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