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         kobject_put(&file->device->kobj);
 269         kfree(file);
 270 }
 271
 272 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 273                                     struct ib_uverbs_file *uverbs_file,
 274                                     struct file *filp, char __user *buf,
 275                                     size_t count, loff_t *pos,
 276                                     size_t eventsz)
 277 {
 278         struct ib_uverbs_event *event;
 279         int ret = 0;
 280
 281         spin_lock_irq(&ev_queue->lock);
 282
 283         while (list_empty(&ev_queue->event_list)) {
 284                 spin_unlock_irq(&ev_queue->lock);
 285
 286                 if (filp->f_flags & O_NONBLOCK)
 287                         return -EAGAIN;
 288
 289                 if (wait_event_interruptible(ev_queue->poll_wait,
 290                                              (!list_empty(&ev_queue->event_list) ||
 291                         /* The barriers built into wait_event_interruptible()
 292                          * and wake_up() guarentee this will see the null set
 293                          * without using RCU
 294                          */
 295                                              !uverbs_file->device->ib_dev)))
 296                         return -ERESTARTSYS;
 297
 298                 /* If device was disassociated and no event exists set an error */
 299                 if (list_empty(&ev_queue->event_list) &&
 300                     !uverbs_file->device->ib_dev)
 301                         return -EIO;
 302
 303                 spin_lock_irq(&ev_queue->lock);
 304         }
 305
 306         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 307
 308         if (eventsz > count) {
 309                 ret   = -EINVAL;
 310                 event = NULL;
 311         } else {
 312                 list_del(ev_queue->event_list.next);
 313                 if (event->counter) {
 314                         ++(*event->counter);
 315                         list_del(&event->obj_list);
 316                 }
 317         }
 318
 319         spin_unlock_irq(&ev_queue->lock);
 320
 321         if (event) {
 322                 if (copy_to_user(buf, event, eventsz))
 323                         ret = -EFAULT;
 324                 else
 325                         ret = eventsz;
 326         }
 327
 328         kfree(event);
 329
 330         return ret;
 331 }
 332
 333 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 334                                           size_t count, loff_t *pos)
 335 {
 336         struct ib_uverbs_async_event_file *file = filp->private_data;
 337
 338         return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
 339                                     buf, count, pos,
 340                                     sizeof(struct ib_uverbs_async_event_desc));
 341 }
 342
 343 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 344                                          size_t count, loff_t *pos)
 345 {
 346         struct ib_uverbs_completion_event_file *comp_ev_file =
 347                 filp->private_data;
 348
 349         return ib_uverbs_event_read(&comp_ev_file->ev_queue,
 350                                     comp_ev_file->uobj.ufile, filp,
 351                                     buf, count, pos,
 352                                     sizeof(struct ib_uverbs_comp_event_desc));
 353 }
 354
 355 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 356                                          struct file *filp,
 357                                          struct poll_table_struct *wait)
 358 {
 359         __poll_t pollflags = 0;
 360
 361         poll_wait(filp, &ev_queue->poll_wait, wait);
 362
 363         spin_lock_irq(&ev_queue->lock);
 364         if (!list_empty(&ev_queue->event_list))
 365                 pollflags = EPOLLIN | EPOLLRDNORM;
 366         spin_unlock_irq(&ev_queue->lock);
 367
 368         return pollflags;
 369 }
 370
 371 static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 372                                                struct poll_table_struct *wait)
 373 {
 374         return ib_uverbs_event_poll(filp->private_data, filp, wait);
 375 }
 376
 377 static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 378                                               struct poll_table_struct *wait)
 379 {
 380         struct ib_uverbs_completion_event_file *comp_ev_file =
 381                 filp->private_data;
 382
 383         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 384 }
 385
 386 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 387 {
 388         struct ib_uverbs_event_queue *ev_queue = filp->private_data;
 389
 390         return fasync_helper(fd, filp, on, &ev_queue->async_queue);
 391 }
 392
 393 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 394 {
 395         struct ib_uverbs_completion_event_file *comp_ev_file =
 396                 filp->private_data;
 397
 398         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 399 }
 400
 401 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
 402 {
 403         struct ib_uverbs_async_event_file *file = filp->private_data;
 404         struct ib_uverbs_file *uverbs_file = file->uverbs_file;
 405         struct ib_uverbs_event *entry, *tmp;
 406         int closed_already = 0;
 407
 408         mutex_lock(&uverbs_file->device->lists_mutex);
 409         spin_lock_irq(&file->ev_queue.lock);
 410         closed_already = file->ev_queue.is_closed;
 411         file->ev_queue.is_closed = 1;
 412         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 413                 if (entry->counter)
 414                         list_del(&entry->obj_list);
 415                 kfree(entry);
 416         }
 417         spin_unlock_irq(&file->ev_queue.lock);
 418         if (!closed_already) {
 419                 list_del(&file->list);
 420                 ib_unregister_event_handler(&uverbs_file->event_handler);
 421         }
 422         mutex_unlock(&uverbs_file->device->lists_mutex);
 423
 424         kref_put(&uverbs_file->ref, ib_uverbs_release_file);
 425         kref_put(&file->ref, ib_uverbs_release_async_event_file);
 426
 427         return 0;
 428 }
 429
 430 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
 431 {
 432         struct ib_uobject *uobj = filp->private_data;
 433         struct ib_uverbs_completion_event_file *file = container_of(
 434                 uobj, struct ib_uverbs_completion_event_file, uobj);
 435         struct ib_uverbs_event *entry, *tmp;
 436
 437         spin_lock_irq(&file->ev_queue.lock);
 438         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 439                 if (entry->counter)
 440                         list_del(&entry->obj_list);
 441                 kfree(entry);
 442         }
 443         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         if (file->async_file)
 918                 kref_put(&file->async_file->ref,
 919                          ib_uverbs_release_async_event_file);
 920
 921         kref_put(&file->ref, ib_uverbs_release_file);
 922
 923         return 0;
 924 }
 925
 926 static const struct file_operations uverbs_fops = {
 927         .owner   = THIS_MODULE,
 928         .write   = ib_uverbs_write,
 929         .open    = ib_uverbs_open,
 930         .release = ib_uverbs_close,
 931         .llseek  = no_llseek,
 932         .unlocked_ioctl = ib_uverbs_ioctl,
 933         .compat_ioctl = ib_uverbs_ioctl,
 934 };
 935
 936 static const struct file_operations uverbs_mmap_fops = {
 937         .owner   = THIS_MODULE,
 938         .write   = ib_uverbs_write,
 939         .mmap    = ib_uverbs_mmap,
 940         .open    = ib_uverbs_open,
 941         .release = ib_uverbs_close,
 942         .llseek  = no_llseek,
 943         .unlocked_ioctl = ib_uverbs_ioctl,
 944         .compat_ioctl = ib_uverbs_ioctl,
 945 };
 946
 947 static struct ib_client uverbs_client = {
 948         .name   = "uverbs",
 949         .add    = ib_uverbs_add_one,
 950         .remove = ib_uverbs_remove_one
 951 };
 952
 953 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 954                           char *buf)
 955 {
 956         int ret = -ENODEV;
 957         int srcu_key;
 958         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 959         struct ib_device *ib_dev;
 960
 961         if (!dev)
 962                 return -ENODEV;
 963
 964         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 965         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 966         if (ib_dev)
 967                 ret = sprintf(buf, "%s\n", ib_dev->name);
 968         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 969
 970         return ret;
 971 }
 972 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 973
 974 static ssize_t show_dev_abi_version(struct device *device,
 975                                     struct device_attribute *attr, char *buf)
 976 {
 977         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 978         int ret = -ENODEV;
 979         int srcu_key;
 980         struct ib_device *ib_dev;
 981
 982         if (!dev)
 983                 return -ENODEV;
 984         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 985         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 986         if (ib_dev)
 987                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
 988         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 989
 990         return ret;
 991 }
 992 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 993
 994 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 995                          __stringify(IB_USER_VERBS_ABI_VERSION));
 996
 997 static int ib_uverbs_create_uapi(struct ib_device *device,
 998                                  struct ib_uverbs_device *uverbs_dev)
 999 {
1000         struct uverbs_api *uapi;
1001
1002         uapi = uverbs_alloc_api(device->driver_specs, device->driver_id);
1003         if (IS_ERR(uapi))
1004                 return PTR_ERR(uapi);
1005
1006         uverbs_dev->uapi = uapi;
1007         return 0;
1008 }
1009
1010 static void ib_uverbs_add_one(struct ib_device *device)
1011 {
1012         int devnum;
1013         dev_t base;
1014         struct ib_uverbs_device *uverbs_dev;
1015         int ret;
1016
1017         if (!device->alloc_ucontext)
1018                 return;
1019
1020         uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1021         if (!uverbs_dev)
1022                 return;
1023
1024         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1025         if (ret) {
1026                 kfree(uverbs_dev);
1027                 return;
1028         }
1029
1030         atomic_set(&uverbs_dev->refcount, 1);
1031         init_completion(&uverbs_dev->comp);
1032         uverbs_dev->xrcd_tree = RB_ROOT;
1033         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1034         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1035         mutex_init(&uverbs_dev->lists_mutex);
1036         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1037         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1038
1039         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1040         if (devnum >= IB_UVERBS_MAX_DEVICES)
1041                 goto err;
1042         uverbs_dev->devnum = devnum;
1043         set_bit(devnum, dev_map);
1044         if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1045                 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1046         else
1047                 base = IB_UVERBS_BASE_DEV + devnum;
1048
1049         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1050         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1051
1052         if (ib_uverbs_create_uapi(device, uverbs_dev))
1053                 goto err_uapi;
1054
1055         cdev_init(&uverbs_dev->cdev, NULL);
1056         uverbs_dev->cdev.owner = THIS_MODULE;
1057         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1058         cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1059         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1060         if (cdev_add(&uverbs_dev->cdev, base, 1))
1061                 goto err_cdev;
1062
1063         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1064                                         uverbs_dev->cdev.dev, uverbs_dev,
1065                                         "uverbs%d", uverbs_dev->devnum);
1066         if (IS_ERR(uverbs_dev->dev))
1067                 goto err_cdev;
1068
1069         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1070                 goto err_class;
1071         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1072                 goto err_class;
1073
1074         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1075
1076         return;
1077
1078 err_class:
1079         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1080 err_cdev:
1081         cdev_del(&uverbs_dev->cdev);
1082 err_uapi:
1083         clear_bit(devnum, dev_map);
1084 err:
1085         if (atomic_dec_and_test(&uverbs_dev->refcount))
1086                 ib_uverbs_comp_dev(uverbs_dev);
1087         wait_for_completion(&uverbs_dev->comp);
1088         kobject_put(&uverbs_dev->kobj);
1089         return;
1090 }
1091
1092 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1093                                         struct ib_device *ib_dev)
1094 {
1095         struct ib_uverbs_file *file;
1096         struct ib_uverbs_async_event_file *event_file;
1097         struct ib_event event;
1098
1099         /* Pending running commands to terminate */
1100         uverbs_disassociate_api_pre(uverbs_dev);
1101         event.event = IB_EVENT_DEVICE_FATAL;
1102         event.element.port_num = 0;
1103         event.device = ib_dev;
1104
1105         mutex_lock(&uverbs_dev->lists_mutex);
1106         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1107                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1108                                         struct ib_uverbs_file, list);
1109                 file->is_closed = 1;
1110                 list_del(&file->list);
1111                 kref_get(&file->ref);
1112
1113                 /* We must release the mutex before going ahead and calling
1114                  * uverbs_cleanup_ufile, as it might end up indirectly calling
1115                  * uverbs_close, for example due to freeing the resources (e.g
1116                  * mmput).
1117                  */
1118                 mutex_unlock(&uverbs_dev->lists_mutex);
1119
1120                 ib_uverbs_event_handler(&file->event_handler, &event);
1121                 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1122                 kref_put(&file->ref, ib_uverbs_release_file);
1123
1124                 mutex_lock(&uverbs_dev->lists_mutex);
1125         }
1126
1127         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1128                 event_file = list_first_entry(&uverbs_dev->
1129                                               uverbs_events_file_list,
1130                                               struct ib_uverbs_async_event_file,
1131                                               list);
1132                 spin_lock_irq(&event_file->ev_queue.lock);
1133                 event_file->ev_queue.is_closed = 1;
1134                 spin_unlock_irq(&event_file->ev_queue.lock);
1135
1136                 list_del(&event_file->list);
1137                 ib_unregister_event_handler(
1138                         &event_file->uverbs_file->event_handler);
1139                 event_file->uverbs_file->event_handler.device =
1140                         NULL;
1141
1142                 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1143                 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1144         }
1145         mutex_unlock(&uverbs_dev->lists_mutex);
1146
1147         uverbs_disassociate_api(uverbs_dev->uapi);
1148 }
1149
1150 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1151 {
1152         struct ib_uverbs_device *uverbs_dev = client_data;
1153         int wait_clients = 1;
1154
1155         if (!uverbs_dev)
1156                 return;
1157
1158         dev_set_drvdata(uverbs_dev->dev, NULL);
1159         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1160         cdev_del(&uverbs_dev->cdev);
1161         clear_bit(uverbs_dev->devnum, dev_map);
1162
1163         if (device->disassociate_ucontext) {
1164                 /* We disassociate HW resources and immediately return.
1165                  * Userspace will see a EIO errno for all future access.
1166                  * Upon returning, ib_device may be freed internally and is not
1167                  * valid any more.
1168                  * uverbs_device is still available until all clients close
1169                  * their files, then the uverbs device ref count will be zero
1170                  * and its resources will be freed.
1171                  * Note: At this point no more files can be opened since the
1172                  * cdev was deleted, however active clients can still issue
1173                  * commands and close their open files.
1174                  */
1175                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1176                 wait_clients = 0;
1177         }
1178
1179         if (atomic_dec_and_test(&uverbs_dev->refcount))
1180                 ib_uverbs_comp_dev(uverbs_dev);
1181         if (wait_clients)
1182                 wait_for_completion(&uverbs_dev->comp);
1183
1184         kobject_put(&uverbs_dev->kobj);
1185 }
1186
1187 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1188 {
1189         if (mode)
1190                 *mode = 0666;
1191         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1192 }
1193
1194 static int __init ib_uverbs_init(void)
1195 {
1196         int ret;
1197
1198         ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1199                                      IB_UVERBS_NUM_FIXED_MINOR,
1200                                      "infiniband_verbs");
1201         if (ret) {
1202                 pr_err("user_verbs: couldn't register device number\n");
1203                 goto out;
1204         }
1205
1206         ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1207                                   IB_UVERBS_NUM_DYNAMIC_MINOR,
1208                                   "infiniband_verbs");
1209         if (ret) {
1210                 pr_err("couldn't register dynamic device number\n");
1211                 goto out_alloc;
1212         }
1213
1214         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1215         if (IS_ERR(uverbs_class)) {
1216                 ret = PTR_ERR(uverbs_class);
1217                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1218                 goto out_chrdev;
1219         }
1220
1221         uverbs_class->devnode = uverbs_devnode;
1222
1223         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1224         if (ret) {
1225                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1226                 goto out_class;
1227         }
1228
1229         ret = ib_register_client(&uverbs_client);
1230         if (ret) {
1231                 pr_err("user_verbs: couldn't register client\n");
1232                 goto out_class;
1233         }
1234
1235         return 0;
1236
1237 out_class:
1238         class_destroy(uverbs_class);
1239
1240 out_chrdev:
1241         unregister_chrdev_region(dynamic_uverbs_dev,
1242                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1243
1244 out_alloc:
1245         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1246                                  IB_UVERBS_NUM_FIXED_MINOR);
1247
1248 out:
1249         return ret;
1250 }
1251
1252 static void __exit ib_uverbs_cleanup(void)
1253 {
1254         ib_unregister_client(&uverbs_client);
1255         class_destroy(uverbs_class);
1256         unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1257                                  IB_UVERBS_NUM_FIXED_MINOR);
1258         unregister_chrdev_region(dynamic_uverbs_dev,
1259                                  IB_UVERBS_NUM_DYNAMIC_MINOR);
1260 }
1261
1262 module_init(ib_uverbs_init);
1263 module_exit(ib_uverbs_cleanup);