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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 void 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
128static void ib_uverbs_release_async_event_file(struct kref *ref)
129{
130 struct ib_uverbs_async_event_file *file =
131 container_of(ref, struct ib_uverbs_async_event_file, ref);
132
133 kfree(file);
134}
135
136void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
137 struct ib_uverbs_completion_event_file *ev_file,
138 struct ib_ucq_object *uobj)
139{
140 struct ib_uverbs_event *evt, *tmp;
141
142 if (ev_file) {
143 spin_lock_irq(&ev_file->ev_queue.lock);
144 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
145 list_del(&evt->list);
146 kfree(evt);
147 }
148 spin_unlock_irq(&ev_file->ev_queue.lock);
149
150 uverbs_uobject_put(&ev_file->uobj);
151 }
152
153 spin_lock_irq(&file->async_file->ev_queue.lock);
154 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
155 list_del(&evt->list);
156 kfree(evt);
157 }
158 spin_unlock_irq(&file->async_file->ev_queue.lock);
159}
160
161void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
162 struct ib_uevent_object *uobj)
163{
164 struct ib_uverbs_event *evt, *tmp;
165
166 spin_lock_irq(&file->async_file->ev_queue.lock);
167 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
168 list_del(&evt->list);
169 kfree(evt);
170 }
171 spin_unlock_irq(&file->async_file->ev_queue.lock);
172}
173
174void ib_uverbs_detach_umcast(struct ib_qp *qp,
175 struct ib_uqp_object *uobj)
176{
177 struct ib_uverbs_mcast_entry *mcast, *tmp;
178
179 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
180 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
181 list_del(&mcast->list);
182 kfree(mcast);
183 }
184}
185
186static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
187{
188 complete(&dev->comp);
189}
190
191void ib_uverbs_release_file(struct kref *ref)
192{
193 struct ib_uverbs_file *file =
194 container_of(ref, struct ib_uverbs_file, ref);
195 struct ib_device *ib_dev;
196 int srcu_key;
197
198 release_ufile_idr_uobject(file);
199
200 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
201 ib_dev = srcu_dereference(file->device->ib_dev,
202 &file->device->disassociate_srcu);
203 if (ib_dev && !ib_dev->ops.disassociate_ucontext)
204 module_put(ib_dev->ops.owner);
205 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
206
207 if (atomic_dec_and_test(&file->device->refcount))
208 ib_uverbs_comp_dev(file->device);
209
210 if (file->async_file)
211 kref_put(&file->async_file->ref,
212 ib_uverbs_release_async_event_file);
213 put_device(&file->device->dev);
214
215 if (file->disassociate_page)
216 __free_pages(file->disassociate_page, 0);
217 mutex_destroy(&file->umap_lock);
218 mutex_destroy(&file->ucontext_lock);
219 kfree(file);
220}
221
222static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
223 struct ib_uverbs_file *uverbs_file,
224 struct file *filp, char __user *buf,
225 size_t count, loff_t *pos,
226 size_t eventsz)
227{
228 struct ib_uverbs_event *event;
229 int ret = 0;
230
231 spin_lock_irq(&ev_queue->lock);
232
233 while (list_empty(&ev_queue->event_list)) {
234 spin_unlock_irq(&ev_queue->lock);
235
236 if (filp->f_flags & O_NONBLOCK)
237 return -EAGAIN;
238
239 if (wait_event_interruptible(ev_queue->poll_wait,
240 (!list_empty(&ev_queue->event_list) ||
241 /* The barriers built into wait_event_interruptible()
242 * and wake_up() guarentee this will see the null set
243 * without using RCU
244 */
245 !uverbs_file->device->ib_dev)))
246 return -ERESTARTSYS;
247
248 /* If device was disassociated and no event exists set an error */
249 if (list_empty(&ev_queue->event_list) &&
250 !uverbs_file->device->ib_dev)
251 return -EIO;
252
253 spin_lock_irq(&ev_queue->lock);
254 }
255
256 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
257
258 if (eventsz > count) {
259 ret = -EINVAL;
260 event = NULL;
261 } else {
262 list_del(ev_queue->event_list.next);
263 if (event->counter) {
264 ++(*event->counter);
265 list_del(&event->obj_list);
266 }
267 }
268
269 spin_unlock_irq(&ev_queue->lock);
270
271 if (event) {
272 if (copy_to_user(buf, event, eventsz))
273 ret = -EFAULT;
274 else
275 ret = eventsz;
276 }
277
278 kfree(event);
279
280 return ret;
281}
282
283static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
284 size_t count, loff_t *pos)
285{
286 struct ib_uverbs_async_event_file *file = filp->private_data;
287
288 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
289 buf, count, pos,
290 sizeof(struct ib_uverbs_async_event_desc));
291}
292
293static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
294 size_t count, loff_t *pos)
295{
296 struct ib_uverbs_completion_event_file *comp_ev_file =
297 filp->private_data;
298
299 return ib_uverbs_event_read(&comp_ev_file->ev_queue,
300 comp_ev_file->uobj.ufile, filp,
301 buf, count, pos,
302 sizeof(struct ib_uverbs_comp_event_desc));
303}
304
305static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
306 struct file *filp,
307 struct poll_table_struct *wait)
308{
309 __poll_t pollflags = 0;
310
311 poll_wait(filp, &ev_queue->poll_wait, wait);
312
313 spin_lock_irq(&ev_queue->lock);
314 if (!list_empty(&ev_queue->event_list))
315 pollflags = EPOLLIN | EPOLLRDNORM;
316 spin_unlock_irq(&ev_queue->lock);
317
318 return pollflags;
319}
320
321static __poll_t ib_uverbs_async_event_poll(struct file *filp,
322 struct poll_table_struct *wait)
323{
324 return ib_uverbs_event_poll(filp->private_data, filp, wait);
325}
326
327static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
328 struct poll_table_struct *wait)
329{
330 struct ib_uverbs_completion_event_file *comp_ev_file =
331 filp->private_data;
332
333 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
334}
335
336static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
337{
338 struct ib_uverbs_event_queue *ev_queue = filp->private_data;
339
340 return fasync_helper(fd, filp, on, &ev_queue->async_queue);
341}
342
343static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
344{
345 struct ib_uverbs_completion_event_file *comp_ev_file =
346 filp->private_data;
347
348 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
349}
350
351static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
352{
353 struct ib_uverbs_async_event_file *file = filp->private_data;
354 struct ib_uverbs_file *uverbs_file = file->uverbs_file;
355 struct ib_uverbs_event *entry, *tmp;
356 int closed_already = 0;
357
358 mutex_lock(&uverbs_file->device->lists_mutex);
359 spin_lock_irq(&file->ev_queue.lock);
360 closed_already = file->ev_queue.is_closed;
361 file->ev_queue.is_closed = 1;
362 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
363 if (entry->counter)
364 list_del(&entry->obj_list);
365 kfree(entry);
366 }
367 spin_unlock_irq(&file->ev_queue.lock);
368 if (!closed_already) {
369 list_del(&file->list);
370 ib_unregister_event_handler(&uverbs_file->event_handler);
371 }
372 mutex_unlock(&uverbs_file->device->lists_mutex);
373
374 kref_put(&uverbs_file->ref, ib_uverbs_release_file);
375 kref_put(&file->ref, ib_uverbs_release_async_event_file);
376
377 return 0;
378}
379
380static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
381{
382 struct ib_uobject *uobj = filp->private_data;
383 struct ib_uverbs_completion_event_file *file = container_of(
384 uobj, struct ib_uverbs_completion_event_file, uobj);
385 struct ib_uverbs_event *entry, *tmp;
386
387 spin_lock_irq(&file->ev_queue.lock);
388 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
389 if (entry->counter)
390 list_del(&entry->obj_list);
391 kfree(entry);
392 }
393 file->ev_queue.is_closed = 1;
394 spin_unlock_irq(&file->ev_queue.lock);
395
396 uverbs_close_fd(filp);
397
398 return 0;
399}
400
401const struct file_operations uverbs_event_fops = {
402 .owner = THIS_MODULE,
403 .read = ib_uverbs_comp_event_read,
404 .poll = ib_uverbs_comp_event_poll,
405 .release = ib_uverbs_comp_event_close,
406 .fasync = ib_uverbs_comp_event_fasync,
407 .llseek = no_llseek,
408};
409
410static const struct file_operations uverbs_async_event_fops = {
411 .owner = THIS_MODULE,
412 .read = ib_uverbs_async_event_read,
413 .poll = ib_uverbs_async_event_poll,
414 .release = ib_uverbs_async_event_close,
415 .fasync = ib_uverbs_async_event_fasync,
416 .llseek = no_llseek,
417};
418
419void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
420{
421 struct ib_uverbs_event_queue *ev_queue = cq_context;
422 struct ib_ucq_object *uobj;
423 struct ib_uverbs_event *entry;
424 unsigned long flags;
425
426 if (!ev_queue)
427 return;
428
429 spin_lock_irqsave(&ev_queue->lock, flags);
430 if (ev_queue->is_closed) {
431 spin_unlock_irqrestore(&ev_queue->lock, flags);
432 return;
433 }
434
435 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
436 if (!entry) {
437 spin_unlock_irqrestore(&ev_queue->lock, flags);
438 return;
439 }
440
441 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
442
443 entry->desc.comp.cq_handle = cq->uobject->user_handle;
444 entry->counter = &uobj->comp_events_reported;
445
446 list_add_tail(&entry->list, &ev_queue->event_list);
447 list_add_tail(&entry->obj_list, &uobj->comp_list);
448 spin_unlock_irqrestore(&ev_queue->lock, flags);
449
450 wake_up_interruptible(&ev_queue->poll_wait);
451 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
452}
453
454static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
455 __u64 element, __u64 event,
456 struct list_head *obj_list,
457 u32 *counter)
458{
459 struct ib_uverbs_event *entry;
460 unsigned long flags;
461
462 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
463 if (file->async_file->ev_queue.is_closed) {
464 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
465 return;
466 }
467
468 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
469 if (!entry) {
470 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
471 return;
472 }
473
474 entry->desc.async.element = element;
475 entry->desc.async.event_type = event;
476 entry->desc.async.reserved = 0;
477 entry->counter = counter;
478
479 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
480 if (obj_list)
481 list_add_tail(&entry->obj_list, obj_list);
482 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
483
484 wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
485 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
486}
487
488void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
489{
490 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
491 struct ib_ucq_object, uobject);
492
493 ib_uverbs_async_handler(uobj->uobject.ufile, uobj->uobject.user_handle,
494 event->event, &uobj->async_list,
495 &uobj->async_events_reported);
496}
497
498void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
499{
500 struct ib_uevent_object *uobj;
501
502 /* for XRC target qp's, check that qp is live */
503 if (!event->element.qp->uobject)
504 return;
505
506 uobj = container_of(event->element.qp->uobject,
507 struct ib_uevent_object, uobject);
508
509 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
510 event->event, &uobj->event_list,
511 &uobj->events_reported);
512}
513
514void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
515{
516 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
517 struct ib_uevent_object, uobject);
518
519 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
520 event->event, &uobj->event_list,
521 &uobj->events_reported);
522}
523
524void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
525{
526 struct ib_uevent_object *uobj;
527
528 uobj = container_of(event->element.srq->uobject,
529 struct ib_uevent_object, uobject);
530
531 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
532 event->event, &uobj->event_list,
533 &uobj->events_reported);
534}
535
536void ib_uverbs_event_handler(struct ib_event_handler *handler,
537 struct ib_event *event)
538{
539 struct ib_uverbs_file *file =
540 container_of(handler, struct ib_uverbs_file, event_handler);
541
542 ib_uverbs_async_handler(file, event->element.port_num, event->event,
543 NULL, NULL);
544}
545
546void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
547{
548 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
549 file->async_file = NULL;
550}
551
552void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
553{
554 spin_lock_init(&ev_queue->lock);
555 INIT_LIST_HEAD(&ev_queue->event_list);
556 init_waitqueue_head(&ev_queue->poll_wait);
557 ev_queue->is_closed = 0;
558 ev_queue->async_queue = NULL;
559}
560
561struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
562 struct ib_device *ib_dev)
563{
564 struct ib_uverbs_async_event_file *ev_file;
565 struct file *filp;
566
567 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
568 if (!ev_file)
569 return ERR_PTR(-ENOMEM);
570
571 ib_uverbs_init_event_queue(&ev_file->ev_queue);
572 ev_file->uverbs_file = uverbs_file;
573 kref_get(&ev_file->uverbs_file->ref);
574 kref_init(&ev_file->ref);
575 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
576 ev_file, O_RDONLY);
577 if (IS_ERR(filp))
578 goto err_put_refs;
579
580 mutex_lock(&uverbs_file->device->lists_mutex);
581 list_add_tail(&ev_file->list,
582 &uverbs_file->device->uverbs_events_file_list);
583 mutex_unlock(&uverbs_file->device->lists_mutex);
584
585 WARN_ON(uverbs_file->async_file);
586 uverbs_file->async_file = ev_file;
587 kref_get(&uverbs_file->async_file->ref);
588 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
589 ib_dev,
590 ib_uverbs_event_handler);
591 ib_register_event_handler(&uverbs_file->event_handler);
592 /* At that point async file stuff was fully set */
593
594 return filp;
595
596err_put_refs:
597 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
598 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
599 return filp;
600}
601
602static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
603 struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
604 const struct uverbs_api_write_method *method_elm)
605{
606 if (method_elm->is_ex) {
607 count -= sizeof(*hdr) + sizeof(*ex_hdr);
608
609 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
610 return -EINVAL;
611
612 if (hdr->in_words * 8 < method_elm->req_size)
613 return -ENOSPC;
614
615 if (ex_hdr->cmd_hdr_reserved)
616 return -EINVAL;
617
618 if (ex_hdr->response) {
619 if (!hdr->out_words && !ex_hdr->provider_out_words)
620 return -EINVAL;
621
622 if (hdr->out_words * 8 < method_elm->resp_size)
623 return -ENOSPC;
624
625 if (!access_ok(u64_to_user_ptr(ex_hdr->response),
626 (hdr->out_words + ex_hdr->provider_out_words) * 8))
627 return -EFAULT;
628 } else {
629 if (hdr->out_words || ex_hdr->provider_out_words)
630 return -EINVAL;
631 }
632
633 return 0;
634 }
635
636 /* not extended command */
637 if (hdr->in_words * 4 != count)
638 return -EINVAL;
639
640 if (count < method_elm->req_size + sizeof(hdr)) {
641 /*
642 * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
643 * with a 16 byte write instead of 24. Old kernels didn't
644 * check the size so they allowed this. Now that the size is
645 * checked provide a compatibility work around to not break
646 * those userspaces.
647 */
648 if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
649 count == 16) {
650 hdr->in_words = 6;
651 return 0;
652 }
653 return -ENOSPC;
654 }
655 if (hdr->out_words * 4 < method_elm->resp_size)
656 return -ENOSPC;
657
658 return 0;
659}
660
661static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
662 size_t count, loff_t *pos)
663{
664 struct ib_uverbs_file *file = filp->private_data;
665 const struct uverbs_api_write_method *method_elm;
666 struct uverbs_api *uapi = file->device->uapi;
667 struct ib_uverbs_ex_cmd_hdr ex_hdr;
668 struct ib_uverbs_cmd_hdr hdr;
669 struct uverbs_attr_bundle bundle;
670 int srcu_key;
671 ssize_t ret;
672
673 if (!ib_safe_file_access(filp)) {
674 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
675 task_tgid_vnr(current), current->comm);
676 return -EACCES;
677 }
678
679 if (count < sizeof(hdr))
680 return -EINVAL;
681
682 if (copy_from_user(&hdr, buf, sizeof(hdr)))
683 return -EFAULT;
684
685 method_elm = uapi_get_method(uapi, hdr.command);
686 if (IS_ERR(method_elm))
687 return PTR_ERR(method_elm);
688
689 if (method_elm->is_ex) {
690 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
691 return -EINVAL;
692 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
693 return -EFAULT;
694 }
695
696 ret = verify_hdr(&hdr, &ex_hdr, count, method_elm);
697 if (ret)
698 return ret;
699
700 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
701
702 buf += sizeof(hdr);
703
704 memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
705 bundle.ufile = file;
706 bundle.context = NULL; /* only valid if bundle has uobject */
707 if (!method_elm->is_ex) {
708 size_t in_len = hdr.in_words * 4 - sizeof(hdr);
709 size_t out_len = hdr.out_words * 4;
710 u64 response = 0;
711
712 if (method_elm->has_udata) {
713 bundle.driver_udata.inlen =
714 in_len - method_elm->req_size;
715 in_len = method_elm->req_size;
716 if (bundle.driver_udata.inlen)
717 bundle.driver_udata.inbuf = buf + in_len;
718 else
719 bundle.driver_udata.inbuf = NULL;
720 } else {
721 memset(&bundle.driver_udata, 0,
722 sizeof(bundle.driver_udata));
723 }
724
725 if (method_elm->has_resp) {
726 /*
727 * The macros check that if has_resp is set
728 * then the command request structure starts
729 * with a '__aligned u64 response' member.
730 */
731 ret = get_user(response, (const u64 __user *)buf);
732 if (ret)
733 goto out_unlock;
734
735 if (method_elm->has_udata) {
736 bundle.driver_udata.outlen =
737 out_len - method_elm->resp_size;
738 out_len = method_elm->resp_size;
739 if (bundle.driver_udata.outlen)
740 bundle.driver_udata.outbuf =
741 u64_to_user_ptr(response +
742 out_len);
743 else
744 bundle.driver_udata.outbuf = NULL;
745 }
746 } else {
747 bundle.driver_udata.outlen = 0;
748 bundle.driver_udata.outbuf = NULL;
749 }
750
751 ib_uverbs_init_udata_buf_or_null(
752 &bundle.ucore, buf, u64_to_user_ptr(response),
753 in_len, out_len);
754 } else {
755 buf += sizeof(ex_hdr);
756
757 ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
758 u64_to_user_ptr(ex_hdr.response),
759 hdr.in_words * 8, hdr.out_words * 8);
760
761 ib_uverbs_init_udata_buf_or_null(
762 &bundle.driver_udata, buf + bundle.ucore.inlen,
763 u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
764 ex_hdr.provider_in_words * 8,
765 ex_hdr.provider_out_words * 8);
766
767 }
768
769 ret = method_elm->handler(&bundle);
770out_unlock:
771 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
772 return (ret) ? : count;
773}
774
775static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
776{
777 struct ib_uverbs_file *file = filp->private_data;
778 struct ib_ucontext *ucontext;
779 int ret = 0;
780 int srcu_key;
781
782 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
783 ucontext = ib_uverbs_get_ucontext_file(file);
784 if (IS_ERR(ucontext)) {
785 ret = PTR_ERR(ucontext);
786 goto out;
787 }
788
789 ret = ucontext->device->ops.mmap(ucontext, vma);
790out:
791 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
792 return ret;
793}
794
795/*
796 * Each time we map IO memory into user space this keeps track of the mapping.
797 * When the device is hot-unplugged we 'zap' the mmaps in user space to point
798 * to the zero page and allow the hot unplug to proceed.
799 *
800 * This is necessary for cases like PCI physical hot unplug as the actual BAR
801 * memory may vanish after this and access to it from userspace could MCE.
802 *
803 * RDMA drivers supporting disassociation must have their user space designed
804 * to cope in some way with their IO pages going to the zero page.
805 */
806struct rdma_umap_priv {
807 struct vm_area_struct *vma;
808 struct list_head list;
809};
810
811static const struct vm_operations_struct rdma_umap_ops;
812
813static void rdma_umap_priv_init(struct rdma_umap_priv *priv,
814 struct vm_area_struct *vma)
815{
816 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
817
818 priv->vma = vma;
819 vma->vm_private_data = priv;
820 vma->vm_ops = &rdma_umap_ops;
821
822 mutex_lock(&ufile->umap_lock);
823 list_add(&priv->list, &ufile->umaps);
824 mutex_unlock(&ufile->umap_lock);
825}
826
827/*
828 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
829 * struct
830 */
831static void rdma_umap_open(struct vm_area_struct *vma)
832{
833 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
834 struct rdma_umap_priv *opriv = vma->vm_private_data;
835 struct rdma_umap_priv *priv;
836
837 if (!opriv)
838 return;
839
840 /* We are racing with disassociation */
841 if (!down_read_trylock(&ufile->hw_destroy_rwsem))
842 goto out_zap;
843 /*
844 * Disassociation already completed, the VMA should already be zapped.
845 */
846 if (!ufile->ucontext)
847 goto out_unlock;
848
849 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
850 if (!priv)
851 goto out_unlock;
852 rdma_umap_priv_init(priv, vma);
853
854 up_read(&ufile->hw_destroy_rwsem);
855 return;
856
857out_unlock:
858 up_read(&ufile->hw_destroy_rwsem);
859out_zap:
860 /*
861 * We can't allow the VMA to be created with the actual IO pages, that
862 * would break our API contract, and it can't be stopped at this
863 * point, so zap it.
864 */
865 vma->vm_private_data = NULL;
866 zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
867}
868
869static void rdma_umap_close(struct vm_area_struct *vma)
870{
871 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
872 struct rdma_umap_priv *priv = vma->vm_private_data;
873
874 if (!priv)
875 return;
876
877 /*
878 * The vma holds a reference on the struct file that created it, which
879 * in turn means that the ib_uverbs_file is guaranteed to exist at
880 * this point.
881 */
882 mutex_lock(&ufile->umap_lock);
883 list_del(&priv->list);
884 mutex_unlock(&ufile->umap_lock);
885 kfree(priv);
886}
887
888/*
889 * Once the zap_vma_ptes has been called touches to the VMA will come here and
890 * we return a dummy writable zero page for all the pfns.
891 */
892static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
893{
894 struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
895 struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
896 vm_fault_t ret = 0;
897
898 if (!priv)
899 return VM_FAULT_SIGBUS;
900
901 /* Read only pages can just use the system zero page. */
902 if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
903 vmf->page = ZERO_PAGE(vmf->address);
904 get_page(vmf->page);
905 return 0;
906 }
907
908 mutex_lock(&ufile->umap_lock);
909 if (!ufile->disassociate_page)
910 ufile->disassociate_page =
911 alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
912
913 if (ufile->disassociate_page) {
914 /*
915 * This VMA is forced to always be shared so this doesn't have
916 * to worry about COW.
917 */
918 vmf->page = ufile->disassociate_page;
919 get_page(vmf->page);
920 } else {
921 ret = VM_FAULT_SIGBUS;
922 }
923 mutex_unlock(&ufile->umap_lock);
924
925 return ret;
926}
927
928static const struct vm_operations_struct rdma_umap_ops = {
929 .open = rdma_umap_open,
930 .close = rdma_umap_close,
931 .fault = rdma_umap_fault,
932};
933
934/*
935 * Map IO memory into a process. This is to be called by drivers as part of
936 * their mmap() functions if they wish to send something like PCI-E BAR memory
937 * to userspace.
938 */
939int rdma_user_mmap_io(struct ib_ucontext *ucontext, struct vm_area_struct *vma,
940 unsigned long pfn, unsigned long size, pgprot_t prot)
941{
942 struct ib_uverbs_file *ufile = ucontext->ufile;
943 struct rdma_umap_priv *priv;
944
945 if (!(vma->vm_flags & VM_SHARED))
946 return -EINVAL;
947
948 if (vma->vm_end - vma->vm_start != size)
949 return -EINVAL;
950
951 /* Driver is using this wrong, must be called by ib_uverbs_mmap */
952 if (WARN_ON(!vma->vm_file ||
953 vma->vm_file->private_data != ufile))
954 return -EINVAL;
955 lockdep_assert_held(&ufile->device->disassociate_srcu);
956
957 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
958 if (!priv)
959 return -ENOMEM;
960
961 vma->vm_page_prot = prot;
962 if (io_remap_pfn_range(vma, vma->vm_start, pfn, size, prot)) {
963 kfree(priv);
964 return -EAGAIN;
965 }
966
967 rdma_umap_priv_init(priv, vma);
968 return 0;
969}
970EXPORT_SYMBOL(rdma_user_mmap_io);
971
972void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
973{
974 struct rdma_umap_priv *priv, *next_priv;
975
976 lockdep_assert_held(&ufile->hw_destroy_rwsem);
977
978 while (1) {
979 struct mm_struct *mm = NULL;
980
981 /* Get an arbitrary mm pointer that hasn't been cleaned yet */
982 mutex_lock(&ufile->umap_lock);
983 while (!list_empty(&ufile->umaps)) {
984 int ret;
985
986 priv = list_first_entry(&ufile->umaps,
987 struct rdma_umap_priv, list);
988 mm = priv->vma->vm_mm;
989 ret = mmget_not_zero(mm);
990 if (!ret) {
991 list_del_init(&priv->list);
992 mm = NULL;
993 continue;
994 }
995 break;
996 }
997 mutex_unlock(&ufile->umap_lock);
998 if (!mm)
999 return;
1000
1001 /*
1002 * The umap_lock is nested under mmap_sem since it used within
1003 * the vma_ops callbacks, so we have to clean the list one mm
1004 * at a time to get the lock ordering right. Typically there
1005 * will only be one mm, so no big deal.
1006 */
1007 down_read(&mm->mmap_sem);
1008 if (!mmget_still_valid(mm))
1009 goto skip_mm;
1010 mutex_lock(&ufile->umap_lock);
1011 list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
1012 list) {
1013 struct vm_area_struct *vma = priv->vma;
1014
1015 if (vma->vm_mm != mm)
1016 continue;
1017 list_del_init(&priv->list);
1018
1019 zap_vma_ptes(vma, vma->vm_start,
1020 vma->vm_end - vma->vm_start);
1021 }
1022 mutex_unlock(&ufile->umap_lock);
1023 skip_mm:
1024 up_read(&mm->mmap_sem);
1025 mmput(mm);
1026 }
1027}
1028
1029/*
1030 * ib_uverbs_open() does not need the BKL:
1031 *
1032 * - the ib_uverbs_device structures are properly reference counted and
1033 * everything else is purely local to the file being created, so
1034 * races against other open calls are not a problem;
1035 * - there is no ioctl method to race against;
1036 * - the open method will either immediately run -ENXIO, or all
1037 * required initialization will be done.
1038 */
1039static int ib_uverbs_open(struct inode *inode, struct file *filp)
1040{
1041 struct ib_uverbs_device *dev;
1042 struct ib_uverbs_file *file;
1043 struct ib_device *ib_dev;
1044 int ret;
1045 int module_dependent;
1046 int srcu_key;
1047
1048 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
1049 if (!atomic_inc_not_zero(&dev->refcount))
1050 return -ENXIO;
1051
1052 get_device(&dev->dev);
1053 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1054 mutex_lock(&dev->lists_mutex);
1055 ib_dev = srcu_dereference(dev->ib_dev,
1056 &dev->disassociate_srcu);
1057 if (!ib_dev) {
1058 ret = -EIO;
1059 goto err;
1060 }
1061
1062 if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
1063 ret = -EPERM;
1064 goto err;
1065 }
1066
1067 /* In case IB device supports disassociate ucontext, there is no hard
1068 * dependency between uverbs device and its low level device.
1069 */
1070 module_dependent = !(ib_dev->ops.disassociate_ucontext);
1071
1072 if (module_dependent) {
1073 if (!try_module_get(ib_dev->ops.owner)) {
1074 ret = -ENODEV;
1075 goto err;
1076 }
1077 }
1078
1079 file = kzalloc(sizeof(*file), GFP_KERNEL);
1080 if (!file) {
1081 ret = -ENOMEM;
1082 if (module_dependent)
1083 goto err_module;
1084
1085 goto err;
1086 }
1087
1088 file->device = dev;
1089 kref_init(&file->ref);
1090 mutex_init(&file->ucontext_lock);
1091
1092 spin_lock_init(&file->uobjects_lock);
1093 INIT_LIST_HEAD(&file->uobjects);
1094 init_rwsem(&file->hw_destroy_rwsem);
1095 mutex_init(&file->umap_lock);
1096 INIT_LIST_HEAD(&file->umaps);
1097
1098 filp->private_data = file;
1099 list_add_tail(&file->list, &dev->uverbs_file_list);
1100 mutex_unlock(&dev->lists_mutex);
1101 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1102
1103 setup_ufile_idr_uobject(file);
1104
1105 return stream_open(inode, filp);
1106
1107err_module:
1108 module_put(ib_dev->ops.owner);
1109
1110err:
1111 mutex_unlock(&dev->lists_mutex);
1112 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1113 if (atomic_dec_and_test(&dev->refcount))
1114 ib_uverbs_comp_dev(dev);
1115
1116 put_device(&dev->dev);
1117 return ret;
1118}
1119
1120static int ib_uverbs_close(struct inode *inode, struct file *filp)
1121{
1122 struct ib_uverbs_file *file = filp->private_data;
1123
1124 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
1125
1126 mutex_lock(&file->device->lists_mutex);
1127 list_del_init(&file->list);
1128 mutex_unlock(&file->device->lists_mutex);
1129
1130 kref_put(&file->ref, ib_uverbs_release_file);
1131
1132 return 0;
1133}
1134
1135static const struct file_operations uverbs_fops = {
1136 .owner = THIS_MODULE,
1137 .write = ib_uverbs_write,
1138 .open = ib_uverbs_open,
1139 .release = ib_uverbs_close,
1140 .llseek = no_llseek,
1141 .unlocked_ioctl = ib_uverbs_ioctl,
1142 .compat_ioctl = ib_uverbs_ioctl,
1143};
1144
1145static const struct file_operations uverbs_mmap_fops = {
1146 .owner = THIS_MODULE,
1147 .write = ib_uverbs_write,
1148 .mmap = ib_uverbs_mmap,
1149 .open = ib_uverbs_open,
1150 .release = ib_uverbs_close,
1151 .llseek = no_llseek,
1152 .unlocked_ioctl = ib_uverbs_ioctl,
1153 .compat_ioctl = ib_uverbs_ioctl,
1154};
1155
1156static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1157 struct ib_client_nl_info *res)
1158{
1159 struct ib_uverbs_device *uverbs_dev = client_data;
1160 int ret;
1161
1162 if (res->port != -1)
1163 return -EINVAL;
1164
1165 res->abi = ibdev->ops.uverbs_abi_ver;
1166 res->cdev = &uverbs_dev->dev;
1167
1168 /*
1169 * To support DRIVER_ID binding in userspace some of the driver need
1170 * upgrading to expose their PCI dependent revision information
1171 * through get_context instead of relying on modalias matching. When
1172 * the drivers are fixed they can drop this flag.
1173 */
1174 if (!ibdev->ops.uverbs_no_driver_id_binding) {
1175 ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1176 ibdev->ops.driver_id);
1177 if (ret)
1178 return ret;
1179 }
1180 return 0;
1181}
1182
1183static struct ib_client uverbs_client = {
1184 .name = "uverbs",
1185 .no_kverbs_req = true,
1186 .add = ib_uverbs_add_one,
1187 .remove = ib_uverbs_remove_one,
1188 .get_nl_info = ib_uverbs_get_nl_info,
1189};
1190MODULE_ALIAS_RDMA_CLIENT("uverbs");
1191
1192static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1193 char *buf)
1194{
1195 struct ib_uverbs_device *dev =
1196 container_of(device, struct ib_uverbs_device, dev);
1197 int ret = -ENODEV;
1198 int srcu_key;
1199 struct ib_device *ib_dev;
1200
1201 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1202 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1203 if (ib_dev)
1204 ret = sprintf(buf, "%s\n", dev_name(&ib_dev->dev));
1205 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1206
1207 return ret;
1208}
1209static DEVICE_ATTR_RO(ibdev);
1210
1211static ssize_t abi_version_show(struct device *device,
1212 struct device_attribute *attr, char *buf)
1213{
1214 struct ib_uverbs_device *dev =
1215 container_of(device, struct ib_uverbs_device, dev);
1216 int ret = -ENODEV;
1217 int srcu_key;
1218 struct ib_device *ib_dev;
1219
1220 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1221 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1222 if (ib_dev)
1223 ret = sprintf(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1224 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1225
1226 return ret;
1227}
1228static DEVICE_ATTR_RO(abi_version);
1229
1230static struct attribute *ib_dev_attrs[] = {
1231 &dev_attr_abi_version.attr,
1232 &dev_attr_ibdev.attr,
1233 NULL,
1234};
1235
1236static const struct attribute_group dev_attr_group = {
1237 .attrs = ib_dev_attrs,
1238};
1239
1240static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1241 __stringify(IB_USER_VERBS_ABI_VERSION));
1242
1243static int ib_uverbs_create_uapi(struct ib_device *device,
1244 struct ib_uverbs_device *uverbs_dev)
1245{
1246 struct uverbs_api *uapi;
1247
1248 uapi = uverbs_alloc_api(device);
1249 if (IS_ERR(uapi))
1250 return PTR_ERR(uapi);
1251
1252 uverbs_dev->uapi = uapi;
1253 return 0;
1254}
1255
1256static void ib_uverbs_add_one(struct ib_device *device)
1257{
1258 int devnum;
1259 dev_t base;
1260 struct ib_uverbs_device *uverbs_dev;
1261 int ret;
1262
1263 if (!device->ops.alloc_ucontext)
1264 return;
1265
1266 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1267 if (!uverbs_dev)
1268 return;
1269
1270 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1271 if (ret) {
1272 kfree(uverbs_dev);
1273 return;
1274 }
1275
1276 device_initialize(&uverbs_dev->dev);
1277 uverbs_dev->dev.class = uverbs_class;
1278 uverbs_dev->dev.parent = device->dev.parent;
1279 uverbs_dev->dev.release = ib_uverbs_release_dev;
1280 uverbs_dev->groups[0] = &dev_attr_group;
1281 uverbs_dev->dev.groups = uverbs_dev->groups;
1282 atomic_set(&uverbs_dev->refcount, 1);
1283 init_completion(&uverbs_dev->comp);
1284 uverbs_dev->xrcd_tree = RB_ROOT;
1285 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1286 mutex_init(&uverbs_dev->lists_mutex);
1287 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1288 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1289 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1290 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1291
1292 devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1293 GFP_KERNEL);
1294 if (devnum < 0)
1295 goto err;
1296 uverbs_dev->devnum = devnum;
1297 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1298 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1299 else
1300 base = IB_UVERBS_BASE_DEV + devnum;
1301
1302 if (ib_uverbs_create_uapi(device, uverbs_dev))
1303 goto err_uapi;
1304
1305 uverbs_dev->dev.devt = base;
1306 dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1307
1308 cdev_init(&uverbs_dev->cdev,
1309 device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1310 uverbs_dev->cdev.owner = THIS_MODULE;
1311
1312 ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1313 if (ret)
1314 goto err_uapi;
1315
1316 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1317 return;
1318
1319err_uapi:
1320 ida_free(&uverbs_ida, devnum);
1321err:
1322 if (atomic_dec_and_test(&uverbs_dev->refcount))
1323 ib_uverbs_comp_dev(uverbs_dev);
1324 wait_for_completion(&uverbs_dev->comp);
1325 put_device(&uverbs_dev->dev);
1326 return;
1327}
1328
1329static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1330 struct ib_device *ib_dev)
1331{
1332 struct ib_uverbs_file *file;
1333 struct ib_uverbs_async_event_file *event_file;
1334 struct ib_event event;
1335
1336 /* Pending running commands to terminate */
1337 uverbs_disassociate_api_pre(uverbs_dev);
1338 event.event = IB_EVENT_DEVICE_FATAL;
1339 event.element.port_num = 0;
1340 event.device = ib_dev;
1341
1342 mutex_lock(&uverbs_dev->lists_mutex);
1343 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1344 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1345 struct ib_uverbs_file, list);
1346 list_del_init(&file->list);
1347 kref_get(&file->ref);
1348
1349 /* We must release the mutex before going ahead and calling
1350 * uverbs_cleanup_ufile, as it might end up indirectly calling
1351 * uverbs_close, for example due to freeing the resources (e.g
1352 * mmput).
1353 */
1354 mutex_unlock(&uverbs_dev->lists_mutex);
1355
1356 ib_uverbs_event_handler(&file->event_handler, &event);
1357 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1358 kref_put(&file->ref, ib_uverbs_release_file);
1359
1360 mutex_lock(&uverbs_dev->lists_mutex);
1361 }
1362
1363 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1364 event_file = list_first_entry(&uverbs_dev->
1365 uverbs_events_file_list,
1366 struct ib_uverbs_async_event_file,
1367 list);
1368 spin_lock_irq(&event_file->ev_queue.lock);
1369 event_file->ev_queue.is_closed = 1;
1370 spin_unlock_irq(&event_file->ev_queue.lock);
1371
1372 list_del(&event_file->list);
1373 ib_unregister_event_handler(
1374 &event_file->uverbs_file->event_handler);
1375 event_file->uverbs_file->event_handler.device =
1376 NULL;
1377
1378 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1379 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1380 }
1381 mutex_unlock(&uverbs_dev->lists_mutex);
1382
1383 uverbs_disassociate_api(uverbs_dev->uapi);
1384}
1385
1386static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1387{
1388 struct ib_uverbs_device *uverbs_dev = client_data;
1389 int wait_clients = 1;
1390
1391 if (!uverbs_dev)
1392 return;
1393
1394 cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1395 ida_free(&uverbs_ida, uverbs_dev->devnum);
1396
1397 if (device->ops.disassociate_ucontext) {
1398 /* We disassociate HW resources and immediately return.
1399 * Userspace will see a EIO errno for all future access.
1400 * Upon returning, ib_device may be freed internally and is not
1401 * valid any more.
1402 * uverbs_device is still available until all clients close
1403 * their files, then the uverbs device ref count will be zero
1404 * and its resources will be freed.
1405 * Note: At this point no more files can be opened since the
1406 * cdev was deleted, however active clients can still issue
1407 * commands and close their open files.
1408 */
1409 ib_uverbs_free_hw_resources(uverbs_dev, device);
1410 wait_clients = 0;
1411 }
1412
1413 if (atomic_dec_and_test(&uverbs_dev->refcount))
1414 ib_uverbs_comp_dev(uverbs_dev);
1415 if (wait_clients)
1416 wait_for_completion(&uverbs_dev->comp);
1417
1418 put_device(&uverbs_dev->dev);
1419}
1420
1421static char *uverbs_devnode(struct device *dev, umode_t *mode)
1422{
1423 if (mode)
1424 *mode = 0666;
1425 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1426}
1427
1428static int __init ib_uverbs_init(void)
1429{
1430 int ret;
1431
1432 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1433 IB_UVERBS_NUM_FIXED_MINOR,
1434 "infiniband_verbs");
1435 if (ret) {
1436 pr_err("user_verbs: couldn't register device number\n");
1437 goto out;
1438 }
1439
1440 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1441 IB_UVERBS_NUM_DYNAMIC_MINOR,
1442 "infiniband_verbs");
1443 if (ret) {
1444 pr_err("couldn't register dynamic device number\n");
1445 goto out_alloc;
1446 }
1447
1448 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1449 if (IS_ERR(uverbs_class)) {
1450 ret = PTR_ERR(uverbs_class);
1451 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1452 goto out_chrdev;
1453 }
1454
1455 uverbs_class->devnode = uverbs_devnode;
1456
1457 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1458 if (ret) {
1459 pr_err("user_verbs: couldn't create abi_version attribute\n");
1460 goto out_class;
1461 }
1462
1463 ret = ib_register_client(&uverbs_client);
1464 if (ret) {
1465 pr_err("user_verbs: couldn't register client\n");
1466 goto out_class;
1467 }
1468
1469 return 0;
1470
1471out_class:
1472 class_destroy(uverbs_class);
1473
1474out_chrdev:
1475 unregister_chrdev_region(dynamic_uverbs_dev,
1476 IB_UVERBS_NUM_DYNAMIC_MINOR);
1477
1478out_alloc:
1479 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1480 IB_UVERBS_NUM_FIXED_MINOR);
1481
1482out:
1483 return ret;
1484}
1485
1486static void __exit ib_uverbs_cleanup(void)
1487{
1488 ib_unregister_client(&uverbs_client);
1489 class_destroy(uverbs_class);
1490 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1491 IB_UVERBS_NUM_FIXED_MINOR);
1492 unregister_chrdev_region(dynamic_uverbs_dev,
1493 IB_UVERBS_NUM_DYNAMIC_MINOR);
1494 mmu_notifier_synchronize();
1495}
1496
1497module_init(ib_uverbs_init);
1498module_exit(ib_uverbs_cleanup);