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 DEFINE_IDR(ib_uverbs_wq_idr);
  80 DEFINE_IDR(ib_uverbs_rwq_ind_tbl_idr);
  81
  82 static DEFINE_SPINLOCK(map_lock);
  83 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  84
  85 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  86                                      struct ib_device *ib_dev,
  87                                      const char __user *buf, int in_len,
  88                                      int out_len) = {
  89         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  90         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  91         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  92         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  93         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  94         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  95         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  96         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  97         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  98         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  99         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
 100         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
 101         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
 102         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
 103         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 104         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
 105         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 106         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 107         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 108         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 109         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 110         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 111         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 112         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 113         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 114         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 115         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 116         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 117         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 118         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 119         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 120         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 121         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 122         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 123         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 124 };
 125
 126 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 127                                     struct ib_device *ib_dev,
 128                                     struct ib_udata *ucore,
 129                                     struct ib_udata *uhw) = {
 130         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 131         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 132         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 133         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 134         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 135         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
 136         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
 137         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
 138         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
 139         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
 140 };
 141
 142 static void ib_uverbs_add_one(struct ib_device *device);
 143 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 144
 145 int uverbs_dealloc_mw(struct ib_mw *mw)
 146 {
 147         struct ib_pd *pd = mw->pd;
 148         int ret;
 149
 150         ret = mw->device->dealloc_mw(mw);
 151         if (!ret)
 152                 atomic_dec(&pd->usecnt);
 153         return ret;
 154 }
 155
 156 static void ib_uverbs_release_dev(struct kobject *kobj)
 157 {
 158         struct ib_uverbs_device *dev =
 159                 container_of(kobj, struct ib_uverbs_device, kobj);
 160
 161         cleanup_srcu_struct(&dev->disassociate_srcu);
 162         kfree(dev);
 163 }
 164
 165 static struct kobj_type ib_uverbs_dev_ktype = {
 166         .release = ib_uverbs_release_dev,
 167 };
 168
 169 static void ib_uverbs_release_event_file(struct kref *ref)
 170 {
 171         struct ib_uverbs_event_file *file =
 172                 container_of(ref, struct ib_uverbs_event_file, ref);
 173
 174         kfree(file);
 175 }
 176
 177 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 178                           struct ib_uverbs_event_file *ev_file,
 179                           struct ib_ucq_object *uobj)
 180 {
 181         struct ib_uverbs_event *evt, *tmp;
 182
 183         if (ev_file) {
 184                 spin_lock_irq(&ev_file->lock);
 185                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 186                         list_del(&evt->list);
 187                         kfree(evt);
 188                 }
 189                 spin_unlock_irq(&ev_file->lock);
 190
 191                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 192         }
 193
 194         spin_lock_irq(&file->async_file->lock);
 195         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 196                 list_del(&evt->list);
 197                 kfree(evt);
 198         }
 199         spin_unlock_irq(&file->async_file->lock);
 200 }
 201
 202 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 203                               struct ib_uevent_object *uobj)
 204 {
 205         struct ib_uverbs_event *evt, *tmp;
 206
 207         spin_lock_irq(&file->async_file->lock);
 208         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 209                 list_del(&evt->list);
 210                 kfree(evt);
 211         }
 212         spin_unlock_irq(&file->async_file->lock);
 213 }
 214
 215 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 216                                     struct ib_uqp_object *uobj)
 217 {
 218         struct ib_uverbs_mcast_entry *mcast, *tmp;
 219
 220         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 221                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 222                 list_del(&mcast->list);
 223                 kfree(mcast);
 224         }
 225 }
 226
 227 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 228                                       struct ib_ucontext *context)
 229 {
 230         struct ib_uobject *uobj, *tmp;
 231
 232         context->closing = 1;
 233
 234         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 235                 struct ib_ah *ah = uobj->object;
 236
 237                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 238                 ib_destroy_ah(ah);
 239                 kfree(uobj);
 240         }
 241
 242         /* Remove MWs before QPs, in order to support type 2A MWs. */
 243         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 244                 struct ib_mw *mw = uobj->object;
 245
 246                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 247                 uverbs_dealloc_mw(mw);
 248                 kfree(uobj);
 249         }
 250
 251         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 252                 struct ib_flow *flow_id = uobj->object;
 253
 254                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 255                 ib_destroy_flow(flow_id);
 256                 kfree(uobj);
 257         }
 258
 259         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 260                 struct ib_qp *qp = uobj->object;
 261                 struct ib_uqp_object *uqp =
 262                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 263
 264                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 265                 if (qp != qp->real_qp) {
 266                         ib_close_qp(qp);
 267                 } else {
 268                         ib_uverbs_detach_umcast(qp, uqp);
 269                         ib_destroy_qp(qp);
 270                 }
 271                 ib_uverbs_release_uevent(file, &uqp->uevent);
 272                 kfree(uqp);
 273         }
 274
 275         list_for_each_entry_safe(uobj, tmp, &context->rwq_ind_tbl_list, list) {
 276                 struct ib_rwq_ind_table *rwq_ind_tbl = uobj->object;
 277                 struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl;
 278
 279                 idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
 280                 ib_destroy_rwq_ind_table(rwq_ind_tbl);
 281                 kfree(ind_tbl);
 282                 kfree(uobj);
 283         }
 284
 285         list_for_each_entry_safe(uobj, tmp, &context->wq_list, list) {
 286                 struct ib_wq *wq = uobj->object;
 287                 struct ib_uwq_object *uwq =
 288                         container_of(uobj, struct ib_uwq_object, uevent.uobject);
 289
 290                 idr_remove_uobj(&ib_uverbs_wq_idr, uobj);
 291                 ib_destroy_wq(wq);
 292                 ib_uverbs_release_uevent(file, &uwq->uevent);
 293                 kfree(uwq);
 294         }
 295
 296         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 297                 struct ib_srq *srq = uobj->object;
 298                 struct ib_uevent_object *uevent =
 299                         container_of(uobj, struct ib_uevent_object, uobject);
 300
 301                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 302                 ib_destroy_srq(srq);
 303                 ib_uverbs_release_uevent(file, uevent);
 304                 kfree(uevent);
 305         }
 306
 307         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 308                 struct ib_cq *cq = uobj->object;
 309                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 310                 struct ib_ucq_object *ucq =
 311                         container_of(uobj, struct ib_ucq_object, uobject);
 312
 313                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 314                 ib_destroy_cq(cq);
 315                 ib_uverbs_release_ucq(file, ev_file, ucq);
 316                 kfree(ucq);
 317         }
 318
 319         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 320                 struct ib_mr *mr = uobj->object;
 321
 322                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 323                 ib_dereg_mr(mr);
 324                 kfree(uobj);
 325         }
 326
 327         mutex_lock(&file->device->xrcd_tree_mutex);
 328         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 329                 struct ib_xrcd *xrcd = uobj->object;
 330                 struct ib_uxrcd_object *uxrcd =
 331                         container_of(uobj, struct ib_uxrcd_object, uobject);
 332
 333                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 334                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 335                 kfree(uxrcd);
 336         }
 337         mutex_unlock(&file->device->xrcd_tree_mutex);
 338
 339         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 340                 struct ib_pd *pd = uobj->object;
 341
 342                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 343                 ib_dealloc_pd(pd);
 344                 kfree(uobj);
 345         }
 346
 347         put_pid(context->tgid);
 348
 349         return context->device->dealloc_ucontext(context);
 350 }
 351
 352 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 353 {
 354         complete(&dev->comp);
 355 }
 356
 357 static void ib_uverbs_release_file(struct kref *ref)
 358 {
 359         struct ib_uverbs_file *file =
 360                 container_of(ref, struct ib_uverbs_file, ref);
 361         struct ib_device *ib_dev;
 362         int srcu_key;
 363
 364         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 365         ib_dev = srcu_dereference(file->device->ib_dev,
 366                                   &file->device->disassociate_srcu);
 367         if (ib_dev && !ib_dev->disassociate_ucontext)
 368                 module_put(ib_dev->owner);
 369         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 370
 371         if (atomic_dec_and_test(&file->device->refcount))
 372                 ib_uverbs_comp_dev(file->device);
 373
 374         kfree(file);
 375 }
 376
 377 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 378                                     size_t count, loff_t *pos)
 379 {
 380         struct ib_uverbs_event_file *file = filp->private_data;
 381         struct ib_uverbs_event *event;
 382         int eventsz;
 383         int ret = 0;
 384
 385         spin_lock_irq(&file->lock);
 386
 387         while (list_empty(&file->event_list)) {
 388                 spin_unlock_irq(&file->lock);
 389
 390                 if (filp->f_flags & O_NONBLOCK)
 391                         return -EAGAIN;
 392
 393                 if (wait_event_interruptible(file->poll_wait,
 394                                              (!list_empty(&file->event_list) ||
 395                         /* The barriers built into wait_event_interruptible()
 396                          * and wake_up() guarentee this will see the null set
 397                          * without using RCU
 398                          */
 399                                              !file->uverbs_file->device->ib_dev)))
 400                         return -ERESTARTSYS;
 401
 402                 /* If device was disassociated and no event exists set an error */
 403                 if (list_empty(&file->event_list) &&
 404                     !file->uverbs_file->device->ib_dev)
 405                         return -EIO;
 406
 407                 spin_lock_irq(&file->lock);
 408         }
 409
 410         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 411
 412         if (file->is_async)
 413                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 414         else
 415                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 416
 417         if (eventsz > count) {
 418                 ret   = -EINVAL;
 419                 event = NULL;
 420         } else {
 421                 list_del(file->event_list.next);
 422                 if (event->counter) {
 423                         ++(*event->counter);
 424                         list_del(&event->obj_list);
 425                 }
 426         }
 427
 428         spin_unlock_irq(&file->lock);
 429
 430         if (event) {
 431                 if (copy_to_user(buf, event, eventsz))
 432                         ret = -EFAULT;
 433                 else
 434                         ret = eventsz;
 435         }
 436
 437         kfree(event);
 438
 439         return ret;
 440 }
 441
 442 static unsigned int ib_uverbs_event_poll(struct file *filp,
 443                                          struct poll_table_struct *wait)
 444 {
 445         unsigned int pollflags = 0;
 446         struct ib_uverbs_event_file *file = filp->private_data;
 447
 448         poll_wait(filp, &file->poll_wait, wait);
 449
 450         spin_lock_irq(&file->lock);
 451         if (!list_empty(&file->event_list))
 452                 pollflags = POLLIN | POLLRDNORM;
 453         spin_unlock_irq(&file->lock);
 454
 455         return pollflags;
 456 }
 457
 458 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 459 {
 460         struct ib_uverbs_event_file *file = filp->private_data;
 461
 462         return fasync_helper(fd, filp, on, &file->async_queue);
 463 }
 464
 465 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 466 {
 467         struct ib_uverbs_event_file *file = filp->private_data;
 468         struct ib_uverbs_event *entry, *tmp;
 469         int closed_already = 0;
 470
 471         mutex_lock(&file->uverbs_file->device->lists_mutex);
 472         spin_lock_irq(&file->lock);
 473         closed_already = file->is_closed;
 474         file->is_closed = 1;
 475         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 476                 if (entry->counter)
 477                         list_del(&entry->obj_list);
 478                 kfree(entry);
 479         }
 480         spin_unlock_irq(&file->lock);
 481         if (!closed_already) {
 482                 list_del(&file->list);
 483                 if (file->is_async)
 484                         ib_unregister_event_handler(&file->uverbs_file->
 485                                 event_handler);
 486         }
 487         mutex_unlock(&file->uverbs_file->device->lists_mutex);
 488
 489         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 490         kref_put(&file->ref, ib_uverbs_release_event_file);
 491
 492         return 0;
 493 }
 494
 495 static const struct file_operations uverbs_event_fops = {
 496         .owner   = THIS_MODULE,
 497         .read    = ib_uverbs_event_read,
 498         .poll    = ib_uverbs_event_poll,
 499         .release = ib_uverbs_event_close,
 500         .fasync  = ib_uverbs_event_fasync,
 501         .llseek  = no_llseek,
 502 };
 503
 504 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 505 {
 506         struct ib_uverbs_event_file    *file = cq_context;
 507         struct ib_ucq_object           *uobj;
 508         struct ib_uverbs_event         *entry;
 509         unsigned long                   flags;
 510
 511         if (!file)
 512                 return;
 513
 514         spin_lock_irqsave(&file->lock, flags);
 515         if (file->is_closed) {
 516                 spin_unlock_irqrestore(&file->lock, flags);
 517                 return;
 518         }
 519
 520         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 521         if (!entry) {
 522                 spin_unlock_irqrestore(&file->lock, flags);
 523                 return;
 524         }
 525
 526         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 527
 528         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 529         entry->counter             = &uobj->comp_events_reported;
 530
 531         list_add_tail(&entry->list, &file->event_list);
 532         list_add_tail(&entry->obj_list, &uobj->comp_list);
 533         spin_unlock_irqrestore(&file->lock, flags);
 534
 535         wake_up_interruptible(&file->poll_wait);
 536         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 537 }
 538
 539 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 540                                     __u64 element, __u64 event,
 541                                     struct list_head *obj_list,
 542                                     u32 *counter)
 543 {
 544         struct ib_uverbs_event *entry;
 545         unsigned long flags;
 546
 547         spin_lock_irqsave(&file->async_file->lock, flags);
 548         if (file->async_file->is_closed) {
 549                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 550                 return;
 551         }
 552
 553         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 554         if (!entry) {
 555                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 556                 return;
 557         }
 558
 559         entry->desc.async.element    = element;
 560         entry->desc.async.event_type = event;
 561         entry->desc.async.reserved   = 0;
 562         entry->counter               = counter;
 563
 564         list_add_tail(&entry->list, &file->async_file->event_list);
 565         if (obj_list)
 566                 list_add_tail(&entry->obj_list, obj_list);
 567         spin_unlock_irqrestore(&file->async_file->lock, flags);
 568
 569         wake_up_interruptible(&file->async_file->poll_wait);
 570         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 571 }
 572
 573 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 574 {
 575         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 576                                                   struct ib_ucq_object, uobject);
 577
 578         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 579                                 event->event, &uobj->async_list,
 580                                 &uobj->async_events_reported);
 581 }
 582
 583 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 584 {
 585         struct ib_uevent_object *uobj;
 586
 587         /* for XRC target qp's, check that qp is live */
 588         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
 589                 return;
 590
 591         uobj = container_of(event->element.qp->uobject,
 592                             struct ib_uevent_object, uobject);
 593
 594         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 595                                 event->event, &uobj->event_list,
 596                                 &uobj->events_reported);
 597 }
 598
 599 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 600 {
 601         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
 602                                                   struct ib_uevent_object, uobject);
 603
 604         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 605                                 event->event, &uobj->event_list,
 606                                 &uobj->events_reported);
 607 }
 608
 609 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 610 {
 611         struct ib_uevent_object *uobj;
 612
 613         uobj = container_of(event->element.srq->uobject,
 614                             struct ib_uevent_object, uobject);
 615
 616         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 617                                 event->event, &uobj->event_list,
 618                                 &uobj->events_reported);
 619 }
 620
 621 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 622                              struct ib_event *event)
 623 {
 624         struct ib_uverbs_file *file =
 625                 container_of(handler, struct ib_uverbs_file, event_handler);
 626
 627         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 628                                 NULL, NULL);
 629 }
 630
 631 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 632 {
 633         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 634         file->async_file = NULL;
 635 }
 636
 637 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 638                                         struct ib_device        *ib_dev,
 639                                         int is_async)
 640 {
 641         struct ib_uverbs_event_file *ev_file;
 642         struct file *filp;
 643         int ret;
 644
 645         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 646         if (!ev_file)
 647                 return ERR_PTR(-ENOMEM);
 648
 649         kref_init(&ev_file->ref);
 650         spin_lock_init(&ev_file->lock);
 651         INIT_LIST_HEAD(&ev_file->event_list);
 652         init_waitqueue_head(&ev_file->poll_wait);
 653         ev_file->uverbs_file = uverbs_file;
 654         kref_get(&ev_file->uverbs_file->ref);
 655         ev_file->async_queue = NULL;
 656         ev_file->is_closed   = 0;
 657
 658         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 659                                   ev_file, O_RDONLY);
 660         if (IS_ERR(filp))
 661                 goto err_put_refs;
 662
 663         mutex_lock(&uverbs_file->device->lists_mutex);
 664         list_add_tail(&ev_file->list,
 665                       &uverbs_file->device->uverbs_events_file_list);
 666         mutex_unlock(&uverbs_file->device->lists_mutex);
 667
 668         if (is_async) {
 669                 WARN_ON(uverbs_file->async_file);
 670                 uverbs_file->async_file = ev_file;
 671                 kref_get(&uverbs_file->async_file->ref);
 672                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 673                                       ib_dev,
 674                                       ib_uverbs_event_handler);
 675                 ret = ib_register_event_handler(&uverbs_file->event_handler);
 676                 if (ret)
 677                         goto err_put_file;
 678
 679                 /* At that point async file stuff was fully set */
 680                 ev_file->is_async = 1;
 681         }
 682
 683         return filp;
 684
 685 err_put_file:
 686         fput(filp);
 687         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
 688         uverbs_file->async_file = NULL;
 689         return ERR_PTR(ret);
 690
 691 err_put_refs:
 692         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 693         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 694         return filp;
 695 }
 696
 697 /*
 698  * Look up a completion event file by FD.  If lookup is successful,
 699  * takes a ref to the event file struct that it returns; if
 700  * unsuccessful, returns NULL.
 701  */
 702 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 703 {
 704         struct ib_uverbs_event_file *ev_file = NULL;
 705         struct fd f = fdget(fd);
 706
 707         if (!f.file)
 708                 return NULL;
 709
 710         if (f.file->f_op != &uverbs_event_fops)
 711                 goto out;
 712
 713         ev_file = f.file->private_data;
 714         if (ev_file->is_async) {
 715                 ev_file = NULL;
 716                 goto out;
 717         }
 718
 719         kref_get(&ev_file->ref);
 720
 721 out:
 722         fdput(f);
 723         return ev_file;
 724 }
 725
 726 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
 727 {
 728         u64 mask;
 729
 730         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
 731                 mask = ib_dev->uverbs_cmd_mask;
 732         else
 733                 mask = ib_dev->uverbs_ex_cmd_mask;
 734
 735         if (mask & ((u64)1 << command))
 736                 return 0;
 737
 738         return -1;
 739 }
 740
 741 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 742                              size_t count, loff_t *pos)
 743 {
 744         struct ib_uverbs_file *file = filp->private_data;
 745         struct ib_device *ib_dev;
 746         struct ib_uverbs_cmd_hdr hdr;
 747         __u32 command;
 748         __u32 flags;
 749         int srcu_key;
 750         ssize_t ret;
 751
 752         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
 753                 return -EACCES;
 754
 755         if (count < sizeof hdr)
 756                 return -EINVAL;
 757
 758         if (copy_from_user(&hdr, buf, sizeof hdr))
 759                 return -EFAULT;
 760
 761         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 762         ib_dev = srcu_dereference(file->device->ib_dev,
 763                                   &file->device->disassociate_srcu);
 764         if (!ib_dev) {
 765                 ret = -EIO;
 766                 goto out;
 767         }
 768
 769         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 770                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
 771                 ret = -EINVAL;
 772                 goto out;
 773         }
 774
 775         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 776         if (verify_command_mask(ib_dev, command)) {
 777                 ret = -EOPNOTSUPP;
 778                 goto out;
 779         }
 780
 781         if (!file->ucontext &&
 782             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 783                 ret = -EINVAL;
 784                 goto out;
 785         }
 786
 787         flags = (hdr.command &
 788                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 789
 790         if (!flags) {
 791                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 792                     !uverbs_cmd_table[command]) {
 793                         ret = -EINVAL;
 794                         goto out;
 795                 }
 796
 797                 if (hdr.in_words * 4 != count) {
 798                         ret = -EINVAL;
 799                         goto out;
 800                 }
 801
 802                 ret = uverbs_cmd_table[command](file, ib_dev,
 803                                                  buf + sizeof(hdr),
 804                                                  hdr.in_words * 4,
 805                                                  hdr.out_words * 4);
 806
 807         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 808                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 809                 struct ib_udata ucore;
 810                 struct ib_udata uhw;
 811                 size_t written_count = count;
 812
 813                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 814                     !uverbs_ex_cmd_table[command]) {
 815                         ret = -ENOSYS;
 816                         goto out;
 817                 }
 818
 819                 if (!file->ucontext) {
 820                         ret = -EINVAL;
 821                         goto out;
 822                 }
 823
 824                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 825                         ret = -EINVAL;
 826                         goto out;
 827                 }
 828
 829                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 830                         ret = -EFAULT;
 831                         goto out;
 832                 }
 833
 834                 count -= sizeof(hdr) + sizeof(ex_hdr);
 835                 buf += sizeof(hdr) + sizeof(ex_hdr);
 836
 837                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 838                         ret = -EINVAL;
 839                         goto out;
 840                 }
 841
 842                 if (ex_hdr.cmd_hdr_reserved) {
 843                         ret = -EINVAL;
 844                         goto out;
 845                 }
 846
 847                 if (ex_hdr.response) {
 848                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 849                                 ret = -EINVAL;
 850                                 goto out;
 851                         }
 852
 853                         if (!access_ok(VERIFY_WRITE,
 854                                        (void __user *) (unsigned long) ex_hdr.response,
 855                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 856                                 ret = -EFAULT;
 857                                 goto out;
 858                         }
 859                 } else {
 860                         if (hdr.out_words || ex_hdr.provider_out_words) {
 861                                 ret = -EINVAL;
 862                                 goto out;
 863                         }
 864                 }
 865
 866                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 867                                        hdr.in_words * 8, hdr.out_words * 8);
 868
 869                 INIT_UDATA_BUF_OR_NULL(&uhw,
 870                                        buf + ucore.inlen,
 871                                        (unsigned long) ex_hdr.response + ucore.outlen,
 872                                        ex_hdr.provider_in_words * 8,
 873                                        ex_hdr.provider_out_words * 8);
 874
 875                 ret = uverbs_ex_cmd_table[command](file,
 876                                                    ib_dev,
 877                                                    &ucore,
 878                                                    &uhw);
 879                 if (!ret)
 880                         ret = written_count;
 881         } else {
 882                 ret = -ENOSYS;
 883         }
 884
 885 out:
 886         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 887         return ret;
 888 }
 889
 890 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 891 {
 892         struct ib_uverbs_file *file = filp->private_data;
 893         struct ib_device *ib_dev;
 894         int ret = 0;
 895         int srcu_key;
 896
 897         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 898         ib_dev = srcu_dereference(file->device->ib_dev,
 899                                   &file->device->disassociate_srcu);
 900         if (!ib_dev) {
 901                 ret = -EIO;
 902                 goto out;
 903         }
 904
 905         if (!file->ucontext)
 906                 ret = -ENODEV;
 907         else
 908                 ret = ib_dev->mmap(file->ucontext, vma);
 909 out:
 910         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 911         return ret;
 912 }
 913
 914 /*
 915  * ib_uverbs_open() does not need the BKL:
 916  *
 917  *  - the ib_uverbs_device structures are properly reference counted and
 918  *    everything else is purely local to the file being created, so
 919  *    races against other open calls are not a problem;
 920  *  - there is no ioctl method to race against;
 921  *  - the open method will either immediately run -ENXIO, or all
 922  *    required initialization will be done.
 923  */
 924 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 925 {
 926         struct ib_uverbs_device *dev;
 927         struct ib_uverbs_file *file;
 928         struct ib_device *ib_dev;
 929         int ret;
 930         int module_dependent;
 931         int srcu_key;
 932
 933         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 934         if (!atomic_inc_not_zero(&dev->refcount))
 935                 return -ENXIO;
 936
 937         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 938         mutex_lock(&dev->lists_mutex);
 939         ib_dev = srcu_dereference(dev->ib_dev,
 940                                   &dev->disassociate_srcu);
 941         if (!ib_dev) {
 942                 ret = -EIO;
 943                 goto err;
 944         }
 945
 946         /* In case IB device supports disassociate ucontext, there is no hard
 947          * dependency between uverbs device and its low level device.
 948          */
 949         module_dependent = !(ib_dev->disassociate_ucontext);
 950
 951         if (module_dependent) {
 952                 if (!try_module_get(ib_dev->owner)) {
 953                         ret = -ENODEV;
 954                         goto err;
 955                 }
 956         }
 957
 958         file = kzalloc(sizeof(*file), GFP_KERNEL);
 959         if (!file) {
 960                 ret = -ENOMEM;
 961                 if (module_dependent)
 962                         goto err_module;
 963
 964                 goto err;
 965         }
 966
 967         file->device     = dev;
 968         file->ucontext   = NULL;
 969         file->async_file = NULL;
 970         kref_init(&file->ref);
 971         mutex_init(&file->mutex);
 972         mutex_init(&file->cleanup_mutex);
 973
 974         filp->private_data = file;
 975         kobject_get(&dev->kobj);
 976         list_add_tail(&file->list, &dev->uverbs_file_list);
 977         mutex_unlock(&dev->lists_mutex);
 978         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 979
 980         return nonseekable_open(inode, filp);
 981
 982 err_module:
 983         module_put(ib_dev->owner);
 984
 985 err:
 986         mutex_unlock(&dev->lists_mutex);
 987         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 988         if (atomic_dec_and_test(&dev->refcount))
 989                 ib_uverbs_comp_dev(dev);
 990
 991         return ret;
 992 }
 993
 994 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 995 {
 996         struct ib_uverbs_file *file = filp->private_data;
 997         struct ib_uverbs_device *dev = file->device;
 998
 999         mutex_lock(&file->cleanup_mutex);
1000         if (file->ucontext) {
1001                 ib_uverbs_cleanup_ucontext(file, file->ucontext);
1002                 file->ucontext = NULL;
1003         }
1004         mutex_unlock(&file->cleanup_mutex);
1005
1006         mutex_lock(&file->device->lists_mutex);
1007         if (!file->is_closed) {
1008                 list_del(&file->list);
1009                 file->is_closed = 1;
1010         }
1011         mutex_unlock(&file->device->lists_mutex);
1012
1013         if (file->async_file)
1014                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
1015
1016         kref_put(&file->ref, ib_uverbs_release_file);
1017         kobject_put(&dev->kobj);
1018
1019         return 0;
1020 }
1021
1022 static const struct file_operations uverbs_fops = {
1023         .owner   = THIS_MODULE,
1024         .write   = ib_uverbs_write,
1025         .open    = ib_uverbs_open,
1026         .release = ib_uverbs_close,
1027         .llseek  = no_llseek,
1028 };
1029
1030 static const struct file_operations uverbs_mmap_fops = {
1031         .owner   = THIS_MODULE,
1032         .write   = ib_uverbs_write,
1033         .mmap    = ib_uverbs_mmap,
1034         .open    = ib_uverbs_open,
1035         .release = ib_uverbs_close,
1036         .llseek  = no_llseek,
1037 };
1038
1039 static struct ib_client uverbs_client = {
1040         .name   = "uverbs",
1041         .add    = ib_uverbs_add_one,
1042         .remove = ib_uverbs_remove_one
1043 };
1044
1045 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1046                           char *buf)
1047 {
1048         int ret = -ENODEV;
1049         int srcu_key;
1050         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1051         struct ib_device *ib_dev;
1052
1053         if (!dev)
1054                 return -ENODEV;
1055
1056         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1057         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1058         if (ib_dev)
1059                 ret = sprintf(buf, "%s\n", ib_dev->name);
1060         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1061
1062         return ret;
1063 }
1064 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1065
1066 static ssize_t show_dev_abi_version(struct device *device,
1067                                     struct device_attribute *attr, char *buf)
1068 {
1069         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1070         int ret = -ENODEV;
1071         int srcu_key;
1072         struct ib_device *ib_dev;
1073
1074         if (!dev)
1075                 return -ENODEV;
1076         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1077         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1078         if (ib_dev)
1079                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1080         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1081
1082         return ret;
1083 }
1084 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1085
1086 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1087                          __stringify(IB_USER_VERBS_ABI_VERSION));
1088
1089 static dev_t overflow_maj;
1090 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1091
1092 /*
1093  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1094  * requesting a new major number and doubling the number of max devices we
1095  * support. It's stupid, but simple.
1096  */
1097 static int find_overflow_devnum(void)
1098 {
1099         int ret;
1100
1101         if (!overflow_maj) {
1102                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1103                                           "infiniband_verbs");
1104                 if (ret) {
1105                         pr_err("user_verbs: couldn't register dynamic device number\n");
1106                         return ret;
1107                 }
1108         }
1109
1110         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1111         if (ret >= IB_UVERBS_MAX_DEVICES)
1112                 return -1;
1113
1114         return ret;
1115 }
1116
1117 static void ib_uverbs_add_one(struct ib_device *device)
1118 {
1119         int devnum;
1120         dev_t base;
1121         struct ib_uverbs_device *uverbs_dev;
1122         int ret;
1123
1124         if (!device->alloc_ucontext)
1125                 return;
1126
1127         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1128         if (!uverbs_dev)
1129                 return;
1130
1131         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1132         if (ret) {
1133                 kfree(uverbs_dev);
1134                 return;
1135         }
1136
1137         atomic_set(&uverbs_dev->refcount, 1);
1138         init_completion(&uverbs_dev->comp);
1139         uverbs_dev->xrcd_tree = RB_ROOT;
1140         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1141         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1142         mutex_init(&uverbs_dev->lists_mutex);
1143         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1144         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1145
1146         spin_lock(&map_lock);
1147         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1148         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1149                 spin_unlock(&map_lock);
1150                 devnum = find_overflow_devnum();
1151                 if (devnum < 0)
1152                         goto err;
1153
1154                 spin_lock(&map_lock);
1155                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1156                 base = devnum + overflow_maj;
1157                 set_bit(devnum, overflow_map);
1158         } else {
1159                 uverbs_dev->devnum = devnum;
1160                 base = devnum + IB_UVERBS_BASE_DEV;
1161                 set_bit(devnum, dev_map);
1162         }
1163         spin_unlock(&map_lock);
1164
1165         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1166         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1167
1168         cdev_init(&uverbs_dev->cdev, NULL);
1169         uverbs_dev->cdev.owner = THIS_MODULE;
1170         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1171         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1172         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1173         if (cdev_add(&uverbs_dev->cdev, base, 1))
1174                 goto err_cdev;
1175
1176         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1177                                         uverbs_dev->cdev.dev, uverbs_dev,
1178                                         "uverbs%d", uverbs_dev->devnum);
1179         if (IS_ERR(uverbs_dev->dev))
1180                 goto err_cdev;
1181
1182         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1183                 goto err_class;
1184         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1185                 goto err_class;
1186
1187         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1188
1189         return;
1190
1191 err_class:
1192         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1193
1194 err_cdev:
1195         cdev_del(&uverbs_dev->cdev);
1196         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1197                 clear_bit(devnum, dev_map);
1198         else
1199                 clear_bit(devnum, overflow_map);
1200
1201 err:
1202         if (atomic_dec_and_test(&uverbs_dev->refcount))
1203                 ib_uverbs_comp_dev(uverbs_dev);
1204         wait_for_completion(&uverbs_dev->comp);
1205         kobject_put(&uverbs_dev->kobj);
1206         return;
1207 }
1208
1209 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1210                                         struct ib_device *ib_dev)
1211 {
1212         struct ib_uverbs_file *file;
1213         struct ib_uverbs_event_file *event_file;
1214         struct ib_event event;
1215
1216         /* Pending running commands to terminate */
1217         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1218         event.event = IB_EVENT_DEVICE_FATAL;
1219         event.element.port_num = 0;
1220         event.device = ib_dev;
1221
1222         mutex_lock(&uverbs_dev->lists_mutex);
1223         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1224                 struct ib_ucontext *ucontext;
1225                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1226                                         struct ib_uverbs_file, list);
1227                 file->is_closed = 1;
1228                 list_del(&file->list);
1229                 kref_get(&file->ref);
1230                 mutex_unlock(&uverbs_dev->lists_mutex);
1231
1232                 ib_uverbs_event_handler(&file->event_handler, &event);
1233
1234                 mutex_lock(&file->cleanup_mutex);
1235                 ucontext = file->ucontext;
1236                 file->ucontext = NULL;
1237                 mutex_unlock(&file->cleanup_mutex);
1238
1239                 /* At this point ib_uverbs_close cannot be running
1240                  * ib_uverbs_cleanup_ucontext
1241                  */
1242                 if (ucontext) {
1243                         /* We must release the mutex before going ahead and
1244                          * calling disassociate_ucontext. disassociate_ucontext
1245                          * might end up indirectly calling uverbs_close,
1246                          * for example due to freeing the resources
1247                          * (e.g mmput).
1248                          */
1249                         ib_dev->disassociate_ucontext(ucontext);
1250                         ib_uverbs_cleanup_ucontext(file, ucontext);
1251                 }
1252
1253                 mutex_lock(&uverbs_dev->lists_mutex);
1254                 kref_put(&file->ref, ib_uverbs_release_file);
1255         }
1256
1257         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1258                 event_file = list_first_entry(&uverbs_dev->
1259                                               uverbs_events_file_list,
1260                                               struct ib_uverbs_event_file,
1261                                               list);
1262                 spin_lock_irq(&event_file->lock);
1263                 event_file->is_closed = 1;
1264                 spin_unlock_irq(&event_file->lock);
1265
1266                 list_del(&event_file->list);
1267                 if (event_file->is_async) {
1268                         ib_unregister_event_handler(&event_file->uverbs_file->
1269                                                     event_handler);
1270                         event_file->uverbs_file->event_handler.device = NULL;
1271                 }
1272
1273                 wake_up_interruptible(&event_file->poll_wait);
1274                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1275         }
1276         mutex_unlock(&uverbs_dev->lists_mutex);
1277 }
1278
1279 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1280 {
1281         struct ib_uverbs_device *uverbs_dev = client_data;
1282         int wait_clients = 1;
1283
1284         if (!uverbs_dev)
1285                 return;
1286
1287         dev_set_drvdata(uverbs_dev->dev, NULL);
1288         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1289         cdev_del(&uverbs_dev->cdev);
1290
1291         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1292                 clear_bit(uverbs_dev->devnum, dev_map);
1293         else
1294                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1295
1296         if (device->disassociate_ucontext) {
1297                 /* We disassociate HW resources and immediately return.
1298                  * Userspace will see a EIO errno for all future access.
1299                  * Upon returning, ib_device may be freed internally and is not
1300                  * valid any more.
1301                  * uverbs_device is still available until all clients close
1302                  * their files, then the uverbs device ref count will be zero
1303                  * and its resources will be freed.
1304                  * Note: At this point no more files can be opened since the
1305                  * cdev was deleted, however active clients can still issue
1306                  * commands and close their open files.
1307                  */
1308                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1309                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1310                 wait_clients = 0;
1311         }
1312
1313         if (atomic_dec_and_test(&uverbs_dev->refcount))
1314                 ib_uverbs_comp_dev(uverbs_dev);
1315         if (wait_clients)
1316                 wait_for_completion(&uverbs_dev->comp);
1317         kobject_put(&uverbs_dev->kobj);
1318 }
1319
1320 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1321 {
1322         if (mode)
1323                 *mode = 0666;
1324         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1325 }
1326
1327 static int __init ib_uverbs_init(void)
1328 {
1329         int ret;
1330
1331         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1332                                      "infiniband_verbs");
1333         if (ret) {
1334                 pr_err("user_verbs: couldn't register device number\n");
1335                 goto out;
1336         }
1337
1338         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1339         if (IS_ERR(uverbs_class)) {
1340                 ret = PTR_ERR(uverbs_class);
1341                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1342                 goto out_chrdev;
1343         }
1344
1345         uverbs_class->devnode = uverbs_devnode;
1346
1347         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1348         if (ret) {
1349                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1350                 goto out_class;
1351         }
1352
1353         ret = ib_register_client(&uverbs_client);
1354         if (ret) {
1355                 pr_err("user_verbs: couldn't register client\n");
1356                 goto out_class;
1357         }
1358
1359         return 0;
1360
1361 out_class:
1362         class_destroy(uverbs_class);
1363
1364 out_chrdev:
1365         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1366
1367 out:
1368         return ret;
1369 }
1370
1371 static void __exit ib_uverbs_cleanup(void)
1372 {
1373         ib_unregister_client(&uverbs_client);
1374         class_destroy(uverbs_class);
1375         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1376         if (overflow_maj)
1377                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1378         idr_destroy(&ib_uverbs_pd_idr);
1379         idr_destroy(&ib_uverbs_mr_idr);
1380         idr_destroy(&ib_uverbs_mw_idr);
1381         idr_destroy(&ib_uverbs_ah_idr);
1382         idr_destroy(&ib_uverbs_cq_idr);
1383         idr_destroy(&ib_uverbs_qp_idr);
1384         idr_destroy(&ib_uverbs_srq_idr);
1385 }
1386
1387 module_init(ib_uverbs_init);
1388 module_exit(ib_uverbs_cleanup);