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 DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  78
  79 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  80                                      const char __user *buf, int in_len,
  81                                      int out_len) = {
  82         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  83         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  84         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  85         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  86         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  87         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  88         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  89         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  90         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  91         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  92         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  93         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  94         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  95         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  96         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
  97         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  98         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
  99         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 100         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 101         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 102         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 103         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 104         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 105         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 106         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 107         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 108         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 109         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 110 };
 111
 112 static struct vfsmount *uverbs_event_mnt;
 113
 114 static void ib_uverbs_add_one(struct ib_device *device);
 115 static void ib_uverbs_remove_one(struct ib_device *device);
 116
 117 static void ib_uverbs_release_dev(struct kref *ref)
 118 {
 119         struct ib_uverbs_device *dev =
 120                 container_of(ref, struct ib_uverbs_device, ref);
 121
 122         complete(&dev->comp);
 123 }
 124
 125 static void ib_uverbs_release_event_file(struct kref *ref)
 126 {
 127         struct ib_uverbs_event_file *file =
 128                 container_of(ref, struct ib_uverbs_event_file, ref);
 129
 130         kfree(file);
 131 }
 132
 133 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 134                           struct ib_uverbs_event_file *ev_file,
 135                           struct ib_ucq_object *uobj)
 136 {
 137         struct ib_uverbs_event *evt, *tmp;
 138
 139         if (ev_file) {
 140                 spin_lock_irq(&ev_file->lock);
 141                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 142                         list_del(&evt->list);
 143                         kfree(evt);
 144                 }
 145                 spin_unlock_irq(&ev_file->lock);
 146
 147                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 148         }
 149
 150         spin_lock_irq(&file->async_file->lock);
 151         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 152                 list_del(&evt->list);
 153                 kfree(evt);
 154         }
 155         spin_unlock_irq(&file->async_file->lock);
 156 }
 157
 158 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 159                               struct ib_uevent_object *uobj)
 160 {
 161         struct ib_uverbs_event *evt, *tmp;
 162
 163         spin_lock_irq(&file->async_file->lock);
 164         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 165                 list_del(&evt->list);
 166                 kfree(evt);
 167         }
 168         spin_unlock_irq(&file->async_file->lock);
 169 }
 170
 171 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 172                                     struct ib_uqp_object *uobj)
 173 {
 174         struct ib_uverbs_mcast_entry *mcast, *tmp;
 175
 176         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 177                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 178                 list_del(&mcast->list);
 179                 kfree(mcast);
 180         }
 181 }
 182
 183 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 184                                       struct ib_ucontext *context)
 185 {
 186         struct ib_uobject *uobj, *tmp;
 187
 188         if (!context)
 189                 return 0;
 190
 191         context->closing = 1;
 192
 193         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 194                 struct ib_ah *ah = uobj->object;
 195
 196                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 197                 ib_destroy_ah(ah);
 198                 kfree(uobj);
 199         }
 200
 201         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 202                 struct ib_qp *qp = uobj->object;
 203                 struct ib_uqp_object *uqp =
 204                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 205
 206                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 207                 ib_uverbs_detach_umcast(qp, uqp);
 208                 ib_destroy_qp(qp);
 209                 ib_uverbs_release_uevent(file, &uqp->uevent);
 210                 kfree(uqp);
 211         }
 212
 213         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 214                 struct ib_cq *cq = uobj->object;
 215                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 216                 struct ib_ucq_object *ucq =
 217                         container_of(uobj, struct ib_ucq_object, uobject);
 218
 219                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 220                 ib_destroy_cq(cq);
 221                 ib_uverbs_release_ucq(file, ev_file, ucq);
 222                 kfree(ucq);
 223         }
 224
 225         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 226                 struct ib_srq *srq = uobj->object;
 227                 struct ib_uevent_object *uevent =
 228                         container_of(uobj, struct ib_uevent_object, uobject);
 229
 230                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 231                 ib_destroy_srq(srq);
 232                 ib_uverbs_release_uevent(file, uevent);
 233                 kfree(uevent);
 234         }
 235
 236         /* XXX Free MWs */
 237
 238         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 239                 struct ib_mr *mr = uobj->object;
 240
 241                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 242                 ib_dereg_mr(mr);
 243                 kfree(uobj);
 244         }
 245
 246         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 247                 struct ib_pd *pd = uobj->object;
 248
 249                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 250                 ib_dealloc_pd(pd);
 251                 kfree(uobj);
 252         }
 253
 254         return context->device->dealloc_ucontext(context);
 255 }
 256
 257 static void ib_uverbs_release_file(struct kref *ref)
 258 {
 259         struct ib_uverbs_file *file =
 260                 container_of(ref, struct ib_uverbs_file, ref);
 261
 262         module_put(file->device->ib_dev->owner);
 263         kref_put(&file->device->ref, ib_uverbs_release_dev);
 264
 265         kfree(file);
 266 }
 267
 268 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 269                                     size_t count, loff_t *pos)
 270 {
 271         struct ib_uverbs_event_file *file = filp->private_data;
 272         struct ib_uverbs_event *event;
 273         int eventsz;
 274         int ret = 0;
 275
 276         spin_lock_irq(&file->lock);
 277
 278         while (list_empty(&file->event_list)) {
 279                 spin_unlock_irq(&file->lock);
 280
 281                 if (filp->f_flags & O_NONBLOCK)
 282                         return -EAGAIN;
 283
 284                 if (wait_event_interruptible(file->poll_wait,
 285                                              !list_empty(&file->event_list)))
 286                         return -ERESTARTSYS;
 287
 288                 spin_lock_irq(&file->lock);
 289         }
 290
 291         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 292
 293         if (file->is_async)
 294                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 295         else
 296                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 297
 298         if (eventsz > count) {
 299                 ret   = -EINVAL;
 300                 event = NULL;
 301         } else {
 302                 list_del(file->event_list.next);
 303                 if (event->counter) {
 304                         ++(*event->counter);
 305                         list_del(&event->obj_list);
 306                 }
 307         }
 308
 309         spin_unlock_irq(&file->lock);
 310
 311         if (event) {
 312                 if (copy_to_user(buf, event, eventsz))
 313                         ret = -EFAULT;
 314                 else
 315                         ret = eventsz;
 316         }
 317
 318         kfree(event);
 319
 320         return ret;
 321 }
 322
 323 static unsigned int ib_uverbs_event_poll(struct file *filp,
 324                                          struct poll_table_struct *wait)
 325 {
 326         unsigned int pollflags = 0;
 327         struct ib_uverbs_event_file *file = filp->private_data;
 328
 329         poll_wait(filp, &file->poll_wait, wait);
 330
 331         spin_lock_irq(&file->lock);
 332         if (!list_empty(&file->event_list))
 333                 pollflags = POLLIN | POLLRDNORM;
 334         spin_unlock_irq(&file->lock);
 335
 336         return pollflags;
 337 }
 338
 339 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 340 {
 341         struct ib_uverbs_event_file *file = filp->private_data;
 342
 343         return fasync_helper(fd, filp, on, &file->async_queue);
 344 }
 345
 346 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 347 {
 348         struct ib_uverbs_event_file *file = filp->private_data;
 349         struct ib_uverbs_event *entry, *tmp;
 350
 351         spin_lock_irq(&file->lock);
 352         file->is_closed = 1;
 353         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 354                 if (entry->counter)
 355                         list_del(&entry->obj_list);
 356                 kfree(entry);
 357         }
 358         spin_unlock_irq(&file->lock);
 359
 360         if (file->is_async) {
 361                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 362                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 363         }
 364         kref_put(&file->ref, ib_uverbs_release_event_file);
 365
 366         return 0;
 367 }
 368
 369 static const struct file_operations uverbs_event_fops = {
 370         .owner   = THIS_MODULE,
 371         .read    = ib_uverbs_event_read,
 372         .poll    = ib_uverbs_event_poll,
 373         .release = ib_uverbs_event_close,
 374         .fasync  = ib_uverbs_event_fasync
 375 };
 376
 377 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 378 {
 379         struct ib_uverbs_event_file    *file = cq_context;
 380         struct ib_ucq_object           *uobj;
 381         struct ib_uverbs_event         *entry;
 382         unsigned long                   flags;
 383
 384         if (!file)
 385                 return;
 386
 387         spin_lock_irqsave(&file->lock, flags);
 388         if (file->is_closed) {
 389                 spin_unlock_irqrestore(&file->lock, flags);
 390                 return;
 391         }
 392
 393         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 394         if (!entry) {
 395                 spin_unlock_irqrestore(&file->lock, flags);
 396                 return;
 397         }
 398
 399         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 400
 401         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 402         entry->counter             = &uobj->comp_events_reported;
 403
 404         list_add_tail(&entry->list, &file->event_list);
 405         list_add_tail(&entry->obj_list, &uobj->comp_list);
 406         spin_unlock_irqrestore(&file->lock, flags);
 407
 408         wake_up_interruptible(&file->poll_wait);
 409         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 410 }
 411
 412 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 413                                     __u64 element, __u64 event,
 414                                     struct list_head *obj_list,
 415                                     u32 *counter)
 416 {
 417         struct ib_uverbs_event *entry;
 418         unsigned long flags;
 419
 420         spin_lock_irqsave(&file->async_file->lock, flags);
 421         if (file->async_file->is_closed) {
 422                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 423                 return;
 424         }
 425
 426         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 427         if (!entry) {
 428                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 429                 return;
 430         }
 431
 432         entry->desc.async.element    = element;
 433         entry->desc.async.event_type = event;
 434         entry->counter               = counter;
 435
 436         list_add_tail(&entry->list, &file->async_file->event_list);
 437         if (obj_list)
 438                 list_add_tail(&entry->obj_list, obj_list);
 439         spin_unlock_irqrestore(&file->async_file->lock, flags);
 440
 441         wake_up_interruptible(&file->async_file->poll_wait);
 442         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 443 }
 444
 445 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 446 {
 447         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 448                                                   struct ib_ucq_object, uobject);
 449
 450         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 451                                 event->event, &uobj->async_list,
 452                                 &uobj->async_events_reported);
 453 }
 454
 455 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 456 {
 457         struct ib_uevent_object *uobj;
 458
 459         uobj = container_of(event->element.qp->uobject,
 460                             struct ib_uevent_object, uobject);
 461
 462         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 463                                 event->event, &uobj->event_list,
 464                                 &uobj->events_reported);
 465 }
 466
 467 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 468 {
 469         struct ib_uevent_object *uobj;
 470
 471         uobj = container_of(event->element.srq->uobject,
 472                             struct ib_uevent_object, uobject);
 473
 474         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 475                                 event->event, &uobj->event_list,
 476                                 &uobj->events_reported);
 477 }
 478
 479 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 480                              struct ib_event *event)
 481 {
 482         struct ib_uverbs_file *file =
 483                 container_of(handler, struct ib_uverbs_file, event_handler);
 484
 485         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 486                                 NULL, NULL);
 487 }
 488
 489 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 490                                         int is_async, int *fd)
 491 {
 492         struct ib_uverbs_event_file *ev_file;
 493         struct path path;
 494         struct file *filp;
 495         int ret;
 496
 497         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 498         if (!ev_file)
 499                 return ERR_PTR(-ENOMEM);
 500
 501         kref_init(&ev_file->ref);
 502         spin_lock_init(&ev_file->lock);
 503         INIT_LIST_HEAD(&ev_file->event_list);
 504         init_waitqueue_head(&ev_file->poll_wait);
 505         ev_file->uverbs_file = uverbs_file;
 506         ev_file->async_queue = NULL;
 507         ev_file->is_async    = is_async;
 508         ev_file->is_closed   = 0;
 509
 510         *fd = get_unused_fd();
 511         if (*fd < 0) {
 512                 ret = *fd;
 513                 goto err;
 514         }
 515
 516         /*
 517          * fops_get() can't fail here, because we're coming from a
 518          * system call on a uverbs file, which will already have a
 519          * module reference.
 520          */
 521         path.mnt = uverbs_event_mnt;
 522         path.dentry = uverbs_event_mnt->mnt_root;
 523         path_get(&path);
 524         filp = alloc_file(&path, FMODE_READ, fops_get(&uverbs_event_fops));
 525         if (!filp) {
 526                 ret = -ENFILE;
 527                 goto err_fd;
 528         }
 529
 530         filp->private_data = ev_file;
 531
 532         return filp;
 533
 534 err_fd:
 535         fops_put(&uverbs_event_fops);
 536         path_put(&path);
 537         put_unused_fd(*fd);
 538
 539 err:
 540         kfree(ev_file);
 541         return ERR_PTR(ret);
 542 }
 543
 544 /*
 545  * Look up a completion event file by FD.  If lookup is successful,
 546  * takes a ref to the event file struct that it returns; if
 547  * unsuccessful, returns NULL.
 548  */
 549 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 550 {
 551         struct ib_uverbs_event_file *ev_file = NULL;
 552         struct file *filp;
 553
 554         filp = fget(fd);
 555         if (!filp)
 556                 return NULL;
 557
 558         if (filp->f_op != &uverbs_event_fops)
 559                 goto out;
 560
 561         ev_file = filp->private_data;
 562         if (ev_file->is_async) {
 563                 ev_file = NULL;
 564                 goto out;
 565         }
 566
 567         kref_get(&ev_file->ref);
 568
 569 out:
 570         fput(filp);
 571         return ev_file;
 572 }
 573
 574 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 575                              size_t count, loff_t *pos)
 576 {
 577         struct ib_uverbs_file *file = filp->private_data;
 578         struct ib_uverbs_cmd_hdr hdr;
 579
 580         if (count < sizeof hdr)
 581                 return -EINVAL;
 582
 583         if (copy_from_user(&hdr, buf, sizeof hdr))
 584                 return -EFAULT;
 585
 586         if (hdr.in_words * 4 != count)
 587                 return -EINVAL;
 588
 589         if (hdr.command < 0                             ||
 590             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 591             !uverbs_cmd_table[hdr.command])
 592                 return -EINVAL;
 593
 594         if (!file->ucontext &&
 595             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 596                 return -EINVAL;
 597
 598         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 599                 return -ENOSYS;
 600
 601         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 602                                              hdr.in_words * 4, hdr.out_words * 4);
 603 }
 604
 605 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 606 {
 607         struct ib_uverbs_file *file = filp->private_data;
 608
 609         if (!file->ucontext)
 610                 return -ENODEV;
 611         else
 612                 return file->device->ib_dev->mmap(file->ucontext, vma);
 613 }
 614
 615 /*
 616  * ib_uverbs_open() does not need the BKL:
 617  *
 618  *  - the ib_uverbs_device structures are properly reference counted and
 619  *    everything else is purely local to the file being created, so
 620  *    races against other open calls are not a problem;
 621  *  - there is no ioctl method to race against;
 622  *  - the open method will either immediately run -ENXIO, or all
 623  *    required initialization will be done.
 624  */
 625 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 626 {
 627         struct ib_uverbs_device *dev;
 628         struct ib_uverbs_file *file;
 629         int ret;
 630
 631         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 632         if (dev)
 633                 kref_get(&dev->ref);
 634         else
 635                 return -ENXIO;
 636
 637         if (!try_module_get(dev->ib_dev->owner)) {
 638                 ret = -ENODEV;
 639                 goto err;
 640         }
 641
 642         file = kmalloc(sizeof *file, GFP_KERNEL);
 643         if (!file) {
 644                 ret = -ENOMEM;
 645                 goto err_module;
 646         }
 647
 648         file->device     = dev;
 649         file->ucontext   = NULL;
 650         file->async_file = NULL;
 651         kref_init(&file->ref);
 652         mutex_init(&file->mutex);
 653
 654         filp->private_data = file;
 655
 656         return 0;
 657
 658 err_module:
 659         module_put(dev->ib_dev->owner);
 660
 661 err:
 662         kref_put(&dev->ref, ib_uverbs_release_dev);
 663         return ret;
 664 }
 665
 666 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 667 {
 668         struct ib_uverbs_file *file = filp->private_data;
 669
 670         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 671
 672         if (file->async_file)
 673                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 674
 675         kref_put(&file->ref, ib_uverbs_release_file);
 676
 677         return 0;
 678 }
 679
 680 static const struct file_operations uverbs_fops = {
 681         .owner   = THIS_MODULE,
 682         .write   = ib_uverbs_write,
 683         .open    = ib_uverbs_open,
 684         .release = ib_uverbs_close
 685 };
 686
 687 static const struct file_operations uverbs_mmap_fops = {
 688         .owner   = THIS_MODULE,
 689         .write   = ib_uverbs_write,
 690         .mmap    = ib_uverbs_mmap,
 691         .open    = ib_uverbs_open,
 692         .release = ib_uverbs_close
 693 };
 694
 695 static struct ib_client uverbs_client = {
 696         .name   = "uverbs",
 697         .add    = ib_uverbs_add_one,
 698         .remove = ib_uverbs_remove_one
 699 };
 700
 701 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 702                           char *buf)
 703 {
 704         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 705
 706         if (!dev)
 707                 return -ENODEV;
 708
 709         return sprintf(buf, "%s\n", dev->ib_dev->name);
 710 }
 711 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 712
 713 static ssize_t show_dev_abi_version(struct device *device,
 714                                     struct device_attribute *attr, char *buf)
 715 {
 716         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 717
 718         if (!dev)
 719                 return -ENODEV;
 720
 721         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 722 }
 723 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 724
 725 static ssize_t show_abi_version(struct class *class, char *buf)
 726 {
 727         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 728 }
 729 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 730
 731 static dev_t overflow_maj;
 732 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
 733
 734 /*
 735  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
 736  * requesting a new major number and doubling the number of max devices we
 737  * support. It's stupid, but simple.
 738  */
 739 static int find_overflow_devnum(void)
 740 {
 741         int ret;
 742
 743         if (!overflow_maj) {
 744                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
 745                                           "infiniband_verbs");
 746                 if (ret) {
 747                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
 748                         return ret;
 749                 }
 750         }
 751
 752         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
 753         if (ret >= IB_UVERBS_MAX_DEVICES)
 754                 return -1;
 755
 756         return ret;
 757 }
 758
 759 static void ib_uverbs_add_one(struct ib_device *device)
 760 {
 761         int devnum;
 762         dev_t base;
 763         struct ib_uverbs_device *uverbs_dev;
 764
 765         if (!device->alloc_ucontext)
 766                 return;
 767
 768         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 769         if (!uverbs_dev)
 770                 return;
 771
 772         kref_init(&uverbs_dev->ref);
 773         init_completion(&uverbs_dev->comp);
 774
 775         spin_lock(&map_lock);
 776         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 777         if (devnum >= IB_UVERBS_MAX_DEVICES) {
 778                 spin_unlock(&map_lock);
 779                 devnum = find_overflow_devnum();
 780                 if (devnum < 0)
 781                         goto err;
 782
 783                 spin_lock(&map_lock);
 784                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
 785                 base = devnum + overflow_maj;
 786                 set_bit(devnum, overflow_map);
 787         } else {
 788                 uverbs_dev->devnum = devnum;
 789                 base = devnum + IB_UVERBS_BASE_DEV;
 790                 set_bit(devnum, dev_map);
 791         }
 792         spin_unlock(&map_lock);
 793
 794         uverbs_dev->ib_dev           = device;
 795         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 796
 797         cdev_init(&uverbs_dev->cdev, NULL);
 798         uverbs_dev->cdev.owner = THIS_MODULE;
 799         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 800         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 801         if (cdev_add(&uverbs_dev->cdev, base, 1))
 802                 goto err_cdev;
 803
 804         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 805                                         uverbs_dev->cdev.dev, uverbs_dev,
 806                                         "uverbs%d", uverbs_dev->devnum);
 807         if (IS_ERR(uverbs_dev->dev))
 808                 goto err_cdev;
 809
 810         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 811                 goto err_class;
 812         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 813                 goto err_class;
 814
 815         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 816
 817         return;
 818
 819 err_class:
 820         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 821
 822 err_cdev:
 823         cdev_del(&uverbs_dev->cdev);
 824         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 825                 clear_bit(devnum, dev_map);
 826         else
 827                 clear_bit(devnum, overflow_map);
 828
 829 err:
 830         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 831         wait_for_completion(&uverbs_dev->comp);
 832         kfree(uverbs_dev);
 833         return;
 834 }
 835
 836 static void ib_uverbs_remove_one(struct ib_device *device)
 837 {
 838         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 839
 840         if (!uverbs_dev)
 841                 return;
 842
 843         dev_set_drvdata(uverbs_dev->dev, NULL);
 844         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 845         cdev_del(&uverbs_dev->cdev);
 846
 847         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 848                 clear_bit(uverbs_dev->devnum, dev_map);
 849         else
 850                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
 851
 852         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 853         wait_for_completion(&uverbs_dev->comp);
 854         kfree(uverbs_dev);
 855 }
 856
 857 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 858                                const char *dev_name, void *data,
 859                                struct vfsmount *mnt)
 860 {
 861         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 862                              INFINIBANDEVENTFS_MAGIC, mnt);
 863 }
 864
 865 static struct file_system_type uverbs_event_fs = {
 866         /* No owner field so module can be unloaded */
 867         .name    = "infinibandeventfs",
 868         .get_sb  = uverbs_event_get_sb,
 869         .kill_sb = kill_litter_super
 870 };
 871
 872 static int __init ib_uverbs_init(void)
 873 {
 874         int ret;
 875
 876         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 877                                      "infiniband_verbs");
 878         if (ret) {
 879                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 880                 goto out;
 881         }
 882
 883         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 884         if (IS_ERR(uverbs_class)) {
 885                 ret = PTR_ERR(uverbs_class);
 886                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 887                 goto out_chrdev;
 888         }
 889
 890         ret = class_create_file(uverbs_class, &class_attr_abi_version);
 891         if (ret) {
 892                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 893                 goto out_class;
 894         }
 895
 896         ret = register_filesystem(&uverbs_event_fs);
 897         if (ret) {
 898                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 899                 goto out_class;
 900         }
 901
 902         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 903         if (IS_ERR(uverbs_event_mnt)) {
 904                 ret = PTR_ERR(uverbs_event_mnt);
 905                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 906                 goto out_fs;
 907         }
 908
 909         ret = ib_register_client(&uverbs_client);
 910         if (ret) {
 911                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 912                 goto out_mnt;
 913         }
 914
 915         return 0;
 916
 917 out_mnt:
 918         mntput(uverbs_event_mnt);
 919
 920 out_fs:
 921         unregister_filesystem(&uverbs_event_fs);
 922
 923 out_class:
 924         class_destroy(uverbs_class);
 925
 926 out_chrdev:
 927         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 928
 929 out:
 930         return ret;
 931 }
 932
 933 static void __exit ib_uverbs_cleanup(void)
 934 {
 935         ib_unregister_client(&uverbs_client);
 936         mntput(uverbs_event_mnt);
 937         unregister_filesystem(&uverbs_event_fs);
 938         class_destroy(uverbs_class);
 939         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 940         if (overflow_maj)
 941                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
 942         idr_destroy(&ib_uverbs_pd_idr);
 943         idr_destroy(&ib_uverbs_mr_idr);
 944         idr_destroy(&ib_uverbs_mw_idr);
 945         idr_destroy(&ib_uverbs_ah_idr);
 946         idr_destroy(&ib_uverbs_cq_idr);
 947         idr_destroy(&ib_uverbs_qp_idr);
 948         idr_destroy(&ib_uverbs_srq_idr);
 949 }
 950
 951 module_init(ib_uverbs_init);
 952 module_exit(ib_uverbs_cleanup);