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 <asm/uaccess.h> 50 51 #include "uverbs.h" 52 53 MODULE_AUTHOR("Roland Dreier"); 54 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 55 MODULE_LICENSE("Dual BSD/GPL"); 56 57 enum { 58 IB_UVERBS_MAJOR = 231, 59 IB_UVERBS_BASE_MINOR = 192, 60 IB_UVERBS_MAX_DEVICES = 32 61 }; 62 63 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 64 65 static struct class *uverbs_class; 66 67 DEFINE_SPINLOCK(ib_uverbs_idr_lock); 68 DEFINE_IDR(ib_uverbs_pd_idr); 69 DEFINE_IDR(ib_uverbs_mr_idr); 70 DEFINE_IDR(ib_uverbs_mw_idr); 71 DEFINE_IDR(ib_uverbs_ah_idr); 72 DEFINE_IDR(ib_uverbs_cq_idr); 73 DEFINE_IDR(ib_uverbs_qp_idr); 74 DEFINE_IDR(ib_uverbs_srq_idr); 75 DEFINE_IDR(ib_uverbs_xrcd_idr); 76 DEFINE_IDR(ib_uverbs_rule_idr); 77 78 static DEFINE_SPINLOCK(map_lock); 79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 80 81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 82 struct ib_device *ib_dev, 83 const char __user *buf, int in_len, 84 int out_len) = { 85 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 86 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 87 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 88 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 89 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 90 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 91 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 92 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 93 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 94 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 95 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 96 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 97 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 98 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 99 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 100 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 101 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 102 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 103 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 104 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 105 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 106 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 107 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 108 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 109 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 110 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 111 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 112 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 113 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 114 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 115 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 116 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 117 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 118 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 119 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 120 }; 121 122 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 123 struct ib_device *ib_dev, 124 struct ib_udata *ucore, 125 struct ib_udata *uhw) = { 126 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 127 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 128 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 129 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 130 }; 131 132 static void ib_uverbs_add_one(struct ib_device *device); 133 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 134 135 static void ib_uverbs_release_dev(struct kobject *kobj) 136 { 137 struct ib_uverbs_device *dev = 138 container_of(kobj, struct ib_uverbs_device, kobj); 139 140 cleanup_srcu_struct(&dev->disassociate_srcu); 141 kfree(dev); 142 } 143 144 static struct kobj_type ib_uverbs_dev_ktype = { 145 .release = ib_uverbs_release_dev, 146 }; 147 148 static void ib_uverbs_release_event_file(struct kref *ref) 149 { 150 struct ib_uverbs_event_file *file = 151 container_of(ref, struct ib_uverbs_event_file, ref); 152 153 kfree(file); 154 } 155 156 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 157 struct ib_uverbs_event_file *ev_file, 158 struct ib_ucq_object *uobj) 159 { 160 struct ib_uverbs_event *evt, *tmp; 161 162 if (ev_file) { 163 spin_lock_irq(&ev_file->lock); 164 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 165 list_del(&evt->list); 166 kfree(evt); 167 } 168 spin_unlock_irq(&ev_file->lock); 169 170 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 171 } 172 173 spin_lock_irq(&file->async_file->lock); 174 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 175 list_del(&evt->list); 176 kfree(evt); 177 } 178 spin_unlock_irq(&file->async_file->lock); 179 } 180 181 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 182 struct ib_uevent_object *uobj) 183 { 184 struct ib_uverbs_event *evt, *tmp; 185 186 spin_lock_irq(&file->async_file->lock); 187 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 188 list_del(&evt->list); 189 kfree(evt); 190 } 191 spin_unlock_irq(&file->async_file->lock); 192 } 193 194 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 195 struct ib_uqp_object *uobj) 196 { 197 struct ib_uverbs_mcast_entry *mcast, *tmp; 198 199 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 200 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 201 list_del(&mcast->list); 202 kfree(mcast); 203 } 204 } 205 206 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 207 struct ib_ucontext *context) 208 { 209 struct ib_uobject *uobj, *tmp; 210 211 context->closing = 1; 212 213 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 214 struct ib_ah *ah = uobj->object; 215 216 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 217 ib_destroy_ah(ah); 218 kfree(uobj); 219 } 220 221 /* Remove MWs before QPs, in order to support type 2A MWs. */ 222 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { 223 struct ib_mw *mw = uobj->object; 224 225 idr_remove_uobj(&ib_uverbs_mw_idr, uobj); 226 ib_dealloc_mw(mw); 227 kfree(uobj); 228 } 229 230 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { 231 struct ib_flow *flow_id = uobj->object; 232 233 idr_remove_uobj(&ib_uverbs_rule_idr, uobj); 234 ib_destroy_flow(flow_id); 235 kfree(uobj); 236 } 237 238 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 239 struct ib_qp *qp = uobj->object; 240 struct ib_uqp_object *uqp = 241 container_of(uobj, struct ib_uqp_object, uevent.uobject); 242 243 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 244 if (qp != qp->real_qp) { 245 ib_close_qp(qp); 246 } else { 247 ib_uverbs_detach_umcast(qp, uqp); 248 ib_destroy_qp(qp); 249 } 250 ib_uverbs_release_uevent(file, &uqp->uevent); 251 kfree(uqp); 252 } 253 254 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 255 struct ib_srq *srq = uobj->object; 256 struct ib_uevent_object *uevent = 257 container_of(uobj, struct ib_uevent_object, uobject); 258 259 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 260 ib_destroy_srq(srq); 261 ib_uverbs_release_uevent(file, uevent); 262 kfree(uevent); 263 } 264 265 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 266 struct ib_cq *cq = uobj->object; 267 struct ib_uverbs_event_file *ev_file = cq->cq_context; 268 struct ib_ucq_object *ucq = 269 container_of(uobj, struct ib_ucq_object, uobject); 270 271 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 272 ib_destroy_cq(cq); 273 ib_uverbs_release_ucq(file, ev_file, ucq); 274 kfree(ucq); 275 } 276 277 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 278 struct ib_mr *mr = uobj->object; 279 280 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 281 ib_dereg_mr(mr); 282 kfree(uobj); 283 } 284 285 mutex_lock(&file->device->xrcd_tree_mutex); 286 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 287 struct ib_xrcd *xrcd = uobj->object; 288 struct ib_uxrcd_object *uxrcd = 289 container_of(uobj, struct ib_uxrcd_object, uobject); 290 291 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 292 ib_uverbs_dealloc_xrcd(file->device, xrcd); 293 kfree(uxrcd); 294 } 295 mutex_unlock(&file->device->xrcd_tree_mutex); 296 297 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 298 struct ib_pd *pd = uobj->object; 299 300 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 301 ib_dealloc_pd(pd); 302 kfree(uobj); 303 } 304 305 put_pid(context->tgid); 306 307 return context->device->dealloc_ucontext(context); 308 } 309 310 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 311 { 312 complete(&dev->comp); 313 } 314 315 static void ib_uverbs_release_file(struct kref *ref) 316 { 317 struct ib_uverbs_file *file = 318 container_of(ref, struct ib_uverbs_file, ref); 319 struct ib_device *ib_dev; 320 int srcu_key; 321 322 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 323 ib_dev = srcu_dereference(file->device->ib_dev, 324 &file->device->disassociate_srcu); 325 if (ib_dev && !ib_dev->disassociate_ucontext) 326 module_put(ib_dev->owner); 327 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 328 329 if (atomic_dec_and_test(&file->device->refcount)) 330 ib_uverbs_comp_dev(file->device); 331 332 kfree(file); 333 } 334 335 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 336 size_t count, loff_t *pos) 337 { 338 struct ib_uverbs_event_file *file = filp->private_data; 339 struct ib_uverbs_event *event; 340 int eventsz; 341 int ret = 0; 342 343 spin_lock_irq(&file->lock); 344 345 while (list_empty(&file->event_list)) { 346 spin_unlock_irq(&file->lock); 347 348 if (filp->f_flags & O_NONBLOCK) 349 return -EAGAIN; 350 351 if (wait_event_interruptible(file->poll_wait, 352 (!list_empty(&file->event_list) || 353 /* The barriers built into wait_event_interruptible() 354 * and wake_up() guarentee this will see the null set 355 * without using RCU 356 */ 357 !file->uverbs_file->device->ib_dev))) 358 return -ERESTARTSYS; 359 360 /* If device was disassociated and no event exists set an error */ 361 if (list_empty(&file->event_list) && 362 !file->uverbs_file->device->ib_dev) 363 return -EIO; 364 365 spin_lock_irq(&file->lock); 366 } 367 368 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 369 370 if (file->is_async) 371 eventsz = sizeof (struct ib_uverbs_async_event_desc); 372 else 373 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 374 375 if (eventsz > count) { 376 ret = -EINVAL; 377 event = NULL; 378 } else { 379 list_del(file->event_list.next); 380 if (event->counter) { 381 ++(*event->counter); 382 list_del(&event->obj_list); 383 } 384 } 385 386 spin_unlock_irq(&file->lock); 387 388 if (event) { 389 if (copy_to_user(buf, event, eventsz)) 390 ret = -EFAULT; 391 else 392 ret = eventsz; 393 } 394 395 kfree(event); 396 397 return ret; 398 } 399 400 static unsigned int ib_uverbs_event_poll(struct file *filp, 401 struct poll_table_struct *wait) 402 { 403 unsigned int pollflags = 0; 404 struct ib_uverbs_event_file *file = filp->private_data; 405 406 poll_wait(filp, &file->poll_wait, wait); 407 408 spin_lock_irq(&file->lock); 409 if (!list_empty(&file->event_list)) 410 pollflags = POLLIN | POLLRDNORM; 411 spin_unlock_irq(&file->lock); 412 413 return pollflags; 414 } 415 416 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 417 { 418 struct ib_uverbs_event_file *file = filp->private_data; 419 420 return fasync_helper(fd, filp, on, &file->async_queue); 421 } 422 423 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 424 { 425 struct ib_uverbs_event_file *file = filp->private_data; 426 struct ib_uverbs_event *entry, *tmp; 427 int closed_already = 0; 428 429 mutex_lock(&file->uverbs_file->device->lists_mutex); 430 spin_lock_irq(&file->lock); 431 closed_already = file->is_closed; 432 file->is_closed = 1; 433 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 434 if (entry->counter) 435 list_del(&entry->obj_list); 436 kfree(entry); 437 } 438 spin_unlock_irq(&file->lock); 439 if (!closed_already) { 440 list_del(&file->list); 441 if (file->is_async) 442 ib_unregister_event_handler(&file->uverbs_file-> 443 event_handler); 444 } 445 mutex_unlock(&file->uverbs_file->device->lists_mutex); 446 447 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 448 kref_put(&file->ref, ib_uverbs_release_event_file); 449 450 return 0; 451 } 452 453 static const struct file_operations uverbs_event_fops = { 454 .owner = THIS_MODULE, 455 .read = ib_uverbs_event_read, 456 .poll = ib_uverbs_event_poll, 457 .release = ib_uverbs_event_close, 458 .fasync = ib_uverbs_event_fasync, 459 .llseek = no_llseek, 460 }; 461 462 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 463 { 464 struct ib_uverbs_event_file *file = cq_context; 465 struct ib_ucq_object *uobj; 466 struct ib_uverbs_event *entry; 467 unsigned long flags; 468 469 if (!file) 470 return; 471 472 spin_lock_irqsave(&file->lock, flags); 473 if (file->is_closed) { 474 spin_unlock_irqrestore(&file->lock, flags); 475 return; 476 } 477 478 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 479 if (!entry) { 480 spin_unlock_irqrestore(&file->lock, flags); 481 return; 482 } 483 484 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 485 486 entry->desc.comp.cq_handle = cq->uobject->user_handle; 487 entry->counter = &uobj->comp_events_reported; 488 489 list_add_tail(&entry->list, &file->event_list); 490 list_add_tail(&entry->obj_list, &uobj->comp_list); 491 spin_unlock_irqrestore(&file->lock, flags); 492 493 wake_up_interruptible(&file->poll_wait); 494 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 495 } 496 497 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 498 __u64 element, __u64 event, 499 struct list_head *obj_list, 500 u32 *counter) 501 { 502 struct ib_uverbs_event *entry; 503 unsigned long flags; 504 505 spin_lock_irqsave(&file->async_file->lock, flags); 506 if (file->async_file->is_closed) { 507 spin_unlock_irqrestore(&file->async_file->lock, flags); 508 return; 509 } 510 511 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 512 if (!entry) { 513 spin_unlock_irqrestore(&file->async_file->lock, flags); 514 return; 515 } 516 517 entry->desc.async.element = element; 518 entry->desc.async.event_type = event; 519 entry->desc.async.reserved = 0; 520 entry->counter = counter; 521 522 list_add_tail(&entry->list, &file->async_file->event_list); 523 if (obj_list) 524 list_add_tail(&entry->obj_list, obj_list); 525 spin_unlock_irqrestore(&file->async_file->lock, flags); 526 527 wake_up_interruptible(&file->async_file->poll_wait); 528 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 529 } 530 531 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 532 { 533 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 534 struct ib_ucq_object, uobject); 535 536 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 537 event->event, &uobj->async_list, 538 &uobj->async_events_reported); 539 } 540 541 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 542 { 543 struct ib_uevent_object *uobj; 544 545 /* for XRC target qp's, check that qp is live */ 546 if (!event->element.qp->uobject || !event->element.qp->uobject->live) 547 return; 548 549 uobj = container_of(event->element.qp->uobject, 550 struct ib_uevent_object, uobject); 551 552 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 553 event->event, &uobj->event_list, 554 &uobj->events_reported); 555 } 556 557 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 558 { 559 struct ib_uevent_object *uobj; 560 561 uobj = container_of(event->element.srq->uobject, 562 struct ib_uevent_object, uobject); 563 564 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 565 event->event, &uobj->event_list, 566 &uobj->events_reported); 567 } 568 569 void ib_uverbs_event_handler(struct ib_event_handler *handler, 570 struct ib_event *event) 571 { 572 struct ib_uverbs_file *file = 573 container_of(handler, struct ib_uverbs_file, event_handler); 574 575 ib_uverbs_async_handler(file, event->element.port_num, event->event, 576 NULL, NULL); 577 } 578 579 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 580 { 581 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 582 file->async_file = NULL; 583 } 584 585 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 586 struct ib_device *ib_dev, 587 int is_async) 588 { 589 struct ib_uverbs_event_file *ev_file; 590 struct file *filp; 591 int ret; 592 593 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 594 if (!ev_file) 595 return ERR_PTR(-ENOMEM); 596 597 kref_init(&ev_file->ref); 598 spin_lock_init(&ev_file->lock); 599 INIT_LIST_HEAD(&ev_file->event_list); 600 init_waitqueue_head(&ev_file->poll_wait); 601 ev_file->uverbs_file = uverbs_file; 602 kref_get(&ev_file->uverbs_file->ref); 603 ev_file->async_queue = NULL; 604 ev_file->is_closed = 0; 605 606 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 607 ev_file, O_RDONLY); 608 if (IS_ERR(filp)) 609 goto err_put_refs; 610 611 mutex_lock(&uverbs_file->device->lists_mutex); 612 list_add_tail(&ev_file->list, 613 &uverbs_file->device->uverbs_events_file_list); 614 mutex_unlock(&uverbs_file->device->lists_mutex); 615 616 if (is_async) { 617 WARN_ON(uverbs_file->async_file); 618 uverbs_file->async_file = ev_file; 619 kref_get(&uverbs_file->async_file->ref); 620 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 621 ib_dev, 622 ib_uverbs_event_handler); 623 ret = ib_register_event_handler(&uverbs_file->event_handler); 624 if (ret) 625 goto err_put_file; 626 627 /* At that point async file stuff was fully set */ 628 ev_file->is_async = 1; 629 } 630 631 return filp; 632 633 err_put_file: 634 fput(filp); 635 kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file); 636 uverbs_file->async_file = NULL; 637 return ERR_PTR(ret); 638 639 err_put_refs: 640 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 641 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 642 return filp; 643 } 644 645 /* 646 * Look up a completion event file by FD. If lookup is successful, 647 * takes a ref to the event file struct that it returns; if 648 * unsuccessful, returns NULL. 649 */ 650 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 651 { 652 struct ib_uverbs_event_file *ev_file = NULL; 653 struct fd f = fdget(fd); 654 655 if (!f.file) 656 return NULL; 657 658 if (f.file->f_op != &uverbs_event_fops) 659 goto out; 660 661 ev_file = f.file->private_data; 662 if (ev_file->is_async) { 663 ev_file = NULL; 664 goto out; 665 } 666 667 kref_get(&ev_file->ref); 668 669 out: 670 fdput(f); 671 return ev_file; 672 } 673 674 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 675 size_t count, loff_t *pos) 676 { 677 struct ib_uverbs_file *file = filp->private_data; 678 struct ib_device *ib_dev; 679 struct ib_uverbs_cmd_hdr hdr; 680 __u32 flags; 681 int srcu_key; 682 ssize_t ret; 683 684 if (count < sizeof hdr) 685 return -EINVAL; 686 687 if (copy_from_user(&hdr, buf, sizeof hdr)) 688 return -EFAULT; 689 690 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 691 ib_dev = srcu_dereference(file->device->ib_dev, 692 &file->device->disassociate_srcu); 693 if (!ib_dev) { 694 ret = -EIO; 695 goto out; 696 } 697 698 flags = (hdr.command & 699 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 700 701 if (!flags) { 702 __u32 command; 703 704 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 705 IB_USER_VERBS_CMD_COMMAND_MASK)) { 706 ret = -EINVAL; 707 goto out; 708 } 709 710 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 711 712 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 713 !uverbs_cmd_table[command]) { 714 ret = -EINVAL; 715 goto out; 716 } 717 718 if (!file->ucontext && 719 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 720 ret = -EINVAL; 721 goto out; 722 } 723 724 if (!(ib_dev->uverbs_cmd_mask & (1ull << command))) { 725 ret = -ENOSYS; 726 goto out; 727 } 728 729 if (hdr.in_words * 4 != count) { 730 ret = -EINVAL; 731 goto out; 732 } 733 734 ret = uverbs_cmd_table[command](file, ib_dev, 735 buf + sizeof(hdr), 736 hdr.in_words * 4, 737 hdr.out_words * 4); 738 739 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 740 __u32 command; 741 742 struct ib_uverbs_ex_cmd_hdr ex_hdr; 743 struct ib_udata ucore; 744 struct ib_udata uhw; 745 size_t written_count = count; 746 747 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 748 IB_USER_VERBS_CMD_COMMAND_MASK)) { 749 ret = -EINVAL; 750 goto out; 751 } 752 753 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 754 755 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 756 !uverbs_ex_cmd_table[command]) { 757 ret = -ENOSYS; 758 goto out; 759 } 760 761 if (!file->ucontext) { 762 ret = -EINVAL; 763 goto out; 764 } 765 766 if (!(ib_dev->uverbs_ex_cmd_mask & (1ull << command))) { 767 ret = -ENOSYS; 768 goto out; 769 } 770 771 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 772 ret = -EINVAL; 773 goto out; 774 } 775 776 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 777 ret = -EFAULT; 778 goto out; 779 } 780 781 count -= sizeof(hdr) + sizeof(ex_hdr); 782 buf += sizeof(hdr) + sizeof(ex_hdr); 783 784 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 785 ret = -EINVAL; 786 goto out; 787 } 788 789 if (ex_hdr.cmd_hdr_reserved) { 790 ret = -EINVAL; 791 goto out; 792 } 793 794 if (ex_hdr.response) { 795 if (!hdr.out_words && !ex_hdr.provider_out_words) { 796 ret = -EINVAL; 797 goto out; 798 } 799 800 if (!access_ok(VERIFY_WRITE, 801 (void __user *) (unsigned long) ex_hdr.response, 802 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 803 ret = -EFAULT; 804 goto out; 805 } 806 } else { 807 if (hdr.out_words || ex_hdr.provider_out_words) { 808 ret = -EINVAL; 809 goto out; 810 } 811 } 812 813 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, 814 hdr.in_words * 8, hdr.out_words * 8); 815 816 INIT_UDATA_BUF_OR_NULL(&uhw, 817 buf + ucore.inlen, 818 (unsigned long) ex_hdr.response + ucore.outlen, 819 ex_hdr.provider_in_words * 8, 820 ex_hdr.provider_out_words * 8); 821 822 ret = uverbs_ex_cmd_table[command](file, 823 ib_dev, 824 &ucore, 825 &uhw); 826 if (!ret) 827 ret = written_count; 828 } else { 829 ret = -ENOSYS; 830 } 831 832 out: 833 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 834 return ret; 835 } 836 837 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 838 { 839 struct ib_uverbs_file *file = filp->private_data; 840 struct ib_device *ib_dev; 841 int ret = 0; 842 int srcu_key; 843 844 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 845 ib_dev = srcu_dereference(file->device->ib_dev, 846 &file->device->disassociate_srcu); 847 if (!ib_dev) { 848 ret = -EIO; 849 goto out; 850 } 851 852 if (!file->ucontext) 853 ret = -ENODEV; 854 else 855 ret = ib_dev->mmap(file->ucontext, vma); 856 out: 857 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 858 return ret; 859 } 860 861 /* 862 * ib_uverbs_open() does not need the BKL: 863 * 864 * - the ib_uverbs_device structures are properly reference counted and 865 * everything else is purely local to the file being created, so 866 * races against other open calls are not a problem; 867 * - there is no ioctl method to race against; 868 * - the open method will either immediately run -ENXIO, or all 869 * required initialization will be done. 870 */ 871 static int ib_uverbs_open(struct inode *inode, struct file *filp) 872 { 873 struct ib_uverbs_device *dev; 874 struct ib_uverbs_file *file; 875 struct ib_device *ib_dev; 876 int ret; 877 int module_dependent; 878 int srcu_key; 879 880 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 881 if (!atomic_inc_not_zero(&dev->refcount)) 882 return -ENXIO; 883 884 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 885 mutex_lock(&dev->lists_mutex); 886 ib_dev = srcu_dereference(dev->ib_dev, 887 &dev->disassociate_srcu); 888 if (!ib_dev) { 889 ret = -EIO; 890 goto err; 891 } 892 893 /* In case IB device supports disassociate ucontext, there is no hard 894 * dependency between uverbs device and its low level device. 895 */ 896 module_dependent = !(ib_dev->disassociate_ucontext); 897 898 if (module_dependent) { 899 if (!try_module_get(ib_dev->owner)) { 900 ret = -ENODEV; 901 goto err; 902 } 903 } 904 905 file = kzalloc(sizeof(*file), GFP_KERNEL); 906 if (!file) { 907 ret = -ENOMEM; 908 if (module_dependent) 909 goto err_module; 910 911 goto err; 912 } 913 914 file->device = dev; 915 file->ucontext = NULL; 916 file->async_file = NULL; 917 kref_init(&file->ref); 918 mutex_init(&file->mutex); 919 920 filp->private_data = file; 921 kobject_get(&dev->kobj); 922 list_add_tail(&file->list, &dev->uverbs_file_list); 923 mutex_unlock(&dev->lists_mutex); 924 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 925 926 return nonseekable_open(inode, filp); 927 928 err_module: 929 module_put(ib_dev->owner); 930 931 err: 932 mutex_unlock(&dev->lists_mutex); 933 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 934 if (atomic_dec_and_test(&dev->refcount)) 935 ib_uverbs_comp_dev(dev); 936 937 return ret; 938 } 939 940 static int ib_uverbs_close(struct inode *inode, struct file *filp) 941 { 942 struct ib_uverbs_file *file = filp->private_data; 943 struct ib_uverbs_device *dev = file->device; 944 struct ib_ucontext *ucontext = NULL; 945 946 mutex_lock(&file->device->lists_mutex); 947 ucontext = file->ucontext; 948 file->ucontext = NULL; 949 if (!file->is_closed) { 950 list_del(&file->list); 951 file->is_closed = 1; 952 } 953 mutex_unlock(&file->device->lists_mutex); 954 if (ucontext) 955 ib_uverbs_cleanup_ucontext(file, ucontext); 956 957 if (file->async_file) 958 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 959 960 kref_put(&file->ref, ib_uverbs_release_file); 961 kobject_put(&dev->kobj); 962 963 return 0; 964 } 965 966 static const struct file_operations uverbs_fops = { 967 .owner = THIS_MODULE, 968 .write = ib_uverbs_write, 969 .open = ib_uverbs_open, 970 .release = ib_uverbs_close, 971 .llseek = no_llseek, 972 }; 973 974 static const struct file_operations uverbs_mmap_fops = { 975 .owner = THIS_MODULE, 976 .write = ib_uverbs_write, 977 .mmap = ib_uverbs_mmap, 978 .open = ib_uverbs_open, 979 .release = ib_uverbs_close, 980 .llseek = no_llseek, 981 }; 982 983 static struct ib_client uverbs_client = { 984 .name = "uverbs", 985 .add = ib_uverbs_add_one, 986 .remove = ib_uverbs_remove_one 987 }; 988 989 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 990 char *buf) 991 { 992 int ret = -ENODEV; 993 int srcu_key; 994 struct ib_uverbs_device *dev = dev_get_drvdata(device); 995 struct ib_device *ib_dev; 996 997 if (!dev) 998 return -ENODEV; 999 1000 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1001 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1002 if (ib_dev) 1003 ret = sprintf(buf, "%s\n", ib_dev->name); 1004 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1005 1006 return ret; 1007 } 1008 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 1009 1010 static ssize_t show_dev_abi_version(struct device *device, 1011 struct device_attribute *attr, char *buf) 1012 { 1013 struct ib_uverbs_device *dev = dev_get_drvdata(device); 1014 int ret = -ENODEV; 1015 int srcu_key; 1016 struct ib_device *ib_dev; 1017 1018 if (!dev) 1019 return -ENODEV; 1020 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1021 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1022 if (ib_dev) 1023 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 1024 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1025 1026 return ret; 1027 } 1028 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1029 1030 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1031 __stringify(IB_USER_VERBS_ABI_VERSION)); 1032 1033 static dev_t overflow_maj; 1034 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1035 1036 /* 1037 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1038 * requesting a new major number and doubling the number of max devices we 1039 * support. It's stupid, but simple. 1040 */ 1041 static int find_overflow_devnum(void) 1042 { 1043 int ret; 1044 1045 if (!overflow_maj) { 1046 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1047 "infiniband_verbs"); 1048 if (ret) { 1049 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 1050 return ret; 1051 } 1052 } 1053 1054 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1055 if (ret >= IB_UVERBS_MAX_DEVICES) 1056 return -1; 1057 1058 return ret; 1059 } 1060 1061 static void ib_uverbs_add_one(struct ib_device *device) 1062 { 1063 int devnum; 1064 dev_t base; 1065 struct ib_uverbs_device *uverbs_dev; 1066 int ret; 1067 1068 if (!device->alloc_ucontext) 1069 return; 1070 1071 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1072 if (!uverbs_dev) 1073 return; 1074 1075 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1076 if (ret) { 1077 kfree(uverbs_dev); 1078 return; 1079 } 1080 1081 atomic_set(&uverbs_dev->refcount, 1); 1082 init_completion(&uverbs_dev->comp); 1083 uverbs_dev->xrcd_tree = RB_ROOT; 1084 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1085 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1086 mutex_init(&uverbs_dev->lists_mutex); 1087 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1088 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1089 1090 spin_lock(&map_lock); 1091 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1092 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1093 spin_unlock(&map_lock); 1094 devnum = find_overflow_devnum(); 1095 if (devnum < 0) 1096 goto err; 1097 1098 spin_lock(&map_lock); 1099 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1100 base = devnum + overflow_maj; 1101 set_bit(devnum, overflow_map); 1102 } else { 1103 uverbs_dev->devnum = devnum; 1104 base = devnum + IB_UVERBS_BASE_DEV; 1105 set_bit(devnum, dev_map); 1106 } 1107 spin_unlock(&map_lock); 1108 1109 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1110 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1111 1112 cdev_init(&uverbs_dev->cdev, NULL); 1113 uverbs_dev->cdev.owner = THIS_MODULE; 1114 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1115 uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj; 1116 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1117 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1118 goto err_cdev; 1119 1120 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 1121 uverbs_dev->cdev.dev, uverbs_dev, 1122 "uverbs%d", uverbs_dev->devnum); 1123 if (IS_ERR(uverbs_dev->dev)) 1124 goto err_cdev; 1125 1126 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1127 goto err_class; 1128 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1129 goto err_class; 1130 1131 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1132 1133 return; 1134 1135 err_class: 1136 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1137 1138 err_cdev: 1139 cdev_del(&uverbs_dev->cdev); 1140 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1141 clear_bit(devnum, dev_map); 1142 else 1143 clear_bit(devnum, overflow_map); 1144 1145 err: 1146 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1147 ib_uverbs_comp_dev(uverbs_dev); 1148 wait_for_completion(&uverbs_dev->comp); 1149 kobject_put(&uverbs_dev->kobj); 1150 return; 1151 } 1152 1153 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1154 struct ib_device *ib_dev) 1155 { 1156 struct ib_uverbs_file *file; 1157 struct ib_uverbs_event_file *event_file; 1158 struct ib_event event; 1159 1160 /* Pending running commands to terminate */ 1161 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1162 event.event = IB_EVENT_DEVICE_FATAL; 1163 event.element.port_num = 0; 1164 event.device = ib_dev; 1165 1166 mutex_lock(&uverbs_dev->lists_mutex); 1167 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1168 struct ib_ucontext *ucontext; 1169 1170 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1171 struct ib_uverbs_file, list); 1172 file->is_closed = 1; 1173 ucontext = file->ucontext; 1174 list_del(&file->list); 1175 file->ucontext = NULL; 1176 kref_get(&file->ref); 1177 mutex_unlock(&uverbs_dev->lists_mutex); 1178 /* We must release the mutex before going ahead and calling 1179 * disassociate_ucontext. disassociate_ucontext might end up 1180 * indirectly calling uverbs_close, for example due to freeing 1181 * the resources (e.g mmput). 1182 */ 1183 ib_uverbs_event_handler(&file->event_handler, &event); 1184 if (ucontext) { 1185 ib_dev->disassociate_ucontext(ucontext); 1186 ib_uverbs_cleanup_ucontext(file, ucontext); 1187 } 1188 1189 mutex_lock(&uverbs_dev->lists_mutex); 1190 kref_put(&file->ref, ib_uverbs_release_file); 1191 } 1192 1193 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1194 event_file = list_first_entry(&uverbs_dev-> 1195 uverbs_events_file_list, 1196 struct ib_uverbs_event_file, 1197 list); 1198 spin_lock_irq(&event_file->lock); 1199 event_file->is_closed = 1; 1200 spin_unlock_irq(&event_file->lock); 1201 1202 list_del(&event_file->list); 1203 if (event_file->is_async) { 1204 ib_unregister_event_handler(&event_file->uverbs_file-> 1205 event_handler); 1206 event_file->uverbs_file->event_handler.device = NULL; 1207 } 1208 1209 wake_up_interruptible(&event_file->poll_wait); 1210 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN); 1211 } 1212 mutex_unlock(&uverbs_dev->lists_mutex); 1213 } 1214 1215 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1216 { 1217 struct ib_uverbs_device *uverbs_dev = client_data; 1218 int wait_clients = 1; 1219 1220 if (!uverbs_dev) 1221 return; 1222 1223 dev_set_drvdata(uverbs_dev->dev, NULL); 1224 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1225 cdev_del(&uverbs_dev->cdev); 1226 1227 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1228 clear_bit(uverbs_dev->devnum, dev_map); 1229 else 1230 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1231 1232 if (device->disassociate_ucontext) { 1233 /* We disassociate HW resources and immediately return. 1234 * Userspace will see a EIO errno for all future access. 1235 * Upon returning, ib_device may be freed internally and is not 1236 * valid any more. 1237 * uverbs_device is still available until all clients close 1238 * their files, then the uverbs device ref count will be zero 1239 * and its resources will be freed. 1240 * Note: At this point no more files can be opened since the 1241 * cdev was deleted, however active clients can still issue 1242 * commands and close their open files. 1243 */ 1244 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1245 ib_uverbs_free_hw_resources(uverbs_dev, device); 1246 wait_clients = 0; 1247 } 1248 1249 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1250 ib_uverbs_comp_dev(uverbs_dev); 1251 if (wait_clients) 1252 wait_for_completion(&uverbs_dev->comp); 1253 kobject_put(&uverbs_dev->kobj); 1254 } 1255 1256 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1257 { 1258 if (mode) 1259 *mode = 0666; 1260 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1261 } 1262 1263 static int __init ib_uverbs_init(void) 1264 { 1265 int ret; 1266 1267 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1268 "infiniband_verbs"); 1269 if (ret) { 1270 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 1271 goto out; 1272 } 1273 1274 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1275 if (IS_ERR(uverbs_class)) { 1276 ret = PTR_ERR(uverbs_class); 1277 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 1278 goto out_chrdev; 1279 } 1280 1281 uverbs_class->devnode = uverbs_devnode; 1282 1283 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1284 if (ret) { 1285 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 1286 goto out_class; 1287 } 1288 1289 ret = ib_register_client(&uverbs_client); 1290 if (ret) { 1291 printk(KERN_ERR "user_verbs: couldn't register client\n"); 1292 goto out_class; 1293 } 1294 1295 return 0; 1296 1297 out_class: 1298 class_destroy(uverbs_class); 1299 1300 out_chrdev: 1301 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1302 1303 out: 1304 return ret; 1305 } 1306 1307 static void __exit ib_uverbs_cleanup(void) 1308 { 1309 ib_unregister_client(&uverbs_client); 1310 class_destroy(uverbs_class); 1311 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1312 if (overflow_maj) 1313 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1314 idr_destroy(&ib_uverbs_pd_idr); 1315 idr_destroy(&ib_uverbs_mr_idr); 1316 idr_destroy(&ib_uverbs_mw_idr); 1317 idr_destroy(&ib_uverbs_ah_idr); 1318 idr_destroy(&ib_uverbs_cq_idr); 1319 idr_destroy(&ib_uverbs_qp_idr); 1320 idr_destroy(&ib_uverbs_srq_idr); 1321 } 1322 1323 module_init(ib_uverbs_init); 1324 module_exit(ib_uverbs_cleanup); 1325