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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 <linux/uaccess.h>
50
51#include <rdma/ib.h>
52#include <rdma/uverbs_std_types.h>
53
54#include "uverbs.h"
55#include "core_priv.h"
56#include "rdma_core.h"
57
58MODULE_AUTHOR("Roland Dreier");
59MODULE_DESCRIPTION("InfiniBand userspace verbs access");
60MODULE_LICENSE("Dual BSD/GPL");
61
62enum {
63 IB_UVERBS_MAJOR = 231,
64 IB_UVERBS_BASE_MINOR = 192,
65 IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
66 IB_UVERBS_NUM_FIXED_MINOR = 32,
67 IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
68};
69
70#define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
71
72static dev_t dynamic_uverbs_dev;
73static struct class *uverbs_class;
74
75static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
76
77static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
78 const char __user *buf, int in_len,
79 int out_len) = {
80 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context,
81 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device,
82 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port,
83 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd,
84 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd,
85 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr,
86 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr,
87 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr,
88 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw,
89 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw,
90 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
91 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq,
92 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq,
93 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq,
94 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq,
95 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq,
96 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp,
97 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp,
98 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp,
99 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp,
100 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send,
101 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv,
102 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv,
103 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah,
104 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah,
105 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast,
106 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast,
107 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq,
108 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq,
109 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq,
110 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq,
111 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd,
112 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd,
113 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq,
114 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp,
115};
116
117static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
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,
132};
133
134static void ib_uverbs_add_one(struct ib_device *device);
135static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
136
137
138
139
140
141struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile)
142{
143
144
145
146
147
148 struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
149
150 if (!srcu_dereference(ufile->device->ib_dev,
151 &ufile->device->disassociate_srcu))
152 return ERR_PTR(-EIO);
153
154 if (!ucontext)
155 return ERR_PTR(-EINVAL);
156
157 return ucontext;
158}
159EXPORT_SYMBOL(ib_uverbs_get_ucontext);
160
161int uverbs_dealloc_mw(struct ib_mw *mw)
162{
163 struct ib_pd *pd = mw->pd;
164 int ret;
165
166 ret = mw->device->dealloc_mw(mw);
167 if (!ret)
168 atomic_dec(&pd->usecnt);
169 return ret;
170}
171
172static void ib_uverbs_release_dev(struct kobject *kobj)
173{
174 struct ib_uverbs_device *dev =
175 container_of(kobj, struct ib_uverbs_device, kobj);
176
177 uverbs_destroy_api(dev->uapi);
178 cleanup_srcu_struct(&dev->disassociate_srcu);
179 kfree(dev);
180}
181
182static struct kobj_type ib_uverbs_dev_ktype = {
183 .release = ib_uverbs_release_dev,
184};
185
186static void ib_uverbs_release_async_event_file(struct kref *ref)
187{
188 struct ib_uverbs_async_event_file *file =
189 container_of(ref, struct ib_uverbs_async_event_file, ref);
190
191 kfree(file);
192}
193
194void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
195 struct ib_uverbs_completion_event_file *ev_file,
196 struct ib_ucq_object *uobj)
197{
198 struct ib_uverbs_event *evt, *tmp;
199
200 if (ev_file) {
201 spin_lock_irq(&ev_file->ev_queue.lock);
202 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
203 list_del(&evt->list);
204 kfree(evt);
205 }
206 spin_unlock_irq(&ev_file->ev_queue.lock);
207
208 uverbs_uobject_put(&ev_file->uobj);
209 }
210
211 spin_lock_irq(&file->async_file->ev_queue.lock);
212 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
213 list_del(&evt->list);
214 kfree(evt);
215 }
216 spin_unlock_irq(&file->async_file->ev_queue.lock);
217}
218
219void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
220 struct ib_uevent_object *uobj)
221{
222 struct ib_uverbs_event *evt, *tmp;
223
224 spin_lock_irq(&file->async_file->ev_queue.lock);
225 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
226 list_del(&evt->list);
227 kfree(evt);
228 }
229 spin_unlock_irq(&file->async_file->ev_queue.lock);
230}
231
232void ib_uverbs_detach_umcast(struct ib_qp *qp,
233 struct ib_uqp_object *uobj)
234{
235 struct ib_uverbs_mcast_entry *mcast, *tmp;
236
237 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
238 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
239 list_del(&mcast->list);
240 kfree(mcast);
241 }
242}
243
244static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
245{
246 complete(&dev->comp);
247}
248
249void ib_uverbs_release_file(struct kref *ref)
250{
251 struct ib_uverbs_file *file =
252 container_of(ref, struct ib_uverbs_file, ref);
253 struct ib_device *ib_dev;
254 int srcu_key;
255
256 release_ufile_idr_uobject(file);
257
258 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
259 ib_dev = srcu_dereference(file->device->ib_dev,
260 &file->device->disassociate_srcu);
261 if (ib_dev && !ib_dev->disassociate_ucontext)
262 module_put(ib_dev->owner);
263 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
264
265 if (atomic_dec_and_test(&file->device->refcount))
266 ib_uverbs_comp_dev(file->device);
267
268 kobject_put(&file->device->kobj);
269 kfree(file);
270}
271
272static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
273 struct ib_uverbs_file *uverbs_file,
274 struct file *filp, char __user *buf,
275 size_t count, loff_t *pos,
276 size_t eventsz)
277{
278 struct ib_uverbs_event *event;
279 int ret = 0;
280
281 spin_lock_irq(&ev_queue->lock);
282
283 while (list_empty(&ev_queue->event_list)) {
284 spin_unlock_irq(&ev_queue->lock);
285
286 if (filp->f_flags & O_NONBLOCK)
287 return -EAGAIN;
288
289 if (wait_event_interruptible(ev_queue->poll_wait,
290 (!list_empty(&ev_queue->event_list) ||
291
292
293
294
295 !uverbs_file->device->ib_dev)))
296 return -ERESTARTSYS;
297
298
299 if (list_empty(&ev_queue->event_list) &&
300 !uverbs_file->device->ib_dev)
301 return -EIO;
302
303 spin_lock_irq(&ev_queue->lock);
304 }
305
306 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
307
308 if (eventsz > count) {
309 ret = -EINVAL;
310 event = NULL;
311 } else {
312 list_del(ev_queue->event_list.next);
313 if (event->counter) {
314 ++(*event->counter);
315 list_del(&event->obj_list);
316 }
317 }
318
319 spin_unlock_irq(&ev_queue->lock);
320
321 if (event) {
322 if (copy_to_user(buf, event, eventsz))
323 ret = -EFAULT;
324 else
325 ret = eventsz;
326 }
327
328 kfree(event);
329
330 return ret;
331}
332
333static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
334 size_t count, loff_t *pos)
335{
336 struct ib_uverbs_async_event_file *file = filp->private_data;
337
338 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
339 buf, count, pos,
340 sizeof(struct ib_uverbs_async_event_desc));
341}
342
343static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
344 size_t count, loff_t *pos)
345{
346 struct ib_uverbs_completion_event_file *comp_ev_file =
347 filp->private_data;
348
349 return ib_uverbs_event_read(&comp_ev_file->ev_queue,
350 comp_ev_file->uobj.ufile, filp,
351 buf, count, pos,
352 sizeof(struct ib_uverbs_comp_event_desc));
353}
354
355static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
356 struct file *filp,
357 struct poll_table_struct *wait)
358{
359 __poll_t pollflags = 0;
360
361 poll_wait(filp, &ev_queue->poll_wait, wait);
362
363 spin_lock_irq(&ev_queue->lock);
364 if (!list_empty(&ev_queue->event_list))
365 pollflags = EPOLLIN | EPOLLRDNORM;
366 spin_unlock_irq(&ev_queue->lock);
367
368 return pollflags;
369}
370
371static __poll_t ib_uverbs_async_event_poll(struct file *filp,
372 struct poll_table_struct *wait)
373{
374 return ib_uverbs_event_poll(filp->private_data, filp, wait);
375}
376
377static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
378 struct poll_table_struct *wait)
379{
380 struct ib_uverbs_completion_event_file *comp_ev_file =
381 filp->private_data;
382
383 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
384}
385
386static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
387{
388 struct ib_uverbs_event_queue *ev_queue = filp->private_data;
389
390 return fasync_helper(fd, filp, on, &ev_queue->async_queue);
391}
392
393static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
394{
395 struct ib_uverbs_completion_event_file *comp_ev_file =
396 filp->private_data;
397
398 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
399}
400
401static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
402{
403 struct ib_uverbs_async_event_file *file = filp->private_data;
404 struct ib_uverbs_file *uverbs_file = file->uverbs_file;
405 struct ib_uverbs_event *entry, *tmp;
406 int closed_already = 0;
407
408 mutex_lock(&uverbs_file->device->lists_mutex);
409 spin_lock_irq(&file->ev_queue.lock);
410 closed_already = file->ev_queue.is_closed;
411 file->ev_queue.is_closed = 1;
412 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
413 if (entry->counter)
414 list_del(&entry->obj_list);
415 kfree(entry);
416 }
417 spin_unlock_irq(&file->ev_queue.lock);
418 if (!closed_already) {
419 list_del(&file->list);
420 ib_unregister_event_handler(&uverbs_file->event_handler);
421 }
422 mutex_unlock(&uverbs_file->device->lists_mutex);
423
424 kref_put(&uverbs_file->ref, ib_uverbs_release_file);
425 kref_put(&file->ref, ib_uverbs_release_async_event_file);
426
427 return 0;
428}
429
430static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
431{
432 struct ib_uobject *uobj = filp->private_data;
433 struct ib_uverbs_completion_event_file *file = container_of(
434 uobj, struct ib_uverbs_completion_event_file, uobj);
435 struct ib_uverbs_event *entry, *tmp;
436
437 spin_lock_irq(&file->ev_queue.lock);
438 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
439 if (entry->counter)
440 list_del(&entry->obj_list);
441 kfree(entry);
442 }
443 file->ev_queue.is_closed = 1;
444 spin_unlock_irq(&file->ev_queue.lock);
445
446 uverbs_close_fd(filp);
447
448 return 0;
449}
450
451const struct file_operations uverbs_event_fops = {
452 .owner = THIS_MODULE,
453 .read = ib_uverbs_comp_event_read,
454 .poll = ib_uverbs_comp_event_poll,
455 .release = ib_uverbs_comp_event_close,
456 .fasync = ib_uverbs_comp_event_fasync,
457 .llseek = no_llseek,
458};
459
460static const struct file_operations uverbs_async_event_fops = {
461 .owner = THIS_MODULE,
462 .read = ib_uverbs_async_event_read,
463 .poll = ib_uverbs_async_event_poll,
464 .release = ib_uverbs_async_event_close,
465 .fasync = ib_uverbs_async_event_fasync,
466 .llseek = no_llseek,
467};
468
469void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
470{
471 struct ib_uverbs_event_queue *ev_queue = cq_context;
472 struct ib_ucq_object *uobj;
473 struct ib_uverbs_event *entry;
474 unsigned long flags;
475
476 if (!ev_queue)
477 return;
478
479 spin_lock_irqsave(&ev_queue->lock, flags);
480 if (ev_queue->is_closed) {
481 spin_unlock_irqrestore(&ev_queue->lock, flags);
482 return;
483 }
484
485 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
486 if (!entry) {
487 spin_unlock_irqrestore(&ev_queue->lock, flags);
488 return;
489 }
490
491 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
492
493 entry->desc.comp.cq_handle = cq->uobject->user_handle;
494 entry->counter = &uobj->comp_events_reported;
495
496 list_add_tail(&entry->list, &ev_queue->event_list);
497 list_add_tail(&entry->obj_list, &uobj->comp_list);
498 spin_unlock_irqrestore(&ev_queue->lock, flags);
499
500 wake_up_interruptible(&ev_queue->poll_wait);
501 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
502}
503
504static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
505 __u64 element, __u64 event,
506 struct list_head *obj_list,
507 u32 *counter)
508{
509 struct ib_uverbs_event *entry;
510 unsigned long flags;
511
512 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
513 if (file->async_file->ev_queue.is_closed) {
514 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
515 return;
516 }
517
518 entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
519 if (!entry) {
520 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
521 return;
522 }
523
524 entry->desc.async.element = element;
525 entry->desc.async.event_type = event;
526 entry->desc.async.reserved = 0;
527 entry->counter = counter;
528
529 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
530 if (obj_list)
531 list_add_tail(&entry->obj_list, obj_list);
532 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
533
534 wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
535 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
536}
537
538void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
539{
540 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
541 struct ib_ucq_object, uobject);
542
543 ib_uverbs_async_handler(uobj->uobject.ufile, uobj->uobject.user_handle,
544 event->event, &uobj->async_list,
545 &uobj->async_events_reported);
546}
547
548void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
549{
550 struct ib_uevent_object *uobj;
551
552
553 if (!event->element.qp->uobject)
554 return;
555
556 uobj = container_of(event->element.qp->uobject,
557 struct ib_uevent_object, uobject);
558
559 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
560 event->event, &uobj->event_list,
561 &uobj->events_reported);
562}
563
564void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
565{
566 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
567 struct ib_uevent_object, uobject);
568
569 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
570 event->event, &uobj->event_list,
571 &uobj->events_reported);
572}
573
574void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
575{
576 struct ib_uevent_object *uobj;
577
578 uobj = container_of(event->element.srq->uobject,
579 struct ib_uevent_object, uobject);
580
581 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
582 event->event, &uobj->event_list,
583 &uobj->events_reported);
584}
585
586void ib_uverbs_event_handler(struct ib_event_handler *handler,
587 struct ib_event *event)
588{
589 struct ib_uverbs_file *file =
590 container_of(handler, struct ib_uverbs_file, event_handler);
591
592 ib_uverbs_async_handler(file, event->element.port_num, event->event,
593 NULL, NULL);
594}
595
596void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
597{
598 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
599 file->async_file = NULL;
600}
601
602void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
603{
604 spin_lock_init(&ev_queue->lock);
605 INIT_LIST_HEAD(&ev_queue->event_list);
606 init_waitqueue_head(&ev_queue->poll_wait);
607 ev_queue->is_closed = 0;
608 ev_queue->async_queue = NULL;
609}
610
611struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
612 struct ib_device *ib_dev)
613{
614 struct ib_uverbs_async_event_file *ev_file;
615 struct file *filp;
616
617 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
618 if (!ev_file)
619 return ERR_PTR(-ENOMEM);
620
621 ib_uverbs_init_event_queue(&ev_file->ev_queue);
622 ev_file->uverbs_file = uverbs_file;
623 kref_get(&ev_file->uverbs_file->ref);
624 kref_init(&ev_file->ref);
625 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
626 ev_file, O_RDONLY);
627 if (IS_ERR(filp))
628 goto err_put_refs;
629
630 mutex_lock(&uverbs_file->device->lists_mutex);
631 list_add_tail(&ev_file->list,
632 &uverbs_file->device->uverbs_events_file_list);
633 mutex_unlock(&uverbs_file->device->lists_mutex);
634
635 WARN_ON(uverbs_file->async_file);
636 uverbs_file->async_file = ev_file;
637 kref_get(&uverbs_file->async_file->ref);
638 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
639 ib_dev,
640 ib_uverbs_event_handler);
641 ib_register_event_handler(&uverbs_file->event_handler);
642
643
644 return filp;
645
646err_put_refs:
647 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
648 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
649 return filp;
650}
651
652static bool verify_command_mask(struct ib_uverbs_file *ufile, u32 command,
653 bool extended)
654{
655 if (!extended)
656 return ufile->uverbs_cmd_mask & BIT_ULL(command);
657
658 return ufile->uverbs_ex_cmd_mask & BIT_ULL(command);
659}
660
661static bool verify_command_idx(u32 command, bool extended)
662{
663 if (extended)
664 return command < ARRAY_SIZE(uverbs_ex_cmd_table) &&
665 uverbs_ex_cmd_table[command];
666
667 return command < ARRAY_SIZE(uverbs_cmd_table) &&
668 uverbs_cmd_table[command];
669}
670
671static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr,
672 u32 *command, bool *extended)
673{
674 if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
675 IB_USER_VERBS_CMD_COMMAND_MASK))
676 return -EINVAL;
677
678 *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK;
679 *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED;
680
681 if (!verify_command_idx(*command, *extended))
682 return -EOPNOTSUPP;
683
684 return 0;
685}
686
687static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
688 struct ib_uverbs_ex_cmd_hdr *ex_hdr,
689 size_t count, bool extended)
690{
691 if (extended) {
692 count -= sizeof(*hdr) + sizeof(*ex_hdr);
693
694 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
695 return -EINVAL;
696
697 if (ex_hdr->cmd_hdr_reserved)
698 return -EINVAL;
699
700 if (ex_hdr->response) {
701 if (!hdr->out_words && !ex_hdr->provider_out_words)
702 return -EINVAL;
703
704 if (!access_ok(VERIFY_WRITE,
705 u64_to_user_ptr(ex_hdr->response),
706 (hdr->out_words + ex_hdr->provider_out_words) * 8))
707 return -EFAULT;
708 } else {
709 if (hdr->out_words || ex_hdr->provider_out_words)
710 return -EINVAL;
711 }
712
713 return 0;
714 }
715
716
717 if (hdr->in_words * 4 != count)
718 return -EINVAL;
719
720 return 0;
721}
722
723static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
724 size_t count, loff_t *pos)
725{
726 struct ib_uverbs_file *file = filp->private_data;
727 struct ib_uverbs_ex_cmd_hdr ex_hdr;
728 struct ib_uverbs_cmd_hdr hdr;
729 bool extended;
730 int srcu_key;
731 u32 command;
732 ssize_t ret;
733
734 if (!ib_safe_file_access(filp)) {
735 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
736 task_tgid_vnr(current), current->comm);
737 return -EACCES;
738 }
739
740 if (count < sizeof(hdr))
741 return -EINVAL;
742
743 if (copy_from_user(&hdr, buf, sizeof(hdr)))
744 return -EFAULT;
745
746 ret = process_hdr(&hdr, &command, &extended);
747 if (ret)
748 return ret;
749
750 if (extended) {
751 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
752 return -EINVAL;
753 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
754 return -EFAULT;
755 }
756
757 ret = verify_hdr(&hdr, &ex_hdr, count, extended);
758 if (ret)
759 return ret;
760
761 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
762
763 if (!verify_command_mask(file, command, extended)) {
764 ret = -EOPNOTSUPP;
765 goto out;
766 }
767
768 buf += sizeof(hdr);
769
770 if (!extended) {
771 ret = uverbs_cmd_table[command](file, buf,
772 hdr.in_words * 4,
773 hdr.out_words * 4);
774 } else {
775 struct ib_udata ucore;
776 struct ib_udata uhw;
777
778 buf += sizeof(ex_hdr);
779
780 ib_uverbs_init_udata_buf_or_null(&ucore, buf,
781 u64_to_user_ptr(ex_hdr.response),
782 hdr.in_words * 8, hdr.out_words * 8);
783
784 ib_uverbs_init_udata_buf_or_null(&uhw,
785 buf + ucore.inlen,
786 u64_to_user_ptr(ex_hdr.response) + ucore.outlen,
787 ex_hdr.provider_in_words * 8,
788 ex_hdr.provider_out_words * 8);
789
790 ret = uverbs_ex_cmd_table[command](file, &ucore, &uhw);
791 ret = (ret) ? : count;
792 }
793
794out:
795 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
796 return ret;
797}
798
799static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
800{
801 struct ib_uverbs_file *file = filp->private_data;
802 struct ib_ucontext *ucontext;
803 int ret = 0;
804 int srcu_key;
805
806 srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
807 ucontext = ib_uverbs_get_ucontext(file);
808 if (IS_ERR(ucontext)) {
809 ret = PTR_ERR(ucontext);
810 goto out;
811 }
812
813 ret = ucontext->device->mmap(ucontext, vma);
814out:
815 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
816 return ret;
817}
818
819
820
821
822
823
824
825
826
827
828
829static int ib_uverbs_open(struct inode *inode, struct file *filp)
830{
831 struct ib_uverbs_device *dev;
832 struct ib_uverbs_file *file;
833 struct ib_device *ib_dev;
834 int ret;
835 int module_dependent;
836 int srcu_key;
837
838 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
839 if (!atomic_inc_not_zero(&dev->refcount))
840 return -ENXIO;
841
842 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
843 mutex_lock(&dev->lists_mutex);
844 ib_dev = srcu_dereference(dev->ib_dev,
845 &dev->disassociate_srcu);
846 if (!ib_dev) {
847 ret = -EIO;
848 goto err;
849 }
850
851
852
853
854 module_dependent = !(ib_dev->disassociate_ucontext);
855
856 if (module_dependent) {
857 if (!try_module_get(ib_dev->owner)) {
858 ret = -ENODEV;
859 goto err;
860 }
861 }
862
863 file = kzalloc(sizeof(*file), GFP_KERNEL);
864 if (!file) {
865 ret = -ENOMEM;
866 if (module_dependent)
867 goto err_module;
868
869 goto err;
870 }
871
872 file->device = dev;
873 kref_init(&file->ref);
874 mutex_init(&file->ucontext_lock);
875
876 spin_lock_init(&file->uobjects_lock);
877 INIT_LIST_HEAD(&file->uobjects);
878 init_rwsem(&file->hw_destroy_rwsem);
879
880 filp->private_data = file;
881 kobject_get(&dev->kobj);
882 list_add_tail(&file->list, &dev->uverbs_file_list);
883 mutex_unlock(&dev->lists_mutex);
884 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
885
886 file->uverbs_cmd_mask = ib_dev->uverbs_cmd_mask;
887 file->uverbs_ex_cmd_mask = ib_dev->uverbs_ex_cmd_mask;
888
889 setup_ufile_idr_uobject(file);
890
891 return nonseekable_open(inode, filp);
892
893err_module:
894 module_put(ib_dev->owner);
895
896err:
897 mutex_unlock(&dev->lists_mutex);
898 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
899 if (atomic_dec_and_test(&dev->refcount))
900 ib_uverbs_comp_dev(dev);
901
902 return ret;
903}
904
905static int ib_uverbs_close(struct inode *inode, struct file *filp)
906{
907 struct ib_uverbs_file *file = filp->private_data;
908
909 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
910
911 mutex_lock(&file->device->lists_mutex);
912 if (!file->is_closed) {
913 list_del(&file->list);
914 file->is_closed = 1;
915 }
916 mutex_unlock(&file->device->lists_mutex);
917
918 if (file->async_file)
919 kref_put(&file->async_file->ref,
920 ib_uverbs_release_async_event_file);
921
922 kref_put(&file->ref, ib_uverbs_release_file);
923
924 return 0;
925}
926
927static const struct file_operations uverbs_fops = {
928 .owner = THIS_MODULE,
929 .write = ib_uverbs_write,
930 .open = ib_uverbs_open,
931 .release = ib_uverbs_close,
932 .llseek = no_llseek,
933 .unlocked_ioctl = ib_uverbs_ioctl,
934 .compat_ioctl = ib_uverbs_ioctl,
935};
936
937static const struct file_operations uverbs_mmap_fops = {
938 .owner = THIS_MODULE,
939 .write = ib_uverbs_write,
940 .mmap = ib_uverbs_mmap,
941 .open = ib_uverbs_open,
942 .release = ib_uverbs_close,
943 .llseek = no_llseek,
944 .unlocked_ioctl = ib_uverbs_ioctl,
945 .compat_ioctl = ib_uverbs_ioctl,
946};
947
948static struct ib_client uverbs_client = {
949 .name = "uverbs",
950 .add = ib_uverbs_add_one,
951 .remove = ib_uverbs_remove_one
952};
953
954static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
955 char *buf)
956{
957 int ret = -ENODEV;
958 int srcu_key;
959 struct ib_uverbs_device *dev = dev_get_drvdata(device);
960 struct ib_device *ib_dev;
961
962 if (!dev)
963 return -ENODEV;
964
965 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
966 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
967 if (ib_dev)
968 ret = sprintf(buf, "%s\n", ib_dev->name);
969 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
970
971 return ret;
972}
973static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
974
975static ssize_t show_dev_abi_version(struct device *device,
976 struct device_attribute *attr, char *buf)
977{
978 struct ib_uverbs_device *dev = dev_get_drvdata(device);
979 int ret = -ENODEV;
980 int srcu_key;
981 struct ib_device *ib_dev;
982
983 if (!dev)
984 return -ENODEV;
985 srcu_key = srcu_read_lock(&dev->disassociate_srcu);
986 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
987 if (ib_dev)
988 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
989 srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
990
991 return ret;
992}
993static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
994
995static CLASS_ATTR_STRING(abi_version, S_IRUGO,
996 __stringify(IB_USER_VERBS_ABI_VERSION));
997
998static int ib_uverbs_create_uapi(struct ib_device *device,
999 struct ib_uverbs_device *uverbs_dev)
1000{
1001 struct uverbs_api *uapi;
1002
1003 uapi = uverbs_alloc_api(device->driver_specs, device->driver_id);
1004 if (IS_ERR(uapi))
1005 return PTR_ERR(uapi);
1006
1007 uverbs_dev->uapi = uapi;
1008 return 0;
1009}
1010
1011static void ib_uverbs_add_one(struct ib_device *device)
1012{
1013 int devnum;
1014 dev_t base;
1015 struct ib_uverbs_device *uverbs_dev;
1016 int ret;
1017
1018 if (!device->alloc_ucontext)
1019 return;
1020
1021 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1022 if (!uverbs_dev)
1023 return;
1024
1025 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1026 if (ret) {
1027 kfree(uverbs_dev);
1028 return;
1029 }
1030
1031 atomic_set(&uverbs_dev->refcount, 1);
1032 init_completion(&uverbs_dev->comp);
1033 uverbs_dev->xrcd_tree = RB_ROOT;
1034 mutex_init(&uverbs_dev->xrcd_tree_mutex);
1035 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1036 mutex_init(&uverbs_dev->lists_mutex);
1037 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1038 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1039
1040 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1041 if (devnum >= IB_UVERBS_MAX_DEVICES)
1042 goto err;
1043 uverbs_dev->devnum = devnum;
1044 set_bit(devnum, dev_map);
1045 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1046 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1047 else
1048 base = IB_UVERBS_BASE_DEV + devnum;
1049
1050 rcu_assign_pointer(uverbs_dev->ib_dev, device);
1051 uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1052
1053 if (ib_uverbs_create_uapi(device, uverbs_dev))
1054 goto err_uapi;
1055
1056 cdev_init(&uverbs_dev->cdev, NULL);
1057 uverbs_dev->cdev.owner = THIS_MODULE;
1058 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1059 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1060 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1061 if (cdev_add(&uverbs_dev->cdev, base, 1))
1062 goto err_cdev;
1063
1064 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1065 uverbs_dev->cdev.dev, uverbs_dev,
1066 "uverbs%d", uverbs_dev->devnum);
1067 if (IS_ERR(uverbs_dev->dev))
1068 goto err_cdev;
1069
1070 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1071 goto err_class;
1072 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1073 goto err_class;
1074
1075 ib_set_client_data(device, &uverbs_client, uverbs_dev);
1076
1077 return;
1078
1079err_class:
1080 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1081err_cdev:
1082 cdev_del(&uverbs_dev->cdev);
1083err_uapi:
1084 clear_bit(devnum, dev_map);
1085err:
1086 if (atomic_dec_and_test(&uverbs_dev->refcount))
1087 ib_uverbs_comp_dev(uverbs_dev);
1088 wait_for_completion(&uverbs_dev->comp);
1089 kobject_put(&uverbs_dev->kobj);
1090 return;
1091}
1092
1093static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1094 struct ib_device *ib_dev)
1095{
1096 struct ib_uverbs_file *file;
1097 struct ib_uverbs_async_event_file *event_file;
1098 struct ib_event event;
1099
1100
1101 uverbs_disassociate_api_pre(uverbs_dev);
1102 event.event = IB_EVENT_DEVICE_FATAL;
1103 event.element.port_num = 0;
1104 event.device = ib_dev;
1105
1106 mutex_lock(&uverbs_dev->lists_mutex);
1107 while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1108 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1109 struct ib_uverbs_file, list);
1110 file->is_closed = 1;
1111 list_del(&file->list);
1112 kref_get(&file->ref);
1113
1114
1115
1116
1117
1118
1119 mutex_unlock(&uverbs_dev->lists_mutex);
1120
1121 ib_uverbs_event_handler(&file->event_handler, &event);
1122 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1123 kref_put(&file->ref, ib_uverbs_release_file);
1124
1125 mutex_lock(&uverbs_dev->lists_mutex);
1126 }
1127
1128 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1129 event_file = list_first_entry(&uverbs_dev->
1130 uverbs_events_file_list,
1131 struct ib_uverbs_async_event_file,
1132 list);
1133 spin_lock_irq(&event_file->ev_queue.lock);
1134 event_file->ev_queue.is_closed = 1;
1135 spin_unlock_irq(&event_file->ev_queue.lock);
1136
1137 list_del(&event_file->list);
1138 ib_unregister_event_handler(
1139 &event_file->uverbs_file->event_handler);
1140 event_file->uverbs_file->event_handler.device =
1141 NULL;
1142
1143 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1144 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1145 }
1146 mutex_unlock(&uverbs_dev->lists_mutex);
1147
1148 uverbs_disassociate_api(uverbs_dev->uapi);
1149}
1150
1151static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1152{
1153 struct ib_uverbs_device *uverbs_dev = client_data;
1154 int wait_clients = 1;
1155
1156 if (!uverbs_dev)
1157 return;
1158
1159 dev_set_drvdata(uverbs_dev->dev, NULL);
1160 device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1161 cdev_del(&uverbs_dev->cdev);
1162 clear_bit(uverbs_dev->devnum, dev_map);
1163
1164 if (device->disassociate_ucontext) {
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176 ib_uverbs_free_hw_resources(uverbs_dev, device);
1177 wait_clients = 0;
1178 }
1179
1180 if (atomic_dec_and_test(&uverbs_dev->refcount))
1181 ib_uverbs_comp_dev(uverbs_dev);
1182 if (wait_clients)
1183 wait_for_completion(&uverbs_dev->comp);
1184
1185 kobject_put(&uverbs_dev->kobj);
1186}
1187
1188static char *uverbs_devnode(struct device *dev, umode_t *mode)
1189{
1190 if (mode)
1191 *mode = 0666;
1192 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1193}
1194
1195static int __init ib_uverbs_init(void)
1196{
1197 int ret;
1198
1199 ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1200 IB_UVERBS_NUM_FIXED_MINOR,
1201 "infiniband_verbs");
1202 if (ret) {
1203 pr_err("user_verbs: couldn't register device number\n");
1204 goto out;
1205 }
1206
1207 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1208 IB_UVERBS_NUM_DYNAMIC_MINOR,
1209 "infiniband_verbs");
1210 if (ret) {
1211 pr_err("couldn't register dynamic device number\n");
1212 goto out_alloc;
1213 }
1214
1215 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1216 if (IS_ERR(uverbs_class)) {
1217 ret = PTR_ERR(uverbs_class);
1218 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1219 goto out_chrdev;
1220 }
1221
1222 uverbs_class->devnode = uverbs_devnode;
1223
1224 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1225 if (ret) {
1226 pr_err("user_verbs: couldn't create abi_version attribute\n");
1227 goto out_class;
1228 }
1229
1230 ret = ib_register_client(&uverbs_client);
1231 if (ret) {
1232 pr_err("user_verbs: couldn't register client\n");
1233 goto out_class;
1234 }
1235
1236 return 0;
1237
1238out_class:
1239 class_destroy(uverbs_class);
1240
1241out_chrdev:
1242 unregister_chrdev_region(dynamic_uverbs_dev,
1243 IB_UVERBS_NUM_DYNAMIC_MINOR);
1244
1245out_alloc:
1246 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1247 IB_UVERBS_NUM_FIXED_MINOR);
1248
1249out:
1250 return ret;
1251}
1252
1253static void __exit ib_uverbs_cleanup(void)
1254{
1255 ib_unregister_client(&uverbs_client);
1256 class_destroy(uverbs_class);
1257 unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1258 IB_UVERBS_NUM_FIXED_MINOR);
1259 unregister_chrdev_region(dynamic_uverbs_dev,
1260 IB_UVERBS_NUM_DYNAMIC_MINOR);
1261}
1262
1263module_init(ib_uverbs_init);
1264module_exit(ib_uverbs_cleanup);
1265