Linux 4.1.16
[linux/fpc-iii.git] / drivers / infiniband / core / uverbs_main.c
blob09686d49d4c14849c367d6d0f0aba2f6f7f907c7
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.
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:
14 * Redistribution and use in source and binary forms, with or
15 * without modification, are permitted provided that the following
16 * conditions are met:
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
20 * disclaimer.
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.
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.
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>
49 #include <asm/uaccess.h>
51 #include "uverbs.h"
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55 MODULE_LICENSE("Dual BSD/GPL");
57 enum {
58 IB_UVERBS_MAJOR = 231,
59 IB_UVERBS_BASE_MINOR = 192,
60 IB_UVERBS_MAX_DEVICES = 32
63 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
65 static struct class *uverbs_class;
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);
78 static DEFINE_SPINLOCK(map_lock);
79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
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_REREG_MR] = ib_uverbs_rereg_mr,
91 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
92 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
93 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
94 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
95 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
96 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
97 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
98 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
99 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
100 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
101 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
102 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
103 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
104 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
105 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
106 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
107 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
108 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
109 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
110 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
111 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
112 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
113 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
114 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
115 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
116 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
117 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
118 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
121 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
122 struct ib_udata *ucore,
123 struct ib_udata *uhw) = {
124 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow,
125 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow,
126 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device,
129 static void ib_uverbs_add_one(struct ib_device *device);
130 static void ib_uverbs_remove_one(struct ib_device *device);
132 static void ib_uverbs_release_dev(struct kobject *kobj)
134 struct ib_uverbs_device *dev =
135 container_of(kobj, struct ib_uverbs_device, kobj);
137 kfree(dev);
140 static struct kobj_type ib_uverbs_dev_ktype = {
141 .release = ib_uverbs_release_dev,
144 static void ib_uverbs_release_event_file(struct kref *ref)
146 struct ib_uverbs_event_file *file =
147 container_of(ref, struct ib_uverbs_event_file, ref);
149 kfree(file);
152 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
153 struct ib_uverbs_event_file *ev_file,
154 struct ib_ucq_object *uobj)
156 struct ib_uverbs_event *evt, *tmp;
158 if (ev_file) {
159 spin_lock_irq(&ev_file->lock);
160 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
161 list_del(&evt->list);
162 kfree(evt);
164 spin_unlock_irq(&ev_file->lock);
166 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
169 spin_lock_irq(&file->async_file->lock);
170 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
171 list_del(&evt->list);
172 kfree(evt);
174 spin_unlock_irq(&file->async_file->lock);
177 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
178 struct ib_uevent_object *uobj)
180 struct ib_uverbs_event *evt, *tmp;
182 spin_lock_irq(&file->async_file->lock);
183 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
184 list_del(&evt->list);
185 kfree(evt);
187 spin_unlock_irq(&file->async_file->lock);
190 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
191 struct ib_uqp_object *uobj)
193 struct ib_uverbs_mcast_entry *mcast, *tmp;
195 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
196 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
197 list_del(&mcast->list);
198 kfree(mcast);
202 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
203 struct ib_ucontext *context)
205 struct ib_uobject *uobj, *tmp;
207 if (!context)
208 return 0;
210 context->closing = 1;
212 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
213 struct ib_ah *ah = uobj->object;
215 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
216 ib_destroy_ah(ah);
217 kfree(uobj);
220 /* Remove MWs before QPs, in order to support type 2A MWs. */
221 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
222 struct ib_mw *mw = uobj->object;
224 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
225 ib_dealloc_mw(mw);
226 kfree(uobj);
229 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
230 struct ib_flow *flow_id = uobj->object;
232 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
233 ib_destroy_flow(flow_id);
234 kfree(uobj);
237 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
238 struct ib_qp *qp = uobj->object;
239 struct ib_uqp_object *uqp =
240 container_of(uobj, struct ib_uqp_object, uevent.uobject);
242 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
243 if (qp != qp->real_qp) {
244 ib_close_qp(qp);
245 } else {
246 ib_uverbs_detach_umcast(qp, uqp);
247 ib_destroy_qp(qp);
249 ib_uverbs_release_uevent(file, &uqp->uevent);
250 kfree(uqp);
253 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
254 struct ib_srq *srq = uobj->object;
255 struct ib_uevent_object *uevent =
256 container_of(uobj, struct ib_uevent_object, uobject);
258 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
259 ib_destroy_srq(srq);
260 ib_uverbs_release_uevent(file, uevent);
261 kfree(uevent);
264 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
265 struct ib_cq *cq = uobj->object;
266 struct ib_uverbs_event_file *ev_file = cq->cq_context;
267 struct ib_ucq_object *ucq =
268 container_of(uobj, struct ib_ucq_object, uobject);
270 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
271 ib_destroy_cq(cq);
272 ib_uverbs_release_ucq(file, ev_file, ucq);
273 kfree(ucq);
276 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
277 struct ib_mr *mr = uobj->object;
279 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
280 ib_dereg_mr(mr);
281 kfree(uobj);
284 mutex_lock(&file->device->xrcd_tree_mutex);
285 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
286 struct ib_xrcd *xrcd = uobj->object;
287 struct ib_uxrcd_object *uxrcd =
288 container_of(uobj, struct ib_uxrcd_object, uobject);
290 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
291 ib_uverbs_dealloc_xrcd(file->device, xrcd);
292 kfree(uxrcd);
294 mutex_unlock(&file->device->xrcd_tree_mutex);
296 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
297 struct ib_pd *pd = uobj->object;
299 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
300 ib_dealloc_pd(pd);
301 kfree(uobj);
304 put_pid(context->tgid);
306 return context->device->dealloc_ucontext(context);
309 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
311 complete(&dev->comp);
314 static void ib_uverbs_release_file(struct kref *ref)
316 struct ib_uverbs_file *file =
317 container_of(ref, struct ib_uverbs_file, ref);
319 module_put(file->device->ib_dev->owner);
320 if (atomic_dec_and_test(&file->device->refcount))
321 ib_uverbs_comp_dev(file->device);
323 kfree(file);
326 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
327 size_t count, loff_t *pos)
329 struct ib_uverbs_event_file *file = filp->private_data;
330 struct ib_uverbs_event *event;
331 int eventsz;
332 int ret = 0;
334 spin_lock_irq(&file->lock);
336 while (list_empty(&file->event_list)) {
337 spin_unlock_irq(&file->lock);
339 if (filp->f_flags & O_NONBLOCK)
340 return -EAGAIN;
342 if (wait_event_interruptible(file->poll_wait,
343 !list_empty(&file->event_list)))
344 return -ERESTARTSYS;
346 spin_lock_irq(&file->lock);
349 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
351 if (file->is_async)
352 eventsz = sizeof (struct ib_uverbs_async_event_desc);
353 else
354 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
356 if (eventsz > count) {
357 ret = -EINVAL;
358 event = NULL;
359 } else {
360 list_del(file->event_list.next);
361 if (event->counter) {
362 ++(*event->counter);
363 list_del(&event->obj_list);
367 spin_unlock_irq(&file->lock);
369 if (event) {
370 if (copy_to_user(buf, event, eventsz))
371 ret = -EFAULT;
372 else
373 ret = eventsz;
376 kfree(event);
378 return ret;
381 static unsigned int ib_uverbs_event_poll(struct file *filp,
382 struct poll_table_struct *wait)
384 unsigned int pollflags = 0;
385 struct ib_uverbs_event_file *file = filp->private_data;
387 poll_wait(filp, &file->poll_wait, wait);
389 spin_lock_irq(&file->lock);
390 if (!list_empty(&file->event_list))
391 pollflags = POLLIN | POLLRDNORM;
392 spin_unlock_irq(&file->lock);
394 return pollflags;
397 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
399 struct ib_uverbs_event_file *file = filp->private_data;
401 return fasync_helper(fd, filp, on, &file->async_queue);
404 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
406 struct ib_uverbs_event_file *file = filp->private_data;
407 struct ib_uverbs_event *entry, *tmp;
409 spin_lock_irq(&file->lock);
410 file->is_closed = 1;
411 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
412 if (entry->counter)
413 list_del(&entry->obj_list);
414 kfree(entry);
416 spin_unlock_irq(&file->lock);
418 if (file->is_async) {
419 ib_unregister_event_handler(&file->uverbs_file->event_handler);
420 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
422 kref_put(&file->ref, ib_uverbs_release_event_file);
424 return 0;
427 static const struct file_operations uverbs_event_fops = {
428 .owner = THIS_MODULE,
429 .read = ib_uverbs_event_read,
430 .poll = ib_uverbs_event_poll,
431 .release = ib_uverbs_event_close,
432 .fasync = ib_uverbs_event_fasync,
433 .llseek = no_llseek,
436 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
438 struct ib_uverbs_event_file *file = cq_context;
439 struct ib_ucq_object *uobj;
440 struct ib_uverbs_event *entry;
441 unsigned long flags;
443 if (!file)
444 return;
446 spin_lock_irqsave(&file->lock, flags);
447 if (file->is_closed) {
448 spin_unlock_irqrestore(&file->lock, flags);
449 return;
452 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
453 if (!entry) {
454 spin_unlock_irqrestore(&file->lock, flags);
455 return;
458 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
460 entry->desc.comp.cq_handle = cq->uobject->user_handle;
461 entry->counter = &uobj->comp_events_reported;
463 list_add_tail(&entry->list, &file->event_list);
464 list_add_tail(&entry->obj_list, &uobj->comp_list);
465 spin_unlock_irqrestore(&file->lock, flags);
467 wake_up_interruptible(&file->poll_wait);
468 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
471 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
472 __u64 element, __u64 event,
473 struct list_head *obj_list,
474 u32 *counter)
476 struct ib_uverbs_event *entry;
477 unsigned long flags;
479 spin_lock_irqsave(&file->async_file->lock, flags);
480 if (file->async_file->is_closed) {
481 spin_unlock_irqrestore(&file->async_file->lock, flags);
482 return;
485 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
486 if (!entry) {
487 spin_unlock_irqrestore(&file->async_file->lock, flags);
488 return;
491 entry->desc.async.element = element;
492 entry->desc.async.event_type = event;
493 entry->desc.async.reserved = 0;
494 entry->counter = counter;
496 list_add_tail(&entry->list, &file->async_file->event_list);
497 if (obj_list)
498 list_add_tail(&entry->obj_list, obj_list);
499 spin_unlock_irqrestore(&file->async_file->lock, flags);
501 wake_up_interruptible(&file->async_file->poll_wait);
502 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
505 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
507 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
508 struct ib_ucq_object, uobject);
510 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
511 event->event, &uobj->async_list,
512 &uobj->async_events_reported);
515 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
517 struct ib_uevent_object *uobj;
519 /* for XRC target qp's, check that qp is live */
520 if (!event->element.qp->uobject || !event->element.qp->uobject->live)
521 return;
523 uobj = container_of(event->element.qp->uobject,
524 struct ib_uevent_object, uobject);
526 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
527 event->event, &uobj->event_list,
528 &uobj->events_reported);
531 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
533 struct ib_uevent_object *uobj;
535 uobj = container_of(event->element.srq->uobject,
536 struct ib_uevent_object, uobject);
538 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
539 event->event, &uobj->event_list,
540 &uobj->events_reported);
543 void ib_uverbs_event_handler(struct ib_event_handler *handler,
544 struct ib_event *event)
546 struct ib_uverbs_file *file =
547 container_of(handler, struct ib_uverbs_file, event_handler);
549 ib_uverbs_async_handler(file, event->element.port_num, event->event,
550 NULL, NULL);
553 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
554 int is_async)
556 struct ib_uverbs_event_file *ev_file;
557 struct file *filp;
559 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
560 if (!ev_file)
561 return ERR_PTR(-ENOMEM);
563 kref_init(&ev_file->ref);
564 spin_lock_init(&ev_file->lock);
565 INIT_LIST_HEAD(&ev_file->event_list);
566 init_waitqueue_head(&ev_file->poll_wait);
567 ev_file->uverbs_file = uverbs_file;
568 ev_file->async_queue = NULL;
569 ev_file->is_async = is_async;
570 ev_file->is_closed = 0;
572 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
573 ev_file, O_RDONLY);
574 if (IS_ERR(filp))
575 kfree(ev_file);
577 return filp;
581 * Look up a completion event file by FD. If lookup is successful,
582 * takes a ref to the event file struct that it returns; if
583 * unsuccessful, returns NULL.
585 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
587 struct ib_uverbs_event_file *ev_file = NULL;
588 struct fd f = fdget(fd);
590 if (!f.file)
591 return NULL;
593 if (f.file->f_op != &uverbs_event_fops)
594 goto out;
596 ev_file = f.file->private_data;
597 if (ev_file->is_async) {
598 ev_file = NULL;
599 goto out;
602 kref_get(&ev_file->ref);
604 out:
605 fdput(f);
606 return ev_file;
609 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
610 size_t count, loff_t *pos)
612 struct ib_uverbs_file *file = filp->private_data;
613 struct ib_uverbs_cmd_hdr hdr;
614 __u32 flags;
616 if (count < sizeof hdr)
617 return -EINVAL;
619 if (copy_from_user(&hdr, buf, sizeof hdr))
620 return -EFAULT;
622 flags = (hdr.command &
623 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
625 if (!flags) {
626 __u32 command;
628 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
629 IB_USER_VERBS_CMD_COMMAND_MASK))
630 return -EINVAL;
632 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
634 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
635 !uverbs_cmd_table[command])
636 return -EINVAL;
638 if (!file->ucontext &&
639 command != IB_USER_VERBS_CMD_GET_CONTEXT)
640 return -EINVAL;
642 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
643 return -ENOSYS;
645 if (hdr.in_words * 4 != count)
646 return -EINVAL;
648 return uverbs_cmd_table[command](file,
649 buf + sizeof(hdr),
650 hdr.in_words * 4,
651 hdr.out_words * 4);
653 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
654 __u32 command;
656 struct ib_uverbs_ex_cmd_hdr ex_hdr;
657 struct ib_udata ucore;
658 struct ib_udata uhw;
659 int err;
660 size_t written_count = count;
662 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
663 IB_USER_VERBS_CMD_COMMAND_MASK))
664 return -EINVAL;
666 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
668 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
669 !uverbs_ex_cmd_table[command])
670 return -ENOSYS;
672 if (!file->ucontext)
673 return -EINVAL;
675 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
676 return -ENOSYS;
678 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
679 return -EINVAL;
681 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
682 return -EFAULT;
684 count -= sizeof(hdr) + sizeof(ex_hdr);
685 buf += sizeof(hdr) + sizeof(ex_hdr);
687 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
688 return -EINVAL;
690 if (ex_hdr.cmd_hdr_reserved)
691 return -EINVAL;
693 if (ex_hdr.response) {
694 if (!hdr.out_words && !ex_hdr.provider_out_words)
695 return -EINVAL;
697 if (!access_ok(VERIFY_WRITE,
698 (void __user *) (unsigned long) ex_hdr.response,
699 (hdr.out_words + ex_hdr.provider_out_words) * 8))
700 return -EFAULT;
701 } else {
702 if (hdr.out_words || ex_hdr.provider_out_words)
703 return -EINVAL;
706 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
707 hdr.in_words * 8, hdr.out_words * 8);
709 INIT_UDATA_BUF_OR_NULL(&uhw,
710 buf + ucore.inlen,
711 (unsigned long) ex_hdr.response + ucore.outlen,
712 ex_hdr.provider_in_words * 8,
713 ex_hdr.provider_out_words * 8);
715 err = uverbs_ex_cmd_table[command](file,
716 &ucore,
717 &uhw);
719 if (err)
720 return err;
722 return written_count;
725 return -ENOSYS;
728 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
730 struct ib_uverbs_file *file = filp->private_data;
732 if (!file->ucontext)
733 return -ENODEV;
734 else
735 return file->device->ib_dev->mmap(file->ucontext, vma);
739 * ib_uverbs_open() does not need the BKL:
741 * - the ib_uverbs_device structures are properly reference counted and
742 * everything else is purely local to the file being created, so
743 * races against other open calls are not a problem;
744 * - there is no ioctl method to race against;
745 * - the open method will either immediately run -ENXIO, or all
746 * required initialization will be done.
748 static int ib_uverbs_open(struct inode *inode, struct file *filp)
750 struct ib_uverbs_device *dev;
751 struct ib_uverbs_file *file;
752 int ret;
754 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
755 if (!atomic_inc_not_zero(&dev->refcount))
756 return -ENXIO;
758 if (!try_module_get(dev->ib_dev->owner)) {
759 ret = -ENODEV;
760 goto err;
763 file = kmalloc(sizeof *file, GFP_KERNEL);
764 if (!file) {
765 ret = -ENOMEM;
766 goto err_module;
769 file->device = dev;
770 file->ucontext = NULL;
771 file->async_file = NULL;
772 kref_init(&file->ref);
773 mutex_init(&file->mutex);
775 filp->private_data = file;
776 kobject_get(&dev->kobj);
778 return nonseekable_open(inode, filp);
780 err_module:
781 module_put(dev->ib_dev->owner);
783 err:
784 if (atomic_dec_and_test(&dev->refcount))
785 ib_uverbs_comp_dev(dev);
787 return ret;
790 static int ib_uverbs_close(struct inode *inode, struct file *filp)
792 struct ib_uverbs_file *file = filp->private_data;
793 struct ib_uverbs_device *dev = file->device;
795 ib_uverbs_cleanup_ucontext(file, file->ucontext);
797 if (file->async_file)
798 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
800 kref_put(&file->ref, ib_uverbs_release_file);
801 kobject_put(&dev->kobj);
803 return 0;
806 static const struct file_operations uverbs_fops = {
807 .owner = THIS_MODULE,
808 .write = ib_uverbs_write,
809 .open = ib_uverbs_open,
810 .release = ib_uverbs_close,
811 .llseek = no_llseek,
814 static const struct file_operations uverbs_mmap_fops = {
815 .owner = THIS_MODULE,
816 .write = ib_uverbs_write,
817 .mmap = ib_uverbs_mmap,
818 .open = ib_uverbs_open,
819 .release = ib_uverbs_close,
820 .llseek = no_llseek,
823 static struct ib_client uverbs_client = {
824 .name = "uverbs",
825 .add = ib_uverbs_add_one,
826 .remove = ib_uverbs_remove_one
829 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
830 char *buf)
832 struct ib_uverbs_device *dev = dev_get_drvdata(device);
834 if (!dev)
835 return -ENODEV;
837 return sprintf(buf, "%s\n", dev->ib_dev->name);
839 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
841 static ssize_t show_dev_abi_version(struct device *device,
842 struct device_attribute *attr, char *buf)
844 struct ib_uverbs_device *dev = dev_get_drvdata(device);
846 if (!dev)
847 return -ENODEV;
849 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
851 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
853 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
854 __stringify(IB_USER_VERBS_ABI_VERSION));
856 static dev_t overflow_maj;
857 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
860 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
861 * requesting a new major number and doubling the number of max devices we
862 * support. It's stupid, but simple.
864 static int find_overflow_devnum(void)
866 int ret;
868 if (!overflow_maj) {
869 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
870 "infiniband_verbs");
871 if (ret) {
872 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
873 return ret;
877 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
878 if (ret >= IB_UVERBS_MAX_DEVICES)
879 return -1;
881 return ret;
884 static void ib_uverbs_add_one(struct ib_device *device)
886 int devnum;
887 dev_t base;
888 struct ib_uverbs_device *uverbs_dev;
890 if (!device->alloc_ucontext)
891 return;
893 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
894 if (!uverbs_dev)
895 return;
897 atomic_set(&uverbs_dev->refcount, 1);
898 init_completion(&uverbs_dev->comp);
899 uverbs_dev->xrcd_tree = RB_ROOT;
900 mutex_init(&uverbs_dev->xrcd_tree_mutex);
901 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
903 spin_lock(&map_lock);
904 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
905 if (devnum >= IB_UVERBS_MAX_DEVICES) {
906 spin_unlock(&map_lock);
907 devnum = find_overflow_devnum();
908 if (devnum < 0)
909 goto err;
911 spin_lock(&map_lock);
912 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
913 base = devnum + overflow_maj;
914 set_bit(devnum, overflow_map);
915 } else {
916 uverbs_dev->devnum = devnum;
917 base = devnum + IB_UVERBS_BASE_DEV;
918 set_bit(devnum, dev_map);
920 spin_unlock(&map_lock);
922 uverbs_dev->ib_dev = device;
923 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
925 cdev_init(&uverbs_dev->cdev, NULL);
926 uverbs_dev->cdev.owner = THIS_MODULE;
927 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
928 uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
929 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
930 if (cdev_add(&uverbs_dev->cdev, base, 1))
931 goto err_cdev;
933 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
934 uverbs_dev->cdev.dev, uverbs_dev,
935 "uverbs%d", uverbs_dev->devnum);
936 if (IS_ERR(uverbs_dev->dev))
937 goto err_cdev;
939 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
940 goto err_class;
941 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
942 goto err_class;
944 ib_set_client_data(device, &uverbs_client, uverbs_dev);
946 return;
948 err_class:
949 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
951 err_cdev:
952 cdev_del(&uverbs_dev->cdev);
953 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
954 clear_bit(devnum, dev_map);
955 else
956 clear_bit(devnum, overflow_map);
958 err:
959 if (atomic_dec_and_test(&uverbs_dev->refcount))
960 ib_uverbs_comp_dev(uverbs_dev);
961 wait_for_completion(&uverbs_dev->comp);
962 kobject_put(&uverbs_dev->kobj);
963 return;
966 static void ib_uverbs_remove_one(struct ib_device *device)
968 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
970 if (!uverbs_dev)
971 return;
973 dev_set_drvdata(uverbs_dev->dev, NULL);
974 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
975 cdev_del(&uverbs_dev->cdev);
977 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
978 clear_bit(uverbs_dev->devnum, dev_map);
979 else
980 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
982 if (atomic_dec_and_test(&uverbs_dev->refcount))
983 ib_uverbs_comp_dev(uverbs_dev);
984 wait_for_completion(&uverbs_dev->comp);
985 kobject_put(&uverbs_dev->kobj);
988 static char *uverbs_devnode(struct device *dev, umode_t *mode)
990 if (mode)
991 *mode = 0666;
992 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
995 static int __init ib_uverbs_init(void)
997 int ret;
999 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1000 "infiniband_verbs");
1001 if (ret) {
1002 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1003 goto out;
1006 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1007 if (IS_ERR(uverbs_class)) {
1008 ret = PTR_ERR(uverbs_class);
1009 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1010 goto out_chrdev;
1013 uverbs_class->devnode = uverbs_devnode;
1015 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1016 if (ret) {
1017 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1018 goto out_class;
1021 ret = ib_register_client(&uverbs_client);
1022 if (ret) {
1023 printk(KERN_ERR "user_verbs: couldn't register client\n");
1024 goto out_class;
1027 return 0;
1029 out_class:
1030 class_destroy(uverbs_class);
1032 out_chrdev:
1033 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1035 out:
1036 return ret;
1039 static void __exit ib_uverbs_cleanup(void)
1041 ib_unregister_client(&uverbs_client);
1042 class_destroy(uverbs_class);
1043 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1044 if (overflow_maj)
1045 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1046 idr_destroy(&ib_uverbs_pd_idr);
1047 idr_destroy(&ib_uverbs_mr_idr);
1048 idr_destroy(&ib_uverbs_mw_idr);
1049 idr_destroy(&ib_uverbs_ah_idr);
1050 idr_destroy(&ib_uverbs_cq_idr);
1051 idr_destroy(&ib_uverbs_qp_idr);
1052 idr_destroy(&ib_uverbs_srq_idr);
1055 module_init(ib_uverbs_init);
1056 module_exit(ib_uverbs_cleanup);