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 <linux/uaccess.h>
  50
  51 #include <rdma/ib.h>
  52 #include <rdma/uverbs_std_types.h>
  53
  54 #include "uverbs.h"
  55 #include "core_priv.h"
  56 #include "rdma_core.h"
  57
  58 MODULE_AUTHOR("Roland Dreier");
  59 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  60 MODULE_LICENSE("Dual BSD/GPL");
  61
  62 enum {
  63         IB_UVERBS_MAJOR       = 231,
  64         IB_UVERBS_BASE_MINOR  = 192,
  65         IB_UVERBS_MAX_DEVICES = 32
  66 };
  67
  68 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  69
  70 static struct class *uverbs_class;
  71
  72 static DEFINE_SPINLOCK(map_lock);
  73 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  74
  75 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  76                                      struct ib_device *ib_dev,
  77                                      const char __user *buf, int in_len,
  78                                      int out_len) = {
  79         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  80         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  81         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  82         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  83         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  84         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  85         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  86         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  87         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  88         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
  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         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 111         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 112         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 113         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 114 };
 115
 116 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 117                                     struct ib_device *ib_dev,
 118                                     struct ib_udata *ucore,
 119                                     struct ib_udata *uhw) = {
 120         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 121         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 122         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 123         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 124         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 125         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
 126         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
 127         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
 128         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
 129         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
 130         [IB_USER_VERBS_EX_CMD_MODIFY_QP]        = ib_uverbs_ex_modify_qp,
 131 };
 132
 133 static void ib_uverbs_add_one(struct ib_device *device);
 134 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 135
 136 int uverbs_dealloc_mw(struct ib_mw *mw)
 137 {
 138         struct ib_pd *pd = mw->pd;
 139         int ret;
 140
 141         ret = mw->device->dealloc_mw(mw);
 142         if (!ret)
 143                 atomic_dec(&pd->usecnt);
 144         return ret;
 145 }
 146
 147 static void ib_uverbs_release_dev(struct kobject *kobj)
 148 {
 149         struct ib_uverbs_device *dev =
 150                 container_of(kobj, struct ib_uverbs_device, kobj);
 151
 152         cleanup_srcu_struct(&dev->disassociate_srcu);
 153         kfree(dev);
 154 }
 155
 156 static struct kobj_type ib_uverbs_dev_ktype = {
 157         .release = ib_uverbs_release_dev,
 158 };
 159
 160 static void ib_uverbs_release_async_event_file(struct kref *ref)
 161 {
 162         struct ib_uverbs_async_event_file *file =
 163                 container_of(ref, struct ib_uverbs_async_event_file, ref);
 164
 165         kfree(file);
 166 }
 167
 168 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 169                           struct ib_uverbs_completion_event_file *ev_file,
 170                           struct ib_ucq_object *uobj)
 171 {
 172         struct ib_uverbs_event *evt, *tmp;
 173
 174         if (ev_file) {
 175                 spin_lock_irq(&ev_file->ev_queue.lock);
 176                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 177                         list_del(&evt->list);
 178                         kfree(evt);
 179                 }
 180                 spin_unlock_irq(&ev_file->ev_queue.lock);
 181
 182                 uverbs_uobject_put(&ev_file->uobj_file.uobj);
 183         }
 184
 185         spin_lock_irq(&file->async_file->ev_queue.lock);
 186         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 187                 list_del(&evt->list);
 188                 kfree(evt);
 189         }
 190         spin_unlock_irq(&file->async_file->ev_queue.lock);
 191 }
 192
 193 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 194                               struct ib_uevent_object *uobj)
 195 {
 196         struct ib_uverbs_event *evt, *tmp;
 197
 198         spin_lock_irq(&file->async_file->ev_queue.lock);
 199         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 200                 list_del(&evt->list);
 201                 kfree(evt);
 202         }
 203         spin_unlock_irq(&file->async_file->ev_queue.lock);
 204 }
 205
 206 void ib_uverbs_detach_umcast(struct ib_qp *qp,
 207                              struct ib_uqp_object *uobj)
 208 {
 209         struct ib_uverbs_mcast_entry *mcast, *tmp;
 210
 211         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 212                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 213                 list_del(&mcast->list);
 214                 kfree(mcast);
 215         }
 216 }
 217
 218 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 219                                       struct ib_ucontext *context,
 220                                       bool device_removed)
 221 {
 222         context->closing = 1;
 223         uverbs_cleanup_ucontext(context, device_removed);
 224         put_pid(context->tgid);
 225
 226         ib_rdmacg_uncharge(&context->cg_obj, context->device,
 227                            RDMACG_RESOURCE_HCA_HANDLE);
 228
 229         return context->device->dealloc_ucontext(context);
 230 }
 231
 232 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 233 {
 234         complete(&dev->comp);
 235 }
 236
 237 void ib_uverbs_release_file(struct kref *ref)
 238 {
 239         struct ib_uverbs_file *file =
 240                 container_of(ref, struct ib_uverbs_file, ref);
 241         struct ib_device *ib_dev;
 242         int srcu_key;
 243
 244         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 245         ib_dev = srcu_dereference(file->device->ib_dev,
 246                                   &file->device->disassociate_srcu);
 247         if (ib_dev && !ib_dev->disassociate_ucontext)
 248                 module_put(ib_dev->owner);
 249         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 250
 251         if (atomic_dec_and_test(&file->device->refcount))
 252                 ib_uverbs_comp_dev(file->device);
 253
 254         kobject_put(&file->device->kobj);
 255         kfree(file);
 256 }
 257
 258 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 259                                     struct ib_uverbs_file *uverbs_file,
 260                                     struct file *filp, char __user *buf,
 261                                     size_t count, loff_t *pos,
 262                                     size_t eventsz)
 263 {
 264         struct ib_uverbs_event *event;
 265         int ret = 0;
 266
 267         spin_lock_irq(&ev_queue->lock);
 268
 269         while (list_empty(&ev_queue->event_list)) {
 270                 spin_unlock_irq(&ev_queue->lock);
 271
 272                 if (filp->f_flags & O_NONBLOCK)
 273                         return -EAGAIN;
 274
 275                 if (wait_event_interruptible(ev_queue->poll_wait,
 276                                              (!list_empty(&ev_queue->event_list) ||
 277                         /* The barriers built into wait_event_interruptible()
 278                          * and wake_up() guarentee this will see the null set
 279                          * without using RCU
 280                          */
 281                                              !uverbs_file->device->ib_dev)))
 282                         return -ERESTARTSYS;
 283
 284                 /* If device was disassociated and no event exists set an error */
 285                 if (list_empty(&ev_queue->event_list) &&
 286                     !uverbs_file->device->ib_dev)
 287                         return -EIO;
 288
 289                 spin_lock_irq(&ev_queue->lock);
 290         }
 291
 292         event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 293
 294         if (eventsz > count) {
 295                 ret   = -EINVAL;
 296                 event = NULL;
 297         } else {
 298                 list_del(ev_queue->event_list.next);
 299                 if (event->counter) {
 300                         ++(*event->counter);
 301                         list_del(&event->obj_list);
 302                 }
 303         }
 304
 305         spin_unlock_irq(&ev_queue->lock);
 306
 307         if (event) {
 308                 if (copy_to_user(buf, event, eventsz))
 309                         ret = -EFAULT;
 310                 else
 311                         ret = eventsz;
 312         }
 313
 314         kfree(event);
 315
 316         return ret;
 317 }
 318
 319 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 320                                           size_t count, loff_t *pos)
 321 {
 322         struct ib_uverbs_async_event_file *file = filp->private_data;
 323
 324         return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp,
 325                                     buf, count, pos,
 326                                     sizeof(struct ib_uverbs_async_event_desc));
 327 }
 328
 329 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 330                                          size_t count, loff_t *pos)
 331 {
 332         struct ib_uverbs_completion_event_file *comp_ev_file =
 333                 filp->private_data;
 334
 335         return ib_uverbs_event_read(&comp_ev_file->ev_queue,
 336                                     comp_ev_file->uobj_file.ufile, filp,
 337                                     buf, count, pos,
 338                                     sizeof(struct ib_uverbs_comp_event_desc));
 339 }
 340
 341 static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 342                                          struct file *filp,
 343                                          struct poll_table_struct *wait)
 344 {
 345         unsigned int pollflags = 0;
 346
 347         poll_wait(filp, &ev_queue->poll_wait, wait);
 348
 349         spin_lock_irq(&ev_queue->lock);
 350         if (!list_empty(&ev_queue->event_list))
 351                 pollflags = POLLIN | POLLRDNORM;
 352         spin_unlock_irq(&ev_queue->lock);
 353
 354         return pollflags;
 355 }
 356
 357 static unsigned int ib_uverbs_async_event_poll(struct file *filp,
 358                                                struct poll_table_struct *wait)
 359 {
 360         return ib_uverbs_event_poll(filp->private_data, filp, wait);
 361 }
 362
 363 static unsigned int ib_uverbs_comp_event_poll(struct file *filp,
 364                                               struct poll_table_struct *wait)
 365 {
 366         struct ib_uverbs_completion_event_file *comp_ev_file =
 367                 filp->private_data;
 368
 369         return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 370 }
 371
 372 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 373 {
 374         struct ib_uverbs_event_queue *ev_queue = filp->private_data;
 375
 376         return fasync_helper(fd, filp, on, &ev_queue->async_queue);
 377 }
 378
 379 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 380 {
 381         struct ib_uverbs_completion_event_file *comp_ev_file =
 382                 filp->private_data;
 383
 384         return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 385 }
 386
 387 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp)
 388 {
 389         struct ib_uverbs_async_event_file *file = filp->private_data;
 390         struct ib_uverbs_file *uverbs_file = file->uverbs_file;
 391         struct ib_uverbs_event *entry, *tmp;
 392         int closed_already = 0;
 393
 394         mutex_lock(&uverbs_file->device->lists_mutex);
 395         spin_lock_irq(&file->ev_queue.lock);
 396         closed_already = file->ev_queue.is_closed;
 397         file->ev_queue.is_closed = 1;
 398         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 399                 if (entry->counter)
 400                         list_del(&entry->obj_list);
 401                 kfree(entry);
 402         }
 403         spin_unlock_irq(&file->ev_queue.lock);
 404         if (!closed_already) {
 405                 list_del(&file->list);
 406                 ib_unregister_event_handler(&uverbs_file->event_handler);
 407         }
 408         mutex_unlock(&uverbs_file->device->lists_mutex);
 409
 410         kref_put(&uverbs_file->ref, ib_uverbs_release_file);
 411         kref_put(&file->ref, ib_uverbs_release_async_event_file);
 412
 413         return 0;
 414 }
 415
 416 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp)
 417 {
 418         struct ib_uverbs_completion_event_file *file = filp->private_data;
 419         struct ib_uverbs_event *entry, *tmp;
 420
 421         spin_lock_irq(&file->ev_queue.lock);
 422         list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) {
 423                 if (entry->counter)
 424                         list_del(&entry->obj_list);
 425                 kfree(entry);
 426         }
 427         file->ev_queue.is_closed = 1;
 428         spin_unlock_irq(&file->ev_queue.lock);
 429
 430         uverbs_close_fd(filp);
 431
 432         return 0;
 433 }
 434
 435 const struct file_operations uverbs_event_fops = {
 436         .owner   = THIS_MODULE,
 437         .read    = ib_uverbs_comp_event_read,
 438         .poll    = ib_uverbs_comp_event_poll,
 439         .release = ib_uverbs_comp_event_close,
 440         .fasync  = ib_uverbs_comp_event_fasync,
 441         .llseek  = no_llseek,
 442 };
 443
 444 static const struct file_operations uverbs_async_event_fops = {
 445         .owner   = THIS_MODULE,
 446         .read    = ib_uverbs_async_event_read,
 447         .poll    = ib_uverbs_async_event_poll,
 448         .release = ib_uverbs_async_event_close,
 449         .fasync  = ib_uverbs_async_event_fasync,
 450         .llseek  = no_llseek,
 451 };
 452
 453 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 454 {
 455         struct ib_uverbs_event_queue   *ev_queue = cq_context;
 456         struct ib_ucq_object           *uobj;
 457         struct ib_uverbs_event         *entry;
 458         unsigned long                   flags;
 459
 460         if (!ev_queue)
 461                 return;
 462
 463         spin_lock_irqsave(&ev_queue->lock, flags);
 464         if (ev_queue->is_closed) {
 465                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 466                 return;
 467         }
 468
 469         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 470         if (!entry) {
 471                 spin_unlock_irqrestore(&ev_queue->lock, flags);
 472                 return;
 473         }
 474
 475         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 476
 477         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 478         entry->counter             = &uobj->comp_events_reported;
 479
 480         list_add_tail(&entry->list, &ev_queue->event_list);
 481         list_add_tail(&entry->obj_list, &uobj->comp_list);
 482         spin_unlock_irqrestore(&ev_queue->lock, flags);
 483
 484         wake_up_interruptible(&ev_queue->poll_wait);
 485         kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
 486 }
 487
 488 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 489                                     __u64 element, __u64 event,
 490                                     struct list_head *obj_list,
 491                                     u32 *counter)
 492 {
 493         struct ib_uverbs_event *entry;
 494         unsigned long flags;
 495
 496         spin_lock_irqsave(&file->async_file->ev_queue.lock, flags);
 497         if (file->async_file->ev_queue.is_closed) {
 498                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 499                 return;
 500         }
 501
 502         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 503         if (!entry) {
 504                 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 505                 return;
 506         }
 507
 508         entry->desc.async.element    = element;
 509         entry->desc.async.event_type = event;
 510         entry->desc.async.reserved   = 0;
 511         entry->counter               = counter;
 512
 513         list_add_tail(&entry->list, &file->async_file->ev_queue.event_list);
 514         if (obj_list)
 515                 list_add_tail(&entry->obj_list, obj_list);
 516         spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags);
 517
 518         wake_up_interruptible(&file->async_file->ev_queue.poll_wait);
 519         kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN);
 520 }
 521
 522 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 523 {
 524         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 525                                                   struct ib_ucq_object, uobject);
 526
 527         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 528                                 event->event, &uobj->async_list,
 529                                 &uobj->async_events_reported);
 530 }
 531
 532 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 533 {
 534         struct ib_uevent_object *uobj;
 535
 536         /* for XRC target qp's, check that qp is live */
 537         if (!event->element.qp->uobject)
 538                 return;
 539
 540         uobj = container_of(event->element.qp->uobject,
 541                             struct ib_uevent_object, uobject);
 542
 543         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 544                                 event->event, &uobj->event_list,
 545                                 &uobj->events_reported);
 546 }
 547
 548 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 549 {
 550         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
 551                                                   struct ib_uevent_object, uobject);
 552
 553         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 554                                 event->event, &uobj->event_list,
 555                                 &uobj->events_reported);
 556 }
 557
 558 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 559 {
 560         struct ib_uevent_object *uobj;
 561
 562         uobj = container_of(event->element.srq->uobject,
 563                             struct ib_uevent_object, uobject);
 564
 565         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 566                                 event->event, &uobj->event_list,
 567                                 &uobj->events_reported);
 568 }
 569
 570 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 571                              struct ib_event *event)
 572 {
 573         struct ib_uverbs_file *file =
 574                 container_of(handler, struct ib_uverbs_file, event_handler);
 575
 576         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 577                                 NULL, NULL);
 578 }
 579
 580 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 581 {
 582         kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file);
 583         file->async_file = NULL;
 584 }
 585
 586 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
 587 {
 588         spin_lock_init(&ev_queue->lock);
 589         INIT_LIST_HEAD(&ev_queue->event_list);
 590         init_waitqueue_head(&ev_queue->poll_wait);
 591         ev_queue->is_closed   = 0;
 592         ev_queue->async_queue = NULL;
 593 }
 594
 595 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file,
 596                                               struct ib_device  *ib_dev)
 597 {
 598         struct ib_uverbs_async_event_file *ev_file;
 599         struct file *filp;
 600
 601         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 602         if (!ev_file)
 603                 return ERR_PTR(-ENOMEM);
 604
 605         ib_uverbs_init_event_queue(&ev_file->ev_queue);
 606         ev_file->uverbs_file = uverbs_file;
 607         kref_get(&ev_file->uverbs_file->ref);
 608         kref_init(&ev_file->ref);
 609         filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops,
 610                                   ev_file, O_RDONLY);
 611         if (IS_ERR(filp))
 612                 goto err_put_refs;
 613
 614         mutex_lock(&uverbs_file->device->lists_mutex);
 615         list_add_tail(&ev_file->list,
 616                       &uverbs_file->device->uverbs_events_file_list);
 617         mutex_unlock(&uverbs_file->device->lists_mutex);
 618
 619         WARN_ON(uverbs_file->async_file);
 620         uverbs_file->async_file = ev_file;
 621         kref_get(&uverbs_file->async_file->ref);
 622         INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 623                               ib_dev,
 624                               ib_uverbs_event_handler);
 625         ib_register_event_handler(&uverbs_file->event_handler);
 626         /* At that point async file stuff was fully set */
 627
 628         return filp;
 629
 630 err_put_refs:
 631         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 632         kref_put(&ev_file->ref, ib_uverbs_release_async_event_file);
 633         return filp;
 634 }
 635
 636 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
 637 {
 638         u64 mask;
 639
 640         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
 641                 mask = ib_dev->uverbs_cmd_mask;
 642         else
 643                 mask = ib_dev->uverbs_ex_cmd_mask;
 644
 645         if (mask & ((u64)1 << command))
 646                 return 0;
 647
 648         return -1;
 649 }
 650
 651 static bool verify_command_idx(u32 command, bool extended)
 652 {
 653         if (extended)
 654                 return command < ARRAY_SIZE(uverbs_ex_cmd_table);
 655
 656         return command < ARRAY_SIZE(uverbs_cmd_table);
 657 }
 658
 659 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 660                              size_t count, loff_t *pos)
 661 {
 662         struct ib_uverbs_file *file = filp->private_data;
 663         struct ib_device *ib_dev;
 664         struct ib_uverbs_cmd_hdr hdr;
 665         bool extended_command;
 666         __u32 command;
 667         __u32 flags;
 668         int srcu_key;
 669         ssize_t ret;
 670
 671         if (!ib_safe_file_access(filp)) {
 672                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 673                             task_tgid_vnr(current), current->comm);
 674                 return -EACCES;
 675         }
 676
 677         if (count < sizeof hdr)
 678                 return -EINVAL;
 679
 680         if (copy_from_user(&hdr, buf, sizeof hdr))
 681                 return -EFAULT;
 682
 683         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 684         ib_dev = srcu_dereference(file->device->ib_dev,
 685                                   &file->device->disassociate_srcu);
 686         if (!ib_dev) {
 687                 ret = -EIO;
 688                 goto out;
 689         }
 690
 691         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 692                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
 693                 ret = -EINVAL;
 694                 goto out;
 695         }
 696
 697         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 698         flags = (hdr.command &
 699                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 700
 701         extended_command = flags & IB_USER_VERBS_CMD_FLAG_EXTENDED;
 702         if (!verify_command_idx(command, extended_command)) {
 703                 ret = -EINVAL;
 704                 goto out;
 705         }
 706
 707         if (verify_command_mask(ib_dev, command)) {
 708                 ret = -EOPNOTSUPP;
 709                 goto out;
 710         }
 711
 712         if (!file->ucontext &&
 713             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 714                 ret = -EINVAL;
 715                 goto out;
 716         }
 717
 718         if (!flags) {
 719                 if (!uverbs_cmd_table[command]) {
 720                         ret = -EINVAL;
 721                         goto out;
 722                 }
 723
 724                 if (hdr.in_words * 4 != count) {
 725                         ret = -EINVAL;
 726                         goto out;
 727                 }
 728
 729                 ret = uverbs_cmd_table[command](file, ib_dev,
 730                                                  buf + sizeof(hdr),
 731                                                  hdr.in_words * 4,
 732                                                  hdr.out_words * 4);
 733
 734         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 735                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 736                 struct ib_udata ucore;
 737                 struct ib_udata uhw;
 738                 size_t written_count = count;
 739
 740                 if (!uverbs_ex_cmd_table[command]) {
 741                         ret = -ENOSYS;
 742                         goto out;
 743                 }
 744
 745                 if (!file->ucontext) {
 746                         ret = -EINVAL;
 747                         goto out;
 748                 }
 749
 750                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 751                         ret = -EINVAL;
 752                         goto out;
 753                 }
 754
 755                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 756                         ret = -EFAULT;
 757                         goto out;
 758                 }
 759
 760                 count -= sizeof(hdr) + sizeof(ex_hdr);
 761                 buf += sizeof(hdr) + sizeof(ex_hdr);
 762
 763                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 764                         ret = -EINVAL;
 765                         goto out;
 766                 }
 767
 768                 if (ex_hdr.cmd_hdr_reserved) {
 769                         ret = -EINVAL;
 770                         goto out;
 771                 }
 772
 773                 if (ex_hdr.response) {
 774                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 775                                 ret = -EINVAL;
 776                                 goto out;
 777                         }
 778
 779                         if (!access_ok(VERIFY_WRITE,
 780                                        (void __user *) (unsigned long) ex_hdr.response,
 781                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 782                                 ret = -EFAULT;
 783                                 goto out;
 784                         }
 785                 } else {
 786                         if (hdr.out_words || ex_hdr.provider_out_words) {
 787                                 ret = -EINVAL;
 788                                 goto out;
 789                         }
 790                 }
 791
 792                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 793                                        hdr.in_words * 8, hdr.out_words * 8);
 794
 795                 INIT_UDATA_BUF_OR_NULL(&uhw,
 796                                        buf + ucore.inlen,
 797                                        (unsigned long) ex_hdr.response + ucore.outlen,
 798                                        ex_hdr.provider_in_words * 8,
 799                                        ex_hdr.provider_out_words * 8);
 800
 801                 ret = uverbs_ex_cmd_table[command](file,
 802                                                    ib_dev,
 803                                                    &ucore,
 804                                                    &uhw);
 805                 if (!ret)
 806                         ret = written_count;
 807         } else {
 808                 ret = -ENOSYS;
 809         }
 810
 811 out:
 812         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 813         return ret;
 814 }
 815
 816 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 817 {
 818         struct ib_uverbs_file *file = filp->private_data;
 819         struct ib_device *ib_dev;
 820         int ret = 0;
 821         int srcu_key;
 822
 823         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 824         ib_dev = srcu_dereference(file->device->ib_dev,
 825                                   &file->device->disassociate_srcu);
 826         if (!ib_dev) {
 827                 ret = -EIO;
 828                 goto out;
 829         }
 830
 831         if (!file->ucontext)
 832                 ret = -ENODEV;
 833         else
 834                 ret = ib_dev->mmap(file->ucontext, vma);
 835 out:
 836         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 837         return ret;
 838 }
 839
 840 /*
 841  * ib_uverbs_open() does not need the BKL:
 842  *
 843  *  - the ib_uverbs_device structures are properly reference counted and
 844  *    everything else is purely local to the file being created, so
 845  *    races against other open calls are not a problem;
 846  *  - there is no ioctl method to race against;
 847  *  - the open method will either immediately run -ENXIO, or all
 848  *    required initialization will be done.
 849  */
 850 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 851 {
 852         struct ib_uverbs_device *dev;
 853         struct ib_uverbs_file *file;
 854         struct ib_device *ib_dev;
 855         int ret;
 856         int module_dependent;
 857         int srcu_key;
 858
 859         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 860         if (!atomic_inc_not_zero(&dev->refcount))
 861                 return -ENXIO;
 862
 863         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 864         mutex_lock(&dev->lists_mutex);
 865         ib_dev = srcu_dereference(dev->ib_dev,
 866                                   &dev->disassociate_srcu);
 867         if (!ib_dev) {
 868                 ret = -EIO;
 869                 goto err;
 870         }
 871
 872         /* In case IB device supports disassociate ucontext, there is no hard
 873          * dependency between uverbs device and its low level device.
 874          */
 875         module_dependent = !(ib_dev->disassociate_ucontext);
 876
 877         if (module_dependent) {
 878                 if (!try_module_get(ib_dev->owner)) {
 879                         ret = -ENODEV;
 880                         goto err;
 881                 }
 882         }
 883
 884         file = kzalloc(sizeof(*file), GFP_KERNEL);
 885         if (!file) {
 886                 ret = -ENOMEM;
 887                 if (module_dependent)
 888                         goto err_module;
 889
 890                 goto err;
 891         }
 892
 893         file->device     = dev;
 894         spin_lock_init(&file->idr_lock);
 895         idr_init(&file->idr);
 896         file->ucontext   = NULL;
 897         file->async_file = NULL;
 898         kref_init(&file->ref);
 899         mutex_init(&file->mutex);
 900         mutex_init(&file->cleanup_mutex);
 901
 902         filp->private_data = file;
 903         kobject_get(&dev->kobj);
 904         list_add_tail(&file->list, &dev->uverbs_file_list);
 905         mutex_unlock(&dev->lists_mutex);
 906         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 907
 908         return nonseekable_open(inode, filp);
 909
 910 err_module:
 911         module_put(ib_dev->owner);
 912
 913 err:
 914         mutex_unlock(&dev->lists_mutex);
 915         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 916         if (atomic_dec_and_test(&dev->refcount))
 917                 ib_uverbs_comp_dev(dev);
 918
 919         return ret;
 920 }
 921
 922 static int ib_uverbs_close(struct inode *inode, struct file *filp)
 923 {
 924         struct ib_uverbs_file *file = filp->private_data;
 925
 926         mutex_lock(&file->cleanup_mutex);
 927         if (file->ucontext) {
 928                 ib_uverbs_cleanup_ucontext(file, file->ucontext, false);
 929                 file->ucontext = NULL;
 930         }
 931         mutex_unlock(&file->cleanup_mutex);
 932         idr_destroy(&file->idr);
 933
 934         mutex_lock(&file->device->lists_mutex);
 935         if (!file->is_closed) {
 936                 list_del(&file->list);
 937                 file->is_closed = 1;
 938         }
 939         mutex_unlock(&file->device->lists_mutex);
 940
 941         if (file->async_file)
 942                 kref_put(&file->async_file->ref,
 943                          ib_uverbs_release_async_event_file);
 944
 945         kref_put(&file->ref, ib_uverbs_release_file);
 946
 947         return 0;
 948 }
 949
 950 static const struct file_operations uverbs_fops = {
 951         .owner   = THIS_MODULE,
 952         .write   = ib_uverbs_write,
 953         .open    = ib_uverbs_open,
 954         .release = ib_uverbs_close,
 955         .llseek  = no_llseek,
 956 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
 957         .unlocked_ioctl = ib_uverbs_ioctl,
 958 #endif
 959 };
 960
 961 static const struct file_operations uverbs_mmap_fops = {
 962         .owner   = THIS_MODULE,
 963         .write   = ib_uverbs_write,
 964         .mmap    = ib_uverbs_mmap,
 965         .open    = ib_uverbs_open,
 966         .release = ib_uverbs_close,
 967         .llseek  = no_llseek,
 968 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS)
 969         .unlocked_ioctl = ib_uverbs_ioctl,
 970 #endif
 971 };
 972
 973 static struct ib_client uverbs_client = {
 974         .name   = "uverbs",
 975         .add    = ib_uverbs_add_one,
 976         .remove = ib_uverbs_remove_one
 977 };
 978
 979 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
 980                           char *buf)
 981 {
 982         int ret = -ENODEV;
 983         int srcu_key;
 984         struct ib_uverbs_device *dev = dev_get_drvdata(device);
 985         struct ib_device *ib_dev;
 986
 987         if (!dev)
 988                 return -ENODEV;
 989
 990         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 991         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
 992         if (ib_dev)
 993                 ret = sprintf(buf, "%s\n", ib_dev->name);
 994         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 995
 996         return ret;
 997 }
 998 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
 999
1000 static ssize_t show_dev_abi_version(struct device *device,
1001                                     struct device_attribute *attr, char *buf)
1002 {
1003         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1004         int ret = -ENODEV;
1005         int srcu_key;
1006         struct ib_device *ib_dev;
1007
1008         if (!dev)
1009                 return -ENODEV;
1010         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1011         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1012         if (ib_dev)
1013                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1014         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1015
1016         return ret;
1017 }
1018 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1019
1020 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1021                          __stringify(IB_USER_VERBS_ABI_VERSION));
1022
1023 static dev_t overflow_maj;
1024 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1025
1026 /*
1027  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1028  * requesting a new major number and doubling the number of max devices we
1029  * support. It's stupid, but simple.
1030  */
1031 static int find_overflow_devnum(void)
1032 {
1033         int ret;
1034
1035         if (!overflow_maj) {
1036                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1037                                           "infiniband_verbs");
1038                 if (ret) {
1039                         pr_err("user_verbs: couldn't register dynamic device number\n");
1040                         return ret;
1041                 }
1042         }
1043
1044         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1045         if (ret >= IB_UVERBS_MAX_DEVICES)
1046                 return -1;
1047
1048         return ret;
1049 }
1050
1051 static void ib_uverbs_add_one(struct ib_device *device)
1052 {
1053         int devnum;
1054         dev_t base;
1055         struct ib_uverbs_device *uverbs_dev;
1056         int ret;
1057
1058         if (!device->alloc_ucontext)
1059                 return;
1060
1061         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1062         if (!uverbs_dev)
1063                 return;
1064
1065         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1066         if (ret) {
1067                 kfree(uverbs_dev);
1068                 return;
1069         }
1070
1071         atomic_set(&uverbs_dev->refcount, 1);
1072         init_completion(&uverbs_dev->comp);
1073         uverbs_dev->xrcd_tree = RB_ROOT;
1074         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1075         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1076         mutex_init(&uverbs_dev->lists_mutex);
1077         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1078         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1079
1080         spin_lock(&map_lock);
1081         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1082         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1083                 spin_unlock(&map_lock);
1084                 devnum = find_overflow_devnum();
1085                 if (devnum < 0)
1086                         goto err;
1087
1088                 spin_lock(&map_lock);
1089                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1090                 base = devnum + overflow_maj;
1091                 set_bit(devnum, overflow_map);
1092         } else {
1093                 uverbs_dev->devnum = devnum;
1094                 base = devnum + IB_UVERBS_BASE_DEV;
1095                 set_bit(devnum, dev_map);
1096         }
1097         spin_unlock(&map_lock);
1098
1099         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1100         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1101
1102         cdev_init(&uverbs_dev->cdev, NULL);
1103         uverbs_dev->cdev.owner = THIS_MODULE;
1104         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1105         cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj);
1106         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1107         if (cdev_add(&uverbs_dev->cdev, base, 1))
1108                 goto err_cdev;
1109
1110         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1111                                         uverbs_dev->cdev.dev, uverbs_dev,
1112                                         "uverbs%d", uverbs_dev->devnum);
1113         if (IS_ERR(uverbs_dev->dev))
1114                 goto err_cdev;
1115
1116         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1117                 goto err_class;
1118         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1119                 goto err_class;
1120
1121         if (!device->specs_root) {
1122                 const struct uverbs_object_tree_def *default_root[] = {
1123                         uverbs_default_get_objects()};
1124
1125                 uverbs_dev->specs_root = uverbs_alloc_spec_tree(1,
1126                                                                 default_root);
1127                 if (IS_ERR(uverbs_dev->specs_root))
1128                         goto err_class;
1129
1130                 device->specs_root = uverbs_dev->specs_root;
1131         }
1132
1133         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1134
1135         return;
1136
1137 err_class:
1138         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1139
1140 err_cdev:
1141         cdev_del(&uverbs_dev->cdev);
1142         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1143                 clear_bit(devnum, dev_map);
1144         else
1145                 clear_bit(devnum, overflow_map);
1146
1147 err:
1148         if (atomic_dec_and_test(&uverbs_dev->refcount))
1149                 ib_uverbs_comp_dev(uverbs_dev);
1150         wait_for_completion(&uverbs_dev->comp);
1151         kobject_put(&uverbs_dev->kobj);
1152         return;
1153 }
1154
1155 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1156                                         struct ib_device *ib_dev)
1157 {
1158         struct ib_uverbs_file *file;
1159         struct ib_uverbs_async_event_file *event_file;
1160         struct ib_event event;
1161
1162         /* Pending running commands to terminate */
1163         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1164         event.event = IB_EVENT_DEVICE_FATAL;
1165         event.element.port_num = 0;
1166         event.device = ib_dev;
1167
1168         mutex_lock(&uverbs_dev->lists_mutex);
1169         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1170                 struct ib_ucontext *ucontext;
1171                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1172                                         struct ib_uverbs_file, list);
1173                 file->is_closed = 1;
1174                 list_del(&file->list);
1175                 kref_get(&file->ref);
1176                 mutex_unlock(&uverbs_dev->lists_mutex);
1177
1178
1179                 mutex_lock(&file->cleanup_mutex);
1180                 ucontext = file->ucontext;
1181                 file->ucontext = NULL;
1182                 mutex_unlock(&file->cleanup_mutex);
1183
1184                 /* At this point ib_uverbs_close cannot be running
1185                  * ib_uverbs_cleanup_ucontext
1186                  */
1187                 if (ucontext) {
1188                         /* We must release the mutex before going ahead and
1189                          * calling disassociate_ucontext. disassociate_ucontext
1190                          * might end up indirectly calling uverbs_close,
1191                          * for example due to freeing the resources
1192                          * (e.g mmput).
1193                          */
1194                         ib_uverbs_event_handler(&file->event_handler, &event);
1195                         ib_dev->disassociate_ucontext(ucontext);
1196                         mutex_lock(&file->cleanup_mutex);
1197                         ib_uverbs_cleanup_ucontext(file, ucontext, true);
1198                         mutex_unlock(&file->cleanup_mutex);
1199                 }
1200
1201                 mutex_lock(&uverbs_dev->lists_mutex);
1202                 kref_put(&file->ref, ib_uverbs_release_file);
1203         }
1204
1205         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1206                 event_file = list_first_entry(&uverbs_dev->
1207                                               uverbs_events_file_list,
1208                                               struct ib_uverbs_async_event_file,
1209                                               list);
1210                 spin_lock_irq(&event_file->ev_queue.lock);
1211                 event_file->ev_queue.is_closed = 1;
1212                 spin_unlock_irq(&event_file->ev_queue.lock);
1213
1214                 list_del(&event_file->list);
1215                 ib_unregister_event_handler(
1216                         &event_file->uverbs_file->event_handler);
1217                 event_file->uverbs_file->event_handler.device =
1218                         NULL;
1219
1220                 wake_up_interruptible(&event_file->ev_queue.poll_wait);
1221                 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN);
1222         }
1223         mutex_unlock(&uverbs_dev->lists_mutex);
1224 }
1225
1226 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1227 {
1228         struct ib_uverbs_device *uverbs_dev = client_data;
1229         int wait_clients = 1;
1230
1231         if (!uverbs_dev)
1232                 return;
1233
1234         dev_set_drvdata(uverbs_dev->dev, NULL);
1235         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1236         cdev_del(&uverbs_dev->cdev);
1237
1238         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1239                 clear_bit(uverbs_dev->devnum, dev_map);
1240         else
1241                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1242
1243         if (device->disassociate_ucontext) {
1244                 /* We disassociate HW resources and immediately return.
1245                  * Userspace will see a EIO errno for all future access.
1246                  * Upon returning, ib_device may be freed internally and is not
1247                  * valid any more.
1248                  * uverbs_device is still available until all clients close
1249                  * their files, then the uverbs device ref count will be zero
1250                  * and its resources will be freed.
1251                  * Note: At this point no more files can be opened since the
1252                  * cdev was deleted, however active clients can still issue
1253                  * commands and close their open files.
1254                  */
1255                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1256                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1257                 wait_clients = 0;
1258         }
1259
1260         if (atomic_dec_and_test(&uverbs_dev->refcount))
1261                 ib_uverbs_comp_dev(uverbs_dev);
1262         if (wait_clients)
1263                 wait_for_completion(&uverbs_dev->comp);
1264         if (uverbs_dev->specs_root) {
1265                 uverbs_free_spec_tree(uverbs_dev->specs_root);
1266                 device->specs_root = NULL;
1267         }
1268
1269         kobject_put(&uverbs_dev->kobj);
1270 }
1271
1272 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1273 {
1274         if (mode)
1275                 *mode = 0666;
1276         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1277 }
1278
1279 static int __init ib_uverbs_init(void)
1280 {
1281         int ret;
1282
1283         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1284                                      "infiniband_verbs");
1285         if (ret) {
1286                 pr_err("user_verbs: couldn't register device number\n");
1287                 goto out;
1288         }
1289
1290         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1291         if (IS_ERR(uverbs_class)) {
1292                 ret = PTR_ERR(uverbs_class);
1293                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1294                 goto out_chrdev;
1295         }
1296
1297         uverbs_class->devnode = uverbs_devnode;
1298
1299         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1300         if (ret) {
1301                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1302                 goto out_class;
1303         }
1304
1305         ret = ib_register_client(&uverbs_client);
1306         if (ret) {
1307                 pr_err("user_verbs: couldn't register client\n");
1308                 goto out_class;
1309         }
1310
1311         return 0;
1312
1313 out_class:
1314         class_destroy(uverbs_class);
1315
1316 out_chrdev:
1317         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1318
1319 out:
1320         return ret;
1321 }
1322
1323 static void __exit ib_uverbs_cleanup(void)
1324 {
1325         ib_unregister_client(&uverbs_client);
1326         class_destroy(uverbs_class);
1327         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1328         if (overflow_maj)
1329                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1330 }
1331
1332 module_init(ib_uverbs_init);
1333 module_exit(ib_uverbs_cleanup);