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  * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
  37  */
  38
  39 #include <linux/module.h>
  40 #include <linux/init.h>
  41 #include <linux/device.h>
  42 #include <linux/err.h>
  43 #include <linux/fs.h>
  44 #include <linux/poll.h>
  45 #include <linux/file.h>
  46 #include <linux/mount.h>
  47 #include <linux/cdev.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 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  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_MUTEX(ib_uverbs_idr_mutex);
  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
  78 static spinlock_t map_lock;
  79 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
  80 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  81
  82 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  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_DEREG_MR]            = ib_uverbs_dereg_mr,
  92         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  93         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  94         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  95         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  96         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  97         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  98         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  99         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 100         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 101         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 102         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 103         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 104         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 105         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 106         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 107         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 108         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 109         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 110         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 111         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 112         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 113 };
 114
 115 static struct vfsmount *uverbs_event_mnt;
 116
 117 static void ib_uverbs_add_one(struct ib_device *device);
 118 static void ib_uverbs_remove_one(struct ib_device *device);
 119
 120 static void ib_uverbs_release_dev(struct kref *ref)
 121 {
 122         struct ib_uverbs_device *dev =
 123                 container_of(ref, struct ib_uverbs_device, ref);
 124
 125         kfree(dev);
 126 }
 127
 128 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 129                           struct ib_uverbs_event_file *ev_file,
 130                           struct ib_ucq_object *uobj)
 131 {
 132         struct ib_uverbs_event *evt, *tmp;
 133
 134         if (ev_file) {
 135                 spin_lock_irq(&ev_file->lock);
 136                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 137                         list_del(&evt->list);
 138                         kfree(evt);
 139                 }
 140                 spin_unlock_irq(&ev_file->lock);
 141
 142                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 143         }
 144
 145         spin_lock_irq(&file->async_file->lock);
 146         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 147                 list_del(&evt->list);
 148                 kfree(evt);
 149         }
 150         spin_unlock_irq(&file->async_file->lock);
 151 }
 152
 153 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 154                               struct ib_uevent_object *uobj)
 155 {
 156         struct ib_uverbs_event *evt, *tmp;
 157
 158         spin_lock_irq(&file->async_file->lock);
 159         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 160                 list_del(&evt->list);
 161                 kfree(evt);
 162         }
 163         spin_unlock_irq(&file->async_file->lock);
 164 }
 165
 166 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 167                                     struct ib_uqp_object *uobj)
 168 {
 169         struct ib_uverbs_mcast_entry *mcast, *tmp;
 170
 171         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 172                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 173                 list_del(&mcast->list);
 174                 kfree(mcast);
 175         }
 176 }
 177
 178 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 179                                       struct ib_ucontext *context)
 180 {
 181         struct ib_uobject *uobj, *tmp;
 182
 183         if (!context)
 184                 return 0;
 185
 186         mutex_lock(&ib_uverbs_idr_mutex);
 187
 188         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 189                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
 190                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
 191                 ib_destroy_ah(ah);
 192                 list_del(&uobj->list);
 193                 kfree(uobj);
 194         }
 195
 196         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 197                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 198                 struct ib_uqp_object *uqp =
 199                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 200                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 201                 ib_uverbs_detach_umcast(qp, uqp);
 202                 ib_destroy_qp(qp);
 203                 list_del(&uobj->list);
 204                 ib_uverbs_release_uevent(file, &uqp->uevent);
 205                 kfree(uqp);
 206         }
 207
 208         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 209                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 210                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 211                 struct ib_ucq_object *ucq =
 212                         container_of(uobj, struct ib_ucq_object, uobject);
 213                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 214                 ib_destroy_cq(cq);
 215                 list_del(&uobj->list);
 216                 ib_uverbs_release_ucq(file, ev_file, ucq);
 217                 kfree(ucq);
 218         }
 219
 220         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 221                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
 222                 struct ib_uevent_object *uevent =
 223                         container_of(uobj, struct ib_uevent_object, uobject);
 224                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
 225                 ib_destroy_srq(srq);
 226                 list_del(&uobj->list);
 227                 ib_uverbs_release_uevent(file, uevent);
 228                 kfree(uevent);
 229         }
 230
 231         /* XXX Free MWs */
 232
 233         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 234                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 235                 struct ib_device *mrdev = mr->device;
 236                 struct ib_umem_object *memobj;
 237
 238                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 239                 ib_dereg_mr(mr);
 240
 241                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 242                 ib_umem_release_on_close(mrdev, &memobj->umem);
 243
 244                 list_del(&uobj->list);
 245                 kfree(memobj);
 246         }
 247
 248         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 249                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 250                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 251                 ib_dealloc_pd(pd);
 252                 list_del(&uobj->list);
 253                 kfree(uobj);
 254         }
 255
 256         mutex_unlock(&ib_uverbs_idr_mutex);
 257
 258         return context->device->dealloc_ucontext(context);
 259 }
 260
 261 static void ib_uverbs_release_file(struct kref *ref)
 262 {
 263         struct ib_uverbs_file *file =
 264                 container_of(ref, struct ib_uverbs_file, ref);
 265
 266         module_put(file->device->ib_dev->owner);
 267         kref_put(&file->device->ref, ib_uverbs_release_dev);
 268
 269         kfree(file);
 270 }
 271
 272 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 273                                     size_t count, loff_t *pos)
 274 {
 275         struct ib_uverbs_event_file *file = filp->private_data;
 276         struct ib_uverbs_event *event;
 277         int eventsz;
 278         int ret = 0;
 279
 280         spin_lock_irq(&file->lock);
 281
 282         while (list_empty(&file->event_list)) {
 283                 spin_unlock_irq(&file->lock);
 284
 285                 if (filp->f_flags & O_NONBLOCK)
 286                         return -EAGAIN;
 287
 288                 if (wait_event_interruptible(file->poll_wait,
 289                                              !list_empty(&file->event_list)))
 290                         return -ERESTARTSYS;
 291
 292                 spin_lock_irq(&file->lock);
 293         }
 294
 295         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 296
 297         if (file->is_async)
 298                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 299         else
 300                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 301
 302         if (eventsz > count) {
 303                 ret   = -EINVAL;
 304                 event = NULL;
 305         } else {
 306                 list_del(file->event_list.next);
 307                 if (event->counter) {
 308                         ++(*event->counter);
 309                         list_del(&event->obj_list);
 310                 }
 311         }
 312
 313         spin_unlock_irq(&file->lock);
 314
 315         if (event) {
 316                 if (copy_to_user(buf, event, eventsz))
 317                         ret = -EFAULT;
 318                 else
 319                         ret = eventsz;
 320         }
 321
 322         kfree(event);
 323
 324         return ret;
 325 }
 326
 327 static unsigned int ib_uverbs_event_poll(struct file *filp,
 328                                          struct poll_table_struct *wait)
 329 {
 330         unsigned int pollflags = 0;
 331         struct ib_uverbs_event_file *file = filp->private_data;
 332
 333         poll_wait(filp, &file->poll_wait, wait);
 334
 335         spin_lock_irq(&file->lock);
 336         if (!list_empty(&file->event_list))
 337                 pollflags = POLLIN | POLLRDNORM;
 338         spin_unlock_irq(&file->lock);
 339
 340         return pollflags;
 341 }
 342
 343 void ib_uverbs_release_event_file(struct kref *ref)
 344 {
 345         struct ib_uverbs_event_file *file =
 346                 container_of(ref, struct ib_uverbs_event_file, ref);
 347
 348         kfree(file);
 349 }
 350
 351 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 352 {
 353         struct ib_uverbs_event_file *file = filp->private_data;
 354
 355         return fasync_helper(fd, filp, on, &file->async_queue);
 356 }
 357
 358 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 359 {
 360         struct ib_uverbs_event_file *file = filp->private_data;
 361         struct ib_uverbs_event *entry, *tmp;
 362
 363         spin_lock_irq(&file->lock);
 364         file->file = NULL;
 365         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 366                 if (entry->counter)
 367                         list_del(&entry->obj_list);
 368                 kfree(entry);
 369         }
 370         spin_unlock_irq(&file->lock);
 371
 372         ib_uverbs_event_fasync(-1, filp, 0);
 373
 374         if (file->is_async) {
 375                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 376                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 377         }
 378         kref_put(&file->ref, ib_uverbs_release_event_file);
 379
 380         return 0;
 381 }
 382
 383 static struct file_operations uverbs_event_fops = {
 384         .owner   = THIS_MODULE,
 385         .read    = ib_uverbs_event_read,
 386         .poll    = ib_uverbs_event_poll,
 387         .release = ib_uverbs_event_close,
 388         .fasync  = ib_uverbs_event_fasync
 389 };
 390
 391 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 392 {
 393         struct ib_uverbs_event_file    *file = cq_context;
 394         struct ib_ucq_object           *uobj;
 395         struct ib_uverbs_event         *entry;
 396         unsigned long                   flags;
 397
 398         if (!file)
 399                 return;
 400
 401         spin_lock_irqsave(&file->lock, flags);
 402         if (!file->file) {
 403                 spin_unlock_irqrestore(&file->lock, flags);
 404                 return;
 405         }
 406
 407         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 408         if (!entry) {
 409                 spin_unlock_irqrestore(&file->lock, flags);
 410                 return;
 411         }
 412
 413         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 414
 415         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 416         entry->counter             = &uobj->comp_events_reported;
 417
 418         list_add_tail(&entry->list, &file->event_list);
 419         list_add_tail(&entry->obj_list, &uobj->comp_list);
 420         spin_unlock_irqrestore(&file->lock, flags);
 421
 422         wake_up_interruptible(&file->poll_wait);
 423         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 424 }
 425
 426 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 427                                     __u64 element, __u64 event,
 428                                     struct list_head *obj_list,
 429                                     u32 *counter)
 430 {
 431         struct ib_uverbs_event *entry;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&file->async_file->lock, flags);
 435         if (!file->async_file->file) {
 436                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 437                 return;
 438         }
 439
 440         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 441         if (!entry) {
 442                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 443                 return;
 444         }
 445
 446         entry->desc.async.element    = element;
 447         entry->desc.async.event_type = event;
 448         entry->counter               = counter;
 449
 450         list_add_tail(&entry->list, &file->async_file->event_list);
 451         if (obj_list)
 452                 list_add_tail(&entry->obj_list, obj_list);
 453         spin_unlock_irqrestore(&file->async_file->lock, flags);
 454
 455         wake_up_interruptible(&file->async_file->poll_wait);
 456         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 457 }
 458
 459 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 460 {
 461         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 462                                                   struct ib_ucq_object, uobject);
 463
 464         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 465                                 event->event, &uobj->async_list,
 466                                 &uobj->async_events_reported);
 467 }
 468
 469 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 470 {
 471         struct ib_uevent_object *uobj;
 472
 473         uobj = container_of(event->element.qp->uobject,
 474                             struct ib_uevent_object, uobject);
 475
 476         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 477                                 event->event, &uobj->event_list,
 478                                 &uobj->events_reported);
 479 }
 480
 481 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 482 {
 483         struct ib_uevent_object *uobj;
 484
 485         uobj = container_of(event->element.srq->uobject,
 486                             struct ib_uevent_object, uobject);
 487
 488         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 489                                 event->event, &uobj->event_list,
 490                                 &uobj->events_reported);
 491 }
 492
 493 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 494                              struct ib_event *event)
 495 {
 496         struct ib_uverbs_file *file =
 497                 container_of(handler, struct ib_uverbs_file, event_handler);
 498
 499         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 500                                 NULL, NULL);
 501 }
 502
 503 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 504                                         int is_async, int *fd)
 505 {
 506         struct ib_uverbs_event_file *ev_file;
 507         struct file *filp;
 508         int ret;
 509
 510         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 511         if (!ev_file)
 512                 return ERR_PTR(-ENOMEM);
 513
 514         kref_init(&ev_file->ref);
 515         spin_lock_init(&ev_file->lock);
 516         INIT_LIST_HEAD(&ev_file->event_list);
 517         init_waitqueue_head(&ev_file->poll_wait);
 518         ev_file->uverbs_file = uverbs_file;
 519         ev_file->async_queue = NULL;
 520         ev_file->is_async    = is_async;
 521
 522         *fd = get_unused_fd();
 523         if (*fd < 0) {
 524                 ret = *fd;
 525                 goto err;
 526         }
 527
 528         filp = get_empty_filp();
 529         if (!filp) {
 530                 ret = -ENFILE;
 531                 goto err_fd;
 532         }
 533
 534         ev_file->file      = filp;
 535
 536         /*
 537          * fops_get() can't fail here, because we're coming from a
 538          * system call on a uverbs file, which will already have a
 539          * module reference.
 540          */
 541         filp->f_op         = fops_get(&uverbs_event_fops);
 542         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 543         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 544         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 545         filp->f_flags      = O_RDONLY;
 546         filp->f_mode       = FMODE_READ;
 547         filp->private_data = ev_file;
 548
 549         return filp;
 550
 551 err_fd:
 552         put_unused_fd(*fd);
 553
 554 err:
 555         kfree(ev_file);
 556         return ERR_PTR(ret);
 557 }
 558
 559 /*
 560  * Look up a completion event file by FD.  If lookup is successful,
 561  * takes a ref to the event file struct that it returns; if
 562  * unsuccessful, returns NULL.
 563  */
 564 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 565 {
 566         struct ib_uverbs_event_file *ev_file = NULL;
 567         struct file *filp;
 568
 569         filp = fget(fd);
 570         if (!filp)
 571                 return NULL;
 572
 573         if (filp->f_op != &uverbs_event_fops)
 574                 goto out;
 575
 576         ev_file = filp->private_data;
 577         if (ev_file->is_async) {
 578                 ev_file = NULL;
 579                 goto out;
 580         }
 581
 582         kref_get(&ev_file->ref);
 583
 584 out:
 585         fput(filp);
 586         return ev_file;
 587 }
 588
 589 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 590                              size_t count, loff_t *pos)
 591 {
 592         struct ib_uverbs_file *file = filp->private_data;
 593         struct ib_uverbs_cmd_hdr hdr;
 594
 595         if (count < sizeof hdr)
 596                 return -EINVAL;
 597
 598         if (copy_from_user(&hdr, buf, sizeof hdr))
 599                 return -EFAULT;
 600
 601         if (hdr.in_words * 4 != count)
 602                 return -EINVAL;
 603
 604         if (hdr.command < 0                             ||
 605             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 606             !uverbs_cmd_table[hdr.command]              ||
 607             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 608                 return -EINVAL;
 609
 610         if (!file->ucontext &&
 611             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 612                 return -EINVAL;
 613
 614         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 615                                              hdr.in_words * 4, hdr.out_words * 4);
 616 }
 617
 618 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 619 {
 620         struct ib_uverbs_file *file = filp->private_data;
 621
 622         if (!file->ucontext)
 623                 return -ENODEV;
 624         else
 625                 return file->device->ib_dev->mmap(file->ucontext, vma);
 626 }
 627
 628 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 629 {
 630         struct ib_uverbs_device *dev;
 631         struct ib_uverbs_file *file;
 632         int ret;
 633
 634         spin_lock(&map_lock);
 635         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
 636         if (dev)
 637                 kref_get(&dev->ref);
 638         spin_unlock(&map_lock);
 639
 640         if (!dev)
 641                 return -ENXIO;
 642
 643         if (!try_module_get(dev->ib_dev->owner)) {
 644                 ret = -ENODEV;
 645                 goto err;
 646         }
 647
 648         file = kmalloc(sizeof *file, GFP_KERNEL);
 649         if (!file) {
 650                 ret = -ENOMEM;
 651                 goto err_module;
 652         }
 653
 654         file->device     = dev;
 655         file->ucontext   = NULL;
 656         file->async_file = NULL;
 657         kref_init(&file->ref);
 658         mutex_init(&file->mutex);
 659
 660         filp->private_data = file;
 661
 662         return 0;
 663
 664 err_module:
 665         module_put(dev->ib_dev->owner);
 666
 667 err:
 668         kref_put(&dev->ref, ib_uverbs_release_dev);
 669
 670         return ret;
 671 }
 672
 673 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 674 {
 675         struct ib_uverbs_file *file = filp->private_data;
 676
 677         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 678
 679         if (file->async_file)
 680                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 681
 682         kref_put(&file->ref, ib_uverbs_release_file);
 683
 684         return 0;
 685 }
 686
 687 static struct file_operations uverbs_fops = {
 688         .owner   = THIS_MODULE,
 689         .write   = ib_uverbs_write,
 690         .open    = ib_uverbs_open,
 691         .release = ib_uverbs_close
 692 };
 693
 694 static struct file_operations uverbs_mmap_fops = {
 695         .owner   = THIS_MODULE,
 696         .write   = ib_uverbs_write,
 697         .mmap    = ib_uverbs_mmap,
 698         .open    = ib_uverbs_open,
 699         .release = ib_uverbs_close
 700 };
 701
 702 static struct ib_client uverbs_client = {
 703         .name   = "uverbs",
 704         .add    = ib_uverbs_add_one,
 705         .remove = ib_uverbs_remove_one
 706 };
 707
 708 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 709 {
 710         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 711
 712         if (!dev)
 713                 return -ENODEV;
 714
 715         return sprintf(buf, "%s\n", dev->ib_dev->name);
 716 }
 717 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 718
 719 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
 720 {
 721         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 722
 723         if (!dev)
 724                 return -ENODEV;
 725
 726         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 727 }
 728 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 729
 730 static ssize_t show_abi_version(struct class *class, char *buf)
 731 {
 732         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 733 }
 734 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 735
 736 static void ib_uverbs_add_one(struct ib_device *device)
 737 {
 738         struct ib_uverbs_device *uverbs_dev;
 739
 740         if (!device->alloc_ucontext)
 741                 return;
 742
 743         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 744         if (!uverbs_dev)
 745                 return;
 746
 747         kref_init(&uverbs_dev->ref);
 748
 749         spin_lock(&map_lock);
 750         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 751         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 752                 spin_unlock(&map_lock);
 753                 goto err;
 754         }
 755         set_bit(uverbs_dev->devnum, dev_map);
 756         spin_unlock(&map_lock);
 757
 758         uverbs_dev->ib_dev           = device;
 759         uverbs_dev->num_comp_vectors = 1;
 760
 761         uverbs_dev->dev = cdev_alloc();
 762         if (!uverbs_dev->dev)
 763                 goto err;
 764         uverbs_dev->dev->owner = THIS_MODULE;
 765         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 766         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
 767         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 768                 goto err_cdev;
 769
 770         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
 771                                                     uverbs_dev->dev->dev,
 772                                                     device->dma_device,
 773                                                     "uverbs%d", uverbs_dev->devnum);
 774         if (IS_ERR(uverbs_dev->class_dev))
 775                 goto err_cdev;
 776
 777         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
 778
 779         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
 780                 goto err_class;
 781         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
 782                 goto err_class;
 783
 784         spin_lock(&map_lock);
 785         dev_table[uverbs_dev->devnum] = uverbs_dev;
 786         spin_unlock(&map_lock);
 787
 788         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 789
 790         return;
 791
 792 err_class:
 793         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 794
 795 err_cdev:
 796         cdev_del(uverbs_dev->dev);
 797         clear_bit(uverbs_dev->devnum, dev_map);
 798
 799 err:
 800         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 801         return;
 802 }
 803
 804 static void ib_uverbs_remove_one(struct ib_device *device)
 805 {
 806         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 807
 808         if (!uverbs_dev)
 809                 return;
 810
 811         class_set_devdata(uverbs_dev->class_dev, NULL);
 812         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 813         cdev_del(uverbs_dev->dev);
 814
 815         spin_lock(&map_lock);
 816         dev_table[uverbs_dev->devnum] = NULL;
 817         spin_unlock(&map_lock);
 818
 819         clear_bit(uverbs_dev->devnum, dev_map);
 820         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 821 }
 822
 823 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 824                                                const char *dev_name, void *data)
 825 {
 826         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 827                              INFINIBANDEVENTFS_MAGIC);
 828 }
 829
 830 static struct file_system_type uverbs_event_fs = {
 831         /* No owner field so module can be unloaded */
 832         .name    = "infinibandeventfs",
 833         .get_sb  = uverbs_event_get_sb,
 834         .kill_sb = kill_litter_super
 835 };
 836
 837 static int __init ib_uverbs_init(void)
 838 {
 839         int ret;
 840
 841         spin_lock_init(&map_lock);
 842
 843         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 844                                      "infiniband_verbs");
 845         if (ret) {
 846                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 847                 goto out;
 848         }
 849
 850         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 851         if (IS_ERR(uverbs_class)) {
 852                 ret = PTR_ERR(uverbs_class);
 853                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 854                 goto out_chrdev;
 855         }
 856
 857         ret = class_create_file(uverbs_class, &class_attr_abi_version);
 858         if (ret) {
 859                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 860                 goto out_class;
 861         }
 862
 863         ret = register_filesystem(&uverbs_event_fs);
 864         if (ret) {
 865                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 866                 goto out_class;
 867         }
 868
 869         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 870         if (IS_ERR(uverbs_event_mnt)) {
 871                 ret = PTR_ERR(uverbs_event_mnt);
 872                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 873                 goto out_fs;
 874         }
 875
 876         ret = ib_register_client(&uverbs_client);
 877         if (ret) {
 878                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 879                 goto out_mnt;
 880         }
 881
 882         return 0;
 883
 884 out_mnt:
 885         mntput(uverbs_event_mnt);
 886
 887 out_fs:
 888         unregister_filesystem(&uverbs_event_fs);
 889
 890 out_class:
 891         class_destroy(uverbs_class);
 892
 893 out_chrdev:
 894         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 895
 896 out:
 897         return ret;
 898 }
 899
 900 static void __exit ib_uverbs_cleanup(void)
 901 {
 902         ib_unregister_client(&uverbs_client);
 903         mntput(uverbs_event_mnt);
 904         unregister_filesystem(&uverbs_event_fs);
 905         class_destroy(uverbs_class);
 906         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 907         flush_scheduled_work();
 908         idr_destroy(&ib_uverbs_pd_idr);
 909         idr_destroy(&ib_uverbs_mr_idr);
 910         idr_destroy(&ib_uverbs_mw_idr);
 911         idr_destroy(&ib_uverbs_ah_idr);
 912         idr_destroy(&ib_uverbs_cq_idr);
 913         idr_destroy(&ib_uverbs_qp_idr);
 914         idr_destroy(&ib_uverbs_srq_idr);
 915 }
 916
 917 module_init(ib_uverbs_init);
 918 module_exit(ib_uverbs_cleanup);