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/file.h> 44 #include <linux/mount.h> 45 #include <linux/cdev.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 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 76 static spinlock_t map_lock; 77 static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES]; 78 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 79 80 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 81 const char __user *buf, int in_len, 82 int out_len) = { 83 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 84 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 85 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 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_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 91 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 92 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 93 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 94 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 95 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 96 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 97 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_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_QUERY_SRQ] = ib_uverbs_query_srq, 110 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 111 }; 112 113 static struct vfsmount *uverbs_event_mnt; 114 115 static void ib_uverbs_add_one(struct ib_device *device); 116 static void ib_uverbs_remove_one(struct ib_device *device); 117 118 static void ib_uverbs_release_dev(struct kref *ref) 119 { 120 struct ib_uverbs_device *dev = 121 container_of(ref, struct ib_uverbs_device, ref); 122 123 complete(&dev->comp); 124 } 125 126 static void ib_uverbs_release_event_file(struct kref *ref) 127 { 128 struct ib_uverbs_event_file *file = 129 container_of(ref, struct ib_uverbs_event_file, ref); 130 131 kfree(file); 132 } 133 134 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 135 struct ib_uverbs_event_file *ev_file, 136 struct ib_ucq_object *uobj) 137 { 138 struct ib_uverbs_event *evt, *tmp; 139 140 if (ev_file) { 141 spin_lock_irq(&ev_file->lock); 142 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 143 list_del(&evt->list); 144 kfree(evt); 145 } 146 spin_unlock_irq(&ev_file->lock); 147 148 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 149 } 150 151 spin_lock_irq(&file->async_file->lock); 152 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 153 list_del(&evt->list); 154 kfree(evt); 155 } 156 spin_unlock_irq(&file->async_file->lock); 157 } 158 159 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 160 struct ib_uevent_object *uobj) 161 { 162 struct ib_uverbs_event *evt, *tmp; 163 164 spin_lock_irq(&file->async_file->lock); 165 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 166 list_del(&evt->list); 167 kfree(evt); 168 } 169 spin_unlock_irq(&file->async_file->lock); 170 } 171 172 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 173 struct ib_uqp_object *uobj) 174 { 175 struct ib_uverbs_mcast_entry *mcast, *tmp; 176 177 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 178 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 179 list_del(&mcast->list); 180 kfree(mcast); 181 } 182 } 183 184 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 185 struct ib_ucontext *context) 186 { 187 struct ib_uobject *uobj, *tmp; 188 189 if (!context) 190 return 0; 191 192 context->closing = 1; 193 194 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 195 struct ib_ah *ah = uobj->object; 196 197 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 198 ib_destroy_ah(ah); 199 kfree(uobj); 200 } 201 202 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 203 struct ib_qp *qp = uobj->object; 204 struct ib_uqp_object *uqp = 205 container_of(uobj, struct ib_uqp_object, uevent.uobject); 206 207 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 208 ib_uverbs_detach_umcast(qp, uqp); 209 ib_destroy_qp(qp); 210 ib_uverbs_release_uevent(file, &uqp->uevent); 211 kfree(uqp); 212 } 213 214 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 215 struct ib_cq *cq = uobj->object; 216 struct ib_uverbs_event_file *ev_file = cq->cq_context; 217 struct ib_ucq_object *ucq = 218 container_of(uobj, struct ib_ucq_object, uobject); 219 220 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 221 ib_destroy_cq(cq); 222 ib_uverbs_release_ucq(file, ev_file, ucq); 223 kfree(ucq); 224 } 225 226 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 227 struct ib_srq *srq = uobj->object; 228 struct ib_uevent_object *uevent = 229 container_of(uobj, struct ib_uevent_object, uobject); 230 231 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 232 ib_destroy_srq(srq); 233 ib_uverbs_release_uevent(file, uevent); 234 kfree(uevent); 235 } 236 237 /* XXX Free MWs */ 238 239 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 240 struct ib_mr *mr = uobj->object; 241 242 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 243 ib_dereg_mr(mr); 244 kfree(uobj); 245 } 246 247 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 248 struct ib_pd *pd = uobj->object; 249 250 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 251 ib_dealloc_pd(pd); 252 kfree(uobj); 253 } 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 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 341 { 342 struct ib_uverbs_event_file *file = filp->private_data; 343 344 return fasync_helper(fd, filp, on, &file->async_queue); 345 } 346 347 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 348 { 349 struct ib_uverbs_event_file *file = filp->private_data; 350 struct ib_uverbs_event *entry, *tmp; 351 352 spin_lock_irq(&file->lock); 353 file->is_closed = 1; 354 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 355 if (entry->counter) 356 list_del(&entry->obj_list); 357 kfree(entry); 358 } 359 spin_unlock_irq(&file->lock); 360 361 ib_uverbs_event_fasync(-1, filp, 0); 362 363 if (file->is_async) { 364 ib_unregister_event_handler(&file->uverbs_file->event_handler); 365 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 366 } 367 kref_put(&file->ref, ib_uverbs_release_event_file); 368 369 return 0; 370 } 371 372 static const struct file_operations uverbs_event_fops = { 373 .owner = THIS_MODULE, 374 .read = ib_uverbs_event_read, 375 .poll = ib_uverbs_event_poll, 376 .release = ib_uverbs_event_close, 377 .fasync = ib_uverbs_event_fasync 378 }; 379 380 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 381 { 382 struct ib_uverbs_event_file *file = cq_context; 383 struct ib_ucq_object *uobj; 384 struct ib_uverbs_event *entry; 385 unsigned long flags; 386 387 if (!file) 388 return; 389 390 spin_lock_irqsave(&file->lock, flags); 391 if (file->is_closed) { 392 spin_unlock_irqrestore(&file->lock, flags); 393 return; 394 } 395 396 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 397 if (!entry) { 398 spin_unlock_irqrestore(&file->lock, flags); 399 return; 400 } 401 402 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 403 404 entry->desc.comp.cq_handle = cq->uobject->user_handle; 405 entry->counter = &uobj->comp_events_reported; 406 407 list_add_tail(&entry->list, &file->event_list); 408 list_add_tail(&entry->obj_list, &uobj->comp_list); 409 spin_unlock_irqrestore(&file->lock, flags); 410 411 wake_up_interruptible(&file->poll_wait); 412 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 413 } 414 415 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 416 __u64 element, __u64 event, 417 struct list_head *obj_list, 418 u32 *counter) 419 { 420 struct ib_uverbs_event *entry; 421 unsigned long flags; 422 423 spin_lock_irqsave(&file->async_file->lock, flags); 424 if (file->async_file->is_closed) { 425 spin_unlock_irqrestore(&file->async_file->lock, flags); 426 return; 427 } 428 429 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 430 if (!entry) { 431 spin_unlock_irqrestore(&file->async_file->lock, flags); 432 return; 433 } 434 435 entry->desc.async.element = element; 436 entry->desc.async.event_type = event; 437 entry->counter = counter; 438 439 list_add_tail(&entry->list, &file->async_file->event_list); 440 if (obj_list) 441 list_add_tail(&entry->obj_list, obj_list); 442 spin_unlock_irqrestore(&file->async_file->lock, flags); 443 444 wake_up_interruptible(&file->async_file->poll_wait); 445 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 446 } 447 448 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 449 { 450 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 451 struct ib_ucq_object, uobject); 452 453 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 454 event->event, &uobj->async_list, 455 &uobj->async_events_reported); 456 } 457 458 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 459 { 460 struct ib_uevent_object *uobj; 461 462 uobj = container_of(event->element.qp->uobject, 463 struct ib_uevent_object, uobject); 464 465 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 466 event->event, &uobj->event_list, 467 &uobj->events_reported); 468 } 469 470 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 471 { 472 struct ib_uevent_object *uobj; 473 474 uobj = container_of(event->element.srq->uobject, 475 struct ib_uevent_object, uobject); 476 477 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 478 event->event, &uobj->event_list, 479 &uobj->events_reported); 480 } 481 482 void ib_uverbs_event_handler(struct ib_event_handler *handler, 483 struct ib_event *event) 484 { 485 struct ib_uverbs_file *file = 486 container_of(handler, struct ib_uverbs_file, event_handler); 487 488 ib_uverbs_async_handler(file, event->element.port_num, event->event, 489 NULL, NULL); 490 } 491 492 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 493 int is_async, int *fd) 494 { 495 struct ib_uverbs_event_file *ev_file; 496 struct file *filp; 497 int ret; 498 499 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 500 if (!ev_file) 501 return ERR_PTR(-ENOMEM); 502 503 kref_init(&ev_file->ref); 504 spin_lock_init(&ev_file->lock); 505 INIT_LIST_HEAD(&ev_file->event_list); 506 init_waitqueue_head(&ev_file->poll_wait); 507 ev_file->uverbs_file = uverbs_file; 508 ev_file->async_queue = NULL; 509 ev_file->is_async = is_async; 510 ev_file->is_closed = 0; 511 512 *fd = get_unused_fd(); 513 if (*fd < 0) { 514 ret = *fd; 515 goto err; 516 } 517 518 /* 519 * fops_get() can't fail here, because we're coming from a 520 * system call on a uverbs file, which will already have a 521 * module reference. 522 */ 523 filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root), 524 FMODE_READ, fops_get(&uverbs_event_fops)); 525 if (!filp) { 526 ret = -ENFILE; 527 goto err_fd; 528 } 529 530 filp->private_data = ev_file; 531 532 return filp; 533 534 err_fd: 535 put_unused_fd(*fd); 536 537 err: 538 kfree(ev_file); 539 return ERR_PTR(ret); 540 } 541 542 /* 543 * Look up a completion event file by FD. If lookup is successful, 544 * takes a ref to the event file struct that it returns; if 545 * unsuccessful, returns NULL. 546 */ 547 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 548 { 549 struct ib_uverbs_event_file *ev_file = NULL; 550 struct file *filp; 551 552 filp = fget(fd); 553 if (!filp) 554 return NULL; 555 556 if (filp->f_op != &uverbs_event_fops) 557 goto out; 558 559 ev_file = filp->private_data; 560 if (ev_file->is_async) { 561 ev_file = NULL; 562 goto out; 563 } 564 565 kref_get(&ev_file->ref); 566 567 out: 568 fput(filp); 569 return ev_file; 570 } 571 572 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 573 size_t count, loff_t *pos) 574 { 575 struct ib_uverbs_file *file = filp->private_data; 576 struct ib_uverbs_cmd_hdr hdr; 577 578 if (count < sizeof hdr) 579 return -EINVAL; 580 581 if (copy_from_user(&hdr, buf, sizeof hdr)) 582 return -EFAULT; 583 584 if (hdr.in_words * 4 != count) 585 return -EINVAL; 586 587 if (hdr.command < 0 || 588 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 589 !uverbs_cmd_table[hdr.command] || 590 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 591 return -EINVAL; 592 593 if (!file->ucontext && 594 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 595 return -EINVAL; 596 597 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 598 hdr.in_words * 4, hdr.out_words * 4); 599 } 600 601 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 602 { 603 struct ib_uverbs_file *file = filp->private_data; 604 605 if (!file->ucontext) 606 return -ENODEV; 607 else 608 return file->device->ib_dev->mmap(file->ucontext, vma); 609 } 610 611 /* 612 * ib_uverbs_open() does not need the BKL: 613 * 614 * - dev_table[] accesses are protected by map_lock, the 615 * ib_uverbs_device structures are properly reference counted, and 616 * everything else is purely local to the file being created, so 617 * races against other open calls are not a problem; 618 * - there is no ioctl method to race against; 619 * - the device is added to dev_table[] as the last part of module 620 * initialization, the open method will either immediately run 621 * -ENXIO, or all required initialization will be done. 622 */ 623 static int ib_uverbs_open(struct inode *inode, struct file *filp) 624 { 625 struct ib_uverbs_device *dev; 626 struct ib_uverbs_file *file; 627 int ret; 628 629 spin_lock(&map_lock); 630 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; 631 if (dev) 632 kref_get(&dev->ref); 633 spin_unlock(&map_lock); 634 635 if (!dev) 636 return -ENXIO; 637 638 if (!try_module_get(dev->ib_dev->owner)) { 639 ret = -ENODEV; 640 goto err; 641 } 642 643 file = kmalloc(sizeof *file, GFP_KERNEL); 644 if (!file) { 645 ret = -ENOMEM; 646 goto err_module; 647 } 648 649 file->device = dev; 650 file->ucontext = NULL; 651 file->async_file = NULL; 652 kref_init(&file->ref); 653 mutex_init(&file->mutex); 654 655 filp->private_data = file; 656 657 return 0; 658 659 err_module: 660 module_put(dev->ib_dev->owner); 661 662 err: 663 kref_put(&dev->ref, ib_uverbs_release_dev); 664 return ret; 665 } 666 667 static int ib_uverbs_close(struct inode *inode, struct file *filp) 668 { 669 struct ib_uverbs_file *file = filp->private_data; 670 671 ib_uverbs_cleanup_ucontext(file, file->ucontext); 672 673 if (file->async_file) 674 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 675 676 kref_put(&file->ref, ib_uverbs_release_file); 677 678 return 0; 679 } 680 681 static const struct file_operations uverbs_fops = { 682 .owner = THIS_MODULE, 683 .write = ib_uverbs_write, 684 .open = ib_uverbs_open, 685 .release = ib_uverbs_close 686 }; 687 688 static const struct file_operations uverbs_mmap_fops = { 689 .owner = THIS_MODULE, 690 .write = ib_uverbs_write, 691 .mmap = ib_uverbs_mmap, 692 .open = ib_uverbs_open, 693 .release = ib_uverbs_close 694 }; 695 696 static struct ib_client uverbs_client = { 697 .name = "uverbs", 698 .add = ib_uverbs_add_one, 699 .remove = ib_uverbs_remove_one 700 }; 701 702 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 703 char *buf) 704 { 705 struct ib_uverbs_device *dev = dev_get_drvdata(device); 706 707 if (!dev) 708 return -ENODEV; 709 710 return sprintf(buf, "%s\n", dev->ib_dev->name); 711 } 712 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 713 714 static ssize_t show_dev_abi_version(struct device *device, 715 struct device_attribute *attr, char *buf) 716 { 717 struct ib_uverbs_device *dev = dev_get_drvdata(device); 718 719 if (!dev) 720 return -ENODEV; 721 722 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 723 } 724 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 725 726 static ssize_t show_abi_version(struct class *class, char *buf) 727 { 728 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 729 } 730 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 731 732 static void ib_uverbs_add_one(struct ib_device *device) 733 { 734 struct ib_uverbs_device *uverbs_dev; 735 736 if (!device->alloc_ucontext) 737 return; 738 739 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 740 if (!uverbs_dev) 741 return; 742 743 kref_init(&uverbs_dev->ref); 744 init_completion(&uverbs_dev->comp); 745 746 spin_lock(&map_lock); 747 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 748 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 749 spin_unlock(&map_lock); 750 goto err; 751 } 752 set_bit(uverbs_dev->devnum, dev_map); 753 spin_unlock(&map_lock); 754 755 uverbs_dev->ib_dev = device; 756 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 757 758 uverbs_dev->cdev = cdev_alloc(); 759 if (!uverbs_dev->cdev) 760 goto err; 761 uverbs_dev->cdev->owner = THIS_MODULE; 762 uverbs_dev->cdev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 763 kobject_set_name(&uverbs_dev->cdev->kobj, "uverbs%d", uverbs_dev->devnum); 764 if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 765 goto err_cdev; 766 767 uverbs_dev->dev = device_create_drvdata(uverbs_class, 768 device->dma_device, 769 uverbs_dev->cdev->dev, 770 uverbs_dev, 771 "uverbs%d", 772 uverbs_dev->devnum); 773 if (IS_ERR(uverbs_dev->dev)) 774 goto err_cdev; 775 776 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 777 goto err_class; 778 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 779 goto err_class; 780 781 spin_lock(&map_lock); 782 dev_table[uverbs_dev->devnum] = uverbs_dev; 783 spin_unlock(&map_lock); 784 785 ib_set_client_data(device, &uverbs_client, uverbs_dev); 786 787 return; 788 789 err_class: 790 device_destroy(uverbs_class, uverbs_dev->cdev->dev); 791 792 err_cdev: 793 cdev_del(uverbs_dev->cdev); 794 clear_bit(uverbs_dev->devnum, dev_map); 795 796 err: 797 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 798 wait_for_completion(&uverbs_dev->comp); 799 kfree(uverbs_dev); 800 return; 801 } 802 803 static void ib_uverbs_remove_one(struct ib_device *device) 804 { 805 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 806 807 if (!uverbs_dev) 808 return; 809 810 dev_set_drvdata(uverbs_dev->dev, NULL); 811 device_destroy(uverbs_class, uverbs_dev->cdev->dev); 812 cdev_del(uverbs_dev->cdev); 813 814 spin_lock(&map_lock); 815 dev_table[uverbs_dev->devnum] = NULL; 816 spin_unlock(&map_lock); 817 818 clear_bit(uverbs_dev->devnum, dev_map); 819 820 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 821 wait_for_completion(&uverbs_dev->comp); 822 kfree(uverbs_dev); 823 } 824 825 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 826 const char *dev_name, void *data, 827 struct vfsmount *mnt) 828 { 829 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 830 INFINIBANDEVENTFS_MAGIC, mnt); 831 } 832 833 static struct file_system_type uverbs_event_fs = { 834 /* No owner field so module can be unloaded */ 835 .name = "infinibandeventfs", 836 .get_sb = uverbs_event_get_sb, 837 .kill_sb = kill_litter_super 838 }; 839 840 static int __init ib_uverbs_init(void) 841 { 842 int ret; 843 844 spin_lock_init(&map_lock); 845 846 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 847 "infiniband_verbs"); 848 if (ret) { 849 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 850 goto out; 851 } 852 853 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 854 if (IS_ERR(uverbs_class)) { 855 ret = PTR_ERR(uverbs_class); 856 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 857 goto out_chrdev; 858 } 859 860 ret = class_create_file(uverbs_class, &class_attr_abi_version); 861 if (ret) { 862 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 863 goto out_class; 864 } 865 866 ret = register_filesystem(&uverbs_event_fs); 867 if (ret) { 868 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); 869 goto out_class; 870 } 871 872 uverbs_event_mnt = kern_mount(&uverbs_event_fs); 873 if (IS_ERR(uverbs_event_mnt)) { 874 ret = PTR_ERR(uverbs_event_mnt); 875 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); 876 goto out_fs; 877 } 878 879 ret = ib_register_client(&uverbs_client); 880 if (ret) { 881 printk(KERN_ERR "user_verbs: couldn't register client\n"); 882 goto out_mnt; 883 } 884 885 return 0; 886 887 out_mnt: 888 mntput(uverbs_event_mnt); 889 890 out_fs: 891 unregister_filesystem(&uverbs_event_fs); 892 893 out_class: 894 class_destroy(uverbs_class); 895 896 out_chrdev: 897 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 898 899 out: 900 return ret; 901 } 902 903 static void __exit ib_uverbs_cleanup(void) 904 { 905 ib_unregister_client(&uverbs_client); 906 mntput(uverbs_event_mnt); 907 unregister_filesystem(&uverbs_event_fs); 908 class_destroy(uverbs_class); 909 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 910 idr_destroy(&ib_uverbs_pd_idr); 911 idr_destroy(&ib_uverbs_mr_idr); 912 idr_destroy(&ib_uverbs_mw_idr); 913 idr_destroy(&ib_uverbs_ah_idr); 914 idr_destroy(&ib_uverbs_cq_idr); 915 idr_destroy(&ib_uverbs_qp_idr); 916 idr_destroy(&ib_uverbs_srq_idr); 917 } 918 919 module_init(ib_uverbs_init); 920 module_exit(ib_uverbs_cleanup); 921