git.oblomov.eu Git - linux-2.6/blob - drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005 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
  48 #include <asm/uaccess.h>
  49
  50 #include "uverbs.h"
  51
  52 MODULE_AUTHOR("Roland Dreier");
  53 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  54 MODULE_LICENSE("Dual BSD/GPL");
  55
  56 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  57
  58 enum {
  59         IB_UVERBS_MAJOR       = 231,
  60         IB_UVERBS_BASE_MINOR  = 192,
  61         IB_UVERBS_MAX_DEVICES = 32
  62 };
  63
  64 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  65
  66 DECLARE_MUTEX(ib_uverbs_idr_mutex);
  67 DEFINE_IDR(ib_uverbs_pd_idr);
  68 DEFINE_IDR(ib_uverbs_mr_idr);
  69 DEFINE_IDR(ib_uverbs_mw_idr);
  70 DEFINE_IDR(ib_uverbs_ah_idr);
  71 DEFINE_IDR(ib_uverbs_cq_idr);
  72 DEFINE_IDR(ib_uverbs_qp_idr);
  73 DEFINE_IDR(ib_uverbs_srq_idr);
  74
  75 static spinlock_t map_lock;
  76 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  77
  78 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  79                                      const char __user *buf, int in_len,
  80                                      int out_len) = {
  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_ALLOC_PD]            = ib_uverbs_alloc_pd,
  85         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  86         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  87         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  88         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  89         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  90         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  91         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  92         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  93         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  94         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  95         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
  96         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
  97         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
  98         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
  99         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 100         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 101         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 102         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 103         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 104         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 105         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 106 };
 107
 108 static struct vfsmount *uverbs_event_mnt;
 109
 110 static void ib_uverbs_add_one(struct ib_device *device);
 111 static void ib_uverbs_remove_one(struct ib_device *device);
 112
 113 static int ib_dealloc_ucontext(struct ib_ucontext *context)
 114 {
 115         struct ib_uobject *uobj, *tmp;
 116
 117         if (!context)
 118                 return 0;
 119
 120         down(&ib_uverbs_idr_mutex);
 121
 122         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 123                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
 124                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
 125                 ib_destroy_ah(ah);
 126                 list_del(&uobj->list);
 127                 kfree(uobj);
 128         }
 129
 130         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 131                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 132                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 133                 ib_destroy_qp(qp);
 134                 list_del(&uobj->list);
 135                 kfree(container_of(uobj, struct ib_uevent_object, uobject));
 136         }
 137
 138         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 139                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 140                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 141                 ib_destroy_cq(cq);
 142                 list_del(&uobj->list);
 143                 kfree(container_of(uobj, struct ib_ucq_object, uobject));
 144         }
 145
 146         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 147                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
 148                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
 149                 ib_destroy_srq(srq);
 150                 list_del(&uobj->list);
 151                 kfree(container_of(uobj, struct ib_uevent_object, uobject));
 152         }
 153
 154         /* XXX Free MWs */
 155
 156         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 157                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 158                 struct ib_device *mrdev = mr->device;
 159                 struct ib_umem_object *memobj;
 160
 161                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 162                 ib_dereg_mr(mr);
 163
 164                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 165                 ib_umem_release_on_close(mrdev, &memobj->umem);
 166
 167                 list_del(&uobj->list);
 168                 kfree(memobj);
 169         }
 170
 171         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 172                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 173                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 174                 ib_dealloc_pd(pd);
 175                 list_del(&uobj->list);
 176                 kfree(uobj);
 177         }
 178
 179         up(&ib_uverbs_idr_mutex);
 180
 181         return context->device->dealloc_ucontext(context);
 182 }
 183
 184 static void ib_uverbs_release_file(struct kref *ref)
 185 {
 186         struct ib_uverbs_file *file =
 187                 container_of(ref, struct ib_uverbs_file, ref);
 188
 189         module_put(file->device->ib_dev->owner);
 190         kfree(file);
 191 }
 192
 193 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 194                                     size_t count, loff_t *pos)
 195 {
 196         struct ib_uverbs_event_file *file = filp->private_data;
 197         struct ib_uverbs_event *event;
 198         int eventsz;
 199         int ret = 0;
 200
 201         spin_lock_irq(&file->lock);
 202
 203         while (list_empty(&file->event_list)) {
 204                 spin_unlock_irq(&file->lock);
 205
 206                 if (filp->f_flags & O_NONBLOCK)
 207                         return -EAGAIN;
 208
 209                 if (wait_event_interruptible(file->poll_wait,
 210                                              !list_empty(&file->event_list)))
 211                         return -ERESTARTSYS;
 212
 213                 spin_lock_irq(&file->lock);
 214         }
 215
 216         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 217
 218         if (file->is_async)
 219                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 220         else
 221                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 222
 223         if (eventsz > count) {
 224                 ret   = -EINVAL;
 225                 event = NULL;
 226         } else {
 227                 list_del(file->event_list.next);
 228                 if (event->counter) {
 229                         ++(*event->counter);
 230                         list_del(&event->obj_list);
 231                 }
 232         }
 233
 234         spin_unlock_irq(&file->lock);
 235
 236         if (event) {
 237                 if (copy_to_user(buf, event, eventsz))
 238                         ret = -EFAULT;
 239                 else
 240                         ret = eventsz;
 241         }
 242
 243         kfree(event);
 244
 245         return ret;
 246 }
 247
 248 static unsigned int ib_uverbs_event_poll(struct file *filp,
 249                                          struct poll_table_struct *wait)
 250 {
 251         unsigned int pollflags = 0;
 252         struct ib_uverbs_event_file *file = filp->private_data;
 253
 254         poll_wait(filp, &file->poll_wait, wait);
 255
 256         spin_lock_irq(&file->lock);
 257         if (!list_empty(&file->event_list))
 258                 pollflags = POLLIN | POLLRDNORM;
 259         spin_unlock_irq(&file->lock);
 260
 261         return pollflags;
 262 }
 263
 264 void ib_uverbs_release_event_file(struct kref *ref)
 265 {
 266         struct ib_uverbs_event_file *file =
 267                 container_of(ref, struct ib_uverbs_event_file, ref);
 268
 269         kfree(file);
 270 }
 271
 272 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 273 {
 274         struct ib_uverbs_event_file *file = filp->private_data;
 275
 276         return fasync_helper(fd, filp, on, &file->async_queue);
 277 }
 278
 279 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 280 {
 281         struct ib_uverbs_event_file *file = filp->private_data;
 282         struct ib_uverbs_event *entry, *tmp;
 283
 284         spin_lock_irq(&file->lock);
 285         file->file = NULL;
 286         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 287                 if (entry->counter)
 288                         list_del(&entry->obj_list);
 289                 kfree(entry);
 290         }
 291         spin_unlock_irq(&file->lock);
 292
 293         ib_uverbs_event_fasync(-1, filp, 0);
 294
 295         if (file->is_async) {
 296                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 297                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 298         }
 299         kref_put(&file->ref, ib_uverbs_release_event_file);
 300
 301         return 0;
 302 }
 303
 304 static struct file_operations uverbs_event_fops = {
 305         .owner   = THIS_MODULE,
 306         .read    = ib_uverbs_event_read,
 307         .poll    = ib_uverbs_event_poll,
 308         .release = ib_uverbs_event_close,
 309         .fasync  = ib_uverbs_event_fasync
 310 };
 311
 312 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 313 {
 314         struct ib_uverbs_event_file    *file = cq_context;
 315         struct ib_ucq_object           *uobj;
 316         struct ib_uverbs_event         *entry;
 317         unsigned long                   flags;
 318
 319         if (!file)
 320                 return;
 321
 322         spin_lock_irqsave(&file->lock, flags);
 323         if (!file->file) {
 324                 spin_unlock_irqrestore(&file->lock, flags);
 325                 return;
 326         }
 327
 328         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 329         if (!entry) {
 330                 spin_unlock_irqrestore(&file->lock, flags);
 331                 return;
 332         }
 333
 334         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 335
 336         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 337         entry->counter             = &uobj->comp_events_reported;
 338
 339         list_add_tail(&entry->list, &file->event_list);
 340         list_add_tail(&entry->obj_list, &uobj->comp_list);
 341         spin_unlock_irqrestore(&file->lock, flags);
 342
 343         wake_up_interruptible(&file->poll_wait);
 344         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 345 }
 346
 347 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 348                                     __u64 element, __u64 event,
 349                                     struct list_head *obj_list,
 350                                     u32 *counter)
 351 {
 352         struct ib_uverbs_event *entry;
 353         unsigned long flags;
 354
 355         spin_lock_irqsave(&file->async_file->lock, flags);
 356         if (!file->async_file->file) {
 357                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 358                 return;
 359         }
 360
 361         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 362         if (!entry) {
 363                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 364                 return;
 365         }
 366
 367         entry->desc.async.element    = element;
 368         entry->desc.async.event_type = event;
 369         entry->counter               = counter;
 370
 371         list_add_tail(&entry->list, &file->async_file->event_list);
 372         if (obj_list)
 373                 list_add_tail(&entry->obj_list, obj_list);
 374         spin_unlock_irqrestore(&file->async_file->lock, flags);
 375
 376         wake_up_interruptible(&file->async_file->poll_wait);
 377         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 378 }
 379
 380 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 381 {
 382         struct ib_uverbs_event_file *ev_file = context_ptr;
 383         struct ib_ucq_object *uobj;
 384
 385         uobj = container_of(event->element.cq->uobject,
 386                             struct ib_ucq_object, uobject);
 387
 388         ib_uverbs_async_handler(ev_file->uverbs_file, uobj->uobject.user_handle,
 389                                 event->event, &uobj->async_list,
 390                                 &uobj->async_events_reported);
 391
 392 }
 393
 394 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 395 {
 396         struct ib_uevent_object *uobj;
 397
 398         uobj = container_of(event->element.qp->uobject,
 399                             struct ib_uevent_object, uobject);
 400
 401         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 402                                 event->event, &uobj->event_list,
 403                                 &uobj->events_reported);
 404 }
 405
 406 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 407 {
 408         struct ib_uevent_object *uobj;
 409
 410         uobj = container_of(event->element.srq->uobject,
 411                             struct ib_uevent_object, uobject);
 412
 413         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 414                                 event->event, &uobj->event_list,
 415                                 &uobj->events_reported);
 416 }
 417
 418 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 419                              struct ib_event *event)
 420 {
 421         struct ib_uverbs_file *file =
 422                 container_of(handler, struct ib_uverbs_file, event_handler);
 423
 424         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 425                                 NULL, NULL);
 426 }
 427
 428 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 429                                         int is_async, int *fd)
 430 {
 431         struct ib_uverbs_event_file *ev_file;
 432         struct file *filp;
 433         int ret;
 434
 435         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 436         if (!ev_file)
 437                 return ERR_PTR(-ENOMEM);
 438
 439         kref_init(&ev_file->ref);
 440         spin_lock_init(&ev_file->lock);
 441         INIT_LIST_HEAD(&ev_file->event_list);
 442         init_waitqueue_head(&ev_file->poll_wait);
 443         ev_file->uverbs_file = uverbs_file;
 444         ev_file->async_queue = NULL;
 445         ev_file->is_async    = is_async;
 446
 447         *fd = get_unused_fd();
 448         if (*fd < 0) {
 449                 ret = *fd;
 450                 goto err;
 451         }
 452
 453         filp = get_empty_filp();
 454         if (!filp) {
 455                 ret = -ENFILE;
 456                 goto err_fd;
 457         }
 458
 459         ev_file->file      = filp;
 460
 461         /*
 462          * fops_get() can't fail here, because we're coming from a
 463          * system call on a uverbs file, which will already have a
 464          * module reference.
 465          */
 466         filp->f_op         = fops_get(&uverbs_event_fops);
 467         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 468         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 469         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 470         filp->f_flags      = O_RDONLY;
 471         filp->f_mode       = FMODE_READ;
 472         filp->private_data = ev_file;
 473
 474         return filp;
 475
 476 err_fd:
 477         put_unused_fd(*fd);
 478
 479 err:
 480         kfree(ev_file);
 481         return ERR_PTR(ret);
 482 }
 483
 484 /*
 485  * Look up a completion event file by FD.  If lookup is successful,
 486  * takes a ref to the event file struct that it returns; if
 487  * unsuccessful, returns NULL.
 488  */
 489 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 490 {
 491         struct ib_uverbs_event_file *ev_file = NULL;
 492         struct file *filp;
 493
 494         filp = fget(fd);
 495         if (!filp)
 496                 return NULL;
 497
 498         if (filp->f_op != &uverbs_event_fops)
 499                 goto out;
 500
 501         ev_file = filp->private_data;
 502         if (ev_file->is_async) {
 503                 ev_file = NULL;
 504                 goto out;
 505         }
 506
 507         kref_get(&ev_file->ref);
 508
 509 out:
 510         fput(filp);
 511         return ev_file;
 512 }
 513
 514 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 515                              size_t count, loff_t *pos)
 516 {
 517         struct ib_uverbs_file *file = filp->private_data;
 518         struct ib_uverbs_cmd_hdr hdr;
 519
 520         if (count < sizeof hdr)
 521                 return -EINVAL;
 522
 523         if (copy_from_user(&hdr, buf, sizeof hdr))
 524                 return -EFAULT;
 525
 526         if (hdr.in_words * 4 != count)
 527                 return -EINVAL;
 528
 529         if (hdr.command < 0                             ||
 530             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 531             !uverbs_cmd_table[hdr.command]              ||
 532             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 533                 return -EINVAL;
 534
 535         if (!file->ucontext &&
 536             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 537                 return -EINVAL;
 538
 539         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 540                                              hdr.in_words * 4, hdr.out_words * 4);
 541 }
 542
 543 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 544 {
 545         struct ib_uverbs_file *file = filp->private_data;
 546
 547         if (!file->ucontext)
 548                 return -ENODEV;
 549         else
 550                 return file->device->ib_dev->mmap(file->ucontext, vma);
 551 }
 552
 553 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 554 {
 555         struct ib_uverbs_device *dev =
 556                 container_of(inode->i_cdev, struct ib_uverbs_device, dev);
 557         struct ib_uverbs_file *file;
 558
 559         if (!try_module_get(dev->ib_dev->owner))
 560                 return -ENODEV;
 561
 562         file = kmalloc(sizeof *file, GFP_KERNEL);
 563         if (!file) {
 564                 module_put(dev->ib_dev->owner);
 565                 return -ENOMEM;
 566         }
 567
 568         file->device   = dev;
 569         file->ucontext = NULL;
 570         kref_init(&file->ref);
 571         init_MUTEX(&file->mutex);
 572
 573         filp->private_data = file;
 574
 575         return 0;
 576 }
 577
 578 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 579 {
 580         struct ib_uverbs_file *file = filp->private_data;
 581
 582         ib_dealloc_ucontext(file->ucontext);
 583
 584         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 585         kref_put(&file->ref, ib_uverbs_release_file);
 586
 587         return 0;
 588 }
 589
 590 static struct file_operations uverbs_fops = {
 591         .owner   = THIS_MODULE,
 592         .write   = ib_uverbs_write,
 593         .open    = ib_uverbs_open,
 594         .release = ib_uverbs_close
 595 };
 596
 597 static struct file_operations uverbs_mmap_fops = {
 598         .owner   = THIS_MODULE,
 599         .write   = ib_uverbs_write,
 600         .mmap    = ib_uverbs_mmap,
 601         .open    = ib_uverbs_open,
 602         .release = ib_uverbs_close
 603 };
 604
 605 static struct ib_client uverbs_client = {
 606         .name   = "uverbs",
 607         .add    = ib_uverbs_add_one,
 608         .remove = ib_uverbs_remove_one
 609 };
 610
 611 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 612 {
 613         struct ib_uverbs_device *dev =
 614                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 615
 616         return sprintf(buf, "%s\n", dev->ib_dev->name);
 617 }
 618 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 619
 620 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
 621 {
 622         struct ib_uverbs_device *dev =
 623                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 624
 625         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 626 }
 627 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 628
 629 static void ib_uverbs_release_class_dev(struct class_device *class_dev)
 630 {
 631         struct ib_uverbs_device *dev =
 632                 container_of(class_dev, struct ib_uverbs_device, class_dev);
 633
 634         cdev_del(&dev->dev);
 635         clear_bit(dev->devnum, dev_map);
 636         kfree(dev);
 637 }
 638
 639 static struct class uverbs_class = {
 640         .name    = "infiniband_verbs",
 641         .release = ib_uverbs_release_class_dev
 642 };
 643
 644 static ssize_t show_abi_version(struct class *class, char *buf)
 645 {
 646         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 647 }
 648 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 649
 650 static void ib_uverbs_add_one(struct ib_device *device)
 651 {
 652         struct ib_uverbs_device *uverbs_dev;
 653
 654         if (!device->alloc_ucontext)
 655                 return;
 656
 657         uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL);
 658         if (!uverbs_dev)
 659                 return;
 660
 661         memset(uverbs_dev, 0, sizeof *uverbs_dev);
 662
 663         spin_lock(&map_lock);
 664         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 665         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 666                 spin_unlock(&map_lock);
 667                 goto err;
 668         }
 669         set_bit(uverbs_dev->devnum, dev_map);
 670         spin_unlock(&map_lock);
 671
 672         uverbs_dev->ib_dev           = device;
 673         uverbs_dev->num_comp_vectors = 1;
 674
 675         if (device->mmap)
 676                 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops);
 677         else
 678                 cdev_init(&uverbs_dev->dev, &uverbs_fops);
 679         uverbs_dev->dev.owner = THIS_MODULE;
 680         kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum);
 681         if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 682                 goto err;
 683
 684         uverbs_dev->class_dev.class = &uverbs_class;
 685         uverbs_dev->class_dev.dev   = device->dma_device;
 686         uverbs_dev->class_dev.devt  = uverbs_dev->dev.dev;
 687         snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum);
 688         if (class_device_register(&uverbs_dev->class_dev))
 689                 goto err_cdev;
 690
 691         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev))
 692                 goto err_class;
 693         if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_abi_version))
 694                 goto err_class;
 695
 696         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 697
 698         return;
 699
 700 err_class:
 701         class_device_unregister(&uverbs_dev->class_dev);
 702
 703 err_cdev:
 704         cdev_del(&uverbs_dev->dev);
 705         clear_bit(uverbs_dev->devnum, dev_map);
 706
 707 err:
 708         kfree(uverbs_dev);
 709         return;
 710 }
 711
 712 static void ib_uverbs_remove_one(struct ib_device *device)
 713 {
 714         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 715
 716         if (!uverbs_dev)
 717                 return;
 718
 719         class_device_unregister(&uverbs_dev->class_dev);
 720 }
 721
 722 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 723                                                const char *dev_name, void *data)
 724 {
 725         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 726                              INFINIBANDEVENTFS_MAGIC);
 727 }
 728
 729 static struct file_system_type uverbs_event_fs = {
 730         /* No owner field so module can be unloaded */
 731         .name    = "infinibandeventfs",
 732         .get_sb  = uverbs_event_get_sb,
 733         .kill_sb = kill_litter_super
 734 };
 735
 736 static int __init ib_uverbs_init(void)
 737 {
 738         int ret;
 739
 740         spin_lock_init(&map_lock);
 741
 742         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 743                                      "infiniband_verbs");
 744         if (ret) {
 745                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 746                 goto out;
 747         }
 748
 749         ret = class_register(&uverbs_class);
 750         if (ret) {
 751                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 752                 goto out_chrdev;
 753         }
 754
 755         ret = class_create_file(&uverbs_class, &class_attr_abi_version);
 756         if (ret) {
 757                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 758                 goto out_class;
 759         }
 760
 761         ret = register_filesystem(&uverbs_event_fs);
 762         if (ret) {
 763                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 764                 goto out_class;
 765         }
 766
 767         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 768         if (IS_ERR(uverbs_event_mnt)) {
 769                 ret = PTR_ERR(uverbs_event_mnt);
 770                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 771                 goto out_fs;
 772         }
 773
 774         ret = ib_register_client(&uverbs_client);
 775         if (ret) {
 776                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 777                 goto out_mnt;
 778         }
 779
 780         return 0;
 781
 782 out_mnt:
 783         mntput(uverbs_event_mnt);
 784
 785 out_fs:
 786         unregister_filesystem(&uverbs_event_fs);
 787
 788 out_class:
 789         class_unregister(&uverbs_class);
 790
 791 out_chrdev:
 792         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 793
 794 out:
 795         return ret;
 796 }
 797
 798 static void __exit ib_uverbs_cleanup(void)
 799 {
 800         ib_unregister_client(&uverbs_client);
 801         mntput(uverbs_event_mnt);
 802         unregister_filesystem(&uverbs_event_fs);
 803         class_unregister(&uverbs_class);
 804         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 805         idr_destroy(&ib_uverbs_pd_idr);
 806         idr_destroy(&ib_uverbs_mr_idr);
 807         idr_destroy(&ib_uverbs_mw_idr);
 808         idr_destroy(&ib_uverbs_ah_idr);
 809         idr_destroy(&ib_uverbs_cq_idr);
 810         idr_destroy(&ib_uverbs_qp_idr);
 811         idr_destroy(&ib_uverbs_srq_idr);
 812 }
 813
 814 module_init(ib_uverbs_init);
 815 module_exit(ib_uverbs_cleanup);