drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  *
   7  * This software is available to you under a choice of one of two
   8  * licenses.  You may choose to be licensed under the terms of the GNU
   9  * General Public License (GPL) Version 2, available from the file
  10  * COPYING in the main directory of this source tree, or the
  11  * OpenIB.org BSD license below:
  12  *
  13  *     Redistribution and use in source and binary forms, with or
  14  *     without modification, are permitted provided that the following
  15  *     conditions are met:
  16  *
  17  *      - Redistributions of source code must retain the above
  18  *        copyright notice, this list of conditions and the following
  19  *        disclaimer.
  20  *
  21  *      - Redistributions in binary form must reproduce the above
  22  *        copyright notice, this list of conditions and the following
  23  *        disclaimer in the documentation and/or other materials
  24  *        provided with the distribution.
  25  *
  26  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  27  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  28  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  29  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  30  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  31  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  32  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  33  * SOFTWARE.
  34  *
  35  * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $
  36  */
  37
  38 #include <linux/module.h>
  39 #include <linux/init.h>
  40 #include <linux/device.h>
  41 #include <linux/err.h>
  42 #include <linux/fs.h>
  43 #include <linux/poll.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 DECLARE_MUTEX(ib_uverbs_idr_mutex);
  66 DEFINE_IDR(ib_uverbs_pd_idr);
  67 DEFINE_IDR(ib_uverbs_mr_idr);
  68 DEFINE_IDR(ib_uverbs_mw_idr);
  69 DEFINE_IDR(ib_uverbs_ah_idr);
  70 DEFINE_IDR(ib_uverbs_cq_idr);
  71 DEFINE_IDR(ib_uverbs_qp_idr);
  72 DEFINE_IDR(ib_uverbs_srq_idr);
  73
  74 static spinlock_t map_lock;
  75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  76
  77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  78                                      const char __user *buf, int in_len,
  79                                      int out_len) = {
  80         [IB_USER_VERBS_CMD_QUERY_PARAMS]  = ib_uverbs_query_params,
  81         [IB_USER_VERBS_CMD_GET_CONTEXT]   = ib_uverbs_get_context,
  82         [IB_USER_VERBS_CMD_QUERY_DEVICE]  = ib_uverbs_query_device,
  83         [IB_USER_VERBS_CMD_QUERY_PORT]    = ib_uverbs_query_port,
  84         [IB_USER_VERBS_CMD_QUERY_GID]     = ib_uverbs_query_gid,
  85         [IB_USER_VERBS_CMD_QUERY_PKEY]    = ib_uverbs_query_pkey,
  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_CQ]     = ib_uverbs_create_cq,
  91         [IB_USER_VERBS_CMD_DESTROY_CQ]    = ib_uverbs_destroy_cq,
  92         [IB_USER_VERBS_CMD_CREATE_QP]     = ib_uverbs_create_qp,
  93         [IB_USER_VERBS_CMD_MODIFY_QP]     = ib_uverbs_modify_qp,
  94         [IB_USER_VERBS_CMD_DESTROY_QP]    = ib_uverbs_destroy_qp,
  95         [IB_USER_VERBS_CMD_ATTACH_MCAST]  = ib_uverbs_attach_mcast,
  96         [IB_USER_VERBS_CMD_DETACH_MCAST]  = ib_uverbs_detach_mcast,
  97         [IB_USER_VERBS_CMD_CREATE_SRQ]    = ib_uverbs_create_srq,
  98         [IB_USER_VERBS_CMD_MODIFY_SRQ]    = ib_uverbs_modify_srq,
  99         [IB_USER_VERBS_CMD_DESTROY_SRQ]   = ib_uverbs_destroy_srq,
 100 };
 101
 102 static struct vfsmount *uverbs_event_mnt;
 103
 104 static void ib_uverbs_add_one(struct ib_device *device);
 105 static void ib_uverbs_remove_one(struct ib_device *device);
 106
 107 static int ib_dealloc_ucontext(struct ib_ucontext *context)
 108 {
 109         struct ib_uobject *uobj, *tmp;
 110
 111         if (!context)
 112                 return 0;
 113
 114         down(&ib_uverbs_idr_mutex);
 115
 116         /* XXX Free AHs */
 117
 118         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 119                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 120                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 121                 ib_destroy_qp(qp);
 122                 list_del(&uobj->list);
 123                 kfree(container_of(uobj, struct ib_uevent_object, uobject));
 124         }
 125
 126         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 127                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 128                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 129                 ib_destroy_cq(cq);
 130                 list_del(&uobj->list);
 131                 kfree(container_of(uobj, struct ib_ucq_object, uobject));
 132         }
 133
 134         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 135                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
 136                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
 137                 ib_destroy_srq(srq);
 138                 list_del(&uobj->list);
 139                 kfree(container_of(uobj, struct ib_uevent_object, uobject));
 140         }
 141
 142         /* XXX Free MWs */
 143
 144         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 145                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 146                 struct ib_device *mrdev = mr->device;
 147                 struct ib_umem_object *memobj;
 148
 149                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 150                 ib_dereg_mr(mr);
 151
 152                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 153                 ib_umem_release_on_close(mrdev, &memobj->umem);
 154
 155                 list_del(&uobj->list);
 156                 kfree(memobj);
 157         }
 158
 159         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 160                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 161                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 162                 ib_dealloc_pd(pd);
 163                 list_del(&uobj->list);
 164                 kfree(uobj);
 165         }
 166
 167         up(&ib_uverbs_idr_mutex);
 168
 169         return context->device->dealloc_ucontext(context);
 170 }
 171
 172 static void ib_uverbs_release_file(struct kref *ref)
 173 {
 174         struct ib_uverbs_file *file =
 175                 container_of(ref, struct ib_uverbs_file, ref);
 176
 177         module_put(file->device->ib_dev->owner);
 178         kfree(file);
 179 }
 180
 181 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 182                                     size_t count, loff_t *pos)
 183 {
 184         struct ib_uverbs_event_file *file = filp->private_data;
 185         struct ib_uverbs_event *event;
 186         int eventsz;
 187         int ret = 0;
 188
 189         spin_lock_irq(&file->lock);
 190
 191         while (list_empty(&file->event_list) && file->fd >= 0) {
 192                 spin_unlock_irq(&file->lock);
 193
 194                 if (filp->f_flags & O_NONBLOCK)
 195                         return -EAGAIN;
 196
 197                 if (wait_event_interruptible(file->poll_wait,
 198                                              !list_empty(&file->event_list) ||
 199                                              file->fd < 0))
 200                         return -ERESTARTSYS;
 201
 202                 spin_lock_irq(&file->lock);
 203         }
 204
 205         if (file->fd < 0) {
 206                 spin_unlock_irq(&file->lock);
 207                 return -ENODEV;
 208         }
 209
 210         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 211
 212         if (file->is_async)
 213                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 214         else
 215                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 216
 217         if (eventsz > count) {
 218                 ret   = -EINVAL;
 219                 event = NULL;
 220         } else {
 221                 list_del(file->event_list.next);
 222                 if (event->counter) {
 223                         ++(*event->counter);
 224                         list_del(&event->obj_list);
 225                 }
 226         }
 227
 228         spin_unlock_irq(&file->lock);
 229
 230         if (event) {
 231                 if (copy_to_user(buf, event, eventsz))
 232                         ret = -EFAULT;
 233                 else
 234                         ret = eventsz;
 235         }
 236
 237         kfree(event);
 238
 239         return ret;
 240 }
 241
 242 static unsigned int ib_uverbs_event_poll(struct file *filp,
 243                                          struct poll_table_struct *wait)
 244 {
 245         unsigned int pollflags = 0;
 246         struct ib_uverbs_event_file *file = filp->private_data;
 247
 248         poll_wait(filp, &file->poll_wait, wait);
 249
 250         spin_lock_irq(&file->lock);
 251         if (file->fd < 0)
 252                 pollflags = POLLERR;
 253         else if (!list_empty(&file->event_list))
 254                 pollflags = POLLIN | POLLRDNORM;
 255         spin_unlock_irq(&file->lock);
 256
 257         return pollflags;
 258 }
 259
 260 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file)
 261 {
 262         struct ib_uverbs_event *entry, *tmp;
 263
 264         spin_lock_irq(&file->lock);
 265         if (file->fd != -1) {
 266                 file->fd = -1;
 267                 list_for_each_entry_safe(entry, tmp, &file->event_list, list)
 268                         kfree(entry);
 269         }
 270         spin_unlock_irq(&file->lock);
 271 }
 272
 273 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 274 {
 275         struct ib_uverbs_event_file *file = filp->private_data;
 276
 277         return fasync_helper(fd, filp, on, &file->async_queue);
 278 }
 279
 280 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 281 {
 282         struct ib_uverbs_event_file *file = filp->private_data;
 283
 284         ib_uverbs_event_release(file);
 285         ib_uverbs_event_fasync(-1, filp, 0);
 286         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 287
 288         return 0;
 289 }
 290
 291 static struct file_operations uverbs_event_fops = {
 292         /*
 293          * No .owner field since we artificially create event files,
 294          * so there is no increment to the module reference count in
 295          * the open path.  All event files come from a uverbs command
 296          * file, which already takes a module reference, so this is OK.
 297          */
 298         .read    = ib_uverbs_event_read,
 299         .poll    = ib_uverbs_event_poll,
 300         .release = ib_uverbs_event_close,
 301         .fasync  = ib_uverbs_event_fasync
 302 };
 303
 304 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 305 {
 306         struct ib_uverbs_file  *file = cq_context;
 307         struct ib_ucq_object   *uobj;
 308         struct ib_uverbs_event *entry;
 309         unsigned long           flags;
 310
 311         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 312         if (!entry)
 313                 return;
 314
 315         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 316
 317         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 318         entry->counter             = &uobj->comp_events_reported;
 319
 320         spin_lock_irqsave(&file->comp_file[0].lock, flags);
 321         list_add_tail(&entry->list, &file->comp_file[0].event_list);
 322         list_add_tail(&entry->obj_list, &uobj->comp_list);
 323         spin_unlock_irqrestore(&file->comp_file[0].lock, flags);
 324
 325         wake_up_interruptible(&file->comp_file[0].poll_wait);
 326         kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN);
 327 }
 328
 329 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 330                                     __u64 element, __u64 event,
 331                                     struct list_head *obj_list,
 332                                     u32 *counter)
 333 {
 334         struct ib_uverbs_event *entry;
 335         unsigned long flags;
 336
 337         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 338         if (!entry)
 339                 return;
 340
 341         entry->desc.async.element    = element;
 342         entry->desc.async.event_type = event;
 343         entry->counter               = counter;
 344
 345         spin_lock_irqsave(&file->async_file.lock, flags);
 346         list_add_tail(&entry->list, &file->async_file.event_list);
 347         if (obj_list)
 348                 list_add_tail(&entry->obj_list, obj_list);
 349         spin_unlock_irqrestore(&file->async_file.lock, flags);
 350
 351         wake_up_interruptible(&file->async_file.poll_wait);
 352         kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN);
 353 }
 354
 355 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 356 {
 357         struct ib_ucq_object *uobj;
 358
 359         uobj = container_of(event->element.cq->uobject,
 360                             struct ib_ucq_object, uobject);
 361
 362         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 363                                 event->event, &uobj->async_list,
 364                                 &uobj->async_events_reported);
 365
 366 }
 367
 368 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 369 {
 370         struct ib_uevent_object *uobj;
 371
 372         uobj = container_of(event->element.qp->uobject,
 373                             struct ib_uevent_object, uobject);
 374
 375         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 376                                 event->event, &uobj->event_list,
 377                                 &uobj->events_reported);
 378 }
 379
 380 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 381 {
 382         struct ib_uevent_object *uobj;
 383
 384         uobj = container_of(event->element.srq->uobject,
 385                             struct ib_uevent_object, uobject);
 386
 387         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 388                                 event->event, &uobj->event_list,
 389                                 &uobj->events_reported);
 390 }
 391
 392 static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 393                                     struct ib_event *event)
 394 {
 395         struct ib_uverbs_file *file =
 396                 container_of(handler, struct ib_uverbs_file, event_handler);
 397
 398         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 399                                 NULL, NULL);
 400 }
 401
 402 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file,
 403                                 struct ib_uverbs_file *uverbs_file)
 404 {
 405         struct file *filp;
 406
 407         spin_lock_init(&file->lock);
 408         INIT_LIST_HEAD(&file->event_list);
 409         init_waitqueue_head(&file->poll_wait);
 410         file->uverbs_file = uverbs_file;
 411         file->async_queue = NULL;
 412
 413         file->fd = get_unused_fd();
 414         if (file->fd < 0)
 415                 return file->fd;
 416
 417         filp = get_empty_filp();
 418         if (!filp) {
 419                 put_unused_fd(file->fd);
 420                 return -ENFILE;
 421         }
 422
 423         filp->f_op         = &uverbs_event_fops;
 424         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 425         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 426         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 427         filp->f_flags      = O_RDONLY;
 428         filp->f_mode       = FMODE_READ;
 429         filp->private_data = file;
 430
 431         fd_install(file->fd, filp);
 432
 433         return 0;
 434 }
 435
 436 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 437                              size_t count, loff_t *pos)
 438 {
 439         struct ib_uverbs_file *file = filp->private_data;
 440         struct ib_uverbs_cmd_hdr hdr;
 441
 442         if (count < sizeof hdr)
 443                 return -EINVAL;
 444
 445         if (copy_from_user(&hdr, buf, sizeof hdr))
 446                 return -EFAULT;
 447
 448         if (hdr.in_words * 4 != count)
 449                 return -EINVAL;
 450
 451         if (hdr.command < 0                             ||
 452             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 453             !uverbs_cmd_table[hdr.command])
 454                 return -EINVAL;
 455
 456         if (!file->ucontext                               &&
 457             hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS &&
 458             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 459                 return -EINVAL;
 460
 461         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 462                                              hdr.in_words * 4, hdr.out_words * 4);
 463 }
 464
 465 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 466 {
 467         struct ib_uverbs_file *file = filp->private_data;
 468
 469         if (!file->ucontext)
 470                 return -ENODEV;
 471         else
 472                 return file->device->ib_dev->mmap(file->ucontext, vma);
 473 }
 474
 475 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 476 {
 477         struct ib_uverbs_device *dev =
 478                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 479         struct ib_uverbs_file *file;
 480         int i = 0;
 481         int ret;
 482
 483         if (!try_module_get(dev->ib_dev->owner))
 484                 return -ENODEV;
 485
 486         file = kmalloc(sizeof *file +
 487                        (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file),
 488                        GFP_KERNEL);
 489         if (!file) {
 490                 ret = -ENOMEM;
 491                 goto err;
 492         }
 493
 494         file->device = dev;
 495         kref_init(&file->ref);
 496         init_MUTEX(&file->mutex);
 497
 498         file->ucontext = NULL;
 499
 500         kref_get(&file->ref);
 501         ret = ib_uverbs_event_init(&file->async_file, file);
 502         if (ret)
 503                 goto err_kref;
 504
 505         file->async_file.is_async = 1;
 506
 507         for (i = 0; i < dev->num_comp; ++i) {
 508                 kref_get(&file->ref);
 509                 ret = ib_uverbs_event_init(&file->comp_file[i], file);
 510                 if (ret)
 511                         goto err_async;
 512                 file->comp_file[i].is_async = 0;
 513         }
 514
 515
 516         filp->private_data = file;
 517
 518         INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev,
 519                               ib_uverbs_event_handler);
 520         if (ib_register_event_handler(&file->event_handler))
 521                 goto err_async;
 522
 523         return 0;
 524
 525 err_async:
 526         while (i--)
 527                 ib_uverbs_event_release(&file->comp_file[i]);
 528
 529         ib_uverbs_event_release(&file->async_file);
 530
 531 err_kref:
 532         /*
 533          * One extra kref_put() because we took a reference before the
 534          * event file creation that failed and got us here.
 535          */
 536         kref_put(&file->ref, ib_uverbs_release_file);
 537         kref_put(&file->ref, ib_uverbs_release_file);
 538
 539 err:
 540         module_put(dev->ib_dev->owner);
 541         return ret;
 542 }
 543
 544 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 545 {
 546         struct ib_uverbs_file *file = filp->private_data;
 547         int i;
 548
 549         ib_unregister_event_handler(&file->event_handler);
 550         ib_uverbs_event_release(&file->async_file);
 551         ib_dealloc_ucontext(file->ucontext);
 552
 553         for (i = 0; i < file->device->num_comp; ++i)
 554                 ib_uverbs_event_release(&file->comp_file[i]);
 555
 556         kref_put(&file->ref, ib_uverbs_release_file);
 557
 558         return 0;
 559 }
 560
 561 static struct file_operations uverbs_fops = {
 562         .owner   = THIS_MODULE,
 563         .write   = ib_uverbs_write,
 564         .open    = ib_uverbs_open,
 565         .release = ib_uverbs_close
 566 };
 567
 568 static struct file_operations uverbs_mmap_fops = {
 569         .owner   = THIS_MODULE,
 570         .write   = ib_uverbs_write,
 571         .mmap    = ib_uverbs_mmap,
 572         .open    = ib_uverbs_open,
 573         .release = ib_uverbs_close
 574 };
 575
 576 static struct ib_client uverbs_client = {
 577         .name   = "uverbs",
 578         .add    = ib_uverbs_add_one,
 579         .remove = ib_uverbs_remove_one
 580 };
 581
 582 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 583 {
 584         struct ib_uverbs_device *dev =
 585                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 586
 587         return sprintf(buf, "%s\n", dev->ib_dev->name);
 588 }
 589 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 590
 591 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 592 {
 593         struct ib_uverbs_device *dev =
 594                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 595
 596         cdev_del(&dev->dev);
 597         clear_bit(dev->devnum, dev_map);
 598         kfree(dev);
 599 }
 600
 601 static struct class uverbs_class = {
 602         .name    = "infiniband_verbs",
 603         .release = ib_uverbs_release_class_dev
 604 };
 605
 606 static ssize_t show_abi_version(struct class *class, char *buf)
 607 {
 608         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 609 }
 610 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 611
 612 static void ib_uverbs_add_one(struct ib_device *device)
 613 {
 614         struct ib_uverbs_device *uverbs_dev;
 615
 616         if (!device->alloc_ucontext)
 617                 return;
 618
 619         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 620         if (!uverbs_dev)
 621                 return;
 622
 623         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 624
 625         spin_lock(&map_lock);
 626         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 627         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 628                 spin_unlock(&map_lock);
 629                 goto err;
 630         }
 631         set_bit(uverbs_dev->devnum, dev_map);
 632         spin_unlock(&map_lock);
 633
 634         uverbs_dev->ib_dev   = device;
 635         uverbs_dev->num_comp = 1;
 636
 637         if (device->mmap)
 638                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 639         else
 640                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 641         uverbs_dev->dev.owner = THIS_MODULE;
 642         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 643         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 644                 goto err;
 645
 646         uverbs_dev->class_dev.class = &uverbs_class;
 647         uverbs_dev->class_dev.dev   = device->dma_device;
 648         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 649         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 650         if (class_device_register(&uverbs_dev->class_dev))
 651                 goto err_cdev;
 652
 653         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 654                 goto err_class;
 655
 656         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 657
 658         return;
 659
 660 err_class:
 661         class_device_unregister(&uverbs_dev->class_dev);
 662
 663 err_cdev:
 664         cdev_del(&uverbs_dev->dev);
 665         clear_bit(uverbs_dev->devnum, dev_map);
 666
 667 err:
 668         kfree(uverbs_dev);
 669         return;
 670 }
 671
 672 static void ib_uverbs_remove_one(struct ib_device *device)
 673 {
 674         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 675
 676         if (!uverbs_dev)
 677                 return;
 678
 679         class_device_unregister(&uverbs_dev->class_dev);
 680 }
 681
 682 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 683                                                const char *dev_name, void *data)
 684 {
 685         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 686                              INFINIBANDEVENTFS_MAGIC);
 687 }
 688
 689 static struct file_system_type uverbs_event_fs = {
 690         /* No owner field so module can be unloaded */
 691         .name    = "infinibandeventfs",
 692         .get_sb  = uverbs_event_get_sb,
 693         .kill_sb = kill_litter_super
 694 };
 695
 696 static int __init ib_uverbs_init(void)
 697 {
 698         int ret;
 699
 700         spin_lock_init(&map_lock);
 701
 702         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 703                                      "infiniband_verbs");
 704         if (ret) {
 705                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 706                 goto out;
 707         }
 708
 709         ret = class_register(&uverbs_class);
 710         if (ret) {
 711                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 712                 goto out_chrdev;
 713         }
 714
 715         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 716         if (ret) {
 717                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 718                 goto out_class;
 719         }
 720
 721         ret = register_filesystem(&uverbs_event_fs);
 722         if (ret) {
 723                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 724                 goto out_class;
 725         }
 726
 727         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 728         if (IS_ERR(uverbs_event_mnt)) {
 729                 ret = PTR_ERR(uverbs_event_mnt);
 730                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 731                 goto out_fs;
 732         }
 733
 734         ret = ib_register_client(&uverbs_client);
 735         if (ret) {
 736                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 737                 goto out_mnt;
 738         }
 739
 740         return 0;
 741
 742 out_mnt:
 743         mntput(uverbs_event_mnt);
 744
 745 out_fs:
 746         unregister_filesystem(&uverbs_event_fs);
 747
 748 out_class:
 749         class_unregister(&uverbs_class);
 750
 751 out_chrdev:
 752         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 753
 754 out:
 755         return ret;
 756 }
 757
 758 static void __exit ib_uverbs_cleanup(void)
 759 {
 760         ib_unregister_client(&uverbs_client);
 761         mntput(uverbs_event_mnt);
 762         unregister_filesystem(&uverbs_event_fs);
 763         class_unregister(&uverbs_class);
 764         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 765 }
 766
 767 module_init(ib_uverbs_init);
 768 module_exit(ib_uverbs_cleanup);