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