drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/poll.h>
  43 #include <linux/sched.h>
  44 #include <linux/file.h>
  45 #include <linux/cdev.h>
  46 #include <linux/anon_inodes.h>
  47 #include <linux/slab.h>
  48
  49 #include <asm/uaccess.h>
  50
  51 #include "uverbs.h"
  52
  53 MODULE_AUTHOR("Roland Dreier");
  54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 enum {
  58         IB_UVERBS_MAJOR       = 231,
  59         IB_UVERBS_BASE_MINOR  = 192,
  60         IB_UVERBS_MAX_DEVICES = 32
  61 };
  62
  63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  64
  65 static struct class *uverbs_class;
  66
  67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  68 DEFINE_IDR(ib_uverbs_pd_idr);
  69 DEFINE_IDR(ib_uverbs_mr_idr);
  70 DEFINE_IDR(ib_uverbs_mw_idr);
  71 DEFINE_IDR(ib_uverbs_ah_idr);
  72 DEFINE_IDR(ib_uverbs_cq_idr);
  73 DEFINE_IDR(ib_uverbs_qp_idr);
  74 DEFINE_IDR(ib_uverbs_srq_idr);
  75 DEFINE_IDR(ib_uverbs_xrcd_idr);
  76 DEFINE_IDR(ib_uverbs_rule_idr);
  77
  78 static DEFINE_SPINLOCK(map_lock);
  79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  80
  81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  82                                      struct ib_device *ib_dev,
  83                                      const char __user *buf, int in_len,
  84                                      int out_len) = {
  85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  91         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  92         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  93         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  94         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  95         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  96         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  97         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  98         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  99         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 100         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
 101         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 102         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 103         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 104         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 105         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 106         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 107         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 108         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 109         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 110         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 111         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 112         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 113         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 114         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 115         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 116         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 117         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 118         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 119         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 120 };
 121
 122 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 123                                     struct ib_device *ib_dev,
 124                                     struct ib_udata *ucore,
 125                                     struct ib_udata *uhw) = {
 126         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 127         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 128         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 129         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 130 };
 131
 132 static void ib_uverbs_add_one(struct ib_device *device);
 133 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 134
 135 static void ib_uverbs_release_dev(struct kobject *kobj)
 136 {
 137         struct ib_uverbs_device *dev =
 138                 container_of(kobj, struct ib_uverbs_device, kobj);
 139
 140         cleanup_srcu_struct(&dev->disassociate_srcu);
 141         kfree(dev);
 142 }
 143
 144 static struct kobj_type ib_uverbs_dev_ktype = {
 145         .release = ib_uverbs_release_dev,
 146 };
 147
 148 static void ib_uverbs_release_event_file(struct kref *ref)
 149 {
 150         struct ib_uverbs_event_file *file =
 151                 container_of(ref, struct ib_uverbs_event_file, ref);
 152
 153         kfree(file);
 154 }
 155
 156 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 157                           struct ib_uverbs_event_file *ev_file,
 158                           struct ib_ucq_object *uobj)
 159 {
 160         struct ib_uverbs_event *evt, *tmp;
 161
 162         if (ev_file) {
 163                 spin_lock_irq(&ev_file->lock);
 164                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 165                         list_del(&evt->list);
 166                         kfree(evt);
 167                 }
 168                 spin_unlock_irq(&ev_file->lock);
 169
 170                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 171         }
 172
 173         spin_lock_irq(&file->async_file->lock);
 174         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 175                 list_del(&evt->list);
 176                 kfree(evt);
 177         }
 178         spin_unlock_irq(&file->async_file->lock);
 179 }
 180
 181 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 182                               struct ib_uevent_object *uobj)
 183 {
 184         struct ib_uverbs_event *evt, *tmp;
 185
 186         spin_lock_irq(&file->async_file->lock);
 187         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 188                 list_del(&evt->list);
 189                 kfree(evt);
 190         }
 191         spin_unlock_irq(&file->async_file->lock);
 192 }
 193
 194 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 195                                     struct ib_uqp_object *uobj)
 196 {
 197         struct ib_uverbs_mcast_entry *mcast, *tmp;
 198
 199         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 200                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 201                 list_del(&mcast->list);
 202                 kfree(mcast);
 203         }
 204 }
 205
 206 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 207                                       struct ib_ucontext *context)
 208 {
 209         struct ib_uobject *uobj, *tmp;
 210
 211         context->closing = 1;
 212
 213         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 214                 struct ib_ah *ah = uobj->object;
 215
 216                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 217                 ib_destroy_ah(ah);
 218                 kfree(uobj);
 219         }
 220
 221         /* Remove MWs before QPs, in order to support type 2A MWs. */
 222         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 223                 struct ib_mw *mw = uobj->object;
 224
 225                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 226                 ib_dealloc_mw(mw);
 227                 kfree(uobj);
 228         }
 229
 230         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 231                 struct ib_flow *flow_id = uobj->object;
 232
 233                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 234                 ib_destroy_flow(flow_id);
 235                 kfree(uobj);
 236         }
 237
 238         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 239                 struct ib_qp *qp = uobj->object;
 240                 struct ib_uqp_object *uqp =
 241                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 242
 243                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 244                 if (qp != qp->real_qp) {
 245                         ib_close_qp(qp);
 246                 } else {
 247                         ib_uverbs_detach_umcast(qp, uqp);
 248                         ib_destroy_qp(qp);
 249                 }
 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 (count < sizeof hdr)
 685                 return -EINVAL;
 686
 687         if (copy_from_user(&hdr, buf, sizeof hdr))
 688                 return -EFAULT;
 689
 690         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 691         ib_dev = srcu_dereference(file->device->ib_dev,
 692                                   &file->device->disassociate_srcu);
 693         if (!ib_dev) {
 694                 ret = -EIO;
 695                 goto out;
 696         }
 697
 698         flags = (hdr.command &
 699                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 700
 701         if (!flags) {
 702                 __u32 command;
 703
 704                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 705                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 706                         ret = -EINVAL;
 707                         goto out;
 708                 }
 709
 710                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 711
 712                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 713                     !uverbs_cmd_table[command]) {
 714                         ret = -EINVAL;
 715                         goto out;
 716                 }
 717
 718                 if (!file->ucontext &&
 719                     command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 720                         ret = -EINVAL;
 721                         goto out;
 722                 }
 723
 724                 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) {
 725                         ret = -ENOSYS;
 726                         goto out;
 727                 }
 728
 729                 if (hdr.in_words * 4 != count) {
 730                         ret = -EINVAL;
 731                         goto out;
 732                 }
 733
 734                 ret = uverbs_cmd_table[command](file, ib_dev,
 735                                                  buf + sizeof(hdr),
 736                                                  hdr.in_words * 4,
 737                                                  hdr.out_words * 4);
 738
 739         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 740                 __u32 command;
 741
 742                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 743                 struct ib_udata ucore;
 744                 struct ib_udata uhw;
 745                 size_t written_count = count;
 746
 747                 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 748                                            IB_USER_VERBS_CMD_COMMAND_MASK)) {
 749                         ret = -EINVAL;
 750                         goto out;
 751                 }
 752
 753                 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 754
 755                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 756                     !uverbs_ex_cmd_table[command]) {
 757                         ret = -ENOSYS;
 758                         goto out;
 759                 }
 760
 761                 if (!file->ucontext) {
 762                         ret = -EINVAL;
 763                         goto out;
 764                 }
 765
 766                 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) {
 767                         ret = -ENOSYS;
 768                         goto out;
 769                 }
 770
 771                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 772                         ret = -EINVAL;
 773                         goto out;
 774                 }
 775
 776                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 777                         ret = -EFAULT;
 778                         goto out;
 779                 }
 780
 781                 count -= sizeof(hdr) + sizeof(ex_hdr);
 782                 buf += sizeof(hdr) + sizeof(ex_hdr);
 783
 784                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 785                         ret = -EINVAL;
 786                         goto out;
 787                 }
 788
 789                 if (ex_hdr.cmd_hdr_reserved) {
 790                         ret = -EINVAL;
 791                         goto out;
 792                 }
 793
 794                 if (ex_hdr.response) {
 795                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 796                                 ret = -EINVAL;
 797                                 goto out;
 798                         }
 799
 800                         if (!access_ok(VERIFY_WRITE,
 801                                        (void __user *) (unsigned long) ex_hdr.response,
 802                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 803                                 ret = -EFAULT;
 804                                 goto out;
 805                         }
 806                 } else {
 807                         if (hdr.out_words || ex_hdr.provider_out_words) {
 808                                 ret = -EINVAL;
 809                                 goto out;
 810                         }
 811                 }
 812
 813                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 814                                        hdr.in_words * 8, hdr.out_words * 8);
 815
 816                 INIT_UDATA_BUF_OR_NULL(&uhw,
 817                                        buf + ucore.inlen,
 818                                        (unsigned long) ex_hdr.response + ucore.outlen,
 819                                        ex_hdr.provider_in_words * 8,
 820                                        ex_hdr.provider_out_words * 8);
 821
 822                 ret = uverbs_ex_cmd_table[command](file,
 823                                                    ib_dev,
 824                                                    &ucore,
 825                                                    &uhw);
 826                 if (!ret)
 827                         ret = written_count;
 828         } else {
 829                 ret = -ENOSYS;
 830         }
 831
 832 out:
 833         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 834         return ret;
 835 }
 836
 837 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 838 {
 839         struct ib_uverbs_file *file = filp->private_data;
 840         struct ib_device *ib_dev;
 841         int ret = 0;
 842         int srcu_key;
 843
 844         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 845         ib_dev = srcu_dereference(file->device->ib_dev,
 846                                   &file->device->disassociate_srcu);
 847         if (!ib_dev) {
 848                 ret = -EIO;
 849                 goto out;
 850         }
 851
 852         if (!file->ucontext)
 853                 ret = -ENODEV;
 854         else
 855                 ret = ib_dev->mmap(file->ucontext, vma);
 856 out:
 857         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 858         return ret;
 859 }
 860
 861 /*
 862  * ib_uverbs_open() does not need the BKL:
 863  *
 864  *  - the ib_uverbs_device structures are properly reference counted and
 865  *    everything else is purely local to the file being created, so
 866  *    races against other open calls are not a problem;
 867  *  - there is no ioctl method to race against;
 868  *  - the open method will either immediately run -ENXIO, or all
 869  *    required initialization will be done.
 870  */
 871 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 872 {
 873         struct ib_uverbs_device *dev;
 874         struct ib_uverbs_file *file;
 875         struct ib_device *ib_dev;
 876         int ret;
 877         int module_dependent;
 878         int srcu_key;
 879
 880         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 881         if (!atomic_inc_not_zero(&dev->refcount))
 882                 return -ENXIO;
 883
 884         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 885         mutex_lock(&dev->lists_mutex);
 886         ib_dev = srcu_dereference(dev->ib_dev,
 887                                   &dev->disassociate_srcu);
 888         if (!ib_dev) {
 889                 ret = -EIO;
 890                 goto err;
 891         }
 892
 893         /* In case IB device supports disassociate ucontext, there is no hard
 894          * dependency between uverbs device and its low level device.
 895          */
 896         module_dependent = !(ib_dev->disassociate_ucontext);
 897
 898         if (module_dependent) {
 899                 if (!try_module_get(ib_dev->owner)) {
 900                         ret = -ENODEV;
 901                         goto err;
 902                 }
 903         }
 904
 905         file = kzalloc(sizeof(*file), GFP_KERNEL);
 906         if (!file) {
 907                 ret = -ENOMEM;
 908                 if (module_dependent)
 909                         goto err_module;
 910
 911                 goto err;
 912         }
 913
 914         file->device     = dev;
 915         file->ucontext   = NULL;
 916         file->async_file = NULL;
 917         kref_init(&file->ref);
 918         mutex_init(&file->mutex);
 919
 920         filp->private_data = file;
 921         kobject_get(&dev->kobj);
 922         list_add_tail(&file->list, &dev->uverbs_file_list);
 923         mutex_unlock(&dev->lists_mutex);
 924         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 925
 926         return nonseekable_open(inode, filp);
 927
 928 err_module:
 929         module_put(ib_dev->owner);
 930
 931 err:
 932         mutex_unlock(&dev->lists_mutex);
 933         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 934         if (atomic_dec_and_test(&dev->refcount))
 935                 ib_uverbs_comp_dev(dev);
 936
 937         return ret;
 938 }
 939
 940 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 941 {
 942         struct ib_uverbs_file *file = filp->private_data;
 943         struct ib_uverbs_device *dev = file->device;
 944         struct ib_ucontext *ucontext = NULL;
 945
 946         mutex_lock(&file->device->lists_mutex);
 947         ucontext = file->ucontext;
 948         file->ucontext = NULL;
 949         if (!file->is_closed) {
 950                 list_del(&file->list);
 951                 file->is_closed = 1;
 952         }
 953         mutex_unlock(&file->device->lists_mutex);
 954         if (ucontext)
 955                 ib_uverbs_cleanup_ucontext(file, ucontext);
 956
 957         if (file->async_file)
 958                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 959
 960         kref_put(&file->ref, ib_uverbs_release_file);
 961         kobject_put(&dev->kobj);
 962
 963         return 0;
 964 }
 965
 966 static const struct file_operations uverbs_fops = {
 967         .owner   = THIS_MODULE,
 968         .write   = ib_uverbs_write,
 969         .open    = ib_uverbs_open,
 970         .release = ib_uverbs_close,
 971         .llseek  = no_llseek,
 972 };
 973
 974 static const struct file_operations uverbs_mmap_fops = {
 975         .owner   = THIS_MODULE,
 976         .write   = ib_uverbs_write,
 977         .mmap    = ib_uverbs_mmap,
 978         .open    = ib_uverbs_open,
 979         .release = ib_uverbs_close,
 980         .llseek  = no_llseek,
 981 };
 982
 983 static struct ib_client uverbs_client = {
 984         .name   = "uverbs",
 985         .add    = ib_uverbs_add_one,
 986         .remove = ib_uverbs_remove_one
 987 };
 988
 989 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 990                           char *buf)
 991 {
 992         int ret = -ENODEV;
 993         int srcu_key;
 994         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 995         struct ib_device *ib_dev;
 996
 997         if (!dev)
 998                 return -ENODEV;
 999
1000         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1001         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1002         if (ib_dev)
1003                 ret = sprintf(buf, "%s\n", ib_dev->name);
1004         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1005
1006         return ret;
1007 }
1008 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1009
1010 static ssize_t show_dev_abi_version(struct device *device,
1011                                     struct device_attribute *attr, char *buf)
1012 {
1013         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1014         int ret = -ENODEV;
1015         int srcu_key;
1016         struct ib_device *ib_dev;
1017
1018         if (!dev)
1019                 return -ENODEV;
1020         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1021         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1022         if (ib_dev)
1023                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1024         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1025
1026         return ret;
1027 }
1028 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1029
1030 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1031                          __stringify(IB_USER_VERBS_ABI_VERSION));
1032
1033 static dev_t overflow_maj;
1034 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1035
1036 /*
1037  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1038  * requesting a new major number and doubling the number of max devices we
1039  * support. It's stupid, but simple.
1040  */
1041 static int find_overflow_devnum(void)
1042 {
1043         int ret;
1044
1045         if (!overflow_maj) {
1046                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1047                                           "infiniband_verbs");
1048                 if (ret) {
1049                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
1050                         return ret;
1051                 }
1052         }
1053
1054         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1055         if (ret >= IB_UVERBS_MAX_DEVICES)
1056                 return -1;
1057
1058         return ret;
1059 }
1060
1061 static void ib_uverbs_add_one(struct ib_device *device)
1062 {
1063         int devnum;
1064         dev_t base;
1065         struct ib_uverbs_device *uverbs_dev;
1066         int ret;
1067
1068         if (!device->alloc_ucontext)
1069                 return;
1070
1071         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1072         if (!uverbs_dev)
1073                 return;
1074
1075         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1076         if (ret) {
1077                 kfree(uverbs_dev);
1078                 return;
1079         }
1080
1081         atomic_set(&uverbs_dev->refcount, 1);
1082         init_completion(&uverbs_dev->comp);
1083         uverbs_dev->xrcd_tree = RB_ROOT;
1084         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1085         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1086         mutex_init(&uverbs_dev->lists_mutex);
1087         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1088         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1089
1090         spin_lock(&map_lock);
1091         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1092         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1093                 spin_unlock(&map_lock);
1094                 devnum = find_overflow_devnum();
1095                 if (devnum < 0)
1096                         goto err;
1097
1098                 spin_lock(&map_lock);
1099                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1100                 base = devnum + overflow_maj;
1101                 set_bit(devnum, overflow_map);
1102         } else {
1103                 uverbs_dev->devnum = devnum;
1104                 base = devnum + IB_UVERBS_BASE_DEV;
1105                 set_bit(devnum, dev_map);
1106         }
1107         spin_unlock(&map_lock);
1108
1109         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1110         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1111
1112         cdev_init(&uverbs_dev->cdev, NULL);
1113         uverbs_dev->cdev.owner = THIS_MODULE;
1114         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1115         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1116         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1117         if (cdev_add(&uverbs_dev->cdev, base, 1))
1118                 goto err_cdev;
1119
1120         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
1121                                         uverbs_dev->cdev.dev, uverbs_dev,
1122                                         "uverbs%d", uverbs_dev->devnum);
1123         if (IS_ERR(uverbs_dev->dev))
1124                 goto err_cdev;
1125
1126         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1127                 goto err_class;
1128         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1129                 goto err_class;
1130
1131         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1132
1133         return;
1134
1135 err_class:
1136         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1137
1138 err_cdev:
1139         cdev_del(&uverbs_dev->cdev);
1140         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1141                 clear_bit(devnum, dev_map);
1142         else
1143                 clear_bit(devnum, overflow_map);
1144
1145 err:
1146         if (atomic_dec_and_test(&uverbs_dev->refcount))
1147                 ib_uverbs_comp_dev(uverbs_dev);
1148         wait_for_completion(&uverbs_dev->comp);
1149         kobject_put(&uverbs_dev->kobj);
1150         return;
1151 }
1152
1153 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1154                                         struct ib_device *ib_dev)
1155 {
1156         struct ib_uverbs_file *file;
1157         struct ib_uverbs_event_file *event_file;
1158         struct ib_event event;
1159
1160         /* Pending running commands to terminate */
1161         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1162         event.event = IB_EVENT_DEVICE_FATAL;
1163         event.element.port_num = 0;
1164         event.device = ib_dev;
1165
1166         mutex_lock(&uverbs_dev->lists_mutex);
1167         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1168                 struct ib_ucontext *ucontext;
1169
1170                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1171                                         struct ib_uverbs_file, list);
1172                 file->is_closed = 1;
1173                 ucontext = file->ucontext;
1174                 list_del(&file->list);
1175                 file->ucontext = NULL;
1176                 kref_get(&file->ref);
1177                 mutex_unlock(&uverbs_dev->lists_mutex);
1178                 /* We must release the mutex before going ahead and calling
1179                  * disassociate_ucontext. disassociate_ucontext might end up
1180                  * indirectly calling uverbs_close, for example due to freeing
1181                  * the resources (e.g mmput).
1182                  */
1183                 ib_uverbs_event_handler(&file->event_handler, &event);
1184                 if (ucontext) {
1185                         ib_dev->disassociate_ucontext(ucontext);
1186                         ib_uverbs_cleanup_ucontext(file, ucontext);
1187                 }
1188
1189                 mutex_lock(&uverbs_dev->lists_mutex);
1190                 kref_put(&file->ref, ib_uverbs_release_file);
1191         }
1192
1193         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1194                 event_file = list_first_entry(&uverbs_dev->
1195                                               uverbs_events_file_list,
1196                                               struct ib_uverbs_event_file,
1197                                               list);
1198                 spin_lock_irq(&event_file->lock);
1199                 event_file->is_closed = 1;
1200                 spin_unlock_irq(&event_file->lock);
1201
1202                 list_del(&event_file->list);
1203                 if (event_file->is_async) {
1204                         ib_unregister_event_handler(&event_file->uverbs_file->
1205                                                     event_handler);
1206                         event_file->uverbs_file->event_handler.device = NULL;
1207                 }
1208
1209                 wake_up_interruptible(&event_file->poll_wait);
1210                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1211         }
1212         mutex_unlock(&uverbs_dev->lists_mutex);
1213 }
1214
1215 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1216 {
1217         struct ib_uverbs_device *uverbs_dev = client_data;
1218         int wait_clients = 1;
1219
1220         if (!uverbs_dev)
1221                 return;
1222
1223         dev_set_drvdata(uverbs_dev->dev, NULL);
1224         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1225         cdev_del(&uverbs_dev->cdev);
1226
1227         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1228                 clear_bit(uverbs_dev->devnum, dev_map);
1229         else
1230                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1231
1232         if (device->disassociate_ucontext) {
1233                 /* We disassociate HW resources and immediately return.
1234                  * Userspace will see a EIO errno for all future access.
1235                  * Upon returning, ib_device may be freed internally and is not
1236                  * valid any more.
1237                  * uverbs_device is still available until all clients close
1238                  * their files, then the uverbs device ref count will be zero
1239                  * and its resources will be freed.
1240                  * Note: At this point no more files can be opened since the
1241                  * cdev was deleted, however active clients can still issue
1242                  * commands and close their open files.
1243                  */
1244                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1245                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1246                 wait_clients = 0;
1247         }
1248
1249         if (atomic_dec_and_test(&uverbs_dev->refcount))
1250                 ib_uverbs_comp_dev(uverbs_dev);
1251         if (wait_clients)
1252                 wait_for_completion(&uverbs_dev->comp);
1253         kobject_put(&uverbs_dev->kobj);
1254 }
1255
1256 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1257 {
1258         if (mode)
1259                 *mode = 0666;
1260         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1261 }
1262
1263 static int __init ib_uverbs_init(void)
1264 {
1265         int ret;
1266
1267         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1268                                      "infiniband_verbs");
1269         if (ret) {
1270                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
1271                 goto out;
1272         }
1273
1274         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1275         if (IS_ERR(uverbs_class)) {
1276                 ret = PTR_ERR(uverbs_class);
1277                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
1278                 goto out_chrdev;
1279         }
1280
1281         uverbs_class->devnode = uverbs_devnode;
1282
1283         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1284         if (ret) {
1285                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
1286                 goto out_class;
1287         }
1288
1289         ret = ib_register_client(&uverbs_client);
1290         if (ret) {
1291                 printk(KERN_ERR "user_verbs: couldn't register client\n");
1292                 goto out_class;
1293         }
1294
1295         return 0;
1296
1297 out_class:
1298         class_destroy(uverbs_class);
1299
1300 out_chrdev:
1301         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1302
1303 out:
1304         return ret;
1305 }
1306
1307 static void __exit ib_uverbs_cleanup(void)
1308 {
1309         ib_unregister_client(&uverbs_client);
1310         class_destroy(uverbs_class);
1311         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1312         if (overflow_maj)
1313                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1314         idr_destroy(&ib_uverbs_pd_idr);
1315         idr_destroy(&ib_uverbs_mr_idr);
1316         idr_destroy(&ib_uverbs_mw_idr);
1317         idr_destroy(&ib_uverbs_ah_idr);
1318         idr_destroy(&ib_uverbs_cq_idr);
1319         idr_destroy(&ib_uverbs_qp_idr);
1320         idr_destroy(&ib_uverbs_srq_idr);
1321 }
1322
1323 module_init(ib_uverbs_init);
1324 module_exit(ib_uverbs_cleanup);