git.oblomov.eu Git - linux-2.6/blob - 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_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
  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         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 187                 struct ib_ah *ah = uobj->object;
 188
 189                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 190                 ib_destroy_ah(ah);
 191                 list_del(&uobj->list);
 192                 kfree(uobj);
 193         }
 194
 195         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 196                 struct ib_qp *qp = uobj->object;
 197                 struct ib_uqp_object *uqp =
 198                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 199
 200                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 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 = uobj->object;
 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
 214                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 215                 ib_destroy_cq(cq);
 216                 list_del(&uobj->list);
 217                 ib_uverbs_release_ucq(file, ev_file, ucq);
 218                 kfree(ucq);
 219         }
 220
 221         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 222                 struct ib_srq *srq = uobj->object;
 223                 struct ib_uevent_object *uevent =
 224                         container_of(uobj, struct ib_uevent_object, uobject);
 225
 226                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 227                 ib_destroy_srq(srq);
 228                 list_del(&uobj->list);
 229                 ib_uverbs_release_uevent(file, uevent);
 230                 kfree(uevent);
 231         }
 232
 233         /* XXX Free MWs */
 234
 235         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 236                 struct ib_mr *mr = uobj->object;
 237                 struct ib_device *mrdev = mr->device;
 238                 struct ib_umem_object *memobj;
 239
 240                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 241                 ib_dereg_mr(mr);
 242
 243                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 244                 ib_umem_release_on_close(mrdev, &memobj->umem);
 245
 246                 list_del(&uobj->list);
 247                 kfree(memobj);
 248         }
 249
 250         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 251                 struct ib_pd *pd = uobj->object;
 252
 253                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 254                 ib_dealloc_pd(pd);
 255                 list_del(&uobj->list);
 256                 kfree(uobj);
 257         }
 258
 259         return context->device->dealloc_ucontext(context);
 260 }
 261
 262 static void ib_uverbs_release_file(struct kref *ref)
 263 {
 264         struct ib_uverbs_file *file =
 265                 container_of(ref, struct ib_uverbs_file, ref);
 266
 267         module_put(file->device->ib_dev->owner);
 268         kref_put(&file->device->ref, ib_uverbs_release_dev);
 269
 270         kfree(file);
 271 }
 272
 273 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 274                                     size_t count, loff_t *pos)
 275 {
 276         struct ib_uverbs_event_file *file = filp->private_data;
 277         struct ib_uverbs_event *event;
 278         int eventsz;
 279         int ret = 0;
 280
 281         spin_lock_irq(&file->lock);
 282
 283         while (list_empty(&file->event_list)) {
 284                 spin_unlock_irq(&file->lock);
 285
 286                 if (filp->f_flags & O_NONBLOCK)
 287                         return -EAGAIN;
 288
 289                 if (wait_event_interruptible(file->poll_wait,
 290                                              !list_empty(&file->event_list)))
 291                         return -ERESTARTSYS;
 292
 293                 spin_lock_irq(&file->lock);
 294         }
 295
 296         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 297
 298         if (file->is_async)
 299                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 300         else
 301                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 302
 303         if (eventsz > count) {
 304                 ret   = -EINVAL;
 305                 event = NULL;
 306         } else {
 307                 list_del(file->event_list.next);
 308                 if (event->counter) {
 309                         ++(*event->counter);
 310                         list_del(&event->obj_list);
 311                 }
 312         }
 313
 314         spin_unlock_irq(&file->lock);
 315
 316         if (event) {
 317                 if (copy_to_user(buf, event, eventsz))
 318                         ret = -EFAULT;
 319                 else
 320                         ret = eventsz;
 321         }
 322
 323         kfree(event);
 324
 325         return ret;
 326 }
 327
 328 static unsigned int ib_uverbs_event_poll(struct file *filp,
 329                                          struct poll_table_struct *wait)
 330 {
 331         unsigned int pollflags = 0;
 332         struct ib_uverbs_event_file *file = filp->private_data;
 333
 334         poll_wait(filp, &file->poll_wait, wait);
 335
 336         spin_lock_irq(&file->lock);
 337         if (!list_empty(&file->event_list))
 338                 pollflags = POLLIN | POLLRDNORM;
 339         spin_unlock_irq(&file->lock);
 340
 341         return pollflags;
 342 }
 343
 344 void ib_uverbs_release_event_file(struct kref *ref)
 345 {
 346         struct ib_uverbs_event_file *file =
 347                 container_of(ref, struct ib_uverbs_event_file, ref);
 348
 349         kfree(file);
 350 }
 351
 352 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 353 {
 354         struct ib_uverbs_event_file *file = filp->private_data;
 355
 356         return fasync_helper(fd, filp, on, &file->async_queue);
 357 }
 358
 359 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 360 {
 361         struct ib_uverbs_event_file *file = filp->private_data;
 362         struct ib_uverbs_event *entry, *tmp;
 363
 364         spin_lock_irq(&file->lock);
 365         file->file = NULL;
 366         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 367                 if (entry->counter)
 368                         list_del(&entry->obj_list);
 369                 kfree(entry);
 370         }
 371         spin_unlock_irq(&file->lock);
 372
 373         ib_uverbs_event_fasync(-1, filp, 0);
 374
 375         if (file->is_async) {
 376                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 377                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 378         }
 379         kref_put(&file->ref, ib_uverbs_release_event_file);
 380
 381         return 0;
 382 }
 383
 384 static struct file_operations uverbs_event_fops = {
 385         .owner   = THIS_MODULE,
 386         .read    = ib_uverbs_event_read,
 387         .poll    = ib_uverbs_event_poll,
 388         .release = ib_uverbs_event_close,
 389         .fasync  = ib_uverbs_event_fasync
 390 };
 391
 392 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 393 {
 394         struct ib_uverbs_event_file    *file = cq_context;
 395         struct ib_ucq_object           *uobj;
 396         struct ib_uverbs_event         *entry;
 397         unsigned long                   flags;
 398
 399         if (!file)
 400                 return;
 401
 402         spin_lock_irqsave(&file->lock, flags);
 403         if (!file->file) {
 404                 spin_unlock_irqrestore(&file->lock, flags);
 405                 return;
 406         }
 407
 408         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 409         if (!entry) {
 410                 spin_unlock_irqrestore(&file->lock, flags);
 411                 return;
 412         }
 413
 414         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 415
 416         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 417         entry->counter             = &uobj->comp_events_reported;
 418
 419         list_add_tail(&entry->list, &file->event_list);
 420         list_add_tail(&entry->obj_list, &uobj->comp_list);
 421         spin_unlock_irqrestore(&file->lock, flags);
 422
 423         wake_up_interruptible(&file->poll_wait);
 424         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 425 }
 426
 427 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 428                                     __u64 element, __u64 event,
 429                                     struct list_head *obj_list,
 430                                     u32 *counter)
 431 {
 432         struct ib_uverbs_event *entry;
 433         unsigned long flags;
 434
 435         spin_lock_irqsave(&file->async_file->lock, flags);
 436         if (!file->async_file->file) {
 437                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 438                 return;
 439         }
 440
 441         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 442         if (!entry) {
 443                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 444                 return;
 445         }
 446
 447         entry->desc.async.element    = element;
 448         entry->desc.async.event_type = event;
 449         entry->counter               = counter;
 450
 451         list_add_tail(&entry->list, &file->async_file->event_list);
 452         if (obj_list)
 453                 list_add_tail(&entry->obj_list, obj_list);
 454         spin_unlock_irqrestore(&file->async_file->lock, flags);
 455
 456         wake_up_interruptible(&file->async_file->poll_wait);
 457         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 458 }
 459
 460 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 461 {
 462         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 463                                                   struct ib_ucq_object, uobject);
 464
 465         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 466                                 event->event, &uobj->async_list,
 467                                 &uobj->async_events_reported);
 468 }
 469
 470 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 471 {
 472         struct ib_uevent_object *uobj;
 473
 474         uobj = container_of(event->element.qp->uobject,
 475                             struct ib_uevent_object, uobject);
 476
 477         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 478                                 event->event, &uobj->event_list,
 479                                 &uobj->events_reported);
 480 }
 481
 482 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 483 {
 484         struct ib_uevent_object *uobj;
 485
 486         uobj = container_of(event->element.srq->uobject,
 487                             struct ib_uevent_object, uobject);
 488
 489         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 490                                 event->event, &uobj->event_list,
 491                                 &uobj->events_reported);
 492 }
 493
 494 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 495                              struct ib_event *event)
 496 {
 497         struct ib_uverbs_file *file =
 498                 container_of(handler, struct ib_uverbs_file, event_handler);
 499
 500         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 501                                 NULL, NULL);
 502 }
 503
 504 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 505                                         int is_async, int *fd)
 506 {
 507         struct ib_uverbs_event_file *ev_file;
 508         struct file *filp;
 509         int ret;
 510
 511         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 512         if (!ev_file)
 513                 return ERR_PTR(-ENOMEM);
 514
 515         kref_init(&ev_file->ref);
 516         spin_lock_init(&ev_file->lock);
 517         INIT_LIST_HEAD(&ev_file->event_list);
 518         init_waitqueue_head(&ev_file->poll_wait);
 519         ev_file->uverbs_file = uverbs_file;
 520         ev_file->async_queue = NULL;
 521         ev_file->is_async    = is_async;
 522
 523         *fd = get_unused_fd();
 524         if (*fd < 0) {
 525                 ret = *fd;
 526                 goto err;
 527         }
 528
 529         filp = get_empty_filp();
 530         if (!filp) {
 531                 ret = -ENFILE;
 532                 goto err_fd;
 533         }
 534
 535         ev_file->file      = filp;
 536
 537         /*
 538          * fops_get() can't fail here, because we're coming from a
 539          * system call on a uverbs file, which will already have a
 540          * module reference.
 541          */
 542         filp->f_op         = fops_get(&uverbs_event_fops);
 543         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 544         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 545         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 546         filp->f_flags      = O_RDONLY;
 547         filp->f_mode       = FMODE_READ;
 548         filp->private_data = ev_file;
 549
 550         return filp;
 551
 552 err_fd:
 553         put_unused_fd(*fd);
 554
 555 err:
 556         kfree(ev_file);
 557         return ERR_PTR(ret);
 558 }
 559
 560 /*
 561  * Look up a completion event file by FD.  If lookup is successful,
 562  * takes a ref to the event file struct that it returns; if
 563  * unsuccessful, returns NULL.
 564  */
 565 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 566 {
 567         struct ib_uverbs_event_file *ev_file = NULL;
 568         struct file *filp;
 569
 570         filp = fget(fd);
 571         if (!filp)
 572                 return NULL;
 573
 574         if (filp->f_op != &uverbs_event_fops)
 575                 goto out;
 576
 577         ev_file = filp->private_data;
 578         if (ev_file->is_async) {
 579                 ev_file = NULL;
 580                 goto out;
 581         }
 582
 583         kref_get(&ev_file->ref);
 584
 585 out:
 586         fput(filp);
 587         return ev_file;
 588 }
 589
 590 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 591                              size_t count, loff_t *pos)
 592 {
 593         struct ib_uverbs_file *file = filp->private_data;
 594         struct ib_uverbs_cmd_hdr hdr;
 595
 596         if (count < sizeof hdr)
 597                 return -EINVAL;
 598
 599         if (copy_from_user(&hdr, buf, sizeof hdr))
 600                 return -EFAULT;
 601
 602         if (hdr.in_words * 4 != count)
 603                 return -EINVAL;
 604
 605         if (hdr.command < 0                             ||
 606             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 607             !uverbs_cmd_table[hdr.command]              ||
 608             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 609                 return -EINVAL;
 610
 611         if (!file->ucontext &&
 612             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 613                 return -EINVAL;
 614
 615         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 616                                              hdr.in_words * 4, hdr.out_words * 4);
 617 }
 618
 619 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 620 {
 621         struct ib_uverbs_file *file = filp->private_data;
 622
 623         if (!file->ucontext)
 624                 return -ENODEV;
 625         else
 626                 return file->device->ib_dev->mmap(file->ucontext, vma);
 627 }
 628
 629 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 630 {
 631         struct ib_uverbs_device *dev;
 632         struct ib_uverbs_file *file;
 633         int ret;
 634
 635         spin_lock(&map_lock);
 636         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
 637         if (dev)
 638                 kref_get(&dev->ref);
 639         spin_unlock(&map_lock);
 640
 641         if (!dev)
 642                 return -ENXIO;
 643
 644         if (!try_module_get(dev->ib_dev->owner)) {
 645                 ret = -ENODEV;
 646                 goto err;
 647         }
 648
 649         file = kmalloc(sizeof *file, GFP_KERNEL);
 650         if (!file) {
 651                 ret = -ENOMEM;
 652                 goto err_module;
 653         }
 654
 655         file->device     = dev;
 656         file->ucontext   = NULL;
 657         file->async_file = NULL;
 658         kref_init(&file->ref);
 659         mutex_init(&file->mutex);
 660
 661         filp->private_data = file;
 662
 663         return 0;
 664
 665 err_module:
 666         module_put(dev->ib_dev->owner);
 667
 668 err:
 669         kref_put(&dev->ref, ib_uverbs_release_dev);
 670
 671         return ret;
 672 }
 673
 674 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 675 {
 676         struct ib_uverbs_file *file = filp->private_data;
 677
 678         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 679
 680         if (file->async_file)
 681                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 682
 683         kref_put(&file->ref, ib_uverbs_release_file);
 684
 685         return 0;
 686 }
 687
 688 static struct file_operations uverbs_fops = {
 689         .owner   = THIS_MODULE,
 690         .write   = ib_uverbs_write,
 691         .open    = ib_uverbs_open,
 692         .release = ib_uverbs_close
 693 };
 694
 695 static struct file_operations uverbs_mmap_fops = {
 696         .owner   = THIS_MODULE,
 697         .write   = ib_uverbs_write,
 698         .mmap    = ib_uverbs_mmap,
 699         .open    = ib_uverbs_open,
 700         .release = ib_uverbs_close
 701 };
 702
 703 static struct ib_client uverbs_client = {
 704         .name   = "uverbs",
 705         .add    = ib_uverbs_add_one,
 706         .remove = ib_uverbs_remove_one
 707 };
 708
 709 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 710 {
 711         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 712
 713         if (!dev)
 714                 return -ENODEV;
 715
 716         return sprintf(buf, "%s\n", dev->ib_dev->name);
 717 }
 718 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 719
 720 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
 721 {
 722         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 723
 724         if (!dev)
 725                 return -ENODEV;
 726
 727         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 728 }
 729 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 730
 731 static ssize_t show_abi_version(struct class *class, char *buf)
 732 {
 733         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 734 }
 735 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 736
 737 static void ib_uverbs_add_one(struct ib_device *device)
 738 {
 739         struct ib_uverbs_device *uverbs_dev;
 740
 741         if (!device->alloc_ucontext)
 742                 return;
 743
 744         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 745         if (!uverbs_dev)
 746                 return;
 747
 748         kref_init(&uverbs_dev->ref);
 749
 750         spin_lock(&map_lock);
 751         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 752         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 753                 spin_unlock(&map_lock);
 754                 goto err;
 755         }
 756         set_bit(uverbs_dev->devnum, dev_map);
 757         spin_unlock(&map_lock);
 758
 759         uverbs_dev->ib_dev           = device;
 760         uverbs_dev->num_comp_vectors = 1;
 761
 762         uverbs_dev->dev = cdev_alloc();
 763         if (!uverbs_dev->dev)
 764                 goto err;
 765         uverbs_dev->dev->owner = THIS_MODULE;
 766         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 767         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
 768         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 769                 goto err_cdev;
 770
 771         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
 772                                                     uverbs_dev->dev->dev,
 773                                                     device->dma_device,
 774                                                     "uverbs%d", uverbs_dev->devnum);
 775         if (IS_ERR(uverbs_dev->class_dev))
 776                 goto err_cdev;
 777
 778         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
 779
 780         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
 781                 goto err_class;
 782         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
 783                 goto err_class;
 784
 785         spin_lock(&map_lock);
 786         dev_table[uverbs_dev->devnum] = uverbs_dev;
 787         spin_unlock(&map_lock);
 788
 789         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 790
 791         return;
 792
 793 err_class:
 794         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 795
 796 err_cdev:
 797         cdev_del(uverbs_dev->dev);
 798         clear_bit(uverbs_dev->devnum, dev_map);
 799
 800 err:
 801         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 802         return;
 803 }
 804
 805 static void ib_uverbs_remove_one(struct ib_device *device)
 806 {
 807         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 808
 809         if (!uverbs_dev)
 810                 return;
 811
 812         class_set_devdata(uverbs_dev->class_dev, NULL);
 813         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 814         cdev_del(uverbs_dev->dev);
 815
 816         spin_lock(&map_lock);
 817         dev_table[uverbs_dev->devnum] = NULL;
 818         spin_unlock(&map_lock);
 819
 820         clear_bit(uverbs_dev->devnum, dev_map);
 821         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 822 }
 823
 824 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 825                                                const char *dev_name, void *data)
 826 {
 827         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 828                              INFINIBANDEVENTFS_MAGIC);
 829 }
 830
 831 static struct file_system_type uverbs_event_fs = {
 832         /* No owner field so module can be unloaded */
 833         .name    = "infinibandeventfs",
 834         .get_sb  = uverbs_event_get_sb,
 835         .kill_sb = kill_litter_super
 836 };
 837
 838 static int __init ib_uverbs_init(void)
 839 {
 840         int ret;
 841
 842         spin_lock_init(&map_lock);
 843
 844         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 845                                      "infiniband_verbs");
 846         if (ret) {
 847                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 848                 goto out;
 849         }
 850
 851         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 852         if (IS_ERR(uverbs_class)) {
 853                 ret = PTR_ERR(uverbs_class);
 854                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 855                 goto out_chrdev;
 856         }
 857
 858         ret = class_create_file(uverbs_class, &class_attr_abi_version);
 859         if (ret) {
 860                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 861                 goto out_class;
 862         }
 863
 864         ret = register_filesystem(&uverbs_event_fs);
 865         if (ret) {
 866                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 867                 goto out_class;
 868         }
 869
 870         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 871         if (IS_ERR(uverbs_event_mnt)) {
 872                 ret = PTR_ERR(uverbs_event_mnt);
 873                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 874                 goto out_fs;
 875         }
 876
 877         ret = ib_register_client(&uverbs_client);
 878         if (ret) {
 879                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 880                 goto out_mnt;
 881         }
 882
 883         return 0;
 884
 885 out_mnt:
 886         mntput(uverbs_event_mnt);
 887
 888 out_fs:
 889         unregister_filesystem(&uverbs_event_fs);
 890
 891 out_class:
 892         class_destroy(uverbs_class);
 893
 894 out_chrdev:
 895         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 896
 897 out:
 898         return ret;
 899 }
 900
 901 static void __exit ib_uverbs_cleanup(void)
 902 {
 903         ib_unregister_client(&uverbs_client);
 904         mntput(uverbs_event_mnt);
 905         unregister_filesystem(&uverbs_event_fs);
 906         class_destroy(uverbs_class);
 907         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 908         flush_scheduled_work();
 909         idr_destroy(&ib_uverbs_pd_idr);
 910         idr_destroy(&ib_uverbs_mr_idr);
 911         idr_destroy(&ib_uverbs_mw_idr);
 912         idr_destroy(&ib_uverbs_ah_idr);
 913         idr_destroy(&ib_uverbs_cq_idr);
 914         idr_destroy(&ib_uverbs_qp_idr);
 915         idr_destroy(&ib_uverbs_srq_idr);
 916 }
 917
 918 module_init(ib_uverbs_init);
 919 module_exit(ib_uverbs_cleanup);