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_ALLOC_MW]            = ib_uverbs_alloc_mw,
  91         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  92         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
  93         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
  94         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
  95         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
  96         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
  97         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
  98         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
  99         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 100         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 101         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 102         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 103         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 104         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 105         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 106         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 107         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 108         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 109         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 110         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 111         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 112         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 113         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 114         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 115         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 116         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp
 117 };
 118
 119 static void ib_uverbs_add_one(struct ib_device *device);
 120 static void ib_uverbs_remove_one(struct ib_device *device);
 121
 122 static void ib_uverbs_release_dev(struct kref *ref)
 123 {
 124         struct ib_uverbs_device *dev =
 125                 container_of(ref, struct ib_uverbs_device, ref);
 126
 127         complete(&dev->comp);
 128 }
 129
 130 static void ib_uverbs_release_event_file(struct kref *ref)
 131 {
 132         struct ib_uverbs_event_file *file =
 133                 container_of(ref, struct ib_uverbs_event_file, ref);
 134
 135         kfree(file);
 136 }
 137
 138 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 139                           struct ib_uverbs_event_file *ev_file,
 140                           struct ib_ucq_object *uobj)
 141 {
 142         struct ib_uverbs_event *evt, *tmp;
 143
 144         if (ev_file) {
 145                 spin_lock_irq(&ev_file->lock);
 146                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 147                         list_del(&evt->list);
 148                         kfree(evt);
 149                 }
 150                 spin_unlock_irq(&ev_file->lock);
 151
 152                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 153         }
 154
 155         spin_lock_irq(&file->async_file->lock);
 156         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 157                 list_del(&evt->list);
 158                 kfree(evt);
 159         }
 160         spin_unlock_irq(&file->async_file->lock);
 161 }
 162
 163 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 164                               struct ib_uevent_object *uobj)
 165 {
 166         struct ib_uverbs_event *evt, *tmp;
 167
 168         spin_lock_irq(&file->async_file->lock);
 169         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 170                 list_del(&evt->list);
 171                 kfree(evt);
 172         }
 173         spin_unlock_irq(&file->async_file->lock);
 174 }
 175
 176 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 177                                     struct ib_uqp_object *uobj)
 178 {
 179         struct ib_uverbs_mcast_entry *mcast, *tmp;
 180
 181         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 182                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 183                 list_del(&mcast->list);
 184                 kfree(mcast);
 185         }
 186 }
 187
 188 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 189                                       struct ib_ucontext *context)
 190 {
 191         struct ib_uobject *uobj, *tmp;
 192
 193         if (!context)
 194                 return 0;
 195
 196         context->closing = 1;
 197
 198         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 199                 struct ib_ah *ah = uobj->object;
 200
 201                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 202                 ib_destroy_ah(ah);
 203                 kfree(uobj);
 204         }
 205
 206         /* Remove MWs before QPs, in order to support type 2A MWs. */
 207         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 208                 struct ib_mw *mw = uobj->object;
 209
 210                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 211                 ib_dealloc_mw(mw);
 212                 kfree(uobj);
 213         }
 214
 215         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 216                 struct ib_qp *qp = uobj->object;
 217                 struct ib_uqp_object *uqp =
 218                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 219
 220                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 221                 if (qp != qp->real_qp) {
 222                         ib_close_qp(qp);
 223                 } else {
 224                         ib_uverbs_detach_umcast(qp, uqp);
 225                         ib_destroy_qp(qp);
 226                 }
 227                 ib_uverbs_release_uevent(file, &uqp->uevent);
 228                 kfree(uqp);
 229         }
 230
 231         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 232                 struct ib_cq *cq = uobj->object;
 233                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 234                 struct ib_ucq_object *ucq =
 235                         container_of(uobj, struct ib_ucq_object, uobject);
 236
 237                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 238                 ib_destroy_cq(cq);
 239                 ib_uverbs_release_ucq(file, ev_file, ucq);
 240                 kfree(ucq);
 241         }
 242
 243         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 244                 struct ib_srq *srq = uobj->object;
 245                 struct ib_uevent_object *uevent =
 246                         container_of(uobj, struct ib_uevent_object, uobject);
 247
 248                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 249                 ib_destroy_srq(srq);
 250                 ib_uverbs_release_uevent(file, uevent);
 251                 kfree(uevent);
 252         }
 253
 254         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 255                 struct ib_mr *mr = uobj->object;
 256
 257                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 258                 ib_dereg_mr(mr);
 259                 kfree(uobj);
 260         }
 261
 262         mutex_lock(&file->device->xrcd_tree_mutex);
 263         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 264                 struct ib_xrcd *xrcd = uobj->object;
 265                 struct ib_uxrcd_object *uxrcd =
 266                         container_of(uobj, struct ib_uxrcd_object, uobject);
 267
 268                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 269                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 270                 kfree(uxrcd);
 271         }
 272         mutex_unlock(&file->device->xrcd_tree_mutex);
 273
 274         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 275                 struct ib_pd *pd = uobj->object;
 276
 277                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 278                 ib_dealloc_pd(pd);
 279                 kfree(uobj);
 280         }
 281
 282         return context->device->dealloc_ucontext(context);
 283 }
 284
 285 static void ib_uverbs_release_file(struct kref *ref)
 286 {
 287         struct ib_uverbs_file *file =
 288                 container_of(ref, struct ib_uverbs_file, ref);
 289
 290         module_put(file->device->ib_dev->owner);
 291         kref_put(&file->device->ref, ib_uverbs_release_dev);
 292
 293         kfree(file);
 294 }
 295
 296 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 297                                     size_t count, loff_t *pos)
 298 {
 299         struct ib_uverbs_event_file *file = filp->private_data;
 300         struct ib_uverbs_event *event;
 301         int eventsz;
 302         int ret = 0;
 303
 304         spin_lock_irq(&file->lock);
 305
 306         while (list_empty(&file->event_list)) {
 307                 spin_unlock_irq(&file->lock);
 308
 309                 if (filp->f_flags & O_NONBLOCK)
 310                         return -EAGAIN;
 311
 312                 if (wait_event_interruptible(file->poll_wait,
 313                                              !list_empty(&file->event_list)))
 314                         return -ERESTARTSYS;
 315
 316                 spin_lock_irq(&file->lock);
 317         }
 318
 319         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 320
 321         if (file->is_async)
 322                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 323         else
 324                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 325
 326         if (eventsz > count) {
 327                 ret   = -EINVAL;
 328                 event = NULL;
 329         } else {
 330                 list_del(file->event_list.next);
 331                 if (event->counter) {
 332                         ++(*event->counter);
 333                         list_del(&event->obj_list);
 334                 }
 335         }
 336
 337         spin_unlock_irq(&file->lock);
 338
 339         if (event) {
 340                 if (copy_to_user(buf, event, eventsz))
 341                         ret = -EFAULT;
 342                 else
 343                         ret = eventsz;
 344         }
 345
 346         kfree(event);
 347
 348         return ret;
 349 }
 350
 351 static unsigned int ib_uverbs_event_poll(struct file *filp,
 352                                          struct poll_table_struct *wait)
 353 {
 354         unsigned int pollflags = 0;
 355         struct ib_uverbs_event_file *file = filp->private_data;
 356
 357         poll_wait(filp, &file->poll_wait, wait);
 358
 359         spin_lock_irq(&file->lock);
 360         if (!list_empty(&file->event_list))
 361                 pollflags = POLLIN | POLLRDNORM;
 362         spin_unlock_irq(&file->lock);
 363
 364         return pollflags;
 365 }
 366
 367 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 368 {
 369         struct ib_uverbs_event_file *file = filp->private_data;
 370
 371         return fasync_helper(fd, filp, on, &file->async_queue);
 372 }
 373
 374 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 375 {
 376         struct ib_uverbs_event_file *file = filp->private_data;
 377         struct ib_uverbs_event *entry, *tmp;
 378
 379         spin_lock_irq(&file->lock);
 380         file->is_closed = 1;
 381         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 382                 if (entry->counter)
 383                         list_del(&entry->obj_list);
 384                 kfree(entry);
 385         }
 386         spin_unlock_irq(&file->lock);
 387
 388         if (file->is_async) {
 389                 ib_unregister_event_handler(&file->uverbs_file->event_handler);
 390                 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 391         }
 392         kref_put(&file->ref, ib_uverbs_release_event_file);
 393
 394         return 0;
 395 }
 396
 397 static const struct file_operations uverbs_event_fops = {
 398         .owner   = THIS_MODULE,
 399         .read    = ib_uverbs_event_read,
 400         .poll    = ib_uverbs_event_poll,
 401         .release = ib_uverbs_event_close,
 402         .fasync  = ib_uverbs_event_fasync,
 403         .llseek  = no_llseek,
 404 };
 405
 406 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 407 {
 408         struct ib_uverbs_event_file    *file = cq_context;
 409         struct ib_ucq_object           *uobj;
 410         struct ib_uverbs_event         *entry;
 411         unsigned long                   flags;
 412
 413         if (!file)
 414                 return;
 415
 416         spin_lock_irqsave(&file->lock, flags);
 417         if (file->is_closed) {
 418                 spin_unlock_irqrestore(&file->lock, flags);
 419                 return;
 420         }
 421
 422         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 423         if (!entry) {
 424                 spin_unlock_irqrestore(&file->lock, flags);
 425                 return;
 426         }
 427
 428         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 429
 430         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 431         entry->counter             = &uobj->comp_events_reported;
 432
 433         list_add_tail(&entry->list, &file->event_list);
 434         list_add_tail(&entry->obj_list, &uobj->comp_list);
 435         spin_unlock_irqrestore(&file->lock, flags);
 436
 437         wake_up_interruptible(&file->poll_wait);
 438         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 439 }
 440
 441 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 442                                     __u64 element, __u64 event,
 443                                     struct list_head *obj_list,
 444                                     u32 *counter)
 445 {
 446         struct ib_uverbs_event *entry;
 447         unsigned long flags;
 448
 449         spin_lock_irqsave(&file->async_file->lock, flags);
 450         if (file->async_file->is_closed) {
 451                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 452                 return;
 453         }
 454
 455         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 456         if (!entry) {
 457                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 458                 return;
 459         }
 460
 461         entry->desc.async.element    = element;
 462         entry->desc.async.event_type = event;
 463         entry->counter               = counter;
 464
 465         list_add_tail(&entry->list, &file->async_file->event_list);
 466         if (obj_list)
 467                 list_add_tail(&entry->obj_list, obj_list);
 468         spin_unlock_irqrestore(&file->async_file->lock, flags);
 469
 470         wake_up_interruptible(&file->async_file->poll_wait);
 471         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 472 }
 473
 474 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 475 {
 476         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 477                                                   struct ib_ucq_object, uobject);
 478
 479         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 480                                 event->event, &uobj->async_list,
 481                                 &uobj->async_events_reported);
 482 }
 483
 484 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 485 {
 486         struct ib_uevent_object *uobj;
 487
 488         uobj = container_of(event->element.qp->uobject,
 489                             struct ib_uevent_object, uobject);
 490
 491         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 492                                 event->event, &uobj->event_list,
 493                                 &uobj->events_reported);
 494 }
 495
 496 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 497 {
 498         struct ib_uevent_object *uobj;
 499
 500         uobj = container_of(event->element.srq->uobject,
 501                             struct ib_uevent_object, uobject);
 502
 503         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 504                                 event->event, &uobj->event_list,
 505                                 &uobj->events_reported);
 506 }
 507
 508 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 509                              struct ib_event *event)
 510 {
 511         struct ib_uverbs_file *file =
 512                 container_of(handler, struct ib_uverbs_file, event_handler);
 513
 514         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 515                                 NULL, NULL);
 516 }
 517
 518 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 519                                         int is_async)
 520 {
 521         struct ib_uverbs_event_file *ev_file;
 522         struct file *filp;
 523
 524         ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL);
 525         if (!ev_file)
 526                 return ERR_PTR(-ENOMEM);
 527
 528         kref_init(&ev_file->ref);
 529         spin_lock_init(&ev_file->lock);
 530         INIT_LIST_HEAD(&ev_file->event_list);
 531         init_waitqueue_head(&ev_file->poll_wait);
 532         ev_file->uverbs_file = uverbs_file;
 533         ev_file->async_queue = NULL;
 534         ev_file->is_async    = is_async;
 535         ev_file->is_closed   = 0;
 536
 537         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 538                                   ev_file, O_RDONLY);
 539         if (IS_ERR(filp))
 540                 kfree(ev_file);
 541
 542         return filp;
 543 }
 544
 545 /*
 546  * Look up a completion event file by FD.  If lookup is successful,
 547  * takes a ref to the event file struct that it returns; if
 548  * unsuccessful, returns NULL.
 549  */
 550 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 551 {
 552         struct ib_uverbs_event_file *ev_file = NULL;
 553         struct fd f = fdget(fd);
 554
 555         if (!f.file)
 556                 return NULL;
 557
 558         if (f.file->f_op != &uverbs_event_fops)
 559                 goto out;
 560
 561         ev_file = f.file->private_data;
 562         if (ev_file->is_async) {
 563                 ev_file = NULL;
 564                 goto out;
 565         }
 566
 567         kref_get(&ev_file->ref);
 568
 569 out:
 570         fdput(f);
 571         return ev_file;
 572 }
 573
 574 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 575                              size_t count, loff_t *pos)
 576 {
 577         struct ib_uverbs_file *file = filp->private_data;
 578         struct ib_uverbs_cmd_hdr hdr;
 579
 580         if (count < sizeof hdr)
 581                 return -EINVAL;
 582
 583         if (copy_from_user(&hdr, buf, sizeof hdr))
 584                 return -EFAULT;
 585
 586         if (hdr.in_words * 4 != count)
 587                 return -EINVAL;
 588
 589         if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) ||
 590             !uverbs_cmd_table[hdr.command])
 591                 return -EINVAL;
 592
 593         if (!file->ucontext &&
 594             hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT)
 595                 return -EINVAL;
 596
 597         if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command)))
 598                 return -ENOSYS;
 599
 600         return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr,
 601                                              hdr.in_words * 4, hdr.out_words * 4);
 602 }
 603
 604 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 605 {
 606         struct ib_uverbs_file *file = filp->private_data;
 607
 608         if (!file->ucontext)
 609                 return -ENODEV;
 610         else
 611                 return file->device->ib_dev->mmap(file->ucontext, vma);
 612 }
 613
 614 /*
 615  * ib_uverbs_open() does not need the BKL:
 616  *
 617  *  - the ib_uverbs_device structures are properly reference counted and
 618  *    everything else is purely local to the file being created, so
 619  *    races against other open calls are not a problem;
 620  *  - there is no ioctl method to race against;
 621  *  - the open method will either immediately run -ENXIO, or all
 622  *    required initialization will be done.
 623  */
 624 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 625 {
 626         struct ib_uverbs_device *dev;
 627         struct ib_uverbs_file *file;
 628         int ret;
 629
 630         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 631         if (dev)
 632                 kref_get(&dev->ref);
 633         else
 634                 return -ENXIO;
 635
 636         if (!try_module_get(dev->ib_dev->owner)) {
 637                 ret = -ENODEV;
 638                 goto err;
 639         }
 640
 641         file = kmalloc(sizeof *file, GFP_KERNEL);
 642         if (!file) {
 643                 ret = -ENOMEM;
 644                 goto err_module;
 645         }
 646
 647         file->device     = dev;
 648         file->ucontext   = NULL;
 649         file->async_file = NULL;
 650         kref_init(&file->ref);
 651         mutex_init(&file->mutex);
 652
 653         filp->private_data = file;
 654
 655         return nonseekable_open(inode, filp);
 656
 657 err_module:
 658         module_put(dev->ib_dev->owner);
 659
 660 err:
 661         kref_put(&dev->ref, ib_uverbs_release_dev);
 662         return ret;
 663 }
 664
 665 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 666 {
 667         struct ib_uverbs_file *file = filp->private_data;
 668
 669         ib_uverbs_cleanup_ucontext(file, file->ucontext);
 670
 671         if (file->async_file)
 672                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 673
 674         kref_put(&file->ref, ib_uverbs_release_file);
 675
 676         return 0;
 677 }
 678
 679 static const struct file_operations uverbs_fops = {
 680         .owner   = THIS_MODULE,
 681         .write   = ib_uverbs_write,
 682         .open    = ib_uverbs_open,
 683         .release = ib_uverbs_close,
 684         .llseek  = no_llseek,
 685 };
 686
 687 static const struct file_operations uverbs_mmap_fops = {
 688         .owner   = THIS_MODULE,
 689         .write   = ib_uverbs_write,
 690         .mmap    = ib_uverbs_mmap,
 691         .open    = ib_uverbs_open,
 692         .release = ib_uverbs_close,
 693         .llseek  = no_llseek,
 694 };
 695
 696 static struct ib_client uverbs_client = {
 697         .name   = "uverbs",
 698         .add    = ib_uverbs_add_one,
 699         .remove = ib_uverbs_remove_one
 700 };
 701
 702 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 703                           char *buf)
 704 {
 705         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 706
 707         if (!dev)
 708                 return -ENODEV;
 709
 710         return sprintf(buf, "%s\n", dev->ib_dev->name);
 711 }
 712 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 713
 714 static ssize_t show_dev_abi_version(struct device *device,
 715                                     struct device_attribute *attr, char *buf)
 716 {
 717         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 718
 719         if (!dev)
 720                 return -ENODEV;
 721
 722         return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver);
 723 }
 724 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
 725
 726 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
 727                          __stringify(IB_USER_VERBS_ABI_VERSION));
 728
 729 static dev_t overflow_maj;
 730 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
 731
 732 /*
 733  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
 734  * requesting a new major number and doubling the number of max devices we
 735  * support. It's stupid, but simple.
 736  */
 737 static int find_overflow_devnum(void)
 738 {
 739         int ret;
 740
 741         if (!overflow_maj) {
 742                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
 743                                           "infiniband_verbs");
 744                 if (ret) {
 745                         printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n");
 746                         return ret;
 747                 }
 748         }
 749
 750         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
 751         if (ret >= IB_UVERBS_MAX_DEVICES)
 752                 return -1;
 753
 754         return ret;
 755 }
 756
 757 static void ib_uverbs_add_one(struct ib_device *device)
 758 {
 759         int devnum;
 760         dev_t base;
 761         struct ib_uverbs_device *uverbs_dev;
 762
 763         if (!device->alloc_ucontext)
 764                 return;
 765
 766         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
 767         if (!uverbs_dev)
 768                 return;
 769
 770         kref_init(&uverbs_dev->ref);
 771         init_completion(&uverbs_dev->comp);
 772         uverbs_dev->xrcd_tree = RB_ROOT;
 773         mutex_init(&uverbs_dev->xrcd_tree_mutex);
 774
 775         spin_lock(&map_lock);
 776         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
 777         if (devnum >= IB_UVERBS_MAX_DEVICES) {
 778                 spin_unlock(&map_lock);
 779                 devnum = find_overflow_devnum();
 780                 if (devnum < 0)
 781                         goto err;
 782
 783                 spin_lock(&map_lock);
 784                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
 785                 base = devnum + overflow_maj;
 786                 set_bit(devnum, overflow_map);
 787         } else {
 788                 uverbs_dev->devnum = devnum;
 789                 base = devnum + IB_UVERBS_BASE_DEV;
 790                 set_bit(devnum, dev_map);
 791         }
 792         spin_unlock(&map_lock);
 793
 794         uverbs_dev->ib_dev           = device;
 795         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
 796
 797         cdev_init(&uverbs_dev->cdev, NULL);
 798         uverbs_dev->cdev.owner = THIS_MODULE;
 799         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
 800         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
 801         if (cdev_add(&uverbs_dev->cdev, base, 1))
 802                 goto err_cdev;
 803
 804         uverbs_dev->dev = device_create(uverbs_class, device->dma_device,
 805                                         uverbs_dev->cdev.dev, uverbs_dev,
 806                                         "uverbs%d", uverbs_dev->devnum);
 807         if (IS_ERR(uverbs_dev->dev))
 808                 goto err_cdev;
 809
 810         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
 811                 goto err_class;
 812         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
 813                 goto err_class;
 814
 815         ib_set_client_data(device, &uverbs_client, uverbs_dev);
 816
 817         return;
 818
 819 err_class:
 820         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 821
 822 err_cdev:
 823         cdev_del(&uverbs_dev->cdev);
 824         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 825                 clear_bit(devnum, dev_map);
 826         else
 827                 clear_bit(devnum, overflow_map);
 828
 829 err:
 830         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 831         wait_for_completion(&uverbs_dev->comp);
 832         kfree(uverbs_dev);
 833         return;
 834 }
 835
 836 static void ib_uverbs_remove_one(struct ib_device *device)
 837 {
 838         struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client);
 839
 840         if (!uverbs_dev)
 841                 return;
 842
 843         dev_set_drvdata(uverbs_dev->dev, NULL);
 844         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
 845         cdev_del(&uverbs_dev->cdev);
 846
 847         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
 848                 clear_bit(uverbs_dev->devnum, dev_map);
 849         else
 850                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
 851
 852         kref_put(&uverbs_dev->ref, ib_uverbs_release_dev);
 853         wait_for_completion(&uverbs_dev->comp);
 854         kfree(uverbs_dev);
 855 }
 856
 857 static char *uverbs_devnode(struct device *dev, umode_t *mode)
 858 {
 859         if (mode)
 860                 *mode = 0666;
 861         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
 862 }
 863
 864 static int __init ib_uverbs_init(void)
 865 {
 866         int ret;
 867
 868         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
 869                                      "infiniband_verbs");
 870         if (ret) {
 871                 printk(KERN_ERR "user_verbs: couldn't register device number\n");
 872                 goto out;
 873         }
 874
 875         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
 876         if (IS_ERR(uverbs_class)) {
 877                 ret = PTR_ERR(uverbs_class);
 878                 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n");
 879                 goto out_chrdev;
 880         }
 881
 882         uverbs_class->devnode = uverbs_devnode;
 883
 884         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
 885         if (ret) {
 886                 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n");
 887                 goto out_class;
 888         }
 889
 890         ret = ib_register_client(&uverbs_client);
 891         if (ret) {
 892                 printk(KERN_ERR "user_verbs: couldn't register client\n");
 893                 goto out_class;
 894         }
 895
 896         return 0;
 897
 898 out_class:
 899         class_destroy(uverbs_class);
 900
 901 out_chrdev:
 902         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 903
 904 out:
 905         return ret;
 906 }
 907
 908 static void __exit ib_uverbs_cleanup(void)
 909 {
 910         ib_unregister_client(&uverbs_client);
 911         class_destroy(uverbs_class);
 912         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
 913         if (overflow_maj)
 914                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
 915         idr_destroy(&ib_uverbs_pd_idr);
 916         idr_destroy(&ib_uverbs_mr_idr);
 917         idr_destroy(&ib_uverbs_mw_idr);
 918         idr_destroy(&ib_uverbs_ah_idr);
 919         idr_destroy(&ib_uverbs_cq_idr);
 920         idr_destroy(&ib_uverbs_qp_idr);
 921         idr_destroy(&ib_uverbs_srq_idr);
 922 }
 923
 924 module_init(ib_uverbs_init);
 925 module_exit(ib_uverbs_cleanup);