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 kfree(file); 254 } 255 256 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, 257 struct ib_uverbs_file *uverbs_file, 258 struct file *filp, char __user *buf, 259 size_t count, loff_t *pos, 260 size_t eventsz) 261 { 262 struct ib_uverbs_event *event; 263 int ret = 0; 264 265 spin_lock_irq(&ev_queue->lock); 266 267 while (list_empty(&ev_queue->event_list)) { 268 spin_unlock_irq(&ev_queue->lock); 269 270 if (filp->f_flags & O_NONBLOCK) 271 return -EAGAIN; 272 273 if (wait_event_interruptible(ev_queue->poll_wait, 274 (!list_empty(&ev_queue->event_list) || 275 /* The barriers built into wait_event_interruptible() 276 * and wake_up() guarentee this will see the null set 277 * without using RCU 278 */ 279 !uverbs_file->device->ib_dev))) 280 return -ERESTARTSYS; 281 282 /* If device was disassociated and no event exists set an error */ 283 if (list_empty(&ev_queue->event_list) && 284 !uverbs_file->device->ib_dev) 285 return -EIO; 286 287 spin_lock_irq(&ev_queue->lock); 288 } 289 290 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); 291 292 if (eventsz > count) { 293 ret = -EINVAL; 294 event = NULL; 295 } else { 296 list_del(ev_queue->event_list.next); 297 if (event->counter) { 298 ++(*event->counter); 299 list_del(&event->obj_list); 300 } 301 } 302 303 spin_unlock_irq(&ev_queue->lock); 304 305 if (event) { 306 if (copy_to_user(buf, event, eventsz)) 307 ret = -EFAULT; 308 else 309 ret = eventsz; 310 } 311 312 kfree(event); 313 314 return ret; 315 } 316 317 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, 318 size_t count, loff_t *pos) 319 { 320 struct ib_uverbs_async_event_file *file = filp->private_data; 321 322 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, 323 buf, count, pos, 324 sizeof(struct ib_uverbs_async_event_desc)); 325 } 326 327 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, 328 size_t count, loff_t *pos) 329 { 330 struct ib_uverbs_completion_event_file *comp_ev_file = 331 filp->private_data; 332 333 return ib_uverbs_event_read(&comp_ev_file->ev_queue, 334 comp_ev_file->uobj_file.ufile, filp, 335 buf, count, pos, 336 sizeof(struct ib_uverbs_comp_event_desc)); 337 } 338 339 static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, 340 struct file *filp, 341 struct poll_table_struct *wait) 342 { 343 unsigned int pollflags = 0; 344 345 poll_wait(filp, &ev_queue->poll_wait, wait); 346 347 spin_lock_irq(&ev_queue->lock); 348 if (!list_empty(&ev_queue->event_list)) 349 pollflags = POLLIN | POLLRDNORM; 350 spin_unlock_irq(&ev_queue->lock); 351 352 return pollflags; 353 } 354 355 static unsigned int ib_uverbs_async_event_poll(struct file *filp, 356 struct poll_table_struct *wait) 357 { 358 return ib_uverbs_event_poll(filp->private_data, filp, wait); 359 } 360 361 static unsigned int ib_uverbs_comp_event_poll(struct file *filp, 362 struct poll_table_struct *wait) 363 { 364 struct ib_uverbs_completion_event_file *comp_ev_file = 365 filp->private_data; 366 367 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); 368 } 369 370 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) 371 { 372 struct ib_uverbs_event_queue *ev_queue = filp->private_data; 373 374 return fasync_helper(fd, filp, on, &ev_queue->async_queue); 375 } 376 377 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) 378 { 379 struct ib_uverbs_completion_event_file *comp_ev_file = 380 filp->private_data; 381 382 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); 383 } 384 385 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) 386 { 387 struct ib_uverbs_async_event_file *file = filp->private_data; 388 struct ib_uverbs_file *uverbs_file = file->uverbs_file; 389 struct ib_uverbs_event *entry, *tmp; 390 int closed_already = 0; 391 392 mutex_lock(&uverbs_file->device->lists_mutex); 393 spin_lock_irq(&file->ev_queue.lock); 394 closed_already = file->ev_queue.is_closed; 395 file->ev_queue.is_closed = 1; 396 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 397 if (entry->counter) 398 list_del(&entry->obj_list); 399 kfree(entry); 400 } 401 spin_unlock_irq(&file->ev_queue.lock); 402 if (!closed_already) { 403 list_del(&file->list); 404 ib_unregister_event_handler(&uverbs_file->event_handler); 405 } 406 mutex_unlock(&uverbs_file->device->lists_mutex); 407 408 kref_put(&uverbs_file->ref, ib_uverbs_release_file); 409 kref_put(&file->ref, ib_uverbs_release_async_event_file); 410 411 return 0; 412 } 413 414 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) 415 { 416 struct ib_uverbs_completion_event_file *file = filp->private_data; 417 struct ib_uverbs_event *entry, *tmp; 418 419 spin_lock_irq(&file->ev_queue.lock); 420 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 421 if (entry->counter) 422 list_del(&entry->obj_list); 423 kfree(entry); 424 } 425 spin_unlock_irq(&file->ev_queue.lock); 426 427 uverbs_close_fd(filp); 428 429 return 0; 430 } 431 432 const struct file_operations uverbs_event_fops = { 433 .owner = THIS_MODULE, 434 .read = ib_uverbs_comp_event_read, 435 .poll = ib_uverbs_comp_event_poll, 436 .release = ib_uverbs_comp_event_close, 437 .fasync = ib_uverbs_comp_event_fasync, 438 .llseek = no_llseek, 439 }; 440 441 static const struct file_operations uverbs_async_event_fops = { 442 .owner = THIS_MODULE, 443 .read = ib_uverbs_async_event_read, 444 .poll = ib_uverbs_async_event_poll, 445 .release = ib_uverbs_async_event_close, 446 .fasync = ib_uverbs_async_event_fasync, 447 .llseek = no_llseek, 448 }; 449 450 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 451 { 452 struct ib_uverbs_event_queue *ev_queue = cq_context; 453 struct ib_ucq_object *uobj; 454 struct ib_uverbs_event *entry; 455 unsigned long flags; 456 457 if (!ev_queue) 458 return; 459 460 spin_lock_irqsave(&ev_queue->lock, flags); 461 if (ev_queue->is_closed) { 462 spin_unlock_irqrestore(&ev_queue->lock, flags); 463 return; 464 } 465 466 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 467 if (!entry) { 468 spin_unlock_irqrestore(&ev_queue->lock, flags); 469 return; 470 } 471 472 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 473 474 entry->desc.comp.cq_handle = cq->uobject->user_handle; 475 entry->counter = &uobj->comp_events_reported; 476 477 list_add_tail(&entry->list, &ev_queue->event_list); 478 list_add_tail(&entry->obj_list, &uobj->comp_list); 479 spin_unlock_irqrestore(&ev_queue->lock, flags); 480 481 wake_up_interruptible(&ev_queue->poll_wait); 482 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); 483 } 484 485 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 486 __u64 element, __u64 event, 487 struct list_head *obj_list, 488 u32 *counter) 489 { 490 struct ib_uverbs_event *entry; 491 unsigned long flags; 492 493 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags); 494 if (file->async_file->ev_queue.is_closed) { 495 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 496 return; 497 } 498 499 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 500 if (!entry) { 501 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 502 return; 503 } 504 505 entry->desc.async.element = element; 506 entry->desc.async.event_type = event; 507 entry->desc.async.reserved = 0; 508 entry->counter = counter; 509 510 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list); 511 if (obj_list) 512 list_add_tail(&entry->obj_list, obj_list); 513 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 514 515 wake_up_interruptible(&file->async_file->ev_queue.poll_wait); 516 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN); 517 } 518 519 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 520 { 521 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 522 struct ib_ucq_object, uobject); 523 524 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 525 event->event, &uobj->async_list, 526 &uobj->async_events_reported); 527 } 528 529 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 530 { 531 struct ib_uevent_object *uobj; 532 533 /* for XRC target qp's, check that qp is live */ 534 if (!event->element.qp->uobject) 535 return; 536 537 uobj = container_of(event->element.qp->uobject, 538 struct ib_uevent_object, uobject); 539 540 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 541 event->event, &uobj->event_list, 542 &uobj->events_reported); 543 } 544 545 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 546 { 547 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 548 struct ib_uevent_object, uobject); 549 550 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 551 event->event, &uobj->event_list, 552 &uobj->events_reported); 553 } 554 555 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 556 { 557 struct ib_uevent_object *uobj; 558 559 uobj = container_of(event->element.srq->uobject, 560 struct ib_uevent_object, uobject); 561 562 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 563 event->event, &uobj->event_list, 564 &uobj->events_reported); 565 } 566 567 void ib_uverbs_event_handler(struct ib_event_handler *handler, 568 struct ib_event *event) 569 { 570 struct ib_uverbs_file *file = 571 container_of(handler, struct ib_uverbs_file, event_handler); 572 573 ib_uverbs_async_handler(file, event->element.port_num, event->event, 574 NULL, NULL); 575 } 576 577 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 578 { 579 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file); 580 file->async_file = NULL; 581 } 582 583 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) 584 { 585 spin_lock_init(&ev_queue->lock); 586 INIT_LIST_HEAD(&ev_queue->event_list); 587 init_waitqueue_head(&ev_queue->poll_wait); 588 ev_queue->is_closed = 0; 589 ev_queue->async_queue = NULL; 590 } 591 592 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, 593 struct ib_device *ib_dev) 594 { 595 struct ib_uverbs_async_event_file *ev_file; 596 struct file *filp; 597 int ret; 598 599 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 600 if (!ev_file) 601 return ERR_PTR(-ENOMEM); 602 603 ib_uverbs_init_event_queue(&ev_file->ev_queue); 604 ev_file->uverbs_file = uverbs_file; 605 kref_get(&ev_file->uverbs_file->ref); 606 kref_init(&ev_file->ref); 607 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_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 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 */ 628 629 return filp; 630 631 err_put_file: 632 fput(filp); 633 kref_put(&uverbs_file->async_file->ref, 634 ib_uverbs_release_async_event_file); 635 uverbs_file->async_file = NULL; 636 return ERR_PTR(ret); 637 638 err_put_refs: 639 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 640 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file); 641 return filp; 642 } 643 644 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 645 { 646 u64 mask; 647 648 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 649 mask = ib_dev->uverbs_cmd_mask; 650 else 651 mask = ib_dev->uverbs_ex_cmd_mask; 652 653 if (mask & ((u64)1 << command)) 654 return 0; 655 656 return -1; 657 } 658 659 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 660 size_t count, loff_t *pos) 661 { 662 struct ib_uverbs_file *file = filp->private_data; 663 struct ib_device *ib_dev; 664 struct ib_uverbs_cmd_hdr hdr; 665 __u32 command; 666 __u32 flags; 667 int srcu_key; 668 ssize_t ret; 669 670 if (!ib_safe_file_access(filp)) { 671 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", 672 task_tgid_vnr(current), current->comm); 673 return -EACCES; 674 } 675 676 if (count < sizeof hdr) 677 return -EINVAL; 678 679 if (copy_from_user(&hdr, buf, sizeof hdr)) 680 return -EFAULT; 681 682 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 683 ib_dev = srcu_dereference(file->device->ib_dev, 684 &file->device->disassociate_srcu); 685 if (!ib_dev) { 686 ret = -EIO; 687 goto out; 688 } 689 690 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 691 IB_USER_VERBS_CMD_COMMAND_MASK)) { 692 ret = -EINVAL; 693 goto out; 694 } 695 696 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 697 if (verify_command_mask(ib_dev, command)) { 698 ret = -EOPNOTSUPP; 699 goto out; 700 } 701 702 if (!file->ucontext && 703 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 704 ret = -EINVAL; 705 goto out; 706 } 707 708 flags = (hdr.command & 709 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 710 711 if (!flags) { 712 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 713 !uverbs_cmd_table[command]) { 714 ret = -EINVAL; 715 goto out; 716 } 717 718 if (hdr.in_words * 4 != count) { 719 ret = -EINVAL; 720 goto out; 721 } 722 723 ret = uverbs_cmd_table[command](file, ib_dev, 724 buf + sizeof(hdr), 725 hdr.in_words * 4, 726 hdr.out_words * 4); 727 728 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 729 struct ib_uverbs_ex_cmd_hdr ex_hdr; 730 struct ib_udata ucore; 731 struct ib_udata uhw; 732 size_t written_count = count; 733 734 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 735 !uverbs_ex_cmd_table[command]) { 736 ret = -ENOSYS; 737 goto out; 738 } 739 740 if (!file->ucontext) { 741 ret = -EINVAL; 742 goto out; 743 } 744 745 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 746 ret = -EINVAL; 747 goto out; 748 } 749 750 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 751 ret = -EFAULT; 752 goto out; 753 } 754 755 count -= sizeof(hdr) + sizeof(ex_hdr); 756 buf += sizeof(hdr) + sizeof(ex_hdr); 757 758 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 759 ret = -EINVAL; 760 goto out; 761 } 762 763 if (ex_hdr.cmd_hdr_reserved) { 764 ret = -EINVAL; 765 goto out; 766 } 767 768 if (ex_hdr.response) { 769 if (!hdr.out_words && !ex_hdr.provider_out_words) { 770 ret = -EINVAL; 771 goto out; 772 } 773 774 if (!access_ok(VERIFY_WRITE, 775 (void __user *) (unsigned long) ex_hdr.response, 776 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 777 ret = -EFAULT; 778 goto out; 779 } 780 } else { 781 if (hdr.out_words || ex_hdr.provider_out_words) { 782 ret = -EINVAL; 783 goto out; 784 } 785 } 786 787 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, 788 hdr.in_words * 8, hdr.out_words * 8); 789 790 INIT_UDATA_BUF_OR_NULL(&uhw, 791 buf + ucore.inlen, 792 (unsigned long) ex_hdr.response + ucore.outlen, 793 ex_hdr.provider_in_words * 8, 794 ex_hdr.provider_out_words * 8); 795 796 ret = uverbs_ex_cmd_table[command](file, 797 ib_dev, 798 &ucore, 799 &uhw); 800 if (!ret) 801 ret = written_count; 802 } else { 803 ret = -ENOSYS; 804 } 805 806 out: 807 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 808 return ret; 809 } 810 811 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 812 { 813 struct ib_uverbs_file *file = filp->private_data; 814 struct ib_device *ib_dev; 815 int ret = 0; 816 int srcu_key; 817 818 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 819 ib_dev = srcu_dereference(file->device->ib_dev, 820 &file->device->disassociate_srcu); 821 if (!ib_dev) { 822 ret = -EIO; 823 goto out; 824 } 825 826 if (!file->ucontext) 827 ret = -ENODEV; 828 else 829 ret = ib_dev->mmap(file->ucontext, vma); 830 out: 831 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 832 return ret; 833 } 834 835 /* 836 * ib_uverbs_open() does not need the BKL: 837 * 838 * - the ib_uverbs_device structures are properly reference counted and 839 * everything else is purely local to the file being created, so 840 * races against other open calls are not a problem; 841 * - there is no ioctl method to race against; 842 * - the open method will either immediately run -ENXIO, or all 843 * required initialization will be done. 844 */ 845 static int ib_uverbs_open(struct inode *inode, struct file *filp) 846 { 847 struct ib_uverbs_device *dev; 848 struct ib_uverbs_file *file; 849 struct ib_device *ib_dev; 850 int ret; 851 int module_dependent; 852 int srcu_key; 853 854 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 855 if (!atomic_inc_not_zero(&dev->refcount)) 856 return -ENXIO; 857 858 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 859 mutex_lock(&dev->lists_mutex); 860 ib_dev = srcu_dereference(dev->ib_dev, 861 &dev->disassociate_srcu); 862 if (!ib_dev) { 863 ret = -EIO; 864 goto err; 865 } 866 867 /* In case IB device supports disassociate ucontext, there is no hard 868 * dependency between uverbs device and its low level device. 869 */ 870 module_dependent = !(ib_dev->disassociate_ucontext); 871 872 if (module_dependent) { 873 if (!try_module_get(ib_dev->owner)) { 874 ret = -ENODEV; 875 goto err; 876 } 877 } 878 879 file = kzalloc(sizeof(*file), GFP_KERNEL); 880 if (!file) { 881 ret = -ENOMEM; 882 if (module_dependent) 883 goto err_module; 884 885 goto err; 886 } 887 888 file->device = dev; 889 spin_lock_init(&file->idr_lock); 890 idr_init(&file->idr); 891 file->ucontext = NULL; 892 file->async_file = NULL; 893 kref_init(&file->ref); 894 mutex_init(&file->mutex); 895 mutex_init(&file->cleanup_mutex); 896 897 filp->private_data = file; 898 kobject_get(&dev->kobj); 899 list_add_tail(&file->list, &dev->uverbs_file_list); 900 mutex_unlock(&dev->lists_mutex); 901 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 902 903 return nonseekable_open(inode, filp); 904 905 err_module: 906 module_put(ib_dev->owner); 907 908 err: 909 mutex_unlock(&dev->lists_mutex); 910 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 911 if (atomic_dec_and_test(&dev->refcount)) 912 ib_uverbs_comp_dev(dev); 913 914 return ret; 915 } 916 917 static int ib_uverbs_close(struct inode *inode, struct file *filp) 918 { 919 struct ib_uverbs_file *file = filp->private_data; 920 struct ib_uverbs_device *dev = file->device; 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 kobject_put(&dev->kobj); 943 944 return 0; 945 } 946 947 static const struct file_operations uverbs_fops = { 948 .owner = THIS_MODULE, 949 .write = ib_uverbs_write, 950 .open = ib_uverbs_open, 951 .release = ib_uverbs_close, 952 .llseek = no_llseek, 953 }; 954 955 static const struct file_operations uverbs_mmap_fops = { 956 .owner = THIS_MODULE, 957 .write = ib_uverbs_write, 958 .mmap = ib_uverbs_mmap, 959 .open = ib_uverbs_open, 960 .release = ib_uverbs_close, 961 .llseek = no_llseek, 962 }; 963 964 static struct ib_client uverbs_client = { 965 .name = "uverbs", 966 .add = ib_uverbs_add_one, 967 .remove = ib_uverbs_remove_one 968 }; 969 970 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 971 char *buf) 972 { 973 int ret = -ENODEV; 974 int srcu_key; 975 struct ib_uverbs_device *dev = dev_get_drvdata(device); 976 struct ib_device *ib_dev; 977 978 if (!dev) 979 return -ENODEV; 980 981 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 982 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 983 if (ib_dev) 984 ret = sprintf(buf, "%s\n", ib_dev->name); 985 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 986 987 return ret; 988 } 989 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 990 991 static ssize_t show_dev_abi_version(struct device *device, 992 struct device_attribute *attr, char *buf) 993 { 994 struct ib_uverbs_device *dev = dev_get_drvdata(device); 995 int ret = -ENODEV; 996 int srcu_key; 997 struct ib_device *ib_dev; 998 999 if (!dev) 1000 return -ENODEV; 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, "%d\n", ib_dev->uverbs_abi_ver); 1005 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1006 1007 return ret; 1008 } 1009 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1010 1011 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1012 __stringify(IB_USER_VERBS_ABI_VERSION)); 1013 1014 static dev_t overflow_maj; 1015 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1016 1017 /* 1018 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1019 * requesting a new major number and doubling the number of max devices we 1020 * support. It's stupid, but simple. 1021 */ 1022 static int find_overflow_devnum(void) 1023 { 1024 int ret; 1025 1026 if (!overflow_maj) { 1027 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1028 "infiniband_verbs"); 1029 if (ret) { 1030 pr_err("user_verbs: couldn't register dynamic device number\n"); 1031 return ret; 1032 } 1033 } 1034 1035 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1036 if (ret >= IB_UVERBS_MAX_DEVICES) 1037 return -1; 1038 1039 return ret; 1040 } 1041 1042 static void ib_uverbs_add_one(struct ib_device *device) 1043 { 1044 int devnum; 1045 dev_t base; 1046 struct ib_uverbs_device *uverbs_dev; 1047 int ret; 1048 1049 if (!device->alloc_ucontext) 1050 return; 1051 1052 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1053 if (!uverbs_dev) 1054 return; 1055 1056 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1057 if (ret) { 1058 kfree(uverbs_dev); 1059 return; 1060 } 1061 1062 atomic_set(&uverbs_dev->refcount, 1); 1063 init_completion(&uverbs_dev->comp); 1064 uverbs_dev->xrcd_tree = RB_ROOT; 1065 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1066 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1067 mutex_init(&uverbs_dev->lists_mutex); 1068 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1069 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1070 1071 spin_lock(&map_lock); 1072 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1073 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1074 spin_unlock(&map_lock); 1075 devnum = find_overflow_devnum(); 1076 if (devnum < 0) 1077 goto err; 1078 1079 spin_lock(&map_lock); 1080 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1081 base = devnum + overflow_maj; 1082 set_bit(devnum, overflow_map); 1083 } else { 1084 uverbs_dev->devnum = devnum; 1085 base = devnum + IB_UVERBS_BASE_DEV; 1086 set_bit(devnum, dev_map); 1087 } 1088 spin_unlock(&map_lock); 1089 1090 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1091 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1092 1093 cdev_init(&uverbs_dev->cdev, NULL); 1094 uverbs_dev->cdev.owner = THIS_MODULE; 1095 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1096 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj); 1097 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1098 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1099 goto err_cdev; 1100 1101 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent, 1102 uverbs_dev->cdev.dev, uverbs_dev, 1103 "uverbs%d", uverbs_dev->devnum); 1104 if (IS_ERR(uverbs_dev->dev)) 1105 goto err_cdev; 1106 1107 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1108 goto err_class; 1109 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1110 goto err_class; 1111 1112 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1113 1114 return; 1115 1116 err_class: 1117 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1118 1119 err_cdev: 1120 cdev_del(&uverbs_dev->cdev); 1121 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1122 clear_bit(devnum, dev_map); 1123 else 1124 clear_bit(devnum, overflow_map); 1125 1126 err: 1127 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1128 ib_uverbs_comp_dev(uverbs_dev); 1129 wait_for_completion(&uverbs_dev->comp); 1130 kobject_put(&uverbs_dev->kobj); 1131 return; 1132 } 1133 1134 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1135 struct ib_device *ib_dev) 1136 { 1137 struct ib_uverbs_file *file; 1138 struct ib_uverbs_async_event_file *event_file; 1139 struct ib_event event; 1140 1141 /* Pending running commands to terminate */ 1142 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1143 event.event = IB_EVENT_DEVICE_FATAL; 1144 event.element.port_num = 0; 1145 event.device = ib_dev; 1146 1147 mutex_lock(&uverbs_dev->lists_mutex); 1148 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1149 struct ib_ucontext *ucontext; 1150 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1151 struct ib_uverbs_file, list); 1152 file->is_closed = 1; 1153 list_del(&file->list); 1154 kref_get(&file->ref); 1155 mutex_unlock(&uverbs_dev->lists_mutex); 1156 1157 ib_uverbs_event_handler(&file->event_handler, &event); 1158 1159 mutex_lock(&file->cleanup_mutex); 1160 ucontext = file->ucontext; 1161 file->ucontext = NULL; 1162 mutex_unlock(&file->cleanup_mutex); 1163 1164 /* At this point ib_uverbs_close cannot be running 1165 * ib_uverbs_cleanup_ucontext 1166 */ 1167 if (ucontext) { 1168 /* We must release the mutex before going ahead and 1169 * calling disassociate_ucontext. disassociate_ucontext 1170 * might end up indirectly calling uverbs_close, 1171 * for example due to freeing the resources 1172 * (e.g mmput). 1173 */ 1174 ib_dev->disassociate_ucontext(ucontext); 1175 mutex_lock(&file->cleanup_mutex); 1176 ib_uverbs_cleanup_ucontext(file, ucontext, true); 1177 mutex_unlock(&file->cleanup_mutex); 1178 } 1179 1180 mutex_lock(&uverbs_dev->lists_mutex); 1181 kref_put(&file->ref, ib_uverbs_release_file); 1182 } 1183 1184 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1185 event_file = list_first_entry(&uverbs_dev-> 1186 uverbs_events_file_list, 1187 struct ib_uverbs_async_event_file, 1188 list); 1189 spin_lock_irq(&event_file->ev_queue.lock); 1190 event_file->ev_queue.is_closed = 1; 1191 spin_unlock_irq(&event_file->ev_queue.lock); 1192 1193 list_del(&event_file->list); 1194 ib_unregister_event_handler( 1195 &event_file->uverbs_file->event_handler); 1196 event_file->uverbs_file->event_handler.device = 1197 NULL; 1198 1199 wake_up_interruptible(&event_file->ev_queue.poll_wait); 1200 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN); 1201 } 1202 mutex_unlock(&uverbs_dev->lists_mutex); 1203 } 1204 1205 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1206 { 1207 struct ib_uverbs_device *uverbs_dev = client_data; 1208 int wait_clients = 1; 1209 1210 if (!uverbs_dev) 1211 return; 1212 1213 dev_set_drvdata(uverbs_dev->dev, NULL); 1214 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1215 cdev_del(&uverbs_dev->cdev); 1216 1217 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1218 clear_bit(uverbs_dev->devnum, dev_map); 1219 else 1220 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1221 1222 if (device->disassociate_ucontext) { 1223 /* We disassociate HW resources and immediately return. 1224 * Userspace will see a EIO errno for all future access. 1225 * Upon returning, ib_device may be freed internally and is not 1226 * valid any more. 1227 * uverbs_device is still available until all clients close 1228 * their files, then the uverbs device ref count will be zero 1229 * and its resources will be freed. 1230 * Note: At this point no more files can be opened since the 1231 * cdev was deleted, however active clients can still issue 1232 * commands and close their open files. 1233 */ 1234 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1235 ib_uverbs_free_hw_resources(uverbs_dev, device); 1236 wait_clients = 0; 1237 } 1238 1239 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1240 ib_uverbs_comp_dev(uverbs_dev); 1241 if (wait_clients) 1242 wait_for_completion(&uverbs_dev->comp); 1243 kobject_put(&uverbs_dev->kobj); 1244 } 1245 1246 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1247 { 1248 if (mode) 1249 *mode = 0666; 1250 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1251 } 1252 1253 static int __init ib_uverbs_init(void) 1254 { 1255 int ret; 1256 1257 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1258 "infiniband_verbs"); 1259 if (ret) { 1260 pr_err("user_verbs: couldn't register device number\n"); 1261 goto out; 1262 } 1263 1264 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1265 if (IS_ERR(uverbs_class)) { 1266 ret = PTR_ERR(uverbs_class); 1267 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1268 goto out_chrdev; 1269 } 1270 1271 uverbs_class->devnode = uverbs_devnode; 1272 1273 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1274 if (ret) { 1275 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1276 goto out_class; 1277 } 1278 1279 ret = ib_register_client(&uverbs_client); 1280 if (ret) { 1281 pr_err("user_verbs: couldn't register client\n"); 1282 goto out_class; 1283 } 1284 1285 return 0; 1286 1287 out_class: 1288 class_destroy(uverbs_class); 1289 1290 out_chrdev: 1291 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1292 1293 out: 1294 return ret; 1295 } 1296 1297 static void __exit ib_uverbs_cleanup(void) 1298 { 1299 ib_unregister_client(&uverbs_client); 1300 class_destroy(uverbs_class); 1301 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1302 if (overflow_maj) 1303 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1304 } 1305 1306 module_init(ib_uverbs_init); 1307 module_exit(ib_uverbs_cleanup); 1308