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/file.h>
44 #include <linux/mount.h>
45 #include <linux/cdev.h>
46
47 #include <asm/uaccess.h>
48
49 #include "uverbs.h"
50
51 MODULE_AUTHOR("Roland Dreier");
52 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
53 MODULE_LICENSE("Dual BSD/GPL");
54
55 #define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */
56
57 enum {
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
65 static struct class *uverbs_class;
66
67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
68 DEFINE_IDR(ib_uverbs_pd_idr);
69 DEFINE_IDR(ib_uverbs_mr_idr);
70 DEFINE_IDR(ib_uverbs_mw_idr);
71 DEFINE_IDR(ib_uverbs_ah_idr);
72 DEFINE_IDR(ib_uverbs_cq_idr);
73 DEFINE_IDR(ib_uverbs_qp_idr);
74 DEFINE_IDR(ib_uverbs_srq_idr);
75
76 static spinlock_t map_lock;
77 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
78 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
79
80 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
81 const char __user *buf, int in_len,
82 int out_len) = {
83 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
84 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
85 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
86 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
87 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
88 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
89 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
90 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
91 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
92 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
93 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
94 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
95 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
96 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
97 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
98 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
99 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
100 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
101 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
102 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
103 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
104 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
105 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
106 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
107 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
108 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
109 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
110 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
111 };
112
113 static struct vfsmount *uverbs_event_mnt;
114
115 static void ib_uverbs_add_one(struct ib_device *device);
116 static void ib_uverbs_remove_one(struct ib_device *device);
117
ib_uverbs_release_dev(struct kref * ref)118 static void ib_uverbs_release_dev(struct kref *ref)
119 {
120 struct ib_uverbs_device *dev =
121 container_of(ref, struct ib_uverbs_device, ref);
122
123 complete(&dev->comp);
124 }
125
ib_uverbs_release_event_file(struct kref * ref)126 static void ib_uverbs_release_event_file(struct kref *ref)
127 {
128 struct ib_uverbs_event_file *file =
129 container_of(ref, struct ib_uverbs_event_file, ref);
130
131 kfree(file);
132 }
133
ib_uverbs_release_ucq(struct ib_uverbs_file * file,struct ib_uverbs_event_file * ev_file,struct ib_ucq_object * uobj)134 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
135 struct ib_uverbs_event_file *ev_file,
136 struct ib_ucq_object *uobj)
137 {
138 struct ib_uverbs_event *evt, *tmp;
139
140 if (ev_file) {
141 spin_lock_irq(&ev_file->lock);
142 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
143 list_del(&evt->list);
144 kfree(evt);
145 }
146 spin_unlock_irq(&ev_file->lock);
147
148 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
149 }
150
151 spin_lock_irq(&file->async_file->lock);
152 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
153 list_del(&evt->list);
154 kfree(evt);
155 }
156 spin_unlock_irq(&file->async_file->lock);
157 }
158
ib_uverbs_release_uevent(struct ib_uverbs_file * file,struct ib_uevent_object * uobj)159 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
160 struct ib_uevent_object *uobj)
161 {
162 struct ib_uverbs_event *evt, *tmp;
163
164 spin_lock_irq(&file->async_file->lock);
165 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
166 list_del(&evt->list);
167 kfree(evt);
168 }
169 spin_unlock_irq(&file->async_file->lock);
170 }
171
ib_uverbs_detach_umcast(struct ib_qp * qp,struct ib_uqp_object * uobj)172 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
173 struct ib_uqp_object *uobj)
174 {
175 struct ib_uverbs_mcast_entry *mcast, *tmp;
176
177 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
178 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
179 list_del(&mcast->list);
180 kfree(mcast);
181 }
182 }
183
ib_uverbs_cleanup_ucontext(struct ib_uverbs_file * file,struct ib_ucontext * context)184 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
185 struct ib_ucontext *context)
186 {
187 struct ib_uobject *uobj, *tmp;
188
189 if (!context)
190 return 0;
191
192 context->closing = 1;
193
194 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
195 struct ib_ah *ah = uobj->object;
196
197 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
198 ib_destroy_ah(ah);
199 kfree(uobj);
200 }
201
202 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
203 struct ib_qp *qp = uobj->object;
204 struct ib_uqp_object *uqp =
205 container_of(uobj, struct ib_uqp_object, uevent.uobject);
206
207 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
208 ib_uverbs_detach_umcast(qp, uqp);
209 ib_destroy_qp(qp);
210 ib_uverbs_release_uevent(file, &uqp->uevent);
211 kfree(uqp);
212 }
213
214 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
215 struct ib_cq *cq = uobj->object;
216 struct ib_uverbs_event_file *ev_file = cq->cq_context;
217 struct ib_ucq_object *ucq =
218 container_of(uobj, struct ib_ucq_object, uobject);
219
220 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
221 ib_destroy_cq(cq);
222 ib_uverbs_release_ucq(file, ev_file, ucq);
223 kfree(ucq);
224 }
225
226 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
227 struct ib_srq *srq = uobj->object;
228 struct ib_uevent_object *uevent =
229 container_of(uobj, struct ib_uevent_object, uobject);
230
231 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
232 ib_destroy_srq(srq);
233 ib_uverbs_release_uevent(file, uevent);
234 kfree(uevent);
235 }
236
237 /* XXX Free MWs */
238
239 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
240 struct ib_mr *mr = uobj->object;
241
242 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
243 ib_dereg_mr(mr);
244 kfree(uobj);
245 }
246
247 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
248 struct ib_pd *pd = uobj->object;
249
250 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
251 ib_dealloc_pd(pd);
252 kfree(uobj);
253 }
254
255 return context->device->dealloc_ucontext(context);
256 }
257
ib_uverbs_release_file(struct kref * ref)258 static void ib_uverbs_release_file(struct kref *ref)
259 {
260 struct ib_uverbs_file *file =
261 container_of(ref, struct ib_uverbs_file, ref);
262
263 module_put(file->device->ib_dev->owner);
264 kref_put(&file->device->ref, ib_uverbs_release_dev);
265
266 kfree(file);
267 }
268
ib_uverbs_event_read(struct file * filp,char __user * buf,size_t count,loff_t * pos)269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
270 size_t count, loff_t *pos)
271 {
272 struct ib_uverbs_event_file *file = filp->private_data;
273 struct ib_uverbs_event *event;
274 int eventsz;
275 int ret = 0;
276
277 spin_lock_irq(&file->lock);
278
279 while (list_empty(&file->event_list)) {
280 spin_unlock_irq(&file->lock);
281
282 if (filp->f_flags & O_NONBLOCK)
283 return -EAGAIN;
284
285 if (wait_event_interruptible(file->poll_wait,
286 !list_empty(&file->event_list)))
287 return -ERESTARTSYS;
288
289 spin_lock_irq(&file->lock);
290 }
291
292 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
293
294 if (file->is_async)
295 eventsz = sizeof (struct ib_uverbs_async_event_desc);
296 else
297 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
298
299 if (eventsz > count) {
300 ret = -EINVAL;
301 event = NULL;
302 } else {
303 list_del(file->event_list.next);
304 if (event->counter) {
305 ++(*event->counter);
306 list_del(&event->obj_list);
307 }
308 }
309
310 spin_unlock_irq(&file->lock);
311
312 if (event) {
313 if (copy_to_user(buf, event, eventsz))
314 ret = -EFAULT;
315 else
316 ret = eventsz;
317 }
318
319 kfree(event);
320
321 return ret;
322 }
323
ib_uverbs_event_poll(struct file * filp,struct poll_table_struct * wait)324 static unsigned int ib_uverbs_event_poll(struct file *filp,
325 struct poll_table_struct *wait)
326 {
327 unsigned int pollflags = 0;
328 struct ib_uverbs_event_file *file = filp->private_data;
329
330 poll_wait(filp, &file->poll_wait, wait);
331
332 spin_lock_irq(&file->lock);
333 if (!list_empty(&file->event_list))
334 pollflags = POLLIN | POLLRDNORM;
335 spin_unlock_irq(&file->lock);
336
337 return pollflags;
338 }
339
ib_uverbs_event_fasync(int fd,struct file * filp,int on)340 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
341 {
342 struct ib_uverbs_event_file *file = filp->private_data;
343
344 return fasync_helper(fd, filp, on, &file->async_queue);
345 }
346
ib_uverbs_event_close(struct inode * inode,struct file * filp)347 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
348 {
349 struct ib_uverbs_event_file *file = filp->private_data;
350 struct ib_uverbs_event *entry, *tmp;
351
352 spin_lock_irq(&file->lock);
353 file->is_closed = 1;
354 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
355 if (entry->counter)
356 list_del(&entry->obj_list);
357 kfree(entry);
358 }
359 spin_unlock_irq(&file->lock);
360
361 if (file->is_async) {
362 ib_unregister_event_handler(&file->uverbs_file->event_handler);
363 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
364 }
365 kref_put(&file->ref, ib_uverbs_release_event_file);
366
367 return 0;
368 }
369
370 static const struct file_operations uverbs_event_fops = {
371 .owner = THIS_MODULE,
372 .read = ib_uverbs_event_read,
373 .poll = ib_uverbs_event_poll,
374 .release = ib_uverbs_event_close,
375 .fasync = ib_uverbs_event_fasync
376 };
377
ib_uverbs_comp_handler(struct ib_cq * cq,void * cq_context)378 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
379 {
380 struct ib_uverbs_event_file *file = cq_context;
381 struct ib_ucq_object *uobj;
382 struct ib_uverbs_event *entry;
383 unsigned long flags;
384
385 if (!file)
386 return;
387
388 spin_lock_irqsave(&file->lock, flags);
389 if (file->is_closed) {
390 spin_unlock_irqrestore(&file->lock, flags);
391 return;
392 }
393
394 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
395 if (!entry) {
396 spin_unlock_irqrestore(&file->lock, flags);
397 return;
398 }
399
400 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
401
402 entry->desc.comp.cq_handle = cq->uobject->user_handle;
403 entry->counter = &uobj->comp_events_reported;
404
405 list_add_tail(&entry->list, &file->event_list);
406 list_add_tail(&entry->obj_list, &uobj->comp_list);
407 spin_unlock_irqrestore(&file->lock, flags);
408
409 wake_up_interruptible(&file->poll_wait);
410 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
411 }
412
ib_uverbs_async_handler(struct ib_uverbs_file * file,__u64 element,__u64 event,struct list_head * obj_list,u32 * counter)413 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
414 __u64 element, __u64 event,
415 struct list_head *obj_list,
416 u32 *counter)
417 {
418 struct ib_uverbs_event *entry;
419 unsigned long flags;
420
421 spin_lock_irqsave(&file->async_file->lock, flags);
422 if (file->async_file->is_closed) {
423 spin_unlock_irqrestore(&file->async_file->lock, flags);
424 return;
425 }
426
427 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
428 if (!entry) {
429 spin_unlock_irqrestore(&file->async_file->lock, flags);
430 return;
431 }
432
433 entry->desc.async.element = element;
434 entry->desc.async.event_type = event;
435 entry->counter = counter;
436
437 list_add_tail(&entry->list, &file->async_file->event_list);
438 if (obj_list)
439 list_add_tail(&entry->obj_list, obj_list);
440 spin_unlock_irqrestore(&file->async_file->lock, flags);
441
442 wake_up_interruptible(&file->async_file->poll_wait);
443 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
444 }
445
ib_uverbs_cq_event_handler(struct ib_event * event,void * context_ptr)446 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
447 {
448 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
449 struct ib_ucq_object, uobject);
450
451 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
452 event->event, &uobj->async_list,
453 &uobj->async_events_reported);
454 }
455
ib_uverbs_qp_event_handler(struct ib_event * event,void * context_ptr)456 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
457 {
458 struct ib_uevent_object *uobj;
459
460 uobj = container_of(event->element.qp->uobject,
461 struct ib_uevent_object, uobject);
462
463 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
464 event->event, &uobj->event_list,
465 &uobj->events_reported);
466 }
467
ib_uverbs_srq_event_handler(struct ib_event * event,void * context_ptr)468 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
469 {
470 struct ib_uevent_object *uobj;
471
472 uobj = container_of(event->element.srq->uobject,
473 struct ib_uevent_object, uobject);
474
475 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
476 event->event, &uobj->event_list,
477 &uobj->events_reported);
478 }
479
ib_uverbs_event_handler(struct ib_event_handler * handler,struct ib_event * event)480 void ib_uverbs_event_handler(struct ib_event_handler *handler,
481 struct ib_event *event)
482 {
483 struct ib_uverbs_file *file =
484 container_of(handler, struct ib_uverbs_file, event_handler);
485
486 ib_uverbs_async_handler(file, event->element.port_num, event->event,
487 NULL, NULL);
488 }
489
ib_uverbs_alloc_event_file(struct ib_uverbs_file * uverbs_file,int is_async,int * fd)490 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
491 int is_async, int *fd)
492 {
493 struct ib_uverbs_event_file *ev_file;
494 struct file *filp;
495 int ret;
496
497 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
498 if (!ev_file)
499 return ERR_PTR(-ENOMEM);
500
501 kref_init(&ev_file->ref);
502 spin_lock_init(&ev_file->lock);
503 INIT_LIST_HEAD(&ev_file->event_list);
504 init_waitqueue_head(&ev_file->poll_wait);
505 ev_file->uverbs_file = uverbs_file;
506 ev_file->async_queue = NULL;
507 ev_file->is_async = is_async;
508 ev_file->is_closed = 0;
509
510 *fd = get_unused_fd();
511 if (*fd < 0) {
512 ret = *fd;
513 goto err;
514 }
515
516 /*
517 * fops_get() can't fail here, because we're coming from a
518 * system call on a uverbs file, which will already have a
519 * module reference.
520 */
521 filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root),
522 FMODE_READ, fops_get(&uverbs_event_fops));
523 if (!filp) {
524 ret = -ENFILE;
525 goto err_fd;
526 }
527
528 filp->private_data = ev_file;
529
530 return filp;
531
532 err_fd:
533 put_unused_fd(*fd);
534
535 err:
536 kfree(ev_file);
537 return ERR_PTR(ret);
538 }
539
540 /*
541 * Look up a completion event file by FD. If lookup is successful,
542 * takes a ref to the event file struct that it returns; if
543 * unsuccessful, returns NULL.
544 */
ib_uverbs_lookup_comp_file(int fd)545 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
546 {
547 struct ib_uverbs_event_file *ev_file = NULL;
548 struct file *filp;
549
550 filp = fget(fd);
551 if (!filp)
552 return NULL;
553
554 if (filp->f_op != &uverbs_event_fops)
555 goto out;
556
557 ev_file = filp->private_data;
558 if (ev_file->is_async) {
559 ev_file = NULL;
560 goto out;
561 }
562
563 kref_get(&ev_file->ref);
564
565 out:
566 fput(filp);
567 return ev_file;
568 }
569
ib_uverbs_write(struct file * filp,const char __user * buf,size_t count,loff_t * pos)570 static 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 struct ib_uverbs_cmd_hdr hdr;
575
576 if (count < sizeof hdr)
577 return -EINVAL;
578
579 if (copy_from_user(&hdr, buf, sizeof hdr))
580 return -EFAULT;
581
582 if (hdr.in_words * 4 != count)
583 return -EINVAL;
584
585 if (hdr.command < 0 ||
586 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
587 !uverbs_cmd_table[hdr.command] ||
588 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
589 return -EINVAL;
590
591 if (!file->ucontext &&
592 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
593 return -EINVAL;
594
595 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
596 hdr.in_words * 4, hdr.out_words * 4);
597 }
598
ib_uverbs_mmap(struct file * filp,struct vm_area_struct * vma)599 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
600 {
601 struct ib_uverbs_file *file = filp->private_data;
602
603 if (!file->ucontext)
604 return -ENODEV;
605 else
606 return file->device->ib_dev->mmap(file->ucontext, vma);
607 }
608
609 /*
610 * ib_uverbs_open() does not need the BKL:
611 *
612 * - dev_table[] accesses are protected by map_lock, the
613 * ib_uverbs_device structures are properly reference counted, and
614 * everything else is purely local to the file being created, so
615 * races against other open calls are not a problem;
616 * - there is no ioctl method to race against;
617 * - the device is added to dev_table[] as the last part of module
618 * initialization, the open method will either immediately run
619 * -ENXIO, or all required initialization will be done.
620 */
ib_uverbs_open(struct inode * inode,struct file * filp)621 static int ib_uverbs_open(struct inode *inode, struct file *filp)
622 {
623 struct ib_uverbs_device *dev;
624 struct ib_uverbs_file *file;
625 int ret;
626
627 spin_lock(&map_lock);
628 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
629 if (dev)
630 kref_get(&dev->ref);
631 spin_unlock(&map_lock);
632
633 if (!dev)
634 return -ENXIO;
635
636 if (!try_module_get(dev->ib_dev->owner)) {
637 ret = -ENODEV;
638 goto err;
639 }
640
641 file = kmalloc(sizeof *file, GFP_KERNEL);
642 if (!file) {
643 ret = -ENOMEM;
644 goto err_module;
645 }
646
647 file->device = dev;
648 file->ucontext = NULL;
649 file->async_file = NULL;
650 kref_init(&file->ref);
651 mutex_init(&file->mutex);
652
653 filp->private_data = file;
654
655 return 0;
656
657 err_module:
658 module_put(dev->ib_dev->owner);
659
660 err:
661 kref_put(&dev->ref, ib_uverbs_release_dev);
662 return ret;
663 }
664
ib_uverbs_close(struct inode * inode,struct file * filp)665 static int ib_uverbs_close(struct inode *inode, struct file *filp)
666 {
667 struct ib_uverbs_file *file = filp->private_data;
668
669 ib_uverbs_cleanup_ucontext(file, file->ucontext);
670
671 if (file->async_file)
672 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
673
674 kref_put(&file->ref, ib_uverbs_release_file);
675
676 return 0;
677 }
678
679 static const struct file_operations uverbs_fops = {
680 .owner = THIS_MODULE,
681 .write = ib_uverbs_write,
682 .open = ib_uverbs_open,
683 .release = ib_uverbs_close
684 };
685
686 static const struct file_operations uverbs_mmap_fops = {
687 .owner = THIS_MODULE,
688 .write = ib_uverbs_write,
689 .mmap = ib_uverbs_mmap,
690 .open = ib_uverbs_open,
691 .release = ib_uverbs_close
692 };
693
694 static struct ib_client uverbs_client = {
695 .name = "uverbs",
696 .add = ib_uverbs_add_one,
697 .remove = ib_uverbs_remove_one
698 };
699
show_ibdev(struct device * device,struct device_attribute * attr,char * buf)700 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
701 char *buf)
702 {
703 struct ib_uverbs_device *dev = dev_get_drvdata(device);
704
705 if (!dev)
706 return -ENODEV;
707
708 return sprintf(buf, "%s\n", dev->ib_dev->name);
709 }
710 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
711
show_dev_abi_version(struct device * device,struct device_attribute * attr,char * buf)712 static ssize_t show_dev_abi_version(struct device *device,
713 struct device_attribute *attr, char *buf)
714 {
715 struct ib_uverbs_device *dev = dev_get_drvdata(device);
716
717 if (!dev)
718 return -ENODEV;
719
720 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
721 }
722 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
723
show_abi_version(struct class * class,char * buf)724 static ssize_t show_abi_version(struct class *class, char *buf)
725 {
726 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
727 }
728 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
729
ib_uverbs_add_one(struct ib_device * device)730 static void ib_uverbs_add_one(struct ib_device *device)
731 {
732 struct ib_uverbs_device *uverbs_dev;
733
734 if (!device->alloc_ucontext)
735 return;
736
737 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
738 if (!uverbs_dev)
739 return;
740
741 kref_init(&uverbs_dev->ref);
742 init_completion(&uverbs_dev->comp);
743
744 spin_lock(&map_lock);
745 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
746 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
747 spin_unlock(&map_lock);
748 goto err;
749 }
750 set_bit(uverbs_dev->devnum, dev_map);
751 spin_unlock(&map_lock);
752
753 uverbs_dev->ib_dev = device;
754 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
755
756 uverbs_dev->cdev = cdev_alloc();
757 if (!uverbs_dev->cdev)
758 goto err;
759 uverbs_dev->cdev->owner = THIS_MODULE;
760 uverbs_dev->cdev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
761 kobject_set_name(&uverbs_dev->cdev->kobj, "uverbs%d", uverbs_dev->devnum);
762 if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
763 goto err_cdev;
764
765 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
766 uverbs_dev->cdev->dev, uverbs_dev,
767 "uverbs%d", uverbs_dev->devnum);
768 if (IS_ERR(uverbs_dev->dev))
769 goto err_cdev;
770
771 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
772 goto err_class;
773 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
774 goto err_class;
775
776 spin_lock(&map_lock);
777 dev_table[uverbs_dev->devnum] = uverbs_dev;
778 spin_unlock(&map_lock);
779
780 ib_set_client_data(device, &uverbs_client, uverbs_dev);
781
782 return;
783
784 err_class:
785 device_destroy(uverbs_class, uverbs_dev->cdev->dev);
786
787 err_cdev:
788 cdev_del(uverbs_dev->cdev);
789 clear_bit(uverbs_dev->devnum, dev_map);
790
791 err:
792 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
793 wait_for_completion(&uverbs_dev->comp);
794 kfree(uverbs_dev);
795 return;
796 }
797
ib_uverbs_remove_one(struct ib_device * device)798 static void ib_uverbs_remove_one(struct ib_device *device)
799 {
800 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
801
802 if (!uverbs_dev)
803 return;
804
805 dev_set_drvdata(uverbs_dev->dev, NULL);
806 device_destroy(uverbs_class, uverbs_dev->cdev->dev);
807 cdev_del(uverbs_dev->cdev);
808
809 spin_lock(&map_lock);
810 dev_table[uverbs_dev->devnum] = NULL;
811 spin_unlock(&map_lock);
812
813 clear_bit(uverbs_dev->devnum, dev_map);
814
815 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
816 wait_for_completion(&uverbs_dev->comp);
817 kfree(uverbs_dev);
818 }
819
uverbs_event_get_sb(struct file_system_type * fs_type,int flags,const char * dev_name,void * data,struct vfsmount * mnt)820 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
821 const char *dev_name, void *data,
822 struct vfsmount *mnt)
823 {
824 return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
825 INFINIBANDEVENTFS_MAGIC, mnt);
826 }
827
828 static struct file_system_type uverbs_event_fs = {
829 /* No owner field so module can be unloaded */
830 .name = "infinibandeventfs",
831 .get_sb = uverbs_event_get_sb,
832 .kill_sb = kill_litter_super
833 };
834
ib_uverbs_init(void)835 static int __init ib_uverbs_init(void)
836 {
837 int ret;
838
839 spin_lock_init(&map_lock);
840
841 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
842 "infiniband_verbs");
843 if (ret) {
844 printk(KERN_ERR "user_verbs: couldn't register device number\n");
845 goto out;
846 }
847
848 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
849 if (IS_ERR(uverbs_class)) {
850 ret = PTR_ERR(uverbs_class);
851 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
852 goto out_chrdev;
853 }
854
855 ret = class_create_file(uverbs_class, &class_attr_abi_version);
856 if (ret) {
857 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
858 goto out_class;
859 }
860
861 ret = register_filesystem(&uverbs_event_fs);
862 if (ret) {
863 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
864 goto out_class;
865 }
866
867 uverbs_event_mnt = kern_mount(&uverbs_event_fs);
868 if (IS_ERR(uverbs_event_mnt)) {
869 ret = PTR_ERR(uverbs_event_mnt);
870 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
871 goto out_fs;
872 }
873
874 ret = ib_register_client(&uverbs_client);
875 if (ret) {
876 printk(KERN_ERR "user_verbs: couldn't register client\n");
877 goto out_mnt;
878 }
879
880 return 0;
881
882 out_mnt:
883 mntput(uverbs_event_mnt);
884
885 out_fs:
886 unregister_filesystem(&uverbs_event_fs);
887
888 out_class:
889 class_destroy(uverbs_class);
890
891 out_chrdev:
892 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
893
894 out:
895 return ret;
896 }
897
ib_uverbs_cleanup(void)898 static void __exit ib_uverbs_cleanup(void)
899 {
900 ib_unregister_client(&uverbs_client);
901 mntput(uverbs_event_mnt);
902 unregister_filesystem(&uverbs_event_fs);
903 class_destroy(uverbs_class);
904 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
905 idr_destroy(&ib_uverbs_pd_idr);
906 idr_destroy(&ib_uverbs_mr_idr);
907 idr_destroy(&ib_uverbs_mw_idr);
908 idr_destroy(&ib_uverbs_ah_idr);
909 idr_destroy(&ib_uverbs_cq_idr);
910 idr_destroy(&ib_uverbs_qp_idr);
911 idr_destroy(&ib_uverbs_srq_idr);
912 }
913
914 module_init(ib_uverbs_init);
915 module_exit(ib_uverbs_cleanup);
916