kernel/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 <asm/uaccess.h>
  50
  51 #include "uverbs.h"
  52
  53 MODULE_AUTHOR("Roland Dreier");
  54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 enum {
  58         IB_UVERBS_MAJOR       = 231,
  59         IB_UVERBS_BASE_MINOR  = 192,
  60         IB_UVERBS_MAX_DEVICES = 32
  61 };
  62
  63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  64
  65 static struct class *uverbs_class;
  66
  67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  68 DEFINE_IDR(ib_uverbs_pd_idr);
  69 DEFINE_IDR(ib_uverbs_mr_idr);
  70 DEFINE_IDR(ib_uverbs_mw_idr);
  71 DEFINE_IDR(ib_uverbs_ah_idr);
  72 DEFINE_IDR(ib_uverbs_cq_idr);
  73 DEFINE_IDR(ib_uverbs_qp_idr);
  74 DEFINE_IDR(ib_uverbs_srq_idr);
  75 DEFINE_IDR(ib_uverbs_xrcd_idr);
  76 DEFINE_IDR(ib_uverbs_rule_idr);
  77
  78 static DEFINE_SPINLOCK(map_lock);
  79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  80
  81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  82                                      struct ib_device *ib_dev,
  83                                      const char __user *buf, int in_len,
  84                                      int out_len) = {
  85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  91         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  92         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  93         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  94         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  95         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  96         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  97         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  98         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  99         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 100         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
 101         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 102         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 103         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 104         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 105         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 106         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 107         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 108         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 109         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 110         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 111         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 112         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 113         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 114         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 115         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 116         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 117         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 118         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 119         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 120 };
 121
 122 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 123                                     struct ib_device *ib_dev,
 124                                     struct ib_udata *ucore,
 125                                     struct ib_udata *uhw) = {
 126         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 127         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 128         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 129         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 130         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 131 };
 132
 133 static void ib_uverbs_add_one(struct ib_device *device);
 134 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 135
 136 static void ib_uverbs_release_dev(struct kobject *kobj)
 137 {
 138         struct ib_uverbs_device *dev =
 139                 container_of(kobj, struct ib_uverbs_device, kobj);
 140
 141         cleanup_srcu_struct(&dev->disassociate_srcu);
 142         kfree(dev);
 143 }
 144
 145 static struct kobj_type ib_uverbs_dev_ktype = {
 146         .release = ib_uverbs_release_dev,
 147 };
 148
 149 static void ib_uverbs_release_event_file(struct kref *ref)
 150 {
 151         struct ib_uverbs_event_file *file =
 152                 container_of(ref, struct ib_uverbs_event_file, ref);
 153
 154         kfree(file);
 155 }
 156
 157 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 158                           struct ib_uverbs_event_file *ev_file,
 159                           struct ib_ucq_object *uobj)
 160 {
 161         struct ib_uverbs_event *evt, *tmp;
 162
 163         if (ev_file) {
 164                 spin_lock_irq(&ev_file->lock);
 165                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 166                         list_del(&evt->list);
 167                         kfree(evt);
 168                 }
 169                 spin_unlock_irq(&ev_file->lock);
 170
 171                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 172         }
 173
 174         spin_lock_irq(&file->async_file->lock);
 175         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 176                 list_del(&evt->list);
 177                 kfree(evt);
 178         }
 179         spin_unlock_irq(&file->async_file->lock);
 180 }
 181
 182 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 183                               struct ib_uevent_object *uobj)
 184 {
 185         struct ib_uverbs_event *evt, *tmp;
 186
 187         spin_lock_irq(&file->async_file->lock);
 188         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 189                 list_del(&evt->list);
 190                 kfree(evt);
 191         }
 192         spin_unlock_irq(&file->async_file->lock);
 193 }
 194
 195 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 196                                     struct ib_uqp_object *uobj)
 197 {
 198         struct ib_uverbs_mcast_entry *mcast, *tmp;
 199
 200         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 201                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 202                 list_del(&mcast->list);
 203                 kfree(mcast);
 204         }
 205 }
 206
 207 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 208                                       struct ib_ucontext *context)
 209 {
 210         struct ib_uobject *uobj, *tmp;
 211
 212         context->closing = 1;
 213
 214         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 215                 struct ib_ah *ah = uobj->object;
 216
 217                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 218                 ib_destroy_ah(ah);
 219                 kfree(uobj);
 220         }
 221
 222         /* Remove MWs before QPs, in order to support type 2A MWs. */
 223         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 224                 struct ib_mw *mw = uobj->object;
 225
 226                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 227                 ib_dealloc_mw(mw);
 228                 kfree(uobj);
 229         }
 230
 231         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 232                 struct ib_flow *flow_id = uobj->object;
 233
 234                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 235                 ib_destroy_flow(flow_id);
 236                 kfree(uobj);
 237         }
 238
 239         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 240                 struct ib_qp *qp = uobj->object;
 241                 struct ib_uqp_object *uqp =
 242                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 243
 244                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 245                 if (qp != qp->real_qp) {
 246                         ib_close_qp(qp);
 247                 } else {
 248                         ib_uverbs_detach_umcast(qp, uqp);
 249                         ib_destroy_qp(qp);
 250                 }
 251                 ib_uverbs_release_uevent(file, &uqp->uevent);
 252                 kfree(uqp);
 253         }
 254
 255         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 256                 struct ib_srq *srq = uobj->object;
 257                 struct ib_uevent_object *uevent =
 258                         container_of(uobj, struct ib_uevent_object, uobject);
 259
 260                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 261                 ib_destroy_srq(srq);
 262                 ib_uverbs_release_uevent(file, uevent);
 263                 kfree(uevent);
 264         }
 265
 266         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 267                 struct ib_cq *cq = uobj->object;
 268                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 269                 struct ib_ucq_object *ucq =
 270                         container_of(uobj, struct ib_ucq_object, uobject);
 271
 272                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 273                 ib_destroy_cq(cq);
 274                 ib_uverbs_release_ucq(file, ev_file, ucq);
 275                 kfree(ucq);
 276         }
 277
 278         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 279                 struct ib_mr *mr = uobj->object;
 280
 281                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 282                 ib_dereg_mr(mr);
 283                 kfree(uobj);
 284         }
 285
 286         mutex_lock(&file->device->xrcd_tree_mutex);
 287         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 288                 struct ib_xrcd *xrcd = uobj->object;
 289                 struct ib_uxrcd_object *uxrcd =
 290                         container_of(uobj, struct ib_uxrcd_object, uobject);
 291
 292                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 293                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 294                 kfree(uxrcd);
 295         }
 296         mutex_unlock(&file->device->xrcd_tree_mutex);
 297
 298         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 299                 struct ib_pd *pd = uobj->object;
 300
 301                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 302                 ib_dealloc_pd(pd);
 303                 kfree(uobj);
 304         }
 305
 306         put_pid(context->tgid);
 307
 308         return context->device->dealloc_ucontext(context);
 309 }
 310
 311 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 312 {
 313         complete(&dev->comp);
 314 }
 315
 316 static void ib_uverbs_release_file(struct kref *ref)
 317 {
 318         struct ib_uverbs_file *file =
 319                 container_of(ref, struct ib_uverbs_file, ref);
 320         struct ib_device *ib_dev;
 321         int srcu_key;
 322
 323         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 324         ib_dev = srcu_dereference(file->device->ib_dev,
 325                                   &file->device->disassociate_srcu);
 326         if (ib_dev && !ib_dev->disassociate_ucontext)
 327                 module_put(ib_dev->owner);
 328         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 329
 330         if (atomic_dec_and_test(&file->device->refcount))
 331                 ib_uverbs_comp_dev(file->device);
 332
 333         kfree(file);
 334 }
 335
 336 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 337                                     size_t count, loff_t *pos)
 338 {
 339         struct ib_uverbs_event_file *file = filp->private_data;
 340         struct ib_uverbs_event *event;
 341         int eventsz;
 342         int ret = 0;
 343
 344         spin_lock_irq(&file->lock);
 345
 346         while (list_empty(&file->event_list)) {
 347                 spin_unlock_irq(&file->lock);
 348
 349                 if (filp->f_flags & O_NONBLOCK)
 350                         return -EAGAIN;
 351
 352                 if (wait_event_interruptible(file->poll_wait,
 353                                              (!list_empty(&file->event_list) ||
 354                         /* The barriers built into wait_event_interruptible()
 355                          * and wake_up() guarentee this will see the null set
 356                          * without using RCU
 357                          */
 358                                              !file->uverbs_file->device->ib_dev)))
 359                         return -ERESTARTSYS;
 360
 361                 /* If device was disassociated and no event exists set an error */
 362                 if (list_empty(&file->event_list) &&
 363                     !file->uverbs_file->device->ib_dev)
 364                         return -EIO;
 365
 366                 spin_lock_irq(&file->lock);
 367         }
 368
 369         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 370
 371         if (file->is_async)
 372                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 373         else
 374                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 375
 376         if (eventsz > count) {
 377                 ret   = -EINVAL;
 378                 event = NULL;
 379         } else {
 380                 list_del(file->event_list.next);
 381                 if (event->counter) {
 382                         ++(*event->counter);
 383                         list_del(&event->obj_list);
 384                 }
 385         }
 386
 387         spin_unlock_irq(&file->lock);
 388
 389         if (event) {
 390                 if (copy_to_user(buf, event, eventsz))
 391                         ret = -EFAULT;
 392                 else
 393                         ret = eventsz;
 394         }
 395
 396         kfree(event);
 397
 398         return ret;
 399 }
 400
 401 static unsigned int ib_uverbs_event_poll(struct file *filp,
 402                                          struct poll_table_struct *wait)
 403 {
 404         unsigned int pollflags = 0;
 405         struct ib_uverbs_event_file *file = filp->private_data;
 406
 407         poll_wait(filp, &file->poll_wait, wait);
 408
 409         spin_lock_irq(&file->lock);
 410         if (!list_empty(&file->event_list))
 411                 pollflags = POLLIN | POLLRDNORM;
 412         spin_unlock_irq(&file->lock);
 413
 414         return pollflags;
 415 }
 416
 417 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 418 {
 419         struct ib_uverbs_event_file *file = filp->private_data;
 420
 421         return fasync_helper(fd, filp, on, &file->async_queue);
 422 }
 423
 424 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 425 {
 426         struct ib_uverbs_event_file *file = filp->private_data;
 427         struct ib_uverbs_event *entry, *tmp;
 428         int closed_already = 0;
 429
 430         mutex_lock(&file->uverbs_file->device->lists_mutex);
 431         spin_lock_irq(&file->lock);
 432         closed_already = file->is_closed;
 433         file->is_closed = 1;
 434         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 435                 if (entry->counter)
 436                         list_del(&entry->obj_list);
 437                 kfree(entry);
 438         }
 439         spin_unlock_irq(&file->lock);
 440         if (!closed_already) {
 441                 list_del(&file->list);
 442                 if (file->is_async)
 443                         ib_unregister_event_handler(&file->uverbs_file->
 444                                 event_handler);
 445         }
 446         mutex_unlock(&file->uverbs_file->device->lists_mutex);
 447
 448         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 449         kref_put(&file->ref, ib_uverbs_release_event_file);
 450
 451         return 0;
 452 }
 453
 454 static const struct file_operations uverbs_event_fops = {
 455         .owner   = THIS_MODULE,
 456         .read    = ib_uverbs_event_read,
 457         .poll    = ib_uverbs_event_poll,
 458         .release = ib_uverbs_event_close,
 459         .fasync  = ib_uverbs_event_fasync,
 460         .llseek  = no_llseek,
 461 };
 462
 463 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 464 {
 465         struct ib_uverbs_event_file    *file = cq_context;
 466         struct ib_ucq_object           *uobj;
 467         struct ib_uverbs_event         *entry;
 468         unsigned long                   flags;
 469
 470         if (!file)
 471                 return;
 472
 473         spin_lock_irqsave(&file->lock, flags);
 474         if (file->is_closed) {
 475                 spin_unlock_irqrestore(&file->lock, flags);
 476                 return;
 477         }
 478
 479         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 480         if (!entry) {
 481                 spin_unlock_irqrestore(&file->lock, flags);
 482                 return;
 483         }
 484
 485         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 486
 487         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 488         entry->counter             = &uobj->comp_events_reported;
 489
 490         list_add_tail(&entry->list, &file->event_list);
 491         list_add_tail(&entry->obj_list, &uobj->comp_list);
 492         spin_unlock_irqrestore(&file->lock, flags);
 493
 494         wake_up_interruptible(&file->poll_wait);
 495         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 496 }
 497
 498 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 499                                     __u64 element, __u64 event,
 500                                     struct list_head *obj_list,
 501                                     u32 *counter)
 502 {
 503         struct ib_uverbs_event *entry;
 504         unsigned long flags;
 505
 506         spin_lock_irqsave(&file->async_file->lock, flags);
 507         if (file->async_file->is_closed) {
 508                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 509                 return;
 510         }
 511
 512         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 513         if (!entry) {
 514                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 515                 return;
 516         }
 517
 518         entry->desc.async.element    = element;
 519         entry->desc.async.event_type = event;
 520         entry->desc.async.reserved   = 0;
 521         entry->counter               = counter;
 522
 523         list_add_tail(&entry->list, &file->async_file->event_list);
 524         if (obj_list)
 525                 list_add_tail(&entry->obj_list, obj_list);
 526         spin_unlock_irqrestore(&file->async_file->lock, flags);
 527
 528         wake_up_interruptible(&file->async_file->poll_wait);
 529         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 530 }
 531
 532 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 533 {
 534         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 535                                                   struct ib_ucq_object, uobject);
 536
 537         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 538                                 event->event, &uobj->async_list,
 539                                 &uobj->async_events_reported);
 540 }
 541
 542 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 543 {
 544         struct ib_uevent_object *uobj;
 545
 546         /* for XRC target qp's, check that qp is live */
 547         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
 548                 return;
 549
 550         uobj = container_of(event->element.qp->uobject,
 551                             struct ib_uevent_object, uobject);
 552
 553         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 554                                 event->event, &uobj->event_list,
 555                                 &uobj->events_reported);
 556 }
 557
 558 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 559 {
 560         struct ib_uevent_object *uobj;
 561
 562         uobj = container_of(event->element.srq->uobject,
 563                             struct ib_uevent_object, uobject);
 564
 565         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 566                                 event->event, &uobj->event_list,
 567                                 &uobj->events_reported);
 568 }
 569
 570 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 571                              struct ib_event *event)
 572 {
 573         struct ib_uverbs_file *file =
 574                 container_of(handler, struct ib_uverbs_file, event_handler);
 575
 576         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 577                                 NULL, NULL);
 578 }
 579
 580 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 581 {
 582         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 583         file->async_file = NULL;
 584 }
 585
 586 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 587                                         struct ib_device        *ib_dev,
 588                                         int is_async)
 589 {
 590         struct ib_uverbs_event_file *ev_file;
 591         struct file *filp;
 592         int ret;
 593
 594         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 595         if (!ev_file)
 596                 return ERR_PTR(-ENOMEM);
 597
 598         kref_init(&ev_file->ref);
 599         spin_lock_init(&ev_file->lock);
 600         INIT_LIST_HEAD(&ev_file->event_list);
 601         init_waitqueue_head(&ev_file->poll_wait);
 602         ev_file->uverbs_file = uverbs_file;
 603         kref_get(&ev_file->uverbs_file->ref);
 604         ev_file->async_queue = NULL;
 605         ev_file->is_closed   = 0;
 606
 607         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 608                                   ev_file, O_RDONLY);
 609         if (IS_ERR(filp))
 610                 goto err_put_refs;
 611
 612         mutex_lock(&uverbs_file->device->lists_mutex);
 613         list_add_tail(&ev_file->list,
 614                       &uverbs_file->device->uverbs_events_file_list);
 615         mutex_unlock(&uverbs_file->device->lists_mutex);
 616
 617         if (is_async) {
 618                 WARN_ON(uverbs_file->async_file);
 619                 uverbs_file->async_file = ev_file;
 620                 kref_get(&uverbs_file->async_file->ref);
 621                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 622                                       ib_dev,
 623                                       ib_uverbs_event_handler);
 624                 ret = ib_register_event_handler(&uverbs_file->event_handler);
 625                 if (ret)
 626                         goto err_put_file;
 627
 628                 /* At that point async file stuff was fully set */
 629                 ev_file->is_async = 1;
 630         }
 631
 632         return filp;
 633
 634 err_put_file:
 635         fput(filp);
 636         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
 637         uverbs_file->async_file = NULL;
 638         return ERR_PTR(ret);
 639
 640 err_put_refs:
 641         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 642         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 643         return filp;
 644 }
 645
 646 /*
 647  * Look up a completion event file by FD.  If lookup is successful,
 648  * takes a ref to the event file struct that it returns; if
 649  * unsuccessful, returns NULL.
 650  */
 651 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 652 {
 653         struct ib_uverbs_event_file *ev_file = NULL;
 654         struct fd f = fdget(fd);
 655
 656         if (!f.file)
 657                 return NULL;
 658
 659         if (f.file->f_op != &uverbs_event_fops)
 660                 goto out;
 661
 662         ev_file = f.file->private_data;
 663         if (ev_file->is_async) {
 664                 ev_file = NULL;
 665                 goto out;
 666         }
 667
 668         kref_get(&ev_file->ref);
 669
 670 out:
 671         fdput(f);
 672         return ev_file;
 673 }
 674
 675 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 676                              size_t count, loff_t *pos)
 677 {
 678         struct ib_uverbs_file *file = filp->private_data;
 679         struct ib_device *ib_dev;
 680         struct ib_uverbs_cmd_hdr hdr;
 681         __u32 flags;
 682         int srcu_key;
 683         ssize_t ret;
 684
 685         if (count < sizeof hdr)
 686                 return -EINVAL;
 687
 688         if (copy_from_user(&hdr, buf, sizeof hdr))
 689                 return -EFAULT;
 690
 691         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 692         ib_dev = srcu_dereference(file->device->ib_dev,
 693                                   &file->device->disassociate_srcu);
 694         if (!ib_dev) {
 695                 ret = -EIO;
 696                 goto out;
 697         }
 698
 699         flags = (hdr.command &
 700                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 701
 702         if (!flags) {
 703                 __u32 command;
 704
 705                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 706                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 707                         ret = -EINVAL;
 708                         goto out;
 709                 }
 710
 711                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 712
 713                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 714                     !uverbs_cmd_table[command]) {
 715                         ret = -EINVAL;
 716                         goto out;
 717                 }
 718
 719                 if (!file->ucontext &&
 720                     command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 721                         ret = -EINVAL;
 722                         goto out;
 723                 }
 724
 725                 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
 726                         ret = -ENOSYS;
 727                         goto out;
 728                 }
 729
 730                 if (hdr.in_words * 4 != count) {
 731                         ret = -EINVAL;
 732                         goto out;
 733                 }
 734
 735                 ret = uverbs_cmd_table[command](file, ib_dev,
 736                                                  buf + sizeof(hdr),
 737                                                  hdr.in_words * 4,
 738                                                  hdr.out_words * 4);
 739
 740         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 741                 __u32 command;
 742
 743                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 744                 struct ib_udata ucore;
 745                 struct ib_udata uhw;
 746                 size_t written_count = count;
 747
 748                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 749                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 750                         ret = -EINVAL;
 751                         goto out;
 752                 }
 753
 754                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 755
 756                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 757                     !uverbs_ex_cmd_table[command]) {
 758                         ret = -ENOSYS;
 759                         goto out;
 760                 }
 761
 762                 if (!file->ucontext) {
 763                         ret = -EINVAL;
 764                         goto out;
 765                 }
 766
 767                 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
 768                         ret = -ENOSYS;
 769                         goto out;
 770                 }
 771
 772                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 773                         ret = -EINVAL;
 774                         goto out;
 775                 }
 776
 777                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 778                         ret = -EFAULT;
 779                         goto out;
 780                 }
 781
 782                 count -= sizeof(hdr) + sizeof(ex_hdr);
 783                 buf += sizeof(hdr) + sizeof(ex_hdr);
 784
 785                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 786                         ret = -EINVAL;
 787                         goto out;
 788                 }
 789
 790                 if (ex_hdr.cmd_hdr_reserved) {
 791                         ret = -EINVAL;
 792                         goto out;
 793                 }
 794
 795                 if (ex_hdr.response) {
 796                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 797                                 ret = -EINVAL;
 798                                 goto out;
 799                         }
 800
 801                         if (!access_ok(VERIFY_WRITE,
 802                                        (void __user *) (unsigned long) ex_hdr.response,
 803                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 804                                 ret = -EFAULT;
 805                                 goto out;
 806                         }
 807                 } else {
 808                         if (hdr.out_words || ex_hdr.provider_out_words) {
 809                                 ret = -EINVAL;
 810                                 goto out;
 811                         }
 812                 }
 813
 814                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 815                                        hdr.in_words * 8, hdr.out_words * 8);
 816
 817                 INIT_UDATA_BUF_OR_NULL(&uhw,
 818                                        buf + ucore.inlen,
 819                                        (unsigned long) ex_hdr.response + ucore.outlen,
 820                                        ex_hdr.provider_in_words * 8,
 821                                        ex_hdr.provider_out_words * 8);
 822
 823                 ret = uverbs_ex_cmd_table[command](file,
 824                                                    ib_dev,
 825                                                    &ucore,
 826                                                    &uhw);
 827                 if (!ret)
 828                         ret = written_count;
 829         } else {
 830                 ret = -ENOSYS;
 831         }
 832
 833 out:
 834         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 835         return ret;
 836 }
 837
 838 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 839 {
 840         struct ib_uverbs_file *file = filp->private_data;
 841         struct ib_device *ib_dev;
 842         int ret = 0;
 843         int srcu_key;
 844
 845         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 846         ib_dev = srcu_dereference(file->device->ib_dev,
 847                                   &file->device->disassociate_srcu);
 848         if (!ib_dev) {
 849                 ret = -EIO;
 850                 goto out;
 851         }
 852
 853         if (!file->ucontext)
 854                 ret = -ENODEV;
 855         else
 856                 ret = ib_dev->mmap(file->ucontext, vma);
 857 out:
 858         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 859         return ret;
 860 }
 861
 862 /*
 863  * ib_uverbs_open() does not need the BKL:
 864  *
 865  *  - the ib_uverbs_device structures are properly reference counted and
 866  *    everything else is purely local to the file being created, so
 867  *    races against other open calls are not a problem;
 868  *  - there is no ioctl method to race against;
 869  *  - the open method will either immediately run -ENXIO, or all
 870  *    required initialization will be done.
 871  */
 872 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 873 {
 874         struct ib_uverbs_device *dev;
 875         struct ib_uverbs_file *file;
 876         struct ib_device *ib_dev;
 877         int ret;
 878         int module_dependent;
 879         int srcu_key;
 880
 881         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 882         if (!atomic_inc_not_zero(&dev->refcount))
 883                 return -ENXIO;
 884
 885         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 886         mutex_lock(&dev->lists_mutex);
 887         ib_dev = srcu_dereference(dev->ib_dev,
 888                                   &dev->disassociate_srcu);
 889         if (!ib_dev) {
 890                 ret = -EIO;
 891                 goto err;
 892         }
 893
 894         /* In case IB device supports disassociate ucontext, there is no hard
 895          * dependency between uverbs device and its low level device.
 896          */
 897         module_dependent = !(ib_dev->disassociate_ucontext);
 898
 899         if (module_dependent) {
 900                 if (!try_module_get(ib_dev->owner)) {
 901                         ret = -ENODEV;
 902                         goto err;
 903                 }
 904         }
 905
 906         file = kzalloc(sizeof(*file), GFP_KERNEL);
 907         if (!file) {
 908                 ret = -ENOMEM;
 909                 if (module_dependent)
 910                         goto err_module;
 911
 912                 goto err;
 913         }
 914
 915         file->device     = dev;
 916         file->ucontext   = NULL;
 917         file->async_file = NULL;
 918         kref_init(&file->ref);
 919         mutex_init(&file->mutex);
 920
 921         filp->private_data = file;
 922         kobject_get(&dev->kobj);
 923         list_add_tail(&file->list, &dev->uverbs_file_list);
 924         mutex_unlock(&dev->lists_mutex);
 925         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 926
 927         return nonseekable_open(inode, filp);
 928
 929 err_module:
 930         module_put(ib_dev->owner);
 931
 932 err:
 933         mutex_unlock(&dev->lists_mutex);
 934         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 935         if (atomic_dec_and_test(&dev->refcount))
 936                 ib_uverbs_comp_dev(dev);
 937
 938         return ret;
 939 }
 940
 941 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 942 {
 943         struct ib_uverbs_file *file = filp->private_data;
 944         struct ib_uverbs_device *dev = file->device;
 945         struct ib_ucontext *ucontext = NULL;
 946
 947         mutex_lock(&file->device->lists_mutex);
 948         ucontext = file->ucontext;
 949         file->ucontext = NULL;
 950         if (!file->is_closed) {
 951                 list_del(&file->list);
 952                 file->is_closed = 1;
 953         }
 954         mutex_unlock(&file->device->lists_mutex);
 955         if (ucontext)
 956                 ib_uverbs_cleanup_ucontext(file, ucontext);
 957
 958         if (file->async_file)
 959                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 960
 961         kref_put(&file->ref, ib_uverbs_release_file);
 962         kobject_put(&dev->kobj);
 963
 964         return 0;
 965 }
 966
 967 static const struct file_operations uverbs_fops = {
 968         .owner   = THIS_MODULE,
 969         .write   = ib_uverbs_write,
 970         .open    = ib_uverbs_open,
 971         .release = ib_uverbs_close,
 972         .llseek  = no_llseek,
 973 };
 974
 975 static const struct file_operations uverbs_mmap_fops = {
 976         .owner   = THIS_MODULE,
 977         .write   = ib_uverbs_write,
 978         .mmap    = ib_uverbs_mmap,
 979         .open    = ib_uverbs_open,
 980         .release = ib_uverbs_close,
 981         .llseek  = no_llseek,
 982 };
 983
 984 static struct ib_client uverbs_client = {
 985         .name   = "uverbs",
 986         .add    = ib_uverbs_add_one,
 987         .remove = ib_uverbs_remove_one
 988 };
 989
 990 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 991                           char *buf)
 992 {
 993         int ret = -ENODEV;
 994         int srcu_key;
 995         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 996         struct ib_device *ib_dev;
 997
 998         if (!dev)
 999                 return -ENODEV;
1000
1001         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1002         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1003         if (ib_dev)
1004                 ret = sprintf(buf, "%s\n", ib_dev->name);
1005         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1006
1007         return ret;
1008 }
1009 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1010
1011 static ssize_t show_dev_abi_version(struct device *device,
1012                                     struct device_attribute *attr, char *buf)
1013 {
1014         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1015         int ret = -ENODEV;
1016         int srcu_key;
1017         struct ib_device *ib_dev;
1018
1019         if (!dev)
1020                 return -ENODEV;
1021         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1022         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1023         if (ib_dev)
1024                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1025         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1026
1027         return ret;
1028 }
1029 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1030
1031 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1032                          __stringify(IB_USER_VERBS_ABI_VERSION));
1033
1034 static dev_t overflow_maj;
1035 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1036
1037 /*
1038  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1039  * requesting a new major number and doubling the number of max devices we
1040  * support. It's stupid, but simple.
1041  */
1042 static int find_overflow_devnum(void)
1043 {
1044         int ret;
1045
1046         if (!overflow_maj) {
1047                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1048                                           "infiniband_verbs");
1049                 if (ret) {
1050                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
1051                         return ret;
1052                 }
1053         }
1054
1055         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1056         if (ret >= IB_UVERBS_MAX_DEVICES)
1057                 return -1;
1058
1059         return ret;
1060 }
1061
1062 static void ib_uverbs_add_one(struct ib_device *device)
1063 {
1064         int devnum;
1065         dev_t base;
1066         struct ib_uverbs_device *uverbs_dev;
1067         int ret;
1068
1069         if (!device->alloc_ucontext)
1070                 return;
1071
1072         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1073         if (!uverbs_dev)
1074                 return;
1075
1076         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1077         if (ret) {
1078                 kfree(uverbs_dev);
1079                 return;
1080         }
1081
1082         atomic_set(&uverbs_dev->refcount, 1);
1083         init_completion(&uverbs_dev->comp);
1084         uverbs_dev->xrcd_tree = RB_ROOT;
1085         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1086         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1087         mutex_init(&uverbs_dev->lists_mutex);
1088         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1089         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1090
1091         spin_lock(&map_lock);
1092         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1093         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1094                 spin_unlock(&map_lock);
1095                 devnum = find_overflow_devnum();
1096                 if (devnum < 0)
1097                         goto err;
1098
1099                 spin_lock(&map_lock);
1100                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1101                 base = devnum + overflow_maj;
1102                 set_bit(devnum, overflow_map);
1103         } else {
1104                 uverbs_dev->devnum = devnum;
1105                 base = devnum + IB_UVERBS_BASE_DEV;
1106                 set_bit(devnum, dev_map);
1107         }
1108         spin_unlock(&map_lock);
1109
1110         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1111         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1112
1113         cdev_init(&uverbs_dev->cdev, NULL);
1114         uverbs_dev->cdev.owner = THIS_MODULE;
1115         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1116         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1117         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1118         if (cdev_add(&uverbs_dev->cdev, base, 1))
1119                 goto err_cdev;
1120
1121         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1122                                         uverbs_dev->cdev.dev, uverbs_dev,
1123                                         "uverbs%d", uverbs_dev->devnum);
1124         if (IS_ERR(uverbs_dev->dev))
1125                 goto err_cdev;
1126
1127         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1128                 goto err_class;
1129         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1130                 goto err_class;
1131
1132         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1133
1134         return;
1135
1136 err_class:
1137         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1138
1139 err_cdev:
1140         cdev_del(&uverbs_dev->cdev);
1141         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1142                 clear_bit(devnum, dev_map);
1143         else
1144                 clear_bit(devnum, overflow_map);
1145
1146 err:
1147         if (atomic_dec_and_test(&uverbs_dev->refcount))
1148                 ib_uverbs_comp_dev(uverbs_dev);
1149         wait_for_completion(&uverbs_dev->comp);
1150         kobject_put(&uverbs_dev->kobj);
1151         return;
1152 }
1153
1154 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1155                                         struct ib_device *ib_dev)
1156 {
1157         struct ib_uverbs_file *file;
1158         struct ib_uverbs_event_file *event_file;
1159         struct ib_event event;
1160
1161         /* Pending running commands to terminate */
1162         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1163         event.event = IB_EVENT_DEVICE_FATAL;
1164         event.element.port_num = 0;
1165         event.device = ib_dev;
1166
1167         mutex_lock(&uverbs_dev->lists_mutex);
1168         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1169                 struct ib_ucontext *ucontext;
1170
1171                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1172                                         struct ib_uverbs_file, list);
1173                 file->is_closed = 1;
1174                 ucontext = file->ucontext;
1175                 list_del(&file->list);
1176                 file->ucontext = NULL;
1177                 kref_get(&file->ref);
1178                 mutex_unlock(&uverbs_dev->lists_mutex);
1179                 /* We must release the mutex before going ahead and calling
1180                  * disassociate_ucontext. disassociate_ucontext might end up
1181                  * indirectly calling uverbs_close, for example due to freeing
1182                  * the resources (e.g mmput).
1183                  */
1184                 ib_uverbs_event_handler(&file->event_handler, &event);
1185                 if (ucontext) {
1186                         ib_dev->disassociate_ucontext(ucontext);
1187                         ib_uverbs_cleanup_ucontext(file, ucontext);
1188                 }
1189
1190                 mutex_lock(&uverbs_dev->lists_mutex);
1191                 kref_put(&file->ref, ib_uverbs_release_file);
1192         }
1193
1194         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1195                 event_file = list_first_entry(&uverbs_dev->
1196                                               uverbs_events_file_list,
1197                                               struct ib_uverbs_event_file,
1198                                               list);
1199                 spin_lock_irq(&event_file->lock);
1200                 event_file->is_closed = 1;
1201                 spin_unlock_irq(&event_file->lock);
1202
1203                 list_del(&event_file->list);
1204                 if (event_file->is_async) {
1205                         ib_unregister_event_handler(&event_file->uverbs_file->
1206                                                     event_handler);
1207                         event_file->uverbs_file->event_handler.device = NULL;
1208                 }
1209
1210                 wake_up_interruptible(&event_file->poll_wait);
1211                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1212         }
1213         mutex_unlock(&uverbs_dev->lists_mutex);
1214 }
1215
1216 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1217 {
1218         struct ib_uverbs_device *uverbs_dev = client_data;
1219         int wait_clients = 1;
1220
1221         if (!uverbs_dev)
1222                 return;
1223
1224         dev_set_drvdata(uverbs_dev->dev, NULL);
1225         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1226         cdev_del(&uverbs_dev->cdev);
1227
1228         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1229                 clear_bit(uverbs_dev->devnum, dev_map);
1230         else
1231                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1232
1233         if (device->disassociate_ucontext) {
1234                 /* We disassociate HW resources and immediately return.
1235                  * Userspace will see a EIO errno for all future access.
1236                  * Upon returning, ib_device may be freed internally and is not
1237                  * valid any more.
1238                  * uverbs_device is still available until all clients close
1239                  * their files, then the uverbs device ref count will be zero
1240                  * and its resources will be freed.
1241                  * Note: At this point no more files can be opened since the
1242                  * cdev was deleted, however active clients can still issue
1243                  * commands and close their open files.
1244                  */
1245                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1246                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1247                 wait_clients = 0;
1248         }
1249
1250         if (atomic_dec_and_test(&uverbs_dev->refcount))
1251                 ib_uverbs_comp_dev(uverbs_dev);
1252         if (wait_clients)
1253                 wait_for_completion(&uverbs_dev->comp);
1254         kobject_put(&uverbs_dev->kobj);
1255 }
1256
1257 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1258 {
1259         if (mode)
1260                 *mode = 0666;
1261         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1262 }
1263
1264 static int __init ib_uverbs_init(void)
1265 {
1266         int ret;
1267
1268         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1269                                      "infiniband_verbs");
1270         if (ret) {
1271                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1272                 goto out;
1273         }
1274
1275         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1276         if (IS_ERR(uverbs_class)) {
1277                 ret = PTR_ERR(uverbs_class);
1278                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1279                 goto out_chrdev;
1280         }
1281
1282         uverbs_class->devnode = uverbs_devnode;
1283
1284         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1285         if (ret) {
1286                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1287                 goto out_class;
1288         }
1289
1290         ret = ib_register_client(&uverbs_client);
1291         if (ret) {
1292                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1293                 goto out_class;
1294         }
1295
1296         return 0;
1297
1298 out_class:
1299         class_destroy(uverbs_class);
1300
1301 out_chrdev:
1302         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1303
1304 out:
1305         return ret;
1306 }
1307
1308 static void __exit ib_uverbs_cleanup(void)
1309 {
1310         ib_unregister_client(&uverbs_client);
1311         class_destroy(uverbs_class);
1312         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1313         if (overflow_maj)
1314                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1315         idr_destroy(&ib_uverbs_pd_idr);
1316         idr_destroy(&ib_uverbs_mr_idr);
1317         idr_destroy(&ib_uverbs_mw_idr);
1318         idr_destroy(&ib_uverbs_ah_idr);
1319         idr_destroy(&ib_uverbs_cq_idr);
1320         idr_destroy(&ib_uverbs_qp_idr);
1321         idr_destroy(&ib_uverbs_srq_idr);
1322 }
1323
1324 module_init(ib_uverbs_init);
1325 module_exit(ib_uverbs_cleanup);