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);
  79
  80static char *uverbs_devnode(const struct device *dev, umode_t *mode)
  81{
  82	if (mode)
  83		*mode = 0666;
  84	return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev));
  85}
  86
  87static const struct class uverbs_class = {
  88	.name = "infiniband_verbs",
  89	.devnode = uverbs_devnode,
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
  90};
  91
  92/*
  93 * Must be called with the ufile->device->disassociate_srcu held, and the lock
  94 * must be held until use of the ucontext is finished.
  95 */
  96struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile)
  97{
  98	/*
  99	 * We do not hold the hw_destroy_rwsem lock for this flow, instead
 100	 * srcu is used. It does not matter if someone races this with
 101	 * get_context, we get NULL or valid ucontext.
 102	 */
 103	struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext);
 104
 105	if (!srcu_dereference(ufile->device->ib_dev,
 106			      &ufile->device->disassociate_srcu))
 107		return ERR_PTR(-EIO);
 108
 109	if (!ucontext)
 110		return ERR_PTR(-EINVAL);
 111
 112	return ucontext;
 113}
 114EXPORT_SYMBOL(ib_uverbs_get_ucontext_file);
 115
 116int uverbs_dealloc_mw(struct ib_mw *mw)
 117{
 118	struct ib_pd *pd = mw->pd;
 119	int ret;
 120
 121	ret = mw->device->ops.dealloc_mw(mw);
 122	if (ret)
 123		return ret;
 124
 125	atomic_dec(&pd->usecnt);
 126	kfree(mw);
 127	return ret;
 128}
 129
 130static void ib_uverbs_release_dev(struct device *device)
 131{
 132	struct ib_uverbs_device *dev =
 133			container_of(device, struct ib_uverbs_device, dev);
 134
 135	uverbs_destroy_api(dev->uapi);
 136	cleanup_srcu_struct(&dev->disassociate_srcu);
 137	mutex_destroy(&dev->lists_mutex);
 138	mutex_destroy(&dev->xrcd_tree_mutex);
 139	kfree(dev);
 140}
 141
 142void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file,
 143			   struct ib_ucq_object *uobj)
 
 144{
 145	struct ib_uverbs_event *evt, *tmp;
 146
 147	if (ev_file) {
 148		spin_lock_irq(&ev_file->ev_queue.lock);
 149		list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) {
 150			list_del(&evt->list);
 151			kfree(evt);
 152		}
 153		spin_unlock_irq(&ev_file->ev_queue.lock);
 154
 155		uverbs_uobject_put(&ev_file->uobj);
 156	}
 157
 158	ib_uverbs_release_uevent(&uobj->uevent);
 
 
 
 
 
 159}
 160
 161void ib_uverbs_release_uevent(struct ib_uevent_object *uobj)
 
 162{
 163	struct ib_uverbs_async_event_file *async_file = uobj->event_file;
 164	struct ib_uverbs_event *evt, *tmp;
 165
 166	if (!async_file)
 167		return;
 168
 169	spin_lock_irq(&async_file->ev_queue.lock);
 170	list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) {
 171		list_del(&evt->list);
 172		kfree(evt);
 173	}
 174	spin_unlock_irq(&async_file->ev_queue.lock);
 175	uverbs_uobject_put(&async_file->uobj);
 176}
 177
 178void ib_uverbs_detach_umcast(struct ib_qp *qp,
 179			     struct ib_uqp_object *uobj)
 180{
 181	struct ib_uverbs_mcast_entry *mcast, *tmp;
 182
 183	list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) {
 184		ib_detach_mcast(qp, &mcast->gid, mcast->lid);
 185		list_del(&mcast->list);
 186		kfree(mcast);
 187	}
 188}
 189
 190static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev)
 
 191{
 192	complete(&dev->comp);
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 193}
 194
 195void ib_uverbs_release_file(struct kref *ref)
 196{
 197	struct ib_uverbs_file *file =
 198		container_of(ref, struct ib_uverbs_file, ref);
 199	struct ib_device *ib_dev;
 200	int srcu_key;
 201
 202	release_ufile_idr_uobject(file);
 
 203
 204	srcu_key = srcu_read_lock(&file->device->disassociate_srcu);
 205	ib_dev = srcu_dereference(file->device->ib_dev,
 206				  &file->device->disassociate_srcu);
 207	if (ib_dev && !ib_dev->ops.disassociate_ucontext)
 208		module_put(ib_dev->ops.owner);
 209	srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 210
 211	if (refcount_dec_and_test(&file->device->refcount))
 212		ib_uverbs_comp_dev(file->device);
 213
 214	if (file->default_async_file)
 215		uverbs_uobject_put(&file->default_async_file->uobj);
 216	put_device(&file->device->dev);
 217
 218	if (file->disassociate_page)
 219		__free_pages(file->disassociate_page, 0);
 220	mutex_destroy(&file->umap_lock);
 221	mutex_destroy(&file->ucontext_lock);
 222	kfree(file);
 223}
 224
 225static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue,
 226				    struct file *filp, char __user *buf,
 227				    size_t count, loff_t *pos,
 228				    size_t eventsz)
 229{
 
 230	struct ib_uverbs_event *event;
 
 231	int ret = 0;
 232
 233	spin_lock_irq(&ev_queue->lock);
 234
 235	while (list_empty(&ev_queue->event_list)) {
 236		if (ev_queue->is_closed) {
 237			spin_unlock_irq(&ev_queue->lock);
 238			return -EIO;
 239		}
 240
 241		spin_unlock_irq(&ev_queue->lock);
 242		if (filp->f_flags & O_NONBLOCK)
 243			return -EAGAIN;
 244
 245		if (wait_event_interruptible(ev_queue->poll_wait,
 246					     (!list_empty(&ev_queue->event_list) ||
 247					      ev_queue->is_closed)))
 248			return -ERESTARTSYS;
 249
 250		spin_lock_irq(&ev_queue->lock);
 251	}
 252
 253	event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list);
 
 
 
 
 
 254
 255	if (eventsz > count) {
 256		ret   = -EINVAL;
 257		event = NULL;
 258	} else {
 259		list_del(ev_queue->event_list.next);
 260		if (event->counter) {
 261			++(*event->counter);
 262			list_del(&event->obj_list);
 263		}
 264	}
 265
 266	spin_unlock_irq(&ev_queue->lock);
 267
 268	if (event) {
 269		if (copy_to_user(buf, event, eventsz))
 270			ret = -EFAULT;
 271		else
 272			ret = eventsz;
 273	}
 274
 275	kfree(event);
 276
 277	return ret;
 278}
 279
 280static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf,
 281					  size_t count, loff_t *pos)
 282{
 283	struct ib_uverbs_async_event_file *file = filp->private_data;
 284
 285	return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos,
 286				    sizeof(struct ib_uverbs_async_event_desc));
 287}
 288
 289static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf,
 290					 size_t count, loff_t *pos)
 291{
 292	struct ib_uverbs_completion_event_file *comp_ev_file =
 293		filp->private_data;
 294
 295	return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count,
 296				    pos,
 297				    sizeof(struct ib_uverbs_comp_event_desc));
 298}
 299
 300static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue,
 301					 struct file *filp,
 302					 struct poll_table_struct *wait)
 303{
 304	__poll_t pollflags = 0;
 
 305
 306	poll_wait(filp, &ev_queue->poll_wait, wait);
 307
 308	spin_lock_irq(&ev_queue->lock);
 309	if (!list_empty(&ev_queue->event_list))
 310		pollflags = EPOLLIN | EPOLLRDNORM;
 311	else if (ev_queue->is_closed)
 312		pollflags = EPOLLERR;
 313	spin_unlock_irq(&ev_queue->lock);
 314
 315	return pollflags;
 316}
 317
 318static __poll_t ib_uverbs_async_event_poll(struct file *filp,
 319					       struct poll_table_struct *wait)
 320{
 321	struct ib_uverbs_async_event_file *file = filp->private_data;
 322
 323	return ib_uverbs_event_poll(&file->ev_queue, filp, wait);
 324}
 325
 326static __poll_t ib_uverbs_comp_event_poll(struct file *filp,
 327					      struct poll_table_struct *wait)
 328{
 329	struct ib_uverbs_completion_event_file *comp_ev_file =
 330		filp->private_data;
 331
 332	return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait);
 333}
 334
 335static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on)
 336{
 337	struct ib_uverbs_async_event_file *file = filp->private_data;
 338
 339	return fasync_helper(fd, filp, on, &file->ev_queue.async_queue);
 340}
 341
 342static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on)
 343{
 344	struct ib_uverbs_completion_event_file *comp_ev_file =
 345		filp->private_data;
 
 346
 347	return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue);
 348}
 349
 350const struct file_operations uverbs_event_fops = {
 351	.owner	 = THIS_MODULE,
 352	.read	 = ib_uverbs_comp_event_read,
 353	.poll    = ib_uverbs_comp_event_poll,
 354	.release = uverbs_uobject_fd_release,
 355	.fasync  = ib_uverbs_comp_event_fasync,
 356	.llseek	 = no_llseek,
 357};
 358
 359const struct file_operations uverbs_async_event_fops = {
 360	.owner	 = THIS_MODULE,
 361	.read	 = ib_uverbs_async_event_read,
 362	.poll    = ib_uverbs_async_event_poll,
 363	.release = uverbs_async_event_release,
 364	.fasync  = ib_uverbs_async_event_fasync,
 365	.llseek	 = no_llseek,
 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	vma->vm_ops = &rdma_umap_ops;
 704	ret = ucontext->device->ops.mmap(ucontext, vma);
 705out:
 706	srcu_read_unlock(&file->device->disassociate_srcu, srcu_key);
 707	return ret;
 708}
 709
 710/*
 711 * The VMA has been dup'd, initialize the vm_private_data with a new tracking
 712 * struct
 713 */
 714static void rdma_umap_open(struct vm_area_struct *vma)
 715{
 716	struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 717	struct rdma_umap_priv *opriv = vma->vm_private_data;
 718	struct rdma_umap_priv *priv;
 719
 720	if (!opriv)
 721		return;
 722
 723	/* We are racing with disassociation */
 724	if (!down_read_trylock(&ufile->hw_destroy_rwsem))
 725		goto out_zap;
 726	/*
 727	 * Disassociation already completed, the VMA should already be zapped.
 728	 */
 729	if (!ufile->ucontext)
 730		goto out_unlock;
 731
 732	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 733	if (!priv)
 734		goto out_unlock;
 735	rdma_umap_priv_init(priv, vma, opriv->entry);
 736
 737	up_read(&ufile->hw_destroy_rwsem);
 738	return;
 739
 740out_unlock:
 741	up_read(&ufile->hw_destroy_rwsem);
 742out_zap:
 743	/*
 744	 * We can't allow the VMA to be created with the actual IO pages, that
 745	 * would break our API contract, and it can't be stopped at this
 746	 * point, so zap it.
 747	 */
 748	vma->vm_private_data = NULL;
 749	zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start);
 750}
 751
 752static void rdma_umap_close(struct vm_area_struct *vma)
 753{
 754	struct ib_uverbs_file *ufile = vma->vm_file->private_data;
 755	struct rdma_umap_priv *priv = vma->vm_private_data;
 756
 757	if (!priv)
 758		return;
 759
 760	/*
 761	 * The vma holds a reference on the struct file that created it, which
 762	 * in turn means that the ib_uverbs_file is guaranteed to exist at
 763	 * this point.
 764	 */
 765	mutex_lock(&ufile->umap_lock);
 766	if (priv->entry)
 767		rdma_user_mmap_entry_put(priv->entry);
 768
 769	list_del(&priv->list);
 770	mutex_unlock(&ufile->umap_lock);
 771	kfree(priv);
 772}
 773
 774/*
 775 * Once the zap_vma_ptes has been called touches to the VMA will come here and
 776 * we return a dummy writable zero page for all the pfns.
 777 */
 778static vm_fault_t rdma_umap_fault(struct vm_fault *vmf)
 779{
 780	struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data;
 781	struct rdma_umap_priv *priv = vmf->vma->vm_private_data;
 782	vm_fault_t ret = 0;
 783
 784	if (!priv)
 785		return VM_FAULT_SIGBUS;
 786
 787	/* Read only pages can just use the system zero page. */
 788	if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) {
 789		vmf->page = ZERO_PAGE(vmf->address);
 790		get_page(vmf->page);
 791		return 0;
 792	}
 793
 794	mutex_lock(&ufile->umap_lock);
 795	if (!ufile->disassociate_page)
 796		ufile->disassociate_page =
 797			alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0);
 798
 799	if (ufile->disassociate_page) {
 800		/*
 801		 * This VMA is forced to always be shared so this doesn't have
 802		 * to worry about COW.
 803		 */
 804		vmf->page = ufile->disassociate_page;
 805		get_page(vmf->page);
 806	} else {
 807		ret = VM_FAULT_SIGBUS;
 808	}
 809	mutex_unlock(&ufile->umap_lock);
 810
 811	return ret;
 812}
 813
 814static const struct vm_operations_struct rdma_umap_ops = {
 815	.open = rdma_umap_open,
 816	.close = rdma_umap_close,
 817	.fault = rdma_umap_fault,
 818};
 819
 820void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile)
 821{
 822	struct rdma_umap_priv *priv, *next_priv;
 823
 824	lockdep_assert_held(&ufile->hw_destroy_rwsem);
 825
 826	while (1) {
 827		struct mm_struct *mm = NULL;
 828
 829		/* Get an arbitrary mm pointer that hasn't been cleaned yet */
 830		mutex_lock(&ufile->umap_lock);
 831		while (!list_empty(&ufile->umaps)) {
 832			int ret;
 833
 834			priv = list_first_entry(&ufile->umaps,
 835						struct rdma_umap_priv, list);
 836			mm = priv->vma->vm_mm;
 837			ret = mmget_not_zero(mm);
 838			if (!ret) {
 839				list_del_init(&priv->list);
 840				if (priv->entry) {
 841					rdma_user_mmap_entry_put(priv->entry);
 842					priv->entry = NULL;
 843				}
 844				mm = NULL;
 845				continue;
 846			}
 847			break;
 848		}
 849		mutex_unlock(&ufile->umap_lock);
 850		if (!mm)
 851			return;
 852
 853		/*
 854		 * The umap_lock is nested under mmap_lock since it used within
 855		 * the vma_ops callbacks, so we have to clean the list one mm
 856		 * at a time to get the lock ordering right. Typically there
 857		 * will only be one mm, so no big deal.
 858		 */
 859		mmap_read_lock(mm);
 860		mutex_lock(&ufile->umap_lock);
 861		list_for_each_entry_safe (priv, next_priv, &ufile->umaps,
 862					  list) {
 863			struct vm_area_struct *vma = priv->vma;
 864
 865			if (vma->vm_mm != mm)
 866				continue;
 867			list_del_init(&priv->list);
 868
 869			zap_vma_ptes(vma, vma->vm_start,
 870				     vma->vm_end - vma->vm_start);
 871
 872			if (priv->entry) {
 873				rdma_user_mmap_entry_put(priv->entry);
 874				priv->entry = NULL;
 875			}
 876		}
 877		mutex_unlock(&ufile->umap_lock);
 878		mmap_read_unlock(mm);
 879		mmput(mm);
 880	}
 881}
 882
 883/*
 884 * ib_uverbs_open() does not need the BKL:
 885 *
 886 *  - the ib_uverbs_device structures are properly reference counted and
 887 *    everything else is purely local to the file being created, so
 888 *    races against other open calls are not a problem;
 889 *  - there is no ioctl method to race against;
 890 *  - the open method will either immediately run -ENXIO, or all
 891 *    required initialization will be done.
 892 */
 893static int ib_uverbs_open(struct inode *inode, struct file *filp)
 894{
 895	struct ib_uverbs_device *dev;
 896	struct ib_uverbs_file *file;
 897	struct ib_device *ib_dev;
 898	int ret;
 899	int module_dependent;
 900	int srcu_key;
 901
 902	dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev);
 903	if (!refcount_inc_not_zero(&dev->refcount))
 
 
 904		return -ENXIO;
 905
 906	get_device(&dev->dev);
 907	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
 908	mutex_lock(&dev->lists_mutex);
 909	ib_dev = srcu_dereference(dev->ib_dev,
 910				  &dev->disassociate_srcu);
 911	if (!ib_dev) {
 912		ret = -EIO;
 913		goto err;
 914	}
 915
 916	if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) {
 917		ret = -EPERM;
 918		goto err;
 919	}
 920
 921	/* In case IB device supports disassociate ucontext, there is no hard
 922	 * dependency between uverbs device and its low level device.
 923	 */
 924	module_dependent = !(ib_dev->ops.disassociate_ucontext);
 925
 926	if (module_dependent) {
 927		if (!try_module_get(ib_dev->ops.owner)) {
 928			ret = -ENODEV;
 929			goto err;
 930		}
 931	}
 932
 933	file = kzalloc(sizeof(*file), GFP_KERNEL);
 934	if (!file) {
 935		ret = -ENOMEM;
 936		if (module_dependent)
 937			goto err_module;
 938
 939		goto err;
 940	}
 941
 942	file->device	 = dev;
 
 
 943	kref_init(&file->ref);
 944	mutex_init(&file->ucontext_lock);
 945
 946	spin_lock_init(&file->uobjects_lock);
 947	INIT_LIST_HEAD(&file->uobjects);
 948	init_rwsem(&file->hw_destroy_rwsem);
 949	mutex_init(&file->umap_lock);
 950	INIT_LIST_HEAD(&file->umaps);
 951
 952	filp->private_data = file;
 953	list_add_tail(&file->list, &dev->uverbs_file_list);
 954	mutex_unlock(&dev->lists_mutex);
 955	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 956
 957	setup_ufile_idr_uobject(file);
 958
 959	return stream_open(inode, filp);
 960
 961err_module:
 962	module_put(ib_dev->ops.owner);
 963
 964err:
 965	mutex_unlock(&dev->lists_mutex);
 966	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
 967	if (refcount_dec_and_test(&dev->refcount))
 968		ib_uverbs_comp_dev(dev);
 969
 970	put_device(&dev->dev);
 971	return ret;
 972}
 973
 974static int ib_uverbs_close(struct inode *inode, struct file *filp)
 975{
 976	struct ib_uverbs_file *file = filp->private_data;
 977
 978	uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE);
 979
 980	mutex_lock(&file->device->lists_mutex);
 981	list_del_init(&file->list);
 982	mutex_unlock(&file->device->lists_mutex);
 983
 984	kref_put(&file->ref, ib_uverbs_release_file);
 985
 986	return 0;
 987}
 988
 989static const struct file_operations uverbs_fops = {
 990	.owner	 = THIS_MODULE,
 991	.write	 = ib_uverbs_write,
 992	.open	 = ib_uverbs_open,
 993	.release = ib_uverbs_close,
 994	.llseek	 = no_llseek,
 995	.unlocked_ioctl = ib_uverbs_ioctl,
 996	.compat_ioctl = compat_ptr_ioctl,
 997};
 998
 999static const struct file_operations uverbs_mmap_fops = {
1000	.owner	 = THIS_MODULE,
1001	.write	 = ib_uverbs_write,
1002	.mmap    = ib_uverbs_mmap,
1003	.open	 = ib_uverbs_open,
1004	.release = ib_uverbs_close,
1005	.llseek	 = no_llseek,
1006	.unlocked_ioctl = ib_uverbs_ioctl,
1007	.compat_ioctl = compat_ptr_ioctl,
1008};
1009
1010static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data,
1011				 struct ib_client_nl_info *res)
1012{
1013	struct ib_uverbs_device *uverbs_dev = client_data;
1014	int ret;
1015
1016	if (res->port != -1)
1017		return -EINVAL;
1018
1019	res->abi = ibdev->ops.uverbs_abi_ver;
1020	res->cdev = &uverbs_dev->dev;
1021
1022	/*
1023	 * To support DRIVER_ID binding in userspace some of the driver need
1024	 * upgrading to expose their PCI dependent revision information
1025	 * through get_context instead of relying on modalias matching. When
1026	 * the drivers are fixed they can drop this flag.
1027	 */
1028	if (!ibdev->ops.uverbs_no_driver_id_binding) {
1029		ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID,
1030				  ibdev->ops.driver_id);
1031		if (ret)
1032			return ret;
1033	}
1034	return 0;
1035}
1036
1037static struct ib_client uverbs_client = {
1038	.name   = "uverbs",
1039	.no_kverbs_req = true,
1040	.add    = ib_uverbs_add_one,
1041	.remove = ib_uverbs_remove_one,
1042	.get_nl_info = ib_uverbs_get_nl_info,
1043};
1044MODULE_ALIAS_RDMA_CLIENT("uverbs");
1045
1046static ssize_t ibdev_show(struct device *device, struct device_attribute *attr,
1047			  char *buf)
1048{
1049	struct ib_uverbs_device *dev =
1050			container_of(device, struct ib_uverbs_device, dev);
1051	int ret = -ENODEV;
1052	int srcu_key;
1053	struct ib_device *ib_dev;
1054
1055	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1056	ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1057	if (ib_dev)
1058		ret = sysfs_emit(buf, "%s\n", dev_name(&ib_dev->dev));
1059	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1060
1061	return ret;
 
 
 
1062}
1063static DEVICE_ATTR_RO(ibdev);
1064
1065static ssize_t abi_version_show(struct device *device,
1066				struct device_attribute *attr, char *buf)
1067{
1068	struct ib_uverbs_device *dev =
1069			container_of(device, struct ib_uverbs_device, dev);
1070	int ret = -ENODEV;
1071	int srcu_key;
1072	struct ib_device *ib_dev;
1073
1074	srcu_key = srcu_read_lock(&dev->disassociate_srcu);
1075	ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu);
1076	if (ib_dev)
1077		ret = sysfs_emit(buf, "%u\n", ib_dev->ops.uverbs_abi_ver);
1078	srcu_read_unlock(&dev->disassociate_srcu, srcu_key);
1079
1080	return ret;
1081}
1082static DEVICE_ATTR_RO(abi_version);
1083
1084static struct attribute *ib_dev_attrs[] = {
1085	&dev_attr_abi_version.attr,
1086	&dev_attr_ibdev.attr,
1087	NULL,
1088};
1089
1090static const struct attribute_group dev_attr_group = {
1091	.attrs = ib_dev_attrs,
1092};
1093
1094static CLASS_ATTR_STRING(abi_version, S_IRUGO,
1095			 __stringify(IB_USER_VERBS_ABI_VERSION));
1096
1097static int ib_uverbs_create_uapi(struct ib_device *device,
1098				 struct ib_uverbs_device *uverbs_dev)
 
 
 
 
 
 
 
1099{
1100	struct uverbs_api *uapi;
1101
1102	uapi = uverbs_alloc_api(device);
1103	if (IS_ERR(uapi))
1104		return PTR_ERR(uapi);
 
 
 
 
 
1105
1106	uverbs_dev->uapi = uapi;
1107	return 0;
 
 
 
1108}
1109
1110static int ib_uverbs_add_one(struct ib_device *device)
1111{
1112	int devnum;
1113	dev_t base;
1114	struct ib_uverbs_device *uverbs_dev;
1115	int ret;
1116
1117	if (!device->ops.alloc_ucontext)
1118		return -EOPNOTSUPP;
1119
1120	uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL);
1121	if (!uverbs_dev)
1122		return -ENOMEM;
1123
1124	ret = init_srcu_struct(&uverbs_dev->disassociate_srcu);
1125	if (ret) {
1126		kfree(uverbs_dev);
1127		return -ENOMEM;
1128	}
1129
1130	device_initialize(&uverbs_dev->dev);
1131	uverbs_dev->dev.class = &uverbs_class;
1132	uverbs_dev->dev.parent = device->dev.parent;
1133	uverbs_dev->dev.release = ib_uverbs_release_dev;
1134	uverbs_dev->groups[0] = &dev_attr_group;
1135	uverbs_dev->dev.groups = uverbs_dev->groups;
1136	refcount_set(&uverbs_dev->refcount, 1);
1137	init_completion(&uverbs_dev->comp);
1138	uverbs_dev->xrcd_tree = RB_ROOT;
1139	mutex_init(&uverbs_dev->xrcd_tree_mutex);
1140	mutex_init(&uverbs_dev->lists_mutex);
1141	INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list);
1142	rcu_assign_pointer(uverbs_dev->ib_dev, device);
1143	uverbs_dev->num_comp_vectors = device->num_comp_vectors;
1144
1145	devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1,
1146			       GFP_KERNEL);
1147	if (devnum < 0) {
1148		ret = -ENOMEM;
1149		goto err;
1150	}
1151	uverbs_dev->devnum = devnum;
1152	if (devnum >= IB_UVERBS_NUM_FIXED_MINOR)
1153		base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR;
1154	else
1155		base = IB_UVERBS_BASE_DEV + devnum;
1156
1157	ret = ib_uverbs_create_uapi(device, uverbs_dev);
1158	if (ret)
1159		goto err_uapi;
 
 
 
 
 
 
 
1160
1161	uverbs_dev->dev.devt = base;
1162	dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum);
1163
1164	cdev_init(&uverbs_dev->cdev,
1165		  device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops);
1166	uverbs_dev->cdev.owner = THIS_MODULE;
1167
1168	ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev);
1169	if (ret)
1170		goto err_uapi;
 
 
 
 
 
 
 
 
 
 
 
1171
1172	ib_set_client_data(device, &uverbs_client, uverbs_dev);
1173	return 0;
1174
1175err_uapi:
1176	ida_free(&uverbs_ida, devnum);
 
 
 
 
 
 
 
 
 
 
1177err:
1178	if (refcount_dec_and_test(&uverbs_dev->refcount))
1179		ib_uverbs_comp_dev(uverbs_dev);
1180	wait_for_completion(&uverbs_dev->comp);
1181	put_device(&uverbs_dev->dev);
1182	return ret;
1183}
1184
1185static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev,
1186					struct ib_device *ib_dev)
1187{
1188	struct ib_uverbs_file *file;
 
 
 
1189
1190	/* Pending running commands to terminate */
1191	uverbs_disassociate_api_pre(uverbs_dev);
 
 
 
 
 
 
1192
1193	mutex_lock(&uverbs_dev->lists_mutex);
1194	while (!list_empty(&uverbs_dev->uverbs_file_list)) {
1195		file = list_first_entry(&uverbs_dev->uverbs_file_list,
1196					struct ib_uverbs_file, list);
1197		list_del_init(&file->list);
1198		kref_get(&file->ref);
1199
1200		/* We must release the mutex before going ahead and calling
1201		 * uverbs_cleanup_ufile, as it might end up indirectly calling
1202		 * uverbs_close, for example due to freeing the resources (e.g
1203		 * mmput).
1204		 */
1205		mutex_unlock(&uverbs_dev->lists_mutex);
1206
1207		uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE);
1208		kref_put(&file->ref, ib_uverbs_release_file);
1209
1210		mutex_lock(&uverbs_dev->lists_mutex);
1211	}
1212	mutex_unlock(&uverbs_dev->lists_mutex);
1213
1214	uverbs_disassociate_api(uverbs_dev->uapi);
1215}
1216
1217static void ib_uverbs_remove_one(struct ib_device *device, void *client_data)
1218{
1219	struct ib_uverbs_device *uverbs_dev = client_data;
1220	int wait_clients = 1;
1221
1222	cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev);
1223	ida_free(&uverbs_ida, uverbs_dev->devnum);
1224
1225	if (device->ops.disassociate_ucontext) {
1226		/* We disassociate HW resources and immediately return.
1227		 * Userspace will see a EIO errno for all future access.
1228		 * Upon returning, ib_device may be freed internally and is not
1229		 * valid any more.
1230		 * uverbs_device is still available until all clients close
1231		 * their files, then the uverbs device ref count will be zero
1232		 * and its resources will be freed.
1233		 * Note: At this point no more files can be opened since the
1234		 * cdev was deleted, however active clients can still issue
1235		 * commands and close their open files.
1236		 */
1237		ib_uverbs_free_hw_resources(uverbs_dev, device);
1238		wait_clients = 0;
1239	}
1240
1241	if (refcount_dec_and_test(&uverbs_dev->refcount))
1242		ib_uverbs_comp_dev(uverbs_dev);
1243	if (wait_clients)
1244		wait_for_completion(&uverbs_dev->comp);
1245
1246	put_device(&uverbs_dev->dev);
 
 
 
 
1247}
1248
1249static int __init ib_uverbs_init(void)
1250{
1251	int ret;
1252
1253	ret = register_chrdev_region(IB_UVERBS_BASE_DEV,
1254				     IB_UVERBS_NUM_FIXED_MINOR,
1255				     "infiniband_verbs");
1256	if (ret) {
1257		pr_err("user_verbs: couldn't register device number\n");
1258		goto out;
1259	}
1260
1261	ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0,
1262				  IB_UVERBS_NUM_DYNAMIC_MINOR,
1263				  "infiniband_verbs");
1264	if (ret) {
1265		pr_err("couldn't register dynamic device number\n");
1266		goto out_alloc;
1267	}
1268
1269	ret = class_register(&uverbs_class);
1270	if (ret) {
1271		pr_err("user_verbs: couldn't create class infiniband_verbs\n");
1272		goto out_chrdev;
1273	}
1274
1275	ret = class_create_file(&uverbs_class, &class_attr_abi_version.attr);
 
 
1276	if (ret) {
1277		pr_err("user_verbs: couldn't create abi_version attribute\n");
1278		goto out_class;
1279	}
1280
1281	ret = ib_register_client(&uverbs_client);
1282	if (ret) {
1283		pr_err("user_verbs: couldn't register client\n");
1284		goto out_class;
1285	}
1286
1287	return 0;
1288
1289out_class:
1290	class_unregister(&uverbs_class);
1291
1292out_chrdev:
1293	unregister_chrdev_region(dynamic_uverbs_dev,
1294				 IB_UVERBS_NUM_DYNAMIC_MINOR);
1295
1296out_alloc:
1297	unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1298				 IB_UVERBS_NUM_FIXED_MINOR);
1299
1300out:
1301	return ret;
1302}
1303
1304static void __exit ib_uverbs_cleanup(void)
1305{
1306	ib_unregister_client(&uverbs_client);
1307	class_unregister(&uverbs_class);
1308	unregister_chrdev_region(IB_UVERBS_BASE_DEV,
1309				 IB_UVERBS_NUM_FIXED_MINOR);
1310	unregister_chrdev_region(dynamic_uverbs_dev,
1311				 IB_UVERBS_NUM_DYNAMIC_MINOR);
1312	mmu_notifier_synchronize();
 
 
 
 
 
1313}
1314
1315module_init(ib_uverbs_init);
1316module_exit(ib_uverbs_cleanup);