drivers/infiniband/core/uverbs_main.c

   1 /*
   2  * Copyright (c) 2005 Topspin Communications.  All rights reserved.
   3  * Copyright (c) 2005, 2006 Cisco Systems.  All rights reserved.
   4  * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
   5  * Copyright (c) 2005 Voltaire, Inc. All rights reserved.
   6  * Copyright (c) 2005 PathScale, Inc. All rights reserved.
   7  *
   8  * This software is available to you under a choice of one of two
   9  * licenses.  You may choose to be licensed under the terms of the GNU
  10  * General Public License (GPL) Version 2, available from the file
  11  * COPYING in the main directory of this source tree, or the
  12  * OpenIB.org BSD license below:
  13  *
  14  *     Redistribution and use in source and binary forms, with or
  15  *     without modification, are permitted provided that the following
  16  *     conditions are met:
  17  *
  18  *      - Redistributions of source code must retain the above
  19  *        copyright notice, this list of conditions and the following
  20  *        disclaimer.
  21  *
  22  *      - Redistributions in binary form must reproduce the above
  23  *        copyright notice, this list of conditions and the following
  24  *        disclaimer in the documentation and/or other materials
  25  *        provided with the distribution.
  26  *
  27  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  28  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  29  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  30  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  31  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  32  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  33  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  34  * SOFTWARE.
  35  */
  36
  37 #include <linux/module.h>
  38 #include <linux/init.h>
  39 #include <linux/device.h>
  40 #include <linux/err.h>
  41 #include <linux/fs.h>
  42 #include <linux/poll.h>
  43 #include <linux/sched.h>
  44 #include <linux/file.h>
  45 #include <linux/cdev.h>
  46 #include <linux/anon_inodes.h>
  47 #include <linux/slab.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 enum {
  58         IB_UVERBS_MAJOR       = 231,
  59         IB_UVERBS_BASE_MINOR  = 192,
  60         IB_UVERBS_MAX_DEVICES = 32
  61 };
  62
  63 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  64
  65 static struct class *uverbs_class;
  66
  67 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  68 DEFINE_IDR(ib_uverbs_pd_idr);
  69 DEFINE_IDR(ib_uverbs_mr_idr);
  70 DEFINE_IDR(ib_uverbs_mw_idr);
  71 DEFINE_IDR(ib_uverbs_ah_idr);
  72 DEFINE_IDR(ib_uverbs_cq_idr);
  73 DEFINE_IDR(ib_uverbs_qp_idr);
  74 DEFINE_IDR(ib_uverbs_srq_idr);
  75 DEFINE_IDR(ib_uverbs_xrcd_idr);
  76 DEFINE_IDR(ib_uverbs_rule_idr);
  77
  78 static DEFINE_SPINLOCK(map_lock);
  79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  80
  81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  82                                      const char __user *buf, int in_len,
  83                                      int out_len) = {
  84         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  85         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  86         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  87         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  88         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  89         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  90         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  91         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  92         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  93         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  94         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  95         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  96         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  97         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  98         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  99         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 100         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 101         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 102         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 103         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 104         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 105         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 106         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 107         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 108         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 109         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 110         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 111         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 112         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 113         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 114         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 115         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 116         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 117         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 118 #ifdef CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING
 119         [IB_USER_VERBS_CMD_CREATE_FLOW]         = ib_uverbs_create_flow,
 120         [IB_USER_VERBS_CMD_DESTROY_FLOW]        = ib_uverbs_destroy_flow
 121 #endif /* CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING */
 122 };
 123
 124 static void ib_uverbs_add_one(struct ib_device *device);
 125 static void ib_uverbs_remove_one(struct ib_device *device);
 126
 127 static void ib_uverbs_release_dev(struct kref *ref)
 128 {
 129         struct ib_uverbs_device *dev =
 130                 container_of(ref, struct ib_uverbs_device, ref);
 131
 132         complete(&dev->comp);
 133 }
 134
 135 static void ib_uverbs_release_event_file(struct kref *ref)
 136 {
 137         struct ib_uverbs_event_file *file =
 138                 container_of(ref, struct ib_uverbs_event_file, ref);
 139
 140         kfree(file);
 141 }
 142
 143 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 144                           struct ib_uverbs_event_file *ev_file,
 145                           struct ib_ucq_object *uobj)
 146 {
 147         struct ib_uverbs_event *evt, *tmp;
 148
 149         if (ev_file) {
 150                 spin_lock_irq(&ev_file->lock);
 151                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 152                         list_del(&evt->list);
 153                         kfree(evt);
 154                 }
 155                 spin_unlock_irq(&ev_file->lock);
 156
 157                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 158         }
 159
 160         spin_lock_irq(&file->async_file->lock);
 161         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 162                 list_del(&evt->list);
 163                 kfree(evt);
 164         }
 165         spin_unlock_irq(&file->async_file->lock);
 166 }
 167
 168 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 169                               struct ib_uevent_object *uobj)
 170 {
 171         struct ib_uverbs_event *evt, *tmp;
 172
 173         spin_lock_irq(&file->async_file->lock);
 174         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 175                 list_del(&evt->list);
 176                 kfree(evt);
 177         }
 178         spin_unlock_irq(&file->async_file->lock);
 179 }
 180
 181 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 182                                     struct ib_uqp_object *uobj)
 183 {
 184         struct ib_uverbs_mcast_entry *mcast, *tmp;
 185
 186         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 187                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 188                 list_del(&mcast->list);
 189                 kfree(mcast);
 190         }
 191 }
 192
 193 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 194                                       struct ib_ucontext *context)
 195 {
 196         struct ib_uobject *uobj, *tmp;
 197
 198         if (!context)
 199                 return 0;
 200
 201         context->closing = 1;
 202
 203         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 204                 struct ib_ah *ah = uobj->object;
 205
 206                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 207                 ib_destroy_ah(ah);
 208                 kfree(uobj);
 209         }
 210
 211         /* Remove MWs before QPs, in order to support type 2A MWs. */
 212         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 213                 struct ib_mw *mw = uobj->object;
 214
 215                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 216                 ib_dealloc_mw(mw);
 217                 kfree(uobj);
 218         }
 219
 220         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 221                 struct ib_flow *flow_id = uobj->object;
 222
 223                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 224                 ib_destroy_flow(flow_id);
 225                 kfree(uobj);
 226         }
 227
 228         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 229                 struct ib_qp *qp = uobj->object;
 230                 struct ib_uqp_object *uqp =
 231                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 232
 233                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 234                 if (qp != qp->real_qp) {
 235                         ib_close_qp(qp);
 236                 } else {
 237                         ib_uverbs_detach_umcast(qp, uqp);
 238                         ib_destroy_qp(qp);
 239                 }
 240                 ib_uverbs_release_uevent(file, &uqp->uevent);
 241                 kfree(uqp);
 242         }
 243
 244         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 245                 struct ib_cq *cq = uobj->object;
 246                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 247                 struct ib_ucq_object *ucq =
 248                         container_of(uobj, struct ib_ucq_object, uobject);
 249
 250                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 251                 ib_destroy_cq(cq);
 252                 ib_uverbs_release_ucq(file, ev_file, ucq);
 253                 kfree(ucq);
 254         }
 255
 256         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 257                 struct ib_srq *srq = uobj->object;
 258                 struct ib_uevent_object *uevent =
 259                         container_of(uobj, struct ib_uevent_object, uobject);
 260
 261                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 262                 ib_destroy_srq(srq);
 263                 ib_uverbs_release_uevent(file, uevent);
 264                 kfree(uevent);
 265         }
 266
 267         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 268                 struct ib_mr *mr = uobj->object;
 269
 270                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 271                 ib_dereg_mr(mr);
 272                 kfree(uobj);
 273         }
 274
 275         mutex_lock(&file->device->xrcd_tree_mutex);
 276         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 277                 struct ib_xrcd *xrcd = uobj->object;
 278                 struct ib_uxrcd_object *uxrcd =
 279                         container_of(uobj, struct ib_uxrcd_object, uobject);
 280
 281                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 282                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 283                 kfree(uxrcd);
 284         }
 285         mutex_unlock(&file->device->xrcd_tree_mutex);
 286
 287         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 288                 struct ib_pd *pd = uobj->object;
 289
 290                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 291                 ib_dealloc_pd(pd);
 292                 kfree(uobj);
 293         }
 294
 295         return context->device->dealloc_ucontext(context);
 296 }
 297
 298 static void ib_uverbs_release_file(struct kref *ref)
 299 {
 300         struct ib_uverbs_file *file =
 301                 container_of(ref, struct ib_uverbs_file, ref);
 302
 303         module_put(file->device->ib_dev->owner);
 304         kref_put(&file->device->ref, ib_uverbs_release_dev);
 305
 306         kfree(file);
 307 }
 308
 309 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 310                                     size_t count, loff_t *pos)
 311 {
 312         struct ib_uverbs_event_file *file = filp->private_data;
 313         struct ib_uverbs_event *event;
 314         int eventsz;
 315         int ret = 0;
 316
 317         spin_lock_irq(&file->lock);
 318
 319         while (list_empty(&file->event_list)) {
 320                 spin_unlock_irq(&file->lock);
 321
 322                 if (filp->f_flags & O_NONBLOCK)
 323                         return -EAGAIN;
 324
 325                 if (wait_event_interruptible(file->poll_wait,
 326                                              !list_empty(&file->event_list)))
 327                         return -ERESTARTSYS;
 328
 329                 spin_lock_irq(&file->lock);
 330         }
 331
 332         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 333
 334         if (file->is_async)
 335                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 336         else
 337                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 338
 339         if (eventsz > count) {
 340                 ret   = -EINVAL;
 341                 event = NULL;
 342         } else {
 343                 list_del(file->event_list.next);
 344                 if (event->counter) {
 345                         ++(*event->counter);
 346                         list_del(&event->obj_list);
 347                 }
 348         }
 349
 350         spin_unlock_irq(&file->lock);
 351
 352         if (event) {
 353                 if (copy_to_user(buf, event, eventsz))
 354                         ret = -EFAULT;
 355                 else
 356                         ret = eventsz;
 357         }
 358
 359         kfree(event);
 360
 361         return ret;
 362 }
 363
 364 static unsigned int ib_uverbs_event_poll(struct file *filp,
 365                                          struct poll_table_struct *wait)
 366 {
 367         unsigned int pollflags = 0;
 368         struct ib_uverbs_event_file *file = filp->private_data;
 369
 370         poll_wait(filp, &file->poll_wait, wait);
 371
 372         spin_lock_irq(&file->lock);
 373         if (!list_empty(&file->event_list))
 374                 pollflags = POLLIN | POLLRDNORM;
 375         spin_unlock_irq(&file->lock);
 376
 377         return pollflags;
 378 }
 379
 380 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 381 {
 382         struct ib_uverbs_event_file *file = filp->private_data;
 383
 384         return fasync_helper(fd, filp, on, &file->async_queue);
 385 }
 386
 387 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 388 {
 389         struct ib_uverbs_event_file *file = filp->private_data;
 390         struct ib_uverbs_event *entry, *tmp;
 391
 392         spin_lock_irq(&file->lock);
 393         file->is_closed = 1;
 394         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 395                 if (entry->counter)
 396                         list_del(&entry->obj_list);
 397                 kfree(entry);
 398         }
 399         spin_unlock_irq(&file->lock);
 400
 401         if (file->is_async) {
 402                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 403                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 404         }
 405         kref_put(&file->ref, ib_uverbs_release_event_file);
 406
 407         return 0;
 408 }
 409
 410 static const struct file_operations uverbs_event_fops = {
 411         .owner   = THIS_MODULE,
 412         .read    = ib_uverbs_event_read,
 413         .poll    = ib_uverbs_event_poll,
 414         .release = ib_uverbs_event_close,
 415         .fasync  = ib_uverbs_event_fasync,
 416         .llseek  = no_llseek,
 417 };
 418
 419 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 420 {
 421         struct ib_uverbs_event_file    *file = cq_context;
 422         struct ib_ucq_object           *uobj;
 423         struct ib_uverbs_event         *entry;
 424         unsigned long                   flags;
 425
 426         if (!file)
 427                 return;
 428
 429         spin_lock_irqsave(&file->lock, flags);
 430         if (file->is_closed) {
 431                 spin_unlock_irqrestore(&file->lock, flags);
 432                 return;
 433         }
 434
 435         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 436         if (!entry) {
 437                 spin_unlock_irqrestore(&file->lock, flags);
 438                 return;
 439         }
 440
 441         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 442
 443         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 444         entry->counter             = &uobj->comp_events_reported;
 445
 446         list_add_tail(&entry->list, &file->event_list);
 447         list_add_tail(&entry->obj_list, &uobj->comp_list);
 448         spin_unlock_irqrestore(&file->lock, flags);
 449
 450         wake_up_interruptible(&file->poll_wait);
 451         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 452 }
 453
 454 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 455                                     __u64 element, __u64 event,
 456                                     struct list_head *obj_list,
 457                                     u32 *counter)
 458 {
 459         struct ib_uverbs_event *entry;
 460         unsigned long flags;
 461
 462         spin_lock_irqsave(&file->async_file->lock, flags);
 463         if (file->async_file->is_closed) {
 464                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 465                 return;
 466         }
 467
 468         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 469         if (!entry) {
 470                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 471                 return;
 472         }
 473
 474         entry->desc.async.element    = element;
 475         entry->desc.async.event_type = event;
 476         entry->counter               = counter;
 477
 478         list_add_tail(&entry->list, &file->async_file->event_list);
 479         if (obj_list)
 480                 list_add_tail(&entry->obj_list, obj_list);
 481         spin_unlock_irqrestore(&file->async_file->lock, flags);
 482
 483         wake_up_interruptible(&file->async_file->poll_wait);
 484         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 485 }
 486
 487 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 488 {
 489         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 490                                                   struct ib_ucq_object, uobject);
 491
 492         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 493                                 event->event, &uobj->async_list,
 494                                 &uobj->async_events_reported);
 495 }
 496
 497 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 498 {
 499         struct ib_uevent_object *uobj;
 500
 501         uobj = container_of(event->element.qp->uobject,
 502                             struct ib_uevent_object, uobject);
 503
 504         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 505                                 event->event, &uobj->event_list,
 506                                 &uobj->events_reported);
 507 }
 508
 509 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 510 {
 511         struct ib_uevent_object *uobj;
 512
 513         uobj = container_of(event->element.srq->uobject,
 514                             struct ib_uevent_object, uobject);
 515
 516         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 517                                 event->event, &uobj->event_list,
 518                                 &uobj->events_reported);
 519 }
 520
 521 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 522                              struct ib_event *event)
 523 {
 524         struct ib_uverbs_file *file =
 525                 container_of(handler, struct ib_uverbs_file, event_handler);
 526
 527         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 528                                 NULL, NULL);
 529 }
 530
 531 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 532                                         int is_async)
 533 {
 534         struct ib_uverbs_event_file *ev_file;
 535         struct file *filp;
 536
 537         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 538         if (!ev_file)
 539                 return ERR_PTR(-ENOMEM);
 540
 541         kref_init(&ev_file->ref);
 542         spin_lock_init(&ev_file->lock);
 543         INIT_LIST_HEAD(&ev_file->event_list);
 544         init_waitqueue_head(&ev_file->poll_wait);
 545         ev_file->uverbs_file = uverbs_file;
 546         ev_file->async_queue = NULL;
 547         ev_file->is_async    = is_async;
 548         ev_file->is_closed   = 0;
 549
 550         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 551                                   ev_file, O_RDONLY);
 552         if (IS_ERR(filp))
 553                 kfree(ev_file);
 554
 555         return filp;
 556 }
 557
 558 /*
 559  * Look up a completion event file by FD.  If lookup is successful,
 560  * takes a ref to the event file struct that it returns; if
 561  * unsuccessful, returns NULL.
 562  */
 563 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 564 {
 565         struct ib_uverbs_event_file *ev_file = NULL;
 566         struct fd f = fdget(fd);
 567
 568         if (!f.file)
 569                 return NULL;
 570
 571         if (f.file->f_op != &uverbs_event_fops)
 572                 goto out;
 573
 574         ev_file = f.file->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         fdput(f);
 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.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 600             !uverbs_cmd_table[hdr.command])
 601                 return -EINVAL;
 602
 603         if (!file->ucontext &&
 604             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 605                 return -EINVAL;
 606
 607         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 608                 return -ENOSYS;
 609
 610 #ifdef CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING
 611         if (hdr.command >= IB_USER_VERBS_CMD_THRESHOLD) {
 612                 struct ib_uverbs_cmd_hdr_ex hdr_ex;
 613
 614                 if (copy_from_user(&hdr_ex, buf, sizeof(hdr_ex)))
 615                         return -EFAULT;
 616
 617                 if (((hdr_ex.in_words + hdr_ex.provider_in_words) * 4) != count)
 618                         return -EINVAL;
 619
 620                 return uverbs_cmd_table[hdr.command](file,
 621                                                      buf + sizeof(hdr_ex),
 622                                                      (hdr_ex.in_words +
 623                                                       hdr_ex.provider_in_words) * 4,
 624                                                      (hdr_ex.out_words +
 625                                                       hdr_ex.provider_out_words) * 4);
 626         } else {
 627 #endif /* CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING */
 628                 if (hdr.in_words * 4 != count)
 629                         return -EINVAL;
 630
 631                 return uverbs_cmd_table[hdr.command](file,
 632                                                      buf + sizeof(hdr),
 633                                                      hdr.in_words * 4,
 634                                                      hdr.out_words * 4);
 635 #ifdef CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING
 636         }
 637 #endif /* CONFIG_INFINIBAND_EXPERIMENTAL_UVERBS_FLOW_STEERING */
 638 }
 639
 640 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 641 {
 642         struct ib_uverbs_file *file = filp->private_data;
 643
 644         if (!file->ucontext)
 645                 return -ENODEV;
 646         else
 647                 return file->device->ib_dev->mmap(file->ucontext, vma);
 648 }
 649
 650 /*
 651  * ib_uverbs_open() does not need the BKL:
 652  *
 653  *  - the ib_uverbs_device structures are properly reference counted and
 654  *    everything else is purely local to the file being created, so
 655  *    races against other open calls are not a problem;
 656  *  - there is no ioctl method to race against;
 657  *  - the open method will either immediately run -ENXIO, or all
 658  *    required initialization will be done.
 659  */
 660 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 661 {
 662         struct ib_uverbs_device *dev;
 663         struct ib_uverbs_file *file;
 664         int ret;
 665
 666         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 667         if (dev)
 668                 kref_get(&dev->ref);
 669         else
 670                 return -ENXIO;
 671
 672         if (!try_module_get(dev->ib_dev->owner)) {
 673                 ret = -ENODEV;
 674                 goto err;
 675         }
 676
 677         file = kmalloc(sizeof *file, GFP_KERNEL);
 678         if (!file) {
 679                 ret = -ENOMEM;
 680                 goto err_module;
 681         }
 682
 683         file->device     = dev;
 684         file->ucontext   = NULL;
 685         file->async_file = NULL;
 686         kref_init(&file->ref);
 687         mutex_init(&file->mutex);
 688
 689         filp->private_data = file;
 690
 691         return nonseekable_open(inode, filp);
 692
 693 err_module:
 694         module_put(dev->ib_dev->owner);
 695
 696 err:
 697         kref_put(&dev->ref, ib_uverbs_release_dev);
 698         return ret;
 699 }
 700
 701 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 702 {
 703         struct ib_uverbs_file *file = filp->private_data;
 704
 705         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 706
 707         if (file->async_file)
 708                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 709
 710         kref_put(&file->ref, ib_uverbs_release_file);
 711
 712         return 0;
 713 }
 714
 715 static const struct file_operations uverbs_fops = {
 716         .owner   = THIS_MODULE,
 717         .write   = ib_uverbs_write,
 718         .open    = ib_uverbs_open,
 719         .release = ib_uverbs_close,
 720         .llseek  = no_llseek,
 721 };
 722
 723 static const struct file_operations uverbs_mmap_fops = {
 724         .owner   = THIS_MODULE,
 725         .write   = ib_uverbs_write,
 726         .mmap    = ib_uverbs_mmap,
 727         .open    = ib_uverbs_open,
 728         .release = ib_uverbs_close,
 729         .llseek  = no_llseek,
 730 };
 731
 732 static struct ib_client uverbs_client = {
 733         .name   = "uverbs",
 734         .add    = ib_uverbs_add_one,
 735         .remove = ib_uverbs_remove_one
 736 };
 737
 738 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 739                           char *buf)
 740 {
 741         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 742
 743         if (!dev)
 744                 return -ENODEV;
 745
 746         return sprintf(buf, "%s\n", dev->ib_dev->name);
 747 }
 748 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 749
 750 static ssize_t show_dev_abi_version(struct device *device,
 751                                     struct device_attribute *attr, char *buf)
 752 {
 753         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 754
 755         if (!dev)
 756                 return -ENODEV;
 757
 758         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 759 }
 760 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 761
 762 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 763                          __stringify(IB_USER_VERBS_ABI_VERSION));
 764
 765 static dev_t overflow_maj;
 766 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
 767
 768 /*
 769  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
 770  * requesting a new major number and doubling the number of max devices we
 771  * support. It's stupid, but simple.
 772  */
 773 static int find_overflow_devnum(void)
 774 {
 775         int ret;
 776
 777         if (!overflow_maj) {
 778                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
 779                                           "infiniband_verbs");
 780                 if (ret) {
 781                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
 782                         return ret;
 783                 }
 784         }
 785
 786         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
 787         if (ret >= IB_UVERBS_MAX_DEVICES)
 788                 return -1;
 789
 790         return ret;
 791 }
 792
 793 static void ib_uverbs_add_one(struct ib_device *device)
 794 {
 795         int devnum;
 796         dev_t base;
 797         struct ib_uverbs_device *uverbs_dev;
 798
 799         if (!device->alloc_ucontext)
 800                 return;
 801
 802         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 803         if (!uverbs_dev)
 804                 return;
 805
 806         kref_init(&uverbs_dev->ref);
 807         init_completion(&uverbs_dev->comp);
 808         uverbs_dev->xrcd_tree = RB_ROOT;
 809         mutex_init(&uverbs_dev->xrcd_tree_mutex);
 810
 811         spin_lock(&map_lock);
 812         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 813         if (devnum >= IB_UVERBS_MAX_DEVICES) {
 814                 spin_unlock(&map_lock);
 815                 devnum = find_overflow_devnum();
 816                 if (devnum < 0)
 817                         goto err;
 818
 819                 spin_lock(&map_lock);
 820                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
 821                 base = devnum + overflow_maj;
 822                 set_bit(devnum, overflow_map);
 823         } else {
 824                 uverbs_dev->devnum = devnum;
 825                 base = devnum + IB_UVERBS_BASE_DEV;
 826                 set_bit(devnum, dev_map);
 827         }
 828         spin_unlock(&map_lock);
 829
 830         uverbs_dev->ib_dev           = device;
 831         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 832
 833         cdev_init(&uverbs_dev->cdev, NULL);
 834         uverbs_dev->cdev.owner = THIS_MODULE;
 835         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 836         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 837         if (cdev_add(&uverbs_dev->cdev, base, 1))
 838                 goto err_cdev;
 839
 840         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 841                                         uverbs_dev->cdev.dev, uverbs_dev,
 842                                         "uverbs%d", uverbs_dev->devnum);
 843         if (IS_ERR(uverbs_dev->dev))
 844                 goto err_cdev;
 845
 846         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 847                 goto err_class;
 848         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 849                 goto err_class;
 850
 851         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 852
 853         return;
 854
 855 err_class:
 856         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 857
 858 err_cdev:
 859         cdev_del(&uverbs_dev->cdev);
 860         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 861                 clear_bit(devnum, dev_map);
 862         else
 863                 clear_bit(devnum, overflow_map);
 864
 865 err:
 866         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 867         wait_for_completion(&uverbs_dev->comp);
 868         kfree(uverbs_dev);
 869         return;
 870 }
 871
 872 static void ib_uverbs_remove_one(struct ib_device *device)
 873 {
 874         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 875
 876         if (!uverbs_dev)
 877                 return;
 878
 879         dev_set_drvdata(uverbs_dev->dev, NULL);
 880         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 881         cdev_del(&uverbs_dev->cdev);
 882
 883         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 884                 clear_bit(uverbs_dev->devnum, dev_map);
 885         else
 886                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
 887
 888         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 889         wait_for_completion(&uverbs_dev->comp);
 890         kfree(uverbs_dev);
 891 }
 892
 893 static char *uverbs_devnode(struct device *dev, umode_t *mode)
 894 {
 895         if (mode)
 896                 *mode = 0666;
 897         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 898 }
 899
 900 static int __init ib_uverbs_init(void)
 901 {
 902         int ret;
 903
 904         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 905                                      "infiniband_verbs");
 906         if (ret) {
 907                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 908                 goto out;
 909         }
 910
 911         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 912         if (IS_ERR(uverbs_class)) {
 913                 ret = PTR_ERR(uverbs_class);
 914                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 915                 goto out_chrdev;
 916         }
 917
 918         uverbs_class->devnode = uverbs_devnode;
 919
 920         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
 921         if (ret) {
 922                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 923                 goto out_class;
 924         }
 925
 926         ret = ib_register_client(&uverbs_client);
 927         if (ret) {
 928                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 929                 goto out_class;
 930         }
 931
 932         return 0;
 933
 934 out_class:
 935         class_destroy(uverbs_class);
 936
 937 out_chrdev:
 938         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 939
 940 out:
 941         return ret;
 942 }
 943
 944 static void __exit ib_uverbs_cleanup(void)
 945 {
 946         ib_unregister_client(&uverbs_client);
 947         class_destroy(uverbs_class);
 948         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 949         if (overflow_maj)
 950                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
 951         idr_destroy(&ib_uverbs_pd_idr);
 952         idr_destroy(&ib_uverbs_mr_idr);
 953         idr_destroy(&ib_uverbs_mw_idr);
 954         idr_destroy(&ib_uverbs_ah_idr);
 955         idr_destroy(&ib_uverbs_cq_idr);
 956         idr_destroy(&ib_uverbs_qp_idr);
 957         idr_destroy(&ib_uverbs_srq_idr);
 958 }
 959
 960 module_init(ib_uverbs_init);
 961 module_exit(ib_uverbs_cleanup);