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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
49#include <asm/uaccess.h>
50
51#include <rdma/ib.h>
52
53#include "uverbs.h"
54
55MODULE_AUTHOR("Roland Dreier");
56MODULE_DESCRIPTION("InfiniBand userspace verbs access");
57MODULE_LICENSE("Dual BSD/GPL");
58
59enum {
60 IB_UVERBS_MAJOR = 231,
61 IB_UVERBS_BASE_MINOR = 192,
62 IB_UVERBS_MAX_DEVICES = 32
63};
64
65#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
66
67static struct class *uverbs_class;
68
69DEFINE_SPINLOCK(ib_uverbs_idr_lock);
70DEFINE_IDR(ib_uverbs_pd_idr);
71DEFINE_IDR(ib_uverbs_mr_idr);
72DEFINE_IDR(ib_uverbs_mw_idr);
73DEFINE_IDR(ib_uverbs_ah_idr);
74DEFINE_IDR(ib_uverbs_cq_idr);
75DEFINE_IDR(ib_uverbs_qp_idr);
76DEFINE_IDR(ib_uverbs_srq_idr);
77DEFINE_IDR(ib_uverbs_xrcd_idr);
78DEFINE_IDR(ib_uverbs_rule_idr);
79
80static DEFINE_SPINLOCK(map_lock);
81static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
82
83static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
84 struct ib_device *ib_dev,
85 const char __user *buf, int in_len,
86 int out_len) = {
87 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
88 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
89 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
90 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
91 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
92 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
93 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr,
94 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
95 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
96 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
97 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
98 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
99 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
100 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
101 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
102 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
103 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
104 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
105 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
106 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
107 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
108 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
109 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
110 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
111 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
112 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
113 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
114 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
115 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
116 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
117 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
118 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
119 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
120 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
121 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
122};
123
124static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
125 struct ib_device *ib_dev,
126 struct ib_udata *ucore,
127 struct ib_udata *uhw) = {
128 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
129 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
130 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device,
131 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq,
132 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp,
133};
134
135static void ib_uverbs_add_one(struct ib_device *device);
136static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
137
138int uverbs_dealloc_mw(struct ib_mw *mw)
139{
140 struct ib_pd *pd = mw->pd;
141 int ret;
142
143 ret = mw->device->dealloc_mw(mw);
144 if (!ret)
145 atomic_dec(&pd->usecnt);
146 return ret;
147}
148
149static void ib_uverbs_release_dev(struct kobject *kobj)
150{
151 struct ib_uverbs_device *dev =
152 container_of(kobj, struct ib_uverbs_device, kobj);
153
154 cleanup_srcu_struct(&dev->disassociate_srcu);
155 kfree(dev);
156}
157
158static struct kobj_type ib_uverbs_dev_ktype = {
159 .release = ib_uverbs_release_dev,
160};
161
162static void ib_uverbs_release_event_file(struct kref *ref)
163{
164 struct ib_uverbs_event_file *file =
165 container_of(ref, struct ib_uverbs_event_file, ref);
166
167 kfree(file);
168}
169
170void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
171 struct ib_uverbs_event_file *ev_file,
172 struct ib_ucq_object *uobj)
173{
174 struct ib_uverbs_event *evt, *tmp;
175
176 if (ev_file) {
177 spin_lock_irq(&ev_file->lock);
178 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
179 list_del(&evt->list);
180 kfree(evt);
181 }
182 spin_unlock_irq(&ev_file->lock);
183
184 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
185 }
186
187 spin_lock_irq(&file->async_file->lock);
188 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
189 list_del(&evt->list);
190 kfree(evt);
191 }
192 spin_unlock_irq(&file->async_file->lock);
193}
194
195void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
196 struct ib_uevent_object *uobj)
197{
198 struct ib_uverbs_event *evt, *tmp;
199
200 spin_lock_irq(&file->async_file->lock);
201 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
202 list_del(&evt->list);
203 kfree(evt);
204 }
205 spin_unlock_irq(&file->async_file->lock);
206}
207
208static void ib_uverbs_detach_umcast(struct ib_qp *qp,
209 struct ib_uqp_object *uobj)
210{
211 struct ib_uverbs_mcast_entry *mcast, *tmp;
212
213 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
214 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
215 list_del(&mcast->list);
216 kfree(mcast);
217 }
218}
219
220static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
221 struct ib_ucontext *context)
222{
223 struct ib_uobject *uobj, *tmp;
224
225 context->closing = 1;
226
227 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
228 struct ib_ah *ah = uobj->object;
229
230 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
231 ib_destroy_ah(ah);
232 kfree(uobj);
233 }
234
235 /* Remove MWs before QPs, in order to support type 2A MWs. */
236 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
237 struct ib_mw *mw = uobj->object;
238
239 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
240 uverbs_dealloc_mw(mw);
241 kfree(uobj);
242 }
243
244 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
245 struct ib_flow *flow_id = uobj->object;
246
247 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
248 ib_destroy_flow(flow_id);
249 kfree(uobj);
250 }
251
252 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
253 struct ib_qp *qp = uobj->object;
254 struct ib_uqp_object *uqp =
255 container_of(uobj, struct ib_uqp_object, uevent.uobject);
256
257 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
258 if (qp != qp->real_qp) {
259 ib_close_qp(qp);
260 } else {
261 ib_uverbs_detach_umcast(qp, uqp);
262 ib_destroy_qp(qp);
263 }
264 ib_uverbs_release_uevent(file, &uqp->uevent);
265 kfree(uqp);
266 }
267
268 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
269 struct ib_srq *srq = uobj->object;
270 struct ib_uevent_object *uevent =
271 container_of(uobj, struct ib_uevent_object, uobject);
272
273 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
274 ib_destroy_srq(srq);
275 ib_uverbs_release_uevent(file, uevent);
276 kfree(uevent);
277 }
278
279 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
280 struct ib_cq *cq = uobj->object;
281 struct ib_uverbs_event_file *ev_file = cq->cq_context;
282 struct ib_ucq_object *ucq =
283 container_of(uobj, struct ib_ucq_object, uobject);
284
285 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
286 ib_destroy_cq(cq);
287 ib_uverbs_release_ucq(file, ev_file, ucq);
288 kfree(ucq);
289 }
290
291 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
292 struct ib_mr *mr = uobj->object;
293
294 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
295 ib_dereg_mr(mr);
296 kfree(uobj);
297 }
298
299 mutex_lock(&file->device->xrcd_tree_mutex);
300 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
301 struct ib_xrcd *xrcd = uobj->object;
302 struct ib_uxrcd_object *uxrcd =
303 container_of(uobj, struct ib_uxrcd_object, uobject);
304
305 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
306 ib_uverbs_dealloc_xrcd(file->device, xrcd);
307 kfree(uxrcd);
308 }
309 mutex_unlock(&file->device->xrcd_tree_mutex);
310
311 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
312 struct ib_pd *pd = uobj->object;
313
314 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
315 ib_dealloc_pd(pd);
316 kfree(uobj);
317 }
318
319 put_pid(context->tgid);
320
321 return context->device->dealloc_ucontext(context);
322}
323
324static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
325{
326 complete(&dev->comp);
327}
328
329static void ib_uverbs_release_file(struct kref *ref)
330{
331 struct ib_uverbs_file *file =
332 container_of(ref, struct ib_uverbs_file, ref);
333 struct ib_device *ib_dev;
334 int srcu_key;
335
336 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
337 ib_dev = srcu_dereference(file->device->ib_dev,
338 &file->device->disassociate_srcu);
339 if (ib_dev && !ib_dev->disassociate_ucontext)
340 module_put(ib_dev->owner);
341 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
342
343 if (atomic_dec_and_test(&file->device->refcount))
344 ib_uverbs_comp_dev(file->device);
345
346 kfree(file);
347}
348
349static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
350 size_t count, loff_t *pos)
351{
352 struct ib_uverbs_event_file *file = filp->private_data;
353 struct ib_uverbs_event *event;
354 int eventsz;
355 int ret = 0;
356
357 spin_lock_irq(&file->lock);
358
359 while (list_empty(&file->event_list)) {
360 spin_unlock_irq(&file->lock);
361
362 if (filp->f_flags & O_NONBLOCK)
363 return -EAGAIN;
364
365 if (wait_event_interruptible(file->poll_wait,
366 (!list_empty(&file->event_list) ||
367 /* The barriers built into wait_event_interruptible()
368 * and wake_up() guarentee this will see the null set
369 * without using RCU
370 */
371 !file->uverbs_file->device->ib_dev)))
372 return -ERESTARTSYS;
373
374 /* If device was disassociated and no event exists set an error */
375 if (list_empty(&file->event_list) &&
376 !file->uverbs_file->device->ib_dev)
377 return -EIO;
378
379 spin_lock_irq(&file->lock);
380 }
381
382 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
383
384 if (file->is_async)
385 eventsz = sizeof (struct ib_uverbs_async_event_desc);
386 else
387 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
388
389 if (eventsz > count) {
390 ret = -EINVAL;
391 event = NULL;
392 } else {
393 list_del(file->event_list.next);
394 if (event->counter) {
395 ++(*event->counter);
396 list_del(&event->obj_list);
397 }
398 }
399
400 spin_unlock_irq(&file->lock);
401
402 if (event) {
403 if (copy_to_user(buf, event, eventsz))
404 ret = -EFAULT;
405 else
406 ret = eventsz;
407 }
408
409 kfree(event);
410
411 return ret;
412}
413
414static unsigned int ib_uverbs_event_poll(struct file *filp,
415 struct poll_table_struct *wait)
416{
417 unsigned int pollflags = 0;
418 struct ib_uverbs_event_file *file = filp->private_data;
419
420 poll_wait(filp, &file->poll_wait, wait);
421
422 spin_lock_irq(&file->lock);
423 if (!list_empty(&file->event_list))
424 pollflags = POLLIN | POLLRDNORM;
425 spin_unlock_irq(&file->lock);
426
427 return pollflags;
428}
429
430static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
431{
432 struct ib_uverbs_event_file *file = filp->private_data;
433
434 return fasync_helper(fd, filp, on, &file->async_queue);
435}
436
437static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
438{
439 struct ib_uverbs_event_file *file = filp->private_data;
440 struct ib_uverbs_event *entry, *tmp;
441 int closed_already = 0;
442
443 mutex_lock(&file->uverbs_file->device->lists_mutex);
444 spin_lock_irq(&file->lock);
445 closed_already = file->is_closed;
446 file->is_closed = 1;
447 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
448 if (entry->counter)
449 list_del(&entry->obj_list);
450 kfree(entry);
451 }
452 spin_unlock_irq(&file->lock);
453 if (!closed_already) {
454 list_del(&file->list);
455 if (file->is_async)
456 ib_unregister_event_handler(&file->uverbs_file->
457 event_handler);
458 }
459 mutex_unlock(&file->uverbs_file->device->lists_mutex);
460
461 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
462 kref_put(&file->ref, ib_uverbs_release_event_file);
463
464 return 0;
465}
466
467static const struct file_operations uverbs_event_fops = {
468 .owner = THIS_MODULE,
469 .read = ib_uverbs_event_read,
470 .poll = ib_uverbs_event_poll,
471 .release = ib_uverbs_event_close,
472 .fasync = ib_uverbs_event_fasync,
473 .llseek = no_llseek,
474};
475
476void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
477{
478 struct ib_uverbs_event_file *file = cq_context;
479 struct ib_ucq_object *uobj;
480 struct ib_uverbs_event *entry;
481 unsigned long flags;
482
483 if (!file)
484 return;
485
486 spin_lock_irqsave(&file->lock, flags);
487 if (file->is_closed) {
488 spin_unlock_irqrestore(&file->lock, flags);
489 return;
490 }
491
492 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
493 if (!entry) {
494 spin_unlock_irqrestore(&file->lock, flags);
495 return;
496 }
497
498 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
499
500 entry->desc.comp.cq_handle = cq->uobject->user_handle;
501 entry->counter = &uobj->comp_events_reported;
502
503 list_add_tail(&entry->list, &file->event_list);
504 list_add_tail(&entry->obj_list, &uobj->comp_list);
505 spin_unlock_irqrestore(&file->lock, flags);
506
507 wake_up_interruptible(&file->poll_wait);
508 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
509}
510
511static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
512 __u64 element, __u64 event,
513 struct list_head *obj_list,
514 u32 *counter)
515{
516 struct ib_uverbs_event *entry;
517 unsigned long flags;
518
519 spin_lock_irqsave(&file->async_file->lock, flags);
520 if (file->async_file->is_closed) {
521 spin_unlock_irqrestore(&file->async_file->lock, flags);
522 return;
523 }
524
525 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
526 if (!entry) {
527 spin_unlock_irqrestore(&file->async_file->lock, flags);
528 return;
529 }
530
531 entry->desc.async.element = element;
532 entry->desc.async.event_type = event;
533 entry->desc.async.reserved = 0;
534 entry->counter = counter;
535
536 list_add_tail(&entry->list, &file->async_file->event_list);
537 if (obj_list)
538 list_add_tail(&entry->obj_list, obj_list);
539 spin_unlock_irqrestore(&file->async_file->lock, flags);
540
541 wake_up_interruptible(&file->async_file->poll_wait);
542 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
543}
544
545void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
546{
547 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
548 struct ib_ucq_object, uobject);
549
550 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
551 event->event, &uobj->async_list,
552 &uobj->async_events_reported);
553}
554
555void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
556{
557 struct ib_uevent_object *uobj;
558
559 /* for XRC target qp's, check that qp is live */
560 if (!event->element.qp->uobject || !event->element.qp->uobject->live)
561 return;
562
563 uobj = container_of(event->element.qp->uobject,
564 struct ib_uevent_object, uobject);
565
566 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
567 event->event, &uobj->event_list,
568 &uobj->events_reported);
569}
570
571void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
572{
573 struct ib_uevent_object *uobj;
574
575 uobj = container_of(event->element.srq->uobject,
576 struct ib_uevent_object, uobject);
577
578 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
579 event->event, &uobj->event_list,
580 &uobj->events_reported);
581}
582
583void ib_uverbs_event_handler(struct ib_event_handler *handler,
584 struct ib_event *event)
585{
586 struct ib_uverbs_file *file =
587 container_of(handler, struct ib_uverbs_file, event_handler);
588
589 ib_uverbs_async_handler(file, event->element.port_num, event->event,
590 NULL, NULL);
591}
592
593void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
594{
595 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
596 file->async_file = NULL;
597}
598
599struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
600 struct ib_device *ib_dev,
601 int is_async)
602{
603 struct ib_uverbs_event_file *ev_file;
604 struct file *filp;
605 int ret;
606
607 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
608 if (!ev_file)
609 return ERR_PTR(-ENOMEM);
610
611 kref_init(&ev_file->ref);
612 spin_lock_init(&ev_file->lock);
613 INIT_LIST_HEAD(&ev_file->event_list);
614 init_waitqueue_head(&ev_file->poll_wait);
615 ev_file->uverbs_file = uverbs_file;
616 kref_get(&ev_file->uverbs_file->ref);
617 ev_file->async_queue = NULL;
618 ev_file->is_closed = 0;
619
620 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
621 ev_file, O_RDONLY);
622 if (IS_ERR(filp))
623 goto err_put_refs;
624
625 mutex_lock(&uverbs_file->device->lists_mutex);
626 list_add_tail(&ev_file->list,
627 &uverbs_file->device->uverbs_events_file_list);
628 mutex_unlock(&uverbs_file->device->lists_mutex);
629
630 if (is_async) {
631 WARN_ON(uverbs_file->async_file);
632 uverbs_file->async_file = ev_file;
633 kref_get(&uverbs_file->async_file->ref);
634 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
635 ib_dev,
636 ib_uverbs_event_handler);
637 ret = ib_register_event_handler(&uverbs_file->event_handler);
638 if (ret)
639 goto err_put_file;
640
641 /* At that point async file stuff was fully set */
642 ev_file->is_async = 1;
643 }
644
645 return filp;
646
647err_put_file:
648 fput(filp);
649 kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
650 uverbs_file->async_file = NULL;
651 return ERR_PTR(ret);
652
653err_put_refs:
654 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
655 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
656 return filp;
657}
658
659/*
660 * Look up a completion event file by FD. If lookup is successful,
661 * takes a ref to the event file struct that it returns; if
662 * unsuccessful, returns NULL.
663 */
664struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
665{
666 struct ib_uverbs_event_file *ev_file = NULL;
667 struct fd f = fdget(fd);
668
669 if (!f.file)
670 return NULL;
671
672 if (f.file->f_op != &uverbs_event_fops)
673 goto out;
674
675 ev_file = f.file->private_data;
676 if (ev_file->is_async) {
677 ev_file = NULL;
678 goto out;
679 }
680
681 kref_get(&ev_file->ref);
682
683out:
684 fdput(f);
685 return ev_file;
686}
687
688static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
689{
690 u64 mask;
691
692 if (command <= IB_USER_VERBS_CMD_OPEN_QP)
693 mask = ib_dev->uverbs_cmd_mask;
694 else
695 mask = ib_dev->uverbs_ex_cmd_mask;
696
697 if (mask & ((u64)1 << command))
698 return 0;
699
700 return -1;
701}
702
703static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
704 size_t count, loff_t *pos)
705{
706 struct ib_uverbs_file *file = filp->private_data;
707 struct ib_device *ib_dev;
708 struct ib_uverbs_cmd_hdr hdr;
709 __u32 command;
710 __u32 flags;
711 int srcu_key;
712 ssize_t ret;
713
714 if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
715 return -EACCES;
716
717 if (count < sizeof hdr)
718 return -EINVAL;
719
720 if (copy_from_user(&hdr, buf, sizeof hdr))
721 return -EFAULT;
722
723 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
724 ib_dev = srcu_dereference(file->device->ib_dev,
725 &file->device->disassociate_srcu);
726 if (!ib_dev) {
727 ret = -EIO;
728 goto out;
729 }
730
731 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
732 IB_USER_VERBS_CMD_COMMAND_MASK)) {
733 ret = -EINVAL;
734 goto out;
735 }
736
737 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
738 if (verify_command_mask(ib_dev, command)) {
739 ret = -EOPNOTSUPP;
740 goto out;
741 }
742
743 if (!file->ucontext &&
744 command != IB_USER_VERBS_CMD_GET_CONTEXT) {
745 ret = -EINVAL;
746 goto out;
747 }
748
749 flags = (hdr.command &
750 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
751
752 if (!flags) {
753 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
754 !uverbs_cmd_table[command]) {
755 ret = -EINVAL;
756 goto out;
757 }
758
759 if (hdr.in_words * 4 != count) {
760 ret = -EINVAL;
761 goto out;
762 }
763
764 ret = uverbs_cmd_table[command](file, ib_dev,
765 buf + sizeof(hdr),
766 hdr.in_words * 4,
767 hdr.out_words * 4);
768
769 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
770 struct ib_uverbs_ex_cmd_hdr ex_hdr;
771 struct ib_udata ucore;
772 struct ib_udata uhw;
773 size_t written_count = count;
774
775 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
776 !uverbs_ex_cmd_table[command]) {
777 ret = -ENOSYS;
778 goto out;
779 }
780
781 if (!file->ucontext) {
782 ret = -EINVAL;
783 goto out;
784 }
785
786 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
787 ret = -EINVAL;
788 goto out;
789 }
790
791 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
792 ret = -EFAULT;
793 goto out;
794 }
795
796 count -= sizeof(hdr) + sizeof(ex_hdr);
797 buf += sizeof(hdr) + sizeof(ex_hdr);
798
799 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
800 ret = -EINVAL;
801 goto out;
802 }
803
804 if (ex_hdr.cmd_hdr_reserved) {
805 ret = -EINVAL;
806 goto out;
807 }
808
809 if (ex_hdr.response) {
810 if (!hdr.out_words && !ex_hdr.provider_out_words) {
811 ret = -EINVAL;
812 goto out;
813 }
814
815 if (!access_ok(VERIFY_WRITE,
816 (void __user *) (unsigned long) ex_hdr.response,
817 (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
818 ret = -EFAULT;
819 goto out;
820 }
821 } else {
822 if (hdr.out_words || ex_hdr.provider_out_words) {
823 ret = -EINVAL;
824 goto out;
825 }
826 }
827
828 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
829 hdr.in_words * 8, hdr.out_words * 8);
830
831 INIT_UDATA_BUF_OR_NULL(&uhw,
832 buf + ucore.inlen,
833 (unsigned long) ex_hdr.response + ucore.outlen,
834 ex_hdr.provider_in_words * 8,
835 ex_hdr.provider_out_words * 8);
836
837 ret = uverbs_ex_cmd_table[command](file,
838 ib_dev,
839 &ucore,
840 &uhw);
841 if (!ret)
842 ret = written_count;
843 } else {
844 ret = -ENOSYS;
845 }
846
847out:
848 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
849 return ret;
850}
851
852static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
853{
854 struct ib_uverbs_file *file = filp->private_data;
855 struct ib_device *ib_dev;
856 int ret = 0;
857 int srcu_key;
858
859 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
860 ib_dev = srcu_dereference(file->device->ib_dev,
861 &file->device->disassociate_srcu);
862 if (!ib_dev) {
863 ret = -EIO;
864 goto out;
865 }
866
867 if (!file->ucontext)
868 ret = -ENODEV;
869 else
870 ret = ib_dev->mmap(file->ucontext, vma);
871out:
872 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
873 return ret;
874}
875
876/*
877 * ib_uverbs_open() does not need the BKL:
878 *
879 * - the ib_uverbs_device structures are properly reference counted and
880 * everything else is purely local to the file being created, so
881 * races against other open calls are not a problem;
882 * - there is no ioctl method to race against;
883 * - the open method will either immediately run -ENXIO, or all
884 * required initialization will be done.
885 */
886static int ib_uverbs_open(struct inode *inode, struct file *filp)
887{
888 struct ib_uverbs_device *dev;
889 struct ib_uverbs_file *file;
890 struct ib_device *ib_dev;
891 int ret;
892 int module_dependent;
893 int srcu_key;
894
895 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
896 if (!atomic_inc_not_zero(&dev->refcount))
897 return -ENXIO;
898
899 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
900 mutex_lock(&dev->lists_mutex);
901 ib_dev = srcu_dereference(dev->ib_dev,
902 &dev->disassociate_srcu);
903 if (!ib_dev) {
904 ret = -EIO;
905 goto err;
906 }
907
908 /* In case IB device supports disassociate ucontext, there is no hard
909 * dependency between uverbs device and its low level device.
910 */
911 module_dependent = !(ib_dev->disassociate_ucontext);
912
913 if (module_dependent) {
914 if (!try_module_get(ib_dev->owner)) {
915 ret = -ENODEV;
916 goto err;
917 }
918 }
919
920 file = kzalloc(sizeof(*file), GFP_KERNEL);
921 if (!file) {
922 ret = -ENOMEM;
923 if (module_dependent)
924 goto err_module;
925
926 goto err;
927 }
928
929 file->device = dev;
930 file->ucontext = NULL;
931 file->async_file = NULL;
932 kref_init(&file->ref);
933 mutex_init(&file->mutex);
934
935 filp->private_data = file;
936 kobject_get(&dev->kobj);
937 list_add_tail(&file->list, &dev->uverbs_file_list);
938 mutex_unlock(&dev->lists_mutex);
939 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
940
941 return nonseekable_open(inode, filp);
942
943err_module:
944 module_put(ib_dev->owner);
945
946err:
947 mutex_unlock(&dev->lists_mutex);
948 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
949 if (atomic_dec_and_test(&dev->refcount))
950 ib_uverbs_comp_dev(dev);
951
952 return ret;
953}
954
955static int ib_uverbs_close(struct inode *inode, struct file *filp)
956{
957 struct ib_uverbs_file *file = filp->private_data;
958 struct ib_uverbs_device *dev = file->device;
959 struct ib_ucontext *ucontext = NULL;
960
961 mutex_lock(&file->device->lists_mutex);
962 ucontext = file->ucontext;
963 file->ucontext = NULL;
964 if (!file->is_closed) {
965 list_del(&file->list);
966 file->is_closed = 1;
967 }
968 mutex_unlock(&file->device->lists_mutex);
969 if (ucontext)
970 ib_uverbs_cleanup_ucontext(file, ucontext);
971
972 if (file->async_file)
973 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
974
975 kref_put(&file->ref, ib_uverbs_release_file);
976 kobject_put(&dev->kobj);
977
978 return 0;
979}
980
981static const struct file_operations uverbs_fops = {
982 .owner = THIS_MODULE,
983 .write = ib_uverbs_write,
984 .open = ib_uverbs_open,
985 .release = ib_uverbs_close,
986 .llseek = no_llseek,
987};
988
989static const struct file_operations uverbs_mmap_fops = {
990 .owner = THIS_MODULE,
991 .write = ib_uverbs_write,
992 .mmap = ib_uverbs_mmap,
993 .open = ib_uverbs_open,
994 .release = ib_uverbs_close,
995 .llseek = no_llseek,
996};
997
998static struct ib_client uverbs_client = {
999 .name = "uverbs",
1000 .add = ib_uverbs_add_one,
1001 .remove = ib_uverbs_remove_one
1002};
1003
1004static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1005 char *buf)
1006{
1007 int ret = -ENODEV;
1008 int srcu_key;
1009 struct ib_uverbs_device *dev = dev_get_drvdata(device);
1010 struct ib_device *ib_dev;
1011
1012 if (!dev)
1013 return -ENODEV;
1014
1015 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1016 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1017 if (ib_dev)
1018 ret = sprintf(buf, "%s\n", ib_dev->name);
1019 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1020
1021 return ret;
1022}
1023static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1024
1025static ssize_t show_dev_abi_version(struct device *device,
1026 struct device_attribute *attr, char *buf)
1027{
1028 struct ib_uverbs_device *dev = dev_get_drvdata(device);
1029 int ret = -ENODEV;
1030 int srcu_key;
1031 struct ib_device *ib_dev;
1032
1033 if (!dev)
1034 return -ENODEV;
1035 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1036 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1037 if (ib_dev)
1038 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1039 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1040
1041 return ret;
1042}
1043static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1044
1045static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1046 __stringify(IB_USER_VERBS_ABI_VERSION));
1047
1048static dev_t overflow_maj;
1049static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1050
1051/*
1052 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1053 * requesting a new major number and doubling the number of max devices we
1054 * support. It's stupid, but simple.
1055 */
1056static int find_overflow_devnum(void)
1057{
1058 int ret;
1059
1060 if (!overflow_maj) {
1061 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1062 "infiniband_verbs");
1063 if (ret) {
1064 pr_err("user_verbs: couldn't register dynamic device number\n");
1065 return ret;
1066 }
1067 }
1068
1069 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1070 if (ret >= IB_UVERBS_MAX_DEVICES)
1071 return -1;
1072
1073 return ret;
1074}
1075
1076static void ib_uverbs_add_one(struct ib_device *device)
1077{
1078 int devnum;
1079 dev_t base;
1080 struct ib_uverbs_device *uverbs_dev;
1081 int ret;
1082
1083 if (!device->alloc_ucontext)
1084 return;
1085
1086 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1087 if (!uverbs_dev)
1088 return;
1089
1090 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1091 if (ret) {
1092 kfree(uverbs_dev);
1093 return;
1094 }
1095
1096 atomic_set(&uverbs_dev->refcount, 1);
1097 init_completion(&uverbs_dev->comp);
1098 uverbs_dev->xrcd_tree = RB_ROOT;
1099 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1100 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1101 mutex_init(&uverbs_dev->lists_mutex);
1102 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1103 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1104
1105 spin_lock(&map_lock);
1106 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1107 if (devnum >= IB_UVERBS_MAX_DEVICES) {
1108 spin_unlock(&map_lock);
1109 devnum = find_overflow_devnum();
1110 if (devnum < 0)
1111 goto err;
1112
1113 spin_lock(&map_lock);
1114 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1115 base = devnum + overflow_maj;
1116 set_bit(devnum, overflow_map);
1117 } else {
1118 uverbs_dev->devnum = devnum;
1119 base = devnum + IB_UVERBS_BASE_DEV;
1120 set_bit(devnum, dev_map);
1121 }
1122 spin_unlock(&map_lock);
1123
1124 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1125 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1126
1127 cdev_init(&uverbs_dev->cdev, NULL);
1128 uverbs_dev->cdev.owner = THIS_MODULE;
1129 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1130 uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1131 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1132 if (cdev_add(&uverbs_dev->cdev, base, 1))
1133 goto err_cdev;
1134
1135 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1136 uverbs_dev->cdev.dev, uverbs_dev,
1137 "uverbs%d", uverbs_dev->devnum);
1138 if (IS_ERR(uverbs_dev->dev))
1139 goto err_cdev;
1140
1141 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1142 goto err_class;
1143 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1144 goto err_class;
1145
1146 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1147
1148 return;
1149
1150err_class:
1151 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1152
1153err_cdev:
1154 cdev_del(&uverbs_dev->cdev);
1155 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1156 clear_bit(devnum, dev_map);
1157 else
1158 clear_bit(devnum, overflow_map);
1159
1160err:
1161 if (atomic_dec_and_test(&uverbs_dev->refcount))
1162 ib_uverbs_comp_dev(uverbs_dev);
1163 wait_for_completion(&uverbs_dev->comp);
1164 kobject_put(&uverbs_dev->kobj);
1165 return;
1166}
1167
1168static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1169 struct ib_device *ib_dev)
1170{
1171 struct ib_uverbs_file *file;
1172 struct ib_uverbs_event_file *event_file;
1173 struct ib_event event;
1174
1175 /* Pending running commands to terminate */
1176 synchronize_srcu(&uverbs_dev->disassociate_srcu);
1177 event.event = IB_EVENT_DEVICE_FATAL;
1178 event.element.port_num = 0;
1179 event.device = ib_dev;
1180
1181 mutex_lock(&uverbs_dev->lists_mutex);
1182 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1183 struct ib_ucontext *ucontext;
1184
1185 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1186 struct ib_uverbs_file, list);
1187 file->is_closed = 1;
1188 ucontext = file->ucontext;
1189 list_del(&file->list);
1190 file->ucontext = NULL;
1191 kref_get(&file->ref);
1192 mutex_unlock(&uverbs_dev->lists_mutex);
1193 /* We must release the mutex before going ahead and calling
1194 * disassociate_ucontext. disassociate_ucontext might end up
1195 * indirectly calling uverbs_close, for example due to freeing
1196 * the resources (e.g mmput).
1197 */
1198 ib_uverbs_event_handler(&file->event_handler, &event);
1199 if (ucontext) {
1200 ib_dev->disassociate_ucontext(ucontext);
1201 ib_uverbs_cleanup_ucontext(file, ucontext);
1202 }
1203
1204 mutex_lock(&uverbs_dev->lists_mutex);
1205 kref_put(&file->ref, ib_uverbs_release_file);
1206 }
1207
1208 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1209 event_file = list_first_entry(&uverbs_dev->
1210 uverbs_events_file_list,
1211 struct ib_uverbs_event_file,
1212 list);
1213 spin_lock_irq(&event_file->lock);
1214 event_file->is_closed = 1;
1215 spin_unlock_irq(&event_file->lock);
1216
1217 list_del(&event_file->list);
1218 if (event_file->is_async) {
1219 ib_unregister_event_handler(&event_file->uverbs_file->
1220 event_handler);
1221 event_file->uverbs_file->event_handler.device = NULL;
1222 }
1223
1224 wake_up_interruptible(&event_file->poll_wait);
1225 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1226 }
1227 mutex_unlock(&uverbs_dev->lists_mutex);
1228}
1229
1230static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1231{
1232 struct ib_uverbs_device *uverbs_dev = client_data;
1233 int wait_clients = 1;
1234
1235 if (!uverbs_dev)
1236 return;
1237
1238 dev_set_drvdata(uverbs_dev->dev, NULL);
1239 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1240 cdev_del(&uverbs_dev->cdev);
1241
1242 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1243 clear_bit(uverbs_dev->devnum, dev_map);
1244 else
1245 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1246
1247 if (device->disassociate_ucontext) {
1248 /* We disassociate HW resources and immediately return.
1249 * Userspace will see a EIO errno for all future access.
1250 * Upon returning, ib_device may be freed internally and is not
1251 * valid any more.
1252 * uverbs_device is still available until all clients close
1253 * their files, then the uverbs device ref count will be zero
1254 * and its resources will be freed.
1255 * Note: At this point no more files can be opened since the
1256 * cdev was deleted, however active clients can still issue
1257 * commands and close their open files.
1258 */
1259 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1260 ib_uverbs_free_hw_resources(uverbs_dev, device);
1261 wait_clients = 0;
1262 }
1263
1264 if (atomic_dec_and_test(&uverbs_dev->refcount))
1265 ib_uverbs_comp_dev(uverbs_dev);
1266 if (wait_clients)
1267 wait_for_completion(&uverbs_dev->comp);
1268 kobject_put(&uverbs_dev->kobj);
1269}
1270
1271static char *uverbs_devnode(struct device *dev, umode_t *mode)
1272{
1273 if (mode)
1274 *mode = 0666;
1275 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1276}
1277
1278static int __init ib_uverbs_init(void)
1279{
1280 int ret;
1281
1282 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1283 "infiniband_verbs");
1284 if (ret) {
1285 pr_err("user_verbs: couldn't register device number\n");
1286 goto out;
1287 }
1288
1289 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1290 if (IS_ERR(uverbs_class)) {
1291 ret = PTR_ERR(uverbs_class);
1292 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1293 goto out_chrdev;
1294 }
1295
1296 uverbs_class->devnode = uverbs_devnode;
1297
1298 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1299 if (ret) {
1300 pr_err("user_verbs: couldn't create abi_version attribute\n");
1301 goto out_class;
1302 }
1303
1304 ret = ib_register_client(&uverbs_client);
1305 if (ret) {
1306 pr_err("user_verbs: couldn't register client\n");
1307 goto out_class;
1308 }
1309
1310 return 0;
1311
1312out_class:
1313 class_destroy(uverbs_class);
1314
1315out_chrdev:
1316 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1317
1318out:
1319 return ret;
1320}
1321
1322static void __exit ib_uverbs_cleanup(void)
1323{
1324 ib_unregister_client(&uverbs_client);
1325 class_destroy(uverbs_class);
1326 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1327 if (overflow_maj)
1328 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1329 idr_destroy(&ib_uverbs_pd_idr);
1330 idr_destroy(&ib_uverbs_mr_idr);
1331 idr_destroy(&ib_uverbs_mw_idr);
1332 idr_destroy(&ib_uverbs_ah_idr);
1333 idr_destroy(&ib_uverbs_cq_idr);
1334 idr_destroy(&ib_uverbs_qp_idr);
1335 idr_destroy(&ib_uverbs_srq_idr);
1336}
1337
1338module_init(ib_uverbs_init);
1339module_exit(ib_uverbs_cleanup);