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 #include <linux/cdev.h>
  48
  49 #include <asm/uaccess.h>
  50
  51 #include "uverbs.h"
  52
  53 MODULE_AUTHOR("Roland Dreier");
  54 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  55 MODULE_LICENSE("Dual BSD/GPL");
  56
  57 #define INFINIBANDEVENTFS_MAGIC 0x49426576      /* "IBev" */
  58
  59 enum {
  60         IB_UVERBS_MAJOR       = 231,
  61         IB_UVERBS_BASE_MINOR  = 192,
  62         IB_UVERBS_MAX_DEVICES = 32
  63 };
  64
  65 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  66
  67 static struct class *uverbs_class;
  68
  69 DEFINE_MUTEX(ib_uverbs_idr_mutex);
  70 DEFINE_IDR(ib_uverbs_pd_idr);
  71 DEFINE_IDR(ib_uverbs_mr_idr);
  72 DEFINE_IDR(ib_uverbs_mw_idr);
  73 DEFINE_IDR(ib_uverbs_ah_idr);
  74 DEFINE_IDR(ib_uverbs_cq_idr);
  75 DEFINE_IDR(ib_uverbs_qp_idr);
  76 DEFINE_IDR(ib_uverbs_srq_idr);
  77
  78 static spinlock_t map_lock;
  79 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES];
  80 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  81
  82 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  83                                      const char __user *buf, int in_len,
  84                                      int out_len) = {
  85         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  86         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  87         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  88         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  89         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  90         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  91         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  92         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  93         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  94         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  95         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  96         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  97         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  98         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  99         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 100         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 101         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 102         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 103         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 104         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 105         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 106         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 107         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 108         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_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         kfree(dev);
 123 }
 124
 125 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 126                           struct ib_uverbs_event_file *ev_file,
 127                           struct ib_ucq_object *uobj)
 128 {
 129         struct ib_uverbs_event *evt, *tmp;
 130
 131         if (ev_file) {
 132                 spin_lock_irq(&ev_file->lock);
 133                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 134                         list_del(&evt->list);
 135                         kfree(evt);
 136                 }
 137                 spin_unlock_irq(&ev_file->lock);
 138
 139                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 140         }
 141
 142         spin_lock_irq(&file->async_file->lock);
 143         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 144                 list_del(&evt->list);
 145                 kfree(evt);
 146         }
 147         spin_unlock_irq(&file->async_file->lock);
 148 }
 149
 150 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 151                               struct ib_uevent_object *uobj)
 152 {
 153         struct ib_uverbs_event *evt, *tmp;
 154
 155         spin_lock_irq(&file->async_file->lock);
 156         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 157                 list_del(&evt->list);
 158                 kfree(evt);
 159         }
 160         spin_unlock_irq(&file->async_file->lock);
 161 }
 162
 163 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 164                                     struct ib_uqp_object *uobj)
 165 {
 166         struct ib_uverbs_mcast_entry *mcast, *tmp;
 167
 168         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 169                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 170                 list_del(&mcast->list);
 171                 kfree(mcast);
 172         }
 173 }
 174
 175 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 176                                       struct ib_ucontext *context)
 177 {
 178         struct ib_uobject *uobj, *tmp;
 179
 180         if (!context)
 181                 return 0;
 182
 183         mutex_lock(&ib_uverbs_idr_mutex);
 184
 185         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 186                 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id);
 187                 idr_remove(&ib_uverbs_ah_idr, uobj->id);
 188                 ib_destroy_ah(ah);
 189                 list_del(&uobj->list);
 190                 kfree(uobj);
 191         }
 192
 193         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 194                 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id);
 195                 struct ib_uqp_object *uqp =
 196                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 197                 idr_remove(&ib_uverbs_qp_idr, uobj->id);
 198                 ib_uverbs_detach_umcast(qp, uqp);
 199                 ib_destroy_qp(qp);
 200                 list_del(&uobj->list);
 201                 ib_uverbs_release_uevent(file, &uqp->uevent);
 202                 kfree(uqp);
 203         }
 204
 205         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 206                 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id);
 207                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 208                 struct ib_ucq_object *ucq =
 209                         container_of(uobj, struct ib_ucq_object, uobject);
 210                 idr_remove(&ib_uverbs_cq_idr, uobj->id);
 211                 ib_destroy_cq(cq);
 212                 list_del(&uobj->list);
 213                 ib_uverbs_release_ucq(file, ev_file, ucq);
 214                 kfree(ucq);
 215         }
 216
 217         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 218                 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id);
 219                 struct ib_uevent_object *uevent =
 220                         container_of(uobj, struct ib_uevent_object, uobject);
 221                 idr_remove(&ib_uverbs_srq_idr, uobj->id);
 222                 ib_destroy_srq(srq);
 223                 list_del(&uobj->list);
 224                 ib_uverbs_release_uevent(file, uevent);
 225                 kfree(uevent);
 226         }
 227
 228         /* XXX Free MWs */
 229
 230         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 231                 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id);
 232                 struct ib_device *mrdev = mr->device;
 233                 struct ib_umem_object *memobj;
 234
 235                 idr_remove(&ib_uverbs_mr_idr, uobj->id);
 236                 ib_dereg_mr(mr);
 237
 238                 memobj = container_of(uobj, struct ib_umem_object, uobject);
 239                 ib_umem_release_on_close(mrdev, &memobj->umem);
 240
 241                 list_del(&uobj->list);
 242                 kfree(memobj);
 243         }
 244
 245         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 246                 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id);
 247                 idr_remove(&ib_uverbs_pd_idr, uobj->id);
 248                 ib_dealloc_pd(pd);
 249                 list_del(&uobj->list);
 250                 kfree(uobj);
 251         }
 252
 253         mutex_unlock(&ib_uverbs_idr_mutex);
 254
 255         return context->device->dealloc_ucontext(context);
 256 }
 257
 258 static void ib_uverbs_release_file(struct kref *ref)
 259 {
 260         struct ib_uverbs_file *file =
 261                 container_of(ref, struct ib_uverbs_file, ref);
 262
 263         module_put(file->device->ib_dev->owner);
 264         kref_put(&file->device->ref, ib_uverbs_release_dev);
 265
 266         kfree(file);
 267 }
 268
 269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 270                                     size_t count, loff_t *pos)
 271 {
 272         struct ib_uverbs_event_file *file = filp->private_data;
 273         struct ib_uverbs_event *event;
 274         int eventsz;
 275         int ret = 0;
 276
 277         spin_lock_irq(&file->lock);
 278
 279         while (list_empty(&file->event_list)) {
 280                 spin_unlock_irq(&file->lock);
 281
 282                 if (filp->f_flags & O_NONBLOCK)
 283                         return -EAGAIN;
 284
 285                 if (wait_event_interruptible(file->poll_wait,
 286                                              !list_empty(&file->event_list)))
 287                         return -ERESTARTSYS;
 288
 289                 spin_lock_irq(&file->lock);
 290         }
 291
 292         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 293
 294         if (file->is_async)
 295                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 296         else
 297                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 298
 299         if (eventsz > count) {
 300                 ret   = -EINVAL;
 301                 event = NULL;
 302         } else {
 303                 list_del(file->event_list.next);
 304                 if (event->counter) {
 305                         ++(*event->counter);
 306                         list_del(&event->obj_list);
 307                 }
 308         }
 309
 310         spin_unlock_irq(&file->lock);
 311
 312         if (event) {
 313                 if (copy_to_user(buf, event, eventsz))
 314                         ret = -EFAULT;
 315                 else
 316                         ret = eventsz;
 317         }
 318
 319         kfree(event);
 320
 321         return ret;
 322 }
 323
 324 static unsigned int ib_uverbs_event_poll(struct file *filp,
 325                                          struct poll_table_struct *wait)
 326 {
 327         unsigned int pollflags = 0;
 328         struct ib_uverbs_event_file *file = filp->private_data;
 329
 330         poll_wait(filp, &file->poll_wait, wait);
 331
 332         spin_lock_irq(&file->lock);
 333         if (!list_empty(&file->event_list))
 334                 pollflags = POLLIN | POLLRDNORM;
 335         spin_unlock_irq(&file->lock);
 336
 337         return pollflags;
 338 }
 339
 340 void ib_uverbs_release_event_file(struct kref *ref)
 341 {
 342         struct ib_uverbs_event_file *file =
 343                 container_of(ref, struct ib_uverbs_event_file, ref);
 344
 345         kfree(file);
 346 }
 347
 348 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 349 {
 350         struct ib_uverbs_event_file *file = filp->private_data;
 351
 352         return fasync_helper(fd, filp, on, &file->async_queue);
 353 }
 354
 355 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 356 {
 357         struct ib_uverbs_event_file *file = filp->private_data;
 358         struct ib_uverbs_event *entry, *tmp;
 359
 360         spin_lock_irq(&file->lock);
 361         file->file = NULL;
 362         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 363                 if (entry->counter)
 364                         list_del(&entry->obj_list);
 365                 kfree(entry);
 366         }
 367         spin_unlock_irq(&file->lock);
 368
 369         ib_uverbs_event_fasync(-1, filp, 0);
 370
 371         if (file->is_async) {
 372                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 373                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 374         }
 375         kref_put(&file->ref, ib_uverbs_release_event_file);
 376
 377         return 0;
 378 }
 379
 380 static struct file_operations uverbs_event_fops = {
 381         .owner   = THIS_MODULE,
 382         .read    = ib_uverbs_event_read,
 383         .poll    = ib_uverbs_event_poll,
 384         .release = ib_uverbs_event_close,
 385         .fasync  = ib_uverbs_event_fasync
 386 };
 387
 388 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 389 {
 390         struct ib_uverbs_event_file    *file = cq_context;
 391         struct ib_ucq_object           *uobj;
 392         struct ib_uverbs_event         *entry;
 393         unsigned long                   flags;
 394
 395         if (!file)
 396                 return;
 397
 398         spin_lock_irqsave(&file->lock, flags);
 399         if (!file->file) {
 400                 spin_unlock_irqrestore(&file->lock, flags);
 401                 return;
 402         }
 403
 404         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 405         if (!entry) {
 406                 spin_unlock_irqrestore(&file->lock, flags);
 407                 return;
 408         }
 409
 410         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 411
 412         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 413         entry->counter             = &uobj->comp_events_reported;
 414
 415         list_add_tail(&entry->list, &file->event_list);
 416         list_add_tail(&entry->obj_list, &uobj->comp_list);
 417         spin_unlock_irqrestore(&file->lock, flags);
 418
 419         wake_up_interruptible(&file->poll_wait);
 420         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 421 }
 422
 423 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 424                                     __u64 element, __u64 event,
 425                                     struct list_head *obj_list,
 426                                     u32 *counter)
 427 {
 428         struct ib_uverbs_event *entry;
 429         unsigned long flags;
 430
 431         spin_lock_irqsave(&file->async_file->lock, flags);
 432         if (!file->async_file->file) {
 433                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 434                 return;
 435         }
 436
 437         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 438         if (!entry) {
 439                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 440                 return;
 441         }
 442
 443         entry->desc.async.element    = element;
 444         entry->desc.async.event_type = event;
 445         entry->counter               = counter;
 446
 447         list_add_tail(&entry->list, &file->async_file->event_list);
 448         if (obj_list)
 449                 list_add_tail(&entry->obj_list, obj_list);
 450         spin_unlock_irqrestore(&file->async_file->lock, flags);
 451
 452         wake_up_interruptible(&file->async_file->poll_wait);
 453         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 454 }
 455
 456 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 457 {
 458         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 459                                                   struct ib_ucq_object, uobject);
 460
 461         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 462                                 event->event, &uobj->async_list,
 463                                 &uobj->async_events_reported);
 464
 465 }
 466
 467 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 468 {
 469         struct ib_uevent_object *uobj;
 470
 471         uobj = container_of(event->element.qp->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_srq_event_handler(struct ib_event *event, void *context_ptr)
 480 {
 481         struct ib_uevent_object *uobj;
 482
 483         uobj = container_of(event->element.srq->uobject,
 484                             struct ib_uevent_object, uobject);
 485
 486         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 487                                 event->event, &uobj->event_list,
 488                                 &uobj->events_reported);
 489 }
 490
 491 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 492                              struct ib_event *event)
 493 {
 494         struct ib_uverbs_file *file =
 495                 container_of(handler, struct ib_uverbs_file, event_handler);
 496
 497         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 498                                 NULL, NULL);
 499 }
 500
 501 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 502                                         int is_async, int *fd)
 503 {
 504         struct ib_uverbs_event_file *ev_file;
 505         struct file *filp;
 506         int ret;
 507
 508         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 509         if (!ev_file)
 510                 return ERR_PTR(-ENOMEM);
 511
 512         kref_init(&ev_file->ref);
 513         spin_lock_init(&ev_file->lock);
 514         INIT_LIST_HEAD(&ev_file->event_list);
 515         init_waitqueue_head(&ev_file->poll_wait);
 516         ev_file->uverbs_file = uverbs_file;
 517         ev_file->async_queue = NULL;
 518         ev_file->is_async    = is_async;
 519
 520         *fd = get_unused_fd();
 521         if (*fd < 0) {
 522                 ret = *fd;
 523                 goto err;
 524         }
 525
 526         filp = get_empty_filp();
 527         if (!filp) {
 528                 ret = -ENFILE;
 529                 goto err_fd;
 530         }
 531
 532         ev_file->file      = filp;
 533
 534         /*
 535          * fops_get() can't fail here, because we're coming from a
 536          * system call on a uverbs file, which will already have a
 537          * module reference.
 538          */
 539         filp->f_op         = fops_get(&uverbs_event_fops);
 540         filp->f_vfsmnt     = mntget(uverbs_event_mnt);
 541         filp->f_dentry     = dget(uverbs_event_mnt->mnt_root);
 542         filp->f_mapping    = filp->f_dentry->d_inode->i_mapping;
 543         filp->f_flags      = O_RDONLY;
 544         filp->f_mode       = FMODE_READ;
 545         filp->private_data = ev_file;
 546
 547         return filp;
 548
 549 err_fd:
 550         put_unused_fd(*fd);
 551
 552 err:
 553         kfree(ev_file);
 554         return ERR_PTR(ret);
 555 }
 556
 557 /*
 558  * Look up a completion event file by FD.  If lookup is successful,
 559  * takes a ref to the event file struct that it returns; if
 560  * unsuccessful, returns NULL.
 561  */
 562 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 563 {
 564         struct ib_uverbs_event_file *ev_file = NULL;
 565         struct file *filp;
 566
 567         filp = fget(fd);
 568         if (!filp)
 569                 return NULL;
 570
 571         if (filp->f_op != &uverbs_event_fops)
 572                 goto out;
 573
 574         ev_file = filp->private_data;
 575         if (ev_file->is_async) {
 576                 ev_file = NULL;
 577                 goto out;
 578         }
 579
 580         kref_get(&ev_file->ref);
 581
 582 out:
 583         fput(filp);
 584         return ev_file;
 585 }
 586
 587 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 588                              size_t count, loff_t *pos)
 589 {
 590         struct ib_uverbs_file *file = filp->private_data;
 591         struct ib_uverbs_cmd_hdr hdr;
 592
 593         if (count < sizeof hdr)
 594                 return -EINVAL;
 595
 596         if (copy_from_user(&hdr, buf, sizeof hdr))
 597                 return -EFAULT;
 598
 599         if (hdr.in_words * 4 != count)
 600                 return -EINVAL;
 601
 602         if (hdr.command < 0                             ||
 603             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 604             !uverbs_cmd_table[hdr.command]              ||
 605             !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 606                 return -EINVAL;
 607
 608         if (!file->ucontext &&
 609             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 610                 return -EINVAL;
 611
 612         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 613                                              hdr.in_words * 4, hdr.out_words * 4);
 614 }
 615
 616 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 617 {
 618         struct ib_uverbs_file *file = filp->private_data;
 619
 620         if (!file->ucontext)
 621                 return -ENODEV;
 622         else
 623                 return file->device->ib_dev->mmap(file->ucontext, vma);
 624 }
 625
 626 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 627 {
 628         struct ib_uverbs_device *dev;
 629         struct ib_uverbs_file *file;
 630         int ret;
 631
 632         spin_lock(&map_lock);
 633         dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR];
 634         if (dev)
 635                 kref_get(&dev->ref);
 636         spin_unlock(&map_lock);
 637
 638         if (!dev)
 639                 return -ENXIO;
 640
 641         if (!try_module_get(dev->ib_dev->owner)) {
 642                 ret = -ENODEV;
 643                 goto err;
 644         }
 645
 646         file = kmalloc(sizeof *file, GFP_KERNEL);
 647         if (!file) {
 648                 ret = -ENOMEM;
 649                 goto err_module;
 650         }
 651
 652         file->device     = dev;
 653         file->ucontext   = NULL;
 654         file->async_file = NULL;
 655         kref_init(&file->ref);
 656         mutex_init(&file->mutex);
 657
 658         filp->private_data = file;
 659
 660         return 0;
 661
 662 err_module:
 663         module_put(dev->ib_dev->owner);
 664
 665 err:
 666         kref_put(&dev->ref, ib_uverbs_release_dev);
 667
 668         return ret;
 669 }
 670
 671 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 672 {
 673         struct ib_uverbs_file *file = filp->private_data;
 674
 675         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 676
 677         if (file->async_file)
 678                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 679
 680         kref_put(&file->ref, ib_uverbs_release_file);
 681
 682         return 0;
 683 }
 684
 685 static struct file_operations uverbs_fops = {
 686         .owner   = THIS_MODULE,
 687         .write   = ib_uverbs_write,
 688         .open    = ib_uverbs_open,
 689         .release = ib_uverbs_close
 690 };
 691
 692 static struct file_operations uverbs_mmap_fops = {
 693         .owner   = THIS_MODULE,
 694         .write   = ib_uverbs_write,
 695         .mmap    = ib_uverbs_mmap,
 696         .open    = ib_uverbs_open,
 697         .release = ib_uverbs_close
 698 };
 699
 700 static struct ib_client uverbs_client = {
 701         .name   = "uverbs",
 702         .add    = ib_uverbs_add_one,
 703         .remove = ib_uverbs_remove_one
 704 };
 705
 706 static ssize_t show_ibdev(struct class_device *class_dev, char *buf)
 707 {
 708         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 709
 710         if (!dev)
 711                 return -ENODEV;
 712
 713         return sprintf(buf, "%s\n", dev->ib_dev->name);
 714 }
 715 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 716
 717 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf)
 718 {
 719         struct ib_uverbs_device *dev = class_get_devdata(class_dev);
 720
 721         if (!dev)
 722                 return -ENODEV;
 723
 724         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 725 }
 726 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 727
 728 static ssize_t show_abi_version(struct class *class, char *buf)
 729 {
 730         return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION);
 731 }
 732 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL);
 733
 734 static void ib_uverbs_add_one(struct ib_device *device)
 735 {
 736         struct ib_uverbs_device *uverbs_dev;
 737
 738         if (!device->alloc_ucontext)
 739                 return;
 740
 741         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 742         if (!uverbs_dev)
 743                 return;
 744
 745         kref_init(&uverbs_dev->ref);
 746
 747         spin_lock(&map_lock);
 748         uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 749         if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) {
 750                 spin_unlock(&map_lock);
 751                 goto err;
 752         }
 753         set_bit(uverbs_dev->devnum, dev_map);
 754         spin_unlock(&map_lock);
 755
 756         uverbs_dev->ib_dev           = device;
 757         uverbs_dev->num_comp_vectors = 1;
 758
 759         uverbs_dev->dev = cdev_alloc();
 760         if (!uverbs_dev->dev)
 761                 goto err;
 762         uverbs_dev->dev->owner = THIS_MODULE;
 763         uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 764         kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum);
 765         if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1))
 766                 goto err_cdev;
 767
 768         uverbs_dev->class_dev = class_device_create(uverbs_class, NULL,
 769                                                     uverbs_dev->dev->dev,
 770                                                     device->dma_device,
 771                                                     "uverbs%d", uverbs_dev->devnum);
 772         if (IS_ERR(uverbs_dev->class_dev))
 773                 goto err_cdev;
 774
 775         class_set_devdata(uverbs_dev->class_dev, uverbs_dev);
 776
 777         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev))
 778                 goto err_class;
 779         if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version))
 780                 goto err_class;
 781
 782         spin_lock(&map_lock);
 783         dev_table[uverbs_dev->devnum] = uverbs_dev;
 784         spin_unlock(&map_lock);
 785
 786         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 787
 788         return;
 789
 790 err_class:
 791         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 792
 793 err_cdev:
 794         cdev_del(uverbs_dev->dev);
 795         clear_bit(uverbs_dev->devnum, dev_map);
 796
 797 err:
 798         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 799         return;
 800 }
 801
 802 static void ib_uverbs_remove_one(struct ib_device *device)
 803 {
 804         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 805
 806         if (!uverbs_dev)
 807                 return;
 808
 809         class_set_devdata(uverbs_dev->class_dev, NULL);
 810         class_device_destroy(uverbs_class, uverbs_dev->dev->dev);
 811         cdev_del(uverbs_dev->dev);
 812
 813         spin_lock(&map_lock);
 814         dev_table[uverbs_dev->devnum] = NULL;
 815         spin_unlock(&map_lock);
 816
 817         clear_bit(uverbs_dev->devnum, dev_map);
 818         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 819 }
 820
 821 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags,
 822                                                const char *dev_name, void *data)
 823 {
 824         return get_sb_pseudo(fs_type, "infinibandevent:", NULL,
 825                              INFINIBANDEVENTFS_MAGIC);
 826 }
 827
 828 static struct file_system_type uverbs_event_fs = {
 829         /* No owner field so module can be unloaded */
 830         .name    = "infinibandeventfs",
 831         .get_sb  = uverbs_event_get_sb,
 832         .kill_sb = kill_litter_super
 833 };
 834
 835 static int __init ib_uverbs_init(void)
 836 {
 837         int ret;
 838
 839         spin_lock_init(&map_lock);
 840
 841         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 842                                      "infiniband_verbs");
 843         if (ret) {
 844                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 845                 goto out;
 846         }
 847
 848         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 849         if (IS_ERR(uverbs_class)) {
 850                 ret = PTR_ERR(uverbs_class);
 851                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 852                 goto out_chrdev;
 853         }
 854
 855         ret = class_create_file(uverbs_class, &class_attr_abi_version);
 856         if (ret) {
 857                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 858                 goto out_class;
 859         }
 860
 861         ret = register_filesystem(&uverbs_event_fs);
 862         if (ret) {
 863                 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n");
 864                 goto out_class;
 865         }
 866
 867         uverbs_event_mnt = kern_mount(&uverbs_event_fs);
 868         if (IS_ERR(uverbs_event_mnt)) {
 869                 ret = PTR_ERR(uverbs_event_mnt);
 870                 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n");
 871                 goto out_fs;
 872         }
 873
 874         ret = ib_register_client(&uverbs_client);
 875         if (ret) {
 876                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 877                 goto out_mnt;
 878         }
 879
 880         return 0;
 881
 882 out_mnt:
 883         mntput(uverbs_event_mnt);
 884
 885 out_fs:
 886         unregister_filesystem(&uverbs_event_fs);
 887
 888 out_class:
 889         class_destroy(uverbs_class);
 890
 891 out_chrdev:
 892         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 893
 894 out:
 895         return ret;
 896 }
 897
 898 static void __exit ib_uverbs_cleanup(void)
 899 {
 900         ib_unregister_client(&uverbs_client);
 901         mntput(uverbs_event_mnt);
 902         unregister_filesystem(&uverbs_event_fs);
 903         class_destroy(uverbs_class);
 904         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 905         flush_scheduled_work();
 906         idr_destroy(&ib_uverbs_pd_idr);
 907         idr_destroy(&ib_uverbs_mr_idr);
 908         idr_destroy(&ib_uverbs_mw_idr);
 909         idr_destroy(&ib_uverbs_ah_idr);
 910         idr_destroy(&ib_uverbs_cq_idr);
 911         idr_destroy(&ib_uverbs_qp_idr);
 912         idr_destroy(&ib_uverbs_srq_idr);
 913 }
 914
 915 module_init(ib_uverbs_init);
 916 module_exit(ib_uverbs_cleanup);