drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   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:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  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.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  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 #include <linux/sched/mm.h>
  49
  50 #include <linux/uaccess.h>
  51
  52 #include <rdma/ib.h>
  53 #include <rdma/uverbs_std_types.h>
  54 #include <rdma/rdma_netlink.h>
  55
  56 #include "uverbs.h"
  57 #include "core_priv.h"
  58 #include "rdma_core.h"
  59
  60 MODULE_AUTHOR("Roland Dreier");
  61 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  62 MODULE_LICENSE("Dual BSD/GPL");
  63
  64 enum {
  65         IB_UVERBS_MAJOR       = 231,
  66         IB_UVERBS_BASE_MINOR  = 192,
  67         IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
  68         IB_UVERBS_NUM_FIXED_MINOR = 32,
  69         IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
  70 };
  71
  72 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  73
  74 static dev_t dynamic_uverbs_dev;
  75
  76 static DEFINE_IDA(uverbs_ida);
  77 static int ib_uverbs_add_one(struct ib_device *device);
  78 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
  79 static struct ib_client uverbs_client;
  80
  81 static char *uverbs_devnode(const struct device *dev, umode_t *mode)
  82 {
  83         if (mode)
  84                 *mode = 0666;
  85         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
  86 }
  87
  88 static const struct class uverbs_class = {
  89         .name = "infiniband_verbs",
  90         .devnode = uverbs_devnode,
  91 };
  92
  93 /*
  94  * Must be called with the ufile->device->disassociate_srcu held, and the lock
  95  * must be held until use of the ucontext is finished.
  96  */
  97 struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
  98 {
  99         /*
 100          * We do not hold the hw_destroy_rwsem lock for this flow, instead
 101          * srcu is used. It does not matter if someone races this with
 102          * get_context, we get NULL or valid ucontext.
 103          */
 104         struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
 105
 106         if (!srcu_dereference(ufile->device->ib_dev,
 107                               &ufile->device->disassociate_srcu))
 108                 return ERR_PTR(-EIO);
 109
 110         if (!ucontext)
 111                 return ERR_PTR(-EINVAL);
 112
 113         return ucontext;
 114 }
 115 EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
 116
 117 int uverbs_dealloc_mw(struct ib_mw *mw)
 118 {
 119         struct ib_pd *pd = mw->pd;
 120         int ret;
 121
 122         ret = mw->device->ops.dealloc_mw(mw);
 123         if (ret)
 124                 return ret;
 125
 126         atomic_dec(&pd->usecnt);
 127         kfree(mw);
 128         return ret;
 129 }
 130
 131 static void ib_uverbs_release_dev(struct device *device)
 132 {
 133         struct ib_uverbs_device *dev =
 134                         container_of(device, struct ib_uverbs_device, dev);
 135
 136         uverbs_destroy_api(dev->uapi);
 137         cleanup_srcu_struct(&dev->disassociate_srcu);
 138         mutex_destroy(&dev->lists_mutex);
 139         mutex_destroy(&dev->xrcd_tree_mutex);
 140         kfree(dev);
 141 }
 142
 143 void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
 144                            struct ib_ucq_object *uobj)
 145 {
 146         struct ib_uverbs_event *evt, *tmp;
 147
 148         if (ev_file) {
 149                 spin_lock_irq(&ev_file->ev_queue.lock);
 150                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 151                         list_del(&evt->list);
 152                         kfree(evt);
 153                 }
 154                 spin_unlock_irq(&ev_file->ev_queue.lock);
 155
 156                 uverbs_uobject_put(&ev_file->uobj);
 157         }
 158
 159         ib_uverbs_release_uevent(&uobj->uevent);
 160 }
 161
 162 void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
 163 {
 164         struct ib_uverbs_async_event_file *async_file = uobj->event_file;
 165         struct ib_uverbs_event *evt, *tmp;
 166
 167         if (!async_file)
 168                 return;
 169
 170         spin_lock_irq(&async_file->ev_queue.lock);
 171         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 172                 list_del(&evt->list);
 173                 kfree(evt);
 174         }
 175         spin_unlock_irq(&async_file->ev_queue.lock);
 176         uverbs_uobject_put(&async_file->uobj);
 177 }
 178
 179 void ib_uverbs_detach_umcast(struct ib_qp *qp,
 180                              struct ib_uqp_object *uobj)
 181 {
 182         struct ib_uverbs_mcast_entry *mcast, *tmp;
 183
 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);
 187                 kfree(mcast);
 188         }
 189 }
 190
 191 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 192 {
 193         complete(&dev->comp);
 194 }
 195
 196 void ib_uverbs_release_file(struct kref *ref)
 197 {
 198         struct ib_uverbs_file *file =
 199                 container_of(ref, struct ib_uverbs_file, ref);
 200         struct ib_device *ib_dev;
 201         int srcu_key;
 202
 203         release_ufile_idr_uobject(file);
 204
 205         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 206         ib_dev = srcu_dereference(file->device->ib_dev,
 207                                   &file->device->disassociate_srcu);
 208         if (ib_dev && !ib_dev->ops.disassociate_ucontext)
 209                 module_put(ib_dev->ops.owner);
 210         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 211
 212         if (refcount_dec_and_test(&file->device->refcount))
 213                 ib_uverbs_comp_dev(file->device);
 214
 215         if (file->default_async_file)
 216                 uverbs_uobject_put(&file->default_async_file->uobj);
 217         put_device(&file->device->dev);
 218
 219         if (file->disassociate_page)
 220                 __free_pages(file->disassociate_page, 0);
 221         mutex_destroy(&file->disassociation_lock);
 222         mutex_destroy(&file->umap_lock);
 223         mutex_destroy(&file->ucontext_lock);
 224         kfree(file);
 225 }
 226
 227 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 228                                     struct file *filp, char __user *buf,
 229                                     size_t count, loff_t *pos,
 230                                     size_t eventsz)
 231 {
 232         struct ib_uverbs_event *event;
 233         int ret = 0;
 234
 235         spin_lock_irq(&ev_queue->lock);
 236
 237         while (list_empty(&ev_queue->event_list)) {
 238                 if (ev_queue->is_closed) {
 239                         spin_unlock_irq(&ev_queue->lock);
 240                         return -EIO;
 241                 }
 242
 243                 spin_unlock_irq(&ev_queue->lock);
 244                 if (filp->f_flags & O_NONBLOCK)
 245                         return -EAGAIN;
 246
 247                 if (wait_event_interruptible(ev_queue->poll_wait,
 248                                              (!list_empty(&ev_queue->event_list) ||
 249                                               ev_queue->is_closed)))
 250                         return -ERESTARTSYS;
 251
 252                 spin_lock_irq(&ev_queue->lock);
 253         }
 254
 255         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 256
 257         if (eventsz > count) {
 258                 ret   = -EINVAL;
 259                 event = NULL;
 260         } else {
 261                 list_del(ev_queue->event_list.next);
 262                 if (event->counter) {
 263                         ++(*event->counter);
 264                         list_del(&event->obj_list);
 265                 }
 266         }
 267
 268         spin_unlock_irq(&ev_queue->lock);
 269
 270         if (event) {
 271                 if (copy_to_user(buf, event, eventsz))
 272                         ret = -EFAULT;
 273                 else
 274                         ret = eventsz;
 275         }
 276
 277         kfree(event);
 278
 279         return ret;
 280 }
 281
 282 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 283                                           size_t count, loff_t *pos)
 284 {
 285         struct ib_uverbs_async_event_file *file = filp->private_data;
 286
 287         return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
 288                                     sizeof(struct ib_uverbs_async_event_desc));
 289 }
 290
 291 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 292                                          size_t count, loff_t *pos)
 293 {
 294         struct ib_uverbs_completion_event_file *comp_ev_file =
 295                 filp->private_data;
 296
 297         return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
 298                                     pos,
 299                                     sizeof(struct ib_uverbs_comp_event_desc));
 300 }
 301
 302 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 303                                          struct file *filp,
 304                                          struct poll_table_struct *wait)
 305 {
 306         __poll_t pollflags = 0;
 307
 308         poll_wait(filp, &ev_queue->poll_wait, wait);
 309
 310         spin_lock_irq(&ev_queue->lock);
 311         if (!list_empty(&ev_queue->event_list))
 312                 pollflags = EPOLLIN | EPOLLRDNORM;
 313         else if (ev_queue->is_closed)
 314                 pollflags = EPOLLERR;
 315         spin_unlock_irq(&ev_queue->lock);
 316
 317         return pollflags;
 318 }
 319
 320 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 321                                                struct poll_table_struct *wait)
 322 {
 323         struct ib_uverbs_async_event_file *file = filp->private_data;
 324
 325         return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
 326 }
 327
 328 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 329                                               struct poll_table_struct *wait)
 330 {
 331         struct ib_uverbs_completion_event_file *comp_ev_file =
 332                 filp->private_data;
 333
 334         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 335 }
 336
 337 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 338 {
 339         struct ib_uverbs_async_event_file *file = filp->private_data;
 340
 341         return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
 342 }
 343
 344 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 345 {
 346         struct ib_uverbs_completion_event_file *comp_ev_file =
 347                 filp->private_data;
 348
 349         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 350 }
 351
 352 const struct file_operations uverbs_event_fops = {
 353         .owner   = THIS_MODULE,
 354         .read    = ib_uverbs_comp_event_read,
 355         .poll    = ib_uverbs_comp_event_poll,
 356         .release = uverbs_uobject_fd_release,
 357         .fasync  = ib_uverbs_comp_event_fasync,
 358 };
 359
 360 const struct file_operations uverbs_async_event_fops = {
 361         .owner   = THIS_MODULE,
 362         .read    = ib_uverbs_async_event_read,
 363         .poll    = ib_uverbs_async_event_poll,
 364         .release = uverbs_async_event_release,
 365         .fasync  = ib_uverbs_async_event_fasync,
 366 };
 367
 368 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 369 {
 370         struct ib_uverbs_event_queue   *ev_queue = cq_context;
 371         struct ib_ucq_object           *uobj;
 372         struct ib_uverbs_event         *entry;
 373         unsigned long                   flags;
 374
 375         if (!ev_queue)
 376                 return;
 377
 378         spin_lock_irqsave(&ev_queue->lock, flags);
 379         if (ev_queue->is_closed) {
 380                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 381                 return;
 382         }
 383
 384         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 385         if (!entry) {
 386                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 387                 return;
 388         }
 389
 390         uobj = cq->uobject;
 391
 392         entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle;
 393         entry->counter             = &uobj->comp_events_reported;
 394
 395         list_add_tail(&entry->list, &ev_queue->event_list);
 396         list_add_tail(&entry->obj_list, &uobj->comp_list);
 397         spin_unlock_irqrestore(&ev_queue->lock, flags);
 398
 399         wake_up_interruptible(&ev_queue->poll_wait);
 400         kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
 401 }
 402
 403 void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
 404                              __u64 element, __u64 event,
 405                              struct list_head *obj_list, u32 *counter)
 406 {
 407         struct ib_uverbs_event *entry;
 408         unsigned long flags;
 409
 410         if (!async_file)
 411                 return;
 412
 413         spin_lock_irqsave(&async_file->ev_queue.lock, flags);
 414         if (async_file->ev_queue.is_closed) {
 415                 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 416                 return;
 417         }
 418
 419         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 420         if (!entry) {
 421                 spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 422                 return;
 423         }
 424
 425         entry->desc.async.element = element;
 426         entry->desc.async.event_type = event;
 427         entry->desc.async.reserved = 0;
 428         entry->counter = counter;
 429
 430         list_add_tail(&entry->list, &async_file->ev_queue.event_list);
 431         if (obj_list)
 432                 list_add_tail(&entry->obj_list, obj_list);
 433         spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 434
 435         wake_up_interruptible(&async_file->ev_queue.poll_wait);
 436         kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN);
 437 }
 438
 439 static void uverbs_uobj_event(struct ib_uevent_object *eobj,
 440                               struct ib_event *event)
 441 {
 442         ib_uverbs_async_handler(eobj->event_file,
 443                                 eobj->uobject.user_handle, event->event,
 444                                 &eobj->event_list, &eobj->events_reported);
 445 }
 446
 447 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 448 {
 449         uverbs_uobj_event(&event->element.cq->uobject->uevent, event);
 450 }
 451
 452 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 453 {
 454         /* for XRC target qp's, check that qp is live */
 455         if (!event->element.qp->uobject)
 456                 return;
 457
 458         uverbs_uobj_event(&event->element.qp->uobject->uevent, event);
 459 }
 460
 461 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 462 {
 463         uverbs_uobj_event(&event->element.wq->uobject->uevent, event);
 464 }
 465
 466 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 467 {
 468         uverbs_uobj_event(&event->element.srq->uobject->uevent, event);
 469 }
 470
 471 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 472                                     struct ib_event *event)
 473 {
 474         ib_uverbs_async_handler(
 475                 container_of(handler, struct ib_uverbs_async_event_file,
 476                              event_handler),
 477                 event->element.port_num, event->event, NULL, NULL);
 478 }
 479
 480 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
 481 {
 482         spin_lock_init(&ev_queue->lock);
 483         INIT_LIST_HEAD(&ev_queue->event_list);
 484         init_waitqueue_head(&ev_queue->poll_wait);
 485         ev_queue->is_closed   = 0;
 486         ev_queue->async_queue = NULL;
 487 }
 488
 489 void ib_uverbs_init_async_event_file(
 490         struct ib_uverbs_async_event_file *async_file)
 491 {
 492         struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile;
 493         struct ib_device *ib_dev = async_file->uobj.context->device;
 494
 495         ib_uverbs_init_event_queue(&async_file->ev_queue);
 496
 497         /* The first async_event_file becomes the default one for the file. */
 498         mutex_lock(&uverbs_file->ucontext_lock);
 499         if (!uverbs_file->default_async_file) {
 500                 /* Pairs with the put in ib_uverbs_release_file */
 501                 uverbs_uobject_get(&async_file->uobj);
 502                 smp_store_release(&uverbs_file->default_async_file, async_file);
 503         }
 504         mutex_unlock(&uverbs_file->ucontext_lock);
 505
 506         INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev,
 507                               ib_uverbs_event_handler);
 508         ib_register_event_handler(&async_file->event_handler);
 509 }
 510
 511 static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
 512                           struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
 513                           const struct uverbs_api_write_method *method_elm)
 514 {
 515         if (method_elm->is_ex) {
 516                 count -= sizeof(*hdr) + sizeof(*ex_hdr);
 517
 518                 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
 519                         return -EINVAL;
 520
 521                 if (hdr->in_words * 8 < method_elm->req_size)
 522                         return -ENOSPC;
 523
 524                 if (ex_hdr->cmd_hdr_reserved)
 525                         return -EINVAL;
 526
 527                 if (ex_hdr->response) {
 528                         if (!hdr->out_words && !ex_hdr->provider_out_words)
 529                                 return -EINVAL;
 530
 531                         if (hdr->out_words * 8 < method_elm->resp_size)
 532                                 return -ENOSPC;
 533
 534                         if (!access_ok(u64_to_user_ptr(ex_hdr->response),
 535                                        (hdr->out_words + ex_hdr->provider_out_words) * 8))
 536                                 return -EFAULT;
 537                 } else {
 538                         if (hdr->out_words || ex_hdr->provider_out_words)
 539                                 return -EINVAL;
 540                 }
 541
 542                 return 0;
 543         }
 544
 545         /* not extended command */
 546         if (hdr->in_words * 4 != count)
 547                 return -EINVAL;
 548
 549         if (count < method_elm->req_size + sizeof(*hdr)) {
 550                 /*
 551                  * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
 552                  * with a 16 byte write instead of 24. Old kernels didn't
 553                  * check the size so they allowed this. Now that the size is
 554                  * checked provide a compatibility work around to not break
 555                  * those userspaces.
 556                  */
 557                 if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
 558                     count == 16) {
 559                         hdr->in_words = 6;
 560                         return 0;
 561                 }
 562                 return -ENOSPC;
 563         }
 564         if (hdr->out_words * 4 < method_elm->resp_size)
 565                 return -ENOSPC;
 566
 567         return 0;
 568 }
 569
 570 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 571                              size_t count, loff_t *pos)
 572 {
 573         struct ib_uverbs_file *file = filp->private_data;
 574         const struct uverbs_api_write_method *method_elm;
 575         struct uverbs_api *uapi = file->device->uapi;
 576         struct ib_uverbs_ex_cmd_hdr ex_hdr;
 577         struct ib_uverbs_cmd_hdr hdr;
 578         struct uverbs_attr_bundle bundle;
 579         int srcu_key;
 580         ssize_t ret;
 581
 582         if (!ib_safe_file_access(filp)) {
 583                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 584                             task_tgid_vnr(current), current->comm);
 585                 return -EACCES;
 586         }
 587
 588         if (count < sizeof(hdr))
 589                 return -EINVAL;
 590
 591         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 592                 return -EFAULT;
 593
 594         method_elm = uapi_get_method(uapi, hdr.command);
 595         if (IS_ERR(method_elm))
 596                 return PTR_ERR(method_elm);
 597
 598         if (method_elm->is_ex) {
 599                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
 600                         return -EINVAL;
 601                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
 602                         return -EFAULT;
 603         }
 604
 605         ret = verify_hdr(&hdr, &ex_hdr, count, method_elm);
 606         if (ret)
 607                 return ret;
 608
 609         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 610
 611         buf += sizeof(hdr);
 612
 613         memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
 614         bundle.ufile = file;
 615         bundle.context = NULL; /* only valid if bundle has uobject */
 616         bundle.uobject = NULL;
 617         if (!method_elm->is_ex) {
 618                 size_t in_len = hdr.in_words * 4 - sizeof(hdr);
 619                 size_t out_len = hdr.out_words * 4;
 620                 u64 response = 0;
 621
 622                 if (method_elm->has_udata) {
 623                         bundle.driver_udata.inlen =
 624                                 in_len - method_elm->req_size;
 625                         in_len = method_elm->req_size;
 626                         if (bundle.driver_udata.inlen)
 627                                 bundle.driver_udata.inbuf = buf + in_len;
 628                         else
 629                                 bundle.driver_udata.inbuf = NULL;
 630                 } else {
 631                         memset(&bundle.driver_udata, 0,
 632                                sizeof(bundle.driver_udata));
 633                 }
 634
 635                 if (method_elm->has_resp) {
 636                         /*
 637                          * The macros check that if has_resp is set
 638                          * then the command request structure starts
 639                          * with a '__aligned u64 response' member.
 640                          */
 641                         ret = get_user(response, (const u64 __user *)buf);
 642                         if (ret)
 643                                 goto out_unlock;
 644
 645                         if (method_elm->has_udata) {
 646                                 bundle.driver_udata.outlen =
 647                                         out_len - method_elm->resp_size;
 648                                 out_len = method_elm->resp_size;
 649                                 if (bundle.driver_udata.outlen)
 650                                         bundle.driver_udata.outbuf =
 651                                                 u64_to_user_ptr(response +
 652                                                                 out_len);
 653                                 else
 654                                         bundle.driver_udata.outbuf = NULL;
 655                         }
 656                 } else {
 657                         bundle.driver_udata.outlen = 0;
 658                         bundle.driver_udata.outbuf = NULL;
 659                 }
 660
 661                 ib_uverbs_init_udata_buf_or_null(
 662                         &bundle.ucore, buf, u64_to_user_ptr(response),
 663                         in_len, out_len);
 664         } else {
 665                 buf += sizeof(ex_hdr);
 666
 667                 ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
 668                                         u64_to_user_ptr(ex_hdr.response),
 669                                         hdr.in_words * 8, hdr.out_words * 8);
 670
 671                 ib_uverbs_init_udata_buf_or_null(
 672                         &bundle.driver_udata, buf + bundle.ucore.inlen,
 673                         u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
 674                         ex_hdr.provider_in_words * 8,
 675                         ex_hdr.provider_out_words * 8);
 676
 677         }
 678
 679         ret = method_elm->handler(&bundle);
 680         if (bundle.uobject)
 681                 uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true,
 682                                        !ret, &bundle);
 683 out_unlock:
 684         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 685         return (ret) ? : count;
 686 }
 687
 688 static const struct vm_operations_struct rdma_umap_ops;
 689
 690 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 691 {
 692         struct ib_uverbs_file *file = filp->private_data;
 693         struct ib_ucontext *ucontext;
 694         int ret = 0;
 695         int srcu_key;
 696
 697         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 698         ucontext = ib_uverbs_get_ucontext_file(file);
 699         if (IS_ERR(ucontext)) {
 700                 ret = PTR_ERR(ucontext);
 701                 goto out;
 702         }
 703
 704         mutex_lock(&file->disassociation_lock);
 705
 706         vma->vm_ops = &rdma_umap_ops;
 707         ret = ucontext->device->ops.mmap(ucontext, vma);
 708
 709         mutex_unlock(&file->disassociation_lock);
 710 out:
 711         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 712         return ret;
 713 }
 714
 715 /*
 716  * The VMA has been dup'd, initialize the vm_private_data with a new tracking
 717  * struct
 718  */
 719 static void rdma_umap_open(struct vm_area_struct *vma)
 720 {
 721         struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 722         struct rdma_umap_priv *opriv = vma->vm_private_data;
 723         struct rdma_umap_priv *priv;
 724
 725         if (!opriv)
 726                 return;
 727
 728         /* We are racing with disassociation */
 729         if (!down_read_trylock(&ufile->hw_destroy_rwsem))
 730                 goto out_zap;
 731         mutex_lock(&ufile->disassociation_lock);
 732
 733         /*
 734          * Disassociation already completed, the VMA should already be zapped.
 735          */
 736         if (!ufile->ucontext)
 737                 goto out_unlock;
 738
 739         priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 740         if (!priv)
 741                 goto out_unlock;
 742         rdma_umap_priv_init(priv, vma, opriv->entry);
 743
 744         mutex_unlock(&ufile->disassociation_lock);
 745         up_read(&ufile->hw_destroy_rwsem);
 746         return;
 747
 748 out_unlock:
 749         mutex_unlock(&ufile->disassociation_lock);
 750         up_read(&ufile->hw_destroy_rwsem);
 751 out_zap:
 752         /*
 753          * We can't allow the VMA to be created with the actual IO pages, that
 754          * would break our API contract, and it can't be stopped at this
 755          * point, so zap it.
 756          */
 757         vma->vm_private_data = NULL;
 758         zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
 759 }
 760
 761 static void rdma_umap_close(struct vm_area_struct *vma)
 762 {
 763         struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 764         struct rdma_umap_priv *priv = vma->vm_private_data;
 765
 766         if (!priv)
 767                 return;
 768
 769         /*
 770          * The vma holds a reference on the struct file that created it, which
 771          * in turn means that the ib_uverbs_file is guaranteed to exist at
 772          * this point.
 773          */
 774         mutex_lock(&ufile->umap_lock);
 775         if (priv->entry)
 776                 rdma_user_mmap_entry_put(priv->entry);
 777
 778         list_del(&priv->list);
 779         mutex_unlock(&ufile->umap_lock);
 780         kfree(priv);
 781 }
 782
 783 /*
 784  * Once the zap_vma_ptes has been called touches to the VMA will come here and
 785  * we return a dummy writable zero page for all the pfns.
 786  */
 787 static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
 788 {
 789         struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
 790         struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
 791         vm_fault_t ret = 0;
 792
 793         if (!priv)
 794                 return VM_FAULT_SIGBUS;
 795
 796         /* Read only pages can just use the system zero page. */
 797         if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
 798                 vmf->page = ZERO_PAGE(vmf->address);
 799                 get_page(vmf->page);
 800                 return 0;
 801         }
 802
 803         mutex_lock(&ufile->umap_lock);
 804         if (!ufile->disassociate_page)
 805                 ufile->disassociate_page =
 806                         alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
 807
 808         if (ufile->disassociate_page) {
 809                 /*
 810                  * This VMA is forced to always be shared so this doesn't have
 811                  * to worry about COW.
 812                  */
 813                 vmf->page = ufile->disassociate_page;
 814                 get_page(vmf->page);
 815         } else {
 816                 ret = VM_FAULT_SIGBUS;
 817         }
 818         mutex_unlock(&ufile->umap_lock);
 819
 820         return ret;
 821 }
 822
 823 static const struct vm_operations_struct rdma_umap_ops = {
 824         .open = rdma_umap_open,
 825         .close = rdma_umap_close,
 826         .fault = rdma_umap_fault,
 827 };
 828
 829 void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
 830 {
 831         struct rdma_umap_priv *priv, *next_priv;
 832
 833         mutex_lock(&ufile->disassociation_lock);
 834
 835         while (1) {
 836                 struct mm_struct *mm = NULL;
 837
 838                 /* Get an arbitrary mm pointer that hasn't been cleaned yet */
 839                 mutex_lock(&ufile->umap_lock);
 840                 while (!list_empty(&ufile->umaps)) {
 841                         int ret;
 842
 843                         priv = list_first_entry(&ufile->umaps,
 844                                                 struct rdma_umap_priv, list);
 845                         mm = priv->vma->vm_mm;
 846                         ret = mmget_not_zero(mm);
 847                         if (!ret) {
 848                                 list_del_init(&priv->list);
 849                                 if (priv->entry) {
 850                                         rdma_user_mmap_entry_put(priv->entry);
 851                                         priv->entry = NULL;
 852                                 }
 853                                 mm = NULL;
 854                                 continue;
 855                         }
 856                         break;
 857                 }
 858                 mutex_unlock(&ufile->umap_lock);
 859                 if (!mm) {
 860                         mutex_unlock(&ufile->disassociation_lock);
 861                         return;
 862                 }
 863
 864                 /*
 865                  * The umap_lock is nested under mmap_lock since it used within
 866                  * the vma_ops callbacks, so we have to clean the list one mm
 867                  * at a time to get the lock ordering right. Typically there
 868                  * will only be one mm, so no big deal.
 869                  */
 870                 mmap_read_lock(mm);
 871                 mutex_lock(&ufile->umap_lock);
 872                 list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
 873                                           list) {
 874                         struct vm_area_struct *vma = priv->vma;
 875
 876                         if (vma->vm_mm != mm)
 877                                 continue;
 878                         list_del_init(&priv->list);
 879
 880                         zap_vma_ptes(vma, vma->vm_start,
 881                                      vma->vm_end - vma->vm_start);
 882
 883                         if (priv->entry) {
 884                                 rdma_user_mmap_entry_put(priv->entry);
 885                                 priv->entry = NULL;
 886                         }
 887                 }
 888                 mutex_unlock(&ufile->umap_lock);
 889                 mmap_read_unlock(mm);
 890                 mmput(mm);
 891         }
 892
 893         mutex_unlock(&ufile->disassociation_lock);
 894 }
 895
 896 /**
 897  * rdma_user_mmap_disassociate() - Revoke mmaps for a device
 898  * @device: device to revoke
 899  *
 900  * This function should be called by drivers that need to disable mmaps for the
 901  * device, for instance because it is going to be reset.
 902  */
 903 void rdma_user_mmap_disassociate(struct ib_device *device)
 904 {
 905         struct ib_uverbs_device *uverbs_dev =
 906                 ib_get_client_data(device, &uverbs_client);
 907         struct ib_uverbs_file *ufile;
 908
 909         mutex_lock(&uverbs_dev->lists_mutex);
 910         list_for_each_entry(ufile, &uverbs_dev->uverbs_file_list, list) {
 911                 if (ufile->ucontext)
 912                         uverbs_user_mmap_disassociate(ufile);
 913         }
 914         mutex_unlock(&uverbs_dev->lists_mutex);
 915 }
 916 EXPORT_SYMBOL(rdma_user_mmap_disassociate);
 917
 918 /*
 919  * ib_uverbs_open() does not need the BKL:
 920  *
 921  *  - the ib_uverbs_device structures are properly reference counted and
 922  *    everything else is purely local to the file being created, so
 923  *    races against other open calls are not a problem;
 924  *  - there is no ioctl method to race against;
 925  *  - the open method will either immediately run -ENXIO, or all
 926  *    required initialization will be done.
 927  */
 928 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 929 {
 930         struct ib_uverbs_device *dev;
 931         struct ib_uverbs_file *file;
 932         struct ib_device *ib_dev;
 933         int ret;
 934         int module_dependent;
 935         int srcu_key;
 936
 937         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 938         if (!refcount_inc_not_zero(&dev->refcount))
 939                 return -ENXIO;
 940
 941         get_device(&dev->dev);
 942         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 943         mutex_lock(&dev->lists_mutex);
 944         ib_dev = srcu_dereference(dev->ib_dev,
 945                                   &dev->disassociate_srcu);
 946         if (!ib_dev) {
 947                 ret = -EIO;
 948                 goto err;
 949         }
 950
 951         if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
 952                 ret = -EPERM;
 953                 goto err;
 954         }
 955
 956         /* In case IB device supports disassociate ucontext, there is no hard
 957          * dependency between uverbs device and its low level device.
 958          */
 959         module_dependent = !(ib_dev->ops.disassociate_ucontext);
 960
 961         if (module_dependent) {
 962                 if (!try_module_get(ib_dev->ops.owner)) {
 963                         ret = -ENODEV;
 964                         goto err;
 965                 }
 966         }
 967
 968         file = kzalloc(sizeof(*file), GFP_KERNEL);
 969         if (!file) {
 970                 ret = -ENOMEM;
 971                 if (module_dependent)
 972                         goto err_module;
 973
 974                 goto err;
 975         }
 976
 977         file->device     = dev;
 978         kref_init(&file->ref);
 979         mutex_init(&file->ucontext_lock);
 980
 981         spin_lock_init(&file->uobjects_lock);
 982         INIT_LIST_HEAD(&file->uobjects);
 983         init_rwsem(&file->hw_destroy_rwsem);
 984         mutex_init(&file->umap_lock);
 985         INIT_LIST_HEAD(&file->umaps);
 986
 987         mutex_init(&file->disassociation_lock);
 988
 989         filp->private_data = file;
 990         list_add_tail(&file->list, &dev->uverbs_file_list);
 991         mutex_unlock(&dev->lists_mutex);
 992         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 993
 994         setup_ufile_idr_uobject(file);
 995
 996         return stream_open(inode, filp);
 997
 998 err_module:
 999         module_put(ib_dev->ops.owner);
1000
1001 err:
1002         mutex_unlock(&dev->lists_mutex);
1003         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1004         if (refcount_dec_and_test(&dev->refcount))
1005                 ib_uverbs_comp_dev(dev);
1006
1007         put_device(&dev->dev);
1008         return ret;
1009 }
1010
1011 static int ib_uverbs_close(struct inode *inode, struct file *filp)
1012 {
1013         struct ib_uverbs_file *file = filp->private_data;
1014
1015         uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
1016
1017         mutex_lock(&file->device->lists_mutex);
1018         list_del_init(&file->list);
1019         mutex_unlock(&file->device->lists_mutex);
1020
1021         kref_put(&file->ref, ib_uverbs_release_file);
1022
1023         return 0;
1024 }
1025
1026 static const struct file_operations uverbs_fops = {
1027         .owner   = THIS_MODULE,
1028         .write   = ib_uverbs_write,
1029         .open    = ib_uverbs_open,
1030         .release = ib_uverbs_close,
1031         .unlocked_ioctl = ib_uverbs_ioctl,
1032         .compat_ioctl = compat_ptr_ioctl,
1033 };
1034
1035 static const struct file_operations uverbs_mmap_fops = {
1036         .owner   = THIS_MODULE,
1037         .write   = ib_uverbs_write,
1038         .mmap    = ib_uverbs_mmap,
1039         .open    = ib_uverbs_open,
1040         .release = ib_uverbs_close,
1041         .unlocked_ioctl = ib_uverbs_ioctl,
1042         .compat_ioctl = compat_ptr_ioctl,
1043 };
1044
1045 static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1046                                  struct ib_client_nl_info *res)
1047 {
1048         struct ib_uverbs_device *uverbs_dev = client_data;
1049         int ret;
1050
1051         if (res->port != -1)
1052                 return -EINVAL;
1053
1054         res->abi = ibdev->ops.uverbs_abi_ver;
1055         res->cdev = &uverbs_dev->dev;
1056
1057         /*
1058          * To support DRIVER_ID binding in userspace some of the driver need
1059          * upgrading to expose their PCI dependent revision information
1060          * through get_context instead of relying on modalias matching. When
1061          * the drivers are fixed they can drop this flag.
1062          */
1063         if (!ibdev->ops.uverbs_no_driver_id_binding) {
1064                 ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1065                                   ibdev->ops.driver_id);
1066                 if (ret)
1067                         return ret;
1068         }
1069         return 0;
1070 }
1071
1072 static struct ib_client uverbs_client = {
1073         .name   = "uverbs",
1074         .no_kverbs_req = true,
1075         .add    = ib_uverbs_add_one,
1076         .remove = ib_uverbs_remove_one,
1077         .get_nl_info = ib_uverbs_get_nl_info,
1078 };
1079 MODULE_ALIAS_RDMA_CLIENT("uverbs");
1080
1081 static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1082                           char *buf)
1083 {
1084         struct ib_uverbs_device *dev =
1085                         container_of(device, struct ib_uverbs_device, dev);
1086         int ret = -ENODEV;
1087         int srcu_key;
1088         struct ib_device *ib_dev;
1089
1090         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1091         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1092         if (ib_dev)
1093                 ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev));
1094         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1095
1096         return ret;
1097 }
1098 static DEVICE_ATTR_RO(ibdev);
1099
1100 static ssize_t abi_version_show(struct device *device,
1101                                 struct device_attribute *attr, char *buf)
1102 {
1103         struct ib_uverbs_device *dev =
1104                         container_of(device, struct ib_uverbs_device, dev);
1105         int ret = -ENODEV;
1106         int srcu_key;
1107         struct ib_device *ib_dev;
1108
1109         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1110         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1111         if (ib_dev)
1112                 ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1113         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1114
1115         return ret;
1116 }
1117 static DEVICE_ATTR_RO(abi_version);
1118
1119 static struct attribute *ib_dev_attrs[] = {
1120         &dev_attr_abi_version.attr,
1121         &dev_attr_ibdev.attr,
1122         NULL,
1123 };
1124
1125 static const struct attribute_group dev_attr_group = {
1126         .attrs = ib_dev_attrs,
1127 };
1128
1129 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1130                          __stringify(IB_USER_VERBS_ABI_VERSION));
1131
1132 static int ib_uverbs_create_uapi(struct ib_device *device,
1133                                  struct ib_uverbs_device *uverbs_dev)
1134 {
1135         struct uverbs_api *uapi;
1136
1137         uapi = uverbs_alloc_api(device);
1138         if (IS_ERR(uapi))
1139                 return PTR_ERR(uapi);
1140
1141         uverbs_dev->uapi = uapi;
1142         return 0;
1143 }
1144
1145 static int ib_uverbs_add_one(struct ib_device *device)
1146 {
1147         int devnum;
1148         dev_t base;
1149         struct ib_uverbs_device *uverbs_dev;
1150         int ret;
1151
1152         if (!device->ops.alloc_ucontext ||
1153             device->type == RDMA_DEVICE_TYPE_SMI)
1154                 return -EOPNOTSUPP;
1155
1156         uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1157         if (!uverbs_dev)
1158                 return -ENOMEM;
1159
1160         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1161         if (ret) {
1162                 kfree(uverbs_dev);
1163                 return -ENOMEM;
1164         }
1165
1166         device_initialize(&uverbs_dev->dev);
1167         uverbs_dev->dev.class = &uverbs_class;
1168         uverbs_dev->dev.parent = device->dev.parent;
1169         uverbs_dev->dev.release = ib_uverbs_release_dev;
1170         uverbs_dev->groups[0] = &dev_attr_group;
1171         uverbs_dev->dev.groups = uverbs_dev->groups;
1172         refcount_set(&uverbs_dev->refcount, 1);
1173         init_completion(&uverbs_dev->comp);
1174         uverbs_dev->xrcd_tree = RB_ROOT;
1175         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1176         mutex_init(&uverbs_dev->lists_mutex);
1177         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1178         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1179         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1180
1181         devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1182                                GFP_KERNEL);
1183         if (devnum < 0) {
1184                 ret = -ENOMEM;
1185                 goto err;
1186         }
1187         uverbs_dev->devnum = devnum;
1188         if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1189                 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1190         else
1191                 base = IB_UVERBS_BASE_DEV + devnum;
1192
1193         ret = ib_uverbs_create_uapi(device, uverbs_dev);
1194         if (ret)
1195                 goto err_uapi;
1196
1197         uverbs_dev->dev.devt = base;
1198         dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1199
1200         cdev_init(&uverbs_dev->cdev,
1201                   device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1202         uverbs_dev->cdev.owner = THIS_MODULE;
1203
1204         ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1205         if (ret)
1206                 goto err_uapi;
1207
1208         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1209         return 0;
1210
1211 err_uapi:
1212         ida_free(&uverbs_ida, devnum);
1213 err:
1214         if (refcount_dec_and_test(&uverbs_dev->refcount))
1215                 ib_uverbs_comp_dev(uverbs_dev);
1216         wait_for_completion(&uverbs_dev->comp);
1217         put_device(&uverbs_dev->dev);
1218         return ret;
1219 }
1220
1221 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1222                                         struct ib_device *ib_dev)
1223 {
1224         struct ib_uverbs_file *file;
1225
1226         /* Pending running commands to terminate */
1227         uverbs_disassociate_api_pre(uverbs_dev);
1228
1229         mutex_lock(&uverbs_dev->lists_mutex);
1230         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1231                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1232                                         struct ib_uverbs_file, list);
1233                 list_del_init(&file->list);
1234                 kref_get(&file->ref);
1235
1236                 /* We must release the mutex before going ahead and calling
1237                  * uverbs_cleanup_ufile, as it might end up indirectly calling
1238                  * uverbs_close, for example due to freeing the resources (e.g
1239                  * mmput).
1240                  */
1241                 mutex_unlock(&uverbs_dev->lists_mutex);
1242
1243                 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1244                 kref_put(&file->ref, ib_uverbs_release_file);
1245
1246                 mutex_lock(&uverbs_dev->lists_mutex);
1247         }
1248         mutex_unlock(&uverbs_dev->lists_mutex);
1249
1250         uverbs_disassociate_api(uverbs_dev->uapi);
1251 }
1252
1253 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1254 {
1255         struct ib_uverbs_device *uverbs_dev = client_data;
1256         int wait_clients = 1;
1257
1258         cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1259         ida_free(&uverbs_ida, uverbs_dev->devnum);
1260
1261         if (device->ops.disassociate_ucontext) {
1262                 /* We disassociate HW resources and immediately return.
1263                  * Userspace will see a EIO errno for all future access.
1264                  * Upon returning, ib_device may be freed internally and is not
1265                  * valid any more.
1266                  * uverbs_device is still available until all clients close
1267                  * their files, then the uverbs device ref count will be zero
1268                  * and its resources will be freed.
1269                  * Note: At this point no more files can be opened since the
1270                  * cdev was deleted, however active clients can still issue
1271                  * commands and close their open files.
1272                  */
1273                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1274                 wait_clients = 0;
1275         }
1276
1277         if (refcount_dec_and_test(&uverbs_dev->refcount))
1278                 ib_uverbs_comp_dev(uverbs_dev);
1279         if (wait_clients)
1280                 wait_for_completion(&uverbs_dev->comp);
1281
1282         put_device(&uverbs_dev->dev);
1283 }
1284
1285 static int __init ib_uverbs_init(void)
1286 {
1287         int ret;
1288
1289         ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1290                                      IB_UVERBS_NUM_FIXED_MINOR,
1291                                      "infiniband_verbs");
1292         if (ret) {
1293                 pr_err("user_verbs: couldn't register device number\n");
1294                 goto out;
1295         }
1296
1297         ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1298                                   IB_UVERBS_NUM_DYNAMIC_MINOR,
1299                                   "infiniband_verbs");
1300         if (ret) {
1301                 pr_err("couldn't register dynamic device number\n");
1302                 goto out_alloc;
1303         }
1304
1305         ret = class_register(&uverbs_class);
1306         if (ret) {
1307                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1308                 goto out_chrdev;
1309         }
1310
1311         ret = class_create_file(&uverbs_class, &class_attr_abi_version.attr);
1312         if (ret) {
1313                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1314                 goto out_class;
1315         }
1316
1317         ret = ib_register_client(&uverbs_client);
1318         if (ret) {
1319                 pr_err("user_verbs: couldn't register client\n");
1320                 goto out_class;
1321         }
1322
1323         return 0;
1324
1325 out_class:
1326         class_unregister(&uverbs_class);
1327
1328 out_chrdev:
1329         unregister_chrdev_region(dynamic_uverbs_dev,
1330                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1331
1332 out_alloc:
1333         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1334                                  IB_UVERBS_NUM_FIXED_MINOR);
1335
1336 out:
1337         return ret;
1338 }
1339
1340 static void __exit ib_uverbs_cleanup(void)
1341 {
1342         ib_unregister_client(&uverbs_client);
1343         class_unregister(&uverbs_class);
1344         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1345                                  IB_UVERBS_NUM_FIXED_MINOR);
1346         unregister_chrdev_region(dynamic_uverbs_dev,
1347                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1348         mmu_notifier_synchronize();
1349 }
1350
1351 module_init(ib_uverbs_init);
1352 module_exit(ib_uverbs_cleanup);