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 <rdma/ib.h> 52 53 #include "uverbs.h" 54 55 MODULE_AUTHOR("Roland Dreier"); 56 MODULE_DESCRIPTION("InfiniBand userspace verbs access"); 57 MODULE_LICENSE("Dual BSD/GPL"); 58 59 enum { 60 IB_UVERBS_MAJOR = 231, 61 IB_UVERBS_BASE_MINOR = 192, 62 IB_UVERBS_MAX_DEVICES = 32 63 }; 64 65 #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) 66 67 static struct class *uverbs_class; 68 69 DEFINE_SPINLOCK(ib_uverbs_idr_lock); 70 DEFINE_IDR(ib_uverbs_pd_idr); 71 DEFINE_IDR(ib_uverbs_mr_idr); 72 DEFINE_IDR(ib_uverbs_mw_idr); 73 DEFINE_IDR(ib_uverbs_ah_idr); 74 DEFINE_IDR(ib_uverbs_cq_idr); 75 DEFINE_IDR(ib_uverbs_qp_idr); 76 DEFINE_IDR(ib_uverbs_srq_idr); 77 DEFINE_IDR(ib_uverbs_xrcd_idr); 78 DEFINE_IDR(ib_uverbs_rule_idr); 79 DEFINE_IDR(ib_uverbs_wq_idr); 80 DEFINE_IDR(ib_uverbs_rwq_ind_tbl_idr); 81 82 static DEFINE_SPINLOCK(map_lock); 83 static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); 84 85 static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, 86 struct ib_device *ib_dev, 87 const char __user *buf, int in_len, 88 int out_len) = { 89 [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, 90 [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, 91 [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, 92 [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, 93 [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, 94 [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, 95 [IB_USER_VERBS_CMD_REREG_MR] = ib_uverbs_rereg_mr, 96 [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, 97 [IB_USER_VERBS_CMD_ALLOC_MW] = ib_uverbs_alloc_mw, 98 [IB_USER_VERBS_CMD_DEALLOC_MW] = ib_uverbs_dealloc_mw, 99 [IB_USER_VERBS_CMD_CREATE_COMP_CHANNEL] = ib_uverbs_create_comp_channel, 100 [IB_USER_VERBS_CMD_CREATE_CQ] = ib_uverbs_create_cq, 101 [IB_USER_VERBS_CMD_RESIZE_CQ] = ib_uverbs_resize_cq, 102 [IB_USER_VERBS_CMD_POLL_CQ] = ib_uverbs_poll_cq, 103 [IB_USER_VERBS_CMD_REQ_NOTIFY_CQ] = ib_uverbs_req_notify_cq, 104 [IB_USER_VERBS_CMD_DESTROY_CQ] = ib_uverbs_destroy_cq, 105 [IB_USER_VERBS_CMD_CREATE_QP] = ib_uverbs_create_qp, 106 [IB_USER_VERBS_CMD_QUERY_QP] = ib_uverbs_query_qp, 107 [IB_USER_VERBS_CMD_MODIFY_QP] = ib_uverbs_modify_qp, 108 [IB_USER_VERBS_CMD_DESTROY_QP] = ib_uverbs_destroy_qp, 109 [IB_USER_VERBS_CMD_POST_SEND] = ib_uverbs_post_send, 110 [IB_USER_VERBS_CMD_POST_RECV] = ib_uverbs_post_recv, 111 [IB_USER_VERBS_CMD_POST_SRQ_RECV] = ib_uverbs_post_srq_recv, 112 [IB_USER_VERBS_CMD_CREATE_AH] = ib_uverbs_create_ah, 113 [IB_USER_VERBS_CMD_DESTROY_AH] = ib_uverbs_destroy_ah, 114 [IB_USER_VERBS_CMD_ATTACH_MCAST] = ib_uverbs_attach_mcast, 115 [IB_USER_VERBS_CMD_DETACH_MCAST] = ib_uverbs_detach_mcast, 116 [IB_USER_VERBS_CMD_CREATE_SRQ] = ib_uverbs_create_srq, 117 [IB_USER_VERBS_CMD_MODIFY_SRQ] = ib_uverbs_modify_srq, 118 [IB_USER_VERBS_CMD_QUERY_SRQ] = ib_uverbs_query_srq, 119 [IB_USER_VERBS_CMD_DESTROY_SRQ] = ib_uverbs_destroy_srq, 120 [IB_USER_VERBS_CMD_OPEN_XRCD] = ib_uverbs_open_xrcd, 121 [IB_USER_VERBS_CMD_CLOSE_XRCD] = ib_uverbs_close_xrcd, 122 [IB_USER_VERBS_CMD_CREATE_XSRQ] = ib_uverbs_create_xsrq, 123 [IB_USER_VERBS_CMD_OPEN_QP] = ib_uverbs_open_qp, 124 }; 125 126 static int (*uverbs_ex_cmd_table[])(struct ib_uverbs_file *file, 127 struct ib_device *ib_dev, 128 struct ib_udata *ucore, 129 struct ib_udata *uhw) = { 130 [IB_USER_VERBS_EX_CMD_CREATE_FLOW] = ib_uverbs_ex_create_flow, 131 [IB_USER_VERBS_EX_CMD_DESTROY_FLOW] = ib_uverbs_ex_destroy_flow, 132 [IB_USER_VERBS_EX_CMD_QUERY_DEVICE] = ib_uverbs_ex_query_device, 133 [IB_USER_VERBS_EX_CMD_CREATE_CQ] = ib_uverbs_ex_create_cq, 134 [IB_USER_VERBS_EX_CMD_CREATE_QP] = ib_uverbs_ex_create_qp, 135 [IB_USER_VERBS_EX_CMD_CREATE_WQ] = ib_uverbs_ex_create_wq, 136 [IB_USER_VERBS_EX_CMD_MODIFY_WQ] = ib_uverbs_ex_modify_wq, 137 [IB_USER_VERBS_EX_CMD_DESTROY_WQ] = ib_uverbs_ex_destroy_wq, 138 [IB_USER_VERBS_EX_CMD_CREATE_RWQ_IND_TBL] = ib_uverbs_ex_create_rwq_ind_table, 139 [IB_USER_VERBS_EX_CMD_DESTROY_RWQ_IND_TBL] = ib_uverbs_ex_destroy_rwq_ind_table, 140 }; 141 142 static void ib_uverbs_add_one(struct ib_device *device); 143 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); 144 145 int uverbs_dealloc_mw(struct ib_mw *mw) 146 { 147 struct ib_pd *pd = mw->pd; 148 int ret; 149 150 ret = mw->device->dealloc_mw(mw); 151 if (!ret) 152 atomic_dec(&pd->usecnt); 153 return ret; 154 } 155 156 static void ib_uverbs_release_dev(struct kobject *kobj) 157 { 158 struct ib_uverbs_device *dev = 159 container_of(kobj, struct ib_uverbs_device, kobj); 160 161 cleanup_srcu_struct(&dev->disassociate_srcu); 162 kfree(dev); 163 } 164 165 static struct kobj_type ib_uverbs_dev_ktype = { 166 .release = ib_uverbs_release_dev, 167 }; 168 169 static void ib_uverbs_release_event_file(struct kref *ref) 170 { 171 struct ib_uverbs_event_file *file = 172 container_of(ref, struct ib_uverbs_event_file, ref); 173 174 kfree(file); 175 } 176 177 void ib_uverbs_release_ucq(struct ib_uverbs_file *file, 178 struct ib_uverbs_event_file *ev_file, 179 struct ib_ucq_object *uobj) 180 { 181 struct ib_uverbs_event *evt, *tmp; 182 183 if (ev_file) { 184 spin_lock_irq(&ev_file->lock); 185 list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { 186 list_del(&evt->list); 187 kfree(evt); 188 } 189 spin_unlock_irq(&ev_file->lock); 190 191 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 192 } 193 194 spin_lock_irq(&file->async_file->lock); 195 list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { 196 list_del(&evt->list); 197 kfree(evt); 198 } 199 spin_unlock_irq(&file->async_file->lock); 200 } 201 202 void ib_uverbs_release_uevent(struct ib_uverbs_file *file, 203 struct ib_uevent_object *uobj) 204 { 205 struct ib_uverbs_event *evt, *tmp; 206 207 spin_lock_irq(&file->async_file->lock); 208 list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { 209 list_del(&evt->list); 210 kfree(evt); 211 } 212 spin_unlock_irq(&file->async_file->lock); 213 } 214 215 static void ib_uverbs_detach_umcast(struct ib_qp *qp, 216 struct ib_uqp_object *uobj) 217 { 218 struct ib_uverbs_mcast_entry *mcast, *tmp; 219 220 list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { 221 ib_detach_mcast(qp, &mcast->gid, mcast->lid); 222 list_del(&mcast->list); 223 kfree(mcast); 224 } 225 } 226 227 static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, 228 struct ib_ucontext *context) 229 { 230 struct ib_uobject *uobj, *tmp; 231 232 context->closing = 1; 233 234 list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { 235 struct ib_ah *ah = uobj->object; 236 237 idr_remove_uobj(&ib_uverbs_ah_idr, uobj); 238 ib_destroy_ah(ah); 239 kfree(uobj); 240 } 241 242 /* Remove MWs before QPs, in order to support type 2A MWs. */ 243 list_for_each_entry_safe(uobj, tmp, &context->mw_list, list) { 244 struct ib_mw *mw = uobj->object; 245 246 idr_remove_uobj(&ib_uverbs_mw_idr, uobj); 247 uverbs_dealloc_mw(mw); 248 kfree(uobj); 249 } 250 251 list_for_each_entry_safe(uobj, tmp, &context->rule_list, list) { 252 struct ib_flow *flow_id = uobj->object; 253 254 idr_remove_uobj(&ib_uverbs_rule_idr, uobj); 255 ib_destroy_flow(flow_id); 256 kfree(uobj); 257 } 258 259 list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { 260 struct ib_qp *qp = uobj->object; 261 struct ib_uqp_object *uqp = 262 container_of(uobj, struct ib_uqp_object, uevent.uobject); 263 264 idr_remove_uobj(&ib_uverbs_qp_idr, uobj); 265 if (qp != qp->real_qp) { 266 ib_close_qp(qp); 267 } else { 268 ib_uverbs_detach_umcast(qp, uqp); 269 ib_destroy_qp(qp); 270 } 271 ib_uverbs_release_uevent(file, &uqp->uevent); 272 kfree(uqp); 273 } 274 275 list_for_each_entry_safe(uobj, tmp, &context->rwq_ind_tbl_list, list) { 276 struct ib_rwq_ind_table *rwq_ind_tbl = uobj->object; 277 struct ib_wq **ind_tbl = rwq_ind_tbl->ind_tbl; 278 279 idr_remove_uobj(&ib_uverbs_rwq_ind_tbl_idr, uobj); 280 ib_destroy_rwq_ind_table(rwq_ind_tbl); 281 kfree(ind_tbl); 282 kfree(uobj); 283 } 284 285 list_for_each_entry_safe(uobj, tmp, &context->wq_list, list) { 286 struct ib_wq *wq = uobj->object; 287 struct ib_uwq_object *uwq = 288 container_of(uobj, struct ib_uwq_object, uevent.uobject); 289 290 idr_remove_uobj(&ib_uverbs_wq_idr, uobj); 291 ib_destroy_wq(wq); 292 ib_uverbs_release_uevent(file, &uwq->uevent); 293 kfree(uwq); 294 } 295 296 list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { 297 struct ib_srq *srq = uobj->object; 298 struct ib_uevent_object *uevent = 299 container_of(uobj, struct ib_uevent_object, uobject); 300 301 idr_remove_uobj(&ib_uverbs_srq_idr, uobj); 302 ib_destroy_srq(srq); 303 ib_uverbs_release_uevent(file, uevent); 304 kfree(uevent); 305 } 306 307 list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { 308 struct ib_cq *cq = uobj->object; 309 struct ib_uverbs_event_file *ev_file = cq->cq_context; 310 struct ib_ucq_object *ucq = 311 container_of(uobj, struct ib_ucq_object, uobject); 312 313 idr_remove_uobj(&ib_uverbs_cq_idr, uobj); 314 ib_destroy_cq(cq); 315 ib_uverbs_release_ucq(file, ev_file, ucq); 316 kfree(ucq); 317 } 318 319 list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { 320 struct ib_mr *mr = uobj->object; 321 322 idr_remove_uobj(&ib_uverbs_mr_idr, uobj); 323 ib_dereg_mr(mr); 324 kfree(uobj); 325 } 326 327 mutex_lock(&file->device->xrcd_tree_mutex); 328 list_for_each_entry_safe(uobj, tmp, &context->xrcd_list, list) { 329 struct ib_xrcd *xrcd = uobj->object; 330 struct ib_uxrcd_object *uxrcd = 331 container_of(uobj, struct ib_uxrcd_object, uobject); 332 333 idr_remove_uobj(&ib_uverbs_xrcd_idr, uobj); 334 ib_uverbs_dealloc_xrcd(file->device, xrcd); 335 kfree(uxrcd); 336 } 337 mutex_unlock(&file->device->xrcd_tree_mutex); 338 339 list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { 340 struct ib_pd *pd = uobj->object; 341 342 idr_remove_uobj(&ib_uverbs_pd_idr, uobj); 343 ib_dealloc_pd(pd); 344 kfree(uobj); 345 } 346 347 put_pid(context->tgid); 348 349 return context->device->dealloc_ucontext(context); 350 } 351 352 static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) 353 { 354 complete(&dev->comp); 355 } 356 357 static void ib_uverbs_release_file(struct kref *ref) 358 { 359 struct ib_uverbs_file *file = 360 container_of(ref, struct ib_uverbs_file, ref); 361 struct ib_device *ib_dev; 362 int srcu_key; 363 364 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 365 ib_dev = srcu_dereference(file->device->ib_dev, 366 &file->device->disassociate_srcu); 367 if (ib_dev && !ib_dev->disassociate_ucontext) 368 module_put(ib_dev->owner); 369 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 370 371 if (atomic_dec_and_test(&file->device->refcount)) 372 ib_uverbs_comp_dev(file->device); 373 374 kfree(file); 375 } 376 377 static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, 378 size_t count, loff_t *pos) 379 { 380 struct ib_uverbs_event_file *file = filp->private_data; 381 struct ib_uverbs_event *event; 382 int eventsz; 383 int ret = 0; 384 385 spin_lock_irq(&file->lock); 386 387 while (list_empty(&file->event_list)) { 388 spin_unlock_irq(&file->lock); 389 390 if (filp->f_flags & O_NONBLOCK) 391 return -EAGAIN; 392 393 if (wait_event_interruptible(file->poll_wait, 394 (!list_empty(&file->event_list) || 395 /* The barriers built into wait_event_interruptible() 396 * and wake_up() guarentee this will see the null set 397 * without using RCU 398 */ 399 !file->uverbs_file->device->ib_dev))) 400 return -ERESTARTSYS; 401 402 /* If device was disassociated and no event exists set an error */ 403 if (list_empty(&file->event_list) && 404 !file->uverbs_file->device->ib_dev) 405 return -EIO; 406 407 spin_lock_irq(&file->lock); 408 } 409 410 event = list_entry(file->event_list.next, struct ib_uverbs_event, list); 411 412 if (file->is_async) 413 eventsz = sizeof (struct ib_uverbs_async_event_desc); 414 else 415 eventsz = sizeof (struct ib_uverbs_comp_event_desc); 416 417 if (eventsz > count) { 418 ret = -EINVAL; 419 event = NULL; 420 } else { 421 list_del(file->event_list.next); 422 if (event->counter) { 423 ++(*event->counter); 424 list_del(&event->obj_list); 425 } 426 } 427 428 spin_unlock_irq(&file->lock); 429 430 if (event) { 431 if (copy_to_user(buf, event, eventsz)) 432 ret = -EFAULT; 433 else 434 ret = eventsz; 435 } 436 437 kfree(event); 438 439 return ret; 440 } 441 442 static unsigned int ib_uverbs_event_poll(struct file *filp, 443 struct poll_table_struct *wait) 444 { 445 unsigned int pollflags = 0; 446 struct ib_uverbs_event_file *file = filp->private_data; 447 448 poll_wait(filp, &file->poll_wait, wait); 449 450 spin_lock_irq(&file->lock); 451 if (!list_empty(&file->event_list)) 452 pollflags = POLLIN | POLLRDNORM; 453 spin_unlock_irq(&file->lock); 454 455 return pollflags; 456 } 457 458 static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) 459 { 460 struct ib_uverbs_event_file *file = filp->private_data; 461 462 return fasync_helper(fd, filp, on, &file->async_queue); 463 } 464 465 static int ib_uverbs_event_close(struct inode *inode, struct file *filp) 466 { 467 struct ib_uverbs_event_file *file = filp->private_data; 468 struct ib_uverbs_event *entry, *tmp; 469 int closed_already = 0; 470 471 mutex_lock(&file->uverbs_file->device->lists_mutex); 472 spin_lock_irq(&file->lock); 473 closed_already = file->is_closed; 474 file->is_closed = 1; 475 list_for_each_entry_safe(entry, tmp, &file->event_list, list) { 476 if (entry->counter) 477 list_del(&entry->obj_list); 478 kfree(entry); 479 } 480 spin_unlock_irq(&file->lock); 481 if (!closed_already) { 482 list_del(&file->list); 483 if (file->is_async) 484 ib_unregister_event_handler(&file->uverbs_file-> 485 event_handler); 486 } 487 mutex_unlock(&file->uverbs_file->device->lists_mutex); 488 489 kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); 490 kref_put(&file->ref, ib_uverbs_release_event_file); 491 492 return 0; 493 } 494 495 static const struct file_operations uverbs_event_fops = { 496 .owner = THIS_MODULE, 497 .read = ib_uverbs_event_read, 498 .poll = ib_uverbs_event_poll, 499 .release = ib_uverbs_event_close, 500 .fasync = ib_uverbs_event_fasync, 501 .llseek = no_llseek, 502 }; 503 504 void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) 505 { 506 struct ib_uverbs_event_file *file = cq_context; 507 struct ib_ucq_object *uobj; 508 struct ib_uverbs_event *entry; 509 unsigned long flags; 510 511 if (!file) 512 return; 513 514 spin_lock_irqsave(&file->lock, flags); 515 if (file->is_closed) { 516 spin_unlock_irqrestore(&file->lock, flags); 517 return; 518 } 519 520 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 521 if (!entry) { 522 spin_unlock_irqrestore(&file->lock, flags); 523 return; 524 } 525 526 uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); 527 528 entry->desc.comp.cq_handle = cq->uobject->user_handle; 529 entry->counter = &uobj->comp_events_reported; 530 531 list_add_tail(&entry->list, &file->event_list); 532 list_add_tail(&entry->obj_list, &uobj->comp_list); 533 spin_unlock_irqrestore(&file->lock, flags); 534 535 wake_up_interruptible(&file->poll_wait); 536 kill_fasync(&file->async_queue, SIGIO, POLL_IN); 537 } 538 539 static void ib_uverbs_async_handler(struct ib_uverbs_file *file, 540 __u64 element, __u64 event, 541 struct list_head *obj_list, 542 u32 *counter) 543 { 544 struct ib_uverbs_event *entry; 545 unsigned long flags; 546 547 spin_lock_irqsave(&file->async_file->lock, flags); 548 if (file->async_file->is_closed) { 549 spin_unlock_irqrestore(&file->async_file->lock, flags); 550 return; 551 } 552 553 entry = kmalloc(sizeof *entry, GFP_ATOMIC); 554 if (!entry) { 555 spin_unlock_irqrestore(&file->async_file->lock, flags); 556 return; 557 } 558 559 entry->desc.async.element = element; 560 entry->desc.async.event_type = event; 561 entry->desc.async.reserved = 0; 562 entry->counter = counter; 563 564 list_add_tail(&entry->list, &file->async_file->event_list); 565 if (obj_list) 566 list_add_tail(&entry->obj_list, obj_list); 567 spin_unlock_irqrestore(&file->async_file->lock, flags); 568 569 wake_up_interruptible(&file->async_file->poll_wait); 570 kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); 571 } 572 573 void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) 574 { 575 struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, 576 struct ib_ucq_object, uobject); 577 578 ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, 579 event->event, &uobj->async_list, 580 &uobj->async_events_reported); 581 } 582 583 void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) 584 { 585 struct ib_uevent_object *uobj; 586 587 /* for XRC target qp's, check that qp is live */ 588 if (!event->element.qp->uobject || !event->element.qp->uobject->live) 589 return; 590 591 uobj = container_of(event->element.qp->uobject, 592 struct ib_uevent_object, uobject); 593 594 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 595 event->event, &uobj->event_list, 596 &uobj->events_reported); 597 } 598 599 void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) 600 { 601 struct ib_uevent_object *uobj = container_of(event->element.wq->uobject, 602 struct ib_uevent_object, uobject); 603 604 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 605 event->event, &uobj->event_list, 606 &uobj->events_reported); 607 } 608 609 void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) 610 { 611 struct ib_uevent_object *uobj; 612 613 uobj = container_of(event->element.srq->uobject, 614 struct ib_uevent_object, uobject); 615 616 ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, 617 event->event, &uobj->event_list, 618 &uobj->events_reported); 619 } 620 621 void ib_uverbs_event_handler(struct ib_event_handler *handler, 622 struct ib_event *event) 623 { 624 struct ib_uverbs_file *file = 625 container_of(handler, struct ib_uverbs_file, event_handler); 626 627 ib_uverbs_async_handler(file, event->element.port_num, event->event, 628 NULL, NULL); 629 } 630 631 void ib_uverbs_free_async_event_file(struct ib_uverbs_file *file) 632 { 633 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 634 file->async_file = NULL; 635 } 636 637 struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, 638 struct ib_device *ib_dev, 639 int is_async) 640 { 641 struct ib_uverbs_event_file *ev_file; 642 struct file *filp; 643 int ret; 644 645 ev_file = kzalloc(sizeof(*ev_file), GFP_KERNEL); 646 if (!ev_file) 647 return ERR_PTR(-ENOMEM); 648 649 kref_init(&ev_file->ref); 650 spin_lock_init(&ev_file->lock); 651 INIT_LIST_HEAD(&ev_file->event_list); 652 init_waitqueue_head(&ev_file->poll_wait); 653 ev_file->uverbs_file = uverbs_file; 654 kref_get(&ev_file->uverbs_file->ref); 655 ev_file->async_queue = NULL; 656 ev_file->is_closed = 0; 657 658 filp = anon_inode_getfile("[infinibandevent]", &uverbs_event_fops, 659 ev_file, O_RDONLY); 660 if (IS_ERR(filp)) 661 goto err_put_refs; 662 663 mutex_lock(&uverbs_file->device->lists_mutex); 664 list_add_tail(&ev_file->list, 665 &uverbs_file->device->uverbs_events_file_list); 666 mutex_unlock(&uverbs_file->device->lists_mutex); 667 668 if (is_async) { 669 WARN_ON(uverbs_file->async_file); 670 uverbs_file->async_file = ev_file; 671 kref_get(&uverbs_file->async_file->ref); 672 INIT_IB_EVENT_HANDLER(&uverbs_file->event_handler, 673 ib_dev, 674 ib_uverbs_event_handler); 675 ret = ib_register_event_handler(&uverbs_file->event_handler); 676 if (ret) 677 goto err_put_file; 678 679 /* At that point async file stuff was fully set */ 680 ev_file->is_async = 1; 681 } 682 683 return filp; 684 685 err_put_file: 686 fput(filp); 687 kref_put(&uverbs_file->async_file->ref, ib_uverbs_release_event_file); 688 uverbs_file->async_file = NULL; 689 return ERR_PTR(ret); 690 691 err_put_refs: 692 kref_put(&ev_file->uverbs_file->ref, ib_uverbs_release_file); 693 kref_put(&ev_file->ref, ib_uverbs_release_event_file); 694 return filp; 695 } 696 697 /* 698 * Look up a completion event file by FD. If lookup is successful, 699 * takes a ref to the event file struct that it returns; if 700 * unsuccessful, returns NULL. 701 */ 702 struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) 703 { 704 struct ib_uverbs_event_file *ev_file = NULL; 705 struct fd f = fdget(fd); 706 707 if (!f.file) 708 return NULL; 709 710 if (f.file->f_op != &uverbs_event_fops) 711 goto out; 712 713 ev_file = f.file->private_data; 714 if (ev_file->is_async) { 715 ev_file = NULL; 716 goto out; 717 } 718 719 kref_get(&ev_file->ref); 720 721 out: 722 fdput(f); 723 return ev_file; 724 } 725 726 static int verify_command_mask(struct ib_device *ib_dev, __u32 command) 727 { 728 u64 mask; 729 730 if (command <= IB_USER_VERBS_CMD_OPEN_QP) 731 mask = ib_dev->uverbs_cmd_mask; 732 else 733 mask = ib_dev->uverbs_ex_cmd_mask; 734 735 if (mask & ((u64)1 << command)) 736 return 0; 737 738 return -1; 739 } 740 741 static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, 742 size_t count, loff_t *pos) 743 { 744 struct ib_uverbs_file *file = filp->private_data; 745 struct ib_device *ib_dev; 746 struct ib_uverbs_cmd_hdr hdr; 747 __u32 command; 748 __u32 flags; 749 int srcu_key; 750 ssize_t ret; 751 752 if (WARN_ON_ONCE(!ib_safe_file_access(filp))) 753 return -EACCES; 754 755 if (count < sizeof hdr) 756 return -EINVAL; 757 758 if (copy_from_user(&hdr, buf, sizeof hdr)) 759 return -EFAULT; 760 761 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 762 ib_dev = srcu_dereference(file->device->ib_dev, 763 &file->device->disassociate_srcu); 764 if (!ib_dev) { 765 ret = -EIO; 766 goto out; 767 } 768 769 if (hdr.command & ~(__u32)(IB_USER_VERBS_CMD_FLAGS_MASK | 770 IB_USER_VERBS_CMD_COMMAND_MASK)) { 771 ret = -EINVAL; 772 goto out; 773 } 774 775 command = hdr.command & IB_USER_VERBS_CMD_COMMAND_MASK; 776 if (verify_command_mask(ib_dev, command)) { 777 ret = -EOPNOTSUPP; 778 goto out; 779 } 780 781 if (!file->ucontext && 782 command != IB_USER_VERBS_CMD_GET_CONTEXT) { 783 ret = -EINVAL; 784 goto out; 785 } 786 787 flags = (hdr.command & 788 IB_USER_VERBS_CMD_FLAGS_MASK) >> IB_USER_VERBS_CMD_FLAGS_SHIFT; 789 790 if (!flags) { 791 if (command >= ARRAY_SIZE(uverbs_cmd_table) || 792 !uverbs_cmd_table[command]) { 793 ret = -EINVAL; 794 goto out; 795 } 796 797 if (hdr.in_words * 4 != count) { 798 ret = -EINVAL; 799 goto out; 800 } 801 802 ret = uverbs_cmd_table[command](file, ib_dev, 803 buf + sizeof(hdr), 804 hdr.in_words * 4, 805 hdr.out_words * 4); 806 807 } else if (flags == IB_USER_VERBS_CMD_FLAG_EXTENDED) { 808 struct ib_uverbs_ex_cmd_hdr ex_hdr; 809 struct ib_udata ucore; 810 struct ib_udata uhw; 811 size_t written_count = count; 812 813 if (command >= ARRAY_SIZE(uverbs_ex_cmd_table) || 814 !uverbs_ex_cmd_table[command]) { 815 ret = -ENOSYS; 816 goto out; 817 } 818 819 if (!file->ucontext) { 820 ret = -EINVAL; 821 goto out; 822 } 823 824 if (count < (sizeof(hdr) + sizeof(ex_hdr))) { 825 ret = -EINVAL; 826 goto out; 827 } 828 829 if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) { 830 ret = -EFAULT; 831 goto out; 832 } 833 834 count -= sizeof(hdr) + sizeof(ex_hdr); 835 buf += sizeof(hdr) + sizeof(ex_hdr); 836 837 if ((hdr.in_words + ex_hdr.provider_in_words) * 8 != count) { 838 ret = -EINVAL; 839 goto out; 840 } 841 842 if (ex_hdr.cmd_hdr_reserved) { 843 ret = -EINVAL; 844 goto out; 845 } 846 847 if (ex_hdr.response) { 848 if (!hdr.out_words && !ex_hdr.provider_out_words) { 849 ret = -EINVAL; 850 goto out; 851 } 852 853 if (!access_ok(VERIFY_WRITE, 854 (void __user *) (unsigned long) ex_hdr.response, 855 (hdr.out_words + ex_hdr.provider_out_words) * 8)) { 856 ret = -EFAULT; 857 goto out; 858 } 859 } else { 860 if (hdr.out_words || ex_hdr.provider_out_words) { 861 ret = -EINVAL; 862 goto out; 863 } 864 } 865 866 INIT_UDATA_BUF_OR_NULL(&ucore, buf, (unsigned long) ex_hdr.response, 867 hdr.in_words * 8, hdr.out_words * 8); 868 869 INIT_UDATA_BUF_OR_NULL(&uhw, 870 buf + ucore.inlen, 871 (unsigned long) ex_hdr.response + ucore.outlen, 872 ex_hdr.provider_in_words * 8, 873 ex_hdr.provider_out_words * 8); 874 875 ret = uverbs_ex_cmd_table[command](file, 876 ib_dev, 877 &ucore, 878 &uhw); 879 if (!ret) 880 ret = written_count; 881 } else { 882 ret = -ENOSYS; 883 } 884 885 out: 886 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 887 return ret; 888 } 889 890 static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) 891 { 892 struct ib_uverbs_file *file = filp->private_data; 893 struct ib_device *ib_dev; 894 int ret = 0; 895 int srcu_key; 896 897 srcu_key = srcu_read_lock(&file->device->disassociate_srcu); 898 ib_dev = srcu_dereference(file->device->ib_dev, 899 &file->device->disassociate_srcu); 900 if (!ib_dev) { 901 ret = -EIO; 902 goto out; 903 } 904 905 if (!file->ucontext) 906 ret = -ENODEV; 907 else 908 ret = ib_dev->mmap(file->ucontext, vma); 909 out: 910 srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); 911 return ret; 912 } 913 914 /* 915 * ib_uverbs_open() does not need the BKL: 916 * 917 * - the ib_uverbs_device structures are properly reference counted and 918 * everything else is purely local to the file being created, so 919 * races against other open calls are not a problem; 920 * - there is no ioctl method to race against; 921 * - the open method will either immediately run -ENXIO, or all 922 * required initialization will be done. 923 */ 924 static int ib_uverbs_open(struct inode *inode, struct file *filp) 925 { 926 struct ib_uverbs_device *dev; 927 struct ib_uverbs_file *file; 928 struct ib_device *ib_dev; 929 int ret; 930 int module_dependent; 931 int srcu_key; 932 933 dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); 934 if (!atomic_inc_not_zero(&dev->refcount)) 935 return -ENXIO; 936 937 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 938 mutex_lock(&dev->lists_mutex); 939 ib_dev = srcu_dereference(dev->ib_dev, 940 &dev->disassociate_srcu); 941 if (!ib_dev) { 942 ret = -EIO; 943 goto err; 944 } 945 946 /* In case IB device supports disassociate ucontext, there is no hard 947 * dependency between uverbs device and its low level device. 948 */ 949 module_dependent = !(ib_dev->disassociate_ucontext); 950 951 if (module_dependent) { 952 if (!try_module_get(ib_dev->owner)) { 953 ret = -ENODEV; 954 goto err; 955 } 956 } 957 958 file = kzalloc(sizeof(*file), GFP_KERNEL); 959 if (!file) { 960 ret = -ENOMEM; 961 if (module_dependent) 962 goto err_module; 963 964 goto err; 965 } 966 967 file->device = dev; 968 file->ucontext = NULL; 969 file->async_file = NULL; 970 kref_init(&file->ref); 971 mutex_init(&file->mutex); 972 mutex_init(&file->cleanup_mutex); 973 974 filp->private_data = file; 975 kobject_get(&dev->kobj); 976 list_add_tail(&file->list, &dev->uverbs_file_list); 977 mutex_unlock(&dev->lists_mutex); 978 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 979 980 return nonseekable_open(inode, filp); 981 982 err_module: 983 module_put(ib_dev->owner); 984 985 err: 986 mutex_unlock(&dev->lists_mutex); 987 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 988 if (atomic_dec_and_test(&dev->refcount)) 989 ib_uverbs_comp_dev(dev); 990 991 return ret; 992 } 993 994 static int ib_uverbs_close(struct inode *inode, struct file *filp) 995 { 996 struct ib_uverbs_file *file = filp->private_data; 997 struct ib_uverbs_device *dev = file->device; 998 999 mutex_lock(&file->cleanup_mutex); 1000 if (file->ucontext) { 1001 ib_uverbs_cleanup_ucontext(file, file->ucontext); 1002 file->ucontext = NULL; 1003 } 1004 mutex_unlock(&file->cleanup_mutex); 1005 1006 mutex_lock(&file->device->lists_mutex); 1007 if (!file->is_closed) { 1008 list_del(&file->list); 1009 file->is_closed = 1; 1010 } 1011 mutex_unlock(&file->device->lists_mutex); 1012 1013 if (file->async_file) 1014 kref_put(&file->async_file->ref, ib_uverbs_release_event_file); 1015 1016 kref_put(&file->ref, ib_uverbs_release_file); 1017 kobject_put(&dev->kobj); 1018 1019 return 0; 1020 } 1021 1022 static const struct file_operations uverbs_fops = { 1023 .owner = THIS_MODULE, 1024 .write = ib_uverbs_write, 1025 .open = ib_uverbs_open, 1026 .release = ib_uverbs_close, 1027 .llseek = no_llseek, 1028 }; 1029 1030 static const struct file_operations uverbs_mmap_fops = { 1031 .owner = THIS_MODULE, 1032 .write = ib_uverbs_write, 1033 .mmap = ib_uverbs_mmap, 1034 .open = ib_uverbs_open, 1035 .release = ib_uverbs_close, 1036 .llseek = no_llseek, 1037 }; 1038 1039 static struct ib_client uverbs_client = { 1040 .name = "uverbs", 1041 .add = ib_uverbs_add_one, 1042 .remove = ib_uverbs_remove_one 1043 }; 1044 1045 static ssize_t show_ibdev(struct device *device, struct device_attribute *attr, 1046 char *buf) 1047 { 1048 int ret = -ENODEV; 1049 int srcu_key; 1050 struct ib_uverbs_device *dev = dev_get_drvdata(device); 1051 struct ib_device *ib_dev; 1052 1053 if (!dev) 1054 return -ENODEV; 1055 1056 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1057 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1058 if (ib_dev) 1059 ret = sprintf(buf, "%s\n", ib_dev->name); 1060 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1061 1062 return ret; 1063 } 1064 static DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); 1065 1066 static ssize_t show_dev_abi_version(struct device *device, 1067 struct device_attribute *attr, char *buf) 1068 { 1069 struct ib_uverbs_device *dev = dev_get_drvdata(device); 1070 int ret = -ENODEV; 1071 int srcu_key; 1072 struct ib_device *ib_dev; 1073 1074 if (!dev) 1075 return -ENODEV; 1076 srcu_key = srcu_read_lock(&dev->disassociate_srcu); 1077 ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); 1078 if (ib_dev) 1079 ret = sprintf(buf, "%d\n", ib_dev->uverbs_abi_ver); 1080 srcu_read_unlock(&dev->disassociate_srcu, srcu_key); 1081 1082 return ret; 1083 } 1084 static DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); 1085 1086 static CLASS_ATTR_STRING(abi_version, S_IRUGO, 1087 __stringify(IB_USER_VERBS_ABI_VERSION)); 1088 1089 static dev_t overflow_maj; 1090 static DECLARE_BITMAP(overflow_map, IB_UVERBS_MAX_DEVICES); 1091 1092 /* 1093 * If we have more than IB_UVERBS_MAX_DEVICES, dynamically overflow by 1094 * requesting a new major number and doubling the number of max devices we 1095 * support. It's stupid, but simple. 1096 */ 1097 static int find_overflow_devnum(void) 1098 { 1099 int ret; 1100 1101 if (!overflow_maj) { 1102 ret = alloc_chrdev_region(&overflow_maj, 0, IB_UVERBS_MAX_DEVICES, 1103 "infiniband_verbs"); 1104 if (ret) { 1105 pr_err("user_verbs: couldn't register dynamic device number\n"); 1106 return ret; 1107 } 1108 } 1109 1110 ret = find_first_zero_bit(overflow_map, IB_UVERBS_MAX_DEVICES); 1111 if (ret >= IB_UVERBS_MAX_DEVICES) 1112 return -1; 1113 1114 return ret; 1115 } 1116 1117 static void ib_uverbs_add_one(struct ib_device *device) 1118 { 1119 int devnum; 1120 dev_t base; 1121 struct ib_uverbs_device *uverbs_dev; 1122 int ret; 1123 1124 if (!device->alloc_ucontext) 1125 return; 1126 1127 uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); 1128 if (!uverbs_dev) 1129 return; 1130 1131 ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); 1132 if (ret) { 1133 kfree(uverbs_dev); 1134 return; 1135 } 1136 1137 atomic_set(&uverbs_dev->refcount, 1); 1138 init_completion(&uverbs_dev->comp); 1139 uverbs_dev->xrcd_tree = RB_ROOT; 1140 mutex_init(&uverbs_dev->xrcd_tree_mutex); 1141 kobject_init(&uverbs_dev->kobj, &ib_uverbs_dev_ktype); 1142 mutex_init(&uverbs_dev->lists_mutex); 1143 INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); 1144 INIT_LIST_HEAD(&uverbs_dev->uverbs_events_file_list); 1145 1146 spin_lock(&map_lock); 1147 devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); 1148 if (devnum >= IB_UVERBS_MAX_DEVICES) { 1149 spin_unlock(&map_lock); 1150 devnum = find_overflow_devnum(); 1151 if (devnum < 0) 1152 goto err; 1153 1154 spin_lock(&map_lock); 1155 uverbs_dev->devnum = devnum + IB_UVERBS_MAX_DEVICES; 1156 base = devnum + overflow_maj; 1157 set_bit(devnum, overflow_map); 1158 } else { 1159 uverbs_dev->devnum = devnum; 1160 base = devnum + IB_UVERBS_BASE_DEV; 1161 set_bit(devnum, dev_map); 1162 } 1163 spin_unlock(&map_lock); 1164 1165 rcu_assign_pointer(uverbs_dev->ib_dev, device); 1166 uverbs_dev->num_comp_vectors = device->num_comp_vectors; 1167 1168 cdev_init(&uverbs_dev->cdev, NULL); 1169 uverbs_dev->cdev.owner = THIS_MODULE; 1170 uverbs_dev->cdev.ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; 1171 uverbs_dev->cdev.kobj.parent = &uverbs_dev->kobj; 1172 kobject_set_name(&uverbs_dev->cdev.kobj, "uverbs%d", uverbs_dev->devnum); 1173 if (cdev_add(&uverbs_dev->cdev, base, 1)) 1174 goto err_cdev; 1175 1176 uverbs_dev->dev = device_create(uverbs_class, device->dma_device, 1177 uverbs_dev->cdev.dev, uverbs_dev, 1178 "uverbs%d", uverbs_dev->devnum); 1179 if (IS_ERR(uverbs_dev->dev)) 1180 goto err_cdev; 1181 1182 if (device_create_file(uverbs_dev->dev, &dev_attr_ibdev)) 1183 goto err_class; 1184 if (device_create_file(uverbs_dev->dev, &dev_attr_abi_version)) 1185 goto err_class; 1186 1187 ib_set_client_data(device, &uverbs_client, uverbs_dev); 1188 1189 return; 1190 1191 err_class: 1192 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1193 1194 err_cdev: 1195 cdev_del(&uverbs_dev->cdev); 1196 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1197 clear_bit(devnum, dev_map); 1198 else 1199 clear_bit(devnum, overflow_map); 1200 1201 err: 1202 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1203 ib_uverbs_comp_dev(uverbs_dev); 1204 wait_for_completion(&uverbs_dev->comp); 1205 kobject_put(&uverbs_dev->kobj); 1206 return; 1207 } 1208 1209 static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, 1210 struct ib_device *ib_dev) 1211 { 1212 struct ib_uverbs_file *file; 1213 struct ib_uverbs_event_file *event_file; 1214 struct ib_event event; 1215 1216 /* Pending running commands to terminate */ 1217 synchronize_srcu(&uverbs_dev->disassociate_srcu); 1218 event.event = IB_EVENT_DEVICE_FATAL; 1219 event.element.port_num = 0; 1220 event.device = ib_dev; 1221 1222 mutex_lock(&uverbs_dev->lists_mutex); 1223 while (!list_empty(&uverbs_dev->uverbs_file_list)) { 1224 struct ib_ucontext *ucontext; 1225 file = list_first_entry(&uverbs_dev->uverbs_file_list, 1226 struct ib_uverbs_file, list); 1227 file->is_closed = 1; 1228 list_del(&file->list); 1229 kref_get(&file->ref); 1230 mutex_unlock(&uverbs_dev->lists_mutex); 1231 1232 ib_uverbs_event_handler(&file->event_handler, &event); 1233 1234 mutex_lock(&file->cleanup_mutex); 1235 ucontext = file->ucontext; 1236 file->ucontext = NULL; 1237 mutex_unlock(&file->cleanup_mutex); 1238 1239 /* At this point ib_uverbs_close cannot be running 1240 * ib_uverbs_cleanup_ucontext 1241 */ 1242 if (ucontext) { 1243 /* We must release the mutex before going ahead and 1244 * calling disassociate_ucontext. disassociate_ucontext 1245 * might end up indirectly calling uverbs_close, 1246 * for example due to freeing the resources 1247 * (e.g mmput). 1248 */ 1249 ib_dev->disassociate_ucontext(ucontext); 1250 ib_uverbs_cleanup_ucontext(file, ucontext); 1251 } 1252 1253 mutex_lock(&uverbs_dev->lists_mutex); 1254 kref_put(&file->ref, ib_uverbs_release_file); 1255 } 1256 1257 while (!list_empty(&uverbs_dev->uverbs_events_file_list)) { 1258 event_file = list_first_entry(&uverbs_dev-> 1259 uverbs_events_file_list, 1260 struct ib_uverbs_event_file, 1261 list); 1262 spin_lock_irq(&event_file->lock); 1263 event_file->is_closed = 1; 1264 spin_unlock_irq(&event_file->lock); 1265 1266 list_del(&event_file->list); 1267 if (event_file->is_async) { 1268 ib_unregister_event_handler(&event_file->uverbs_file-> 1269 event_handler); 1270 event_file->uverbs_file->event_handler.device = NULL; 1271 } 1272 1273 wake_up_interruptible(&event_file->poll_wait); 1274 kill_fasync(&event_file->async_queue, SIGIO, POLL_IN); 1275 } 1276 mutex_unlock(&uverbs_dev->lists_mutex); 1277 } 1278 1279 static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) 1280 { 1281 struct ib_uverbs_device *uverbs_dev = client_data; 1282 int wait_clients = 1; 1283 1284 if (!uverbs_dev) 1285 return; 1286 1287 dev_set_drvdata(uverbs_dev->dev, NULL); 1288 device_destroy(uverbs_class, uverbs_dev->cdev.dev); 1289 cdev_del(&uverbs_dev->cdev); 1290 1291 if (uverbs_dev->devnum < IB_UVERBS_MAX_DEVICES) 1292 clear_bit(uverbs_dev->devnum, dev_map); 1293 else 1294 clear_bit(uverbs_dev->devnum - IB_UVERBS_MAX_DEVICES, overflow_map); 1295 1296 if (device->disassociate_ucontext) { 1297 /* We disassociate HW resources and immediately return. 1298 * Userspace will see a EIO errno for all future access. 1299 * Upon returning, ib_device may be freed internally and is not 1300 * valid any more. 1301 * uverbs_device is still available until all clients close 1302 * their files, then the uverbs device ref count will be zero 1303 * and its resources will be freed. 1304 * Note: At this point no more files can be opened since the 1305 * cdev was deleted, however active clients can still issue 1306 * commands and close their open files. 1307 */ 1308 rcu_assign_pointer(uverbs_dev->ib_dev, NULL); 1309 ib_uverbs_free_hw_resources(uverbs_dev, device); 1310 wait_clients = 0; 1311 } 1312 1313 if (atomic_dec_and_test(&uverbs_dev->refcount)) 1314 ib_uverbs_comp_dev(uverbs_dev); 1315 if (wait_clients) 1316 wait_for_completion(&uverbs_dev->comp); 1317 kobject_put(&uverbs_dev->kobj); 1318 } 1319 1320 static char *uverbs_devnode(struct device *dev, umode_t *mode) 1321 { 1322 if (mode) 1323 *mode = 0666; 1324 return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); 1325 } 1326 1327 static int __init ib_uverbs_init(void) 1328 { 1329 int ret; 1330 1331 ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, 1332 "infiniband_verbs"); 1333 if (ret) { 1334 pr_err("user_verbs: couldn't register device number\n"); 1335 goto out; 1336 } 1337 1338 uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); 1339 if (IS_ERR(uverbs_class)) { 1340 ret = PTR_ERR(uverbs_class); 1341 pr_err("user_verbs: couldn't create class infiniband_verbs\n"); 1342 goto out_chrdev; 1343 } 1344 1345 uverbs_class->devnode = uverbs_devnode; 1346 1347 ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); 1348 if (ret) { 1349 pr_err("user_verbs: couldn't create abi_version attribute\n"); 1350 goto out_class; 1351 } 1352 1353 ret = ib_register_client(&uverbs_client); 1354 if (ret) { 1355 pr_err("user_verbs: couldn't register client\n"); 1356 goto out_class; 1357 } 1358 1359 return 0; 1360 1361 out_class: 1362 class_destroy(uverbs_class); 1363 1364 out_chrdev: 1365 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1366 1367 out: 1368 return ret; 1369 } 1370 1371 static void __exit ib_uverbs_cleanup(void) 1372 { 1373 ib_unregister_client(&uverbs_client); 1374 class_destroy(uverbs_class); 1375 unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); 1376 if (overflow_maj) 1377 unregister_chrdev_region(overflow_maj, IB_UVERBS_MAX_DEVICES); 1378 idr_destroy(&ib_uverbs_pd_idr); 1379 idr_destroy(&ib_uverbs_mr_idr); 1380 idr_destroy(&ib_uverbs_mw_idr); 1381 idr_destroy(&ib_uverbs_ah_idr); 1382 idr_destroy(&ib_uverbs_cq_idr); 1383 idr_destroy(&ib_uverbs_qp_idr); 1384 idr_destroy(&ib_uverbs_srq_idr); 1385 } 1386 1387 module_init(ib_uverbs_init); 1388 module_exit(ib_uverbs_cleanup); 1389