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
  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
  58 MODULE_AUTHOR("Roland Dreier");
  59 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 enum {
  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
  72 static dev_t dynamic_uverbs_dev;
  73 static struct class *uverbs_class;
  74
  75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  76
  77 static 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
 117 static 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
 134 static void ib_uverbs_add_one(struct ib_device *device);
 135 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 136
 137 /*
 138  * Must be called with the ufile->device->disassociate_srcu held, and the lock
 139  * must be held until use of the ucontext is finished.
 140  */
 141 struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile)
 142 {
 143         /*
 144          * We do not hold the hw_destroy_rwsem lock for this flow, instead
 145          * srcu is used. It does not matter if someone races this with
 146          * get_context, we get NULL or valid ucontext.
 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 }
 159 EXPORT_SYMBOL(ib_uverbs_get_ucontext);
 160
 161 int 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
 172 static 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
 182 static struct kobj_type ib_uverbs_dev_ktype = {
 183         .release = ib_uverbs_release_dev,
 184 };
 185
 186 static 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
 194 void 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
 219 void 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
 232 void 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
 244 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 245 {
 246         complete(&dev->comp);
 247 }
 248
 249 void 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         if (file->async_file)
 269                 kref_put(&file->async_file->ref,
 270                          ib_uverbs_release_async_event_file);
 271         kobject_put(&file->device->kobj);
 272         kfree(file);
 273 }
 274
 275 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 276                                     struct file *filp, char __user *buf,
 277                                     size_t count, loff_t *pos,
 278                                     size_t eventsz)
 279 {
 280         struct ib_uverbs_event *event;
 281         int ret = 0;
 282
 283         spin_lock_irq(&ev_queue->lock);
 284
 285         while (list_empty(&ev_queue->event_list)) {
 286                 if (ev_queue->is_closed) {
 287                         spin_unlock_irq(&ev_queue->lock);
 288                         return -EIO;
 289                 }
 290
 291                 spin_unlock_irq(&ev_queue->lock);
 292                 if (filp->f_flags & O_NONBLOCK)
 293                         return -EAGAIN;
 294
 295                 if (wait_event_interruptible(ev_queue->poll_wait,
 296                                              (!list_empty(&ev_queue->event_list) ||
 297                                               ev_queue->is_closed)))
 298                         return -ERESTARTSYS;
 299
 300                 spin_lock_irq(&ev_queue->lock);
 301         }
 302
 303         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 304
 305         if (eventsz > count) {
 306                 ret   = -EINVAL;
 307                 event = NULL;
 308         } else {
 309                 list_del(ev_queue->event_list.next);
 310                 if (event->counter) {
 311                         ++(*event->counter);
 312                         list_del(&event->obj_list);
 313                 }
 314         }
 315
 316         spin_unlock_irq(&ev_queue->lock);
 317
 318         if (event) {
 319                 if (copy_to_user(buf, event, eventsz))
 320                         ret = -EFAULT;
 321                 else
 322                         ret = eventsz;
 323         }
 324
 325         kfree(event);
 326
 327         return ret;
 328 }
 329
 330 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 331                                           size_t count, loff_t *pos)
 332 {
 333         struct ib_uverbs_async_event_file *file = filp->private_data;
 334
 335         return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
 336                                     sizeof(struct ib_uverbs_async_event_desc));
 337 }
 338
 339 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 340                                          size_t count, loff_t *pos)
 341 {
 342         struct ib_uverbs_completion_event_file *comp_ev_file =
 343                 filp->private_data;
 344
 345         return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
 346                                     pos,
 347                                     sizeof(struct ib_uverbs_comp_event_desc));
 348 }
 349
 350 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 351                                          struct file *filp,
 352                                          struct poll_table_struct *wait)
 353 {
 354         __poll_t pollflags = 0;
 355
 356         poll_wait(filp, &ev_queue->poll_wait, wait);
 357
 358         spin_lock_irq(&ev_queue->lock);
 359         if (!list_empty(&ev_queue->event_list))
 360                 pollflags = EPOLLIN | EPOLLRDNORM;
 361         else if (ev_queue->is_closed)
 362                 pollflags = EPOLLERR;
 363         spin_unlock_irq(&ev_queue->lock);
 364
 365         return pollflags;
 366 }
 367
 368 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 369                                                struct poll_table_struct *wait)
 370 {
 371         struct ib_uverbs_async_event_file *file = filp->private_data;
 372
 373         return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
 374 }
 375
 376 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 377                                               struct poll_table_struct *wait)
 378 {
 379         struct ib_uverbs_completion_event_file *comp_ev_file =
 380                 filp->private_data;
 381
 382         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 383 }
 384
 385 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 386 {
 387         struct ib_uverbs_async_event_file *file = filp->private_data;
 388
 389         return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
 390 }
 391
 392 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 393 {
 394         struct ib_uverbs_completion_event_file *comp_ev_file =
 395                 filp->private_data;
 396
 397         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 398 }
 399
 400 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
 401 {
 402         struct ib_uverbs_async_event_file *file = filp->private_data;
 403         struct ib_uverbs_file *uverbs_file = file->uverbs_file;
 404         struct ib_uverbs_event *entry, *tmp;
 405         int closed_already = 0;
 406
 407         mutex_lock(&uverbs_file->device->lists_mutex);
 408         spin_lock_irq(&file->ev_queue.lock);
 409         closed_already = file->ev_queue.is_closed;
 410         file->ev_queue.is_closed = 1;
 411         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 412                 if (entry->counter)
 413                         list_del(&entry->obj_list);
 414                 kfree(entry);
 415         }
 416         spin_unlock_irq(&file->ev_queue.lock);
 417         if (!closed_already) {
 418                 list_del(&file->list);
 419                 ib_unregister_event_handler(&uverbs_file->event_handler);
 420         }
 421         mutex_unlock(&uverbs_file->device->lists_mutex);
 422
 423         kref_put(&uverbs_file->ref, ib_uverbs_release_file);
 424         kref_put(&file->ref, ib_uverbs_release_async_event_file);
 425
 426         return 0;
 427 }
 428
 429 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
 430 {
 431         struct ib_uobject *uobj = filp->private_data;
 432         struct ib_uverbs_completion_event_file *file = container_of(
 433                 uobj, struct ib_uverbs_completion_event_file, uobj);
 434         struct ib_uverbs_event *entry, *tmp;
 435
 436         spin_lock_irq(&file->ev_queue.lock);
 437         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 438                 if (entry->counter)
 439                         list_del(&entry->obj_list);
 440                 kfree(entry);
 441         }
 442         file->ev_queue.is_closed = 1;
 443         spin_unlock_irq(&file->ev_queue.lock);
 444
 445         uverbs_close_fd(filp);
 446
 447         return 0;
 448 }
 449
 450 const struct file_operations uverbs_event_fops = {
 451         .owner   = THIS_MODULE,
 452         .read    = ib_uverbs_comp_event_read,
 453         .poll    = ib_uverbs_comp_event_poll,
 454         .release = ib_uverbs_comp_event_close,
 455         .fasync  = ib_uverbs_comp_event_fasync,
 456         .llseek  = no_llseek,
 457 };
 458
 459 static const struct file_operations uverbs_async_event_fops = {
 460         .owner   = THIS_MODULE,
 461         .read    = ib_uverbs_async_event_read,
 462         .poll    = ib_uverbs_async_event_poll,
 463         .release = ib_uverbs_async_event_close,
 464         .fasync  = ib_uverbs_async_event_fasync,
 465         .llseek  = no_llseek,
 466 };
 467
 468 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 469 {
 470         struct ib_uverbs_event_queue   *ev_queue = cq_context;
 471         struct ib_ucq_object           *uobj;
 472         struct ib_uverbs_event         *entry;
 473         unsigned long                   flags;
 474
 475         if (!ev_queue)
 476                 return;
 477
 478         spin_lock_irqsave(&ev_queue->lock, flags);
 479         if (ev_queue->is_closed) {
 480                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 481                 return;
 482         }
 483
 484         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 485         if (!entry) {
 486                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 487                 return;
 488         }
 489
 490         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 491
 492         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 493         entry->counter             = &uobj->comp_events_reported;
 494
 495         list_add_tail(&entry->list, &ev_queue->event_list);
 496         list_add_tail(&entry->obj_list, &uobj->comp_list);
 497         spin_unlock_irqrestore(&ev_queue->lock, flags);
 498
 499         wake_up_interruptible(&ev_queue->poll_wait);
 500         kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
 501 }
 502
 503 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 504                                     __u64 element, __u64 event,
 505                                     struct list_head *obj_list,
 506                                     u32 *counter)
 507 {
 508         struct ib_uverbs_event *entry;
 509         unsigned long flags;
 510
 511         spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
 512         if (file->async_file->ev_queue.is_closed) {
 513                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 514                 return;
 515         }
 516
 517         entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 518         if (!entry) {
 519                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 520                 return;
 521         }
 522
 523         entry->desc.async.element    = element;
 524         entry->desc.async.event_type = event;
 525         entry->desc.async.reserved   = 0;
 526         entry->counter               = counter;
 527
 528         list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
 529         if (obj_list)
 530                 list_add_tail(&entry->obj_list, obj_list);
 531         spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 532
 533         wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
 534         kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
 535 }
 536
 537 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 538 {
 539         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 540                                                   struct ib_ucq_object, uobject);
 541
 542         ib_uverbs_async_handler(uobj->uobject.ufile, uobj->uobject.user_handle,
 543                                 event->event, &uobj->async_list,
 544                                 &uobj->async_events_reported);
 545 }
 546
 547 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 548 {
 549         struct ib_uevent_object *uobj;
 550
 551         /* for XRC target qp's, check that qp is live */
 552         if (!event->element.qp->uobject)
 553                 return;
 554
 555         uobj = container_of(event->element.qp->uobject,
 556                             struct ib_uevent_object, uobject);
 557
 558         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 559                                 event->event, &uobj->event_list,
 560                                 &uobj->events_reported);
 561 }
 562
 563 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 564 {
 565         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
 566                                                   struct ib_uevent_object, uobject);
 567
 568         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 569                                 event->event, &uobj->event_list,
 570                                 &uobj->events_reported);
 571 }
 572
 573 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 574 {
 575         struct ib_uevent_object *uobj;
 576
 577         uobj = container_of(event->element.srq->uobject,
 578                             struct ib_uevent_object, uobject);
 579
 580         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 581                                 event->event, &uobj->event_list,
 582                                 &uobj->events_reported);
 583 }
 584
 585 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 586                              struct ib_event *event)
 587 {
 588         struct ib_uverbs_file *file =
 589                 container_of(handler, struct ib_uverbs_file, event_handler);
 590
 591         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 592                                 NULL, NULL);
 593 }
 594
 595 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 596 {
 597         kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
 598         file->async_file = NULL;
 599 }
 600
 601 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
 602 {
 603         spin_lock_init(&ev_queue->lock);
 604         INIT_LIST_HEAD(&ev_queue->event_list);
 605         init_waitqueue_head(&ev_queue->poll_wait);
 606         ev_queue->is_closed   = 0;
 607         ev_queue->async_queue = NULL;
 608 }
 609
 610 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
 611                                               struct ib_device  *ib_dev)
 612 {
 613         struct ib_uverbs_async_event_file *ev_file;
 614         struct file *filp;
 615
 616         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 617         if (!ev_file)
 618                 return ERR_PTR(-ENOMEM);
 619
 620         ib_uverbs_init_event_queue(&ev_file->ev_queue);
 621         ev_file->uverbs_file = uverbs_file;
 622         kref_get(&ev_file->uverbs_file->ref);
 623         kref_init(&ev_file->ref);
 624         filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
 625                                   ev_file, O_RDONLY);
 626         if (IS_ERR(filp))
 627                 goto err_put_refs;
 628
 629         mutex_lock(&uverbs_file->device->lists_mutex);
 630         list_add_tail(&ev_file->list,
 631                       &uverbs_file->device->uverbs_events_file_list);
 632         mutex_unlock(&uverbs_file->device->lists_mutex);
 633
 634         WARN_ON(uverbs_file->async_file);
 635         uverbs_file->async_file = ev_file;
 636         kref_get(&uverbs_file->async_file->ref);
 637         INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 638                               ib_dev,
 639                               ib_uverbs_event_handler);
 640         ib_register_event_handler(&uverbs_file->event_handler);
 641         /* At that point async file stuff was fully set */
 642
 643         return filp;
 644
 645 err_put_refs:
 646         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 647         kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
 648         return filp;
 649 }
 650
 651 static bool verify_command_mask(struct ib_uverbs_file *ufile, u32 command,
 652                                 bool extended)
 653 {
 654         if (!extended)
 655                 return ufile->uverbs_cmd_mask & BIT_ULL(command);
 656
 657         return ufile->uverbs_ex_cmd_mask & BIT_ULL(command);
 658 }
 659
 660 static bool verify_command_idx(u32 command, bool extended)
 661 {
 662         if (extended)
 663                 return command < ARRAY_SIZE(uverbs_ex_cmd_table) &&
 664                        uverbs_ex_cmd_table[command];
 665
 666         return command < ARRAY_SIZE(uverbs_cmd_table) &&
 667                uverbs_cmd_table[command];
 668 }
 669
 670 static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr,
 671                            u32 *command, bool *extended)
 672 {
 673         if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED |
 674                                    IB_USER_VERBS_CMD_COMMAND_MASK))
 675                 return -EINVAL;
 676
 677         *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK;
 678         *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED;
 679
 680         if (!verify_command_idx(*command, *extended))
 681                 return -EOPNOTSUPP;
 682
 683         return 0;
 684 }
 685
 686 static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
 687                           struct ib_uverbs_ex_cmd_hdr *ex_hdr,
 688                           size_t count, bool extended)
 689 {
 690         if (extended) {
 691                 count -= sizeof(*hdr) + sizeof(*ex_hdr);
 692
 693                 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
 694                         return -EINVAL;
 695
 696                 if (ex_hdr->cmd_hdr_reserved)
 697                         return -EINVAL;
 698
 699                 if (ex_hdr->response) {
 700                         if (!hdr->out_words && !ex_hdr->provider_out_words)
 701                                 return -EINVAL;
 702
 703                         if (!access_ok(VERIFY_WRITE,
 704                                        u64_to_user_ptr(ex_hdr->response),
 705                                        (hdr->out_words + ex_hdr->provider_out_words) * 8))
 706                                 return -EFAULT;
 707                 } else {
 708                         if (hdr->out_words || ex_hdr->provider_out_words)
 709                                 return -EINVAL;
 710                 }
 711
 712                 return 0;
 713         }
 714
 715         /* not extended command */
 716         if (hdr->in_words * 4 != count)
 717                 return -EINVAL;
 718
 719         return 0;
 720 }
 721
 722 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 723                              size_t count, loff_t *pos)
 724 {
 725         struct ib_uverbs_file *file = filp->private_data;
 726         struct ib_uverbs_ex_cmd_hdr ex_hdr;
 727         struct ib_uverbs_cmd_hdr hdr;
 728         bool extended;
 729         int srcu_key;
 730         u32 command;
 731         ssize_t ret;
 732
 733         if (!ib_safe_file_access(filp)) {
 734                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 735                             task_tgid_vnr(current), current->comm);
 736                 return -EACCES;
 737         }
 738
 739         if (count < sizeof(hdr))
 740                 return -EINVAL;
 741
 742         if (copy_from_user(&hdr, buf, sizeof(hdr)))
 743                 return -EFAULT;
 744
 745         ret = process_hdr(&hdr, &command, &extended);
 746         if (ret)
 747                 return ret;
 748
 749         if (extended) {
 750                 if (count < (sizeof(hdr) + sizeof(ex_hdr)))
 751                         return -EINVAL;
 752                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
 753                         return -EFAULT;
 754         }
 755
 756         ret = verify_hdr(&hdr, &ex_hdr, count, extended);
 757         if (ret)
 758                 return ret;
 759
 760         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 761
 762         if (!verify_command_mask(file, command, extended)) {
 763                 ret = -EOPNOTSUPP;
 764                 goto out;
 765         }
 766
 767         buf += sizeof(hdr);
 768
 769         if (!extended) {
 770                 ret = uverbs_cmd_table[command](file, buf,
 771                                                 hdr.in_words * 4,
 772                                                 hdr.out_words * 4);
 773         } else {
 774                 struct ib_udata ucore;
 775                 struct ib_udata uhw;
 776
 777                 buf += sizeof(ex_hdr);
 778
 779                 ib_uverbs_init_udata_buf_or_null(&ucore, buf,
 780                                         u64_to_user_ptr(ex_hdr.response),
 781                                         hdr.in_words * 8, hdr.out_words * 8);
 782
 783                 ib_uverbs_init_udata_buf_or_null(&uhw,
 784                                         buf + ucore.inlen,
 785                                         u64_to_user_ptr(ex_hdr.response) + ucore.outlen,
 786                                         ex_hdr.provider_in_words * 8,
 787                                         ex_hdr.provider_out_words * 8);
 788
 789                 ret = uverbs_ex_cmd_table[command](file, &ucore, &uhw);
 790                 ret = (ret) ? : count;
 791         }
 792
 793 out:
 794         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 795         return ret;
 796 }
 797
 798 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 799 {
 800         struct ib_uverbs_file *file = filp->private_data;
 801         struct ib_ucontext *ucontext;
 802         int ret = 0;
 803         int srcu_key;
 804
 805         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 806         ucontext = ib_uverbs_get_ucontext(file);
 807         if (IS_ERR(ucontext)) {
 808                 ret = PTR_ERR(ucontext);
 809                 goto out;
 810         }
 811
 812         ret = ucontext->device->mmap(ucontext, vma);
 813 out:
 814         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 815         return ret;
 816 }
 817
 818 /*
 819  * ib_uverbs_open() does not need the BKL:
 820  *
 821  *  - the ib_uverbs_device structures are properly reference counted and
 822  *    everything else is purely local to the file being created, so
 823  *    races against other open calls are not a problem;
 824  *  - there is no ioctl method to race against;
 825  *  - the open method will either immediately run -ENXIO, or all
 826  *    required initialization will be done.
 827  */
 828 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 829 {
 830         struct ib_uverbs_device *dev;
 831         struct ib_uverbs_file *file;
 832         struct ib_device *ib_dev;
 833         int ret;
 834         int module_dependent;
 835         int srcu_key;
 836
 837         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 838         if (!atomic_inc_not_zero(&dev->refcount))
 839                 return -ENXIO;
 840
 841         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 842         mutex_lock(&dev->lists_mutex);
 843         ib_dev = srcu_dereference(dev->ib_dev,
 844                                   &dev->disassociate_srcu);
 845         if (!ib_dev) {
 846                 ret = -EIO;
 847                 goto err;
 848         }
 849
 850         /* In case IB device supports disassociate ucontext, there is no hard
 851          * dependency between uverbs device and its low level device.
 852          */
 853         module_dependent = !(ib_dev->disassociate_ucontext);
 854
 855         if (module_dependent) {
 856                 if (!try_module_get(ib_dev->owner)) {
 857                         ret = -ENODEV;
 858                         goto err;
 859                 }
 860         }
 861
 862         file = kzalloc(sizeof(*file), GFP_KERNEL);
 863         if (!file) {
 864                 ret = -ENOMEM;
 865                 if (module_dependent)
 866                         goto err_module;
 867
 868                 goto err;
 869         }
 870
 871         file->device     = dev;
 872         kref_init(&file->ref);
 873         mutex_init(&file->ucontext_lock);
 874
 875         spin_lock_init(&file->uobjects_lock);
 876         INIT_LIST_HEAD(&file->uobjects);
 877         init_rwsem(&file->hw_destroy_rwsem);
 878
 879         filp->private_data = file;
 880         kobject_get(&dev->kobj);
 881         list_add_tail(&file->list, &dev->uverbs_file_list);
 882         mutex_unlock(&dev->lists_mutex);
 883         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 884
 885         file->uverbs_cmd_mask = ib_dev->uverbs_cmd_mask;
 886         file->uverbs_ex_cmd_mask = ib_dev->uverbs_ex_cmd_mask;
 887
 888         setup_ufile_idr_uobject(file);
 889
 890         return nonseekable_open(inode, filp);
 891
 892 err_module:
 893         module_put(ib_dev->owner);
 894
 895 err:
 896         mutex_unlock(&dev->lists_mutex);
 897         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 898         if (atomic_dec_and_test(&dev->refcount))
 899                 ib_uverbs_comp_dev(dev);
 900
 901         return ret;
 902 }
 903
 904 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 905 {
 906         struct ib_uverbs_file *file = filp->private_data;
 907
 908         uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
 909
 910         mutex_lock(&file->device->lists_mutex);
 911         if (!file->is_closed) {
 912                 list_del(&file->list);
 913                 file->is_closed = 1;
 914         }
 915         mutex_unlock(&file->device->lists_mutex);
 916
 917         kref_put(&file->ref, ib_uverbs_release_file);
 918
 919         return 0;
 920 }
 921
 922 static const struct file_operations uverbs_fops = {
 923         .owner   = THIS_MODULE,
 924         .write   = ib_uverbs_write,
 925         .open    = ib_uverbs_open,
 926         .release = ib_uverbs_close,
 927         .llseek  = no_llseek,
 928         .unlocked_ioctl = ib_uverbs_ioctl,
 929         .compat_ioctl = ib_uverbs_ioctl,
 930 };
 931
 932 static const struct file_operations uverbs_mmap_fops = {
 933         .owner   = THIS_MODULE,
 934         .write   = ib_uverbs_write,
 935         .mmap    = ib_uverbs_mmap,
 936         .open    = ib_uverbs_open,
 937         .release = ib_uverbs_close,
 938         .llseek  = no_llseek,
 939         .unlocked_ioctl = ib_uverbs_ioctl,
 940         .compat_ioctl = ib_uverbs_ioctl,
 941 };
 942
 943 static struct ib_client uverbs_client = {
 944         .name   = "uverbs",
 945         .add    = ib_uverbs_add_one,
 946         .remove = ib_uverbs_remove_one
 947 };
 948
 949 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 950                           char *buf)
 951 {
 952         int ret = -ENODEV;
 953         int srcu_key;
 954         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 955         struct ib_device *ib_dev;
 956
 957         if (!dev)
 958                 return -ENODEV;
 959
 960         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 961         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 962         if (ib_dev)
 963                 ret = sprintf(buf, "%s\n", ib_dev->name);
 964         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 965
 966         return ret;
 967 }
 968 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 969
 970 static ssize_t show_dev_abi_version(struct device *device,
 971                                     struct device_attribute *attr, char *buf)
 972 {
 973         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 974         int ret = -ENODEV;
 975         int srcu_key;
 976         struct ib_device *ib_dev;
 977
 978         if (!dev)
 979                 return -ENODEV;
 980         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 981         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 982         if (ib_dev)
 983                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
 984         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 985
 986         return ret;
 987 }
 988 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 989
 990 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 991                          __stringify(IB_USER_VERBS_ABI_VERSION));
 992
 993 static int ib_uverbs_create_uapi(struct ib_device *device,
 994                                  struct ib_uverbs_device *uverbs_dev)
 995 {
 996         struct uverbs_api *uapi;
 997
 998         uapi = uverbs_alloc_api(device->driver_specs, device->driver_id);
 999         if (IS_ERR(uapi))
1000                 return PTR_ERR(uapi);
1001
1002         uverbs_dev->uapi = uapi;
1003         return 0;
1004 }
1005
1006 static void ib_uverbs_add_one(struct ib_device *device)
1007 {
1008         int devnum;
1009         dev_t base;
1010         struct ib_uverbs_device *uverbs_dev;
1011         int ret;
1012
1013         if (!device->alloc_ucontext)
1014                 return;
1015
1016         uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1017         if (!uverbs_dev)
1018                 return;
1019
1020         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1021         if (ret) {
1022                 kfree(uverbs_dev);
1023                 return;
1024         }
1025
1026         atomic_set(&uverbs_dev->refcount, 1);
1027         init_completion(&uverbs_dev->comp);
1028         uverbs_dev->xrcd_tree = RB_ROOT;
1029         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1030         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1031         mutex_init(&uverbs_dev->lists_mutex);
1032         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1033         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1034
1035         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1036         if (devnum >= IB_UVERBS_MAX_DEVICES)
1037                 goto err;
1038         uverbs_dev->devnum = devnum;
1039         set_bit(devnum, dev_map);
1040         if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1041                 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1042         else
1043                 base = IB_UVERBS_BASE_DEV + devnum;
1044
1045         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1046         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1047
1048         if (ib_uverbs_create_uapi(device, uverbs_dev))
1049                 goto err_uapi;
1050
1051         cdev_init(&uverbs_dev->cdev, NULL);
1052         uverbs_dev->cdev.owner = THIS_MODULE;
1053         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1054         cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1055         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1056         if (cdev_add(&uverbs_dev->cdev, base, 1))
1057                 goto err_cdev;
1058
1059         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1060                                         uverbs_dev->cdev.dev, uverbs_dev,
1061                                         "uverbs%d", uverbs_dev->devnum);
1062         if (IS_ERR(uverbs_dev->dev))
1063                 goto err_cdev;
1064
1065         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1066                 goto err_class;
1067         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1068                 goto err_class;
1069
1070         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1071
1072         return;
1073
1074 err_class:
1075         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1076 err_cdev:
1077         cdev_del(&uverbs_dev->cdev);
1078 err_uapi:
1079         clear_bit(devnum, dev_map);
1080 err:
1081         if (atomic_dec_and_test(&uverbs_dev->refcount))
1082                 ib_uverbs_comp_dev(uverbs_dev);
1083         wait_for_completion(&uverbs_dev->comp);
1084         kobject_put(&uverbs_dev->kobj);
1085         return;
1086 }
1087
1088 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1089                                         struct ib_device *ib_dev)
1090 {
1091         struct ib_uverbs_file *file;
1092         struct ib_uverbs_async_event_file *event_file;
1093         struct ib_event event;
1094
1095         /* Pending running commands to terminate */
1096         uverbs_disassociate_api_pre(uverbs_dev);
1097         event.event = IB_EVENT_DEVICE_FATAL;
1098         event.element.port_num = 0;
1099         event.device = ib_dev;
1100
1101         mutex_lock(&uverbs_dev->lists_mutex);
1102         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1103                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1104                                         struct ib_uverbs_file, list);
1105                 file->is_closed = 1;
1106                 list_del(&file->list);
1107                 kref_get(&file->ref);
1108
1109                 /* We must release the mutex before going ahead and calling
1110                  * uverbs_cleanup_ufile, as it might end up indirectly calling
1111                  * uverbs_close, for example due to freeing the resources (e.g
1112                  * mmput).
1113                  */
1114                 mutex_unlock(&uverbs_dev->lists_mutex);
1115
1116                 ib_uverbs_event_handler(&file->event_handler, &event);
1117                 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1118                 kref_put(&file->ref, ib_uverbs_release_file);
1119
1120                 mutex_lock(&uverbs_dev->lists_mutex);
1121         }
1122
1123         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1124                 event_file = list_first_entry(&uverbs_dev->
1125                                               uverbs_events_file_list,
1126                                               struct ib_uverbs_async_event_file,
1127                                               list);
1128                 spin_lock_irq(&event_file->ev_queue.lock);
1129                 event_file->ev_queue.is_closed = 1;
1130                 spin_unlock_irq(&event_file->ev_queue.lock);
1131
1132                 list_del(&event_file->list);
1133                 ib_unregister_event_handler(
1134                         &event_file->uverbs_file->event_handler);
1135                 event_file->uverbs_file->event_handler.device =
1136                         NULL;
1137
1138                 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1139                 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1140         }
1141         mutex_unlock(&uverbs_dev->lists_mutex);
1142
1143         uverbs_disassociate_api(uverbs_dev->uapi);
1144 }
1145
1146 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1147 {
1148         struct ib_uverbs_device *uverbs_dev = client_data;
1149         int wait_clients = 1;
1150
1151         if (!uverbs_dev)
1152                 return;
1153
1154         dev_set_drvdata(uverbs_dev->dev, NULL);
1155         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1156         cdev_del(&uverbs_dev->cdev);
1157         clear_bit(uverbs_dev->devnum, dev_map);
1158
1159         if (device->disassociate_ucontext) {
1160                 /* We disassociate HW resources and immediately return.
1161                  * Userspace will see a EIO errno for all future access.
1162                  * Upon returning, ib_device may be freed internally and is not
1163                  * valid any more.
1164                  * uverbs_device is still available until all clients close
1165                  * their files, then the uverbs device ref count will be zero
1166                  * and its resources will be freed.
1167                  * Note: At this point no more files can be opened since the
1168                  * cdev was deleted, however active clients can still issue
1169                  * commands and close their open files.
1170                  */
1171                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1172                 wait_clients = 0;
1173         }
1174
1175         if (atomic_dec_and_test(&uverbs_dev->refcount))
1176                 ib_uverbs_comp_dev(uverbs_dev);
1177         if (wait_clients)
1178                 wait_for_completion(&uverbs_dev->comp);
1179
1180         kobject_put(&uverbs_dev->kobj);
1181 }
1182
1183 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1184 {
1185         if (mode)
1186                 *mode = 0666;
1187         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1188 }
1189
1190 static int __init ib_uverbs_init(void)
1191 {
1192         int ret;
1193
1194         ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1195                                      IB_UVERBS_NUM_FIXED_MINOR,
1196                                      "infiniband_verbs");
1197         if (ret) {
1198                 pr_err("user_verbs: couldn't register device number\n");
1199                 goto out;
1200         }
1201
1202         ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1203                                   IB_UVERBS_NUM_DYNAMIC_MINOR,
1204                                   "infiniband_verbs");
1205         if (ret) {
1206                 pr_err("couldn't register dynamic device number\n");
1207                 goto out_alloc;
1208         }
1209
1210         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1211         if (IS_ERR(uverbs_class)) {
1212                 ret = PTR_ERR(uverbs_class);
1213                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1214                 goto out_chrdev;
1215         }
1216
1217         uverbs_class->devnode = uverbs_devnode;
1218
1219         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1220         if (ret) {
1221                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1222                 goto out_class;
1223         }
1224
1225         ret = ib_register_client(&uverbs_client);
1226         if (ret) {
1227                 pr_err("user_verbs: couldn't register client\n");
1228                 goto out_class;
1229         }
1230
1231         return 0;
1232
1233 out_class:
1234         class_destroy(uverbs_class);
1235
1236 out_chrdev:
1237         unregister_chrdev_region(dynamic_uverbs_dev,
1238                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1239
1240 out_alloc:
1241         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1242                                  IB_UVERBS_NUM_FIXED_MINOR);
1243
1244 out:
1245         return ret;
1246 }
1247
1248 static void __exit ib_uverbs_cleanup(void)
1249 {
1250         ib_unregister_client(&uverbs_client);
1251         class_destroy(uverbs_class);
1252         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1253                                  IB_UVERBS_NUM_FIXED_MINOR);
1254         unregister_chrdev_region(dynamic_uverbs_dev,
1255                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1256 }
1257
1258 module_init(ib_uverbs_init);
1259 module_exit(ib_uverbs_cleanup);