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38321256 MB |
1 | /* |
2 | * Copyright (c) 2016, Mellanox Technologies inc. All rights reserved. | |
3 | * | |
4 | * This software is available to you under a choice of one of two | |
5 | * licenses. You may choose to be licensed under the terms of the GNU | |
6 | * General Public License (GPL) Version 2, available from the file | |
7 | * COPYING in the main directory of this source tree, or the | |
8 | * OpenIB.org BSD license below: | |
9 | * | |
10 | * Redistribution and use in source and binary forms, with or | |
11 | * without modification, are permitted provided that the following | |
12 | * conditions are met: | |
13 | * | |
14 | * - Redistributions of source code must retain the above | |
15 | * copyright notice, this list of conditions and the following | |
16 | * disclaimer. | |
17 | * | |
18 | * - Redistributions in binary form must reproduce the above | |
19 | * copyright notice, this list of conditions and the following | |
20 | * disclaimer in the documentation and/or other materials | |
21 | * provided with the distribution. | |
22 | * | |
23 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, | |
24 | * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF | |
25 | * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND | |
26 | * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS | |
27 | * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN | |
28 | * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN | |
29 | * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | |
30 | * SOFTWARE. | |
31 | */ | |
32 | ||
33 | #include <linux/file.h> | |
34 | #include <linux/anon_inodes.h> | |
e951747a | 35 | #include <linux/sched/mm.h> |
38321256 MB |
36 | #include <rdma/ib_verbs.h> |
37 | #include <rdma/uverbs_types.h> | |
38 | #include <linux/rcupdate.h> | |
a0aa309c | 39 | #include <rdma/uverbs_ioctl.h> |
fac9658c | 40 | #include <rdma/rdma_user_ioctl.h> |
38321256 MB |
41 | #include "uverbs.h" |
42 | #include "core_priv.h" | |
43 | #include "rdma_core.h" | |
44 | ||
45 | void uverbs_uobject_get(struct ib_uobject *uobject) | |
46 | { | |
47 | kref_get(&uobject->ref); | |
48 | } | |
49 | ||
30004b86 | 50 | static void uverbs_uobject_free(struct kref *ref) |
38321256 MB |
51 | { |
52 | struct ib_uobject *uobj = | |
53 | container_of(ref, struct ib_uobject, ref); | |
54 | ||
6b0d08f4 | 55 | if (uobj->uapi_object->type_class->needs_kfree_rcu) |
38321256 MB |
56 | kfree_rcu(uobj, rcu); |
57 | else | |
58 | kfree(uobj); | |
59 | } | |
60 | ||
61 | void uverbs_uobject_put(struct ib_uobject *uobject) | |
62 | { | |
30004b86 | 63 | kref_put(&uobject->ref, uverbs_uobject_free); |
38321256 MB |
64 | } |
65 | ||
9867f5c6 JG |
66 | static int uverbs_try_lock_object(struct ib_uobject *uobj, |
67 | enum rdma_lookup_mode mode) | |
38321256 MB |
68 | { |
69 | /* | |
30004b86 MB |
70 | * When a shared access is required, we use a positive counter. Each |
71 | * shared access request checks that the value != -1 and increment it. | |
72 | * Exclusive access is required for operations like write or destroy. | |
73 | * In exclusive access mode, we check that the counter is zero (nobody | |
74 | * claimed this object) and we set it to -1. Releasing a shared access | |
75 | * lock is done simply by decreasing the counter. As for exclusive | |
76 | * access locks, since only a single one of them is is allowed | |
77 | * concurrently, setting the counter to zero is enough for releasing | |
78 | * this lock. | |
38321256 | 79 | */ |
9867f5c6 JG |
80 | switch (mode) { |
81 | case UVERBS_LOOKUP_READ: | |
bfc18e38 | 82 | return atomic_fetch_add_unless(&uobj->usecnt, 1, -1) == -1 ? |
38321256 | 83 | -EBUSY : 0; |
9867f5c6 | 84 | case UVERBS_LOOKUP_WRITE: |
7452a3c7 | 85 | /* lock is exclusive */ |
9867f5c6 | 86 | return atomic_cmpxchg(&uobj->usecnt, 0, -1) == 0 ? 0 : -EBUSY; |
7452a3c7 JG |
87 | case UVERBS_LOOKUP_DESTROY: |
88 | return 0; | |
9867f5c6 JG |
89 | } |
90 | return 0; | |
38321256 MB |
91 | } |
92 | ||
9867f5c6 JG |
93 | static void assert_uverbs_usecnt(struct ib_uobject *uobj, |
94 | enum rdma_lookup_mode mode) | |
87ad80ab JG |
95 | { |
96 | #ifdef CONFIG_LOCKDEP | |
9867f5c6 JG |
97 | switch (mode) { |
98 | case UVERBS_LOOKUP_READ: | |
87ad80ab | 99 | WARN_ON(atomic_read(&uobj->usecnt) <= 0); |
9867f5c6 JG |
100 | break; |
101 | case UVERBS_LOOKUP_WRITE: | |
102 | WARN_ON(atomic_read(&uobj->usecnt) != -1); | |
103 | break; | |
7452a3c7 JG |
104 | case UVERBS_LOOKUP_DESTROY: |
105 | break; | |
9867f5c6 | 106 | } |
87ad80ab JG |
107 | #endif |
108 | } | |
109 | ||
110 | /* | |
1e857e65 JG |
111 | * This must be called with the hw_destroy_rwsem locked for read or write, |
112 | * also the uobject itself must be locked for write. | |
87ad80ab JG |
113 | * |
114 | * Upon return the HW object is guaranteed to be destroyed. | |
115 | * | |
116 | * For RDMA_REMOVE_ABORT, the hw_destroy_rwsem is not required to be held, | |
117 | * however the type's allocat_commit function cannot have been called and the | |
118 | * uobject cannot be on the uobjects_lists | |
119 | * | |
120 | * For RDMA_REMOVE_DESTROY the caller shold be holding a kref (eg via | |
121 | * rdma_lookup_get_uobject) and the object is left in a state where the caller | |
122 | * needs to call rdma_lookup_put_uobject. | |
123 | * | |
124 | * For all other destroy modes this function internally unlocks the uobject | |
125 | * and consumes the kref on the uobj. | |
126 | */ | |
127 | static int uverbs_destroy_uobject(struct ib_uobject *uobj, | |
128 | enum rdma_remove_reason reason) | |
129 | { | |
130 | struct ib_uverbs_file *ufile = uobj->ufile; | |
131 | unsigned long flags; | |
132 | int ret; | |
133 | ||
1e857e65 | 134 | lockdep_assert_held(&ufile->hw_destroy_rwsem); |
9867f5c6 | 135 | assert_uverbs_usecnt(uobj, UVERBS_LOOKUP_WRITE); |
87ad80ab JG |
136 | |
137 | if (uobj->object) { | |
6b0d08f4 | 138 | ret = uobj->uapi_object->type_class->destroy_hw(uobj, reason); |
87ad80ab JG |
139 | if (ret) { |
140 | if (ib_is_destroy_retryable(ret, reason, uobj)) | |
141 | return ret; | |
142 | ||
143 | /* Nothing to be done, dangle the memory and move on */ | |
144 | WARN(true, | |
145 | "ib_uverbs: failed to remove uobject id %d, driver err=%d", | |
146 | uobj->id, ret); | |
147 | } | |
148 | ||
149 | uobj->object = NULL; | |
150 | } | |
151 | ||
152 | if (reason == RDMA_REMOVE_ABORT) { | |
153 | WARN_ON(!list_empty(&uobj->list)); | |
154 | WARN_ON(!uobj->context); | |
6b0d08f4 | 155 | uobj->uapi_object->type_class->alloc_abort(uobj); |
87ad80ab JG |
156 | } |
157 | ||
158 | uobj->context = NULL; | |
159 | ||
160 | /* | |
161 | * For DESTROY the usecnt is held write locked, the caller is expected | |
0f50d88a JG |
162 | * to put it unlock and put the object when done with it. Only DESTROY |
163 | * can remove the IDR handle. | |
87ad80ab JG |
164 | */ |
165 | if (reason != RDMA_REMOVE_DESTROY) | |
166 | atomic_set(&uobj->usecnt, 0); | |
0f50d88a | 167 | else |
6b0d08f4 | 168 | uobj->uapi_object->type_class->remove_handle(uobj); |
87ad80ab JG |
169 | |
170 | if (!list_empty(&uobj->list)) { | |
171 | spin_lock_irqsave(&ufile->uobjects_lock, flags); | |
172 | list_del_init(&uobj->list); | |
173 | spin_unlock_irqrestore(&ufile->uobjects_lock, flags); | |
174 | ||
175 | /* | |
176 | * Pairs with the get in rdma_alloc_commit_uobject(), could | |
177 | * destroy uobj. | |
178 | */ | |
179 | uverbs_uobject_put(uobj); | |
180 | } | |
181 | ||
182 | /* | |
183 | * When aborting the stack kref remains owned by the core code, and is | |
184 | * not transferred into the type. Pairs with the get in alloc_uobj | |
185 | */ | |
186 | if (reason == RDMA_REMOVE_ABORT) | |
187 | uverbs_uobject_put(uobj); | |
188 | ||
189 | return 0; | |
190 | } | |
191 | ||
7452a3c7 JG |
192 | /* |
193 | * This calls uverbs_destroy_uobject() using the RDMA_REMOVE_DESTROY | |
194 | * sequence. It should only be used from command callbacks. On success the | |
195 | * caller must pair this with rdma_lookup_put_uobject(LOOKUP_WRITE). This | |
196 | * version requires the caller to have already obtained an | |
197 | * LOOKUP_DESTROY uobject kref. | |
198 | */ | |
199 | int uobj_destroy(struct ib_uobject *uobj) | |
200 | { | |
201 | struct ib_uverbs_file *ufile = uobj->ufile; | |
202 | int ret; | |
203 | ||
204 | down_read(&ufile->hw_destroy_rwsem); | |
205 | ||
206 | ret = uverbs_try_lock_object(uobj, UVERBS_LOOKUP_WRITE); | |
207 | if (ret) | |
208 | goto out_unlock; | |
209 | ||
210 | ret = uverbs_destroy_uobject(uobj, RDMA_REMOVE_DESTROY); | |
211 | if (ret) { | |
212 | atomic_set(&uobj->usecnt, 0); | |
213 | goto out_unlock; | |
214 | } | |
215 | ||
216 | out_unlock: | |
217 | up_read(&ufile->hw_destroy_rwsem); | |
218 | return ret; | |
219 | } | |
220 | ||
c33e73af | 221 | /* |
32ed5c00 JG |
222 | * uobj_get_destroy destroys the HW object and returns a handle to the uobj |
223 | * with a NULL object pointer. The caller must pair this with | |
224 | * uverbs_put_destroy. | |
c33e73af | 225 | */ |
6b0d08f4 | 226 | struct ib_uobject *__uobj_get_destroy(const struct uverbs_api_object *obj, |
8313c10f JG |
227 | u32 id, |
228 | const struct uverbs_attr_bundle *attrs) | |
c33e73af JG |
229 | { |
230 | struct ib_uobject *uobj; | |
231 | int ret; | |
232 | ||
8313c10f JG |
233 | uobj = rdma_lookup_get_uobject(obj, attrs->ufile, id, |
234 | UVERBS_LOOKUP_DESTROY); | |
c33e73af | 235 | if (IS_ERR(uobj)) |
32ed5c00 | 236 | return uobj; |
c33e73af | 237 | |
7452a3c7 | 238 | ret = uobj_destroy(uobj); |
32ed5c00 | 239 | if (ret) { |
7452a3c7 | 240 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_DESTROY); |
32ed5c00 JG |
241 | return ERR_PTR(ret); |
242 | } | |
c33e73af | 243 | |
32ed5c00 JG |
244 | return uobj; |
245 | } | |
246 | ||
247 | /* | |
7106a976 JG |
248 | * Does both uobj_get_destroy() and uobj_put_destroy(). Returns 0 on success |
249 | * (negative errno on failure). For use by callers that do not need the uobj. | |
32ed5c00 | 250 | */ |
6b0d08f4 | 251 | int __uobj_perform_destroy(const struct uverbs_api_object *obj, u32 id, |
7106a976 | 252 | const struct uverbs_attr_bundle *attrs) |
32ed5c00 JG |
253 | { |
254 | struct ib_uobject *uobj; | |
255 | ||
8313c10f | 256 | uobj = __uobj_get_destroy(obj, id, attrs); |
32ed5c00 JG |
257 | if (IS_ERR(uobj)) |
258 | return PTR_ERR(uobj); | |
259 | ||
9867f5c6 | 260 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_WRITE); |
7106a976 | 261 | return 0; |
c33e73af JG |
262 | } |
263 | ||
87ad80ab | 264 | /* alloc_uobj must be undone by uverbs_destroy_uobject() */ |
6ef1c828 | 265 | static struct ib_uobject *alloc_uobj(struct ib_uverbs_file *ufile, |
6b0d08f4 | 266 | const struct uverbs_api_object *obj) |
38321256 | 267 | { |
22fa27fb JG |
268 | struct ib_uobject *uobj; |
269 | struct ib_ucontext *ucontext; | |
270 | ||
8313c10f | 271 | ucontext = ib_uverbs_get_ucontext_file(ufile); |
22fa27fb JG |
272 | if (IS_ERR(ucontext)) |
273 | return ERR_CAST(ucontext); | |
38321256 | 274 | |
6b0d08f4 | 275 | uobj = kzalloc(obj->type_attrs->obj_size, GFP_KERNEL); |
38321256 MB |
276 | if (!uobj) |
277 | return ERR_PTR(-ENOMEM); | |
278 | /* | |
279 | * user_handle should be filled by the handler, | |
280 | * The object is added to the list in the commit stage. | |
281 | */ | |
6ef1c828 | 282 | uobj->ufile = ufile; |
22fa27fb | 283 | uobj->context = ucontext; |
5671f79b | 284 | INIT_LIST_HEAD(&uobj->list); |
6b0d08f4 | 285 | uobj->uapi_object = obj; |
d9dc7a35 JG |
286 | /* |
287 | * Allocated objects start out as write locked to deny any other | |
288 | * syscalls from accessing them until they are committed. See | |
289 | * rdma_alloc_commit_uobject | |
290 | */ | |
291 | atomic_set(&uobj->usecnt, -1); | |
38321256 MB |
292 | kref_init(&uobj->ref); |
293 | ||
294 | return uobj; | |
295 | } | |
296 | ||
297 | static int idr_add_uobj(struct ib_uobject *uobj) | |
298 | { | |
299 | int ret; | |
300 | ||
301 | idr_preload(GFP_KERNEL); | |
6f258884 | 302 | spin_lock(&uobj->ufile->idr_lock); |
38321256 MB |
303 | |
304 | /* | |
305 | * We start with allocating an idr pointing to NULL. This represents an | |
306 | * object which isn't initialized yet. We'll replace it later on with | |
307 | * the real object once we commit. | |
308 | */ | |
6f258884 | 309 | ret = idr_alloc(&uobj->ufile->idr, NULL, 0, |
38321256 MB |
310 | min_t(unsigned long, U32_MAX - 1, INT_MAX), GFP_NOWAIT); |
311 | if (ret >= 0) | |
312 | uobj->id = ret; | |
313 | ||
6f258884 | 314 | spin_unlock(&uobj->ufile->idr_lock); |
38321256 MB |
315 | idr_preload_end(); |
316 | ||
317 | return ret < 0 ? ret : 0; | |
318 | } | |
319 | ||
38321256 | 320 | /* Returns the ib_uobject or an error. The caller should check for IS_ERR. */ |
6ef1c828 | 321 | static struct ib_uobject * |
6b0d08f4 | 322 | lookup_get_idr_uobject(const struct uverbs_api_object *obj, |
9867f5c6 JG |
323 | struct ib_uverbs_file *ufile, s64 id, |
324 | enum rdma_lookup_mode mode) | |
38321256 MB |
325 | { |
326 | struct ib_uobject *uobj; | |
1250c304 JG |
327 | unsigned long idrno = id; |
328 | ||
329 | if (id < 0 || id > ULONG_MAX) | |
330 | return ERR_PTR(-EINVAL); | |
38321256 MB |
331 | |
332 | rcu_read_lock(); | |
333 | /* object won't be released as we're protected in rcu */ | |
1250c304 | 334 | uobj = idr_find(&ufile->idr, idrno); |
38321256 MB |
335 | if (!uobj) { |
336 | uobj = ERR_PTR(-ENOENT); | |
337 | goto free; | |
338 | } | |
339 | ||
6623e3e3 LR |
340 | /* |
341 | * The idr_find is guaranteed to return a pointer to something that | |
342 | * isn't freed yet, or NULL, as the free after idr_remove goes through | |
343 | * kfree_rcu(). However the object may still have been released and | |
344 | * kfree() could be called at any time. | |
345 | */ | |
346 | if (!kref_get_unless_zero(&uobj->ref)) | |
347 | uobj = ERR_PTR(-ENOENT); | |
348 | ||
38321256 MB |
349 | free: |
350 | rcu_read_unlock(); | |
351 | return uobj; | |
352 | } | |
353 | ||
9867f5c6 | 354 | static struct ib_uobject * |
6b0d08f4 | 355 | lookup_get_fd_uobject(const struct uverbs_api_object *obj, |
9867f5c6 JG |
356 | struct ib_uverbs_file *ufile, s64 id, |
357 | enum rdma_lookup_mode mode) | |
cf8966b3 | 358 | { |
6b0d08f4 | 359 | const struct uverbs_obj_fd_type *fd_type; |
cf8966b3 MB |
360 | struct file *f; |
361 | struct ib_uobject *uobject; | |
1250c304 | 362 | int fdno = id; |
cf8966b3 | 363 | |
1250c304 JG |
364 | if (fdno != id) |
365 | return ERR_PTR(-EINVAL); | |
366 | ||
9867f5c6 | 367 | if (mode != UVERBS_LOOKUP_READ) |
cf8966b3 MB |
368 | return ERR_PTR(-EOPNOTSUPP); |
369 | ||
6b0d08f4 JG |
370 | if (!obj->type_attrs) |
371 | return ERR_PTR(-EIO); | |
372 | fd_type = | |
373 | container_of(obj->type_attrs, struct uverbs_obj_fd_type, type); | |
374 | ||
1250c304 | 375 | f = fget(fdno); |
cf8966b3 MB |
376 | if (!f) |
377 | return ERR_PTR(-EBADF); | |
378 | ||
379 | uobject = f->private_data; | |
380 | /* | |
381 | * fget(id) ensures we are not currently running uverbs_close_fd, | |
382 | * and the caller is expected to ensure that uverbs_close_fd is never | |
383 | * done while a call top lookup is possible. | |
384 | */ | |
385 | if (f->f_op != fd_type->fops) { | |
386 | fput(f); | |
387 | return ERR_PTR(-EBADF); | |
388 | } | |
389 | ||
390 | uverbs_uobject_get(uobject); | |
391 | return uobject; | |
392 | } | |
393 | ||
6b0d08f4 | 394 | struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj, |
1250c304 | 395 | struct ib_uverbs_file *ufile, s64 id, |
9867f5c6 | 396 | enum rdma_lookup_mode mode) |
38321256 MB |
397 | { |
398 | struct ib_uobject *uobj; | |
399 | int ret; | |
400 | ||
4d7e8cc5 YH |
401 | if (IS_ERR(obj) && PTR_ERR(obj) == -ENOMSG) { |
402 | /* must be UVERBS_IDR_ANY_OBJECT, see uapi_get_object() */ | |
403 | uobj = lookup_get_idr_uobject(NULL, ufile, id, mode); | |
404 | if (IS_ERR(uobj)) | |
405 | return uobj; | |
406 | } else { | |
407 | if (IS_ERR(obj)) | |
408 | return ERR_PTR(-EINVAL); | |
409 | ||
410 | uobj = obj->type_class->lookup_get(obj, ufile, id, mode); | |
411 | if (IS_ERR(uobj)) | |
412 | return uobj; | |
413 | ||
414 | if (uobj->uapi_object != obj) { | |
415 | ret = -EINVAL; | |
416 | goto free; | |
417 | } | |
38321256 MB |
418 | } |
419 | ||
cc2e14e6 JG |
420 | /* |
421 | * If we have been disassociated block every command except for | |
422 | * DESTROY based commands. | |
423 | */ | |
424 | if (mode != UVERBS_LOOKUP_DESTROY && | |
425 | !srcu_dereference(ufile->device->ib_dev, | |
426 | &ufile->device->disassociate_srcu)) { | |
427 | ret = -EIO; | |
428 | goto free; | |
429 | } | |
430 | ||
9867f5c6 | 431 | ret = uverbs_try_lock_object(uobj, mode); |
e951747a | 432 | if (ret) |
38321256 | 433 | goto free; |
38321256 MB |
434 | |
435 | return uobj; | |
436 | free: | |
4d7e8cc5 | 437 | uobj->uapi_object->type_class->lookup_put(uobj, mode); |
38321256 MB |
438 | uverbs_uobject_put(uobj); |
439 | return ERR_PTR(ret); | |
440 | } | |
3d9dfd06 SR |
441 | struct ib_uobject *_uobj_get_read(enum uverbs_default_objects type, |
442 | u32 object_id, | |
443 | struct uverbs_attr_bundle *attrs) | |
444 | { | |
445 | struct ib_uobject *uobj; | |
446 | ||
447 | uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile, | |
448 | object_id, UVERBS_LOOKUP_READ); | |
449 | if (IS_ERR(uobj)) | |
450 | return uobj; | |
451 | ||
452 | attrs->context = uobj->context; | |
453 | ||
454 | return uobj; | |
455 | } | |
456 | ||
457 | struct ib_uobject *_uobj_get_write(enum uverbs_default_objects type, | |
458 | u32 object_id, | |
459 | struct uverbs_attr_bundle *attrs) | |
460 | { | |
461 | struct ib_uobject *uobj; | |
462 | ||
463 | uobj = rdma_lookup_get_uobject(uobj_get_type(attrs, type), attrs->ufile, | |
464 | object_id, UVERBS_LOOKUP_WRITE); | |
465 | ||
466 | if (IS_ERR(uobj)) | |
467 | return uobj; | |
468 | ||
469 | attrs->context = uobj->context; | |
470 | ||
471 | return uobj; | |
472 | } | |
38321256 | 473 | |
6b0d08f4 JG |
474 | static struct ib_uobject * |
475 | alloc_begin_idr_uobject(const struct uverbs_api_object *obj, | |
476 | struct ib_uverbs_file *ufile) | |
38321256 MB |
477 | { |
478 | int ret; | |
479 | struct ib_uobject *uobj; | |
480 | ||
6b0d08f4 | 481 | uobj = alloc_uobj(ufile, obj); |
38321256 MB |
482 | if (IS_ERR(uobj)) |
483 | return uobj; | |
484 | ||
485 | ret = idr_add_uobj(uobj); | |
486 | if (ret) | |
487 | goto uobj_put; | |
488 | ||
22fa27fb | 489 | ret = ib_rdmacg_try_charge(&uobj->cg_obj, uobj->context->device, |
38321256 MB |
490 | RDMACG_RESOURCE_HCA_OBJECT); |
491 | if (ret) | |
492 | goto idr_remove; | |
493 | ||
494 | return uobj; | |
495 | ||
496 | idr_remove: | |
5671f79b JG |
497 | spin_lock(&ufile->idr_lock); |
498 | idr_remove(&ufile->idr, uobj->id); | |
499 | spin_unlock(&ufile->idr_lock); | |
38321256 MB |
500 | uobj_put: |
501 | uverbs_uobject_put(uobj); | |
502 | return ERR_PTR(ret); | |
503 | } | |
504 | ||
6b0d08f4 JG |
505 | static struct ib_uobject * |
506 | alloc_begin_fd_uobject(const struct uverbs_api_object *obj, | |
507 | struct ib_uverbs_file *ufile) | |
cf8966b3 | 508 | { |
cf8966b3 MB |
509 | int new_fd; |
510 | struct ib_uobject *uobj; | |
cf8966b3 MB |
511 | |
512 | new_fd = get_unused_fd_flags(O_CLOEXEC); | |
513 | if (new_fd < 0) | |
514 | return ERR_PTR(new_fd); | |
515 | ||
6b0d08f4 | 516 | uobj = alloc_uobj(ufile, obj); |
cf8966b3 MB |
517 | if (IS_ERR(uobj)) { |
518 | put_unused_fd(new_fd); | |
519 | return uobj; | |
520 | } | |
521 | ||
d0259e82 | 522 | uobj->id = new_fd; |
d0259e82 | 523 | uobj->ufile = ufile; |
cf8966b3 MB |
524 | |
525 | return uobj; | |
526 | } | |
527 | ||
6b0d08f4 | 528 | struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj, |
6ef1c828 | 529 | struct ib_uverbs_file *ufile) |
38321256 | 530 | { |
1e857e65 JG |
531 | struct ib_uobject *ret; |
532 | ||
4d7e8cc5 | 533 | if (IS_ERR(obj)) |
6b0d08f4 JG |
534 | return ERR_PTR(-EINVAL); |
535 | ||
1e857e65 JG |
536 | /* |
537 | * The hw_destroy_rwsem is held across the entire object creation and | |
538 | * released during rdma_alloc_commit_uobject or | |
539 | * rdma_alloc_abort_uobject | |
540 | */ | |
541 | if (!down_read_trylock(&ufile->hw_destroy_rwsem)) | |
542 | return ERR_PTR(-EIO); | |
543 | ||
6b0d08f4 | 544 | ret = obj->type_class->alloc_begin(obj, ufile); |
1e857e65 JG |
545 | if (IS_ERR(ret)) { |
546 | up_read(&ufile->hw_destroy_rwsem); | |
547 | return ret; | |
548 | } | |
549 | return ret; | |
38321256 MB |
550 | } |
551 | ||
87ad80ab JG |
552 | static void alloc_abort_idr_uobject(struct ib_uobject *uobj) |
553 | { | |
554 | ib_rdmacg_uncharge(&uobj->cg_obj, uobj->context->device, | |
555 | RDMACG_RESOURCE_HCA_OBJECT); | |
556 | ||
557 | spin_lock(&uobj->ufile->idr_lock); | |
558 | idr_remove(&uobj->ufile->idr, uobj->id); | |
559 | spin_unlock(&uobj->ufile->idr_lock); | |
560 | } | |
561 | ||
0f50d88a JG |
562 | static int __must_check destroy_hw_idr_uobject(struct ib_uobject *uobj, |
563 | enum rdma_remove_reason why) | |
38321256 MB |
564 | { |
565 | const struct uverbs_obj_idr_type *idr_type = | |
6b0d08f4 JG |
566 | container_of(uobj->uapi_object->type_attrs, |
567 | struct uverbs_obj_idr_type, type); | |
38321256 MB |
568 | int ret = idr_type->destroy_object(uobj, why); |
569 | ||
570 | /* | |
571 | * We can only fail gracefully if the user requested to destroy the | |
1c77483e YH |
572 | * object or when a retry may be called upon an error. |
573 | * In the rest of the cases, just remove whatever you can. | |
38321256 | 574 | */ |
1c77483e | 575 | if (ib_is_destroy_retryable(ret, why, uobj)) |
38321256 MB |
576 | return ret; |
577 | ||
87ad80ab JG |
578 | if (why == RDMA_REMOVE_ABORT) |
579 | return 0; | |
5671f79b | 580 | |
0f50d88a JG |
581 | ib_rdmacg_uncharge(&uobj->cg_obj, uobj->context->device, |
582 | RDMACG_RESOURCE_HCA_OBJECT); | |
38321256 | 583 | |
87ad80ab | 584 | return 0; |
38321256 MB |
585 | } |
586 | ||
0f50d88a JG |
587 | static void remove_handle_idr_uobject(struct ib_uobject *uobj) |
588 | { | |
589 | spin_lock(&uobj->ufile->idr_lock); | |
590 | idr_remove(&uobj->ufile->idr, uobj->id); | |
591 | spin_unlock(&uobj->ufile->idr_lock); | |
592 | /* Matches the kref in alloc_commit_idr_uobject */ | |
593 | uverbs_uobject_put(uobj); | |
594 | } | |
595 | ||
cf8966b3 MB |
596 | static void alloc_abort_fd_uobject(struct ib_uobject *uobj) |
597 | { | |
aba94548 | 598 | put_unused_fd(uobj->id); |
cf8966b3 MB |
599 | } |
600 | ||
0f50d88a JG |
601 | static int __must_check destroy_hw_fd_uobject(struct ib_uobject *uobj, |
602 | enum rdma_remove_reason why) | |
cf8966b3 | 603 | { |
6b0d08f4 JG |
604 | const struct uverbs_obj_fd_type *fd_type = container_of( |
605 | uobj->uapi_object->type_attrs, struct uverbs_obj_fd_type, type); | |
d0259e82 | 606 | int ret = fd_type->context_closed(uobj, why); |
cf8966b3 | 607 | |
1c77483e | 608 | if (ib_is_destroy_retryable(ret, why, uobj)) |
cf8966b3 MB |
609 | return ret; |
610 | ||
87ad80ab | 611 | return 0; |
38321256 MB |
612 | } |
613 | ||
0f50d88a JG |
614 | static void remove_handle_fd_uobject(struct ib_uobject *uobj) |
615 | { | |
616 | } | |
617 | ||
aba94548 | 618 | static int alloc_commit_idr_uobject(struct ib_uobject *uobj) |
38321256 | 619 | { |
c561c288 JG |
620 | struct ib_uverbs_file *ufile = uobj->ufile; |
621 | ||
622 | spin_lock(&ufile->idr_lock); | |
38321256 MB |
623 | /* |
624 | * We already allocated this IDR with a NULL object, so | |
625 | * this shouldn't fail. | |
c561c288 JG |
626 | * |
627 | * NOTE: Once we set the IDR we loose ownership of our kref on uobj. | |
628 | * It will be put by remove_commit_idr_uobject() | |
38321256 | 629 | */ |
c561c288 JG |
630 | WARN_ON(idr_replace(&ufile->idr, uobj, uobj->id)); |
631 | spin_unlock(&ufile->idr_lock); | |
aba94548 JG |
632 | |
633 | return 0; | |
38321256 MB |
634 | } |
635 | ||
aba94548 | 636 | static int alloc_commit_fd_uobject(struct ib_uobject *uobj) |
cf8966b3 | 637 | { |
6b0d08f4 JG |
638 | const struct uverbs_obj_fd_type *fd_type = container_of( |
639 | uobj->uapi_object->type_attrs, struct uverbs_obj_fd_type, type); | |
c561c288 | 640 | int fd = uobj->id; |
aba94548 JG |
641 | struct file *filp; |
642 | ||
643 | /* | |
644 | * The kref for uobj is moved into filp->private data and put in | |
645 | * uverbs_close_fd(). Once alloc_commit() succeeds uverbs_close_fd() | |
646 | * must be guaranteed to be called from the provided fops release | |
647 | * callback. | |
648 | */ | |
649 | filp = anon_inode_getfile(fd_type->name, | |
650 | fd_type->fops, | |
651 | uobj, | |
652 | fd_type->flags); | |
653 | if (IS_ERR(filp)) | |
654 | return PTR_ERR(filp); | |
655 | ||
656 | uobj->object = filp; | |
657 | ||
658 | /* Matching put will be done in uverbs_close_fd() */ | |
659 | kref_get(&uobj->ufile->ref); | |
c561c288 | 660 | |
cf8966b3 | 661 | /* This shouldn't be used anymore. Use the file object instead */ |
d0259e82 | 662 | uobj->id = 0; |
c561c288 | 663 | |
c561c288 JG |
664 | /* |
665 | * NOTE: Once we install the file we loose ownership of our kref on | |
666 | * uobj. It will be put by uverbs_close_fd() | |
667 | */ | |
aba94548 JG |
668 | fd_install(fd, filp); |
669 | ||
670 | return 0; | |
cf8966b3 MB |
671 | } |
672 | ||
c561c288 JG |
673 | /* |
674 | * In all cases rdma_alloc_commit_uobject() consumes the kref to uobj and the | |
2c96eb7d JG |
675 | * caller can no longer assume uobj is valid. If this function fails it |
676 | * destroys the uboject, including the attached HW object. | |
c561c288 | 677 | */ |
2c96eb7d | 678 | int __must_check rdma_alloc_commit_uobject(struct ib_uobject *uobj) |
38321256 | 679 | { |
6a5e9c88 | 680 | struct ib_uverbs_file *ufile = uobj->ufile; |
aba94548 | 681 | int ret; |
6a5e9c88 | 682 | |
aba94548 | 683 | /* alloc_commit consumes the uobj kref */ |
6b0d08f4 | 684 | ret = uobj->uapi_object->type_class->alloc_commit(uobj); |
aba94548 | 685 | if (ret) { |
87ad80ab | 686 | uverbs_destroy_uobject(uobj, RDMA_REMOVE_ABORT); |
1e857e65 | 687 | up_read(&ufile->hw_destroy_rwsem); |
aba94548 JG |
688 | return ret; |
689 | } | |
d9dc7a35 | 690 | |
5671f79b JG |
691 | /* kref is held so long as the uobj is on the uobj list. */ |
692 | uverbs_uobject_get(uobj); | |
87064277 | 693 | spin_lock_irq(&ufile->uobjects_lock); |
6a5e9c88 | 694 | list_add(&uobj->list, &ufile->uobjects); |
87064277 | 695 | spin_unlock_irq(&ufile->uobjects_lock); |
8efe991e | 696 | |
aba94548 JG |
697 | /* matches atomic_set(-1) in alloc_uobj */ |
698 | atomic_set(&uobj->usecnt, 0); | |
699 | ||
1e857e65 | 700 | /* Matches the down_read in rdma_alloc_begin_uobject */ |
87064277 | 701 | up_read(&ufile->hw_destroy_rwsem); |
38321256 MB |
702 | |
703 | return 0; | |
704 | } | |
705 | ||
5671f79b JG |
706 | /* |
707 | * This consumes the kref for uobj. It is up to the caller to unwind the HW | |
708 | * object and anything else connected to uobj before calling this. | |
709 | */ | |
38321256 MB |
710 | void rdma_alloc_abort_uobject(struct ib_uobject *uobj) |
711 | { | |
1e857e65 JG |
712 | struct ib_uverbs_file *ufile = uobj->ufile; |
713 | ||
87ad80ab JG |
714 | uobj->object = NULL; |
715 | uverbs_destroy_uobject(uobj, RDMA_REMOVE_ABORT); | |
1e857e65 JG |
716 | |
717 | /* Matches the down_read in rdma_alloc_begin_uobject */ | |
718 | up_read(&ufile->hw_destroy_rwsem); | |
38321256 MB |
719 | } |
720 | ||
9867f5c6 JG |
721 | static void lookup_put_idr_uobject(struct ib_uobject *uobj, |
722 | enum rdma_lookup_mode mode) | |
38321256 MB |
723 | { |
724 | } | |
725 | ||
9867f5c6 JG |
726 | static void lookup_put_fd_uobject(struct ib_uobject *uobj, |
727 | enum rdma_lookup_mode mode) | |
cf8966b3 MB |
728 | { |
729 | struct file *filp = uobj->object; | |
730 | ||
9867f5c6 | 731 | WARN_ON(mode != UVERBS_LOOKUP_READ); |
cf8966b3 MB |
732 | /* This indirectly calls uverbs_close_fd and free the object */ |
733 | fput(filp); | |
734 | } | |
735 | ||
9867f5c6 JG |
736 | void rdma_lookup_put_uobject(struct ib_uobject *uobj, |
737 | enum rdma_lookup_mode mode) | |
38321256 | 738 | { |
9867f5c6 | 739 | assert_uverbs_usecnt(uobj, mode); |
6b0d08f4 | 740 | uobj->uapi_object->type_class->lookup_put(uobj, mode); |
38321256 MB |
741 | /* |
742 | * In order to unlock an object, either decrease its usecnt for | |
30004b86 | 743 | * read access or zero it in case of exclusive access. See |
38321256 MB |
744 | * uverbs_try_lock_object for locking schema information. |
745 | */ | |
9867f5c6 JG |
746 | switch (mode) { |
747 | case UVERBS_LOOKUP_READ: | |
38321256 | 748 | atomic_dec(&uobj->usecnt); |
9867f5c6 JG |
749 | break; |
750 | case UVERBS_LOOKUP_WRITE: | |
38321256 | 751 | atomic_set(&uobj->usecnt, 0); |
9867f5c6 | 752 | break; |
7452a3c7 JG |
753 | case UVERBS_LOOKUP_DESTROY: |
754 | break; | |
9867f5c6 | 755 | } |
38321256 | 756 | |
5671f79b | 757 | /* Pairs with the kref obtained by type->lookup_get */ |
38321256 MB |
758 | uverbs_uobject_put(uobj); |
759 | } | |
760 | ||
0f50d88a JG |
761 | void setup_ufile_idr_uobject(struct ib_uverbs_file *ufile) |
762 | { | |
763 | spin_lock_init(&ufile->idr_lock); | |
764 | idr_init(&ufile->idr); | |
765 | } | |
766 | ||
767 | void release_ufile_idr_uobject(struct ib_uverbs_file *ufile) | |
768 | { | |
769 | struct ib_uobject *entry; | |
770 | int id; | |
771 | ||
772 | /* | |
773 | * At this point uverbs_cleanup_ufile() is guaranteed to have run, and | |
774 | * there are no HW objects left, however the IDR is still populated | |
775 | * with anything that has not been cleaned up by userspace. Since the | |
776 | * kref on ufile is 0, nothing is allowed to call lookup_get. | |
777 | * | |
778 | * This is an optimized equivalent to remove_handle_idr_uobject | |
779 | */ | |
780 | idr_for_each_entry(&ufile->idr, entry, id) { | |
781 | WARN_ON(entry->object); | |
782 | uverbs_uobject_put(entry); | |
783 | } | |
784 | ||
785 | idr_destroy(&ufile->idr); | |
786 | } | |
787 | ||
38321256 MB |
788 | const struct uverbs_obj_type_class uverbs_idr_class = { |
789 | .alloc_begin = alloc_begin_idr_uobject, | |
790 | .lookup_get = lookup_get_idr_uobject, | |
791 | .alloc_commit = alloc_commit_idr_uobject, | |
792 | .alloc_abort = alloc_abort_idr_uobject, | |
793 | .lookup_put = lookup_put_idr_uobject, | |
0f50d88a JG |
794 | .destroy_hw = destroy_hw_idr_uobject, |
795 | .remove_handle = remove_handle_idr_uobject, | |
38321256 MB |
796 | /* |
797 | * When we destroy an object, we first just lock it for WRITE and | |
798 | * actually DESTROY it in the finalize stage. So, the problematic | |
799 | * scenario is when we just started the finalize stage of the | |
800 | * destruction (nothing was executed yet). Now, the other thread | |
801 | * fetched the object for READ access, but it didn't lock it yet. | |
802 | * The DESTROY thread continues and starts destroying the object. | |
803 | * When the other thread continue - without the RCU, it would | |
804 | * access freed memory. However, the rcu_read_lock delays the free | |
805 | * until the rcu_read_lock of the READ operation quits. Since the | |
30004b86 | 806 | * exclusive lock of the object is still taken by the DESTROY flow, the |
38321256 MB |
807 | * READ operation will get -EBUSY and it'll just bail out. |
808 | */ | |
809 | .needs_kfree_rcu = true, | |
810 | }; | |
1114b0a8 | 811 | EXPORT_SYMBOL(uverbs_idr_class); |
38321256 | 812 | |
cf8966b3 MB |
813 | void uverbs_close_fd(struct file *f) |
814 | { | |
d0259e82 | 815 | struct ib_uobject *uobj = f->private_data; |
e6d5d5dd JG |
816 | struct ib_uverbs_file *ufile = uobj->ufile; |
817 | ||
87064277 | 818 | if (down_read_trylock(&ufile->hw_destroy_rwsem)) { |
87ad80ab JG |
819 | /* |
820 | * lookup_get_fd_uobject holds the kref on the struct file any | |
821 | * time a FD uobj is locked, which prevents this release | |
822 | * method from being invoked. Meaning we can always get the | |
823 | * write lock here, or we have a kernel bug. | |
824 | */ | |
9867f5c6 | 825 | WARN_ON(uverbs_try_lock_object(uobj, UVERBS_LOOKUP_WRITE)); |
87ad80ab | 826 | uverbs_destroy_uobject(uobj, RDMA_REMOVE_CLOSE); |
87064277 | 827 | up_read(&ufile->hw_destroy_rwsem); |
e6d5d5dd JG |
828 | } |
829 | ||
e6d5d5dd JG |
830 | /* Matches the get in alloc_begin_fd_uobject */ |
831 | kref_put(&ufile->ref, ib_uverbs_release_file); | |
cf8966b3 | 832 | |
5671f79b | 833 | /* Pairs with filp->private_data in alloc_begin_fd_uobject */ |
d0259e82 | 834 | uverbs_uobject_put(uobj); |
cf8966b3 | 835 | } |
6bf8f22a | 836 | EXPORT_SYMBOL(uverbs_close_fd); |
cf8966b3 | 837 | |
e951747a JG |
838 | /* |
839 | * Drop the ucontext off the ufile and completely disconnect it from the | |
840 | * ib_device | |
841 | */ | |
842 | static void ufile_destroy_ucontext(struct ib_uverbs_file *ufile, | |
843 | enum rdma_remove_reason reason) | |
844 | { | |
845 | struct ib_ucontext *ucontext = ufile->ucontext; | |
ce92db1c | 846 | struct ib_device *ib_dev = ucontext->device; |
e951747a | 847 | |
ce92db1c JG |
848 | /* |
849 | * If we are closing the FD then the user mmap VMAs must have | |
850 | * already been destroyed as they hold on to the filep, otherwise | |
851 | * they need to be zap'd. | |
852 | */ | |
5f9794dc JG |
853 | if (reason == RDMA_REMOVE_DRIVER_REMOVE) { |
854 | uverbs_user_mmap_disassociate(ufile); | |
3023a1e9 KH |
855 | if (ib_dev->ops.disassociate_ucontext) |
856 | ib_dev->ops.disassociate_ucontext(ucontext); | |
5f9794dc | 857 | } |
e951747a | 858 | |
ce92db1c | 859 | ib_rdmacg_uncharge(&ucontext->cg_obj, ib_dev, |
e951747a JG |
860 | RDMACG_RESOURCE_HCA_HANDLE); |
861 | ||
12d23a91 LR |
862 | rdma_restrack_del(&ucontext->res); |
863 | ||
a2a074ef LR |
864 | ib_dev->ops.dealloc_ucontext(ucontext); |
865 | kfree(ucontext); | |
e951747a JG |
866 | |
867 | ufile->ucontext = NULL; | |
868 | } | |
869 | ||
6ef1c828 JG |
870 | static int __uverbs_cleanup_ufile(struct ib_uverbs_file *ufile, |
871 | enum rdma_remove_reason reason) | |
38321256 | 872 | { |
1c77483e YH |
873 | struct ib_uobject *obj, *next_obj; |
874 | int ret = -EINVAL; | |
38321256 | 875 | |
1c77483e YH |
876 | /* |
877 | * This shouldn't run while executing other commands on this | |
878 | * context. Thus, the only thing we should take care of is | |
879 | * releasing a FD while traversing this list. The FD could be | |
880 | * closed and released from the _release fop of this FD. | |
881 | * In order to mitigate this, we add a lock. | |
882 | * We take and release the lock per traversal in order to let | |
883 | * other threads (which might still use the FDs) chance to run. | |
884 | */ | |
6a5e9c88 | 885 | list_for_each_entry_safe(obj, next_obj, &ufile->uobjects, list) { |
1c77483e YH |
886 | /* |
887 | * if we hit this WARN_ON, that means we are | |
888 | * racing with a lookup_get. | |
889 | */ | |
9867f5c6 | 890 | WARN_ON(uverbs_try_lock_object(obj, UVERBS_LOOKUP_WRITE)); |
87ad80ab JG |
891 | if (!uverbs_destroy_uobject(obj, reason)) |
892 | ret = 0; | |
e4ff3d22 AK |
893 | else |
894 | atomic_set(&obj->usecnt, 0); | |
1c77483e | 895 | } |
1c77483e YH |
896 | return ret; |
897 | } | |
898 | ||
e951747a JG |
899 | /* |
900 | * Destroy the uncontext and every uobject associated with it. If called with | |
901 | * reason != RDMA_REMOVE_CLOSE this will not return until the destruction has | |
902 | * been completed and ufile->ucontext is NULL. | |
903 | * | |
904 | * This is internally locked and can be called in parallel from multiple | |
905 | * contexts. | |
906 | */ | |
907 | void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile, | |
908 | enum rdma_remove_reason reason) | |
1c77483e | 909 | { |
e951747a JG |
910 | if (reason == RDMA_REMOVE_CLOSE) { |
911 | /* | |
912 | * During destruction we might trigger something that | |
913 | * synchronously calls release on any file descriptor. For | |
914 | * this reason all paths that come from file_operations | |
915 | * release must use try_lock. They can progress knowing that | |
916 | * there is an ongoing uverbs_destroy_ufile_hw that will clean | |
917 | * up the driver resources. | |
918 | */ | |
919 | if (!mutex_trylock(&ufile->ucontext_lock)) | |
920 | return; | |
921 | ||
922 | } else { | |
923 | mutex_lock(&ufile->ucontext_lock); | |
924 | } | |
925 | ||
926 | down_write(&ufile->hw_destroy_rwsem); | |
6a5e9c88 | 927 | |
38321256 | 928 | /* |
e951747a JG |
929 | * If a ucontext was never created then we can't have any uobjects to |
930 | * cleanup, nothing to do. | |
38321256 | 931 | */ |
e951747a JG |
932 | if (!ufile->ucontext) |
933 | goto done; | |
934 | ||
935 | ufile->ucontext->closing = true; | |
6a5e9c88 JG |
936 | ufile->ucontext->cleanup_retryable = true; |
937 | while (!list_empty(&ufile->uobjects)) | |
6ef1c828 | 938 | if (__uverbs_cleanup_ufile(ufile, reason)) { |
1c77483e YH |
939 | /* |
940 | * No entry was cleaned-up successfully during this | |
941 | * iteration | |
942 | */ | |
943 | break; | |
944 | } | |
38321256 | 945 | |
6a5e9c88 JG |
946 | ufile->ucontext->cleanup_retryable = false; |
947 | if (!list_empty(&ufile->uobjects)) | |
6ef1c828 | 948 | __uverbs_cleanup_ufile(ufile, reason); |
38321256 | 949 | |
e951747a JG |
950 | ufile_destroy_ucontext(ufile, reason); |
951 | ||
952 | done: | |
87064277 | 953 | up_write(&ufile->hw_destroy_rwsem); |
e951747a | 954 | mutex_unlock(&ufile->ucontext_lock); |
38321256 MB |
955 | } |
956 | ||
cf8966b3 MB |
957 | const struct uverbs_obj_type_class uverbs_fd_class = { |
958 | .alloc_begin = alloc_begin_fd_uobject, | |
959 | .lookup_get = lookup_get_fd_uobject, | |
960 | .alloc_commit = alloc_commit_fd_uobject, | |
961 | .alloc_abort = alloc_abort_fd_uobject, | |
962 | .lookup_put = lookup_put_fd_uobject, | |
0f50d88a JG |
963 | .destroy_hw = destroy_hw_fd_uobject, |
964 | .remove_handle = remove_handle_fd_uobject, | |
cf8966b3 MB |
965 | .needs_kfree_rcu = false, |
966 | }; | |
1114b0a8 | 967 | EXPORT_SYMBOL(uverbs_fd_class); |
cf8966b3 | 968 | |
6ef1c828 | 969 | struct ib_uobject * |
6b0d08f4 | 970 | uverbs_get_uobject_from_file(u16 object_id, |
6ef1c828 | 971 | struct ib_uverbs_file *ufile, |
1250c304 | 972 | enum uverbs_obj_access access, s64 id) |
a0aa309c | 973 | { |
6b0d08f4 JG |
974 | const struct uverbs_api_object *obj = |
975 | uapi_get_object(ufile->device->uapi, object_id); | |
976 | ||
a0aa309c MB |
977 | switch (access) { |
978 | case UVERBS_ACCESS_READ: | |
6b0d08f4 | 979 | return rdma_lookup_get_uobject(obj, ufile, id, |
9867f5c6 | 980 | UVERBS_LOOKUP_READ); |
a0aa309c | 981 | case UVERBS_ACCESS_DESTROY: |
7452a3c7 | 982 | /* Actual destruction is done inside uverbs_handle_method */ |
6b0d08f4 | 983 | return rdma_lookup_get_uobject(obj, ufile, id, |
7452a3c7 | 984 | UVERBS_LOOKUP_DESTROY); |
a0aa309c | 985 | case UVERBS_ACCESS_WRITE: |
6b0d08f4 | 986 | return rdma_lookup_get_uobject(obj, ufile, id, |
9867f5c6 | 987 | UVERBS_LOOKUP_WRITE); |
a0aa309c | 988 | case UVERBS_ACCESS_NEW: |
6b0d08f4 | 989 | return rdma_alloc_begin_uobject(obj, ufile); |
a0aa309c MB |
990 | default: |
991 | WARN_ON(true); | |
992 | return ERR_PTR(-EOPNOTSUPP); | |
993 | } | |
994 | } | |
995 | ||
996 | int uverbs_finalize_object(struct ib_uobject *uobj, | |
997 | enum uverbs_obj_access access, | |
998 | bool commit) | |
999 | { | |
1000 | int ret = 0; | |
1001 | ||
1002 | /* | |
1003 | * refcounts should be handled at the object level and not at the | |
1004 | * uobject level. Refcounts of the objects themselves are done in | |
1005 | * handlers. | |
1006 | */ | |
1007 | ||
1008 | switch (access) { | |
1009 | case UVERBS_ACCESS_READ: | |
9867f5c6 | 1010 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_READ); |
a0aa309c MB |
1011 | break; |
1012 | case UVERBS_ACCESS_WRITE: | |
9867f5c6 | 1013 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_WRITE); |
a0aa309c MB |
1014 | break; |
1015 | case UVERBS_ACCESS_DESTROY: | |
7452a3c7 JG |
1016 | if (uobj) |
1017 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_DESTROY); | |
a0aa309c MB |
1018 | break; |
1019 | case UVERBS_ACCESS_NEW: | |
1020 | if (commit) | |
1021 | ret = rdma_alloc_commit_uobject(uobj); | |
1022 | else | |
1023 | rdma_alloc_abort_uobject(uobj); | |
1024 | break; | |
1025 | default: | |
1026 | WARN_ON(true); | |
1027 | ret = -EOPNOTSUPP; | |
1028 | } | |
1029 | ||
1030 | return ret; | |
1031 | } |