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 * 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 * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $ 37 */ 38 39 #include <linux/module.h> 40 #include <linux/init.h> 41 #include <linux/device.h> 42 #include <linux/err.h> 43 #include <linux/fs.h> 44 #include <linux/poll.h> 45 #include <linux/file.h> 46 #include <linux/mount.h> 47 #include <linux/cdev.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 #define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */ 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_MUTEX(ib_uverbs_idr_mutex); 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 78 static spinlock_t map_lock; 79 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES]; 80 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 81 82 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 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_DEREG_MR] = ib_uverbs_dereg_mr, 92 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 93 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 94 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 95 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 96 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 97 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 98 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 99 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 100 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 101 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 102 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 103 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 104 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 105 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 106 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 107 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 108 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 109 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 110 }; 111 112 static struct vfsmount *uverbs_event_mnt; 113 114 static void ib_uverbs_add_one(struct ib_device *device); 115 static void ib_uverbs_remove_one(struct ib_device *device); 116 117 static void ib_uverbs_release_dev(struct kref *ref) 118 { 119 struct ib_uverbs_device *dev = 120 container_of(ref, struct ib_uverbs_device, ref); 121 122 kfree(dev); 123 } 124 125 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 126 struct ib_uverbs_event_file *ev_file, 127 struct ib_ucq_object *uobj) 128 { 129 struct ib_uverbs_event *evt, *tmp; 130 131 if (ev_file) { 132 spin_lock_irq(&ev_file->lock); 133 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 134 list_del(&evt->list); 135 kfree(evt); 136 } 137 spin_unlock_irq(&ev_file->lock); 138 139 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 140 } 141 142 spin_lock_irq(&file->async_file->lock); 143 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 144 list_del(&evt->list); 145 kfree(evt); 146 } 147 spin_unlock_irq(&file->async_file->lock); 148 } 149 150 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 151 struct ib_uevent_object *uobj) 152 { 153 struct ib_uverbs_event *evt, *tmp; 154 155 spin_lock_irq(&file->async_file->lock); 156 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 157 list_del(&evt->list); 158 kfree(evt); 159 } 160 spin_unlock_irq(&file->async_file->lock); 161 } 162 163 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 164 struct ib_uqp_object *uobj) 165 { 166 struct ib_uverbs_mcast_entry *mcast, *tmp; 167 168 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 169 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 170 list_del(&mcast->list); 171 kfree(mcast); 172 } 173 } 174 175 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 176 struct ib_ucontext *context) 177 { 178 struct ib_uobject *uobj, *tmp; 179 180 if (!context) 181 return 0; 182 183 mutex_lock(&ib_uverbs_idr_mutex); 184 185 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 186 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id); 187 idr_remove(&ib_uverbs_ah_idr, uobj->id); 188 ib_destroy_ah(ah); 189 list_del(&uobj->list); 190 kfree(uobj); 191 } 192 193 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 194 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); 195 struct ib_uqp_object *uqp = 196 container_of(uobj, struct ib_uqp_object, uevent.uobject); 197 idr_remove(&ib_uverbs_qp_idr, uobj->id); 198 ib_uverbs_detach_umcast(qp, uqp); 199 ib_destroy_qp(qp); 200 list_del(&uobj->list); 201 ib_uverbs_release_uevent(file, &uqp->uevent); 202 kfree(uqp); 203 } 204 205 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 206 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); 207 struct ib_uverbs_event_file *ev_file = cq->cq_context; 208 struct ib_ucq_object *ucq = 209 container_of(uobj, struct ib_ucq_object, uobject); 210 idr_remove(&ib_uverbs_cq_idr, uobj->id); 211 ib_destroy_cq(cq); 212 list_del(&uobj->list); 213 ib_uverbs_release_ucq(file, ev_file, ucq); 214 kfree(ucq); 215 } 216 217 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 218 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id); 219 struct ib_uevent_object *uevent = 220 container_of(uobj, struct ib_uevent_object, uobject); 221 idr_remove(&ib_uverbs_srq_idr, uobj->id); 222 ib_destroy_srq(srq); 223 list_del(&uobj->list); 224 ib_uverbs_release_uevent(file, uevent); 225 kfree(uevent); 226 } 227 228 /* XXX Free MWs */ 229 230 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 231 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); 232 struct ib_device *mrdev = mr->device; 233 struct ib_umem_object *memobj; 234 235 idr_remove(&ib_uverbs_mr_idr, uobj->id); 236 ib_dereg_mr(mr); 237 238 memobj = container_of(uobj, struct ib_umem_object, uobject); 239 ib_umem_release_on_close(mrdev, &memobj->umem); 240 241 list_del(&uobj->list); 242 kfree(memobj); 243 } 244 245 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 246 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); 247 idr_remove(&ib_uverbs_pd_idr, uobj->id); 248 ib_dealloc_pd(pd); 249 list_del(&uobj->list); 250 kfree(uobj); 251 } 252 253 mutex_unlock(&ib_uverbs_idr_mutex); 254 255 return context->device->dealloc_ucontext(context); 256 } 257 258 static void ib_uverbs_release_file(struct kref *ref) 259 { 260 struct ib_uverbs_file *file = 261 container_of(ref, struct ib_uverbs_file, ref); 262 263 module_put(file->device->ib_dev->owner); 264 kref_put(&file->device->ref, ib_uverbs_release_dev); 265 266 kfree(file); 267 } 268 269 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 270 size_t count, loff_t *pos) 271 { 272 struct ib_uverbs_event_file *file = filp->private_data; 273 struct ib_uverbs_event *event; 274 int eventsz; 275 int ret = 0; 276 277 spin_lock_irq(&file->lock); 278 279 while (list_empty(&file->event_list)) { 280 spin_unlock_irq(&file->lock); 281 282 if (filp->f_flags & O_NONBLOCK) 283 return -EAGAIN; 284 285 if (wait_event_interruptible(file->poll_wait, 286 !list_empty(&file->event_list))) 287 return -ERESTARTSYS; 288 289 spin_lock_irq(&file->lock); 290 } 291 292 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 293 294 if (file->is_async) 295 eventsz = sizeof (struct ib_uverbs_async_event_desc); 296 else 297 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 298 299 if (eventsz > count) { 300 ret = -EINVAL; 301 event = NULL; 302 } else { 303 list_del(file->event_list.next); 304 if (event->counter) { 305 ++(*event->counter); 306 list_del(&event->obj_list); 307 } 308 } 309 310 spin_unlock_irq(&file->lock); 311 312 if (event) { 313 if (copy_to_user(buf, event, eventsz)) 314 ret = -EFAULT; 315 else 316 ret = eventsz; 317 } 318 319 kfree(event); 320 321 return ret; 322 } 323 324 static unsigned int ib_uverbs_event_poll(struct file *filp, 325 struct poll_table_struct *wait) 326 { 327 unsigned int pollflags = 0; 328 struct ib_uverbs_event_file *file = filp->private_data; 329 330 poll_wait(filp, &file->poll_wait, wait); 331 332 spin_lock_irq(&file->lock); 333 if (!list_empty(&file->event_list)) 334 pollflags = POLLIN | POLLRDNORM; 335 spin_unlock_irq(&file->lock); 336 337 return pollflags; 338 } 339 340 void ib_uverbs_release_event_file(struct kref *ref) 341 { 342 struct ib_uverbs_event_file *file = 343 container_of(ref, struct ib_uverbs_event_file, ref); 344 345 kfree(file); 346 } 347 348 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 349 { 350 struct ib_uverbs_event_file *file = filp->private_data; 351 352 return fasync_helper(fd, filp, on, &file->async_queue); 353 } 354 355 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 356 { 357 struct ib_uverbs_event_file *file = filp->private_data; 358 struct ib_uverbs_event *entry, *tmp; 359 360 spin_lock_irq(&file->lock); 361 file->file = NULL; 362 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 363 if (entry->counter) 364 list_del(&entry->obj_list); 365 kfree(entry); 366 } 367 spin_unlock_irq(&file->lock); 368 369 ib_uverbs_event_fasync(-1, filp, 0); 370 371 if (file->is_async) { 372 ib_unregister_event_handler(&file->uverbs_file->event_handler); 373 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 374 } 375 kref_put(&file->ref, ib_uverbs_release_event_file); 376 377 return 0; 378 } 379 380 static struct file_operations uverbs_event_fops = { 381 .owner = THIS_MODULE, 382 .read = ib_uverbs_event_read, 383 .poll = ib_uverbs_event_poll, 384 .release = ib_uverbs_event_close, 385 .fasync = ib_uverbs_event_fasync 386 }; 387 388 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 389 { 390 struct ib_uverbs_event_file *file = cq_context; 391 struct ib_ucq_object *uobj; 392 struct ib_uverbs_event *entry; 393 unsigned long flags; 394 395 if (!file) 396 return; 397 398 spin_lock_irqsave(&file->lock, flags); 399 if (!file->file) { 400 spin_unlock_irqrestore(&file->lock, flags); 401 return; 402 } 403 404 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 405 if (!entry) { 406 spin_unlock_irqrestore(&file->lock, flags); 407 return; 408 } 409 410 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 411 412 entry->desc.comp.cq_handle = cq->uobject->user_handle; 413 entry->counter = &uobj->comp_events_reported; 414 415 list_add_tail(&entry->list, &file->event_list); 416 list_add_tail(&entry->obj_list, &uobj->comp_list); 417 spin_unlock_irqrestore(&file->lock, flags); 418 419 wake_up_interruptible(&file->poll_wait); 420 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 421 } 422 423 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 424 __u64 element, __u64 event, 425 struct list_head *obj_list, 426 u32 *counter) 427 { 428 struct ib_uverbs_event *entry; 429 unsigned long flags; 430 431 spin_lock_irqsave(&file->async_file->lock, flags); 432 if (!file->async_file->file) { 433 spin_unlock_irqrestore(&file->async_file->lock, flags); 434 return; 435 } 436 437 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 438 if (!entry) { 439 spin_unlock_irqrestore(&file->async_file->lock, flags); 440 return; 441 } 442 443 entry->desc.async.element = element; 444 entry->desc.async.event_type = event; 445 entry->counter = counter; 446 447 list_add_tail(&entry->list, &file->async_file->event_list); 448 if (obj_list) 449 list_add_tail(&entry->obj_list, obj_list); 450 spin_unlock_irqrestore(&file->async_file->lock, flags); 451 452 wake_up_interruptible(&file->async_file->poll_wait); 453 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 454 } 455 456 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 457 { 458 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 459 struct ib_ucq_object, uobject); 460 461 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 462 event->event, &uobj->async_list, 463 &uobj->async_events_reported); 464 465 } 466 467 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 468 { 469 struct ib_uevent_object *uobj; 470 471 uobj = container_of(event->element.qp->uobject, 472 struct ib_uevent_object, uobject); 473 474 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 475 event->event, &uobj->event_list, 476 &uobj->events_reported); 477 } 478 479 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 480 { 481 struct ib_uevent_object *uobj; 482 483 uobj = container_of(event->element.srq->uobject, 484 struct ib_uevent_object, uobject); 485 486 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 487 event->event, &uobj->event_list, 488 &uobj->events_reported); 489 } 490 491 void ib_uverbs_event_handler(struct ib_event_handler *handler, 492 struct ib_event *event) 493 { 494 struct ib_uverbs_file *file = 495 container_of(handler, struct ib_uverbs_file, event_handler); 496 497 ib_uverbs_async_handler(file, event->element.port_num, event->event, 498 NULL, NULL); 499 } 500 501 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 502 int is_async, int *fd) 503 { 504 struct ib_uverbs_event_file *ev_file; 505 struct file *filp; 506 int ret; 507 508 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 509 if (!ev_file) 510 return ERR_PTR(-ENOMEM); 511 512 kref_init(&ev_file->ref); 513 spin_lock_init(&ev_file->lock); 514 INIT_LIST_HEAD(&ev_file->event_list); 515 init_waitqueue_head(&ev_file->poll_wait); 516 ev_file->uverbs_file = uverbs_file; 517 ev_file->async_queue = NULL; 518 ev_file->is_async = is_async; 519 520 *fd = get_unused_fd(); 521 if (*fd < 0) { 522 ret = *fd; 523 goto err; 524 } 525 526 filp = get_empty_filp(); 527 if (!filp) { 528 ret = -ENFILE; 529 goto err_fd; 530 } 531 532 ev_file->file = filp; 533 534 /* 535 * fops_get() can't fail here, because we're coming from a 536 * system call on a uverbs file, which will already have a 537 * module reference. 538 */ 539 filp->f_op = fops_get(&uverbs_event_fops); 540 filp->f_vfsmnt = mntget(uverbs_event_mnt); 541 filp->f_dentry = dget(uverbs_event_mnt->mnt_root); 542 filp->f_mapping = filp->f_dentry->d_inode->i_mapping; 543 filp->f_flags = O_RDONLY; 544 filp->f_mode = FMODE_READ; 545 filp->private_data = ev_file; 546 547 return filp; 548 549 err_fd: 550 put_unused_fd(*fd); 551 552 err: 553 kfree(ev_file); 554 return ERR_PTR(ret); 555 } 556 557 /* 558 * Look up a completion event file by FD. If lookup is successful, 559 * takes a ref to the event file struct that it returns; if 560 * unsuccessful, returns NULL. 561 */ 562 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 563 { 564 struct ib_uverbs_event_file *ev_file = NULL; 565 struct file *filp; 566 567 filp = fget(fd); 568 if (!filp) 569 return NULL; 570 571 if (filp->f_op != &uverbs_event_fops) 572 goto out; 573 574 ev_file = filp->private_data; 575 if (ev_file->is_async) { 576 ev_file = NULL; 577 goto out; 578 } 579 580 kref_get(&ev_file->ref); 581 582 out: 583 fput(filp); 584 return ev_file; 585 } 586 587 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 588 size_t count, loff_t *pos) 589 { 590 struct ib_uverbs_file *file = filp->private_data; 591 struct ib_uverbs_cmd_hdr hdr; 592 593 if (count < sizeof hdr) 594 return -EINVAL; 595 596 if (copy_from_user(&hdr, buf, sizeof hdr)) 597 return -EFAULT; 598 599 if (hdr.in_words * 4 != count) 600 return -EINVAL; 601 602 if (hdr.command < 0 || 603 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 604 !uverbs_cmd_table[hdr.command] || 605 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 606 return -EINVAL; 607 608 if (!file->ucontext && 609 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 610 return -EINVAL; 611 612 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 613 hdr.in_words * 4, hdr.out_words * 4); 614 } 615 616 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 617 { 618 struct ib_uverbs_file *file = filp->private_data; 619 620 if (!file->ucontext) 621 return -ENODEV; 622 else 623 return file->device->ib_dev->mmap(file->ucontext, vma); 624 } 625 626 static int ib_uverbs_open(struct inode *inode, struct file *filp) 627 { 628 struct ib_uverbs_device *dev; 629 struct ib_uverbs_file *file; 630 int ret; 631 632 spin_lock(&map_lock); 633 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; 634 if (dev) 635 kref_get(&dev->ref); 636 spin_unlock(&map_lock); 637 638 if (!dev) 639 return -ENXIO; 640 641 if (!try_module_get(dev->ib_dev->owner)) { 642 ret = -ENODEV; 643 goto err; 644 } 645 646 file = kmalloc(sizeof *file, GFP_KERNEL); 647 if (!file) { 648 ret = -ENOMEM; 649 goto err_module; 650 } 651 652 file->device = dev; 653 file->ucontext = NULL; 654 file->async_file = NULL; 655 kref_init(&file->ref); 656 mutex_init(&file->mutex); 657 658 filp->private_data = file; 659 660 return 0; 661 662 err_module: 663 module_put(dev->ib_dev->owner); 664 665 err: 666 kref_put(&dev->ref, ib_uverbs_release_dev); 667 668 return ret; 669 } 670 671 static int ib_uverbs_close(struct inode *inode, struct file *filp) 672 { 673 struct ib_uverbs_file *file = filp->private_data; 674 675 ib_uverbs_cleanup_ucontext(file, file->ucontext); 676 677 if (file->async_file) 678 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 679 680 kref_put(&file->ref, ib_uverbs_release_file); 681 682 return 0; 683 } 684 685 static struct file_operations uverbs_fops = { 686 .owner = THIS_MODULE, 687 .write = ib_uverbs_write, 688 .open = ib_uverbs_open, 689 .release = ib_uverbs_close 690 }; 691 692 static struct file_operations uverbs_mmap_fops = { 693 .owner = THIS_MODULE, 694 .write = ib_uverbs_write, 695 .mmap = ib_uverbs_mmap, 696 .open = ib_uverbs_open, 697 .release = ib_uverbs_close 698 }; 699 700 static struct ib_client uverbs_client = { 701 .name = "uverbs", 702 .add = ib_uverbs_add_one, 703 .remove = ib_uverbs_remove_one 704 }; 705 706 static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 707 { 708 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 709 710 if (!dev) 711 return -ENODEV; 712 713 return sprintf(buf, "%s\n", dev->ib_dev->name); 714 } 715 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 716 717 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf) 718 { 719 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 720 721 if (!dev) 722 return -ENODEV; 723 724 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 725 } 726 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 727 728 static ssize_t show_abi_version(struct class *class, char *buf) 729 { 730 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 731 } 732 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 733 734 static void ib_uverbs_add_one(struct ib_device *device) 735 { 736 struct ib_uverbs_device *uverbs_dev; 737 738 if (!device->alloc_ucontext) 739 return; 740 741 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 742 if (!uverbs_dev) 743 return; 744 745 kref_init(&uverbs_dev->ref); 746 747 spin_lock(&map_lock); 748 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 749 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 750 spin_unlock(&map_lock); 751 goto err; 752 } 753 set_bit(uverbs_dev->devnum, dev_map); 754 spin_unlock(&map_lock); 755 756 uverbs_dev->ib_dev = device; 757 uverbs_dev->num_comp_vectors = 1; 758 759 uverbs_dev->dev = cdev_alloc(); 760 if (!uverbs_dev->dev) 761 goto err; 762 uverbs_dev->dev->owner = THIS_MODULE; 763 uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 764 kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum); 765 if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 766 goto err_cdev; 767 768 uverbs_dev->class_dev = class_device_create(uverbs_class, NULL, 769 uverbs_dev->dev->dev, 770 device->dma_device, 771 "uverbs%d", uverbs_dev->devnum); 772 if (IS_ERR(uverbs_dev->class_dev)) 773 goto err_cdev; 774 775 class_set_devdata(uverbs_dev->class_dev, uverbs_dev); 776 777 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev)) 778 goto err_class; 779 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version)) 780 goto err_class; 781 782 spin_lock(&map_lock); 783 dev_table[uverbs_dev->devnum] = uverbs_dev; 784 spin_unlock(&map_lock); 785 786 ib_set_client_data(device, &uverbs_client, uverbs_dev); 787 788 return; 789 790 err_class: 791 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 792 793 err_cdev: 794 cdev_del(uverbs_dev->dev); 795 clear_bit(uverbs_dev->devnum, dev_map); 796 797 err: 798 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 799 return; 800 } 801 802 static void ib_uverbs_remove_one(struct ib_device *device) 803 { 804 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 805 806 if (!uverbs_dev) 807 return; 808 809 class_set_devdata(uverbs_dev->class_dev, NULL); 810 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 811 cdev_del(uverbs_dev->dev); 812 813 spin_lock(&map_lock); 814 dev_table[uverbs_dev->devnum] = NULL; 815 spin_unlock(&map_lock); 816 817 clear_bit(uverbs_dev->devnum, dev_map); 818 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 819 } 820 821 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 822 const char *dev_name, void *data) 823 { 824 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 825 INFINIBANDEVENTFS_MAGIC); 826 } 827 828 static struct file_system_type uverbs_event_fs = { 829 /* No owner field so module can be unloaded */ 830 .name = "infinibandeventfs", 831 .get_sb = uverbs_event_get_sb, 832 .kill_sb = kill_litter_super 833 }; 834 835 static int __init ib_uverbs_init(void) 836 { 837 int ret; 838 839 spin_lock_init(&map_lock); 840 841 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 842 "infiniband_verbs"); 843 if (ret) { 844 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 845 goto out; 846 } 847 848 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 849 if (IS_ERR(uverbs_class)) { 850 ret = PTR_ERR(uverbs_class); 851 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 852 goto out_chrdev; 853 } 854 855 ret = class_create_file(uverbs_class, &class_attr_abi_version); 856 if (ret) { 857 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 858 goto out_class; 859 } 860 861 ret = register_filesystem(&uverbs_event_fs); 862 if (ret) { 863 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); 864 goto out_class; 865 } 866 867 uverbs_event_mnt = kern_mount(&uverbs_event_fs); 868 if (IS_ERR(uverbs_event_mnt)) { 869 ret = PTR_ERR(uverbs_event_mnt); 870 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); 871 goto out_fs; 872 } 873 874 ret = ib_register_client(&uverbs_client); 875 if (ret) { 876 printk(KERN_ERR "user_verbs: couldn't register client\n"); 877 goto out_mnt; 878 } 879 880 return 0; 881 882 out_mnt: 883 mntput(uverbs_event_mnt); 884 885 out_fs: 886 unregister_filesystem(&uverbs_event_fs); 887 888 out_class: 889 class_destroy(uverbs_class); 890 891 out_chrdev: 892 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 893 894 out: 895 return ret; 896 } 897 898 static void __exit ib_uverbs_cleanup(void) 899 { 900 ib_unregister_client(&uverbs_client); 901 mntput(uverbs_event_mnt); 902 unregister_filesystem(&uverbs_event_fs); 903 class_destroy(uverbs_class); 904 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 905 flush_scheduled_work(); 906 idr_destroy(&ib_uverbs_pd_idr); 907 idr_destroy(&ib_uverbs_mr_idr); 908 idr_destroy(&ib_uverbs_mw_idr); 909 idr_destroy(&ib_uverbs_ah_idr); 910 idr_destroy(&ib_uverbs_cq_idr); 911 idr_destroy(&ib_uverbs_qp_idr); 912 idr_destroy(&ib_uverbs_srq_idr); 913 } 914 915 module_init(ib_uverbs_init); 916 module_exit(ib_uverbs_cleanup); 917