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
18 * - Redistributions of source code must retain the above
19 * copyright notice, this list of conditions and the following
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
37 #include <linux/module.h>
38 #include <linux/init.h>
39 #include <linux/device.h>
40 #include <linux/err.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 <linux/uaccess.h>
52 #include <rdma/uverbs_std_types.h>
55 #include "core_priv.h"
56 #include "rdma_core.h"
58 MODULE_AUTHOR("Roland Dreier");
59 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
60 MODULE_LICENSE("Dual BSD/GPL");
63 IB_UVERBS_MAJOR
= 231,
64 IB_UVERBS_BASE_MINOR
= 192,
65 IB_UVERBS_MAX_DEVICES
= 32
68 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
70 static struct class *uverbs_class
;
72 static DEFINE_SPINLOCK(map_lock
);
73 static DECLARE_BITMAP(dev_map
, IB_UVERBS_MAX_DEVICES
);
75 static ssize_t (*uverbs_cmd_table
[])(struct ib_uverbs_file
*file
,
76 struct ib_device
*ib_dev
,
77 const char __user
*buf
, int in_len
,
79 [IB_USER_VERBS_CMD_GET_CONTEXT
] = ib_uverbs_get_context
,
80 [IB_USER_VERBS_CMD_QUERY_DEVICE
] = ib_uverbs_query_device
,
81 [IB_USER_VERBS_CMD_QUERY_PORT
] = ib_uverbs_query_port
,
82 [IB_USER_VERBS_CMD_ALLOC_PD
] = ib_uverbs_alloc_pd
,
83 [IB_USER_VERBS_CMD_DEALLOC_PD
] = ib_uverbs_dealloc_pd
,
84 [IB_USER_VERBS_CMD_REG_MR
] = ib_uverbs_reg_mr
,
85 [IB_USER_VERBS_CMD_REREG_MR
] = ib_uverbs_rereg_mr
,
86 [IB_USER_VERBS_CMD_DEREG_MR
] = ib_uverbs_dereg_mr
,
87 [IB_USER_VERBS_CMD_ALLOC_MW
] = ib_uverbs_alloc_mw
,
88 [IB_USER_VERBS_CMD_DEALLOC_MW
] = ib_uverbs_dealloc_mw
,
89 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL
] = ib_uverbs_create_comp_channel
,
90 [IB_USER_VERBS_CMD_CREATE_CQ
] = ib_uverbs_create_cq
,
91 [IB_USER_VERBS_CMD_RESIZE_CQ
] = ib_uverbs_resize_cq
,
92 [IB_USER_VERBS_CMD_POLL_CQ
] = ib_uverbs_poll_cq
,
93 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ
] = ib_uverbs_req_notify_cq
,
94 [IB_USER_VERBS_CMD_DESTROY_CQ
] = ib_uverbs_destroy_cq
,
95 [IB_USER_VERBS_CMD_CREATE_QP
] = ib_uverbs_create_qp
,
96 [IB_USER_VERBS_CMD_QUERY_QP
] = ib_uverbs_query_qp
,
97 [IB_USER_VERBS_CMD_MODIFY_QP
] = ib_uverbs_modify_qp
,
98 [IB_USER_VERBS_CMD_DESTROY_QP
] = ib_uverbs_destroy_qp
,
99 [IB_USER_VERBS_CMD_POST_SEND
] = ib_uverbs_post_send
,
100 [IB_USER_VERBS_CMD_POST_RECV
] = ib_uverbs_post_recv
,
101 [IB_USER_VERBS_CMD_POST_SRQ_RECV
] = ib_uverbs_post_srq_recv
,
102 [IB_USER_VERBS_CMD_CREATE_AH
] = ib_uverbs_create_ah
,
103 [IB_USER_VERBS_CMD_DESTROY_AH
] = ib_uverbs_destroy_ah
,
104 [IB_USER_VERBS_CMD_ATTACH_MCAST
] = ib_uverbs_attach_mcast
,
105 [IB_USER_VERBS_CMD_DETACH_MCAST
] = ib_uverbs_detach_mcast
,
106 [IB_USER_VERBS_CMD_CREATE_SRQ
] = ib_uverbs_create_srq
,
107 [IB_USER_VERBS_CMD_MODIFY_SRQ
] = ib_uverbs_modify_srq
,
108 [IB_USER_VERBS_CMD_QUERY_SRQ
] = ib_uverbs_query_srq
,
109 [IB_USER_VERBS_CMD_DESTROY_SRQ
] = ib_uverbs_destroy_srq
,
110 [IB_USER_VERBS_CMD_OPEN_XRCD
] = ib_uverbs_open_xrcd
,
111 [IB_USER_VERBS_CMD_CLOSE_XRCD
] = ib_uverbs_close_xrcd
,
112 [IB_USER_VERBS_CMD_CREATE_XSRQ
] = ib_uverbs_create_xsrq
,
113 [IB_USER_VERBS_CMD_OPEN_QP
] = ib_uverbs_open_qp
,
116 static int (*uverbs_ex_cmd_table
[])(struct ib_uverbs_file
*file
,
117 struct ib_device
*ib_dev
,
118 struct ib_udata
*ucore
,
119 struct ib_udata
*uhw
) = {
120 [IB_USER_VERBS_EX_CMD_CREATE_FLOW
] = ib_uverbs_ex_create_flow
,
121 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW
] = ib_uverbs_ex_destroy_flow
,
122 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE
] = ib_uverbs_ex_query_device
,
123 [IB_USER_VERBS_EX_CMD_CREATE_CQ
] = ib_uverbs_ex_create_cq
,
124 [IB_USER_VERBS_EX_CMD_CREATE_QP
] = ib_uverbs_ex_create_qp
,
125 [IB_USER_VERBS_EX_CMD_CREATE_WQ
] = ib_uverbs_ex_create_wq
,
126 [IB_USER_VERBS_EX_CMD_MODIFY_WQ
] = ib_uverbs_ex_modify_wq
,
127 [IB_USER_VERBS_EX_CMD_DESTROY_WQ
] = ib_uverbs_ex_destroy_wq
,
128 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL
] = ib_uverbs_ex_create_rwq_ind_table
,
129 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL
] = ib_uverbs_ex_destroy_rwq_ind_table
,
130 [IB_USER_VERBS_EX_CMD_MODIFY_QP
] = ib_uverbs_ex_modify_qp
,
131 [IB_USER_VERBS_EX_CMD_MODIFY_CQ
] = ib_uverbs_ex_modify_cq
,
134 static void ib_uverbs_add_one(struct ib_device
*device
);
135 static void ib_uverbs_remove_one(struct ib_device
*device
, void *client_data
);
137 int uverbs_dealloc_mw(struct ib_mw
*mw
)
139 struct ib_pd
*pd
= mw
->pd
;
142 ret
= mw
->device
->dealloc_mw(mw
);
144 atomic_dec(&pd
->usecnt
);
148 static void ib_uverbs_release_dev(struct kobject
*kobj
)
150 struct ib_uverbs_device
*dev
=
151 container_of(kobj
, struct ib_uverbs_device
, kobj
);
153 cleanup_srcu_struct(&dev
->disassociate_srcu
);
157 static struct kobj_type ib_uverbs_dev_ktype
= {
158 .release
= ib_uverbs_release_dev
,
161 static void ib_uverbs_release_async_event_file(struct kref
*ref
)
163 struct ib_uverbs_async_event_file
*file
=
164 container_of(ref
, struct ib_uverbs_async_event_file
, ref
);
169 void ib_uverbs_release_ucq(struct ib_uverbs_file
*file
,
170 struct ib_uverbs_completion_event_file
*ev_file
,
171 struct ib_ucq_object
*uobj
)
173 struct ib_uverbs_event
*evt
, *tmp
;
176 spin_lock_irq(&ev_file
->ev_queue
.lock
);
177 list_for_each_entry_safe(evt
, tmp
, &uobj
->comp_list
, obj_list
) {
178 list_del(&evt
->list
);
181 spin_unlock_irq(&ev_file
->ev_queue
.lock
);
183 uverbs_uobject_put(&ev_file
->uobj_file
.uobj
);
186 spin_lock_irq(&file
->async_file
->ev_queue
.lock
);
187 list_for_each_entry_safe(evt
, tmp
, &uobj
->async_list
, obj_list
) {
188 list_del(&evt
->list
);
191 spin_unlock_irq(&file
->async_file
->ev_queue
.lock
);
194 void ib_uverbs_release_uevent(struct ib_uverbs_file
*file
,
195 struct ib_uevent_object
*uobj
)
197 struct ib_uverbs_event
*evt
, *tmp
;
199 spin_lock_irq(&file
->async_file
->ev_queue
.lock
);
200 list_for_each_entry_safe(evt
, tmp
, &uobj
->event_list
, obj_list
) {
201 list_del(&evt
->list
);
204 spin_unlock_irq(&file
->async_file
->ev_queue
.lock
);
207 void ib_uverbs_detach_umcast(struct ib_qp
*qp
,
208 struct ib_uqp_object
*uobj
)
210 struct ib_uverbs_mcast_entry
*mcast
, *tmp
;
212 list_for_each_entry_safe(mcast
, tmp
, &uobj
->mcast_list
, list
) {
213 ib_detach_mcast(qp
, &mcast
->gid
, mcast
->lid
);
214 list_del(&mcast
->list
);
219 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file
*file
,
220 struct ib_ucontext
*context
,
223 context
->closing
= 1;
224 uverbs_cleanup_ucontext(context
, device_removed
);
225 put_pid(context
->tgid
);
227 ib_rdmacg_uncharge(&context
->cg_obj
, context
->device
,
228 RDMACG_RESOURCE_HCA_HANDLE
);
230 return context
->device
->dealloc_ucontext(context
);
233 static void ib_uverbs_comp_dev(struct ib_uverbs_device
*dev
)
235 complete(&dev
->comp
);
238 void ib_uverbs_release_file(struct kref
*ref
)
240 struct ib_uverbs_file
*file
=
241 container_of(ref
, struct ib_uverbs_file
, ref
);
242 struct ib_device
*ib_dev
;
245 srcu_key
= srcu_read_lock(&file
->device
->disassociate_srcu
);
246 ib_dev
= srcu_dereference(file
->device
->ib_dev
,
247 &file
->device
->disassociate_srcu
);
248 if (ib_dev
&& !ib_dev
->disassociate_ucontext
)
249 module_put(ib_dev
->owner
);
250 srcu_read_unlock(&file
->device
->disassociate_srcu
, srcu_key
);
252 if (atomic_dec_and_test(&file
->device
->refcount
))
253 ib_uverbs_comp_dev(file
->device
);
255 kobject_put(&file
->device
->kobj
);
259 static ssize_t
ib_uverbs_event_read(struct ib_uverbs_event_queue
*ev_queue
,
260 struct ib_uverbs_file
*uverbs_file
,
261 struct file
*filp
, char __user
*buf
,
262 size_t count
, loff_t
*pos
,
265 struct ib_uverbs_event
*event
;
268 spin_lock_irq(&ev_queue
->lock
);
270 while (list_empty(&ev_queue
->event_list
)) {
271 spin_unlock_irq(&ev_queue
->lock
);
273 if (filp
->f_flags
& O_NONBLOCK
)
276 if (wait_event_interruptible(ev_queue
->poll_wait
,
277 (!list_empty(&ev_queue
->event_list
) ||
278 /* The barriers built into wait_event_interruptible()
279 * and wake_up() guarentee this will see the null set
282 !uverbs_file
->device
->ib_dev
)))
285 /* If device was disassociated and no event exists set an error */
286 if (list_empty(&ev_queue
->event_list
) &&
287 !uverbs_file
->device
->ib_dev
)
290 spin_lock_irq(&ev_queue
->lock
);
293 event
= list_entry(ev_queue
->event_list
.next
, struct ib_uverbs_event
, list
);
295 if (eventsz
> count
) {
299 list_del(ev_queue
->event_list
.next
);
300 if (event
->counter
) {
302 list_del(&event
->obj_list
);
306 spin_unlock_irq(&ev_queue
->lock
);
309 if (copy_to_user(buf
, event
, eventsz
))
320 static ssize_t
ib_uverbs_async_event_read(struct file
*filp
, char __user
*buf
,
321 size_t count
, loff_t
*pos
)
323 struct ib_uverbs_async_event_file
*file
= filp
->private_data
;
325 return ib_uverbs_event_read(&file
->ev_queue
, file
->uverbs_file
, filp
,
327 sizeof(struct ib_uverbs_async_event_desc
));
330 static ssize_t
ib_uverbs_comp_event_read(struct file
*filp
, char __user
*buf
,
331 size_t count
, loff_t
*pos
)
333 struct ib_uverbs_completion_event_file
*comp_ev_file
=
336 return ib_uverbs_event_read(&comp_ev_file
->ev_queue
,
337 comp_ev_file
->uobj_file
.ufile
, filp
,
339 sizeof(struct ib_uverbs_comp_event_desc
));
342 static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue
*ev_queue
,
344 struct poll_table_struct
*wait
)
346 unsigned int pollflags
= 0;
348 poll_wait(filp
, &ev_queue
->poll_wait
, wait
);
350 spin_lock_irq(&ev_queue
->lock
);
351 if (!list_empty(&ev_queue
->event_list
))
352 pollflags
= POLLIN
| POLLRDNORM
;
353 spin_unlock_irq(&ev_queue
->lock
);
358 static unsigned int ib_uverbs_async_event_poll(struct file
*filp
,
359 struct poll_table_struct
*wait
)
361 return ib_uverbs_event_poll(filp
->private_data
, filp
, wait
);
364 static unsigned int ib_uverbs_comp_event_poll(struct file
*filp
,
365 struct poll_table_struct
*wait
)
367 struct ib_uverbs_completion_event_file
*comp_ev_file
=
370 return ib_uverbs_event_poll(&comp_ev_file
->ev_queue
, filp
, wait
);
373 static int ib_uverbs_async_event_fasync(int fd
, struct file
*filp
, int on
)
375 struct ib_uverbs_event_queue
*ev_queue
= filp
->private_data
;
377 return fasync_helper(fd
, filp
, on
, &ev_queue
->async_queue
);
380 static int ib_uverbs_comp_event_fasync(int fd
, struct file
*filp
, int on
)
382 struct ib_uverbs_completion_event_file
*comp_ev_file
=
385 return fasync_helper(fd
, filp
, on
, &comp_ev_file
->ev_queue
.async_queue
);
388 static int ib_uverbs_async_event_close(struct inode
*inode
, struct file
*filp
)
390 struct ib_uverbs_async_event_file
*file
= filp
->private_data
;
391 struct ib_uverbs_file
*uverbs_file
= file
->uverbs_file
;
392 struct ib_uverbs_event
*entry
, *tmp
;
393 int closed_already
= 0;
395 mutex_lock(&uverbs_file
->device
->lists_mutex
);
396 spin_lock_irq(&file
->ev_queue
.lock
);
397 closed_already
= file
->ev_queue
.is_closed
;
398 file
->ev_queue
.is_closed
= 1;
399 list_for_each_entry_safe(entry
, tmp
, &file
->ev_queue
.event_list
, list
) {
401 list_del(&entry
->obj_list
);
404 spin_unlock_irq(&file
->ev_queue
.lock
);
405 if (!closed_already
) {
406 list_del(&file
->list
);
407 ib_unregister_event_handler(&uverbs_file
->event_handler
);
409 mutex_unlock(&uverbs_file
->device
->lists_mutex
);
411 kref_put(&uverbs_file
->ref
, ib_uverbs_release_file
);
412 kref_put(&file
->ref
, ib_uverbs_release_async_event_file
);
417 static int ib_uverbs_comp_event_close(struct inode
*inode
, struct file
*filp
)
419 struct ib_uverbs_completion_event_file
*file
= filp
->private_data
;
420 struct ib_uverbs_event
*entry
, *tmp
;
422 spin_lock_irq(&file
->ev_queue
.lock
);
423 list_for_each_entry_safe(entry
, tmp
, &file
->ev_queue
.event_list
, list
) {
425 list_del(&entry
->obj_list
);
428 spin_unlock_irq(&file
->ev_queue
.lock
);
430 uverbs_close_fd(filp
);
435 const struct file_operations uverbs_event_fops
= {
436 .owner
= THIS_MODULE
,
437 .read
= ib_uverbs_comp_event_read
,
438 .poll
= ib_uverbs_comp_event_poll
,
439 .release
= ib_uverbs_comp_event_close
,
440 .fasync
= ib_uverbs_comp_event_fasync
,
444 static const struct file_operations uverbs_async_event_fops
= {
445 .owner
= THIS_MODULE
,
446 .read
= ib_uverbs_async_event_read
,
447 .poll
= ib_uverbs_async_event_poll
,
448 .release
= ib_uverbs_async_event_close
,
449 .fasync
= ib_uverbs_async_event_fasync
,
453 void ib_uverbs_comp_handler(struct ib_cq
*cq
, void *cq_context
)
455 struct ib_uverbs_event_queue
*ev_queue
= cq_context
;
456 struct ib_ucq_object
*uobj
;
457 struct ib_uverbs_event
*entry
;
463 spin_lock_irqsave(&ev_queue
->lock
, flags
);
464 if (ev_queue
->is_closed
) {
465 spin_unlock_irqrestore(&ev_queue
->lock
, flags
);
469 entry
= kmalloc(sizeof *entry
, GFP_ATOMIC
);
471 spin_unlock_irqrestore(&ev_queue
->lock
, flags
);
475 uobj
= container_of(cq
->uobject
, struct ib_ucq_object
, uobject
);
477 entry
->desc
.comp
.cq_handle
= cq
->uobject
->user_handle
;
478 entry
->counter
= &uobj
->comp_events_reported
;
480 list_add_tail(&entry
->list
, &ev_queue
->event_list
);
481 list_add_tail(&entry
->obj_list
, &uobj
->comp_list
);
482 spin_unlock_irqrestore(&ev_queue
->lock
, flags
);
484 wake_up_interruptible(&ev_queue
->poll_wait
);
485 kill_fasync(&ev_queue
->async_queue
, SIGIO
, POLL_IN
);
488 static void ib_uverbs_async_handler(struct ib_uverbs_file
*file
,
489 __u64 element
, __u64 event
,
490 struct list_head
*obj_list
,
493 struct ib_uverbs_event
*entry
;
496 spin_lock_irqsave(&file
->async_file
->ev_queue
.lock
, flags
);
497 if (file
->async_file
->ev_queue
.is_closed
) {
498 spin_unlock_irqrestore(&file
->async_file
->ev_queue
.lock
, flags
);
502 entry
= kmalloc(sizeof *entry
, GFP_ATOMIC
);
504 spin_unlock_irqrestore(&file
->async_file
->ev_queue
.lock
, flags
);
508 entry
->desc
.async
.element
= element
;
509 entry
->desc
.async
.event_type
= event
;
510 entry
->desc
.async
.reserved
= 0;
511 entry
->counter
= counter
;
513 list_add_tail(&entry
->list
, &file
->async_file
->ev_queue
.event_list
);
515 list_add_tail(&entry
->obj_list
, obj_list
);
516 spin_unlock_irqrestore(&file
->async_file
->ev_queue
.lock
, flags
);
518 wake_up_interruptible(&file
->async_file
->ev_queue
.poll_wait
);
519 kill_fasync(&file
->async_file
->ev_queue
.async_queue
, SIGIO
, POLL_IN
);
522 void ib_uverbs_cq_event_handler(struct ib_event
*event
, void *context_ptr
)
524 struct ib_ucq_object
*uobj
= container_of(event
->element
.cq
->uobject
,
525 struct ib_ucq_object
, uobject
);
527 ib_uverbs_async_handler(uobj
->uverbs_file
, uobj
->uobject
.user_handle
,
528 event
->event
, &uobj
->async_list
,
529 &uobj
->async_events_reported
);
532 void ib_uverbs_qp_event_handler(struct ib_event
*event
, void *context_ptr
)
534 struct ib_uevent_object
*uobj
;
536 /* for XRC target qp's, check that qp is live */
537 if (!event
->element
.qp
->uobject
)
540 uobj
= container_of(event
->element
.qp
->uobject
,
541 struct ib_uevent_object
, uobject
);
543 ib_uverbs_async_handler(context_ptr
, uobj
->uobject
.user_handle
,
544 event
->event
, &uobj
->event_list
,
545 &uobj
->events_reported
);
548 void ib_uverbs_wq_event_handler(struct ib_event
*event
, void *context_ptr
)
550 struct ib_uevent_object
*uobj
= container_of(event
->element
.wq
->uobject
,
551 struct ib_uevent_object
, uobject
);
553 ib_uverbs_async_handler(context_ptr
, uobj
->uobject
.user_handle
,
554 event
->event
, &uobj
->event_list
,
555 &uobj
->events_reported
);
558 void ib_uverbs_srq_event_handler(struct ib_event
*event
, void *context_ptr
)
560 struct ib_uevent_object
*uobj
;
562 uobj
= container_of(event
->element
.srq
->uobject
,
563 struct ib_uevent_object
, uobject
);
565 ib_uverbs_async_handler(context_ptr
, uobj
->uobject
.user_handle
,
566 event
->event
, &uobj
->event_list
,
567 &uobj
->events_reported
);
570 void ib_uverbs_event_handler(struct ib_event_handler
*handler
,
571 struct ib_event
*event
)
573 struct ib_uverbs_file
*file
=
574 container_of(handler
, struct ib_uverbs_file
, event_handler
);
576 ib_uverbs_async_handler(file
, event
->element
.port_num
, event
->event
,
580 void ib_uverbs_free_async_event_file(struct ib_uverbs_file
*file
)
582 kref_put(&file
->async_file
->ref
, ib_uverbs_release_async_event_file
);
583 file
->async_file
= NULL
;
586 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue
*ev_queue
)
588 spin_lock_init(&ev_queue
->lock
);
589 INIT_LIST_HEAD(&ev_queue
->event_list
);
590 init_waitqueue_head(&ev_queue
->poll_wait
);
591 ev_queue
->is_closed
= 0;
592 ev_queue
->async_queue
= NULL
;
595 struct file
*ib_uverbs_alloc_async_event_file(struct ib_uverbs_file
*uverbs_file
,
596 struct ib_device
*ib_dev
)
598 struct ib_uverbs_async_event_file
*ev_file
;
601 ev_file
= kzalloc(sizeof(*ev_file
), GFP_KERNEL
);
603 return ERR_PTR(-ENOMEM
);
605 ib_uverbs_init_event_queue(&ev_file
->ev_queue
);
606 ev_file
->uverbs_file
= uverbs_file
;
607 kref_get(&ev_file
->uverbs_file
->ref
);
608 kref_init(&ev_file
->ref
);
609 filp
= anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops
,
614 mutex_lock(&uverbs_file
->device
->lists_mutex
);
615 list_add_tail(&ev_file
->list
,
616 &uverbs_file
->device
->uverbs_events_file_list
);
617 mutex_unlock(&uverbs_file
->device
->lists_mutex
);
619 WARN_ON(uverbs_file
->async_file
);
620 uverbs_file
->async_file
= ev_file
;
621 kref_get(&uverbs_file
->async_file
->ref
);
622 INIT_IB_EVENT_HANDLER(&uverbs_file
->event_handler
,
624 ib_uverbs_event_handler
);
625 ib_register_event_handler(&uverbs_file
->event_handler
);
626 /* At that point async file stuff was fully set */
631 kref_put(&ev_file
->uverbs_file
->ref
, ib_uverbs_release_file
);
632 kref_put(&ev_file
->ref
, ib_uverbs_release_async_event_file
);
636 static int verify_command_mask(struct ib_device
*ib_dev
, __u32 command
)
640 if (command
<= IB_USER_VERBS_CMD_OPEN_QP
)
641 mask
= ib_dev
->uverbs_cmd_mask
;
643 mask
= ib_dev
->uverbs_ex_cmd_mask
;
645 if (mask
& ((u64
)1 << command
))
651 static ssize_t
ib_uverbs_write(struct file
*filp
, const char __user
*buf
,
652 size_t count
, loff_t
*pos
)
654 struct ib_uverbs_file
*file
= filp
->private_data
;
655 struct ib_device
*ib_dev
;
656 struct ib_uverbs_cmd_hdr hdr
;
662 if (!ib_safe_file_access(filp
)) {
663 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
664 task_tgid_vnr(current
), current
->comm
);
668 if (count
< sizeof hdr
)
671 if (copy_from_user(&hdr
, buf
, sizeof hdr
))
674 srcu_key
= srcu_read_lock(&file
->device
->disassociate_srcu
);
675 ib_dev
= srcu_dereference(file
->device
->ib_dev
,
676 &file
->device
->disassociate_srcu
);
682 if (hdr
.command
& ~(__u32
)(IB_USER_VERBS_CMD_FLAGS_MASK
|
683 IB_USER_VERBS_CMD_COMMAND_MASK
)) {
688 command
= hdr
.command
& IB_USER_VERBS_CMD_COMMAND_MASK
;
689 if (verify_command_mask(ib_dev
, command
)) {
694 if (!file
->ucontext
&&
695 command
!= IB_USER_VERBS_CMD_GET_CONTEXT
) {
700 flags
= (hdr
.command
&
701 IB_USER_VERBS_CMD_FLAGS_MASK
) >> IB_USER_VERBS_CMD_FLAGS_SHIFT
;
704 if (command
>= ARRAY_SIZE(uverbs_cmd_table
) ||
705 !uverbs_cmd_table
[command
]) {
710 if (hdr
.in_words
* 4 != count
) {
715 ret
= uverbs_cmd_table
[command
](file
, ib_dev
,
720 } else if (flags
== IB_USER_VERBS_CMD_FLAG_EXTENDED
) {
721 struct ib_uverbs_ex_cmd_hdr ex_hdr
;
722 struct ib_udata ucore
;
724 size_t written_count
= count
;
726 if (command
>= ARRAY_SIZE(uverbs_ex_cmd_table
) ||
727 !uverbs_ex_cmd_table
[command
]) {
732 if (!file
->ucontext
) {
737 if (count
< (sizeof(hdr
) + sizeof(ex_hdr
))) {
742 if (copy_from_user(&ex_hdr
, buf
+ sizeof(hdr
), sizeof(ex_hdr
))) {
747 count
-= sizeof(hdr
) + sizeof(ex_hdr
);
748 buf
+= sizeof(hdr
) + sizeof(ex_hdr
);
750 if ((hdr
.in_words
+ ex_hdr
.provider_in_words
) * 8 != count
) {
755 if (ex_hdr
.cmd_hdr_reserved
) {
760 if (ex_hdr
.response
) {
761 if (!hdr
.out_words
&& !ex_hdr
.provider_out_words
) {
766 if (!access_ok(VERIFY_WRITE
,
767 u64_to_user_ptr(ex_hdr
.response
),
768 (hdr
.out_words
+ ex_hdr
.provider_out_words
) * 8)) {
773 if (hdr
.out_words
|| ex_hdr
.provider_out_words
) {
779 ib_uverbs_init_udata_buf_or_null(&ucore
, buf
,
780 u64_to_user_ptr(ex_hdr
.response
),
781 hdr
.in_words
* 8, hdr
.out_words
* 8);
783 ib_uverbs_init_udata_buf_or_null(&uhw
,
785 u64_to_user_ptr(ex_hdr
.response
) + ucore
.outlen
,
786 ex_hdr
.provider_in_words
* 8,
787 ex_hdr
.provider_out_words
* 8);
789 ret
= uverbs_ex_cmd_table
[command
](file
, ib_dev
, &ucore
, &uhw
);
797 srcu_read_unlock(&file
->device
->disassociate_srcu
, srcu_key
);
801 static int ib_uverbs_mmap(struct file
*filp
, struct vm_area_struct
*vma
)
803 struct ib_uverbs_file
*file
= filp
->private_data
;
804 struct ib_device
*ib_dev
;
808 srcu_key
= srcu_read_lock(&file
->device
->disassociate_srcu
);
809 ib_dev
= srcu_dereference(file
->device
->ib_dev
,
810 &file
->device
->disassociate_srcu
);
819 ret
= ib_dev
->mmap(file
->ucontext
, vma
);
821 srcu_read_unlock(&file
->device
->disassociate_srcu
, srcu_key
);
826 * ib_uverbs_open() does not need the BKL:
828 * - the ib_uverbs_device structures are properly reference counted and
829 * everything else is purely local to the file being created, so
830 * races against other open calls are not a problem;
831 * - there is no ioctl method to race against;
832 * - the open method will either immediately run -ENXIO, or all
833 * required initialization will be done.
835 static int ib_uverbs_open(struct inode
*inode
, struct file
*filp
)
837 struct ib_uverbs_device
*dev
;
838 struct ib_uverbs_file
*file
;
839 struct ib_device
*ib_dev
;
841 int module_dependent
;
844 dev
= container_of(inode
->i_cdev
, struct ib_uverbs_device
, cdev
);
845 if (!atomic_inc_not_zero(&dev
->refcount
))
848 srcu_key
= srcu_read_lock(&dev
->disassociate_srcu
);
849 mutex_lock(&dev
->lists_mutex
);
850 ib_dev
= srcu_dereference(dev
->ib_dev
,
851 &dev
->disassociate_srcu
);
857 /* In case IB device supports disassociate ucontext, there is no hard
858 * dependency between uverbs device and its low level device.
860 module_dependent
= !(ib_dev
->disassociate_ucontext
);
862 if (module_dependent
) {
863 if (!try_module_get(ib_dev
->owner
)) {
869 file
= kzalloc(sizeof(*file
), GFP_KERNEL
);
872 if (module_dependent
)
879 spin_lock_init(&file
->idr_lock
);
880 idr_init(&file
->idr
);
881 file
->ucontext
= NULL
;
882 file
->async_file
= NULL
;
883 kref_init(&file
->ref
);
884 mutex_init(&file
->mutex
);
885 mutex_init(&file
->cleanup_mutex
);
887 filp
->private_data
= file
;
888 kobject_get(&dev
->kobj
);
889 list_add_tail(&file
->list
, &dev
->uverbs_file_list
);
890 mutex_unlock(&dev
->lists_mutex
);
891 srcu_read_unlock(&dev
->disassociate_srcu
, srcu_key
);
893 return nonseekable_open(inode
, filp
);
896 module_put(ib_dev
->owner
);
899 mutex_unlock(&dev
->lists_mutex
);
900 srcu_read_unlock(&dev
->disassociate_srcu
, srcu_key
);
901 if (atomic_dec_and_test(&dev
->refcount
))
902 ib_uverbs_comp_dev(dev
);
907 static int ib_uverbs_close(struct inode
*inode
, struct file
*filp
)
909 struct ib_uverbs_file
*file
= filp
->private_data
;
911 mutex_lock(&file
->cleanup_mutex
);
912 if (file
->ucontext
) {
913 ib_uverbs_cleanup_ucontext(file
, file
->ucontext
, false);
914 file
->ucontext
= NULL
;
916 mutex_unlock(&file
->cleanup_mutex
);
917 idr_destroy(&file
->idr
);
919 mutex_lock(&file
->device
->lists_mutex
);
920 if (!file
->is_closed
) {
921 list_del(&file
->list
);
924 mutex_unlock(&file
->device
->lists_mutex
);
926 if (file
->async_file
)
927 kref_put(&file
->async_file
->ref
,
928 ib_uverbs_release_async_event_file
);
930 kref_put(&file
->ref
, ib_uverbs_release_file
);
935 static const struct file_operations uverbs_fops
= {
936 .owner
= THIS_MODULE
,
937 .write
= ib_uverbs_write
,
938 .open
= ib_uverbs_open
,
939 .release
= ib_uverbs_close
,
941 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
942 .unlocked_ioctl
= ib_uverbs_ioctl
,
946 static const struct file_operations uverbs_mmap_fops
= {
947 .owner
= THIS_MODULE
,
948 .write
= ib_uverbs_write
,
949 .mmap
= ib_uverbs_mmap
,
950 .open
= ib_uverbs_open
,
951 .release
= ib_uverbs_close
,
953 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
954 .unlocked_ioctl
= ib_uverbs_ioctl
,
958 static struct ib_client uverbs_client
= {
960 .add
= ib_uverbs_add_one
,
961 .remove
= ib_uverbs_remove_one
964 static ssize_t
show_ibdev(struct device
*device
, struct device_attribute
*attr
,
969 struct ib_uverbs_device
*dev
= dev_get_drvdata(device
);
970 struct ib_device
*ib_dev
;
975 srcu_key
= srcu_read_lock(&dev
->disassociate_srcu
);
976 ib_dev
= srcu_dereference(dev
->ib_dev
, &dev
->disassociate_srcu
);
978 ret
= sprintf(buf
, "%s\n", ib_dev
->name
);
979 srcu_read_unlock(&dev
->disassociate_srcu
, srcu_key
);
983 static DEVICE_ATTR(ibdev
, S_IRUGO
, show_ibdev
, NULL
);
985 static ssize_t
show_dev_abi_version(struct device
*device
,
986 struct device_attribute
*attr
, char *buf
)
988 struct ib_uverbs_device
*dev
= dev_get_drvdata(device
);
991 struct ib_device
*ib_dev
;
995 srcu_key
= srcu_read_lock(&dev
->disassociate_srcu
);
996 ib_dev
= srcu_dereference(dev
->ib_dev
, &dev
->disassociate_srcu
);
998 ret
= sprintf(buf
, "%d\n", ib_dev
->uverbs_abi_ver
);
999 srcu_read_unlock(&dev
->disassociate_srcu
, srcu_key
);
1003 static DEVICE_ATTR(abi_version
, S_IRUGO
, show_dev_abi_version
, NULL
);
1005 static CLASS_ATTR_STRING(abi_version
, S_IRUGO
,
1006 __stringify(IB_USER_VERBS_ABI_VERSION
));
1008 static dev_t overflow_maj
;
1009 static DECLARE_BITMAP(overflow_map
, IB_UVERBS_MAX_DEVICES
);
1012 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1013 * requesting a new major number and doubling the number of max devices we
1014 * support. It's stupid, but simple.
1016 static int find_overflow_devnum(void)
1020 if (!overflow_maj
) {
1021 ret
= alloc_chrdev_region(&overflow_maj
, 0, IB_UVERBS_MAX_DEVICES
,
1022 "infiniband_verbs");
1024 pr_err("user_verbs: couldn't register dynamic device number\n");
1029 ret
= find_first_zero_bit(overflow_map
, IB_UVERBS_MAX_DEVICES
);
1030 if (ret
>= IB_UVERBS_MAX_DEVICES
)
1036 static void ib_uverbs_add_one(struct ib_device
*device
)
1040 struct ib_uverbs_device
*uverbs_dev
;
1043 if (!device
->alloc_ucontext
)
1046 uverbs_dev
= kzalloc(sizeof *uverbs_dev
, GFP_KERNEL
);
1050 ret
= init_srcu_struct(&uverbs_dev
->disassociate_srcu
);
1056 atomic_set(&uverbs_dev
->refcount
, 1);
1057 init_completion(&uverbs_dev
->comp
);
1058 uverbs_dev
->xrcd_tree
= RB_ROOT
;
1059 mutex_init(&uverbs_dev
->xrcd_tree_mutex
);
1060 kobject_init(&uverbs_dev
->kobj
, &ib_uverbs_dev_ktype
);
1061 mutex_init(&uverbs_dev
->lists_mutex
);
1062 INIT_LIST_HEAD(&uverbs_dev
->uverbs_file_list
);
1063 INIT_LIST_HEAD(&uverbs_dev
->uverbs_events_file_list
);
1065 spin_lock(&map_lock
);
1066 devnum
= find_first_zero_bit(dev_map
, IB_UVERBS_MAX_DEVICES
);
1067 if (devnum
>= IB_UVERBS_MAX_DEVICES
) {
1068 spin_unlock(&map_lock
);
1069 devnum
= find_overflow_devnum();
1073 spin_lock(&map_lock
);
1074 uverbs_dev
->devnum
= devnum
+ IB_UVERBS_MAX_DEVICES
;
1075 base
= devnum
+ overflow_maj
;
1076 set_bit(devnum
, overflow_map
);
1078 uverbs_dev
->devnum
= devnum
;
1079 base
= devnum
+ IB_UVERBS_BASE_DEV
;
1080 set_bit(devnum
, dev_map
);
1082 spin_unlock(&map_lock
);
1084 rcu_assign_pointer(uverbs_dev
->ib_dev
, device
);
1085 uverbs_dev
->num_comp_vectors
= device
->num_comp_vectors
;
1087 cdev_init(&uverbs_dev
->cdev
, NULL
);
1088 uverbs_dev
->cdev
.owner
= THIS_MODULE
;
1089 uverbs_dev
->cdev
.ops
= device
->mmap
? &uverbs_mmap_fops
: &uverbs_fops
;
1090 cdev_set_parent(&uverbs_dev
->cdev
, &uverbs_dev
->kobj
);
1091 kobject_set_name(&uverbs_dev
->cdev
.kobj
, "uverbs%d", uverbs_dev
->devnum
);
1092 if (cdev_add(&uverbs_dev
->cdev
, base
, 1))
1095 uverbs_dev
->dev
= device_create(uverbs_class
, device
->dev
.parent
,
1096 uverbs_dev
->cdev
.dev
, uverbs_dev
,
1097 "uverbs%d", uverbs_dev
->devnum
);
1098 if (IS_ERR(uverbs_dev
->dev
))
1101 if (device_create_file(uverbs_dev
->dev
, &dev_attr_ibdev
))
1103 if (device_create_file(uverbs_dev
->dev
, &dev_attr_abi_version
))
1106 if (!device
->specs_root
) {
1107 const struct uverbs_object_tree_def
*default_root
[] = {
1108 uverbs_default_get_objects()};
1110 uverbs_dev
->specs_root
= uverbs_alloc_spec_tree(1,
1112 if (IS_ERR(uverbs_dev
->specs_root
))
1115 device
->specs_root
= uverbs_dev
->specs_root
;
1118 ib_set_client_data(device
, &uverbs_client
, uverbs_dev
);
1123 device_destroy(uverbs_class
, uverbs_dev
->cdev
.dev
);
1126 cdev_del(&uverbs_dev
->cdev
);
1127 if (uverbs_dev
->devnum
< IB_UVERBS_MAX_DEVICES
)
1128 clear_bit(devnum
, dev_map
);
1130 clear_bit(devnum
, overflow_map
);
1133 if (atomic_dec_and_test(&uverbs_dev
->refcount
))
1134 ib_uverbs_comp_dev(uverbs_dev
);
1135 wait_for_completion(&uverbs_dev
->comp
);
1136 kobject_put(&uverbs_dev
->kobj
);
1140 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device
*uverbs_dev
,
1141 struct ib_device
*ib_dev
)
1143 struct ib_uverbs_file
*file
;
1144 struct ib_uverbs_async_event_file
*event_file
;
1145 struct ib_event event
;
1147 /* Pending running commands to terminate */
1148 synchronize_srcu(&uverbs_dev
->disassociate_srcu
);
1149 event
.event
= IB_EVENT_DEVICE_FATAL
;
1150 event
.element
.port_num
= 0;
1151 event
.device
= ib_dev
;
1153 mutex_lock(&uverbs_dev
->lists_mutex
);
1154 while (!list_empty(&uverbs_dev
->uverbs_file_list
)) {
1155 struct ib_ucontext
*ucontext
;
1156 file
= list_first_entry(&uverbs_dev
->uverbs_file_list
,
1157 struct ib_uverbs_file
, list
);
1158 file
->is_closed
= 1;
1159 list_del(&file
->list
);
1160 kref_get(&file
->ref
);
1161 mutex_unlock(&uverbs_dev
->lists_mutex
);
1164 mutex_lock(&file
->cleanup_mutex
);
1165 ucontext
= file
->ucontext
;
1166 file
->ucontext
= NULL
;
1167 mutex_unlock(&file
->cleanup_mutex
);
1169 /* At this point ib_uverbs_close cannot be running
1170 * ib_uverbs_cleanup_ucontext
1173 /* We must release the mutex before going ahead and
1174 * calling disassociate_ucontext. disassociate_ucontext
1175 * might end up indirectly calling uverbs_close,
1176 * for example due to freeing the resources
1179 ib_uverbs_event_handler(&file
->event_handler
, &event
);
1180 ib_dev
->disassociate_ucontext(ucontext
);
1181 mutex_lock(&file
->cleanup_mutex
);
1182 ib_uverbs_cleanup_ucontext(file
, ucontext
, true);
1183 mutex_unlock(&file
->cleanup_mutex
);
1186 mutex_lock(&uverbs_dev
->lists_mutex
);
1187 kref_put(&file
->ref
, ib_uverbs_release_file
);
1190 while (!list_empty(&uverbs_dev
->uverbs_events_file_list
)) {
1191 event_file
= list_first_entry(&uverbs_dev
->
1192 uverbs_events_file_list
,
1193 struct ib_uverbs_async_event_file
,
1195 spin_lock_irq(&event_file
->ev_queue
.lock
);
1196 event_file
->ev_queue
.is_closed
= 1;
1197 spin_unlock_irq(&event_file
->ev_queue
.lock
);
1199 list_del(&event_file
->list
);
1200 ib_unregister_event_handler(
1201 &event_file
->uverbs_file
->event_handler
);
1202 event_file
->uverbs_file
->event_handler
.device
=
1205 wake_up_interruptible(&event_file
->ev_queue
.poll_wait
);
1206 kill_fasync(&event_file
->ev_queue
.async_queue
, SIGIO
, POLL_IN
);
1208 mutex_unlock(&uverbs_dev
->lists_mutex
);
1211 static void ib_uverbs_remove_one(struct ib_device
*device
, void *client_data
)
1213 struct ib_uverbs_device
*uverbs_dev
= client_data
;
1214 int wait_clients
= 1;
1219 dev_set_drvdata(uverbs_dev
->dev
, NULL
);
1220 device_destroy(uverbs_class
, uverbs_dev
->cdev
.dev
);
1221 cdev_del(&uverbs_dev
->cdev
);
1223 if (uverbs_dev
->devnum
< IB_UVERBS_MAX_DEVICES
)
1224 clear_bit(uverbs_dev
->devnum
, dev_map
);
1226 clear_bit(uverbs_dev
->devnum
- IB_UVERBS_MAX_DEVICES
, overflow_map
);
1228 if (device
->disassociate_ucontext
) {
1229 /* We disassociate HW resources and immediately return.
1230 * Userspace will see a EIO errno for all future access.
1231 * Upon returning, ib_device may be freed internally and is not
1233 * uverbs_device is still available until all clients close
1234 * their files, then the uverbs device ref count will be zero
1235 * and its resources will be freed.
1236 * Note: At this point no more files can be opened since the
1237 * cdev was deleted, however active clients can still issue
1238 * commands and close their open files.
1240 rcu_assign_pointer(uverbs_dev
->ib_dev
, NULL
);
1241 ib_uverbs_free_hw_resources(uverbs_dev
, device
);
1245 if (atomic_dec_and_test(&uverbs_dev
->refcount
))
1246 ib_uverbs_comp_dev(uverbs_dev
);
1248 wait_for_completion(&uverbs_dev
->comp
);
1249 if (uverbs_dev
->specs_root
) {
1250 uverbs_free_spec_tree(uverbs_dev
->specs_root
);
1251 device
->specs_root
= NULL
;
1254 kobject_put(&uverbs_dev
->kobj
);
1257 static char *uverbs_devnode(struct device
*dev
, umode_t
*mode
)
1261 return kasprintf(GFP_KERNEL
, "infiniband/%s", dev_name(dev
));
1264 static int __init
ib_uverbs_init(void)
1268 ret
= register_chrdev_region(IB_UVERBS_BASE_DEV
, IB_UVERBS_MAX_DEVICES
,
1269 "infiniband_verbs");
1271 pr_err("user_verbs: couldn't register device number\n");
1275 uverbs_class
= class_create(THIS_MODULE
, "infiniband_verbs");
1276 if (IS_ERR(uverbs_class
)) {
1277 ret
= PTR_ERR(uverbs_class
);
1278 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1282 uverbs_class
->devnode
= uverbs_devnode
;
1284 ret
= class_create_file(uverbs_class
, &class_attr_abi_version
.attr
);
1286 pr_err("user_verbs: couldn't create abi_version attribute\n");
1290 ret
= ib_register_client(&uverbs_client
);
1292 pr_err("user_verbs: couldn't register client\n");
1299 class_destroy(uverbs_class
);
1302 unregister_chrdev_region(IB_UVERBS_BASE_DEV
, IB_UVERBS_MAX_DEVICES
);
1308 static void __exit
ib_uverbs_cleanup(void)
1310 ib_unregister_client(&uverbs_client
);
1311 class_destroy(uverbs_class
);
1312 unregister_chrdev_region(IB_UVERBS_BASE_DEV
, IB_UVERBS_MAX_DEVICES
);
1314 unregister_chrdev_region(overflow_maj
, IB_UVERBS_MAX_DEVICES
);
1317 module_init(ib_uverbs_init
);
1318 module_exit(ib_uverbs_cleanup
);