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 53 #include "uverbs.h" 54 #include "core_priv.h" 55 #include "rdma_core.h" 56 57 MODULE_AUTHOR("Roland Dreier"); 58 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 59 MODULE_LICENSE("Dual BSD/GPL"); 60 61 enum { 62 IB_UVERBS_MAJOR = 231, 63 IB_UVERBS_BASE_MINOR = 192, 64 IB_UVERBS_MAX_DEVICES = 32 65 }; 66 67 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 68 69 static struct class *uverbs_class; 70 71 static DEFINE_SPINLOCK(map_lock); 72 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 73 74 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 75 struct ib_device *ib_dev, 76 const char __user *buf, int in_len, 77 int out_len) = { 78 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 79 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 80 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 81 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 82 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 83 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 84 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 85 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 86 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 87 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 88 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 89 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 90 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 91 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 92 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 93 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 94 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 95 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 96 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 97 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 98 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 99 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 100 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 101 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 102 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 103 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 104 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 105 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 106 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 107 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 108 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 109 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 110 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 111 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 112 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 113 }; 114 115 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 116 struct ib_device *ib_dev, 117 struct ib_udata *ucore, 118 struct ib_udata *uhw) = { 119 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 120 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 121 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 122 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 123 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 124 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, 125 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, 126 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, 127 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, 128 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, 129 [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp, 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 int uverbs_dealloc_mw(struct ib_mw *mw) 136 { 137 struct ib_pd *pd = mw->pd; 138 int ret; 139 140 ret = mw->device->dealloc_mw(mw); 141 if (!ret) 142 atomic_dec(&pd->usecnt); 143 return ret; 144 } 145 146 static void ib_uverbs_release_dev(struct kobject *kobj) 147 { 148 struct ib_uverbs_device *dev = 149 container_of(kobj, struct ib_uverbs_device, kobj); 150 151 cleanup_srcu_struct(&dev->disassociate_srcu); 152 kfree(dev); 153 } 154 155 static struct kobj_type ib_uverbs_dev_ktype = { 156 .release = ib_uverbs_release_dev, 157 }; 158 159 static void ib_uverbs_release_async_event_file(struct kref *ref) 160 { 161 struct ib_uverbs_async_event_file *file = 162 container_of(ref, struct ib_uverbs_async_event_file, ref); 163 164 kfree(file); 165 } 166 167 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 168 struct ib_uverbs_completion_event_file *ev_file, 169 struct ib_ucq_object *uobj) 170 { 171 struct ib_uverbs_event *evt, *tmp; 172 173 if (ev_file) { 174 spin_lock_irq(&ev_file->ev_queue.lock); 175 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 176 list_del(&evt->list); 177 kfree(evt); 178 } 179 spin_unlock_irq(&ev_file->ev_queue.lock); 180 181 uverbs_uobject_put(&ev_file->uobj_file.uobj); 182 } 183 184 spin_lock_irq(&file->async_file->ev_queue.lock); 185 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 186 list_del(&evt->list); 187 kfree(evt); 188 } 189 spin_unlock_irq(&file->async_file->ev_queue.lock); 190 } 191 192 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 193 struct ib_uevent_object *uobj) 194 { 195 struct ib_uverbs_event *evt, *tmp; 196 197 spin_lock_irq(&file->async_file->ev_queue.lock); 198 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 199 list_del(&evt->list); 200 kfree(evt); 201 } 202 spin_unlock_irq(&file->async_file->ev_queue.lock); 203 } 204 205 void ib_uverbs_detach_umcast(struct ib_qp *qp, 206 struct ib_uqp_object *uobj) 207 { 208 struct ib_uverbs_mcast_entry *mcast, *tmp; 209 210 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 211 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 212 list_del(&mcast->list); 213 kfree(mcast); 214 } 215 } 216 217 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 218 struct ib_ucontext *context, 219 bool device_removed) 220 { 221 context->closing = 1; 222 uverbs_cleanup_ucontext(context, device_removed); 223 put_pid(context->tgid); 224 225 ib_rdmacg_uncharge(&context->cg_obj, context->device, 226 RDMACG_RESOURCE_HCA_HANDLE); 227 228 return context->device->dealloc_ucontext(context); 229 } 230 231 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 232 { 233 complete(&dev->comp); 234 } 235 236 void ib_uverbs_release_file(struct kref *ref) 237 { 238 struct ib_uverbs_file *file = 239 container_of(ref, struct ib_uverbs_file, ref); 240 struct ib_device *ib_dev; 241 int srcu_key; 242 243 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 244 ib_dev = srcu_dereference(file->device->ib_dev, 245 &file->device->disassociate_srcu); 246 if (ib_dev && !ib_dev->disassociate_ucontext) 247 module_put(ib_dev->owner); 248 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 249 250 if (atomic_dec_and_test(&file->device->refcount)) 251 ib_uverbs_comp_dev(file->device); 252 253 kobject_put(&file->device->kobj); 254 kfree(file); 255 } 256 257 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, 258 struct ib_uverbs_file *uverbs_file, 259 struct file *filp, char __user *buf, 260 size_t count, loff_t *pos, 261 size_t eventsz) 262 { 263 struct ib_uverbs_event *event; 264 int ret = 0; 265 266 spin_lock_irq(&ev_queue->lock); 267 268 while (list_empty(&ev_queue->event_list)) { 269 spin_unlock_irq(&ev_queue->lock); 270 271 if (filp->f_flags & O_NONBLOCK) 272 return -EAGAIN; 273 274 if (wait_event_interruptible(ev_queue->poll_wait, 275 (!list_empty(&ev_queue->event_list) || 276 /* The barriers built into wait_event_interruptible() 277 * and wake_up() guarentee this will see the null set 278 * without using RCU 279 */ 280 !uverbs_file->device->ib_dev))) 281 return -ERESTARTSYS; 282 283 /* If device was disassociated and no event exists set an error */ 284 if (list_empty(&ev_queue->event_list) && 285 !uverbs_file->device->ib_dev) 286 return -EIO; 287 288 spin_lock_irq(&ev_queue->lock); 289 } 290 291 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); 292 293 if (eventsz > count) { 294 ret = -EINVAL; 295 event = NULL; 296 } else { 297 list_del(ev_queue->event_list.next); 298 if (event->counter) { 299 ++(*event->counter); 300 list_del(&event->obj_list); 301 } 302 } 303 304 spin_unlock_irq(&ev_queue->lock); 305 306 if (event) { 307 if (copy_to_user(buf, event, eventsz)) 308 ret = -EFAULT; 309 else 310 ret = eventsz; 311 } 312 313 kfree(event); 314 315 return ret; 316 } 317 318 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, 319 size_t count, loff_t *pos) 320 { 321 struct ib_uverbs_async_event_file *file = filp->private_data; 322 323 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, 324 buf, count, pos, 325 sizeof(struct ib_uverbs_async_event_desc)); 326 } 327 328 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, 329 size_t count, loff_t *pos) 330 { 331 struct ib_uverbs_completion_event_file *comp_ev_file = 332 filp->private_data; 333 334 return ib_uverbs_event_read(&comp_ev_file->ev_queue, 335 comp_ev_file->uobj_file.ufile, filp, 336 buf, count, pos, 337 sizeof(struct ib_uverbs_comp_event_desc)); 338 } 339 340 static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, 341 struct file *filp, 342 struct poll_table_struct *wait) 343 { 344 unsigned int pollflags = 0; 345 346 poll_wait(filp, &ev_queue->poll_wait, wait); 347 348 spin_lock_irq(&ev_queue->lock); 349 if (!list_empty(&ev_queue->event_list)) 350 pollflags = POLLIN | POLLRDNORM; 351 spin_unlock_irq(&ev_queue->lock); 352 353 return pollflags; 354 } 355 356 static unsigned int ib_uverbs_async_event_poll(struct file *filp, 357 struct poll_table_struct *wait) 358 { 359 return ib_uverbs_event_poll(filp->private_data, filp, wait); 360 } 361 362 static unsigned int ib_uverbs_comp_event_poll(struct file *filp, 363 struct poll_table_struct *wait) 364 { 365 struct ib_uverbs_completion_event_file *comp_ev_file = 366 filp->private_data; 367 368 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); 369 } 370 371 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) 372 { 373 struct ib_uverbs_event_queue *ev_queue = filp->private_data; 374 375 return fasync_helper(fd, filp, on, &ev_queue->async_queue); 376 } 377 378 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) 379 { 380 struct ib_uverbs_completion_event_file *comp_ev_file = 381 filp->private_data; 382 383 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); 384 } 385 386 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) 387 { 388 struct ib_uverbs_async_event_file *file = filp->private_data; 389 struct ib_uverbs_file *uverbs_file = file->uverbs_file; 390 struct ib_uverbs_event *entry, *tmp; 391 int closed_already = 0; 392 393 mutex_lock(&uverbs_file->device->lists_mutex); 394 spin_lock_irq(&file->ev_queue.lock); 395 closed_already = file->ev_queue.is_closed; 396 file->ev_queue.is_closed = 1; 397 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 398 if (entry->counter) 399 list_del(&entry->obj_list); 400 kfree(entry); 401 } 402 spin_unlock_irq(&file->ev_queue.lock); 403 if (!closed_already) { 404 list_del(&file->list); 405 ib_unregister_event_handler(&uverbs_file->event_handler); 406 } 407 mutex_unlock(&uverbs_file->device->lists_mutex); 408 409 kref_put(&uverbs_file->ref, ib_uverbs_release_file); 410 kref_put(&file->ref, ib_uverbs_release_async_event_file); 411 412 return 0; 413 } 414 415 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) 416 { 417 struct ib_uverbs_completion_event_file *file = filp->private_data; 418 struct ib_uverbs_event *entry, *tmp; 419 420 spin_lock_irq(&file->ev_queue.lock); 421 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 422 if (entry->counter) 423 list_del(&entry->obj_list); 424 kfree(entry); 425 } 426 spin_unlock_irq(&file->ev_queue.lock); 427 428 uverbs_close_fd(filp); 429 430 return 0; 431 } 432 433 const struct file_operations uverbs_event_fops = { 434 .owner = THIS_MODULE, 435 .read = ib_uverbs_comp_event_read, 436 .poll = ib_uverbs_comp_event_poll, 437 .release = ib_uverbs_comp_event_close, 438 .fasync = ib_uverbs_comp_event_fasync, 439 .llseek = no_llseek, 440 }; 441 442 static const struct file_operations uverbs_async_event_fops = { 443 .owner = THIS_MODULE, 444 .read = ib_uverbs_async_event_read, 445 .poll = ib_uverbs_async_event_poll, 446 .release = ib_uverbs_async_event_close, 447 .fasync = ib_uverbs_async_event_fasync, 448 .llseek = no_llseek, 449 }; 450 451 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 452 { 453 struct ib_uverbs_event_queue *ev_queue = cq_context; 454 struct ib_ucq_object *uobj; 455 struct ib_uverbs_event *entry; 456 unsigned long flags; 457 458 if (!ev_queue) 459 return; 460 461 spin_lock_irqsave(&ev_queue->lock, flags); 462 if (ev_queue->is_closed) { 463 spin_unlock_irqrestore(&ev_queue->lock, flags); 464 return; 465 } 466 467 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 468 if (!entry) { 469 spin_unlock_irqrestore(&ev_queue->lock, flags); 470 return; 471 } 472 473 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 474 475 entry->desc.comp.cq_handle = cq->uobject->user_handle; 476 entry->counter = &uobj->comp_events_reported; 477 478 list_add_tail(&entry->list, &ev_queue->event_list); 479 list_add_tail(&entry->obj_list, &uobj->comp_list); 480 spin_unlock_irqrestore(&ev_queue->lock, flags); 481 482 wake_up_interruptible(&ev_queue->poll_wait); 483 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); 484 } 485 486 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 487 __u64 element, __u64 event, 488 struct list_head *obj_list, 489 u32 *counter) 490 { 491 struct ib_uverbs_event *entry; 492 unsigned long flags; 493 494 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags); 495 if (file->async_file->ev_queue.is_closed) { 496 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 497 return; 498 } 499 500 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 501 if (!entry) { 502 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 503 return; 504 } 505 506 entry->desc.async.element = element; 507 entry->desc.async.event_type = event; 508 entry->desc.async.reserved = 0; 509 entry->counter = counter; 510 511 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list); 512 if (obj_list) 513 list_add_tail(&entry->obj_list, obj_list); 514 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 515 516 wake_up_interruptible(&file->async_file->ev_queue.poll_wait); 517 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN); 518 } 519 520 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 521 { 522 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 523 struct ib_ucq_object, uobject); 524 525 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 526 event->event, &uobj->async_list, 527 &uobj->async_events_reported); 528 } 529 530 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 531 { 532 struct ib_uevent_object *uobj; 533 534 /* for XRC target qp's, check that qp is live */ 535 if (!event->element.qp->uobject) 536 return; 537 538 uobj = container_of(event->element.qp->uobject, 539 struct ib_uevent_object, uobject); 540 541 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 542 event->event, &uobj->event_list, 543 &uobj->events_reported); 544 } 545 546 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 547 { 548 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 549 struct ib_uevent_object, uobject); 550 551 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 552 event->event, &uobj->event_list, 553 &uobj->events_reported); 554 } 555 556 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 557 { 558 struct ib_uevent_object *uobj; 559 560 uobj = container_of(event->element.srq->uobject, 561 struct ib_uevent_object, uobject); 562 563 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 564 event->event, &uobj->event_list, 565 &uobj->events_reported); 566 } 567 568 void ib_uverbs_event_handler(struct ib_event_handler *handler, 569 struct ib_event *event) 570 { 571 struct ib_uverbs_file *file = 572 container_of(handler, struct ib_uverbs_file, event_handler); 573 574 ib_uverbs_async_handler(file, event->element.port_num, event->event, 575 NULL, NULL); 576 } 577 578 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 579 { 580 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file); 581 file->async_file = NULL; 582 } 583 584 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) 585 { 586 spin_lock_init(&ev_queue->lock); 587 INIT_LIST_HEAD(&ev_queue->event_list); 588 init_waitqueue_head(&ev_queue->poll_wait); 589 ev_queue->is_closed = 0; 590 ev_queue->async_queue = NULL; 591 } 592 593 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, 594 struct ib_device *ib_dev) 595 { 596 struct ib_uverbs_async_event_file *ev_file; 597 struct file *filp; 598 int ret; 599 600 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 601 if (!ev_file) 602 return ERR_PTR(-ENOMEM); 603 604 ib_uverbs_init_event_queue(&ev_file->ev_queue); 605 ev_file->uverbs_file = uverbs_file; 606 kref_get(&ev_file->uverbs_file->ref); 607 kref_init(&ev_file->ref); 608 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops, 609 ev_file, O_RDONLY); 610 if (IS_ERR(filp)) 611 goto err_put_refs; 612 613 mutex_lock(&uverbs_file->device->lists_mutex); 614 list_add_tail(&ev_file->list, 615 &uverbs_file->device->uverbs_events_file_list); 616 mutex_unlock(&uverbs_file->device->lists_mutex); 617 618 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 */ 629 630 return filp; 631 632 err_put_file: 633 fput(filp); 634 kref_put(&uverbs_file->async_file->ref, 635 ib_uverbs_release_async_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_async_event_file); 642 return filp; 643 } 644 645 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 646 { 647 u64 mask; 648 649 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 650 mask = ib_dev->uverbs_cmd_mask; 651 else 652 mask = ib_dev->uverbs_ex_cmd_mask; 653 654 if (mask & ((u64)1 << command)) 655 return 0; 656 657 return -1; 658 } 659 660 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 661 size_t count, loff_t *pos) 662 { 663 struct ib_uverbs_file *file = filp->private_data; 664 struct ib_device *ib_dev; 665 struct ib_uverbs_cmd_hdr hdr; 666 __u32 command; 667 __u32 flags; 668 int srcu_key; 669 ssize_t ret; 670 671 if (!ib_safe_file_access(filp)) { 672 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", 673 task_tgid_vnr(current), current->comm); 674 return -EACCES; 675 } 676 677 if (count < sizeof hdr) 678 return -EINVAL; 679 680 if (copy_from_user(&hdr, buf, sizeof hdr)) 681 return -EFAULT; 682 683 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 684 ib_dev = srcu_dereference(file->device->ib_dev, 685 &file->device->disassociate_srcu); 686 if (!ib_dev) { 687 ret = -EIO; 688 goto out; 689 } 690 691 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 692 IB_USER_VERBS_CMD_COMMAND_MASK)) { 693 ret = -EINVAL; 694 goto out; 695 } 696 697 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 698 if (verify_command_mask(ib_dev, command)) { 699 ret = -EOPNOTSUPP; 700 goto out; 701 } 702 703 if (!file->ucontext && 704 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 705 ret = -EINVAL; 706 goto out; 707 } 708 709 flags = (hdr.command & 710 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 711 712 if (!flags) { 713 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 714 !uverbs_cmd_table[command]) { 715 ret = -EINVAL; 716 goto out; 717 } 718 719 if (hdr.in_words * 4 != count) { 720 ret = -EINVAL; 721 goto out; 722 } 723 724 ret = uverbs_cmd_table[command](file, ib_dev, 725 buf + sizeof(hdr), 726 hdr.in_words * 4, 727 hdr.out_words * 4); 728 729 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 730 struct ib_uverbs_ex_cmd_hdr ex_hdr; 731 struct ib_udata ucore; 732 struct ib_udata uhw; 733 size_t written_count = count; 734 735 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 736 !uverbs_ex_cmd_table[command]) { 737 ret = -ENOSYS; 738 goto out; 739 } 740 741 if (!file->ucontext) { 742 ret = -EINVAL; 743 goto out; 744 } 745 746 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 747 ret = -EINVAL; 748 goto out; 749 } 750 751 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 752 ret = -EFAULT; 753 goto out; 754 } 755 756 count -= sizeof(hdr) + sizeof(ex_hdr); 757 buf += sizeof(hdr) + sizeof(ex_hdr); 758 759 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 760 ret = -EINVAL; 761 goto out; 762 } 763 764 if (ex_hdr.cmd_hdr_reserved) { 765 ret = -EINVAL; 766 goto out; 767 } 768 769 if (ex_hdr.response) { 770 if (!hdr.out_words && !ex_hdr.provider_out_words) { 771 ret = -EINVAL; 772 goto out; 773 } 774 775 if (!access_ok(VERIFY_WRITE, 776 (void __user *) (unsigned long) ex_hdr.response, 777 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 778 ret = -EFAULT; 779 goto out; 780 } 781 } else { 782 if (hdr.out_words || ex_hdr.provider_out_words) { 783 ret = -EINVAL; 784 goto out; 785 } 786 } 787 788 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, 789 hdr.in_words * 8, hdr.out_words * 8); 790 791 INIT_UDATA_BUF_OR_NULL(&uhw, 792 buf + ucore.inlen, 793 (unsigned long) ex_hdr.response + ucore.outlen, 794 ex_hdr.provider_in_words * 8, 795 ex_hdr.provider_out_words * 8); 796 797 ret = uverbs_ex_cmd_table[command](file, 798 ib_dev, 799 &ucore, 800 &uhw); 801 if (!ret) 802 ret = written_count; 803 } else { 804 ret = -ENOSYS; 805 } 806 807 out: 808 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 809 return ret; 810 } 811 812 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 813 { 814 struct ib_uverbs_file *file = filp->private_data; 815 struct ib_device *ib_dev; 816 int ret = 0; 817 int srcu_key; 818 819 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 820 ib_dev = srcu_dereference(file->device->ib_dev, 821 &file->device->disassociate_srcu); 822 if (!ib_dev) { 823 ret = -EIO; 824 goto out; 825 } 826 827 if (!file->ucontext) 828 ret = -ENODEV; 829 else 830 ret = ib_dev->mmap(file->ucontext, vma); 831 out: 832 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 833 return ret; 834 } 835 836 /* 837 * ib_uverbs_open() does not need the BKL: 838 * 839 * - the ib_uverbs_device structures are properly reference counted and 840 * everything else is purely local to the file being created, so 841 * races against other open calls are not a problem; 842 * - there is no ioctl method to race against; 843 * - the open method will either immediately run -ENXIO, or all 844 * required initialization will be done. 845 */ 846 static int ib_uverbs_open(struct inode *inode, struct file *filp) 847 { 848 struct ib_uverbs_device *dev; 849 struct ib_uverbs_file *file; 850 struct ib_device *ib_dev; 851 int ret; 852 int module_dependent; 853 int srcu_key; 854 855 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 856 if (!atomic_inc_not_zero(&dev->refcount)) 857 return -ENXIO; 858 859 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 860 mutex_lock(&dev->lists_mutex); 861 ib_dev = srcu_dereference(dev->ib_dev, 862 &dev->disassociate_srcu); 863 if (!ib_dev) { 864 ret = -EIO; 865 goto err; 866 } 867 868 /* In case IB device supports disassociate ucontext, there is no hard 869 * dependency between uverbs device and its low level device. 870 */ 871 module_dependent = !(ib_dev->disassociate_ucontext); 872 873 if (module_dependent) { 874 if (!try_module_get(ib_dev->owner)) { 875 ret = -ENODEV; 876 goto err; 877 } 878 } 879 880 file = kzalloc(sizeof(*file), GFP_KERNEL); 881 if (!file) { 882 ret = -ENOMEM; 883 if (module_dependent) 884 goto err_module; 885 886 goto err; 887 } 888 889 file->device = dev; 890 spin_lock_init(&file->idr_lock); 891 idr_init(&file->idr); 892 file->ucontext = NULL; 893 file->async_file = NULL; 894 kref_init(&file->ref); 895 mutex_init(&file->mutex); 896 mutex_init(&file->cleanup_mutex); 897 898 filp->private_data = file; 899 kobject_get(&dev->kobj); 900 list_add_tail(&file->list, &dev->uverbs_file_list); 901 mutex_unlock(&dev->lists_mutex); 902 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 903 904 return nonseekable_open(inode, filp); 905 906 err_module: 907 module_put(ib_dev->owner); 908 909 err: 910 mutex_unlock(&dev->lists_mutex); 911 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 912 if (atomic_dec_and_test(&dev->refcount)) 913 ib_uverbs_comp_dev(dev); 914 915 return ret; 916 } 917 918 static int ib_uverbs_close(struct inode *inode, struct file *filp) 919 { 920 struct ib_uverbs_file *file = filp->private_data; 921 922 mutex_lock(&file->cleanup_mutex); 923 if (file->ucontext) { 924 ib_uverbs_cleanup_ucontext(file, file->ucontext, false); 925 file->ucontext = NULL; 926 } 927 mutex_unlock(&file->cleanup_mutex); 928 idr_destroy(&file->idr); 929 930 mutex_lock(&file->device->lists_mutex); 931 if (!file->is_closed) { 932 list_del(&file->list); 933 file->is_closed = 1; 934 } 935 mutex_unlock(&file->device->lists_mutex); 936 937 if (file->async_file) 938 kref_put(&file->async_file->ref, 939 ib_uverbs_release_async_event_file); 940 941 kref_put(&file->ref, ib_uverbs_release_file); 942 943 return 0; 944 } 945 946 static const struct file_operations uverbs_fops = { 947 .owner = THIS_MODULE, 948 .write = ib_uverbs_write, 949 .open = ib_uverbs_open, 950 .release = ib_uverbs_close, 951 .llseek = no_llseek, 952 }; 953 954 static const struct file_operations uverbs_mmap_fops = { 955 .owner = THIS_MODULE, 956 .write = ib_uverbs_write, 957 .mmap = ib_uverbs_mmap, 958 .open = ib_uverbs_open, 959 .release = ib_uverbs_close, 960 .llseek = no_llseek, 961 }; 962 963 static struct ib_client uverbs_client = { 964 .name = "uverbs", 965 .add = ib_uverbs_add_one, 966 .remove = ib_uverbs_remove_one 967 }; 968 969 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 970 char *buf) 971 { 972 int ret = -ENODEV; 973 int srcu_key; 974 struct ib_uverbs_device *dev = dev_get_drvdata(device); 975 struct ib_device *ib_dev; 976 977 if (!dev) 978 return -ENODEV; 979 980 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 981 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 982 if (ib_dev) 983 ret = sprintf(buf, "%s\n", ib_dev->name); 984 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 985 986 return ret; 987 } 988 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 989 990 static ssize_t show_dev_abi_version(struct device *device, 991 struct device_attribute *attr, char *buf) 992 { 993 struct ib_uverbs_device *dev = dev_get_drvdata(device); 994 int ret = -ENODEV; 995 int srcu_key; 996 struct ib_device *ib_dev; 997 998 if (!dev) 999 return -ENODEV; 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, "%d\n", ib_dev->uverbs_abi_ver); 1004 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1005 1006 return ret; 1007 } 1008 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1009 1010 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1011 __stringify(IB_USER_VERBS_ABI_VERSION)); 1012 1013 static dev_t overflow_maj; 1014 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1015 1016 /* 1017 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1018 * requesting a new major number and doubling the number of max devices we 1019 * support. It's stupid, but simple. 1020 */ 1021 static int find_overflow_devnum(void) 1022 { 1023 int ret; 1024 1025 if (!overflow_maj) { 1026 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1027 "infiniband_verbs"); 1028 if (ret) { 1029 pr_err("user_verbs: couldn't register dynamic device number\n"); 1030 return ret; 1031 } 1032 } 1033 1034 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1035 if (ret >= IB_UVERBS_MAX_DEVICES) 1036 return -1; 1037 1038 return ret; 1039 } 1040 1041 static void ib_uverbs_add_one(struct ib_device *device) 1042 { 1043 int devnum; 1044 dev_t base; 1045 struct ib_uverbs_device *uverbs_dev; 1046 int ret; 1047 1048 if (!device->alloc_ucontext) 1049 return; 1050 1051 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1052 if (!uverbs_dev) 1053 return; 1054 1055 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1056 if (ret) { 1057 kfree(uverbs_dev); 1058 return; 1059 } 1060 1061 atomic_set(&uverbs_dev->refcount, 1); 1062 init_completion(&uverbs_dev->comp); 1063 uverbs_dev->xrcd_tree = RB_ROOT; 1064 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1065 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1066 mutex_init(&uverbs_dev->lists_mutex); 1067 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1068 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1069 1070 spin_lock(&map_lock); 1071 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1072 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1073 spin_unlock(&map_lock); 1074 devnum = find_overflow_devnum(); 1075 if (devnum < 0) 1076 goto err; 1077 1078 spin_lock(&map_lock); 1079 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1080 base = devnum + overflow_maj; 1081 set_bit(devnum, overflow_map); 1082 } else { 1083 uverbs_dev->devnum = devnum; 1084 base = devnum + IB_UVERBS_BASE_DEV; 1085 set_bit(devnum, dev_map); 1086 } 1087 spin_unlock(&map_lock); 1088 1089 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1090 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1091 1092 cdev_init(&uverbs_dev->cdev, NULL); 1093 uverbs_dev->cdev.owner = THIS_MODULE; 1094 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1095 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj); 1096 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1097 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1098 goto err_cdev; 1099 1100 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent, 1101 uverbs_dev->cdev.dev, uverbs_dev, 1102 "uverbs%d", uverbs_dev->devnum); 1103 if (IS_ERR(uverbs_dev->dev)) 1104 goto err_cdev; 1105 1106 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1107 goto err_class; 1108 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1109 goto err_class; 1110 1111 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1112 1113 return; 1114 1115 err_class: 1116 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1117 1118 err_cdev: 1119 cdev_del(&uverbs_dev->cdev); 1120 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1121 clear_bit(devnum, dev_map); 1122 else 1123 clear_bit(devnum, overflow_map); 1124 1125 err: 1126 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1127 ib_uverbs_comp_dev(uverbs_dev); 1128 wait_for_completion(&uverbs_dev->comp); 1129 kobject_put(&uverbs_dev->kobj); 1130 return; 1131 } 1132 1133 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1134 struct ib_device *ib_dev) 1135 { 1136 struct ib_uverbs_file *file; 1137 struct ib_uverbs_async_event_file *event_file; 1138 struct ib_event event; 1139 1140 /* Pending running commands to terminate */ 1141 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1142 event.event = IB_EVENT_DEVICE_FATAL; 1143 event.element.port_num = 0; 1144 event.device = ib_dev; 1145 1146 mutex_lock(&uverbs_dev->lists_mutex); 1147 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1148 struct ib_ucontext *ucontext; 1149 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1150 struct ib_uverbs_file, list); 1151 file->is_closed = 1; 1152 list_del(&file->list); 1153 kref_get(&file->ref); 1154 mutex_unlock(&uverbs_dev->lists_mutex); 1155 1156 1157 mutex_lock(&file->cleanup_mutex); 1158 ucontext = file->ucontext; 1159 file->ucontext = NULL; 1160 mutex_unlock(&file->cleanup_mutex); 1161 1162 /* At this point ib_uverbs_close cannot be running 1163 * ib_uverbs_cleanup_ucontext 1164 */ 1165 if (ucontext) { 1166 /* We must release the mutex before going ahead and 1167 * calling disassociate_ucontext. disassociate_ucontext 1168 * might end up indirectly calling uverbs_close, 1169 * for example due to freeing the resources 1170 * (e.g mmput). 1171 */ 1172 ib_uverbs_event_handler(&file->event_handler, &event); 1173 ib_dev->disassociate_ucontext(ucontext); 1174 mutex_lock(&file->cleanup_mutex); 1175 ib_uverbs_cleanup_ucontext(file, ucontext, true); 1176 mutex_unlock(&file->cleanup_mutex); 1177 } 1178 1179 mutex_lock(&uverbs_dev->lists_mutex); 1180 kref_put(&file->ref, ib_uverbs_release_file); 1181 } 1182 1183 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1184 event_file = list_first_entry(&uverbs_dev-> 1185 uverbs_events_file_list, 1186 struct ib_uverbs_async_event_file, 1187 list); 1188 spin_lock_irq(&event_file->ev_queue.lock); 1189 event_file->ev_queue.is_closed = 1; 1190 spin_unlock_irq(&event_file->ev_queue.lock); 1191 1192 list_del(&event_file->list); 1193 ib_unregister_event_handler( 1194 &event_file->uverbs_file->event_handler); 1195 event_file->uverbs_file->event_handler.device = 1196 NULL; 1197 1198 wake_up_interruptible(&event_file->ev_queue.poll_wait); 1199 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN); 1200 } 1201 mutex_unlock(&uverbs_dev->lists_mutex); 1202 } 1203 1204 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1205 { 1206 struct ib_uverbs_device *uverbs_dev = client_data; 1207 int wait_clients = 1; 1208 1209 if (!uverbs_dev) 1210 return; 1211 1212 dev_set_drvdata(uverbs_dev->dev, NULL); 1213 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1214 cdev_del(&uverbs_dev->cdev); 1215 1216 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1217 clear_bit(uverbs_dev->devnum, dev_map); 1218 else 1219 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1220 1221 if (device->disassociate_ucontext) { 1222 /* We disassociate HW resources and immediately return. 1223 * Userspace will see a EIO errno for all future access. 1224 * Upon returning, ib_device may be freed internally and is not 1225 * valid any more. 1226 * uverbs_device is still available until all clients close 1227 * their files, then the uverbs device ref count will be zero 1228 * and its resources will be freed. 1229 * Note: At this point no more files can be opened since the 1230 * cdev was deleted, however active clients can still issue 1231 * commands and close their open files. 1232 */ 1233 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1234 ib_uverbs_free_hw_resources(uverbs_dev, device); 1235 wait_clients = 0; 1236 } 1237 1238 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1239 ib_uverbs_comp_dev(uverbs_dev); 1240 if (wait_clients) 1241 wait_for_completion(&uverbs_dev->comp); 1242 kobject_put(&uverbs_dev->kobj); 1243 } 1244 1245 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1246 { 1247 if (mode) 1248 *mode = 0666; 1249 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1250 } 1251 1252 static int __init ib_uverbs_init(void) 1253 { 1254 int ret; 1255 1256 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1257 "infiniband_verbs"); 1258 if (ret) { 1259 pr_err("user_verbs: couldn't register device number\n"); 1260 goto out; 1261 } 1262 1263 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1264 if (IS_ERR(uverbs_class)) { 1265 ret = PTR_ERR(uverbs_class); 1266 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1267 goto out_chrdev; 1268 } 1269 1270 uverbs_class->devnode = uverbs_devnode; 1271 1272 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1273 if (ret) { 1274 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1275 goto out_class; 1276 } 1277 1278 ret = ib_register_client(&uverbs_client); 1279 if (ret) { 1280 pr_err("user_verbs: couldn't register client\n"); 1281 goto out_class; 1282 } 1283 1284 return 0; 1285 1286 out_class: 1287 class_destroy(uverbs_class); 1288 1289 out_chrdev: 1290 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1291 1292 out: 1293 return ret; 1294 } 1295 1296 static void __exit ib_uverbs_cleanup(void) 1297 { 1298 ib_unregister_client(&uverbs_client); 1299 class_destroy(uverbs_class); 1300 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1301 if (overflow_maj) 1302 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1303 } 1304 1305 module_init(ib_uverbs_init); 1306 module_exit(ib_uverbs_cleanup); 1307