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 DECLARE_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 int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 164 struct ib_ucontext *context) 165 { 166 struct ib_uobject *uobj, *tmp; 167 168 if (!context) 169 return 0; 170 171 down(&ib_uverbs_idr_mutex); 172 173 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 174 struct ib_ah *ah = idr_find(&ib_uverbs_ah_idr, uobj->id); 175 idr_remove(&ib_uverbs_ah_idr, uobj->id); 176 ib_destroy_ah(ah); 177 list_del(&uobj->list); 178 kfree(uobj); 179 } 180 181 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 182 struct ib_qp *qp = idr_find(&ib_uverbs_qp_idr, uobj->id); 183 struct ib_uevent_object *uevent = 184 container_of(uobj, struct ib_uevent_object, uobject); 185 idr_remove(&ib_uverbs_qp_idr, uobj->id); 186 ib_destroy_qp(qp); 187 list_del(&uobj->list); 188 ib_uverbs_release_uevent(file, uevent); 189 kfree(uevent); 190 } 191 192 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 193 struct ib_cq *cq = idr_find(&ib_uverbs_cq_idr, uobj->id); 194 struct ib_uverbs_event_file *ev_file = cq->cq_context; 195 struct ib_ucq_object *ucq = 196 container_of(uobj, struct ib_ucq_object, uobject); 197 idr_remove(&ib_uverbs_cq_idr, uobj->id); 198 ib_destroy_cq(cq); 199 list_del(&uobj->list); 200 ib_uverbs_release_ucq(file, ev_file, ucq); 201 kfree(ucq); 202 } 203 204 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 205 struct ib_srq *srq = idr_find(&ib_uverbs_srq_idr, uobj->id); 206 struct ib_uevent_object *uevent = 207 container_of(uobj, struct ib_uevent_object, uobject); 208 idr_remove(&ib_uverbs_srq_idr, uobj->id); 209 ib_destroy_srq(srq); 210 list_del(&uobj->list); 211 ib_uverbs_release_uevent(file, uevent); 212 kfree(uevent); 213 } 214 215 /* XXX Free MWs */ 216 217 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 218 struct ib_mr *mr = idr_find(&ib_uverbs_mr_idr, uobj->id); 219 struct ib_device *mrdev = mr->device; 220 struct ib_umem_object *memobj; 221 222 idr_remove(&ib_uverbs_mr_idr, uobj->id); 223 ib_dereg_mr(mr); 224 225 memobj = container_of(uobj, struct ib_umem_object, uobject); 226 ib_umem_release_on_close(mrdev, &memobj->umem); 227 228 list_del(&uobj->list); 229 kfree(memobj); 230 } 231 232 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 233 struct ib_pd *pd = idr_find(&ib_uverbs_pd_idr, uobj->id); 234 idr_remove(&ib_uverbs_pd_idr, uobj->id); 235 ib_dealloc_pd(pd); 236 list_del(&uobj->list); 237 kfree(uobj); 238 } 239 240 up(&ib_uverbs_idr_mutex); 241 242 return context->device->dealloc_ucontext(context); 243 } 244 245 static void ib_uverbs_release_file(struct kref *ref) 246 { 247 struct ib_uverbs_file *file = 248 container_of(ref, struct ib_uverbs_file, ref); 249 250 module_put(file->device->ib_dev->owner); 251 kref_put(&file->device->ref, ib_uverbs_release_dev); 252 253 kfree(file); 254 } 255 256 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 257 size_t count, loff_t *pos) 258 { 259 struct ib_uverbs_event_file *file = filp->private_data; 260 struct ib_uverbs_event *event; 261 int eventsz; 262 int ret = 0; 263 264 spin_lock_irq(&file->lock); 265 266 while (list_empty(&file->event_list)) { 267 spin_unlock_irq(&file->lock); 268 269 if (filp->f_flags & O_NONBLOCK) 270 return -EAGAIN; 271 272 if (wait_event_interruptible(file->poll_wait, 273 !list_empty(&file->event_list))) 274 return -ERESTARTSYS; 275 276 spin_lock_irq(&file->lock); 277 } 278 279 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 280 281 if (file->is_async) 282 eventsz = sizeof (struct ib_uverbs_async_event_desc); 283 else 284 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 285 286 if (eventsz > count) { 287 ret = -EINVAL; 288 event = NULL; 289 } else { 290 list_del(file->event_list.next); 291 if (event->counter) { 292 ++(*event->counter); 293 list_del(&event->obj_list); 294 } 295 } 296 297 spin_unlock_irq(&file->lock); 298 299 if (event) { 300 if (copy_to_user(buf, event, eventsz)) 301 ret = -EFAULT; 302 else 303 ret = eventsz; 304 } 305 306 kfree(event); 307 308 return ret; 309 } 310 311 static unsigned int ib_uverbs_event_poll(struct file *filp, 312 struct poll_table_struct *wait) 313 { 314 unsigned int pollflags = 0; 315 struct ib_uverbs_event_file *file = filp->private_data; 316 317 poll_wait(filp, &file->poll_wait, wait); 318 319 spin_lock_irq(&file->lock); 320 if (!list_empty(&file->event_list)) 321 pollflags = POLLIN | POLLRDNORM; 322 spin_unlock_irq(&file->lock); 323 324 return pollflags; 325 } 326 327 void ib_uverbs_release_event_file(struct kref *ref) 328 { 329 struct ib_uverbs_event_file *file = 330 container_of(ref, struct ib_uverbs_event_file, ref); 331 332 kfree(file); 333 } 334 335 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 336 { 337 struct ib_uverbs_event_file *file = filp->private_data; 338 339 return fasync_helper(fd, filp, on, &file->async_queue); 340 } 341 342 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 343 { 344 struct ib_uverbs_event_file *file = filp->private_data; 345 struct ib_uverbs_event *entry, *tmp; 346 347 spin_lock_irq(&file->lock); 348 file->file = NULL; 349 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 350 if (entry->counter) 351 list_del(&entry->obj_list); 352 kfree(entry); 353 } 354 spin_unlock_irq(&file->lock); 355 356 ib_uverbs_event_fasync(-1, filp, 0); 357 358 if (file->is_async) { 359 ib_unregister_event_handler(&file->uverbs_file->event_handler); 360 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 361 } 362 kref_put(&file->ref, ib_uverbs_release_event_file); 363 364 return 0; 365 } 366 367 static struct file_operations uverbs_event_fops = { 368 .owner = THIS_MODULE, 369 .read = ib_uverbs_event_read, 370 .poll = ib_uverbs_event_poll, 371 .release = ib_uverbs_event_close, 372 .fasync = ib_uverbs_event_fasync 373 }; 374 375 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 376 { 377 struct ib_uverbs_event_file *file = cq_context; 378 struct ib_ucq_object *uobj; 379 struct ib_uverbs_event *entry; 380 unsigned long flags; 381 382 if (!file) 383 return; 384 385 spin_lock_irqsave(&file->lock, flags); 386 if (!file->file) { 387 spin_unlock_irqrestore(&file->lock, flags); 388 return; 389 } 390 391 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 392 if (!entry) { 393 spin_unlock_irqrestore(&file->lock, flags); 394 return; 395 } 396 397 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 398 399 entry->desc.comp.cq_handle = cq->uobject->user_handle; 400 entry->counter = &uobj->comp_events_reported; 401 402 list_add_tail(&entry->list, &file->event_list); 403 list_add_tail(&entry->obj_list, &uobj->comp_list); 404 spin_unlock_irqrestore(&file->lock, flags); 405 406 wake_up_interruptible(&file->poll_wait); 407 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 408 } 409 410 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 411 __u64 element, __u64 event, 412 struct list_head *obj_list, 413 u32 *counter) 414 { 415 struct ib_uverbs_event *entry; 416 unsigned long flags; 417 418 spin_lock_irqsave(&file->async_file->lock, flags); 419 if (!file->async_file->file) { 420 spin_unlock_irqrestore(&file->async_file->lock, flags); 421 return; 422 } 423 424 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 425 if (!entry) { 426 spin_unlock_irqrestore(&file->async_file->lock, flags); 427 return; 428 } 429 430 entry->desc.async.element = element; 431 entry->desc.async.event_type = event; 432 entry->counter = counter; 433 434 list_add_tail(&entry->list, &file->async_file->event_list); 435 if (obj_list) 436 list_add_tail(&entry->obj_list, obj_list); 437 spin_unlock_irqrestore(&file->async_file->lock, flags); 438 439 wake_up_interruptible(&file->async_file->poll_wait); 440 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 441 } 442 443 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 444 { 445 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 446 struct ib_ucq_object, uobject); 447 448 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 449 event->event, &uobj->async_list, 450 &uobj->async_events_reported); 451 452 } 453 454 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 455 { 456 struct ib_uevent_object *uobj; 457 458 uobj = container_of(event->element.qp->uobject, 459 struct ib_uevent_object, uobject); 460 461 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 462 event->event, &uobj->event_list, 463 &uobj->events_reported); 464 } 465 466 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 467 { 468 struct ib_uevent_object *uobj; 469 470 uobj = container_of(event->element.srq->uobject, 471 struct ib_uevent_object, uobject); 472 473 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 474 event->event, &uobj->event_list, 475 &uobj->events_reported); 476 } 477 478 void ib_uverbs_event_handler(struct ib_event_handler *handler, 479 struct ib_event *event) 480 { 481 struct ib_uverbs_file *file = 482 container_of(handler, struct ib_uverbs_file, event_handler); 483 484 ib_uverbs_async_handler(file, event->element.port_num, event->event, 485 NULL, NULL); 486 } 487 488 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 489 int is_async, int *fd) 490 { 491 struct ib_uverbs_event_file *ev_file; 492 struct file *filp; 493 int ret; 494 495 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 496 if (!ev_file) 497 return ERR_PTR(-ENOMEM); 498 499 kref_init(&ev_file->ref); 500 spin_lock_init(&ev_file->lock); 501 INIT_LIST_HEAD(&ev_file->event_list); 502 init_waitqueue_head(&ev_file->poll_wait); 503 ev_file->uverbs_file = uverbs_file; 504 ev_file->async_queue = NULL; 505 ev_file->is_async = is_async; 506 507 *fd = get_unused_fd(); 508 if (*fd < 0) { 509 ret = *fd; 510 goto err; 511 } 512 513 filp = get_empty_filp(); 514 if (!filp) { 515 ret = -ENFILE; 516 goto err_fd; 517 } 518 519 ev_file->file = filp; 520 521 /* 522 * fops_get() can't fail here, because we're coming from a 523 * system call on a uverbs file, which will already have a 524 * module reference. 525 */ 526 filp->f_op = fops_get(&uverbs_event_fops); 527 filp->f_vfsmnt = mntget(uverbs_event_mnt); 528 filp->f_dentry = dget(uverbs_event_mnt->mnt_root); 529 filp->f_mapping = filp->f_dentry->d_inode->i_mapping; 530 filp->f_flags = O_RDONLY; 531 filp->f_mode = FMODE_READ; 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 init_MUTEX(&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 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 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); 733 734 spin_lock(&map_lock); 735 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 736 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 737 spin_unlock(&map_lock); 738 goto err; 739 } 740 set_bit(uverbs_dev->devnum, dev_map); 741 spin_unlock(&map_lock); 742 743 uverbs_dev->ib_dev = device; 744 uverbs_dev->num_comp_vectors = 1; 745 746 uverbs_dev->dev = cdev_alloc(); 747 if (!uverbs_dev->dev) 748 goto err; 749 uverbs_dev->dev->owner = THIS_MODULE; 750 uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 751 kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum); 752 if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 753 goto err_cdev; 754 755 uverbs_dev->class_dev = class_device_create(uverbs_class, NULL, 756 uverbs_dev->dev->dev, 757 device->dma_device, 758 "uverbs%d", uverbs_dev->devnum); 759 if (IS_ERR(uverbs_dev->class_dev)) 760 goto err_cdev; 761 762 class_set_devdata(uverbs_dev->class_dev, uverbs_dev); 763 764 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev)) 765 goto err_class; 766 if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version)) 767 goto err_class; 768 769 spin_lock(&map_lock); 770 dev_table[uverbs_dev->devnum] = uverbs_dev; 771 spin_unlock(&map_lock); 772 773 ib_set_client_data(device, &uverbs_client, uverbs_dev); 774 775 return; 776 777 err_class: 778 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 779 780 err_cdev: 781 cdev_del(uverbs_dev->dev); 782 clear_bit(uverbs_dev->devnum, dev_map); 783 784 err: 785 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 786 return; 787 } 788 789 static void ib_uverbs_remove_one(struct ib_device *device) 790 { 791 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 792 793 if (!uverbs_dev) 794 return; 795 796 class_set_devdata(uverbs_dev->class_dev, NULL); 797 class_device_destroy(uverbs_class, uverbs_dev->dev->dev); 798 cdev_del(uverbs_dev->dev); 799 800 spin_lock(&map_lock); 801 dev_table[uverbs_dev->devnum] = NULL; 802 spin_unlock(&map_lock); 803 804 clear_bit(uverbs_dev->devnum, dev_map); 805 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 806 } 807 808 static struct super_block *uverbs_event_get_sb(struct file_system_type *fs_type, int flags, 809 const char *dev_name, void *data) 810 { 811 return get_sb_pseudo(fs_type, "infinibandevent:", NULL, 812 INFINIBANDEVENTFS_MAGIC); 813 } 814 815 static struct file_system_type uverbs_event_fs = { 816 /* No owner field so module can be unloaded */ 817 .name = "infinibandeventfs", 818 .get_sb = uverbs_event_get_sb, 819 .kill_sb = kill_litter_super 820 }; 821 822 static int __init ib_uverbs_init(void) 823 { 824 int ret; 825 826 spin_lock_init(&map_lock); 827 828 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 829 "infiniband_verbs"); 830 if (ret) { 831 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 832 goto out; 833 } 834 835 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 836 if (IS_ERR(uverbs_class)) { 837 ret = PTR_ERR(uverbs_class); 838 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 839 goto out_chrdev; 840 } 841 842 ret = class_create_file(uverbs_class, &class_attr_abi_version); 843 if (ret) { 844 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 845 goto out_class; 846 } 847 848 ret = register_filesystem(&uverbs_event_fs); 849 if (ret) { 850 printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); 851 goto out_class; 852 } 853 854 uverbs_event_mnt = kern_mount(&uverbs_event_fs); 855 if (IS_ERR(uverbs_event_mnt)) { 856 ret = PTR_ERR(uverbs_event_mnt); 857 printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); 858 goto out_fs; 859 } 860 861 ret = ib_register_client(&uverbs_client); 862 if (ret) { 863 printk(KERN_ERR "user_verbs: couldn't register client\n"); 864 goto out_mnt; 865 } 866 867 return 0; 868 869 out_mnt: 870 mntput(uverbs_event_mnt); 871 872 out_fs: 873 unregister_filesystem(&uverbs_event_fs); 874 875 out_class: 876 class_destroy(uverbs_class); 877 878 out_chrdev: 879 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 880 881 out: 882 return ret; 883 } 884 885 static void __exit ib_uverbs_cleanup(void) 886 { 887 ib_unregister_client(&uverbs_client); 888 mntput(uverbs_event_mnt); 889 unregister_filesystem(&uverbs_event_fs); 890 class_destroy(uverbs_class); 891 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 892 idr_destroy(&ib_uverbs_pd_idr); 893 idr_destroy(&ib_uverbs_mr_idr); 894 idr_destroy(&ib_uverbs_mw_idr); 895 idr_destroy(&ib_uverbs_ah_idr); 896 idr_destroy(&ib_uverbs_cq_idr); 897 idr_destroy(&ib_uverbs_qp_idr); 898 idr_destroy(&ib_uverbs_srq_idr); 899 } 900 901 module_init(ib_uverbs_init); 902 module_exit(ib_uverbs_cleanup); 903