| 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 | * $Id: uverbs_main.c 2733 2005-06-28 19:14:34Z roland $ |
| 37 | */ |
| 38 | |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/init.h> |
| 41 | #include <linux/device.h> |
| 42 | #include <linux/err.h> |
| 43 | #include <linux/fs.h> |
| 44 | #include <linux/poll.h> |
| 45 | #include <linux/file.h> |
| 46 | #include <linux/mount.h> |
| 47 | #include <linux/cdev.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 | #define INFINIBANDEVENTFS_MAGIC 0x49426576 /* "IBev" */ |
| 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 | |
| 78 | static spinlock_t map_lock; |
| 79 | static struct ib_uverbs_device *dev_table[IB_UVERBS_MAX_DEVICES]; |
| 80 | static DECLARE_BITMAP(dev_map, IB_UVERBS_MAX_DEVICES); |
| 81 | |
| 82 | static ssize_t (*uverbs_cmd_table[])(struct ib_uverbs_file *file, |
| 83 | const char __user *buf, int in_len, |
| 84 | int out_len) = { |
| 85 | [IB_USER_VERBS_CMD_GET_CONTEXT] = ib_uverbs_get_context, |
| 86 | [IB_USER_VERBS_CMD_QUERY_DEVICE] = ib_uverbs_query_device, |
| 87 | [IB_USER_VERBS_CMD_QUERY_PORT] = ib_uverbs_query_port, |
| 88 | [IB_USER_VERBS_CMD_ALLOC_PD] = ib_uverbs_alloc_pd, |
| 89 | [IB_USER_VERBS_CMD_DEALLOC_PD] = ib_uverbs_dealloc_pd, |
| 90 | [IB_USER_VERBS_CMD_REG_MR] = ib_uverbs_reg_mr, |
| 91 | [IB_USER_VERBS_CMD_DEREG_MR] = ib_uverbs_dereg_mr, |
| 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 | }; |
| 114 | |
| 115 | static struct vfsmount *uverbs_event_mnt; |
| 116 | |
| 117 | static void ib_uverbs_add_one(struct ib_device *device); |
| 118 | static void ib_uverbs_remove_one(struct ib_device *device); |
| 119 | |
| 120 | static void ib_uverbs_release_dev(struct kref *ref) |
| 121 | { |
| 122 | struct ib_uverbs_device *dev = |
| 123 | container_of(ref, struct ib_uverbs_device, ref); |
| 124 | |
| 125 | complete(&dev->comp); |
| 126 | } |
| 127 | |
| 128 | static void ib_uverbs_release_event_file(struct kref *ref) |
| 129 | { |
| 130 | struct ib_uverbs_event_file *file = |
| 131 | container_of(ref, struct ib_uverbs_event_file, ref); |
| 132 | |
| 133 | kfree(file); |
| 134 | } |
| 135 | |
| 136 | void ib_uverbs_release_ucq(struct ib_uverbs_file *file, |
| 137 | struct ib_uverbs_event_file *ev_file, |
| 138 | struct ib_ucq_object *uobj) |
| 139 | { |
| 140 | struct ib_uverbs_event *evt, *tmp; |
| 141 | |
| 142 | if (ev_file) { |
| 143 | spin_lock_irq(&ev_file->lock); |
| 144 | list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { |
| 145 | list_del(&evt->list); |
| 146 | kfree(evt); |
| 147 | } |
| 148 | spin_unlock_irq(&ev_file->lock); |
| 149 | |
| 150 | kref_put(&ev_file->ref, ib_uverbs_release_event_file); |
| 151 | } |
| 152 | |
| 153 | spin_lock_irq(&file->async_file->lock); |
| 154 | list_for_each_entry_safe(evt, tmp, &uobj->async_list, obj_list) { |
| 155 | list_del(&evt->list); |
| 156 | kfree(evt); |
| 157 | } |
| 158 | spin_unlock_irq(&file->async_file->lock); |
| 159 | } |
| 160 | |
| 161 | void ib_uverbs_release_uevent(struct ib_uverbs_file *file, |
| 162 | struct ib_uevent_object *uobj) |
| 163 | { |
| 164 | struct ib_uverbs_event *evt, *tmp; |
| 165 | |
| 166 | spin_lock_irq(&file->async_file->lock); |
| 167 | list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { |
| 168 | list_del(&evt->list); |
| 169 | kfree(evt); |
| 170 | } |
| 171 | spin_unlock_irq(&file->async_file->lock); |
| 172 | } |
| 173 | |
| 174 | static void ib_uverbs_detach_umcast(struct ib_qp *qp, |
| 175 | struct ib_uqp_object *uobj) |
| 176 | { |
| 177 | struct ib_uverbs_mcast_entry *mcast, *tmp; |
| 178 | |
| 179 | list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { |
| 180 | ib_detach_mcast(qp, &mcast->gid, mcast->lid); |
| 181 | list_del(&mcast->list); |
| 182 | kfree(mcast); |
| 183 | } |
| 184 | } |
| 185 | |
| 186 | static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, |
| 187 | struct ib_ucontext *context) |
| 188 | { |
| 189 | struct ib_uobject *uobj, *tmp; |
| 190 | |
| 191 | if (!context) |
| 192 | return 0; |
| 193 | |
| 194 | context->closing = 1; |
| 195 | |
| 196 | list_for_each_entry_safe(uobj, tmp, &context->ah_list, list) { |
| 197 | struct ib_ah *ah = uobj->object; |
| 198 | |
| 199 | idr_remove_uobj(&ib_uverbs_ah_idr, uobj); |
| 200 | ib_destroy_ah(ah); |
| 201 | kfree(uobj); |
| 202 | } |
| 203 | |
| 204 | list_for_each_entry_safe(uobj, tmp, &context->qp_list, list) { |
| 205 | struct ib_qp *qp = uobj->object; |
| 206 | struct ib_uqp_object *uqp = |
| 207 | container_of(uobj, struct ib_uqp_object, uevent.uobject); |
| 208 | |
| 209 | idr_remove_uobj(&ib_uverbs_qp_idr, uobj); |
| 210 | ib_uverbs_detach_umcast(qp, uqp); |
| 211 | ib_destroy_qp(qp); |
| 212 | ib_uverbs_release_uevent(file, &uqp->uevent); |
| 213 | kfree(uqp); |
| 214 | } |
| 215 | |
| 216 | list_for_each_entry_safe(uobj, tmp, &context->cq_list, list) { |
| 217 | struct ib_cq *cq = uobj->object; |
| 218 | struct ib_uverbs_event_file *ev_file = cq->cq_context; |
| 219 | struct ib_ucq_object *ucq = |
| 220 | container_of(uobj, struct ib_ucq_object, uobject); |
| 221 | |
| 222 | idr_remove_uobj(&ib_uverbs_cq_idr, uobj); |
| 223 | ib_destroy_cq(cq); |
| 224 | ib_uverbs_release_ucq(file, ev_file, ucq); |
| 225 | kfree(ucq); |
| 226 | } |
| 227 | |
| 228 | list_for_each_entry_safe(uobj, tmp, &context->srq_list, list) { |
| 229 | struct ib_srq *srq = uobj->object; |
| 230 | struct ib_uevent_object *uevent = |
| 231 | container_of(uobj, struct ib_uevent_object, uobject); |
| 232 | |
| 233 | idr_remove_uobj(&ib_uverbs_srq_idr, uobj); |
| 234 | ib_destroy_srq(srq); |
| 235 | ib_uverbs_release_uevent(file, uevent); |
| 236 | kfree(uevent); |
| 237 | } |
| 238 | |
| 239 | /* XXX Free MWs */ |
| 240 | |
| 241 | list_for_each_entry_safe(uobj, tmp, &context->mr_list, list) { |
| 242 | struct ib_mr *mr = uobj->object; |
| 243 | |
| 244 | idr_remove_uobj(&ib_uverbs_mr_idr, uobj); |
| 245 | ib_dereg_mr(mr); |
| 246 | kfree(uobj); |
| 247 | } |
| 248 | |
| 249 | list_for_each_entry_safe(uobj, tmp, &context->pd_list, list) { |
| 250 | struct ib_pd *pd = uobj->object; |
| 251 | |
| 252 | idr_remove_uobj(&ib_uverbs_pd_idr, uobj); |
| 253 | ib_dealloc_pd(pd); |
| 254 | kfree(uobj); |
| 255 | } |
| 256 | |
| 257 | return context->device->dealloc_ucontext(context); |
| 258 | } |
| 259 | |
| 260 | static void ib_uverbs_release_file(struct kref *ref) |
| 261 | { |
| 262 | struct ib_uverbs_file *file = |
| 263 | container_of(ref, struct ib_uverbs_file, ref); |
| 264 | |
| 265 | module_put(file->device->ib_dev->owner); |
| 266 | kref_put(&file->device->ref, ib_uverbs_release_dev); |
| 267 | |
| 268 | kfree(file); |
| 269 | } |
| 270 | |
| 271 | static ssize_t ib_uverbs_event_read(struct file *filp, char __user *buf, |
| 272 | size_t count, loff_t *pos) |
| 273 | { |
| 274 | struct ib_uverbs_event_file *file = filp->private_data; |
| 275 | struct ib_uverbs_event *event; |
| 276 | int eventsz; |
| 277 | int ret = 0; |
| 278 | |
| 279 | spin_lock_irq(&file->lock); |
| 280 | |
| 281 | while (list_empty(&file->event_list)) { |
| 282 | spin_unlock_irq(&file->lock); |
| 283 | |
| 284 | if (filp->f_flags & O_NONBLOCK) |
| 285 | return -EAGAIN; |
| 286 | |
| 287 | if (wait_event_interruptible(file->poll_wait, |
| 288 | !list_empty(&file->event_list))) |
| 289 | return -ERESTARTSYS; |
| 290 | |
| 291 | spin_lock_irq(&file->lock); |
| 292 | } |
| 293 | |
| 294 | event = list_entry(file->event_list.next, struct ib_uverbs_event, list); |
| 295 | |
| 296 | if (file->is_async) |
| 297 | eventsz = sizeof (struct ib_uverbs_async_event_desc); |
| 298 | else |
| 299 | eventsz = sizeof (struct ib_uverbs_comp_event_desc); |
| 300 | |
| 301 | if (eventsz > count) { |
| 302 | ret = -EINVAL; |
| 303 | event = NULL; |
| 304 | } else { |
| 305 | list_del(file->event_list.next); |
| 306 | if (event->counter) { |
| 307 | ++(*event->counter); |
| 308 | list_del(&event->obj_list); |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | spin_unlock_irq(&file->lock); |
| 313 | |
| 314 | if (event) { |
| 315 | if (copy_to_user(buf, event, eventsz)) |
| 316 | ret = -EFAULT; |
| 317 | else |
| 318 | ret = eventsz; |
| 319 | } |
| 320 | |
| 321 | kfree(event); |
| 322 | |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | static unsigned int ib_uverbs_event_poll(struct file *filp, |
| 327 | struct poll_table_struct *wait) |
| 328 | { |
| 329 | unsigned int pollflags = 0; |
| 330 | struct ib_uverbs_event_file *file = filp->private_data; |
| 331 | |
| 332 | poll_wait(filp, &file->poll_wait, wait); |
| 333 | |
| 334 | spin_lock_irq(&file->lock); |
| 335 | if (!list_empty(&file->event_list)) |
| 336 | pollflags = POLLIN | POLLRDNORM; |
| 337 | spin_unlock_irq(&file->lock); |
| 338 | |
| 339 | return pollflags; |
| 340 | } |
| 341 | |
| 342 | static int ib_uverbs_event_fasync(int fd, struct file *filp, int on) |
| 343 | { |
| 344 | struct ib_uverbs_event_file *file = filp->private_data; |
| 345 | |
| 346 | return fasync_helper(fd, filp, on, &file->async_queue); |
| 347 | } |
| 348 | |
| 349 | static int ib_uverbs_event_close(struct inode *inode, struct file *filp) |
| 350 | { |
| 351 | struct ib_uverbs_event_file *file = filp->private_data; |
| 352 | struct ib_uverbs_event *entry, *tmp; |
| 353 | |
| 354 | spin_lock_irq(&file->lock); |
| 355 | file->is_closed = 1; |
| 356 | list_for_each_entry_safe(entry, tmp, &file->event_list, list) { |
| 357 | if (entry->counter) |
| 358 | list_del(&entry->obj_list); |
| 359 | kfree(entry); |
| 360 | } |
| 361 | spin_unlock_irq(&file->lock); |
| 362 | |
| 363 | ib_uverbs_event_fasync(-1, filp, 0); |
| 364 | |
| 365 | if (file->is_async) { |
| 366 | ib_unregister_event_handler(&file->uverbs_file->event_handler); |
| 367 | kref_put(&file->uverbs_file->ref, ib_uverbs_release_file); |
| 368 | } |
| 369 | kref_put(&file->ref, ib_uverbs_release_event_file); |
| 370 | |
| 371 | return 0; |
| 372 | } |
| 373 | |
| 374 | static const struct file_operations uverbs_event_fops = { |
| 375 | .owner = THIS_MODULE, |
| 376 | .read = ib_uverbs_event_read, |
| 377 | .poll = ib_uverbs_event_poll, |
| 378 | .release = ib_uverbs_event_close, |
| 379 | .fasync = ib_uverbs_event_fasync |
| 380 | }; |
| 381 | |
| 382 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) |
| 383 | { |
| 384 | struct ib_uverbs_event_file *file = cq_context; |
| 385 | struct ib_ucq_object *uobj; |
| 386 | struct ib_uverbs_event *entry; |
| 387 | unsigned long flags; |
| 388 | |
| 389 | if (!file) |
| 390 | return; |
| 391 | |
| 392 | spin_lock_irqsave(&file->lock, flags); |
| 393 | if (file->is_closed) { |
| 394 | spin_unlock_irqrestore(&file->lock, flags); |
| 395 | return; |
| 396 | } |
| 397 | |
| 398 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
| 399 | if (!entry) { |
| 400 | spin_unlock_irqrestore(&file->lock, flags); |
| 401 | return; |
| 402 | } |
| 403 | |
| 404 | uobj = container_of(cq->uobject, struct ib_ucq_object, uobject); |
| 405 | |
| 406 | entry->desc.comp.cq_handle = cq->uobject->user_handle; |
| 407 | entry->counter = &uobj->comp_events_reported; |
| 408 | |
| 409 | list_add_tail(&entry->list, &file->event_list); |
| 410 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
| 411 | spin_unlock_irqrestore(&file->lock, flags); |
| 412 | |
| 413 | wake_up_interruptible(&file->poll_wait); |
| 414 | kill_fasync(&file->async_queue, SIGIO, POLL_IN); |
| 415 | } |
| 416 | |
| 417 | static void ib_uverbs_async_handler(struct ib_uverbs_file *file, |
| 418 | __u64 element, __u64 event, |
| 419 | struct list_head *obj_list, |
| 420 | u32 *counter) |
| 421 | { |
| 422 | struct ib_uverbs_event *entry; |
| 423 | unsigned long flags; |
| 424 | |
| 425 | spin_lock_irqsave(&file->async_file->lock, flags); |
| 426 | if (!file->async_file->is_closed) { |
| 427 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
| 428 | return; |
| 429 | } |
| 430 | |
| 431 | entry = kmalloc(sizeof *entry, GFP_ATOMIC); |
| 432 | if (!entry) { |
| 433 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
| 434 | return; |
| 435 | } |
| 436 | |
| 437 | entry->desc.async.element = element; |
| 438 | entry->desc.async.event_type = event; |
| 439 | entry->counter = counter; |
| 440 | |
| 441 | list_add_tail(&entry->list, &file->async_file->event_list); |
| 442 | if (obj_list) |
| 443 | list_add_tail(&entry->obj_list, obj_list); |
| 444 | spin_unlock_irqrestore(&file->async_file->lock, flags); |
| 445 | |
| 446 | wake_up_interruptible(&file->async_file->poll_wait); |
| 447 | kill_fasync(&file->async_file->async_queue, SIGIO, POLL_IN); |
| 448 | } |
| 449 | |
| 450 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) |
| 451 | { |
| 452 | struct ib_ucq_object *uobj = container_of(event->element.cq->uobject, |
| 453 | struct ib_ucq_object, uobject); |
| 454 | |
| 455 | ib_uverbs_async_handler(uobj->uverbs_file, uobj->uobject.user_handle, |
| 456 | event->event, &uobj->async_list, |
| 457 | &uobj->async_events_reported); |
| 458 | } |
| 459 | |
| 460 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) |
| 461 | { |
| 462 | struct ib_uevent_object *uobj; |
| 463 | |
| 464 | uobj = container_of(event->element.qp->uobject, |
| 465 | struct ib_uevent_object, uobject); |
| 466 | |
| 467 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, |
| 468 | event->event, &uobj->event_list, |
| 469 | &uobj->events_reported); |
| 470 | } |
| 471 | |
| 472 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
| 473 | { |
| 474 | struct ib_uevent_object *uobj; |
| 475 | |
| 476 | uobj = container_of(event->element.srq->uobject, |
| 477 | struct ib_uevent_object, uobject); |
| 478 | |
| 479 | ib_uverbs_async_handler(context_ptr, uobj->uobject.user_handle, |
| 480 | event->event, &uobj->event_list, |
| 481 | &uobj->events_reported); |
| 482 | } |
| 483 | |
| 484 | void ib_uverbs_event_handler(struct ib_event_handler *handler, |
| 485 | struct ib_event *event) |
| 486 | { |
| 487 | struct ib_uverbs_file *file = |
| 488 | container_of(handler, struct ib_uverbs_file, event_handler); |
| 489 | |
| 490 | ib_uverbs_async_handler(file, event->element.port_num, event->event, |
| 491 | NULL, NULL); |
| 492 | } |
| 493 | |
| 494 | struct file *ib_uverbs_alloc_event_file(struct ib_uverbs_file *uverbs_file, |
| 495 | int is_async, int *fd) |
| 496 | { |
| 497 | struct ib_uverbs_event_file *ev_file; |
| 498 | struct file *filp; |
| 499 | int ret; |
| 500 | |
| 501 | ev_file = kmalloc(sizeof *ev_file, GFP_KERNEL); |
| 502 | if (!ev_file) |
| 503 | return ERR_PTR(-ENOMEM); |
| 504 | |
| 505 | kref_init(&ev_file->ref); |
| 506 | spin_lock_init(&ev_file->lock); |
| 507 | INIT_LIST_HEAD(&ev_file->event_list); |
| 508 | init_waitqueue_head(&ev_file->poll_wait); |
| 509 | ev_file->uverbs_file = uverbs_file; |
| 510 | ev_file->async_queue = NULL; |
| 511 | ev_file->is_async = is_async; |
| 512 | ev_file->is_closed = 0; |
| 513 | |
| 514 | *fd = get_unused_fd(); |
| 515 | if (*fd < 0) { |
| 516 | ret = *fd; |
| 517 | goto err; |
| 518 | } |
| 519 | |
| 520 | /* |
| 521 | * fops_get() can't fail here, because we're coming from a |
| 522 | * system call on a uverbs file, which will already have a |
| 523 | * module reference. |
| 524 | */ |
| 525 | filp = alloc_file(uverbs_event_mnt, dget(uverbs_event_mnt->mnt_root), |
| 526 | FMODE_READ, fops_get(&uverbs_event_fops)); |
| 527 | if (!filp) { |
| 528 | ret = -ENFILE; |
| 529 | goto err_fd; |
| 530 | } |
| 531 | |
| 532 | filp->private_data = ev_file; |
| 533 | |
| 534 | return filp; |
| 535 | |
| 536 | err_fd: |
| 537 | put_unused_fd(*fd); |
| 538 | |
| 539 | err: |
| 540 | kfree(ev_file); |
| 541 | return ERR_PTR(ret); |
| 542 | } |
| 543 | |
| 544 | /* |
| 545 | * Look up a completion event file by FD. If lookup is successful, |
| 546 | * takes a ref to the event file struct that it returns; if |
| 547 | * unsuccessful, returns NULL. |
| 548 | */ |
| 549 | struct ib_uverbs_event_file *ib_uverbs_lookup_comp_file(int fd) |
| 550 | { |
| 551 | struct ib_uverbs_event_file *ev_file = NULL; |
| 552 | struct file *filp; |
| 553 | |
| 554 | filp = fget(fd); |
| 555 | if (!filp) |
| 556 | return NULL; |
| 557 | |
| 558 | if (filp->f_op != &uverbs_event_fops) |
| 559 | goto out; |
| 560 | |
| 561 | ev_file = filp->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 | fput(filp); |
| 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 < 0 || |
| 590 | hdr.command >= ARRAY_SIZE(uverbs_cmd_table) || |
| 591 | !uverbs_cmd_table[hdr.command] || |
| 592 | !(file->device->ib_dev->uverbs_cmd_mask & (1ull << hdr.command))) |
| 593 | return -EINVAL; |
| 594 | |
| 595 | if (!file->ucontext && |
| 596 | hdr.command != IB_USER_VERBS_CMD_GET_CONTEXT) |
| 597 | return -EINVAL; |
| 598 | |
| 599 | return uverbs_cmd_table[hdr.command](file, buf + sizeof hdr, |
| 600 | hdr.in_words * 4, hdr.out_words * 4); |
| 601 | } |
| 602 | |
| 603 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) |
| 604 | { |
| 605 | struct ib_uverbs_file *file = filp->private_data; |
| 606 | |
| 607 | if (!file->ucontext) |
| 608 | return -ENODEV; |
| 609 | else |
| 610 | return file->device->ib_dev->mmap(file->ucontext, vma); |
| 611 | } |
| 612 | |
| 613 | static int ib_uverbs_open(struct inode *inode, struct file *filp) |
| 614 | { |
| 615 | struct ib_uverbs_device *dev; |
| 616 | struct ib_uverbs_file *file; |
| 617 | int ret; |
| 618 | |
| 619 | spin_lock(&map_lock); |
| 620 | dev = dev_table[iminor(inode) - IB_UVERBS_BASE_MINOR]; |
| 621 | if (dev) |
| 622 | kref_get(&dev->ref); |
| 623 | spin_unlock(&map_lock); |
| 624 | |
| 625 | if (!dev) |
| 626 | return -ENXIO; |
| 627 | |
| 628 | if (!try_module_get(dev->ib_dev->owner)) { |
| 629 | ret = -ENODEV; |
| 630 | goto err; |
| 631 | } |
| 632 | |
| 633 | file = kmalloc(sizeof *file, GFP_KERNEL); |
| 634 | if (!file) { |
| 635 | ret = -ENOMEM; |
| 636 | goto err_module; |
| 637 | } |
| 638 | |
| 639 | file->device = dev; |
| 640 | file->ucontext = NULL; |
| 641 | file->async_file = NULL; |
| 642 | kref_init(&file->ref); |
| 643 | mutex_init(&file->mutex); |
| 644 | |
| 645 | filp->private_data = file; |
| 646 | |
| 647 | return 0; |
| 648 | |
| 649 | err_module: |
| 650 | module_put(dev->ib_dev->owner); |
| 651 | |
| 652 | err: |
| 653 | kref_put(&dev->ref, ib_uverbs_release_dev); |
| 654 | |
| 655 | return ret; |
| 656 | } |
| 657 | |
| 658 | static int ib_uverbs_close(struct inode *inode, struct file *filp) |
| 659 | { |
| 660 | struct ib_uverbs_file *file = filp->private_data; |
| 661 | |
| 662 | ib_uverbs_cleanup_ucontext(file, file->ucontext); |
| 663 | |
| 664 | if (file->async_file) |
| 665 | kref_put(&file->async_file->ref, ib_uverbs_release_event_file); |
| 666 | |
| 667 | kref_put(&file->ref, ib_uverbs_release_file); |
| 668 | |
| 669 | return 0; |
| 670 | } |
| 671 | |
| 672 | static const struct file_operations uverbs_fops = { |
| 673 | .owner = THIS_MODULE, |
| 674 | .write = ib_uverbs_write, |
| 675 | .open = ib_uverbs_open, |
| 676 | .release = ib_uverbs_close |
| 677 | }; |
| 678 | |
| 679 | static const struct file_operations uverbs_mmap_fops = { |
| 680 | .owner = THIS_MODULE, |
| 681 | .write = ib_uverbs_write, |
| 682 | .mmap = ib_uverbs_mmap, |
| 683 | .open = ib_uverbs_open, |
| 684 | .release = ib_uverbs_close |
| 685 | }; |
| 686 | |
| 687 | static struct ib_client uverbs_client = { |
| 688 | .name = "uverbs", |
| 689 | .add = ib_uverbs_add_one, |
| 690 | .remove = ib_uverbs_remove_one |
| 691 | }; |
| 692 | |
| 693 | static ssize_t show_ibdev(struct class_device *class_dev, char *buf) |
| 694 | { |
| 695 | struct ib_uverbs_device *dev = class_get_devdata(class_dev); |
| 696 | |
| 697 | if (!dev) |
| 698 | return -ENODEV; |
| 699 | |
| 700 | return sprintf(buf, "%s\n", dev->ib_dev->name); |
| 701 | } |
| 702 | static CLASS_DEVICE_ATTR(ibdev, S_IRUGO, show_ibdev, NULL); |
| 703 | |
| 704 | static ssize_t show_dev_abi_version(struct class_device *class_dev, char *buf) |
| 705 | { |
| 706 | struct ib_uverbs_device *dev = class_get_devdata(class_dev); |
| 707 | |
| 708 | if (!dev) |
| 709 | return -ENODEV; |
| 710 | |
| 711 | return sprintf(buf, "%d\n", dev->ib_dev->uverbs_abi_ver); |
| 712 | } |
| 713 | static CLASS_DEVICE_ATTR(abi_version, S_IRUGO, show_dev_abi_version, NULL); |
| 714 | |
| 715 | static ssize_t show_abi_version(struct class *class, char *buf) |
| 716 | { |
| 717 | return sprintf(buf, "%d\n", IB_USER_VERBS_ABI_VERSION); |
| 718 | } |
| 719 | static CLASS_ATTR(abi_version, S_IRUGO, show_abi_version, NULL); |
| 720 | |
| 721 | static void ib_uverbs_add_one(struct ib_device *device) |
| 722 | { |
| 723 | struct ib_uverbs_device *uverbs_dev; |
| 724 | |
| 725 | if (!device->alloc_ucontext) |
| 726 | return; |
| 727 | |
| 728 | uverbs_dev = kzalloc(sizeof *uverbs_dev, GFP_KERNEL); |
| 729 | if (!uverbs_dev) |
| 730 | return; |
| 731 | |
| 732 | kref_init(&uverbs_dev->ref); |
| 733 | init_completion(&uverbs_dev->comp); |
| 734 | |
| 735 | spin_lock(&map_lock); |
| 736 | uverbs_dev->devnum = find_first_zero_bit(dev_map, IB_UVERBS_MAX_DEVICES); |
| 737 | if (uverbs_dev->devnum >= IB_UVERBS_MAX_DEVICES) { |
| 738 | spin_unlock(&map_lock); |
| 739 | goto err; |
| 740 | } |
| 741 | set_bit(uverbs_dev->devnum, dev_map); |
| 742 | spin_unlock(&map_lock); |
| 743 | |
| 744 | uverbs_dev->ib_dev = device; |
| 745 | uverbs_dev->num_comp_vectors = device->num_comp_vectors; |
| 746 | |
| 747 | uverbs_dev->dev = cdev_alloc(); |
| 748 | if (!uverbs_dev->dev) |
| 749 | goto err; |
| 750 | uverbs_dev->dev->owner = THIS_MODULE; |
| 751 | uverbs_dev->dev->ops = device->mmap ? &uverbs_mmap_fops : &uverbs_fops; |
| 752 | kobject_set_name(&uverbs_dev->dev->kobj, "uverbs%d", uverbs_dev->devnum); |
| 753 | if (cdev_add(uverbs_dev->dev, IB_UVERBS_BASE_DEV + uverbs_dev->devnum, 1)) |
| 754 | goto err_cdev; |
| 755 | |
| 756 | uverbs_dev->class_dev = class_device_create(uverbs_class, NULL, |
| 757 | uverbs_dev->dev->dev, |
| 758 | device->dma_device, |
| 759 | "uverbs%d", uverbs_dev->devnum); |
| 760 | if (IS_ERR(uverbs_dev->class_dev)) |
| 761 | goto err_cdev; |
| 762 | |
| 763 | class_set_devdata(uverbs_dev->class_dev, uverbs_dev); |
| 764 | |
| 765 | if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_ibdev)) |
| 766 | goto err_class; |
| 767 | if (class_device_create_file(uverbs_dev->class_dev, &class_device_attr_abi_version)) |
| 768 | goto err_class; |
| 769 | |
| 770 | spin_lock(&map_lock); |
| 771 | dev_table[uverbs_dev->devnum] = uverbs_dev; |
| 772 | spin_unlock(&map_lock); |
| 773 | |
| 774 | ib_set_client_data(device, &uverbs_client, uverbs_dev); |
| 775 | |
| 776 | return; |
| 777 | |
| 778 | err_class: |
| 779 | class_device_destroy(uverbs_class, uverbs_dev->dev->dev); |
| 780 | |
| 781 | err_cdev: |
| 782 | cdev_del(uverbs_dev->dev); |
| 783 | clear_bit(uverbs_dev->devnum, dev_map); |
| 784 | |
| 785 | err: |
| 786 | kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); |
| 787 | wait_for_completion(&uverbs_dev->comp); |
| 788 | kfree(uverbs_dev); |
| 789 | return; |
| 790 | } |
| 791 | |
| 792 | static void ib_uverbs_remove_one(struct ib_device *device) |
| 793 | { |
| 794 | struct ib_uverbs_device *uverbs_dev = ib_get_client_data(device, &uverbs_client); |
| 795 | |
| 796 | if (!uverbs_dev) |
| 797 | return; |
| 798 | |
| 799 | class_set_devdata(uverbs_dev->class_dev, NULL); |
| 800 | class_device_destroy(uverbs_class, uverbs_dev->dev->dev); |
| 801 | cdev_del(uverbs_dev->dev); |
| 802 | |
| 803 | spin_lock(&map_lock); |
| 804 | dev_table[uverbs_dev->devnum] = NULL; |
| 805 | spin_unlock(&map_lock); |
| 806 | |
| 807 | clear_bit(uverbs_dev->devnum, dev_map); |
| 808 | |
| 809 | kref_put(&uverbs_dev->ref, ib_uverbs_release_dev); |
| 810 | wait_for_completion(&uverbs_dev->comp); |
| 811 | kfree(uverbs_dev); |
| 812 | } |
| 813 | |
| 814 | static int uverbs_event_get_sb(struct file_system_type *fs_type, int flags, |
| 815 | const char *dev_name, void *data, |
| 816 | struct vfsmount *mnt) |
| 817 | { |
| 818 | return get_sb_pseudo(fs_type, "infinibandevent:", NULL, |
| 819 | INFINIBANDEVENTFS_MAGIC, mnt); |
| 820 | } |
| 821 | |
| 822 | static struct file_system_type uverbs_event_fs = { |
| 823 | /* No owner field so module can be unloaded */ |
| 824 | .name = "infinibandeventfs", |
| 825 | .get_sb = uverbs_event_get_sb, |
| 826 | .kill_sb = kill_litter_super |
| 827 | }; |
| 828 | |
| 829 | static int __init ib_uverbs_init(void) |
| 830 | { |
| 831 | int ret; |
| 832 | |
| 833 | spin_lock_init(&map_lock); |
| 834 | |
| 835 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES, |
| 836 | "infiniband_verbs"); |
| 837 | if (ret) { |
| 838 | printk(KERN_ERR "user_verbs: couldn't register device number\n"); |
| 839 | goto out; |
| 840 | } |
| 841 | |
| 842 | uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); |
| 843 | if (IS_ERR(uverbs_class)) { |
| 844 | ret = PTR_ERR(uverbs_class); |
| 845 | printk(KERN_ERR "user_verbs: couldn't create class infiniband_verbs\n"); |
| 846 | goto out_chrdev; |
| 847 | } |
| 848 | |
| 849 | ret = class_create_file(uverbs_class, &class_attr_abi_version); |
| 850 | if (ret) { |
| 851 | printk(KERN_ERR "user_verbs: couldn't create abi_version attribute\n"); |
| 852 | goto out_class; |
| 853 | } |
| 854 | |
| 855 | ret = register_filesystem(&uverbs_event_fs); |
| 856 | if (ret) { |
| 857 | printk(KERN_ERR "user_verbs: couldn't register infinibandeventfs\n"); |
| 858 | goto out_class; |
| 859 | } |
| 860 | |
| 861 | uverbs_event_mnt = kern_mount(&uverbs_event_fs); |
| 862 | if (IS_ERR(uverbs_event_mnt)) { |
| 863 | ret = PTR_ERR(uverbs_event_mnt); |
| 864 | printk(KERN_ERR "user_verbs: couldn't mount infinibandeventfs\n"); |
| 865 | goto out_fs; |
| 866 | } |
| 867 | |
| 868 | ret = ib_register_client(&uverbs_client); |
| 869 | if (ret) { |
| 870 | printk(KERN_ERR "user_verbs: couldn't register client\n"); |
| 871 | goto out_mnt; |
| 872 | } |
| 873 | |
| 874 | return 0; |
| 875 | |
| 876 | out_mnt: |
| 877 | mntput(uverbs_event_mnt); |
| 878 | |
| 879 | out_fs: |
| 880 | unregister_filesystem(&uverbs_event_fs); |
| 881 | |
| 882 | out_class: |
| 883 | class_destroy(uverbs_class); |
| 884 | |
| 885 | out_chrdev: |
| 886 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); |
| 887 | |
| 888 | out: |
| 889 | return ret; |
| 890 | } |
| 891 | |
| 892 | static void __exit ib_uverbs_cleanup(void) |
| 893 | { |
| 894 | ib_unregister_client(&uverbs_client); |
| 895 | mntput(uverbs_event_mnt); |
| 896 | unregister_filesystem(&uverbs_event_fs); |
| 897 | class_destroy(uverbs_class); |
| 898 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, IB_UVERBS_MAX_DEVICES); |
| 899 | idr_destroy(&ib_uverbs_pd_idr); |
| 900 | idr_destroy(&ib_uverbs_mr_idr); |
| 901 | idr_destroy(&ib_uverbs_mw_idr); |
| 902 | idr_destroy(&ib_uverbs_ah_idr); |
| 903 | idr_destroy(&ib_uverbs_cq_idr); |
| 904 | idr_destroy(&ib_uverbs_qp_idr); |
| 905 | idr_destroy(&ib_uverbs_srq_idr); |
| 906 | } |
| 907 | |
| 908 | module_init(ib_uverbs_init); |
| 909 | module_exit(ib_uverbs_cleanup); |