1 /* 2 * Copyright (c) 2005 Topspin Communications. All rights reserved. 3 * Copyright (c) 2005 Cisco Systems. All rights reserved. 4 * Copyright (c) 2005 Mellanox Technologies. All rights reserved. 5 * Copyright (c) 2005 Voltaire, Inc. All rights reserved. 6 * 7 * This software is available to you under a choice of one of two 8 * licenses. You may choose to be licensed under the terms of the GNU 9 * General Public License (GPL) Version 2, available from the file 10 * COPYING in the main directory of this source tree, or the 11 * OpenIB.org BSD license below: 12 * 13 * Redistribution and use in source and binary forms, with or 14 * without modification, are permitted provided that the following 15 * conditions are met: 16 * 17 * - Redistributions of source code must retain the above 18 * copyright notice, this list of conditions and the following 19 * disclaimer. 20 * 21 * - Redistributions in binary form must reproduce the above 22 * copyright notice, this list of conditions and the following 23 * disclaimer in the documentation and/or other materials 24 * provided with the distribution. 25 * 26 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, 27 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF 28 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND 29 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS 30 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN 31 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN 32 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE 33 * SOFTWARE. 34 * 35 * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $ 36 */ 37 38 #include <linux/module.h> 39 #include <linux/init.h> 40 #include <linux/device.h> 41 #include <linux/err.h> 42 #include <linux/fs.h> 43 #include <linux/poll.h> 44 #include <linux/file.h> 45 #include <linux/mount.h> 46 47 #include <asm/uaccess.h> 48 49 #include "uverbs.h" 50 51 MODULE_AUTHOR("Roland Dreier"); 52 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 53 MODULE_LICENSE("Dual BSD/GPL"); 54 55 #define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */ 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 DECLARE_MUTEX(ib_uverbs_idr_mutex); 66 DEFINE_IDR(ib_uverbs_pd_idr); 67 DEFINE_IDR(ib_uverbs_mr_idr); 68 DEFINE_IDR(ib_uverbs_mw_idr); 69 DEFINE_IDR(ib_uverbs_ah_idr); 70 DEFINE_IDR(ib_uverbs_cq_idr); 71 DEFINE_IDR(ib_uverbs_qp_idr); 72 DEFINE_IDR(ib_uverbs_srq_idr); 73 74 static spinlock_t map_lock; 75 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 76 77 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 78 const char __user *buf, int in_len, 79 int out_len) = { 80 [IB_USER_VERBS_CMD_QUERY_PARAMS] = ib_uverbs_query_params, 81 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 82 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 83 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 84 [IB_USER_VERBS_CMD_QUERY_GID] = ib_uverbs_query_gid, 85 [IB_USER_VERBS_CMD_QUERY_PKEY] = ib_uverbs_query_pkey, 86 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 87 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 88 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 89 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 90 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 91 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 92 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 93 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 94 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 95 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 96 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 97 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 98 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 99 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 100 }; 101 102 static struct vfsmount *uverbs_event_mnt; 103 104 static void ib_uverbs_add_one(struct ib_device *device); 105 static void ib_uverbs_remove_one(struct ib_device *device); 106 107 static int ib_dealloc_ucontext(struct ib_ucontext *context) 108 { 109 struct ib_uobject *uobj, *tmp; 110 111 if (!context) 112 return 0; 113 114 down(&ib_uverbs_idr_mutex); 115 116 /* XXX Free AHs */ 117 118 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 119 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); 120 idr_remove(&ib_uverbs_qp_idr, uobj->id); 121 ib_destroy_qp(qp); 122 list_del(&uobj->list); 123 kfree(container_of(uobj, struct ib_uevent_object, uobject)); 124 } 125 126 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 127 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); 128 idr_remove(&ib_uverbs_cq_idr, uobj->id); 129 ib_destroy_cq(cq); 130 list_del(&uobj->list); 131 kfree(container_of(uobj, struct ib_ucq_object, uobject)); 132 } 133 134 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 135 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id); 136 idr_remove(&ib_uverbs_srq_idr, uobj->id); 137 ib_destroy_srq(srq); 138 list_del(&uobj->list); 139 kfree(container_of(uobj, struct ib_uevent_object, uobject)); 140 } 141 142 /* XXX Free MWs */ 143 144 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 145 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); 146 struct ib_device *mrdev = mr->device; 147 struct ib_umem_object *memobj; 148 149 idr_remove(&ib_uverbs_mr_idr, uobj->id); 150 ib_dereg_mr(mr); 151 152 memobj = container_of(uobj, struct ib_umem_object, uobject); 153 ib_umem_release_on_close(mrdev, &memobj->umem); 154 155 list_del(&uobj->list); 156 kfree(memobj); 157 } 158 159 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 160 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); 161 idr_remove(&ib_uverbs_pd_idr, uobj->id); 162 ib_dealloc_pd(pd); 163 list_del(&uobj->list); 164 kfree(uobj); 165 } 166 167 up(&ib_uverbs_idr_mutex); 168 169 return context->device->dealloc_ucontext(context); 170 } 171 172 static void ib_uverbs_release_file(struct kref *ref) 173 { 174 struct ib_uverbs_file *file = 175 container_of(ref, struct ib_uverbs_file, ref); 176 177 module_put(file->device->ib_dev->owner); 178 kfree(file); 179 } 180 181 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 182 size_t count, loff_t *pos) 183 { 184 struct ib_uverbs_event_file *file = filp->private_data; 185 struct ib_uverbs_event *event; 186 int eventsz; 187 int ret = 0; 188 189 spin_lock_irq(&file->lock); 190 191 while (list_empty(&file->event_list) && file->fd >= 0) { 192 spin_unlock_irq(&file->lock); 193 194 if (filp->f_flags & O_NONBLOCK) 195 return -EAGAIN; 196 197 if (wait_event_interruptible(file->poll_wait, 198 !list_empty(&file->event_list) || 199 file->fd < 0)) 200 return -ERESTARTSYS; 201 202 spin_lock_irq(&file->lock); 203 } 204 205 if (file->fd < 0) { 206 spin_unlock_irq(&file->lock); 207 return -ENODEV; 208 } 209 210 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 211 212 if (file->is_async) 213 eventsz = sizeof (struct ib_uverbs_async_event_desc); 214 else 215 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 216 217 if (eventsz > count) { 218 ret = -EINVAL; 219 event = NULL; 220 } else { 221 list_del(file->event_list.next); 222 if (event->counter) { 223 ++(*event->counter); 224 list_del(&event->obj_list); 225 } 226 } 227 228 spin_unlock_irq(&file->lock); 229 230 if (event) { 231 if (copy_to_user(buf, event, eventsz)) 232 ret = -EFAULT; 233 else 234 ret = eventsz; 235 } 236 237 kfree(event); 238 239 return ret; 240 } 241 242 static unsigned int ib_uverbs_event_poll(struct file *filp, 243 struct poll_table_struct *wait) 244 { 245 unsigned int pollflags = 0; 246 struct ib_uverbs_event_file *file = filp->private_data; 247 248 poll_wait(filp, &file->poll_wait, wait); 249 250 spin_lock_irq(&file->lock); 251 if (file->fd < 0) 252 pollflags = POLLERR; 253 else if (!list_empty(&file->event_list)) 254 pollflags = POLLIN | POLLRDNORM; 255 spin_unlock_irq(&file->lock); 256 257 return pollflags; 258 } 259 260 static void ib_uverbs_event_release(struct ib_uverbs_event_file *file) 261 { 262 struct ib_uverbs_event *entry, *tmp; 263 264 spin_lock_irq(&file->lock); 265 if (file->fd != -1) { 266 file->fd = -1; 267 list_for_each_entry_safe(entry, tmp, &file->event_list, list) 268 kfree(entry); 269 } 270 spin_unlock_irq(&file->lock); 271 } 272 273 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 274 { 275 struct ib_uverbs_event_file *file = filp->private_data; 276 277 return fasync_helper(fd, filp, on, &file->async_queue); 278 } 279 280 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 281 { 282 struct ib_uverbs_event_file *file = filp->private_data; 283 284 ib_uverbs_event_release(file); 285 ib_uverbs_event_fasync(-1, filp, 0); 286 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 287 288 return 0; 289 } 290 291 static struct file_operations uverbs_event_fops = { 292 /* 293 * No .owner field since we artificially create event files, 294 * so there is no increment to the module reference count in 295 * the open path. All event files come from a uverbs command 296 * file, which already takes a module reference, so this is OK. 297 */ 298 .read = ib_uverbs_event_read, 299 .poll = ib_uverbs_event_poll, 300 .release = ib_uverbs_event_close, 301 .fasync = ib_uverbs_event_fasync 302 }; 303 304 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 305 { 306 struct ib_uverbs_file *file = cq_context; 307 struct ib_ucq_object *uobj; 308 struct ib_uverbs_event *entry; 309 unsigned long flags; 310 311 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 312 if (!entry) 313 return; 314 315 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 316 317 entry->desc.comp.cq_handle = cq->uobject->user_handle; 318 entry->counter = &uobj->comp_events_reported; 319 320 spin_lock_irqsave(&file->comp_file[0].lock, flags); 321 list_add_tail(&entry->list, &file->comp_file[0].event_list); 322 list_add_tail(&entry->obj_list, &uobj->comp_list); 323 spin_unlock_irqrestore(&file->comp_file[0].lock, flags); 324 325 wake_up_interruptible(&file->comp_file[0].poll_wait); 326 kill_fasync(&file->comp_file[0].async_queue, SIGIO, POLL_IN); 327 } 328 329 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 330 __u64 element, __u64 event, 331 struct list_head *obj_list, 332 u32 *counter) 333 { 334 struct ib_uverbs_event *entry; 335 unsigned long flags; 336 337 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 338 if (!entry) 339 return; 340 341 entry->desc.async.element = element; 342 entry->desc.async.event_type = event; 343 entry->counter = counter; 344 345 spin_lock_irqsave(&file->async_file.lock, flags); 346 list_add_tail(&entry->list, &file->async_file.event_list); 347 if (obj_list) 348 list_add_tail(&entry->obj_list, obj_list); 349 spin_unlock_irqrestore(&file->async_file.lock, flags); 350 351 wake_up_interruptible(&file->async_file.poll_wait); 352 kill_fasync(&file->async_file.async_queue, SIGIO, POLL_IN); 353 } 354 355 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 356 { 357 struct ib_ucq_object *uobj; 358 359 uobj = container_of(event->element.cq->uobject, 360 struct ib_ucq_object, uobject); 361 362 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 363 event->event, &uobj->async_list, 364 &uobj->async_events_reported); 365 366 } 367 368 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 369 { 370 struct ib_uevent_object *uobj; 371 372 uobj = container_of(event->element.qp->uobject, 373 struct ib_uevent_object, uobject); 374 375 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 376 event->event, &uobj->event_list, 377 &uobj->events_reported); 378 } 379 380 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 381 { 382 struct ib_uevent_object *uobj; 383 384 uobj = container_of(event->element.srq->uobject, 385 struct ib_uevent_object, uobject); 386 387 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 388 event->event, &uobj->event_list, 389 &uobj->events_reported); 390 } 391 392 static void ib_uverbs_event_handler(struct ib_event_handler *handler, 393 struct ib_event *event) 394 { 395 struct ib_uverbs_file *file = 396 container_of(handler, struct ib_uverbs_file, event_handler); 397 398 ib_uverbs_async_handler(file, event->element.port_num, event->event, 399 NULL, NULL); 400 } 401 402 static int ib_uverbs_event_init(struct ib_uverbs_event_file *file, 403 struct ib_uverbs_file *uverbs_file) 404 { 405 struct file *filp; 406 407 spin_lock_init(&file->lock); 408 INIT_LIST_HEAD(&file->event_list); 409 init_waitqueue_head(&file->poll_wait); 410 file->uverbs_file = uverbs_file; 411 file->async_queue = NULL; 412 413 file->fd = get_unused_fd(); 414 if (file->fd < 0) 415 return file->fd; 416 417 filp = get_empty_filp(); 418 if (!filp) { 419 put_unused_fd(file->fd); 420 return -ENFILE; 421 } 422 423 filp->f_op = &uverbs_event_fops; 424 filp->f_vfsmnt = mntget(uverbs_event_mnt); 425 filp->f_dentry = dget(uverbs_event_mnt->mnt_root); 426 filp->f_mapping = filp->f_dentry->d_inode->i_mapping; 427 filp->f_flags = O_RDONLY; 428 filp->f_mode = FMODE_READ; 429 filp->private_data = file; 430 431 fd_install(file->fd, filp); 432 433 return 0; 434 } 435 436 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 437 size_t count, loff_t *pos) 438 { 439 struct ib_uverbs_file *file = filp->private_data; 440 struct ib_uverbs_cmd_hdr hdr; 441 442 if (count < sizeof hdr) 443 return -EINVAL; 444 445 if (copy_from_user(&hdr, buf, sizeof hdr)) 446 return -EFAULT; 447 448 if (hdr.in_words * 4 != count) 449 return -EINVAL; 450 451 if (hdr.command < 0 || 452 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 453 !uverbs_cmd_table[hdr.command]) 454 return -EINVAL; 455 456 if (!file->ucontext && 457 hdr.command != IB_USER_VERBS_CMD_QUERY_PARAMS && 458 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 459 return -EINVAL; 460 461 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 462 hdr.in_words * 4, hdr.out_words * 4); 463 } 464 465 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 466 { 467 struct ib_uverbs_file *file = filp->private_data; 468 469 if (!file->ucontext) 470 return -ENODEV; 471 else 472 return file->device->ib_dev->mmap(file->ucontext, vma); 473 } 474 475 static int ib_uverbs_open(struct inode *inode, struct file *filp) 476 { 477 struct ib_uverbs_device *dev = 478 container_of(inode->i_cdev, struct ib_uverbs_device, dev); 479 struct ib_uverbs_file *file; 480 int i = 0; 481 int ret; 482 483 if (!try_module_get(dev->ib_dev->owner)) 484 return -ENODEV; 485 486 file = kmalloc(sizeof *file + 487 (dev->num_comp - 1) * sizeof (struct ib_uverbs_event_file), 488 GFP_KERNEL); 489 if (!file) { 490 ret = -ENOMEM; 491 goto err; 492 } 493 494 file->device = dev; 495 kref_init(&file->ref); 496 init_MUTEX(&file->mutex); 497 498 file->ucontext = NULL; 499 500 kref_get(&file->ref); 501 ret = ib_uverbs_event_init(&file->async_file, file); 502 if (ret) 503 goto err_kref; 504 505 file->async_file.is_async = 1; 506 507 for (i = 0; i < dev->num_comp; ++i) { 508 kref_get(&file->ref); 509 ret = ib_uverbs_event_init(&file->comp_file[i], file); 510 if (ret) 511 goto err_async; 512 file->comp_file[i].is_async = 0; 513 } 514 515 516 filp->private_data = file; 517 518 INIT_IB_EVENT_HANDLER(&file->event_handler, dev->ib_dev, 519 ib_uverbs_event_handler); 520 if (ib_register_event_handler(&file->event_handler)) 521 goto err_async; 522 523 return 0; 524 525 err_async: 526 while (i--) 527 ib_uverbs_event_release(&file->comp_file[i]); 528 529 ib_uverbs_event_release(&file->async_file); 530 531 err_kref: 532 /* 533 * One extra kref_put() because we took a reference before the 534 * event file creation that failed and got us here. 535 */ 536 kref_put(&file->ref, ib_uverbs_release_file); 537 kref_put(&file->ref, ib_uverbs_release_file); 538 539 err: 540 module_put(dev->ib_dev->owner); 541 return ret; 542 } 543 544 static int ib_uverbs_close(struct inode *inode, struct file *filp) 545 { 546 struct ib_uverbs_file *file = filp->private_data; 547 int i; 548 549 ib_unregister_event_handler(&file->event_handler); 550 ib_uverbs_event_release(&file->async_file); 551 ib_dealloc_ucontext(file->ucontext); 552 553 for (i = 0; i < file->device->num_comp; ++i) 554 ib_uverbs_event_release(&file->comp_file[i]); 555 556 kref_put(&file->ref, ib_uverbs_release_file); 557 558 return 0; 559 } 560 561 static struct file_operations uverbs_fops = { 562 .owner = THIS_MODULE, 563 .write = ib_uverbs_write, 564 .open = ib_uverbs_open, 565 .release = ib_uverbs_close 566 }; 567 568 static struct file_operations uverbs_mmap_fops = { 569 .owner = THIS_MODULE, 570 .write = ib_uverbs_write, 571 .mmap = ib_uverbs_mmap, 572 .open = ib_uverbs_open, 573 .release = ib_uverbs_close 574 }; 575 576 static struct ib_client uverbs_client = { 577 .name = "uverbs", 578 .add = ib_uverbs_add_one, 579 .remove = ib_uverbs_remove_one 580 }; 581 582 static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 583 { 584 struct ib_uverbs_device *dev = 585 container_of(class_dev, struct ib_uverbs_device, class_dev); 586 587 return sprintf(buf, "%s\n", dev->ib_dev->name); 588 } 589 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 590 591 static void ib_uverbs_release_class_dev(struct class_device *class_dev) 592 { 593 struct ib_uverbs_device *dev = 594 container_of(class_dev, struct ib_uverbs_device, class_dev); 595 596 cdev_del(&dev->dev); 597 clear_bit(dev->devnum, dev_map); 598 kfree(dev); 599 } 600 601 static struct class uverbs_class = { 602 .name = "infiniband_verbs", 603 .release = ib_uverbs_release_class_dev 604 }; 605 606 static ssize_t show_abi_version(struct class *class, char *buf) 607 { 608 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 609 } 610 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 611 612 static void ib_uverbs_add_one(struct ib_device *device) 613 { 614 struct ib_uverbs_device *uverbs_dev; 615 616 if (!device->alloc_ucontext) 617 return; 618 619 uverbs_dev = kmalloc(sizeof *uverbs_dev, GFP_KERNEL); 620 if (!uverbs_dev) 621 return; 622 623 memset(uverbs_dev, 0, sizeof *uverbs_dev); 624 625 spin_lock(&map_lock); 626 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 627 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 628 spin_unlock(&map_lock); 629 goto err; 630 } 631 set_bit(uverbs_dev->devnum, dev_map); 632 spin_unlock(&map_lock); 633 634 uverbs_dev->ib_dev = device; 635 uverbs_dev->num_comp = 1; 636 637 if (device->mmap) 638 cdev_init(&uverbs_dev->dev, &uverbs_mmap_fops); 639 else 640 cdev_init(&uverbs_dev->dev, &uverbs_fops); 641 uverbs_dev->dev.owner = THIS_MODULE; 642 kobject_set_name(&uverbs_dev->dev.kobj, "uverbs%d", uverbs_dev->devnum); 643 if (cdev_add(&uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 644 goto err; 645 646 uverbs_dev->class_dev.class = &uverbs_class; 647 uverbs_dev->class_dev.dev = device->dma_device; 648 uverbs_dev->class_dev.devt = uverbs_dev->dev.dev; 649 snprintf(uverbs_dev->class_dev.class_id, BUS_ID_SIZE, "uverbs%d", uverbs_dev->devnum); 650 if (class_device_register(&uverbs_dev->class_dev)) 651 goto err_cdev; 652 653 if (class_device_create_file(&uverbs_dev->class_dev, &class_device_attr_ibdev)) 654 goto err_class; 655 656 ib_set_client_data(device, &uverbs_client, uverbs_dev); 657 658 return; 659 660 err_class: 661 class_device_unregister(&uverbs_dev->class_dev); 662 663 err_cdev: 664 cdev_del(&uverbs_dev->dev); 665 clear_bit(uverbs_dev->devnum, dev_map); 666 667 err: 668 kfree(uverbs_dev); 669 return; 670 } 671 672 static void ib_uverbs_remove_one(struct ib_device *device) 673 { 674 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 675 676 if (!uverbs_dev) 677 return; 678 679 class_device_unregister(&uverbs_dev->class_dev); 680 } 681 682 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 683 const char *dev_name, void *data) 684 { 685 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 686 INFINIBANDEVENTFS_MAGIC); 687 } 688 689 static struct file_system_type uverbs_event_fs = { 690 /* No owner field so module can be unloaded */ 691 .name = "infinibandeventfs", 692 .get_sb = uverbs_event_get_sb, 693 .kill_sb = kill_litter_super 694 }; 695 696 static int __init ib_uverbs_init(void) 697 { 698 int ret; 699 700 spin_lock_init(&map_lock); 701 702 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 703 "infiniband_verbs"); 704 if (ret) { 705 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 706 goto out; 707 } 708 709 ret = class_register(&uverbs_class); 710 if (ret) { 711 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 712 goto out_chrdev; 713 } 714 715 ret = class_create_file(&uverbs_class, &class_attr_abi_version); 716 if (ret) { 717 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 718 goto out_class; 719 } 720 721 ret = register_filesystem(&uverbs_event_fs); 722 if (ret) { 723 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); 724 goto out_class; 725 } 726 727 uverbs_event_mnt = kern_mount(&uverbs_event_fs); 728 if (IS_ERR(uverbs_event_mnt)) { 729 ret = PTR_ERR(uverbs_event_mnt); 730 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); 731 goto out_fs; 732 } 733 734 ret = ib_register_client(&uverbs_client); 735 if (ret) { 736 printk(KERN_ERR "user_verbs: couldn't register client\n"); 737 goto out_mnt; 738 } 739 740 return 0; 741 742 out_mnt: 743 mntput(uverbs_event_mnt); 744 745 out_fs: 746 unregister_filesystem(&uverbs_event_fs); 747 748 out_class: 749 class_unregister(&uverbs_class); 750 751 out_chrdev: 752 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 753 754 out: 755 return ret; 756 } 757 758 static void __exit ib_uverbs_cleanup(void) 759 { 760 ib_unregister_client(&uverbs_client); 761 mntput(uverbs_event_mnt); 762 unregister_filesystem(&uverbs_event_fs); 763 class_unregister(&uverbs_class); 764 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 765 } 766 767 module_init(ib_uverbs_init); 768 module_exit(ib_uverbs_cleanup); 769