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 DEFINE_IDR(ib_uverbs_xrcd_idr); 76 77 static DEFINE_SPINLOCK(map_lock); 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 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 112 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 113 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 114 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp 115 }; 116 117 static void ib_uverbs_add_one(struct ib_device *device); 118 static void ib_uverbs_remove_one(struct ib_device *device); 119 120 static void ib_uverbs_release_dev(struct kref *ref) 121 { 122 struct ib_uverbs_device *dev = 123 container_of(ref, struct ib_uverbs_device, ref); 124 125 complete(&dev->comp); 126 } 127 128 static void ib_uverbs_release_event_file(struct kref *ref) 129 { 130 struct ib_uverbs_event_file *file = 131 container_of(ref, struct ib_uverbs_event_file, ref); 132 133 kfree(file); 134 } 135 136 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 137 struct ib_uverbs_event_file *ev_file, 138 struct ib_ucq_object *uobj) 139 { 140 struct ib_uverbs_event *evt, *tmp; 141 142 if (ev_file) { 143 spin_lock_irq(&ev_file->lock); 144 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 145 list_del(&evt->list); 146 kfree(evt); 147 } 148 spin_unlock_irq(&ev_file->lock); 149 150 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 151 } 152 153 spin_lock_irq(&file->async_file->lock); 154 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 155 list_del(&evt->list); 156 kfree(evt); 157 } 158 spin_unlock_irq(&file->async_file->lock); 159 } 160 161 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 162 struct ib_uevent_object *uobj) 163 { 164 struct ib_uverbs_event *evt, *tmp; 165 166 spin_lock_irq(&file->async_file->lock); 167 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 168 list_del(&evt->list); 169 kfree(evt); 170 } 171 spin_unlock_irq(&file->async_file->lock); 172 } 173 174 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 175 struct ib_uqp_object *uobj) 176 { 177 struct ib_uverbs_mcast_entry *mcast, *tmp; 178 179 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 180 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 181 list_del(&mcast->list); 182 kfree(mcast); 183 } 184 } 185 186 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 187 struct ib_ucontext *context) 188 { 189 struct ib_uobject *uobj, *tmp; 190 191 if (!context) 192 return 0; 193 194 context->closing = 1; 195 196 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 197 struct ib_ah *ah = uobj->object; 198 199 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 200 ib_destroy_ah(ah); 201 kfree(uobj); 202 } 203 204 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 205 struct ib_qp *qp = uobj->object; 206 struct ib_uqp_object *uqp = 207 container_of(uobj, struct ib_uqp_object, uevent.uobject); 208 209 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 210 if (qp != qp->real_qp) { 211 ib_close_qp(qp); 212 } else { 213 ib_uverbs_detach_umcast(qp, uqp); 214 ib_destroy_qp(qp); 215 } 216 ib_uverbs_release_uevent(file, &uqp->uevent); 217 kfree(uqp); 218 } 219 220 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 221 struct ib_cq *cq = uobj->object; 222 struct ib_uverbs_event_file *ev_file = cq->cq_context; 223 struct ib_ucq_object *ucq = 224 container_of(uobj, struct ib_ucq_object, uobject); 225 226 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 227 ib_destroy_cq(cq); 228 ib_uverbs_release_ucq(file, ev_file, ucq); 229 kfree(ucq); 230 } 231 232 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 233 struct ib_srq *srq = uobj->object; 234 struct ib_uevent_object *uevent = 235 container_of(uobj, struct ib_uevent_object, uobject); 236 237 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 238 ib_destroy_srq(srq); 239 ib_uverbs_release_uevent(file, uevent); 240 kfree(uevent); 241 } 242 243 /* XXX Free MWs */ 244 245 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 246 struct ib_mr *mr = uobj->object; 247 248 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 249 ib_dereg_mr(mr); 250 kfree(uobj); 251 } 252 253 mutex_lock(&file->device->xrcd_tree_mutex); 254 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 255 struct ib_xrcd *xrcd = uobj->object; 256 struct ib_uxrcd_object *uxrcd = 257 container_of(uobj, struct ib_uxrcd_object, uobject); 258 259 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 260 ib_uverbs_dealloc_xrcd(file->device, xrcd); 261 kfree(uxrcd); 262 } 263 mutex_unlock(&file->device->xrcd_tree_mutex); 264 265 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 266 struct ib_pd *pd = uobj->object; 267 268 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 269 ib_dealloc_pd(pd); 270 kfree(uobj); 271 } 272 273 return context->device->dealloc_ucontext(context); 274 } 275 276 static void ib_uverbs_release_file(struct kref *ref) 277 { 278 struct ib_uverbs_file *file = 279 container_of(ref, struct ib_uverbs_file, ref); 280 281 module_put(file->device->ib_dev->owner); 282 kref_put(&file->device->ref, ib_uverbs_release_dev); 283 284 kfree(file); 285 } 286 287 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 288 size_t count, loff_t *pos) 289 { 290 struct ib_uverbs_event_file *file = filp->private_data; 291 struct ib_uverbs_event *event; 292 int eventsz; 293 int ret = 0; 294 295 spin_lock_irq(&file->lock); 296 297 while (list_empty(&file->event_list)) { 298 spin_unlock_irq(&file->lock); 299 300 if (filp->f_flags & O_NONBLOCK) 301 return -EAGAIN; 302 303 if (wait_event_interruptible(file->poll_wait, 304 !list_empty(&file->event_list))) 305 return -ERESTARTSYS; 306 307 spin_lock_irq(&file->lock); 308 } 309 310 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 311 312 if (file->is_async) 313 eventsz = sizeof (struct ib_uverbs_async_event_desc); 314 else 315 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 316 317 if (eventsz > count) { 318 ret = -EINVAL; 319 event = NULL; 320 } else { 321 list_del(file->event_list.next); 322 if (event->counter) { 323 ++(*event->counter); 324 list_del(&event->obj_list); 325 } 326 } 327 328 spin_unlock_irq(&file->lock); 329 330 if (event) { 331 if (copy_to_user(buf, event, eventsz)) 332 ret = -EFAULT; 333 else 334 ret = eventsz; 335 } 336 337 kfree(event); 338 339 return ret; 340 } 341 342 static unsigned int ib_uverbs_event_poll(struct file *filp, 343 struct poll_table_struct *wait) 344 { 345 unsigned int pollflags = 0; 346 struct ib_uverbs_event_file *file = filp->private_data; 347 348 poll_wait(filp, &file->poll_wait, wait); 349 350 spin_lock_irq(&file->lock); 351 if (!list_empty(&file->event_list)) 352 pollflags = POLLIN | POLLRDNORM; 353 spin_unlock_irq(&file->lock); 354 355 return pollflags; 356 } 357 358 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 359 { 360 struct ib_uverbs_event_file *file = filp->private_data; 361 362 return fasync_helper(fd, filp, on, &file->async_queue); 363 } 364 365 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 366 { 367 struct ib_uverbs_event_file *file = filp->private_data; 368 struct ib_uverbs_event *entry, *tmp; 369 370 spin_lock_irq(&file->lock); 371 file->is_closed = 1; 372 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 373 if (entry->counter) 374 list_del(&entry->obj_list); 375 kfree(entry); 376 } 377 spin_unlock_irq(&file->lock); 378 379 if (file->is_async) { 380 ib_unregister_event_handler(&file->uverbs_file->event_handler); 381 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 382 } 383 kref_put(&file->ref, ib_uverbs_release_event_file); 384 385 return 0; 386 } 387 388 static const struct file_operations uverbs_event_fops = { 389 .owner = THIS_MODULE, 390 .read = ib_uverbs_event_read, 391 .poll = ib_uverbs_event_poll, 392 .release = ib_uverbs_event_close, 393 .fasync = ib_uverbs_event_fasync, 394 .llseek = no_llseek, 395 }; 396 397 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 398 { 399 struct ib_uverbs_event_file *file = cq_context; 400 struct ib_ucq_object *uobj; 401 struct ib_uverbs_event *entry; 402 unsigned long flags; 403 404 if (!file) 405 return; 406 407 spin_lock_irqsave(&file->lock, flags); 408 if (file->is_closed) { 409 spin_unlock_irqrestore(&file->lock, flags); 410 return; 411 } 412 413 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 414 if (!entry) { 415 spin_unlock_irqrestore(&file->lock, flags); 416 return; 417 } 418 419 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 420 421 entry->desc.comp.cq_handle = cq->uobject->user_handle; 422 entry->counter = &uobj->comp_events_reported; 423 424 list_add_tail(&entry->list, &file->event_list); 425 list_add_tail(&entry->obj_list, &uobj->comp_list); 426 spin_unlock_irqrestore(&file->lock, flags); 427 428 wake_up_interruptible(&file->poll_wait); 429 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 430 } 431 432 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 433 __u64 element, __u64 event, 434 struct list_head *obj_list, 435 u32 *counter) 436 { 437 struct ib_uverbs_event *entry; 438 unsigned long flags; 439 440 spin_lock_irqsave(&file->async_file->lock, flags); 441 if (file->async_file->is_closed) { 442 spin_unlock_irqrestore(&file->async_file->lock, flags); 443 return; 444 } 445 446 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 447 if (!entry) { 448 spin_unlock_irqrestore(&file->async_file->lock, flags); 449 return; 450 } 451 452 entry->desc.async.element = element; 453 entry->desc.async.event_type = event; 454 entry->counter = counter; 455 456 list_add_tail(&entry->list, &file->async_file->event_list); 457 if (obj_list) 458 list_add_tail(&entry->obj_list, obj_list); 459 spin_unlock_irqrestore(&file->async_file->lock, flags); 460 461 wake_up_interruptible(&file->async_file->poll_wait); 462 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 463 } 464 465 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 466 { 467 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 468 struct ib_ucq_object, uobject); 469 470 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 471 event->event, &uobj->async_list, 472 &uobj->async_events_reported); 473 } 474 475 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 476 { 477 struct ib_uevent_object *uobj; 478 479 uobj = container_of(event->element.qp->uobject, 480 struct ib_uevent_object, uobject); 481 482 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 483 event->event, &uobj->event_list, 484 &uobj->events_reported); 485 } 486 487 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 488 { 489 struct ib_uevent_object *uobj; 490 491 uobj = container_of(event->element.srq->uobject, 492 struct ib_uevent_object, uobject); 493 494 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 495 event->event, &uobj->event_list, 496 &uobj->events_reported); 497 } 498 499 void ib_uverbs_event_handler(struct ib_event_handler *handler, 500 struct ib_event *event) 501 { 502 struct ib_uverbs_file *file = 503 container_of(handler, struct ib_uverbs_file, event_handler); 504 505 ib_uverbs_async_handler(file, event->element.port_num, event->event, 506 NULL, NULL); 507 } 508 509 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 510 int is_async) 511 { 512 struct ib_uverbs_event_file *ev_file; 513 struct file *filp; 514 515 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 516 if (!ev_file) 517 return ERR_PTR(-ENOMEM); 518 519 kref_init(&ev_file->ref); 520 spin_lock_init(&ev_file->lock); 521 INIT_LIST_HEAD(&ev_file->event_list); 522 init_waitqueue_head(&ev_file->poll_wait); 523 ev_file->uverbs_file = uverbs_file; 524 ev_file->async_queue = NULL; 525 ev_file->is_async = is_async; 526 ev_file->is_closed = 0; 527 528 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 529 ev_file, O_RDONLY); 530 if (IS_ERR(filp)) 531 kfree(ev_file); 532 533 return filp; 534 } 535 536 /* 537 * Look up a completion event file by FD. If lookup is successful, 538 * takes a ref to the event file struct that it returns; if 539 * unsuccessful, returns NULL. 540 */ 541 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 542 { 543 struct ib_uverbs_event_file *ev_file = NULL; 544 struct fd f = fdget(fd); 545 546 if (!f.file) 547 return NULL; 548 549 if (f.file->f_op != &uverbs_event_fops) 550 goto out; 551 552 ev_file = f.file->private_data; 553 if (ev_file->is_async) { 554 ev_file = NULL; 555 goto out; 556 } 557 558 kref_get(&ev_file->ref); 559 560 out: 561 fdput(f); 562 return ev_file; 563 } 564 565 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 566 size_t count, loff_t *pos) 567 { 568 struct ib_uverbs_file *file = filp->private_data; 569 struct ib_uverbs_cmd_hdr hdr; 570 571 if (count < sizeof hdr) 572 return -EINVAL; 573 574 if (copy_from_user(&hdr, buf, sizeof hdr)) 575 return -EFAULT; 576 577 if (hdr.in_words * 4 != count) 578 return -EINVAL; 579 580 if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 581 !uverbs_cmd_table[hdr.command]) 582 return -EINVAL; 583 584 if (!file->ucontext && 585 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 586 return -EINVAL; 587 588 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 589 return -ENOSYS; 590 591 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 592 hdr.in_words * 4, hdr.out_words * 4); 593 } 594 595 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 596 { 597 struct ib_uverbs_file *file = filp->private_data; 598 599 if (!file->ucontext) 600 return -ENODEV; 601 else 602 return file->device->ib_dev->mmap(file->ucontext, vma); 603 } 604 605 /* 606 * ib_uverbs_open() does not need the BKL: 607 * 608 * - the ib_uverbs_device structures are properly reference counted and 609 * everything else is purely local to the file being created, so 610 * races against other open calls are not a problem; 611 * - there is no ioctl method to race against; 612 * - the open method will either immediately run -ENXIO, or all 613 * required initialization will be done. 614 */ 615 static int ib_uverbs_open(struct inode *inode, struct file *filp) 616 { 617 struct ib_uverbs_device *dev; 618 struct ib_uverbs_file *file; 619 int ret; 620 621 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 622 if (dev) 623 kref_get(&dev->ref); 624 else 625 return -ENXIO; 626 627 if (!try_module_get(dev->ib_dev->owner)) { 628 ret = -ENODEV; 629 goto err; 630 } 631 632 file = kmalloc(sizeof *file, GFP_KERNEL); 633 if (!file) { 634 ret = -ENOMEM; 635 goto err_module; 636 } 637 638 file->device = dev; 639 file->ucontext = NULL; 640 file->async_file = NULL; 641 kref_init(&file->ref); 642 mutex_init(&file->mutex); 643 644 filp->private_data = file; 645 646 return nonseekable_open(inode, filp); 647 648 err_module: 649 module_put(dev->ib_dev->owner); 650 651 err: 652 kref_put(&dev->ref, ib_uverbs_release_dev); 653 return ret; 654 } 655 656 static int ib_uverbs_close(struct inode *inode, struct file *filp) 657 { 658 struct ib_uverbs_file *file = filp->private_data; 659 660 ib_uverbs_cleanup_ucontext(file, file->ucontext); 661 662 if (file->async_file) 663 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 664 665 kref_put(&file->ref, ib_uverbs_release_file); 666 667 return 0; 668 } 669 670 static const struct file_operations uverbs_fops = { 671 .owner = THIS_MODULE, 672 .write = ib_uverbs_write, 673 .open = ib_uverbs_open, 674 .release = ib_uverbs_close, 675 .llseek = no_llseek, 676 }; 677 678 static const struct file_operations uverbs_mmap_fops = { 679 .owner = THIS_MODULE, 680 .write = ib_uverbs_write, 681 .mmap = ib_uverbs_mmap, 682 .open = ib_uverbs_open, 683 .release = ib_uverbs_close, 684 .llseek = no_llseek, 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 device *device, struct device_attribute *attr, 694 char *buf) 695 { 696 struct ib_uverbs_device *dev = dev_get_drvdata(device); 697 698 if (!dev) 699 return -ENODEV; 700 701 return sprintf(buf, "%s\n", dev->ib_dev->name); 702 } 703 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 704 705 static ssize_t show_dev_abi_version(struct device *device, 706 struct device_attribute *attr, char *buf) 707 { 708 struct ib_uverbs_device *dev = dev_get_drvdata(device); 709 710 if (!dev) 711 return -ENODEV; 712 713 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 714 } 715 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 716 717 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 718 __stringify(IB_USER_VERBS_ABI_VERSION)); 719 720 static dev_t overflow_maj; 721 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 722 723 /* 724 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 725 * requesting a new major number and doubling the number of max devices we 726 * support. It's stupid, but simple. 727 */ 728 static int find_overflow_devnum(void) 729 { 730 int ret; 731 732 if (!overflow_maj) { 733 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 734 "infiniband_verbs"); 735 if (ret) { 736 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 737 return ret; 738 } 739 } 740 741 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 742 if (ret >= IB_UVERBS_MAX_DEVICES) 743 return -1; 744 745 return ret; 746 } 747 748 static void ib_uverbs_add_one(struct ib_device *device) 749 { 750 int devnum; 751 dev_t base; 752 struct ib_uverbs_device *uverbs_dev; 753 754 if (!device->alloc_ucontext) 755 return; 756 757 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 758 if (!uverbs_dev) 759 return; 760 761 kref_init(&uverbs_dev->ref); 762 init_completion(&uverbs_dev->comp); 763 uverbs_dev->xrcd_tree = RB_ROOT; 764 mutex_init(&uverbs_dev->xrcd_tree_mutex); 765 766 spin_lock(&map_lock); 767 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 768 if (devnum >= IB_UVERBS_MAX_DEVICES) { 769 spin_unlock(&map_lock); 770 devnum = find_overflow_devnum(); 771 if (devnum < 0) 772 goto err; 773 774 spin_lock(&map_lock); 775 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 776 base = devnum + overflow_maj; 777 set_bit(devnum, overflow_map); 778 } else { 779 uverbs_dev->devnum = devnum; 780 base = devnum + IB_UVERBS_BASE_DEV; 781 set_bit(devnum, dev_map); 782 } 783 spin_unlock(&map_lock); 784 785 uverbs_dev->ib_dev = device; 786 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 787 788 cdev_init(&uverbs_dev->cdev, NULL); 789 uverbs_dev->cdev.owner = THIS_MODULE; 790 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 791 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 792 if (cdev_add(&uverbs_dev->cdev, base, 1)) 793 goto err_cdev; 794 795 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 796 uverbs_dev->cdev.dev, uverbs_dev, 797 "uverbs%d", uverbs_dev->devnum); 798 if (IS_ERR(uverbs_dev->dev)) 799 goto err_cdev; 800 801 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 802 goto err_class; 803 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 804 goto err_class; 805 806 ib_set_client_data(device, &uverbs_client, uverbs_dev); 807 808 return; 809 810 err_class: 811 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 812 813 err_cdev: 814 cdev_del(&uverbs_dev->cdev); 815 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 816 clear_bit(devnum, dev_map); 817 else 818 clear_bit(devnum, overflow_map); 819 820 err: 821 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 822 wait_for_completion(&uverbs_dev->comp); 823 kfree(uverbs_dev); 824 return; 825 } 826 827 static void ib_uverbs_remove_one(struct ib_device *device) 828 { 829 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 830 831 if (!uverbs_dev) 832 return; 833 834 dev_set_drvdata(uverbs_dev->dev, NULL); 835 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 836 cdev_del(&uverbs_dev->cdev); 837 838 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 839 clear_bit(uverbs_dev->devnum, dev_map); 840 else 841 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 842 843 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 844 wait_for_completion(&uverbs_dev->comp); 845 kfree(uverbs_dev); 846 } 847 848 static char *uverbs_devnode(struct device *dev, umode_t *mode) 849 { 850 if (mode) 851 *mode = 0666; 852 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 853 } 854 855 static int __init ib_uverbs_init(void) 856 { 857 int ret; 858 859 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 860 "infiniband_verbs"); 861 if (ret) { 862 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 863 goto out; 864 } 865 866 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 867 if (IS_ERR(uverbs_class)) { 868 ret = PTR_ERR(uverbs_class); 869 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 870 goto out_chrdev; 871 } 872 873 uverbs_class->devnode = uverbs_devnode; 874 875 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 876 if (ret) { 877 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 878 goto out_class; 879 } 880 881 ret = ib_register_client(&uverbs_client); 882 if (ret) { 883 printk(KERN_ERR "user_verbs: couldn't register client\n"); 884 goto out_class; 885 } 886 887 return 0; 888 889 out_class: 890 class_destroy(uverbs_class); 891 892 out_chrdev: 893 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 894 895 out: 896 return ret; 897 } 898 899 static void __exit ib_uverbs_cleanup(void) 900 { 901 ib_unregister_client(&uverbs_client); 902 class_destroy(uverbs_class); 903 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 904 if (overflow_maj) 905 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 906 idr_destroy(&ib_uverbs_pd_idr); 907 idr_destroy(&ib_uverbs_mr_idr); 908 idr_destroy(&ib_uverbs_mw_idr); 909 idr_destroy(&ib_uverbs_ah_idr); 910 idr_destroy(&ib_uverbs_cq_idr); 911 idr_destroy(&ib_uverbs_qp_idr); 912 idr_destroy(&ib_uverbs_srq_idr); 913 } 914 915 module_init(ib_uverbs_init); 916 module_exit(ib_uverbs_cleanup); 917