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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#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;
75
76static DEFINE_IDA(uverbs_ida);
77static int ib_uverbs_add_one(struct ib_device *device);
78static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
79static struct ib_client uverbs_client;
80
81static char *uverbs_devnode(const struct device *dev, umode_t *mode)
82{
83 if (mode)
84 *mode = 0666;
85 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
86}
87
88static const struct class uverbs_class = {
89 .name = "infiniband_verbs",
90 .devnode = uverbs_devnode,
91};
92
93/*
94 * Must be called with the ufile->device->disassociate_srcu held, and the lock
95 * must be held until use of the ucontext is finished.
96 */
97struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
98{
99 /*
100 * We do not hold the hw_destroy_rwsem lock for this flow, instead
101 * srcu is used. It does not matter if someone races this with
102 * get_context, we get NULL or valid ucontext.
103 */
104 struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
105
106 if (!srcu_dereference(ufile->device->ib_dev,
107 &ufile->device->disassociate_srcu))
108 return ERR_PTR(-EIO);
109
110 if (!ucontext)
111 return ERR_PTR(-EINVAL);
112
113 return ucontext;
114}
115EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
116
117int uverbs_dealloc_mw(struct ib_mw *mw)
118{
119 struct ib_pd *pd = mw->pd;
120 int ret;
121
122 ret = mw->device->ops.dealloc_mw(mw);
123 if (ret)
124 return ret;
125
126 atomic_dec(&pd->usecnt);
127 kfree(mw);
128 return ret;
129}
130
131static void ib_uverbs_release_dev(struct device *device)
132{
133 struct ib_uverbs_device *dev =
134 container_of(device, struct ib_uverbs_device, dev);
135
136 uverbs_destroy_api(dev->uapi);
137 cleanup_srcu_struct(&dev->disassociate_srcu);
138 mutex_destroy(&dev->lists_mutex);
139 mutex_destroy(&dev->xrcd_tree_mutex);
140 kfree(dev);
141}
142
143void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
144 struct ib_ucq_object *uobj)
145{
146 struct ib_uverbs_event *evt, *tmp;
147
148 if (ev_file) {
149 spin_lock_irq(&ev_file->ev_queue.lock);
150 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
151 list_del(&evt->list);
152 kfree(evt);
153 }
154 spin_unlock_irq(&ev_file->ev_queue.lock);
155
156 uverbs_uobject_put(&ev_file->uobj);
157 }
158
159 ib_uverbs_release_uevent(&uobj->uevent);
160}
161
162void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
163{
164 struct ib_uverbs_async_event_file *async_file = uobj->event_file;
165 struct ib_uverbs_event *evt, *tmp;
166
167 if (!async_file)
168 return;
169
170 spin_lock_irq(&async_file->ev_queue.lock);
171 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
172 list_del(&evt->list);
173 kfree(evt);
174 }
175 spin_unlock_irq(&async_file->ev_queue.lock);
176 uverbs_uobject_put(&async_file->uobj);
177}
178
179void ib_uverbs_detach_umcast(struct ib_qp *qp,
180 struct ib_uqp_object *uobj)
181{
182 struct ib_uverbs_mcast_entry *mcast, *tmp;
183
184 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
185 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
186 list_del(&mcast->list);
187 kfree(mcast);
188 }
189}
190
191static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
192{
193 complete(&dev->comp);
194}
195
196void ib_uverbs_release_file(struct kref *ref)
197{
198 struct ib_uverbs_file *file =
199 container_of(ref, struct ib_uverbs_file, ref);
200 struct ib_device *ib_dev;
201 int srcu_key;
202
203 release_ufile_idr_uobject(file);
204
205 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
206 ib_dev = srcu_dereference(file->device->ib_dev,
207 &file->device->disassociate_srcu);
208 if (ib_dev && !ib_dev->ops.disassociate_ucontext)
209 module_put(ib_dev->ops.owner);
210 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
211
212 if (refcount_dec_and_test(&file->device->refcount))
213 ib_uverbs_comp_dev(file->device);
214
215 if (file->default_async_file)
216 uverbs_uobject_put(&file->default_async_file->uobj);
217 put_device(&file->device->dev);
218
219 if (file->disassociate_page)
220 __free_pages(file->disassociate_page, 0);
221 mutex_destroy(&file->disassociation_lock);
222 mutex_destroy(&file->umap_lock);
223 mutex_destroy(&file->ucontext_lock);
224 kfree(file);
225}
226
227static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
228 struct file *filp, char __user *buf,
229 size_t count, loff_t *pos,
230 size_t eventsz)
231{
232 struct ib_uverbs_event *event;
233 int ret = 0;
234
235 spin_lock_irq(&ev_queue->lock);
236
237 while (list_empty(&ev_queue->event_list)) {
238 if (ev_queue->is_closed) {
239 spin_unlock_irq(&ev_queue->lock);
240 return -EIO;
241 }
242
243 spin_unlock_irq(&ev_queue->lock);
244 if (filp->f_flags & O_NONBLOCK)
245 return -EAGAIN;
246
247 if (wait_event_interruptible(ev_queue->poll_wait,
248 (!list_empty(&ev_queue->event_list) ||
249 ev_queue->is_closed)))
250 return -ERESTARTSYS;
251
252 spin_lock_irq(&ev_queue->lock);
253 }
254
255 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
256
257 if (eventsz > count) {
258 ret = -EINVAL;
259 event = NULL;
260 } else {
261 list_del(ev_queue->event_list.next);
262 if (event->counter) {
263 ++(*event->counter);
264 list_del(&event->obj_list);
265 }
266 }
267
268 spin_unlock_irq(&ev_queue->lock);
269
270 if (event) {
271 if (copy_to_user(buf, event, eventsz))
272 ret = -EFAULT;
273 else
274 ret = eventsz;
275 }
276
277 kfree(event);
278
279 return ret;
280}
281
282static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
283 size_t count, loff_t *pos)
284{
285 struct ib_uverbs_async_event_file *file = filp->private_data;
286
287 return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
288 sizeof(struct ib_uverbs_async_event_desc));
289}
290
291static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
292 size_t count, loff_t *pos)
293{
294 struct ib_uverbs_completion_event_file *comp_ev_file =
295 filp->private_data;
296
297 return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
298 pos,
299 sizeof(struct ib_uverbs_comp_event_desc));
300}
301
302static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
303 struct file *filp,
304 struct poll_table_struct *wait)
305{
306 __poll_t pollflags = 0;
307
308 poll_wait(filp, &ev_queue->poll_wait, wait);
309
310 spin_lock_irq(&ev_queue->lock);
311 if (!list_empty(&ev_queue->event_list))
312 pollflags = EPOLLIN | EPOLLRDNORM;
313 else if (ev_queue->is_closed)
314 pollflags = EPOLLERR;
315 spin_unlock_irq(&ev_queue->lock);
316
317 return pollflags;
318}
319
320static __poll_t ib_uverbs_async_event_poll(struct file *filp,
321 struct poll_table_struct *wait)
322{
323 struct ib_uverbs_async_event_file *file = filp->private_data;
324
325 return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
326}
327
328static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
329 struct poll_table_struct *wait)
330{
331 struct ib_uverbs_completion_event_file *comp_ev_file =
332 filp->private_data;
333
334 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
335}
336
337static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
338{
339 struct ib_uverbs_async_event_file *file = filp->private_data;
340
341 return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
342}
343
344static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
345{
346 struct ib_uverbs_completion_event_file *comp_ev_file =
347 filp->private_data;
348
349 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
350}
351
352const struct file_operations uverbs_event_fops = {
353 .owner = THIS_MODULE,
354 .read = ib_uverbs_comp_event_read,
355 .poll = ib_uverbs_comp_event_poll,
356 .release = uverbs_uobject_fd_release,
357 .fasync = ib_uverbs_comp_event_fasync,
358};
359
360const struct file_operations uverbs_async_event_fops = {
361 .owner = THIS_MODULE,
362 .read = ib_uverbs_async_event_read,
363 .poll = ib_uverbs_async_event_poll,
364 .release = uverbs_async_event_release,
365 .fasync = ib_uverbs_async_event_fasync,
366};
367
368void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
369{
370 struct ib_uverbs_event_queue *ev_queue = cq_context;
371 struct ib_ucq_object *uobj;
372 struct ib_uverbs_event *entry;
373 unsigned long flags;
374
375 if (!ev_queue)
376 return;
377
378 spin_lock_irqsave(&ev_queue->lock, flags);
379 if (ev_queue->is_closed) {
380 spin_unlock_irqrestore(&ev_queue->lock, flags);
381 return;
382 }
383
384 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
385 if (!entry) {
386 spin_unlock_irqrestore(&ev_queue->lock, flags);
387 return;
388 }
389
390 uobj = cq->uobject;
391
392 entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle;
393 entry->counter = &uobj->comp_events_reported;
394
395 list_add_tail(&entry->list, &ev_queue->event_list);
396 list_add_tail(&entry->obj_list, &uobj->comp_list);
397 spin_unlock_irqrestore(&ev_queue->lock, flags);
398
399 wake_up_interruptible(&ev_queue->poll_wait);
400 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
401}
402
403void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
404 __u64 element, __u64 event,
405 struct list_head *obj_list, u32 *counter)
406{
407 struct ib_uverbs_event *entry;
408 unsigned long flags;
409
410 if (!async_file)
411 return;
412
413 spin_lock_irqsave(&async_file->ev_queue.lock, flags);
414 if (async_file->ev_queue.is_closed) {
415 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
416 return;
417 }
418
419 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
420 if (!entry) {
421 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
422 return;
423 }
424
425 entry->desc.async.element = element;
426 entry->desc.async.event_type = event;
427 entry->desc.async.reserved = 0;
428 entry->counter = counter;
429
430 list_add_tail(&entry->list, &async_file->ev_queue.event_list);
431 if (obj_list)
432 list_add_tail(&entry->obj_list, obj_list);
433 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
434
435 wake_up_interruptible(&async_file->ev_queue.poll_wait);
436 kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN);
437}
438
439static void uverbs_uobj_event(struct ib_uevent_object *eobj,
440 struct ib_event *event)
441{
442 ib_uverbs_async_handler(eobj->event_file,
443 eobj->uobject.user_handle, event->event,
444 &eobj->event_list, &eobj->events_reported);
445}
446
447void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
448{
449 uverbs_uobj_event(&event->element.cq->uobject->uevent, event);
450}
451
452void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
453{
454 /* for XRC target qp's, check that qp is live */
455 if (!event->element.qp->uobject)
456 return;
457
458 uverbs_uobj_event(&event->element.qp->uobject->uevent, event);
459}
460
461void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
462{
463 uverbs_uobj_event(&event->element.wq->uobject->uevent, event);
464}
465
466void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
467{
468 uverbs_uobj_event(&event->element.srq->uobject->uevent, event);
469}
470
471static void ib_uverbs_event_handler(struct ib_event_handler *handler,
472 struct ib_event *event)
473{
474 ib_uverbs_async_handler(
475 container_of(handler, struct ib_uverbs_async_event_file,
476 event_handler),
477 event->element.port_num, event->event, NULL, NULL);
478}
479
480void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
481{
482 spin_lock_init(&ev_queue->lock);
483 INIT_LIST_HEAD(&ev_queue->event_list);
484 init_waitqueue_head(&ev_queue->poll_wait);
485 ev_queue->is_closed = 0;
486 ev_queue->async_queue = NULL;
487}
488
489void ib_uverbs_init_async_event_file(
490 struct ib_uverbs_async_event_file *async_file)
491{
492 struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile;
493 struct ib_device *ib_dev = async_file->uobj.context->device;
494
495 ib_uverbs_init_event_queue(&async_file->ev_queue);
496
497 /* The first async_event_file becomes the default one for the file. */
498 mutex_lock(&uverbs_file->ucontext_lock);
499 if (!uverbs_file->default_async_file) {
500 /* Pairs with the put in ib_uverbs_release_file */
501 uverbs_uobject_get(&async_file->uobj);
502 smp_store_release(&uverbs_file->default_async_file, async_file);
503 }
504 mutex_unlock(&uverbs_file->ucontext_lock);
505
506 INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev,
507 ib_uverbs_event_handler);
508 ib_register_event_handler(&async_file->event_handler);
509}
510
511static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
512 struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
513 const struct uverbs_api_write_method *method_elm)
514{
515 if (method_elm->is_ex) {
516 count -= sizeof(*hdr) + sizeof(*ex_hdr);
517
518 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
519 return -EINVAL;
520
521 if (hdr->in_words * 8 < method_elm->req_size)
522 return -ENOSPC;
523
524 if (ex_hdr->cmd_hdr_reserved)
525 return -EINVAL;
526
527 if (ex_hdr->response) {
528 if (!hdr->out_words && !ex_hdr->provider_out_words)
529 return -EINVAL;
530
531 if (hdr->out_words * 8 < method_elm->resp_size)
532 return -ENOSPC;
533
534 if (!access_ok(u64_to_user_ptr(ex_hdr->response),
535 (hdr->out_words + ex_hdr->provider_out_words) * 8))
536 return -EFAULT;
537 } else {
538 if (hdr->out_words || ex_hdr->provider_out_words)
539 return -EINVAL;
540 }
541
542 return 0;
543 }
544
545 /* not extended command */
546 if (hdr->in_words * 4 != count)
547 return -EINVAL;
548
549 if (count < method_elm->req_size + sizeof(*hdr)) {
550 /*
551 * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
552 * with a 16 byte write instead of 24. Old kernels didn't
553 * check the size so they allowed this. Now that the size is
554 * checked provide a compatibility work around to not break
555 * those userspaces.
556 */
557 if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
558 count == 16) {
559 hdr->in_words = 6;
560 return 0;
561 }
562 return -ENOSPC;
563 }
564 if (hdr->out_words * 4 < method_elm->resp_size)
565 return -ENOSPC;
566
567 return 0;
568}
569
570static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
571 size_t count, loff_t *pos)
572{
573 struct ib_uverbs_file *file = filp->private_data;
574 const struct uverbs_api_write_method *method_elm;
575 struct uverbs_api *uapi = file->device->uapi;
576 struct ib_uverbs_ex_cmd_hdr ex_hdr;
577 struct ib_uverbs_cmd_hdr hdr;
578 struct uverbs_attr_bundle bundle;
579 int srcu_key;
580 ssize_t ret;
581
582 if (!ib_safe_file_access(filp)) {
583 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
584 task_tgid_vnr(current), current->comm);
585 return -EACCES;
586 }
587
588 if (count < sizeof(hdr))
589 return -EINVAL;
590
591 if (copy_from_user(&hdr, buf, sizeof(hdr)))
592 return -EFAULT;
593
594 method_elm = uapi_get_method(uapi, hdr.command);
595 if (IS_ERR(method_elm))
596 return PTR_ERR(method_elm);
597
598 if (method_elm->is_ex) {
599 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
600 return -EINVAL;
601 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
602 return -EFAULT;
603 }
604
605 ret = verify_hdr(&hdr, &ex_hdr, count, method_elm);
606 if (ret)
607 return ret;
608
609 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
610
611 buf += sizeof(hdr);
612
613 memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
614 bundle.ufile = file;
615 bundle.context = NULL; /* only valid if bundle has uobject */
616 bundle.uobject = NULL;
617 if (!method_elm->is_ex) {
618 size_t in_len = hdr.in_words * 4 - sizeof(hdr);
619 size_t out_len = hdr.out_words * 4;
620 u64 response = 0;
621
622 if (method_elm->has_udata) {
623 bundle.driver_udata.inlen =
624 in_len - method_elm->req_size;
625 in_len = method_elm->req_size;
626 if (bundle.driver_udata.inlen)
627 bundle.driver_udata.inbuf = buf + in_len;
628 else
629 bundle.driver_udata.inbuf = NULL;
630 } else {
631 memset(&bundle.driver_udata, 0,
632 sizeof(bundle.driver_udata));
633 }
634
635 if (method_elm->has_resp) {
636 /*
637 * The macros check that if has_resp is set
638 * then the command request structure starts
639 * with a '__aligned u64 response' member.
640 */
641 ret = get_user(response, (const u64 __user *)buf);
642 if (ret)
643 goto out_unlock;
644
645 if (method_elm->has_udata) {
646 bundle.driver_udata.outlen =
647 out_len - method_elm->resp_size;
648 out_len = method_elm->resp_size;
649 if (bundle.driver_udata.outlen)
650 bundle.driver_udata.outbuf =
651 u64_to_user_ptr(response +
652 out_len);
653 else
654 bundle.driver_udata.outbuf = NULL;
655 }
656 } else {
657 bundle.driver_udata.outlen = 0;
658 bundle.driver_udata.outbuf = NULL;
659 }
660
661 ib_uverbs_init_udata_buf_or_null(
662 &bundle.ucore, buf, u64_to_user_ptr(response),
663 in_len, out_len);
664 } else {
665 buf += sizeof(ex_hdr);
666
667 ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
668 u64_to_user_ptr(ex_hdr.response),
669 hdr.in_words * 8, hdr.out_words * 8);
670
671 ib_uverbs_init_udata_buf_or_null(
672 &bundle.driver_udata, buf + bundle.ucore.inlen,
673 u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
674 ex_hdr.provider_in_words * 8,
675 ex_hdr.provider_out_words * 8);
676
677 }
678
679 ret = method_elm->handler(&bundle);
680 if (bundle.uobject)
681 uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true,
682 !ret, &bundle);
683out_unlock:
684 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
685 return (ret) ? : count;
686}
687
688static const struct vm_operations_struct rdma_umap_ops;
689
690static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
691{
692 struct ib_uverbs_file *file = filp->private_data;
693 struct ib_ucontext *ucontext;
694 int ret = 0;
695 int srcu_key;
696
697 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
698 ucontext = ib_uverbs_get_ucontext_file(file);
699 if (IS_ERR(ucontext)) {
700 ret = PTR_ERR(ucontext);
701 goto out;
702 }
703
704 mutex_lock(&file->disassociation_lock);
705
706 vma->vm_ops = &rdma_umap_ops;
707 ret = ucontext->device->ops.mmap(ucontext, vma);
708
709 mutex_unlock(&file->disassociation_lock);
710out:
711 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
712 return ret;
713}
714
715/*
716 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
717 * struct
718 */
719static void rdma_umap_open(struct vm_area_struct *vma)
720{
721 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
722 struct rdma_umap_priv *opriv = vma->vm_private_data;
723 struct rdma_umap_priv *priv;
724
725 if (!opriv)
726 return;
727
728 /* We are racing with disassociation */
729 if (!down_read_trylock(&ufile->hw_destroy_rwsem))
730 goto out_zap;
731 mutex_lock(&ufile->disassociation_lock);
732
733 /*
734 * Disassociation already completed, the VMA should already be zapped.
735 */
736 if (!ufile->ucontext)
737 goto out_unlock;
738
739 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
740 if (!priv)
741 goto out_unlock;
742 rdma_umap_priv_init(priv, vma, opriv->entry);
743
744 mutex_unlock(&ufile->disassociation_lock);
745 up_read(&ufile->hw_destroy_rwsem);
746 return;
747
748out_unlock:
749 mutex_unlock(&ufile->disassociation_lock);
750 up_read(&ufile->hw_destroy_rwsem);
751out_zap:
752 /*
753 * We can't allow the VMA to be created with the actual IO pages, that
754 * would break our API contract, and it can't be stopped at this
755 * point, so zap it.
756 */
757 vma->vm_private_data = NULL;
758 zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
759}
760
761static void rdma_umap_close(struct vm_area_struct *vma)
762{
763 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
764 struct rdma_umap_priv *priv = vma->vm_private_data;
765
766 if (!priv)
767 return;
768
769 /*
770 * The vma holds a reference on the struct file that created it, which
771 * in turn means that the ib_uverbs_file is guaranteed to exist at
772 * this point.
773 */
774 mutex_lock(&ufile->umap_lock);
775 if (priv->entry)
776 rdma_user_mmap_entry_put(priv->entry);
777
778 list_del(&priv->list);
779 mutex_unlock(&ufile->umap_lock);
780 kfree(priv);
781}
782
783/*
784 * Once the zap_vma_ptes has been called touches to the VMA will come here and
785 * we return a dummy writable zero page for all the pfns.
786 */
787static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
788{
789 struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
790 struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
791 vm_fault_t ret = 0;
792
793 if (!priv)
794 return VM_FAULT_SIGBUS;
795
796 /* Read only pages can just use the system zero page. */
797 if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
798 vmf->page = ZERO_PAGE(vmf->address);
799 get_page(vmf->page);
800 return 0;
801 }
802
803 mutex_lock(&ufile->umap_lock);
804 if (!ufile->disassociate_page)
805 ufile->disassociate_page =
806 alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
807
808 if (ufile->disassociate_page) {
809 /*
810 * This VMA is forced to always be shared so this doesn't have
811 * to worry about COW.
812 */
813 vmf->page = ufile->disassociate_page;
814 get_page(vmf->page);
815 } else {
816 ret = VM_FAULT_SIGBUS;
817 }
818 mutex_unlock(&ufile->umap_lock);
819
820 return ret;
821}
822
823static const struct vm_operations_struct rdma_umap_ops = {
824 .open = rdma_umap_open,
825 .close = rdma_umap_close,
826 .fault = rdma_umap_fault,
827};
828
829void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
830{
831 struct rdma_umap_priv *priv, *next_priv;
832
833 mutex_lock(&ufile->disassociation_lock);
834
835 while (1) {
836 struct mm_struct *mm = NULL;
837
838 /* Get an arbitrary mm pointer that hasn't been cleaned yet */
839 mutex_lock(&ufile->umap_lock);
840 while (!list_empty(&ufile->umaps)) {
841 int ret;
842
843 priv = list_first_entry(&ufile->umaps,
844 struct rdma_umap_priv, list);
845 mm = priv->vma->vm_mm;
846 ret = mmget_not_zero(mm);
847 if (!ret) {
848 list_del_init(&priv->list);
849 if (priv->entry) {
850 rdma_user_mmap_entry_put(priv->entry);
851 priv->entry = NULL;
852 }
853 mm = NULL;
854 continue;
855 }
856 break;
857 }
858 mutex_unlock(&ufile->umap_lock);
859 if (!mm) {
860 mutex_unlock(&ufile->disassociation_lock);
861 return;
862 }
863
864 /*
865 * The umap_lock is nested under mmap_lock since it used within
866 * the vma_ops callbacks, so we have to clean the list one mm
867 * at a time to get the lock ordering right. Typically there
868 * will only be one mm, so no big deal.
869 */
870 mmap_read_lock(mm);
871 mutex_lock(&ufile->umap_lock);
872 list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
873 list) {
874 struct vm_area_struct *vma = priv->vma;
875
876 if (vma->vm_mm != mm)
877 continue;
878 list_del_init(&priv->list);
879
880 zap_vma_ptes(vma, vma->vm_start,
881 vma->vm_end - vma->vm_start);
882
883 if (priv->entry) {
884 rdma_user_mmap_entry_put(priv->entry);
885 priv->entry = NULL;
886 }
887 }
888 mutex_unlock(&ufile->umap_lock);
889 mmap_read_unlock(mm);
890 mmput(mm);
891 }
892
893 mutex_unlock(&ufile->disassociation_lock);
894}
895
896/**
897 * rdma_user_mmap_disassociate() - Revoke mmaps for a device
898 * @device: device to revoke
899 *
900 * This function should be called by drivers that need to disable mmaps for the
901 * device, for instance because it is going to be reset.
902 */
903void rdma_user_mmap_disassociate(struct ib_device *device)
904{
905 struct ib_uverbs_device *uverbs_dev =
906 ib_get_client_data(device, &uverbs_client);
907 struct ib_uverbs_file *ufile;
908
909 mutex_lock(&uverbs_dev->lists_mutex);
910 list_for_each_entry(ufile, &uverbs_dev->uverbs_file_list, list) {
911 if (ufile->ucontext)
912 uverbs_user_mmap_disassociate(ufile);
913 }
914 mutex_unlock(&uverbs_dev->lists_mutex);
915}
916EXPORT_SYMBOL(rdma_user_mmap_disassociate);
917
918/*
919 * ib_uverbs_open() does not need the BKL:
920 *
921 * - the ib_uverbs_device structures are properly reference counted and
922 * everything else is purely local to the file being created, so
923 * races against other open calls are not a problem;
924 * - there is no ioctl method to race against;
925 * - the open method will either immediately run -ENXIO, or all
926 * required initialization will be done.
927 */
928static int ib_uverbs_open(struct inode *inode, struct file *filp)
929{
930 struct ib_uverbs_device *dev;
931 struct ib_uverbs_file *file;
932 struct ib_device *ib_dev;
933 int ret;
934 int module_dependent;
935 int srcu_key;
936
937 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
938 if (!refcount_inc_not_zero(&dev->refcount))
939 return -ENXIO;
940
941 get_device(&dev->dev);
942 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
943 mutex_lock(&dev->lists_mutex);
944 ib_dev = srcu_dereference(dev->ib_dev,
945 &dev->disassociate_srcu);
946 if (!ib_dev) {
947 ret = -EIO;
948 goto err;
949 }
950
951 if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
952 ret = -EPERM;
953 goto err;
954 }
955
956 /* In case IB device supports disassociate ucontext, there is no hard
957 * dependency between uverbs device and its low level device.
958 */
959 module_dependent = !(ib_dev->ops.disassociate_ucontext);
960
961 if (module_dependent) {
962 if (!try_module_get(ib_dev->ops.owner)) {
963 ret = -ENODEV;
964 goto err;
965 }
966 }
967
968 file = kzalloc(sizeof(*file), GFP_KERNEL);
969 if (!file) {
970 ret = -ENOMEM;
971 if (module_dependent)
972 goto err_module;
973
974 goto err;
975 }
976
977 file->device = dev;
978 kref_init(&file->ref);
979 mutex_init(&file->ucontext_lock);
980
981 spin_lock_init(&file->uobjects_lock);
982 INIT_LIST_HEAD(&file->uobjects);
983 init_rwsem(&file->hw_destroy_rwsem);
984 mutex_init(&file->umap_lock);
985 INIT_LIST_HEAD(&file->umaps);
986
987 mutex_init(&file->disassociation_lock);
988
989 filp->private_data = file;
990 list_add_tail(&file->list, &dev->uverbs_file_list);
991 mutex_unlock(&dev->lists_mutex);
992 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
993
994 setup_ufile_idr_uobject(file);
995
996 return stream_open(inode, filp);
997
998err_module:
999 module_put(ib_dev->ops.owner);
1000
1001err:
1002 mutex_unlock(&dev->lists_mutex);
1003 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1004 if (refcount_dec_and_test(&dev->refcount))
1005 ib_uverbs_comp_dev(dev);
1006
1007 put_device(&dev->dev);
1008 return ret;
1009}
1010
1011static int ib_uverbs_close(struct inode *inode, struct file *filp)
1012{
1013 struct ib_uverbs_file *file = filp->private_data;
1014
1015 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
1016
1017 mutex_lock(&file->device->lists_mutex);
1018 list_del_init(&file->list);
1019 mutex_unlock(&file->device->lists_mutex);
1020
1021 kref_put(&file->ref, ib_uverbs_release_file);
1022
1023 return 0;
1024}
1025
1026static const struct file_operations uverbs_fops = {
1027 .owner = THIS_MODULE,
1028 .write = ib_uverbs_write,
1029 .open = ib_uverbs_open,
1030 .release = ib_uverbs_close,
1031 .unlocked_ioctl = ib_uverbs_ioctl,
1032 .compat_ioctl = compat_ptr_ioctl,
1033};
1034
1035static const struct file_operations uverbs_mmap_fops = {
1036 .owner = THIS_MODULE,
1037 .write = ib_uverbs_write,
1038 .mmap = ib_uverbs_mmap,
1039 .open = ib_uverbs_open,
1040 .release = ib_uverbs_close,
1041 .unlocked_ioctl = ib_uverbs_ioctl,
1042 .compat_ioctl = compat_ptr_ioctl,
1043};
1044
1045static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1046 struct ib_client_nl_info *res)
1047{
1048 struct ib_uverbs_device *uverbs_dev = client_data;
1049 int ret;
1050
1051 if (res->port != -1)
1052 return -EINVAL;
1053
1054 res->abi = ibdev->ops.uverbs_abi_ver;
1055 res->cdev = &uverbs_dev->dev;
1056
1057 /*
1058 * To support DRIVER_ID binding in userspace some of the driver need
1059 * upgrading to expose their PCI dependent revision information
1060 * through get_context instead of relying on modalias matching. When
1061 * the drivers are fixed they can drop this flag.
1062 */
1063 if (!ibdev->ops.uverbs_no_driver_id_binding) {
1064 ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1065 ibdev->ops.driver_id);
1066 if (ret)
1067 return ret;
1068 }
1069 return 0;
1070}
1071
1072static struct ib_client uverbs_client = {
1073 .name = "uverbs",
1074 .no_kverbs_req = true,
1075 .add = ib_uverbs_add_one,
1076 .remove = ib_uverbs_remove_one,
1077 .get_nl_info = ib_uverbs_get_nl_info,
1078};
1079MODULE_ALIAS_RDMA_CLIENT("uverbs");
1080
1081static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1082 char *buf)
1083{
1084 struct ib_uverbs_device *dev =
1085 container_of(device, struct ib_uverbs_device, dev);
1086 int ret = -ENODEV;
1087 int srcu_key;
1088 struct ib_device *ib_dev;
1089
1090 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1091 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1092 if (ib_dev)
1093 ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev));
1094 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1095
1096 return ret;
1097}
1098static DEVICE_ATTR_RO(ibdev);
1099
1100static ssize_t abi_version_show(struct device *device,
1101 struct device_attribute *attr, char *buf)
1102{
1103 struct ib_uverbs_device *dev =
1104 container_of(device, struct ib_uverbs_device, dev);
1105 int ret = -ENODEV;
1106 int srcu_key;
1107 struct ib_device *ib_dev;
1108
1109 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1110 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1111 if (ib_dev)
1112 ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1113 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1114
1115 return ret;
1116}
1117static DEVICE_ATTR_RO(abi_version);
1118
1119static struct attribute *ib_dev_attrs[] = {
1120 &dev_attr_abi_version.attr,
1121 &dev_attr_ibdev.attr,
1122 NULL,
1123};
1124
1125static const struct attribute_group dev_attr_group = {
1126 .attrs = ib_dev_attrs,
1127};
1128
1129static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1130 __stringify(IB_USER_VERBS_ABI_VERSION));
1131
1132static int ib_uverbs_create_uapi(struct ib_device *device,
1133 struct ib_uverbs_device *uverbs_dev)
1134{
1135 struct uverbs_api *uapi;
1136
1137 uapi = uverbs_alloc_api(device);
1138 if (IS_ERR(uapi))
1139 return PTR_ERR(uapi);
1140
1141 uverbs_dev->uapi = uapi;
1142 return 0;
1143}
1144
1145static int ib_uverbs_add_one(struct ib_device *device)
1146{
1147 int devnum;
1148 dev_t base;
1149 struct ib_uverbs_device *uverbs_dev;
1150 int ret;
1151
1152 if (!device->ops.alloc_ucontext ||
1153 device->type == RDMA_DEVICE_TYPE_SMI)
1154 return -EOPNOTSUPP;
1155
1156 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1157 if (!uverbs_dev)
1158 return -ENOMEM;
1159
1160 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1161 if (ret) {
1162 kfree(uverbs_dev);
1163 return -ENOMEM;
1164 }
1165
1166 device_initialize(&uverbs_dev->dev);
1167 uverbs_dev->dev.class = &uverbs_class;
1168 uverbs_dev->dev.parent = device->dev.parent;
1169 uverbs_dev->dev.release = ib_uverbs_release_dev;
1170 uverbs_dev->groups[0] = &dev_attr_group;
1171 uverbs_dev->dev.groups = uverbs_dev->groups;
1172 refcount_set(&uverbs_dev->refcount, 1);
1173 init_completion(&uverbs_dev->comp);
1174 uverbs_dev->xrcd_tree = RB_ROOT;
1175 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1176 mutex_init(&uverbs_dev->lists_mutex);
1177 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1178 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1179 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1180
1181 devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1182 GFP_KERNEL);
1183 if (devnum < 0) {
1184 ret = -ENOMEM;
1185 goto err;
1186 }
1187 uverbs_dev->devnum = devnum;
1188 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1189 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1190 else
1191 base = IB_UVERBS_BASE_DEV + devnum;
1192
1193 ret = ib_uverbs_create_uapi(device, uverbs_dev);
1194 if (ret)
1195 goto err_uapi;
1196
1197 uverbs_dev->dev.devt = base;
1198 dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1199
1200 cdev_init(&uverbs_dev->cdev,
1201 device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1202 uverbs_dev->cdev.owner = THIS_MODULE;
1203
1204 ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1205 if (ret)
1206 goto err_uapi;
1207
1208 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1209 return 0;
1210
1211err_uapi:
1212 ida_free(&uverbs_ida, devnum);
1213err:
1214 if (refcount_dec_and_test(&uverbs_dev->refcount))
1215 ib_uverbs_comp_dev(uverbs_dev);
1216 wait_for_completion(&uverbs_dev->comp);
1217 put_device(&uverbs_dev->dev);
1218 return ret;
1219}
1220
1221static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1222 struct ib_device *ib_dev)
1223{
1224 struct ib_uverbs_file *file;
1225
1226 /* Pending running commands to terminate */
1227 uverbs_disassociate_api_pre(uverbs_dev);
1228
1229 mutex_lock(&uverbs_dev->lists_mutex);
1230 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1231 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1232 struct ib_uverbs_file, list);
1233 list_del_init(&file->list);
1234 kref_get(&file->ref);
1235
1236 /* We must release the mutex before going ahead and calling
1237 * uverbs_cleanup_ufile, as it might end up indirectly calling
1238 * uverbs_close, for example due to freeing the resources (e.g
1239 * mmput).
1240 */
1241 mutex_unlock(&uverbs_dev->lists_mutex);
1242
1243 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1244 kref_put(&file->ref, ib_uverbs_release_file);
1245
1246 mutex_lock(&uverbs_dev->lists_mutex);
1247 }
1248 mutex_unlock(&uverbs_dev->lists_mutex);
1249
1250 uverbs_disassociate_api(uverbs_dev->uapi);
1251}
1252
1253static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1254{
1255 struct ib_uverbs_device *uverbs_dev = client_data;
1256 int wait_clients = 1;
1257
1258 cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1259 ida_free(&uverbs_ida, uverbs_dev->devnum);
1260
1261 if (device->ops.disassociate_ucontext) {
1262 /* We disassociate HW resources and immediately return.
1263 * Userspace will see a EIO errno for all future access.
1264 * Upon returning, ib_device may be freed internally and is not
1265 * valid any more.
1266 * uverbs_device is still available until all clients close
1267 * their files, then the uverbs device ref count will be zero
1268 * and its resources will be freed.
1269 * Note: At this point no more files can be opened since the
1270 * cdev was deleted, however active clients can still issue
1271 * commands and close their open files.
1272 */
1273 ib_uverbs_free_hw_resources(uverbs_dev, device);
1274 wait_clients = 0;
1275 }
1276
1277 if (refcount_dec_and_test(&uverbs_dev->refcount))
1278 ib_uverbs_comp_dev(uverbs_dev);
1279 if (wait_clients)
1280 wait_for_completion(&uverbs_dev->comp);
1281
1282 put_device(&uverbs_dev->dev);
1283}
1284
1285static int __init ib_uverbs_init(void)
1286{
1287 int ret;
1288
1289 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1290 IB_UVERBS_NUM_FIXED_MINOR,
1291 "infiniband_verbs");
1292 if (ret) {
1293 pr_err("user_verbs: couldn't register device number\n");
1294 goto out;
1295 }
1296
1297 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1298 IB_UVERBS_NUM_DYNAMIC_MINOR,
1299 "infiniband_verbs");
1300 if (ret) {
1301 pr_err("couldn't register dynamic device number\n");
1302 goto out_alloc;
1303 }
1304
1305 ret = class_register(&uverbs_class);
1306 if (ret) {
1307 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1308 goto out_chrdev;
1309 }
1310
1311 ret = class_create_file(&uverbs_class, &class_attr_abi_version.attr);
1312 if (ret) {
1313 pr_err("user_verbs: couldn't create abi_version attribute\n");
1314 goto out_class;
1315 }
1316
1317 ret = ib_register_client(&uverbs_client);
1318 if (ret) {
1319 pr_err("user_verbs: couldn't register client\n");
1320 goto out_class;
1321 }
1322
1323 return 0;
1324
1325out_class:
1326 class_unregister(&uverbs_class);
1327
1328out_chrdev:
1329 unregister_chrdev_region(dynamic_uverbs_dev,
1330 IB_UVERBS_NUM_DYNAMIC_MINOR);
1331
1332out_alloc:
1333 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1334 IB_UVERBS_NUM_FIXED_MINOR);
1335
1336out:
1337 return ret;
1338}
1339
1340static void __exit ib_uverbs_cleanup(void)
1341{
1342 ib_unregister_client(&uverbs_client);
1343 class_unregister(&uverbs_class);
1344 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1345 IB_UVERBS_NUM_FIXED_MINOR);
1346 unregister_chrdev_region(dynamic_uverbs_dev,
1347 IB_UVERBS_NUM_DYNAMIC_MINOR);
1348 mmu_notifier_synchronize();
1349}
1350
1351module_init(ib_uverbs_init);
1352module_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);