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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 | ||
30004b86 | 45 | static void uverbs_uobject_free(struct kref *ref) |
38321256 | 46 | { |
8bdf9dd9 | 47 | kfree_rcu(container_of(ref, struct ib_uobject, ref), rcu); |
38321256 MB |
48 | } |
49 | ||
6898d1c6 JG |
50 | /* |
51 | * In order to indicate we no longer needs this uobject, uverbs_uobject_put | |
52 | * is called. When the reference count is decreased, the uobject is freed. | |
53 | * For example, this is used when attaching a completion channel to a CQ. | |
54 | */ | |
38321256 MB |
55 | void uverbs_uobject_put(struct ib_uobject *uobject) |
56 | { | |
30004b86 | 57 | kref_put(&uobject->ref, uverbs_uobject_free); |
38321256 | 58 | } |
6898d1c6 | 59 | EXPORT_SYMBOL(uverbs_uobject_put); |
38321256 | 60 | |
9867f5c6 JG |
61 | static int uverbs_try_lock_object(struct ib_uobject *uobj, |
62 | enum rdma_lookup_mode mode) | |
38321256 MB |
63 | { |
64 | /* | |
30004b86 MB |
65 | * When a shared access is required, we use a positive counter. Each |
66 | * shared access request checks that the value != -1 and increment it. | |
67 | * Exclusive access is required for operations like write or destroy. | |
68 | * In exclusive access mode, we check that the counter is zero (nobody | |
69 | * claimed this object) and we set it to -1. Releasing a shared access | |
70 | * lock is done simply by decreasing the counter. As for exclusive | |
fd46ef3d | 71 | * access locks, since only a single one of them is allowed |
30004b86 MB |
72 | * concurrently, setting the counter to zero is enough for releasing |
73 | * this lock. | |
38321256 | 74 | */ |
9867f5c6 JG |
75 | switch (mode) { |
76 | case UVERBS_LOOKUP_READ: | |
bfc18e38 | 77 | return atomic_fetch_add_unless(&uobj->usecnt, 1, -1) == -1 ? |
38321256 | 78 | -EBUSY : 0; |
9867f5c6 | 79 | case UVERBS_LOOKUP_WRITE: |
7452a3c7 | 80 | /* lock is exclusive */ |
9867f5c6 | 81 | return atomic_cmpxchg(&uobj->usecnt, 0, -1) == 0 ? 0 : -EBUSY; |
7452a3c7 JG |
82 | case UVERBS_LOOKUP_DESTROY: |
83 | return 0; | |
9867f5c6 JG |
84 | } |
85 | return 0; | |
38321256 MB |
86 | } |
87 | ||
9867f5c6 JG |
88 | static void assert_uverbs_usecnt(struct ib_uobject *uobj, |
89 | enum rdma_lookup_mode mode) | |
87ad80ab JG |
90 | { |
91 | #ifdef CONFIG_LOCKDEP | |
9867f5c6 JG |
92 | switch (mode) { |
93 | case UVERBS_LOOKUP_READ: | |
87ad80ab | 94 | WARN_ON(atomic_read(&uobj->usecnt) <= 0); |
9867f5c6 JG |
95 | break; |
96 | case UVERBS_LOOKUP_WRITE: | |
97 | WARN_ON(atomic_read(&uobj->usecnt) != -1); | |
98 | break; | |
7452a3c7 JG |
99 | case UVERBS_LOOKUP_DESTROY: |
100 | break; | |
9867f5c6 | 101 | } |
87ad80ab JG |
102 | #endif |
103 | } | |
104 | ||
105 | /* | |
1e857e65 JG |
106 | * This must be called with the hw_destroy_rwsem locked for read or write, |
107 | * also the uobject itself must be locked for write. | |
87ad80ab JG |
108 | * |
109 | * Upon return the HW object is guaranteed to be destroyed. | |
110 | * | |
111 | * For RDMA_REMOVE_ABORT, the hw_destroy_rwsem is not required to be held, | |
112 | * however the type's allocat_commit function cannot have been called and the | |
113 | * uobject cannot be on the uobjects_lists | |
114 | * | |
016b26af | 115 | * For RDMA_REMOVE_DESTROY the caller should be holding a kref (eg via |
87ad80ab JG |
116 | * rdma_lookup_get_uobject) and the object is left in a state where the caller |
117 | * needs to call rdma_lookup_put_uobject. | |
118 | * | |
119 | * For all other destroy modes this function internally unlocks the uobject | |
120 | * and consumes the kref on the uobj. | |
121 | */ | |
122 | static int uverbs_destroy_uobject(struct ib_uobject *uobj, | |
a6a3797d SR |
123 | enum rdma_remove_reason reason, |
124 | struct uverbs_attr_bundle *attrs) | |
87ad80ab | 125 | { |
feec576a | 126 | struct ib_uverbs_file *ufile = attrs->ufile; |
87ad80ab JG |
127 | unsigned long flags; |
128 | int ret; | |
129 | ||
1e857e65 | 130 | lockdep_assert_held(&ufile->hw_destroy_rwsem); |
9867f5c6 | 131 | assert_uverbs_usecnt(uobj, UVERBS_LOOKUP_WRITE); |
87ad80ab | 132 | |
849e1490 JG |
133 | if (reason == RDMA_REMOVE_ABORT) { |
134 | WARN_ON(!list_empty(&uobj->list)); | |
135 | WARN_ON(!uobj->context); | |
136 | uobj->uapi_object->type_class->alloc_abort(uobj); | |
137 | } else if (uobj->object) { | |
a6a3797d SR |
138 | ret = uobj->uapi_object->type_class->destroy_hw(uobj, reason, |
139 | attrs); | |
efa968ee LR |
140 | if (ret) |
141 | /* Nothing to be done, wait till ucontext will clean it */ | |
142 | return ret; | |
87ad80ab JG |
143 | |
144 | uobj->object = NULL; | |
145 | } | |
146 | ||
87ad80ab JG |
147 | uobj->context = NULL; |
148 | ||
149 | /* | |
c85f4abe JG |
150 | * For DESTROY the usecnt is not changed, the caller is expected to |
151 | * manage it via uobj_put_destroy(). Only DESTROY can remove the IDR | |
152 | * handle. | |
87ad80ab JG |
153 | */ |
154 | if (reason != RDMA_REMOVE_DESTROY) | |
155 | atomic_set(&uobj->usecnt, 0); | |
0f50d88a | 156 | else |
6b0d08f4 | 157 | uobj->uapi_object->type_class->remove_handle(uobj); |
87ad80ab JG |
158 | |
159 | if (!list_empty(&uobj->list)) { | |
160 | spin_lock_irqsave(&ufile->uobjects_lock, flags); | |
161 | list_del_init(&uobj->list); | |
162 | spin_unlock_irqrestore(&ufile->uobjects_lock, flags); | |
163 | ||
164 | /* | |
165 | * Pairs with the get in rdma_alloc_commit_uobject(), could | |
166 | * destroy uobj. | |
167 | */ | |
168 | uverbs_uobject_put(uobj); | |
169 | } | |
170 | ||
171 | /* | |
172 | * When aborting the stack kref remains owned by the core code, and is | |
173 | * not transferred into the type. Pairs with the get in alloc_uobj | |
174 | */ | |
175 | if (reason == RDMA_REMOVE_ABORT) | |
176 | uverbs_uobject_put(uobj); | |
177 | ||
178 | return 0; | |
179 | } | |
180 | ||
7452a3c7 JG |
181 | /* |
182 | * This calls uverbs_destroy_uobject() using the RDMA_REMOVE_DESTROY | |
183 | * sequence. It should only be used from command callbacks. On success the | |
c85f4abe | 184 | * caller must pair this with uobj_put_destroy(). This |
7452a3c7 JG |
185 | * version requires the caller to have already obtained an |
186 | * LOOKUP_DESTROY uobject kref. | |
187 | */ | |
a6a3797d | 188 | int uobj_destroy(struct ib_uobject *uobj, struct uverbs_attr_bundle *attrs) |
7452a3c7 | 189 | { |
feec576a | 190 | struct ib_uverbs_file *ufile = attrs->ufile; |
7452a3c7 JG |
191 | int ret; |
192 | ||
193 | down_read(&ufile->hw_destroy_rwsem); | |
194 | ||
c85f4abe JG |
195 | /* |
196 | * Once the uobject is destroyed by RDMA_REMOVE_DESTROY then it is left | |
197 | * write locked as the callers put it back with UVERBS_LOOKUP_DESTROY. | |
198 | * This is because any other concurrent thread can still see the object | |
199 | * in the xarray due to RCU. Leaving it locked ensures nothing else will | |
200 | * touch it. | |
201 | */ | |
7452a3c7 JG |
202 | ret = uverbs_try_lock_object(uobj, UVERBS_LOOKUP_WRITE); |
203 | if (ret) | |
204 | goto out_unlock; | |
205 | ||
a6a3797d | 206 | ret = uverbs_destroy_uobject(uobj, RDMA_REMOVE_DESTROY, attrs); |
7452a3c7 JG |
207 | if (ret) { |
208 | atomic_set(&uobj->usecnt, 0); | |
209 | goto out_unlock; | |
210 | } | |
211 | ||
212 | out_unlock: | |
213 | up_read(&ufile->hw_destroy_rwsem); | |
214 | return ret; | |
215 | } | |
216 | ||
c33e73af | 217 | /* |
32ed5c00 JG |
218 | * uobj_get_destroy destroys the HW object and returns a handle to the uobj |
219 | * with a NULL object pointer. The caller must pair this with | |
c85f4abe | 220 | * uobj_put_destroy(). |
c33e73af | 221 | */ |
6b0d08f4 | 222 | struct ib_uobject *__uobj_get_destroy(const struct uverbs_api_object *obj, |
70f06b26 | 223 | u32 id, struct uverbs_attr_bundle *attrs) |
c33e73af JG |
224 | { |
225 | struct ib_uobject *uobj; | |
226 | int ret; | |
227 | ||
8313c10f | 228 | uobj = rdma_lookup_get_uobject(obj, attrs->ufile, id, |
70f06b26 | 229 | UVERBS_LOOKUP_DESTROY, attrs); |
c33e73af | 230 | if (IS_ERR(uobj)) |
32ed5c00 | 231 | return uobj; |
c33e73af | 232 | |
a6a3797d | 233 | ret = uobj_destroy(uobj, attrs); |
32ed5c00 | 234 | if (ret) { |
7452a3c7 | 235 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_DESTROY); |
32ed5c00 JG |
236 | return ERR_PTR(ret); |
237 | } | |
c33e73af | 238 | |
32ed5c00 JG |
239 | return uobj; |
240 | } | |
241 | ||
242 | /* | |
7106a976 JG |
243 | * Does both uobj_get_destroy() and uobj_put_destroy(). Returns 0 on success |
244 | * (negative errno on failure). For use by callers that do not need the uobj. | |
32ed5c00 | 245 | */ |
6b0d08f4 | 246 | int __uobj_perform_destroy(const struct uverbs_api_object *obj, u32 id, |
70f06b26 | 247 | struct uverbs_attr_bundle *attrs) |
32ed5c00 JG |
248 | { |
249 | struct ib_uobject *uobj; | |
250 | ||
8313c10f | 251 | uobj = __uobj_get_destroy(obj, id, attrs); |
32ed5c00 JG |
252 | if (IS_ERR(uobj)) |
253 | return PTR_ERR(uobj); | |
c85f4abe | 254 | uobj_put_destroy(uobj); |
7106a976 | 255 | return 0; |
c33e73af JG |
256 | } |
257 | ||
87ad80ab | 258 | /* alloc_uobj must be undone by uverbs_destroy_uobject() */ |
39e83af8 | 259 | static struct ib_uobject *alloc_uobj(struct uverbs_attr_bundle *attrs, |
6b0d08f4 | 260 | const struct uverbs_api_object *obj) |
38321256 | 261 | { |
39e83af8 | 262 | struct ib_uverbs_file *ufile = attrs->ufile; |
22fa27fb | 263 | struct ib_uobject *uobj; |
22fa27fb | 264 | |
39e83af8 JG |
265 | if (!attrs->context) { |
266 | struct ib_ucontext *ucontext = | |
267 | ib_uverbs_get_ucontext_file(ufile); | |
268 | ||
269 | if (IS_ERR(ucontext)) | |
270 | return ERR_CAST(ucontext); | |
271 | attrs->context = ucontext; | |
272 | } | |
38321256 | 273 | |
6b0d08f4 | 274 | uobj = kzalloc(obj->type_attrs->obj_size, GFP_KERNEL); |
38321256 MB |
275 | if (!uobj) |
276 | return ERR_PTR(-ENOMEM); | |
277 | /* | |
278 | * user_handle should be filled by the handler, | |
279 | * The object is added to the list in the commit stage. | |
280 | */ | |
6ef1c828 | 281 | uobj->ufile = ufile; |
39e83af8 | 282 | uobj->context = attrs->context; |
5671f79b | 283 | INIT_LIST_HEAD(&uobj->list); |
6b0d08f4 | 284 | uobj->uapi_object = obj; |
d9dc7a35 JG |
285 | /* |
286 | * Allocated objects start out as write locked to deny any other | |
287 | * syscalls from accessing them until they are committed. See | |
288 | * rdma_alloc_commit_uobject | |
289 | */ | |
290 | atomic_set(&uobj->usecnt, -1); | |
38321256 MB |
291 | kref_init(&uobj->ref); |
292 | ||
293 | return uobj; | |
294 | } | |
295 | ||
296 | static int idr_add_uobj(struct ib_uobject *uobj) | |
297 | { | |
b9b0f345 MW |
298 | /* |
299 | * We start with allocating an idr pointing to NULL. This represents an | |
300 | * object which isn't initialized yet. We'll replace it later on with | |
301 | * the real object once we commit. | |
302 | */ | |
303 | return xa_alloc(&uobj->ufile->idr, &uobj->id, NULL, xa_limit_32b, | |
304 | GFP_KERNEL); | |
38321256 MB |
305 | } |
306 | ||
38321256 | 307 | /* Returns the ib_uobject or an error. The caller should check for IS_ERR. */ |
6ef1c828 | 308 | static struct ib_uobject * |
6b0d08f4 | 309 | lookup_get_idr_uobject(const struct uverbs_api_object *obj, |
9867f5c6 JG |
310 | struct ib_uverbs_file *ufile, s64 id, |
311 | enum rdma_lookup_mode mode) | |
38321256 MB |
312 | { |
313 | struct ib_uobject *uobj; | |
1250c304 JG |
314 | |
315 | if (id < 0 || id > ULONG_MAX) | |
316 | return ERR_PTR(-EINVAL); | |
38321256 MB |
317 | |
318 | rcu_read_lock(); | |
6623e3e3 LR |
319 | /* |
320 | * The idr_find is guaranteed to return a pointer to something that | |
321 | * isn't freed yet, or NULL, as the free after idr_remove goes through | |
322 | * kfree_rcu(). However the object may still have been released and | |
323 | * kfree() could be called at any time. | |
324 | */ | |
b9b0f345 MW |
325 | uobj = xa_load(&ufile->idr, id); |
326 | if (!uobj || !kref_get_unless_zero(&uobj->ref)) | |
6623e3e3 | 327 | uobj = ERR_PTR(-ENOENT); |
38321256 MB |
328 | rcu_read_unlock(); |
329 | return uobj; | |
330 | } | |
331 | ||
9867f5c6 | 332 | static struct ib_uobject * |
6b0d08f4 | 333 | lookup_get_fd_uobject(const struct uverbs_api_object *obj, |
9867f5c6 JG |
334 | struct ib_uverbs_file *ufile, s64 id, |
335 | enum rdma_lookup_mode mode) | |
cf8966b3 | 336 | { |
6b0d08f4 | 337 | const struct uverbs_obj_fd_type *fd_type; |
cf8966b3 MB |
338 | struct file *f; |
339 | struct ib_uobject *uobject; | |
1250c304 | 340 | int fdno = id; |
cf8966b3 | 341 | |
1250c304 JG |
342 | if (fdno != id) |
343 | return ERR_PTR(-EINVAL); | |
344 | ||
9867f5c6 | 345 | if (mode != UVERBS_LOOKUP_READ) |
cf8966b3 MB |
346 | return ERR_PTR(-EOPNOTSUPP); |
347 | ||
6b0d08f4 JG |
348 | if (!obj->type_attrs) |
349 | return ERR_PTR(-EIO); | |
350 | fd_type = | |
351 | container_of(obj->type_attrs, struct uverbs_obj_fd_type, type); | |
352 | ||
1250c304 | 353 | f = fget(fdno); |
cf8966b3 MB |
354 | if (!f) |
355 | return ERR_PTR(-EBADF); | |
356 | ||
357 | uobject = f->private_data; | |
358 | /* | |
f7c8416c JG |
359 | * fget(id) ensures we are not currently running |
360 | * uverbs_uobject_fd_release(), and the caller is expected to ensure | |
361 | * that release is never done while a call to lookup is possible. | |
cf8966b3 | 362 | */ |
0fb00941 | 363 | if (f->f_op != fd_type->fops || uobject->ufile != ufile) { |
cf8966b3 MB |
364 | fput(f); |
365 | return ERR_PTR(-EBADF); | |
366 | } | |
367 | ||
368 | uverbs_uobject_get(uobject); | |
369 | return uobject; | |
370 | } | |
371 | ||
6b0d08f4 | 372 | struct ib_uobject *rdma_lookup_get_uobject(const struct uverbs_api_object *obj, |
1250c304 | 373 | struct ib_uverbs_file *ufile, s64 id, |
70f06b26 SR |
374 | enum rdma_lookup_mode mode, |
375 | struct uverbs_attr_bundle *attrs) | |
38321256 MB |
376 | { |
377 | struct ib_uobject *uobj; | |
378 | int ret; | |
379 | ||
b9b0f345 | 380 | if (obj == ERR_PTR(-ENOMSG)) { |
4d7e8cc5 YH |
381 | /* must be UVERBS_IDR_ANY_OBJECT, see uapi_get_object() */ |
382 | uobj = lookup_get_idr_uobject(NULL, ufile, id, mode); | |
383 | if (IS_ERR(uobj)) | |
384 | return uobj; | |
385 | } else { | |
386 | if (IS_ERR(obj)) | |
387 | return ERR_PTR(-EINVAL); | |
388 | ||
389 | uobj = obj->type_class->lookup_get(obj, ufile, id, mode); | |
390 | if (IS_ERR(uobj)) | |
391 | return uobj; | |
392 | ||
393 | if (uobj->uapi_object != obj) { | |
394 | ret = -EINVAL; | |
395 | goto free; | |
396 | } | |
38321256 MB |
397 | } |
398 | ||
cc2e14e6 JG |
399 | /* |
400 | * If we have been disassociated block every command except for | |
401 | * DESTROY based commands. | |
402 | */ | |
403 | if (mode != UVERBS_LOOKUP_DESTROY && | |
404 | !srcu_dereference(ufile->device->ib_dev, | |
405 | &ufile->device->disassociate_srcu)) { | |
406 | ret = -EIO; | |
407 | goto free; | |
408 | } | |
409 | ||
9867f5c6 | 410 | ret = uverbs_try_lock_object(uobj, mode); |
e951747a | 411 | if (ret) |
38321256 | 412 | goto free; |
70f06b26 SR |
413 | if (attrs) |
414 | attrs->context = uobj->context; | |
38321256 MB |
415 | |
416 | return uobj; | |
417 | free: | |
4d7e8cc5 | 418 | uobj->uapi_object->type_class->lookup_put(uobj, mode); |
38321256 MB |
419 | uverbs_uobject_put(uobj); |
420 | return ERR_PTR(ret); | |
421 | } | |
422 | ||
6b0d08f4 JG |
423 | static struct ib_uobject * |
424 | alloc_begin_idr_uobject(const struct uverbs_api_object *obj, | |
39e83af8 | 425 | struct uverbs_attr_bundle *attrs) |
38321256 MB |
426 | { |
427 | int ret; | |
428 | struct ib_uobject *uobj; | |
429 | ||
39e83af8 | 430 | uobj = alloc_uobj(attrs, obj); |
38321256 MB |
431 | if (IS_ERR(uobj)) |
432 | return uobj; | |
433 | ||
434 | ret = idr_add_uobj(uobj); | |
435 | if (ret) | |
436 | goto uobj_put; | |
437 | ||
22fa27fb | 438 | ret = ib_rdmacg_try_charge(&uobj->cg_obj, uobj->context->device, |
38321256 MB |
439 | RDMACG_RESOURCE_HCA_OBJECT); |
440 | if (ret) | |
b9b0f345 | 441 | goto remove; |
38321256 MB |
442 | |
443 | return uobj; | |
444 | ||
b9b0f345 | 445 | remove: |
39e83af8 | 446 | xa_erase(&attrs->ufile->idr, uobj->id); |
38321256 MB |
447 | uobj_put: |
448 | uverbs_uobject_put(uobj); | |
449 | return ERR_PTR(ret); | |
450 | } | |
451 | ||
6b0d08f4 JG |
452 | static struct ib_uobject * |
453 | alloc_begin_fd_uobject(const struct uverbs_api_object *obj, | |
39e83af8 | 454 | struct uverbs_attr_bundle *attrs) |
cf8966b3 | 455 | { |
4121fb0d | 456 | const struct uverbs_obj_fd_type *fd_type; |
cf8966b3 | 457 | int new_fd; |
4121fb0d | 458 | struct ib_uobject *uobj, *ret; |
849e1490 JG |
459 | struct file *filp; |
460 | ||
4121fb0d LR |
461 | uobj = alloc_uobj(attrs, obj); |
462 | if (IS_ERR(uobj)) | |
463 | return uobj; | |
464 | ||
465 | fd_type = | |
466 | container_of(obj->type_attrs, struct uverbs_obj_fd_type, type); | |
c485b19d | 467 | if (WARN_ON(fd_type->fops->release != &uverbs_uobject_fd_release && |
4121fb0d LR |
468 | fd_type->fops->release != &uverbs_async_event_release)) { |
469 | ret = ERR_PTR(-EINVAL); | |
470 | goto err_fd; | |
471 | } | |
cf8966b3 MB |
472 | |
473 | new_fd = get_unused_fd_flags(O_CLOEXEC); | |
4121fb0d LR |
474 | if (new_fd < 0) { |
475 | ret = ERR_PTR(new_fd); | |
849e1490 | 476 | goto err_fd; |
4121fb0d | 477 | } |
849e1490 JG |
478 | |
479 | /* Note that uverbs_uobject_fd_release() is called during abort */ | |
480 | filp = anon_inode_getfile(fd_type->name, fd_type->fops, NULL, | |
481 | fd_type->flags); | |
482 | if (IS_ERR(filp)) { | |
4121fb0d LR |
483 | ret = ERR_CAST(filp); |
484 | goto err_getfile; | |
cf8966b3 | 485 | } |
849e1490 | 486 | uobj->object = filp; |
cf8966b3 | 487 | |
d0259e82 | 488 | uobj->id = new_fd; |
849e1490 | 489 | return uobj; |
cf8966b3 | 490 | |
4121fb0d | 491 | err_getfile: |
849e1490 | 492 | put_unused_fd(new_fd); |
4121fb0d LR |
493 | err_fd: |
494 | uverbs_uobject_put(uobj); | |
495 | return ret; | |
cf8966b3 MB |
496 | } |
497 | ||
6b0d08f4 | 498 | struct ib_uobject *rdma_alloc_begin_uobject(const struct uverbs_api_object *obj, |
70f06b26 | 499 | struct uverbs_attr_bundle *attrs) |
38321256 | 500 | { |
39e83af8 | 501 | struct ib_uverbs_file *ufile = attrs->ufile; |
1e857e65 JG |
502 | struct ib_uobject *ret; |
503 | ||
4d7e8cc5 | 504 | if (IS_ERR(obj)) |
6b0d08f4 JG |
505 | return ERR_PTR(-EINVAL); |
506 | ||
1e857e65 JG |
507 | /* |
508 | * The hw_destroy_rwsem is held across the entire object creation and | |
509 | * released during rdma_alloc_commit_uobject or | |
510 | * rdma_alloc_abort_uobject | |
511 | */ | |
512 | if (!down_read_trylock(&ufile->hw_destroy_rwsem)) | |
513 | return ERR_PTR(-EIO); | |
514 | ||
39e83af8 | 515 | ret = obj->type_class->alloc_begin(obj, attrs); |
1e857e65 JG |
516 | if (IS_ERR(ret)) { |
517 | up_read(&ufile->hw_destroy_rwsem); | |
518 | return ret; | |
519 | } | |
520 | return ret; | |
38321256 MB |
521 | } |
522 | ||
87ad80ab JG |
523 | static void alloc_abort_idr_uobject(struct ib_uobject *uobj) |
524 | { | |
525 | ib_rdmacg_uncharge(&uobj->cg_obj, uobj->context->device, | |
526 | RDMACG_RESOURCE_HCA_OBJECT); | |
527 | ||
b9b0f345 | 528 | xa_erase(&uobj->ufile->idr, uobj->id); |
87ad80ab JG |
529 | } |
530 | ||
0f50d88a | 531 | static int __must_check destroy_hw_idr_uobject(struct ib_uobject *uobj, |
a6a3797d SR |
532 | enum rdma_remove_reason why, |
533 | struct uverbs_attr_bundle *attrs) | |
38321256 MB |
534 | { |
535 | const struct uverbs_obj_idr_type *idr_type = | |
6b0d08f4 JG |
536 | container_of(uobj->uapi_object->type_attrs, |
537 | struct uverbs_obj_idr_type, type); | |
a6a3797d | 538 | int ret = idr_type->destroy_object(uobj, why, attrs); |
38321256 | 539 | |
efa968ee | 540 | if (ret) |
38321256 MB |
541 | return ret; |
542 | ||
87ad80ab JG |
543 | if (why == RDMA_REMOVE_ABORT) |
544 | return 0; | |
5671f79b | 545 | |
0f50d88a JG |
546 | ib_rdmacg_uncharge(&uobj->cg_obj, uobj->context->device, |
547 | RDMACG_RESOURCE_HCA_OBJECT); | |
38321256 | 548 | |
87ad80ab | 549 | return 0; |
38321256 MB |
550 | } |
551 | ||
0f50d88a JG |
552 | static void remove_handle_idr_uobject(struct ib_uobject *uobj) |
553 | { | |
b9b0f345 | 554 | xa_erase(&uobj->ufile->idr, uobj->id); |
0f50d88a JG |
555 | /* Matches the kref in alloc_commit_idr_uobject */ |
556 | uverbs_uobject_put(uobj); | |
557 | } | |
558 | ||
cf8966b3 MB |
559 | static void alloc_abort_fd_uobject(struct ib_uobject *uobj) |
560 | { | |
849e1490 JG |
561 | struct file *filp = uobj->object; |
562 | ||
563 | fput(filp); | |
aba94548 | 564 | put_unused_fd(uobj->id); |
cf8966b3 MB |
565 | } |
566 | ||
0f50d88a | 567 | static int __must_check destroy_hw_fd_uobject(struct ib_uobject *uobj, |
a6a3797d SR |
568 | enum rdma_remove_reason why, |
569 | struct uverbs_attr_bundle *attrs) | |
cf8966b3 | 570 | { |
6b0d08f4 JG |
571 | const struct uverbs_obj_fd_type *fd_type = container_of( |
572 | uobj->uapi_object->type_attrs, struct uverbs_obj_fd_type, type); | |
cf8966b3 | 573 | |
c5633a72 LR |
574 | fd_type->destroy_object(uobj, why); |
575 | return 0; | |
38321256 MB |
576 | } |
577 | ||
0f50d88a JG |
578 | static void remove_handle_fd_uobject(struct ib_uobject *uobj) |
579 | { | |
580 | } | |
581 | ||
849e1490 | 582 | static void alloc_commit_idr_uobject(struct ib_uobject *uobj) |
38321256 | 583 | { |
c561c288 | 584 | struct ib_uverbs_file *ufile = uobj->ufile; |
b9b0f345 | 585 | void *old; |
c561c288 | 586 | |
38321256 MB |
587 | /* |
588 | * We already allocated this IDR with a NULL object, so | |
589 | * this shouldn't fail. | |
c561c288 | 590 | * |
b9b0f345 | 591 | * NOTE: Storing the uobj transfers our kref on uobj to the XArray. |
c561c288 | 592 | * It will be put by remove_commit_idr_uobject() |
38321256 | 593 | */ |
b9b0f345 MW |
594 | old = xa_store(&ufile->idr, uobj->id, uobj, GFP_KERNEL); |
595 | WARN_ON(old != NULL); | |
38321256 MB |
596 | } |
597 | ||
6e0954b1 JG |
598 | static void swap_idr_uobjects(struct ib_uobject *obj_old, |
599 | struct ib_uobject *obj_new) | |
600 | { | |
601 | struct ib_uverbs_file *ufile = obj_old->ufile; | |
602 | void *old; | |
603 | ||
604 | /* | |
605 | * New must be an object that been allocated but not yet committed, this | |
606 | * moves the pre-committed state to obj_old, new still must be comitted. | |
607 | */ | |
608 | old = xa_cmpxchg(&ufile->idr, obj_old->id, obj_old, XA_ZERO_ENTRY, | |
609 | GFP_KERNEL); | |
610 | if (WARN_ON(old != obj_old)) | |
611 | return; | |
612 | ||
613 | swap(obj_old->id, obj_new->id); | |
614 | ||
615 | old = xa_cmpxchg(&ufile->idr, obj_old->id, NULL, obj_old, GFP_KERNEL); | |
616 | WARN_ON(old != NULL); | |
617 | } | |
618 | ||
849e1490 | 619 | static void alloc_commit_fd_uobject(struct ib_uobject *uobj) |
cf8966b3 | 620 | { |
c561c288 | 621 | int fd = uobj->id; |
849e1490 | 622 | struct file *filp = uobj->object; |
aba94548 | 623 | |
f7c8416c | 624 | /* Matching put will be done in uverbs_uobject_fd_release() */ |
aba94548 | 625 | kref_get(&uobj->ufile->ref); |
c561c288 | 626 | |
cf8966b3 | 627 | /* This shouldn't be used anymore. Use the file object instead */ |
d0259e82 | 628 | uobj->id = 0; |
c561c288 | 629 | |
c561c288 JG |
630 | /* |
631 | * NOTE: Once we install the file we loose ownership of our kref on | |
f7c8416c | 632 | * uobj. It will be put by uverbs_uobject_fd_release() |
c561c288 | 633 | */ |
849e1490 | 634 | filp->private_data = uobj; |
aba94548 | 635 | fd_install(fd, filp); |
cf8966b3 MB |
636 | } |
637 | ||
c561c288 JG |
638 | /* |
639 | * In all cases rdma_alloc_commit_uobject() consumes the kref to uobj and the | |
2c96eb7d JG |
640 | * caller can no longer assume uobj is valid. If this function fails it |
641 | * destroys the uboject, including the attached HW object. | |
c561c288 | 642 | */ |
849e1490 JG |
643 | void rdma_alloc_commit_uobject(struct ib_uobject *uobj, |
644 | struct uverbs_attr_bundle *attrs) | |
38321256 | 645 | { |
feec576a | 646 | struct ib_uverbs_file *ufile = attrs->ufile; |
6a5e9c88 | 647 | |
5671f79b JG |
648 | /* kref is held so long as the uobj is on the uobj list. */ |
649 | uverbs_uobject_get(uobj); | |
87064277 | 650 | spin_lock_irq(&ufile->uobjects_lock); |
6a5e9c88 | 651 | list_add(&uobj->list, &ufile->uobjects); |
87064277 | 652 | spin_unlock_irq(&ufile->uobjects_lock); |
8efe991e | 653 | |
aba94548 JG |
654 | /* matches atomic_set(-1) in alloc_uobj */ |
655 | atomic_set(&uobj->usecnt, 0); | |
656 | ||
0d1fd39b LR |
657 | /* alloc_commit consumes the uobj kref */ |
658 | uobj->uapi_object->type_class->alloc_commit(uobj); | |
659 | ||
1e857e65 | 660 | /* Matches the down_read in rdma_alloc_begin_uobject */ |
87064277 | 661 | up_read(&ufile->hw_destroy_rwsem); |
38321256 MB |
662 | } |
663 | ||
6e0954b1 JG |
664 | /* |
665 | * new_uobj will be assigned to the handle currently used by to_uobj, and | |
666 | * to_uobj will be destroyed. | |
667 | * | |
668 | * Upon return the caller must do: | |
669 | * rdma_alloc_commit_uobject(new_uobj) | |
670 | * uobj_put_destroy(to_uobj) | |
671 | * | |
672 | * to_uobj must have a write get but the put mode switches to destroy once | |
673 | * this is called. | |
674 | */ | |
675 | void rdma_assign_uobject(struct ib_uobject *to_uobj, struct ib_uobject *new_uobj, | |
676 | struct uverbs_attr_bundle *attrs) | |
677 | { | |
678 | assert_uverbs_usecnt(new_uobj, UVERBS_LOOKUP_WRITE); | |
679 | ||
680 | if (WARN_ON(to_uobj->uapi_object != new_uobj->uapi_object || | |
681 | !to_uobj->uapi_object->type_class->swap_uobjects)) | |
682 | return; | |
683 | ||
684 | to_uobj->uapi_object->type_class->swap_uobjects(to_uobj, new_uobj); | |
685 | ||
686 | /* | |
687 | * If this fails then the uobject is still completely valid (though with | |
688 | * a new ID) and we leak it until context close. | |
689 | */ | |
690 | uverbs_destroy_uobject(to_uobj, RDMA_REMOVE_DESTROY, attrs); | |
691 | } | |
692 | ||
5671f79b JG |
693 | /* |
694 | * This consumes the kref for uobj. It is up to the caller to unwind the HW | |
695 | * object and anything else connected to uobj before calling this. | |
696 | */ | |
a6a3797d | 697 | void rdma_alloc_abort_uobject(struct ib_uobject *uobj, |
0ac8903c JG |
698 | struct uverbs_attr_bundle *attrs, |
699 | bool hw_obj_valid) | |
38321256 | 700 | { |
1e857e65 | 701 | struct ib_uverbs_file *ufile = uobj->ufile; |
f553246f JG |
702 | int ret; |
703 | ||
704 | if (hw_obj_valid) { | |
705 | ret = uobj->uapi_object->type_class->destroy_hw( | |
706 | uobj, RDMA_REMOVE_ABORT, attrs); | |
707 | /* | |
708 | * If the driver couldn't destroy the object then go ahead and | |
709 | * commit it. Leaking objects that can't be destroyed is only | |
710 | * done during FD close after the driver has a few more tries to | |
711 | * destroy it. | |
712 | */ | |
713 | if (WARN_ON(ret)) | |
714 | return rdma_alloc_commit_uobject(uobj, attrs); | |
715 | } | |
1e857e65 | 716 | |
f553246f | 717 | uverbs_destroy_uobject(uobj, RDMA_REMOVE_ABORT, attrs); |
1e857e65 JG |
718 | |
719 | /* Matches the down_read in rdma_alloc_begin_uobject */ | |
720 | up_read(&ufile->hw_destroy_rwsem); | |
38321256 MB |
721 | } |
722 | ||
9867f5c6 JG |
723 | static void lookup_put_idr_uobject(struct ib_uobject *uobj, |
724 | enum rdma_lookup_mode mode) | |
38321256 MB |
725 | { |
726 | } | |
727 | ||
9867f5c6 JG |
728 | static void lookup_put_fd_uobject(struct ib_uobject *uobj, |
729 | enum rdma_lookup_mode mode) | |
cf8966b3 MB |
730 | { |
731 | struct file *filp = uobj->object; | |
732 | ||
9867f5c6 | 733 | WARN_ON(mode != UVERBS_LOOKUP_READ); |
f7c8416c JG |
734 | /* |
735 | * This indirectly calls uverbs_uobject_fd_release() and free the | |
736 | * object | |
737 | */ | |
cf8966b3 MB |
738 | fput(filp); |
739 | } | |
740 | ||
9867f5c6 JG |
741 | void rdma_lookup_put_uobject(struct ib_uobject *uobj, |
742 | enum rdma_lookup_mode mode) | |
38321256 | 743 | { |
9867f5c6 | 744 | assert_uverbs_usecnt(uobj, mode); |
38321256 MB |
745 | /* |
746 | * In order to unlock an object, either decrease its usecnt for | |
30004b86 | 747 | * read access or zero it in case of exclusive access. See |
38321256 MB |
748 | * uverbs_try_lock_object for locking schema information. |
749 | */ | |
9867f5c6 JG |
750 | switch (mode) { |
751 | case UVERBS_LOOKUP_READ: | |
38321256 | 752 | atomic_dec(&uobj->usecnt); |
9867f5c6 JG |
753 | break; |
754 | case UVERBS_LOOKUP_WRITE: | |
38321256 | 755 | atomic_set(&uobj->usecnt, 0); |
9867f5c6 | 756 | break; |
7452a3c7 JG |
757 | case UVERBS_LOOKUP_DESTROY: |
758 | break; | |
9867f5c6 | 759 | } |
38321256 | 760 | |
f0abc761 | 761 | uobj->uapi_object->type_class->lookup_put(uobj, mode); |
5671f79b | 762 | /* Pairs with the kref obtained by type->lookup_get */ |
38321256 MB |
763 | uverbs_uobject_put(uobj); |
764 | } | |
765 | ||
0f50d88a JG |
766 | void setup_ufile_idr_uobject(struct ib_uverbs_file *ufile) |
767 | { | |
b9b0f345 | 768 | xa_init_flags(&ufile->idr, XA_FLAGS_ALLOC); |
0f50d88a JG |
769 | } |
770 | ||
771 | void release_ufile_idr_uobject(struct ib_uverbs_file *ufile) | |
772 | { | |
773 | struct ib_uobject *entry; | |
b9b0f345 | 774 | unsigned long id; |
0f50d88a JG |
775 | |
776 | /* | |
777 | * At this point uverbs_cleanup_ufile() is guaranteed to have run, and | |
b9b0f345 | 778 | * there are no HW objects left, however the xarray is still populated |
0f50d88a JG |
779 | * with anything that has not been cleaned up by userspace. Since the |
780 | * kref on ufile is 0, nothing is allowed to call lookup_get. | |
781 | * | |
782 | * This is an optimized equivalent to remove_handle_idr_uobject | |
783 | */ | |
b9b0f345 | 784 | xa_for_each(&ufile->idr, id, entry) { |
0f50d88a JG |
785 | WARN_ON(entry->object); |
786 | uverbs_uobject_put(entry); | |
787 | } | |
788 | ||
b9b0f345 | 789 | xa_destroy(&ufile->idr); |
0f50d88a JG |
790 | } |
791 | ||
38321256 MB |
792 | const struct uverbs_obj_type_class uverbs_idr_class = { |
793 | .alloc_begin = alloc_begin_idr_uobject, | |
794 | .lookup_get = lookup_get_idr_uobject, | |
795 | .alloc_commit = alloc_commit_idr_uobject, | |
796 | .alloc_abort = alloc_abort_idr_uobject, | |
797 | .lookup_put = lookup_put_idr_uobject, | |
0f50d88a JG |
798 | .destroy_hw = destroy_hw_idr_uobject, |
799 | .remove_handle = remove_handle_idr_uobject, | |
6e0954b1 | 800 | .swap_uobjects = swap_idr_uobjects, |
38321256 | 801 | }; |
1114b0a8 | 802 | EXPORT_SYMBOL(uverbs_idr_class); |
38321256 | 803 | |
f7c8416c JG |
804 | /* |
805 | * Users of UVERBS_TYPE_ALLOC_FD should set this function as the struct | |
806 | * file_operations release method. | |
807 | */ | |
808 | int uverbs_uobject_fd_release(struct inode *inode, struct file *filp) | |
cf8966b3 | 809 | { |
849e1490 JG |
810 | struct ib_uverbs_file *ufile; |
811 | struct ib_uobject *uobj; | |
812 | ||
813 | /* | |
814 | * This can only happen if the fput came from alloc_abort_fd_uobject() | |
815 | */ | |
816 | if (!filp->private_data) | |
817 | return 0; | |
818 | uobj = filp->private_data; | |
819 | ufile = uobj->ufile; | |
e6d5d5dd | 820 | |
87064277 | 821 | if (down_read_trylock(&ufile->hw_destroy_rwsem)) { |
849e1490 JG |
822 | struct uverbs_attr_bundle attrs = { |
823 | .context = uobj->context, | |
824 | .ufile = ufile, | |
825 | }; | |
826 | ||
87ad80ab JG |
827 | /* |
828 | * lookup_get_fd_uobject holds the kref on the struct file any | |
829 | * time a FD uobj is locked, which prevents this release | |
830 | * method from being invoked. Meaning we can always get the | |
831 | * write lock here, or we have a kernel bug. | |
832 | */ | |
9867f5c6 | 833 | WARN_ON(uverbs_try_lock_object(uobj, UVERBS_LOOKUP_WRITE)); |
a6a3797d | 834 | uverbs_destroy_uobject(uobj, RDMA_REMOVE_CLOSE, &attrs); |
87064277 | 835 | up_read(&ufile->hw_destroy_rwsem); |
e6d5d5dd JG |
836 | } |
837 | ||
849e1490 | 838 | /* Matches the get in alloc_commit_fd_uobject() */ |
e6d5d5dd | 839 | kref_put(&ufile->ref, ib_uverbs_release_file); |
cf8966b3 | 840 | |
5671f79b | 841 | /* Pairs with filp->private_data in alloc_begin_fd_uobject */ |
d0259e82 | 842 | uverbs_uobject_put(uobj); |
f7c8416c | 843 | return 0; |
cf8966b3 | 844 | } |
f7c8416c | 845 | EXPORT_SYMBOL(uverbs_uobject_fd_release); |
cf8966b3 | 846 | |
e951747a JG |
847 | /* |
848 | * Drop the ucontext off the ufile and completely disconnect it from the | |
849 | * ib_device | |
850 | */ | |
851 | static void ufile_destroy_ucontext(struct ib_uverbs_file *ufile, | |
852 | enum rdma_remove_reason reason) | |
853 | { | |
854 | struct ib_ucontext *ucontext = ufile->ucontext; | |
ce92db1c | 855 | struct ib_device *ib_dev = ucontext->device; |
e951747a | 856 | |
ce92db1c JG |
857 | /* |
858 | * If we are closing the FD then the user mmap VMAs must have | |
859 | * already been destroyed as they hold on to the filep, otherwise | |
860 | * they need to be zap'd. | |
861 | */ | |
5f9794dc JG |
862 | if (reason == RDMA_REMOVE_DRIVER_REMOVE) { |
863 | uverbs_user_mmap_disassociate(ufile); | |
3023a1e9 KH |
864 | if (ib_dev->ops.disassociate_ucontext) |
865 | ib_dev->ops.disassociate_ucontext(ucontext); | |
5f9794dc | 866 | } |
e951747a | 867 | |
ce92db1c | 868 | ib_rdmacg_uncharge(&ucontext->cg_obj, ib_dev, |
e951747a JG |
869 | RDMACG_RESOURCE_HCA_HANDLE); |
870 | ||
12d23a91 LR |
871 | rdma_restrack_del(&ucontext->res); |
872 | ||
a2a074ef | 873 | ib_dev->ops.dealloc_ucontext(ucontext); |
3411f9f0 | 874 | WARN_ON(!xa_empty(&ucontext->mmap_xa)); |
a2a074ef | 875 | kfree(ucontext); |
e951747a JG |
876 | |
877 | ufile->ucontext = NULL; | |
878 | } | |
879 | ||
6ef1c828 JG |
880 | static int __uverbs_cleanup_ufile(struct ib_uverbs_file *ufile, |
881 | enum rdma_remove_reason reason) | |
38321256 | 882 | { |
1c77483e YH |
883 | struct ib_uobject *obj, *next_obj; |
884 | int ret = -EINVAL; | |
a6a3797d | 885 | struct uverbs_attr_bundle attrs = { .ufile = ufile }; |
38321256 | 886 | |
1c77483e YH |
887 | /* |
888 | * This shouldn't run while executing other commands on this | |
889 | * context. Thus, the only thing we should take care of is | |
890 | * releasing a FD while traversing this list. The FD could be | |
891 | * closed and released from the _release fop of this FD. | |
892 | * In order to mitigate this, we add a lock. | |
893 | * We take and release the lock per traversal in order to let | |
894 | * other threads (which might still use the FDs) chance to run. | |
895 | */ | |
6a5e9c88 | 896 | list_for_each_entry_safe(obj, next_obj, &ufile->uobjects, list) { |
a6a3797d | 897 | attrs.context = obj->context; |
1c77483e YH |
898 | /* |
899 | * if we hit this WARN_ON, that means we are | |
900 | * racing with a lookup_get. | |
901 | */ | |
9867f5c6 | 902 | WARN_ON(uverbs_try_lock_object(obj, UVERBS_LOOKUP_WRITE)); |
efa968ee LR |
903 | if (reason == RDMA_REMOVE_DRIVER_FAILURE) |
904 | obj->object = NULL; | |
a6a3797d | 905 | if (!uverbs_destroy_uobject(obj, reason, &attrs)) |
87ad80ab | 906 | ret = 0; |
e4ff3d22 AK |
907 | else |
908 | atomic_set(&obj->usecnt, 0); | |
1c77483e | 909 | } |
efa968ee LR |
910 | |
911 | if (reason == RDMA_REMOVE_DRIVER_FAILURE) { | |
912 | WARN_ON(!list_empty(&ufile->uobjects)); | |
913 | return 0; | |
914 | } | |
1c77483e YH |
915 | return ret; |
916 | } | |
917 | ||
e951747a | 918 | /* |
016b26af | 919 | * Destroy the ucontext and every uobject associated with it. |
e951747a JG |
920 | * |
921 | * This is internally locked and can be called in parallel from multiple | |
922 | * contexts. | |
923 | */ | |
924 | void uverbs_destroy_ufile_hw(struct ib_uverbs_file *ufile, | |
925 | enum rdma_remove_reason reason) | |
1c77483e | 926 | { |
e951747a | 927 | down_write(&ufile->hw_destroy_rwsem); |
6a5e9c88 | 928 | |
38321256 | 929 | /* |
e951747a JG |
930 | * If a ucontext was never created then we can't have any uobjects to |
931 | * cleanup, nothing to do. | |
38321256 | 932 | */ |
e951747a JG |
933 | if (!ufile->ucontext) |
934 | goto done; | |
935 | ||
efa968ee LR |
936 | while (!list_empty(&ufile->uobjects) && |
937 | !__uverbs_cleanup_ufile(ufile, reason)) { | |
938 | } | |
38321256 | 939 | |
efa968ee LR |
940 | if (WARN_ON(!list_empty(&ufile->uobjects))) |
941 | __uverbs_cleanup_ufile(ufile, RDMA_REMOVE_DRIVER_FAILURE); | |
e951747a JG |
942 | ufile_destroy_ucontext(ufile, reason); |
943 | ||
944 | done: | |
87064277 | 945 | up_write(&ufile->hw_destroy_rwsem); |
38321256 MB |
946 | } |
947 | ||
cf8966b3 MB |
948 | const struct uverbs_obj_type_class uverbs_fd_class = { |
949 | .alloc_begin = alloc_begin_fd_uobject, | |
950 | .lookup_get = lookup_get_fd_uobject, | |
951 | .alloc_commit = alloc_commit_fd_uobject, | |
952 | .alloc_abort = alloc_abort_fd_uobject, | |
953 | .lookup_put = lookup_put_fd_uobject, | |
0f50d88a JG |
954 | .destroy_hw = destroy_hw_fd_uobject, |
955 | .remove_handle = remove_handle_fd_uobject, | |
cf8966b3 | 956 | }; |
1114b0a8 | 957 | EXPORT_SYMBOL(uverbs_fd_class); |
cf8966b3 | 958 | |
6ef1c828 | 959 | struct ib_uobject * |
70f06b26 SR |
960 | uverbs_get_uobject_from_file(u16 object_id, enum uverbs_obj_access access, |
961 | s64 id, struct uverbs_attr_bundle *attrs) | |
a0aa309c | 962 | { |
6b0d08f4 | 963 | const struct uverbs_api_object *obj = |
70f06b26 | 964 | uapi_get_object(attrs->ufile->device->uapi, object_id); |
6b0d08f4 | 965 | |
a0aa309c MB |
966 | switch (access) { |
967 | case UVERBS_ACCESS_READ: | |
70f06b26 SR |
968 | return rdma_lookup_get_uobject(obj, attrs->ufile, id, |
969 | UVERBS_LOOKUP_READ, attrs); | |
a0aa309c | 970 | case UVERBS_ACCESS_DESTROY: |
7452a3c7 | 971 | /* Actual destruction is done inside uverbs_handle_method */ |
70f06b26 SR |
972 | return rdma_lookup_get_uobject(obj, attrs->ufile, id, |
973 | UVERBS_LOOKUP_DESTROY, attrs); | |
a0aa309c | 974 | case UVERBS_ACCESS_WRITE: |
70f06b26 SR |
975 | return rdma_lookup_get_uobject(obj, attrs->ufile, id, |
976 | UVERBS_LOOKUP_WRITE, attrs); | |
a0aa309c | 977 | case UVERBS_ACCESS_NEW: |
39e83af8 | 978 | return rdma_alloc_begin_uobject(obj, attrs); |
a0aa309c MB |
979 | default: |
980 | WARN_ON(true); | |
981 | return ERR_PTR(-EOPNOTSUPP); | |
982 | } | |
983 | } | |
984 | ||
849e1490 | 985 | void uverbs_finalize_object(struct ib_uobject *uobj, |
0ac8903c JG |
986 | enum uverbs_obj_access access, bool hw_obj_valid, |
987 | bool commit, struct uverbs_attr_bundle *attrs) | |
a0aa309c | 988 | { |
a0aa309c MB |
989 | /* |
990 | * refcounts should be handled at the object level and not at the | |
991 | * uobject level. Refcounts of the objects themselves are done in | |
992 | * handlers. | |
993 | */ | |
994 | ||
995 | switch (access) { | |
996 | case UVERBS_ACCESS_READ: | |
9867f5c6 | 997 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_READ); |
a0aa309c MB |
998 | break; |
999 | case UVERBS_ACCESS_WRITE: | |
9867f5c6 | 1000 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_WRITE); |
a0aa309c MB |
1001 | break; |
1002 | case UVERBS_ACCESS_DESTROY: | |
7452a3c7 JG |
1003 | if (uobj) |
1004 | rdma_lookup_put_uobject(uobj, UVERBS_LOOKUP_DESTROY); | |
a0aa309c MB |
1005 | break; |
1006 | case UVERBS_ACCESS_NEW: | |
1007 | if (commit) | |
849e1490 | 1008 | rdma_alloc_commit_uobject(uobj, attrs); |
a0aa309c | 1009 | else |
0ac8903c | 1010 | rdma_alloc_abort_uobject(uobj, attrs, hw_obj_valid); |
a0aa309c MB |
1011 | break; |
1012 | default: | |
1013 | WARN_ON(true); | |
a0aa309c | 1014 | } |
a0aa309c | 1015 | } |