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 * $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_SPINLOCK(ib_uverbs_idr_lock); 70 DEFINE_IDR(ib_uverbs_pd_idr); 71 DEFINE_IDR(ib_uverbs_mr_idr); 72 DEFINE_IDR(ib_uverbs_mw_idr); 73 DEFINE_IDR(ib_uverbs_ah_idr); 74 DEFINE_IDR(ib_uverbs_cq_idr); 75 DEFINE_IDR(ib_uverbs_qp_idr); 76 DEFINE_IDR(ib_uverbs_srq_idr); 77 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_RESIZE_CQ] = ib_uverbs_resize_cq, 95 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 96 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 97 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 98 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 99 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 100 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 101 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 102 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 103 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 104 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 105 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 106 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 107 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 108 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 109 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 110 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 111 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 112 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 113 }; 114 115 static struct vfsmount *uverbs_event_mnt; 116 117 static void ib_uverbs_add_one(struct ib_device *device); 118 static void ib_uverbs_remove_one(struct ib_device *device); 119 120 static void ib_uverbs_release_dev(struct kref *ref) 121 { 122 struct ib_uverbs_device *dev = 123 container_of(ref, struct ib_uverbs_device, ref); 124 125 complete(&dev->comp); 126 } 127 128 static void ib_uverbs_release_event_file(struct kref *ref) 129 { 130 struct ib_uverbs_event_file *file = 131 container_of(ref, struct ib_uverbs_event_file, ref); 132 133 kfree(file); 134 } 135 136 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 137 struct ib_uverbs_event_file *ev_file, 138 struct ib_ucq_object *uobj) 139 { 140 struct ib_uverbs_event *evt, *tmp; 141 142 if (ev_file) { 143 spin_lock_irq(&ev_file->lock); 144 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 145 list_del(&evt->list); 146 kfree(evt); 147 } 148 spin_unlock_irq(&ev_file->lock); 149 150 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 151 } 152 153 spin_lock_irq(&file->async_file->lock); 154 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 155 list_del(&evt->list); 156 kfree(evt); 157 } 158 spin_unlock_irq(&file->async_file->lock); 159 } 160 161 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 162 struct ib_uevent_object *uobj) 163 { 164 struct ib_uverbs_event *evt, *tmp; 165 166 spin_lock_irq(&file->async_file->lock); 167 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 168 list_del(&evt->list); 169 kfree(evt); 170 } 171 spin_unlock_irq(&file->async_file->lock); 172 } 173 174 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 175 struct ib_uqp_object *uobj) 176 { 177 struct ib_uverbs_mcast_entry *mcast, *tmp; 178 179 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 180 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 181 list_del(&mcast->list); 182 kfree(mcast); 183 } 184 } 185 186 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 187 struct ib_ucontext *context) 188 { 189 struct ib_uobject *uobj, *tmp; 190 191 if (!context) 192 return 0; 193 194 context->closing = 1; 195 196 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 197 struct ib_ah *ah = uobj->object; 198 199 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 200 ib_destroy_ah(ah); 201 kfree(uobj); 202 } 203 204 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 205 struct ib_qp *qp = uobj->object; 206 struct ib_uqp_object *uqp = 207 container_of(uobj, struct ib_uqp_object, uevent.uobject); 208 209 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 210 ib_uverbs_detach_umcast(qp, uqp); 211 ib_destroy_qp(qp); 212 ib_uverbs_release_uevent(file, &uqp->uevent); 213 kfree(uqp); 214 } 215 216 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 217 struct ib_cq *cq = uobj->object; 218 struct ib_uverbs_event_file *ev_file = cq->cq_context; 219 struct ib_ucq_object *ucq = 220 container_of(uobj, struct ib_ucq_object, uobject); 221 222 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 223 ib_destroy_cq(cq); 224 ib_uverbs_release_ucq(file, ev_file, ucq); 225 kfree(ucq); 226 } 227 228 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 229 struct ib_srq *srq = uobj->object; 230 struct ib_uevent_object *uevent = 231 container_of(uobj, struct ib_uevent_object, uobject); 232 233 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 234 ib_destroy_srq(srq); 235 ib_uverbs_release_uevent(file, uevent); 236 kfree(uevent); 237 } 238 239 /* XXX Free MWs */ 240 241 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 242 struct ib_mr *mr = uobj->object; 243 244 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 245 ib_dereg_mr(mr); 246 kfree(uobj); 247 } 248 249 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 250 struct ib_pd *pd = uobj->object; 251 252 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 253 ib_dealloc_pd(pd); 254 kfree(uobj); 255 } 256 257 return context->device->dealloc_ucontext(context); 258 } 259 260 static void ib_uverbs_release_file(struct kref *ref) 261 { 262 struct ib_uverbs_file *file = 263 container_of(ref, struct ib_uverbs_file, ref); 264 265 module_put(file->device->ib_dev->owner); 266 kref_put(&file->device->ref, ib_uverbs_release_dev); 267 268 kfree(file); 269 } 270 271 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 272 size_t count, loff_t *pos) 273 { 274 struct ib_uverbs_event_file *file = filp->private_data; 275 struct ib_uverbs_event *event; 276 int eventsz; 277 int ret = 0; 278 279 spin_lock_irq(&file->lock); 280 281 while (list_empty(&file->event_list)) { 282 spin_unlock_irq(&file->lock); 283 284 if (filp->f_flags & O_NONBLOCK) 285 return -EAGAIN; 286 287 if (wait_event_interruptible(file->poll_wait, 288 !list_empty(&file->event_list))) 289 return -ERESTARTSYS; 290 291 spin_lock_irq(&file->lock); 292 } 293 294 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 295 296 if (file->is_async) 297 eventsz = sizeof (struct ib_uverbs_async_event_desc); 298 else 299 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 300 301 if (eventsz > count) { 302 ret = -EINVAL; 303 event = NULL; 304 } else { 305 list_del(file->event_list.next); 306 if (event->counter) { 307 ++(*event->counter); 308 list_del(&event->obj_list); 309 } 310 } 311 312 spin_unlock_irq(&file->lock); 313 314 if (event) { 315 if (copy_to_user(buf, event, eventsz)) 316 ret = -EFAULT; 317 else 318 ret = eventsz; 319 } 320 321 kfree(event); 322 323 return ret; 324 } 325 326 static unsigned int ib_uverbs_event_poll(struct file *filp, 327 struct poll_table_struct *wait) 328 { 329 unsigned int pollflags = 0; 330 struct ib_uverbs_event_file *file = filp->private_data; 331 332 poll_wait(filp, &file->poll_wait, wait); 333 334 spin_lock_irq(&file->lock); 335 if (!list_empty(&file->event_list)) 336 pollflags = POLLIN | POLLRDNORM; 337 spin_unlock_irq(&file->lock); 338 339 return pollflags; 340 } 341 342 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 343 { 344 struct ib_uverbs_event_file *file = filp->private_data; 345 346 return fasync_helper(fd, filp, on, &file->async_queue); 347 } 348 349 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 350 { 351 struct ib_uverbs_event_file *file = filp->private_data; 352 struct ib_uverbs_event *entry, *tmp; 353 354 spin_lock_irq(&file->lock); 355 file->is_closed = 1; 356 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 357 if (entry->counter) 358 list_del(&entry->obj_list); 359 kfree(entry); 360 } 361 spin_unlock_irq(&file->lock); 362 363 ib_uverbs_event_fasync(-1, filp, 0); 364 365 if (file->is_async) { 366 ib_unregister_event_handler(&file->uverbs_file->event_handler); 367 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 368 } 369 kref_put(&file->ref, ib_uverbs_release_event_file); 370 371 return 0; 372 } 373 374 static const struct file_operations uverbs_event_fops = { 375 .owner = THIS_MODULE, 376 .read = ib_uverbs_event_read, 377 .poll = ib_uverbs_event_poll, 378 .release = ib_uverbs_event_close, 379 .fasync = ib_uverbs_event_fasync 380 }; 381 382 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 383 { 384 struct ib_uverbs_event_file *file = cq_context; 385 struct ib_ucq_object *uobj; 386 struct ib_uverbs_event *entry; 387 unsigned long flags; 388 389 if (!file) 390 return; 391 392 spin_lock_irqsave(&file->lock, flags); 393 if (file->is_closed) { 394 spin_unlock_irqrestore(&file->lock, flags); 395 return; 396 } 397 398 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 399 if (!entry) { 400 spin_unlock_irqrestore(&file->lock, flags); 401 return; 402 } 403 404 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 405 406 entry->desc.comp.cq_handle = cq->uobject->user_handle; 407 entry->counter = &uobj->comp_events_reported; 408 409 list_add_tail(&entry->list, &file->event_list); 410 list_add_tail(&entry->obj_list, &uobj->comp_list); 411 spin_unlock_irqrestore(&file->lock, flags); 412 413 wake_up_interruptible(&file->poll_wait); 414 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 415 } 416 417 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 418 __u64 element, __u64 event, 419 struct list_head *obj_list, 420 u32 *counter) 421 { 422 struct ib_uverbs_event *entry; 423 unsigned long flags; 424 425 spin_lock_irqsave(&file->async_file->lock, flags); 426 if (!file->async_file->is_closed) { 427 spin_unlock_irqrestore(&file->async_file->lock, flags); 428 return; 429 } 430 431 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 432 if (!entry) { 433 spin_unlock_irqrestore(&file->async_file->lock, flags); 434 return; 435 } 436 437 entry->desc.async.element = element; 438 entry->desc.async.event_type = event; 439 entry->counter = counter; 440 441 list_add_tail(&entry->list, &file->async_file->event_list); 442 if (obj_list) 443 list_add_tail(&entry->obj_list, obj_list); 444 spin_unlock_irqrestore(&file->async_file->lock, flags); 445 446 wake_up_interruptible(&file->async_file->poll_wait); 447 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 448 } 449 450 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 451 { 452 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 453 struct ib_ucq_object, uobject); 454 455 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 456 event->event, &uobj->async_list, 457 &uobj->async_events_reported); 458 } 459 460 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 461 { 462 struct ib_uevent_object *uobj; 463 464 uobj = container_of(event->element.qp->uobject, 465 struct ib_uevent_object, uobject); 466 467 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 468 event->event, &uobj->event_list, 469 &uobj->events_reported); 470 } 471 472 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 473 { 474 struct ib_uevent_object *uobj; 475 476 uobj = container_of(event->element.srq->uobject, 477 struct ib_uevent_object, uobject); 478 479 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 480 event->event, &uobj->event_list, 481 &uobj->events_reported); 482 } 483 484 void ib_uverbs_event_handler(struct ib_event_handler *handler, 485 struct ib_event *event) 486 { 487 struct ib_uverbs_file *file = 488 container_of(handler, struct ib_uverbs_file, event_handler); 489 490 ib_uverbs_async_handler(file, event->element.port_num, event->event, 491 NULL, NULL); 492 } 493 494 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 495 int is_async, int *fd) 496 { 497 struct ib_uverbs_event_file *ev_file; 498 struct file *filp; 499 int ret; 500 501 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 502 if (!ev_file) 503 return ERR_PTR(-ENOMEM); 504 505 kref_init(&ev_file->ref); 506 spin_lock_init(&ev_file->lock); 507 INIT_LIST_HEAD(&ev_file->event_list); 508 init_waitqueue_head(&ev_file->poll_wait); 509 ev_file->uverbs_file = uverbs_file; 510 ev_file->async_queue = NULL; 511 ev_file->is_async = is_async; 512 ev_file->is_closed = 0; 513 514 *fd = get_unused_fd(); 515 if (*fd < 0) { 516 ret = *fd; 517 goto err; 518 } 519 520 /* 521 * fops_get() can't fail here, because we're coming from a 522 * system call on a uverbs file, which will already have a 523 * module reference. 524 */ 525 filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root), 526 FMODE_READ, fops_get(&uverbs_event_fops)); 527 if (!filp) { 528 ret = -ENFILE; 529 goto err_fd; 530 } 531 532 filp->private_data = ev_file; 533 534 return filp; 535 536 err_fd: 537 put_unused_fd(*fd); 538 539 err: 540 kfree(ev_file); 541 return ERR_PTR(ret); 542 } 543 544 /* 545 * Look up a completion event file by FD. If lookup is successful, 546 * takes a ref to the event file struct that it returns; if 547 * unsuccessful, returns NULL. 548 */ 549 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 550 { 551 struct ib_uverbs_event_file *ev_file = NULL; 552 struct file *filp; 553 554 filp = fget(fd); 555 if (!filp) 556 return NULL; 557 558 if (filp->f_op != &uverbs_event_fops) 559 goto out; 560 561 ev_file = filp->private_data; 562 if (ev_file->is_async) { 563 ev_file = NULL; 564 goto out; 565 } 566 567 kref_get(&ev_file->ref); 568 569 out: 570 fput(filp); 571 return ev_file; 572 } 573 574 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 575 size_t count, loff_t *pos) 576 { 577 struct ib_uverbs_file *file = filp->private_data; 578 struct ib_uverbs_cmd_hdr hdr; 579 580 if (count < sizeof hdr) 581 return -EINVAL; 582 583 if (copy_from_user(&hdr, buf, sizeof hdr)) 584 return -EFAULT; 585 586 if (hdr.in_words * 4 != count) 587 return -EINVAL; 588 589 if (hdr.command < 0 || 590 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 591 !uverbs_cmd_table[hdr.command] || 592 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 593 return -EINVAL; 594 595 if (!file->ucontext && 596 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 597 return -EINVAL; 598 599 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 600 hdr.in_words * 4, hdr.out_words * 4); 601 } 602 603 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 604 { 605 struct ib_uverbs_file *file = filp->private_data; 606 607 if (!file->ucontext) 608 return -ENODEV; 609 else 610 return file->device->ib_dev->mmap(file->ucontext, vma); 611 } 612 613 static int ib_uverbs_open(struct inode *inode, struct file *filp) 614 { 615 struct ib_uverbs_device *dev; 616 struct ib_uverbs_file *file; 617 int ret; 618 619 spin_lock(&map_lock); 620 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; 621 if (dev) 622 kref_get(&dev->ref); 623 spin_unlock(&map_lock); 624 625 if (!dev) 626 return -ENXIO; 627 628 if (!try_module_get(dev->ib_dev->owner)) { 629 ret = -ENODEV; 630 goto err; 631 } 632 633 file = kmalloc(sizeof *file, GFP_KERNEL); 634 if (!file) { 635 ret = -ENOMEM; 636 goto err_module; 637 } 638 639 file->device = dev; 640 file->ucontext = NULL; 641 file->async_file = NULL; 642 kref_init(&file->ref); 643 mutex_init(&file->mutex); 644 645 filp->private_data = file; 646 647 return 0; 648 649 err_module: 650 module_put(dev->ib_dev->owner); 651 652 err: 653 kref_put(&dev->ref, ib_uverbs_release_dev); 654 655 return ret; 656 } 657 658 static int ib_uverbs_close(struct inode *inode, struct file *filp) 659 { 660 struct ib_uverbs_file *file = filp->private_data; 661 662 ib_uverbs_cleanup_ucontext(file, file->ucontext); 663 664 if (file->async_file) 665 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 666 667 kref_put(&file->ref, ib_uverbs_release_file); 668 669 return 0; 670 } 671 672 static const struct file_operations uverbs_fops = { 673 .owner = THIS_MODULE, 674 .write = ib_uverbs_write, 675 .open = ib_uverbs_open, 676 .release = ib_uverbs_close 677 }; 678 679 static const struct file_operations uverbs_mmap_fops = { 680 .owner = THIS_MODULE, 681 .write = ib_uverbs_write, 682 .mmap = ib_uverbs_mmap, 683 .open = ib_uverbs_open, 684 .release = ib_uverbs_close 685 }; 686 687 static struct ib_client uverbs_client = { 688 .name = "uverbs", 689 .add = ib_uverbs_add_one, 690 .remove = ib_uverbs_remove_one 691 }; 692 693 static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 694 { 695 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 696 697 if (!dev) 698 return -ENODEV; 699 700 return sprintf(buf, "%s\n", dev->ib_dev->name); 701 } 702 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 703 704 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf) 705 { 706 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 707 708 if (!dev) 709 return -ENODEV; 710 711 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 712 } 713 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 714 715 static ssize_t show_abi_version(struct class *class, char *buf) 716 { 717 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 718 } 719 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 720 721 static void ib_uverbs_add_one(struct ib_device *device) 722 { 723 struct ib_uverbs_device *uverbs_dev; 724 725 if (!device->alloc_ucontext) 726 return; 727 728 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 729 if (!uverbs_dev) 730 return; 731 732 kref_init(&uverbs_dev->ref); 733 init_completion(&uverbs_dev->comp); 734 735 spin_lock(&map_lock); 736 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 737 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 738 spin_unlock(&map_lock); 739 goto err; 740 } 741 set_bit(uverbs_dev->devnum, dev_map); 742 spin_unlock(&map_lock); 743 744 uverbs_dev->ib_dev = device; 745 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 746 747 uverbs_dev->dev = cdev_alloc(); 748 if (!uverbs_dev->dev) 749 goto err; 750 uverbs_dev->dev->owner = THIS_MODULE; 751 uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 752 kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum); 753 if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 754 goto err_cdev; 755 756 uverbs_dev->class_dev = class_device_create(uverbs_class, NULL, 757 uverbs_dev->dev->dev, 758 device->dma_device, 759 "uverbs%d", uverbs_dev->devnum); 760 if (IS_ERR(uverbs_dev->class_dev)) 761 goto err_cdev; 762 763 class_set_devdata(uverbs_dev->class_dev, uverbs_dev); 764 765 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev)) 766 goto err_class; 767 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version)) 768 goto err_class; 769 770 spin_lock(&map_lock); 771 dev_table[uverbs_dev->devnum] = uverbs_dev; 772 spin_unlock(&map_lock); 773 774 ib_set_client_data(device, &uverbs_client, uverbs_dev); 775 776 return; 777 778 err_class: 779 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 780 781 err_cdev: 782 cdev_del(uverbs_dev->dev); 783 clear_bit(uverbs_dev->devnum, dev_map); 784 785 err: 786 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 787 wait_for_completion(&uverbs_dev->comp); 788 kfree(uverbs_dev); 789 return; 790 } 791 792 static void ib_uverbs_remove_one(struct ib_device *device) 793 { 794 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 795 796 if (!uverbs_dev) 797 return; 798 799 class_set_devdata(uverbs_dev->class_dev, NULL); 800 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 801 cdev_del(uverbs_dev->dev); 802 803 spin_lock(&map_lock); 804 dev_table[uverbs_dev->devnum] = NULL; 805 spin_unlock(&map_lock); 806 807 clear_bit(uverbs_dev->devnum, dev_map); 808 809 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 810 wait_for_completion(&uverbs_dev->comp); 811 kfree(uverbs_dev); 812 } 813 814 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 815 const char *dev_name, void *data, 816 struct vfsmount *mnt) 817 { 818 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 819 INFINIBANDEVENTFS_MAGIC, mnt); 820 } 821 822 static struct file_system_type uverbs_event_fs = { 823 /* No owner field so module can be unloaded */ 824 .name = "infinibandeventfs", 825 .get_sb = uverbs_event_get_sb, 826 .kill_sb = kill_litter_super 827 }; 828 829 static int __init ib_uverbs_init(void) 830 { 831 int ret; 832 833 spin_lock_init(&map_lock); 834 835 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 836 "infiniband_verbs"); 837 if (ret) { 838 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 839 goto out; 840 } 841 842 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 843 if (IS_ERR(uverbs_class)) { 844 ret = PTR_ERR(uverbs_class); 845 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 846 goto out_chrdev; 847 } 848 849 ret = class_create_file(uverbs_class, &class_attr_abi_version); 850 if (ret) { 851 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 852 goto out_class; 853 } 854 855 ret = register_filesystem(&uverbs_event_fs); 856 if (ret) { 857 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); 858 goto out_class; 859 } 860 861 uverbs_event_mnt = kern_mount(&uverbs_event_fs); 862 if (IS_ERR(uverbs_event_mnt)) { 863 ret = PTR_ERR(uverbs_event_mnt); 864 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); 865 goto out_fs; 866 } 867 868 ret = ib_register_client(&uverbs_client); 869 if (ret) { 870 printk(KERN_ERR "user_verbs: couldn't register client\n"); 871 goto out_mnt; 872 } 873 874 return 0; 875 876 out_mnt: 877 mntput(uverbs_event_mnt); 878 879 out_fs: 880 unregister_filesystem(&uverbs_event_fs); 881 882 out_class: 883 class_destroy(uverbs_class); 884 885 out_chrdev: 886 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 887 888 out: 889 return ret; 890 } 891 892 static void __exit ib_uverbs_cleanup(void) 893 { 894 ib_unregister_client(&uverbs_client); 895 mntput(uverbs_event_mnt); 896 unregister_filesystem(&uverbs_event_fs); 897 class_destroy(uverbs_class); 898 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 899 idr_destroy(&ib_uverbs_pd_idr); 900 idr_destroy(&ib_uverbs_mr_idr); 901 idr_destroy(&ib_uverbs_mw_idr); 902 idr_destroy(&ib_uverbs_ah_idr); 903 idr_destroy(&ib_uverbs_cq_idr); 904 idr_destroy(&ib_uverbs_qp_idr); 905 idr_destroy(&ib_uverbs_srq_idr); 906 } 907 908 module_init(ib_uverbs_init); 909 module_exit(ib_uverbs_cleanup); 910