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_ALLOC_MW] = ib_uverbs_alloc_mw, 91 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 92 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 93 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 94 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 95 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 96 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 97 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 98 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 99 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 100 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 101 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 102 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 103 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 104 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 105 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 106 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 107 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 108 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 109 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 110 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 111 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 112 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 113 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 114 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 115 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 116 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp 117 }; 118 119 static void ib_uverbs_add_one(struct ib_device *device); 120 static void ib_uverbs_remove_one(struct ib_device *device); 121 122 static void ib_uverbs_release_dev(struct kref *ref) 123 { 124 struct ib_uverbs_device *dev = 125 container_of(ref, struct ib_uverbs_device, ref); 126 127 complete(&dev->comp); 128 } 129 130 static void ib_uverbs_release_event_file(struct kref *ref) 131 { 132 struct ib_uverbs_event_file *file = 133 container_of(ref, struct ib_uverbs_event_file, ref); 134 135 kfree(file); 136 } 137 138 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 139 struct ib_uverbs_event_file *ev_file, 140 struct ib_ucq_object *uobj) 141 { 142 struct ib_uverbs_event *evt, *tmp; 143 144 if (ev_file) { 145 spin_lock_irq(&ev_file->lock); 146 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 147 list_del(&evt->list); 148 kfree(evt); 149 } 150 spin_unlock_irq(&ev_file->lock); 151 152 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 153 } 154 155 spin_lock_irq(&file->async_file->lock); 156 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 157 list_del(&evt->list); 158 kfree(evt); 159 } 160 spin_unlock_irq(&file->async_file->lock); 161 } 162 163 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 164 struct ib_uevent_object *uobj) 165 { 166 struct ib_uverbs_event *evt, *tmp; 167 168 spin_lock_irq(&file->async_file->lock); 169 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 170 list_del(&evt->list); 171 kfree(evt); 172 } 173 spin_unlock_irq(&file->async_file->lock); 174 } 175 176 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 177 struct ib_uqp_object *uobj) 178 { 179 struct ib_uverbs_mcast_entry *mcast, *tmp; 180 181 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 182 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 183 list_del(&mcast->list); 184 kfree(mcast); 185 } 186 } 187 188 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 189 struct ib_ucontext *context) 190 { 191 struct ib_uobject *uobj, *tmp; 192 193 if (!context) 194 return 0; 195 196 context->closing = 1; 197 198 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 199 struct ib_ah *ah = uobj->object; 200 201 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 202 ib_destroy_ah(ah); 203 kfree(uobj); 204 } 205 206 /* Remove MWs before QPs, in order to support type 2A MWs. */ 207 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { 208 struct ib_mw *mw = uobj->object; 209 210 idr_remove_uobj(&ib_uverbs_mw_idr, uobj); 211 ib_dealloc_mw(mw); 212 kfree(uobj); 213 } 214 215 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 216 struct ib_qp *qp = uobj->object; 217 struct ib_uqp_object *uqp = 218 container_of(uobj, struct ib_uqp_object, uevent.uobject); 219 220 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 221 if (qp != qp->real_qp) { 222 ib_close_qp(qp); 223 } else { 224 ib_uverbs_detach_umcast(qp, uqp); 225 ib_destroy_qp(qp); 226 } 227 ib_uverbs_release_uevent(file, &uqp->uevent); 228 kfree(uqp); 229 } 230 231 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 232 struct ib_cq *cq = uobj->object; 233 struct ib_uverbs_event_file *ev_file = cq->cq_context; 234 struct ib_ucq_object *ucq = 235 container_of(uobj, struct ib_ucq_object, uobject); 236 237 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 238 ib_destroy_cq(cq); 239 ib_uverbs_release_ucq(file, ev_file, ucq); 240 kfree(ucq); 241 } 242 243 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 244 struct ib_srq *srq = uobj->object; 245 struct ib_uevent_object *uevent = 246 container_of(uobj, struct ib_uevent_object, uobject); 247 248 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 249 ib_destroy_srq(srq); 250 ib_uverbs_release_uevent(file, uevent); 251 kfree(uevent); 252 } 253 254 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 255 struct ib_mr *mr = uobj->object; 256 257 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 258 ib_dereg_mr(mr); 259 kfree(uobj); 260 } 261 262 mutex_lock(&file->device->xrcd_tree_mutex); 263 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 264 struct ib_xrcd *xrcd = uobj->object; 265 struct ib_uxrcd_object *uxrcd = 266 container_of(uobj, struct ib_uxrcd_object, uobject); 267 268 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 269 ib_uverbs_dealloc_xrcd(file->device, xrcd); 270 kfree(uxrcd); 271 } 272 mutex_unlock(&file->device->xrcd_tree_mutex); 273 274 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 275 struct ib_pd *pd = uobj->object; 276 277 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 278 ib_dealloc_pd(pd); 279 kfree(uobj); 280 } 281 282 return context->device->dealloc_ucontext(context); 283 } 284 285 static void ib_uverbs_release_file(struct kref *ref) 286 { 287 struct ib_uverbs_file *file = 288 container_of(ref, struct ib_uverbs_file, ref); 289 290 module_put(file->device->ib_dev->owner); 291 kref_put(&file->device->ref, ib_uverbs_release_dev); 292 293 kfree(file); 294 } 295 296 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 297 size_t count, loff_t *pos) 298 { 299 struct ib_uverbs_event_file *file = filp->private_data; 300 struct ib_uverbs_event *event; 301 int eventsz; 302 int ret = 0; 303 304 spin_lock_irq(&file->lock); 305 306 while (list_empty(&file->event_list)) { 307 spin_unlock_irq(&file->lock); 308 309 if (filp->f_flags & O_NONBLOCK) 310 return -EAGAIN; 311 312 if (wait_event_interruptible(file->poll_wait, 313 !list_empty(&file->event_list))) 314 return -ERESTARTSYS; 315 316 spin_lock_irq(&file->lock); 317 } 318 319 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 320 321 if (file->is_async) 322 eventsz = sizeof (struct ib_uverbs_async_event_desc); 323 else 324 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 325 326 if (eventsz > count) { 327 ret = -EINVAL; 328 event = NULL; 329 } else { 330 list_del(file->event_list.next); 331 if (event->counter) { 332 ++(*event->counter); 333 list_del(&event->obj_list); 334 } 335 } 336 337 spin_unlock_irq(&file->lock); 338 339 if (event) { 340 if (copy_to_user(buf, event, eventsz)) 341 ret = -EFAULT; 342 else 343 ret = eventsz; 344 } 345 346 kfree(event); 347 348 return ret; 349 } 350 351 static unsigned int ib_uverbs_event_poll(struct file *filp, 352 struct poll_table_struct *wait) 353 { 354 unsigned int pollflags = 0; 355 struct ib_uverbs_event_file *file = filp->private_data; 356 357 poll_wait(filp, &file->poll_wait, wait); 358 359 spin_lock_irq(&file->lock); 360 if (!list_empty(&file->event_list)) 361 pollflags = POLLIN | POLLRDNORM; 362 spin_unlock_irq(&file->lock); 363 364 return pollflags; 365 } 366 367 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 368 { 369 struct ib_uverbs_event_file *file = filp->private_data; 370 371 return fasync_helper(fd, filp, on, &file->async_queue); 372 } 373 374 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 375 { 376 struct ib_uverbs_event_file *file = filp->private_data; 377 struct ib_uverbs_event *entry, *tmp; 378 379 spin_lock_irq(&file->lock); 380 file->is_closed = 1; 381 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 382 if (entry->counter) 383 list_del(&entry->obj_list); 384 kfree(entry); 385 } 386 spin_unlock_irq(&file->lock); 387 388 if (file->is_async) { 389 ib_unregister_event_handler(&file->uverbs_file->event_handler); 390 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 391 } 392 kref_put(&file->ref, ib_uverbs_release_event_file); 393 394 return 0; 395 } 396 397 static const struct file_operations uverbs_event_fops = { 398 .owner = THIS_MODULE, 399 .read = ib_uverbs_event_read, 400 .poll = ib_uverbs_event_poll, 401 .release = ib_uverbs_event_close, 402 .fasync = ib_uverbs_event_fasync, 403 .llseek = no_llseek, 404 }; 405 406 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 407 { 408 struct ib_uverbs_event_file *file = cq_context; 409 struct ib_ucq_object *uobj; 410 struct ib_uverbs_event *entry; 411 unsigned long flags; 412 413 if (!file) 414 return; 415 416 spin_lock_irqsave(&file->lock, flags); 417 if (file->is_closed) { 418 spin_unlock_irqrestore(&file->lock, flags); 419 return; 420 } 421 422 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 423 if (!entry) { 424 spin_unlock_irqrestore(&file->lock, flags); 425 return; 426 } 427 428 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 429 430 entry->desc.comp.cq_handle = cq->uobject->user_handle; 431 entry->counter = &uobj->comp_events_reported; 432 433 list_add_tail(&entry->list, &file->event_list); 434 list_add_tail(&entry->obj_list, &uobj->comp_list); 435 spin_unlock_irqrestore(&file->lock, flags); 436 437 wake_up_interruptible(&file->poll_wait); 438 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 439 } 440 441 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 442 __u64 element, __u64 event, 443 struct list_head *obj_list, 444 u32 *counter) 445 { 446 struct ib_uverbs_event *entry; 447 unsigned long flags; 448 449 spin_lock_irqsave(&file->async_file->lock, flags); 450 if (file->async_file->is_closed) { 451 spin_unlock_irqrestore(&file->async_file->lock, flags); 452 return; 453 } 454 455 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 456 if (!entry) { 457 spin_unlock_irqrestore(&file->async_file->lock, flags); 458 return; 459 } 460 461 entry->desc.async.element = element; 462 entry->desc.async.event_type = event; 463 entry->counter = counter; 464 465 list_add_tail(&entry->list, &file->async_file->event_list); 466 if (obj_list) 467 list_add_tail(&entry->obj_list, obj_list); 468 spin_unlock_irqrestore(&file->async_file->lock, flags); 469 470 wake_up_interruptible(&file->async_file->poll_wait); 471 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 472 } 473 474 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 475 { 476 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 477 struct ib_ucq_object, uobject); 478 479 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 480 event->event, &uobj->async_list, 481 &uobj->async_events_reported); 482 } 483 484 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 485 { 486 struct ib_uevent_object *uobj; 487 488 uobj = container_of(event->element.qp->uobject, 489 struct ib_uevent_object, uobject); 490 491 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 492 event->event, &uobj->event_list, 493 &uobj->events_reported); 494 } 495 496 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 497 { 498 struct ib_uevent_object *uobj; 499 500 uobj = container_of(event->element.srq->uobject, 501 struct ib_uevent_object, uobject); 502 503 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 504 event->event, &uobj->event_list, 505 &uobj->events_reported); 506 } 507 508 void ib_uverbs_event_handler(struct ib_event_handler *handler, 509 struct ib_event *event) 510 { 511 struct ib_uverbs_file *file = 512 container_of(handler, struct ib_uverbs_file, event_handler); 513 514 ib_uverbs_async_handler(file, event->element.port_num, event->event, 515 NULL, NULL); 516 } 517 518 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 519 int is_async) 520 { 521 struct ib_uverbs_event_file *ev_file; 522 struct file *filp; 523 524 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 525 if (!ev_file) 526 return ERR_PTR(-ENOMEM); 527 528 kref_init(&ev_file->ref); 529 spin_lock_init(&ev_file->lock); 530 INIT_LIST_HEAD(&ev_file->event_list); 531 init_waitqueue_head(&ev_file->poll_wait); 532 ev_file->uverbs_file = uverbs_file; 533 ev_file->async_queue = NULL; 534 ev_file->is_async = is_async; 535 ev_file->is_closed = 0; 536 537 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 538 ev_file, O_RDONLY); 539 if (IS_ERR(filp)) 540 kfree(ev_file); 541 542 return filp; 543 } 544 545 /* 546 * Look up a completion event file by FD. If lookup is successful, 547 * takes a ref to the event file struct that it returns; if 548 * unsuccessful, returns NULL. 549 */ 550 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 551 { 552 struct ib_uverbs_event_file *ev_file = NULL; 553 struct fd f = fdget(fd); 554 555 if (!f.file) 556 return NULL; 557 558 if (f.file->f_op != &uverbs_event_fops) 559 goto out; 560 561 ev_file = f.file->private_data; 562 if (ev_file->is_async) { 563 ev_file = NULL; 564 goto out; 565 } 566 567 kref_get(&ev_file->ref); 568 569 out: 570 fdput(f); 571 return ev_file; 572 } 573 574 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 575 size_t count, loff_t *pos) 576 { 577 struct ib_uverbs_file *file = filp->private_data; 578 struct ib_uverbs_cmd_hdr hdr; 579 580 if (count < sizeof hdr) 581 return -EINVAL; 582 583 if (copy_from_user(&hdr, buf, sizeof hdr)) 584 return -EFAULT; 585 586 if (hdr.in_words * 4 != count) 587 return -EINVAL; 588 589 if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 590 !uverbs_cmd_table[hdr.command]) 591 return -EINVAL; 592 593 if (!file->ucontext && 594 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 595 return -EINVAL; 596 597 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 598 return -ENOSYS; 599 600 return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, 601 hdr.in_words * 4, hdr.out_words * 4); 602 } 603 604 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 605 { 606 struct ib_uverbs_file *file = filp->private_data; 607 608 if (!file->ucontext) 609 return -ENODEV; 610 else 611 return file->device->ib_dev->mmap(file->ucontext, vma); 612 } 613 614 /* 615 * ib_uverbs_open() does not need the BKL: 616 * 617 * - the ib_uverbs_device structures are properly reference counted and 618 * everything else is purely local to the file being created, so 619 * races against other open calls are not a problem; 620 * - there is no ioctl method to race against; 621 * - the open method will either immediately run -ENXIO, or all 622 * required initialization will be done. 623 */ 624 static int ib_uverbs_open(struct inode *inode, struct file *filp) 625 { 626 struct ib_uverbs_device *dev; 627 struct ib_uverbs_file *file; 628 int ret; 629 630 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 631 if (dev) 632 kref_get(&dev->ref); 633 else 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 nonseekable_open(inode, filp); 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 .llseek = no_llseek, 685 }; 686 687 static const struct file_operations uverbs_mmap_fops = { 688 .owner = THIS_MODULE, 689 .write = ib_uverbs_write, 690 .mmap = ib_uverbs_mmap, 691 .open = ib_uverbs_open, 692 .release = ib_uverbs_close, 693 .llseek = no_llseek, 694 }; 695 696 static struct ib_client uverbs_client = { 697 .name = "uverbs", 698 .add = ib_uverbs_add_one, 699 .remove = ib_uverbs_remove_one 700 }; 701 702 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 703 char *buf) 704 { 705 struct ib_uverbs_device *dev = dev_get_drvdata(device); 706 707 if (!dev) 708 return -ENODEV; 709 710 return sprintf(buf, "%s\n", dev->ib_dev->name); 711 } 712 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 713 714 static ssize_t show_dev_abi_version(struct device *device, 715 struct device_attribute *attr, char *buf) 716 { 717 struct ib_uverbs_device *dev = dev_get_drvdata(device); 718 719 if (!dev) 720 return -ENODEV; 721 722 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 723 } 724 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 725 726 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 727 __stringify(IB_USER_VERBS_ABI_VERSION)); 728 729 static dev_t overflow_maj; 730 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 731 732 /* 733 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 734 * requesting a new major number and doubling the number of max devices we 735 * support. It's stupid, but simple. 736 */ 737 static int find_overflow_devnum(void) 738 { 739 int ret; 740 741 if (!overflow_maj) { 742 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 743 "infiniband_verbs"); 744 if (ret) { 745 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 746 return ret; 747 } 748 } 749 750 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 751 if (ret >= IB_UVERBS_MAX_DEVICES) 752 return -1; 753 754 return ret; 755 } 756 757 static void ib_uverbs_add_one(struct ib_device *device) 758 { 759 int devnum; 760 dev_t base; 761 struct ib_uverbs_device *uverbs_dev; 762 763 if (!device->alloc_ucontext) 764 return; 765 766 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 767 if (!uverbs_dev) 768 return; 769 770 kref_init(&uverbs_dev->ref); 771 init_completion(&uverbs_dev->comp); 772 uverbs_dev->xrcd_tree = RB_ROOT; 773 mutex_init(&uverbs_dev->xrcd_tree_mutex); 774 775 spin_lock(&map_lock); 776 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 777 if (devnum >= IB_UVERBS_MAX_DEVICES) { 778 spin_unlock(&map_lock); 779 devnum = find_overflow_devnum(); 780 if (devnum < 0) 781 goto err; 782 783 spin_lock(&map_lock); 784 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 785 base = devnum + overflow_maj; 786 set_bit(devnum, overflow_map); 787 } else { 788 uverbs_dev->devnum = devnum; 789 base = devnum + IB_UVERBS_BASE_DEV; 790 set_bit(devnum, dev_map); 791 } 792 spin_unlock(&map_lock); 793 794 uverbs_dev->ib_dev = device; 795 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 796 797 cdev_init(&uverbs_dev->cdev, NULL); 798 uverbs_dev->cdev.owner = THIS_MODULE; 799 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 800 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 801 if (cdev_add(&uverbs_dev->cdev, base, 1)) 802 goto err_cdev; 803 804 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 805 uverbs_dev->cdev.dev, uverbs_dev, 806 "uverbs%d", uverbs_dev->devnum); 807 if (IS_ERR(uverbs_dev->dev)) 808 goto err_cdev; 809 810 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 811 goto err_class; 812 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 813 goto err_class; 814 815 ib_set_client_data(device, &uverbs_client, uverbs_dev); 816 817 return; 818 819 err_class: 820 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 821 822 err_cdev: 823 cdev_del(&uverbs_dev->cdev); 824 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 825 clear_bit(devnum, dev_map); 826 else 827 clear_bit(devnum, overflow_map); 828 829 err: 830 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 831 wait_for_completion(&uverbs_dev->comp); 832 kfree(uverbs_dev); 833 return; 834 } 835 836 static void ib_uverbs_remove_one(struct ib_device *device) 837 { 838 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 839 840 if (!uverbs_dev) 841 return; 842 843 dev_set_drvdata(uverbs_dev->dev, NULL); 844 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 845 cdev_del(&uverbs_dev->cdev); 846 847 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 848 clear_bit(uverbs_dev->devnum, dev_map); 849 else 850 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 851 852 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 853 wait_for_completion(&uverbs_dev->comp); 854 kfree(uverbs_dev); 855 } 856 857 static char *uverbs_devnode(struct device *dev, umode_t *mode) 858 { 859 if (mode) 860 *mode = 0666; 861 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 862 } 863 864 static int __init ib_uverbs_init(void) 865 { 866 int ret; 867 868 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 869 "infiniband_verbs"); 870 if (ret) { 871 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 872 goto out; 873 } 874 875 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 876 if (IS_ERR(uverbs_class)) { 877 ret = PTR_ERR(uverbs_class); 878 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 879 goto out_chrdev; 880 } 881 882 uverbs_class->devnode = uverbs_devnode; 883 884 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 885 if (ret) { 886 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 887 goto out_class; 888 } 889 890 ret = ib_register_client(&uverbs_client); 891 if (ret) { 892 printk(KERN_ERR "user_verbs: couldn't register client\n"); 893 goto out_class; 894 } 895 896 return 0; 897 898 out_class: 899 class_destroy(uverbs_class); 900 901 out_chrdev: 902 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 903 904 out: 905 return ret; 906 } 907 908 static void __exit ib_uverbs_cleanup(void) 909 { 910 ib_unregister_client(&uverbs_client); 911 class_destroy(uverbs_class); 912 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 913 if (overflow_maj) 914 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 915 idr_destroy(&ib_uverbs_pd_idr); 916 idr_destroy(&ib_uverbs_mr_idr); 917 idr_destroy(&ib_uverbs_mw_idr); 918 idr_destroy(&ib_uverbs_ah_idr); 919 idr_destroy(&ib_uverbs_cq_idr); 920 idr_destroy(&ib_uverbs_qp_idr); 921 idr_destroy(&ib_uverbs_srq_idr); 922 } 923 924 module_init(ib_uverbs_init); 925 module_exit(ib_uverbs_cleanup); 926