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 <asm/uaccess.h>
53 MODULE_AUTHOR("Roland Dreier");
54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55 MODULE_LICENSE("Dual BSD/GPL");
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,
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 [IB_USER_VERBS_CMD_CREATE_FLOW] = ib_uverbs_create_flow,
119 [IB_USER_VERBS_CMD_DESTROY_FLOW] = ib_uverbs_destroy_flow
122 static void ib_uverbs_add_one(struct ib_device *device);
123 static void ib_uverbs_remove_one(struct ib_device *device);
125 static void ib_uverbs_release_dev(struct kref *ref)
127 struct ib_uverbs_device *dev =
128 container_of(ref, struct ib_uverbs_device, ref);
130 complete(&dev->comp);
133 static void ib_uverbs_release_event_file(struct kref *ref)
135 struct ib_uverbs_event_file *file =
136 container_of(ref, struct ib_uverbs_event_file, ref);
141 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
142 struct ib_uverbs_event_file *ev_file,
143 struct ib_ucq_object *uobj)
145 struct ib_uverbs_event *evt, *tmp;
148 spin_lock_irq(&ev_file->lock);
149 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
150 list_del(&evt->list);
153 spin_unlock_irq(&ev_file->lock);
155 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
158 spin_lock_irq(&file->async_file->lock);
159 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
160 list_del(&evt->list);
163 spin_unlock_irq(&file->async_file->lock);
166 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
167 struct ib_uevent_object *uobj)
169 struct ib_uverbs_event *evt, *tmp;
171 spin_lock_irq(&file->async_file->lock);
172 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
173 list_del(&evt->list);
176 spin_unlock_irq(&file->async_file->lock);
179 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
180 struct ib_uqp_object *uobj)
182 struct ib_uverbs_mcast_entry *mcast, *tmp;
184 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
185 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
186 list_del(&mcast->list);
191 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
192 struct ib_ucontext *context)
194 struct ib_uobject *uobj, *tmp;
199 context->closing = 1;
201 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
202 struct ib_ah *ah = uobj->object;
204 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
209 /* Remove MWs before QPs, in order to support type 2A MWs. */
210 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
211 struct ib_mw *mw = uobj->object;
213 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
218 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
219 struct ib_flow *flow_id = uobj->object;
221 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
222 ib_destroy_flow(flow_id);
226 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
227 struct ib_qp *qp = uobj->object;
228 struct ib_uqp_object *uqp =
229 container_of(uobj, struct ib_uqp_object, uevent.uobject);
231 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
232 if (qp != qp->real_qp) {
235 ib_uverbs_detach_umcast(qp, uqp);
238 ib_uverbs_release_uevent(file, &uqp->uevent);
242 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
243 struct ib_cq *cq = uobj->object;
244 struct ib_uverbs_event_file *ev_file = cq->cq_context;
245 struct ib_ucq_object *ucq =
246 container_of(uobj, struct ib_ucq_object, uobject);
248 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
250 ib_uverbs_release_ucq(file, ev_file, ucq);
254 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
255 struct ib_srq *srq = uobj->object;
256 struct ib_uevent_object *uevent =
257 container_of(uobj, struct ib_uevent_object, uobject);
259 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
261 ib_uverbs_release_uevent(file, uevent);
265 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
266 struct ib_mr *mr = uobj->object;
268 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
273 mutex_lock(&file->device->xrcd_tree_mutex);
274 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
275 struct ib_xrcd *xrcd = uobj->object;
276 struct ib_uxrcd_object *uxrcd =
277 container_of(uobj, struct ib_uxrcd_object, uobject);
279 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
280 ib_uverbs_dealloc_xrcd(file->device, xrcd);
283 mutex_unlock(&file->device->xrcd_tree_mutex);
285 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
286 struct ib_pd *pd = uobj->object;
288 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
293 return context->device->dealloc_ucontext(context);
296 static void ib_uverbs_release_file(struct kref *ref)
298 struct ib_uverbs_file *file =
299 container_of(ref, struct ib_uverbs_file, ref);
301 module_put(file->device->ib_dev->owner);
302 kref_put(&file->device->ref, ib_uverbs_release_dev);
307 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
308 size_t count, loff_t *pos)
310 struct ib_uverbs_event_file *file = filp->private_data;
311 struct ib_uverbs_event *event;
315 spin_lock_irq(&file->lock);
317 while (list_empty(&file->event_list)) {
318 spin_unlock_irq(&file->lock);
320 if (filp->f_flags & O_NONBLOCK)
323 if (wait_event_interruptible(file->poll_wait,
324 !list_empty(&file->event_list)))
327 spin_lock_irq(&file->lock);
330 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
333 eventsz = sizeof (struct ib_uverbs_async_event_desc);
335 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
337 if (eventsz > count) {
341 list_del(file->event_list.next);
342 if (event->counter) {
344 list_del(&event->obj_list);
348 spin_unlock_irq(&file->lock);
351 if (copy_to_user(buf, event, eventsz))
362 static unsigned int ib_uverbs_event_poll(struct file *filp,
363 struct poll_table_struct *wait)
365 unsigned int pollflags = 0;
366 struct ib_uverbs_event_file *file = filp->private_data;
368 poll_wait(filp, &file->poll_wait, wait);
370 spin_lock_irq(&file->lock);
371 if (!list_empty(&file->event_list))
372 pollflags = POLLIN | POLLRDNORM;
373 spin_unlock_irq(&file->lock);
378 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
380 struct ib_uverbs_event_file *file = filp->private_data;
382 return fasync_helper(fd, filp, on, &file->async_queue);
385 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
387 struct ib_uverbs_event_file *file = filp->private_data;
388 struct ib_uverbs_event *entry, *tmp;
390 spin_lock_irq(&file->lock);
392 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
394 list_del(&entry->obj_list);
397 spin_unlock_irq(&file->lock);
399 if (file->is_async) {
400 ib_unregister_event_handler(&file->uverbs_file->event_handler);
401 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
403 kref_put(&file->ref, ib_uverbs_release_event_file);
408 static const struct file_operations uverbs_event_fops = {
409 .owner = THIS_MODULE,
410 .read = ib_uverbs_event_read,
411 .poll = ib_uverbs_event_poll,
412 .release = ib_uverbs_event_close,
413 .fasync = ib_uverbs_event_fasync,
417 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
419 struct ib_uverbs_event_file *file = cq_context;
420 struct ib_ucq_object *uobj;
421 struct ib_uverbs_event *entry;
427 spin_lock_irqsave(&file->lock, flags);
428 if (file->is_closed) {
429 spin_unlock_irqrestore(&file->lock, flags);
433 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
435 spin_unlock_irqrestore(&file->lock, flags);
439 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
441 entry->desc.comp.cq_handle = cq->uobject->user_handle;
442 entry->counter = &uobj->comp_events_reported;
444 list_add_tail(&entry->list, &file->event_list);
445 list_add_tail(&entry->obj_list, &uobj->comp_list);
446 spin_unlock_irqrestore(&file->lock, flags);
448 wake_up_interruptible(&file->poll_wait);
449 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
452 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
453 __u64 element, __u64 event,
454 struct list_head *obj_list,
457 struct ib_uverbs_event *entry;
460 spin_lock_irqsave(&file->async_file->lock, flags);
461 if (file->async_file->is_closed) {
462 spin_unlock_irqrestore(&file->async_file->lock, flags);
466 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
468 spin_unlock_irqrestore(&file->async_file->lock, flags);
472 entry->desc.async.element = element;
473 entry->desc.async.event_type = event;
474 entry->counter = counter;
476 list_add_tail(&entry->list, &file->async_file->event_list);
478 list_add_tail(&entry->obj_list, obj_list);
479 spin_unlock_irqrestore(&file->async_file->lock, flags);
481 wake_up_interruptible(&file->async_file->poll_wait);
482 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
485 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
487 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
488 struct ib_ucq_object, uobject);
490 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
491 event->event, &uobj->async_list,
492 &uobj->async_events_reported);
495 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
497 struct ib_uevent_object *uobj;
499 uobj = container_of(event->element.qp->uobject,
500 struct ib_uevent_object, uobject);
502 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
503 event->event, &uobj->event_list,
504 &uobj->events_reported);
507 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
509 struct ib_uevent_object *uobj;
511 uobj = container_of(event->element.srq->uobject,
512 struct ib_uevent_object, uobject);
514 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
515 event->event, &uobj->event_list,
516 &uobj->events_reported);
519 void ib_uverbs_event_handler(struct ib_event_handler *handler,
520 struct ib_event *event)
522 struct ib_uverbs_file *file =
523 container_of(handler, struct ib_uverbs_file, event_handler);
525 ib_uverbs_async_handler(file, event->element.port_num, event->event,
529 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
532 struct ib_uverbs_event_file *ev_file;
535 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
537 return ERR_PTR(-ENOMEM);
539 kref_init(&ev_file->ref);
540 spin_lock_init(&ev_file->lock);
541 INIT_LIST_HEAD(&ev_file->event_list);
542 init_waitqueue_head(&ev_file->poll_wait);
543 ev_file->uverbs_file = uverbs_file;
544 ev_file->async_queue = NULL;
545 ev_file->is_async = is_async;
546 ev_file->is_closed = 0;
548 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
557 * Look up a completion event file by FD. If lookup is successful,
558 * takes a ref to the event file struct that it returns; if
559 * unsuccessful, returns NULL.
561 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
563 struct ib_uverbs_event_file *ev_file = NULL;
564 struct fd f = fdget(fd);
569 if (f.file->f_op != &uverbs_event_fops)
572 ev_file = f.file->private_data;
573 if (ev_file->is_async) {
578 kref_get(&ev_file->ref);
585 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
586 size_t count, loff_t *pos)
588 struct ib_uverbs_file *file = filp->private_data;
589 struct ib_uverbs_cmd_hdr hdr;
591 if (count < sizeof hdr)
594 if (copy_from_user(&hdr, buf, sizeof hdr))
597 if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
598 !uverbs_cmd_table[hdr.command])
601 if (!file->ucontext &&
602 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
605 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
608 if (hdr.command >= IB_USER_VERBS_CMD_THRESHOLD) {
609 struct ib_uverbs_cmd_hdr_ex hdr_ex;
611 if (copy_from_user(&hdr_ex, buf, sizeof(hdr_ex)))
614 if (((hdr_ex.in_words + hdr_ex.provider_in_words) * 4) != count)
617 return uverbs_cmd_table[hdr.command](file,
618 buf + sizeof(hdr_ex),
620 hdr_ex.provider_in_words) * 4,
622 hdr_ex.provider_out_words) * 4);
624 if (hdr.in_words * 4 != count)
627 return uverbs_cmd_table[hdr.command](file,
634 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
636 struct ib_uverbs_file *file = filp->private_data;
641 return file->device->ib_dev->mmap(file->ucontext, vma);
645 * ib_uverbs_open() does not need the BKL:
647 * - the ib_uverbs_device structures are properly reference counted and
648 * everything else is purely local to the file being created, so
649 * races against other open calls are not a problem;
650 * - there is no ioctl method to race against;
651 * - the open method will either immediately run -ENXIO, or all
652 * required initialization will be done.
654 static int ib_uverbs_open(struct inode *inode, struct file *filp)
656 struct ib_uverbs_device *dev;
657 struct ib_uverbs_file *file;
660 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
666 if (!try_module_get(dev->ib_dev->owner)) {
671 file = kmalloc(sizeof *file, GFP_KERNEL);
678 file->ucontext = NULL;
679 file->async_file = NULL;
680 kref_init(&file->ref);
681 mutex_init(&file->mutex);
683 filp->private_data = file;
685 return nonseekable_open(inode, filp);
688 module_put(dev->ib_dev->owner);
691 kref_put(&dev->ref, ib_uverbs_release_dev);
695 static int ib_uverbs_close(struct inode *inode, struct file *filp)
697 struct ib_uverbs_file *file = filp->private_data;
699 ib_uverbs_cleanup_ucontext(file, file->ucontext);
701 if (file->async_file)
702 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
704 kref_put(&file->ref, ib_uverbs_release_file);
709 static const struct file_operations uverbs_fops = {
710 .owner = THIS_MODULE,
711 .write = ib_uverbs_write,
712 .open = ib_uverbs_open,
713 .release = ib_uverbs_close,
717 static const struct file_operations uverbs_mmap_fops = {
718 .owner = THIS_MODULE,
719 .write = ib_uverbs_write,
720 .mmap = ib_uverbs_mmap,
721 .open = ib_uverbs_open,
722 .release = ib_uverbs_close,
726 static struct ib_client uverbs_client = {
728 .add = ib_uverbs_add_one,
729 .remove = ib_uverbs_remove_one
732 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
735 struct ib_uverbs_device *dev = dev_get_drvdata(device);
740 return sprintf(buf, "%s\n", dev->ib_dev->name);
742 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
744 static ssize_t show_dev_abi_version(struct device *device,
745 struct device_attribute *attr, char *buf)
747 struct ib_uverbs_device *dev = dev_get_drvdata(device);
752 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
754 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
756 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
757 __stringify(IB_USER_VERBS_ABI_VERSION));
759 static dev_t overflow_maj;
760 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
763 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
764 * requesting a new major number and doubling the number of max devices we
765 * support. It's stupid, but simple.
767 static int find_overflow_devnum(void)
772 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
775 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
780 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
781 if (ret >= IB_UVERBS_MAX_DEVICES)
787 static void ib_uverbs_add_one(struct ib_device *device)
791 struct ib_uverbs_device *uverbs_dev;
793 if (!device->alloc_ucontext)
796 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
800 kref_init(&uverbs_dev->ref);
801 init_completion(&uverbs_dev->comp);
802 uverbs_dev->xrcd_tree = RB_ROOT;
803 mutex_init(&uverbs_dev->xrcd_tree_mutex);
805 spin_lock(&map_lock);
806 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
807 if (devnum >= IB_UVERBS_MAX_DEVICES) {
808 spin_unlock(&map_lock);
809 devnum = find_overflow_devnum();
813 spin_lock(&map_lock);
814 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
815 base = devnum + overflow_maj;
816 set_bit(devnum, overflow_map);
818 uverbs_dev->devnum = devnum;
819 base = devnum + IB_UVERBS_BASE_DEV;
820 set_bit(devnum, dev_map);
822 spin_unlock(&map_lock);
824 uverbs_dev->ib_dev = device;
825 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
827 cdev_init(&uverbs_dev->cdev, NULL);
828 uverbs_dev->cdev.owner = THIS_MODULE;
829 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
830 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
831 if (cdev_add(&uverbs_dev->cdev, base, 1))
834 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
835 uverbs_dev->cdev.dev, uverbs_dev,
836 "uverbs%d", uverbs_dev->devnum);
837 if (IS_ERR(uverbs_dev->dev))
840 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
842 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
845 ib_set_client_data(device, &uverbs_client, uverbs_dev);
850 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
853 cdev_del(&uverbs_dev->cdev);
854 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
855 clear_bit(devnum, dev_map);
857 clear_bit(devnum, overflow_map);
860 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
861 wait_for_completion(&uverbs_dev->comp);
866 static void ib_uverbs_remove_one(struct ib_device *device)
868 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
873 dev_set_drvdata(uverbs_dev->dev, NULL);
874 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
875 cdev_del(&uverbs_dev->cdev);
877 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
878 clear_bit(uverbs_dev->devnum, dev_map);
880 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
882 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
883 wait_for_completion(&uverbs_dev->comp);
887 static char *uverbs_devnode(struct device *dev, umode_t *mode)
891 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
894 static int __init ib_uverbs_init(void)
898 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
901 printk(KERN_ERR "user_verbs: couldn't register device number\n");
905 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
906 if (IS_ERR(uverbs_class)) {
907 ret = PTR_ERR(uverbs_class);
908 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
912 uverbs_class->devnode = uverbs_devnode;
914 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
916 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
920 ret = ib_register_client(&uverbs_client);
922 printk(KERN_ERR "user_verbs: couldn't register client\n");
929 class_destroy(uverbs_class);
932 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
938 static void __exit ib_uverbs_cleanup(void)
940 ib_unregister_client(&uverbs_client);
941 class_destroy(uverbs_class);
942 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
944 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
945 idr_destroy(&ib_uverbs_pd_idr);
946 idr_destroy(&ib_uverbs_mr_idr);
947 idr_destroy(&ib_uverbs_mw_idr);
948 idr_destroy(&ib_uverbs_ah_idr);
949 idr_destroy(&ib_uverbs_cq_idr);
950 idr_destroy(&ib_uverbs_qp_idr);
951 idr_destroy(&ib_uverbs_srq_idr);
954 module_init(ib_uverbs_init);
955 module_exit(ib_uverbs_cleanup);