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#include <linux/sched/mm.h>
  49
  50#include <linux/uaccess.h>
  51
  52#include <rdma/ib.h>
  53#include <rdma/uverbs_std_types.h>
  54#include <rdma/rdma_netlink.h>
  55
  56#include "uverbs.h"
  57#include "core_priv.h"
  58#include "rdma_core.h"
  59
  60MODULE_AUTHOR("Roland Dreier");
  61MODULE_DESCRIPTION("InfiniBand userspace verbs access");
  62MODULE_LICENSE("Dual BSD/GPL");
  63
  64enum {
  65	IB_UVERBS_MAJOR       = 231,
  66	IB_UVERBS_BASE_MINOR  = 192,
  67	IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS,
  68	IB_UVERBS_NUM_FIXED_MINOR = 32,
  69	IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR,
  70};
  71
  72#define IB_UVERBS_BASE_DEV	MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR)
  73
  74static dev_t dynamic_uverbs_dev;
 
  75
  76static DEFINE_IDA(uverbs_ida);
  77static int ib_uverbs_add_one(struct ib_device *device);
  78static void ib_uverbs_remove_one(struct ib_device *device, void *client_data);
  79static struct ib_client uverbs_client;
  80
  81static char *uverbs_devnode(const struct device *dev, umode_t *mode)
  82{
  83	if (mode)
  84		*mode = 0666;
  85	return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
  86}
  87
  88static const struct class uverbs_class = {
  89	.name = "infiniband_verbs",
  90	.devnode = uverbs_devnode,
  91};
  92
  93/*
  94 * Must be called with the ufile->device->disassociate_srcu held, and the lock
  95 * must be held until use of the ucontext is finished.
  96 */
  97struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
  98{
  99	/*
 100	 * We do not hold the hw_destroy_rwsem lock for this flow, instead
 101	 * srcu is used. It does not matter if someone races this with
 102	 * get_context, we get NULL or valid ucontext.
 103	 */
 104	struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
 105
 106	if (!srcu_dereference(ufile->device->ib_dev,
 107			      &ufile->device->disassociate_srcu))
 108		return ERR_PTR(-EIO);
 109
 110	if (!ucontext)
 111		return ERR_PTR(-EINVAL);
 112
 113	return ucontext;
 114}
 115EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
 116
 117int uverbs_dealloc_mw(struct ib_mw *mw)
 118{
 119	struct ib_pd *pd = mw->pd;
 120	int ret;
 121
 122	ret = mw->device->ops.dealloc_mw(mw);
 123	if (ret)
 124		return ret;
 125
 126	atomic_dec(&pd->usecnt);
 127	kfree(mw);
 128	return ret;
 129}
 130
 131static void ib_uverbs_release_dev(struct device *device)
 132{
 133	struct ib_uverbs_device *dev =
 134			container_of(device, struct ib_uverbs_device, dev);
 135
 136	uverbs_destroy_api(dev->uapi);
 137	cleanup_srcu_struct(&dev->disassociate_srcu);
 138	mutex_destroy(&dev->lists_mutex);
 139	mutex_destroy(&dev->xrcd_tree_mutex);
 140	kfree(dev);
 141}
 142
 143void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
 144			   struct ib_ucq_object *uobj)
 145{
 146	struct ib_uverbs_event *evt, *tmp;
 147
 148	if (ev_file) {
 149		spin_lock_irq(&ev_file->ev_queue.lock);
 150		list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 151			list_del(&evt->list);
 152			kfree(evt);
 153		}
 154		spin_unlock_irq(&ev_file->ev_queue.lock);
 155
 156		uverbs_uobject_put(&ev_file->uobj);
 157	}
 158
 159	ib_uverbs_release_uevent(&uobj->uevent);
 160}
 161
 162void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
 163{
 164	struct ib_uverbs_async_event_file *async_file = uobj->event_file;
 165	struct ib_uverbs_event *evt, *tmp;
 166
 167	if (!async_file)
 168		return;
 169
 170	spin_lock_irq(&async_file->ev_queue.lock);
 171	list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 172		list_del(&evt->list);
 173		kfree(evt);
 174	}
 175	spin_unlock_irq(&async_file->ev_queue.lock);
 176	uverbs_uobject_put(&async_file->uobj);
 177}
 178
 179void ib_uverbs_detach_umcast(struct ib_qp *qp,
 180			     struct ib_uqp_object *uobj)
 181{
 182	struct ib_uverbs_mcast_entry *mcast, *tmp;
 183
 184	list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 185		ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 186		list_del(&mcast->list);
 187		kfree(mcast);
 188	}
 189}
 190
 191static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 192{
 193	complete(&dev->comp);
 194}
 195
 196void ib_uverbs_release_file(struct kref *ref)
 197{
 198	struct ib_uverbs_file *file =
 199		container_of(ref, struct ib_uverbs_file, ref);
 200	struct ib_device *ib_dev;
 201	int srcu_key;
 202
 203	release_ufile_idr_uobject(file);
 204
 205	srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 206	ib_dev = srcu_dereference(file->device->ib_dev,
 207				  &file->device->disassociate_srcu);
 208	if (ib_dev && !ib_dev->ops.disassociate_ucontext)
 209		module_put(ib_dev->ops.owner);
 210	srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 211
 212	if (refcount_dec_and_test(&file->device->refcount))
 213		ib_uverbs_comp_dev(file->device);
 214
 215	if (file->default_async_file)
 216		uverbs_uobject_put(&file->default_async_file->uobj);
 217	put_device(&file->device->dev);
 218
 219	if (file->disassociate_page)
 220		__free_pages(file->disassociate_page, 0);
 221	mutex_destroy(&file->disassociation_lock);
 222	mutex_destroy(&file->umap_lock);
 223	mutex_destroy(&file->ucontext_lock);
 224	kfree(file);
 225}
 226
 227static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 228				    struct file *filp, char __user *buf,
 229				    size_t count, loff_t *pos,
 230				    size_t eventsz)
 231{
 232	struct ib_uverbs_event *event;
 233	int ret = 0;
 234
 235	spin_lock_irq(&ev_queue->lock);
 236
 237	while (list_empty(&ev_queue->event_list)) {
 238		if (ev_queue->is_closed) {
 239			spin_unlock_irq(&ev_queue->lock);
 240			return -EIO;
 241		}
 242
 243		spin_unlock_irq(&ev_queue->lock);
 
 244		if (filp->f_flags & O_NONBLOCK)
 245			return -EAGAIN;
 246
 247		if (wait_event_interruptible(ev_queue->poll_wait,
 248					     (!list_empty(&ev_queue->event_list) ||
 249					      ev_queue->is_closed)))
 250			return -ERESTARTSYS;
 251
 252		spin_lock_irq(&ev_queue->lock);
 
 
 
 
 
 
 253	}
 254
 255	event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 256
 257	if (eventsz > count) {
 258		ret   = -EINVAL;
 259		event = NULL;
 260	} else {
 261		list_del(ev_queue->event_list.next);
 262		if (event->counter) {
 263			++(*event->counter);
 264			list_del(&event->obj_list);
 265		}
 266	}
 267
 268	spin_unlock_irq(&ev_queue->lock);
 269
 270	if (event) {
 271		if (copy_to_user(buf, event, eventsz))
 272			ret = -EFAULT;
 273		else
 274			ret = eventsz;
 275	}
 276
 277	kfree(event);
 278
 279	return ret;
 280}
 281
 282static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 283					  size_t count, loff_t *pos)
 284{
 285	struct ib_uverbs_async_event_file *file = filp->private_data;
 286
 287	return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
 288				    sizeof(struct ib_uverbs_async_event_desc));
 289}
 290
 291static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 292					 size_t count, loff_t *pos)
 293{
 294	struct ib_uverbs_completion_event_file *comp_ev_file =
 295		filp->private_data;
 296
 297	return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
 298				    pos,
 299				    sizeof(struct ib_uverbs_comp_event_desc));
 300}
 301
 302static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 303					 struct file *filp,
 304					 struct poll_table_struct *wait)
 305{
 306	__poll_t pollflags = 0;
 307
 308	poll_wait(filp, &ev_queue->poll_wait, wait);
 309
 310	spin_lock_irq(&ev_queue->lock);
 311	if (!list_empty(&ev_queue->event_list))
 312		pollflags = EPOLLIN | EPOLLRDNORM;
 313	else if (ev_queue->is_closed)
 314		pollflags = EPOLLERR;
 315	spin_unlock_irq(&ev_queue->lock);
 316
 317	return pollflags;
 318}
 319
 320static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 321					       struct poll_table_struct *wait)
 322{
 323	struct ib_uverbs_async_event_file *file = filp->private_data;
 324
 325	return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
 326}
 327
 328static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 329					      struct poll_table_struct *wait)
 330{
 331	struct ib_uverbs_completion_event_file *comp_ev_file =
 332		filp->private_data;
 333
 334	return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 335}
 336
 337static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 338{
 339	struct ib_uverbs_async_event_file *file = filp->private_data;
 340
 341	return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
 342}
 343
 344static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 345{
 346	struct ib_uverbs_completion_event_file *comp_ev_file =
 347		filp->private_data;
 348
 349	return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 350}
 351
 352const struct file_operations uverbs_event_fops = {
 353	.owner	 = THIS_MODULE,
 354	.read	 = ib_uverbs_comp_event_read,
 355	.poll    = ib_uverbs_comp_event_poll,
 356	.release = uverbs_uobject_fd_release,
 357	.fasync  = ib_uverbs_comp_event_fasync,
 
 358};
 359
 360const struct file_operations uverbs_async_event_fops = {
 361	.owner	 = THIS_MODULE,
 362	.read	 = ib_uverbs_async_event_read,
 363	.poll    = ib_uverbs_async_event_poll,
 364	.release = uverbs_async_event_release,
 365	.fasync  = ib_uverbs_async_event_fasync,
 
 366};
 367
 368void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context)
 369{
 370	struct ib_uverbs_event_queue   *ev_queue = cq_context;
 371	struct ib_ucq_object	       *uobj;
 372	struct ib_uverbs_event	       *entry;
 373	unsigned long			flags;
 374
 375	if (!ev_queue)
 376		return;
 377
 378	spin_lock_irqsave(&ev_queue->lock, flags);
 379	if (ev_queue->is_closed) {
 380		spin_unlock_irqrestore(&ev_queue->lock, flags);
 381		return;
 382	}
 383
 384	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 385	if (!entry) {
 386		spin_unlock_irqrestore(&ev_queue->lock, flags);
 387		return;
 388	}
 389
 390	uobj = cq->uobject;
 391
 392	entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle;
 393	entry->counter		   = &uobj->comp_events_reported;
 394
 395	list_add_tail(&entry->list, &ev_queue->event_list);
 396	list_add_tail(&entry->obj_list, &uobj->comp_list);
 397	spin_unlock_irqrestore(&ev_queue->lock, flags);
 398
 399	wake_up_interruptible(&ev_queue->poll_wait);
 400	kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN);
 401}
 402
 403void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file,
 404			     __u64 element, __u64 event,
 405			     struct list_head *obj_list, u32 *counter)
 406{
 407	struct ib_uverbs_event *entry;
 408	unsigned long flags;
 409
 410	if (!async_file)
 411		return;
 412
 413	spin_lock_irqsave(&async_file->ev_queue.lock, flags);
 414	if (async_file->ev_queue.is_closed) {
 415		spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 416		return;
 417	}
 418
 419	entry = kmalloc(sizeof(*entry), GFP_ATOMIC);
 420	if (!entry) {
 421		spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 422		return;
 423	}
 424
 425	entry->desc.async.element = element;
 426	entry->desc.async.event_type = event;
 427	entry->desc.async.reserved = 0;
 428	entry->counter = counter;
 429
 430	list_add_tail(&entry->list, &async_file->ev_queue.event_list);
 431	if (obj_list)
 432		list_add_tail(&entry->obj_list, obj_list);
 433	spin_unlock_irqrestore(&async_file->ev_queue.lock, flags);
 434
 435	wake_up_interruptible(&async_file->ev_queue.poll_wait);
 436	kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN);
 437}
 438
 439static void uverbs_uobj_event(struct ib_uevent_object *eobj,
 440			      struct ib_event *event)
 441{
 442	ib_uverbs_async_handler(eobj->event_file,
 443				eobj->uobject.user_handle, event->event,
 444				&eobj->event_list, &eobj->events_reported);
 445}
 446
 447void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr)
 448{
 449	uverbs_uobj_event(&event->element.cq->uobject->uevent, event);
 450}
 451
 452void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr)
 453{
 454	/* for XRC target qp's, check that qp is live */
 455	if (!event->element.qp->uobject)
 456		return;
 457
 458	uverbs_uobj_event(&event->element.qp->uobject->uevent, event);
 459}
 460
 461void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr)
 462{
 463	uverbs_uobj_event(&event->element.wq->uobject->uevent, event);
 464}
 465
 466void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr)
 467{
 468	uverbs_uobj_event(&event->element.srq->uobject->uevent, event);
 469}
 470
 471static void ib_uverbs_event_handler(struct ib_event_handler *handler,
 472				    struct ib_event *event)
 473{
 474	ib_uverbs_async_handler(
 475		container_of(handler, struct ib_uverbs_async_event_file,
 476			     event_handler),
 477		event->element.port_num, event->event, NULL, NULL);
 478}
 479
 480void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue)
 481{
 482	spin_lock_init(&ev_queue->lock);
 483	INIT_LIST_HEAD(&ev_queue->event_list);
 484	init_waitqueue_head(&ev_queue->poll_wait);
 485	ev_queue->is_closed   = 0;
 486	ev_queue->async_queue = NULL;
 487}
 488
 489void ib_uverbs_init_async_event_file(
 490	struct ib_uverbs_async_event_file *async_file)
 491{
 492	struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile;
 493	struct ib_device *ib_dev = async_file->uobj.context->device;
 494
 495	ib_uverbs_init_event_queue(&async_file->ev_queue);
 496
 497	/* The first async_event_file becomes the default one for the file. */
 498	mutex_lock(&uverbs_file->ucontext_lock);
 499	if (!uverbs_file->default_async_file) {
 500		/* Pairs with the put in ib_uverbs_release_file */
 501		uverbs_uobject_get(&async_file->uobj);
 502		smp_store_release(&uverbs_file->default_async_file, async_file);
 503	}
 504	mutex_unlock(&uverbs_file->ucontext_lock);
 505
 506	INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev,
 507			      ib_uverbs_event_handler);
 508	ib_register_event_handler(&async_file->event_handler);
 509}
 510
 511static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr,
 512			  struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count,
 513			  const struct uverbs_api_write_method *method_elm)
 514{
 515	if (method_elm->is_ex) {
 516		count -= sizeof(*hdr) + sizeof(*ex_hdr);
 517
 518		if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count)
 519			return -EINVAL;
 520
 521		if (hdr->in_words * 8 < method_elm->req_size)
 522			return -ENOSPC;
 523
 524		if (ex_hdr->cmd_hdr_reserved)
 525			return -EINVAL;
 526
 527		if (ex_hdr->response) {
 528			if (!hdr->out_words && !ex_hdr->provider_out_words)
 529				return -EINVAL;
 530
 531			if (hdr->out_words * 8 < method_elm->resp_size)
 532				return -ENOSPC;
 533
 534			if (!access_ok(u64_to_user_ptr(ex_hdr->response),
 535				       (hdr->out_words + ex_hdr->provider_out_words) * 8))
 536				return -EFAULT;
 537		} else {
 538			if (hdr->out_words || ex_hdr->provider_out_words)
 539				return -EINVAL;
 540		}
 541
 542		return 0;
 543	}
 544
 545	/* not extended command */
 546	if (hdr->in_words * 4 != count)
 547		return -EINVAL;
 548
 549	if (count < method_elm->req_size + sizeof(*hdr)) {
 550		/*
 551		 * rdma-core v18 and v19 have a bug where they send DESTROY_CQ
 552		 * with a 16 byte write instead of 24. Old kernels didn't
 553		 * check the size so they allowed this. Now that the size is
 554		 * checked provide a compatibility work around to not break
 555		 * those userspaces.
 556		 */
 557		if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ &&
 558		    count == 16) {
 559			hdr->in_words = 6;
 560			return 0;
 561		}
 562		return -ENOSPC;
 563	}
 564	if (hdr->out_words * 4 < method_elm->resp_size)
 565		return -ENOSPC;
 566
 567	return 0;
 568}
 569
 570static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf,
 571			     size_t count, loff_t *pos)
 572{
 573	struct ib_uverbs_file *file = filp->private_data;
 574	const struct uverbs_api_write_method *method_elm;
 575	struct uverbs_api *uapi = file->device->uapi;
 576	struct ib_uverbs_ex_cmd_hdr ex_hdr;
 577	struct ib_uverbs_cmd_hdr hdr;
 578	struct uverbs_attr_bundle bundle;
 579	int srcu_key;
 580	ssize_t ret;
 581
 582	if (!ib_safe_file_access(filp)) {
 583		pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n",
 584			    task_tgid_vnr(current), current->comm);
 585		return -EACCES;
 586	}
 587
 588	if (count < sizeof(hdr))
 589		return -EINVAL;
 590
 591	if (copy_from_user(&hdr, buf, sizeof(hdr)))
 592		return -EFAULT;
 593
 594	method_elm = uapi_get_method(uapi, hdr.command);
 595	if (IS_ERR(method_elm))
 596		return PTR_ERR(method_elm);
 597
 598	if (method_elm->is_ex) {
 599		if (count < (sizeof(hdr) + sizeof(ex_hdr)))
 600			return -EINVAL;
 601		if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr)))
 602			return -EFAULT;
 603	}
 604
 605	ret = verify_hdr(&hdr, &ex_hdr, count, method_elm);
 606	if (ret)
 607		return ret;
 608
 609	srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 610
 611	buf += sizeof(hdr);
 612
 613	memset(bundle.attr_present, 0, sizeof(bundle.attr_present));
 614	bundle.ufile = file;
 615	bundle.context = NULL; /* only valid if bundle has uobject */
 616	bundle.uobject = NULL;
 617	if (!method_elm->is_ex) {
 618		size_t in_len = hdr.in_words * 4 - sizeof(hdr);
 619		size_t out_len = hdr.out_words * 4;
 620		u64 response = 0;
 621
 622		if (method_elm->has_udata) {
 623			bundle.driver_udata.inlen =
 624				in_len - method_elm->req_size;
 625			in_len = method_elm->req_size;
 626			if (bundle.driver_udata.inlen)
 627				bundle.driver_udata.inbuf = buf + in_len;
 628			else
 629				bundle.driver_udata.inbuf = NULL;
 630		} else {
 631			memset(&bundle.driver_udata, 0,
 632			       sizeof(bundle.driver_udata));
 633		}
 634
 635		if (method_elm->has_resp) {
 636			/*
 637			 * The macros check that if has_resp is set
 638			 * then the command request structure starts
 639			 * with a '__aligned u64 response' member.
 640			 */
 641			ret = get_user(response, (const u64 __user *)buf);
 642			if (ret)
 643				goto out_unlock;
 644
 645			if (method_elm->has_udata) {
 646				bundle.driver_udata.outlen =
 647					out_len - method_elm->resp_size;
 648				out_len = method_elm->resp_size;
 649				if (bundle.driver_udata.outlen)
 650					bundle.driver_udata.outbuf =
 651						u64_to_user_ptr(response +
 652								out_len);
 653				else
 654					bundle.driver_udata.outbuf = NULL;
 655			}
 656		} else {
 657			bundle.driver_udata.outlen = 0;
 658			bundle.driver_udata.outbuf = NULL;
 659		}
 660
 661		ib_uverbs_init_udata_buf_or_null(
 662			&bundle.ucore, buf, u64_to_user_ptr(response),
 663			in_len, out_len);
 664	} else {
 665		buf += sizeof(ex_hdr);
 666
 667		ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf,
 668					u64_to_user_ptr(ex_hdr.response),
 669					hdr.in_words * 8, hdr.out_words * 8);
 670
 671		ib_uverbs_init_udata_buf_or_null(
 672			&bundle.driver_udata, buf + bundle.ucore.inlen,
 673			u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen,
 674			ex_hdr.provider_in_words * 8,
 675			ex_hdr.provider_out_words * 8);
 676
 677	}
 678
 679	ret = method_elm->handler(&bundle);
 680	if (bundle.uobject)
 681		uverbs_finalize_object(bundle.uobject, UVERBS_ACCESS_NEW, true,
 682				       !ret, &bundle);
 683out_unlock:
 684	srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 685	return (ret) ? : count;
 686}
 687
 688static const struct vm_operations_struct rdma_umap_ops;
 689
 690static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma)
 691{
 692	struct ib_uverbs_file *file = filp->private_data;
 693	struct ib_ucontext *ucontext;
 694	int ret = 0;
 695	int srcu_key;
 696
 697	srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 698	ucontext = ib_uverbs_get_ucontext_file(file);
 699	if (IS_ERR(ucontext)) {
 700		ret = PTR_ERR(ucontext);
 701		goto out;
 702	}
 703
 704	mutex_lock(&file->disassociation_lock);
 705
 706	vma->vm_ops = &rdma_umap_ops;
 707	ret = ucontext->device->ops.mmap(ucontext, vma);
 708
 709	mutex_unlock(&file->disassociation_lock);
 710out:
 711	srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 712	return ret;
 713}
 714
 715/*
 716 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
 717 * struct
 718 */
 719static void rdma_umap_open(struct vm_area_struct *vma)
 720{
 721	struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 722	struct rdma_umap_priv *opriv = vma->vm_private_data;
 723	struct rdma_umap_priv *priv;
 724
 725	if (!opriv)
 726		return;
 727
 728	/* We are racing with disassociation */
 729	if (!down_read_trylock(&ufile->hw_destroy_rwsem))
 730		goto out_zap;
 731	mutex_lock(&ufile->disassociation_lock);
 732
 733	/*
 734	 * Disassociation already completed, the VMA should already be zapped.
 735	 */
 736	if (!ufile->ucontext)
 737		goto out_unlock;
 738
 739	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 740	if (!priv)
 741		goto out_unlock;
 742	rdma_umap_priv_init(priv, vma, opriv->entry);
 743
 744	mutex_unlock(&ufile->disassociation_lock);
 745	up_read(&ufile->hw_destroy_rwsem);
 746	return;
 747
 748out_unlock:
 749	mutex_unlock(&ufile->disassociation_lock);
 750	up_read(&ufile->hw_destroy_rwsem);
 751out_zap:
 752	/*
 753	 * We can't allow the VMA to be created with the actual IO pages, that
 754	 * would break our API contract, and it can't be stopped at this
 755	 * point, so zap it.
 756	 */
 757	vma->vm_private_data = NULL;
 758	zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
 759}
 760
 761static void rdma_umap_close(struct vm_area_struct *vma)
 762{
 763	struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 764	struct rdma_umap_priv *priv = vma->vm_private_data;
 765
 766	if (!priv)
 767		return;
 768
 769	/*
 770	 * The vma holds a reference on the struct file that created it, which
 771	 * in turn means that the ib_uverbs_file is guaranteed to exist at
 772	 * this point.
 773	 */
 774	mutex_lock(&ufile->umap_lock);
 775	if (priv->entry)
 776		rdma_user_mmap_entry_put(priv->entry);
 777
 778	list_del(&priv->list);
 779	mutex_unlock(&ufile->umap_lock);
 780	kfree(priv);
 781}
 782
 783/*
 784 * Once the zap_vma_ptes has been called touches to the VMA will come here and
 785 * we return a dummy writable zero page for all the pfns.
 786 */
 787static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
 788{
 789	struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
 790	struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
 791	vm_fault_t ret = 0;
 792
 793	if (!priv)
 794		return VM_FAULT_SIGBUS;
 795
 796	/* Read only pages can just use the system zero page. */
 797	if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
 798		vmf->page = ZERO_PAGE(vmf->address);
 799		get_page(vmf->page);
 800		return 0;
 801	}
 802
 803	mutex_lock(&ufile->umap_lock);
 804	if (!ufile->disassociate_page)
 805		ufile->disassociate_page =
 806			alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
 807
 808	if (ufile->disassociate_page) {
 809		/*
 810		 * This VMA is forced to always be shared so this doesn't have
 811		 * to worry about COW.
 812		 */
 813		vmf->page = ufile->disassociate_page;
 814		get_page(vmf->page);
 815	} else {
 816		ret = VM_FAULT_SIGBUS;
 817	}
 818	mutex_unlock(&ufile->umap_lock);
 819
 820	return ret;
 821}
 822
 823static const struct vm_operations_struct rdma_umap_ops = {
 824	.open = rdma_umap_open,
 825	.close = rdma_umap_close,
 826	.fault = rdma_umap_fault,
 827};
 828
 829void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
 830{
 831	struct rdma_umap_priv *priv, *next_priv;
 832
 833	mutex_lock(&ufile->disassociation_lock);
 834
 835	while (1) {
 836		struct mm_struct *mm = NULL;
 837
 838		/* Get an arbitrary mm pointer that hasn't been cleaned yet */
 839		mutex_lock(&ufile->umap_lock);
 840		while (!list_empty(&ufile->umaps)) {
 841			int ret;
 842
 843			priv = list_first_entry(&ufile->umaps,
 844						struct rdma_umap_priv, list);
 845			mm = priv->vma->vm_mm;
 846			ret = mmget_not_zero(mm);
 847			if (!ret) {
 848				list_del_init(&priv->list);
 849				if (priv->entry) {
 850					rdma_user_mmap_entry_put(priv->entry);
 851					priv->entry = NULL;
 852				}
 853				mm = NULL;
 854				continue;
 855			}
 856			break;
 857		}
 858		mutex_unlock(&ufile->umap_lock);
 859		if (!mm) {
 860			mutex_unlock(&ufile->disassociation_lock);
 861			return;
 862		}
 863
 864		/*
 865		 * The umap_lock is nested under mmap_lock since it used within
 866		 * the vma_ops callbacks, so we have to clean the list one mm
 867		 * at a time to get the lock ordering right. Typically there
 868		 * will only be one mm, so no big deal.
 869		 */
 870		mmap_read_lock(mm);
 
 
 871		mutex_lock(&ufile->umap_lock);
 872		list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
 873					  list) {
 874			struct vm_area_struct *vma = priv->vma;
 875
 876			if (vma->vm_mm != mm)
 877				continue;
 878			list_del_init(&priv->list);
 879
 880			zap_vma_ptes(vma, vma->vm_start,
 881				     vma->vm_end - vma->vm_start);
 882
 883			if (priv->entry) {
 884				rdma_user_mmap_entry_put(priv->entry);
 885				priv->entry = NULL;
 886			}
 887		}
 888		mutex_unlock(&ufile->umap_lock);
 
 889		mmap_read_unlock(mm);
 890		mmput(mm);
 891	}
 892
 893	mutex_unlock(&ufile->disassociation_lock);
 894}
 895
 896/**
 897 * rdma_user_mmap_disassociate() - Revoke mmaps for a device
 898 * @device: device to revoke
 899 *
 900 * This function should be called by drivers that need to disable mmaps for the
 901 * device, for instance because it is going to be reset.
 902 */
 903void rdma_user_mmap_disassociate(struct ib_device *device)
 904{
 905	struct ib_uverbs_device *uverbs_dev =
 906		ib_get_client_data(device, &uverbs_client);
 907	struct ib_uverbs_file *ufile;
 908
 909	mutex_lock(&uverbs_dev->lists_mutex);
 910	list_for_each_entry(ufile, &uverbs_dev->uverbs_file_list, list) {
 911		if (ufile->ucontext)
 912			uverbs_user_mmap_disassociate(ufile);
 913	}
 914	mutex_unlock(&uverbs_dev->lists_mutex);
 915}
 916EXPORT_SYMBOL(rdma_user_mmap_disassociate);
 917
 918/*
 919 * ib_uverbs_open() does not need the BKL:
 920 *
 921 *  - the ib_uverbs_device structures are properly reference counted and
 922 *    everything else is purely local to the file being created, so
 923 *    races against other open calls are not a problem;
 924 *  - there is no ioctl method to race against;
 925 *  - the open method will either immediately run -ENXIO, or all
 926 *    required initialization will be done.
 927 */
 928static int ib_uverbs_open(struct inode *inode, struct file *filp)
 929{
 930	struct ib_uverbs_device *dev;
 931	struct ib_uverbs_file *file;
 932	struct ib_device *ib_dev;
 933	int ret;
 934	int module_dependent;
 935	int srcu_key;
 936
 937	dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 938	if (!refcount_inc_not_zero(&dev->refcount))
 939		return -ENXIO;
 940
 941	get_device(&dev->dev);
 942	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 943	mutex_lock(&dev->lists_mutex);
 944	ib_dev = srcu_dereference(dev->ib_dev,
 945				  &dev->disassociate_srcu);
 946	if (!ib_dev) {
 947		ret = -EIO;
 948		goto err;
 949	}
 950
 951	if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
 952		ret = -EPERM;
 953		goto err;
 954	}
 955
 956	/* In case IB device supports disassociate ucontext, there is no hard
 957	 * dependency between uverbs device and its low level device.
 958	 */
 959	module_dependent = !(ib_dev->ops.disassociate_ucontext);
 960
 961	if (module_dependent) {
 962		if (!try_module_get(ib_dev->ops.owner)) {
 963			ret = -ENODEV;
 964			goto err;
 965		}
 966	}
 967
 968	file = kzalloc(sizeof(*file), GFP_KERNEL);
 969	if (!file) {
 970		ret = -ENOMEM;
 971		if (module_dependent)
 972			goto err_module;
 973
 974		goto err;
 975	}
 976
 977	file->device	 = dev;
 978	kref_init(&file->ref);
 979	mutex_init(&file->ucontext_lock);
 980
 981	spin_lock_init(&file->uobjects_lock);
 982	INIT_LIST_HEAD(&file->uobjects);
 983	init_rwsem(&file->hw_destroy_rwsem);
 984	mutex_init(&file->umap_lock);
 985	INIT_LIST_HEAD(&file->umaps);
 986
 987	mutex_init(&file->disassociation_lock);
 988
 989	filp->private_data = file;
 990	list_add_tail(&file->list, &dev->uverbs_file_list);
 991	mutex_unlock(&dev->lists_mutex);
 992	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 993
 994	setup_ufile_idr_uobject(file);
 995
 996	return stream_open(inode, filp);
 997
 998err_module:
 999	module_put(ib_dev->ops.owner);
1000
1001err:
1002	mutex_unlock(&dev->lists_mutex);
1003	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1004	if (refcount_dec_and_test(&dev->refcount))
1005		ib_uverbs_comp_dev(dev);
1006
1007	put_device(&dev->dev);
1008	return ret;
1009}
1010
1011static int ib_uverbs_close(struct inode *inode, struct file *filp)
1012{
1013	struct ib_uverbs_file *file = filp->private_data;
1014
1015	uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
1016
1017	mutex_lock(&file->device->lists_mutex);
1018	list_del_init(&file->list);
1019	mutex_unlock(&file->device->lists_mutex);
1020
1021	kref_put(&file->ref, ib_uverbs_release_file);
1022
1023	return 0;
1024}
1025
1026static const struct file_operations uverbs_fops = {
1027	.owner	 = THIS_MODULE,
1028	.write	 = ib_uverbs_write,
1029	.open	 = ib_uverbs_open,
1030	.release = ib_uverbs_close,
 
1031	.unlocked_ioctl = ib_uverbs_ioctl,
1032	.compat_ioctl = compat_ptr_ioctl,
1033};
1034
1035static const struct file_operations uverbs_mmap_fops = {
1036	.owner	 = THIS_MODULE,
1037	.write	 = ib_uverbs_write,
1038	.mmap    = ib_uverbs_mmap,
1039	.open	 = ib_uverbs_open,
1040	.release = ib_uverbs_close,
 
1041	.unlocked_ioctl = ib_uverbs_ioctl,
1042	.compat_ioctl = compat_ptr_ioctl,
1043};
1044
1045static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1046				 struct ib_client_nl_info *res)
1047{
1048	struct ib_uverbs_device *uverbs_dev = client_data;
1049	int ret;
1050
1051	if (res->port != -1)
1052		return -EINVAL;
1053
1054	res->abi = ibdev->ops.uverbs_abi_ver;
1055	res->cdev = &uverbs_dev->dev;
1056
1057	/*
1058	 * To support DRIVER_ID binding in userspace some of the driver need
1059	 * upgrading to expose their PCI dependent revision information
1060	 * through get_context instead of relying on modalias matching. When
1061	 * the drivers are fixed they can drop this flag.
1062	 */
1063	if (!ibdev->ops.uverbs_no_driver_id_binding) {
1064		ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1065				  ibdev->ops.driver_id);
1066		if (ret)
1067			return ret;
1068	}
1069	return 0;
1070}
1071
1072static struct ib_client uverbs_client = {
1073	.name   = "uverbs",
1074	.no_kverbs_req = true,
1075	.add    = ib_uverbs_add_one,
1076	.remove = ib_uverbs_remove_one,
1077	.get_nl_info = ib_uverbs_get_nl_info,
1078};
1079MODULE_ALIAS_RDMA_CLIENT("uverbs");
1080
1081static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1082			  char *buf)
1083{
1084	struct ib_uverbs_device *dev =
1085			container_of(device, struct ib_uverbs_device, dev);
1086	int ret = -ENODEV;
1087	int srcu_key;
1088	struct ib_device *ib_dev;
1089
1090	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1091	ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1092	if (ib_dev)
1093		ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev));
1094	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1095
1096	return ret;
1097}
1098static DEVICE_ATTR_RO(ibdev);
1099
1100static ssize_t abi_version_show(struct device *device,
1101				struct device_attribute *attr, char *buf)
1102{
1103	struct ib_uverbs_device *dev =
1104			container_of(device, struct ib_uverbs_device, dev);
1105	int ret = -ENODEV;
1106	int srcu_key;
1107	struct ib_device *ib_dev;
1108
1109	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1110	ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1111	if (ib_dev)
1112		ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1113	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1114
1115	return ret;
1116}
1117static DEVICE_ATTR_RO(abi_version);
1118
1119static struct attribute *ib_dev_attrs[] = {
1120	&dev_attr_abi_version.attr,
1121	&dev_attr_ibdev.attr,
1122	NULL,
1123};
1124
1125static const struct attribute_group dev_attr_group = {
1126	.attrs = ib_dev_attrs,
1127};
1128
1129static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1130			 __stringify(IB_USER_VERBS_ABI_VERSION));
1131
1132static int ib_uverbs_create_uapi(struct ib_device *device,
1133				 struct ib_uverbs_device *uverbs_dev)
1134{
1135	struct uverbs_api *uapi;
1136
1137	uapi = uverbs_alloc_api(device);
1138	if (IS_ERR(uapi))
1139		return PTR_ERR(uapi);
1140
1141	uverbs_dev->uapi = uapi;
1142	return 0;
1143}
1144
1145static int ib_uverbs_add_one(struct ib_device *device)
1146{
1147	int devnum;
1148	dev_t base;
1149	struct ib_uverbs_device *uverbs_dev;
1150	int ret;
1151
1152	if (!device->ops.alloc_ucontext ||
1153	    device->type == RDMA_DEVICE_TYPE_SMI)
1154		return -EOPNOTSUPP;
1155
1156	uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1157	if (!uverbs_dev)
1158		return -ENOMEM;
1159
1160	ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1161	if (ret) {
1162		kfree(uverbs_dev);
1163		return -ENOMEM;
1164	}
1165
1166	device_initialize(&uverbs_dev->dev);
1167	uverbs_dev->dev.class = &uverbs_class;
1168	uverbs_dev->dev.parent = device->dev.parent;
1169	uverbs_dev->dev.release = ib_uverbs_release_dev;
1170	uverbs_dev->groups[0] = &dev_attr_group;
1171	uverbs_dev->dev.groups = uverbs_dev->groups;
1172	refcount_set(&uverbs_dev->refcount, 1);
1173	init_completion(&uverbs_dev->comp);
1174	uverbs_dev->xrcd_tree = RB_ROOT;
1175	mutex_init(&uverbs_dev->xrcd_tree_mutex);
1176	mutex_init(&uverbs_dev->lists_mutex);
1177	INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1178	rcu_assign_pointer(uverbs_dev->ib_dev, device);
1179	uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1180
1181	devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1182			       GFP_KERNEL);
1183	if (devnum < 0) {
1184		ret = -ENOMEM;
1185		goto err;
1186	}
1187	uverbs_dev->devnum = devnum;
1188	if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1189		base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1190	else
1191		base = IB_UVERBS_BASE_DEV + devnum;
1192
1193	ret = ib_uverbs_create_uapi(device, uverbs_dev);
1194	if (ret)
1195		goto err_uapi;
1196
1197	uverbs_dev->dev.devt = base;
1198	dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1199
1200	cdev_init(&uverbs_dev->cdev,
1201		  device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1202	uverbs_dev->cdev.owner = THIS_MODULE;
1203
1204	ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1205	if (ret)
1206		goto err_uapi;
1207
1208	ib_set_client_data(device, &uverbs_client, uverbs_dev);
1209	return 0;
1210
1211err_uapi:
1212	ida_free(&uverbs_ida, devnum);
1213err:
1214	if (refcount_dec_and_test(&uverbs_dev->refcount))
1215		ib_uverbs_comp_dev(uverbs_dev);
1216	wait_for_completion(&uverbs_dev->comp);
1217	put_device(&uverbs_dev->dev);
1218	return ret;
1219}
1220
1221static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1222					struct ib_device *ib_dev)
1223{
1224	struct ib_uverbs_file *file;
1225
1226	/* Pending running commands to terminate */
1227	uverbs_disassociate_api_pre(uverbs_dev);
1228
1229	mutex_lock(&uverbs_dev->lists_mutex);
1230	while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1231		file = list_first_entry(&uverbs_dev->uverbs_file_list,
1232					struct ib_uverbs_file, list);
1233		list_del_init(&file->list);
1234		kref_get(&file->ref);
1235
1236		/* We must release the mutex before going ahead and calling
1237		 * uverbs_cleanup_ufile, as it might end up indirectly calling
1238		 * uverbs_close, for example due to freeing the resources (e.g
1239		 * mmput).
1240		 */
1241		mutex_unlock(&uverbs_dev->lists_mutex);
1242
1243		uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1244		kref_put(&file->ref, ib_uverbs_release_file);
1245
1246		mutex_lock(&uverbs_dev->lists_mutex);
1247	}
1248	mutex_unlock(&uverbs_dev->lists_mutex);
1249
1250	uverbs_disassociate_api(uverbs_dev->uapi);
1251}
1252
1253static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1254{
1255	struct ib_uverbs_device *uverbs_dev = client_data;
1256	int wait_clients = 1;
1257
1258	cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1259	ida_free(&uverbs_ida, uverbs_dev->devnum);
1260
1261	if (device->ops.disassociate_ucontext) {
1262		/* We disassociate HW resources and immediately return.
1263		 * Userspace will see a EIO errno for all future access.
1264		 * Upon returning, ib_device may be freed internally and is not
1265		 * valid any more.
1266		 * uverbs_device is still available until all clients close
1267		 * their files, then the uverbs device ref count will be zero
1268		 * and its resources will be freed.
1269		 * Note: At this point no more files can be opened since the
1270		 * cdev was deleted, however active clients can still issue
1271		 * commands and close their open files.
1272		 */
1273		ib_uverbs_free_hw_resources(uverbs_dev, device);
1274		wait_clients = 0;
1275	}
1276
1277	if (refcount_dec_and_test(&uverbs_dev->refcount))
1278		ib_uverbs_comp_dev(uverbs_dev);
1279	if (wait_clients)
1280		wait_for_completion(&uverbs_dev->comp);
1281
1282	put_device(&uverbs_dev->dev);
1283}
1284
 
 
 
 
 
 
 
1285static int __init ib_uverbs_init(void)
1286{
1287	int ret;
1288
1289	ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1290				     IB_UVERBS_NUM_FIXED_MINOR,
1291				     "infiniband_verbs");
1292	if (ret) {
1293		pr_err("user_verbs: couldn't register device number\n");
1294		goto out;
1295	}
1296
1297	ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1298				  IB_UVERBS_NUM_DYNAMIC_MINOR,
1299				  "infiniband_verbs");
1300	if (ret) {
1301		pr_err("couldn't register dynamic device number\n");
1302		goto out_alloc;
1303	}
1304
1305	ret = class_register(&uverbs_class);
1306	if (ret) {
 
1307		pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1308		goto out_chrdev;
1309	}
1310
1311	ret = class_create_file(&uverbs_class, &class_attr_abi_version.attr);
 
 
1312	if (ret) {
1313		pr_err("user_verbs: couldn't create abi_version attribute\n");
1314		goto out_class;
1315	}
1316
1317	ret = ib_register_client(&uverbs_client);
1318	if (ret) {
1319		pr_err("user_verbs: couldn't register client\n");
1320		goto out_class;
1321	}
1322
1323	return 0;
1324
1325out_class:
1326	class_unregister(&uverbs_class);
1327
1328out_chrdev:
1329	unregister_chrdev_region(dynamic_uverbs_dev,
1330				 IB_UVERBS_NUM_DYNAMIC_MINOR);
1331
1332out_alloc:
1333	unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1334				 IB_UVERBS_NUM_FIXED_MINOR);
1335
1336out:
1337	return ret;
1338}
1339
1340static void __exit ib_uverbs_cleanup(void)
1341{
1342	ib_unregister_client(&uverbs_client);
1343	class_unregister(&uverbs_class);
1344	unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1345				 IB_UVERBS_NUM_FIXED_MINOR);
1346	unregister_chrdev_region(dynamic_uverbs_dev,
1347				 IB_UVERBS_NUM_DYNAMIC_MINOR);
1348	mmu_notifier_synchronize();
1349}
1350
1351module_init(ib_uverbs_init);
1352module_exit(ib_uverbs_cleanup);