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 if (file->is_async) { 362 ib_unregister_event_handler(&file->uverbs_file->event_handler); 363 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 364 } 365 kref_put(&file->ref, ib_uverbs_release_event_file); 366 367 return 0; 368 } 369 370 static const struct file_operations uverbs_event_fops = { 371 .owner = THIS_MODULE, 372 .read = ib_uverbs_event_read, 373 .poll = ib_uverbs_event_poll, 374 .release = ib_uverbs_event_close, 375 .fasync = ib_uverbs_event_fasync 376 }; 377 378 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 379 { 380 struct ib_uverbs_event_file *file = cq_context; 381 struct ib_ucq_object *uobj; 382 struct ib_uverbs_event *entry; 383 unsigned long flags; 384 385 if (!file) 386 return; 387 388 spin_lock_irqsave(&file->lock, flags); 389 if (file->is_closed) { 390 spin_unlock_irqrestore(&file->lock, flags); 391 return; 392 } 393 394 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 395 if (!entry) { 396 spin_unlock_irqrestore(&file->lock, flags); 397 return; 398 } 399 400 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 401 402 entry->desc.comp.cq_handle = cq->uobject->user_handle; 403 entry->counter = &uobj->comp_events_reported; 404 405 list_add_tail(&entry->list, &file->event_list); 406 list_add_tail(&entry->obj_list, &uobj->comp_list); 407 spin_unlock_irqrestore(&file->lock, flags); 408 409 wake_up_interruptible(&file->poll_wait); 410 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 411 } 412 413 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 414 __u64 element, __u64 event, 415 struct list_head *obj_list, 416 u32 *counter) 417 { 418 struct ib_uverbs_event *entry; 419 unsigned long flags; 420 421 spin_lock_irqsave(&file->async_file->lock, flags); 422 if (file->async_file->is_closed) { 423 spin_unlock_irqrestore(&file->async_file->lock, flags); 424 return; 425 } 426 427 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 428 if (!entry) { 429 spin_unlock_irqrestore(&file->async_file->lock, flags); 430 return; 431 } 432 433 entry->desc.async.element = element; 434 entry->desc.async.event_type = event; 435 entry->counter = counter; 436 437 list_add_tail(&entry->list, &file->async_file->event_list); 438 if (obj_list) 439 list_add_tail(&entry->obj_list, obj_list); 440 spin_unlock_irqrestore(&file->async_file->lock, flags); 441 442 wake_up_interruptible(&file->async_file->poll_wait); 443 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 444 } 445 446 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 447 { 448 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 449 struct ib_ucq_object, uobject); 450 451 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 452 event->event, &uobj->async_list, 453 &uobj->async_events_reported); 454 } 455 456 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 457 { 458 struct ib_uevent_object *uobj; 459 460 uobj = container_of(event->element.qp->uobject, 461 struct ib_uevent_object, uobject); 462 463 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 464 event->event, &uobj->event_list, 465 &uobj->events_reported); 466 } 467 468 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 469 { 470 struct ib_uevent_object *uobj; 471 472 uobj = container_of(event->element.srq->uobject, 473 struct ib_uevent_object, uobject); 474 475 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 476 event->event, &uobj->event_list, 477 &uobj->events_reported); 478 } 479 480 void ib_uverbs_event_handler(struct ib_event_handler *handler, 481 struct ib_event *event) 482 { 483 struct ib_uverbs_file *file = 484 container_of(handler, struct ib_uverbs_file, event_handler); 485 486 ib_uverbs_async_handler(file, event->element.port_num, event->event, 487 NULL, NULL); 488 } 489 490 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 491 int is_async, int *fd) 492 { 493 struct ib_uverbs_event_file *ev_file; 494 struct file *filp; 495 int ret; 496 497 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 498 if (!ev_file) 499 return ERR_PTR(-ENOMEM); 500 501 kref_init(&ev_file->ref); 502 spin_lock_init(&ev_file->lock); 503 INIT_LIST_HEAD(&ev_file->event_list); 504 init_waitqueue_head(&ev_file->poll_wait); 505 ev_file->uverbs_file = uverbs_file; 506 ev_file->async_queue = NULL; 507 ev_file->is_async = is_async; 508 ev_file->is_closed = 0; 509 510 *fd = get_unused_fd(); 511 if (*fd < 0) { 512 ret = *fd; 513 goto err; 514 } 515 516 /* 517 * fops_get() can't fail here, because we're coming from a 518 * system call on a uverbs file, which will already have a 519 * module reference. 520 */ 521 filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root), 522 FMODE_READ, fops_get(&uverbs_event_fops)); 523 if (!filp) { 524 ret = -ENFILE; 525 goto err_fd; 526 } 527 528 filp->private_data = ev_file; 529 530 return filp; 531 532 err_fd: 533 put_unused_fd(*fd); 534 535 err: 536 kfree(ev_file); 537 return ERR_PTR(ret); 538 } 539 540 /* 541 * Look up a completion event file by FD. If lookup is successful, 542 * takes a ref to the event file struct that it returns; if 543 * unsuccessful, returns NULL. 544 */ 545 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 546 { 547 struct ib_uverbs_event_file *ev_file = NULL; 548 struct file *filp; 549 550 filp = fget(fd); 551 if (!filp) 552 return NULL; 553 554 if (filp->f_op != &uverbs_event_fops) 555 goto out; 556 557 ev_file = filp->private_data; 558 if (ev_file->is_async) { 559 ev_file = NULL; 560 goto out; 561 } 562 563 kref_get(&ev_file->ref); 564 565 out: 566 fput(filp); 567 return ev_file; 568 } 569 570 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 571 size_t count, loff_t *pos) 572 { 573 struct ib_uverbs_file *file = filp->private_data; 574 struct ib_uverbs_cmd_hdr hdr; 575 576 if (count < sizeof hdr) 577 return -EINVAL; 578 579 if (copy_from_user(&hdr, buf, sizeof hdr)) 580 return -EFAULT; 581 582 if (hdr.in_words * 4 != count) 583 return -EINVAL; 584 585 if (hdr.command < 0 || 586 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 587 !uverbs_cmd_table[hdr.command] || 588 !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 589 return -EINVAL; 590 591 if (!file->ucontext && 592 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 593 return -EINVAL; 594 595 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 596 hdr.in_words * 4, hdr.out_words * 4); 597 } 598 599 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 600 { 601 struct ib_uverbs_file *file = filp->private_data; 602 603 if (!file->ucontext) 604 return -ENODEV; 605 else 606 return file->device->ib_dev->mmap(file->ucontext, vma); 607 } 608 609 /* 610 * ib_uverbs_open() does not need the BKL: 611 * 612 * - dev_table[] accesses are protected by map_lock, the 613 * ib_uverbs_device structures are properly reference counted, and 614 * everything else is purely local to the file being created, so 615 * races against other open calls are not a problem; 616 * - there is no ioctl method to race against; 617 * - the device is added to dev_table[] as the last part of module 618 * initialization, the open method will either immediately run 619 * -ENXIO, or all required initialization will be done. 620 */ 621 static int ib_uverbs_open(struct inode *inode, struct file *filp) 622 { 623 struct ib_uverbs_device *dev; 624 struct ib_uverbs_file *file; 625 int ret; 626 627 spin_lock(&map_lock); 628 dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; 629 if (dev) 630 kref_get(&dev->ref); 631 spin_unlock(&map_lock); 632 633 if (!dev) 634 return -ENXIO; 635 636 if (!try_module_get(dev->ib_dev->owner)) { 637 ret = -ENODEV; 638 goto err; 639 } 640 641 file = kmalloc(sizeof *file, GFP_KERNEL); 642 if (!file) { 643 ret = -ENOMEM; 644 goto err_module; 645 } 646 647 file->device = dev; 648 file->ucontext = NULL; 649 file->async_file = NULL; 650 kref_init(&file->ref); 651 mutex_init(&file->mutex); 652 653 filp->private_data = file; 654 655 return 0; 656 657 err_module: 658 module_put(dev->ib_dev->owner); 659 660 err: 661 kref_put(&dev->ref, ib_uverbs_release_dev); 662 return ret; 663 } 664 665 static int ib_uverbs_close(struct inode *inode, struct file *filp) 666 { 667 struct ib_uverbs_file *file = filp->private_data; 668 669 ib_uverbs_cleanup_ucontext(file, file->ucontext); 670 671 if (file->async_file) 672 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 673 674 kref_put(&file->ref, ib_uverbs_release_file); 675 676 return 0; 677 } 678 679 static const struct file_operations uverbs_fops = { 680 .owner = THIS_MODULE, 681 .write = ib_uverbs_write, 682 .open = ib_uverbs_open, 683 .release = ib_uverbs_close 684 }; 685 686 static const struct file_operations uverbs_mmap_fops = { 687 .owner = THIS_MODULE, 688 .write = ib_uverbs_write, 689 .mmap = ib_uverbs_mmap, 690 .open = ib_uverbs_open, 691 .release = ib_uverbs_close 692 }; 693 694 static struct ib_client uverbs_client = { 695 .name = "uverbs", 696 .add = ib_uverbs_add_one, 697 .remove = ib_uverbs_remove_one 698 }; 699 700 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 701 char *buf) 702 { 703 struct ib_uverbs_device *dev = dev_get_drvdata(device); 704 705 if (!dev) 706 return -ENODEV; 707 708 return sprintf(buf, "%s\n", dev->ib_dev->name); 709 } 710 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 711 712 static ssize_t show_dev_abi_version(struct device *device, 713 struct device_attribute *attr, char *buf) 714 { 715 struct ib_uverbs_device *dev = dev_get_drvdata(device); 716 717 if (!dev) 718 return -ENODEV; 719 720 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 721 } 722 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 723 724 static ssize_t show_abi_version(struct class *class, char *buf) 725 { 726 return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); 727 } 728 static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); 729 730 static void ib_uverbs_add_one(struct ib_device *device) 731 { 732 struct ib_uverbs_device *uverbs_dev; 733 734 if (!device->alloc_ucontext) 735 return; 736 737 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 738 if (!uverbs_dev) 739 return; 740 741 kref_init(&uverbs_dev->ref); 742 init_completion(&uverbs_dev->comp); 743 744 spin_lock(&map_lock); 745 uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 746 if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { 747 spin_unlock(&map_lock); 748 goto err; 749 } 750 set_bit(uverbs_dev->devnum, dev_map); 751 spin_unlock(&map_lock); 752 753 uverbs_dev->ib_dev = device; 754 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 755 756 uverbs_dev->cdev = cdev_alloc(); 757 if (!uverbs_dev->cdev) 758 goto err; 759 uverbs_dev->cdev->owner = THIS_MODULE; 760 uverbs_dev->cdev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 761 kobject_set_name(&uverbs_dev->cdev->kobj, "uverbs%d", uverbs_dev->devnum); 762 if (cdev_add(uverbs_dev->cdev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) 763 goto err_cdev; 764 765 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 766 uverbs_dev->cdev->dev, uverbs_dev, 767 "uverbs%d", uverbs_dev->devnum); 768 if (IS_ERR(uverbs_dev->dev)) 769 goto err_cdev; 770 771 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 772 goto err_class; 773 if (device_create_file(uverbs_dev->dev, &dev_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 device_destroy(uverbs_class, uverbs_dev->cdev->dev); 786 787 err_cdev: 788 cdev_del(uverbs_dev->cdev); 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 dev_set_drvdata(uverbs_dev->dev, NULL); 806 device_destroy(uverbs_class, uverbs_dev->cdev->dev); 807 cdev_del(uverbs_dev->cdev); 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