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