SAFE public projects git trees. - safe/jmp/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
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/poll.h>
  43 #include <linux/sched.h>
  44 #include <linux/file.h>
  45 #include <linux/mount.h>
  46
  47 #include <asm/uaccess.h>
  48
  49 #include "uverbs.h"
  50
  51 MODULE_AUTHOR("Roland Dreier");
  52 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  53 MODULE_LICENSE("Dual BSD/GPL");
  54
  55 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  56
  57 enum {
  58         IB_UVERBS_MAJOR       = 231,
  59         IB_UVERBS_BASE_MINOR  = 192,
  60         IB_UVERBS_MAX_DEVICES = 32
  61 };
  62
  63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  64
  65 static struct class *uverbs_class;
  66
  67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  68 DEFINE_IDR(ib_uverbs_pd_idr);
  69 DEFINE_IDR(ib_uverbs_mr_idr);
  70 DEFINE_IDR(ib_uverbs_mw_idr);
  71 DEFINE_IDR(ib_uverbs_ah_idr);
  72 DEFINE_IDR(ib_uverbs_cq_idr);
  73 DEFINE_IDR(ib_uverbs_qp_idr);
  74 DEFINE_IDR(ib_uverbs_srq_idr);
  75
  76 static DEFINE_SPINLOCK(map_lock);
  77 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
  78 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  79
  80 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  81                                      const char __user *buf, int in_len,
  82                                      int out_len) = {
  83         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  84         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  85         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  86         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  87         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  88         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  89         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  90         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  91         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  92         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  93         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  94         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  95         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  96         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  97         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
  98         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  99         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 100         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 101         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 102         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 103         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 104         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 105         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 106         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 107         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 108         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 109         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_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         complete(&dev->comp);
 124 }
 125
 126 static void ib_uverbs_release_event_file(struct kref *ref)
 127 {
 128         struct ib_uverbs_event_file *file =
 129                 container_of(ref, struct ib_uverbs_event_file, ref);
 130
 131         kfree(file);
 132 }
 133
 134 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 135                           struct ib_uverbs_event_file *ev_file,
 136                           struct ib_ucq_object *uobj)
 137 {
 138         struct ib_uverbs_event *evt, *tmp;
 139
 140         if (ev_file) {
 141                 spin_lock_irq(&ev_file->lock);
 142                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 143                         list_del(&evt->list);
 144                         kfree(evt);
 145                 }
 146                 spin_unlock_irq(&ev_file->lock);
 147
 148                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 149         }
 150
 151         spin_lock_irq(&file->async_file->lock);
 152         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 153                 list_del(&evt->list);
 154                 kfree(evt);
 155         }
 156         spin_unlock_irq(&file->async_file->lock);
 157 }
 158
 159 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 160                               struct ib_uevent_object *uobj)
 161 {
 162         struct ib_uverbs_event *evt, *tmp;
 163
 164         spin_lock_irq(&file->async_file->lock);
 165         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 166                 list_del(&evt->list);
 167                 kfree(evt);
 168         }
 169         spin_unlock_irq(&file->async_file->lock);
 170 }
 171
 172 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 173                                     struct ib_uqp_object *uobj)
 174 {
 175         struct ib_uverbs_mcast_entry *mcast, *tmp;
 176
 177         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 178                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 179                 list_del(&mcast->list);
 180                 kfree(mcast);
 181         }
 182 }
 183
 184 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 185                                       struct ib_ucontext *context)
 186 {
 187         struct ib_uobject *uobj, *tmp;
 188
 189         if (!context)
 190                 return 0;
 191
 192         context->closing = 1;
 193
 194         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 195                 struct ib_ah *ah = uobj->object;
 196
 197                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 198                 ib_destroy_ah(ah);
 199                 kfree(uobj);
 200         }
 201
 202         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 203                 struct ib_qp *qp = uobj->object;
 204                 struct ib_uqp_object *uqp =
 205                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 206
 207                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 208                 ib_uverbs_detach_umcast(qp, uqp);
 209                 ib_destroy_qp(qp);
 210                 ib_uverbs_release_uevent(file, &uqp->uevent);
 211                 kfree(uqp);
 212         }
 213
 214         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 215                 struct ib_cq *cq = uobj->object;
 216                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 217                 struct ib_ucq_object *ucq =
 218                         container_of(uobj, struct ib_ucq_object, uobject);
 219
 220                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 221                 ib_destroy_cq(cq);
 222                 ib_uverbs_release_ucq(file, ev_file, ucq);
 223                 kfree(ucq);
 224         }
 225
 226         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 227                 struct ib_srq *srq = uobj->object;
 228                 struct ib_uevent_object *uevent =
 229                         container_of(uobj, struct ib_uevent_object, uobject);
 230
 231                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 232                 ib_destroy_srq(srq);
 233                 ib_uverbs_release_uevent(file, uevent);
 234                 kfree(uevent);
 235         }
 236
 237         /* XXX Free MWs */
 238
 239         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 240                 struct ib_mr *mr = uobj->object;
 241
 242                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 243                 ib_dereg_mr(mr);
 244                 kfree(uobj);
 245         }
 246
 247         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 248                 struct ib_pd *pd = uobj->object;
 249
 250                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 251                 ib_dealloc_pd(pd);
 252                 kfree(uobj);
 253         }
 254
 255         return context->device->dealloc_ucontext(context);
 256 }
 257
 258 static void ib_uverbs_release_file(struct kref *ref)
 259 {
 260         struct ib_uverbs_file *file =
 261                 container_of(ref, struct ib_uverbs_file, ref);
 262
 263         module_put(file->device->ib_dev->owner);
 264         kref_put(&file->device->ref, ib_uverbs_release_dev);
 265
 266         kfree(file);
 267 }
 268
 269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 270                                     size_t count, loff_t *pos)
 271 {
 272         struct ib_uverbs_event_file *file = filp->private_data;
 273         struct ib_uverbs_event *event;
 274         int eventsz;
 275         int ret = 0;
 276
 277         spin_lock_irq(&file->lock);
 278
 279         while (list_empty(&file->event_list)) {
 280                 spin_unlock_irq(&file->lock);
 281
 282                 if (filp->f_flags & O_NONBLOCK)
 283                         return -EAGAIN;
 284
 285                 if (wait_event_interruptible(file->poll_wait,
 286                                              !list_empty(&file->event_list)))
 287                         return -ERESTARTSYS;
 288
 289                 spin_lock_irq(&file->lock);
 290         }
 291
 292         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 293
 294         if (file->is_async)
 295                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 296         else
 297                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 298
 299         if (eventsz > count) {
 300                 ret   = -EINVAL;
 301                 event = NULL;
 302         } else {
 303                 list_del(file->event_list.next);
 304                 if (event->counter) {
 305                         ++(*event->counter);
 306                         list_del(&event->obj_list);
 307                 }
 308         }
 309
 310         spin_unlock_irq(&file->lock);
 311
 312         if (event) {
 313                 if (copy_to_user(buf, event, eventsz))
 314                         ret = -EFAULT;
 315                 else
 316                         ret = eventsz;
 317         }
 318
 319         kfree(event);
 320
 321         return ret;
 322 }
 323
 324 static unsigned int ib_uverbs_event_poll(struct file *filp,
 325                                          struct poll_table_struct *wait)
 326 {
 327         unsigned int pollflags = 0;
 328         struct ib_uverbs_event_file *file = filp->private_data;
 329
 330         poll_wait(filp, &file->poll_wait, wait);
 331
 332         spin_lock_irq(&file->lock);
 333         if (!list_empty(&file->event_list))
 334                 pollflags = POLLIN | POLLRDNORM;
 335         spin_unlock_irq(&file->lock);
 336
 337         return pollflags;
 338 }
 339
 340 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 341 {
 342         struct ib_uverbs_event_file *file = filp->private_data;
 343
 344         return fasync_helper(fd, filp, on, &file->async_queue);
 345 }
 346
 347 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 348 {
 349         struct ib_uverbs_event_file *file = filp->private_data;
 350         struct ib_uverbs_event *entry, *tmp;
 351
 352         spin_lock_irq(&file->lock);
 353         file->is_closed = 1;
 354         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 355                 if (entry->counter)
 356                         list_del(&entry->obj_list);
 357                 kfree(entry);
 358         }
 359         spin_unlock_irq(&file->lock);
 360
 361         if (file->is_async) {
 362                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 363                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 364         }
 365         kref_put(&file->ref, ib_uverbs_release_event_file);
 366
 367         return 0;
 368 }
 369
 370 static const struct file_operations uverbs_event_fops = {
 371         .owner   = THIS_MODULE,
 372         .read    = ib_uverbs_event_read,
 373         .poll    = ib_uverbs_event_poll,
 374         .release = ib_uverbs_event_close,
 375         .fasync  = ib_uverbs_event_fasync
 376 };
 377
 378 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 379 {
 380         struct ib_uverbs_event_file    *file = cq_context;
 381         struct ib_ucq_object           *uobj;
 382         struct ib_uverbs_event         *entry;
 383         unsigned long                   flags;
 384
 385         if (!file)
 386                 return;
 387
 388         spin_lock_irqsave(&file->lock, flags);
 389         if (file->is_closed) {
 390                 spin_unlock_irqrestore(&file->lock, flags);
 391                 return;
 392         }
 393
 394         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 395         if (!entry) {
 396                 spin_unlock_irqrestore(&file->lock, flags);
 397                 return;
 398         }
 399
 400         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 401
 402         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 403         entry->counter             = &uobj->comp_events_reported;
 404
 405         list_add_tail(&entry->list, &file->event_list);
 406         list_add_tail(&entry->obj_list, &uobj->comp_list);
 407         spin_unlock_irqrestore(&file->lock, flags);
 408
 409         wake_up_interruptible(&file->poll_wait);
 410         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 411 }
 412
 413 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 414                                     __u64 element, __u64 event,
 415                                     struct list_head *obj_list,
 416                                     u32 *counter)
 417 {
 418         struct ib_uverbs_event *entry;
 419         unsigned long flags;
 420
 421         spin_lock_irqsave(&file->async_file->lock, flags);
 422         if (file->async_file->is_closed) {
 423                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 424                 return;
 425         }
 426
 427         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 428         if (!entry) {
 429                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 430                 return;
 431         }
 432
 433         entry->desc.async.element    = element;
 434         entry->desc.async.event_type = event;
 435         entry->counter               = counter;
 436
 437         list_add_tail(&entry->list, &file->async_file->event_list);
 438         if (obj_list)
 439                 list_add_tail(&entry->obj_list, obj_list);
 440         spin_unlock_irqrestore(&file->async_file->lock, flags);
 441
 442         wake_up_interruptible(&file->async_file->poll_wait);
 443         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 444 }
 445
 446 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 447 {
 448         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 449                                                   struct ib_ucq_object, uobject);
 450
 451         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 452                                 event->event, &uobj->async_list,
 453                                 &uobj->async_events_reported);
 454 }
 455
 456 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 457 {
 458         struct ib_uevent_object *uobj;
 459
 460         uobj = container_of(event->element.qp->uobject,
 461                             struct ib_uevent_object, uobject);
 462
 463         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 464                                 event->event, &uobj->event_list,
 465                                 &uobj->events_reported);
 466 }
 467
 468 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 469 {
 470         struct ib_uevent_object *uobj;
 471
 472         uobj = container_of(event->element.srq->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_event_handler(struct ib_event_handler *handler,
 481                              struct ib_event *event)
 482 {
 483         struct ib_uverbs_file *file =
 484                 container_of(handler, struct ib_uverbs_file, event_handler);
 485
 486         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 487                                 NULL, NULL);
 488 }
 489
 490 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 491                                         int is_async, int *fd)
 492 {
 493         struct ib_uverbs_event_file *ev_file;
 494         struct path path;
 495         struct file *filp;
 496         int ret;
 497
 498         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 499         if (!ev_file)
 500                 return ERR_PTR(-ENOMEM);
 501
 502         kref_init(&ev_file->ref);
 503         spin_lock_init(&ev_file->lock);
 504         INIT_LIST_HEAD(&ev_file->event_list);
 505         init_waitqueue_head(&ev_file->poll_wait);
 506         ev_file->uverbs_file = uverbs_file;
 507         ev_file->async_queue = NULL;
 508         ev_file->is_async    = is_async;
 509         ev_file->is_closed   = 0;
 510
 511         *fd = get_unused_fd();
 512         if (*fd < 0) {
 513                 ret = *fd;
 514                 goto err;
 515         }
 516
 517         /*
 518          * fops_get() can't fail here, because we're coming from a
 519          * system call on a uverbs file, which will already have a
 520          * module reference.
 521          */
 522         path.mnt = uverbs_event_mnt;
 523         path.dentry = uverbs_event_mnt->mnt_root;
 524         path_get(&path);
 525         filp = alloc_file(&path, FMODE_READ, fops_get(&uverbs_event_fops));
 526         if (!filp) {
 527                 ret = -ENFILE;
 528                 goto err_fd;
 529         }
 530
 531         filp->private_data = ev_file;
 532
 533         return filp;
 534
 535 err_fd:
 536         fops_put(&uverbs_event_fops);
 537         path_put(&path);
 538         put_unused_fd(*fd);
 539
 540 err:
 541         kfree(ev_file);
 542         return ERR_PTR(ret);
 543 }
 544
 545 /*
 546  * Look up a completion event file by FD.  If lookup is successful,
 547  * takes a ref to the event file struct that it returns; if
 548  * unsuccessful, returns NULL.
 549  */
 550 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 551 {
 552         struct ib_uverbs_event_file *ev_file = NULL;
 553         struct file *filp;
 554
 555         filp = fget(fd);
 556         if (!filp)
 557                 return NULL;
 558
 559         if (filp->f_op != &uverbs_event_fops)
 560                 goto out;
 561
 562         ev_file = filp->private_data;
 563         if (ev_file->is_async) {
 564                 ev_file = NULL;
 565                 goto out;
 566         }
 567
 568         kref_get(&ev_file->ref);
 569
 570 out:
 571         fput(filp);
 572         return ev_file;
 573 }
 574
 575 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 576                              size_t count, loff_t *pos)
 577 {
 578         struct ib_uverbs_file *file = filp->private_data;
 579         struct ib_uverbs_cmd_hdr hdr;
 580
 581         if (count < sizeof hdr)
 582                 return -EINVAL;
 583
 584         if (copy_from_user(&hdr, buf, sizeof hdr))
 585                 return -EFAULT;
 586
 587         if (hdr.in_words * 4 != count)
 588                 return -EINVAL;
 589
 590         if (hdr.command < 0                             ||
 591             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 592             !uverbs_cmd_table[hdr.command])
 593                 return -EINVAL;
 594
 595         if (!file->ucontext &&
 596             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 597                 return -EINVAL;
 598
 599         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 600                 return -ENOSYS;
 601
 602         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 603                                              hdr.in_words * 4, hdr.out_words * 4);
 604 }
 605
 606 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 607 {
 608         struct ib_uverbs_file *file = filp->private_data;
 609
 610         if (!file->ucontext)
 611                 return -ENODEV;
 612         else
 613                 return file->device->ib_dev->mmap(file->ucontext, vma);
 614 }
 615
 616 /*
 617  * ib_uverbs_open() does not need the BKL:
 618  *
 619  *  - dev_table[] accesses are protected by map_lock, the
 620  *    ib_uverbs_device structures are properly reference counted, and
 621  *    everything else is purely local to the file being created, so
 622  *    races against other open calls are not a problem;
 623  *  - there is no ioctl method to race against;
 624  *  - the device is added to dev_table[] as the last part of module
 625  *    initialization, the open method will either immediately run
 626  *    -ENXIO, or all required initialization will be done.
 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         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 const 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 const 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 device *device, struct device_attribute *attr,
 708                           char *buf)
 709 {
 710         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 711
 712         if (!dev)
 713                 return -ENODEV;
 714
 715         return sprintf(buf, "%s\n", dev->ib_dev->name);
 716 }
 717 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 718
 719 static ssize_t show_dev_abi_version(struct device *device,
 720                                     struct device_attribute *attr, char *buf)
 721 {
 722         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 723
 724         if (!dev)
 725                 return -ENODEV;
 726
 727         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 728 }
 729 static 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         init_completion(&uverbs_dev->comp);
 750
 751         spin_lock(&map_lock);
 752         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 753         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 754                 spin_unlock(&map_lock);
 755                 goto err;
 756         }
 757         set_bit(uverbs_dev->devnum, dev_map);
 758         spin_unlock(&map_lock);
 759
 760         uverbs_dev->ib_dev           = device;
 761         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 762
 763         cdev_init(&uverbs_dev->cdev, NULL);
 764         uverbs_dev->cdev.owner = THIS_MODULE;
 765         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 766         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 767         if (cdev_add(&uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 768                 goto err_cdev;
 769
 770         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 771                                         uverbs_dev->cdev.dev, uverbs_dev,
 772                                         "uverbs%d", uverbs_dev->devnum);
 773         if (IS_ERR(uverbs_dev->dev))
 774                 goto err_cdev;
 775
 776         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 777                 goto err_class;
 778         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 779                 goto err_class;
 780
 781         spin_lock(&map_lock);
 782         dev_table[uverbs_dev->devnum] = uverbs_dev;
 783         spin_unlock(&map_lock);
 784
 785         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 786
 787         return;
 788
 789 err_class:
 790         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 791
 792 err_cdev:
 793         cdev_del(&uverbs_dev->cdev);
 794         clear_bit(uverbs_dev->devnum, dev_map);
 795
 796 err:
 797         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 798         wait_for_completion(&uverbs_dev->comp);
 799         kfree(uverbs_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         dev_set_drvdata(uverbs_dev->dev, NULL);
 811         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 812         cdev_del(&uverbs_dev->cdev);
 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
 820         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 821         wait_for_completion(&uverbs_dev->comp);
 822         kfree(uverbs_dev);
 823 }
 824
 825 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 826                                const char *dev_name, void *data,
 827                                struct vfsmount *mnt)
 828 {
 829         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 830                              INFINIBANDEVENTFS_MAGIC, mnt);
 831 }
 832
 833 static struct file_system_type uverbs_event_fs = {
 834         /* No owner field so module can be unloaded */
 835         .name    = "infinibandeventfs",
 836         .get_sb  = uverbs_event_get_sb,
 837         .kill_sb = kill_litter_super
 838 };
 839
 840 static int __init ib_uverbs_init(void)
 841 {
 842         int ret;
 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         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);