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
  53 #include "uverbs.h"
  54 #include "core_priv.h"
  55
  56 MODULE_AUTHOR("Roland Dreier");
  57 MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  58 MODULE_LICENSE("Dual BSD/GPL");
  59
  60 enum {
  61         IB_UVERBS_MAJOR       = 231,
  62         IB_UVERBS_BASE_MINOR  = 192,
  63         IB_UVERBS_MAX_DEVICES = 32
  64 };
  65
  66 #define IB_UVERBS_BASE_DEV      MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  67
  68 static struct class *uverbs_class;
  69
  70 DEFINE_SPINLOCK(ib_uverbs_idr_lock);
  71 DEFINE_IDR(ib_uverbs_pd_idr);
  72 DEFINE_IDR(ib_uverbs_mr_idr);
  73 DEFINE_IDR(ib_uverbs_mw_idr);
  74 DEFINE_IDR(ib_uverbs_ah_idr);
  75 DEFINE_IDR(ib_uverbs_cq_idr);
  76 DEFINE_IDR(ib_uverbs_qp_idr);
  77 DEFINE_IDR(ib_uverbs_srq_idr);
  78 DEFINE_IDR(ib_uverbs_xrcd_idr);
  79 DEFINE_IDR(ib_uverbs_rule_idr);
  80 DEFINE_IDR(ib_uverbs_wq_idr);
  81 DEFINE_IDR(ib_uverbs_rwq_ind_tbl_idr);
  82
  83 static DEFINE_SPINLOCK(map_lock);
  84 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES);
  85
  86 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file,
  87                                      struct ib_device *ib_dev,
  88                                      const char __user *buf, int in_len,
  89                                      int out_len) = {
  90         [IB_USER_VERBS_CMD_GET_CONTEXT]         = ib_uverbs_get_context,
  91         [IB_USER_VERBS_CMD_QUERY_DEVICE]        = ib_uverbs_query_device,
  92         [IB_USER_VERBS_CMD_QUERY_PORT]          = ib_uverbs_query_port,
  93         [IB_USER_VERBS_CMD_ALLOC_PD]            = ib_uverbs_alloc_pd,
  94         [IB_USER_VERBS_CMD_DEALLOC_PD]          = ib_uverbs_dealloc_pd,
  95         [IB_USER_VERBS_CMD_REG_MR]              = ib_uverbs_reg_mr,
  96         [IB_USER_VERBS_CMD_REREG_MR]            = ib_uverbs_rereg_mr,
  97         [IB_USER_VERBS_CMD_DEREG_MR]            = ib_uverbs_dereg_mr,
  98         [IB_USER_VERBS_CMD_ALLOC_MW]            = ib_uverbs_alloc_mw,
  99         [IB_USER_VERBS_CMD_DEALLOC_MW]          = ib_uverbs_dealloc_mw,
 100         [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel,
 101         [IB_USER_VERBS_CMD_CREATE_CQ]           = ib_uverbs_create_cq,
 102         [IB_USER_VERBS_CMD_RESIZE_CQ]           = ib_uverbs_resize_cq,
 103         [IB_USER_VERBS_CMD_POLL_CQ]             = ib_uverbs_poll_cq,
 104         [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ]       = ib_uverbs_req_notify_cq,
 105         [IB_USER_VERBS_CMD_DESTROY_CQ]          = ib_uverbs_destroy_cq,
 106         [IB_USER_VERBS_CMD_CREATE_QP]           = ib_uverbs_create_qp,
 107         [IB_USER_VERBS_CMD_QUERY_QP]            = ib_uverbs_query_qp,
 108         [IB_USER_VERBS_CMD_MODIFY_QP]           = ib_uverbs_modify_qp,
 109         [IB_USER_VERBS_CMD_DESTROY_QP]          = ib_uverbs_destroy_qp,
 110         [IB_USER_VERBS_CMD_POST_SEND]           = ib_uverbs_post_send,
 111         [IB_USER_VERBS_CMD_POST_RECV]           = ib_uverbs_post_recv,
 112         [IB_USER_VERBS_CMD_POST_SRQ_RECV]       = ib_uverbs_post_srq_recv,
 113         [IB_USER_VERBS_CMD_CREATE_AH]           = ib_uverbs_create_ah,
 114         [IB_USER_VERBS_CMD_DESTROY_AH]          = ib_uverbs_destroy_ah,
 115         [IB_USER_VERBS_CMD_ATTACH_MCAST]        = ib_uverbs_attach_mcast,
 116         [IB_USER_VERBS_CMD_DETACH_MCAST]        = ib_uverbs_detach_mcast,
 117         [IB_USER_VERBS_CMD_CREATE_SRQ]          = ib_uverbs_create_srq,
 118         [IB_USER_VERBS_CMD_MODIFY_SRQ]          = ib_uverbs_modify_srq,
 119         [IB_USER_VERBS_CMD_QUERY_SRQ]           = ib_uverbs_query_srq,
 120         [IB_USER_VERBS_CMD_DESTROY_SRQ]         = ib_uverbs_destroy_srq,
 121         [IB_USER_VERBS_CMD_OPEN_XRCD]           = ib_uverbs_open_xrcd,
 122         [IB_USER_VERBS_CMD_CLOSE_XRCD]          = ib_uverbs_close_xrcd,
 123         [IB_USER_VERBS_CMD_CREATE_XSRQ]         = ib_uverbs_create_xsrq,
 124         [IB_USER_VERBS_CMD_OPEN_QP]             = ib_uverbs_open_qp,
 125 };
 126
 127 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file,
 128                                     struct ib_device *ib_dev,
 129                                     struct ib_udata *ucore,
 130                                     struct ib_udata *uhw) = {
 131         [IB_USER_VERBS_EX_CMD_CREATE_FLOW]      = ib_uverbs_ex_create_flow,
 132         [IB_USER_VERBS_EX_CMD_DESTROY_FLOW]     = ib_uverbs_ex_destroy_flow,
 133         [IB_USER_VERBS_EX_CMD_QUERY_DEVICE]     = ib_uverbs_ex_query_device,
 134         [IB_USER_VERBS_EX_CMD_CREATE_CQ]        = ib_uverbs_ex_create_cq,
 135         [IB_USER_VERBS_EX_CMD_CREATE_QP]        = ib_uverbs_ex_create_qp,
 136         [IB_USER_VERBS_EX_CMD_CREATE_WQ]        = ib_uverbs_ex_create_wq,
 137         [IB_USER_VERBS_EX_CMD_MODIFY_WQ]        = ib_uverbs_ex_modify_wq,
 138         [IB_USER_VERBS_EX_CMD_DESTROY_WQ]       = ib_uverbs_ex_destroy_wq,
 139         [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table,
 140         [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table,
 141         [IB_USER_VERBS_EX_CMD_MODIFY_QP]        = ib_uverbs_ex_modify_qp,
 142 };
 143
 144 static void ib_uverbs_add_one(struct ib_device *device);
 145 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
 146
 147 int uverbs_dealloc_mw(struct ib_mw *mw)
 148 {
 149         struct ib_pd *pd = mw->pd;
 150         int ret;
 151
 152         ret = mw->device->dealloc_mw(mw);
 153         if (!ret)
 154                 atomic_dec(&pd->usecnt);
 155         return ret;
 156 }
 157
 158 static void ib_uverbs_release_dev(struct kobject *kobj)
 159 {
 160         struct ib_uverbs_device *dev =
 161                 container_of(kobj, struct ib_uverbs_device, kobj);
 162
 163         cleanup_srcu_struct(&dev->disassociate_srcu);
 164         kfree(dev);
 165 }
 166
 167 static struct kobj_type ib_uverbs_dev_ktype = {
 168         .release = ib_uverbs_release_dev,
 169 };
 170
 171 static void ib_uverbs_release_event_file(struct kref *ref)
 172 {
 173         struct ib_uverbs_event_file *file =
 174                 container_of(ref, struct ib_uverbs_event_file, ref);
 175
 176         kfree(file);
 177 }
 178
 179 void ib_uverbs_release_ucq(struct ib_uverbs_file *file,
 180                           struct ib_uverbs_event_file *ev_file,
 181                           struct ib_ucq_object *uobj)
 182 {
 183         struct ib_uverbs_event *evt, *tmp;
 184
 185         if (ev_file) {
 186                 spin_lock_irq(&ev_file->lock);
 187                 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 188                         list_del(&evt->list);
 189                         kfree(evt);
 190                 }
 191                 spin_unlock_irq(&ev_file->lock);
 192
 193                 kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 194         }
 195
 196         spin_lock_irq(&file->async_file->lock);
 197         list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) {
 198                 list_del(&evt->list);
 199                 kfree(evt);
 200         }
 201         spin_unlock_irq(&file->async_file->lock);
 202 }
 203
 204 void ib_uverbs_release_uevent(struct ib_uverbs_file *file,
 205                               struct ib_uevent_object *uobj)
 206 {
 207         struct ib_uverbs_event *evt, *tmp;
 208
 209         spin_lock_irq(&file->async_file->lock);
 210         list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 211                 list_del(&evt->list);
 212                 kfree(evt);
 213         }
 214         spin_unlock_irq(&file->async_file->lock);
 215 }
 216
 217 static void ib_uverbs_detach_umcast(struct ib_qp *qp,
 218                                     struct ib_uqp_object *uobj)
 219 {
 220         struct ib_uverbs_mcast_entry *mcast, *tmp;
 221
 222         list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 223                 ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 224                 list_del(&mcast->list);
 225                 kfree(mcast);
 226         }
 227 }
 228
 229 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file,
 230                                       struct ib_ucontext *context)
 231 {
 232         struct ib_uobject *uobj, *tmp;
 233
 234         context->closing = 1;
 235
 236         list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) {
 237                 struct ib_ah *ah = uobj->object;
 238
 239                 idr_remove_uobj(&ib_uverbs_ah_idr, uobj);
 240                 ib_destroy_ah(ah);
 241                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 242                                    RDMACG_RESOURCE_HCA_OBJECT);
 243                 kfree(uobj);
 244         }
 245
 246         /* Remove MWs before QPs, in order to support type 2A MWs. */
 247         list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) {
 248                 struct ib_mw *mw = uobj->object;
 249
 250                 idr_remove_uobj(&ib_uverbs_mw_idr, uobj);
 251                 uverbs_dealloc_mw(mw);
 252                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 253                                    RDMACG_RESOURCE_HCA_OBJECT);
 254                 kfree(uobj);
 255         }
 256
 257         list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) {
 258                 struct ib_flow *flow_id = uobj->object;
 259
 260                 idr_remove_uobj(&ib_uverbs_rule_idr, uobj);
 261                 ib_destroy_flow(flow_id);
 262                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 263                                    RDMACG_RESOURCE_HCA_OBJECT);
 264                 kfree(uobj);
 265         }
 266
 267         list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) {
 268                 struct ib_qp *qp = uobj->object;
 269                 struct ib_uqp_object *uqp =
 270                         container_of(uobj, struct ib_uqp_object, uevent.uobject);
 271
 272                 idr_remove_uobj(&ib_uverbs_qp_idr, uobj);
 273                 if (qp == qp->real_qp)
 274                         ib_uverbs_detach_umcast(qp, uqp);
 275                 ib_destroy_qp(qp);
 276                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 277                                    RDMACG_RESOURCE_HCA_OBJECT);
 278                 ib_uverbs_release_uevent(file, &uqp->uevent);
 279                 kfree(uqp);
 280         }
 281
 282         list_for_each_entry_safe(uobj, tmp, &context->rwq_ind_tbl_list, list) {
 283                 struct ib_rwq_ind_table *rwq_ind_tbl = uobj->object;
 284                 struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl;
 285
 286                 idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj);
 287                 ib_destroy_rwq_ind_table(rwq_ind_tbl);
 288                 kfree(ind_tbl);
 289                 kfree(uobj);
 290         }
 291
 292         list_for_each_entry_safe(uobj, tmp, &context->wq_list, list) {
 293                 struct ib_wq *wq = uobj->object;
 294                 struct ib_uwq_object *uwq =
 295                         container_of(uobj, struct ib_uwq_object, uevent.uobject);
 296
 297                 idr_remove_uobj(&ib_uverbs_wq_idr, uobj);
 298                 ib_destroy_wq(wq);
 299                 ib_uverbs_release_uevent(file, &uwq->uevent);
 300                 kfree(uwq);
 301         }
 302
 303         list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) {
 304                 struct ib_srq *srq = uobj->object;
 305                 struct ib_uevent_object *uevent =
 306                         container_of(uobj, struct ib_uevent_object, uobject);
 307
 308                 idr_remove_uobj(&ib_uverbs_srq_idr, uobj);
 309                 ib_destroy_srq(srq);
 310                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 311                                    RDMACG_RESOURCE_HCA_OBJECT);
 312                 ib_uverbs_release_uevent(file, uevent);
 313                 kfree(uevent);
 314         }
 315
 316         list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) {
 317                 struct ib_cq *cq = uobj->object;
 318                 struct ib_uverbs_event_file *ev_file = cq->cq_context;
 319                 struct ib_ucq_object *ucq =
 320                         container_of(uobj, struct ib_ucq_object, uobject);
 321
 322                 idr_remove_uobj(&ib_uverbs_cq_idr, uobj);
 323                 ib_destroy_cq(cq);
 324                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 325                                    RDMACG_RESOURCE_HCA_OBJECT);
 326                 ib_uverbs_release_ucq(file, ev_file, ucq);
 327                 kfree(ucq);
 328         }
 329
 330         list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) {
 331                 struct ib_mr *mr = uobj->object;
 332
 333                 idr_remove_uobj(&ib_uverbs_mr_idr, uobj);
 334                 ib_dereg_mr(mr);
 335                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 336                                    RDMACG_RESOURCE_HCA_OBJECT);
 337                 kfree(uobj);
 338         }
 339
 340         mutex_lock(&file->device->xrcd_tree_mutex);
 341         list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) {
 342                 struct ib_xrcd *xrcd = uobj->object;
 343                 struct ib_uxrcd_object *uxrcd =
 344                         container_of(uobj, struct ib_uxrcd_object, uobject);
 345
 346                 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj);
 347                 ib_uverbs_dealloc_xrcd(file->device, xrcd);
 348                 kfree(uxrcd);
 349         }
 350         mutex_unlock(&file->device->xrcd_tree_mutex);
 351
 352         list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) {
 353                 struct ib_pd *pd = uobj->object;
 354
 355                 idr_remove_uobj(&ib_uverbs_pd_idr, uobj);
 356                 ib_dealloc_pd(pd);
 357                 ib_rdmacg_uncharge(&uobj->cg_obj, context->device,
 358                                    RDMACG_RESOURCE_HCA_OBJECT);
 359                 kfree(uobj);
 360         }
 361
 362         put_pid(context->tgid);
 363
 364         ib_rdmacg_uncharge(&context->cg_obj, context->device,
 365                            RDMACG_RESOURCE_HCA_HANDLE);
 366
 367         return context->device->dealloc_ucontext(context);
 368 }
 369
 370 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 371 {
 372         complete(&dev->comp);
 373 }
 374
 375 static void ib_uverbs_release_file(struct kref *ref)
 376 {
 377         struct ib_uverbs_file *file =
 378                 container_of(ref, struct ib_uverbs_file, ref);
 379         struct ib_device *ib_dev;
 380         int srcu_key;
 381
 382         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 383         ib_dev = srcu_dereference(file->device->ib_dev,
 384                                   &file->device->disassociate_srcu);
 385         if (ib_dev && !ib_dev->disassociate_ucontext)
 386                 module_put(ib_dev->owner);
 387         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 388
 389         if (atomic_dec_and_test(&file->device->refcount))
 390                 ib_uverbs_comp_dev(file->device);
 391
 392         kfree(file);
 393 }
 394
 395 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf,
 396                                     size_t count, loff_t *pos)
 397 {
 398         struct ib_uverbs_event_file *file = filp->private_data;
 399         struct ib_uverbs_event *event;
 400         int eventsz;
 401         int ret = 0;
 402
 403         spin_lock_irq(&file->lock);
 404
 405         while (list_empty(&file->event_list)) {
 406                 spin_unlock_irq(&file->lock);
 407
 408                 if (filp->f_flags & O_NONBLOCK)
 409                         return -EAGAIN;
 410
 411                 if (wait_event_interruptible(file->poll_wait,
 412                                              (!list_empty(&file->event_list) ||
 413                         /* The barriers built into wait_event_interruptible()
 414                          * and wake_up() guarentee this will see the null set
 415                          * without using RCU
 416                          */
 417                                              !file->uverbs_file->device->ib_dev)))
 418                         return -ERESTARTSYS;
 419
 420                 /* If device was disassociated and no event exists set an error */
 421                 if (list_empty(&file->event_list) &&
 422                     !file->uverbs_file->device->ib_dev)
 423                         return -EIO;
 424
 425                 spin_lock_irq(&file->lock);
 426         }
 427
 428         event = list_entry(file->event_list.next, struct ib_uverbs_event, list);
 429
 430         if (file->is_async)
 431                 eventsz = sizeof (struct ib_uverbs_async_event_desc);
 432         else
 433                 eventsz = sizeof (struct ib_uverbs_comp_event_desc);
 434
 435         if (eventsz > count) {
 436                 ret   = -EINVAL;
 437                 event = NULL;
 438         } else {
 439                 list_del(file->event_list.next);
 440                 if (event->counter) {
 441                         ++(*event->counter);
 442                         list_del(&event->obj_list);
 443                 }
 444         }
 445
 446         spin_unlock_irq(&file->lock);
 447
 448         if (event) {
 449                 if (copy_to_user(buf, event, eventsz))
 450                         ret = -EFAULT;
 451                 else
 452                         ret = eventsz;
 453         }
 454
 455         kfree(event);
 456
 457         return ret;
 458 }
 459
 460 static unsigned int ib_uverbs_event_poll(struct file *filp,
 461                                          struct poll_table_struct *wait)
 462 {
 463         unsigned int pollflags = 0;
 464         struct ib_uverbs_event_file *file = filp->private_data;
 465
 466         poll_wait(filp, &file->poll_wait, wait);
 467
 468         spin_lock_irq(&file->lock);
 469         if (!list_empty(&file->event_list))
 470                 pollflags = POLLIN | POLLRDNORM;
 471         spin_unlock_irq(&file->lock);
 472
 473         return pollflags;
 474 }
 475
 476 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on)
 477 {
 478         struct ib_uverbs_event_file *file = filp->private_data;
 479
 480         return fasync_helper(fd, filp, on, &file->async_queue);
 481 }
 482
 483 static int ib_uverbs_event_close(struct inode *inode, struct file *filp)
 484 {
 485         struct ib_uverbs_event_file *file = filp->private_data;
 486         struct ib_uverbs_event *entry, *tmp;
 487         int closed_already = 0;
 488
 489         mutex_lock(&file->uverbs_file->device->lists_mutex);
 490         spin_lock_irq(&file->lock);
 491         closed_already = file->is_closed;
 492         file->is_closed = 1;
 493         list_for_each_entry_safe(entry, tmp, &file->event_list, list) {
 494                 if (entry->counter)
 495                         list_del(&entry->obj_list);
 496                 kfree(entry);
 497         }
 498         spin_unlock_irq(&file->lock);
 499         if (!closed_already) {
 500                 list_del(&file->list);
 501                 if (file->is_async)
 502                         ib_unregister_event_handler(&file->uverbs_file->
 503                                 event_handler);
 504         }
 505         mutex_unlock(&file->uverbs_file->device->lists_mutex);
 506
 507         kref_put(&file->uverbs_file->ref, ib_uverbs_release_file);
 508         kref_put(&file->ref, ib_uverbs_release_event_file);
 509
 510         return 0;
 511 }
 512
 513 static const struct file_operations uverbs_event_fops = {
 514         .owner   = THIS_MODULE,
 515         .read    = ib_uverbs_event_read,
 516         .poll    = ib_uverbs_event_poll,
 517         .release = ib_uverbs_event_close,
 518         .fasync  = ib_uverbs_event_fasync,
 519         .llseek  = no_llseek,
 520 };
 521
 522 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 523 {
 524         struct ib_uverbs_event_file    *file = cq_context;
 525         struct ib_ucq_object           *uobj;
 526         struct ib_uverbs_event         *entry;
 527         unsigned long                   flags;
 528
 529         if (!file)
 530                 return;
 531
 532         spin_lock_irqsave(&file->lock, flags);
 533         if (file->is_closed) {
 534                 spin_unlock_irqrestore(&file->lock, flags);
 535                 return;
 536         }
 537
 538         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 539         if (!entry) {
 540                 spin_unlock_irqrestore(&file->lock, flags);
 541                 return;
 542         }
 543
 544         uobj = container_of(cq->uobject, struct ib_ucq_object, uobject);
 545
 546         entry->desc.comp.cq_handle = cq->uobject->user_handle;
 547         entry->counter             = &uobj->comp_events_reported;
 548
 549         list_add_tail(&entry->list, &file->event_list);
 550         list_add_tail(&entry->obj_list, &uobj->comp_list);
 551         spin_unlock_irqrestore(&file->lock, flags);
 552
 553         wake_up_interruptible(&file->poll_wait);
 554         kill_fasync(&file->async_queue, SIGIO, POLL_IN);
 555 }
 556
 557 static void ib_uverbs_async_handler(struct ib_uverbs_file *file,
 558                                     __u64 element, __u64 event,
 559                                     struct list_head *obj_list,
 560                                     u32 *counter)
 561 {
 562         struct ib_uverbs_event *entry;
 563         unsigned long flags;
 564
 565         spin_lock_irqsave(&file->async_file->lock, flags);
 566         if (file->async_file->is_closed) {
 567                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 568                 return;
 569         }
 570
 571         entry = kmalloc(sizeof *entry, GFP_ATOMIC);
 572         if (!entry) {
 573                 spin_unlock_irqrestore(&file->async_file->lock, flags);
 574                 return;
 575         }
 576
 577         entry->desc.async.element    = element;
 578         entry->desc.async.event_type = event;
 579         entry->desc.async.reserved   = 0;
 580         entry->counter               = counter;
 581
 582         list_add_tail(&entry->list, &file->async_file->event_list);
 583         if (obj_list)
 584                 list_add_tail(&entry->obj_list, obj_list);
 585         spin_unlock_irqrestore(&file->async_file->lock, flags);
 586
 587         wake_up_interruptible(&file->async_file->poll_wait);
 588         kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN);
 589 }
 590
 591 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 592 {
 593         struct ib_ucq_object *uobj = container_of(event->element.cq->uobject,
 594                                                   struct ib_ucq_object, uobject);
 595
 596         ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle,
 597                                 event->event, &uobj->async_list,
 598                                 &uobj->async_events_reported);
 599 }
 600
 601 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 602 {
 603         struct ib_uevent_object *uobj;
 604
 605         /* for XRC target qp's, check that qp is live */
 606         if (!event->element.qp->uobject || !event->element.qp->uobject->live)
 607                 return;
 608
 609         uobj = container_of(event->element.qp->uobject,
 610                             struct ib_uevent_object, uobject);
 611
 612         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 613                                 event->event, &uobj->event_list,
 614                                 &uobj->events_reported);
 615 }
 616
 617 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 618 {
 619         struct ib_uevent_object *uobj = container_of(event->element.wq->uobject,
 620                                                   struct ib_uevent_object, uobject);
 621
 622         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 623                                 event->event, &uobj->event_list,
 624                                 &uobj->events_reported);
 625 }
 626
 627 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 628 {
 629         struct ib_uevent_object *uobj;
 630
 631         uobj = container_of(event->element.srq->uobject,
 632                             struct ib_uevent_object, uobject);
 633
 634         ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle,
 635                                 event->event, &uobj->event_list,
 636                                 &uobj->events_reported);
 637 }
 638
 639 void ib_uverbs_event_handler(struct ib_event_handler *handler,
 640                              struct ib_event *event)
 641 {
 642         struct ib_uverbs_file *file =
 643                 container_of(handler, struct ib_uverbs_file, event_handler);
 644
 645         ib_uverbs_async_handler(file, event->element.port_num, event->event,
 646                                 NULL, NULL);
 647 }
 648
 649 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file)
 650 {
 651         kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
 652         file->async_file = NULL;
 653 }
 654
 655 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file,
 656                                         struct ib_device        *ib_dev,
 657                                         int is_async)
 658 {
 659         struct ib_uverbs_event_file *ev_file;
 660         struct file *filp;
 661         int ret;
 662
 663         ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL);
 664         if (!ev_file)
 665                 return ERR_PTR(-ENOMEM);
 666
 667         kref_init(&ev_file->ref);
 668         spin_lock_init(&ev_file->lock);
 669         INIT_LIST_HEAD(&ev_file->event_list);
 670         init_waitqueue_head(&ev_file->poll_wait);
 671         ev_file->uverbs_file = uverbs_file;
 672         kref_get(&ev_file->uverbs_file->ref);
 673         ev_file->async_queue = NULL;
 674         ev_file->is_closed   = 0;
 675
 676         filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops,
 677                                   ev_file, O_RDONLY);
 678         if (IS_ERR(filp))
 679                 goto err_put_refs;
 680
 681         mutex_lock(&uverbs_file->device->lists_mutex);
 682         list_add_tail(&ev_file->list,
 683                       &uverbs_file->device->uverbs_events_file_list);
 684         mutex_unlock(&uverbs_file->device->lists_mutex);
 685
 686         if (is_async) {
 687                 WARN_ON(uverbs_file->async_file);
 688                 uverbs_file->async_file = ev_file;
 689                 kref_get(&uverbs_file->async_file->ref);
 690                 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler,
 691                                       ib_dev,
 692                                       ib_uverbs_event_handler);
 693                 ret = ib_register_event_handler(&uverbs_file->event_handler);
 694                 if (ret)
 695                         goto err_put_file;
 696
 697                 /* At that point async file stuff was fully set */
 698                 ev_file->is_async = 1;
 699         }
 700
 701         return filp;
 702
 703 err_put_file:
 704         fput(filp);
 705         kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file);
 706         uverbs_file->async_file = NULL;
 707         return ERR_PTR(ret);
 708
 709 err_put_refs:
 710         kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file);
 711         kref_put(&ev_file->ref, ib_uverbs_release_event_file);
 712         return filp;
 713 }
 714
 715 /*
 716  * Look up a completion event file by FD.  If lookup is successful,
 717  * takes a ref to the event file struct that it returns; if
 718  * unsuccessful, returns NULL.
 719  */
 720 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd)
 721 {
 722         struct ib_uverbs_event_file *ev_file = NULL;
 723         struct fd f = fdget(fd);
 724
 725         if (!f.file)
 726                 return NULL;
 727
 728         if (f.file->f_op != &uverbs_event_fops)
 729                 goto out;
 730
 731         ev_file = f.file->private_data;
 732         if (ev_file->is_async) {
 733                 ev_file = NULL;
 734                 goto out;
 735         }
 736
 737         kref_get(&ev_file->ref);
 738
 739 out:
 740         fdput(f);
 741         return ev_file;
 742 }
 743
 744 static int verify_command_mask(struct ib_device *ib_dev, __u32 command)
 745 {
 746         u64 mask;
 747
 748         if (command <= IB_USER_VERBS_CMD_OPEN_QP)
 749                 mask = ib_dev->uverbs_cmd_mask;
 750         else
 751                 mask = ib_dev->uverbs_ex_cmd_mask;
 752
 753         if (mask & ((u64)1 << command))
 754                 return 0;
 755
 756         return -1;
 757 }
 758
 759 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 760                              size_t count, loff_t *pos)
 761 {
 762         struct ib_uverbs_file *file = filp->private_data;
 763         struct ib_device *ib_dev;
 764         struct ib_uverbs_cmd_hdr hdr;
 765         __u32 command;
 766         __u32 flags;
 767         int srcu_key;
 768         ssize_t ret;
 769
 770         if (!ib_safe_file_access(filp)) {
 771                 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 772                             task_tgid_vnr(current), current->comm);
 773                 return -EACCES;
 774         }
 775
 776         if (count < sizeof hdr)
 777                 return -EINVAL;
 778
 779         if (copy_from_user(&hdr, buf, sizeof hdr))
 780                 return -EFAULT;
 781
 782         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 783         ib_dev = srcu_dereference(file->device->ib_dev,
 784                                   &file->device->disassociate_srcu);
 785         if (!ib_dev) {
 786                 ret = -EIO;
 787                 goto out;
 788         }
 789
 790         if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK |
 791                                    IB_USER_VERBS_CMD_COMMAND_MASK)) {
 792                 ret = -EINVAL;
 793                 goto out;
 794         }
 795
 796         command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK;
 797         if (verify_command_mask(ib_dev, command)) {
 798                 ret = -EOPNOTSUPP;
 799                 goto out;
 800         }
 801
 802         if (!file->ucontext &&
 803             command != IB_USER_VERBS_CMD_GET_CONTEXT) {
 804                 ret = -EINVAL;
 805                 goto out;
 806         }
 807
 808         flags = (hdr.command &
 809                  IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT;
 810
 811         if (!flags) {
 812                 if (command >= ARRAY_SIZE(uverbs_cmd_table) ||
 813                     !uverbs_cmd_table[command]) {
 814                         ret = -EINVAL;
 815                         goto out;
 816                 }
 817
 818                 if (hdr.in_words * 4 != count) {
 819                         ret = -EINVAL;
 820                         goto out;
 821                 }
 822
 823                 ret = uverbs_cmd_table[command](file, ib_dev,
 824                                                  buf + sizeof(hdr),
 825                                                  hdr.in_words * 4,
 826                                                  hdr.out_words * 4);
 827
 828         } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) {
 829                 struct ib_uverbs_ex_cmd_hdr ex_hdr;
 830                 struct ib_udata ucore;
 831                 struct ib_udata uhw;
 832                 size_t written_count = count;
 833
 834                 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) ||
 835                     !uverbs_ex_cmd_table[command]) {
 836                         ret = -ENOSYS;
 837                         goto out;
 838                 }
 839
 840                 if (!file->ucontext) {
 841                         ret = -EINVAL;
 842                         goto out;
 843                 }
 844
 845                 if (count < (sizeof(hdr) + sizeof(ex_hdr))) {
 846                         ret = -EINVAL;
 847                         goto out;
 848                 }
 849
 850                 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) {
 851                         ret = -EFAULT;
 852                         goto out;
 853                 }
 854
 855                 count -= sizeof(hdr) + sizeof(ex_hdr);
 856                 buf += sizeof(hdr) + sizeof(ex_hdr);
 857
 858                 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) {
 859                         ret = -EINVAL;
 860                         goto out;
 861                 }
 862
 863                 if (ex_hdr.cmd_hdr_reserved) {
 864                         ret = -EINVAL;
 865                         goto out;
 866                 }
 867
 868                 if (ex_hdr.response) {
 869                         if (!hdr.out_words && !ex_hdr.provider_out_words) {
 870                                 ret = -EINVAL;
 871                                 goto out;
 872                         }
 873
 874                         if (!access_ok(VERIFY_WRITE,
 875                                        (void __user *) (unsigned long) ex_hdr.response,
 876                                        (hdr.out_words + ex_hdr.provider_out_words) * 8)) {
 877                                 ret = -EFAULT;
 878                                 goto out;
 879                         }
 880                 } else {
 881                         if (hdr.out_words || ex_hdr.provider_out_words) {
 882                                 ret = -EINVAL;
 883                                 goto out;
 884                         }
 885                 }
 886
 887                 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response,
 888                                        hdr.in_words * 8, hdr.out_words * 8);
 889
 890                 INIT_UDATA_BUF_OR_NULL(&uhw,
 891                                        buf + ucore.inlen,
 892                                        (unsigned long) ex_hdr.response + ucore.outlen,
 893                                        ex_hdr.provider_in_words * 8,
 894                                        ex_hdr.provider_out_words * 8);
 895
 896                 ret = uverbs_ex_cmd_table[command](file,
 897                                                    ib_dev,
 898                                                    &ucore,
 899                                                    &uhw);
 900                 if (!ret)
 901                         ret = written_count;
 902         } else {
 903                 ret = -ENOSYS;
 904         }
 905
 906 out:
 907         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 908         return ret;
 909 }
 910
 911 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 912 {
 913         struct ib_uverbs_file *file = filp->private_data;
 914         struct ib_device *ib_dev;
 915         int ret = 0;
 916         int srcu_key;
 917
 918         srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 919         ib_dev = srcu_dereference(file->device->ib_dev,
 920                                   &file->device->disassociate_srcu);
 921         if (!ib_dev) {
 922                 ret = -EIO;
 923                 goto out;
 924         }
 925
 926         if (!file->ucontext)
 927                 ret = -ENODEV;
 928         else
 929                 ret = ib_dev->mmap(file->ucontext, vma);
 930 out:
 931         srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 932         return ret;
 933 }
 934
 935 /*
 936  * ib_uverbs_open() does not need the BKL:
 937  *
 938  *  - the ib_uverbs_device structures are properly reference counted and
 939  *    everything else is purely local to the file being created, so
 940  *    races against other open calls are not a problem;
 941  *  - there is no ioctl method to race against;
 942  *  - the open method will either immediately run -ENXIO, or all
 943  *    required initialization will be done.
 944  */
 945 static int ib_uverbs_open(struct inode *inode, struct file *filp)
 946 {
 947         struct ib_uverbs_device *dev;
 948         struct ib_uverbs_file *file;
 949         struct ib_device *ib_dev;
 950         int ret;
 951         int module_dependent;
 952         int srcu_key;
 953
 954         dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 955         if (!atomic_inc_not_zero(&dev->refcount))
 956                 return -ENXIO;
 957
 958         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 959         mutex_lock(&dev->lists_mutex);
 960         ib_dev = srcu_dereference(dev->ib_dev,
 961                                   &dev->disassociate_srcu);
 962         if (!ib_dev) {
 963                 ret = -EIO;
 964                 goto err;
 965         }
 966
 967         /* In case IB device supports disassociate ucontext, there is no hard
 968          * dependency between uverbs device and its low level device.
 969          */
 970         module_dependent = !(ib_dev->disassociate_ucontext);
 971
 972         if (module_dependent) {
 973                 if (!try_module_get(ib_dev->owner)) {
 974                         ret = -ENODEV;
 975                         goto err;
 976                 }
 977         }
 978
 979         file = kzalloc(sizeof(*file), GFP_KERNEL);
 980         if (!file) {
 981                 ret = -ENOMEM;
 982                 if (module_dependent)
 983                         goto err_module;
 984
 985                 goto err;
 986         }
 987
 988         file->device     = dev;
 989         file->ucontext   = NULL;
 990         file->async_file = NULL;
 991         kref_init(&file->ref);
 992         mutex_init(&file->mutex);
 993         mutex_init(&file->cleanup_mutex);
 994
 995         filp->private_data = file;
 996         kobject_get(&dev->kobj);
 997         list_add_tail(&file->list, &dev->uverbs_file_list);
 998         mutex_unlock(&dev->lists_mutex);
 999         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1000
1001         return nonseekable_open(inode, filp);
1002
1003 err_module:
1004         module_put(ib_dev->owner);
1005
1006 err:
1007         mutex_unlock(&dev->lists_mutex);
1008         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1009         if (atomic_dec_and_test(&dev->refcount))
1010                 ib_uverbs_comp_dev(dev);
1011
1012         return ret;
1013 }
1014
1015 static int ib_uverbs_close(struct inode *inode, struct file *filp)
1016 {
1017         struct ib_uverbs_file *file = filp->private_data;
1018         struct ib_uverbs_device *dev = file->device;
1019
1020         mutex_lock(&file->cleanup_mutex);
1021         if (file->ucontext) {
1022                 ib_uverbs_cleanup_ucontext(file, file->ucontext);
1023                 file->ucontext = NULL;
1024         }
1025         mutex_unlock(&file->cleanup_mutex);
1026
1027         mutex_lock(&file->device->lists_mutex);
1028         if (!file->is_closed) {
1029                 list_del(&file->list);
1030                 file->is_closed = 1;
1031         }
1032         mutex_unlock(&file->device->lists_mutex);
1033
1034         if (file->async_file)
1035                 kref_put(&file->async_file->ref, ib_uverbs_release_event_file);
1036
1037         kref_put(&file->ref, ib_uverbs_release_file);
1038         kobject_put(&dev->kobj);
1039
1040         return 0;
1041 }
1042
1043 static const struct file_operations uverbs_fops = {
1044         .owner   = THIS_MODULE,
1045         .write   = ib_uverbs_write,
1046         .open    = ib_uverbs_open,
1047         .release = ib_uverbs_close,
1048         .llseek  = no_llseek,
1049 };
1050
1051 static const struct file_operations uverbs_mmap_fops = {
1052         .owner   = THIS_MODULE,
1053         .write   = ib_uverbs_write,
1054         .mmap    = ib_uverbs_mmap,
1055         .open    = ib_uverbs_open,
1056         .release = ib_uverbs_close,
1057         .llseek  = no_llseek,
1058 };
1059
1060 static struct ib_client uverbs_client = {
1061         .name   = "uverbs",
1062         .add    = ib_uverbs_add_one,
1063         .remove = ib_uverbs_remove_one
1064 };
1065
1066 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr,
1067                           char *buf)
1068 {
1069         int ret = -ENODEV;
1070         int srcu_key;
1071         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1072         struct ib_device *ib_dev;
1073
1074         if (!dev)
1075                 return -ENODEV;
1076
1077         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1078         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1079         if (ib_dev)
1080                 ret = sprintf(buf, "%s\n", ib_dev->name);
1081         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1082
1083         return ret;
1084 }
1085 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL);
1086
1087 static ssize_t show_dev_abi_version(struct device *device,
1088                                     struct device_attribute *attr, char *buf)
1089 {
1090         struct ib_uverbs_device *dev = dev_get_drvdata(device);
1091         int ret = -ENODEV;
1092         int srcu_key;
1093         struct ib_device *ib_dev;
1094
1095         if (!dev)
1096                 return -ENODEV;
1097         srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1098         ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1099         if (ib_dev)
1100                 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver);
1101         srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1102
1103         return ret;
1104 }
1105 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL);
1106
1107 static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1108                          __stringify(IB_USER_VERBS_ABI_VERSION));
1109
1110 static dev_t overflow_maj;
1111 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES);
1112
1113 /*
1114  * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by
1115  * requesting a new major number and doubling the number of max devices we
1116  * support. It's stupid, but simple.
1117  */
1118 static int find_overflow_devnum(void)
1119 {
1120         int ret;
1121
1122         if (!overflow_maj) {
1123                 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES,
1124                                           "infiniband_verbs");
1125                 if (ret) {
1126                         pr_err("user_verbs: couldn't register dynamic device number\n");
1127                         return ret;
1128                 }
1129         }
1130
1131         ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES);
1132         if (ret >= IB_UVERBS_MAX_DEVICES)
1133                 return -1;
1134
1135         return ret;
1136 }
1137
1138 static void ib_uverbs_add_one(struct ib_device *device)
1139 {
1140         int devnum;
1141         dev_t base;
1142         struct ib_uverbs_device *uverbs_dev;
1143         int ret;
1144
1145         if (!device->alloc_ucontext)
1146                 return;
1147
1148         uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL);
1149         if (!uverbs_dev)
1150                 return;
1151
1152         ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1153         if (ret) {
1154                 kfree(uverbs_dev);
1155                 return;
1156         }
1157
1158         atomic_set(&uverbs_dev->refcount, 1);
1159         init_completion(&uverbs_dev->comp);
1160         uverbs_dev->xrcd_tree = RB_ROOT;
1161         mutex_init(&uverbs_dev->xrcd_tree_mutex);
1162         kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype);
1163         mutex_init(&uverbs_dev->lists_mutex);
1164         INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1165         INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list);
1166
1167         spin_lock(&map_lock);
1168         devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES);
1169         if (devnum >= IB_UVERBS_MAX_DEVICES) {
1170                 spin_unlock(&map_lock);
1171                 devnum = find_overflow_devnum();
1172                 if (devnum < 0)
1173                         goto err;
1174
1175                 spin_lock(&map_lock);
1176                 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES;
1177                 base = devnum + overflow_maj;
1178                 set_bit(devnum, overflow_map);
1179         } else {
1180                 uverbs_dev->devnum = devnum;
1181                 base = devnum + IB_UVERBS_BASE_DEV;
1182                 set_bit(devnum, dev_map);
1183         }
1184         spin_unlock(&map_lock);
1185
1186         rcu_assign_pointer(uverbs_dev->ib_dev, device);
1187         uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1188
1189         cdev_init(&uverbs_dev->cdev, NULL);
1190         uverbs_dev->cdev.owner = THIS_MODULE;
1191         uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops;
1192         uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj;
1193         kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum);
1194         if (cdev_add(&uverbs_dev->cdev, base, 1))
1195                 goto err_cdev;
1196
1197         uverbs_dev->dev = device_create(uverbs_class, device->dev.parent,
1198                                         uverbs_dev->cdev.dev, uverbs_dev,
1199                                         "uverbs%d", uverbs_dev->devnum);
1200         if (IS_ERR(uverbs_dev->dev))
1201                 goto err_cdev;
1202
1203         if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev))
1204                 goto err_class;
1205         if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version))
1206                 goto err_class;
1207
1208         ib_set_client_data(device, &uverbs_client, uverbs_dev);
1209
1210         return;
1211
1212 err_class:
1213         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1214
1215 err_cdev:
1216         cdev_del(&uverbs_dev->cdev);
1217         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1218                 clear_bit(devnum, dev_map);
1219         else
1220                 clear_bit(devnum, overflow_map);
1221
1222 err:
1223         if (atomic_dec_and_test(&uverbs_dev->refcount))
1224                 ib_uverbs_comp_dev(uverbs_dev);
1225         wait_for_completion(&uverbs_dev->comp);
1226         kobject_put(&uverbs_dev->kobj);
1227         return;
1228 }
1229
1230 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1231                                         struct ib_device *ib_dev)
1232 {
1233         struct ib_uverbs_file *file;
1234         struct ib_uverbs_event_file *event_file;
1235         struct ib_event event;
1236
1237         /* Pending running commands to terminate */
1238         synchronize_srcu(&uverbs_dev->disassociate_srcu);
1239         event.event = IB_EVENT_DEVICE_FATAL;
1240         event.element.port_num = 0;
1241         event.device = ib_dev;
1242
1243         mutex_lock(&uverbs_dev->lists_mutex);
1244         while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1245                 struct ib_ucontext *ucontext;
1246                 file = list_first_entry(&uverbs_dev->uverbs_file_list,
1247                                         struct ib_uverbs_file, list);
1248                 file->is_closed = 1;
1249                 list_del(&file->list);
1250                 kref_get(&file->ref);
1251                 mutex_unlock(&uverbs_dev->lists_mutex);
1252
1253                 ib_uverbs_event_handler(&file->event_handler, &event);
1254
1255                 mutex_lock(&file->cleanup_mutex);
1256                 ucontext = file->ucontext;
1257                 file->ucontext = NULL;
1258                 mutex_unlock(&file->cleanup_mutex);
1259
1260                 /* At this point ib_uverbs_close cannot be running
1261                  * ib_uverbs_cleanup_ucontext
1262                  */
1263                 if (ucontext) {
1264                         /* We must release the mutex before going ahead and
1265                          * calling disassociate_ucontext. disassociate_ucontext
1266                          * might end up indirectly calling uverbs_close,
1267                          * for example due to freeing the resources
1268                          * (e.g mmput).
1269                          */
1270                         ib_dev->disassociate_ucontext(ucontext);
1271                         ib_uverbs_cleanup_ucontext(file, ucontext);
1272                 }
1273
1274                 mutex_lock(&uverbs_dev->lists_mutex);
1275                 kref_put(&file->ref, ib_uverbs_release_file);
1276         }
1277
1278         while (!list_empty(&uverbs_dev->uverbs_events_file_list)) {
1279                 event_file = list_first_entry(&uverbs_dev->
1280                                               uverbs_events_file_list,
1281                                               struct ib_uverbs_event_file,
1282                                               list);
1283                 spin_lock_irq(&event_file->lock);
1284                 event_file->is_closed = 1;
1285                 spin_unlock_irq(&event_file->lock);
1286
1287                 list_del(&event_file->list);
1288                 if (event_file->is_async) {
1289                         ib_unregister_event_handler(&event_file->uverbs_file->
1290                                                     event_handler);
1291                         event_file->uverbs_file->event_handler.device = NULL;
1292                 }
1293
1294                 wake_up_interruptible(&event_file->poll_wait);
1295                 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN);
1296         }
1297         mutex_unlock(&uverbs_dev->lists_mutex);
1298 }
1299
1300 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1301 {
1302         struct ib_uverbs_device *uverbs_dev = client_data;
1303         int wait_clients = 1;
1304
1305         if (!uverbs_dev)
1306                 return;
1307
1308         dev_set_drvdata(uverbs_dev->dev, NULL);
1309         device_destroy(uverbs_class, uverbs_dev->cdev.dev);
1310         cdev_del(&uverbs_dev->cdev);
1311
1312         if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES)
1313                 clear_bit(uverbs_dev->devnum, dev_map);
1314         else
1315                 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map);
1316
1317         if (device->disassociate_ucontext) {
1318                 /* We disassociate HW resources and immediately return.
1319                  * Userspace will see a EIO errno for all future access.
1320                  * Upon returning, ib_device may be freed internally and is not
1321                  * valid any more.
1322                  * uverbs_device is still available until all clients close
1323                  * their files, then the uverbs device ref count will be zero
1324                  * and its resources will be freed.
1325                  * Note: At this point no more files can be opened since the
1326                  * cdev was deleted, however active clients can still issue
1327                  * commands and close their open files.
1328                  */
1329                 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
1330                 ib_uverbs_free_hw_resources(uverbs_dev, device);
1331                 wait_clients = 0;
1332         }
1333
1334         if (atomic_dec_and_test(&uverbs_dev->refcount))
1335                 ib_uverbs_comp_dev(uverbs_dev);
1336         if (wait_clients)
1337                 wait_for_completion(&uverbs_dev->comp);
1338         kobject_put(&uverbs_dev->kobj);
1339 }
1340
1341 static char *uverbs_devnode(struct device *dev, umode_t *mode)
1342 {
1343         if (mode)
1344                 *mode = 0666;
1345         return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
1346 }
1347
1348 static int __init ib_uverbs_init(void)
1349 {
1350         int ret;
1351
1352         ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES,
1353                                      "infiniband_verbs");
1354         if (ret) {
1355                 pr_err("user_verbs: couldn't register device number\n");
1356                 goto out;
1357         }
1358
1359         uverbs_class = class_create(THIS_MODULE, "infiniband_verbs");
1360         if (IS_ERR(uverbs_class)) {
1361                 ret = PTR_ERR(uverbs_class);
1362                 pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1363                 goto out_chrdev;
1364         }
1365
1366         uverbs_class->devnode = uverbs_devnode;
1367
1368         ret = class_create_file(uverbs_class, &class_attr_abi_version.attr);
1369         if (ret) {
1370                 pr_err("user_verbs: couldn't create abi_version attribute\n");
1371                 goto out_class;
1372         }
1373
1374         ret = ib_register_client(&uverbs_client);
1375         if (ret) {
1376                 pr_err("user_verbs: couldn't register client\n");
1377                 goto out_class;
1378         }
1379
1380         return 0;
1381
1382 out_class:
1383         class_destroy(uverbs_class);
1384
1385 out_chrdev:
1386         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1387
1388 out:
1389         return ret;
1390 }
1391
1392 static void __exit ib_uverbs_cleanup(void)
1393 {
1394         ib_unregister_client(&uverbs_client);
1395         class_destroy(uverbs_class);
1396         unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES);
1397         if (overflow_maj)
1398                 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES);
1399         idr_destroy(&ib_uverbs_pd_idr);
1400         idr_destroy(&ib_uverbs_mr_idr);
1401         idr_destroy(&ib_uverbs_mw_idr);
1402         idr_destroy(&ib_uverbs_ah_idr);
1403         idr_destroy(&ib_uverbs_cq_idr);
1404         idr_destroy(&ib_uverbs_qp_idr);
1405         idr_destroy(&ib_uverbs_srq_idr);
1406 }
1407
1408 module_init(ib_uverbs_init);
1409 module_exit(ib_uverbs_cleanup);