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