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 file *filp; 545 546 filp = fget(fd); 547 if (!filp) 548 return NULL; 549 550 if (filp->f_op != &uverbs_event_fops) 551 goto out; 552 553 ev_file = filp->private_data; 554 if (ev_file->is_async) { 555 ev_file = NULL; 556 goto out; 557 } 558 559 kref_get(&ev_file->ref); 560 561 out: 562 fput(filp); 563 return ev_file; 564 } 565 566 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 567 size_t count, loff_t *pos) 568 { 569 struct ib_uverbs_file *file = filp->private_data; 570 struct ib_uverbs_cmd_hdr hdr; 571 572 if (count < sizeof hdr) 573 return -EINVAL; 574 575 if (copy_from_user(&hdr, buf, sizeof hdr)) 576 return -EFAULT; 577 578 if (hdr.in_words * 4 != count) 579 return -EINVAL; 580 581 if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 582 !uverbs_cmd_table[hdr.command]) 583 return -EINVAL; 584 585 if (!file->ucontext && 586 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 587 return -EINVAL; 588 589 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 590 return -ENOSYS; 591 592 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 593 hdr.in_words * 4, hdr.out_words * 4); 594 } 595 596 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 597 { 598 struct ib_uverbs_file *file = filp->private_data; 599 600 if (!file->ucontext) 601 return -ENODEV; 602 else 603 return file->device->ib_dev->mmap(file->ucontext, vma); 604 } 605 606 /* 607 * ib_uverbs_open() does not need the BKL: 608 * 609 * - the ib_uverbs_device structures are properly reference counted and 610 * everything else is purely local to the file being created, so 611 * races against other open calls are not a problem; 612 * - there is no ioctl method to race against; 613 * - the open method will either immediately run -ENXIO, or all 614 * required initialization will be done. 615 */ 616 static int ib_uverbs_open(struct inode *inode, struct file *filp) 617 { 618 struct ib_uverbs_device *dev; 619 struct ib_uverbs_file *file; 620 int ret; 621 622 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 623 if (dev) 624 kref_get(&dev->ref); 625 else 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 mutex_init(&file->mutex); 644 645 filp->private_data = file; 646 647 return nonseekable_open(inode, filp); 648 649 err_module: 650 module_put(dev->ib_dev->owner); 651 652 err: 653 kref_put(&dev->ref, ib_uverbs_release_dev); 654 return ret; 655 } 656 657 static int ib_uverbs_close(struct inode *inode, struct file *filp) 658 { 659 struct ib_uverbs_file *file = filp->private_data; 660 661 ib_uverbs_cleanup_ucontext(file, file->ucontext); 662 663 if (file->async_file) 664 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 665 666 kref_put(&file->ref, ib_uverbs_release_file); 667 668 return 0; 669 } 670 671 static const struct file_operations uverbs_fops = { 672 .owner = THIS_MODULE, 673 .write = ib_uverbs_write, 674 .open = ib_uverbs_open, 675 .release = ib_uverbs_close, 676 .llseek = no_llseek, 677 }; 678 679 static const 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 .llseek = no_llseek, 686 }; 687 688 static struct ib_client uverbs_client = { 689 .name = "uverbs", 690 .add = ib_uverbs_add_one, 691 .remove = ib_uverbs_remove_one 692 }; 693 694 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 695 char *buf) 696 { 697 struct ib_uverbs_device *dev = dev_get_drvdata(device); 698 699 if (!dev) 700 return -ENODEV; 701 702 return sprintf(buf, "%s\n", dev->ib_dev->name); 703 } 704 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 705 706 static ssize_t show_dev_abi_version(struct device *device, 707 struct device_attribute *attr, char *buf) 708 { 709 struct ib_uverbs_device *dev = dev_get_drvdata(device); 710 711 if (!dev) 712 return -ENODEV; 713 714 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 715 } 716 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 717 718 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 719 __stringify(IB_USER_VERBS_ABI_VERSION)); 720 721 static dev_t overflow_maj; 722 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 723 724 /* 725 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 726 * requesting a new major number and doubling the number of max devices we 727 * support. It's stupid, but simple. 728 */ 729 static int find_overflow_devnum(void) 730 { 731 int ret; 732 733 if (!overflow_maj) { 734 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 735 "infiniband_verbs"); 736 if (ret) { 737 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 738 return ret; 739 } 740 } 741 742 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 743 if (ret >= IB_UVERBS_MAX_DEVICES) 744 return -1; 745 746 return ret; 747 } 748 749 static void ib_uverbs_add_one(struct ib_device *device) 750 { 751 int devnum; 752 dev_t base; 753 struct ib_uverbs_device *uverbs_dev; 754 755 if (!device->alloc_ucontext) 756 return; 757 758 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 759 if (!uverbs_dev) 760 return; 761 762 kref_init(&uverbs_dev->ref); 763 init_completion(&uverbs_dev->comp); 764 uverbs_dev->xrcd_tree = RB_ROOT; 765 mutex_init(&uverbs_dev->xrcd_tree_mutex); 766 767 spin_lock(&map_lock); 768 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 769 if (devnum >= IB_UVERBS_MAX_DEVICES) { 770 spin_unlock(&map_lock); 771 devnum = find_overflow_devnum(); 772 if (devnum < 0) 773 goto err; 774 775 spin_lock(&map_lock); 776 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 777 base = devnum + overflow_maj; 778 set_bit(devnum, overflow_map); 779 } else { 780 uverbs_dev->devnum = devnum; 781 base = devnum + IB_UVERBS_BASE_DEV; 782 set_bit(devnum, dev_map); 783 } 784 spin_unlock(&map_lock); 785 786 uverbs_dev->ib_dev = device; 787 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 788 789 cdev_init(&uverbs_dev->cdev, NULL); 790 uverbs_dev->cdev.owner = THIS_MODULE; 791 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 792 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 793 if (cdev_add(&uverbs_dev->cdev, base, 1)) 794 goto err_cdev; 795 796 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 797 uverbs_dev->cdev.dev, uverbs_dev, 798 "uverbs%d", uverbs_dev->devnum); 799 if (IS_ERR(uverbs_dev->dev)) 800 goto err_cdev; 801 802 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 803 goto err_class; 804 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 805 goto err_class; 806 807 ib_set_client_data(device, &uverbs_client, uverbs_dev); 808 809 return; 810 811 err_class: 812 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 813 814 err_cdev: 815 cdev_del(&uverbs_dev->cdev); 816 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 817 clear_bit(devnum, dev_map); 818 else 819 clear_bit(devnum, overflow_map); 820 821 err: 822 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 823 wait_for_completion(&uverbs_dev->comp); 824 kfree(uverbs_dev); 825 return; 826 } 827 828 static void ib_uverbs_remove_one(struct ib_device *device) 829 { 830 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 831 832 if (!uverbs_dev) 833 return; 834 835 dev_set_drvdata(uverbs_dev->dev, NULL); 836 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 837 cdev_del(&uverbs_dev->cdev); 838 839 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 840 clear_bit(uverbs_dev->devnum, dev_map); 841 else 842 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 843 844 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 845 wait_for_completion(&uverbs_dev->comp); 846 kfree(uverbs_dev); 847 } 848 849 static char *uverbs_devnode(struct device *dev, mode_t *mode) 850 { 851 if (mode) 852 *mode = 0666; 853 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 854 } 855 856 static int __init ib_uverbs_init(void) 857 { 858 int ret; 859 860 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 861 "infiniband_verbs"); 862 if (ret) { 863 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 864 goto out; 865 } 866 867 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 868 if (IS_ERR(uverbs_class)) { 869 ret = PTR_ERR(uverbs_class); 870 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 871 goto out_chrdev; 872 } 873 874 uverbs_class->devnode = uverbs_devnode; 875 876 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 877 if (ret) { 878 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 879 goto out_class; 880 } 881 882 ret = ib_register_client(&uverbs_client); 883 if (ret) { 884 printk(KERN_ERR "user_verbs: couldn't register client\n"); 885 goto out_class; 886 } 887 888 return 0; 889 890 out_class: 891 class_destroy(uverbs_class); 892 893 out_chrdev: 894 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 895 896 out: 897 return ret; 898 } 899 900 static void __exit ib_uverbs_cleanup(void) 901 { 902 ib_unregister_client(&uverbs_client); 903 class_destroy(uverbs_class); 904 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 905 if (overflow_maj) 906 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 907 idr_destroy(&ib_uverbs_pd_idr); 908 idr_destroy(&ib_uverbs_mr_idr); 909 idr_destroy(&ib_uverbs_mw_idr); 910 idr_destroy(&ib_uverbs_ah_idr); 911 idr_destroy(&ib_uverbs_cq_idr); 912 idr_destroy(&ib_uverbs_qp_idr); 913 idr_destroy(&ib_uverbs_srq_idr); 914 } 915 916 module_init(ib_uverbs_init); 917 module_exit(ib_uverbs_cleanup); 918