1 /* 2 * Copyright (c) 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 6 * Copyright (c) 2005 PathScale, Inc. All rights reserved. 7 * 8 * This software is available to you under a choice of one of two 9 * licenses. You may choose to be licensed under the terms of the GNU 10 * General Public License (GPL) Version 2, available from the file 11 * COPYING in the main directory of this source tree, or the 12 * OpenIB.org BSD license below: 13 * 14 * Redistribution and use in source and binary forms, with or 15 * without modification, are permitted provided that the following 16 * conditions are met: 17 * 18 * - Redistributions of source code must retain the above 19 * copyright notice, this list of conditions and the following 20 * disclaimer. 21 * 22 * - Redistributions in binary form must reproduce the above 23 * copyright notice, this list of conditions and the following 24 * disclaimer in the documentation and/or other materials 25 * provided with the distribution. 26 * 27 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 28 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 29 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 30 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 31 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 32 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 33 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 34 * SOFTWARE. 35 */ 36 37 #include <linux/module.h> 38 #include <linux/init.h> 39 #include <linux/device.h> 40 #include <linux/err.h> 41 #include <linux/fs.h> 42 #include <linux/poll.h> 43 #include <linux/sched.h> 44 #include <linux/file.h> 45 #include <linux/cdev.h> 46 #include <linux/anon_inodes.h> 47 #include <linux/slab.h> 48 49 #include <asm/uaccess.h> 50 51 #include <rdma/ib.h> 52 53 #include "uverbs.h" 54 55 MODULE_AUTHOR("Roland Dreier"); 56 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 57 MODULE_LICENSE("Dual BSD/GPL"); 58 59 enum { 60 IB_UVERBS_MAJOR = 231, 61 IB_UVERBS_BASE_MINOR = 192, 62 IB_UVERBS_MAX_DEVICES = 32 63 }; 64 65 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 66 67 static struct class *uverbs_class; 68 69 DEFINE_SPINLOCK(ib_uverbs_idr_lock); 70 DEFINE_IDR(ib_uverbs_pd_idr); 71 DEFINE_IDR(ib_uverbs_mr_idr); 72 DEFINE_IDR(ib_uverbs_mw_idr); 73 DEFINE_IDR(ib_uverbs_ah_idr); 74 DEFINE_IDR(ib_uverbs_cq_idr); 75 DEFINE_IDR(ib_uverbs_qp_idr); 76 DEFINE_IDR(ib_uverbs_srq_idr); 77 DEFINE_IDR(ib_uverbs_xrcd_idr); 78 DEFINE_IDR(ib_uverbs_rule_idr); 79 80 static DEFINE_SPINLOCK(map_lock); 81 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 82 83 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 84 struct ib_device *ib_dev, 85 const char __user *buf, int in_len, 86 int out_len) = { 87 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 88 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 89 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 90 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 91 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 92 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 93 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 94 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 95 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 96 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 97 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 98 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 99 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 100 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 101 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 102 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 103 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 104 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 105 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 106 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 107 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 108 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 109 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 110 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 111 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 112 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 113 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 114 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 115 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 116 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 117 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 118 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 119 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 120 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 121 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 122 }; 123 124 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 125 struct ib_device *ib_dev, 126 struct ib_udata *ucore, 127 struct ib_udata *uhw) = { 128 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 129 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 130 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 131 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 132 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 133 }; 134 135 static void ib_uverbs_add_one(struct ib_device *device); 136 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 137 138 int uverbs_dealloc_mw(struct ib_mw *mw) 139 { 140 struct ib_pd *pd = mw->pd; 141 int ret; 142 143 ret = mw->device->dealloc_mw(mw); 144 if (!ret) 145 atomic_dec(&pd->usecnt); 146 return ret; 147 } 148 149 static void ib_uverbs_release_dev(struct kobject *kobj) 150 { 151 struct ib_uverbs_device *dev = 152 container_of(kobj, struct ib_uverbs_device, kobj); 153 154 cleanup_srcu_struct(&dev->disassociate_srcu); 155 kfree(dev); 156 } 157 158 static struct kobj_type ib_uverbs_dev_ktype = { 159 .release = ib_uverbs_release_dev, 160 }; 161 162 static void ib_uverbs_release_event_file(struct kref *ref) 163 { 164 struct ib_uverbs_event_file *file = 165 container_of(ref, struct ib_uverbs_event_file, ref); 166 167 kfree(file); 168 } 169 170 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 171 struct ib_uverbs_event_file *ev_file, 172 struct ib_ucq_object *uobj) 173 { 174 struct ib_uverbs_event *evt, *tmp; 175 176 if (ev_file) { 177 spin_lock_irq(&ev_file->lock); 178 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 179 list_del(&evt->list); 180 kfree(evt); 181 } 182 spin_unlock_irq(&ev_file->lock); 183 184 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 185 } 186 187 spin_lock_irq(&file->async_file->lock); 188 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 189 list_del(&evt->list); 190 kfree(evt); 191 } 192 spin_unlock_irq(&file->async_file->lock); 193 } 194 195 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 196 struct ib_uevent_object *uobj) 197 { 198 struct ib_uverbs_event *evt, *tmp; 199 200 spin_lock_irq(&file->async_file->lock); 201 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 202 list_del(&evt->list); 203 kfree(evt); 204 } 205 spin_unlock_irq(&file->async_file->lock); 206 } 207 208 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 209 struct ib_uqp_object *uobj) 210 { 211 struct ib_uverbs_mcast_entry *mcast, *tmp; 212 213 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 214 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 215 list_del(&mcast->list); 216 kfree(mcast); 217 } 218 } 219 220 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 221 struct ib_ucontext *context) 222 { 223 struct ib_uobject *uobj, *tmp; 224 225 context->closing = 1; 226 227 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 228 struct ib_ah *ah = uobj->object; 229 230 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 231 ib_destroy_ah(ah); 232 kfree(uobj); 233 } 234 235 /* Remove MWs before QPs, in order to support type 2A MWs. */ 236 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { 237 struct ib_mw *mw = uobj->object; 238 239 idr_remove_uobj(&ib_uverbs_mw_idr, uobj); 240 uverbs_dealloc_mw(mw); 241 kfree(uobj); 242 } 243 244 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { 245 struct ib_flow *flow_id = uobj->object; 246 247 idr_remove_uobj(&ib_uverbs_rule_idr, uobj); 248 ib_destroy_flow(flow_id); 249 kfree(uobj); 250 } 251 252 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 253 struct ib_qp *qp = uobj->object; 254 struct ib_uqp_object *uqp = 255 container_of(uobj, struct ib_uqp_object, uevent.uobject); 256 257 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 258 if (qp != qp->real_qp) { 259 ib_close_qp(qp); 260 } else { 261 ib_uverbs_detach_umcast(qp, uqp); 262 ib_destroy_qp(qp); 263 } 264 ib_uverbs_release_uevent(file, &uqp->uevent); 265 kfree(uqp); 266 } 267 268 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 269 struct ib_srq *srq = uobj->object; 270 struct ib_uevent_object *uevent = 271 container_of(uobj, struct ib_uevent_object, uobject); 272 273 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 274 ib_destroy_srq(srq); 275 ib_uverbs_release_uevent(file, uevent); 276 kfree(uevent); 277 } 278 279 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 280 struct ib_cq *cq = uobj->object; 281 struct ib_uverbs_event_file *ev_file = cq->cq_context; 282 struct ib_ucq_object *ucq = 283 container_of(uobj, struct ib_ucq_object, uobject); 284 285 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 286 ib_destroy_cq(cq); 287 ib_uverbs_release_ucq(file, ev_file, ucq); 288 kfree(ucq); 289 } 290 291 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 292 struct ib_mr *mr = uobj->object; 293 294 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 295 ib_dereg_mr(mr); 296 kfree(uobj); 297 } 298 299 mutex_lock(&file->device->xrcd_tree_mutex); 300 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 301 struct ib_xrcd *xrcd = uobj->object; 302 struct ib_uxrcd_object *uxrcd = 303 container_of(uobj, struct ib_uxrcd_object, uobject); 304 305 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 306 ib_uverbs_dealloc_xrcd(file->device, xrcd); 307 kfree(uxrcd); 308 } 309 mutex_unlock(&file->device->xrcd_tree_mutex); 310 311 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 312 struct ib_pd *pd = uobj->object; 313 314 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 315 ib_dealloc_pd(pd); 316 kfree(uobj); 317 } 318 319 put_pid(context->tgid); 320 321 return context->device->dealloc_ucontext(context); 322 } 323 324 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 325 { 326 complete(&dev->comp); 327 } 328 329 static void ib_uverbs_release_file(struct kref *ref) 330 { 331 struct ib_uverbs_file *file = 332 container_of(ref, struct ib_uverbs_file, ref); 333 struct ib_device *ib_dev; 334 int srcu_key; 335 336 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 337 ib_dev = srcu_dereference(file->device->ib_dev, 338 &file->device->disassociate_srcu); 339 if (ib_dev && !ib_dev->disassociate_ucontext) 340 module_put(ib_dev->owner); 341 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 342 343 if (atomic_dec_and_test(&file->device->refcount)) 344 ib_uverbs_comp_dev(file->device); 345 346 kfree(file); 347 } 348 349 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 350 size_t count, loff_t *pos) 351 { 352 struct ib_uverbs_event_file *file = filp->private_data; 353 struct ib_uverbs_event *event; 354 int eventsz; 355 int ret = 0; 356 357 spin_lock_irq(&file->lock); 358 359 while (list_empty(&file->event_list)) { 360 spin_unlock_irq(&file->lock); 361 362 if (filp->f_flags & O_NONBLOCK) 363 return -EAGAIN; 364 365 if (wait_event_interruptible(file->poll_wait, 366 (!list_empty(&file->event_list) || 367 /* The barriers built into wait_event_interruptible() 368 * and wake_up() guarentee this will see the null set 369 * without using RCU 370 */ 371 !file->uverbs_file->device->ib_dev))) 372 return -ERESTARTSYS; 373 374 /* If device was disassociated and no event exists set an error */ 375 if (list_empty(&file->event_list) && 376 !file->uverbs_file->device->ib_dev) 377 return -EIO; 378 379 spin_lock_irq(&file->lock); 380 } 381 382 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 383 384 if (file->is_async) 385 eventsz = sizeof (struct ib_uverbs_async_event_desc); 386 else 387 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 388 389 if (eventsz > count) { 390 ret = -EINVAL; 391 event = NULL; 392 } else { 393 list_del(file->event_list.next); 394 if (event->counter) { 395 ++(*event->counter); 396 list_del(&event->obj_list); 397 } 398 } 399 400 spin_unlock_irq(&file->lock); 401 402 if (event) { 403 if (copy_to_user(buf, event, eventsz)) 404 ret = -EFAULT; 405 else 406 ret = eventsz; 407 } 408 409 kfree(event); 410 411 return ret; 412 } 413 414 static unsigned int ib_uverbs_event_poll(struct file *filp, 415 struct poll_table_struct *wait) 416 { 417 unsigned int pollflags = 0; 418 struct ib_uverbs_event_file *file = filp->private_data; 419 420 poll_wait(filp, &file->poll_wait, wait); 421 422 spin_lock_irq(&file->lock); 423 if (!list_empty(&file->event_list)) 424 pollflags = POLLIN | POLLRDNORM; 425 spin_unlock_irq(&file->lock); 426 427 return pollflags; 428 } 429 430 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 431 { 432 struct ib_uverbs_event_file *file = filp->private_data; 433 434 return fasync_helper(fd, filp, on, &file->async_queue); 435 } 436 437 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 438 { 439 struct ib_uverbs_event_file *file = filp->private_data; 440 struct ib_uverbs_event *entry, *tmp; 441 int closed_already = 0; 442 443 mutex_lock(&file->uverbs_file->device->lists_mutex); 444 spin_lock_irq(&file->lock); 445 closed_already = file->is_closed; 446 file->is_closed = 1; 447 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 448 if (entry->counter) 449 list_del(&entry->obj_list); 450 kfree(entry); 451 } 452 spin_unlock_irq(&file->lock); 453 if (!closed_already) { 454 list_del(&file->list); 455 if (file->is_async) 456 ib_unregister_event_handler(&file->uverbs_file-> 457 event_handler); 458 } 459 mutex_unlock(&file->uverbs_file->device->lists_mutex); 460 461 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 462 kref_put(&file->ref, ib_uverbs_release_event_file); 463 464 return 0; 465 } 466 467 static const struct file_operations uverbs_event_fops = { 468 .owner = THIS_MODULE, 469 .read = ib_uverbs_event_read, 470 .poll = ib_uverbs_event_poll, 471 .release = ib_uverbs_event_close, 472 .fasync = ib_uverbs_event_fasync, 473 .llseek = no_llseek, 474 }; 475 476 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 477 { 478 struct ib_uverbs_event_file *file = cq_context; 479 struct ib_ucq_object *uobj; 480 struct ib_uverbs_event *entry; 481 unsigned long flags; 482 483 if (!file) 484 return; 485 486 spin_lock_irqsave(&file->lock, flags); 487 if (file->is_closed) { 488 spin_unlock_irqrestore(&file->lock, flags); 489 return; 490 } 491 492 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 493 if (!entry) { 494 spin_unlock_irqrestore(&file->lock, flags); 495 return; 496 } 497 498 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 499 500 entry->desc.comp.cq_handle = cq->uobject->user_handle; 501 entry->counter = &uobj->comp_events_reported; 502 503 list_add_tail(&entry->list, &file->event_list); 504 list_add_tail(&entry->obj_list, &uobj->comp_list); 505 spin_unlock_irqrestore(&file->lock, flags); 506 507 wake_up_interruptible(&file->poll_wait); 508 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 509 } 510 511 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 512 __u64 element, __u64 event, 513 struct list_head *obj_list, 514 u32 *counter) 515 { 516 struct ib_uverbs_event *entry; 517 unsigned long flags; 518 519 spin_lock_irqsave(&file->async_file->lock, flags); 520 if (file->async_file->is_closed) { 521 spin_unlock_irqrestore(&file->async_file->lock, flags); 522 return; 523 } 524 525 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 526 if (!entry) { 527 spin_unlock_irqrestore(&file->async_file->lock, flags); 528 return; 529 } 530 531 entry->desc.async.element = element; 532 entry->desc.async.event_type = event; 533 entry->desc.async.reserved = 0; 534 entry->counter = counter; 535 536 list_add_tail(&entry->list, &file->async_file->event_list); 537 if (obj_list) 538 list_add_tail(&entry->obj_list, obj_list); 539 spin_unlock_irqrestore(&file->async_file->lock, flags); 540 541 wake_up_interruptible(&file->async_file->poll_wait); 542 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 543 } 544 545 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 546 { 547 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 548 struct ib_ucq_object, uobject); 549 550 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 551 event->event, &uobj->async_list, 552 &uobj->async_events_reported); 553 } 554 555 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 556 { 557 struct ib_uevent_object *uobj; 558 559 /* for XRC target qp's, check that qp is live */ 560 if (!event->element.qp->uobject || !event->element.qp->uobject->live) 561 return; 562 563 uobj = container_of(event->element.qp->uobject, 564 struct ib_uevent_object, uobject); 565 566 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 567 event->event, &uobj->event_list, 568 &uobj->events_reported); 569 } 570 571 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 572 { 573 struct ib_uevent_object *uobj; 574 575 uobj = container_of(event->element.srq->uobject, 576 struct ib_uevent_object, uobject); 577 578 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 579 event->event, &uobj->event_list, 580 &uobj->events_reported); 581 } 582 583 void ib_uverbs_event_handler(struct ib_event_handler *handler, 584 struct ib_event *event) 585 { 586 struct ib_uverbs_file *file = 587 container_of(handler, struct ib_uverbs_file, event_handler); 588 589 ib_uverbs_async_handler(file, event->element.port_num, event->event, 590 NULL, NULL); 591 } 592 593 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 594 { 595 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 596 file->async_file = NULL; 597 } 598 599 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 600 struct ib_device *ib_dev, 601 int is_async) 602 { 603 struct ib_uverbs_event_file *ev_file; 604 struct file *filp; 605 int ret; 606 607 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 608 if (!ev_file) 609 return ERR_PTR(-ENOMEM); 610 611 kref_init(&ev_file->ref); 612 spin_lock_init(&ev_file->lock); 613 INIT_LIST_HEAD(&ev_file->event_list); 614 init_waitqueue_head(&ev_file->poll_wait); 615 ev_file->uverbs_file = uverbs_file; 616 kref_get(&ev_file->uverbs_file->ref); 617 ev_file->async_queue = NULL; 618 ev_file->is_closed = 0; 619 620 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 621 ev_file, O_RDONLY); 622 if (IS_ERR(filp)) 623 goto err_put_refs; 624 625 mutex_lock(&uverbs_file->device->lists_mutex); 626 list_add_tail(&ev_file->list, 627 &uverbs_file->device->uverbs_events_file_list); 628 mutex_unlock(&uverbs_file->device->lists_mutex); 629 630 if (is_async) { 631 WARN_ON(uverbs_file->async_file); 632 uverbs_file->async_file = ev_file; 633 kref_get(&uverbs_file->async_file->ref); 634 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 635 ib_dev, 636 ib_uverbs_event_handler); 637 ret = ib_register_event_handler(&uverbs_file->event_handler); 638 if (ret) 639 goto err_put_file; 640 641 /* At that point async file stuff was fully set */ 642 ev_file->is_async = 1; 643 } 644 645 return filp; 646 647 err_put_file: 648 fput(filp); 649 kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file); 650 uverbs_file->async_file = NULL; 651 return ERR_PTR(ret); 652 653 err_put_refs: 654 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 655 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 656 return filp; 657 } 658 659 /* 660 * Look up a completion event file by FD. If lookup is successful, 661 * takes a ref to the event file struct that it returns; if 662 * unsuccessful, returns NULL. 663 */ 664 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 665 { 666 struct ib_uverbs_event_file *ev_file = NULL; 667 struct fd f = fdget(fd); 668 669 if (!f.file) 670 return NULL; 671 672 if (f.file->f_op != &uverbs_event_fops) 673 goto out; 674 675 ev_file = f.file->private_data; 676 if (ev_file->is_async) { 677 ev_file = NULL; 678 goto out; 679 } 680 681 kref_get(&ev_file->ref); 682 683 out: 684 fdput(f); 685 return ev_file; 686 } 687 688 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 689 { 690 u64 mask; 691 692 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 693 mask = ib_dev->uverbs_cmd_mask; 694 else 695 mask = ib_dev->uverbs_ex_cmd_mask; 696 697 if (mask & ((u64)1 << command)) 698 return 0; 699 700 return -1; 701 } 702 703 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 704 size_t count, loff_t *pos) 705 { 706 struct ib_uverbs_file *file = filp->private_data; 707 struct ib_device *ib_dev; 708 struct ib_uverbs_cmd_hdr hdr; 709 __u32 command; 710 __u32 flags; 711 int srcu_key; 712 ssize_t ret; 713 714 if (WARN_ON_ONCE(!ib_safe_file_access(filp))) 715 return -EACCES; 716 717 if (count < sizeof hdr) 718 return -EINVAL; 719 720 if (copy_from_user(&hdr, buf, sizeof hdr)) 721 return -EFAULT; 722 723 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 724 ib_dev = srcu_dereference(file->device->ib_dev, 725 &file->device->disassociate_srcu); 726 if (!ib_dev) { 727 ret = -EIO; 728 goto out; 729 } 730 731 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 732 IB_USER_VERBS_CMD_COMMAND_MASK)) { 733 ret = -EINVAL; 734 goto out; 735 } 736 737 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 738 if (verify_command_mask(ib_dev, command)) { 739 ret = -EOPNOTSUPP; 740 goto out; 741 } 742 743 if (!file->ucontext && 744 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 745 ret = -EINVAL; 746 goto out; 747 } 748 749 flags = (hdr.command & 750 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 751 752 if (!flags) { 753 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 754 !uverbs_cmd_table[command]) { 755 ret = -EINVAL; 756 goto out; 757 } 758 759 if (hdr.in_words * 4 != count) { 760 ret = -EINVAL; 761 goto out; 762 } 763 764 ret = uverbs_cmd_table[command](file, ib_dev, 765 buf + sizeof(hdr), 766 hdr.in_words * 4, 767 hdr.out_words * 4); 768 769 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 770 struct ib_uverbs_ex_cmd_hdr ex_hdr; 771 struct ib_udata ucore; 772 struct ib_udata uhw; 773 size_t written_count = count; 774 775 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 776 !uverbs_ex_cmd_table[command]) { 777 ret = -ENOSYS; 778 goto out; 779 } 780 781 if (!file->ucontext) { 782 ret = -EINVAL; 783 goto out; 784 } 785 786 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 787 ret = -EINVAL; 788 goto out; 789 } 790 791 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 792 ret = -EFAULT; 793 goto out; 794 } 795 796 count -= sizeof(hdr) + sizeof(ex_hdr); 797 buf += sizeof(hdr) + sizeof(ex_hdr); 798 799 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 800 ret = -EINVAL; 801 goto out; 802 } 803 804 if (ex_hdr.cmd_hdr_reserved) { 805 ret = -EINVAL; 806 goto out; 807 } 808 809 if (ex_hdr.response) { 810 if (!hdr.out_words && !ex_hdr.provider_out_words) { 811 ret = -EINVAL; 812 goto out; 813 } 814 815 if (!access_ok(VERIFY_WRITE, 816 (void __user *) (unsigned long) ex_hdr.response, 817 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 818 ret = -EFAULT; 819 goto out; 820 } 821 } else { 822 if (hdr.out_words || ex_hdr.provider_out_words) { 823 ret = -EINVAL; 824 goto out; 825 } 826 } 827 828 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, 829 hdr.in_words * 8, hdr.out_words * 8); 830 831 INIT_UDATA_BUF_OR_NULL(&uhw, 832 buf + ucore.inlen, 833 (unsigned long) ex_hdr.response + ucore.outlen, 834 ex_hdr.provider_in_words * 8, 835 ex_hdr.provider_out_words * 8); 836 837 ret = uverbs_ex_cmd_table[command](file, 838 ib_dev, 839 &ucore, 840 &uhw); 841 if (!ret) 842 ret = written_count; 843 } else { 844 ret = -ENOSYS; 845 } 846 847 out: 848 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 849 return ret; 850 } 851 852 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 853 { 854 struct ib_uverbs_file *file = filp->private_data; 855 struct ib_device *ib_dev; 856 int ret = 0; 857 int srcu_key; 858 859 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 860 ib_dev = srcu_dereference(file->device->ib_dev, 861 &file->device->disassociate_srcu); 862 if (!ib_dev) { 863 ret = -EIO; 864 goto out; 865 } 866 867 if (!file->ucontext) 868 ret = -ENODEV; 869 else 870 ret = ib_dev->mmap(file->ucontext, vma); 871 out: 872 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 873 return ret; 874 } 875 876 /* 877 * ib_uverbs_open() does not need the BKL: 878 * 879 * - the ib_uverbs_device structures are properly reference counted and 880 * everything else is purely local to the file being created, so 881 * races against other open calls are not a problem; 882 * - there is no ioctl method to race against; 883 * - the open method will either immediately run -ENXIO, or all 884 * required initialization will be done. 885 */ 886 static int ib_uverbs_open(struct inode *inode, struct file *filp) 887 { 888 struct ib_uverbs_device *dev; 889 struct ib_uverbs_file *file; 890 struct ib_device *ib_dev; 891 int ret; 892 int module_dependent; 893 int srcu_key; 894 895 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 896 if (!atomic_inc_not_zero(&dev->refcount)) 897 return -ENXIO; 898 899 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 900 mutex_lock(&dev->lists_mutex); 901 ib_dev = srcu_dereference(dev->ib_dev, 902 &dev->disassociate_srcu); 903 if (!ib_dev) { 904 ret = -EIO; 905 goto err; 906 } 907 908 /* In case IB device supports disassociate ucontext, there is no hard 909 * dependency between uverbs device and its low level device. 910 */ 911 module_dependent = !(ib_dev->disassociate_ucontext); 912 913 if (module_dependent) { 914 if (!try_module_get(ib_dev->owner)) { 915 ret = -ENODEV; 916 goto err; 917 } 918 } 919 920 file = kzalloc(sizeof(*file), GFP_KERNEL); 921 if (!file) { 922 ret = -ENOMEM; 923 if (module_dependent) 924 goto err_module; 925 926 goto err; 927 } 928 929 file->device = dev; 930 file->ucontext = NULL; 931 file->async_file = NULL; 932 kref_init(&file->ref); 933 mutex_init(&file->mutex); 934 935 filp->private_data = file; 936 kobject_get(&dev->kobj); 937 list_add_tail(&file->list, &dev->uverbs_file_list); 938 mutex_unlock(&dev->lists_mutex); 939 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 940 941 return nonseekable_open(inode, filp); 942 943 err_module: 944 module_put(ib_dev->owner); 945 946 err: 947 mutex_unlock(&dev->lists_mutex); 948 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 949 if (atomic_dec_and_test(&dev->refcount)) 950 ib_uverbs_comp_dev(dev); 951 952 return ret; 953 } 954 955 static int ib_uverbs_close(struct inode *inode, struct file *filp) 956 { 957 struct ib_uverbs_file *file = filp->private_data; 958 struct ib_uverbs_device *dev = file->device; 959 struct ib_ucontext *ucontext = NULL; 960 961 mutex_lock(&file->device->lists_mutex); 962 ucontext = file->ucontext; 963 file->ucontext = NULL; 964 if (!file->is_closed) { 965 list_del(&file->list); 966 file->is_closed = 1; 967 } 968 mutex_unlock(&file->device->lists_mutex); 969 if (ucontext) 970 ib_uverbs_cleanup_ucontext(file, ucontext); 971 972 if (file->async_file) 973 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 974 975 kref_put(&file->ref, ib_uverbs_release_file); 976 kobject_put(&dev->kobj); 977 978 return 0; 979 } 980 981 static const struct file_operations uverbs_fops = { 982 .owner = THIS_MODULE, 983 .write = ib_uverbs_write, 984 .open = ib_uverbs_open, 985 .release = ib_uverbs_close, 986 .llseek = no_llseek, 987 }; 988 989 static const struct file_operations uverbs_mmap_fops = { 990 .owner = THIS_MODULE, 991 .write = ib_uverbs_write, 992 .mmap = ib_uverbs_mmap, 993 .open = ib_uverbs_open, 994 .release = ib_uverbs_close, 995 .llseek = no_llseek, 996 }; 997 998 static struct ib_client uverbs_client = { 999 .name = "uverbs", 1000 .add = ib_uverbs_add_one, 1001 .remove = ib_uverbs_remove_one 1002 }; 1003 1004 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 1005 char *buf) 1006 { 1007 int ret = -ENODEV; 1008 int srcu_key; 1009 struct ib_uverbs_device *dev = dev_get_drvdata(device); 1010 struct ib_device *ib_dev; 1011 1012 if (!dev) 1013 return -ENODEV; 1014 1015 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1016 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1017 if (ib_dev) 1018 ret = sprintf(buf, "%s\n", ib_dev->name); 1019 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1020 1021 return ret; 1022 } 1023 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 1024 1025 static ssize_t show_dev_abi_version(struct device *device, 1026 struct device_attribute *attr, char *buf) 1027 { 1028 struct ib_uverbs_device *dev = dev_get_drvdata(device); 1029 int ret = -ENODEV; 1030 int srcu_key; 1031 struct ib_device *ib_dev; 1032 1033 if (!dev) 1034 return -ENODEV; 1035 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1036 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1037 if (ib_dev) 1038 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 1039 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1040 1041 return ret; 1042 } 1043 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1044 1045 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1046 __stringify(IB_USER_VERBS_ABI_VERSION)); 1047 1048 static dev_t overflow_maj; 1049 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1050 1051 /* 1052 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1053 * requesting a new major number and doubling the number of max devices we 1054 * support. It's stupid, but simple. 1055 */ 1056 static int find_overflow_devnum(void) 1057 { 1058 int ret; 1059 1060 if (!overflow_maj) { 1061 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1062 "infiniband_verbs"); 1063 if (ret) { 1064 pr_err("user_verbs: couldn't register dynamic device number\n"); 1065 return ret; 1066 } 1067 } 1068 1069 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1070 if (ret >= IB_UVERBS_MAX_DEVICES) 1071 return -1; 1072 1073 return ret; 1074 } 1075 1076 static void ib_uverbs_add_one(struct ib_device *device) 1077 { 1078 int devnum; 1079 dev_t base; 1080 struct ib_uverbs_device *uverbs_dev; 1081 int ret; 1082 1083 if (!device->alloc_ucontext) 1084 return; 1085 1086 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1087 if (!uverbs_dev) 1088 return; 1089 1090 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1091 if (ret) { 1092 kfree(uverbs_dev); 1093 return; 1094 } 1095 1096 atomic_set(&uverbs_dev->refcount, 1); 1097 init_completion(&uverbs_dev->comp); 1098 uverbs_dev->xrcd_tree = RB_ROOT; 1099 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1100 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1101 mutex_init(&uverbs_dev->lists_mutex); 1102 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1103 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1104 1105 spin_lock(&map_lock); 1106 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1107 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1108 spin_unlock(&map_lock); 1109 devnum = find_overflow_devnum(); 1110 if (devnum < 0) 1111 goto err; 1112 1113 spin_lock(&map_lock); 1114 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1115 base = devnum + overflow_maj; 1116 set_bit(devnum, overflow_map); 1117 } else { 1118 uverbs_dev->devnum = devnum; 1119 base = devnum + IB_UVERBS_BASE_DEV; 1120 set_bit(devnum, dev_map); 1121 } 1122 spin_unlock(&map_lock); 1123 1124 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1125 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1126 1127 cdev_init(&uverbs_dev->cdev, NULL); 1128 uverbs_dev->cdev.owner = THIS_MODULE; 1129 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1130 uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj; 1131 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1132 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1133 goto err_cdev; 1134 1135 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 1136 uverbs_dev->cdev.dev, uverbs_dev, 1137 "uverbs%d", uverbs_dev->devnum); 1138 if (IS_ERR(uverbs_dev->dev)) 1139 goto err_cdev; 1140 1141 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1142 goto err_class; 1143 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1144 goto err_class; 1145 1146 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1147 1148 return; 1149 1150 err_class: 1151 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1152 1153 err_cdev: 1154 cdev_del(&uverbs_dev->cdev); 1155 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1156 clear_bit(devnum, dev_map); 1157 else 1158 clear_bit(devnum, overflow_map); 1159 1160 err: 1161 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1162 ib_uverbs_comp_dev(uverbs_dev); 1163 wait_for_completion(&uverbs_dev->comp); 1164 kobject_put(&uverbs_dev->kobj); 1165 return; 1166 } 1167 1168 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1169 struct ib_device *ib_dev) 1170 { 1171 struct ib_uverbs_file *file; 1172 struct ib_uverbs_event_file *event_file; 1173 struct ib_event event; 1174 1175 /* Pending running commands to terminate */ 1176 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1177 event.event = IB_EVENT_DEVICE_FATAL; 1178 event.element.port_num = 0; 1179 event.device = ib_dev; 1180 1181 mutex_lock(&uverbs_dev->lists_mutex); 1182 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1183 struct ib_ucontext *ucontext; 1184 1185 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1186 struct ib_uverbs_file, list); 1187 file->is_closed = 1; 1188 ucontext = file->ucontext; 1189 list_del(&file->list); 1190 file->ucontext = NULL; 1191 kref_get(&file->ref); 1192 mutex_unlock(&uverbs_dev->lists_mutex); 1193 /* We must release the mutex before going ahead and calling 1194 * disassociate_ucontext. disassociate_ucontext might end up 1195 * indirectly calling uverbs_close, for example due to freeing 1196 * the resources (e.g mmput). 1197 */ 1198 ib_uverbs_event_handler(&file->event_handler, &event); 1199 if (ucontext) { 1200 ib_dev->disassociate_ucontext(ucontext); 1201 ib_uverbs_cleanup_ucontext(file, ucontext); 1202 } 1203 1204 mutex_lock(&uverbs_dev->lists_mutex); 1205 kref_put(&file->ref, ib_uverbs_release_file); 1206 } 1207 1208 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1209 event_file = list_first_entry(&uverbs_dev-> 1210 uverbs_events_file_list, 1211 struct ib_uverbs_event_file, 1212 list); 1213 spin_lock_irq(&event_file->lock); 1214 event_file->is_closed = 1; 1215 spin_unlock_irq(&event_file->lock); 1216 1217 list_del(&event_file->list); 1218 if (event_file->is_async) { 1219 ib_unregister_event_handler(&event_file->uverbs_file-> 1220 event_handler); 1221 event_file->uverbs_file->event_handler.device = NULL; 1222 } 1223 1224 wake_up_interruptible(&event_file->poll_wait); 1225 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN); 1226 } 1227 mutex_unlock(&uverbs_dev->lists_mutex); 1228 } 1229 1230 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1231 { 1232 struct ib_uverbs_device *uverbs_dev = client_data; 1233 int wait_clients = 1; 1234 1235 if (!uverbs_dev) 1236 return; 1237 1238 dev_set_drvdata(uverbs_dev->dev, NULL); 1239 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1240 cdev_del(&uverbs_dev->cdev); 1241 1242 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1243 clear_bit(uverbs_dev->devnum, dev_map); 1244 else 1245 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1246 1247 if (device->disassociate_ucontext) { 1248 /* We disassociate HW resources and immediately return. 1249 * Userspace will see a EIO errno for all future access. 1250 * Upon returning, ib_device may be freed internally and is not 1251 * valid any more. 1252 * uverbs_device is still available until all clients close 1253 * their files, then the uverbs device ref count will be zero 1254 * and its resources will be freed. 1255 * Note: At this point no more files can be opened since the 1256 * cdev was deleted, however active clients can still issue 1257 * commands and close their open files. 1258 */ 1259 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1260 ib_uverbs_free_hw_resources(uverbs_dev, device); 1261 wait_clients = 0; 1262 } 1263 1264 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1265 ib_uverbs_comp_dev(uverbs_dev); 1266 if (wait_clients) 1267 wait_for_completion(&uverbs_dev->comp); 1268 kobject_put(&uverbs_dev->kobj); 1269 } 1270 1271 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1272 { 1273 if (mode) 1274 *mode = 0666; 1275 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1276 } 1277 1278 static int __init ib_uverbs_init(void) 1279 { 1280 int ret; 1281 1282 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1283 "infiniband_verbs"); 1284 if (ret) { 1285 pr_err("user_verbs: couldn't register device number\n"); 1286 goto out; 1287 } 1288 1289 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1290 if (IS_ERR(uverbs_class)) { 1291 ret = PTR_ERR(uverbs_class); 1292 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1293 goto out_chrdev; 1294 } 1295 1296 uverbs_class->devnode = uverbs_devnode; 1297 1298 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1299 if (ret) { 1300 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1301 goto out_class; 1302 } 1303 1304 ret = ib_register_client(&uverbs_client); 1305 if (ret) { 1306 pr_err("user_verbs: couldn't register client\n"); 1307 goto out_class; 1308 } 1309 1310 return 0; 1311 1312 out_class: 1313 class_destroy(uverbs_class); 1314 1315 out_chrdev: 1316 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1317 1318 out: 1319 return ret; 1320 } 1321 1322 static void __exit ib_uverbs_cleanup(void) 1323 { 1324 ib_unregister_client(&uverbs_client); 1325 class_destroy(uverbs_class); 1326 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1327 if (overflow_maj) 1328 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1329 idr_destroy(&ib_uverbs_pd_idr); 1330 idr_destroy(&ib_uverbs_mr_idr); 1331 idr_destroy(&ib_uverbs_mw_idr); 1332 idr_destroy(&ib_uverbs_ah_idr); 1333 idr_destroy(&ib_uverbs_cq_idr); 1334 idr_destroy(&ib_uverbs_qp_idr); 1335 idr_destroy(&ib_uverbs_srq_idr); 1336 } 1337 1338 module_init(ib_uverbs_init); 1339 module_exit(ib_uverbs_cleanup); 1340