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
  77 static DEFINE_SPINLOCK(map_lock);
  78 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  79
  80 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  81                                      const char __user *buf, int in_len,
  82                                      int out_len) = {
  83         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  84         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  85         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  86         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  87         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  88         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  89         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  90         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  91         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  92         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  93         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  94         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  95         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  96         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  97         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_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_QUERY_SRQ]           = ib_uverbs_query_srq,
 110         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 111         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 112         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 113 };
 114
 115 static void ib_uverbs_add_one(struct ib_device *device);
 116 static void ib_uverbs_remove_one(struct ib_device *device);
 117
 118 static void ib_uverbs_release_dev(struct kref *ref)
 119 {
 120         struct ib_uverbs_device *dev =
 121                 container_of(ref, struct ib_uverbs_device, ref);
 122
 123         complete(&dev->comp);
 124 }
 125
 126 static void ib_uverbs_release_event_file(struct kref *ref)
 127 {
 128         struct ib_uverbs_event_file *file =
 129                 container_of(ref, struct ib_uverbs_event_file, ref);
 130
 131         kfree(file);
 132 }
 133
 134 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 135                           struct ib_uverbs_event_file *ev_file,
 136                           struct ib_ucq_object *uobj)
 137 {
 138         struct ib_uverbs_event *evt, *tmp;
 139
 140         if (ev_file) {
 141                 spin_lock_irq(&ev_file->lock);
 142                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 143                         list_del(&evt->list);
 144                         kfree(evt);
 145                 }
 146                 spin_unlock_irq(&ev_file->lock);
 147
 148                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 149         }
 150
 151         spin_lock_irq(&file->async_file->lock);
 152         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 153                 list_del(&evt->list);
 154                 kfree(evt);
 155         }
 156         spin_unlock_irq(&file->async_file->lock);
 157 }
 158
 159 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 160                               struct ib_uevent_object *uobj)
 161 {
 162         struct ib_uverbs_event *evt, *tmp;
 163
 164         spin_lock_irq(&file->async_file->lock);
 165         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 166                 list_del(&evt->list);
 167                 kfree(evt);
 168         }
 169         spin_unlock_irq(&file->async_file->lock);
 170 }
 171
 172 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 173                                     struct ib_uqp_object *uobj)
 174 {
 175         struct ib_uverbs_mcast_entry *mcast, *tmp;
 176
 177         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 178                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 179                 list_del(&mcast->list);
 180                 kfree(mcast);
 181         }
 182 }
 183
 184 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 185                                       struct ib_ucontext *context)
 186 {
 187         struct ib_uobject *uobj, *tmp;
 188
 189         if (!context)
 190                 return 0;
 191
 192         context->closing = 1;
 193
 194         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 195                 struct ib_ah *ah = uobj->object;
 196
 197                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 198                 ib_destroy_ah(ah);
 199                 kfree(uobj);
 200         }
 201
 202         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 203                 struct ib_qp *qp = uobj->object;
 204                 struct ib_uqp_object *uqp =
 205                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 206
 207                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 208                 ib_uverbs_detach_umcast(qp, uqp);
 209                 ib_destroy_qp(qp);
 210                 ib_uverbs_release_uevent(file, &uqp->uevent);
 211                 kfree(uqp);
 212         }
 213
 214         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 215                 struct ib_cq *cq = uobj->object;
 216                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 217                 struct ib_ucq_object *ucq =
 218                         container_of(uobj, struct ib_ucq_object, uobject);
 219
 220                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 221                 ib_destroy_cq(cq);
 222                 ib_uverbs_release_ucq(file, ev_file, ucq);
 223                 kfree(ucq);
 224         }
 225
 226         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 227                 struct ib_srq *srq = uobj->object;
 228                 struct ib_uevent_object *uevent =
 229                         container_of(uobj, struct ib_uevent_object, uobject);
 230
 231                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 232                 ib_destroy_srq(srq);
 233                 ib_uverbs_release_uevent(file, uevent);
 234                 kfree(uevent);
 235         }
 236
 237         /* XXX Free MWs */
 238
 239         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 240                 struct ib_mr *mr = uobj->object;
 241
 242                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 243                 ib_dereg_mr(mr);
 244                 kfree(uobj);
 245         }
 246
 247         mutex_lock(&file->device->xrcd_tree_mutex);
 248         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 249                 struct ib_xrcd *xrcd = uobj->object;
 250                 struct ib_uxrcd_object *uxrcd =
 251                         container_of(uobj, struct ib_uxrcd_object, uobject);
 252
 253                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 254                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 255                 kfree(uxrcd);
 256         }
 257         mutex_unlock(&file->device->xrcd_tree_mutex);
 258
 259         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 260                 struct ib_pd *pd = uobj->object;
 261
 262                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 263                 ib_dealloc_pd(pd);
 264                 kfree(uobj);
 265         }
 266
 267         return context->device->dealloc_ucontext(context);
 268 }
 269
 270 static void ib_uverbs_release_file(struct kref *ref)
 271 {
 272         struct ib_uverbs_file *file =
 273                 container_of(ref, struct ib_uverbs_file, ref);
 274
 275         module_put(file->device->ib_dev->owner);
 276         kref_put(&file->device->ref, ib_uverbs_release_dev);
 277
 278         kfree(file);
 279 }
 280
 281 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 282                                     size_t count, loff_t *pos)
 283 {
 284         struct ib_uverbs_event_file *file = filp->private_data;
 285         struct ib_uverbs_event *event;
 286         int eventsz;
 287         int ret = 0;
 288
 289         spin_lock_irq(&file->lock);
 290
 291         while (list_empty(&file->event_list)) {
 292                 spin_unlock_irq(&file->lock);
 293
 294                 if (filp->f_flags & O_NONBLOCK)
 295                         return -EAGAIN;
 296
 297                 if (wait_event_interruptible(file->poll_wait,
 298                                              !list_empty(&file->event_list)))
 299                         return -ERESTARTSYS;
 300
 301                 spin_lock_irq(&file->lock);
 302         }
 303
 304         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 305
 306         if (file->is_async)
 307                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 308         else
 309                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 310
 311         if (eventsz > count) {
 312                 ret   = -EINVAL;
 313                 event = NULL;
 314         } else {
 315                 list_del(file->event_list.next);
 316                 if (event->counter) {
 317                         ++(*event->counter);
 318                         list_del(&event->obj_list);
 319                 }
 320         }
 321
 322         spin_unlock_irq(&file->lock);
 323
 324         if (event) {
 325                 if (copy_to_user(buf, event, eventsz))
 326                         ret = -EFAULT;
 327                 else
 328                         ret = eventsz;
 329         }
 330
 331         kfree(event);
 332
 333         return ret;
 334 }
 335
 336 static unsigned int ib_uverbs_event_poll(struct file *filp,
 337                                          struct poll_table_struct *wait)
 338 {
 339         unsigned int pollflags = 0;
 340         struct ib_uverbs_event_file *file = filp->private_data;
 341
 342         poll_wait(filp, &file->poll_wait, wait);
 343
 344         spin_lock_irq(&file->lock);
 345         if (!list_empty(&file->event_list))
 346                 pollflags = POLLIN | POLLRDNORM;
 347         spin_unlock_irq(&file->lock);
 348
 349         return pollflags;
 350 }
 351
 352 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 353 {
 354         struct ib_uverbs_event_file *file = filp->private_data;
 355
 356         return fasync_helper(fd, filp, on, &file->async_queue);
 357 }
 358
 359 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 360 {
 361         struct ib_uverbs_event_file *file = filp->private_data;
 362         struct ib_uverbs_event *entry, *tmp;
 363
 364         spin_lock_irq(&file->lock);
 365         file->is_closed = 1;
 366         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 367                 if (entry->counter)
 368                         list_del(&entry->obj_list);
 369                 kfree(entry);
 370         }
 371         spin_unlock_irq(&file->lock);
 372
 373         if (file->is_async) {
 374                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 375                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 376         }
 377         kref_put(&file->ref, ib_uverbs_release_event_file);
 378
 379         return 0;
 380 }
 381
 382 static const struct file_operations uverbs_event_fops = {
 383         .owner   = THIS_MODULE,
 384         .read    = ib_uverbs_event_read,
 385         .poll    = ib_uverbs_event_poll,
 386         .release = ib_uverbs_event_close,
 387         .fasync  = ib_uverbs_event_fasync,
 388         .llseek  = no_llseek,
 389 };
 390
 391 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 392 {
 393         struct ib_uverbs_event_file    *file = cq_context;
 394         struct ib_ucq_object           *uobj;
 395         struct ib_uverbs_event         *entry;
 396         unsigned long                   flags;
 397
 398         if (!file)
 399                 return;
 400
 401         spin_lock_irqsave(&file->lock, flags);
 402         if (file->is_closed) {
 403                 spin_unlock_irqrestore(&file->lock, flags);
 404                 return;
 405         }
 406
 407         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 408         if (!entry) {
 409                 spin_unlock_irqrestore(&file->lock, flags);
 410                 return;
 411         }
 412
 413         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 414
 415         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 416         entry->counter             = &uobj->comp_events_reported;
 417
 418         list_add_tail(&entry->list, &file->event_list);
 419         list_add_tail(&entry->obj_list, &uobj->comp_list);
 420         spin_unlock_irqrestore(&file->lock, flags);
 421
 422         wake_up_interruptible(&file->poll_wait);
 423         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 424 }
 425
 426 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 427                                     __u64 element, __u64 event,
 428                                     struct list_head *obj_list,
 429                                     u32 *counter)
 430 {
 431         struct ib_uverbs_event *entry;
 432         unsigned long flags;
 433
 434         spin_lock_irqsave(&file->async_file->lock, flags);
 435         if (file->async_file->is_closed) {
 436                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 437                 return;
 438         }
 439
 440         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 441         if (!entry) {
 442                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 443                 return;
 444         }
 445
 446         entry->desc.async.element    = element;
 447         entry->desc.async.event_type = event;
 448         entry->counter               = counter;
 449
 450         list_add_tail(&entry->list, &file->async_file->event_list);
 451         if (obj_list)
 452                 list_add_tail(&entry->obj_list, obj_list);
 453         spin_unlock_irqrestore(&file->async_file->lock, flags);
 454
 455         wake_up_interruptible(&file->async_file->poll_wait);
 456         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 457 }
 458
 459 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 460 {
 461         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 462                                                   struct ib_ucq_object, uobject);
 463
 464         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 465                                 event->event, &uobj->async_list,
 466                                 &uobj->async_events_reported);
 467 }
 468
 469 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 470 {
 471         struct ib_uevent_object *uobj;
 472
 473         uobj = container_of(event->element.qp->uobject,
 474                             struct ib_uevent_object, uobject);
 475
 476         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 477                                 event->event, &uobj->event_list,
 478                                 &uobj->events_reported);
 479 }
 480
 481 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 482 {
 483         struct ib_uevent_object *uobj;
 484
 485         uobj = container_of(event->element.srq->uobject,
 486                             struct ib_uevent_object, uobject);
 487
 488         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 489                                 event->event, &uobj->event_list,
 490                                 &uobj->events_reported);
 491 }
 492
 493 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 494                              struct ib_event *event)
 495 {
 496         struct ib_uverbs_file *file =
 497                 container_of(handler, struct ib_uverbs_file, event_handler);
 498
 499         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 500                                 NULL, NULL);
 501 }
 502
 503 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 504                                         int is_async)
 505 {
 506         struct ib_uverbs_event_file *ev_file;
 507         struct file *filp;
 508
 509         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 510         if (!ev_file)
 511                 return ERR_PTR(-ENOMEM);
 512
 513         kref_init(&ev_file->ref);
 514         spin_lock_init(&ev_file->lock);
 515         INIT_LIST_HEAD(&ev_file->event_list);
 516         init_waitqueue_head(&ev_file->poll_wait);
 517         ev_file->uverbs_file = uverbs_file;
 518         ev_file->async_queue = NULL;
 519         ev_file->is_async    = is_async;
 520         ev_file->is_closed   = 0;
 521
 522         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 523                                   ev_file, O_RDONLY);
 524         if (IS_ERR(filp))
 525                 kfree(ev_file);
 526
 527         return filp;
 528 }
 529
 530 /*
 531  * Look up a completion event file by FD.  If lookup is successful,
 532  * takes a ref to the event file struct that it returns; if
 533  * unsuccessful, returns NULL.
 534  */
 535 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 536 {
 537         struct ib_uverbs_event_file *ev_file = NULL;
 538         struct file *filp;
 539
 540         filp = fget(fd);
 541         if (!filp)
 542                 return NULL;
 543
 544         if (filp->f_op != &uverbs_event_fops)
 545                 goto out;
 546
 547         ev_file = filp->private_data;
 548         if (ev_file->is_async) {
 549                 ev_file = NULL;
 550                 goto out;
 551         }
 552
 553         kref_get(&ev_file->ref);
 554
 555 out:
 556         fput(filp);
 557         return ev_file;
 558 }
 559
 560 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 561                              size_t count, loff_t *pos)
 562 {
 563         struct ib_uverbs_file *file = filp->private_data;
 564         struct ib_uverbs_cmd_hdr hdr;
 565
 566         if (count < sizeof hdr)
 567                 return -EINVAL;
 568
 569         if (copy_from_user(&hdr, buf, sizeof hdr))
 570                 return -EFAULT;
 571
 572         if (hdr.in_words * 4 != count)
 573                 return -EINVAL;
 574
 575         if (hdr.command < 0                             ||
 576             hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 577             !uverbs_cmd_table[hdr.command])
 578                 return -EINVAL;
 579
 580         if (!file->ucontext &&
 581             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 582                 return -EINVAL;
 583
 584         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 585                 return -ENOSYS;
 586
 587         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 588                                              hdr.in_words * 4, hdr.out_words * 4);
 589 }
 590
 591 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 592 {
 593         struct ib_uverbs_file *file = filp->private_data;
 594
 595         if (!file->ucontext)
 596                 return -ENODEV;
 597         else
 598                 return file->device->ib_dev->mmap(file->ucontext, vma);
 599 }
 600
 601 /*
 602  * ib_uverbs_open() does not need the BKL:
 603  *
 604  *  - the ib_uverbs_device structures are properly reference counted and
 605  *    everything else is purely local to the file being created, so
 606  *    races against other open calls are not a problem;
 607  *  - there is no ioctl method to race against;
 608  *  - the open method will either immediately run -ENXIO, or all
 609  *    required initialization will be done.
 610  */
 611 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 612 {
 613         struct ib_uverbs_device *dev;
 614         struct ib_uverbs_file *file;
 615         int ret;
 616
 617         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 618         if (dev)
 619                 kref_get(&dev->ref);
 620         else
 621                 return -ENXIO;
 622
 623         if (!try_module_get(dev->ib_dev->owner)) {
 624                 ret = -ENODEV;
 625                 goto err;
 626         }
 627
 628         file = kmalloc(sizeof *file, GFP_KERNEL);
 629         if (!file) {
 630                 ret = -ENOMEM;
 631                 goto err_module;
 632         }
 633
 634         file->device     = dev;
 635         file->ucontext   = NULL;
 636         file->async_file = NULL;
 637         kref_init(&file->ref);
 638         mutex_init(&file->mutex);
 639
 640         filp->private_data = file;
 641
 642         return nonseekable_open(inode, filp);
 643
 644 err_module:
 645         module_put(dev->ib_dev->owner);
 646
 647 err:
 648         kref_put(&dev->ref, ib_uverbs_release_dev);
 649         return ret;
 650 }
 651
 652 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 653 {
 654         struct ib_uverbs_file *file = filp->private_data;
 655
 656         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 657
 658         if (file->async_file)
 659                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 660
 661         kref_put(&file->ref, ib_uverbs_release_file);
 662
 663         return 0;
 664 }
 665
 666 static const struct file_operations uverbs_fops = {
 667         .owner   = THIS_MODULE,
 668         .write   = ib_uverbs_write,
 669         .open    = ib_uverbs_open,
 670         .release = ib_uverbs_close,
 671         .llseek  = no_llseek,
 672 };
 673
 674 static const struct file_operations uverbs_mmap_fops = {
 675         .owner   = THIS_MODULE,
 676         .write   = ib_uverbs_write,
 677         .mmap    = ib_uverbs_mmap,
 678         .open    = ib_uverbs_open,
 679         .release = ib_uverbs_close,
 680         .llseek  = no_llseek,
 681 };
 682
 683 static struct ib_client uverbs_client = {
 684         .name   = "uverbs",
 685         .add    = ib_uverbs_add_one,
 686         .remove = ib_uverbs_remove_one
 687 };
 688
 689 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 690                           char *buf)
 691 {
 692         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 693
 694         if (!dev)
 695                 return -ENODEV;
 696
 697         return sprintf(buf, "%s\n", dev->ib_dev->name);
 698 }
 699 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 700
 701 static ssize_t show_dev_abi_version(struct device *device,
 702                                     struct device_attribute *attr, char *buf)
 703 {
 704         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 705
 706         if (!dev)
 707                 return -ENODEV;
 708
 709         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 710 }
 711 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 712
 713 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 714                          __stringify(IB_USER_VERBS_ABI_VERSION));
 715
 716 static dev_t overflow_maj;
 717 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
 718
 719 /*
 720  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
 721  * requesting a new major number and doubling the number of max devices we
 722  * support. It's stupid, but simple.
 723  */
 724 static int find_overflow_devnum(void)
 725 {
 726         int ret;
 727
 728         if (!overflow_maj) {
 729                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
 730                                           "infiniband_verbs");
 731                 if (ret) {
 732                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
 733                         return ret;
 734                 }
 735         }
 736
 737         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
 738         if (ret >= IB_UVERBS_MAX_DEVICES)
 739                 return -1;
 740
 741         return ret;
 742 }
 743
 744 static void ib_uverbs_add_one(struct ib_device *device)
 745 {
 746         int devnum;
 747         dev_t base;
 748         struct ib_uverbs_device *uverbs_dev;
 749
 750         if (!device->alloc_ucontext)
 751                 return;
 752
 753         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 754         if (!uverbs_dev)
 755                 return;
 756
 757         kref_init(&uverbs_dev->ref);
 758         init_completion(&uverbs_dev->comp);
 759         uverbs_dev->xrcd_tree = RB_ROOT;
 760         mutex_init(&uverbs_dev->xrcd_tree_mutex);
 761
 762         spin_lock(&map_lock);
 763         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 764         if (devnum >= IB_UVERBS_MAX_DEVICES) {
 765                 spin_unlock(&map_lock);
 766                 devnum = find_overflow_devnum();
 767                 if (devnum < 0)
 768                         goto err;
 769
 770                 spin_lock(&map_lock);
 771                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
 772                 base = devnum + overflow_maj;
 773                 set_bit(devnum, overflow_map);
 774         } else {
 775                 uverbs_dev->devnum = devnum;
 776                 base = devnum + IB_UVERBS_BASE_DEV;
 777                 set_bit(devnum, dev_map);
 778         }
 779         spin_unlock(&map_lock);
 780
 781         uverbs_dev->ib_dev           = device;
 782         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 783
 784         cdev_init(&uverbs_dev->cdev, NULL);
 785         uverbs_dev->cdev.owner = THIS_MODULE;
 786         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 787         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 788         if (cdev_add(&uverbs_dev->cdev, base, 1))
 789                 goto err_cdev;
 790
 791         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 792                                         uverbs_dev->cdev.dev, uverbs_dev,
 793                                         "uverbs%d", uverbs_dev->devnum);
 794         if (IS_ERR(uverbs_dev->dev))
 795                 goto err_cdev;
 796
 797         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 798                 goto err_class;
 799         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 800                 goto err_class;
 801
 802         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 803
 804         return;
 805
 806 err_class:
 807         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 808
 809 err_cdev:
 810         cdev_del(&uverbs_dev->cdev);
 811         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 812                 clear_bit(devnum, dev_map);
 813         else
 814                 clear_bit(devnum, overflow_map);
 815
 816 err:
 817         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 818         wait_for_completion(&uverbs_dev->comp);
 819         kfree(uverbs_dev);
 820         return;
 821 }
 822
 823 static void ib_uverbs_remove_one(struct ib_device *device)
 824 {
 825         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 826
 827         if (!uverbs_dev)
 828                 return;
 829
 830         dev_set_drvdata(uverbs_dev->dev, NULL);
 831         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 832         cdev_del(&uverbs_dev->cdev);
 833
 834         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 835                 clear_bit(uverbs_dev->devnum, dev_map);
 836         else
 837                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
 838
 839         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 840         wait_for_completion(&uverbs_dev->comp);
 841         kfree(uverbs_dev);
 842 }
 843
 844 static char *uverbs_devnode(struct device *dev, mode_t *mode)
 845 {
 846         if (mode)
 847                 *mode = 0666;
 848         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 849 }
 850
 851 static int __init ib_uverbs_init(void)
 852 {
 853         int ret;
 854
 855         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 856                                      "infiniband_verbs");
 857         if (ret) {
 858                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 859                 goto out;
 860         }
 861
 862         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 863         if (IS_ERR(uverbs_class)) {
 864                 ret = PTR_ERR(uverbs_class);
 865                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 866                 goto out_chrdev;
 867         }
 868
 869         uverbs_class->devnode = uverbs_devnode;
 870
 871         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
 872         if (ret) {
 873                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 874                 goto out_class;
 875         }
 876
 877         ret = ib_register_client(&uverbs_client);
 878         if (ret) {
 879                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 880                 goto out_class;
 881         }
 882
 883         return 0;
 884
 885 out_class:
 886         class_destroy(uverbs_class);
 887
 888 out_chrdev:
 889         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 890
 891 out:
 892         return ret;
 893 }
 894
 895 static void __exit ib_uverbs_cleanup(void)
 896 {
 897         ib_unregister_client(&uverbs_client);
 898         class_destroy(uverbs_class);
 899         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 900         if (overflow_maj)
 901                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
 902         idr_destroy(&ib_uverbs_pd_idr);
 903         idr_destroy(&ib_uverbs_mr_idr);
 904         idr_destroy(&ib_uverbs_mw_idr);
 905         idr_destroy(&ib_uverbs_ah_idr);
 906         idr_destroy(&ib_uverbs_cq_idr);
 907         idr_destroy(&ib_uverbs_qp_idr);
 908         idr_destroy(&ib_uverbs_srq_idr);
 909 }
 910
 911 module_init(ib_uverbs_init);
 912 module_exit(ib_uverbs_cleanup);