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 = 32 66 }; 67 68 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 69 70 static struct class *uverbs_class; 71 72 static DEFINE_SPINLOCK(map_lock); 73 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 74 75 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 76 struct ib_device *ib_dev, 77 const char __user *buf, int in_len, 78 int out_len) = { 79 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 80 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 81 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 82 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 83 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 84 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 85 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 86 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 87 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 88 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 89 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 90 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 91 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 92 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 93 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 94 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 95 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 96 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 97 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 98 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 99 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 100 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 101 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 102 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 103 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 104 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 105 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 106 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 107 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 108 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 109 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 110 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 111 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 112 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 113 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 114 }; 115 116 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 117 struct ib_device *ib_dev, 118 struct ib_udata *ucore, 119 struct ib_udata *uhw) = { 120 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 121 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 122 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 123 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 124 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 125 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, 126 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, 127 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, 128 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, 129 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, 130 [IB_USER_VERBS_EX_CMD_MODIFY_QP] = ib_uverbs_ex_modify_qp, 131 [IB_USER_VERBS_EX_CMD_MODIFY_CQ] = ib_uverbs_ex_modify_cq, 132 }; 133 134 static void ib_uverbs_add_one(struct ib_device *device); 135 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 136 137 int uverbs_dealloc_mw(struct ib_mw *mw) 138 { 139 struct ib_pd *pd = mw->pd; 140 int ret; 141 142 ret = mw->device->dealloc_mw(mw); 143 if (!ret) 144 atomic_dec(&pd->usecnt); 145 return ret; 146 } 147 148 static void ib_uverbs_release_dev(struct kobject *kobj) 149 { 150 struct ib_uverbs_device *dev = 151 container_of(kobj, struct ib_uverbs_device, kobj); 152 153 cleanup_srcu_struct(&dev->disassociate_srcu); 154 kfree(dev); 155 } 156 157 static struct kobj_type ib_uverbs_dev_ktype = { 158 .release = ib_uverbs_release_dev, 159 }; 160 161 static void ib_uverbs_release_async_event_file(struct kref *ref) 162 { 163 struct ib_uverbs_async_event_file *file = 164 container_of(ref, struct ib_uverbs_async_event_file, ref); 165 166 kfree(file); 167 } 168 169 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 170 struct ib_uverbs_completion_event_file *ev_file, 171 struct ib_ucq_object *uobj) 172 { 173 struct ib_uverbs_event *evt, *tmp; 174 175 if (ev_file) { 176 spin_lock_irq(&ev_file->ev_queue.lock); 177 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 178 list_del(&evt->list); 179 kfree(evt); 180 } 181 spin_unlock_irq(&ev_file->ev_queue.lock); 182 183 uverbs_uobject_put(&ev_file->uobj_file.uobj); 184 } 185 186 spin_lock_irq(&file->async_file->ev_queue.lock); 187 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 188 list_del(&evt->list); 189 kfree(evt); 190 } 191 spin_unlock_irq(&file->async_file->ev_queue.lock); 192 } 193 194 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 195 struct ib_uevent_object *uobj) 196 { 197 struct ib_uverbs_event *evt, *tmp; 198 199 spin_lock_irq(&file->async_file->ev_queue.lock); 200 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 201 list_del(&evt->list); 202 kfree(evt); 203 } 204 spin_unlock_irq(&file->async_file->ev_queue.lock); 205 } 206 207 void ib_uverbs_detach_umcast(struct ib_qp *qp, 208 struct ib_uqp_object *uobj) 209 { 210 struct ib_uverbs_mcast_entry *mcast, *tmp; 211 212 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 213 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 214 list_del(&mcast->list); 215 kfree(mcast); 216 } 217 } 218 219 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 220 struct ib_ucontext *context, 221 bool device_removed) 222 { 223 context->closing = 1; 224 uverbs_cleanup_ucontext(context, device_removed); 225 put_pid(context->tgid); 226 227 ib_rdmacg_uncharge(&context->cg_obj, context->device, 228 RDMACG_RESOURCE_HCA_HANDLE); 229 230 return context->device->dealloc_ucontext(context); 231 } 232 233 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 234 { 235 complete(&dev->comp); 236 } 237 238 void ib_uverbs_release_file(struct kref *ref) 239 { 240 struct ib_uverbs_file *file = 241 container_of(ref, struct ib_uverbs_file, ref); 242 struct ib_device *ib_dev; 243 int srcu_key; 244 245 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 246 ib_dev = srcu_dereference(file->device->ib_dev, 247 &file->device->disassociate_srcu); 248 if (ib_dev && !ib_dev->disassociate_ucontext) 249 module_put(ib_dev->owner); 250 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 251 252 if (atomic_dec_and_test(&file->device->refcount)) 253 ib_uverbs_comp_dev(file->device); 254 255 kobject_put(&file->device->kobj); 256 kfree(file); 257 } 258 259 static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, 260 struct ib_uverbs_file *uverbs_file, 261 struct file *filp, char __user *buf, 262 size_t count, loff_t *pos, 263 size_t eventsz) 264 { 265 struct ib_uverbs_event *event; 266 int ret = 0; 267 268 spin_lock_irq(&ev_queue->lock); 269 270 while (list_empty(&ev_queue->event_list)) { 271 spin_unlock_irq(&ev_queue->lock); 272 273 if (filp->f_flags & O_NONBLOCK) 274 return -EAGAIN; 275 276 if (wait_event_interruptible(ev_queue->poll_wait, 277 (!list_empty(&ev_queue->event_list) || 278 /* The barriers built into wait_event_interruptible() 279 * and wake_up() guarentee this will see the null set 280 * without using RCU 281 */ 282 !uverbs_file->device->ib_dev))) 283 return -ERESTARTSYS; 284 285 /* If device was disassociated and no event exists set an error */ 286 if (list_empty(&ev_queue->event_list) && 287 !uverbs_file->device->ib_dev) 288 return -EIO; 289 290 spin_lock_irq(&ev_queue->lock); 291 } 292 293 event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); 294 295 if (eventsz > count) { 296 ret = -EINVAL; 297 event = NULL; 298 } else { 299 list_del(ev_queue->event_list.next); 300 if (event->counter) { 301 ++(*event->counter); 302 list_del(&event->obj_list); 303 } 304 } 305 306 spin_unlock_irq(&ev_queue->lock); 307 308 if (event) { 309 if (copy_to_user(buf, event, eventsz)) 310 ret = -EFAULT; 311 else 312 ret = eventsz; 313 } 314 315 kfree(event); 316 317 return ret; 318 } 319 320 static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, 321 size_t count, loff_t *pos) 322 { 323 struct ib_uverbs_async_event_file *file = filp->private_data; 324 325 return ib_uverbs_event_read(&file->ev_queue, file->uverbs_file, filp, 326 buf, count, pos, 327 sizeof(struct ib_uverbs_async_event_desc)); 328 } 329 330 static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, 331 size_t count, loff_t *pos) 332 { 333 struct ib_uverbs_completion_event_file *comp_ev_file = 334 filp->private_data; 335 336 return ib_uverbs_event_read(&comp_ev_file->ev_queue, 337 comp_ev_file->uobj_file.ufile, filp, 338 buf, count, pos, 339 sizeof(struct ib_uverbs_comp_event_desc)); 340 } 341 342 static unsigned int ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, 343 struct file *filp, 344 struct poll_table_struct *wait) 345 { 346 unsigned int pollflags = 0; 347 348 poll_wait(filp, &ev_queue->poll_wait, wait); 349 350 spin_lock_irq(&ev_queue->lock); 351 if (!list_empty(&ev_queue->event_list)) 352 pollflags = POLLIN | POLLRDNORM; 353 spin_unlock_irq(&ev_queue->lock); 354 355 return pollflags; 356 } 357 358 static unsigned int ib_uverbs_async_event_poll(struct file *filp, 359 struct poll_table_struct *wait) 360 { 361 return ib_uverbs_event_poll(filp->private_data, filp, wait); 362 } 363 364 static unsigned int ib_uverbs_comp_event_poll(struct file *filp, 365 struct poll_table_struct *wait) 366 { 367 struct ib_uverbs_completion_event_file *comp_ev_file = 368 filp->private_data; 369 370 return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); 371 } 372 373 static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) 374 { 375 struct ib_uverbs_event_queue *ev_queue = filp->private_data; 376 377 return fasync_helper(fd, filp, on, &ev_queue->async_queue); 378 } 379 380 static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) 381 { 382 struct ib_uverbs_completion_event_file *comp_ev_file = 383 filp->private_data; 384 385 return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); 386 } 387 388 static int ib_uverbs_async_event_close(struct inode *inode, struct file *filp) 389 { 390 struct ib_uverbs_async_event_file *file = filp->private_data; 391 struct ib_uverbs_file *uverbs_file = file->uverbs_file; 392 struct ib_uverbs_event *entry, *tmp; 393 int closed_already = 0; 394 395 mutex_lock(&uverbs_file->device->lists_mutex); 396 spin_lock_irq(&file->ev_queue.lock); 397 closed_already = file->ev_queue.is_closed; 398 file->ev_queue.is_closed = 1; 399 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 400 if (entry->counter) 401 list_del(&entry->obj_list); 402 kfree(entry); 403 } 404 spin_unlock_irq(&file->ev_queue.lock); 405 if (!closed_already) { 406 list_del(&file->list); 407 ib_unregister_event_handler(&uverbs_file->event_handler); 408 } 409 mutex_unlock(&uverbs_file->device->lists_mutex); 410 411 kref_put(&uverbs_file->ref, ib_uverbs_release_file); 412 kref_put(&file->ref, ib_uverbs_release_async_event_file); 413 414 return 0; 415 } 416 417 static int ib_uverbs_comp_event_close(struct inode *inode, struct file *filp) 418 { 419 struct ib_uverbs_completion_event_file *file = filp->private_data; 420 struct ib_uverbs_event *entry, *tmp; 421 422 spin_lock_irq(&file->ev_queue.lock); 423 list_for_each_entry_safe(entry, tmp, &file->ev_queue.event_list, list) { 424 if (entry->counter) 425 list_del(&entry->obj_list); 426 kfree(entry); 427 } 428 spin_unlock_irq(&file->ev_queue.lock); 429 430 uverbs_close_fd(filp); 431 432 return 0; 433 } 434 435 const struct file_operations uverbs_event_fops = { 436 .owner = THIS_MODULE, 437 .read = ib_uverbs_comp_event_read, 438 .poll = ib_uverbs_comp_event_poll, 439 .release = ib_uverbs_comp_event_close, 440 .fasync = ib_uverbs_comp_event_fasync, 441 .llseek = no_llseek, 442 }; 443 444 static const struct file_operations uverbs_async_event_fops = { 445 .owner = THIS_MODULE, 446 .read = ib_uverbs_async_event_read, 447 .poll = ib_uverbs_async_event_poll, 448 .release = ib_uverbs_async_event_close, 449 .fasync = ib_uverbs_async_event_fasync, 450 .llseek = no_llseek, 451 }; 452 453 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 454 { 455 struct ib_uverbs_event_queue *ev_queue = cq_context; 456 struct ib_ucq_object *uobj; 457 struct ib_uverbs_event *entry; 458 unsigned long flags; 459 460 if (!ev_queue) 461 return; 462 463 spin_lock_irqsave(&ev_queue->lock, flags); 464 if (ev_queue->is_closed) { 465 spin_unlock_irqrestore(&ev_queue->lock, flags); 466 return; 467 } 468 469 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 470 if (!entry) { 471 spin_unlock_irqrestore(&ev_queue->lock, flags); 472 return; 473 } 474 475 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 476 477 entry->desc.comp.cq_handle = cq->uobject->user_handle; 478 entry->counter = &uobj->comp_events_reported; 479 480 list_add_tail(&entry->list, &ev_queue->event_list); 481 list_add_tail(&entry->obj_list, &uobj->comp_list); 482 spin_unlock_irqrestore(&ev_queue->lock, flags); 483 484 wake_up_interruptible(&ev_queue->poll_wait); 485 kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); 486 } 487 488 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 489 __u64 element, __u64 event, 490 struct list_head *obj_list, 491 u32 *counter) 492 { 493 struct ib_uverbs_event *entry; 494 unsigned long flags; 495 496 spin_lock_irqsave(&file->async_file->ev_queue.lock, flags); 497 if (file->async_file->ev_queue.is_closed) { 498 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 499 return; 500 } 501 502 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 503 if (!entry) { 504 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 505 return; 506 } 507 508 entry->desc.async.element = element; 509 entry->desc.async.event_type = event; 510 entry->desc.async.reserved = 0; 511 entry->counter = counter; 512 513 list_add_tail(&entry->list, &file->async_file->ev_queue.event_list); 514 if (obj_list) 515 list_add_tail(&entry->obj_list, obj_list); 516 spin_unlock_irqrestore(&file->async_file->ev_queue.lock, flags); 517 518 wake_up_interruptible(&file->async_file->ev_queue.poll_wait); 519 kill_fasync(&file->async_file->ev_queue.async_queue, SIGIO, POLL_IN); 520 } 521 522 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 523 { 524 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 525 struct ib_ucq_object, uobject); 526 527 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 528 event->event, &uobj->async_list, 529 &uobj->async_events_reported); 530 } 531 532 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 533 { 534 struct ib_uevent_object *uobj; 535 536 /* for XRC target qp's, check that qp is live */ 537 if (!event->element.qp->uobject) 538 return; 539 540 uobj = container_of(event->element.qp->uobject, 541 struct ib_uevent_object, uobject); 542 543 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 544 event->event, &uobj->event_list, 545 &uobj->events_reported); 546 } 547 548 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 549 { 550 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 551 struct ib_uevent_object, uobject); 552 553 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 554 event->event, &uobj->event_list, 555 &uobj->events_reported); 556 } 557 558 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 559 { 560 struct ib_uevent_object *uobj; 561 562 uobj = container_of(event->element.srq->uobject, 563 struct ib_uevent_object, uobject); 564 565 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 566 event->event, &uobj->event_list, 567 &uobj->events_reported); 568 } 569 570 void ib_uverbs_event_handler(struct ib_event_handler *handler, 571 struct ib_event *event) 572 { 573 struct ib_uverbs_file *file = 574 container_of(handler, struct ib_uverbs_file, event_handler); 575 576 ib_uverbs_async_handler(file, event->element.port_num, event->event, 577 NULL, NULL); 578 } 579 580 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 581 { 582 kref_put(&file->async_file->ref, ib_uverbs_release_async_event_file); 583 file->async_file = NULL; 584 } 585 586 void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) 587 { 588 spin_lock_init(&ev_queue->lock); 589 INIT_LIST_HEAD(&ev_queue->event_list); 590 init_waitqueue_head(&ev_queue->poll_wait); 591 ev_queue->is_closed = 0; 592 ev_queue->async_queue = NULL; 593 } 594 595 struct file *ib_uverbs_alloc_async_event_file(struct ib_uverbs_file *uverbs_file, 596 struct ib_device *ib_dev) 597 { 598 struct ib_uverbs_async_event_file *ev_file; 599 struct file *filp; 600 601 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 602 if (!ev_file) 603 return ERR_PTR(-ENOMEM); 604 605 ib_uverbs_init_event_queue(&ev_file->ev_queue); 606 ev_file->uverbs_file = uverbs_file; 607 kref_get(&ev_file->uverbs_file->ref); 608 kref_init(&ev_file->ref); 609 filp = anon_inode_getfile("[infinibandevent]", &uverbs_async_event_fops, 610 ev_file, O_RDONLY); 611 if (IS_ERR(filp)) 612 goto err_put_refs; 613 614 mutex_lock(&uverbs_file->device->lists_mutex); 615 list_add_tail(&ev_file->list, 616 &uverbs_file->device->uverbs_events_file_list); 617 mutex_unlock(&uverbs_file->device->lists_mutex); 618 619 WARN_ON(uverbs_file->async_file); 620 uverbs_file->async_file = ev_file; 621 kref_get(&uverbs_file->async_file->ref); 622 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 623 ib_dev, 624 ib_uverbs_event_handler); 625 ib_register_event_handler(&uverbs_file->event_handler); 626 /* At that point async file stuff was fully set */ 627 628 return filp; 629 630 err_put_refs: 631 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 632 kref_put(&ev_file->ref, ib_uverbs_release_async_event_file); 633 return filp; 634 } 635 636 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 637 { 638 u64 mask; 639 640 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 641 mask = ib_dev->uverbs_cmd_mask; 642 else 643 mask = ib_dev->uverbs_ex_cmd_mask; 644 645 if (mask & ((u64)1 << command)) 646 return 0; 647 648 return -1; 649 } 650 651 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 652 size_t count, loff_t *pos) 653 { 654 struct ib_uverbs_file *file = filp->private_data; 655 struct ib_device *ib_dev; 656 struct ib_uverbs_cmd_hdr hdr; 657 __u32 command; 658 __u32 flags; 659 int srcu_key; 660 ssize_t ret; 661 662 if (!ib_safe_file_access(filp)) { 663 pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", 664 task_tgid_vnr(current), current->comm); 665 return -EACCES; 666 } 667 668 if (count < sizeof hdr) 669 return -EINVAL; 670 671 if (copy_from_user(&hdr, buf, sizeof hdr)) 672 return -EFAULT; 673 674 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 675 ib_dev = srcu_dereference(file->device->ib_dev, 676 &file->device->disassociate_srcu); 677 if (!ib_dev) { 678 ret = -EIO; 679 goto out; 680 } 681 682 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 683 IB_USER_VERBS_CMD_COMMAND_MASK)) { 684 ret = -EINVAL; 685 goto out; 686 } 687 688 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 689 if (verify_command_mask(ib_dev, command)) { 690 ret = -EOPNOTSUPP; 691 goto out; 692 } 693 694 if (!file->ucontext && 695 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 696 ret = -EINVAL; 697 goto out; 698 } 699 700 flags = (hdr.command & 701 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 702 703 if (!flags) { 704 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 705 !uverbs_cmd_table[command]) { 706 ret = -EINVAL; 707 goto out; 708 } 709 710 if (hdr.in_words * 4 != count) { 711 ret = -EINVAL; 712 goto out; 713 } 714 715 ret = uverbs_cmd_table[command](file, ib_dev, 716 buf + sizeof(hdr), 717 hdr.in_words * 4, 718 hdr.out_words * 4); 719 720 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 721 struct ib_uverbs_ex_cmd_hdr ex_hdr; 722 struct ib_udata ucore; 723 struct ib_udata uhw; 724 size_t written_count = count; 725 726 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 727 !uverbs_ex_cmd_table[command]) { 728 ret = -ENOSYS; 729 goto out; 730 } 731 732 if (!file->ucontext) { 733 ret = -EINVAL; 734 goto out; 735 } 736 737 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 738 ret = -EINVAL; 739 goto out; 740 } 741 742 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 743 ret = -EFAULT; 744 goto out; 745 } 746 747 count -= sizeof(hdr) + sizeof(ex_hdr); 748 buf += sizeof(hdr) + sizeof(ex_hdr); 749 750 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 751 ret = -EINVAL; 752 goto out; 753 } 754 755 if (ex_hdr.cmd_hdr_reserved) { 756 ret = -EINVAL; 757 goto out; 758 } 759 760 if (ex_hdr.response) { 761 if (!hdr.out_words && !ex_hdr.provider_out_words) { 762 ret = -EINVAL; 763 goto out; 764 } 765 766 if (!access_ok(VERIFY_WRITE, 767 u64_to_user_ptr(ex_hdr.response), 768 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 769 ret = -EFAULT; 770 goto out; 771 } 772 } else { 773 if (hdr.out_words || ex_hdr.provider_out_words) { 774 ret = -EINVAL; 775 goto out; 776 } 777 } 778 779 ib_uverbs_init_udata_buf_or_null(&ucore, buf, 780 u64_to_user_ptr(ex_hdr.response), 781 hdr.in_words * 8, hdr.out_words * 8); 782 783 ib_uverbs_init_udata_buf_or_null(&uhw, 784 buf + ucore.inlen, 785 u64_to_user_ptr(ex_hdr.response) + ucore.outlen, 786 ex_hdr.provider_in_words * 8, 787 ex_hdr.provider_out_words * 8); 788 789 ret = uverbs_ex_cmd_table[command](file, ib_dev, &ucore, &uhw); 790 if (!ret) 791 ret = written_count; 792 } else { 793 ret = -ENOSYS; 794 } 795 796 out: 797 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 798 return ret; 799 } 800 801 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 802 { 803 struct ib_uverbs_file *file = filp->private_data; 804 struct ib_device *ib_dev; 805 int ret = 0; 806 int srcu_key; 807 808 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 809 ib_dev = srcu_dereference(file->device->ib_dev, 810 &file->device->disassociate_srcu); 811 if (!ib_dev) { 812 ret = -EIO; 813 goto out; 814 } 815 816 if (!file->ucontext) 817 ret = -ENODEV; 818 else 819 ret = ib_dev->mmap(file->ucontext, vma); 820 out: 821 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 822 return ret; 823 } 824 825 /* 826 * ib_uverbs_open() does not need the BKL: 827 * 828 * - the ib_uverbs_device structures are properly reference counted and 829 * everything else is purely local to the file being created, so 830 * races against other open calls are not a problem; 831 * - there is no ioctl method to race against; 832 * - the open method will either immediately run -ENXIO, or all 833 * required initialization will be done. 834 */ 835 static int ib_uverbs_open(struct inode *inode, struct file *filp) 836 { 837 struct ib_uverbs_device *dev; 838 struct ib_uverbs_file *file; 839 struct ib_device *ib_dev; 840 int ret; 841 int module_dependent; 842 int srcu_key; 843 844 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 845 if (!atomic_inc_not_zero(&dev->refcount)) 846 return -ENXIO; 847 848 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 849 mutex_lock(&dev->lists_mutex); 850 ib_dev = srcu_dereference(dev->ib_dev, 851 &dev->disassociate_srcu); 852 if (!ib_dev) { 853 ret = -EIO; 854 goto err; 855 } 856 857 /* In case IB device supports disassociate ucontext, there is no hard 858 * dependency between uverbs device and its low level device. 859 */ 860 module_dependent = !(ib_dev->disassociate_ucontext); 861 862 if (module_dependent) { 863 if (!try_module_get(ib_dev->owner)) { 864 ret = -ENODEV; 865 goto err; 866 } 867 } 868 869 file = kzalloc(sizeof(*file), GFP_KERNEL); 870 if (!file) { 871 ret = -ENOMEM; 872 if (module_dependent) 873 goto err_module; 874 875 goto err; 876 } 877 878 file->device = dev; 879 spin_lock_init(&file->idr_lock); 880 idr_init(&file->idr); 881 file->ucontext = NULL; 882 file->async_file = NULL; 883 kref_init(&file->ref); 884 mutex_init(&file->mutex); 885 mutex_init(&file->cleanup_mutex); 886 887 filp->private_data = file; 888 kobject_get(&dev->kobj); 889 list_add_tail(&file->list, &dev->uverbs_file_list); 890 mutex_unlock(&dev->lists_mutex); 891 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 892 893 return nonseekable_open(inode, filp); 894 895 err_module: 896 module_put(ib_dev->owner); 897 898 err: 899 mutex_unlock(&dev->lists_mutex); 900 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 901 if (atomic_dec_and_test(&dev->refcount)) 902 ib_uverbs_comp_dev(dev); 903 904 return ret; 905 } 906 907 static int ib_uverbs_close(struct inode *inode, struct file *filp) 908 { 909 struct ib_uverbs_file *file = filp->private_data; 910 911 mutex_lock(&file->cleanup_mutex); 912 if (file->ucontext) { 913 ib_uverbs_cleanup_ucontext(file, file->ucontext, false); 914 file->ucontext = NULL; 915 } 916 mutex_unlock(&file->cleanup_mutex); 917 idr_destroy(&file->idr); 918 919 mutex_lock(&file->device->lists_mutex); 920 if (!file->is_closed) { 921 list_del(&file->list); 922 file->is_closed = 1; 923 } 924 mutex_unlock(&file->device->lists_mutex); 925 926 if (file->async_file) 927 kref_put(&file->async_file->ref, 928 ib_uverbs_release_async_event_file); 929 930 kref_put(&file->ref, ib_uverbs_release_file); 931 932 return 0; 933 } 934 935 static const struct file_operations uverbs_fops = { 936 .owner = THIS_MODULE, 937 .write = ib_uverbs_write, 938 .open = ib_uverbs_open, 939 .release = ib_uverbs_close, 940 .llseek = no_llseek, 941 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) 942 .unlocked_ioctl = ib_uverbs_ioctl, 943 #endif 944 }; 945 946 static const struct file_operations uverbs_mmap_fops = { 947 .owner = THIS_MODULE, 948 .write = ib_uverbs_write, 949 .mmap = ib_uverbs_mmap, 950 .open = ib_uverbs_open, 951 .release = ib_uverbs_close, 952 .llseek = no_llseek, 953 #if IS_ENABLED(CONFIG_INFINIBAND_EXP_USER_ACCESS) 954 .unlocked_ioctl = ib_uverbs_ioctl, 955 #endif 956 }; 957 958 static struct ib_client uverbs_client = { 959 .name = "uverbs", 960 .add = ib_uverbs_add_one, 961 .remove = ib_uverbs_remove_one 962 }; 963 964 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 965 char *buf) 966 { 967 int ret = -ENODEV; 968 int srcu_key; 969 struct ib_uverbs_device *dev = dev_get_drvdata(device); 970 struct ib_device *ib_dev; 971 972 if (!dev) 973 return -ENODEV; 974 975 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 976 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 977 if (ib_dev) 978 ret = sprintf(buf, "%s\n", ib_dev->name); 979 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 980 981 return ret; 982 } 983 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 984 985 static ssize_t show_dev_abi_version(struct device *device, 986 struct device_attribute *attr, char *buf) 987 { 988 struct ib_uverbs_device *dev = dev_get_drvdata(device); 989 int ret = -ENODEV; 990 int srcu_key; 991 struct ib_device *ib_dev; 992 993 if (!dev) 994 return -ENODEV; 995 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 996 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 997 if (ib_dev) 998 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 999 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1000 1001 return ret; 1002 } 1003 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1004 1005 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1006 __stringify(IB_USER_VERBS_ABI_VERSION)); 1007 1008 static dev_t overflow_maj; 1009 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1010 1011 /* 1012 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1013 * requesting a new major number and doubling the number of max devices we 1014 * support. It's stupid, but simple. 1015 */ 1016 static int find_overflow_devnum(void) 1017 { 1018 int ret; 1019 1020 if (!overflow_maj) { 1021 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1022 "infiniband_verbs"); 1023 if (ret) { 1024 pr_err("user_verbs: couldn't register dynamic device number\n"); 1025 return ret; 1026 } 1027 } 1028 1029 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1030 if (ret >= IB_UVERBS_MAX_DEVICES) 1031 return -1; 1032 1033 return ret; 1034 } 1035 1036 static void ib_uverbs_add_one(struct ib_device *device) 1037 { 1038 int devnum; 1039 dev_t base; 1040 struct ib_uverbs_device *uverbs_dev; 1041 int ret; 1042 1043 if (!device->alloc_ucontext) 1044 return; 1045 1046 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1047 if (!uverbs_dev) 1048 return; 1049 1050 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1051 if (ret) { 1052 kfree(uverbs_dev); 1053 return; 1054 } 1055 1056 atomic_set(&uverbs_dev->refcount, 1); 1057 init_completion(&uverbs_dev->comp); 1058 uverbs_dev->xrcd_tree = RB_ROOT; 1059 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1060 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1061 mutex_init(&uverbs_dev->lists_mutex); 1062 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1063 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1064 1065 spin_lock(&map_lock); 1066 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1067 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1068 spin_unlock(&map_lock); 1069 devnum = find_overflow_devnum(); 1070 if (devnum < 0) 1071 goto err; 1072 1073 spin_lock(&map_lock); 1074 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1075 base = devnum + overflow_maj; 1076 set_bit(devnum, overflow_map); 1077 } else { 1078 uverbs_dev->devnum = devnum; 1079 base = devnum + IB_UVERBS_BASE_DEV; 1080 set_bit(devnum, dev_map); 1081 } 1082 spin_unlock(&map_lock); 1083 1084 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1085 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1086 1087 cdev_init(&uverbs_dev->cdev, NULL); 1088 uverbs_dev->cdev.owner = THIS_MODULE; 1089 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1090 cdev_set_parent(&uverbs_dev->cdev, &uverbs_dev->kobj); 1091 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1092 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1093 goto err_cdev; 1094 1095 uverbs_dev->dev = device_create(uverbs_class, device->dev.parent, 1096 uverbs_dev->cdev.dev, uverbs_dev, 1097 "uverbs%d", uverbs_dev->devnum); 1098 if (IS_ERR(uverbs_dev->dev)) 1099 goto err_cdev; 1100 1101 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1102 goto err_class; 1103 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1104 goto err_class; 1105 1106 if (!device->specs_root) { 1107 const struct uverbs_object_tree_def *default_root[] = { 1108 uverbs_default_get_objects()}; 1109 1110 uverbs_dev->specs_root = uverbs_alloc_spec_tree(1, 1111 default_root); 1112 if (IS_ERR(uverbs_dev->specs_root)) 1113 goto err_class; 1114 1115 device->specs_root = uverbs_dev->specs_root; 1116 } 1117 1118 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1119 1120 return; 1121 1122 err_class: 1123 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1124 1125 err_cdev: 1126 cdev_del(&uverbs_dev->cdev); 1127 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1128 clear_bit(devnum, dev_map); 1129 else 1130 clear_bit(devnum, overflow_map); 1131 1132 err: 1133 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1134 ib_uverbs_comp_dev(uverbs_dev); 1135 wait_for_completion(&uverbs_dev->comp); 1136 kobject_put(&uverbs_dev->kobj); 1137 return; 1138 } 1139 1140 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1141 struct ib_device *ib_dev) 1142 { 1143 struct ib_uverbs_file *file; 1144 struct ib_uverbs_async_event_file *event_file; 1145 struct ib_event event; 1146 1147 /* Pending running commands to terminate */ 1148 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1149 event.event = IB_EVENT_DEVICE_FATAL; 1150 event.element.port_num = 0; 1151 event.device = ib_dev; 1152 1153 mutex_lock(&uverbs_dev->lists_mutex); 1154 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1155 struct ib_ucontext *ucontext; 1156 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1157 struct ib_uverbs_file, list); 1158 file->is_closed = 1; 1159 list_del(&file->list); 1160 kref_get(&file->ref); 1161 mutex_unlock(&uverbs_dev->lists_mutex); 1162 1163 1164 mutex_lock(&file->cleanup_mutex); 1165 ucontext = file->ucontext; 1166 file->ucontext = NULL; 1167 mutex_unlock(&file->cleanup_mutex); 1168 1169 /* At this point ib_uverbs_close cannot be running 1170 * ib_uverbs_cleanup_ucontext 1171 */ 1172 if (ucontext) { 1173 /* We must release the mutex before going ahead and 1174 * calling disassociate_ucontext. disassociate_ucontext 1175 * might end up indirectly calling uverbs_close, 1176 * for example due to freeing the resources 1177 * (e.g mmput). 1178 */ 1179 ib_uverbs_event_handler(&file->event_handler, &event); 1180 ib_dev->disassociate_ucontext(ucontext); 1181 mutex_lock(&file->cleanup_mutex); 1182 ib_uverbs_cleanup_ucontext(file, ucontext, true); 1183 mutex_unlock(&file->cleanup_mutex); 1184 } 1185 1186 mutex_lock(&uverbs_dev->lists_mutex); 1187 kref_put(&file->ref, ib_uverbs_release_file); 1188 } 1189 1190 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1191 event_file = list_first_entry(&uverbs_dev-> 1192 uverbs_events_file_list, 1193 struct ib_uverbs_async_event_file, 1194 list); 1195 spin_lock_irq(&event_file->ev_queue.lock); 1196 event_file->ev_queue.is_closed = 1; 1197 spin_unlock_irq(&event_file->ev_queue.lock); 1198 1199 list_del(&event_file->list); 1200 ib_unregister_event_handler( 1201 &event_file->uverbs_file->event_handler); 1202 event_file->uverbs_file->event_handler.device = 1203 NULL; 1204 1205 wake_up_interruptible(&event_file->ev_queue.poll_wait); 1206 kill_fasync(&event_file->ev_queue.async_queue, SIGIO, POLL_IN); 1207 } 1208 mutex_unlock(&uverbs_dev->lists_mutex); 1209 } 1210 1211 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1212 { 1213 struct ib_uverbs_device *uverbs_dev = client_data; 1214 int wait_clients = 1; 1215 1216 if (!uverbs_dev) 1217 return; 1218 1219 dev_set_drvdata(uverbs_dev->dev, NULL); 1220 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1221 cdev_del(&uverbs_dev->cdev); 1222 1223 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1224 clear_bit(uverbs_dev->devnum, dev_map); 1225 else 1226 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1227 1228 if (device->disassociate_ucontext) { 1229 /* We disassociate HW resources and immediately return. 1230 * Userspace will see a EIO errno for all future access. 1231 * Upon returning, ib_device may be freed internally and is not 1232 * valid any more. 1233 * uverbs_device is still available until all clients close 1234 * their files, then the uverbs device ref count will be zero 1235 * and its resources will be freed. 1236 * Note: At this point no more files can be opened since the 1237 * cdev was deleted, however active clients can still issue 1238 * commands and close their open files. 1239 */ 1240 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1241 ib_uverbs_free_hw_resources(uverbs_dev, device); 1242 wait_clients = 0; 1243 } 1244 1245 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1246 ib_uverbs_comp_dev(uverbs_dev); 1247 if (wait_clients) 1248 wait_for_completion(&uverbs_dev->comp); 1249 if (uverbs_dev->specs_root) { 1250 uverbs_free_spec_tree(uverbs_dev->specs_root); 1251 device->specs_root = NULL; 1252 } 1253 1254 kobject_put(&uverbs_dev->kobj); 1255 } 1256 1257 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1258 { 1259 if (mode) 1260 *mode = 0666; 1261 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1262 } 1263 1264 static int __init ib_uverbs_init(void) 1265 { 1266 int ret; 1267 1268 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1269 "infiniband_verbs"); 1270 if (ret) { 1271 pr_err("user_verbs: couldn't register device number\n"); 1272 goto out; 1273 } 1274 1275 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1276 if (IS_ERR(uverbs_class)) { 1277 ret = PTR_ERR(uverbs_class); 1278 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1279 goto out_chrdev; 1280 } 1281 1282 uverbs_class->devnode = uverbs_devnode; 1283 1284 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1285 if (ret) { 1286 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1287 goto out_class; 1288 } 1289 1290 ret = ib_register_client(&uverbs_client); 1291 if (ret) { 1292 pr_err("user_verbs: couldn't register client\n"); 1293 goto out_class; 1294 } 1295 1296 return 0; 1297 1298 out_class: 1299 class_destroy(uverbs_class); 1300 1301 out_chrdev: 1302 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1303 1304 out: 1305 return ret; 1306 } 1307 1308 static void __exit ib_uverbs_cleanup(void) 1309 { 1310 ib_unregister_client(&uverbs_client); 1311 class_destroy(uverbs_class); 1312 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1313 if (overflow_maj) 1314 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1315 } 1316 1317 module_init(ib_uverbs_init); 1318 module_exit(ib_uverbs_cleanup); 1319