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