->list);
172 kfree(mcast);
173 }
174}
175
176static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
177{
178 complete(&dev->comp);
179}
180
181void ib_uverbs_release_file(struct kref *ref)
182{
183 struct ib_uverbs_file *file =
184 container_of(ref, struct ib_uverbs_file, ref);
185 struct ib_device *ib_dev;
186 int srcu_key;
187
188 release_ufile_idr_uobject(file);
189
190 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
191 ib_dev = srcu_dereference(file->device->ib_dev,
192 &file->device->disassociate_srcu);
193 if (ib_dev && !ib_dev->ops.disassociate_ucontext)
194 module_put(ib_dev->ops.owner);
195 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
196
197 if (atomic_dec_and_test(&file->device->refcount))
198 ib_uverbs_comp_dev(file->device);
199
200 if (file->default_async_file)
201 uverbs_uobject_put(&file->default_async_file->uobj);
202 put_device(&file->device->dev);
203
204 if (file->disassociate_page)
205 __free_pages(file->disassociate_page, 0);
206 mutex_destroy(&file->umap_lock);
207 mutex_destroy(&file->ucontext_lock);
208 kfree(file);
209}
210
211static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
212 struct file *filp, char __user *buf,
213 size_t count, loff_t *pos,
214 size_t eventsz)
215{
216 struct ib_uverbs_event *event;
217 int ret = 0;
218
219 spin_lock_irq(&ev_queue->lock);
220
221 while (list_empty(&ev_queue->event_list)) {
222 spin_unlock_irq(&ev_queue->lock);
223
224 if (filp->f_flags & O_NONBLOCK)
225 return -EAGAIN;
226
227 if (wait_event_interruptible(ev_queue->poll_wait,
228 (!list_empty(&ev_queue->event_list) ||
229 ev_queue->is_closed)))
230 return -ERESTARTSYS;
231
232 spin_lock_irq(&ev_queue->lock);
233
234 /* If device was disassociated and no event exists set an error */
235 if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) {
236 spin_unlock_irq(&ev_queue->lock);
237 return -EIO;
238 }
239 }
240
241 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
242
243 if (eventsz > count) {
244 ret = -EINVAL;
245 event = NULL;
246 } else {
247 list_del(ev_queue->event_list.next);
248 if (event->counter) {
249 ++(*event->counter);
250 list_del(&event->obj_list);
251 }
252 }
253
254 spin_unlock_irq(&ev_queue->lock);
255
256 if (event) {
257 if (copy_to_user(buf, event, eventsz))
258 ret = -EFAULT;
259 else
260 ret = eventsz;
261 }
262
263 kfree(event);
264
265 return ret;
266}
267
268static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
269 size_t count, loff_t *pos)
270{
271 struct ib_uverbs_async_event_file *file = filp->private_data;
272
273 return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
274 sizeof(struct ib_uverbs_async_event_desc));
275}
276
277static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
278 size_t count, loff_t *pos)
279{
280 struct ib_uverbs_completion_event_file *comp_ev_file =
281 filp->private_data;
282
283 return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
284 pos,
285 sizeof(struct ib_uverbs_comp_event_desc));
286}
287
288static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
289 struct file *filp,
290 struct poll_table_struct *wait)
291{
292 __poll_t pollflags = 0;
293
294 poll_wait(filp, &ev_queue->poll_wait, wait);
295
296 spin_lock_irq(&ev_queue->lock);
297 if (!list_empty(&ev_queue->event_list))
298 pollflags = EPOLLIN | EPOLLRDNORM;
299 else if (ev_queue->is_closed)
300 pollflags = EPOLLERR;
301 spin_unlock_irq(&ev_queue->lock);
302
303 return pollflags;
304}
305
306static __poll_t ib_uverbs_async_event_poll(struct file *filp,
307 struct poll_table_struct *wait)
308{
309 struct ib_uverbs_async_event_file *file = filp->private_data;
310
311 return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
312}
313
314static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
315 struct poll_table_struct *wait)
316{
317 struct ib_uverbs_completion_event_file *comp_ev_file =
318 filp->private_data;
319
320 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
321}
322
323static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
324{
325 struct ib_uverbs_async_event_file *file = filp->private_data;
326
327 return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
328}
329
330static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
331{
332 struct ib_uverbs_completion_event_file *comp_ev_file =
333 filp->private_data;
334
335 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
336}
337
338const struct file_operations uverbs_event_fops = {
339 .owner = THIS_MODULE,
340 .read = ib_uverbs_comp_event_read,
341 .poll = ib_uverbs_comp_event_poll,
342 .release = uverbs_uobject_fd_release,
343 .fasync = ib_uverbs_comp_event_fasync,
344 .llseek = no_llseek,
345};
346
347const struct file_operations uverbs_async_event_fops = {
348 .owner = THIS_MODULE,
349 .read = ib_uverbs_async_event_read,
350 .poll = ib_uverbs_async_event_poll,
351 .release = uverbs_async_event_release,
352 .fasync = ib_uverbs_async_event_fasync,
353 .llseek = no_llseek,
354};
355
356void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
357{
358 struct ib_uverbs_event_queue *ev_queue = cq_context;
359 struct ib_ucq_object *uobj;
360 struct ib_uverbs_event *entry;
361 unsigned long flags;
362
363 if (!ev_queue)
364 return;
365
366 spin_lock_irqsave(&ev_queue->lock, flags);
367 if (ev_queue->is_closed) {
368 spin_unlock_irqrestore(&ev_queue->lock, flags);
369 return;
370 }
371
372 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
373 if (!entry) {
374 spin_unlock_irqrestore(&ev_queue->lock, flags);
375 return;
376 }
377
378 uobj = cq->uobject;
379
380 entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle;
381 entry->counter = &uobj->comp_events_reported;
382
383 list_add_tail(&entry->list, &ev_queue->event_list);
384 list_add_tail(&entry->obj_list, &uobj->comp_list);
385 spin_unlock_irqrestore(&ev_queue->lock, flags);
386
387 wake_up_interruptible(&ev_queue->poll_wait);
388 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
389}
390
391void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
392 __u64 element, __u64 event,
393 struct list_head *obj_list, u32 *counter)
394{
395 struct ib_uverbs_event *entry;
396 unsigned long flags;
397
398 if (!async_file)
399 return;
400
401 spin_lock_irqsave(&async_file->ev_queue.lock, flags);
402 if (async_file->ev_queue.is_closed) {
403 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
404 return;
405 }
406
407 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
408 if (!entry) {
409 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
410 return;
411 }
412
413 entry->desc.async.element = element;
414 entry->desc.async.event_type = event;
415 entry->desc.async.reserved = 0;
416 entry->counter = counter;
417
418 list_add_tail(&entry->list, &async_file->ev_queue.event_list);
419 if (obj_list)
420 list_add_tail(&entry->obj_list, obj_list);
421 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
422
423 wake_up_interruptible(&async_file->ev_queue.poll_wait);
424 kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN);
425}
426
427static void uverbs_uobj_event(struct ib_uevent_object *eobj,
428 struct ib_event *event)
429{
430 ib_uverbs_async_handler(eobj->event_file,
431 eobj->uobject.user_handle, event->event,
432 &eobj->event_list, &eobj->events_reported);
433}
434
435void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
436{
437 uverbs_uobj_event(&event->element.cq->uobject->uevent, event);
438}
439
440void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
441{
442 /* for XRC target qp's, check that qp is live */
443 if (!event->element.qp->uobject)
444 return;
445
446 uverbs_uobj_event(&event->element.qp->uobject->uevent, event);
447}
448
449void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
450{
451 uverbs_uobj_event(&event->element.wq->uobject->uevent, event);
452}
453
454void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
455{
456 uverbs_uobj_event(&event->element.srq->uobject->uevent, event);
457}
458
459static void ib_uverbs_event_handler(struct ib_event_handler *handler,
460 struct ib_event *event)
461{
462 ib_uverbs_async_handler(
463 container_of(handler, struct ib_uverbs_async_event_file,
464 event_handler),
465 event->element.port_num, event->event, NULL, NULL);
466}
467
468void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
469{
470 spin_lock_init(&ev_queue->lock);
471 INIT_LIST_HEAD(&ev_queue->event_list);
472 init_waitqueue_head(&ev_queue->poll_wait);
473 ev_queue->is_closed = 0;
474 ev_queue->async_queue = NULL;
475}
476
477void ib_uverbs_init_async_event_file(
478 struct ib_uverbs_async_event_file *async_file)
479{
480 struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile;
481 struct ib_device *ib_dev = async_file->uobj.context->device;
482
483 ib_uverbs_init_event_queue(&async_file->ev_queue);
484
485 /* The first async_event_file becomes the default one for the file. */
486 mutex_lock(&uverbs_file->ucontext_lock);
487 if (!uverbs_file->default_async_file) {
488 /* Pairs with the put in ib_uverbs_release_file */
489 uverbs_uobject_get(&async_file->uobj);
490 smp_store_release(&uverbs_file->default_async_file, async_file);
491 }
492 mutex_unlock(&uverbs_file->ucontext_lock);
493
494 INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev,
495 ib_uverbs_event_handler);
496 ib_register_event_handler(&async_file->event_handler);
497}
498
499static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
500 struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
501 const struct uverbs_api_write_method *method_elm)
502{
503 if (method_elm->is_ex) {
504 count -= sizeof(*hdr) + sizeof(*ex_hdr);
505
506 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
507 return -EINVAL;
508
509 if (hdr->in_words * 8 < method_elm->req_size)
510 return -ENOSPC;
511
512 if (ex_hdr->cmd_hdr_reserved)
513 return -EINVAL;
514
515 if (ex_hdr->response) {
516 if (!hdr->out_words && !ex_hdr->provider_out_words)
517 return -EINVAL;
518
519 if (hdr->out_words * 8 < method_elm->resp_size)
520 return -ENOSPC;
521
522 if (!access_ok(u64_to_user_ptr(ex_hdr->response),
523 (hdr->out_words + ex_hdr->provider_out_words) * 8))
524 return -EFAULT;
525 } else {
526 if (hdr->out_words || ex_hdr->provider_out_words)
527 return -EINVAL;
528 }
529
530 return 0;
531 }
532
533 /* not extended command */
534 if (hdr->in_words * 4 != count)
535 return -EINVAL;
536
537 if (count < method_elm->req_size + sizeof(hdr)) {
538 /*
539 * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
540 * with a 16 byte write instead of 24. Old kernels didn't
541 * check the size so they allowed this. Now that the size is
542 * checked provide a compatibility work around to not break
543 * those userspaces.
544 */
545 if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
546 count == 16) {
547 hdr->in_words = 6;
548 return 0;
549 }
550 return -ENOSPC;
551 }
552 if (hdr->out_words * 4 < method_elm->resp_size)
553 return -ENOSPC;
554
555 return 0;
556}
557
558static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
559 size_t count, loff_t *pos)
560{
561 struct ib_uverbs_file *file = filp->private_data;
562 const struct uverbs_api_write_method *method_elm;
563 struct uverbs_api *uapi = file->device->uapi;
564 struct ib_uverbs_ex_cmd_hdr ex_hdr;
565 struct ib_uverbs_cmd_hdr hdr;
566 struct uverbs_attr_bundle bundle;
567 int srcu_key;
568 ssize_t ret;
569
570 if (!ib_safe_file_access(filp)) {
571 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
572 task_tgid_vnr(current), current->comm);
573 return -EACCES;
574 }
575
576 if (count < sizeof(hdr))
577 return -EINVAL;
578
579 if (copy_from_user(&hdr, buf, sizeof(hdr)))
580 return -EFAULT;
581
582 method_elm = uapi_get_method(uapi, hdr.command);
583 if (IS_ERR(method_elm))
584 return PTR_ERR(method_elm);
585
586 if (method_elm->is_ex) {
587 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
588 return -EINVAL;
589 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
590 return -EFAULT;
591 }
592
593 ret = verify_hdr(&hdr, &ex_hdr, count, method_elm);
594 if (ret)
595 return ret;
596
597 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
598
599 buf += sizeof(hdr);
600
601 memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
602 bundle.ufile = file;
603 bundle.context = NULL; /* only valid if bundle has uobject */
604 bundle.uobject = NULL;
605 if (!method_elm->is_ex) {
606 size_t in_len = hdr.in_words * 4 - sizeof(hdr);
607 size_t out_len = hdr.out_words * 4;
608 u64 response = 0;
609
610 if (method_elm->has_udata) {
611 bundle.driver_udata.inlen =
612 in_len - method_elm->req_size;
613 in_len = method_elm->req_size;
614 if (bundle.driver_udata.inlen)
615 bundle.driver_udata.inbuf = buf + in_len;
616 else
617 bundle.driver_udata.inbuf = NULL;
618 } else {
619 memset(&bundle.driver_udata, 0,
620 sizeof(bundle.driver_udata));
621 }
622
623 if (method_elm->has_resp) {
624 /*
625 * The macros check that if has_resp is set
626 * then the command request structure starts
627 * with a '__aligned u64 response' member.
628 */
629 ret = get_user(response, (const u64 __user *)buf);
630 if (ret)
631 goto out_unlock;
632
633 if (method_elm->has_udata) {
634 bundle.driver_udata.outlen =
635 out_len - method_elm->resp_size;
636 out_len = method_elm->resp_size;
637 if (bundle.driver_udata.outlen)
638 bundle.driver_udata.outbuf =
639 u64_to_user_ptr(response +
640 out_len);
641 else
642 bundle.driver_udata.outbuf = NULL;
643 }
644 } else {
645 bundle.driver_udata.outlen = 0;
646 bundle.driver_udata.outbuf = NULL;
647 }
648
649 ib_uverbs_init_udata_buf_or_null(
650 &bundle.ucore, buf, u64_to_user_ptr(response),
651 in_len, out_len);
652 } else {
653 buf += sizeof(ex_hdr);
654
655 ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
656 u64_to_user_ptr(ex_hdr.response),
657 hdr.in_words * 8, hdr.out_words * 8);
658
659 ib_uverbs_init_udata_buf_or_null(
660 &bundle.driver_udata, buf + bundle.ucore.inlen,
661 u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
662 ex_hdr.provider_in_words * 8,
663 ex_hdr.provider_out_words * 8);
664
665 }
666
667 ret = method_elm->handler(&bundle);
668 if (bundle.uobject)
669 uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true,
670 !ret, &bundle);
671out_unlock:
672 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
673 return (ret) ? : count;
674}
675
676static const struct vm_operations_struct rdma_umap_ops;
677
678static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
679{
680 struct ib_uverbs_file *file = filp->private_data;
681 struct ib_ucontext *ucontext;
682 int ret = 0;
683 int srcu_key;
684
685 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
686 ucontext = ib_uverbs_get_ucontext_file(file);
687 if (IS_ERR(ucontext)) {
688 ret = PTR_ERR(ucontext);
689 goto out;
690 }
691 vma->vm_ops = &rdma_umap_ops;
692 ret = ucontext->device->ops.mmap(ucontext, vma);
693out:
694 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
695 return ret;
696}
697
698/*
699 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
700 * struct
701 */
702static void rdma_umap_open(struct vm_area_struct *vma)
703{
704 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
705 struct rdma_umap_priv *opriv = vma->vm_private_data;
706 struct rdma_umap_priv *priv;
707
708 if (!opriv)
709 return;
710
711 /* We are racing with disassociation */
712 if (!down_read_trylock(&ufile->hw_destroy_rwsem))
713 goto out_zap;
714 /*
715 * Disassociation already completed, the VMA should already be zapped.
716 */
717 if (!ufile->ucontext)
718 goto out_unlock;
719
720 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
721 if (!priv)
722 goto out_unlock;
723 rdma_umap_priv_init(priv, vma, opriv->entry);
724
725 up_read(&ufile->hw_destroy_rwsem);
726 return;
727
728out_unlock:
729 up_read(&ufile->hw_destroy_rwsem);
730out_zap:
731 /*
732 * We can't allow the VMA to be created with the actual IO pages, that
733 * would break our API contract, and it can't be stopped at this
734 * point, so zap it.
735 */
736 vma->vm_private_data = NULL;
737 zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
738}
739
740static void rdma_umap_close(struct vm_area_struct *vma)
741{
742 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
743 struct rdma_umap_priv *priv = vma->vm_private_data;
744
745 if (!priv)
746 return;
747
748 /*
749 * The vma holds a reference on the struct file that created it, which
750 * in turn means that the ib_uverbs_file is guaranteed to exist at
751 * this point.
752 */
753 mutex_lock(&ufile->umap_lock);
754 if (priv->entry)
755 rdma_user_mmap_entry_put(priv->entry);
756
757 list_del(&priv->list);
758 mutex_unlock(&ufile->umap_lock);
759 kfree(priv);
760}
761
762/*
763 * Once the zap_vma_ptes has been called touches to the VMA will come here and
764 * we return a dummy writable zero page for all the pfns.
765 */
766static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
767{
768 struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
769 struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
770 vm_fault_t ret = 0;
771
772 if (!priv)
773 return VM_FAULT_SIGBUS;
774
775 /* Read only pages can just use the system zero page. */
776 if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
777 vmf->page = ZERO_PAGE(vmf->address);
778 get_page(vmf->page);
779 return 0;
780 }
781
782 mutex_lock(&ufile->umap_lock);
783 if (!ufile->disassociate_page)
784 ufile->disassociate_page =
785 alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
786
787 if (ufile->disassociate_page) {
788 /*
789 * This VMA is forced to always be shared so this doesn't have
790 * to worry about COW.
791 */
792 vmf->page = ufile->disassociate_page;
793 get_page(vmf->page);
794 } else {
795 ret = VM_FAULT_SIGBUS;
796 }
797 mutex_unlock(&ufile->umap_lock);
798
799 return ret;
800}
801
802static const struct vm_operations_struct rdma_umap_ops = {
803 .open = rdma_umap_open,
804 .close = rdma_umap_close,
805 .fault = rdma_umap_fault,
806};
807
808void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
809{
810 struct rdma_umap_priv *priv, *next_priv;
811
812 lockdep_assert_held(&ufile->hw_destroy_rwsem);
813
814 while (1) {
815 struct mm_struct *mm = NULL;
816
817 /* Get an arbitrary mm pointer that hasn't been cleaned yet */
818 mutex_lock(&ufile->umap_lock);
819 while (!list_empty(&ufile->umaps)) {
820 int ret;
821
822 priv = list_first_entry(&ufile->umaps,
823 struct rdma_umap_priv, list);
824 mm = priv->vma->vm_mm;
825 ret = mmget_not_zero(mm);
826 if (!ret) {
827 list_del_init(&priv->list);
828 if (priv->entry) {
829 rdma_user_mmap_entry_put(priv->entry);
830 priv->entry = NULL;
831 }
832 mm = NULL;
833 continue;
834 }
835 break;
836 }
837 mutex_unlock(&ufile->umap_lock);
838 if (!mm)
839 return;
840
841 /*
842 * The umap_lock is nested under mmap_lock since it used within
843 * the vma_ops callbacks, so we have to clean the list one mm
844 * at a time to get the lock ordering right. Typically there
845 * will only be one mm, so no big deal.
846 */
847 mmap_read_lock(mm);
848 if (!mmget_still_valid(mm))
849 goto skip_mm;
850 mutex_lock(&ufile->umap_lock);
851 list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
852 list) {
853 struct vm_area_struct *vma = priv->vma;
854
855 if (vma->vm_mm != mm)
856 continue;
857 list_del_init(&priv->list);
858
859 zap_vma_ptes(vma, vma->vm_start,
860 vma->vm_end - vma->vm_start);
861
862 if (priv->entry) {
863 rdma_user_mmap_entry_put(priv->entry);
864 priv->entry = NULL;
865 }
866 }
867 mutex_unlock(&ufile->umap_lock);
868 skip_mm:
869 mmap_read_unlock(mm);
870 mmput(mm);
871 }
872}
873
874/*
875 * ib_uverbs_open() does not need the BKL:
876 *
877 * - the ib_uverbs_device structures are properly reference counted and
878 * everything else is purely local to the file being created, so
879 * races against other open calls are not a problem;
880 * - there is no ioctl method to race against;
881 * - the open method will either immediately run -ENXIO, or all
882 * required initialization will be done.
883 */
884static int ib_uverbs_open(struct inode *inode, struct file *filp)
885{
886 struct ib_uverbs_device *dev;
887 struct ib_uverbs_file *file;
888 struct ib_device *ib_dev;
889 int ret;
890 int module_dependent;
891 int srcu_key;
892
893 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
894 if (!atomic_inc_not_zero(&dev->refcount))
895 return -ENXIO;
896
897 get_device(&dev->dev);
898 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
899 mutex_lock(&dev->lists_mutex);
900 ib_dev = srcu_dereference(dev->ib_dev,
901 &dev->disassociate_srcu);
902 if (!ib_dev) {
903 ret = -EIO;
904 goto err;
905 }
906
907 if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
908 ret = -EPERM;
909 goto err;
910 }
911
912 /* In case IB device supports disassociate ucontext, there is no hard
913 * dependency between uverbs device and its low level device.
914 */
915 module_dependent = !(ib_dev->ops.disassociate_ucontext);
916
917 if (module_dependent) {
918 if (!try_module_get(ib_dev->ops.owner)) {
919 ret = -ENODEV;
920 goto err;
921 }
922 }
923
924 file = kzalloc(sizeof(*file), GFP_KERNEL);
925 if (!file) {
926 ret = -ENOMEM;
927 if (module_dependent)
928 goto err_module;
929
930 goto err;
931 }
932
933 file->device = dev;
934 kref_init(&file->ref);
935 mutex_init(&file->ucontext_lock);
936
937 spin_lock_init(&file->uobjects_lock);
938 INIT_LIST_HEAD(&file->uobjects);
939 init_rwsem(&file->hw_destroy_rwsem);
940 mutex_init(&file->umap_lock);
941 INIT_LIST_HEAD(&file->umaps);
942
943 filp->private_data = file;
944 list_add_tail(&file->list, &dev->uverbs_file_list);
945 mutex_unlock(&dev->lists_mutex);
946 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
947
948 setup_ufile_idr_uobject(file);
949
950 return stream_open(inode, filp);
951
952err_module:
953 module_put(ib_dev->ops.owner);
954
955err:
956 mutex_unlock(&dev->lists_mutex);
957 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
958 if (atomic_dec_and_test(&dev->refcount))
959 ib_uverbs_comp_dev(dev);
960
961 put_device(&dev->dev);
962 return ret;
963}
964
965static int ib_uverbs_close(struct inode *inode, struct file *filp)
966{
967 struct ib_uverbs_file *file = filp->private_data;
968
969 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
970
971 mutex_lock(&file->device->lists_mutex);
972 list_del_init(&file->list);
973 mutex_unlock(&file->device->lists_mutex);
974
975 kref_put(&file->ref, ib_uverbs_release_file);
976
977 return 0;
978}
979
980static const struct file_operations uverbs_fops = {
981 .owner = THIS_MODULE,
982 .write = ib_uverbs_write,
983 .open = ib_uverbs_open,
984 .release = ib_uverbs_close,
985 .llseek = no_llseek,
986 .unlocked_ioctl = ib_uverbs_ioctl,
987 .compat_ioctl = compat_ptr_ioctl,
988};
989
990static const struct file_operations uverbs_mmap_fops = {
991 .owner = THIS_MODULE,
992 .write = ib_uverbs_write,
993 .mmap = ib_uverbs_mmap,
994 .open = ib_uverbs_open,
995 .release = ib_uverbs_close,
996 .llseek = no_llseek,
997 .unlocked_ioctl = ib_uverbs_ioctl,
998 .compat_ioctl = compat_ptr_ioctl,
999};
1000
1001static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1002 struct ib_client_nl_info *res)
1003{
1004 struct ib_uverbs_device *uverbs_dev = client_data;
1005 int ret;
1006
1007 if (res->port != -1)
1008 return -EINVAL;
1009
1010 res->abi = ibdev->ops.uverbs_abi_ver;
1011 res->cdev = &uverbs_dev->dev;
1012
1013 /*
1014 * To support DRIVER_ID binding in userspace some of the driver need
1015 * upgrading to expose their PCI dependent revision information
1016 * through get_context instead of relying on modalias matching. When
1017 * the drivers are fixed they can drop this flag.
1018 */
1019 if (!ibdev->ops.uverbs_no_driver_id_binding) {
1020 ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1021 ibdev->ops.driver_id);
1022 if (ret)
1023 return ret;
1024 }
1025 return 0;
1026}
1027
1028static struct ib_client uverbs_client = {
1029 .name = "uverbs",
1030 .no_kverbs_req = true,
1031 .add = ib_uverbs_add_one,
1032 .remove = ib_uverbs_remove_one,
1033 .get_nl_info = ib_uverbs_get_nl_info,
1034};
1035MODULE_ALIAS_RDMA_CLIENT("uverbs");
1036
1037static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1038 char *buf)
1039{
1040 struct ib_uverbs_device *dev =
1041 container_of(device, struct ib_uverbs_device, dev);
1042 int ret = -ENODEV;
1043 int srcu_key;
1044 struct ib_device *ib_dev;
1045
1046 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1047 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1048 if (ib_dev)
1049 ret = sprintf(buf, "%s\n", dev_name(&ib_dev->dev));
1050 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1051
1052 return ret;
1053}
1054static DEVICE_ATTR_RO(ibdev);
1055
1056static ssize_t abi_version_show(struct device *device,
1057 struct device_attribute *attr, char *buf)
1058{
1059 struct ib_uverbs_device *dev =
1060 container_of(device, struct ib_uverbs_device, dev);
1061 int ret = -ENODEV;
1062 int srcu_key;
1063 struct ib_device *ib_dev;
1064
1065 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1066 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1067 if (ib_dev)
1068 ret = sprintf(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1069 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1070
1071 return ret;
1072}
1073static DEVICE_ATTR_RO(abi_version);
1074
1075static struct attribute *ib_dev_attrs[] = {
1076 &dev_attr_abi_version.attr,
1077 &dev_attr_ibdev.attr,
1078 NULL,
1079};
1080
1081static const struct attribute_group dev_attr_group = {
1082 .attrs = ib_dev_attrs,
1083};
1084
1085static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1086 __stringify(IB_USER_VERBS_ABI_VERSION));
1087
1088static int ib_uverbs_create_uapi(struct ib_device *device,
1089 struct ib_uverbs_device *uverbs_dev)
1090{
1091 struct uverbs_api *uapi;
1092
1093 uapi = uverbs_alloc_api(device);
1094 if (IS_ERR(uapi))
1095 return PTR_ERR(uapi);
1096
1097 uverbs_dev->uapi = uapi;
1098 return 0;
1099}
1100
1101static int ib_uverbs_add_one(struct ib_device *device)
1102{
1103 int devnum;
1104 dev_t base;
1105 struct ib_uverbs_device *uverbs_dev;
1106 int ret;
1107
1108 if (!device->ops.alloc_ucontext)
1109 return -EOPNOTSUPP;
1110
1111 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1112 if (!uverbs_dev)
1113 return -ENOMEM;
1114
1115 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1116 if (ret) {
1117 kfree(uverbs_dev);
1118 return -ENOMEM;
1119 }
1120
1121 device_initialize(&uverbs_dev->dev);
1122 uverbs_dev->dev.class = uverbs_class;
1123 uverbs_dev->dev.parent = device->dev.parent;
1124 uverbs_dev->dev.release = ib_uverbs_release_dev;
1125 uverbs_dev->groups[0] = &dev_attr_group;
1126 uverbs_dev->dev.groups = uverbs_dev->groups;
1127 atomic_set(&uverbs_dev->refcount, 1);
1128 init_completion(&uverbs_dev->comp);
1129 uverbs_dev->xrcd_tree = RB_ROOT;
1130 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1131 mutex_init(&uverbs_dev->lists_mutex);
1132 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1133 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1134 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1135
1136 devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1137 GFP_KERNEL);
1138 if (devnum < 0) {
1139 ret = -ENOMEM;
1140 goto err;
1141 }
1142 uverbs_dev->devnum = devnum;
1143 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1144 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1145 else
1146 base = IB_UVERBS_BASE_DEV + devnum;
1147
1148 ret = ib_uverbs_create_uapi(device, uverbs_dev);
1149 if (ret)
1150 goto err_uapi;
1151
1152 uverbs_dev->dev.devt = base;
1153 dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1154
1155 cdev_init(&uverbs_dev->cdev,
1156 device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1157 uverbs_dev->cdev.owner = THIS_MODULE;
1158
1159 ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1160 if (ret)
1161 goto err_uapi;
1162
1163 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1164 return 0;
1165
1166err_uapi:
1167 ida_free(&uverbs_ida, devnum);
1168err:
1169 if (atomic_dec_and_test(&uverbs_dev->refcount))
1170 ib_uverbs_comp_dev(uverbs_dev);
1171 wait_for_completion(&uverbs_dev->comp);
1172 put_device(&uverbs_dev->dev);
1173 return ret;
1174}
1175
1176static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1177 struct ib_device *ib_dev)
1178{
1179 struct ib_uverbs_file *file;
1180
1181 /* Pending running commands to terminate */
1182 uverbs_disassociate_api_pre(uverbs_dev);
1183
1184 mutex_lock(&uverbs_dev->lists_mutex);
1185 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1186 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1187 struct ib_uverbs_file, list);
1188 list_del_init(&file->list);
1189 kref_get(&file->ref);
1190
1191 /* We must release the mutex before going ahead and calling
1192 * uverbs_cleanup_ufile, as it might end up indirectly calling
1193 * uverbs_close, for example due to freeing the resources (e.g
1194 * mmput).
1195 */
1196 mutex_unlock(&uverbs_dev->lists_mutex);
1197
1198 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1199 kref_put(&file->ref, ib_uverbs_release_file);
1200
1201 mutex_lock(&uverbs_dev->lists_mutex);
1202 }
1203 mutex_unlock(&uverbs_dev->lists_mutex);
1204
1205 uverbs_disassociate_api(uverbs_dev->uapi);
1206}
1207
1208static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1209{
1210 struct ib_uverbs_device *uverbs_dev = client_data;
1211 int wait_clients = 1;
1212
1213 cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1214 ida_free(&uverbs_ida, uverbs_dev->devnum);
1215
1216 if (device->ops.disassociate_ucontext) {
1217 /* We disassociate HW resources and immediately return.
1218 * Userspace will see a EIO errno for all future access.
1219 * Upon returning, ib_device may be freed internally and is not
1220 * valid any more.
1221 * uverbs_device is still available until all clients close
1222 * their files, then the uverbs device ref count will be zero
1223 * and its resources will be freed.
1224 * Note: At this point no more files can be opened since the
1225 * cdev was deleted, however active clients can still issue
1226 * commands and close their open files.
1227 */
1228 ib_uverbs_free_hw_resources(uverbs_dev, device);
1229 wait_clients = 0;
1230 }
1231
1232 if (atomic_dec_and_test(&uverbs_dev->refcount))
1233 ib_uverbs_comp_dev(uverbs_dev);
1234 if (wait_clients)
1235 wait_for_completion(&uverbs_dev->comp);
1236
1237 put_device(&uverbs_dev->dev);
1238}
1239
1240static char *uverbs_devnode(struct device *dev, umode_t *mode)
1241{
1242 if (mode)
1243 *mode = 0666;
1244 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1245}
1246
1247static int __init ib_uverbs_init(void)
1248{
1249 int ret;
1250
1251 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1252 IB_UVERBS_NUM_FIXED_MINOR,
1253 "infiniband_verbs");
1254 if (ret) {
1255 pr_err("user_verbs: couldn't register device number\n");
1256 goto out;
1257 }
1258
1259 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1260 IB_UVERBS_NUM_DYNAMIC_MINOR,
1261 "infiniband_verbs");
1262 if (ret) {
1263 pr_err("couldn't register dynamic device number\n");
1264 goto out_alloc;
1265 }
1266
1267 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1268 if (IS_ERR(uverbs_class)) {
1269 ret = PTR_ERR(uverbs_class);
1270 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1271 goto out_chrdev;
1272 }
1273
1274 uverbs_class->devnode = uverbs_devnode;
1275
1276 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1277 if (ret) {
1278 pr_err("user_verbs: couldn't create abi_version attribute\n");
1279 goto out_class;
1280 }
1281
1282 ret = ib_register_client(&uverbs_client);
1283 if (ret) {
1284 pr_err("user_verbs: couldn't register client\n");
1285 goto out_class;
1286 }
1287
1288 return 0;
1289
1290out_class:
1291 class_destroy(uverbs_class);
1292
1293out_chrdev:
1294 unregister_chrdev_region(dynamic_uverbs_dev,
1295 IB_UVERBS_NUM_DYNAMIC_MINOR);
1296
1297out_alloc:
1298 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1299 IB_UVERBS_NUM_FIXED_MINOR);
1300
1301out:
1302 return ret;
1303}
1304
1305static void __exit ib_uverbs_cleanup(void)
1306{
1307 ib_unregister_client(&uverbs_client);
1308 class_destroy(uverbs_class);
1309 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1310 IB_UVERBS_NUM_FIXED_MINOR);
1311 unregister_chrdev_region(dynamic_uverbs_dev,
1312 IB_UVERBS_NUM_DYNAMIC_MINOR);
1313 mmu_notifier_synchronize();
1314}
1315
1316module_init(ib_uverbs_init);
1317module_exit(ib_uverbs_cleanup);