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 DEFINE_IDR(ib_uverbs_rule_idr); 77 78 static DEFINE_SPINLOCK(map_lock); 79 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 80 81 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 82 const char __user *buf, int in_len, 83 int out_len) = { 84 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 85 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 86 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 87 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 88 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 89 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 90 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 91 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 92 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 93 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 94 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 95 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 96 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 97 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 98 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 99 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 100 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 101 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 102 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 103 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 104 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 105 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 106 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 107 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 108 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 109 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 110 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 111 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 112 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 113 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 114 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 115 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 116 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 117 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 118 [IB_USER_VERBS_CMD_CREATE_FLOW] = ib_uverbs_create_flow, 119 [IB_USER_VERBS_CMD_DESTROY_FLOW] = ib_uverbs_destroy_flow 120 }; 121 122 static void ib_uverbs_add_one(struct ib_device *device); 123 static void ib_uverbs_remove_one(struct ib_device *device); 124 125 static void ib_uverbs_release_dev(struct kref *ref) 126 { 127 struct ib_uverbs_device *dev = 128 container_of(ref, struct ib_uverbs_device, ref); 129 130 complete(&dev->comp); 131 } 132 133 static void ib_uverbs_release_event_file(struct kref *ref) 134 { 135 struct ib_uverbs_event_file *file = 136 container_of(ref, struct ib_uverbs_event_file, ref); 137 138 kfree(file); 139 } 140 141 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 142 struct ib_uverbs_event_file *ev_file, 143 struct ib_ucq_object *uobj) 144 { 145 struct ib_uverbs_event *evt, *tmp; 146 147 if (ev_file) { 148 spin_lock_irq(&ev_file->lock); 149 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 150 list_del(&evt->list); 151 kfree(evt); 152 } 153 spin_unlock_irq(&ev_file->lock); 154 155 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 156 } 157 158 spin_lock_irq(&file->async_file->lock); 159 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 160 list_del(&evt->list); 161 kfree(evt); 162 } 163 spin_unlock_irq(&file->async_file->lock); 164 } 165 166 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 167 struct ib_uevent_object *uobj) 168 { 169 struct ib_uverbs_event *evt, *tmp; 170 171 spin_lock_irq(&file->async_file->lock); 172 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 173 list_del(&evt->list); 174 kfree(evt); 175 } 176 spin_unlock_irq(&file->async_file->lock); 177 } 178 179 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 180 struct ib_uqp_object *uobj) 181 { 182 struct ib_uverbs_mcast_entry *mcast, *tmp; 183 184 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 185 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 186 list_del(&mcast->list); 187 kfree(mcast); 188 } 189 } 190 191 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 192 struct ib_ucontext *context) 193 { 194 struct ib_uobject *uobj, *tmp; 195 196 if (!context) 197 return 0; 198 199 context->closing = 1; 200 201 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 202 struct ib_ah *ah = uobj->object; 203 204 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 205 ib_destroy_ah(ah); 206 kfree(uobj); 207 } 208 209 /* Remove MWs before QPs, in order to support type 2A MWs. */ 210 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { 211 struct ib_mw *mw = uobj->object; 212 213 idr_remove_uobj(&ib_uverbs_mw_idr, uobj); 214 ib_dealloc_mw(mw); 215 kfree(uobj); 216 } 217 218 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { 219 struct ib_flow *flow_id = uobj->object; 220 221 idr_remove_uobj(&ib_uverbs_rule_idr, uobj); 222 ib_destroy_flow(flow_id); 223 kfree(uobj); 224 } 225 226 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 227 struct ib_qp *qp = uobj->object; 228 struct ib_uqp_object *uqp = 229 container_of(uobj, struct ib_uqp_object, uevent.uobject); 230 231 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 232 if (qp != qp->real_qp) { 233 ib_close_qp(qp); 234 } else { 235 ib_uverbs_detach_umcast(qp, uqp); 236 ib_destroy_qp(qp); 237 } 238 ib_uverbs_release_uevent(file, &uqp->uevent); 239 kfree(uqp); 240 } 241 242 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 243 struct ib_cq *cq = uobj->object; 244 struct ib_uverbs_event_file *ev_file = cq->cq_context; 245 struct ib_ucq_object *ucq = 246 container_of(uobj, struct ib_ucq_object, uobject); 247 248 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 249 ib_destroy_cq(cq); 250 ib_uverbs_release_ucq(file, ev_file, ucq); 251 kfree(ucq); 252 } 253 254 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 255 struct ib_srq *srq = uobj->object; 256 struct ib_uevent_object *uevent = 257 container_of(uobj, struct ib_uevent_object, uobject); 258 259 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 260 ib_destroy_srq(srq); 261 ib_uverbs_release_uevent(file, uevent); 262 kfree(uevent); 263 } 264 265 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 266 struct ib_mr *mr = uobj->object; 267 268 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 269 ib_dereg_mr(mr); 270 kfree(uobj); 271 } 272 273 mutex_lock(&file->device->xrcd_tree_mutex); 274 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 275 struct ib_xrcd *xrcd = uobj->object; 276 struct ib_uxrcd_object *uxrcd = 277 container_of(uobj, struct ib_uxrcd_object, uobject); 278 279 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 280 ib_uverbs_dealloc_xrcd(file->device, xrcd); 281 kfree(uxrcd); 282 } 283 mutex_unlock(&file->device->xrcd_tree_mutex); 284 285 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 286 struct ib_pd *pd = uobj->object; 287 288 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 289 ib_dealloc_pd(pd); 290 kfree(uobj); 291 } 292 293 return context->device->dealloc_ucontext(context); 294 } 295 296 static void ib_uverbs_release_file(struct kref *ref) 297 { 298 struct ib_uverbs_file *file = 299 container_of(ref, struct ib_uverbs_file, ref); 300 301 module_put(file->device->ib_dev->owner); 302 kref_put(&file->device->ref, ib_uverbs_release_dev); 303 304 kfree(file); 305 } 306 307 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 308 size_t count, loff_t *pos) 309 { 310 struct ib_uverbs_event_file *file = filp->private_data; 311 struct ib_uverbs_event *event; 312 int eventsz; 313 int ret = 0; 314 315 spin_lock_irq(&file->lock); 316 317 while (list_empty(&file->event_list)) { 318 spin_unlock_irq(&file->lock); 319 320 if (filp->f_flags & O_NONBLOCK) 321 return -EAGAIN; 322 323 if (wait_event_interruptible(file->poll_wait, 324 !list_empty(&file->event_list))) 325 return -ERESTARTSYS; 326 327 spin_lock_irq(&file->lock); 328 } 329 330 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 331 332 if (file->is_async) 333 eventsz = sizeof (struct ib_uverbs_async_event_desc); 334 else 335 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 336 337 if (eventsz > count) { 338 ret = -EINVAL; 339 event = NULL; 340 } else { 341 list_del(file->event_list.next); 342 if (event->counter) { 343 ++(*event->counter); 344 list_del(&event->obj_list); 345 } 346 } 347 348 spin_unlock_irq(&file->lock); 349 350 if (event) { 351 if (copy_to_user(buf, event, eventsz)) 352 ret = -EFAULT; 353 else 354 ret = eventsz; 355 } 356 357 kfree(event); 358 359 return ret; 360 } 361 362 static unsigned int ib_uverbs_event_poll(struct file *filp, 363 struct poll_table_struct *wait) 364 { 365 unsigned int pollflags = 0; 366 struct ib_uverbs_event_file *file = filp->private_data; 367 368 poll_wait(filp, &file->poll_wait, wait); 369 370 spin_lock_irq(&file->lock); 371 if (!list_empty(&file->event_list)) 372 pollflags = POLLIN | POLLRDNORM; 373 spin_unlock_irq(&file->lock); 374 375 return pollflags; 376 } 377 378 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 379 { 380 struct ib_uverbs_event_file *file = filp->private_data; 381 382 return fasync_helper(fd, filp, on, &file->async_queue); 383 } 384 385 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 386 { 387 struct ib_uverbs_event_file *file = filp->private_data; 388 struct ib_uverbs_event *entry, *tmp; 389 390 spin_lock_irq(&file->lock); 391 file->is_closed = 1; 392 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 393 if (entry->counter) 394 list_del(&entry->obj_list); 395 kfree(entry); 396 } 397 spin_unlock_irq(&file->lock); 398 399 if (file->is_async) { 400 ib_unregister_event_handler(&file->uverbs_file->event_handler); 401 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 402 } 403 kref_put(&file->ref, ib_uverbs_release_event_file); 404 405 return 0; 406 } 407 408 static const struct file_operations uverbs_event_fops = { 409 .owner = THIS_MODULE, 410 .read = ib_uverbs_event_read, 411 .poll = ib_uverbs_event_poll, 412 .release = ib_uverbs_event_close, 413 .fasync = ib_uverbs_event_fasync, 414 .llseek = no_llseek, 415 }; 416 417 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 418 { 419 struct ib_uverbs_event_file *file = cq_context; 420 struct ib_ucq_object *uobj; 421 struct ib_uverbs_event *entry; 422 unsigned long flags; 423 424 if (!file) 425 return; 426 427 spin_lock_irqsave(&file->lock, flags); 428 if (file->is_closed) { 429 spin_unlock_irqrestore(&file->lock, flags); 430 return; 431 } 432 433 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 434 if (!entry) { 435 spin_unlock_irqrestore(&file->lock, flags); 436 return; 437 } 438 439 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 440 441 entry->desc.comp.cq_handle = cq->uobject->user_handle; 442 entry->counter = &uobj->comp_events_reported; 443 444 list_add_tail(&entry->list, &file->event_list); 445 list_add_tail(&entry->obj_list, &uobj->comp_list); 446 spin_unlock_irqrestore(&file->lock, flags); 447 448 wake_up_interruptible(&file->poll_wait); 449 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 450 } 451 452 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 453 __u64 element, __u64 event, 454 struct list_head *obj_list, 455 u32 *counter) 456 { 457 struct ib_uverbs_event *entry; 458 unsigned long flags; 459 460 spin_lock_irqsave(&file->async_file->lock, flags); 461 if (file->async_file->is_closed) { 462 spin_unlock_irqrestore(&file->async_file->lock, flags); 463 return; 464 } 465 466 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 467 if (!entry) { 468 spin_unlock_irqrestore(&file->async_file->lock, flags); 469 return; 470 } 471 472 entry->desc.async.element = element; 473 entry->desc.async.event_type = event; 474 entry->counter = counter; 475 476 list_add_tail(&entry->list, &file->async_file->event_list); 477 if (obj_list) 478 list_add_tail(&entry->obj_list, obj_list); 479 spin_unlock_irqrestore(&file->async_file->lock, flags); 480 481 wake_up_interruptible(&file->async_file->poll_wait); 482 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 483 } 484 485 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 486 { 487 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 488 struct ib_ucq_object, uobject); 489 490 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 491 event->event, &uobj->async_list, 492 &uobj->async_events_reported); 493 } 494 495 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 496 { 497 struct ib_uevent_object *uobj; 498 499 uobj = container_of(event->element.qp->uobject, 500 struct ib_uevent_object, uobject); 501 502 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 503 event->event, &uobj->event_list, 504 &uobj->events_reported); 505 } 506 507 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 508 { 509 struct ib_uevent_object *uobj; 510 511 uobj = container_of(event->element.srq->uobject, 512 struct ib_uevent_object, uobject); 513 514 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 515 event->event, &uobj->event_list, 516 &uobj->events_reported); 517 } 518 519 void ib_uverbs_event_handler(struct ib_event_handler *handler, 520 struct ib_event *event) 521 { 522 struct ib_uverbs_file *file = 523 container_of(handler, struct ib_uverbs_file, event_handler); 524 525 ib_uverbs_async_handler(file, event->element.port_num, event->event, 526 NULL, NULL); 527 } 528 529 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 530 int is_async) 531 { 532 struct ib_uverbs_event_file *ev_file; 533 struct file *filp; 534 535 ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); 536 if (!ev_file) 537 return ERR_PTR(-ENOMEM); 538 539 kref_init(&ev_file->ref); 540 spin_lock_init(&ev_file->lock); 541 INIT_LIST_HEAD(&ev_file->event_list); 542 init_waitqueue_head(&ev_file->poll_wait); 543 ev_file->uverbs_file = uverbs_file; 544 ev_file->async_queue = NULL; 545 ev_file->is_async = is_async; 546 ev_file->is_closed = 0; 547 548 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 549 ev_file, O_RDONLY); 550 if (IS_ERR(filp)) 551 kfree(ev_file); 552 553 return filp; 554 } 555 556 /* 557 * Look up a completion event file by FD. If lookup is successful, 558 * takes a ref to the event file struct that it returns; if 559 * unsuccessful, returns NULL. 560 */ 561 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 562 { 563 struct ib_uverbs_event_file *ev_file = NULL; 564 struct fd f = fdget(fd); 565 566 if (!f.file) 567 return NULL; 568 569 if (f.file->f_op != &uverbs_event_fops) 570 goto out; 571 572 ev_file = f.file->private_data; 573 if (ev_file->is_async) { 574 ev_file = NULL; 575 goto out; 576 } 577 578 kref_get(&ev_file->ref); 579 580 out: 581 fdput(f); 582 return ev_file; 583 } 584 585 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 586 size_t count, loff_t *pos) 587 { 588 struct ib_uverbs_file *file = filp->private_data; 589 struct ib_uverbs_cmd_hdr hdr; 590 591 if (count < sizeof hdr) 592 return -EINVAL; 593 594 if (copy_from_user(&hdr, buf, sizeof hdr)) 595 return -EFAULT; 596 597 if (hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || 598 !uverbs_cmd_table[hdr.command]) 599 return -EINVAL; 600 601 if (!file->ucontext && 602 hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) 603 return -EINVAL; 604 605 if (!(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) 606 return -ENOSYS; 607 608 if (hdr.command >= IB_USER_VERBS_CMD_THRESHOLD) { 609 struct ib_uverbs_cmd_hdr_ex hdr_ex; 610 611 if (copy_from_user(&hdr_ex, buf, sizeof(hdr_ex))) 612 return -EFAULT; 613 614 if (((hdr_ex.in_words + hdr_ex.provider_in_words) * 4) != count) 615 return -EINVAL; 616 617 return uverbs_cmd_table[hdr.command](file, 618 buf + sizeof(hdr_ex), 619 (hdr_ex.in_words + 620 hdr_ex.provider_in_words) * 4, 621 (hdr_ex.out_words + 622 hdr_ex.provider_out_words) * 4); 623 } else { 624 if (hdr.in_words * 4 != count) 625 return -EINVAL; 626 627 return uverbs_cmd_table[hdr.command](file, 628 buf + sizeof(hdr), 629 hdr.in_words * 4, 630 hdr.out_words * 4); 631 } 632 } 633 634 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 635 { 636 struct ib_uverbs_file *file = filp->private_data; 637 638 if (!file->ucontext) 639 return -ENODEV; 640 else 641 return file->device->ib_dev->mmap(file->ucontext, vma); 642 } 643 644 /* 645 * ib_uverbs_open() does not need the BKL: 646 * 647 * - the ib_uverbs_device structures are properly reference counted and 648 * everything else is purely local to the file being created, so 649 * races against other open calls are not a problem; 650 * - there is no ioctl method to race against; 651 * - the open method will either immediately run -ENXIO, or all 652 * required initialization will be done. 653 */ 654 static int ib_uverbs_open(struct inode *inode, struct file *filp) 655 { 656 struct ib_uverbs_device *dev; 657 struct ib_uverbs_file *file; 658 int ret; 659 660 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 661 if (dev) 662 kref_get(&dev->ref); 663 else 664 return -ENXIO; 665 666 if (!try_module_get(dev->ib_dev->owner)) { 667 ret = -ENODEV; 668 goto err; 669 } 670 671 file = kmalloc(sizeof *file, GFP_KERNEL); 672 if (!file) { 673 ret = -ENOMEM; 674 goto err_module; 675 } 676 677 file->device = dev; 678 file->ucontext = NULL; 679 file->async_file = NULL; 680 kref_init(&file->ref); 681 mutex_init(&file->mutex); 682 683 filp->private_data = file; 684 685 return nonseekable_open(inode, filp); 686 687 err_module: 688 module_put(dev->ib_dev->owner); 689 690 err: 691 kref_put(&dev->ref, ib_uverbs_release_dev); 692 return ret; 693 } 694 695 static int ib_uverbs_close(struct inode *inode, struct file *filp) 696 { 697 struct ib_uverbs_file *file = filp->private_data; 698 699 ib_uverbs_cleanup_ucontext(file, file->ucontext); 700 701 if (file->async_file) 702 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 703 704 kref_put(&file->ref, ib_uverbs_release_file); 705 706 return 0; 707 } 708 709 static const struct file_operations uverbs_fops = { 710 .owner = THIS_MODULE, 711 .write = ib_uverbs_write, 712 .open = ib_uverbs_open, 713 .release = ib_uverbs_close, 714 .llseek = no_llseek, 715 }; 716 717 static const struct file_operations uverbs_mmap_fops = { 718 .owner = THIS_MODULE, 719 .write = ib_uverbs_write, 720 .mmap = ib_uverbs_mmap, 721 .open = ib_uverbs_open, 722 .release = ib_uverbs_close, 723 .llseek = no_llseek, 724 }; 725 726 static struct ib_client uverbs_client = { 727 .name = "uverbs", 728 .add = ib_uverbs_add_one, 729 .remove = ib_uverbs_remove_one 730 }; 731 732 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 733 char *buf) 734 { 735 struct ib_uverbs_device *dev = dev_get_drvdata(device); 736 737 if (!dev) 738 return -ENODEV; 739 740 return sprintf(buf, "%s\n", dev->ib_dev->name); 741 } 742 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 743 744 static ssize_t show_dev_abi_version(struct device *device, 745 struct device_attribute *attr, char *buf) 746 { 747 struct ib_uverbs_device *dev = dev_get_drvdata(device); 748 749 if (!dev) 750 return -ENODEV; 751 752 return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); 753 } 754 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 755 756 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 757 __stringify(IB_USER_VERBS_ABI_VERSION)); 758 759 static dev_t overflow_maj; 760 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 761 762 /* 763 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 764 * requesting a new major number and doubling the number of max devices we 765 * support. It's stupid, but simple. 766 */ 767 static int find_overflow_devnum(void) 768 { 769 int ret; 770 771 if (!overflow_maj) { 772 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 773 "infiniband_verbs"); 774 if (ret) { 775 printk(KERN_ERR "user_verbs: couldn't register dynamic device number\n"); 776 return ret; 777 } 778 } 779 780 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 781 if (ret >= IB_UVERBS_MAX_DEVICES) 782 return -1; 783 784 return ret; 785 } 786 787 static void ib_uverbs_add_one(struct ib_device *device) 788 { 789 int devnum; 790 dev_t base; 791 struct ib_uverbs_device *uverbs_dev; 792 793 if (!device->alloc_ucontext) 794 return; 795 796 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 797 if (!uverbs_dev) 798 return; 799 800 kref_init(&uverbs_dev->ref); 801 init_completion(&uverbs_dev->comp); 802 uverbs_dev->xrcd_tree = RB_ROOT; 803 mutex_init(&uverbs_dev->xrcd_tree_mutex); 804 805 spin_lock(&map_lock); 806 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 807 if (devnum >= IB_UVERBS_MAX_DEVICES) { 808 spin_unlock(&map_lock); 809 devnum = find_overflow_devnum(); 810 if (devnum < 0) 811 goto err; 812 813 spin_lock(&map_lock); 814 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 815 base = devnum + overflow_maj; 816 set_bit(devnum, overflow_map); 817 } else { 818 uverbs_dev->devnum = devnum; 819 base = devnum + IB_UVERBS_BASE_DEV; 820 set_bit(devnum, dev_map); 821 } 822 spin_unlock(&map_lock); 823 824 uverbs_dev->ib_dev = device; 825 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 826 827 cdev_init(&uverbs_dev->cdev, NULL); 828 uverbs_dev->cdev.owner = THIS_MODULE; 829 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 830 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 831 if (cdev_add(&uverbs_dev->cdev, base, 1)) 832 goto err_cdev; 833 834 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 835 uverbs_dev->cdev.dev, uverbs_dev, 836 "uverbs%d", uverbs_dev->devnum); 837 if (IS_ERR(uverbs_dev->dev)) 838 goto err_cdev; 839 840 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 841 goto err_class; 842 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 843 goto err_class; 844 845 ib_set_client_data(device, &uverbs_client, uverbs_dev); 846 847 return; 848 849 err_class: 850 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 851 852 err_cdev: 853 cdev_del(&uverbs_dev->cdev); 854 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 855 clear_bit(devnum, dev_map); 856 else 857 clear_bit(devnum, overflow_map); 858 859 err: 860 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 861 wait_for_completion(&uverbs_dev->comp); 862 kfree(uverbs_dev); 863 return; 864 } 865 866 static void ib_uverbs_remove_one(struct ib_device *device) 867 { 868 struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); 869 870 if (!uverbs_dev) 871 return; 872 873 dev_set_drvdata(uverbs_dev->dev, NULL); 874 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 875 cdev_del(&uverbs_dev->cdev); 876 877 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 878 clear_bit(uverbs_dev->devnum, dev_map); 879 else 880 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 881 882 kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); 883 wait_for_completion(&uverbs_dev->comp); 884 kfree(uverbs_dev); 885 } 886 887 static char *uverbs_devnode(struct device *dev, umode_t *mode) 888 { 889 if (mode) 890 *mode = 0666; 891 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 892 } 893 894 static int __init ib_uverbs_init(void) 895 { 896 int ret; 897 898 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 899 "infiniband_verbs"); 900 if (ret) { 901 printk(KERN_ERR "user_verbs: couldn't register device number\n"); 902 goto out; 903 } 904 905 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 906 if (IS_ERR(uverbs_class)) { 907 ret = PTR_ERR(uverbs_class); 908 printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); 909 goto out_chrdev; 910 } 911 912 uverbs_class->devnode = uverbs_devnode; 913 914 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 915 if (ret) { 916 printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); 917 goto out_class; 918 } 919 920 ret = ib_register_client(&uverbs_client); 921 if (ret) { 922 printk(KERN_ERR "user_verbs: couldn't register client\n"); 923 goto out_class; 924 } 925 926 return 0; 927 928 out_class: 929 class_destroy(uverbs_class); 930 931 out_chrdev: 932 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 933 934 out: 935 return ret; 936 } 937 938 static void __exit ib_uverbs_cleanup(void) 939 { 940 ib_unregister_client(&uverbs_client); 941 class_destroy(uverbs_class); 942 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 943 if (overflow_maj) 944 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 945 idr_destroy(&ib_uverbs_pd_idr); 946 idr_destroy(&ib_uverbs_mr_idr); 947 idr_destroy(&ib_uverbs_mw_idr); 948 idr_destroy(&ib_uverbs_ah_idr); 949 idr_destroy(&ib_uverbs_cq_idr); 950 idr_destroy(&ib_uverbs_qp_idr); 951 idr_destroy(&ib_uverbs_srq_idr); 952 } 953 954 module_init(ib_uverbs_init); 955 module_exit(ib_uverbs_cleanup); 956