1 /* 2 * Copyright (c) 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 6 * Copyright (c) 2005 PathScale, Inc. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 */ 36 37 #include <linux/module.h> 38 #include <linux/init.h> 39 #include <linux/device.h> 40 #include <linux/err.h> 41 #include <linux/fs.h> 42 #include <linux/poll.h> 43 #include <linux/sched.h> 44 #include <linux/file.h> 45 #include <linux/cdev.h> 46 #include <linux/anon_inodes.h> 47 #include <linux/slab.h> 48 49 #include <linux/uaccess.h> 50 51 #include <rdma/ib.h> 52 #include <rdma/uverbs_std_types.h> 53 54 #include "uverbs.h" 55 #include "core_priv.h" 56 #include "rdma_core.h" 57 58 MODULE_AUTHOR("Roland Dreier"); 59 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 60 MODULE_LICENSE("Dual BSD/GPL"); 61 62 enum { 63 IB_UVERBS_MAJOR = 231, 64 IB_UVERBS_BASE_MINOR = 192, 65 IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS, 66 IB_UVERBS_NUM_FIXED_MINOR = 32, 67 IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR, 68 }; 69 70 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 71 72 static dev_t dynamic_uverbs_dev; 73 static struct class *uverbs_class; 74 75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 76 77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 78 struct ib_device *ib_dev, 79 const char __user *buf, int in_len, 80 int out_len) = { 81 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 82 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 83 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 84 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 85 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 86 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 87 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 88 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 89 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 90 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 91 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 92 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 93 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 94 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 95 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 96 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 97 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 98 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 99 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 100 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 101 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 102 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 103 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 104 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 105 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 106 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 107 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 108 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 109 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 110 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 111 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 112 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 113 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 114 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 115 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 116 }; 117 118 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 119 struct ib_device *ib_dev, 120 struct ib_udata *ucore, 121 struct ib_udata *uhw) = { 122 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 123 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 124 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 125 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 126 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 127 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, 128 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, 129 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, 130 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, 131 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, 132 [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp, 133 [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq, 134 }; 135 136 static void ib_uverbs_add_one(struct ib_device *device); 137 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 138 139 int uverbs_dealloc_mw(struct ib_mw *mw) 140 { 141 struct ib_pd *pd = mw->pd; 142 int ret; 143 144 ret = mw->device->dealloc_mw(mw); 145 if (!ret) 146 atomic_dec(&pd->usecnt); 147 return ret; 148 } 149 150 static void ib_uverbs_release_dev(struct kobject *kobj) 151 { 152 struct ib_uverbs_device *dev = 153 container_of(kobj, struct ib_uverbs_device, kobj); 154 155 cleanup_srcu_struct(&dev->disassociate_srcu); 156 kfree(dev); 157 } 158 159 static struct kobj_type ib_uverbs_dev_ktype = { 160 .release = ib_uverbs_release_dev, 161 }; 162 163 static void ib_uverbs_release_async_event_file(struct kref *ref) 164 { 165 struct ib_uverbs_async_event_file *file = 166 container_of(ref, struct ib_uverbs_async_event_file, ref); 167 168 kfree(file); 169 } 170 171 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 172 struct ib_uverbs_completion_event_file *ev_file, 173 struct ib_ucq_object *uobj) 174 { 175 struct ib_uverbs_event *evt, *tmp; 176 177 if (ev_file) { 178 spin_lock_irq(&ev_file->ev_queue.lock); 179 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 180 list_del(&evt->list); 181 kfree(evt); 182 } 183 spin_unlock_irq(&ev_file->ev_queue.lock); 184 185 uverbs_uobject_put(&ev_file->uobj_file.uobj); 186 } 187 188 spin_lock_irq(&file->async_file->ev_queue.lock); 189 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 190 list_del(&evt->list); 191 kfree(evt); 192 } 193 spin_unlock_irq(&file->async_file->ev_queue.lock); 194 } 195 196 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 197 struct ib_uevent_object *uobj) 198 { 199 struct ib_uverbs_event *evt, *tmp; 200 201 spin_lock_irq(&file->async_file->ev_queue.lock); 202 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 203 list_del(&evt->list); 204 kfree(evt); 205 } 206 spin_unlock_irq(&file->async_file->ev_queue.lock); 207 } 208 209 void ib_uverbs_detach_umcast(struct ib_qp *qp, 210 struct ib_uqp_object *uobj) 211 { 212 struct ib_uverbs_mcast_entry *mcast, *tmp; 213 214 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 215 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 216 list_del(&mcast->list); 217 kfree(mcast); 218 } 219 } 220 221 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 222 struct ib_ucontext *context, 223 bool device_removed) 224 { 225 context->closing = 1; 226 uverbs_cleanup_ucontext(context, device_removed); 227 put_pid(context->tgid); 228 229 ib_rdmacg_uncharge(&context->cg_obj, context->device, 230 RDMACG_RESOURCE_HCA_HANDLE); 231 232 return context->device->dealloc_ucontext(context); 233 } 234 235 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 236 { 237 complete(&dev->comp); 238 } 239 240 void ib_uverbs_release_file(struct kref *ref) 241 { 242 struct ib_uverbs_file *file = 243 container_of(ref, struct ib_uverbs_file, ref); 244 struct ib_device *ib_dev; 245 int srcu_key; 246 247 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 248 ib_dev = srcu_dereference(file->device->ib_dev, 249 &file->device->disassociate_srcu); 250 if (ib_dev && !ib_dev->disassociate_ucontext) 251 module_put(ib_dev->owner); 252 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 253 254 if (atomic_dec_and_test(&file->device->refcount)) 255 ib_uverbs_comp_dev(file->device); 256 257 kobject_put(&file->device->kobj); 258 kfree(file); 259 } 260 261 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, 262 struct ib_uverbs_file *uverbs_file, 263 struct file *filp, char __user *buf, 264 size_t count, loff_t *pos, 265 size_t eventsz) 266 { 267 struct ib_uverbs_event *event; 268 int ret = 0; 269 270 spin_lock_irq(&ev_queue->lock); 271 272 while (list_empty(&ev_queue->event_list)) { 273 spin_unlock_irq(&ev_queue->lock); 274 275 if (filp->f_flags & O_NONBLOCK) 276 return -EAGAIN; 277 278 if (wait_event_interruptible(ev_queue->poll_wait, 279 (!list_empty(&ev_queue->event_list) || 280 /* The barriers built into wait_event_interruptible() 281 * and wake_up() guarentee this will see the null set 282 * without using RCU 283 */ 284 !uverbs_file->device->ib_dev))) 285 return -ERESTARTSYS; 286 287 /* If device was disassociated and no event exists set an error */ 288 if (list_empty(&ev_queue->event_list) && 289 !uverbs_file->device->ib_dev) 290 return -EIO; 291 292 spin_lock_irq(&ev_queue->lock); 293 } 294 295 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); 296 297 if (eventsz > count) { 298 ret = -EINVAL; 299 event = NULL; 300 } else { 301 list_del(ev_queue->event_list.next); 302 if (event->counter) { 303 ++(*event->counter); 304 list_del(&event->obj_list); 305 } 306 } 307 308 spin_unlock_irq(&ev_queue->lock); 309 310 if (event) { 311 if (copy_to_user(buf, event, eventsz)) 312 ret = -EFAULT; 313 else 314 ret = eventsz; 315 } 316 317 kfree(event); 318 319 return ret; 320 } 321 322 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, 323 size_t count, loff_t *pos) 324 { 325 struct ib_uverbs_async_event_file *file = filp->private_data; 326 327 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, 328 buf, count, pos, 329 sizeof(struct ib_uverbs_async_event_desc)); 330 } 331 332 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, 333 size_t count, loff_t *pos) 334 { 335 struct ib_uverbs_completion_event_file *comp_ev_file = 336 filp->private_data; 337 338 return ib_uverbs_event_read(&comp_ev_file->ev_queue, 339 comp_ev_file->uobj_file.ufile, filp, 340 buf, count, pos, 341 sizeof(struct ib_uverbs_comp_event_desc)); 342 } 343 344 static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, 345 struct file *filp, 346 struct poll_table_struct *wait) 347 { 348 __poll_t pollflags = 0; 349 350 poll_wait(filp, &ev_queue->poll_wait, wait); 351 352 spin_lock_irq(&ev_queue->lock); 353 if (!list_empty(&ev_queue->event_list)) 354 pollflags = EPOLLIN | EPOLLRDNORM; 355 spin_unlock_irq(&ev_queue->lock); 356 357 return pollflags; 358 } 359 360 static __poll_t ib_uverbs_async_event_poll(struct file *filp, 361 struct poll_table_struct *wait) 362 { 363 return ib_uverbs_event_poll(filp->private_data, filp, wait); 364 } 365 366 static __poll_t ib_uverbs_comp_event_poll(struct file *filp, 367 struct poll_table_struct *wait) 368 { 369 struct ib_uverbs_completion_event_file *comp_ev_file = 370 filp->private_data; 371 372 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); 373 } 374 375 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) 376 { 377 struct ib_uverbs_event_queue *ev_queue = filp->private_data; 378 379 return fasync_helper(fd, filp, on, &ev_queue->async_queue); 380 } 381 382 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) 383 { 384 struct ib_uverbs_completion_event_file *comp_ev_file = 385 filp->private_data; 386 387 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); 388 } 389 390 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) 391 { 392 struct ib_uverbs_async_event_file *file = filp->private_data; 393 struct ib_uverbs_file *uverbs_file = file->uverbs_file; 394 struct ib_uverbs_event *entry, *tmp; 395 int closed_already = 0; 396 397 mutex_lock(&uverbs_file->device->lists_mutex); 398 spin_lock_irq(&file->ev_queue.lock); 399 closed_already = file->ev_queue.is_closed; 400 file->ev_queue.is_closed = 1; 401 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 402 if (entry->counter) 403 list_del(&entry->obj_list); 404 kfree(entry); 405 } 406 spin_unlock_irq(&file->ev_queue.lock); 407 if (!closed_already) { 408 list_del(&file->list); 409 ib_unregister_event_handler(&uverbs_file->event_handler); 410 } 411 mutex_unlock(&uverbs_file->device->lists_mutex); 412 413 kref_put(&uverbs_file->ref, ib_uverbs_release_file); 414 kref_put(&file->ref, ib_uverbs_release_async_event_file); 415 416 return 0; 417 } 418 419 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) 420 { 421 struct ib_uverbs_completion_event_file *file = filp->private_data; 422 struct ib_uverbs_event *entry, *tmp; 423 424 spin_lock_irq(&file->ev_queue.lock); 425 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 426 if (entry->counter) 427 list_del(&entry->obj_list); 428 kfree(entry); 429 } 430 spin_unlock_irq(&file->ev_queue.lock); 431 432 uverbs_close_fd(filp); 433 434 return 0; 435 } 436 437 const struct file_operations uverbs_event_fops = { 438 .owner = THIS_MODULE, 439 .read = ib_uverbs_comp_event_read, 440 .poll = ib_uverbs_comp_event_poll, 441 .release = ib_uverbs_comp_event_close, 442 .fasync = ib_uverbs_comp_event_fasync, 443 .llseek = no_llseek, 444 }; 445 446 static const struct file_operations uverbs_async_event_fops = { 447 .owner = THIS_MODULE, 448 .read = ib_uverbs_async_event_read, 449 .poll = ib_uverbs_async_event_poll, 450 .release = ib_uverbs_async_event_close, 451 .fasync = ib_uverbs_async_event_fasync, 452 .llseek = no_llseek, 453 }; 454 455 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 456 { 457 struct ib_uverbs_event_queue *ev_queue = cq_context; 458 struct ib_ucq_object *uobj; 459 struct ib_uverbs_event *entry; 460 unsigned long flags; 461 462 if (!ev_queue) 463 return; 464 465 spin_lock_irqsave(&ev_queue->lock, flags); 466 if (ev_queue->is_closed) { 467 spin_unlock_irqrestore(&ev_queue->lock, flags); 468 return; 469 } 470 471 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 472 if (!entry) { 473 spin_unlock_irqrestore(&ev_queue->lock, flags); 474 return; 475 } 476 477 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 478 479 entry->desc.comp.cq_handle = cq->uobject->user_handle; 480 entry->counter = &uobj->comp_events_reported; 481 482 list_add_tail(&entry->list, &ev_queue->event_list); 483 list_add_tail(&entry->obj_list, &uobj->comp_list); 484 spin_unlock_irqrestore(&ev_queue->lock, flags); 485 486 wake_up_interruptible(&ev_queue->poll_wait); 487 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); 488 } 489 490 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 491 __u64 element, __u64 event, 492 struct list_head *obj_list, 493 u32 *counter) 494 { 495 struct ib_uverbs_event *entry; 496 unsigned long flags; 497 498 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags); 499 if (file->async_file->ev_queue.is_closed) { 500 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 501 return; 502 } 503 504 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 505 if (!entry) { 506 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 507 return; 508 } 509 510 entry->desc.async.element = element; 511 entry->desc.async.event_type = event; 512 entry->desc.async.reserved = 0; 513 entry->counter = counter; 514 515 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list); 516 if (obj_list) 517 list_add_tail(&entry->obj_list, obj_list); 518 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 519 520 wake_up_interruptible(&file->async_file->ev_queue.poll_wait); 521 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN); 522 } 523 524 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 525 { 526 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 527 struct ib_ucq_object, uobject); 528 529 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 530 event->event, &uobj->async_list, 531 &uobj->async_events_reported); 532 } 533 534 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 535 { 536 struct ib_uevent_object *uobj; 537 538 /* for XRC target qp's, check that qp is live */ 539 if (!event->element.qp->uobject) 540 return; 541 542 uobj = container_of(event->element.qp->uobject, 543 struct ib_uevent_object, uobject); 544 545 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 546 event->event, &uobj->event_list, 547 &uobj->events_reported); 548 } 549 550 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 551 { 552 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 553 struct ib_uevent_object, uobject); 554 555 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 556 event->event, &uobj->event_list, 557 &uobj->events_reported); 558 } 559 560 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 561 { 562 struct ib_uevent_object *uobj; 563 564 uobj = container_of(event->element.srq->uobject, 565 struct ib_uevent_object, uobject); 566 567 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 568 event->event, &uobj->event_list, 569 &uobj->events_reported); 570 } 571 572 void ib_uverbs_event_handler(struct ib_event_handler *handler, 573 struct ib_event *event) 574 { 575 struct ib_uverbs_file *file = 576 container_of(handler, struct ib_uverbs_file, event_handler); 577 578 ib_uverbs_async_handler(file, event->element.port_num, event->event, 579 NULL, NULL); 580 } 581 582 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 583 { 584 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file); 585 file->async_file = NULL; 586 } 587 588 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) 589 { 590 spin_lock_init(&ev_queue->lock); 591 INIT_LIST_HEAD(&ev_queue->event_list); 592 init_waitqueue_head(&ev_queue->poll_wait); 593 ev_queue->is_closed = 0; 594 ev_queue->async_queue = NULL; 595 } 596 597 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, 598 struct ib_device *ib_dev) 599 { 600 struct ib_uverbs_async_event_file *ev_file; 601 struct file *filp; 602 603 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 604 if (!ev_file) 605 return ERR_PTR(-ENOMEM); 606 607 ib_uverbs_init_event_queue(&ev_file->ev_queue); 608 ev_file->uverbs_file = uverbs_file; 609 kref_get(&ev_file->uverbs_file->ref); 610 kref_init(&ev_file->ref); 611 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops, 612 ev_file, O_RDONLY); 613 if (IS_ERR(filp)) 614 goto err_put_refs; 615 616 mutex_lock(&uverbs_file->device->lists_mutex); 617 list_add_tail(&ev_file->list, 618 &uverbs_file->device->uverbs_events_file_list); 619 mutex_unlock(&uverbs_file->device->lists_mutex); 620 621 WARN_ON(uverbs_file->async_file); 622 uverbs_file->async_file = ev_file; 623 kref_get(&uverbs_file->async_file->ref); 624 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 625 ib_dev, 626 ib_uverbs_event_handler); 627 ib_register_event_handler(&uverbs_file->event_handler); 628 /* At that point async file stuff was fully set */ 629 630 return filp; 631 632 err_put_refs: 633 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 634 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file); 635 return filp; 636 } 637 638 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 639 { 640 u64 mask; 641 642 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 643 mask = ib_dev->uverbs_cmd_mask; 644 else 645 mask = ib_dev->uverbs_ex_cmd_mask; 646 647 if (mask & ((u64)1 << command)) 648 return 0; 649 650 return -1; 651 } 652 653 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 654 size_t count, loff_t *pos) 655 { 656 struct ib_uverbs_file *file = filp->private_data; 657 struct ib_device *ib_dev; 658 struct ib_uverbs_cmd_hdr hdr; 659 __u32 command; 660 __u32 flags; 661 int srcu_key; 662 ssize_t ret; 663 664 if (!ib_safe_file_access(filp)) { 665 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", 666 task_tgid_vnr(current), current->comm); 667 return -EACCES; 668 } 669 670 if (count < sizeof hdr) 671 return -EINVAL; 672 673 if (copy_from_user(&hdr, buf, sizeof hdr)) 674 return -EFAULT; 675 676 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 677 ib_dev = srcu_dereference(file->device->ib_dev, 678 &file->device->disassociate_srcu); 679 if (!ib_dev) { 680 ret = -EIO; 681 goto out; 682 } 683 684 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 685 IB_USER_VERBS_CMD_COMMAND_MASK)) { 686 ret = -EINVAL; 687 goto out; 688 } 689 690 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 691 if (verify_command_mask(ib_dev, command)) { 692 ret = -EOPNOTSUPP; 693 goto out; 694 } 695 696 if (!file->ucontext && 697 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 698 ret = -EINVAL; 699 goto out; 700 } 701 702 flags = (hdr.command & 703 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 704 705 if (!flags) { 706 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 707 !uverbs_cmd_table[command]) { 708 ret = -EINVAL; 709 goto out; 710 } 711 712 if (hdr.in_words * 4 != count) { 713 ret = -EINVAL; 714 goto out; 715 } 716 717 ret = uverbs_cmd_table[command](file, ib_dev, 718 buf + sizeof(hdr), 719 hdr.in_words * 4, 720 hdr.out_words * 4); 721 722 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 723 struct ib_uverbs_ex_cmd_hdr ex_hdr; 724 struct ib_udata ucore; 725 struct ib_udata uhw; 726 size_t written_count = count; 727 728 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 729 !uverbs_ex_cmd_table[command]) { 730 ret = -ENOSYS; 731 goto out; 732 } 733 734 if (!file->ucontext) { 735 ret = -EINVAL; 736 goto out; 737 } 738 739 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 740 ret = -EINVAL; 741 goto out; 742 } 743 744 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 745 ret = -EFAULT; 746 goto out; 747 } 748 749 count -= sizeof(hdr) + sizeof(ex_hdr); 750 buf += sizeof(hdr) + sizeof(ex_hdr); 751 752 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 753 ret = -EINVAL; 754 goto out; 755 } 756 757 if (ex_hdr.cmd_hdr_reserved) { 758 ret = -EINVAL; 759 goto out; 760 } 761 762 if (ex_hdr.response) { 763 if (!hdr.out_words && !ex_hdr.provider_out_words) { 764 ret = -EINVAL; 765 goto out; 766 } 767 768 if (!access_ok(VERIFY_WRITE, 769 u64_to_user_ptr(ex_hdr.response), 770 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 771 ret = -EFAULT; 772 goto out; 773 } 774 } else { 775 if (hdr.out_words || ex_hdr.provider_out_words) { 776 ret = -EINVAL; 777 goto out; 778 } 779 } 780 781 ib_uverbs_init_udata_buf_or_null(&ucore, buf, 782 u64_to_user_ptr(ex_hdr.response), 783 hdr.in_words * 8, hdr.out_words * 8); 784 785 ib_uverbs_init_udata_buf_or_null(&uhw, 786 buf + ucore.inlen, 787 u64_to_user_ptr(ex_hdr.response) + ucore.outlen, 788 ex_hdr.provider_in_words * 8, 789 ex_hdr.provider_out_words * 8); 790 791 ret = uverbs_ex_cmd_table[command](file, ib_dev, &ucore, &uhw); 792 if (!ret) 793 ret = written_count; 794 } else { 795 ret = -ENOSYS; 796 } 797 798 out: 799 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 800 return ret; 801 } 802 803 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 804 { 805 struct ib_uverbs_file *file = filp->private_data; 806 struct ib_device *ib_dev; 807 int ret = 0; 808 int srcu_key; 809 810 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 811 ib_dev = srcu_dereference(file->device->ib_dev, 812 &file->device->disassociate_srcu); 813 if (!ib_dev) { 814 ret = -EIO; 815 goto out; 816 } 817 818 if (!file->ucontext) 819 ret = -ENODEV; 820 else 821 ret = ib_dev->mmap(file->ucontext, vma); 822 out: 823 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 824 return ret; 825 } 826 827 /* 828 * ib_uverbs_open() does not need the BKL: 829 * 830 * - the ib_uverbs_device structures are properly reference counted and 831 * everything else is purely local to the file being created, so 832 * races against other open calls are not a problem; 833 * - there is no ioctl method to race against; 834 * - the open method will either immediately run -ENXIO, or all 835 * required initialization will be done. 836 */ 837 static int ib_uverbs_open(struct inode *inode, struct file *filp) 838 { 839 struct ib_uverbs_device *dev; 840 struct ib_uverbs_file *file; 841 struct ib_device *ib_dev; 842 int ret; 843 int module_dependent; 844 int srcu_key; 845 846 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 847 if (!atomic_inc_not_zero(&dev->refcount)) 848 return -ENXIO; 849 850 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 851 mutex_lock(&dev->lists_mutex); 852 ib_dev = srcu_dereference(dev->ib_dev, 853 &dev->disassociate_srcu); 854 if (!ib_dev) { 855 ret = -EIO; 856 goto err; 857 } 858 859 /* In case IB device supports disassociate ucontext, there is no hard 860 * dependency between uverbs device and its low level device. 861 */ 862 module_dependent = !(ib_dev->disassociate_ucontext); 863 864 if (module_dependent) { 865 if (!try_module_get(ib_dev->owner)) { 866 ret = -ENODEV; 867 goto err; 868 } 869 } 870 871 file = kzalloc(sizeof(*file), GFP_KERNEL); 872 if (!file) { 873 ret = -ENOMEM; 874 if (module_dependent) 875 goto err_module; 876 877 goto err; 878 } 879 880 file->device = dev; 881 spin_lock_init(&file->idr_lock); 882 idr_init(&file->idr); 883 file->ucontext = NULL; 884 file->async_file = NULL; 885 kref_init(&file->ref); 886 mutex_init(&file->mutex); 887 mutex_init(&file->cleanup_mutex); 888 889 filp->private_data = file; 890 kobject_get(&dev->kobj); 891 list_add_tail(&file->list, &dev->uverbs_file_list); 892 mutex_unlock(&dev->lists_mutex); 893 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 894 895 return nonseekable_open(inode, filp); 896 897 err_module: 898 module_put(ib_dev->owner); 899 900 err: 901 mutex_unlock(&dev->lists_mutex); 902 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 903 if (atomic_dec_and_test(&dev->refcount)) 904 ib_uverbs_comp_dev(dev); 905 906 return ret; 907 } 908 909 static int ib_uverbs_close(struct inode *inode, struct file *filp) 910 { 911 struct ib_uverbs_file *file = filp->private_data; 912 913 mutex_lock(&file->cleanup_mutex); 914 if (file->ucontext) { 915 ib_uverbs_cleanup_ucontext(file, file->ucontext, false); 916 file->ucontext = NULL; 917 } 918 mutex_unlock(&file->cleanup_mutex); 919 idr_destroy(&file->idr); 920 921 mutex_lock(&file->device->lists_mutex); 922 if (!file->is_closed) { 923 list_del(&file->list); 924 file->is_closed = 1; 925 } 926 mutex_unlock(&file->device->lists_mutex); 927 928 if (file->async_file) 929 kref_put(&file->async_file->ref, 930 ib_uverbs_release_async_event_file); 931 932 kref_put(&file->ref, ib_uverbs_release_file); 933 934 return 0; 935 } 936 937 static const struct file_operations uverbs_fops = { 938 .owner = THIS_MODULE, 939 .write = ib_uverbs_write, 940 .open = ib_uverbs_open, 941 .release = ib_uverbs_close, 942 .llseek = no_llseek, 943 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) 944 .unlocked_ioctl = ib_uverbs_ioctl, 945 #endif 946 }; 947 948 static const struct file_operations uverbs_mmap_fops = { 949 .owner = THIS_MODULE, 950 .write = ib_uverbs_write, 951 .mmap = ib_uverbs_mmap, 952 .open = ib_uverbs_open, 953 .release = ib_uverbs_close, 954 .llseek = no_llseek, 955 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) 956 .unlocked_ioctl = ib_uverbs_ioctl, 957 #endif 958 }; 959 960 static struct ib_client uverbs_client = { 961 .name = "uverbs", 962 .add = ib_uverbs_add_one, 963 .remove = ib_uverbs_remove_one 964 }; 965 966 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 967 char *buf) 968 { 969 int ret = -ENODEV; 970 int srcu_key; 971 struct ib_uverbs_device *dev = dev_get_drvdata(device); 972 struct ib_device *ib_dev; 973 974 if (!dev) 975 return -ENODEV; 976 977 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 978 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 979 if (ib_dev) 980 ret = sprintf(buf, "%s\n", ib_dev->name); 981 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 982 983 return ret; 984 } 985 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 986 987 static ssize_t show_dev_abi_version(struct device *device, 988 struct device_attribute *attr, char *buf) 989 { 990 struct ib_uverbs_device *dev = dev_get_drvdata(device); 991 int ret = -ENODEV; 992 int srcu_key; 993 struct ib_device *ib_dev; 994 995 if (!dev) 996 return -ENODEV; 997 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 998 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 999 if (ib_dev) 1000 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 1001 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1002 1003 return ret; 1004 } 1005 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1006 1007 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1008 __stringify(IB_USER_VERBS_ABI_VERSION)); 1009 1010 static void ib_uverbs_add_one(struct ib_device *device) 1011 { 1012 int devnum; 1013 dev_t base; 1014 struct ib_uverbs_device *uverbs_dev; 1015 int ret; 1016 1017 if (!device->alloc_ucontext) 1018 return; 1019 1020 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1021 if (!uverbs_dev) 1022 return; 1023 1024 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1025 if (ret) { 1026 kfree(uverbs_dev); 1027 return; 1028 } 1029 1030 atomic_set(&uverbs_dev->refcount, 1); 1031 init_completion(&uverbs_dev->comp); 1032 uverbs_dev->xrcd_tree = RB_ROOT; 1033 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1034 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1035 mutex_init(&uverbs_dev->lists_mutex); 1036 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1037 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1038 1039 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1040 if (devnum >= IB_UVERBS_MAX_DEVICES) 1041 goto err; 1042 uverbs_dev->devnum = devnum; 1043 set_bit(devnum, dev_map); 1044 if (devnum >= IB_UVERBS_NUM_FIXED_MINOR) 1045 base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR; 1046 else 1047 base = IB_UVERBS_BASE_DEV + devnum; 1048 1049 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1050 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1051 1052 cdev_init(&uverbs_dev->cdev, NULL); 1053 uverbs_dev->cdev.owner = THIS_MODULE; 1054 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1055 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj); 1056 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1057 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1058 goto err_cdev; 1059 1060 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent, 1061 uverbs_dev->cdev.dev, uverbs_dev, 1062 "uverbs%d", uverbs_dev->devnum); 1063 if (IS_ERR(uverbs_dev->dev)) 1064 goto err_cdev; 1065 1066 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1067 goto err_class; 1068 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1069 goto err_class; 1070 1071 if (!device->specs_root) { 1072 const struct uverbs_object_tree_def *default_root[] = { 1073 uverbs_default_get_objects()}; 1074 1075 uverbs_dev->specs_root = uverbs_alloc_spec_tree(1, 1076 default_root); 1077 if (IS_ERR(uverbs_dev->specs_root)) 1078 goto err_class; 1079 1080 device->specs_root = uverbs_dev->specs_root; 1081 } 1082 1083 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1084 1085 return; 1086 1087 err_class: 1088 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1089 1090 err_cdev: 1091 cdev_del(&uverbs_dev->cdev); 1092 clear_bit(devnum, dev_map); 1093 1094 err: 1095 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1096 ib_uverbs_comp_dev(uverbs_dev); 1097 wait_for_completion(&uverbs_dev->comp); 1098 kobject_put(&uverbs_dev->kobj); 1099 return; 1100 } 1101 1102 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1103 struct ib_device *ib_dev) 1104 { 1105 struct ib_uverbs_file *file; 1106 struct ib_uverbs_async_event_file *event_file; 1107 struct ib_event event; 1108 1109 /* Pending running commands to terminate */ 1110 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1111 event.event = IB_EVENT_DEVICE_FATAL; 1112 event.element.port_num = 0; 1113 event.device = ib_dev; 1114 1115 mutex_lock(&uverbs_dev->lists_mutex); 1116 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1117 struct ib_ucontext *ucontext; 1118 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1119 struct ib_uverbs_file, list); 1120 file->is_closed = 1; 1121 list_del(&file->list); 1122 kref_get(&file->ref); 1123 mutex_unlock(&uverbs_dev->lists_mutex); 1124 1125 1126 mutex_lock(&file->cleanup_mutex); 1127 ucontext = file->ucontext; 1128 file->ucontext = NULL; 1129 mutex_unlock(&file->cleanup_mutex); 1130 1131 /* At this point ib_uverbs_close cannot be running 1132 * ib_uverbs_cleanup_ucontext 1133 */ 1134 if (ucontext) { 1135 /* We must release the mutex before going ahead and 1136 * calling disassociate_ucontext. disassociate_ucontext 1137 * might end up indirectly calling uverbs_close, 1138 * for example due to freeing the resources 1139 * (e.g mmput). 1140 */ 1141 ib_uverbs_event_handler(&file->event_handler, &event); 1142 ib_dev->disassociate_ucontext(ucontext); 1143 mutex_lock(&file->cleanup_mutex); 1144 ib_uverbs_cleanup_ucontext(file, ucontext, true); 1145 mutex_unlock(&file->cleanup_mutex); 1146 } 1147 1148 mutex_lock(&uverbs_dev->lists_mutex); 1149 kref_put(&file->ref, ib_uverbs_release_file); 1150 } 1151 1152 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1153 event_file = list_first_entry(&uverbs_dev-> 1154 uverbs_events_file_list, 1155 struct ib_uverbs_async_event_file, 1156 list); 1157 spin_lock_irq(&event_file->ev_queue.lock); 1158 event_file->ev_queue.is_closed = 1; 1159 spin_unlock_irq(&event_file->ev_queue.lock); 1160 1161 list_del(&event_file->list); 1162 ib_unregister_event_handler( 1163 &event_file->uverbs_file->event_handler); 1164 event_file->uverbs_file->event_handler.device = 1165 NULL; 1166 1167 wake_up_interruptible(&event_file->ev_queue.poll_wait); 1168 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN); 1169 } 1170 mutex_unlock(&uverbs_dev->lists_mutex); 1171 } 1172 1173 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1174 { 1175 struct ib_uverbs_device *uverbs_dev = client_data; 1176 int wait_clients = 1; 1177 1178 if (!uverbs_dev) 1179 return; 1180 1181 dev_set_drvdata(uverbs_dev->dev, NULL); 1182 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1183 cdev_del(&uverbs_dev->cdev); 1184 clear_bit(uverbs_dev->devnum, dev_map); 1185 1186 if (device->disassociate_ucontext) { 1187 /* We disassociate HW resources and immediately return. 1188 * Userspace will see a EIO errno for all future access. 1189 * Upon returning, ib_device may be freed internally and is not 1190 * valid any more. 1191 * uverbs_device is still available until all clients close 1192 * their files, then the uverbs device ref count will be zero 1193 * and its resources will be freed. 1194 * Note: At this point no more files can be opened since the 1195 * cdev was deleted, however active clients can still issue 1196 * commands and close their open files. 1197 */ 1198 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1199 ib_uverbs_free_hw_resources(uverbs_dev, device); 1200 wait_clients = 0; 1201 } 1202 1203 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1204 ib_uverbs_comp_dev(uverbs_dev); 1205 if (wait_clients) 1206 wait_for_completion(&uverbs_dev->comp); 1207 if (uverbs_dev->specs_root) { 1208 uverbs_free_spec_tree(uverbs_dev->specs_root); 1209 device->specs_root = NULL; 1210 } 1211 1212 kobject_put(&uverbs_dev->kobj); 1213 } 1214 1215 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1216 { 1217 if (mode) 1218 *mode = 0666; 1219 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1220 } 1221 1222 static int __init ib_uverbs_init(void) 1223 { 1224 int ret; 1225 1226 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, 1227 IB_UVERBS_NUM_FIXED_MINOR, 1228 "infiniband_verbs"); 1229 if (ret) { 1230 pr_err("user_verbs: couldn't register device number\n"); 1231 goto out; 1232 } 1233 1234 ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0, 1235 IB_UVERBS_NUM_DYNAMIC_MINOR, 1236 "infiniband_verbs"); 1237 if (ret) { 1238 pr_err("couldn't register dynamic device number\n"); 1239 goto out_alloc; 1240 } 1241 1242 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1243 if (IS_ERR(uverbs_class)) { 1244 ret = PTR_ERR(uverbs_class); 1245 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1246 goto out_chrdev; 1247 } 1248 1249 uverbs_class->devnode = uverbs_devnode; 1250 1251 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1252 if (ret) { 1253 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1254 goto out_class; 1255 } 1256 1257 ret = ib_register_client(&uverbs_client); 1258 if (ret) { 1259 pr_err("user_verbs: couldn't register client\n"); 1260 goto out_class; 1261 } 1262 1263 return 0; 1264 1265 out_class: 1266 class_destroy(uverbs_class); 1267 1268 out_chrdev: 1269 unregister_chrdev_region(dynamic_uverbs_dev, 1270 IB_UVERBS_NUM_DYNAMIC_MINOR); 1271 1272 out_alloc: 1273 unregister_chrdev_region(IB_UVERBS_BASE_DEV, 1274 IB_UVERBS_NUM_FIXED_MINOR); 1275 1276 out: 1277 return ret; 1278 } 1279 1280 static void __exit ib_uverbs_cleanup(void) 1281 { 1282 ib_unregister_client(&uverbs_client); 1283 class_destroy(uverbs_class); 1284 unregister_chrdev_region(IB_UVERBS_BASE_DEV, 1285 IB_UVERBS_NUM_FIXED_MINOR); 1286 unregister_chrdev_region(dynamic_uverbs_dev, 1287 IB_UVERBS_NUM_DYNAMIC_MINOR); 1288 } 1289 1290 module_init(ib_uverbs_init); 1291 module_exit(ib_uverbs_cleanup); 1292