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/sched.h> 44 #include <linux/file.h> 45 #include <linux/cdev.h> 46 #include <linux/anon_inodes.h> 47 #include <linux/slab.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 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 DEFINE_SPINLOCK(map_lock); 77 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 78 79 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 80 const char __user *buf, int in_len, 81 int out_len) = { 82 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 83 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 84 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 85 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 86 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 87 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 88 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 89 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 90 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 91 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 92 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 93 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 94 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 95 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 96 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 97 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 98 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 99 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 100 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 101 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 102 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 103 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 104 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 105 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 106 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 107 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 108 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 109 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 110 }; 111 112 static void ib_uverbs_add_one(struct ib_device *device); 113 static void ib_uverbs_remove_one(struct ib_device *device); 114 115 static void ib_uverbs_release_dev(struct kref *ref) 116 { 117 struct ib_uverbs_device *dev = 118 container_of(ref, struct ib_uverbs_device, ref); 119 120 complete(&dev->comp); 121 } 122 123 static void ib_uverbs_release_event_file(struct kref *ref) 124 { 125 struct ib_uverbs_event_file *file = 126 container_of(ref, struct ib_uverbs_event_file, ref); 127 128 kfree(file); 129 } 130 131 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 132 struct ib_uverbs_event_file *ev_file, 133 struct ib_ucq_object *uobj) 134 { 135 struct ib_uverbs_event *evt, *tmp; 136 137 if (ev_file) { 138 spin_lock_irq(&ev_file->lock); 139 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 140 list_del(&evt->list); 141 kfree(evt); 142 } 143 spin_unlock_irq(&ev_file->lock); 144 145 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 146 } 147 148 spin_lock_irq(&file->async_file->lock); 149 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 150 list_del(&evt->list); 151 kfree(evt); 152 } 153 spin_unlock_irq(&file->async_file->lock); 154 } 155 156 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 157 struct ib_uevent_object *uobj) 158 { 159 struct ib_uverbs_event *evt, *tmp; 160 161 spin_lock_irq(&file->async_file->lock); 162 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 163 list_del(&evt->list); 164 kfree(evt); 165 } 166 spin_unlock_irq(&file->async_file->lock); 167 } 168 169 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 170 struct ib_uqp_object *uobj) 171 { 172 struct ib_uverbs_mcast_entry *mcast, *tmp; 173 174 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 175 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 176 list_del(&mcast->list); 177 kfree(mcast); 178 } 179 } 180 181 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 182 struct ib_ucontext *context) 183 { 184 struct ib_uobject *uobj, *tmp; 185 186 if (!context) 187 return 0; 188 189 context->closing = 1; 190 191 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 192 struct ib_ah *ah = uobj->object; 193 194 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 195 ib_destroy_ah(ah); 196 kfree(uobj); 197 } 198 199 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 200 struct ib_qp *qp = uobj->object; 201 struct ib_uqp_object *uqp = 202 container_of(uobj, struct ib_uqp_object, uevent.uobject); 203 204 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 205 ib_uverbs_detach_umcast(qp, uqp); 206 ib_destroy_qp(qp); 207 ib_uverbs_release_uevent(file, &uqp->uevent); 208 kfree(uqp); 209 } 210 211 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 212 struct ib_cq *cq = uobj->object; 213 struct ib_uverbs_event_file *ev_file = cq->cq_context; 214 struct ib_ucq_object *ucq = 215 container_of(uobj, struct ib_ucq_object, uobject); 216 217 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 218 ib_destroy_cq(cq); 219 ib_uverbs_release_ucq(file, ev_file, ucq); 220 kfree(ucq); 221 } 222 223 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 224 struct ib_srq *srq = uobj->object; 225 struct ib_uevent_object *uevent = 226 container_of(uobj, struct ib_uevent_object, uobject); 227 228 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 229 ib_destroy_srq(srq); 230 ib_uverbs_release_uevent(file, uevent); 231 kfree(uevent); 232 } 233 234 /* XXX Free MWs */ 235 236 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 237 struct ib_mr *mr = uobj->object; 238 239 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 240 ib_dereg_mr(mr); 241 kfree(uobj); 242 } 243 244 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 245 struct ib_pd *pd = uobj->object; 246 247 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 248 ib_dealloc_pd(pd); 249 kfree(uobj); 250 } 251 252 return context->device->dealloc_ucontext(context); 253 } 254 255 static void ib_uverbs_release_file(struct kref *ref) 256 { 257 struct ib_uverbs_file *file = 258 container_of(ref, struct ib_uverbs_file, ref); 259 260 module_put(file->device->ib_dev->owner); 261 kref_put(&file->device->ref, ib_uverbs_release_dev); 262 263 kfree(file); 264 } 265 266 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 267 size_t count, loff_t *pos) 268 { 269 struct ib_uverbs_event_file *file = filp->private_data; 270 struct ib_uverbs_event *event; 271 int eventsz; 272 int ret = 0; 273 274 spin_lock_irq(&file->lock); 275 276 while (list_empty(&file->event_list)) { 277 spin_unlock_irq(&file->lock); 278 279 if (filp->f_flags & O_NONBLOCK) 280 return -EAGAIN; 281 282 if (wait_event_interruptible(file->poll_wait, 283 !list_empty(&file->event_list))) 284 return -ERESTARTSYS; 285 286 spin_lock_irq(&file->lock); 287 } 288 289 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 290 291 if (file->is_async) 292 eventsz = sizeof (struct ib_uverbs_async_event_desc); 293 else 294 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 295 296 if (eventsz > count) { 297 ret = -EINVAL; 298 event = NULL; 299 } else { 300 list_del(file->event_list.next); 301 if (event->counter) { 302 ++(*event->counter); 303 list_del(&event->obj_list); 304 } 305 } 306 307 spin_unlock_irq(&file->lock); 308 309 if (event) { 310 if (copy_to_user(buf, event, eventsz)) 311 ret = -EFAULT; 312 else 313 ret = eventsz; 314 } 315 316 kfree(event); 317 318 return ret; 319 } 320 321 static unsigned int ib_uverbs_event_poll(struct file *filp, 322 struct poll_table_struct *wait) 323 { 324 unsigned int pollflags = 0; 325 struct ib_uverbs_event_file *file = filp->private_data; 326 327 poll_wait(filp, &file->poll_wait, wait); 328 329 spin_lock_irq(&file->lock); 330 if (!list_empty(&file->event_list)) 331 pollflags = POLLIN | POLLRDNORM; 332 spin_unlock_irq(&file->lock); 333 334 return pollflags; 335 } 336 337 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 338 { 339 struct ib_uverbs_event_file *file = filp->private_data; 340 341 return fasync_helper(fd, filp, on, &file->async_queue); 342 } 343 344 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 345 { 346 struct ib_uverbs_event_file *file = filp->private_data; 347 struct ib_uverbs_event *entry, *tmp; 348 349 spin_lock_irq(&file->lock); 350 file->is_closed = 1; 351 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 352 if (entry->counter) 353 list_del(&entry->obj_list); 354 kfree(entry); 355 } 356 spin_unlock_irq(&file->lock); 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 const 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 .llseek = no_llseek, 374 }; 375 376 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 377 { 378 struct ib_uverbs_event_file *file = cq_context; 379 struct ib_ucq_object *uobj; 380 struct ib_uverbs_event *entry; 381 unsigned long flags; 382 383 if (!file) 384 return; 385 386 spin_lock_irqsave(&file->lock, flags); 387 if (file->is_closed) { 388 spin_unlock_irqrestore(&file->lock, flags); 389 return; 390 } 391 392 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 393 if (!entry) { 394 spin_unlock_irqrestore(&file->lock, flags); 395 return; 396 } 397 398 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 399 400 entry->desc.comp.cq_handle = cq->uobject->user_handle; 401 entry->counter = &uobj->comp_events_reported; 402 403 list_add_tail(&entry->list, &file->event_list); 404 list_add_tail(&entry->obj_list, &uobj->comp_list); 405 spin_unlock_irqrestore(&file->lock, flags); 406 407 wake_up_interruptible(&file->poll_wait); 408 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 409 } 410 411 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 412 __u64 element, __u64 event, 413 struct list_head *obj_list, 414 u32 *counter) 415 { 416 struct ib_uverbs_event *entry; 417 unsigned long flags; 418 419 spin_lock_irqsave(&file->async_file->lock, flags); 420 if (file->async_file->is_closed) { 421 spin_unlock_irqrestore(&file->async_file->lock, flags); 422 return; 423 } 424 425 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 426 if (!entry) { 427 spin_unlock_irqrestore(&file->async_file->lock, flags); 428 return; 429 } 430 431 entry->desc.async.element = element; 432 entry->desc.async.event_type = event; 433 entry->counter = counter; 434 435 list_add_tail(&entry->list, &file->async_file->event_list); 436 if (obj_list) 437 list_add_tail(&entry->obj_list, obj_list); 438 spin_unlock_irqrestore(&file->async_file->lock, flags); 439 440 wake_up_interruptible(&file->async_file->poll_wait); 441 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 442 } 443 444 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 445 { 446 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 447 struct ib_ucq_object, uobject); 448 449 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 450 event->event, &uobj->async_list, 451 &uobj->async_events_reported); 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) 490 { 491 struct ib_uverbs_event_file *ev_file; 492 struct file *filp; 493 494 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 495 if (!ev_file) 496 return ERR_PTR(-ENOMEM); 497 498 kref_init(&ev_file->ref); 499 spin_lock_init(&ev_file->lock); 500 INIT_LIST_HEAD(&ev_file->event_list); 501 init_waitqueue_head(&ev_file->poll_wait); 502 ev_file->uverbs_file = uverbs_file; 503 ev_file->async_queue = NULL; 504 ev_file->is_async = is_async; 505 ev_file->is_closed = 0; 506 507 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 508 ev_file, O_RDONLY); 509 if (IS_ERR(filp)) 510 kfree(ev_file); 511 512 return filp; 513 } 514 515 /* 516 * Look up a completion event file by FD. If lookup is successful, 517 * takes a ref to the event file struct that it returns; if 518 * unsuccessful, returns NULL. 519 */ 520 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 521 { 522 struct ib_uverbs_event_file *ev_file = NULL; 523 struct file *filp; 524 525 filp = fget(fd); 526 if (!filp) 527 return NULL; 528 529 if (filp->f_op != &uverbs_event_fops) 530 goto out; 531 532 ev_file = filp->private_data; 533 if (ev_file->is_async) { 534 ev_file = NULL; 535 goto out; 536 } 537 538 kref_get(&ev_file->ref); 539 540 out: 541 fput(filp); 542 return ev_file; 543 } 544 545 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 546 size_t count, loff_t *pos) 547 { 548 struct ib_uverbs_file *file = filp->private_data; 549 struct ib_uverbs_cmd_hdr hdr; 550 551 if (count < sizeof hdr) 552 return -EINVAL; 553 554 if (copy_from_user(&hdr, buf, sizeof hdr)) 555 return -EFAULT; 556 557 if (hdr.in_words * 4 != count) 558 return -EINVAL; 559 560 if (hdr.command < 0 || 561 hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 562 !uverbs_cmd_table[hdr.command]) 563 return -EINVAL; 564 565 if (!file->ucontext && 566 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 567 return -EINVAL; 568 569 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 570 return -ENOSYS; 571 572 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 573 hdr.in_words * 4, hdr.out_words * 4); 574 } 575 576 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 577 { 578 struct ib_uverbs_file *file = filp->private_data; 579 580 if (!file->ucontext) 581 return -ENODEV; 582 else 583 return file->device->ib_dev->mmap(file->ucontext, vma); 584 } 585 586 /* 587 * ib_uverbs_open() does not need the BKL: 588 * 589 * - the ib_uverbs_device structures are properly reference counted and 590 * everything else is purely local to the file being created, so 591 * races against other open calls are not a problem; 592 * - there is no ioctl method to race against; 593 * - the open method will either immediately run -ENXIO, or all 594 * required initialization will be done. 595 */ 596 static int ib_uverbs_open(struct inode *inode, struct file *filp) 597 { 598 struct ib_uverbs_device *dev; 599 struct ib_uverbs_file *file; 600 int ret; 601 602 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 603 if (dev) 604 kref_get(&dev->ref); 605 else 606 return -ENXIO; 607 608 if (!try_module_get(dev->ib_dev->owner)) { 609 ret = -ENODEV; 610 goto err; 611 } 612 613 file = kmalloc(sizeof *file, GFP_KERNEL); 614 if (!file) { 615 ret = -ENOMEM; 616 goto err_module; 617 } 618 619 file->device = dev; 620 file->ucontext = NULL; 621 file->async_file = NULL; 622 kref_init(&file->ref); 623 mutex_init(&file->mutex); 624 625 filp->private_data = file; 626 627 return nonseekable_open(inode, filp); 628 629 err_module: 630 module_put(dev->ib_dev->owner); 631 632 err: 633 kref_put(&dev->ref, ib_uverbs_release_dev); 634 return ret; 635 } 636 637 static int ib_uverbs_close(struct inode *inode, struct file *filp) 638 { 639 struct ib_uverbs_file *file = filp->private_data; 640 641 ib_uverbs_cleanup_ucontext(file, file->ucontext); 642 643 if (file->async_file) 644 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 645 646 kref_put(&file->ref, ib_uverbs_release_file); 647 648 return 0; 649 } 650 651 static const struct file_operations uverbs_fops = { 652 .owner = THIS_MODULE, 653 .write = ib_uverbs_write, 654 .open = ib_uverbs_open, 655 .release = ib_uverbs_close, 656 .llseek = no_llseek, 657 }; 658 659 static const struct file_operations uverbs_mmap_fops = { 660 .owner = THIS_MODULE, 661 .write = ib_uverbs_write, 662 .mmap = ib_uverbs_mmap, 663 .open = ib_uverbs_open, 664 .release = ib_uverbs_close, 665 .llseek = no_llseek, 666 }; 667 668 static struct ib_client uverbs_client = { 669 .name = "uverbs", 670 .add = ib_uverbs_add_one, 671 .remove = ib_uverbs_remove_one 672 }; 673 674 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 675 char *buf) 676 { 677 struct ib_uverbs_device *dev = dev_get_drvdata(device); 678 679 if (!dev) 680 return -ENODEV; 681 682 return sprintf(buf, "%s\n", dev->ib_dev->name); 683 } 684 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 685 686 static ssize_t show_dev_abi_version(struct device *device, 687 struct device_attribute *attr, char *buf) 688 { 689 struct ib_uverbs_device *dev = dev_get_drvdata(device); 690 691 if (!dev) 692 return -ENODEV; 693 694 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 695 } 696 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 697 698 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 699 __stringify(IB_USER_VERBS_ABI_VERSION)); 700 701 static dev_t overflow_maj; 702 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 703 704 /* 705 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 706 * requesting a new major number and doubling the number of max devices we 707 * support. It's stupid, but simple. 708 */ 709 static int find_overflow_devnum(void) 710 { 711 int ret; 712 713 if (!overflow_maj) { 714 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 715 "infiniband_verbs"); 716 if (ret) { 717 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 718 return ret; 719 } 720 } 721 722 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 723 if (ret >= IB_UVERBS_MAX_DEVICES) 724 return -1; 725 726 return ret; 727 } 728 729 static void ib_uverbs_add_one(struct ib_device *device) 730 { 731 int devnum; 732 dev_t base; 733 struct ib_uverbs_device *uverbs_dev; 734 735 if (!device->alloc_ucontext) 736 return; 737 738 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 739 if (!uverbs_dev) 740 return; 741 742 kref_init(&uverbs_dev->ref); 743 init_completion(&uverbs_dev->comp); 744 745 spin_lock(&map_lock); 746 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 747 if (devnum >= IB_UVERBS_MAX_DEVICES) { 748 spin_unlock(&map_lock); 749 devnum = find_overflow_devnum(); 750 if (devnum < 0) 751 goto err; 752 753 spin_lock(&map_lock); 754 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 755 base = devnum + overflow_maj; 756 set_bit(devnum, overflow_map); 757 } else { 758 uverbs_dev->devnum = devnum; 759 base = devnum + IB_UVERBS_BASE_DEV; 760 set_bit(devnum, dev_map); 761 } 762 spin_unlock(&map_lock); 763 764 uverbs_dev->ib_dev = device; 765 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 766 767 cdev_init(&uverbs_dev->cdev, NULL); 768 uverbs_dev->cdev.owner = THIS_MODULE; 769 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 770 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 771 if (cdev_add(&uverbs_dev->cdev, base, 1)) 772 goto err_cdev; 773 774 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 775 uverbs_dev->cdev.dev, uverbs_dev, 776 "uverbs%d", uverbs_dev->devnum); 777 if (IS_ERR(uverbs_dev->dev)) 778 goto err_cdev; 779 780 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 781 goto err_class; 782 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 783 goto err_class; 784 785 ib_set_client_data(device, &uverbs_client, uverbs_dev); 786 787 return; 788 789 err_class: 790 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 791 792 err_cdev: 793 cdev_del(&uverbs_dev->cdev); 794 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 795 clear_bit(devnum, dev_map); 796 else 797 clear_bit(devnum, overflow_map); 798 799 err: 800 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 801 wait_for_completion(&uverbs_dev->comp); 802 kfree(uverbs_dev); 803 return; 804 } 805 806 static void ib_uverbs_remove_one(struct ib_device *device) 807 { 808 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 809 810 if (!uverbs_dev) 811 return; 812 813 dev_set_drvdata(uverbs_dev->dev, NULL); 814 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 815 cdev_del(&uverbs_dev->cdev); 816 817 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 818 clear_bit(uverbs_dev->devnum, dev_map); 819 else 820 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 821 822 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 823 wait_for_completion(&uverbs_dev->comp); 824 kfree(uverbs_dev); 825 } 826 827 static int __init ib_uverbs_init(void) 828 { 829 int ret; 830 831 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 832 "infiniband_verbs"); 833 if (ret) { 834 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 835 goto out; 836 } 837 838 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 839 if (IS_ERR(uverbs_class)) { 840 ret = PTR_ERR(uverbs_class); 841 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 842 goto out_chrdev; 843 } 844 845 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 846 if (ret) { 847 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 848 goto out_class; 849 } 850 851 ret = ib_register_client(&uverbs_client); 852 if (ret) { 853 printk(KERN_ERR "user_verbs: couldn't register client\n"); 854 goto out_class; 855 } 856 857 return 0; 858 859 out_class: 860 class_destroy(uverbs_class); 861 862 out_chrdev: 863 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 864 865 out: 866 return ret; 867 } 868 869 static void __exit ib_uverbs_cleanup(void) 870 { 871 ib_unregister_client(&uverbs_client); 872 class_destroy(uverbs_class); 873 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 874 if (overflow_maj) 875 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 876 idr_destroy(&ib_uverbs_pd_idr); 877 idr_destroy(&ib_uverbs_mr_idr); 878 idr_destroy(&ib_uverbs_mw_idr); 879 idr_destroy(&ib_uverbs_ah_idr); 880 idr_destroy(&ib_uverbs_cq_idr); 881 idr_destroy(&ib_uverbs_qp_idr); 882 idr_destroy(&ib_uverbs_srq_idr); 883 } 884 885 module_init(ib_uverbs_init); 886 module_exit(ib_uverbs_cleanup); 887