kernel/drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/poll.h>
  43 #include <linux/sched.h>
  44 #include <linux/file.h>
  45 #include <linux/cdev.h>
  46 #include <linux/anon_inodes.h>
  47 #include <linux/slab.h>
  48
  49 #include <asm/uaccess.h>
  50
  51 #include <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_uverbs_detach_umcast(qp, uqp);
 249                 ib_destroy_qp(qp);
 250                 ib_uverbs_release_uevent(file, &uqp->uevent);
 251                 kfree(uqp);
 252         }
 253
 254         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 255                 struct ib_srq *srq = uobj->object;
 256                 struct ib_uevent_object *uevent =
 257                         container_of(uobj, struct ib_uevent_object, uobject);
 258
 259                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 260                 ib_destroy_srq(srq);
 261                 ib_uverbs_release_uevent(file, uevent);
 262                 kfree(uevent);
 263         }
 264
 265         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 266                 struct ib_cq *cq = uobj->object;
 267                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 268                 struct ib_ucq_object *ucq =
 269                         container_of(uobj, struct ib_ucq_object, uobject);
 270
 271                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 272                 ib_destroy_cq(cq);
 273                 ib_uverbs_release_ucq(file, ev_file, ucq);
 274                 kfree(ucq);
 275         }
 276
 277         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 278                 struct ib_mr *mr = uobj->object;
 279
 280                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 281                 ib_dereg_mr(mr);
 282                 kfree(uobj);
 283         }
 284
 285         mutex_lock(&file->device->xrcd_tree_mutex);
 286         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 287                 struct ib_xrcd *xrcd = uobj->object;
 288                 struct ib_uxrcd_object *uxrcd =
 289                         container_of(uobj, struct ib_uxrcd_object, uobject);
 290
 291                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 292                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 293                 kfree(uxrcd);
 294         }
 295         mutex_unlock(&file->device->xrcd_tree_mutex);
 296
 297         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 298                 struct ib_pd *pd = uobj->object;
 299
 300                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 301                 ib_dealloc_pd(pd);
 302                 kfree(uobj);
 303         }
 304
 305         put_pid(context->tgid);
 306
 307         return context->device->dealloc_ucontext(context);
 308 }
 309
 310 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 311 {
 312         complete(&dev->comp);
 313 }
 314
 315 static void ib_uverbs_release_file(struct kref *ref)
 316 {
 317         struct ib_uverbs_file *file =
 318                 container_of(ref, struct ib_uverbs_file, ref);
 319         struct ib_device *ib_dev;
 320         int srcu_key;
 321
 322         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 323         ib_dev = srcu_dereference(file->device->ib_dev,
 324                                   &file->device->disassociate_srcu);
 325         if (ib_dev && !ib_dev->disassociate_ucontext)
 326                 module_put(ib_dev->owner);
 327         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 328
 329         if (atomic_dec_and_test(&file->device->refcount))
 330                 ib_uverbs_comp_dev(file->device);
 331
 332         kfree(file);
 333 }
 334
 335 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 336                                     size_t count, loff_t *pos)
 337 {
 338         struct ib_uverbs_event_file *file = filp->private_data;
 339         struct ib_uverbs_event *event;
 340         int eventsz;
 341         int ret = 0;
 342
 343         spin_lock_irq(&file->lock);
 344
 345         while (list_empty(&file->event_list)) {
 346                 spin_unlock_irq(&file->lock);
 347
 348                 if (filp->f_flags & O_NONBLOCK)
 349                         return -EAGAIN;
 350
 351                 if (wait_event_interruptible(file->poll_wait,
 352                                              (!list_empty(&file->event_list) ||
 353                         /* The barriers built into wait_event_interruptible()
 354                          * and wake_up() guarentee this will see the null set
 355                          * without using RCU
 356                          */
 357                                              !file->uverbs_file->device->ib_dev)))
 358                         return -ERESTARTSYS;
 359
 360                 /* If device was disassociated and no event exists set an error */
 361                 if (list_empty(&file->event_list) &&
 362                     !file->uverbs_file->device->ib_dev)
 363                         return -EIO;
 364
 365                 spin_lock_irq(&file->lock);
 366         }
 367
 368         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 369
 370         if (file->is_async)
 371                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 372         else
 373                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 374
 375         if (eventsz > count) {
 376                 ret   = -EINVAL;
 377                 event = NULL;
 378         } else {
 379                 list_del(file->event_list.next);
 380                 if (event->counter) {
 381                         ++(*event->counter);
 382                         list_del(&event->obj_list);
 383                 }
 384         }
 385
 386         spin_unlock_irq(&file->lock);
 387
 388         if (event) {
 389                 if (copy_to_user(buf, event, eventsz))
 390                         ret = -EFAULT;
 391                 else
 392                         ret = eventsz;
 393         }
 394
 395         kfree(event);
 396
 397         return ret;
 398 }
 399
 400 static unsigned int ib_uverbs_event_poll(struct file *filp,
 401                                          struct poll_table_struct *wait)
 402 {
 403         unsigned int pollflags = 0;
 404         struct ib_uverbs_event_file *file = filp->private_data;
 405
 406         poll_wait(filp, &file->poll_wait, wait);
 407
 408         spin_lock_irq(&file->lock);
 409         if (!list_empty(&file->event_list))
 410                 pollflags = POLLIN | POLLRDNORM;
 411         spin_unlock_irq(&file->lock);
 412
 413         return pollflags;
 414 }
 415
 416 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 417 {
 418         struct ib_uverbs_event_file *file = filp->private_data;
 419
 420         return fasync_helper(fd, filp, on, &file->async_queue);
 421 }
 422
 423 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 424 {
 425         struct ib_uverbs_event_file *file = filp->private_data;
 426         struct ib_uverbs_event *entry, *tmp;
 427         int closed_already = 0;
 428
 429         mutex_lock(&file->uverbs_file->device->lists_mutex);
 430         spin_lock_irq(&file->lock);
 431         closed_already = file->is_closed;
 432         file->is_closed = 1;
 433         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 434                 if (entry->counter)
 435                         list_del(&entry->obj_list);
 436                 kfree(entry);
 437         }
 438         spin_unlock_irq(&file->lock);
 439         if (!closed_already) {
 440                 list_del(&file->list);
 441                 if (file->is_async)
 442                         ib_unregister_event_handler(&file->uverbs_file->
 443                                 event_handler);
 444         }
 445         mutex_unlock(&file->uverbs_file->device->lists_mutex);
 446
 447         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 448         kref_put(&file->ref, ib_uverbs_release_event_file);
 449
 450         return 0;
 451 }
 452
 453 static const struct file_operations uverbs_event_fops = {
 454         .owner   = THIS_MODULE,
 455         .read    = ib_uverbs_event_read,
 456         .poll    = ib_uverbs_event_poll,
 457         .release = ib_uverbs_event_close,
 458         .fasync  = ib_uverbs_event_fasync,
 459         .llseek  = no_llseek,
 460 };
 461
 462 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 463 {
 464         struct ib_uverbs_event_file    *file = cq_context;
 465         struct ib_ucq_object           *uobj;
 466         struct ib_uverbs_event         *entry;
 467         unsigned long                   flags;
 468
 469         if (!file)
 470                 return;
 471
 472         spin_lock_irqsave(&file->lock, flags);
 473         if (file->is_closed) {
 474                 spin_unlock_irqrestore(&file->lock, flags);
 475                 return;
 476         }
 477
 478         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 479         if (!entry) {
 480                 spin_unlock_irqrestore(&file->lock, flags);
 481                 return;
 482         }
 483
 484         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 485
 486         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 487         entry->counter             = &uobj->comp_events_reported;
 488
 489         list_add_tail(&entry->list, &file->event_list);
 490         list_add_tail(&entry->obj_list, &uobj->comp_list);
 491         spin_unlock_irqrestore(&file->lock, flags);
 492
 493         wake_up_interruptible(&file->poll_wait);
 494         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 495 }
 496
 497 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 498                                     __u64 element, __u64 event,
 499                                     struct list_head *obj_list,
 500                                     u32 *counter)
 501 {
 502         struct ib_uverbs_event *entry;
 503         unsigned long flags;
 504
 505         spin_lock_irqsave(&file->async_file->lock, flags);
 506         if (file->async_file->is_closed) {
 507                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 508                 return;
 509         }
 510
 511         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 512         if (!entry) {
 513                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 514                 return;
 515         }
 516
 517         entry->desc.async.element    = element;
 518         entry->desc.async.event_type = event;
 519         entry->desc.async.reserved   = 0;
 520         entry->counter               = counter;
 521
 522         list_add_tail(&entry->list, &file->async_file->event_list);
 523         if (obj_list)
 524                 list_add_tail(&entry->obj_list, obj_list);
 525         spin_unlock_irqrestore(&file->async_file->lock, flags);
 526
 527         wake_up_interruptible(&file->async_file->poll_wait);
 528         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 529 }
 530
 531 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 532 {
 533         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 534                                                   struct ib_ucq_object, uobject);
 535
 536         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 537                                 event->event, &uobj->async_list,
 538                                 &uobj->async_events_reported);
 539 }
 540
 541 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 542 {
 543         struct ib_uevent_object *uobj;
 544
 545         /* for XRC target qp's, check that qp is live */
 546         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
 547                 return;
 548
 549         uobj = container_of(event->element.qp->uobject,
 550                             struct ib_uevent_object, uobject);
 551
 552         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 553                                 event->event, &uobj->event_list,
 554                                 &uobj->events_reported);
 555 }
 556
 557 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 558 {
 559         struct ib_uevent_object *uobj;
 560
 561         uobj = container_of(event->element.srq->uobject,
 562                             struct ib_uevent_object, uobject);
 563
 564         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 565                                 event->event, &uobj->event_list,
 566                                 &uobj->events_reported);
 567 }
 568
 569 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 570                              struct ib_event *event)
 571 {
 572         struct ib_uverbs_file *file =
 573                 container_of(handler, struct ib_uverbs_file, event_handler);
 574
 575         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 576                                 NULL, NULL);
 577 }
 578
 579 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 580 {
 581         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 582         file->async_file = NULL;
 583 }
 584
 585 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 586                                         struct ib_device        *ib_dev,
 587                                         int is_async)
 588 {
 589         struct ib_uverbs_event_file *ev_file;
 590         struct file *filp;
 591         int ret;
 592
 593         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 594         if (!ev_file)
 595                 return ERR_PTR(-ENOMEM);
 596
 597         kref_init(&ev_file->ref);
 598         spin_lock_init(&ev_file->lock);
 599         INIT_LIST_HEAD(&ev_file->event_list);
 600         init_waitqueue_head(&ev_file->poll_wait);
 601         ev_file->uverbs_file = uverbs_file;
 602         kref_get(&ev_file->uverbs_file->ref);
 603         ev_file->async_queue = NULL;
 604         ev_file->is_closed   = 0;
 605
 606         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 607                                   ev_file, O_RDONLY);
 608         if (IS_ERR(filp))
 609                 goto err_put_refs;
 610
 611         mutex_lock(&uverbs_file->device->lists_mutex);
 612         list_add_tail(&ev_file->list,
 613                       &uverbs_file->device->uverbs_events_file_list);
 614         mutex_unlock(&uverbs_file->device->lists_mutex);
 615
 616         if (is_async) {
 617                 WARN_ON(uverbs_file->async_file);
 618                 uverbs_file->async_file = ev_file;
 619                 kref_get(&uverbs_file->async_file->ref);
 620                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 621                                       ib_dev,
 622                                       ib_uverbs_event_handler);
 623                 ret = ib_register_event_handler(&uverbs_file->event_handler);
 624                 if (ret)
 625                         goto err_put_file;
 626
 627                 /* At that point async file stuff was fully set */
 628                 ev_file->is_async = 1;
 629         }
 630
 631         return filp;
 632
 633 err_put_file:
 634         fput(filp);
 635         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
 636         uverbs_file->async_file = NULL;
 637         return ERR_PTR(ret);
 638
 639 err_put_refs:
 640         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 641         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 642         return filp;
 643 }
 644
 645 /*
 646  * Look up a completion event file by FD.  If lookup is successful,
 647  * takes a ref to the event file struct that it returns; if
 648  * unsuccessful, returns NULL.
 649  */
 650 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 651 {
 652         struct ib_uverbs_event_file *ev_file = NULL;
 653         struct fd f = fdget(fd);
 654
 655         if (!f.file)
 656                 return NULL;
 657
 658         if (f.file->f_op != &uverbs_event_fops)
 659                 goto out;
 660
 661         ev_file = f.file->private_data;
 662         if (ev_file->is_async) {
 663                 ev_file = NULL;
 664                 goto out;
 665         }
 666
 667         kref_get(&ev_file->ref);
 668
 669 out:
 670         fdput(f);
 671         return ev_file;
 672 }
 673
 674 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 675                              size_t count, loff_t *pos)
 676 {
 677         struct ib_uverbs_file *file = filp->private_data;
 678         struct ib_device *ib_dev;
 679         struct ib_uverbs_cmd_hdr hdr;
 680         __u32 flags;
 681         int srcu_key;
 682         ssize_t ret;
 683
 684         if (WARN_ON_ONCE(!ib_safe_file_access(filp)))
 685                 return -EACCES;
 686
 687         if (count < sizeof hdr)
 688                 return -EINVAL;
 689
 690         if (copy_from_user(&hdr, buf, sizeof hdr))
 691                 return -EFAULT;
 692
 693         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 694         ib_dev = srcu_dereference(file->device->ib_dev,
 695                                   &file->device->disassociate_srcu);
 696         if (!ib_dev) {
 697                 ret = -EIO;
 698                 goto out;
 699         }
 700
 701         flags = (hdr.command &
 702                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 703
 704         if (!flags) {
 705                 __u32 command;
 706
 707                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 708                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 709                         ret = -EINVAL;
 710                         goto out;
 711                 }
 712
 713                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 714
 715                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 716                     !uverbs_cmd_table[command]) {
 717                         ret = -EINVAL;
 718                         goto out;
 719                 }
 720
 721                 if (!file->ucontext &&
 722                     command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 723                         ret = -EINVAL;
 724                         goto out;
 725                 }
 726
 727                 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
 728                         ret = -ENOSYS;
 729                         goto out;
 730                 }
 731
 732                 if (hdr.in_words * 4 != count) {
 733                         ret = -EINVAL;
 734                         goto out;
 735                 }
 736
 737                 ret = uverbs_cmd_table[command](file, ib_dev,
 738                                                  buf + sizeof(hdr),
 739                                                  hdr.in_words * 4,
 740                                                  hdr.out_words * 4);
 741
 742         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 743                 __u32 command;
 744
 745                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 746                 struct ib_udata ucore;
 747                 struct ib_udata uhw;
 748                 size_t written_count = count;
 749
 750                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 751                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 752                         ret = -EINVAL;
 753                         goto out;
 754                 }
 755
 756                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 757
 758                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 759                     !uverbs_ex_cmd_table[command]) {
 760                         ret = -ENOSYS;
 761                         goto out;
 762                 }
 763
 764                 if (!file->ucontext) {
 765                         ret = -EINVAL;
 766                         goto out;
 767                 }
 768
 769                 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
 770                         ret = -ENOSYS;
 771                         goto out;
 772                 }
 773
 774                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 775                         ret = -EINVAL;
 776                         goto out;
 777                 }
 778
 779                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 780                         ret = -EFAULT;
 781                         goto out;
 782                 }
 783
 784                 count -= sizeof(hdr) + sizeof(ex_hdr);
 785                 buf += sizeof(hdr) + sizeof(ex_hdr);
 786
 787                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 788                         ret = -EINVAL;
 789                         goto out;
 790                 }
 791
 792                 if (ex_hdr.cmd_hdr_reserved) {
 793                         ret = -EINVAL;
 794                         goto out;
 795                 }
 796
 797                 if (ex_hdr.response) {
 798                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 799                                 ret = -EINVAL;
 800                                 goto out;
 801                         }
 802
 803                         if (!access_ok(VERIFY_WRITE,
 804                                        (void __user *) (unsigned long) ex_hdr.response,
 805                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 806                                 ret = -EFAULT;
 807                                 goto out;
 808                         }
 809                 } else {
 810                         if (hdr.out_words || ex_hdr.provider_out_words) {
 811                                 ret = -EINVAL;
 812                                 goto out;
 813                         }
 814                 }
 815
 816                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 817                                        hdr.in_words * 8, hdr.out_words * 8);
 818
 819                 INIT_UDATA_BUF_OR_NULL(&uhw,
 820                                        buf + ucore.inlen,
 821                                        (unsigned long) ex_hdr.response + ucore.outlen,
 822                                        ex_hdr.provider_in_words * 8,
 823                                        ex_hdr.provider_out_words * 8);
 824
 825                 ret = uverbs_ex_cmd_table[command](file,
 826                                                    ib_dev,
 827                                                    &ucore,
 828                                                    &uhw);
 829                 if (!ret)
 830                         ret = written_count;
 831         } else {
 832                 ret = -ENOSYS;
 833         }
 834
 835 out:
 836         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 837         return ret;
 838 }
 839
 840 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 841 {
 842         struct ib_uverbs_file *file = filp->private_data;
 843         struct ib_device *ib_dev;
 844         int ret = 0;
 845         int srcu_key;
 846
 847         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 848         ib_dev = srcu_dereference(file->device->ib_dev,
 849                                   &file->device->disassociate_srcu);
 850         if (!ib_dev) {
 851                 ret = -EIO;
 852                 goto out;
 853         }
 854
 855         if (!file->ucontext)
 856                 ret = -ENODEV;
 857         else
 858                 ret = ib_dev->mmap(file->ucontext, vma);
 859 out:
 860         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 861         return ret;
 862 }
 863
 864 /*
 865  * ib_uverbs_open() does not need the BKL:
 866  *
 867  *  - the ib_uverbs_device structures are properly reference counted and
 868  *    everything else is purely local to the file being created, so
 869  *    races against other open calls are not a problem;
 870  *  - there is no ioctl method to race against;
 871  *  - the open method will either immediately run -ENXIO, or all
 872  *    required initialization will be done.
 873  */
 874 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 875 {
 876         struct ib_uverbs_device *dev;
 877         struct ib_uverbs_file *file;
 878         struct ib_device *ib_dev;
 879         int ret;
 880         int module_dependent;
 881         int srcu_key;
 882
 883         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 884         if (!atomic_inc_not_zero(&dev->refcount))
 885                 return -ENXIO;
 886
 887         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 888         mutex_lock(&dev->lists_mutex);
 889         ib_dev = srcu_dereference(dev->ib_dev,
 890                                   &dev->disassociate_srcu);
 891         if (!ib_dev) {
 892                 ret = -EIO;
 893                 goto err;
 894         }
 895
 896         /* In case IB device supports disassociate ucontext, there is no hard
 897          * dependency between uverbs device and its low level device.
 898          */
 899         module_dependent = !(ib_dev->disassociate_ucontext);
 900
 901         if (module_dependent) {
 902                 if (!try_module_get(ib_dev->owner)) {
 903                         ret = -ENODEV;
 904                         goto err;
 905                 }
 906         }
 907
 908         file = kzalloc(sizeof(*file), GFP_KERNEL);
 909         if (!file) {
 910                 ret = -ENOMEM;
 911                 if (module_dependent)
 912                         goto err_module;
 913
 914                 goto err;
 915         }
 916
 917         file->device     = dev;
 918         file->ucontext   = NULL;
 919         file->async_file = NULL;
 920         kref_init(&file->ref);
 921         mutex_init(&file->mutex);
 922         mutex_init(&file->cleanup_mutex);
 923
 924         filp->private_data = file;
 925         kobject_get(&dev->kobj);
 926         list_add_tail(&file->list, &dev->uverbs_file_list);
 927         mutex_unlock(&dev->lists_mutex);
 928         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 929
 930         return nonseekable_open(inode, filp);
 931
 932 err_module:
 933         module_put(ib_dev->owner);
 934
 935 err:
 936         mutex_unlock(&dev->lists_mutex);
 937         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 938         if (atomic_dec_and_test(&dev->refcount))
 939                 ib_uverbs_comp_dev(dev);
 940
 941         return ret;
 942 }
 943
 944 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 945 {
 946         struct ib_uverbs_file *file = filp->private_data;
 947         struct ib_uverbs_device *dev = file->device;
 948
 949         mutex_lock(&file->cleanup_mutex);
 950         if (file->ucontext) {
 951                 ib_uverbs_cleanup_ucontext(file, file->ucontext);
 952                 file->ucontext = NULL;
 953         }
 954         mutex_unlock(&file->cleanup_mutex);
 955
 956         mutex_lock(&file->device->lists_mutex);
 957         if (!file->is_closed) {
 958                 list_del(&file->list);
 959                 file->is_closed = 1;
 960         }
 961         mutex_unlock(&file->device->lists_mutex);
 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                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1176                                         struct ib_uverbs_file, list);
1177                 file->is_closed = 1;
1178                 list_del(&file->list);
1179                 kref_get(&file->ref);
1180                 mutex_unlock(&uverbs_dev->lists_mutex);
1181
1182                 ib_uverbs_event_handler(&file->event_handler, &event);
1183
1184                 mutex_lock(&file->cleanup_mutex);
1185                 ucontext = file->ucontext;
1186                 file->ucontext = NULL;
1187                 mutex_unlock(&file->cleanup_mutex);
1188
1189                 /* At this point ib_uverbs_close cannot be running
1190                  * ib_uverbs_cleanup_ucontext
1191                  */
1192                 if (ucontext) {
1193                         /* We must release the mutex before going ahead and
1194                          * calling disassociate_ucontext. disassociate_ucontext
1195                          * might end up indirectly calling uverbs_close,
1196                          * for example due to freeing the resources
1197                          * (e.g mmput).
1198                          */
1199                         ib_dev->disassociate_ucontext(ucontext);
1200                         ib_uverbs_cleanup_ucontext(file, ucontext);
1201                 }
1202
1203                 mutex_lock(&uverbs_dev->lists_mutex);
1204                 kref_put(&file->ref, ib_uverbs_release_file);
1205         }
1206
1207         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1208                 event_file = list_first_entry(&uverbs_dev->
1209                                               uverbs_events_file_list,
1210                                               struct ib_uverbs_event_file,
1211                                               list);
1212                 spin_lock_irq(&event_file->lock);
1213                 event_file->is_closed = 1;
1214                 spin_unlock_irq(&event_file->lock);
1215
1216                 list_del(&event_file->list);
1217                 if (event_file->is_async) {
1218                         ib_unregister_event_handler(&event_file->uverbs_file->
1219                                                     event_handler);
1220                         event_file->uverbs_file->event_handler.device = NULL;
1221                 }
1222
1223                 wake_up_interruptible(&event_file->poll_wait);
1224                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1225         }
1226         mutex_unlock(&uverbs_dev->lists_mutex);
1227 }
1228
1229 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1230 {
1231         struct ib_uverbs_device *uverbs_dev = client_data;
1232         int wait_clients = 1;
1233
1234         if (!uverbs_dev)
1235                 return;
1236
1237         dev_set_drvdata(uverbs_dev->dev, NULL);
1238         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1239         cdev_del(&uverbs_dev->cdev);
1240
1241         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1242                 clear_bit(uverbs_dev->devnum, dev_map);
1243         else
1244                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1245
1246         if (device->disassociate_ucontext) {
1247                 /* We disassociate HW resources and immediately return.
1248                  * Userspace will see a EIO errno for all future access.
1249                  * Upon returning, ib_device may be freed internally and is not
1250                  * valid any more.
1251                  * uverbs_device is still available until all clients close
1252                  * their files, then the uverbs device ref count will be zero
1253                  * and its resources will be freed.
1254                  * Note: At this point no more files can be opened since the
1255                  * cdev was deleted, however active clients can still issue
1256                  * commands and close their open files.
1257                  */
1258                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1259                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1260                 wait_clients = 0;
1261         }
1262
1263         if (atomic_dec_and_test(&uverbs_dev->refcount))
1264                 ib_uverbs_comp_dev(uverbs_dev);
1265         if (wait_clients)
1266                 wait_for_completion(&uverbs_dev->comp);
1267         kobject_put(&uverbs_dev->kobj);
1268 }
1269
1270 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1271 {
1272         if (mode)
1273                 *mode = 0666;
1274         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1275 }
1276
1277 static int __init ib_uverbs_init(void)
1278 {
1279         int ret;
1280
1281         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1282                                      "infiniband_verbs");
1283         if (ret) {
1284                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1285                 goto out;
1286         }
1287
1288         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1289         if (IS_ERR(uverbs_class)) {
1290                 ret = PTR_ERR(uverbs_class);
1291                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1292                 goto out_chrdev;
1293         }
1294
1295         uverbs_class->devnode = uverbs_devnode;
1296
1297         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1298         if (ret) {
1299                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1300                 goto out_class;
1301         }
1302
1303         ret = ib_register_client(&uverbs_client);
1304         if (ret) {
1305                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1306                 goto out_class;
1307         }
1308
1309         return 0;
1310
1311 out_class:
1312         class_destroy(uverbs_class);
1313
1314 out_chrdev:
1315         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1316
1317 out:
1318         return ret;
1319 }
1320
1321 static void __exit ib_uverbs_cleanup(void)
1322 {
1323         ib_unregister_client(&uverbs_client);
1324         class_destroy(uverbs_class);
1325         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1326         if (overflow_maj)
1327                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1328         idr_destroy(&ib_uverbs_pd_idr);
1329         idr_destroy(&ib_uverbs_mr_idr);
1330         idr_destroy(&ib_uverbs_mw_idr);
1331         idr_destroy(&ib_uverbs_ah_idr);
1332         idr_destroy(&ib_uverbs_cq_idr);
1333         idr_destroy(&ib_uverbs_qp_idr);
1334         idr_destroy(&ib_uverbs_srq_idr);
1335 }
1336
1337 module_init(ib_uverbs_init);
1338 module_exit(ib_uverbs_cleanup);