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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jmorris...
[linux/fpc-iii.git] / drivers / infiniband / core / uverbs_main.c
blob08219fb3338b0652f350da1af864b4cfb355ff3c
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
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55 MODULE_LICENSE("Dual BSD/GPL");
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 DEFINE_IDR(ib_uverbs_xrcd_idr);
76 DEFINE_IDR(ib_uverbs_rule_idr);
77
78 static DEFINE_SPINLOCK(map_lock);
79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
80
81 static 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
120 static 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
127 static void ib_uverbs_add_one(struct ib_device *device);
128 static void ib_uverbs_remove_one(struct ib_device *device);
129
130 static 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
138 static 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
146 void 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
171 void 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
184 static 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
196 static 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
301 static 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
312 static 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
367 static 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
383 static 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
390 static 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
413 static 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
422 void 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
457 static 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
490 void 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
500 void 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
512 void 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
524 void 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
534 struct 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 */
566 struct 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
585 out:
586 fdput(f);
587 return ev_file;
588 }
589
590 static 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
709 static 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 */
729 static 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
762 err_module:
763 module_put(dev->ib_dev->owner);
764
765 err:
766 kref_put(&dev->ref, ib_uverbs_release_dev);
767 return ret;
768 }
769
770 static 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
784 static 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
792 static 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
801 static struct ib_client uverbs_client = {
802 .name = "uverbs",
803 .add = ib_uverbs_add_one,
804 .remove = ib_uverbs_remove_one
805 };
806
807 static 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 }
817 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
818
819 static 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 }
829 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
830
831 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
832 __stringify(IB_USER_VERBS_ABI_VERSION));
833
834 static dev_t overflow_maj;
835 static 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 */
842 static 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
862 static 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
924 err_class:
925 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
926
927 err_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
934 err:
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
941 static 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
962 static 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
969 static 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
1003 out_class:
1004 class_destroy(uverbs_class);
1005
1006 out_chrdev:
1007 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1008
1009 out:
1010 return ret;
1011 }
1012
1013 static 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
1029 module_init(ib_uverbs_init);
1030 module_exit(ib_uverbs_cleanup);
Linux with added FPC-III support