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