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bc38a6ab RD |
1 | /* |
2 | * Copyright (c) 2005 Topspin Communications. All rights reserved. | |
33b9b3ee | 3 | * Copyright (c) 2005, 2006 Cisco Systems. All rights reserved. |
2a1d9b7f RD |
4 | * Copyright (c) 2005 Mellanox Technologies. All rights reserved. |
5 | * Copyright (c) 2005 Voltaire, Inc. All rights reserved. | |
67cdb40c | 6 | * Copyright (c) 2005 PathScale, Inc. All rights reserved. |
bc38a6ab RD |
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. | |
bc38a6ab RD |
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> | |
a99bbaf5 | 43 | #include <linux/sched.h> |
bc38a6ab | 44 | #include <linux/file.h> |
70a30e16 | 45 | #include <linux/cdev.h> |
a265e558 | 46 | #include <linux/anon_inodes.h> |
5a0e3ad6 | 47 | #include <linux/slab.h> |
5f9794dc | 48 | #include <linux/sched/mm.h> |
bc38a6ab | 49 | |
7c0f6ba6 | 50 | #include <linux/uaccess.h> |
bc38a6ab | 51 | |
e6bd18f5 | 52 | #include <rdma/ib.h> |
52427112 | 53 | #include <rdma/uverbs_std_types.h> |
8f71bb00 | 54 | #include <rdma/rdma_netlink.h> |
e6bd18f5 | 55 | |
bc38a6ab | 56 | #include "uverbs.h" |
43579b5f | 57 | #include "core_priv.h" |
fd3c7904 | 58 | #include "rdma_core.h" |
bc38a6ab RD |
59 | |
60 | MODULE_AUTHOR("Roland Dreier"); | |
61 | MODULE_DESCRIPTION("InfiniBand userspace verbs access"); | |
62 | MODULE_LICENSE("Dual BSD/GPL"); | |
63 | ||
bc38a6ab RD |
64 | enum { |
65 | IB_UVERBS_MAJOR = 231, | |
66 | IB_UVERBS_BASE_MINOR = 192, | |
8cf12d77 HN |
67 | IB_UVERBS_MAX_DEVICES = RDMA_MAX_PORTS, |
68 | IB_UVERBS_NUM_FIXED_MINOR = 32, | |
69 | IB_UVERBS_NUM_DYNAMIC_MINOR = IB_UVERBS_MAX_DEVICES - IB_UVERBS_NUM_FIXED_MINOR, | |
bc38a6ab RD |
70 | }; |
71 | ||
72 | #define IB_UVERBS_BASE_DEV MKDEV(IB_UVERBS_MAJOR, IB_UVERBS_BASE_MINOR) | |
73 | ||
8cf12d77 | 74 | static dev_t dynamic_uverbs_dev; |
70a30e16 RD |
75 | static struct class *uverbs_class; |
76 | ||
90f6e41c | 77 | static DEFINE_IDA(uverbs_ida); |
bc38a6ab | 78 | static void ib_uverbs_add_one(struct ib_device *device); |
7c1eb45a | 79 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data); |
bc38a6ab | 80 | |
22fa27fb JG |
81 | /* |
82 | * Must be called with the ufile->device->disassociate_srcu held, and the lock | |
83 | * must be held until use of the ucontext is finished. | |
84 | */ | |
8313c10f | 85 | struct ib_ucontext *ib_uverbs_get_ucontext_file(struct ib_uverbs_file *ufile) |
7dc08dcf | 86 | { |
22fa27fb JG |
87 | /* |
88 | * We do not hold the hw_destroy_rwsem lock for this flow, instead | |
89 | * srcu is used. It does not matter if someone races this with | |
90 | * get_context, we get NULL or valid ucontext. | |
91 | */ | |
92 | struct ib_ucontext *ucontext = smp_load_acquire(&ufile->ucontext); | |
93 | ||
94 | if (!srcu_dereference(ufile->device->ib_dev, | |
95 | &ufile->device->disassociate_srcu)) | |
96 | return ERR_PTR(-EIO); | |
97 | ||
98 | if (!ucontext) | |
99 | return ERR_PTR(-EINVAL); | |
100 | ||
101 | return ucontext; | |
7dc08dcf | 102 | } |
8313c10f | 103 | EXPORT_SYMBOL(ib_uverbs_get_ucontext_file); |
7dc08dcf | 104 | |
feb7c1e3 CH |
105 | int uverbs_dealloc_mw(struct ib_mw *mw) |
106 | { | |
107 | struct ib_pd *pd = mw->pd; | |
108 | int ret; | |
109 | ||
3023a1e9 | 110 | ret = mw->device->ops.dealloc_mw(mw); |
feb7c1e3 CH |
111 | if (!ret) |
112 | atomic_dec(&pd->usecnt); | |
113 | return ret; | |
114 | } | |
115 | ||
c5c4d92e | 116 | static void ib_uverbs_release_dev(struct device *device) |
70a30e16 RD |
117 | { |
118 | struct ib_uverbs_device *dev = | |
c5c4d92e | 119 | container_of(device, struct ib_uverbs_device, dev); |
70a30e16 | 120 | |
9ed3e5f4 | 121 | uverbs_destroy_api(dev->uapi); |
036b1063 | 122 | cleanup_srcu_struct(&dev->disassociate_srcu); |
56594ae1 PP |
123 | mutex_destroy(&dev->lists_mutex); |
124 | mutex_destroy(&dev->xrcd_tree_mutex); | |
35d4a0b6 | 125 | kfree(dev); |
70a30e16 RD |
126 | } |
127 | ||
5c55cfd6 JG |
128 | void ib_uverbs_release_ucq(struct ib_uverbs_completion_event_file *ev_file, |
129 | struct ib_ucq_object *uobj) | |
70a30e16 RD |
130 | { |
131 | struct ib_uverbs_event *evt, *tmp; | |
132 | ||
133 | if (ev_file) { | |
db1b5ddd | 134 | spin_lock_irq(&ev_file->ev_queue.lock); |
70a30e16 RD |
135 | list_for_each_entry_safe(evt, tmp, &uobj->comp_list, obj_list) { |
136 | list_del(&evt->list); | |
137 | kfree(evt); | |
138 | } | |
db1b5ddd | 139 | spin_unlock_irq(&ev_file->ev_queue.lock); |
70a30e16 | 140 | |
d0259e82 | 141 | uverbs_uobject_put(&ev_file->uobj); |
70a30e16 RD |
142 | } |
143 | ||
5c55cfd6 | 144 | ib_uverbs_release_uevent(&uobj->uevent); |
70a30e16 RD |
145 | } |
146 | ||
5c55cfd6 | 147 | void ib_uverbs_release_uevent(struct ib_uevent_object *uobj) |
70a30e16 | 148 | { |
5c55cfd6 JG |
149 | struct ib_uverbs_async_event_file *async_file = |
150 | READ_ONCE(uobj->uobject.ufile->async_file); | |
70a30e16 RD |
151 | struct ib_uverbs_event *evt, *tmp; |
152 | ||
a1123418 JG |
153 | if (!async_file) |
154 | return; | |
155 | ||
5c55cfd6 | 156 | spin_lock_irq(&async_file->ev_queue.lock); |
70a30e16 RD |
157 | list_for_each_entry_safe(evt, tmp, &uobj->event_list, obj_list) { |
158 | list_del(&evt->list); | |
159 | kfree(evt); | |
160 | } | |
5c55cfd6 | 161 | spin_unlock_irq(&async_file->ev_queue.lock); |
70a30e16 RD |
162 | } |
163 | ||
6be60aed MB |
164 | void ib_uverbs_detach_umcast(struct ib_qp *qp, |
165 | struct ib_uqp_object *uobj) | |
f4e40156 JM |
166 | { |
167 | struct ib_uverbs_mcast_entry *mcast, *tmp; | |
168 | ||
169 | list_for_each_entry_safe(mcast, tmp, &uobj->mcast_list, list) { | |
170 | ib_detach_mcast(qp, &mcast->gid, mcast->lid); | |
171 | list_del(&mcast->list); | |
172 | kfree(mcast); | |
173 | } | |
174 | } | |
175 | ||
35d4a0b6 YH |
176 | static void ib_uverbs_comp_dev(struct ib_uverbs_device *dev) |
177 | { | |
178 | complete(&dev->comp); | |
179 | } | |
180 | ||
cf8966b3 | 181 | void ib_uverbs_release_file(struct kref *ref) |
bc38a6ab RD |
182 | { |
183 | struct ib_uverbs_file *file = | |
184 | container_of(ref, struct ib_uverbs_file, ref); | |
036b1063 YH |
185 | struct ib_device *ib_dev; |
186 | int srcu_key; | |
187 | ||
0f50d88a JG |
188 | release_ufile_idr_uobject(file); |
189 | ||
036b1063 YH |
190 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
191 | ib_dev = srcu_dereference(file->device->ib_dev, | |
192 | &file->device->disassociate_srcu); | |
3023a1e9 | 193 | if (ib_dev && !ib_dev->ops.disassociate_ucontext) |
7a154142 | 194 | module_put(ib_dev->ops.owner); |
036b1063 | 195 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); |
bc38a6ab | 196 | |
35d4a0b6 YH |
197 | if (atomic_dec_and_test(&file->device->refcount)) |
198 | ib_uverbs_comp_dev(file->device); | |
70a30e16 | 199 | |
425784aa | 200 | if (file->async_file) |
3e032c0e | 201 | uverbs_uobject_put(&file->async_file->uobj); |
c5c4d92e | 202 | put_device(&file->device->dev); |
67f269b3 JG |
203 | |
204 | if (file->disassociate_page) | |
205 | __free_pages(file->disassociate_page, 0); | |
56594ae1 PP |
206 | mutex_destroy(&file->umap_lock); |
207 | mutex_destroy(&file->ucontext_lock); | |
bc38a6ab RD |
208 | kfree(file); |
209 | } | |
210 | ||
db1b5ddd | 211 | static ssize_t ib_uverbs_event_read(struct ib_uverbs_event_queue *ev_queue, |
1e7710f3 MB |
212 | struct file *filp, char __user *buf, |
213 | size_t count, loff_t *pos, | |
e0fcc611 | 214 | size_t eventsz) |
bc38a6ab | 215 | { |
63aaf647 | 216 | struct ib_uverbs_event *event; |
bc38a6ab RD |
217 | int ret = 0; |
218 | ||
db1b5ddd | 219 | spin_lock_irq(&ev_queue->lock); |
bc38a6ab | 220 | |
db1b5ddd MB |
221 | while (list_empty(&ev_queue->event_list)) { |
222 | spin_unlock_irq(&ev_queue->lock); | |
bc38a6ab RD |
223 | |
224 | if (filp->f_flags & O_NONBLOCK) | |
225 | return -EAGAIN; | |
226 | ||
db1b5ddd MB |
227 | if (wait_event_interruptible(ev_queue->poll_wait, |
228 | (!list_empty(&ev_queue->event_list) || | |
14e23bd6 | 229 | ev_queue->is_closed))) |
bc38a6ab RD |
230 | return -ERESTARTSYS; |
231 | ||
14e23bd6 JG |
232 | spin_lock_irq(&ev_queue->lock); |
233 | ||
036b1063 | 234 | /* If device was disassociated and no event exists set an error */ |
14e23bd6 JG |
235 | if (list_empty(&ev_queue->event_list) && ev_queue->is_closed) { |
236 | spin_unlock_irq(&ev_queue->lock); | |
036b1063 | 237 | return -EIO; |
14e23bd6 | 238 | } |
bc38a6ab RD |
239 | } |
240 | ||
db1b5ddd | 241 | event = list_entry(ev_queue->event_list.next, struct ib_uverbs_event, list); |
63aaf647 | 242 | |
bc38a6ab RD |
243 | if (eventsz > count) { |
244 | ret = -EINVAL; | |
245 | event = NULL; | |
63aaf647 | 246 | } else { |
db1b5ddd | 247 | list_del(ev_queue->event_list.next); |
63aaf647 RD |
248 | if (event->counter) { |
249 | ++(*event->counter); | |
250 | list_del(&event->obj_list); | |
251 | } | |
252 | } | |
bc38a6ab | 253 | |
db1b5ddd | 254 | spin_unlock_irq(&ev_queue->lock); |
bc38a6ab RD |
255 | |
256 | if (event) { | |
257 | if (copy_to_user(buf, event, eventsz)) | |
258 | ret = -EFAULT; | |
259 | else | |
260 | ret = eventsz; | |
261 | } | |
262 | ||
263 | kfree(event); | |
264 | ||
265 | return ret; | |
266 | } | |
267 | ||
1e7710f3 MB |
268 | static ssize_t ib_uverbs_async_event_read(struct file *filp, char __user *buf, |
269 | size_t count, loff_t *pos) | |
270 | { | |
271 | struct ib_uverbs_async_event_file *file = filp->private_data; | |
272 | ||
14e23bd6 | 273 | return ib_uverbs_event_read(&file->ev_queue, filp, buf, count, pos, |
e0fcc611 | 274 | sizeof(struct ib_uverbs_async_event_desc)); |
1e7710f3 MB |
275 | } |
276 | ||
277 | static ssize_t ib_uverbs_comp_event_read(struct file *filp, char __user *buf, | |
278 | size_t count, loff_t *pos) | |
279 | { | |
280 | struct ib_uverbs_completion_event_file *comp_ev_file = | |
281 | filp->private_data; | |
282 | ||
14e23bd6 JG |
283 | return ib_uverbs_event_read(&comp_ev_file->ev_queue, filp, buf, count, |
284 | pos, | |
e0fcc611 | 285 | sizeof(struct ib_uverbs_comp_event_desc)); |
1e7710f3 MB |
286 | } |
287 | ||
afc9a42b | 288 | static __poll_t ib_uverbs_event_poll(struct ib_uverbs_event_queue *ev_queue, |
1e7710f3 | 289 | struct file *filp, |
bc38a6ab RD |
290 | struct poll_table_struct *wait) |
291 | { | |
afc9a42b | 292 | __poll_t pollflags = 0; |
bc38a6ab | 293 | |
db1b5ddd | 294 | poll_wait(filp, &ev_queue->poll_wait, wait); |
bc38a6ab | 295 | |
db1b5ddd MB |
296 | spin_lock_irq(&ev_queue->lock); |
297 | if (!list_empty(&ev_queue->event_list)) | |
a9a08845 | 298 | pollflags = EPOLLIN | EPOLLRDNORM; |
db1b5ddd | 299 | spin_unlock_irq(&ev_queue->lock); |
bc38a6ab RD |
300 | |
301 | return pollflags; | |
302 | } | |
303 | ||
afc9a42b | 304 | static __poll_t ib_uverbs_async_event_poll(struct file *filp, |
1e7710f3 MB |
305 | struct poll_table_struct *wait) |
306 | { | |
14e23bd6 JG |
307 | struct ib_uverbs_async_event_file *file = filp->private_data; |
308 | ||
309 | return ib_uverbs_event_poll(&file->ev_queue, filp, wait); | |
1e7710f3 MB |
310 | } |
311 | ||
afc9a42b | 312 | static __poll_t ib_uverbs_comp_event_poll(struct file *filp, |
1e7710f3 MB |
313 | struct poll_table_struct *wait) |
314 | { | |
315 | struct ib_uverbs_completion_event_file *comp_ev_file = | |
316 | filp->private_data; | |
317 | ||
db1b5ddd | 318 | return ib_uverbs_event_poll(&comp_ev_file->ev_queue, filp, wait); |
1e7710f3 MB |
319 | } |
320 | ||
321 | static int ib_uverbs_async_event_fasync(int fd, struct file *filp, int on) | |
abdf119b | 322 | { |
14e23bd6 | 323 | struct ib_uverbs_async_event_file *file = filp->private_data; |
abdf119b | 324 | |
14e23bd6 | 325 | return fasync_helper(fd, filp, on, &file->ev_queue.async_queue); |
abdf119b GN |
326 | } |
327 | ||
1e7710f3 | 328 | static int ib_uverbs_comp_event_fasync(int fd, struct file *filp, int on) |
bc38a6ab | 329 | { |
1e7710f3 MB |
330 | struct ib_uverbs_completion_event_file *comp_ev_file = |
331 | filp->private_data; | |
332 | ||
db1b5ddd | 333 | return fasync_helper(fd, filp, on, &comp_ev_file->ev_queue.async_queue); |
1e7710f3 MB |
334 | } |
335 | ||
1e7710f3 | 336 | const struct file_operations uverbs_event_fops = { |
6b73597e | 337 | .owner = THIS_MODULE, |
1e7710f3 MB |
338 | .read = ib_uverbs_comp_event_read, |
339 | .poll = ib_uverbs_comp_event_poll, | |
f7c8416c | 340 | .release = uverbs_uobject_fd_release, |
1e7710f3 MB |
341 | .fasync = ib_uverbs_comp_event_fasync, |
342 | .llseek = no_llseek, | |
343 | }; | |
344 | ||
3e032c0e | 345 | const struct file_operations uverbs_async_event_fops = { |
1e7710f3 MB |
346 | .owner = THIS_MODULE, |
347 | .read = ib_uverbs_async_event_read, | |
348 | .poll = ib_uverbs_async_event_poll, | |
c485b19d | 349 | .release = uverbs_async_event_release, |
1e7710f3 | 350 | .fasync = ib_uverbs_async_event_fasync, |
bc1db9af | 351 | .llseek = no_llseek, |
bc38a6ab RD |
352 | }; |
353 | ||
354 | void ib_uverbs_comp_handler(struct ib_cq *cq, void *cq_context) | |
355 | { | |
db1b5ddd | 356 | struct ib_uverbs_event_queue *ev_queue = cq_context; |
6b73597e RD |
357 | struct ib_ucq_object *uobj; |
358 | struct ib_uverbs_event *entry; | |
359 | unsigned long flags; | |
360 | ||
db1b5ddd | 361 | if (!ev_queue) |
6b73597e RD |
362 | return; |
363 | ||
db1b5ddd MB |
364 | spin_lock_irqsave(&ev_queue->lock, flags); |
365 | if (ev_queue->is_closed) { | |
366 | spin_unlock_irqrestore(&ev_queue->lock, flags); | |
6b73597e RD |
367 | return; |
368 | } | |
bc38a6ab | 369 | |
08f0e161 | 370 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
305a7e87 | 371 | if (!entry) { |
db1b5ddd | 372 | spin_unlock_irqrestore(&ev_queue->lock, flags); |
bc38a6ab | 373 | return; |
305a7e87 | 374 | } |
bc38a6ab | 375 | |
5bd48c18 | 376 | uobj = cq->uobject; |
63aaf647 | 377 | |
5bd48c18 | 378 | entry->desc.comp.cq_handle = cq->uobject->uevent.uobject.user_handle; |
63aaf647 | 379 | entry->counter = &uobj->comp_events_reported; |
bc38a6ab | 380 | |
db1b5ddd | 381 | list_add_tail(&entry->list, &ev_queue->event_list); |
63aaf647 | 382 | list_add_tail(&entry->obj_list, &uobj->comp_list); |
db1b5ddd | 383 | spin_unlock_irqrestore(&ev_queue->lock, flags); |
bc38a6ab | 384 | |
db1b5ddd MB |
385 | wake_up_interruptible(&ev_queue->poll_wait); |
386 | kill_fasync(&ev_queue->async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
387 | } |
388 | ||
ccfdbaa5 JG |
389 | void ib_uverbs_async_handler(struct ib_uverbs_async_event_file *async_file, |
390 | __u64 element, __u64 event, | |
391 | struct list_head *obj_list, u32 *counter) | |
bc38a6ab | 392 | { |
63aaf647 | 393 | struct ib_uverbs_event *entry; |
bc38a6ab RD |
394 | unsigned long flags; |
395 | ||
a1123418 JG |
396 | if (!async_file) |
397 | return; | |
398 | ||
817d6576 JG |
399 | spin_lock_irqsave(&async_file->ev_queue.lock, flags); |
400 | if (async_file->ev_queue.is_closed) { | |
401 | spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); | |
6b73597e RD |
402 | return; |
403 | } | |
404 | ||
08f0e161 | 405 | entry = kmalloc(sizeof(*entry), GFP_ATOMIC); |
305a7e87 | 406 | if (!entry) { |
817d6576 | 407 | spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); |
bc38a6ab | 408 | return; |
305a7e87 | 409 | } |
bc38a6ab | 410 | |
817d6576 | 411 | entry->desc.async.element = element; |
63aaf647 | 412 | entry->desc.async.event_type = event; |
817d6576 JG |
413 | entry->desc.async.reserved = 0; |
414 | entry->counter = counter; | |
bc38a6ab | 415 | |
817d6576 | 416 | list_add_tail(&entry->list, &async_file->ev_queue.event_list); |
63aaf647 RD |
417 | if (obj_list) |
418 | list_add_tail(&entry->obj_list, obj_list); | |
817d6576 | 419 | spin_unlock_irqrestore(&async_file->ev_queue.lock, flags); |
bc38a6ab | 420 | |
817d6576 JG |
421 | wake_up_interruptible(&async_file->ev_queue.poll_wait); |
422 | kill_fasync(&async_file->ev_queue.async_queue, SIGIO, POLL_IN); | |
bc38a6ab RD |
423 | } |
424 | ||
817d6576 JG |
425 | static void uverbs_uobj_event(struct ib_uevent_object *eobj, |
426 | struct ib_event *event) | |
bc38a6ab | 427 | { |
5c55cfd6 | 428 | ib_uverbs_async_handler(READ_ONCE(eobj->uobject.ufile->async_file), |
817d6576 JG |
429 | eobj->uobject.user_handle, event->event, |
430 | &eobj->event_list, &eobj->events_reported); | |
431 | } | |
63aaf647 | 432 | |
817d6576 JG |
433 | void ib_uverbs_cq_event_handler(struct ib_event *event, void *context_ptr) |
434 | { | |
435 | uverbs_uobj_event(&event->element.cq->uobject->uevent, event); | |
bc38a6ab RD |
436 | } |
437 | ||
438 | void ib_uverbs_qp_event_handler(struct ib_event *event, void *context_ptr) | |
439 | { | |
a040f95d | 440 | /* for XRC target qp's, check that qp is live */ |
fd3c7904 | 441 | if (!event->element.qp->uobject) |
a040f95d JM |
442 | return; |
443 | ||
817d6576 | 444 | uverbs_uobj_event(&event->element.qp->uobject->uevent, event); |
bc38a6ab RD |
445 | } |
446 | ||
f213c052 YH |
447 | void ib_uverbs_wq_event_handler(struct ib_event *event, void *context_ptr) |
448 | { | |
817d6576 | 449 | uverbs_uobj_event(&event->element.wq->uobject->uevent, event); |
f213c052 YH |
450 | } |
451 | ||
f520ba5a RD |
452 | void ib_uverbs_srq_event_handler(struct ib_event *event, void *context_ptr) |
453 | { | |
817d6576 | 454 | uverbs_uobj_event(&event->element.srq->uobject->uevent, event); |
f520ba5a RD |
455 | } |
456 | ||
817d6576 JG |
457 | static void ib_uverbs_event_handler(struct ib_event_handler *handler, |
458 | struct ib_event *event) | |
bc38a6ab | 459 | { |
817d6576 | 460 | ib_uverbs_async_handler( |
3e032c0e JG |
461 | container_of(handler, struct ib_uverbs_async_event_file, |
462 | event_handler), | |
817d6576 | 463 | event->element.port_num, event->event, NULL, NULL); |
bc38a6ab RD |
464 | } |
465 | ||
db1b5ddd | 466 | void ib_uverbs_init_event_queue(struct ib_uverbs_event_queue *ev_queue) |
bc38a6ab | 467 | { |
db1b5ddd MB |
468 | spin_lock_init(&ev_queue->lock); |
469 | INIT_LIST_HEAD(&ev_queue->event_list); | |
470 | init_waitqueue_head(&ev_queue->poll_wait); | |
471 | ev_queue->is_closed = 0; | |
472 | ev_queue->async_queue = NULL; | |
1e7710f3 MB |
473 | } |
474 | ||
3e032c0e JG |
475 | void ib_uverbs_init_async_event_file( |
476 | struct ib_uverbs_async_event_file *async_file) | |
1e7710f3 | 477 | { |
3e032c0e JG |
478 | struct ib_uverbs_file *uverbs_file = async_file->uobj.ufile; |
479 | struct ib_device *ib_dev = async_file->uobj.context->device; | |
03c40442 | 480 | |
3e032c0e | 481 | ib_uverbs_init_event_queue(&async_file->ev_queue); |
03c40442 | 482 | |
d680e88e | 483 | /* The first async_event_file becomes the default one for the file. */ |
a1123418 | 484 | mutex_lock(&uverbs_file->ucontext_lock); |
d680e88e | 485 | if (!uverbs_file->async_file) { |
3e032c0e JG |
486 | /* Pairs with the put in ib_uverbs_release_file */ |
487 | uverbs_uobject_get(&async_file->uobj); | |
5c55cfd6 | 488 | smp_store_release(&uverbs_file->async_file, async_file); |
3e032c0e | 489 | } |
a1123418 | 490 | mutex_unlock(&uverbs_file->ucontext_lock); |
3e032c0e JG |
491 | |
492 | INIT_IB_EVENT_HANDLER(&async_file->event_handler, ib_dev, | |
493 | ib_uverbs_event_handler); | |
494 | ib_register_event_handler(&async_file->event_handler); | |
6b73597e RD |
495 | } |
496 | ||
6284380a | 497 | static ssize_t verify_hdr(struct ib_uverbs_cmd_hdr *hdr, |
da0f60df JG |
498 | struct ib_uverbs_ex_cmd_hdr *ex_hdr, size_t count, |
499 | const struct uverbs_api_write_method *method_elm) | |
6284380a | 500 | { |
da0f60df | 501 | if (method_elm->is_ex) { |
6284380a LR |
502 | count -= sizeof(*hdr) + sizeof(*ex_hdr); |
503 | ||
504 | if ((hdr->in_words + ex_hdr->provider_in_words) * 8 != count) | |
505 | return -EINVAL; | |
506 | ||
da0f60df JG |
507 | if (hdr->in_words * 8 < method_elm->req_size) |
508 | return -ENOSPC; | |
509 | ||
6284380a LR |
510 | if (ex_hdr->cmd_hdr_reserved) |
511 | return -EINVAL; | |
512 | ||
513 | if (ex_hdr->response) { | |
514 | if (!hdr->out_words && !ex_hdr->provider_out_words) | |
515 | return -EINVAL; | |
516 | ||
da0f60df JG |
517 | if (hdr->out_words * 8 < method_elm->resp_size) |
518 | return -ENOSPC; | |
519 | ||
96d4f267 | 520 | if (!access_ok(u64_to_user_ptr(ex_hdr->response), |
6284380a LR |
521 | (hdr->out_words + ex_hdr->provider_out_words) * 8)) |
522 | return -EFAULT; | |
523 | } else { | |
524 | if (hdr->out_words || ex_hdr->provider_out_words) | |
525 | return -EINVAL; | |
526 | } | |
527 | ||
528 | return 0; | |
529 | } | |
530 | ||
531 | /* not extended command */ | |
532 | if (hdr->in_words * 4 != count) | |
533 | return -EINVAL; | |
534 | ||
da0f60df JG |
535 | if (count < method_elm->req_size + sizeof(hdr)) { |
536 | /* | |
537 | * rdma-core v18 and v19 have a bug where they send DESTROY_CQ | |
538 | * with a 16 byte write instead of 24. Old kernels didn't | |
539 | * check the size so they allowed this. Now that the size is | |
540 | * checked provide a compatibility work around to not break | |
541 | * those userspaces. | |
542 | */ | |
543 | if (hdr->command == IB_USER_VERBS_CMD_DESTROY_CQ && | |
544 | count == 16) { | |
545 | hdr->in_words = 6; | |
546 | return 0; | |
547 | } | |
548 | return -ENOSPC; | |
549 | } | |
550 | if (hdr->out_words * 4 < method_elm->resp_size) | |
551 | return -ENOSPC; | |
552 | ||
6284380a LR |
553 | return 0; |
554 | } | |
555 | ||
bc38a6ab RD |
556 | static ssize_t ib_uverbs_write(struct file *filp, const char __user *buf, |
557 | size_t count, loff_t *pos) | |
558 | { | |
559 | struct ib_uverbs_file *file = filp->private_data; | |
d120c3c9 JG |
560 | const struct uverbs_api_write_method *method_elm; |
561 | struct uverbs_api *uapi = file->device->uapi; | |
43ae9513 | 562 | struct ib_uverbs_ex_cmd_hdr ex_hdr; |
bc38a6ab | 563 | struct ib_uverbs_cmd_hdr hdr; |
8313c10f | 564 | struct uverbs_attr_bundle bundle; |
036b1063 YH |
565 | int srcu_key; |
566 | ssize_t ret; | |
057aec0d | 567 | |
f73a1dbc LR |
568 | if (!ib_safe_file_access(filp)) { |
569 | pr_err_once("uverbs_write: process %d (%s) changed security contexts after opening file descriptor, this is not allowed.\n", | |
570 | task_tgid_vnr(current), current->comm); | |
e6bd18f5 | 571 | return -EACCES; |
f73a1dbc | 572 | } |
e6bd18f5 | 573 | |
08f0e161 | 574 | if (count < sizeof(hdr)) |
bc38a6ab RD |
575 | return -EINVAL; |
576 | ||
08f0e161 | 577 | if (copy_from_user(&hdr, buf, sizeof(hdr))) |
bc38a6ab RD |
578 | return -EFAULT; |
579 | ||
d120c3c9 JG |
580 | method_elm = uapi_get_method(uapi, hdr.command); |
581 | if (IS_ERR(method_elm)) | |
582 | return PTR_ERR(method_elm); | |
77833b8a | 583 | |
d120c3c9 | 584 | if (method_elm->is_ex) { |
e21719fb LR |
585 | if (count < (sizeof(hdr) + sizeof(ex_hdr))) |
586 | return -EINVAL; | |
587 | if (copy_from_user(&ex_hdr, buf + sizeof(hdr), sizeof(ex_hdr))) | |
588 | return -EFAULT; | |
589 | } | |
77833b8a | 590 | |
da0f60df | 591 | ret = verify_hdr(&hdr, &ex_hdr, count, method_elm); |
6284380a LR |
592 | if (ret) |
593 | return ret; | |
594 | ||
036b1063 | 595 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
036b1063 | 596 | |
6284380a | 597 | buf += sizeof(hdr); |
400dbc96 | 598 | |
d6f4a21f | 599 | memset(bundle.attr_present, 0, sizeof(bundle.attr_present)); |
8313c10f | 600 | bundle.ufile = file; |
3d9dfd06 | 601 | bundle.context = NULL; /* only valid if bundle has uobject */ |
d120c3c9 | 602 | if (!method_elm->is_ex) { |
3a6532c9 JG |
603 | size_t in_len = hdr.in_words * 4 - sizeof(hdr); |
604 | size_t out_len = hdr.out_words * 4; | |
c2a939fd | 605 | u64 response = 0; |
3a6532c9 JG |
606 | |
607 | if (method_elm->has_udata) { | |
608 | bundle.driver_udata.inlen = | |
609 | in_len - method_elm->req_size; | |
610 | in_len = method_elm->req_size; | |
611 | if (bundle.driver_udata.inlen) | |
612 | bundle.driver_udata.inbuf = buf + in_len; | |
613 | else | |
614 | bundle.driver_udata.inbuf = NULL; | |
615 | } else { | |
616 | memset(&bundle.driver_udata, 0, | |
617 | sizeof(bundle.driver_udata)); | |
618 | } | |
619 | ||
620 | if (method_elm->has_resp) { | |
3a6532c9 JG |
621 | /* |
622 | * The macros check that if has_resp is set | |
623 | * then the command request structure starts | |
624 | * with a '__aligned u64 response' member. | |
625 | */ | |
259e66bc | 626 | ret = get_user(response, (const u64 __user *)buf); |
3a6532c9 JG |
627 | if (ret) |
628 | goto out_unlock; | |
629 | ||
630 | if (method_elm->has_udata) { | |
631 | bundle.driver_udata.outlen = | |
632 | out_len - method_elm->resp_size; | |
633 | out_len = method_elm->resp_size; | |
634 | if (bundle.driver_udata.outlen) | |
635 | bundle.driver_udata.outbuf = | |
636 | u64_to_user_ptr(response + | |
637 | out_len); | |
638 | else | |
639 | bundle.driver_udata.outbuf = NULL; | |
640 | } | |
641 | } else { | |
642 | bundle.driver_udata.outlen = 0; | |
643 | bundle.driver_udata.outbuf = NULL; | |
644 | } | |
645 | ||
c2a939fd JG |
646 | ib_uverbs_init_udata_buf_or_null( |
647 | &bundle.ucore, buf, u64_to_user_ptr(response), | |
648 | in_len, out_len); | |
a6c4a66a | 649 | } else { |
6284380a | 650 | buf += sizeof(ex_hdr); |
f21519b2 | 651 | |
c2a939fd | 652 | ib_uverbs_init_udata_buf_or_null(&bundle.ucore, buf, |
12f72772 AB |
653 | u64_to_user_ptr(ex_hdr.response), |
654 | hdr.in_words * 8, hdr.out_words * 8); | |
a96e4e2f | 655 | |
c2a939fd JG |
656 | ib_uverbs_init_udata_buf_or_null( |
657 | &bundle.driver_udata, buf + bundle.ucore.inlen, | |
658 | u64_to_user_ptr(ex_hdr.response) + bundle.ucore.outlen, | |
659 | ex_hdr.provider_in_words * 8, | |
660 | ex_hdr.provider_out_words * 8); | |
f21519b2 | 661 | |
400dbc96 | 662 | } |
f21519b2 | 663 | |
974d6b4b | 664 | ret = method_elm->handler(&bundle); |
3a6532c9 | 665 | out_unlock: |
036b1063 | 666 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); |
7106a976 | 667 | return (ret) ? : count; |
bc38a6ab RD |
668 | } |
669 | ||
b86deba9 MK |
670 | static const struct vm_operations_struct rdma_umap_ops; |
671 | ||
bc38a6ab RD |
672 | static int ib_uverbs_mmap(struct file *filp, struct vm_area_struct *vma) |
673 | { | |
674 | struct ib_uverbs_file *file = filp->private_data; | |
22fa27fb | 675 | struct ib_ucontext *ucontext; |
036b1063 YH |
676 | int ret = 0; |
677 | int srcu_key; | |
bc38a6ab | 678 | |
036b1063 | 679 | srcu_key = srcu_read_lock(&file->device->disassociate_srcu); |
8313c10f | 680 | ucontext = ib_uverbs_get_ucontext_file(file); |
22fa27fb JG |
681 | if (IS_ERR(ucontext)) { |
682 | ret = PTR_ERR(ucontext); | |
036b1063 YH |
683 | goto out; |
684 | } | |
b86deba9 | 685 | vma->vm_ops = &rdma_umap_ops; |
3023a1e9 | 686 | ret = ucontext->device->ops.mmap(ucontext, vma); |
036b1063 YH |
687 | out: |
688 | srcu_read_unlock(&file->device->disassociate_srcu, srcu_key); | |
689 | return ret; | |
bc38a6ab RD |
690 | } |
691 | ||
5f9794dc JG |
692 | /* |
693 | * The VMA has been dup'd, initialize the vm_private_data with a new tracking | |
694 | * struct | |
695 | */ | |
696 | static void rdma_umap_open(struct vm_area_struct *vma) | |
697 | { | |
698 | struct ib_uverbs_file *ufile = vma->vm_file->private_data; | |
699 | struct rdma_umap_priv *opriv = vma->vm_private_data; | |
700 | struct rdma_umap_priv *priv; | |
701 | ||
702 | if (!opriv) | |
703 | return; | |
704 | ||
705 | /* We are racing with disassociation */ | |
706 | if (!down_read_trylock(&ufile->hw_destroy_rwsem)) | |
707 | goto out_zap; | |
708 | /* | |
709 | * Disassociation already completed, the VMA should already be zapped. | |
710 | */ | |
711 | if (!ufile->ucontext) | |
712 | goto out_unlock; | |
713 | ||
714 | priv = kzalloc(sizeof(*priv), GFP_KERNEL); | |
715 | if (!priv) | |
716 | goto out_unlock; | |
c043ff2c | 717 | rdma_umap_priv_init(priv, vma, opriv->entry); |
5f9794dc JG |
718 | |
719 | up_read(&ufile->hw_destroy_rwsem); | |
720 | return; | |
721 | ||
722 | out_unlock: | |
723 | up_read(&ufile->hw_destroy_rwsem); | |
724 | out_zap: | |
725 | /* | |
726 | * We can't allow the VMA to be created with the actual IO pages, that | |
727 | * would break our API contract, and it can't be stopped at this | |
728 | * point, so zap it. | |
729 | */ | |
730 | vma->vm_private_data = NULL; | |
731 | zap_vma_ptes(vma, vma->vm_start, vma->vm_end - vma->vm_start); | |
732 | } | |
733 | ||
734 | static void rdma_umap_close(struct vm_area_struct *vma) | |
735 | { | |
736 | struct ib_uverbs_file *ufile = vma->vm_file->private_data; | |
737 | struct rdma_umap_priv *priv = vma->vm_private_data; | |
738 | ||
739 | if (!priv) | |
740 | return; | |
741 | ||
742 | /* | |
743 | * The vma holds a reference on the struct file that created it, which | |
744 | * in turn means that the ib_uverbs_file is guaranteed to exist at | |
745 | * this point. | |
746 | */ | |
747 | mutex_lock(&ufile->umap_lock); | |
c043ff2c MK |
748 | if (priv->entry) |
749 | rdma_user_mmap_entry_put(priv->entry); | |
750 | ||
5f9794dc JG |
751 | list_del(&priv->list); |
752 | mutex_unlock(&ufile->umap_lock); | |
753 | kfree(priv); | |
754 | } | |
755 | ||
67f269b3 JG |
756 | /* |
757 | * Once the zap_vma_ptes has been called touches to the VMA will come here and | |
758 | * we return a dummy writable zero page for all the pfns. | |
759 | */ | |
760 | static vm_fault_t rdma_umap_fault(struct vm_fault *vmf) | |
761 | { | |
762 | struct ib_uverbs_file *ufile = vmf->vma->vm_file->private_data; | |
763 | struct rdma_umap_priv *priv = vmf->vma->vm_private_data; | |
764 | vm_fault_t ret = 0; | |
765 | ||
766 | if (!priv) | |
767 | return VM_FAULT_SIGBUS; | |
768 | ||
769 | /* Read only pages can just use the system zero page. */ | |
770 | if (!(vmf->vma->vm_flags & (VM_WRITE | VM_MAYWRITE))) { | |
6a5c5d26 | 771 | vmf->page = ZERO_PAGE(vmf->address); |
67f269b3 JG |
772 | get_page(vmf->page); |
773 | return 0; | |
774 | } | |
775 | ||
776 | mutex_lock(&ufile->umap_lock); | |
777 | if (!ufile->disassociate_page) | |
778 | ufile->disassociate_page = | |
779 | alloc_pages(vmf->gfp_mask | __GFP_ZERO, 0); | |
780 | ||
781 | if (ufile->disassociate_page) { | |
782 | /* | |
783 | * This VMA is forced to always be shared so this doesn't have | |
784 | * to worry about COW. | |
785 | */ | |
786 | vmf->page = ufile->disassociate_page; | |
787 | get_page(vmf->page); | |
788 | } else { | |
789 | ret = VM_FAULT_SIGBUS; | |
790 | } | |
791 | mutex_unlock(&ufile->umap_lock); | |
792 | ||
793 | return ret; | |
794 | } | |
795 | ||
5f9794dc JG |
796 | static const struct vm_operations_struct rdma_umap_ops = { |
797 | .open = rdma_umap_open, | |
798 | .close = rdma_umap_close, | |
67f269b3 | 799 | .fault = rdma_umap_fault, |
5f9794dc JG |
800 | }; |
801 | ||
5f9794dc JG |
802 | void uverbs_user_mmap_disassociate(struct ib_uverbs_file *ufile) |
803 | { | |
804 | struct rdma_umap_priv *priv, *next_priv; | |
805 | ||
806 | lockdep_assert_held(&ufile->hw_destroy_rwsem); | |
807 | ||
808 | while (1) { | |
809 | struct mm_struct *mm = NULL; | |
810 | ||
811 | /* Get an arbitrary mm pointer that hasn't been cleaned yet */ | |
812 | mutex_lock(&ufile->umap_lock); | |
7b21b69a YH |
813 | while (!list_empty(&ufile->umaps)) { |
814 | int ret; | |
815 | ||
816 | priv = list_first_entry(&ufile->umaps, | |
817 | struct rdma_umap_priv, list); | |
818 | mm = priv->vma->vm_mm; | |
819 | ret = mmget_not_zero(mm); | |
820 | if (!ret) { | |
821 | list_del_init(&priv->list); | |
39c011a5 JG |
822 | if (priv->entry) { |
823 | rdma_user_mmap_entry_put(priv->entry); | |
824 | priv->entry = NULL; | |
825 | } | |
7b21b69a YH |
826 | mm = NULL; |
827 | continue; | |
828 | } | |
829 | break; | |
5f9794dc JG |
830 | } |
831 | mutex_unlock(&ufile->umap_lock); | |
832 | if (!mm) | |
833 | return; | |
834 | ||
835 | /* | |
836 | * The umap_lock is nested under mmap_sem since it used within | |
837 | * the vma_ops callbacks, so we have to clean the list one mm | |
838 | * at a time to get the lock ordering right. Typically there | |
839 | * will only be one mm, so no big deal. | |
840 | */ | |
67f269b3 | 841 | down_read(&mm->mmap_sem); |
04f5866e AA |
842 | if (!mmget_still_valid(mm)) |
843 | goto skip_mm; | |
5f9794dc JG |
844 | mutex_lock(&ufile->umap_lock); |
845 | list_for_each_entry_safe (priv, next_priv, &ufile->umaps, | |
846 | list) { | |
847 | struct vm_area_struct *vma = priv->vma; | |
848 | ||
849 | if (vma->vm_mm != mm) | |
850 | continue; | |
851 | list_del_init(&priv->list); | |
852 | ||
853 | zap_vma_ptes(vma, vma->vm_start, | |
854 | vma->vm_end - vma->vm_start); | |
c043ff2c MK |
855 | |
856 | if (priv->entry) { | |
857 | rdma_user_mmap_entry_put(priv->entry); | |
858 | priv->entry = NULL; | |
859 | } | |
5f9794dc JG |
860 | } |
861 | mutex_unlock(&ufile->umap_lock); | |
04f5866e | 862 | skip_mm: |
67f269b3 | 863 | up_read(&mm->mmap_sem); |
5f9794dc JG |
864 | mmput(mm); |
865 | } | |
866 | } | |
867 | ||
5b2d281a RD |
868 | /* |
869 | * ib_uverbs_open() does not need the BKL: | |
870 | * | |
2a72f212 | 871 | * - the ib_uverbs_device structures are properly reference counted and |
5b2d281a RD |
872 | * everything else is purely local to the file being created, so |
873 | * races against other open calls are not a problem; | |
874 | * - there is no ioctl method to race against; | |
2a72f212 AC |
875 | * - the open method will either immediately run -ENXIO, or all |
876 | * required initialization will be done. | |
5b2d281a | 877 | */ |
bc38a6ab RD |
878 | static int ib_uverbs_open(struct inode *inode, struct file *filp) |
879 | { | |
70a30e16 | 880 | struct ib_uverbs_device *dev; |
bc38a6ab | 881 | struct ib_uverbs_file *file; |
036b1063 | 882 | struct ib_device *ib_dev; |
70a30e16 | 883 | int ret; |
036b1063 YH |
884 | int module_dependent; |
885 | int srcu_key; | |
bc38a6ab | 886 | |
2a72f212 | 887 | dev = container_of(inode->i_cdev, struct ib_uverbs_device, cdev); |
35d4a0b6 | 888 | if (!atomic_inc_not_zero(&dev->refcount)) |
70a30e16 RD |
889 | return -ENXIO; |
890 | ||
c5c4d92e | 891 | get_device(&dev->dev); |
036b1063 YH |
892 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
893 | mutex_lock(&dev->lists_mutex); | |
894 | ib_dev = srcu_dereference(dev->ib_dev, | |
895 | &dev->disassociate_srcu); | |
896 | if (!ib_dev) { | |
897 | ret = -EIO; | |
70a30e16 RD |
898 | goto err; |
899 | } | |
bc38a6ab | 900 | |
41c61401 PP |
901 | if (!rdma_dev_access_netns(ib_dev, current->nsproxy->net_ns)) { |
902 | ret = -EPERM; | |
903 | goto err; | |
904 | } | |
905 | ||
036b1063 YH |
906 | /* In case IB device supports disassociate ucontext, there is no hard |
907 | * dependency between uverbs device and its low level device. | |
908 | */ | |
3023a1e9 | 909 | module_dependent = !(ib_dev->ops.disassociate_ucontext); |
036b1063 YH |
910 | |
911 | if (module_dependent) { | |
7a154142 | 912 | if (!try_module_get(ib_dev->ops.owner)) { |
036b1063 YH |
913 | ret = -ENODEV; |
914 | goto err; | |
915 | } | |
916 | } | |
917 | ||
918 | file = kzalloc(sizeof(*file), GFP_KERNEL); | |
63c47c28 | 919 | if (!file) { |
70a30e16 | 920 | ret = -ENOMEM; |
036b1063 YH |
921 | if (module_dependent) |
922 | goto err_module; | |
923 | ||
924 | goto err; | |
63c47c28 | 925 | } |
bc38a6ab | 926 | |
70a30e16 | 927 | file->device = dev; |
bc38a6ab | 928 | kref_init(&file->ref); |
e951747a | 929 | mutex_init(&file->ucontext_lock); |
bc38a6ab | 930 | |
87064277 | 931 | spin_lock_init(&file->uobjects_lock); |
6a5e9c88 | 932 | INIT_LIST_HEAD(&file->uobjects); |
87064277 | 933 | init_rwsem(&file->hw_destroy_rwsem); |
5f9794dc JG |
934 | mutex_init(&file->umap_lock); |
935 | INIT_LIST_HEAD(&file->umaps); | |
6a5e9c88 | 936 | |
bc38a6ab | 937 | filp->private_data = file; |
036b1063 YH |
938 | list_add_tail(&file->list, &dev->uverbs_file_list); |
939 | mutex_unlock(&dev->lists_mutex); | |
940 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
bc38a6ab | 941 | |
0f50d88a JG |
942 | setup_ufile_idr_uobject(file); |
943 | ||
c5bf68fe | 944 | return stream_open(inode, filp); |
70a30e16 RD |
945 | |
946 | err_module: | |
7a154142 | 947 | module_put(ib_dev->ops.owner); |
70a30e16 RD |
948 | |
949 | err: | |
036b1063 YH |
950 | mutex_unlock(&dev->lists_mutex); |
951 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); | |
35d4a0b6 YH |
952 | if (atomic_dec_and_test(&dev->refcount)) |
953 | ib_uverbs_comp_dev(dev); | |
954 | ||
c5c4d92e | 955 | put_device(&dev->dev); |
70a30e16 | 956 | return ret; |
bc38a6ab RD |
957 | } |
958 | ||
959 | static int ib_uverbs_close(struct inode *inode, struct file *filp) | |
960 | { | |
961 | struct ib_uverbs_file *file = filp->private_data; | |
d1e09f30 | 962 | |
e951747a | 963 | uverbs_destroy_ufile_hw(file, RDMA_REMOVE_CLOSE); |
036b1063 YH |
964 | |
965 | mutex_lock(&file->device->lists_mutex); | |
6ebce447 | 966 | list_del_init(&file->list); |
036b1063 | 967 | mutex_unlock(&file->device->lists_mutex); |
70a30e16 | 968 | |
bc38a6ab RD |
969 | kref_put(&file->ref, ib_uverbs_release_file); |
970 | ||
971 | return 0; | |
972 | } | |
973 | ||
2b8693c0 | 974 | static const struct file_operations uverbs_fops = { |
9afed76d AC |
975 | .owner = THIS_MODULE, |
976 | .write = ib_uverbs_write, | |
977 | .open = ib_uverbs_open, | |
bc1db9af RD |
978 | .release = ib_uverbs_close, |
979 | .llseek = no_llseek, | |
8eb19e8e | 980 | .unlocked_ioctl = ib_uverbs_ioctl, |
1832f2d8 | 981 | .compat_ioctl = compat_ptr_ioctl, |
bc38a6ab RD |
982 | }; |
983 | ||
2b8693c0 | 984 | static const struct file_operations uverbs_mmap_fops = { |
9afed76d AC |
985 | .owner = THIS_MODULE, |
986 | .write = ib_uverbs_write, | |
bc38a6ab | 987 | .mmap = ib_uverbs_mmap, |
9afed76d | 988 | .open = ib_uverbs_open, |
bc1db9af RD |
989 | .release = ib_uverbs_close, |
990 | .llseek = no_llseek, | |
8eb19e8e | 991 | .unlocked_ioctl = ib_uverbs_ioctl, |
1832f2d8 | 992 | .compat_ioctl = compat_ptr_ioctl, |
bc38a6ab RD |
993 | }; |
994 | ||
8f71bb00 JG |
995 | static int ib_uverbs_get_nl_info(struct ib_device *ibdev, void *client_data, |
996 | struct ib_client_nl_info *res) | |
997 | { | |
998 | struct ib_uverbs_device *uverbs_dev = client_data; | |
999 | int ret; | |
1000 | ||
1001 | if (res->port != -1) | |
1002 | return -EINVAL; | |
1003 | ||
1004 | res->abi = ibdev->ops.uverbs_abi_ver; | |
1005 | res->cdev = &uverbs_dev->dev; | |
1006 | ||
1007 | /* | |
1008 | * To support DRIVER_ID binding in userspace some of the driver need | |
1009 | * upgrading to expose their PCI dependent revision information | |
1010 | * through get_context instead of relying on modalias matching. When | |
1011 | * the drivers are fixed they can drop this flag. | |
1012 | */ | |
1013 | if (!ibdev->ops.uverbs_no_driver_id_binding) { | |
1014 | ret = nla_put_u32(res->nl_msg, RDMA_NLDEV_ATTR_UVERBS_DRIVER_ID, | |
1015 | ibdev->ops.driver_id); | |
1016 | if (ret) | |
1017 | return ret; | |
1018 | } | |
1019 | return 0; | |
1020 | } | |
1021 | ||
bc38a6ab RD |
1022 | static struct ib_client uverbs_client = { |
1023 | .name = "uverbs", | |
6780c4fa | 1024 | .no_kverbs_req = true, |
bc38a6ab | 1025 | .add = ib_uverbs_add_one, |
8f71bb00 JG |
1026 | .remove = ib_uverbs_remove_one, |
1027 | .get_nl_info = ib_uverbs_get_nl_info, | |
bc38a6ab | 1028 | }; |
8f71bb00 | 1029 | MODULE_ALIAS_RDMA_CLIENT("uverbs"); |
bc38a6ab | 1030 | |
b53b1c08 | 1031 | static ssize_t ibdev_show(struct device *device, struct device_attribute *attr, |
f4e91eb4 | 1032 | char *buf) |
bc38a6ab | 1033 | { |
c5c4d92e PP |
1034 | struct ib_uverbs_device *dev = |
1035 | container_of(device, struct ib_uverbs_device, dev); | |
036b1063 YH |
1036 | int ret = -ENODEV; |
1037 | int srcu_key; | |
036b1063 | 1038 | struct ib_device *ib_dev; |
70a30e16 | 1039 | |
036b1063 YH |
1040 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1041 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1042 | if (ib_dev) | |
896de009 | 1043 | ret = sprintf(buf, "%s\n", dev_name(&ib_dev->dev)); |
036b1063 YH |
1044 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
1045 | ||
1046 | return ret; | |
bc38a6ab | 1047 | } |
b53b1c08 | 1048 | static DEVICE_ATTR_RO(ibdev); |
bc38a6ab | 1049 | |
b53b1c08 PP |
1050 | static ssize_t abi_version_show(struct device *device, |
1051 | struct device_attribute *attr, char *buf) | |
274c0891 | 1052 | { |
c5c4d92e PP |
1053 | struct ib_uverbs_device *dev = |
1054 | container_of(device, struct ib_uverbs_device, dev); | |
036b1063 YH |
1055 | int ret = -ENODEV; |
1056 | int srcu_key; | |
1057 | struct ib_device *ib_dev; | |
70a30e16 | 1058 | |
036b1063 YH |
1059 | srcu_key = srcu_read_lock(&dev->disassociate_srcu); |
1060 | ib_dev = srcu_dereference(dev->ib_dev, &dev->disassociate_srcu); | |
1061 | if (ib_dev) | |
72c6ec18 | 1062 | ret = sprintf(buf, "%u\n", ib_dev->ops.uverbs_abi_ver); |
036b1063 | 1063 | srcu_read_unlock(&dev->disassociate_srcu, srcu_key); |
274c0891 | 1064 | |
036b1063 | 1065 | return ret; |
274c0891 | 1066 | } |
b53b1c08 PP |
1067 | static DEVICE_ATTR_RO(abi_version); |
1068 | ||
1069 | static struct attribute *ib_dev_attrs[] = { | |
1070 | &dev_attr_abi_version.attr, | |
1071 | &dev_attr_ibdev.attr, | |
1072 | NULL, | |
1073 | }; | |
1074 | ||
1075 | static const struct attribute_group dev_attr_group = { | |
1076 | .attrs = ib_dev_attrs, | |
1077 | }; | |
274c0891 | 1078 | |
0933e2d9 AK |
1079 | static CLASS_ATTR_STRING(abi_version, S_IRUGO, |
1080 | __stringify(IB_USER_VERBS_ABI_VERSION)); | |
bc38a6ab | 1081 | |
7d96c9b1 JG |
1082 | static int ib_uverbs_create_uapi(struct ib_device *device, |
1083 | struct ib_uverbs_device *uverbs_dev) | |
1084 | { | |
9ed3e5f4 | 1085 | struct uverbs_api *uapi; |
7d96c9b1 | 1086 | |
6829c1c2 | 1087 | uapi = uverbs_alloc_api(device); |
51d0a2b4 | 1088 | if (IS_ERR(uapi)) |
9ed3e5f4 | 1089 | return PTR_ERR(uapi); |
9ed3e5f4 | 1090 | |
9ed3e5f4 | 1091 | uverbs_dev->uapi = uapi; |
7d96c9b1 JG |
1092 | return 0; |
1093 | } | |
1094 | ||
bc38a6ab RD |
1095 | static void ib_uverbs_add_one(struct ib_device *device) |
1096 | { | |
38707980 | 1097 | int devnum; |
ddbd6883 | 1098 | dev_t base; |
bc38a6ab | 1099 | struct ib_uverbs_device *uverbs_dev; |
036b1063 | 1100 | int ret; |
bc38a6ab | 1101 | |
3023a1e9 | 1102 | if (!device->ops.alloc_ucontext) |
bc38a6ab RD |
1103 | return; |
1104 | ||
08f0e161 | 1105 | uverbs_dev = kzalloc(sizeof(*uverbs_dev), GFP_KERNEL); |
bc38a6ab RD |
1106 | if (!uverbs_dev) |
1107 | return; | |
1108 | ||
036b1063 YH |
1109 | ret = init_srcu_struct(&uverbs_dev->disassociate_srcu); |
1110 | if (ret) { | |
1111 | kfree(uverbs_dev); | |
1112 | return; | |
1113 | } | |
1114 | ||
00991039 JG |
1115 | device_initialize(&uverbs_dev->dev); |
1116 | uverbs_dev->dev.class = uverbs_class; | |
1117 | uverbs_dev->dev.parent = device->dev.parent; | |
1118 | uverbs_dev->dev.release = ib_uverbs_release_dev; | |
1119 | uverbs_dev->groups[0] = &dev_attr_group; | |
1120 | uverbs_dev->dev.groups = uverbs_dev->groups; | |
35d4a0b6 | 1121 | atomic_set(&uverbs_dev->refcount, 1); |
fd60ae40 | 1122 | init_completion(&uverbs_dev->comp); |
53d0bd1e SH |
1123 | uverbs_dev->xrcd_tree = RB_ROOT; |
1124 | mutex_init(&uverbs_dev->xrcd_tree_mutex); | |
036b1063 YH |
1125 | mutex_init(&uverbs_dev->lists_mutex); |
1126 | INIT_LIST_HEAD(&uverbs_dev->uverbs_file_list); | |
00991039 JG |
1127 | rcu_assign_pointer(uverbs_dev->ib_dev, device); |
1128 | uverbs_dev->num_comp_vectors = device->num_comp_vectors; | |
70a30e16 | 1129 | |
90f6e41c LR |
1130 | devnum = ida_alloc_max(&uverbs_ida, IB_UVERBS_MAX_DEVICES - 1, |
1131 | GFP_KERNEL); | |
1132 | if (devnum < 0) | |
8cf12d77 HN |
1133 | goto err; |
1134 | uverbs_dev->devnum = devnum; | |
8cf12d77 HN |
1135 | if (devnum >= IB_UVERBS_NUM_FIXED_MINOR) |
1136 | base = dynamic_uverbs_dev + devnum - IB_UVERBS_NUM_FIXED_MINOR; | |
1137 | else | |
1138 | base = IB_UVERBS_BASE_DEV + devnum; | |
bc38a6ab | 1139 | |
7d96c9b1 | 1140 | if (ib_uverbs_create_uapi(device, uverbs_dev)) |
08e74be1 | 1141 | goto err_uapi; |
7d96c9b1 | 1142 | |
c5c4d92e | 1143 | uverbs_dev->dev.devt = base; |
c5c4d92e PP |
1144 | dev_set_name(&uverbs_dev->dev, "uverbs%d", uverbs_dev->devnum); |
1145 | ||
1146 | cdev_init(&uverbs_dev->cdev, | |
3023a1e9 | 1147 | device->ops.mmap ? &uverbs_mmap_fops : &uverbs_fops); |
055422dd | 1148 | uverbs_dev->cdev.owner = THIS_MODULE; |
bc38a6ab | 1149 | |
c5c4d92e PP |
1150 | ret = cdev_device_add(&uverbs_dev->cdev, &uverbs_dev->dev); |
1151 | if (ret) | |
00991039 | 1152 | goto err_uapi; |
bc38a6ab | 1153 | |
bc38a6ab | 1154 | ib_set_client_data(device, &uverbs_client, uverbs_dev); |
bc38a6ab RD |
1155 | return; |
1156 | ||
08e74be1 | 1157 | err_uapi: |
90f6e41c | 1158 | ida_free(&uverbs_ida, devnum); |
bc38a6ab | 1159 | err: |
35d4a0b6 YH |
1160 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1161 | ib_uverbs_comp_dev(uverbs_dev); | |
fd60ae40 | 1162 | wait_for_completion(&uverbs_dev->comp); |
00991039 | 1163 | put_device(&uverbs_dev->dev); |
bc38a6ab RD |
1164 | return; |
1165 | } | |
1166 | ||
036b1063 YH |
1167 | static void ib_uverbs_free_hw_resources(struct ib_uverbs_device *uverbs_dev, |
1168 | struct ib_device *ib_dev) | |
1169 | { | |
1170 | struct ib_uverbs_file *file; | |
036b1063 YH |
1171 | |
1172 | /* Pending running commands to terminate */ | |
9ed3e5f4 | 1173 | uverbs_disassociate_api_pre(uverbs_dev); |
036b1063 YH |
1174 | |
1175 | mutex_lock(&uverbs_dev->lists_mutex); | |
1176 | while (!list_empty(&uverbs_dev->uverbs_file_list)) { | |
036b1063 YH |
1177 | file = list_first_entry(&uverbs_dev->uverbs_file_list, |
1178 | struct ib_uverbs_file, list); | |
6ebce447 | 1179 | list_del_init(&file->list); |
036b1063 | 1180 | kref_get(&file->ref); |
d1e09f30 | 1181 | |
e951747a JG |
1182 | /* We must release the mutex before going ahead and calling |
1183 | * uverbs_cleanup_ufile, as it might end up indirectly calling | |
1184 | * uverbs_close, for example due to freeing the resources (e.g | |
1185 | * mmput). | |
d1e09f30 | 1186 | */ |
e951747a | 1187 | mutex_unlock(&uverbs_dev->lists_mutex); |
036b1063 | 1188 | |
e951747a | 1189 | uverbs_destroy_ufile_hw(file, RDMA_REMOVE_DRIVER_REMOVE); |
036b1063 | 1190 | kref_put(&file->ref, ib_uverbs_release_file); |
e951747a JG |
1191 | |
1192 | mutex_lock(&uverbs_dev->lists_mutex); | |
036b1063 | 1193 | } |
036b1063 | 1194 | mutex_unlock(&uverbs_dev->lists_mutex); |
9ed3e5f4 JG |
1195 | |
1196 | uverbs_disassociate_api(uverbs_dev->uapi); | |
036b1063 YH |
1197 | } |
1198 | ||
7c1eb45a | 1199 | static void ib_uverbs_remove_one(struct ib_device *device, void *client_data) |
bc38a6ab | 1200 | { |
7c1eb45a | 1201 | struct ib_uverbs_device *uverbs_dev = client_data; |
036b1063 | 1202 | int wait_clients = 1; |
bc38a6ab RD |
1203 | |
1204 | if (!uverbs_dev) | |
1205 | return; | |
1206 | ||
c5c4d92e | 1207 | cdev_device_del(&uverbs_dev->cdev, &uverbs_dev->dev); |
90f6e41c | 1208 | ida_free(&uverbs_ida, uverbs_dev->devnum); |
fd60ae40 | 1209 | |
3023a1e9 | 1210 | if (device->ops.disassociate_ucontext) { |
036b1063 YH |
1211 | /* We disassociate HW resources and immediately return. |
1212 | * Userspace will see a EIO errno for all future access. | |
1213 | * Upon returning, ib_device may be freed internally and is not | |
1214 | * valid any more. | |
1215 | * uverbs_device is still available until all clients close | |
1216 | * their files, then the uverbs device ref count will be zero | |
1217 | * and its resources will be freed. | |
1218 | * Note: At this point no more files can be opened since the | |
1219 | * cdev was deleted, however active clients can still issue | |
1220 | * commands and close their open files. | |
1221 | */ | |
036b1063 YH |
1222 | ib_uverbs_free_hw_resources(uverbs_dev, device); |
1223 | wait_clients = 0; | |
1224 | } | |
1225 | ||
35d4a0b6 YH |
1226 | if (atomic_dec_and_test(&uverbs_dev->refcount)) |
1227 | ib_uverbs_comp_dev(uverbs_dev); | |
036b1063 YH |
1228 | if (wait_clients) |
1229 | wait_for_completion(&uverbs_dev->comp); | |
52427112 | 1230 | |
c5c4d92e | 1231 | put_device(&uverbs_dev->dev); |
bc38a6ab RD |
1232 | } |
1233 | ||
2c9ede55 | 1234 | static char *uverbs_devnode(struct device *dev, umode_t *mode) |
71c29bd5 | 1235 | { |
b2bc4782 GR |
1236 | if (mode) |
1237 | *mode = 0666; | |
71c29bd5 RD |
1238 | return kasprintf(GFP_KERNEL, "infiniband/%s", dev_name(dev)); |
1239 | } | |
1240 | ||
bc38a6ab RD |
1241 | static int __init ib_uverbs_init(void) |
1242 | { | |
1243 | int ret; | |
1244 | ||
8cf12d77 HN |
1245 | ret = register_chrdev_region(IB_UVERBS_BASE_DEV, |
1246 | IB_UVERBS_NUM_FIXED_MINOR, | |
bc38a6ab RD |
1247 | "infiniband_verbs"); |
1248 | if (ret) { | |
aba25a3e | 1249 | pr_err("user_verbs: couldn't register device number\n"); |
bc38a6ab RD |
1250 | goto out; |
1251 | } | |
1252 | ||
8cf12d77 HN |
1253 | ret = alloc_chrdev_region(&dynamic_uverbs_dev, 0, |
1254 | IB_UVERBS_NUM_DYNAMIC_MINOR, | |
1255 | "infiniband_verbs"); | |
1256 | if (ret) { | |
1257 | pr_err("couldn't register dynamic device number\n"); | |
1258 | goto out_alloc; | |
1259 | } | |
1260 | ||
70a30e16 RD |
1261 | uverbs_class = class_create(THIS_MODULE, "infiniband_verbs"); |
1262 | if (IS_ERR(uverbs_class)) { | |
1263 | ret = PTR_ERR(uverbs_class); | |
aba25a3e | 1264 | pr_err("user_verbs: couldn't create class infiniband_verbs\n"); |
bc38a6ab RD |
1265 | goto out_chrdev; |
1266 | } | |
1267 | ||
71c29bd5 RD |
1268 | uverbs_class->devnode = uverbs_devnode; |
1269 | ||
0933e2d9 | 1270 | ret = class_create_file(uverbs_class, &class_attr_abi_version.attr); |
bc38a6ab | 1271 | if (ret) { |
aba25a3e | 1272 | pr_err("user_verbs: couldn't create abi_version attribute\n"); |
bc38a6ab RD |
1273 | goto out_class; |
1274 | } | |
1275 | ||
bc38a6ab RD |
1276 | ret = ib_register_client(&uverbs_client); |
1277 | if (ret) { | |
aba25a3e | 1278 | pr_err("user_verbs: couldn't register client\n"); |
a265e558 | 1279 | goto out_class; |
bc38a6ab RD |
1280 | } |
1281 | ||
1282 | return 0; | |
1283 | ||
bc38a6ab | 1284 | out_class: |
70a30e16 | 1285 | class_destroy(uverbs_class); |
bc38a6ab RD |
1286 | |
1287 | out_chrdev: | |
8cf12d77 HN |
1288 | unregister_chrdev_region(dynamic_uverbs_dev, |
1289 | IB_UVERBS_NUM_DYNAMIC_MINOR); | |
1290 | ||
1291 | out_alloc: | |
1292 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, | |
1293 | IB_UVERBS_NUM_FIXED_MINOR); | |
bc38a6ab RD |
1294 | |
1295 | out: | |
1296 | return ret; | |
1297 | } | |
1298 | ||
1299 | static void __exit ib_uverbs_cleanup(void) | |
1300 | { | |
1301 | ib_unregister_client(&uverbs_client); | |
70a30e16 | 1302 | class_destroy(uverbs_class); |
8cf12d77 HN |
1303 | unregister_chrdev_region(IB_UVERBS_BASE_DEV, |
1304 | IB_UVERBS_NUM_FIXED_MINOR); | |
1305 | unregister_chrdev_region(dynamic_uverbs_dev, | |
1306 | IB_UVERBS_NUM_DYNAMIC_MINOR); | |
c571feca | 1307 | mmu_notifier_synchronize(); |
bc38a6ab RD |
1308 | } |
1309 | ||
1310 | module_init(ib_uverbs_init); | |
1311 | module_exit(ib_uverbs_cleanup); |