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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
53MODULE_AUTHOR("Roland Dreier");
54MODULE_DESCRIPTION("InfiniBand userspace verbs access");
55MODULE_LICENSE("Dual BSD/GPL");
56
57enum {
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
65static struct class *uverbs_class;
66
67DEFINE_SPINLOCK(ib_uverbs_idr_lock);
68DEFINE_IDR(ib_uverbs_pd_idr);
69DEFINE_IDR(ib_uverbs_mr_idr);
70DEFINE_IDR(ib_uverbs_mw_idr);
71DEFINE_IDR(ib_uverbs_ah_idr);
72DEFINE_IDR(ib_uverbs_cq_idr);
73DEFINE_IDR(ib_uverbs_qp_idr);
74DEFINE_IDR(ib_uverbs_srq_idr);
75DEFINE_IDR(ib_uverbs_xrcd_idr);
76DEFINE_IDR(ib_uverbs_rule_idr);
77
78static DEFINE_SPINLOCK(map_lock);
79static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
80
81static 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,
119};
120
121static 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,
127};
128
129static void ib_uverbs_add_one(struct ib_device *device);
130static void ib_uverbs_remove_one(struct ib_device *device);
131
132static void ib_uverbs_release_dev(struct kref *ref)
133{
134 struct ib_uverbs_device *dev =
135 container_of(ref, struct ib_uverbs_device, ref);
136
137 complete(&dev->comp);
138}
139
140static void ib_uverbs_release_event_file(struct kref *ref)
141{
142 struct ib_uverbs_event_file *file =
143 container_of(ref, struct ib_uverbs_event_file, ref);
144
145 kfree(file);
146}
147
148void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
149 struct ib_uverbs_event_file *ev_file,
150 struct ib_ucq_object *uobj)
151{
152 struct ib_uverbs_event *evt, *tmp;
153
154 if (ev_file) {
155 spin_lock_irq(&ev_file->lock);
156 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
157 list_del(&evt->list);
158 kfree(evt);
159 }
160 spin_unlock_irq(&ev_file->lock);
161
162 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
163 }
164
165 spin_lock_irq(&file->async_file->lock);
166 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
167 list_del(&evt->list);
168 kfree(evt);
169 }
170 spin_unlock_irq(&file->async_file->lock);
171}
172
173void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
174 struct ib_uevent_object *uobj)
175{
176 struct ib_uverbs_event *evt, *tmp;
177
178 spin_lock_irq(&file->async_file->lock);
179 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
180 list_del(&evt->list);
181 kfree(evt);
182 }
183 spin_unlock_irq(&file->async_file->lock);
184}
185
186static void ib_uverbs_detach_umcast(struct ib_qp *qp,
187 struct ib_uqp_object *uobj)
188{
189 struct ib_uverbs_mcast_entry *mcast, *tmp;
190
191 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
192 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
193 list_del(&mcast->list);
194 kfree(mcast);
195 }
196}
197
198static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
199 struct ib_ucontext *context)
200{
201 struct ib_uobject *uobj, *tmp;
202
203 if (!context)
204 return 0;
205
206 context->closing = 1;
207
208 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
209 struct ib_ah *ah = uobj->object;
210
211 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
212 ib_destroy_ah(ah);
213 kfree(uobj);
214 }
215
216
217 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
218 struct ib_mw *mw = uobj->object;
219
220 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
221 ib_dealloc_mw(mw);
222 kfree(uobj);
223 }
224
225 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
226 struct ib_flow *flow_id = uobj->object;
227
228 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
229 ib_destroy_flow(flow_id);
230 kfree(uobj);
231 }
232
233 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
234 struct ib_qp *qp = uobj->object;
235 struct ib_uqp_object *uqp =
236 container_of(uobj, struct ib_uqp_object, uevent.uobject);
237
238 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
239 if (qp != qp->real_qp) {
240 ib_close_qp(qp);
241 } else {
242 ib_uverbs_detach_umcast(qp, uqp);
243 ib_destroy_qp(qp);
244 }
245 ib_uverbs_release_uevent(file, &uqp->uevent);
246 kfree(uqp);
247 }
248
249 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
250 struct ib_cq *cq = uobj->object;
251 struct ib_uverbs_event_file *ev_file = cq->cq_context;
252 struct ib_ucq_object *ucq =
253 container_of(uobj, struct ib_ucq_object, uobject);
254
255 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
256 ib_destroy_cq(cq);
257 ib_uverbs_release_ucq(file, ev_file, ucq);
258 kfree(ucq);
259 }
260
261 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
262 struct ib_srq *srq = uobj->object;
263 struct ib_uevent_object *uevent =
264 container_of(uobj, struct ib_uevent_object, uobject);
265
266 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
267 ib_destroy_srq(srq);
268 ib_uverbs_release_uevent(file, uevent);
269 kfree(uevent);
270 }
271
272 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
273 struct ib_mr *mr = uobj->object;
274
275 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
276 ib_dereg_mr(mr);
277 kfree(uobj);
278 }
279
280 mutex_lock(&file->device->xrcd_tree_mutex);
281 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
282 struct ib_xrcd *xrcd = uobj->object;
283 struct ib_uxrcd_object *uxrcd =
284 container_of(uobj, struct ib_uxrcd_object, uobject);
285
286 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
287 ib_uverbs_dealloc_xrcd(file->device, xrcd);
288 kfree(uxrcd);
289 }
290 mutex_unlock(&file->device->xrcd_tree_mutex);
291
292 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
293 struct ib_pd *pd = uobj->object;
294
295 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
296 ib_dealloc_pd(pd);
297 kfree(uobj);
298 }
299
300 put_pid(context->tgid);
301
302 return context->device->dealloc_ucontext(context);
303}
304
305static void ib_uverbs_release_file(struct kref *ref)
306{
307 struct ib_uverbs_file *file =
308 container_of(ref, struct ib_uverbs_file, ref);
309
310 module_put(file->device->ib_dev->owner);
311 kref_put(&file->device->ref, ib_uverbs_release_dev);
312
313 kfree(file);
314}
315
316static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
317 size_t count, loff_t *pos)
318{
319 struct ib_uverbs_event_file *file = filp->private_data;
320 struct ib_uverbs_event *event;
321 int eventsz;
322 int ret = 0;
323
324 spin_lock_irq(&file->lock);
325
326 while (list_empty(&file->event_list)) {
327 spin_unlock_irq(&file->lock);
328
329 if (filp->f_flags & O_NONBLOCK)
330 return -EAGAIN;
331
332 if (wait_event_interruptible(file->poll_wait,
333 !list_empty(&file->event_list)))
334 return -ERESTARTSYS;
335
336 spin_lock_irq(&file->lock);
337 }
338
339 event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
340
341 if (file->is_async)
342 eventsz = sizeof (struct ib_uverbs_async_event_desc);
343 else
344 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
345
346 if (eventsz > count) {
347 ret = -EINVAL;
348 event = NULL;
349 } else {
350 list_del(file->event_list.next);
351 if (event->counter) {
352 ++(*event->counter);
353 list_del(&event->obj_list);
354 }
355 }
356
357 spin_unlock_irq(&file->lock);
358
359 if (event) {
360 if (copy_to_user(buf, event, eventsz))
361 ret = -EFAULT;
362 else
363 ret = eventsz;
364 }
365
366 kfree(event);
367
368 return ret;
369}
370
371static unsigned int ib_uverbs_event_poll(struct file *filp,
372 struct poll_table_struct *wait)
373{
374 unsigned int pollflags = 0;
375 struct ib_uverbs_event_file *file = filp->private_data;
376
377 poll_wait(filp, &file->poll_wait, wait);
378
379 spin_lock_irq(&file->lock);
380 if (!list_empty(&file->event_list))
381 pollflags = POLLIN | POLLRDNORM;
382 spin_unlock_irq(&file->lock);
383
384 return pollflags;
385}
386
387static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
388{
389 struct ib_uverbs_event_file *file = filp->private_data;
390
391 return fasync_helper(fd, filp, on, &file->async_queue);
392}
393
394static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
395{
396 struct ib_uverbs_event_file *file = filp->private_data;
397 struct ib_uverbs_event *entry, *tmp;
398
399 spin_lock_irq(&file->lock);
400 file->is_closed = 1;
401 list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
402 if (entry->counter)
403 list_del(&entry->obj_list);
404 kfree(entry);
405 }
406 spin_unlock_irq(&file->lock);
407
408 if (file->is_async) {
409 ib_unregister_event_handler(&file->uverbs_file->event_handler);
410 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
411 }
412 kref_put(&file->ref, ib_uverbs_release_event_file);
413
414 return 0;
415}
416
417static const struct file_operations uverbs_event_fops = {
418 .owner = THIS_MODULE,
419 .read = ib_uverbs_event_read,
420 .poll = ib_uverbs_event_poll,
421 .release = ib_uverbs_event_close,
422 .fasync = ib_uverbs_event_fasync,
423 .llseek = no_llseek,
424};
425
426void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
427{
428 struct ib_uverbs_event_file *file = cq_context;
429 struct ib_ucq_object *uobj;
430 struct ib_uverbs_event *entry;
431 unsigned long flags;
432
433 if (!file)
434 return;
435
436 spin_lock_irqsave(&file->lock, flags);
437 if (file->is_closed) {
438 spin_unlock_irqrestore(&file->lock, flags);
439 return;
440 }
441
442 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
443 if (!entry) {
444 spin_unlock_irqrestore(&file->lock, flags);
445 return;
446 }
447
448 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
449
450 entry->desc.comp.cq_handle = cq->uobject->user_handle;
451 entry->counter = &uobj->comp_events_reported;
452
453 list_add_tail(&entry->list, &file->event_list);
454 list_add_tail(&entry->obj_list, &uobj->comp_list);
455 spin_unlock_irqrestore(&file->lock, flags);
456
457 wake_up_interruptible(&file->poll_wait);
458 kill_fasync(&file->async_queue, SIGIO, POLL_IN);
459}
460
461static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
462 __u64 element, __u64 event,
463 struct list_head *obj_list,
464 u32 *counter)
465{
466 struct ib_uverbs_event *entry;
467 unsigned long flags;
468
469 spin_lock_irqsave(&file->async_file->lock, flags);
470 if (file->async_file->is_closed) {
471 spin_unlock_irqrestore(&file->async_file->lock, flags);
472 return;
473 }
474
475 entry = kmalloc(sizeof *entry, GFP_ATOMIC);
476 if (!entry) {
477 spin_unlock_irqrestore(&file->async_file->lock, flags);
478 return;
479 }
480
481 entry->desc.async.element = element;
482 entry->desc.async.event_type = event;
483 entry->desc.async.reserved = 0;
484 entry->counter = counter;
485
486 list_add_tail(&entry->list, &file->async_file->event_list);
487 if (obj_list)
488 list_add_tail(&entry->obj_list, obj_list);
489 spin_unlock_irqrestore(&file->async_file->lock, flags);
490
491 wake_up_interruptible(&file->async_file->poll_wait);
492 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
493}
494
495void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
496{
497 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
498 struct ib_ucq_object, uobject);
499
500 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
501 event->event, &uobj->async_list,
502 &uobj->async_events_reported);
503}
504
505void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
506{
507 struct ib_uevent_object *uobj;
508
509
510 if (!event->element.qp->uobject || !event->element.qp->uobject->live)
511 return;
512
513 uobj = container_of(event->element.qp->uobject,
514 struct ib_uevent_object, uobject);
515
516 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
517 event->event, &uobj->event_list,
518 &uobj->events_reported);
519}
520
521void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
522{
523 struct ib_uevent_object *uobj;
524
525 uobj = container_of(event->element.srq->uobject,
526 struct ib_uevent_object, uobject);
527
528 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
529 event->event, &uobj->event_list,
530 &uobj->events_reported);
531}
532
533void ib_uverbs_event_handler(struct ib_event_handler *handler,
534 struct ib_event *event)
535{
536 struct ib_uverbs_file *file =
537 container_of(handler, struct ib_uverbs_file, event_handler);
538
539 ib_uverbs_async_handler(file, event->element.port_num, event->event,
540 NULL, NULL);
541}
542
543struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
544 int is_async)
545{
546 struct ib_uverbs_event_file *ev_file;
547 struct file *filp;
548
549 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
550 if (!ev_file)
551 return ERR_PTR(-ENOMEM);
552
553 kref_init(&ev_file->ref);
554 spin_lock_init(&ev_file->lock);
555 INIT_LIST_HEAD(&ev_file->event_list);
556 init_waitqueue_head(&ev_file->poll_wait);
557 ev_file->uverbs_file = uverbs_file;
558 ev_file->async_queue = NULL;
559 ev_file->is_async = is_async;
560 ev_file->is_closed = 0;
561
562 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
563 ev_file, O_RDONLY);
564 if (IS_ERR(filp))
565 kfree(ev_file);
566
567 return filp;
568}
569
570
571
572
573
574
575struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
576{
577 struct ib_uverbs_event_file *ev_file = NULL;
578 struct fd f = fdget(fd);
579
580 if (!f.file)
581 return NULL;
582
583 if (f.file->f_op != &uverbs_event_fops)
584 goto out;
585
586 ev_file = f.file->private_data;
587 if (ev_file->is_async) {
588 ev_file = NULL;
589 goto out;
590 }
591
592 kref_get(&ev_file->ref);
593
594out:
595 fdput(f);
596 return ev_file;
597}
598
599static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
600 size_t count, loff_t *pos)
601{
602 struct ib_uverbs_file *file = filp->private_data;
603 struct ib_uverbs_cmd_hdr hdr;
604 __u32 flags;
605
606 if (count < sizeof hdr)
607 return -EINVAL;
608
609 if (copy_from_user(&hdr, buf, sizeof hdr))
610 return -EFAULT;
611
612 flags = (hdr.command &
613 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
614
615 if (!flags) {
616 __u32 command;
617
618 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
619 IB_USER_VERBS_CMD_COMMAND_MASK))
620 return -EINVAL;
621
622 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
623
624 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
625 !uverbs_cmd_table[command])
626 return -EINVAL;
627
628 if (!file->ucontext &&
629 command != IB_USER_VERBS_CMD_GET_CONTEXT)
630 return -EINVAL;
631
632 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << command)))
633 return -ENOSYS;
634
635 if (hdr.in_words * 4 != count)
636 return -EINVAL;
637
638 return uverbs_cmd_table[command](file,
639 buf + sizeof(hdr),
640 hdr.in_words * 4,
641 hdr.out_words * 4);
642
643 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
644 __u32 command;
645
646 struct ib_uverbs_ex_cmd_hdr ex_hdr;
647 struct ib_udata ucore;
648 struct ib_udata uhw;
649 int err;
650 size_t written_count = count;
651
652 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
653 IB_USER_VERBS_CMD_COMMAND_MASK))
654 return -EINVAL;
655
656 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
657
658 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
659 !uverbs_ex_cmd_table[command])
660 return -ENOSYS;
661
662 if (!file->ucontext)
663 return -EINVAL;
664
665 if (!(file->device->ib_dev->uverbs_ex_cmd_mask & (1ull << command)))
666 return -ENOSYS;
667
668 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
669 return -EINVAL;
670
671 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
672 return -EFAULT;
673
674 count -= sizeof(hdr) + sizeof(ex_hdr);
675 buf += sizeof(hdr) + sizeof(ex_hdr);
676
677 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count)
678 return -EINVAL;
679
680 if (ex_hdr.cmd_hdr_reserved)
681 return -EINVAL;
682
683 if (ex_hdr.response) {
684 if (!hdr.out_words && !ex_hdr.provider_out_words)
685 return -EINVAL;
686
687 if (!access_ok(VERIFY_WRITE,
688 (void __user *) (unsigned long) ex_hdr.response,
689 (hdr.out_words + ex_hdr.provider_out_words) * 8))
690 return -EFAULT;
691 } else {
692 if (hdr.out_words || ex_hdr.provider_out_words)
693 return -EINVAL;
694 }
695
696 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
697 hdr.in_words * 8, hdr.out_words * 8);
698
699 INIT_UDATA_BUF_OR_NULL(&uhw,
700 buf + ucore.inlen,
701 (unsigned long) ex_hdr.response + ucore.outlen,
702 ex_hdr.provider_in_words * 8,
703 ex_hdr.provider_out_words * 8);
704
705 err = uverbs_ex_cmd_table[command](file,
706 &ucore,
707 &uhw);
708
709 if (err)
710 return err;
711
712 return written_count;
713 }
714
715 return -ENOSYS;
716}
717
718static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
719{
720 struct ib_uverbs_file *file = filp->private_data;
721
722 if (!file->ucontext)
723 return -ENODEV;
724 else
725 return file->device->ib_dev->mmap(file->ucontext, vma);
726}
727
728
729
730
731
732
733
734
735
736
737
738static int ib_uverbs_open(struct inode *inode, struct file *filp)
739{
740 struct ib_uverbs_device *dev;
741 struct ib_uverbs_file *file;
742 int ret;
743
744 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
745 if (dev)
746 kref_get(&dev->ref);
747 else
748 return -ENXIO;
749
750 if (!try_module_get(dev->ib_dev->owner)) {
751 ret = -ENODEV;
752 goto err;
753 }
754
755 file = kmalloc(sizeof *file, GFP_KERNEL);
756 if (!file) {
757 ret = -ENOMEM;
758 goto err_module;
759 }
760
761 file->device = dev;
762 file->ucontext = NULL;
763 file->async_file = NULL;
764 kref_init(&file->ref);
765 mutex_init(&file->mutex);
766
767 filp->private_data = file;
768
769 return nonseekable_open(inode, filp);
770
771err_module:
772 module_put(dev->ib_dev->owner);
773
774err:
775 kref_put(&dev->ref, ib_uverbs_release_dev);
776 return ret;
777}
778
779static int ib_uverbs_close(struct inode *inode, struct file *filp)
780{
781 struct ib_uverbs_file *file = filp->private_data;
782
783 ib_uverbs_cleanup_ucontext(file, file->ucontext);
784
785 if (file->async_file)
786 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
787
788 kref_put(&file->ref, ib_uverbs_release_file);
789
790 return 0;
791}
792
793static const struct file_operations uverbs_fops = {
794 .owner = THIS_MODULE,
795 .write = ib_uverbs_write,
796 .open = ib_uverbs_open,
797 .release = ib_uverbs_close,
798 .llseek = no_llseek,
799};
800
801static const struct file_operations uverbs_mmap_fops = {
802 .owner = THIS_MODULE,
803 .write = ib_uverbs_write,
804 .mmap = ib_uverbs_mmap,
805 .open = ib_uverbs_open,
806 .release = ib_uverbs_close,
807 .llseek = no_llseek,
808};
809
810static struct ib_client uverbs_client = {
811 .name = "uverbs",
812 .add = ib_uverbs_add_one,
813 .remove = ib_uverbs_remove_one
814};
815
816static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
817 char *buf)
818{
819 struct ib_uverbs_device *dev = dev_get_drvdata(device);
820
821 if (!dev)
822 return -ENODEV;
823
824 return sprintf(buf, "%s\n", dev->ib_dev->name);
825}
826static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
827
828static ssize_t show_dev_abi_version(struct device *device,
829 struct device_attribute *attr, char *buf)
830{
831 struct ib_uverbs_device *dev = dev_get_drvdata(device);
832
833 if (!dev)
834 return -ENODEV;
835
836 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
837}
838static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
839
840static CLASS_ATTR_STRING(abi_version, S_IRUGO,
841 __stringify(IB_USER_VERBS_ABI_VERSION));
842
843static dev_t overflow_maj;
844static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
845
846
847
848
849
850
851static int find_overflow_devnum(void)
852{
853 int ret;
854
855 if (!overflow_maj) {
856 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
857 "infiniband_verbs");
858 if (ret) {
859 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
860 return ret;
861 }
862 }
863
864 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
865 if (ret >= IB_UVERBS_MAX_DEVICES)
866 return -1;
867
868 return ret;
869}
870
871static void ib_uverbs_add_one(struct ib_device *device)
872{
873 int devnum;
874 dev_t base;
875 struct ib_uverbs_device *uverbs_dev;
876
877 if (!device->alloc_ucontext)
878 return;
879
880 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
881 if (!uverbs_dev)
882 return;
883
884 kref_init(&uverbs_dev->ref);
885 init_completion(&uverbs_dev->comp);
886 uverbs_dev->xrcd_tree = RB_ROOT;
887 mutex_init(&uverbs_dev->xrcd_tree_mutex);
888
889 spin_lock(&map_lock);
890 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
891 if (devnum >= IB_UVERBS_MAX_DEVICES) {
892 spin_unlock(&map_lock);
893 devnum = find_overflow_devnum();
894 if (devnum < 0)
895 goto err;
896
897 spin_lock(&map_lock);
898 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
899 base = devnum + overflow_maj;
900 set_bit(devnum, overflow_map);
901 } else {
902 uverbs_dev->devnum = devnum;
903 base = devnum + IB_UVERBS_BASE_DEV;
904 set_bit(devnum, dev_map);
905 }
906 spin_unlock(&map_lock);
907
908 uverbs_dev->ib_dev = device;
909 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
910
911 cdev_init(&uverbs_dev->cdev, NULL);
912 uverbs_dev->cdev.owner = THIS_MODULE;
913 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
914 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
915 if (cdev_add(&uverbs_dev->cdev, base, 1))
916 goto err_cdev;
917
918 uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
919 uverbs_dev->cdev.dev, uverbs_dev,
920 "uverbs%d", uverbs_dev->devnum);
921 if (IS_ERR(uverbs_dev->dev))
922 goto err_cdev;
923
924 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
925 goto err_class;
926 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
927 goto err_class;
928
929 ib_set_client_data(device, &uverbs_client, uverbs_dev);
930
931 return;
932
933err_class:
934 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
935
936err_cdev:
937 cdev_del(&uverbs_dev->cdev);
938 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
939 clear_bit(devnum, dev_map);
940 else
941 clear_bit(devnum, overflow_map);
942
943err:
944 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
945 wait_for_completion(&uverbs_dev->comp);
946 kfree(uverbs_dev);
947 return;
948}
949
950static void ib_uverbs_remove_one(struct ib_device *device)
951{
952 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
953
954 if (!uverbs_dev)
955 return;
956
957 dev_set_drvdata(uverbs_dev->dev, NULL);
958 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
959 cdev_del(&uverbs_dev->cdev);
960
961 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
962 clear_bit(uverbs_dev->devnum, dev_map);
963 else
964 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
965
966 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
967 wait_for_completion(&uverbs_dev->comp);
968 kfree(uverbs_dev);
969}
970
971static char *uverbs_devnode(struct device *dev, umode_t *mode)
972{
973 if (mode)
974 *mode = 0666;
975 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
976}
977
978static int __init ib_uverbs_init(void)
979{
980 int ret;
981
982 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
983 "infiniband_verbs");
984 if (ret) {
985 printk(KERN_ERR "user_verbs: couldn't register device number\n");
986 goto out;
987 }
988
989 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
990 if (IS_ERR(uverbs_class)) {
991 ret = PTR_ERR(uverbs_class);
992 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
993 goto out_chrdev;
994 }
995
996 uverbs_class->devnode = uverbs_devnode;
997
998 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
999 if (ret) {
1000 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1001 goto out_class;
1002 }
1003
1004 ret = ib_register_client(&uverbs_client);
1005 if (ret) {
1006 printk(KERN_ERR "user_verbs: couldn't register client\n");
1007 goto out_class;
1008 }
1009
1010 return 0;
1011
1012out_class:
1013 class_destroy(uverbs_class);
1014
1015out_chrdev:
1016 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1017
1018out:
1019 return ret;
1020}
1021
1022static void __exit ib_uverbs_cleanup(void)
1023{
1024 ib_unregister_client(&uverbs_client);
1025 class_destroy(uverbs_class);
1026 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1027 if (overflow_maj)
1028 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1029 idr_destroy(&ib_uverbs_pd_idr);
1030 idr_destroy(&ib_uverbs_mr_idr);
1031 idr_destroy(&ib_uverbs_mw_idr);
1032 idr_destroy(&ib_uverbs_ah_idr);
1033 idr_destroy(&ib_uverbs_cq_idr);
1034 idr_destroy(&ib_uverbs_qp_idr);
1035 idr_destroy(&ib_uverbs_srq_idr);
1036}
1037
1038module_init(ib_uverbs_init);
1039module_exit(ib_uverbs_cleanup);
1040
