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 <rdma/ib.h>
  52
  53 #include "uverbs.h"
  54
  55 MODULE_AUTHOR("Roland Dreier");
  56 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  57 MODULE_LICENSE("Dual BSD/GPL");
  58
  59 enum {
  60         IB_UVERBS_MAJOR       = 231,
  61         IB_UVERBS_BASE_MINOR  = 192,
  62         IB_UVERBS_MAX_DEVICES = 32
  63 };
  64
  65 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  66
  67 static struct class *uverbs_class;
  68
  69 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  70 DEFINE_IDR(ib_uverbs_pd_idr);
  71 DEFINE_IDR(ib_uverbs_mr_idr);
  72 DEFINE_IDR(ib_uverbs_mw_idr);
  73 DEFINE_IDR(ib_uverbs_ah_idr);
  74 DEFINE_IDR(ib_uverbs_cq_idr);
  75 DEFINE_IDR(ib_uverbs_qp_idr);
  76 DEFINE_IDR(ib_uverbs_srq_idr);
  77 DEFINE_IDR(ib_uverbs_xrcd_idr);
  78 DEFINE_IDR(ib_uverbs_rule_idr);
  79
  80 static DEFINE_SPINLOCK(map_lock);
  81 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  82
  83 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  84                                      struct ib_device *ib_dev,
  85                                      const char __user *buf, int in_len,
  86                                      int out_len) = {
  87         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  88         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  89         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  90         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  91         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  92         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  93         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  94         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  95         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  96         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  97         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  98         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  99         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
 100         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
 101         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 102         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
 103         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 104         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 105         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 106         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 107         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 108         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 109         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 110         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 111         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 112         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 113         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 114         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 115         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 116         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 117         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 118         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 119         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 120         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 121         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 122 };
 123
 124 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 125                                     struct ib_device *ib_dev,
 126                                     struct ib_udata *ucore,
 127                                     struct ib_udata *uhw) = {
 128         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 129         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 130         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 131         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 132         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 133 };
 134
 135 static void ib_uverbs_add_one(struct ib_device *device);
 136 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 137
 138 static void ib_uverbs_release_dev(struct kobject *kobj)
 139 {
 140         struct ib_uverbs_device *dev =
 141                 container_of(kobj, struct ib_uverbs_device, kobj);
 142
 143         cleanup_srcu_struct(&dev->disassociate_srcu);
 144         kfree(dev);
 145 }
 146
 147 static struct kobj_type ib_uverbs_dev_ktype = {
 148         .release = ib_uverbs_release_dev,
 149 };
 150
 151 static void ib_uverbs_release_event_file(struct kref *ref)
 152 {
 153         struct ib_uverbs_event_file *file =
 154                 container_of(ref, struct ib_uverbs_event_file, ref);
 155
 156         kfree(file);
 157 }
 158
 159 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 160                           struct ib_uverbs_event_file *ev_file,
 161                           struct ib_ucq_object *uobj)
 162 {
 163         struct ib_uverbs_event *evt, *tmp;
 164
 165         if (ev_file) {
 166                 spin_lock_irq(&ev_file->lock);
 167                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 168                         list_del(&evt->list);
 169                         kfree(evt);
 170                 }
 171                 spin_unlock_irq(&ev_file->lock);
 172
 173                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 174         }
 175
 176         spin_lock_irq(&file->async_file->lock);
 177         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 178                 list_del(&evt->list);
 179                 kfree(evt);
 180         }
 181         spin_unlock_irq(&file->async_file->lock);
 182 }
 183
 184 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 185                               struct ib_uevent_object *uobj)
 186 {
 187         struct ib_uverbs_event *evt, *tmp;
 188
 189         spin_lock_irq(&file->async_file->lock);
 190         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 191                 list_del(&evt->list);
 192                 kfree(evt);
 193         }
 194         spin_unlock_irq(&file->async_file->lock);
 195 }
 196
 197 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 198                                     struct ib_uqp_object *uobj)
 199 {
 200         struct ib_uverbs_mcast_entry *mcast, *tmp;
 201
 202         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 203                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 204                 list_del(&mcast->list);
 205                 kfree(mcast);
 206         }
 207 }
 208
 209 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 210                                       struct ib_ucontext *context)
 211 {
 212         struct ib_uobject *uobj, *tmp;
 213
 214         context->closing = 1;
 215
 216         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 217                 struct ib_ah *ah = uobj->object;
 218
 219                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 220                 ib_destroy_ah(ah);
 221                 kfree(uobj);
 222         }
 223
 224         /* Remove MWs before QPs, in order to support type 2A MWs. */
 225         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 226                 struct ib_mw *mw = uobj->object;
 227
 228                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 229                 ib_dealloc_mw(mw);
 230                 kfree(uobj);
 231         }
 232
 233         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 234                 struct ib_flow *flow_id = uobj->object;
 235
 236                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 237                 ib_destroy_flow(flow_id);
 238                 kfree(uobj);
 239         }
 240
 241         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 242                 struct ib_qp *qp = uobj->object;
 243                 struct ib_uqp_object *uqp =
 244                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 245
 246                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 247                 if (qp != qp->real_qp) {
 248                         ib_close_qp(qp);
 249                 } else {
 250                         ib_uverbs_detach_umcast(qp, uqp);
 251                         ib_destroy_qp(qp);
 252                 }
 253                 ib_uverbs_release_uevent(file, &uqp->uevent);
 254                 kfree(uqp);
 255         }
 256
 257         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 258                 struct ib_srq *srq = uobj->object;
 259                 struct ib_uevent_object *uevent =
 260                         container_of(uobj, struct ib_uevent_object, uobject);
 261
 262                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 263                 ib_destroy_srq(srq);
 264                 ib_uverbs_release_uevent(file, uevent);
 265                 kfree(uevent);
 266         }
 267
 268         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 269                 struct ib_cq *cq = uobj->object;
 270                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 271                 struct ib_ucq_object *ucq =
 272                         container_of(uobj, struct ib_ucq_object, uobject);
 273
 274                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 275                 ib_destroy_cq(cq);
 276                 ib_uverbs_release_ucq(file, ev_file, ucq);
 277                 kfree(ucq);
 278         }
 279
 280         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 281                 struct ib_mr *mr = uobj->object;
 282
 283                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 284                 ib_dereg_mr(mr);
 285                 kfree(uobj);
 286         }
 287
 288         mutex_lock(&file->device->xrcd_tree_mutex);
 289         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 290                 struct ib_xrcd *xrcd = uobj->object;
 291                 struct ib_uxrcd_object *uxrcd =
 292                         container_of(uobj, struct ib_uxrcd_object, uobject);
 293
 294                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 295                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 296                 kfree(uxrcd);
 297         }
 298         mutex_unlock(&file->device->xrcd_tree_mutex);
 299
 300         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 301                 struct ib_pd *pd = uobj->object;
 302
 303                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 304                 ib_dealloc_pd(pd);
 305                 kfree(uobj);
 306         }
 307
 308         put_pid(context->tgid);
 309
 310         return context->device->dealloc_ucontext(context);
 311 }
 312
 313 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 314 {
 315         complete(&dev->comp);
 316 }
 317
 318 static void ib_uverbs_release_file(struct kref *ref)
 319 {
 320         struct ib_uverbs_file *file =
 321                 container_of(ref, struct ib_uverbs_file, ref);
 322         struct ib_device *ib_dev;
 323         int srcu_key;
 324
 325         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 326         ib_dev = srcu_dereference(file->device->ib_dev,
 327                                   &file->device->disassociate_srcu);
 328         if (ib_dev && !ib_dev->disassociate_ucontext)
 329                 module_put(ib_dev->owner);
 330         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 331
 332         if (atomic_dec_and_test(&file->device->refcount))
 333                 ib_uverbs_comp_dev(file->device);
 334
 335         kfree(file);
 336 }
 337
 338 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 339                                     size_t count, loff_t *pos)
 340 {
 341         struct ib_uverbs_event_file *file = filp->private_data;
 342         struct ib_uverbs_event *event;
 343         int eventsz;
 344         int ret = 0;
 345
 346         spin_lock_irq(&file->lock);
 347
 348         while (list_empty(&file->event_list)) {
 349                 spin_unlock_irq(&file->lock);
 350
 351                 if (filp->f_flags & O_NONBLOCK)
 352                         return -EAGAIN;
 353
 354                 if (wait_event_interruptible(file->poll_wait,
 355                                              (!list_empty(&file->event_list) ||
 356                         /* The barriers built into wait_event_interruptible()
 357                          * and wake_up() guarentee this will see the null set
 358                          * without using RCU
 359                          */
 360                                              !file->uverbs_file->device->ib_dev)))
 361                         return -ERESTARTSYS;
 362
 363                 /* If device was disassociated and no event exists set an error */
 364                 if (list_empty(&file->event_list) &&
 365                     !file->uverbs_file->device->ib_dev)
 366                         return -EIO;
 367
 368                 spin_lock_irq(&file->lock);
 369         }
 370
 371         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 372
 373         if (file->is_async)
 374                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 375         else
 376                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 377
 378         if (eventsz > count) {
 379                 ret   = -EINVAL;
 380                 event = NULL;
 381         } else {
 382                 list_del(file->event_list.next);
 383                 if (event->counter) {
 384                         ++(*event->counter);
 385                         list_del(&event->obj_list);
 386                 }
 387         }
 388
 389         spin_unlock_irq(&file->lock);
 390
 391         if (event) {
 392                 if (copy_to_user(buf, event, eventsz))
 393                         ret = -EFAULT;
 394                 else
 395                         ret = eventsz;
 396         }
 397
 398         kfree(event);
 399
 400         return ret;
 401 }
 402
 403 static unsigned int ib_uverbs_event_poll(struct file *filp,
 404                                          struct poll_table_struct *wait)
 405 {
 406         unsigned int pollflags = 0;
 407         struct ib_uverbs_event_file *file = filp->private_data;
 408
 409         poll_wait(filp, &file->poll_wait, wait);
 410
 411         spin_lock_irq(&file->lock);
 412         if (!list_empty(&file->event_list))
 413                 pollflags = POLLIN | POLLRDNORM;
 414         spin_unlock_irq(&file->lock);
 415
 416         return pollflags;
 417 }
 418
 419 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 420 {
 421         struct ib_uverbs_event_file *file = filp->private_data;
 422
 423         return fasync_helper(fd, filp, on, &file->async_queue);
 424 }
 425
 426 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 427 {
 428         struct ib_uverbs_event_file *file = filp->private_data;
 429         struct ib_uverbs_event *entry, *tmp;
 430         int closed_already = 0;
 431
 432         mutex_lock(&file->uverbs_file->device->lists_mutex);
 433         spin_lock_irq(&file->lock);
 434         closed_already = file->is_closed;
 435         file->is_closed = 1;
 436         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 437                 if (entry->counter)
 438                         list_del(&entry->obj_list);
 439                 kfree(entry);
 440         }
 441         spin_unlock_irq(&file->lock);
 442         if (!closed_already) {
 443                 list_del(&file->list);
 444                 if (file->is_async)
 445                         ib_unregister_event_handler(&file->uverbs_file->
 446                                 event_handler);
 447         }
 448         mutex_unlock(&file->uverbs_file->device->lists_mutex);
 449
 450         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 451         kref_put(&file->ref, ib_uverbs_release_event_file);
 452
 453         return 0;
 454 }
 455
 456 static const struct file_operations uverbs_event_fops = {
 457         .owner   = THIS_MODULE,
 458         .read    = ib_uverbs_event_read,
 459         .poll    = ib_uverbs_event_poll,
 460         .release = ib_uverbs_event_close,
 461         .fasync  = ib_uverbs_event_fasync,
 462         .llseek  = no_llseek,
 463 };
 464
 465 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 466 {
 467         struct ib_uverbs_event_file    *file = cq_context;
 468         struct ib_ucq_object           *uobj;
 469         struct ib_uverbs_event         *entry;
 470         unsigned long                   flags;
 471
 472         if (!file)
 473                 return;
 474
 475         spin_lock_irqsave(&file->lock, flags);
 476         if (file->is_closed) {
 477                 spin_unlock_irqrestore(&file->lock, flags);
 478                 return;
 479         }
 480
 481         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 482         if (!entry) {
 483                 spin_unlock_irqrestore(&file->lock, flags);
 484                 return;
 485         }
 486
 487         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 488
 489         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 490         entry->counter             = &uobj->comp_events_reported;
 491
 492         list_add_tail(&entry->list, &file->event_list);
 493         list_add_tail(&entry->obj_list, &uobj->comp_list);
 494         spin_unlock_irqrestore(&file->lock, flags);
 495
 496         wake_up_interruptible(&file->poll_wait);
 497         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 498 }
 499
 500 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 501                                     __u64 element, __u64 event,
 502                                     struct list_head *obj_list,
 503                                     u32 *counter)
 504 {
 505         struct ib_uverbs_event *entry;
 506         unsigned long flags;
 507
 508         spin_lock_irqsave(&file->async_file->lock, flags);
 509         if (file->async_file->is_closed) {
 510                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 511                 return;
 512         }
 513
 514         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 515         if (!entry) {
 516                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 517                 return;
 518         }
 519
 520         entry->desc.async.element    = element;
 521         entry->desc.async.event_type = event;
 522         entry->desc.async.reserved   = 0;
 523         entry->counter               = counter;
 524
 525         list_add_tail(&entry->list, &file->async_file->event_list);
 526         if (obj_list)
 527                 list_add_tail(&entry->obj_list, obj_list);
 528         spin_unlock_irqrestore(&file->async_file->lock, flags);
 529
 530         wake_up_interruptible(&file->async_file->poll_wait);
 531         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 532 }
 533
 534 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 535 {
 536         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 537                                                   struct ib_ucq_object, uobject);
 538
 539         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 540                                 event->event, &uobj->async_list,
 541                                 &uobj->async_events_reported);
 542 }
 543
 544 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 545 {
 546         struct ib_uevent_object *uobj;
 547
 548         /* for XRC target qp's, check that qp is live */
 549         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
 550                 return;
 551
 552         uobj = container_of(event->element.qp->uobject,
 553                             struct ib_uevent_object, uobject);
 554
 555         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 556                                 event->event, &uobj->event_list,
 557                                 &uobj->events_reported);
 558 }
 559
 560 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 561 {
 562         struct ib_uevent_object *uobj;
 563
 564         uobj = container_of(event->element.srq->uobject,
 565                             struct ib_uevent_object, uobject);
 566
 567         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 568                                 event->event, &uobj->event_list,
 569                                 &uobj->events_reported);
 570 }
 571
 572 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 573                              struct ib_event *event)
 574 {
 575         struct ib_uverbs_file *file =
 576                 container_of(handler, struct ib_uverbs_file, event_handler);
 577
 578         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 579                                 NULL, NULL);
 580 }
 581
 582 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 583 {
 584         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 585         file->async_file = NULL;
 586 }
 587
 588 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 589                                         struct ib_device        *ib_dev,
 590                                         int is_async)
 591 {
 592         struct ib_uverbs_event_file *ev_file;
 593         struct file *filp;
 594         int ret;
 595
 596         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 597         if (!ev_file)
 598                 return ERR_PTR(-ENOMEM);
 599
 600         kref_init(&ev_file->ref);
 601         spin_lock_init(&ev_file->lock);
 602         INIT_LIST_HEAD(&ev_file->event_list);
 603         init_waitqueue_head(&ev_file->poll_wait);
 604         ev_file->uverbs_file = uverbs_file;
 605         kref_get(&ev_file->uverbs_file->ref);
 606         ev_file->async_queue = NULL;
 607         ev_file->is_closed   = 0;
 608
 609         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 610                                   ev_file, O_RDONLY);
 611         if (IS_ERR(filp))
 612                 goto err_put_refs;
 613
 614         mutex_lock(&uverbs_file->device->lists_mutex);
 615         list_add_tail(&ev_file->list,
 616                       &uverbs_file->device->uverbs_events_file_list);
 617         mutex_unlock(&uverbs_file->device->lists_mutex);
 618
 619         if (is_async) {
 620                 WARN_ON(uverbs_file->async_file);
 621                 uverbs_file->async_file = ev_file;
 622                 kref_get(&uverbs_file->async_file->ref);
 623                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 624                                       ib_dev,
 625                                       ib_uverbs_event_handler);
 626                 ret = ib_register_event_handler(&uverbs_file->event_handler);
 627                 if (ret)
 628                         goto err_put_file;
 629
 630                 /* At that point async file stuff was fully set */
 631                 ev_file->is_async = 1;
 632         }
 633
 634         return filp;
 635
 636 err_put_file:
 637         fput(filp);
 638         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
 639         uverbs_file->async_file = NULL;
 640         return ERR_PTR(ret);
 641
 642 err_put_refs:
 643         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 644         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 645         return filp;
 646 }
 647
 648 /*
 649  * Look up a completion event file by FD.  If lookup is successful,
 650  * takes a ref to the event file struct that it returns; if
 651  * unsuccessful, returns NULL.
 652  */
 653 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 654 {
 655         struct ib_uverbs_event_file *ev_file = NULL;
 656         struct fd f = fdget(fd);
 657
 658         if (!f.file)
 659                 return NULL;
 660
 661         if (f.file->f_op != &uverbs_event_fops)
 662                 goto out;
 663
 664         ev_file = f.file->private_data;
 665         if (ev_file->is_async) {
 666                 ev_file = NULL;
 667                 goto out;
 668         }
 669
 670         kref_get(&ev_file->ref);
 671
 672 out:
 673         fdput(f);
 674         return ev_file;
 675 }
 676
 677 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 678                              size_t count, loff_t *pos)
 679 {
 680         struct ib_uverbs_file *file = filp->private_data;
 681         struct ib_device *ib_dev;
 682         struct ib_uverbs_cmd_hdr hdr;
 683         __u32 flags;
 684         int srcu_key;
 685         ssize_t ret;
 686
 687         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
 688                 return -EACCES;
 689
 690         if (count < sizeof hdr)
 691                 return -EINVAL;
 692
 693         if (copy_from_user(&hdr, buf, sizeof hdr))
 694                 return -EFAULT;
 695
 696         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 697         ib_dev = srcu_dereference(file->device->ib_dev,
 698                                   &file->device->disassociate_srcu);
 699         if (!ib_dev) {
 700                 ret = -EIO;
 701                 goto out;
 702         }
 703
 704         flags = (hdr.command &
 705                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 706
 707         if (!flags) {
 708                 __u32 command;
 709
 710                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 711                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 712                         ret = -EINVAL;
 713                         goto out;
 714                 }
 715
 716                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 717
 718                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 719                     !uverbs_cmd_table[command]) {
 720                         ret = -EINVAL;
 721                         goto out;
 722                 }
 723
 724                 if (!file->ucontext &&
 725                     command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 726                         ret = -EINVAL;
 727                         goto out;
 728                 }
 729
 730                 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
 731                         ret = -ENOSYS;
 732                         goto out;
 733                 }
 734
 735                 if (hdr.in_words * 4 != count) {
 736                         ret = -EINVAL;
 737                         goto out;
 738                 }
 739
 740                 ret = uverbs_cmd_table[command](file, ib_dev,
 741                                                  buf + sizeof(hdr),
 742                                                  hdr.in_words * 4,
 743                                                  hdr.out_words * 4);
 744
 745         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 746                 __u32 command;
 747
 748                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 749                 struct ib_udata ucore;
 750                 struct ib_udata uhw;
 751                 size_t written_count = count;
 752
 753                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 754                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 755                         ret = -EINVAL;
 756                         goto out;
 757                 }
 758
 759                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 760
 761                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 762                     !uverbs_ex_cmd_table[command]) {
 763                         ret = -ENOSYS;
 764                         goto out;
 765                 }
 766
 767                 if (!file->ucontext) {
 768                         ret = -EINVAL;
 769                         goto out;
 770                 }
 771
 772                 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
 773                         ret = -ENOSYS;
 774                         goto out;
 775                 }
 776
 777                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 778                         ret = -EINVAL;
 779                         goto out;
 780                 }
 781
 782                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 783                         ret = -EFAULT;
 784                         goto out;
 785                 }
 786
 787                 count -= sizeof(hdr) + sizeof(ex_hdr);
 788                 buf += sizeof(hdr) + sizeof(ex_hdr);
 789
 790                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 791                         ret = -EINVAL;
 792                         goto out;
 793                 }
 794
 795                 if (ex_hdr.cmd_hdr_reserved) {
 796                         ret = -EINVAL;
 797                         goto out;
 798                 }
 799
 800                 if (ex_hdr.response) {
 801                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 802                                 ret = -EINVAL;
 803                                 goto out;
 804                         }
 805
 806                         if (!access_ok(VERIFY_WRITE,
 807                                        (void __user *) (unsigned long) ex_hdr.response,
 808                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 809                                 ret = -EFAULT;
 810                                 goto out;
 811                         }
 812                 } else {
 813                         if (hdr.out_words || ex_hdr.provider_out_words) {
 814                                 ret = -EINVAL;
 815                                 goto out;
 816                         }
 817                 }
 818
 819                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 820                                        hdr.in_words * 8, hdr.out_words * 8);
 821
 822                 INIT_UDATA_BUF_OR_NULL(&uhw,
 823                                        buf + ucore.inlen,
 824                                        (unsigned long) ex_hdr.response + ucore.outlen,
 825                                        ex_hdr.provider_in_words * 8,
 826                                        ex_hdr.provider_out_words * 8);
 827
 828                 ret = uverbs_ex_cmd_table[command](file,
 829                                                    ib_dev,
 830                                                    &ucore,
 831                                                    &uhw);
 832                 if (!ret)
 833                         ret = written_count;
 834         } else {
 835                 ret = -ENOSYS;
 836         }
 837
 838 out:
 839         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 840         return ret;
 841 }
 842
 843 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 844 {
 845         struct ib_uverbs_file *file = filp->private_data;
 846         struct ib_device *ib_dev;
 847         int ret = 0;
 848         int srcu_key;
 849
 850         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 851         ib_dev = srcu_dereference(file->device->ib_dev,
 852                                   &file->device->disassociate_srcu);
 853         if (!ib_dev) {
 854                 ret = -EIO;
 855                 goto out;
 856         }
 857
 858         if (!file->ucontext)
 859                 ret = -ENODEV;
 860         else
 861                 ret = ib_dev->mmap(file->ucontext, vma);
 862 out:
 863         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 864         return ret;
 865 }
 866
 867 /*
 868  * ib_uverbs_open() does not need the BKL:
 869  *
 870  *  - the ib_uverbs_device structures are properly reference counted and
 871  *    everything else is purely local to the file being created, so
 872  *    races against other open calls are not a problem;
 873  *  - there is no ioctl method to race against;
 874  *  - the open method will either immediately run -ENXIO, or all
 875  *    required initialization will be done.
 876  */
 877 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 878 {
 879         struct ib_uverbs_device *dev;
 880         struct ib_uverbs_file *file;
 881         struct ib_device *ib_dev;
 882         int ret;
 883         int module_dependent;
 884         int srcu_key;
 885
 886         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 887         if (!atomic_inc_not_zero(&dev->refcount))
 888                 return -ENXIO;
 889
 890         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 891         mutex_lock(&dev->lists_mutex);
 892         ib_dev = srcu_dereference(dev->ib_dev,
 893                                   &dev->disassociate_srcu);
 894         if (!ib_dev) {
 895                 ret = -EIO;
 896                 goto err;
 897         }
 898
 899         /* In case IB device supports disassociate ucontext, there is no hard
 900          * dependency between uverbs device and its low level device.
 901          */
 902         module_dependent = !(ib_dev->disassociate_ucontext);
 903
 904         if (module_dependent) {
 905                 if (!try_module_get(ib_dev->owner)) {
 906                         ret = -ENODEV;
 907                         goto err;
 908                 }
 909         }
 910
 911         file = kzalloc(sizeof(*file), GFP_KERNEL);
 912         if (!file) {
 913                 ret = -ENOMEM;
 914                 if (module_dependent)
 915                         goto err_module;
 916
 917                 goto err;
 918         }
 919
 920         file->device     = dev;
 921         file->ucontext   = NULL;
 922         file->async_file = NULL;
 923         kref_init(&file->ref);
 924         mutex_init(&file->mutex);
 925
 926         filp->private_data = file;
 927         kobject_get(&dev->kobj);
 928         list_add_tail(&file->list, &dev->uverbs_file_list);
 929         mutex_unlock(&dev->lists_mutex);
 930         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 931
 932         return nonseekable_open(inode, filp);
 933
 934 err_module:
 935         module_put(ib_dev->owner);
 936
 937 err:
 938         mutex_unlock(&dev->lists_mutex);
 939         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 940         if (atomic_dec_and_test(&dev->refcount))
 941                 ib_uverbs_comp_dev(dev);
 942
 943         return ret;
 944 }
 945
 946 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 947 {
 948         struct ib_uverbs_file *file = filp->private_data;
 949         struct ib_uverbs_device *dev = file->device;
 950         struct ib_ucontext *ucontext = NULL;
 951
 952         mutex_lock(&file->device->lists_mutex);
 953         ucontext = file->ucontext;
 954         file->ucontext = NULL;
 955         if (!file->is_closed) {
 956                 list_del(&file->list);
 957                 file->is_closed = 1;
 958         }
 959         mutex_unlock(&file->device->lists_mutex);
 960         if (ucontext)
 961                 ib_uverbs_cleanup_ucontext(file, ucontext);
 962
 963         if (file->async_file)
 964                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 965
 966         kref_put(&file->ref, ib_uverbs_release_file);
 967         kobject_put(&dev->kobj);
 968
 969         return 0;
 970 }
 971
 972 static const struct file_operations uverbs_fops = {
 973         .owner   = THIS_MODULE,
 974         .write   = ib_uverbs_write,
 975         .open    = ib_uverbs_open,
 976         .release = ib_uverbs_close,
 977         .llseek  = no_llseek,
 978 };
 979
 980 static const struct file_operations uverbs_mmap_fops = {
 981         .owner   = THIS_MODULE,
 982         .write   = ib_uverbs_write,
 983         .mmap    = ib_uverbs_mmap,
 984         .open    = ib_uverbs_open,
 985         .release = ib_uverbs_close,
 986         .llseek  = no_llseek,
 987 };
 988
 989 static struct ib_client uverbs_client = {
 990         .name   = "uverbs",
 991         .add    = ib_uverbs_add_one,
 992         .remove = ib_uverbs_remove_one
 993 };
 994
 995 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 996                           char *buf)
 997 {
 998         int ret = -ENODEV;
 999         int srcu_key;
1000         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1001         struct ib_device *ib_dev;
1002
1003         if (!dev)
1004                 return -ENODEV;
1005
1006         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1007         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1008         if (ib_dev)
1009                 ret = sprintf(buf, "%s\n", ib_dev->name);
1010         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1011
1012         return ret;
1013 }
1014 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1015
1016 static ssize_t show_dev_abi_version(struct device *device,
1017                                     struct device_attribute *attr, char *buf)
1018 {
1019         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1020         int ret = -ENODEV;
1021         int srcu_key;
1022         struct ib_device *ib_dev;
1023
1024         if (!dev)
1025                 return -ENODEV;
1026         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1027         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1028         if (ib_dev)
1029                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1030         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1031
1032         return ret;
1033 }
1034 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1035
1036 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1037                          __stringify(IB_USER_VERBS_ABI_VERSION));
1038
1039 static dev_t overflow_maj;
1040 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1041
1042 /*
1043  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1044  * requesting a new major number and doubling the number of max devices we
1045  * support. It's stupid, but simple.
1046  */
1047 static int find_overflow_devnum(void)
1048 {
1049         int ret;
1050
1051         if (!overflow_maj) {
1052                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1053                                           "infiniband_verbs");
1054                 if (ret) {
1055                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
1056                         return ret;
1057                 }
1058         }
1059
1060         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1061         if (ret >= IB_UVERBS_MAX_DEVICES)
1062                 return -1;
1063
1064         return ret;
1065 }
1066
1067 static void ib_uverbs_add_one(struct ib_device *device)
1068 {
1069         int devnum;
1070         dev_t base;
1071         struct ib_uverbs_device *uverbs_dev;
1072         int ret;
1073
1074         if (!device->alloc_ucontext)
1075                 return;
1076
1077         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1078         if (!uverbs_dev)
1079                 return;
1080
1081         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1082         if (ret) {
1083                 kfree(uverbs_dev);
1084                 return;
1085         }
1086
1087         atomic_set(&uverbs_dev->refcount, 1);
1088         init_completion(&uverbs_dev->comp);
1089         uverbs_dev->xrcd_tree = RB_ROOT;
1090         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1091         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1092         mutex_init(&uverbs_dev->lists_mutex);
1093         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1094         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1095
1096         spin_lock(&map_lock);
1097         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1098         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1099                 spin_unlock(&map_lock);
1100                 devnum = find_overflow_devnum();
1101                 if (devnum < 0)
1102                         goto err;
1103
1104                 spin_lock(&map_lock);
1105                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1106                 base = devnum + overflow_maj;
1107                 set_bit(devnum, overflow_map);
1108         } else {
1109                 uverbs_dev->devnum = devnum;
1110                 base = devnum + IB_UVERBS_BASE_DEV;
1111                 set_bit(devnum, dev_map);
1112         }
1113         spin_unlock(&map_lock);
1114
1115         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1116         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1117
1118         cdev_init(&uverbs_dev->cdev, NULL);
1119         uverbs_dev->cdev.owner = THIS_MODULE;
1120         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1121         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1122         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1123         if (cdev_add(&uverbs_dev->cdev, base, 1))
1124                 goto err_cdev;
1125
1126         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1127                                         uverbs_dev->cdev.dev, uverbs_dev,
1128                                         "uverbs%d", uverbs_dev->devnum);
1129         if (IS_ERR(uverbs_dev->dev))
1130                 goto err_cdev;
1131
1132         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1133                 goto err_class;
1134         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1135                 goto err_class;
1136
1137         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1138
1139         return;
1140
1141 err_class:
1142         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1143
1144 err_cdev:
1145         cdev_del(&uverbs_dev->cdev);
1146         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1147                 clear_bit(devnum, dev_map);
1148         else
1149                 clear_bit(devnum, overflow_map);
1150
1151 err:
1152         if (atomic_dec_and_test(&uverbs_dev->refcount))
1153                 ib_uverbs_comp_dev(uverbs_dev);
1154         wait_for_completion(&uverbs_dev->comp);
1155         kobject_put(&uverbs_dev->kobj);
1156         return;
1157 }
1158
1159 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1160                                         struct ib_device *ib_dev)
1161 {
1162         struct ib_uverbs_file *file;
1163         struct ib_uverbs_event_file *event_file;
1164         struct ib_event event;
1165
1166         /* Pending running commands to terminate */
1167         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1168         event.event = IB_EVENT_DEVICE_FATAL;
1169         event.element.port_num = 0;
1170         event.device = ib_dev;
1171
1172         mutex_lock(&uverbs_dev->lists_mutex);
1173         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1174                 struct ib_ucontext *ucontext;
1175
1176                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1177                                         struct ib_uverbs_file, list);
1178                 file->is_closed = 1;
1179                 ucontext = file->ucontext;
1180                 list_del(&file->list);
1181                 file->ucontext = NULL;
1182                 kref_get(&file->ref);
1183                 mutex_unlock(&uverbs_dev->lists_mutex);
1184                 /* We must release the mutex before going ahead and calling
1185                  * disassociate_ucontext. disassociate_ucontext might end up
1186                  * indirectly calling uverbs_close, for example due to freeing
1187                  * the resources (e.g mmput).
1188                  */
1189                 ib_uverbs_event_handler(&file->event_handler, &event);
1190                 if (ucontext) {
1191                         ib_dev->disassociate_ucontext(ucontext);
1192                         ib_uverbs_cleanup_ucontext(file, ucontext);
1193                 }
1194
1195                 mutex_lock(&uverbs_dev->lists_mutex);
1196                 kref_put(&file->ref, ib_uverbs_release_file);
1197         }
1198
1199         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1200                 event_file = list_first_entry(&uverbs_dev->
1201                                               uverbs_events_file_list,
1202                                               struct ib_uverbs_event_file,
1203                                               list);
1204                 spin_lock_irq(&event_file->lock);
1205                 event_file->is_closed = 1;
1206                 spin_unlock_irq(&event_file->lock);
1207
1208                 list_del(&event_file->list);
1209                 if (event_file->is_async) {
1210                         ib_unregister_event_handler(&event_file->uverbs_file->
1211                                                     event_handler);
1212                         event_file->uverbs_file->event_handler.device = NULL;
1213                 }
1214
1215                 wake_up_interruptible(&event_file->poll_wait);
1216                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1217         }
1218         mutex_unlock(&uverbs_dev->lists_mutex);
1219 }
1220
1221 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1222 {
1223         struct ib_uverbs_device *uverbs_dev = client_data;
1224         int wait_clients = 1;
1225
1226         if (!uverbs_dev)
1227                 return;
1228
1229         dev_set_drvdata(uverbs_dev->dev, NULL);
1230         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1231         cdev_del(&uverbs_dev->cdev);
1232
1233         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1234                 clear_bit(uverbs_dev->devnum, dev_map);
1235         else
1236                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1237
1238         if (device->disassociate_ucontext) {
1239                 /* We disassociate HW resources and immediately return.
1240                  * Userspace will see a EIO errno for all future access.
1241                  * Upon returning, ib_device may be freed internally and is not
1242                  * valid any more.
1243                  * uverbs_device is still available until all clients close
1244                  * their files, then the uverbs device ref count will be zero
1245                  * and its resources will be freed.
1246                  * Note: At this point no more files can be opened since the
1247                  * cdev was deleted, however active clients can still issue
1248                  * commands and close their open files.
1249                  */
1250                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1251                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1252                 wait_clients = 0;
1253         }
1254
1255         if (atomic_dec_and_test(&uverbs_dev->refcount))
1256                 ib_uverbs_comp_dev(uverbs_dev);
1257         if (wait_clients)
1258                 wait_for_completion(&uverbs_dev->comp);
1259         kobject_put(&uverbs_dev->kobj);
1260 }
1261
1262 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1263 {
1264         if (mode)
1265                 *mode = 0666;
1266         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1267 }
1268
1269 static int __init ib_uverbs_init(void)
1270 {
1271         int ret;
1272
1273         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1274                                      "infiniband_verbs");
1275         if (ret) {
1276                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1277                 goto out;
1278         }
1279
1280         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1281         if (IS_ERR(uverbs_class)) {
1282                 ret = PTR_ERR(uverbs_class);
1283                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1284                 goto out_chrdev;
1285         }
1286
1287         uverbs_class->devnode = uverbs_devnode;
1288
1289         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1290         if (ret) {
1291                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1292                 goto out_class;
1293         }
1294
1295         ret = ib_register_client(&uverbs_client);
1296         if (ret) {
1297                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1298                 goto out_class;
1299         }
1300
1301         return 0;
1302
1303 out_class:
1304         class_destroy(uverbs_class);
1305
1306 out_chrdev:
1307         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1308
1309 out:
1310         return ret;
1311 }
1312
1313 static void __exit ib_uverbs_cleanup(void)
1314 {
1315         ib_unregister_client(&uverbs_client);
1316         class_destroy(uverbs_class);
1317         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1318         if (overflow_maj)
1319                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1320         idr_destroy(&ib_uverbs_pd_idr);
1321         idr_destroy(&ib_uverbs_mr_idr);
1322         idr_destroy(&ib_uverbs_mw_idr);
1323         idr_destroy(&ib_uverbs_ah_idr);
1324         idr_destroy(&ib_uverbs_cq_idr);
1325         idr_destroy(&ib_uverbs_qp_idr);
1326         idr_destroy(&ib_uverbs_srq_idr);
1327 }
1328
1329 module_init(ib_uverbs_init);
1330 module_exit(ib_uverbs_cleanup);