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 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 129 struct ib_uverbs_event_file *ev_file, 130 struct ib_ucq_object *uobj) 131 { 132 struct ib_uverbs_event *evt, *tmp; 133 134 if (ev_file) { 135 spin_lock_irq(&ev_file->lock); 136 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 137 list_del(&evt->list); 138 kfree(evt); 139 } 140 spin_unlock_irq(&ev_file->lock); 141 142 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 143 } 144 145 spin_lock_irq(&file->async_file->lock); 146 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 147 list_del(&evt->list); 148 kfree(evt); 149 } 150 spin_unlock_irq(&file->async_file->lock); 151 } 152 153 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 154 struct ib_uevent_object *uobj) 155 { 156 struct ib_uverbs_event *evt, *tmp; 157 158 spin_lock_irq(&file->async_file->lock); 159 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 160 list_del(&evt->list); 161 kfree(evt); 162 } 163 spin_unlock_irq(&file->async_file->lock); 164 } 165 166 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 167 struct ib_uqp_object *uobj) 168 { 169 struct ib_uverbs_mcast_entry *mcast, *tmp; 170 171 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 172 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 173 list_del(&mcast->list); 174 kfree(mcast); 175 } 176 } 177 178 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 179 struct ib_ucontext *context) 180 { 181 struct ib_uobject *uobj, *tmp; 182 183 if (!context) 184 return 0; 185 186 context->closing = 1; 187 188 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 189 struct ib_ah *ah = uobj->object; 190 191 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 192 ib_destroy_ah(ah); 193 kfree(uobj); 194 } 195 196 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 197 struct ib_qp *qp = uobj->object; 198 struct ib_uqp_object *uqp = 199 container_of(uobj, struct ib_uqp_object, uevent.uobject); 200 201 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 202 ib_uverbs_detach_umcast(qp, uqp); 203 ib_destroy_qp(qp); 204 ib_uverbs_release_uevent(file, &uqp->uevent); 205 kfree(uqp); 206 } 207 208 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 209 struct ib_cq *cq = uobj->object; 210 struct ib_uverbs_event_file *ev_file = cq->cq_context; 211 struct ib_ucq_object *ucq = 212 container_of(uobj, struct ib_ucq_object, uobject); 213 214 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 215 ib_destroy_cq(cq); 216 ib_uverbs_release_ucq(file, ev_file, ucq); 217 kfree(ucq); 218 } 219 220 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 221 struct ib_srq *srq = uobj->object; 222 struct ib_uevent_object *uevent = 223 container_of(uobj, struct ib_uevent_object, uobject); 224 225 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 226 ib_destroy_srq(srq); 227 ib_uverbs_release_uevent(file, uevent); 228 kfree(uevent); 229 } 230 231 /* XXX Free MWs */ 232 233 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 234 struct ib_mr *mr = uobj->object; 235 236 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 237 ib_dereg_mr(mr); 238 kfree(uobj); 239 } 240 241 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 242 struct ib_pd *pd = uobj->object; 243 244 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 245 ib_dealloc_pd(pd); 246 kfree(uobj); 247 } 248 249 return context->device->dealloc_ucontext(context); 250 } 251 252 static void ib_uverbs_release_file(struct kref *ref) 253 { 254 struct ib_uverbs_file *file = 255 container_of(ref, struct ib_uverbs_file, ref); 256 257 module_put(file->device->ib_dev->owner); 258 kref_put(&file->device->ref, ib_uverbs_release_dev); 259 260 kfree(file); 261 } 262 263 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 264 size_t count, loff_t *pos) 265 { 266 struct ib_uverbs_event_file *file = filp->private_data; 267 struct ib_uverbs_event *event; 268 int eventsz; 269 int ret = 0; 270 271 spin_lock_irq(&file->lock); 272 273 while (list_empty(&file->event_list)) { 274 spin_unlock_irq(&file->lock); 275 276 if (filp->f_flags & O_NONBLOCK) 277 return -EAGAIN; 278 279 if (wait_event_interruptible(file->poll_wait, 280 !list_empty(&file->event_list))) 281 return -ERESTARTSYS; 282 283 spin_lock_irq(&file->lock); 284 } 285 286 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 287 288 if (file->is_async) 289 eventsz = sizeof (struct ib_uverbs_async_event_desc); 290 else 291 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 292 293 if (eventsz > count) { 294 ret = -EINVAL; 295 event = NULL; 296 } else { 297 list_del(file->event_list.next); 298 if (event->counter) { 299 ++(*event->counter); 300 list_del(&event->obj_list); 301 } 302 } 303 304 spin_unlock_irq(&file->lock); 305 306 if (event) { 307 if (copy_to_user(buf, event, eventsz)) 308 ret = -EFAULT; 309 else 310 ret = eventsz; 311 } 312 313 kfree(event); 314 315 return ret; 316 } 317 318 static unsigned int ib_uverbs_event_poll(struct file *filp, 319 struct poll_table_struct *wait) 320 { 321 unsigned int pollflags = 0; 322 struct ib_uverbs_event_file *file = filp->private_data; 323 324 poll_wait(filp, &file->poll_wait, wait); 325 326 spin_lock_irq(&file->lock); 327 if (!list_empty(&file->event_list)) 328 pollflags = POLLIN | POLLRDNORM; 329 spin_unlock_irq(&file->lock); 330 331 return pollflags; 332 } 333 334 void ib_uverbs_release_event_file(struct kref *ref) 335 { 336 struct ib_uverbs_event_file *file = 337 container_of(ref, struct ib_uverbs_event_file, ref); 338 339 kfree(file); 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->file = NULL; 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->file) { 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->file) { 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; 512 513 *fd = get_unused_fd(); 514 if (*fd < 0) { 515 ret = *fd; 516 goto err; 517 } 518 519 filp = get_empty_filp(); 520 if (!filp) { 521 ret = -ENFILE; 522 goto err_fd; 523 } 524 525 ev_file->file = filp; 526 527 /* 528 * fops_get() can't fail here, because we're coming from a 529 * system call on a uverbs file, which will already have a 530 * module reference. 531 */ 532 filp->f_op = fops_get(&uverbs_event_fops); 533 filp->f_path.mnt = mntget(uverbs_event_mnt); 534 filp->f_path.dentry = dget(uverbs_event_mnt->mnt_root); 535 filp->f_mapping = filp->f_path.dentry->d_inode->i_mapping; 536 filp->f_flags = O_RDONLY; 537 filp->f_mode = FMODE_READ; 538 filp->private_data = ev_file; 539 540 return filp; 541 542 err_fd: 543 put_unused_fd(*fd); 544 545 err: 546 kfree(ev_file); 547 return ERR_PTR(ret); 548 } 549 550 /* 551 * Look up a completion event file by FD. If lookup is successful, 552 * takes a ref to the event file struct that it returns; if 553 * unsuccessful, returns NULL. 554 */ 555 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 556 { 557 struct ib_uverbs_event_file *ev_file = NULL; 558 struct file *filp; 559 560 filp = fget(fd); 561 if (!filp) 562 return NULL; 563 564 if (filp->f_op != &uverbs_event_fops) 565 goto out; 566 567 ev_file = filp->private_data; 568 if (ev_file->is_async) { 569 ev_file = NULL; 570 goto out; 571 } 572 573 kref_get(&ev_file->ref); 574 575 out: 576 fput(filp); 577 return ev_file; 578 } 579 580 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 581 size_t count, loff_t *pos) 582 { 583 struct ib_uverbs_file *file = filp->private_data; 584 struct ib_uverbs_cmd_hdr hdr; 585 586 if (count < sizeof hdr) 587 return -EINVAL; 588 589 if (copy_from_user(&hdr, buf, sizeof hdr)) 590 return -EFAULT; 591 592 if (hdr.in_words * 4 != count) 593 return -EINVAL; 594 595 if (hdr.command < 0 || 596 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 597 !uverbs_cmd_table[hdr.command] || 598 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 599 return -EINVAL; 600 601 if (!file->ucontext && 602 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 603 return -EINVAL; 604 605 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 606 hdr.in_words * 4, hdr.out_words * 4); 607 } 608 609 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 610 { 611 struct ib_uverbs_file *file = filp->private_data; 612 613 if (!file->ucontext) 614 return -ENODEV; 615 else 616 return file->device->ib_dev->mmap(file->ucontext, vma); 617 } 618 619 static int ib_uverbs_open(struct inode *inode, struct file *filp) 620 { 621 struct ib_uverbs_device *dev; 622 struct ib_uverbs_file *file; 623 int ret; 624 625 spin_lock(&map_lock); 626 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; 627 if (dev) 628 kref_get(&dev->ref); 629 spin_unlock(&map_lock); 630 631 if (!dev) 632 return -ENXIO; 633 634 if (!try_module_get(dev->ib_dev->owner)) { 635 ret = -ENODEV; 636 goto err; 637 } 638 639 file = kmalloc(sizeof *file, GFP_KERNEL); 640 if (!file) { 641 ret = -ENOMEM; 642 goto err_module; 643 } 644 645 file->device = dev; 646 file->ucontext = NULL; 647 file->async_file = NULL; 648 kref_init(&file->ref); 649 mutex_init(&file->mutex); 650 651 filp->private_data = file; 652 653 return 0; 654 655 err_module: 656 module_put(dev->ib_dev->owner); 657 658 err: 659 kref_put(&dev->ref, ib_uverbs_release_dev); 660 661 return ret; 662 } 663 664 static int ib_uverbs_close(struct inode *inode, struct file *filp) 665 { 666 struct ib_uverbs_file *file = filp->private_data; 667 668 ib_uverbs_cleanup_ucontext(file, file->ucontext); 669 670 if (file->async_file) 671 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 672 673 kref_put(&file->ref, ib_uverbs_release_file); 674 675 return 0; 676 } 677 678 static const struct file_operations uverbs_fops = { 679 .owner = THIS_MODULE, 680 .write = ib_uverbs_write, 681 .open = ib_uverbs_open, 682 .release = ib_uverbs_close 683 }; 684 685 static const struct file_operations uverbs_mmap_fops = { 686 .owner = THIS_MODULE, 687 .write = ib_uverbs_write, 688 .mmap = ib_uverbs_mmap, 689 .open = ib_uverbs_open, 690 .release = ib_uverbs_close 691 }; 692 693 static struct ib_client uverbs_client = { 694 .name = "uverbs", 695 .add = ib_uverbs_add_one, 696 .remove = ib_uverbs_remove_one 697 }; 698 699 static ssize_t show_ibdev(struct class_device *class_dev, char *buf) 700 { 701 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 702 703 if (!dev) 704 return -ENODEV; 705 706 return sprintf(buf, "%s\n", dev->ib_dev->name); 707 } 708 static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 709 710 static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf) 711 { 712 struct ib_uverbs_device *dev = class_get_devdata(class_dev); 713 714 if (!dev) 715 return -ENODEV; 716 717 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 718 } 719 static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 720 721 static ssize_t show_abi_version(struct class *class, char *buf) 722 { 723 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 724 } 725 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 726 727 static void ib_uverbs_add_one(struct ib_device *device) 728 { 729 struct ib_uverbs_device *uverbs_dev; 730 731 if (!device->alloc_ucontext) 732 return; 733 734 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 735 if (!uverbs_dev) 736 return; 737 738 kref_init(&uverbs_dev->ref); 739 init_completion(&uverbs_dev->comp); 740 741 spin_lock(&map_lock); 742 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 743 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 744 spin_unlock(&map_lock); 745 goto err; 746 } 747 set_bit(uverbs_dev->devnum, dev_map); 748 spin_unlock(&map_lock); 749 750 uverbs_dev->ib_dev = device; 751 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 752 753 uverbs_dev->dev = cdev_alloc(); 754 if (!uverbs_dev->dev) 755 goto err; 756 uverbs_dev->dev->owner = THIS_MODULE; 757 uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 758 kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum); 759 if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 760 goto err_cdev; 761 762 uverbs_dev->class_dev = class_device_create(uverbs_class, NULL, 763 uverbs_dev->dev->dev, 764 device->dma_device, 765 "uverbs%d", uverbs_dev->devnum); 766 if (IS_ERR(uverbs_dev->class_dev)) 767 goto err_cdev; 768 769 class_set_devdata(uverbs_dev->class_dev, uverbs_dev); 770 771 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev)) 772 goto err_class; 773 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version)) 774 goto err_class; 775 776 spin_lock(&map_lock); 777 dev_table[uverbs_dev->devnum] = uverbs_dev; 778 spin_unlock(&map_lock); 779 780 ib_set_client_data(device, &uverbs_client, uverbs_dev); 781 782 return; 783 784 err_class: 785 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 786 787 err_cdev: 788 cdev_del(uverbs_dev->dev); 789 clear_bit(uverbs_dev->devnum, dev_map); 790 791 err: 792 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 793 wait_for_completion(&uverbs_dev->comp); 794 kfree(uverbs_dev); 795 return; 796 } 797 798 static void ib_uverbs_remove_one(struct ib_device *device) 799 { 800 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 801 802 if (!uverbs_dev) 803 return; 804 805 class_set_devdata(uverbs_dev->class_dev, NULL); 806 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 807 cdev_del(uverbs_dev->dev); 808 809 spin_lock(&map_lock); 810 dev_table[uverbs_dev->devnum] = NULL; 811 spin_unlock(&map_lock); 812 813 clear_bit(uverbs_dev->devnum, dev_map); 814 815 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 816 wait_for_completion(&uverbs_dev->comp); 817 kfree(uverbs_dev); 818 } 819 820 static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 821 const char *dev_name, void *data, 822 struct vfsmount *mnt) 823 { 824 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 825 INFINIBANDEVENTFS_MAGIC, mnt); 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 idr_destroy(&ib_uverbs_pd_idr); 906 idr_destroy(&ib_uverbs_mr_idr); 907 idr_destroy(&ib_uverbs_mw_idr); 908 idr_destroy(&ib_uverbs_ah_idr); 909 idr_destroy(&ib_uverbs_cq_idr); 910 idr_destroy(&ib_uverbs_qp_idr); 911 idr_destroy(&ib_uverbs_srq_idr); 912 } 913 914 module_init(ib_uverbs_init); 915 module_exit(ib_uverbs_cleanup); 916