1 /* 2 * Copyright (c) 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 6 * Copyright (c) 2005 PathScale, Inc. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 */ 36 37 #include <linux/module.h> 38 #include <linux/init.h> 39 #include <linux/device.h> 40 #include <linux/err.h> 41 #include <linux/fs.h> 42 #include <linux/poll.h> 43 #include <linux/sched.h> 44 #include <linux/file.h> 45 #include <linux/cdev.h> 46 #include <linux/anon_inodes.h> 47 #include <linux/slab.h> 48 49 #include <linux/uaccess.h> 50 51 #include <rdma/ib.h> 52 #include <rdma/uverbs_std_types.h> 53 54 #include "uverbs.h" 55 #include "core_priv.h" 56 #include "rdma_core.h" 57 58 MODULE_AUTHOR("Roland Dreier"); 59 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 60 MODULE_LICENSE("Dual BSD/GPL"); 61 62 enum { 63 IB_UVERBS_MAJOR = 231, 64 IB_UVERBS_BASE_MINOR = 192, 65 IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS, 66 IB_UVERBS_NUM_FIXED_MINOR = 32, 67 IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR, 68 }; 69 70 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 71 72 static dev_t dynamic_uverbs_dev; 73 static struct class *uverbs_class; 74 75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 76 77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 78 const char __user *buf, int in_len, 79 int out_len) = { 80 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 81 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 82 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 83 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 84 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 85 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 86 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 87 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 88 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 89 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 90 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 91 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 92 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 93 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 94 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 95 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 96 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 97 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 98 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 99 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 100 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 101 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 102 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 103 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 104 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 105 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 106 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 107 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 108 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 109 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 110 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 111 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 112 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 113 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 114 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 115 }; 116 117 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 118 struct ib_udata *ucore, 119 struct ib_udata *uhw) = { 120 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 121 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 122 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 123 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 124 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 125 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, 126 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, 127 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, 128 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, 129 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, 130 [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp, 131 [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq, 132 }; 133 134 static void ib_uverbs_add_one(struct ib_device *device); 135 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 136 137 /* 138 * Must be called with the ufile->device->disassociate_srcu held, and the lock 139 * must be held until use of the ucontext is finished. 140 */ 141 struct ib_ucontext *ib_uverbs_get_ucontext(struct ib_uverbs_file *ufile) 142 { 143 /* 144 * We do not hold the hw_destroy_rwsem lock for this flow, instead 145 * srcu is used. It does not matter if someone races this with 146 * get_context, we get NULL or valid ucontext. 147 */ 148 struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext); 149 150 if (!srcu_dereference(ufile->device->ib_dev, 151 &ufile->device->disassociate_srcu)) 152 return ERR_PTR(-EIO); 153 154 if (!ucontext) 155 return ERR_PTR(-EINVAL); 156 157 return ucontext; 158 } 159 EXPORT_SYMBOL(ib_uverbs_get_ucontext); 160 161 int uverbs_dealloc_mw(struct ib_mw *mw) 162 { 163 struct ib_pd *pd = mw->pd; 164 int ret; 165 166 ret = mw->device->dealloc_mw(mw); 167 if (!ret) 168 atomic_dec(&pd->usecnt); 169 return ret; 170 } 171 172 static void ib_uverbs_release_dev(struct kobject *kobj) 173 { 174 struct ib_uverbs_device *dev = 175 container_of(kobj, struct ib_uverbs_device, kobj); 176 177 uverbs_destroy_api(dev->uapi); 178 cleanup_srcu_struct(&dev->disassociate_srcu); 179 kfree(dev); 180 } 181 182 static struct kobj_type ib_uverbs_dev_ktype = { 183 .release = ib_uverbs_release_dev, 184 }; 185 186 static void ib_uverbs_release_async_event_file(struct kref *ref) 187 { 188 struct ib_uverbs_async_event_file *file = 189 container_of(ref, struct ib_uverbs_async_event_file, ref); 190 191 kfree(file); 192 } 193 194 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 195 struct ib_uverbs_completion_event_file *ev_file, 196 struct ib_ucq_object *uobj) 197 { 198 struct ib_uverbs_event *evt, *tmp; 199 200 if (ev_file) { 201 spin_lock_irq(&ev_file->ev_queue.lock); 202 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 203 list_del(&evt->list); 204 kfree(evt); 205 } 206 spin_unlock_irq(&ev_file->ev_queue.lock); 207 208 uverbs_uobject_put(&ev_file->uobj); 209 } 210 211 spin_lock_irq(&file->async_file->ev_queue.lock); 212 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 213 list_del(&evt->list); 214 kfree(evt); 215 } 216 spin_unlock_irq(&file->async_file->ev_queue.lock); 217 } 218 219 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 220 struct ib_uevent_object *uobj) 221 { 222 struct ib_uverbs_event *evt, *tmp; 223 224 spin_lock_irq(&file->async_file->ev_queue.lock); 225 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 226 list_del(&evt->list); 227 kfree(evt); 228 } 229 spin_unlock_irq(&file->async_file->ev_queue.lock); 230 } 231 232 void ib_uverbs_detach_umcast(struct ib_qp *qp, 233 struct ib_uqp_object *uobj) 234 { 235 struct ib_uverbs_mcast_entry *mcast, *tmp; 236 237 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 238 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 239 list_del(&mcast->list); 240 kfree(mcast); 241 } 242 } 243 244 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 245 { 246 complete(&dev->comp); 247 } 248 249 void ib_uverbs_release_file(struct kref *ref) 250 { 251 struct ib_uverbs_file *file = 252 container_of(ref, struct ib_uverbs_file, ref); 253 struct ib_device *ib_dev; 254 int srcu_key; 255 256 release_ufile_idr_uobject(file); 257 258 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 259 ib_dev = srcu_dereference(file->device->ib_dev, 260 &file->device->disassociate_srcu); 261 if (ib_dev && !ib_dev->disassociate_ucontext) 262 module_put(ib_dev->owner); 263 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 264 265 if (atomic_dec_and_test(&file->device->refcount)) 266 ib_uverbs_comp_dev(file->device); 267 268 kobject_put(&file->device->kobj); 269 kfree(file); 270 } 271 272 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, 273 struct ib_uverbs_file *uverbs_file, 274 struct file *filp, char __user *buf, 275 size_t count, loff_t *pos, 276 size_t eventsz) 277 { 278 struct ib_uverbs_event *event; 279 int ret = 0; 280 281 spin_lock_irq(&ev_queue->lock); 282 283 while (list_empty(&ev_queue->event_list)) { 284 spin_unlock_irq(&ev_queue->lock); 285 286 if (filp->f_flags & O_NONBLOCK) 287 return -EAGAIN; 288 289 if (wait_event_interruptible(ev_queue->poll_wait, 290 (!list_empty(&ev_queue->event_list) || 291 /* The barriers built into wait_event_interruptible() 292 * and wake_up() guarentee this will see the null set 293 * without using RCU 294 */ 295 !uverbs_file->device->ib_dev))) 296 return -ERESTARTSYS; 297 298 /* If device was disassociated and no event exists set an error */ 299 if (list_empty(&ev_queue->event_list) && 300 !uverbs_file->device->ib_dev) 301 return -EIO; 302 303 spin_lock_irq(&ev_queue->lock); 304 } 305 306 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); 307 308 if (eventsz > count) { 309 ret = -EINVAL; 310 event = NULL; 311 } else { 312 list_del(ev_queue->event_list.next); 313 if (event->counter) { 314 ++(*event->counter); 315 list_del(&event->obj_list); 316 } 317 } 318 319 spin_unlock_irq(&ev_queue->lock); 320 321 if (event) { 322 if (copy_to_user(buf, event, eventsz)) 323 ret = -EFAULT; 324 else 325 ret = eventsz; 326 } 327 328 kfree(event); 329 330 return ret; 331 } 332 333 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, 334 size_t count, loff_t *pos) 335 { 336 struct ib_uverbs_async_event_file *file = filp->private_data; 337 338 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, 339 buf, count, pos, 340 sizeof(struct ib_uverbs_async_event_desc)); 341 } 342 343 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, 344 size_t count, loff_t *pos) 345 { 346 struct ib_uverbs_completion_event_file *comp_ev_file = 347 filp->private_data; 348 349 return ib_uverbs_event_read(&comp_ev_file->ev_queue, 350 comp_ev_file->uobj.ufile, filp, 351 buf, count, pos, 352 sizeof(struct ib_uverbs_comp_event_desc)); 353 } 354 355 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, 356 struct file *filp, 357 struct poll_table_struct *wait) 358 { 359 __poll_t pollflags = 0; 360 361 poll_wait(filp, &ev_queue->poll_wait, wait); 362 363 spin_lock_irq(&ev_queue->lock); 364 if (!list_empty(&ev_queue->event_list)) 365 pollflags = EPOLLIN | EPOLLRDNORM; 366 spin_unlock_irq(&ev_queue->lock); 367 368 return pollflags; 369 } 370 371 static __poll_t ib_uverbs_async_event_poll(struct file *filp, 372 struct poll_table_struct *wait) 373 { 374 return ib_uverbs_event_poll(filp->private_data, filp, wait); 375 } 376 377 static __poll_t ib_uverbs_comp_event_poll(struct file *filp, 378 struct poll_table_struct *wait) 379 { 380 struct ib_uverbs_completion_event_file *comp_ev_file = 381 filp->private_data; 382 383 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); 384 } 385 386 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) 387 { 388 struct ib_uverbs_event_queue *ev_queue = filp->private_data; 389 390 return fasync_helper(fd, filp, on, &ev_queue->async_queue); 391 } 392 393 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) 394 { 395 struct ib_uverbs_completion_event_file *comp_ev_file = 396 filp->private_data; 397 398 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); 399 } 400 401 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) 402 { 403 struct ib_uverbs_async_event_file *file = filp->private_data; 404 struct ib_uverbs_file *uverbs_file = file->uverbs_file; 405 struct ib_uverbs_event *entry, *tmp; 406 int closed_already = 0; 407 408 mutex_lock(&uverbs_file->device->lists_mutex); 409 spin_lock_irq(&file->ev_queue.lock); 410 closed_already = file->ev_queue.is_closed; 411 file->ev_queue.is_closed = 1; 412 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 413 if (entry->counter) 414 list_del(&entry->obj_list); 415 kfree(entry); 416 } 417 spin_unlock_irq(&file->ev_queue.lock); 418 if (!closed_already) { 419 list_del(&file->list); 420 ib_unregister_event_handler(&uverbs_file->event_handler); 421 } 422 mutex_unlock(&uverbs_file->device->lists_mutex); 423 424 kref_put(&uverbs_file->ref, ib_uverbs_release_file); 425 kref_put(&file->ref, ib_uverbs_release_async_event_file); 426 427 return 0; 428 } 429 430 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) 431 { 432 struct ib_uobject *uobj = filp->private_data; 433 struct ib_uverbs_completion_event_file *file = container_of( 434 uobj, struct ib_uverbs_completion_event_file, uobj); 435 struct ib_uverbs_event *entry, *tmp; 436 437 spin_lock_irq(&file->ev_queue.lock); 438 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 439 if (entry->counter) 440 list_del(&entry->obj_list); 441 kfree(entry); 442 } 443 spin_unlock_irq(&file->ev_queue.lock); 444 445 uverbs_close_fd(filp); 446 447 return 0; 448 } 449 450 const struct file_operations uverbs_event_fops = { 451 .owner = THIS_MODULE, 452 .read = ib_uverbs_comp_event_read, 453 .poll = ib_uverbs_comp_event_poll, 454 .release = ib_uverbs_comp_event_close, 455 .fasync = ib_uverbs_comp_event_fasync, 456 .llseek = no_llseek, 457 }; 458 459 static const struct file_operations uverbs_async_event_fops = { 460 .owner = THIS_MODULE, 461 .read = ib_uverbs_async_event_read, 462 .poll = ib_uverbs_async_event_poll, 463 .release = ib_uverbs_async_event_close, 464 .fasync = ib_uverbs_async_event_fasync, 465 .llseek = no_llseek, 466 }; 467 468 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 469 { 470 struct ib_uverbs_event_queue *ev_queue = cq_context; 471 struct ib_ucq_object *uobj; 472 struct ib_uverbs_event *entry; 473 unsigned long flags; 474 475 if (!ev_queue) 476 return; 477 478 spin_lock_irqsave(&ev_queue->lock, flags); 479 if (ev_queue->is_closed) { 480 spin_unlock_irqrestore(&ev_queue->lock, flags); 481 return; 482 } 483 484 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 485 if (!entry) { 486 spin_unlock_irqrestore(&ev_queue->lock, flags); 487 return; 488 } 489 490 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 491 492 entry->desc.comp.cq_handle = cq->uobject->user_handle; 493 entry->counter = &uobj->comp_events_reported; 494 495 list_add_tail(&entry->list, &ev_queue->event_list); 496 list_add_tail(&entry->obj_list, &uobj->comp_list); 497 spin_unlock_irqrestore(&ev_queue->lock, flags); 498 499 wake_up_interruptible(&ev_queue->poll_wait); 500 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); 501 } 502 503 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 504 __u64 element, __u64 event, 505 struct list_head *obj_list, 506 u32 *counter) 507 { 508 struct ib_uverbs_event *entry; 509 unsigned long flags; 510 511 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags); 512 if (file->async_file->ev_queue.is_closed) { 513 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 514 return; 515 } 516 517 entry = kmalloc(sizeof(*entry), GFP_ATOMIC); 518 if (!entry) { 519 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 520 return; 521 } 522 523 entry->desc.async.element = element; 524 entry->desc.async.event_type = event; 525 entry->desc.async.reserved = 0; 526 entry->counter = counter; 527 528 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list); 529 if (obj_list) 530 list_add_tail(&entry->obj_list, obj_list); 531 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 532 533 wake_up_interruptible(&file->async_file->ev_queue.poll_wait); 534 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN); 535 } 536 537 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 538 { 539 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 540 struct ib_ucq_object, uobject); 541 542 ib_uverbs_async_handler(uobj->uobject.ufile, uobj->uobject.user_handle, 543 event->event, &uobj->async_list, 544 &uobj->async_events_reported); 545 } 546 547 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 548 { 549 struct ib_uevent_object *uobj; 550 551 /* for XRC target qp's, check that qp is live */ 552 if (!event->element.qp->uobject) 553 return; 554 555 uobj = container_of(event->element.qp->uobject, 556 struct ib_uevent_object, uobject); 557 558 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 559 event->event, &uobj->event_list, 560 &uobj->events_reported); 561 } 562 563 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 564 { 565 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 566 struct ib_uevent_object, uobject); 567 568 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 569 event->event, &uobj->event_list, 570 &uobj->events_reported); 571 } 572 573 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 574 { 575 struct ib_uevent_object *uobj; 576 577 uobj = container_of(event->element.srq->uobject, 578 struct ib_uevent_object, uobject); 579 580 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 581 event->event, &uobj->event_list, 582 &uobj->events_reported); 583 } 584 585 void ib_uverbs_event_handler(struct ib_event_handler *handler, 586 struct ib_event *event) 587 { 588 struct ib_uverbs_file *file = 589 container_of(handler, struct ib_uverbs_file, event_handler); 590 591 ib_uverbs_async_handler(file, event->element.port_num, event->event, 592 NULL, NULL); 593 } 594 595 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 596 { 597 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file); 598 file->async_file = NULL; 599 } 600 601 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) 602 { 603 spin_lock_init(&ev_queue->lock); 604 INIT_LIST_HEAD(&ev_queue->event_list); 605 init_waitqueue_head(&ev_queue->poll_wait); 606 ev_queue->is_closed = 0; 607 ev_queue->async_queue = NULL; 608 } 609 610 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, 611 struct ib_device *ib_dev) 612 { 613 struct ib_uverbs_async_event_file *ev_file; 614 struct file *filp; 615 616 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 617 if (!ev_file) 618 return ERR_PTR(-ENOMEM); 619 620 ib_uverbs_init_event_queue(&ev_file->ev_queue); 621 ev_file->uverbs_file = uverbs_file; 622 kref_get(&ev_file->uverbs_file->ref); 623 kref_init(&ev_file->ref); 624 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops, 625 ev_file, O_RDONLY); 626 if (IS_ERR(filp)) 627 goto err_put_refs; 628 629 mutex_lock(&uverbs_file->device->lists_mutex); 630 list_add_tail(&ev_file->list, 631 &uverbs_file->device->uverbs_events_file_list); 632 mutex_unlock(&uverbs_file->device->lists_mutex); 633 634 WARN_ON(uverbs_file->async_file); 635 uverbs_file->async_file = ev_file; 636 kref_get(&uverbs_file->async_file->ref); 637 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 638 ib_dev, 639 ib_uverbs_event_handler); 640 ib_register_event_handler(&uverbs_file->event_handler); 641 /* At that point async file stuff was fully set */ 642 643 return filp; 644 645 err_put_refs: 646 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 647 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file); 648 return filp; 649 } 650 651 static bool verify_command_mask(struct ib_uverbs_file *ufile, u32 command, 652 bool extended) 653 { 654 if (!extended) 655 return ufile->uverbs_cmd_mask & BIT_ULL(command); 656 657 return ufile->uverbs_ex_cmd_mask & BIT_ULL(command); 658 } 659 660 static bool verify_command_idx(u32 command, bool extended) 661 { 662 if (extended) 663 return command < ARRAY_SIZE(uverbs_ex_cmd_table) && 664 uverbs_ex_cmd_table[command]; 665 666 return command < ARRAY_SIZE(uverbs_cmd_table) && 667 uverbs_cmd_table[command]; 668 } 669 670 static ssize_t process_hdr(struct ib_uverbs_cmd_hdr *hdr, 671 u32 *command, bool *extended) 672 { 673 if (hdr->command & ~(u32)(IB_USER_VERBS_CMD_FLAG_EXTENDED | 674 IB_USER_VERBS_CMD_COMMAND_MASK)) 675 return -EINVAL; 676 677 *command = hdr->command & IB_USER_VERBS_CMD_COMMAND_MASK; 678 *extended = hdr->command & IB_USER_VERBS_CMD_FLAG_EXTENDED; 679 680 if (!verify_command_idx(*command, *extended)) 681 return -EOPNOTSUPP; 682 683 return 0; 684 } 685 686 static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr, 687 struct ib_uverbs_ex_cmd_hdr *ex_hdr, 688 size_t count, bool extended) 689 { 690 if (extended) { 691 count -= sizeof(*hdr) + sizeof(*ex_hdr); 692 693 if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count) 694 return -EINVAL; 695 696 if (ex_hdr->cmd_hdr_reserved) 697 return -EINVAL; 698 699 if (ex_hdr->response) { 700 if (!hdr->out_words && !ex_hdr->provider_out_words) 701 return -EINVAL; 702 703 if (!access_ok(VERIFY_WRITE, 704 u64_to_user_ptr(ex_hdr->response), 705 (hdr->out_words + ex_hdr->provider_out_words) * 8)) 706 return -EFAULT; 707 } else { 708 if (hdr->out_words || ex_hdr->provider_out_words) 709 return -EINVAL; 710 } 711 712 return 0; 713 } 714 715 /* not extended command */ 716 if (hdr->in_words * 4 != count) 717 return -EINVAL; 718 719 return 0; 720 } 721 722 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 723 size_t count, loff_t *pos) 724 { 725 struct ib_uverbs_file *file = filp->private_data; 726 struct ib_uverbs_ex_cmd_hdr ex_hdr; 727 struct ib_uverbs_cmd_hdr hdr; 728 bool extended; 729 int srcu_key; 730 u32 command; 731 ssize_t ret; 732 733 if (!ib_safe_file_access(filp)) { 734 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", 735 task_tgid_vnr(current), current->comm); 736 return -EACCES; 737 } 738 739 if (count < sizeof(hdr)) 740 return -EINVAL; 741 742 if (copy_from_user(&hdr, buf, sizeof(hdr))) 743 return -EFAULT; 744 745 ret = process_hdr(&hdr, &command, &extended); 746 if (ret) 747 return ret; 748 749 if (extended) { 750 if (count < (sizeof(hdr) + sizeof(ex_hdr))) 751 return -EINVAL; 752 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) 753 return -EFAULT; 754 } 755 756 ret = verify_hdr(&hdr, &ex_hdr, count, extended); 757 if (ret) 758 return ret; 759 760 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 761 762 if (!verify_command_mask(file, command, extended)) { 763 ret = -EOPNOTSUPP; 764 goto out; 765 } 766 767 buf += sizeof(hdr); 768 769 if (!extended) { 770 ret = uverbs_cmd_table[command](file, buf, 771 hdr.in_words * 4, 772 hdr.out_words * 4); 773 } else { 774 struct ib_udata ucore; 775 struct ib_udata uhw; 776 777 buf += sizeof(ex_hdr); 778 779 ib_uverbs_init_udata_buf_or_null(&ucore, buf, 780 u64_to_user_ptr(ex_hdr.response), 781 hdr.in_words * 8, hdr.out_words * 8); 782 783 ib_uverbs_init_udata_buf_or_null(&uhw, 784 buf + ucore.inlen, 785 u64_to_user_ptr(ex_hdr.response) + ucore.outlen, 786 ex_hdr.provider_in_words * 8, 787 ex_hdr.provider_out_words * 8); 788 789 ret = uverbs_ex_cmd_table[command](file, &ucore, &uhw); 790 ret = (ret) ? : count; 791 } 792 793 out: 794 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 795 return ret; 796 } 797 798 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 799 { 800 struct ib_uverbs_file *file = filp->private_data; 801 struct ib_ucontext *ucontext; 802 int ret = 0; 803 int srcu_key; 804 805 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 806 ucontext = ib_uverbs_get_ucontext(file); 807 if (IS_ERR(ucontext)) { 808 ret = PTR_ERR(ucontext); 809 goto out; 810 } 811 812 ret = ucontext->device->mmap(ucontext, vma); 813 out: 814 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 815 return ret; 816 } 817 818 /* 819 * ib_uverbs_open() does not need the BKL: 820 * 821 * - the ib_uverbs_device structures are properly reference counted and 822 * everything else is purely local to the file being created, so 823 * races against other open calls are not a problem; 824 * - there is no ioctl method to race against; 825 * - the open method will either immediately run -ENXIO, or all 826 * required initialization will be done. 827 */ 828 static int ib_uverbs_open(struct inode *inode, struct file *filp) 829 { 830 struct ib_uverbs_device *dev; 831 struct ib_uverbs_file *file; 832 struct ib_device *ib_dev; 833 int ret; 834 int module_dependent; 835 int srcu_key; 836 837 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 838 if (!atomic_inc_not_zero(&dev->refcount)) 839 return -ENXIO; 840 841 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 842 mutex_lock(&dev->lists_mutex); 843 ib_dev = srcu_dereference(dev->ib_dev, 844 &dev->disassociate_srcu); 845 if (!ib_dev) { 846 ret = -EIO; 847 goto err; 848 } 849 850 /* In case IB device supports disassociate ucontext, there is no hard 851 * dependency between uverbs device and its low level device. 852 */ 853 module_dependent = !(ib_dev->disassociate_ucontext); 854 855 if (module_dependent) { 856 if (!try_module_get(ib_dev->owner)) { 857 ret = -ENODEV; 858 goto err; 859 } 860 } 861 862 file = kzalloc(sizeof(*file), GFP_KERNEL); 863 if (!file) { 864 ret = -ENOMEM; 865 if (module_dependent) 866 goto err_module; 867 868 goto err; 869 } 870 871 file->device = dev; 872 kref_init(&file->ref); 873 mutex_init(&file->ucontext_lock); 874 875 spin_lock_init(&file->uobjects_lock); 876 INIT_LIST_HEAD(&file->uobjects); 877 init_rwsem(&file->hw_destroy_rwsem); 878 879 filp->private_data = file; 880 kobject_get(&dev->kobj); 881 list_add_tail(&file->list, &dev->uverbs_file_list); 882 mutex_unlock(&dev->lists_mutex); 883 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 884 885 file->uverbs_cmd_mask = ib_dev->uverbs_cmd_mask; 886 file->uverbs_ex_cmd_mask = ib_dev->uverbs_ex_cmd_mask; 887 888 setup_ufile_idr_uobject(file); 889 890 return nonseekable_open(inode, filp); 891 892 err_module: 893 module_put(ib_dev->owner); 894 895 err: 896 mutex_unlock(&dev->lists_mutex); 897 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 898 if (atomic_dec_and_test(&dev->refcount)) 899 ib_uverbs_comp_dev(dev); 900 901 return ret; 902 } 903 904 static int ib_uverbs_close(struct inode *inode, struct file *filp) 905 { 906 struct ib_uverbs_file *file = filp->private_data; 907 908 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE); 909 910 mutex_lock(&file->device->lists_mutex); 911 if (!file->is_closed) { 912 list_del(&file->list); 913 file->is_closed = 1; 914 } 915 mutex_unlock(&file->device->lists_mutex); 916 917 if (file->async_file) 918 kref_put(&file->async_file->ref, 919 ib_uverbs_release_async_event_file); 920 921 kref_put(&file->ref, ib_uverbs_release_file); 922 923 return 0; 924 } 925 926 static const struct file_operations uverbs_fops = { 927 .owner = THIS_MODULE, 928 .write = ib_uverbs_write, 929 .open = ib_uverbs_open, 930 .release = ib_uverbs_close, 931 .llseek = no_llseek, 932 .unlocked_ioctl = ib_uverbs_ioctl, 933 .compat_ioctl = ib_uverbs_ioctl, 934 }; 935 936 static const struct file_operations uverbs_mmap_fops = { 937 .owner = THIS_MODULE, 938 .write = ib_uverbs_write, 939 .mmap = ib_uverbs_mmap, 940 .open = ib_uverbs_open, 941 .release = ib_uverbs_close, 942 .llseek = no_llseek, 943 .unlocked_ioctl = ib_uverbs_ioctl, 944 .compat_ioctl = ib_uverbs_ioctl, 945 }; 946 947 static struct ib_client uverbs_client = { 948 .name = "uverbs", 949 .add = ib_uverbs_add_one, 950 .remove = ib_uverbs_remove_one 951 }; 952 953 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 954 char *buf) 955 { 956 int ret = -ENODEV; 957 int srcu_key; 958 struct ib_uverbs_device *dev = dev_get_drvdata(device); 959 struct ib_device *ib_dev; 960 961 if (!dev) 962 return -ENODEV; 963 964 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 965 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 966 if (ib_dev) 967 ret = sprintf(buf, "%s\n", ib_dev->name); 968 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 969 970 return ret; 971 } 972 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 973 974 static ssize_t show_dev_abi_version(struct device *device, 975 struct device_attribute *attr, char *buf) 976 { 977 struct ib_uverbs_device *dev = dev_get_drvdata(device); 978 int ret = -ENODEV; 979 int srcu_key; 980 struct ib_device *ib_dev; 981 982 if (!dev) 983 return -ENODEV; 984 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 985 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 986 if (ib_dev) 987 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 988 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 989 990 return ret; 991 } 992 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 993 994 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 995 __stringify(IB_USER_VERBS_ABI_VERSION)); 996 997 static int ib_uverbs_create_uapi(struct ib_device *device, 998 struct ib_uverbs_device *uverbs_dev) 999 { 1000 struct uverbs_api *uapi; 1001 1002 uapi = uverbs_alloc_api(device->driver_specs, device->driver_id); 1003 if (IS_ERR(uapi)) 1004 return PTR_ERR(uapi); 1005 1006 uverbs_dev->uapi = uapi; 1007 return 0; 1008 } 1009 1010 static void ib_uverbs_add_one(struct ib_device *device) 1011 { 1012 int devnum; 1013 dev_t base; 1014 struct ib_uverbs_device *uverbs_dev; 1015 int ret; 1016 1017 if (!device->alloc_ucontext) 1018 return; 1019 1020 uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL); 1021 if (!uverbs_dev) 1022 return; 1023 1024 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1025 if (ret) { 1026 kfree(uverbs_dev); 1027 return; 1028 } 1029 1030 atomic_set(&uverbs_dev->refcount, 1); 1031 init_completion(&uverbs_dev->comp); 1032 uverbs_dev->xrcd_tree = RB_ROOT; 1033 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1034 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1035 mutex_init(&uverbs_dev->lists_mutex); 1036 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1037 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1038 1039 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1040 if (devnum >= IB_UVERBS_MAX_DEVICES) 1041 goto err; 1042 uverbs_dev->devnum = devnum; 1043 set_bit(devnum, dev_map); 1044 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR) 1045 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR; 1046 else 1047 base = IB_UVERBS_BASE_DEV + devnum; 1048 1049 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1050 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1051 1052 if (ib_uverbs_create_uapi(device, uverbs_dev)) 1053 goto err; 1054 1055 cdev_init(&uverbs_dev->cdev, NULL); 1056 uverbs_dev->cdev.owner = THIS_MODULE; 1057 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1058 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj); 1059 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1060 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1061 goto err_cdev; 1062 1063 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent, 1064 uverbs_dev->cdev.dev, uverbs_dev, 1065 "uverbs%d", uverbs_dev->devnum); 1066 if (IS_ERR(uverbs_dev->dev)) 1067 goto err_cdev; 1068 1069 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1070 goto err_class; 1071 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1072 goto err_class; 1073 1074 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1075 1076 return; 1077 1078 err_class: 1079 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1080 1081 err_cdev: 1082 cdev_del(&uverbs_dev->cdev); 1083 clear_bit(devnum, dev_map); 1084 1085 err: 1086 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1087 ib_uverbs_comp_dev(uverbs_dev); 1088 wait_for_completion(&uverbs_dev->comp); 1089 kobject_put(&uverbs_dev->kobj); 1090 return; 1091 } 1092 1093 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1094 struct ib_device *ib_dev) 1095 { 1096 struct ib_uverbs_file *file; 1097 struct ib_uverbs_async_event_file *event_file; 1098 struct ib_event event; 1099 1100 /* Pending running commands to terminate */ 1101 uverbs_disassociate_api_pre(uverbs_dev); 1102 event.event = IB_EVENT_DEVICE_FATAL; 1103 event.element.port_num = 0; 1104 event.device = ib_dev; 1105 1106 mutex_lock(&uverbs_dev->lists_mutex); 1107 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1108 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1109 struct ib_uverbs_file, list); 1110 file->is_closed = 1; 1111 list_del(&file->list); 1112 kref_get(&file->ref); 1113 1114 /* We must release the mutex before going ahead and calling 1115 * uverbs_cleanup_ufile, as it might end up indirectly calling 1116 * uverbs_close, for example due to freeing the resources (e.g 1117 * mmput). 1118 */ 1119 mutex_unlock(&uverbs_dev->lists_mutex); 1120 1121 ib_uverbs_event_handler(&file->event_handler, &event); 1122 uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE); 1123 kref_put(&file->ref, ib_uverbs_release_file); 1124 1125 mutex_lock(&uverbs_dev->lists_mutex); 1126 } 1127 1128 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1129 event_file = list_first_entry(&uverbs_dev-> 1130 uverbs_events_file_list, 1131 struct ib_uverbs_async_event_file, 1132 list); 1133 spin_lock_irq(&event_file->ev_queue.lock); 1134 event_file->ev_queue.is_closed = 1; 1135 spin_unlock_irq(&event_file->ev_queue.lock); 1136 1137 list_del(&event_file->list); 1138 ib_unregister_event_handler( 1139 &event_file->uverbs_file->event_handler); 1140 event_file->uverbs_file->event_handler.device = 1141 NULL; 1142 1143 wake_up_interruptible(&event_file->ev_queue.poll_wait); 1144 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN); 1145 } 1146 mutex_unlock(&uverbs_dev->lists_mutex); 1147 1148 uverbs_disassociate_api(uverbs_dev->uapi); 1149 } 1150 1151 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1152 { 1153 struct ib_uverbs_device *uverbs_dev = client_data; 1154 int wait_clients = 1; 1155 1156 if (!uverbs_dev) 1157 return; 1158 1159 dev_set_drvdata(uverbs_dev->dev, NULL); 1160 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1161 cdev_del(&uverbs_dev->cdev); 1162 clear_bit(uverbs_dev->devnum, dev_map); 1163 1164 if (device->disassociate_ucontext) { 1165 /* We disassociate HW resources and immediately return. 1166 * Userspace will see a EIO errno for all future access. 1167 * Upon returning, ib_device may be freed internally and is not 1168 * valid any more. 1169 * uverbs_device is still available until all clients close 1170 * their files, then the uverbs device ref count will be zero 1171 * and its resources will be freed. 1172 * Note: At this point no more files can be opened since the 1173 * cdev was deleted, however active clients can still issue 1174 * commands and close their open files. 1175 */ 1176 ib_uverbs_free_hw_resources(uverbs_dev, device); 1177 wait_clients = 0; 1178 } 1179 1180 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1181 ib_uverbs_comp_dev(uverbs_dev); 1182 if (wait_clients) 1183 wait_for_completion(&uverbs_dev->comp); 1184 1185 kobject_put(&uverbs_dev->kobj); 1186 } 1187 1188 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1189 { 1190 if (mode) 1191 *mode = 0666; 1192 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1193 } 1194 1195 static int __init ib_uverbs_init(void) 1196 { 1197 int ret; 1198 1199 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, 1200 IB_UVERBS_NUM_FIXED_MINOR, 1201 "infiniband_verbs"); 1202 if (ret) { 1203 pr_err("user_verbs: couldn't register device number\n"); 1204 goto out; 1205 } 1206 1207 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0, 1208 IB_UVERBS_NUM_DYNAMIC_MINOR, 1209 "infiniband_verbs"); 1210 if (ret) { 1211 pr_err("couldn't register dynamic device number\n"); 1212 goto out_alloc; 1213 } 1214 1215 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1216 if (IS_ERR(uverbs_class)) { 1217 ret = PTR_ERR(uverbs_class); 1218 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1219 goto out_chrdev; 1220 } 1221 1222 uverbs_class->devnode = uverbs_devnode; 1223 1224 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1225 if (ret) { 1226 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1227 goto out_class; 1228 } 1229 1230 ret = ib_register_client(&uverbs_client); 1231 if (ret) { 1232 pr_err("user_verbs: couldn't register client\n"); 1233 goto out_class; 1234 } 1235 1236 return 0; 1237 1238 out_class: 1239 class_destroy(uverbs_class); 1240 1241 out_chrdev: 1242 unregister_chrdev_region(dynamic_uverbs_dev, 1243 IB_UVERBS_NUM_DYNAMIC_MINOR); 1244 1245 out_alloc: 1246 unregister_chrdev_region(IB_UVERBS_BASE_DEV, 1247 IB_UVERBS_NUM_FIXED_MINOR); 1248 1249 out: 1250 return ret; 1251 } 1252 1253 static void __exit ib_uverbs_cleanup(void) 1254 { 1255 ib_unregister_client(&uverbs_client); 1256 class_destroy(uverbs_class); 1257 unregister_chrdev_region(IB_UVERBS_BASE_DEV, 1258 IB_UVERBS_NUM_FIXED_MINOR); 1259 unregister_chrdev_region(dynamic_uverbs_dev, 1260 IB_UVERBS_NUM_DYNAMIC_MINOR); 1261 } 1262 1263 module_init(ib_uverbs_init); 1264 module_exit(ib_uverbs_cleanup); 1265