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
  76 static DEFINE_SPINLOCK(map_lock);
  77 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  78
  79 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  80                                      const char __user *buf, int in_len,
  81                                      int out_len) = {
  82         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  83         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  84         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  85         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  86         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  87         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  88         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  89         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  90         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  91         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  92         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  93         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  94         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  95         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  96         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
  97         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
  98         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
  99         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 100         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 101         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 102         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 103         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 104         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 105         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 106         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 107         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 108         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 109         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 110 };
 111
 112 static void ib_uverbs_add_one(struct ib_device *device);
 113 static void ib_uverbs_remove_one(struct ib_device *device);
 114
 115 static void ib_uverbs_release_dev(struct kref *ref)
 116 {
 117         struct ib_uverbs_device *dev =
 118                 container_of(ref, struct ib_uverbs_device, ref);
 119
 120         complete(&dev->comp);
 121 }
 122
 123 static void ib_uverbs_release_event_file(struct kref *ref)
 124 {
 125         struct ib_uverbs_event_file *file =
 126                 container_of(ref, struct ib_uverbs_event_file, ref);
 127
 128         kfree(file);
 129 }
 130
 131 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 132                           struct ib_uverbs_event_file *ev_file,
 133                           struct ib_ucq_object *uobj)
 134 {
 135         struct ib_uverbs_event *evt, *tmp;
 136
 137         if (ev_file) {
 138                 spin_lock_irq(&ev_file->lock);
 139                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 140                         list_del(&evt->list);
 141                         kfree(evt);
 142                 }
 143                 spin_unlock_irq(&ev_file->lock);
 144
 145                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 146         }
 147
 148         spin_lock_irq(&file->async_file->lock);
 149         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 150                 list_del(&evt->list);
 151                 kfree(evt);
 152         }
 153         spin_unlock_irq(&file->async_file->lock);
 154 }
 155
 156 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 157                               struct ib_uevent_object *uobj)
 158 {
 159         struct ib_uverbs_event *evt, *tmp;
 160
 161         spin_lock_irq(&file->async_file->lock);
 162         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 163                 list_del(&evt->list);
 164                 kfree(evt);
 165         }
 166         spin_unlock_irq(&file->async_file->lock);
 167 }
 168
 169 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 170                                     struct ib_uqp_object *uobj)
 171 {
 172         struct ib_uverbs_mcast_entry *mcast, *tmp;
 173
 174         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 175                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 176                 list_del(&mcast->list);
 177                 kfree(mcast);
 178         }
 179 }
 180
 181 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 182                                       struct ib_ucontext *context)
 183 {
 184         struct ib_uobject *uobj, *tmp;
 185
 186         if (!context)
 187                 return 0;
 188
 189         context->closing = 1;
 190
 191         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 192                 struct ib_ah *ah = uobj->object;
 193
 194                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 195                 ib_destroy_ah(ah);
 196                 kfree(uobj);
 197         }
 198
 199         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 200                 struct ib_qp *qp = uobj->object;
 201                 struct ib_uqp_object *uqp =
 202                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 203
 204                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 205                 ib_uverbs_detach_umcast(qp, uqp);
 206                 ib_destroy_qp(qp);
 207                 ib_uverbs_release_uevent(file, &uqp->uevent);
 208                 kfree(uqp);
 209         }
 210
 211         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 212                 struct ib_cq *cq = uobj->object;
 213                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 214                 struct ib_ucq_object *ucq =
 215                         container_of(uobj, struct ib_ucq_object, uobject);
 216
 217                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 218                 ib_destroy_cq(cq);
 219                 ib_uverbs_release_ucq(file, ev_file, ucq);
 220                 kfree(ucq);
 221         }
 222
 223         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 224                 struct ib_srq *srq = uobj->object;
 225                 struct ib_uevent_object *uevent =
 226                         container_of(uobj, struct ib_uevent_object, uobject);
 227
 228                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 229                 ib_destroy_srq(srq);
 230                 ib_uverbs_release_uevent(file, uevent);
 231                 kfree(uevent);
 232         }
 233
 234         /* XXX Free MWs */
 235
 236         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 237                 struct ib_mr *mr = uobj->object;
 238
 239                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 240                 ib_dereg_mr(mr);
 241                 kfree(uobj);
 242         }
 243
 244         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 245                 struct ib_pd *pd = uobj->object;
 246
 247                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 248                 ib_dealloc_pd(pd);
 249                 kfree(uobj);
 250         }
 251
 252         return context->device->dealloc_ucontext(context);
 253 }
 254
 255 static void ib_uverbs_release_file(struct kref *ref)
 256 {
 257         struct ib_uverbs_file *file =
 258                 container_of(ref, struct ib_uverbs_file, ref);
 259
 260         module_put(file->device->ib_dev->owner);
 261         kref_put(&file->device->ref, ib_uverbs_release_dev);
 262
 263         kfree(file);
 264 }
 265
 266 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 267                                     size_t count, loff_t *pos)
 268 {
 269         struct ib_uverbs_event_file *file = filp->private_data;
 270         struct ib_uverbs_event *event;
 271         int eventsz;
 272         int ret = 0;
 273
 274         spin_lock_irq(&file->lock);
 275
 276         while (list_empty(&file->event_list)) {
 277                 spin_unlock_irq(&file->lock);
 278
 279                 if (filp->f_flags & O_NONBLOCK)
 280                         return -EAGAIN;
 281
 282                 if (wait_event_interruptible(file->poll_wait,
 283                                              !list_empty(&file->event_list)))
 284                         return -ERESTARTSYS;
 285
 286                 spin_lock_irq(&file->lock);
 287         }
 288
 289         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 290
 291         if (file->is_async)
 292                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 293         else
 294                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 295
 296         if (eventsz > count) {
 297                 ret   = -EINVAL;
 298                 event = NULL;
 299         } else {
 300                 list_del(file->event_list.next);
 301                 if (event->counter) {
 302                         ++(*event->counter);
 303                         list_del(&event->obj_list);
 304                 }
 305         }
 306
 307         spin_unlock_irq(&file->lock);
 308
 309         if (event) {
 310                 if (copy_to_user(buf, event, eventsz))
 311                         ret = -EFAULT;
 312                 else
 313                         ret = eventsz;
 314         }
 315
 316         kfree(event);
 317
 318         return ret;
 319 }
 320
 321 static unsigned int ib_uverbs_event_poll(struct file *filp,
 322                                          struct poll_table_struct *wait)
 323 {
 324         unsigned int pollflags = 0;
 325         struct ib_uverbs_event_file *file = filp->private_data;
 326
 327         poll_wait(filp, &file->poll_wait, wait);
 328
 329         spin_lock_irq(&file->lock);
 330         if (!list_empty(&file->event_list))
 331                 pollflags = POLLIN | POLLRDNORM;
 332         spin_unlock_irq(&file->lock);
 333
 334         return pollflags;
 335 }
 336
 337 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 338 {
 339         struct ib_uverbs_event_file *file = filp->private_data;
 340
 341         return fasync_helper(fd, filp, on, &file->async_queue);
 342 }
 343
 344 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 345 {
 346         struct ib_uverbs_event_file *file = filp->private_data;
 347         struct ib_uverbs_event *entry, *tmp;
 348
 349         spin_lock_irq(&file->lock);
 350         file->is_closed = 1;
 351         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 352                 if (entry->counter)
 353                         list_del(&entry->obj_list);
 354                 kfree(entry);
 355         }
 356         spin_unlock_irq(&file->lock);
 357
 358         if (file->is_async) {
 359                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 360                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 361         }
 362         kref_put(&file->ref, ib_uverbs_release_event_file);
 363
 364         return 0;
 365 }
 366
 367 static const struct file_operations uverbs_event_fops = {
 368         .owner   = THIS_MODULE,
 369         .read    = ib_uverbs_event_read,
 370         .poll    = ib_uverbs_event_poll,
 371         .release = ib_uverbs_event_close,
 372         .fasync  = ib_uverbs_event_fasync,
 373         .llseek  = no_llseek,
 374 };
 375
 376 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 377 {
 378         struct ib_uverbs_event_file    *file = cq_context;
 379         struct ib_ucq_object           *uobj;
 380         struct ib_uverbs_event         *entry;
 381         unsigned long                   flags;
 382
 383         if (!file)
 384                 return;
 385
 386         spin_lock_irqsave(&file->lock, flags);
 387         if (file->is_closed) {
 388                 spin_unlock_irqrestore(&file->lock, flags);
 389                 return;
 390         }
 391
 392         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 393         if (!entry) {
 394                 spin_unlock_irqrestore(&file->lock, flags);
 395                 return;
 396         }
 397
 398         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 399
 400         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 401         entry->counter             = &uobj->comp_events_reported;
 402
 403         list_add_tail(&entry->list, &file->event_list);
 404         list_add_tail(&entry->obj_list, &uobj->comp_list);
 405         spin_unlock_irqrestore(&file->lock, flags);
 406
 407         wake_up_interruptible(&file->poll_wait);
 408         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 409 }
 410
 411 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 412                                     __u64 element, __u64 event,
 413                                     struct list_head *obj_list,
 414                                     u32 *counter)
 415 {
 416         struct ib_uverbs_event *entry;
 417         unsigned long flags;
 418
 419         spin_lock_irqsave(&file->async_file->lock, flags);
 420         if (file->async_file->is_closed) {
 421                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 422                 return;
 423         }
 424
 425         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 426         if (!entry) {
 427                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 428                 return;
 429         }
 430
 431         entry->desc.async.element    = element;
 432         entry->desc.async.event_type = event;
 433         entry->counter               = counter;
 434
 435         list_add_tail(&entry->list, &file->async_file->event_list);
 436         if (obj_list)
 437                 list_add_tail(&entry->obj_list, obj_list);
 438         spin_unlock_irqrestore(&file->async_file->lock, flags);
 439
 440         wake_up_interruptible(&file->async_file->poll_wait);
 441         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 442 }
 443
 444 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 445 {
 446         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 447                                                   struct ib_ucq_object, uobject);
 448
 449         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 450                                 event->event, &uobj->async_list,
 451                                 &uobj->async_events_reported);
 452 }
 453
 454 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 455 {
 456         struct ib_uevent_object *uobj;
 457
 458         uobj = container_of(event->element.qp->uobject,
 459                             struct ib_uevent_object, uobject);
 460
 461         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 462                                 event->event, &uobj->event_list,
 463                                 &uobj->events_reported);
 464 }
 465
 466 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 467 {
 468         struct ib_uevent_object *uobj;
 469
 470         uobj = container_of(event->element.srq->uobject,
 471                             struct ib_uevent_object, uobject);
 472
 473         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 474                                 event->event, &uobj->event_list,
 475                                 &uobj->events_reported);
 476 }
 477
 478 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 479                              struct ib_event *event)
 480 {
 481         struct ib_uverbs_file *file =
 482                 container_of(handler, struct ib_uverbs_file, event_handler);
 483
 484         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 485                                 NULL, NULL);
 486 }
 487
 488 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 489                                         int is_async)
 490 {
 491         struct ib_uverbs_event_file *ev_file;
 492         struct file *filp;
 493
 494         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 495         if (!ev_file)
 496                 return ERR_PTR(-ENOMEM);
 497
 498         kref_init(&ev_file->ref);
 499         spin_lock_init(&ev_file->lock);
 500         INIT_LIST_HEAD(&ev_file->event_list);
 501         init_waitqueue_head(&ev_file->poll_wait);
 502         ev_file->uverbs_file = uverbs_file;
 503         ev_file->async_queue = NULL;
 504         ev_file->is_async    = is_async;
 505         ev_file->is_closed   = 0;
 506
 507         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 508                                   ev_file, O_RDONLY);
 509         if (IS_ERR(filp))
 510                 kfree(ev_file);
 511
 512         return filp;
 513 }
 514
 515 /*
 516  * Look up a completion event file by FD.  If lookup is successful,
 517  * takes a ref to the event file struct that it returns; if
 518  * unsuccessful, returns NULL.
 519  */
 520 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 521 {
 522         struct ib_uverbs_event_file *ev_file = NULL;
 523         struct file *filp;
 524
 525         filp = fget(fd);
 526         if (!filp)
 527                 return NULL;
 528
 529         if (filp->f_op != &uverbs_event_fops)
 530                 goto out;
 531
 532         ev_file = filp->private_data;
 533         if (ev_file->is_async) {
 534                 ev_file = NULL;
 535                 goto out;
 536         }
 537
 538         kref_get(&ev_file->ref);
 539
 540 out:
 541         fput(filp);
 542         return ev_file;
 543 }
 544
 545 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 546                              size_t count, loff_t *pos)
 547 {
 548         struct ib_uverbs_file *file = filp->private_data;
 549         struct ib_uverbs_cmd_hdr hdr;
 550
 551         if (count < sizeof hdr)
 552                 return -EINVAL;
 553
 554         if (copy_from_user(&hdr, buf, sizeof hdr))
 555                 return -EFAULT;
 556
 557         if (hdr.in_words * 4 != count)
 558                 return -EINVAL;
 559
 560         if (hdr.command < 0                             ||
 561             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 562             !uverbs_cmd_table[hdr.command])
 563                 return -EINVAL;
 564
 565         if (!file->ucontext &&
 566             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 567                 return -EINVAL;
 568
 569         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 570                 return -ENOSYS;
 571
 572         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 573                                              hdr.in_words * 4, hdr.out_words * 4);
 574 }
 575
 576 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 577 {
 578         struct ib_uverbs_file *file = filp->private_data;
 579
 580         if (!file->ucontext)
 581                 return -ENODEV;
 582         else
 583                 return file->device->ib_dev->mmap(file->ucontext, vma);
 584 }
 585
 586 /*
 587  * ib_uverbs_open() does not need the BKL:
 588  *
 589  *  - the ib_uverbs_device structures are properly reference counted and
 590  *    everything else is purely local to the file being created, so
 591  *    races against other open calls are not a problem;
 592  *  - there is no ioctl method to race against;
 593  *  - the open method will either immediately run -ENXIO, or all
 594  *    required initialization will be done.
 595  */
 596 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 597 {
 598         struct ib_uverbs_device *dev;
 599         struct ib_uverbs_file *file;
 600         int ret;
 601
 602         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 603         if (dev)
 604                 kref_get(&dev->ref);
 605         else
 606                 return -ENXIO;
 607
 608         if (!try_module_get(dev->ib_dev->owner)) {
 609                 ret = -ENODEV;
 610                 goto err;
 611         }
 612
 613         file = kmalloc(sizeof *file, GFP_KERNEL);
 614         if (!file) {
 615                 ret = -ENOMEM;
 616                 goto err_module;
 617         }
 618
 619         file->device     = dev;
 620         file->ucontext   = NULL;
 621         file->async_file = NULL;
 622         kref_init(&file->ref);
 623         mutex_init(&file->mutex);
 624
 625         filp->private_data = file;
 626
 627         return nonseekable_open(inode, filp);
 628
 629 err_module:
 630         module_put(dev->ib_dev->owner);
 631
 632 err:
 633         kref_put(&dev->ref, ib_uverbs_release_dev);
 634         return ret;
 635 }
 636
 637 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 638 {
 639         struct ib_uverbs_file *file = filp->private_data;
 640
 641         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 642
 643         if (file->async_file)
 644                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 645
 646         kref_put(&file->ref, ib_uverbs_release_file);
 647
 648         return 0;
 649 }
 650
 651 static const struct file_operations uverbs_fops = {
 652         .owner   = THIS_MODULE,
 653         .write   = ib_uverbs_write,
 654         .open    = ib_uverbs_open,
 655         .release = ib_uverbs_close,
 656         .llseek  = no_llseek,
 657 };
 658
 659 static const struct file_operations uverbs_mmap_fops = {
 660         .owner   = THIS_MODULE,
 661         .write   = ib_uverbs_write,
 662         .mmap    = ib_uverbs_mmap,
 663         .open    = ib_uverbs_open,
 664         .release = ib_uverbs_close,
 665         .llseek  = no_llseek,
 666 };
 667
 668 static struct ib_client uverbs_client = {
 669         .name   = "uverbs",
 670         .add    = ib_uverbs_add_one,
 671         .remove = ib_uverbs_remove_one
 672 };
 673
 674 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 675                           char *buf)
 676 {
 677         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 678
 679         if (!dev)
 680                 return -ENODEV;
 681
 682         return sprintf(buf, "%s\n", dev->ib_dev->name);
 683 }
 684 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 685
 686 static ssize_t show_dev_abi_version(struct device *device,
 687                                     struct device_attribute *attr, char *buf)
 688 {
 689         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 690
 691         if (!dev)
 692                 return -ENODEV;
 693
 694         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 695 }
 696 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 697
 698 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 699                          __stringify(IB_USER_VERBS_ABI_VERSION));
 700
 701 static dev_t overflow_maj;
 702 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
 703
 704 /*
 705  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
 706  * requesting a new major number and doubling the number of max devices we
 707  * support. It's stupid, but simple.
 708  */
 709 static int find_overflow_devnum(void)
 710 {
 711         int ret;
 712
 713         if (!overflow_maj) {
 714                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
 715                                           "infiniband_verbs");
 716                 if (ret) {
 717                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
 718                         return ret;
 719                 }
 720         }
 721
 722         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
 723         if (ret >= IB_UVERBS_MAX_DEVICES)
 724                 return -1;
 725
 726         return ret;
 727 }
 728
 729 static void ib_uverbs_add_one(struct ib_device *device)
 730 {
 731         int devnum;
 732         dev_t base;
 733         struct ib_uverbs_device *uverbs_dev;
 734
 735         if (!device->alloc_ucontext)
 736                 return;
 737
 738         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 739         if (!uverbs_dev)
 740                 return;
 741
 742         kref_init(&uverbs_dev->ref);
 743         init_completion(&uverbs_dev->comp);
 744
 745         spin_lock(&map_lock);
 746         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 747         if (devnum >= IB_UVERBS_MAX_DEVICES) {
 748                 spin_unlock(&map_lock);
 749                 devnum = find_overflow_devnum();
 750                 if (devnum < 0)
 751                         goto err;
 752
 753                 spin_lock(&map_lock);
 754                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
 755                 base = devnum + overflow_maj;
 756                 set_bit(devnum, overflow_map);
 757         } else {
 758                 uverbs_dev->devnum = devnum;
 759                 base = devnum + IB_UVERBS_BASE_DEV;
 760                 set_bit(devnum, dev_map);
 761         }
 762         spin_unlock(&map_lock);
 763
 764         uverbs_dev->ib_dev           = device;
 765         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 766
 767         cdev_init(&uverbs_dev->cdev, NULL);
 768         uverbs_dev->cdev.owner = THIS_MODULE;
 769         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 770         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 771         if (cdev_add(&uverbs_dev->cdev, base, 1))
 772                 goto err_cdev;
 773
 774         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 775                                         uverbs_dev->cdev.dev, uverbs_dev,
 776                                         "uverbs%d", uverbs_dev->devnum);
 777         if (IS_ERR(uverbs_dev->dev))
 778                 goto err_cdev;
 779
 780         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 781                 goto err_class;
 782         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 783                 goto err_class;
 784
 785         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 786
 787         return;
 788
 789 err_class:
 790         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 791
 792 err_cdev:
 793         cdev_del(&uverbs_dev->cdev);
 794         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 795                 clear_bit(devnum, dev_map);
 796         else
 797                 clear_bit(devnum, overflow_map);
 798
 799 err:
 800         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 801         wait_for_completion(&uverbs_dev->comp);
 802         kfree(uverbs_dev);
 803         return;
 804 }
 805
 806 static void ib_uverbs_remove_one(struct ib_device *device)
 807 {
 808         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 809
 810         if (!uverbs_dev)
 811                 return;
 812
 813         dev_set_drvdata(uverbs_dev->dev, NULL);
 814         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 815         cdev_del(&uverbs_dev->cdev);
 816
 817         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 818                 clear_bit(uverbs_dev->devnum, dev_map);
 819         else
 820                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
 821
 822         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 823         wait_for_completion(&uverbs_dev->comp);
 824         kfree(uverbs_dev);
 825 }
 826
 827 static char *uverbs_devnode(struct device *dev, mode_t *mode)
 828 {
 829         if (mode)
 830                 *mode = 0666;
 831         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 832 }
 833
 834 static int __init ib_uverbs_init(void)
 835 {
 836         int ret;
 837
 838         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 839                                      "infiniband_verbs");
 840         if (ret) {
 841                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 842                 goto out;
 843         }
 844
 845         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 846         if (IS_ERR(uverbs_class)) {
 847                 ret = PTR_ERR(uverbs_class);
 848                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 849                 goto out_chrdev;
 850         }
 851
 852         uverbs_class->devnode = uverbs_devnode;
 853
 854         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
 855         if (ret) {
 856                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 857                 goto out_class;
 858         }
 859
 860         ret = ib_register_client(&uverbs_client);
 861         if (ret) {
 862                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 863                 goto out_class;
 864         }
 865
 866         return 0;
 867
 868 out_class:
 869         class_destroy(uverbs_class);
 870
 871 out_chrdev:
 872         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 873
 874 out:
 875         return ret;
 876 }
 877
 878 static void __exit ib_uverbs_cleanup(void)
 879 {
 880         ib_unregister_client(&uverbs_client);
 881         class_destroy(uverbs_class);
 882         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 883         if (overflow_maj)
 884                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
 885         idr_destroy(&ib_uverbs_pd_idr);
 886         idr_destroy(&ib_uverbs_mr_idr);
 887         idr_destroy(&ib_uverbs_mw_idr);
 888         idr_destroy(&ib_uverbs_ah_idr);
 889         idr_destroy(&ib_uverbs_cq_idr);
 890         idr_destroy(&ib_uverbs_qp_idr);
 891         idr_destroy(&ib_uverbs_srq_idr);
 892 }
 893
 894 module_init(ib_uverbs_init);
 895 module_exit(ib_uverbs_cleanup);