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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);
79
80static char *uverbs_devnode(const struct device *dev, umode_t *mode)
81{
82 if (mode)
83 *mode = 0666;
84 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
85}
86
87static const struct class uverbs_class = {
88 .name = "infiniband_verbs",
89 .devnode = uverbs_devnode,
90};
91
92/*
93 * Must be called with the ufile->device->disassociate_srcu held, and the lock
94 * must be held until use of the ucontext is finished.
95 */
96struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
97{
98 /*
99 * We do not hold the hw_destroy_rwsem lock for this flow, instead
100 * srcu is used. It does not matter if someone races this with
101 * get_context, we get NULL or valid ucontext.
102 */
103 struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
104
105 if (!srcu_dereference(ufile->device->ib_dev,
106 &ufile->device->disassociate_srcu))
107 return ERR_PTR(-EIO);
108
109 if (!ucontext)
110 return ERR_PTR(-EINVAL);
111
112 return ucontext;
113}
114EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
115
116int uverbs_dealloc_mw(struct ib_mw *mw)
117{
118 struct ib_pd *pd = mw->pd;
119 int ret;
120
121 ret = mw->device->ops.dealloc_mw(mw);
122 if (ret)
123 return ret;
124
125 atomic_dec(&pd->usecnt);
126 kfree(mw);
127 return ret;
128}
129
130static void ib_uverbs_release_dev(struct device *device)
131{
132 struct ib_uverbs_device *dev =
133 container_of(device, struct ib_uverbs_device, dev);
134
135 uverbs_destroy_api(dev->uapi);
136 cleanup_srcu_struct(&dev->disassociate_srcu);
137 mutex_destroy(&dev->lists_mutex);
138 mutex_destroy(&dev->xrcd_tree_mutex);
139 kfree(dev);
140}
141
142void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
143 struct ib_ucq_object *uobj)
144{
145 struct ib_uverbs_event *evt, *tmp;
146
147 if (ev_file) {
148 spin_lock_irq(&ev_file->ev_queue.lock);
149 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
150 list_del(&evt->list);
151 kfree(evt);
152 }
153 spin_unlock_irq(&ev_file->ev_queue.lock);
154
155 uverbs_uobject_put(&ev_file->uobj);
156 }
157
158 ib_uverbs_release_uevent(&uobj->uevent);
159}
160
161void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
162{
163 struct ib_uverbs_async_event_file *async_file = uobj->event_file;
164 struct ib_uverbs_event *evt, *tmp;
165
166 if (!async_file)
167 return;
168
169 spin_lock_irq(&async_file->ev_queue.lock);
170 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
171 list_del(&evt->list);
172 kfree(evt);
173 }
174 spin_unlock_irq(&async_file->ev_queue.lock);
175 uverbs_uobject_put(&async_file->uobj);
176}
177
178void ib_uverbs_detach_umcast(struct ib_qp *qp,
179 struct ib_uqp_object *uobj)
180{
181 struct ib_uverbs_mcast_entry *mcast, *tmp;
182
183 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
184 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
185 list_del(&mcast->list);
186 kfree(mcast);
187 }
188}
189
190static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
191{
192 complete(&dev->comp);
193}
194
195void ib_uverbs_release_file(struct kref *ref)
196{
197 struct ib_uverbs_file *file =
198 container_of(ref, struct ib_uverbs_file, ref);
199 struct ib_device *ib_dev;
200 int srcu_key;
201
202 release_ufile_idr_uobject(file);
203
204 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
205 ib_dev = srcu_dereference(file->device->ib_dev,
206 &file->device->disassociate_srcu);
207 if (ib_dev && !ib_dev->ops.disassociate_ucontext)
208 module_put(ib_dev->ops.owner);
209 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
210
211 if (refcount_dec_and_test(&file->device->refcount))
212 ib_uverbs_comp_dev(file->device);
213
214 if (file->default_async_file)
215 uverbs_uobject_put(&file->default_async_file->uobj);
216 put_device(&file->device->dev);
217
218 if (file->disassociate_page)
219 __free_pages(file->disassociate_page, 0);
220 mutex_destroy(&file->umap_lock);
221 mutex_destroy(&file->ucontext_lock);
222 kfree(file);
223}
224
225static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
226 struct file *filp, char __user *buf,
227 size_t count, loff_t *pos,
228 size_t eventsz)
229{
230 struct ib_uverbs_event *event;
231 int ret = 0;
232
233 spin_lock_irq(&ev_queue->lock);
234
235 while (list_empty(&ev_queue->event_list)) {
236 if (ev_queue->is_closed) {
237 spin_unlock_irq(&ev_queue->lock);
238 return -EIO;
239 }
240
241 spin_unlock_irq(&ev_queue->lock);
242 if (filp->f_flags & O_NONBLOCK)
243 return -EAGAIN;
244
245 if (wait_event_interruptible(ev_queue->poll_wait,
246 (!list_empty(&ev_queue->event_list) ||
247 ev_queue->is_closed)))
248 return -ERESTARTSYS;
249
250 spin_lock_irq(&ev_queue->lock);
251 }
252
253 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
254
255 if (eventsz > count) {
256 ret = -EINVAL;
257 event = NULL;
258 } else {
259 list_del(ev_queue->event_list.next);
260 if (event->counter) {
261 ++(*event->counter);
262 list_del(&event->obj_list);
263 }
264 }
265
266 spin_unlock_irq(&ev_queue->lock);
267
268 if (event) {
269 if (copy_to_user(buf, event, eventsz))
270 ret = -EFAULT;
271 else
272 ret = eventsz;
273 }
274
275 kfree(event);
276
277 return ret;
278}
279
280static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
281 size_t count, loff_t *pos)
282{
283 struct ib_uverbs_async_event_file *file = filp->private_data;
284
285 return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
286 sizeof(struct ib_uverbs_async_event_desc));
287}
288
289static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
290 size_t count, loff_t *pos)
291{
292 struct ib_uverbs_completion_event_file *comp_ev_file =
293 filp->private_data;
294
295 return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
296 pos,
297 sizeof(struct ib_uverbs_comp_event_desc));
298}
299
300static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
301 struct file *filp,
302 struct poll_table_struct *wait)
303{
304 __poll_t pollflags = 0;
305
306 poll_wait(filp, &ev_queue->poll_wait, wait);
307
308 spin_lock_irq(&ev_queue->lock);
309 if (!list_empty(&ev_queue->event_list))
310 pollflags = EPOLLIN | EPOLLRDNORM;
311 else if (ev_queue->is_closed)
312 pollflags = EPOLLERR;
313 spin_unlock_irq(&ev_queue->lock);
314
315 return pollflags;
316}
317
318static __poll_t ib_uverbs_async_event_poll(struct file *filp,
319 struct poll_table_struct *wait)
320{
321 struct ib_uverbs_async_event_file *file = filp->private_data;
322
323 return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
324}
325
326static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
327 struct poll_table_struct *wait)
328{
329 struct ib_uverbs_completion_event_file *comp_ev_file =
330 filp->private_data;
331
332 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
333}
334
335static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
336{
337 struct ib_uverbs_async_event_file *file = filp->private_data;
338
339 return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
340}
341
342static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
343{
344 struct ib_uverbs_completion_event_file *comp_ev_file =
345 filp->private_data;
346
347 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
348}
349
350const struct file_operations uverbs_event_fops = {
351 .owner = THIS_MODULE,
352 .read = ib_uverbs_comp_event_read,
353 .poll = ib_uverbs_comp_event_poll,
354 .release = uverbs_uobject_fd_release,
355 .fasync = ib_uverbs_comp_event_fasync,
356 .llseek = no_llseek,
357};
358
359const struct file_operations uverbs_async_event_fops = {
360 .owner = THIS_MODULE,
361 .read = ib_uverbs_async_event_read,
362 .poll = ib_uverbs_async_event_poll,
363 .release = uverbs_async_event_release,
364 .fasync = ib_uverbs_async_event_fasync,
365 .llseek = no_llseek,
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 vma->vm_ops = &rdma_umap_ops;
704 ret = ucontext->device->ops.mmap(ucontext, vma);
705out:
706 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
707 return ret;
708}
709
710/*
711 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
712 * struct
713 */
714static void rdma_umap_open(struct vm_area_struct *vma)
715{
716 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
717 struct rdma_umap_priv *opriv = vma->vm_private_data;
718 struct rdma_umap_priv *priv;
719
720 if (!opriv)
721 return;
722
723 /* We are racing with disassociation */
724 if (!down_read_trylock(&ufile->hw_destroy_rwsem))
725 goto out_zap;
726 /*
727 * Disassociation already completed, the VMA should already be zapped.
728 */
729 if (!ufile->ucontext)
730 goto out_unlock;
731
732 priv = kzalloc(sizeof(*priv), GFP_KERNEL);
733 if (!priv)
734 goto out_unlock;
735 rdma_umap_priv_init(priv, vma, opriv->entry);
736
737 up_read(&ufile->hw_destroy_rwsem);
738 return;
739
740out_unlock:
741 up_read(&ufile->hw_destroy_rwsem);
742out_zap:
743 /*
744 * We can't allow the VMA to be created with the actual IO pages, that
745 * would break our API contract, and it can't be stopped at this
746 * point, so zap it.
747 */
748 vma->vm_private_data = NULL;
749 zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
750}
751
752static void rdma_umap_close(struct vm_area_struct *vma)
753{
754 struct ib_uverbs_file *ufile = vma->vm_file->private_data;
755 struct rdma_umap_priv *priv = vma->vm_private_data;
756
757 if (!priv)
758 return;
759
760 /*
761 * The vma holds a reference on the struct file that created it, which
762 * in turn means that the ib_uverbs_file is guaranteed to exist at
763 * this point.
764 */
765 mutex_lock(&ufile->umap_lock);
766 if (priv->entry)
767 rdma_user_mmap_entry_put(priv->entry);
768
769 list_del(&priv->list);
770 mutex_unlock(&ufile->umap_lock);
771 kfree(priv);
772}
773
774/*
775 * Once the zap_vma_ptes has been called touches to the VMA will come here and
776 * we return a dummy writable zero page for all the pfns.
777 */
778static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
779{
780 struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
781 struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
782 vm_fault_t ret = 0;
783
784 if (!priv)
785 return VM_FAULT_SIGBUS;
786
787 /* Read only pages can just use the system zero page. */
788 if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
789 vmf->page = ZERO_PAGE(vmf->address);
790 get_page(vmf->page);
791 return 0;
792 }
793
794 mutex_lock(&ufile->umap_lock);
795 if (!ufile->disassociate_page)
796 ufile->disassociate_page =
797 alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
798
799 if (ufile->disassociate_page) {
800 /*
801 * This VMA is forced to always be shared so this doesn't have
802 * to worry about COW.
803 */
804 vmf->page = ufile->disassociate_page;
805 get_page(vmf->page);
806 } else {
807 ret = VM_FAULT_SIGBUS;
808 }
809 mutex_unlock(&ufile->umap_lock);
810
811 return ret;
812}
813
814static const struct vm_operations_struct rdma_umap_ops = {
815 .open = rdma_umap_open,
816 .close = rdma_umap_close,
817 .fault = rdma_umap_fault,
818};
819
820void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
821{
822 struct rdma_umap_priv *priv, *next_priv;
823
824 lockdep_assert_held(&ufile->hw_destroy_rwsem);
825
826 while (1) {
827 struct mm_struct *mm = NULL;
828
829 /* Get an arbitrary mm pointer that hasn't been cleaned yet */
830 mutex_lock(&ufile->umap_lock);
831 while (!list_empty(&ufile->umaps)) {
832 int ret;
833
834 priv = list_first_entry(&ufile->umaps,
835 struct rdma_umap_priv, list);
836 mm = priv->vma->vm_mm;
837 ret = mmget_not_zero(mm);
838 if (!ret) {
839 list_del_init(&priv->list);
840 if (priv->entry) {
841 rdma_user_mmap_entry_put(priv->entry);
842 priv->entry = NULL;
843 }
844 mm = NULL;
845 continue;
846 }
847 break;
848 }
849 mutex_unlock(&ufile->umap_lock);
850 if (!mm)
851 return;
852
853 /*
854 * The umap_lock is nested under mmap_lock since it used within
855 * the vma_ops callbacks, so we have to clean the list one mm
856 * at a time to get the lock ordering right. Typically there
857 * will only be one mm, so no big deal.
858 */
859 mmap_read_lock(mm);
860 mutex_lock(&ufile->umap_lock);
861 list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
862 list) {
863 struct vm_area_struct *vma = priv->vma;
864
865 if (vma->vm_mm != mm)
866 continue;
867 list_del_init(&priv->list);
868
869 zap_vma_ptes(vma, vma->vm_start,
870 vma->vm_end - vma->vm_start);
871
872 if (priv->entry) {
873 rdma_user_mmap_entry_put(priv->entry);
874 priv->entry = NULL;
875 }
876 }
877 mutex_unlock(&ufile->umap_lock);
878 mmap_read_unlock(mm);
879 mmput(mm);
880 }
881}
882
883/*
884 * ib_uverbs_open() does not need the BKL:
885 *
886 * - the ib_uverbs_device structures are properly reference counted and
887 * everything else is purely local to the file being created, so
888 * races against other open calls are not a problem;
889 * - there is no ioctl method to race against;
890 * - the open method will either immediately run -ENXIO, or all
891 * required initialization will be done.
892 */
893static int ib_uverbs_open(struct inode *inode, struct file *filp)
894{
895 struct ib_uverbs_device *dev;
896 struct ib_uverbs_file *file;
897 struct ib_device *ib_dev;
898 int ret;
899 int module_dependent;
900 int srcu_key;
901
902 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
903 if (!refcount_inc_not_zero(&dev->refcount))
904 return -ENXIO;
905
906 get_device(&dev->dev);
907 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
908 mutex_lock(&dev->lists_mutex);
909 ib_dev = srcu_dereference(dev->ib_dev,
910 &dev->disassociate_srcu);
911 if (!ib_dev) {
912 ret = -EIO;
913 goto err;
914 }
915
916 if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
917 ret = -EPERM;
918 goto err;
919 }
920
921 /* In case IB device supports disassociate ucontext, there is no hard
922 * dependency between uverbs device and its low level device.
923 */
924 module_dependent = !(ib_dev->ops.disassociate_ucontext);
925
926 if (module_dependent) {
927 if (!try_module_get(ib_dev->ops.owner)) {
928 ret = -ENODEV;
929 goto err;
930 }
931 }
932
933 file = kzalloc(sizeof(*file), GFP_KERNEL);
934 if (!file) {
935 ret = -ENOMEM;
936 if (module_dependent)
937 goto err_module;
938
939 goto err;
940 }
941
942 file->device = dev;
943 kref_init(&file->ref);
944 mutex_init(&file->ucontext_lock);
945
946 spin_lock_init(&file->uobjects_lock);
947 INIT_LIST_HEAD(&file->uobjects);
948 init_rwsem(&file->hw_destroy_rwsem);
949 mutex_init(&file->umap_lock);
950 INIT_LIST_HEAD(&file->umaps);
951
952 filp->private_data = file;
953 list_add_tail(&file->list, &dev->uverbs_file_list);
954 mutex_unlock(&dev->lists_mutex);
955 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
956
957 setup_ufile_idr_uobject(file);
958
959 return stream_open(inode, filp);
960
961err_module:
962 module_put(ib_dev->ops.owner);
963
964err:
965 mutex_unlock(&dev->lists_mutex);
966 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
967 if (refcount_dec_and_test(&dev->refcount))
968 ib_uverbs_comp_dev(dev);
969
970 put_device(&dev->dev);
971 return ret;
972}
973
974static int ib_uverbs_close(struct inode *inode, struct file *filp)
975{
976 struct ib_uverbs_file *file = filp->private_data;
977
978 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
979
980 mutex_lock(&file->device->lists_mutex);
981 list_del_init(&file->list);
982 mutex_unlock(&file->device->lists_mutex);
983
984 kref_put(&file->ref, ib_uverbs_release_file);
985
986 return 0;
987}
988
989static const struct file_operations uverbs_fops = {
990 .owner = THIS_MODULE,
991 .write = ib_uverbs_write,
992 .open = ib_uverbs_open,
993 .release = ib_uverbs_close,
994 .llseek = no_llseek,
995 .unlocked_ioctl = ib_uverbs_ioctl,
996 .compat_ioctl = compat_ptr_ioctl,
997};
998
999static const struct file_operations uverbs_mmap_fops = {
1000 .owner = THIS_MODULE,
1001 .write = ib_uverbs_write,
1002 .mmap = ib_uverbs_mmap,
1003 .open = ib_uverbs_open,
1004 .release = ib_uverbs_close,
1005 .llseek = no_llseek,
1006 .unlocked_ioctl = ib_uverbs_ioctl,
1007 .compat_ioctl = compat_ptr_ioctl,
1008};
1009
1010static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1011 struct ib_client_nl_info *res)
1012{
1013 struct ib_uverbs_device *uverbs_dev = client_data;
1014 int ret;
1015
1016 if (res->port != -1)
1017 return -EINVAL;
1018
1019 res->abi = ibdev->ops.uverbs_abi_ver;
1020 res->cdev = &uverbs_dev->dev;
1021
1022 /*
1023 * To support DRIVER_ID binding in userspace some of the driver need
1024 * upgrading to expose their PCI dependent revision information
1025 * through get_context instead of relying on modalias matching. When
1026 * the drivers are fixed they can drop this flag.
1027 */
1028 if (!ibdev->ops.uverbs_no_driver_id_binding) {
1029 ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1030 ibdev->ops.driver_id);
1031 if (ret)
1032 return ret;
1033 }
1034 return 0;
1035}
1036
1037static struct ib_client uverbs_client = {
1038 .name = "uverbs",
1039 .no_kverbs_req = true,
1040 .add = ib_uverbs_add_one,
1041 .remove = ib_uverbs_remove_one,
1042 .get_nl_info = ib_uverbs_get_nl_info,
1043};
1044MODULE_ALIAS_RDMA_CLIENT("uverbs");
1045
1046static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1047 char *buf)
1048{
1049 struct ib_uverbs_device *dev =
1050 container_of(device, struct ib_uverbs_device, dev);
1051 int ret = -ENODEV;
1052 int srcu_key;
1053 struct ib_device *ib_dev;
1054
1055 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1056 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1057 if (ib_dev)
1058 ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev));
1059 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1060
1061 return ret;
1062}
1063static DEVICE_ATTR_RO(ibdev);
1064
1065static ssize_t abi_version_show(struct device *device,
1066 struct device_attribute *attr, char *buf)
1067{
1068 struct ib_uverbs_device *dev =
1069 container_of(device, struct ib_uverbs_device, dev);
1070 int ret = -ENODEV;
1071 int srcu_key;
1072 struct ib_device *ib_dev;
1073
1074 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1075 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1076 if (ib_dev)
1077 ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1078 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1079
1080 return ret;
1081}
1082static DEVICE_ATTR_RO(abi_version);
1083
1084static struct attribute *ib_dev_attrs[] = {
1085 &dev_attr_abi_version.attr,
1086 &dev_attr_ibdev.attr,
1087 NULL,
1088};
1089
1090static const struct attribute_group dev_attr_group = {
1091 .attrs = ib_dev_attrs,
1092};
1093
1094static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1095 __stringify(IB_USER_VERBS_ABI_VERSION));
1096
1097static int ib_uverbs_create_uapi(struct ib_device *device,
1098 struct ib_uverbs_device *uverbs_dev)
1099{
1100 struct uverbs_api *uapi;
1101
1102 uapi = uverbs_alloc_api(device);
1103 if (IS_ERR(uapi))
1104 return PTR_ERR(uapi);
1105
1106 uverbs_dev->uapi = uapi;
1107 return 0;
1108}
1109
1110static int ib_uverbs_add_one(struct ib_device *device)
1111{
1112 int devnum;
1113 dev_t base;
1114 struct ib_uverbs_device *uverbs_dev;
1115 int ret;
1116
1117 if (!device->ops.alloc_ucontext)
1118 return -EOPNOTSUPP;
1119
1120 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1121 if (!uverbs_dev)
1122 return -ENOMEM;
1123
1124 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1125 if (ret) {
1126 kfree(uverbs_dev);
1127 return -ENOMEM;
1128 }
1129
1130 device_initialize(&uverbs_dev->dev);
1131 uverbs_dev->dev.class = &uverbs_class;
1132 uverbs_dev->dev.parent = device->dev.parent;
1133 uverbs_dev->dev.release = ib_uverbs_release_dev;
1134 uverbs_dev->groups[0] = &dev_attr_group;
1135 uverbs_dev->dev.groups = uverbs_dev->groups;
1136 refcount_set(&uverbs_dev->refcount, 1);
1137 init_completion(&uverbs_dev->comp);
1138 uverbs_dev->xrcd_tree = RB_ROOT;
1139 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1140 mutex_init(&uverbs_dev->lists_mutex);
1141 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1142 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1143 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1144
1145 devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1146 GFP_KERNEL);
1147 if (devnum < 0) {
1148 ret = -ENOMEM;
1149 goto err;
1150 }
1151 uverbs_dev->devnum = devnum;
1152 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1153 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1154 else
1155 base = IB_UVERBS_BASE_DEV + devnum;
1156
1157 ret = ib_uverbs_create_uapi(device, uverbs_dev);
1158 if (ret)
1159 goto err_uapi;
1160
1161 uverbs_dev->dev.devt = base;
1162 dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1163
1164 cdev_init(&uverbs_dev->cdev,
1165 device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1166 uverbs_dev->cdev.owner = THIS_MODULE;
1167
1168 ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1169 if (ret)
1170 goto err_uapi;
1171
1172 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1173 return 0;
1174
1175err_uapi:
1176 ida_free(&uverbs_ida, devnum);
1177err:
1178 if (refcount_dec_and_test(&uverbs_dev->refcount))
1179 ib_uverbs_comp_dev(uverbs_dev);
1180 wait_for_completion(&uverbs_dev->comp);
1181 put_device(&uverbs_dev->dev);
1182 return ret;
1183}
1184
1185static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1186 struct ib_device *ib_dev)
1187{
1188 struct ib_uverbs_file *file;
1189
1190 /* Pending running commands to terminate */
1191 uverbs_disassociate_api_pre(uverbs_dev);
1192
1193 mutex_lock(&uverbs_dev->lists_mutex);
1194 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1195 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1196 struct ib_uverbs_file, list);
1197 list_del_init(&file->list);
1198 kref_get(&file->ref);
1199
1200 /* We must release the mutex before going ahead and calling
1201 * uverbs_cleanup_ufile, as it might end up indirectly calling
1202 * uverbs_close, for example due to freeing the resources (e.g
1203 * mmput).
1204 */
1205 mutex_unlock(&uverbs_dev->lists_mutex);
1206
1207 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1208 kref_put(&file->ref, ib_uverbs_release_file);
1209
1210 mutex_lock(&uverbs_dev->lists_mutex);
1211 }
1212 mutex_unlock(&uverbs_dev->lists_mutex);
1213
1214 uverbs_disassociate_api(uverbs_dev->uapi);
1215}
1216
1217static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1218{
1219 struct ib_uverbs_device *uverbs_dev = client_data;
1220 int wait_clients = 1;
1221
1222 cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1223 ida_free(&uverbs_ida, uverbs_dev->devnum);
1224
1225 if (device->ops.disassociate_ucontext) {
1226 /* We disassociate HW resources and immediately return.
1227 * Userspace will see a EIO errno for all future access.
1228 * Upon returning, ib_device may be freed internally and is not
1229 * valid any more.
1230 * uverbs_device is still available until all clients close
1231 * their files, then the uverbs device ref count will be zero
1232 * and its resources will be freed.
1233 * Note: At this point no more files can be opened since the
1234 * cdev was deleted, however active clients can still issue
1235 * commands and close their open files.
1236 */
1237 ib_uverbs_free_hw_resources(uverbs_dev, device);
1238 wait_clients = 0;
1239 }
1240
1241 if (refcount_dec_and_test(&uverbs_dev->refcount))
1242 ib_uverbs_comp_dev(uverbs_dev);
1243 if (wait_clients)
1244 wait_for_completion(&uverbs_dev->comp);
1245
1246 put_device(&uverbs_dev->dev);
1247}
1248
1249static int __init ib_uverbs_init(void)
1250{
1251 int ret;
1252
1253 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1254 IB_UVERBS_NUM_FIXED_MINOR,
1255 "infiniband_verbs");
1256 if (ret) {
1257 pr_err("user_verbs: couldn't register device number\n");
1258 goto out;
1259 }
1260
1261 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1262 IB_UVERBS_NUM_DYNAMIC_MINOR,
1263 "infiniband_verbs");
1264 if (ret) {
1265 pr_err("couldn't register dynamic device number\n");
1266 goto out_alloc;
1267 }
1268
1269 ret = class_register(&uverbs_class);
1270 if (ret) {
1271 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1272 goto out_chrdev;
1273 }
1274
1275 ret = class_create_file(&uverbs_class, &class_attr_abi_version.attr);
1276 if (ret) {
1277 pr_err("user_verbs: couldn't create abi_version attribute\n");
1278 goto out_class;
1279 }
1280
1281 ret = ib_register_client(&uverbs_client);
1282 if (ret) {
1283 pr_err("user_verbs: couldn't register client\n");
1284 goto out_class;
1285 }
1286
1287 return 0;
1288
1289out_class:
1290 class_unregister(&uverbs_class);
1291
1292out_chrdev:
1293 unregister_chrdev_region(dynamic_uverbs_dev,
1294 IB_UVERBS_NUM_DYNAMIC_MINOR);
1295
1296out_alloc:
1297 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1298 IB_UVERBS_NUM_FIXED_MINOR);
1299
1300out:
1301 return ret;
1302}
1303
1304static void __exit ib_uverbs_cleanup(void)
1305{
1306 ib_unregister_client(&uverbs_client);
1307 class_unregister(&uverbs_class);
1308 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1309 IB_UVERBS_NUM_FIXED_MINOR);
1310 unregister_chrdev_region(dynamic_uverbs_dev,
1311 IB_UVERBS_NUM_DYNAMIC_MINOR);
1312 mmu_notifier_synchronize();
1313}
1314
1315module_init(ib_uverbs_init);
1316module_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 "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);
75DEFINE_IDR(ib_uverbs_xrcd_idr);
76DEFINE_IDR(ib_uverbs_rule_idr);
77
78static DEFINE_SPINLOCK(map_lock);
79static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
80
81static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
82 const char __user *buf, int in_len,
83 int out_len) = {
84 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
85 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
86 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
87 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
88 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
89 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
90 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
91 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
92 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
93 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
94 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
95 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
96 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
97 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
98 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
99 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
100 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
101 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
102 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
103 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
104 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
105 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
106 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
107 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
108 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
109 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
110 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
111 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
112 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
113 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
114 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
115 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
116 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
117 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
118};
119
120static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
121 struct ib_udata *ucore,
122 struct ib_udata *uhw) = {
123 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
124 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow
125};
126
127static void ib_uverbs_add_one(struct ib_device *device);
128static void ib_uverbs_remove_one(struct ib_device *device);
129
130static void ib_uverbs_release_dev(struct kref *ref)
131{
132 struct ib_uverbs_device *dev =
133 container_of(ref, struct ib_uverbs_device, ref);
134
135 complete(&dev->comp);
136}
137
138static void ib_uverbs_release_event_file(struct kref *ref)
139{
140 struct ib_uverbs_event_file *file =
141 container_of(ref, struct ib_uverbs_event_file, ref);
142
143 kfree(file);
144}
145
146void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
147 struct ib_uverbs_event_file *ev_file,
148 struct ib_ucq_object *uobj)
149{
150 struct ib_uverbs_event *evt, *tmp;
151
152 if (ev_file) {
153 spin_lock_irq(&ev_file->lock);
154 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
155 list_del(&evt->list);
156 kfree(evt);
157 }
158 spin_unlock_irq(&ev_file->lock);
159
160 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
161 }
162
163 spin_lock_irq(&file->async_file->lock);
164 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
165 list_del(&evt->list);
166 kfree(evt);
167 }
168 spin_unlock_irq(&file->async_file->lock);
169}
170
171void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
172 struct ib_uevent_object *uobj)
173{
174 struct ib_uverbs_event *evt, *tmp;
175
176 spin_lock_irq(&file->async_file->lock);
177 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
178 list_del(&evt->list);
179 kfree(evt);
180 }
181 spin_unlock_irq(&file->async_file->lock);
182}
183
184static void ib_uverbs_detach_umcast(struct ib_qp *qp,
185 struct ib_uqp_object *uobj)
186{
187 struct ib_uverbs_mcast_entry *mcast, *tmp;
188
189 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
190 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
191 list_del(&mcast->list);
192 kfree(mcast);
193 }
194}
195
196static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
197 struct ib_ucontext *context)
198{
199 struct ib_uobject *uobj, *tmp;
200
201 if (!context)
202 return 0;
203
204 context->closing = 1;
205
206 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
207 struct ib_ah *ah = uobj->object;
208
209 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
210 ib_destroy_ah(ah);
211 kfree(uobj);
212 }
213
214 /* Remove MWs before QPs, in order to support type 2A MWs. */
215 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
216 struct ib_mw *mw = uobj->object;
217
218 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
219 ib_dealloc_mw(mw);
220 kfree(uobj);
221 }
222
223 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
224 struct ib_flow *flow_id = uobj->object;
225
226 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
227 ib_destroy_flow(flow_id);
228 kfree(uobj);
229 }
230
231 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
232 struct ib_qp *qp = uobj->object;
233 struct ib_uqp_object *uqp =
234 container_of(uobj, struct ib_uqp_object, uevent.uobject);
235
236 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
237 if (qp != qp->real_qp) {
238 ib_close_qp(qp);
239 } else {
240 ib_uverbs_detach_umcast(qp, uqp);
241 ib_destroy_qp(qp);
242 }
243 ib_uverbs_release_uevent(file, &uqp->uevent);
244 kfree(uqp);
245 }
246
247 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
248 struct ib_cq *cq = uobj->object;
249 struct ib_uverbs_event_file *ev_file = cq->cq_context;
250 struct ib_ucq_object *ucq =
251 container_of(uobj, struct ib_ucq_object, uobject);
252
253 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
254 ib_destroy_cq(cq);
255 ib_uverbs_release_ucq(file, ev_file, ucq);
256 kfree(ucq);
257 }
258
259 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
260 struct ib_srq *srq = uobj->object;
261 struct ib_uevent_object *uevent =
262 container_of(uobj, struct ib_uevent_object, uobject);
263
264 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
265 ib_destroy_srq(srq);
266 ib_uverbs_release_uevent(file, uevent);
267 kfree(uevent);
268 }
269
270 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
271 struct ib_mr *mr = uobj->object;
272
273 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
274 ib_dereg_mr(mr);
275 kfree(uobj);
276 }
277
278 mutex_lock(&file->device->xrcd_tree_mutex);
279 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
280 struct ib_xrcd *xrcd = uobj->object;
281 struct ib_uxrcd_object *uxrcd =
282 container_of(uobj, struct ib_uxrcd_object, uobject);
283
284 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
285 ib_uverbs_dealloc_xrcd(file->device, xrcd);
286 kfree(uxrcd);
287 }
288 mutex_unlock(&file->device->xrcd_tree_mutex);
289
290 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
291 struct ib_pd *pd = uobj->object;
292
293 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
294 ib_dealloc_pd(pd);
295 kfree(uobj);
296 }
297
298 return context->device->dealloc_ucontext(context);
299}
300
301static void ib_uverbs_release_file(struct kref *ref)
302{
303 struct ib_uverbs_file *file =
304 container_of(ref, struct ib_uverbs_file, ref);
305
306 module_put(file->device->ib_dev->owner);
307 kref_put(&file->device->ref, ib_uverbs_release_dev);
308
309 kfree(file);
310}
311
312static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
313 size_t count, loff_t *pos)
314{
315 struct ib_uverbs_event_file *file = filp->private_data;
316 struct ib_uverbs_event *event;
317 int eventsz;
318 int ret = 0;
319
320 spin_lock_irq(&file->lock);
321
322 while (list_empty(&file->event_list)) {
323 spin_unlock_irq(&file->lock);
324
325 if (filp->f_flags & O_NONBLOCK)
326 return -EAGAIN;
327
328 if (wait_event_interruptible(file->poll_wait,
329 !list_empty(&file->event_list)))
330 return -ERESTARTSYS;
331
332 spin_lock_irq(&file->lock);
333 }
334
335 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
336
337 if (file->is_async)
338 eventsz = sizeof (struct ib_uverbs_async_event_desc);
339 else
340 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
341
342 if (eventsz > count) {
343 ret = -EINVAL;
344 event = NULL;
345 } else {
346 list_del(file->event_list.next);
347 if (event->counter) {
348 ++(*event->counter);
349 list_del(&event->obj_list);
350 }
351 }
352
353 spin_unlock_irq(&file->lock);
354
355 if (event) {
356 if (copy_to_user(buf, event, eventsz))
357 ret = -EFAULT;
358 else
359 ret = eventsz;
360 }
361
362 kfree(event);
363
364 return ret;
365}
366
367static unsigned int ib_uverbs_event_poll(struct file *filp,
368 struct poll_table_struct *wait)
369{
370 unsigned int pollflags = 0;
371 struct ib_uverbs_event_file *file = filp->private_data;
372
373 poll_wait(filp, &file->poll_wait, wait);
374
375 spin_lock_irq(&file->lock);
376 if (!list_empty(&file->event_list))
377 pollflags = POLLIN | POLLRDNORM;
378 spin_unlock_irq(&file->lock);
379
380 return pollflags;
381}
382
383static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
384{
385 struct ib_uverbs_event_file *file = filp->private_data;
386
387 return fasync_helper(fd, filp, on, &file->async_queue);
388}
389
390static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
391{
392 struct ib_uverbs_event_file *file = filp->private_data;
393 struct ib_uverbs_event *entry, *tmp;
394
395 spin_lock_irq(&file->lock);
396 file->is_closed = 1;
397 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
398 if (entry->counter)
399 list_del(&entry->obj_list);
400 kfree(entry);
401 }
402 spin_unlock_irq(&file->lock);
403
404 if (file->is_async) {
405 ib_unregister_event_handler(&file->uverbs_file->event_handler);
406 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
407 }
408 kref_put(&file->ref, ib_uverbs_release_event_file);
409
410 return 0;
411}
412
413static const struct file_operations uverbs_event_fops = {
414 .owner = THIS_MODULE,
415 .read = ib_uverbs_event_read,
416 .poll = ib_uverbs_event_poll,
417 .release = ib_uverbs_event_close,
418 .fasync = ib_uverbs_event_fasync,
419 .llseek = no_llseek,
420};
421
422void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
423{
424 struct ib_uverbs_event_file *file = cq_context;
425 struct ib_ucq_object *uobj;
426 struct ib_uverbs_event *entry;
427 unsigned long flags;
428
429 if (!file)
430 return;
431
432 spin_lock_irqsave(&file->lock, flags);
433 if (file->is_closed) {
434 spin_unlock_irqrestore(&file->lock, flags);
435 return;
436 }
437
438 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
439 if (!entry) {
440 spin_unlock_irqrestore(&file->lock, flags);
441 return;
442 }
443
444 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
445
446 entry->desc.comp.cq_handle = cq->uobject->user_handle;
447 entry->counter = &uobj->comp_events_reported;
448
449 list_add_tail(&entry->list, &file->event_list);
450 list_add_tail(&entry->obj_list, &uobj->comp_list);
451 spin_unlock_irqrestore(&file->lock, flags);
452
453 wake_up_interruptible(&file->poll_wait);
454 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
455}
456
457static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
458 __u64 element, __u64 event,
459 struct list_head *obj_list,
460 u32 *counter)
461{
462 struct ib_uverbs_event *entry;
463 unsigned long flags;
464
465 spin_lock_irqsave(&file->async_file->lock, flags);
466 if (file->async_file->is_closed) {
467 spin_unlock_irqrestore(&file->async_file->lock, flags);
468 return;
469 }
470
471 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
472 if (!entry) {
473 spin_unlock_irqrestore(&file->async_file->lock, flags);
474 return;
475 }
476
477 entry->desc.async.element = element;
478 entry->desc.async.event_type = event;
479 entry->counter = counter;
480
481 list_add_tail(&entry->list, &file->async_file->event_list);
482 if (obj_list)
483 list_add_tail(&entry->obj_list, obj_list);
484 spin_unlock_irqrestore(&file->async_file->lock, flags);
485
486 wake_up_interruptible(&file->async_file->poll_wait);
487 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
488}
489
490void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
491{
492 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
493 struct ib_ucq_object, uobject);
494
495 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
496 event->event, &uobj->async_list,
497 &uobj->async_events_reported);
498}
499
500void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
501{
502 struct ib_uevent_object *uobj;
503
504 uobj = container_of(event->element.qp->uobject,
505 struct ib_uevent_object, uobject);
506
507 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
508 event->event, &uobj->event_list,
509 &uobj->events_reported);
510}
511
512void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
513{
514 struct ib_uevent_object *uobj;
515
516 uobj = container_of(event->element.srq->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_event_handler(struct ib_event_handler *handler,
525 struct ib_event *event)
526{
527 struct ib_uverbs_file *file =
528 container_of(handler, struct ib_uverbs_file, event_handler);
529
530 ib_uverbs_async_handler(file, event->element.port_num, event->event,
531 NULL, NULL);
532}
533
534struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
535 int is_async)
536{
537 struct ib_uverbs_event_file *ev_file;
538 struct file *filp;
539
540 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
541 if (!ev_file)
542 return ERR_PTR(-ENOMEM);
543
544 kref_init(&ev_file->ref);
545 spin_lock_init(&ev_file->lock);
546 INIT_LIST_HEAD(&ev_file->event_list);
547 init_waitqueue_head(&ev_file->poll_wait);
548 ev_file->uverbs_file = uverbs_file;
549 ev_file->async_queue = NULL;
550 ev_file->is_async = is_async;
551 ev_file->is_closed = 0;
552
553 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
554 ev_file, O_RDONLY);
555 if (IS_ERR(filp))
556 kfree(ev_file);
557
558 return filp;
559}
560
561/*
562 * Look up a completion event file by FD. If lookup is successful,
563 * takes a ref to the event file struct that it returns; if
564 * unsuccessful, returns NULL.
565 */
566struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
567{
568 struct ib_uverbs_event_file *ev_file = NULL;
569 struct fd f = fdget(fd);
570
571 if (!f.file)
572 return NULL;
573
574 if (f.file->f_op != &uverbs_event_fops)
575 goto out;
576
577 ev_file = f.file->private_data;
578 if (ev_file->is_async) {
579 ev_file = NULL;
580 goto out;
581 }
582
583 kref_get(&ev_file->ref);
584
585out:
586 fdput(f);
587 return ev_file;
588}
589
590static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
591 size_t count, loff_t *pos)
592{
593 struct ib_uverbs_file *file = filp->private_data;
594 struct ib_uverbs_cmd_hdr hdr;
595 __u32 flags;
596
597 if (count < sizeof hdr)
598 return -EINVAL;
599
600 if (copy_from_user(&hdr, buf, sizeof hdr))
601 return -EFAULT;
602
603 flags = (hdr.command &
604 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
605
606 if (!flags) {
607 __u32 command;
608
609 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
610 IB_USER_VERBS_CMD_COMMAND_MASK))
611 return -EINVAL;
612
613 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
614
615 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
616 !uverbs_cmd_table[command])
617 return -EINVAL;
618
619 if (!file->ucontext &&
620 command != IB_USER_VERBS_CMD_GET_CONTEXT)
621 return -EINVAL;
622
623 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
624 return -ENOSYS;
625
626 if (hdr.in_words * 4 != count)
627 return -EINVAL;
628
629 return uverbs_cmd_table[command](file,
630 buf + sizeof(hdr),
631 hdr.in_words * 4,
632 hdr.out_words * 4);
633
634 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
635 __u32 command;
636
637 struct ib_uverbs_ex_cmd_hdr ex_hdr;
638 struct ib_udata ucore;
639 struct ib_udata uhw;
640 int err;
641 size_t written_count = count;
642
643 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
644 IB_USER_VERBS_CMD_COMMAND_MASK))
645 return -EINVAL;
646
647 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
648
649 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
650 !uverbs_ex_cmd_table[command])
651 return -ENOSYS;
652
653 if (!file->ucontext)
654 return -EINVAL;
655
656 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
657 return -ENOSYS;
658
659 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
660 return -EINVAL;
661
662 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
663 return -EFAULT;
664
665 count -= sizeof(hdr) + sizeof(ex_hdr);
666 buf += sizeof(hdr) + sizeof(ex_hdr);
667
668 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
669 return -EINVAL;
670
671 if (ex_hdr.cmd_hdr_reserved)
672 return -EINVAL;
673
674 if (ex_hdr.response) {
675 if (!hdr.out_words && !ex_hdr.provider_out_words)
676 return -EINVAL;
677
678 if (!access_ok(VERIFY_WRITE,
679 (void __user *) (unsigned long) ex_hdr.response,
680 (hdr.out_words + ex_hdr.provider_out_words) * 8))
681 return -EFAULT;
682 } else {
683 if (hdr.out_words || ex_hdr.provider_out_words)
684 return -EINVAL;
685 }
686
687 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
688 hdr.in_words * 8, hdr.out_words * 8);
689
690 INIT_UDATA_BUF_OR_NULL(&uhw,
691 buf + ucore.inlen,
692 (unsigned long) ex_hdr.response + ucore.outlen,
693 ex_hdr.provider_in_words * 8,
694 ex_hdr.provider_out_words * 8);
695
696 err = uverbs_ex_cmd_table[command](file,
697 &ucore,
698 &uhw);
699
700 if (err)
701 return err;
702
703 return written_count;
704 }
705
706 return -ENOSYS;
707}
708
709static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
710{
711 struct ib_uverbs_file *file = filp->private_data;
712
713 if (!file->ucontext)
714 return -ENODEV;
715 else
716 return file->device->ib_dev->mmap(file->ucontext, vma);
717}
718
719/*
720 * ib_uverbs_open() does not need the BKL:
721 *
722 * - the ib_uverbs_device structures are properly reference counted and
723 * everything else is purely local to the file being created, so
724 * races against other open calls are not a problem;
725 * - there is no ioctl method to race against;
726 * - the open method will either immediately run -ENXIO, or all
727 * required initialization will be done.
728 */
729static int ib_uverbs_open(struct inode *inode, struct file *filp)
730{
731 struct ib_uverbs_device *dev;
732 struct ib_uverbs_file *file;
733 int ret;
734
735 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
736 if (dev)
737 kref_get(&dev->ref);
738 else
739 return -ENXIO;
740
741 if (!try_module_get(dev->ib_dev->owner)) {
742 ret = -ENODEV;
743 goto err;
744 }
745
746 file = kmalloc(sizeof *file, GFP_KERNEL);
747 if (!file) {
748 ret = -ENOMEM;
749 goto err_module;
750 }
751
752 file->device = dev;
753 file->ucontext = NULL;
754 file->async_file = NULL;
755 kref_init(&file->ref);
756 mutex_init(&file->mutex);
757
758 filp->private_data = file;
759
760 return nonseekable_open(inode, filp);
761
762err_module:
763 module_put(dev->ib_dev->owner);
764
765err:
766 kref_put(&dev->ref, ib_uverbs_release_dev);
767 return ret;
768}
769
770static int ib_uverbs_close(struct inode *inode, struct file *filp)
771{
772 struct ib_uverbs_file *file = filp->private_data;
773
774 ib_uverbs_cleanup_ucontext(file, file->ucontext);
775
776 if (file->async_file)
777 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
778
779 kref_put(&file->ref, ib_uverbs_release_file);
780
781 return 0;
782}
783
784static const struct file_operations uverbs_fops = {
785 .owner = THIS_MODULE,
786 .write = ib_uverbs_write,
787 .open = ib_uverbs_open,
788 .release = ib_uverbs_close,
789 .llseek = no_llseek,
790};
791
792static const struct file_operations uverbs_mmap_fops = {
793 .owner = THIS_MODULE,
794 .write = ib_uverbs_write,
795 .mmap = ib_uverbs_mmap,
796 .open = ib_uverbs_open,
797 .release = ib_uverbs_close,
798 .llseek = no_llseek,
799};
800
801static struct ib_client uverbs_client = {
802 .name = "uverbs",
803 .add = ib_uverbs_add_one,
804 .remove = ib_uverbs_remove_one
805};
806
807static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
808 char *buf)
809{
810 struct ib_uverbs_device *dev = dev_get_drvdata(device);
811
812 if (!dev)
813 return -ENODEV;
814
815 return sprintf(buf, "%s\n", dev->ib_dev->name);
816}
817static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
818
819static ssize_t show_dev_abi_version(struct device *device,
820 struct device_attribute *attr, char *buf)
821{
822 struct ib_uverbs_device *dev = dev_get_drvdata(device);
823
824 if (!dev)
825 return -ENODEV;
826
827 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
828}
829static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
830
831static CLASS_ATTR_STRING(abi_version, S_IRUGO,
832 __stringify(IB_USER_VERBS_ABI_VERSION));
833
834static dev_t overflow_maj;
835static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
836
837/*
838 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
839 * requesting a new major number and doubling the number of max devices we
840 * support. It's stupid, but simple.
841 */
842static int find_overflow_devnum(void)
843{
844 int ret;
845
846 if (!overflow_maj) {
847 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
848 "infiniband_verbs");
849 if (ret) {
850 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
851 return ret;
852 }
853 }
854
855 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
856 if (ret >= IB_UVERBS_MAX_DEVICES)
857 return -1;
858
859 return ret;
860}
861
862static void ib_uverbs_add_one(struct ib_device *device)
863{
864 int devnum;
865 dev_t base;
866 struct ib_uverbs_device *uverbs_dev;
867
868 if (!device->alloc_ucontext)
869 return;
870
871 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
872 if (!uverbs_dev)
873 return;
874
875 kref_init(&uverbs_dev->ref);
876 init_completion(&uverbs_dev->comp);
877 uverbs_dev->xrcd_tree = RB_ROOT;
878 mutex_init(&uverbs_dev->xrcd_tree_mutex);
879
880 spin_lock(&map_lock);
881 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
882 if (devnum >= IB_UVERBS_MAX_DEVICES) {
883 spin_unlock(&map_lock);
884 devnum = find_overflow_devnum();
885 if (devnum < 0)
886 goto err;
887
888 spin_lock(&map_lock);
889 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
890 base = devnum + overflow_maj;
891 set_bit(devnum, overflow_map);
892 } else {
893 uverbs_dev->devnum = devnum;
894 base = devnum + IB_UVERBS_BASE_DEV;
895 set_bit(devnum, dev_map);
896 }
897 spin_unlock(&map_lock);
898
899 uverbs_dev->ib_dev = device;
900 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
901
902 cdev_init(&uverbs_dev->cdev, NULL);
903 uverbs_dev->cdev.owner = THIS_MODULE;
904 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
905 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
906 if (cdev_add(&uverbs_dev->cdev, base, 1))
907 goto err_cdev;
908
909 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
910 uverbs_dev->cdev.dev, uverbs_dev,
911 "uverbs%d", uverbs_dev->devnum);
912 if (IS_ERR(uverbs_dev->dev))
913 goto err_cdev;
914
915 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
916 goto err_class;
917 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
918 goto err_class;
919
920 ib_set_client_data(device, &uverbs_client, uverbs_dev);
921
922 return;
923
924err_class:
925 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
926
927err_cdev:
928 cdev_del(&uverbs_dev->cdev);
929 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
930 clear_bit(devnum, dev_map);
931 else
932 clear_bit(devnum, overflow_map);
933
934err:
935 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
936 wait_for_completion(&uverbs_dev->comp);
937 kfree(uverbs_dev);
938 return;
939}
940
941static void ib_uverbs_remove_one(struct ib_device *device)
942{
943 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
944
945 if (!uverbs_dev)
946 return;
947
948 dev_set_drvdata(uverbs_dev->dev, NULL);
949 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
950 cdev_del(&uverbs_dev->cdev);
951
952 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
953 clear_bit(uverbs_dev->devnum, dev_map);
954 else
955 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
956
957 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
958 wait_for_completion(&uverbs_dev->comp);
959 kfree(uverbs_dev);
960}
961
962static char *uverbs_devnode(struct device *dev, umode_t *mode)
963{
964 if (mode)
965 *mode = 0666;
966 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
967}
968
969static int __init ib_uverbs_init(void)
970{
971 int ret;
972
973 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
974 "infiniband_verbs");
975 if (ret) {
976 printk(KERN_ERR "user_verbs: couldn't register device number\n");
977 goto out;
978 }
979
980 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
981 if (IS_ERR(uverbs_class)) {
982 ret = PTR_ERR(uverbs_class);
983 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
984 goto out_chrdev;
985 }
986
987 uverbs_class->devnode = uverbs_devnode;
988
989 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
990 if (ret) {
991 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
992 goto out_class;
993 }
994
995 ret = ib_register_client(&uverbs_client);
996 if (ret) {
997 printk(KERN_ERR "user_verbs: couldn't register client\n");
998 goto out_class;
999 }
1000
1001 return 0;
1002
1003out_class:
1004 class_destroy(uverbs_class);
1005
1006out_chrdev:
1007 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1008
1009out:
1010 return ret;
1011}
1012
1013static void __exit ib_uverbs_cleanup(void)
1014{
1015 ib_unregister_client(&uverbs_client);
1016 class_destroy(uverbs_class);
1017 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1018 if (overflow_maj)
1019 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1020 idr_destroy(&ib_uverbs_pd_idr);
1021 idr_destroy(&ib_uverbs_mr_idr);
1022 idr_destroy(&ib_uverbs_mw_idr);
1023 idr_destroy(&ib_uverbs_ah_idr);
1024 idr_destroy(&ib_uverbs_cq_idr);
1025 idr_destroy(&ib_uverbs_qp_idr);
1026 idr_destroy(&ib_uverbs_srq_idr);
1027}
1028
1029module_init(ib_uverbs_init);
1030module_exit(ib_uverbs_cleanup);