1 // SPDX-License-Identifier: GPL-2.0 OR Linux-OpenIB
2 /*
3 * Copyright (c) 2017, Mellanox Technologies inc. All rights reserved.
4 */
5 #include <rdma/uverbs_ioctl.h>
6 #include <rdma/rdma_user_ioctl.h>
7 #include <linux/bitops.h>
8 #include "rdma_core.h"
9 #include "uverbs.h"
10
ib_uverbs_notsupp(struct uverbs_attr_bundle * attrs)11 static int ib_uverbs_notsupp(struct uverbs_attr_bundle *attrs)
12 {
13 return -EOPNOTSUPP;
14 }
15
uapi_add_elm(struct uverbs_api * uapi,u32 key,size_t alloc_size)16 static void *uapi_add_elm(struct uverbs_api *uapi, u32 key, size_t alloc_size)
17 {
18 void *elm;
19 int rc;
20
21 if (key == UVERBS_API_KEY_ERR)
22 return ERR_PTR(-EOVERFLOW);
23
24 elm = kzalloc(alloc_size, GFP_KERNEL);
25 if (!elm)
26 return ERR_PTR(-ENOMEM);
27 rc = radix_tree_insert(&uapi->radix, key, elm);
28 if (rc) {
29 kfree(elm);
30 return ERR_PTR(rc);
31 }
32
33 return elm;
34 }
35
uapi_add_get_elm(struct uverbs_api * uapi,u32 key,size_t alloc_size,bool * exists)36 static void *uapi_add_get_elm(struct uverbs_api *uapi, u32 key,
37 size_t alloc_size, bool *exists)
38 {
39 void *elm;
40
41 elm = uapi_add_elm(uapi, key, alloc_size);
42 if (!IS_ERR(elm)) {
43 *exists = false;
44 return elm;
45 }
46
47 if (elm != ERR_PTR(-EEXIST))
48 return elm;
49
50 elm = radix_tree_lookup(&uapi->radix, key);
51 if (WARN_ON(!elm))
52 return ERR_PTR(-EINVAL);
53 *exists = true;
54 return elm;
55 }
56
uapi_create_write(struct uverbs_api * uapi,struct ib_device * ibdev,const struct uapi_definition * def,u32 obj_key,u32 * cur_method_key)57 static int uapi_create_write(struct uverbs_api *uapi,
58 struct ib_device *ibdev,
59 const struct uapi_definition *def,
60 u32 obj_key,
61 u32 *cur_method_key)
62 {
63 struct uverbs_api_write_method *method_elm;
64 u32 method_key = obj_key;
65 bool exists;
66
67 if (def->write.is_ex)
68 method_key |= uapi_key_write_ex_method(def->write.command_num);
69 else
70 method_key |= uapi_key_write_method(def->write.command_num);
71
72 method_elm = uapi_add_get_elm(uapi, method_key, sizeof(*method_elm),
73 &exists);
74 if (IS_ERR(method_elm))
75 return PTR_ERR(method_elm);
76
77 if (WARN_ON(exists && (def->write.is_ex != method_elm->is_ex)))
78 return -EINVAL;
79
80 method_elm->is_ex = def->write.is_ex;
81 method_elm->handler = def->func_write;
82 if (def->write.is_ex)
83 method_elm->disabled = !(ibdev->uverbs_ex_cmd_mask &
84 BIT_ULL(def->write.command_num));
85 else
86 method_elm->disabled = !(ibdev->uverbs_cmd_mask &
87 BIT_ULL(def->write.command_num));
88
89 if (!def->write.is_ex && def->func_write) {
90 method_elm->has_udata = def->write.has_udata;
91 method_elm->has_resp = def->write.has_resp;
92 method_elm->req_size = def->write.req_size;
93 method_elm->resp_size = def->write.resp_size;
94 }
95
96 *cur_method_key = method_key;
97 return 0;
98 }
99
uapi_merge_method(struct uverbs_api * uapi,struct uverbs_api_object * obj_elm,u32 obj_key,const struct uverbs_method_def * method,bool is_driver)100 static int uapi_merge_method(struct uverbs_api *uapi,
101 struct uverbs_api_object *obj_elm, u32 obj_key,
102 const struct uverbs_method_def *method,
103 bool is_driver)
104 {
105 u32 method_key = obj_key | uapi_key_ioctl_method(method->id);
106 struct uverbs_api_ioctl_method *method_elm;
107 unsigned int i;
108 bool exists;
109
110 if (!method->attrs)
111 return 0;
112
113 method_elm = uapi_add_get_elm(uapi, method_key, sizeof(*method_elm),
114 &exists);
115 if (IS_ERR(method_elm))
116 return PTR_ERR(method_elm);
117 if (exists) {
118 /*
119 * This occurs when a driver uses ADD_UVERBS_ATTRIBUTES_SIMPLE
120 */
121 if (WARN_ON(method->handler))
122 return -EINVAL;
123 } else {
124 WARN_ON(!method->handler);
125 rcu_assign_pointer(method_elm->handler, method->handler);
126 if (method->handler != uverbs_destroy_def_handler)
127 method_elm->driver_method = is_driver;
128 }
129
130 for (i = 0; i != method->num_attrs; i++) {
131 const struct uverbs_attr_def *attr = (*method->attrs)[i];
132 struct uverbs_api_attr *attr_slot;
133
134 if (!attr)
135 continue;
136
137 /*
138 * ENUM_IN contains the 'ids' pointer to the driver's .rodata,
139 * so if it is specified by a driver then it always makes this
140 * into a driver method.
141 */
142 if (attr->attr.type == UVERBS_ATTR_TYPE_ENUM_IN)
143 method_elm->driver_method |= is_driver;
144
145 /*
146 * Like other uobject based things we only support a single
147 * uobject being NEW'd or DESTROY'd
148 */
149 if (attr->attr.type == UVERBS_ATTR_TYPE_IDRS_ARRAY) {
150 u8 access = attr->attr.u2.objs_arr.access;
151
152 if (WARN_ON(access == UVERBS_ACCESS_NEW ||
153 access == UVERBS_ACCESS_DESTROY))
154 return -EINVAL;
155 }
156
157 attr_slot =
158 uapi_add_elm(uapi, method_key | uapi_key_attr(attr->id),
159 sizeof(*attr_slot));
160 /* Attributes are not allowed to be modified by drivers */
161 if (IS_ERR(attr_slot))
162 return PTR_ERR(attr_slot);
163
164 attr_slot->spec = attr->attr;
165 }
166
167 return 0;
168 }
169
uapi_merge_obj_tree(struct uverbs_api * uapi,const struct uverbs_object_def * obj,bool is_driver)170 static int uapi_merge_obj_tree(struct uverbs_api *uapi,
171 const struct uverbs_object_def *obj,
172 bool is_driver)
173 {
174 struct uverbs_api_object *obj_elm;
175 unsigned int i;
176 u32 obj_key;
177 bool exists;
178 int rc;
179
180 obj_key = uapi_key_obj(obj->id);
181 obj_elm = uapi_add_get_elm(uapi, obj_key, sizeof(*obj_elm), &exists);
182 if (IS_ERR(obj_elm))
183 return PTR_ERR(obj_elm);
184
185 if (obj->type_attrs) {
186 if (WARN_ON(obj_elm->type_attrs))
187 return -EINVAL;
188
189 obj_elm->id = obj->id;
190 obj_elm->type_attrs = obj->type_attrs;
191 obj_elm->type_class = obj->type_attrs->type_class;
192 /*
193 * Today drivers are only permitted to use idr_class and
194 * fd_class types. We can revoke the IDR types during
195 * disassociation, and the FD types require the driver to use
196 * struct file_operations.owner to prevent the driver module
197 * code from unloading while the file is open. This provides
198 * enough safety that uverbs_uobject_fd_release() will
199 * continue to work. Drivers using FD are responsible to
200 * handle disassociation of the device on their own.
201 */
202 if (WARN_ON(is_driver &&
203 obj->type_attrs->type_class != &uverbs_idr_class &&
204 obj->type_attrs->type_class != &uverbs_fd_class))
205 return -EINVAL;
206 }
207
208 if (!obj->methods)
209 return 0;
210
211 for (i = 0; i != obj->num_methods; i++) {
212 const struct uverbs_method_def *method = (*obj->methods)[i];
213
214 if (!method)
215 continue;
216
217 rc = uapi_merge_method(uapi, obj_elm, obj_key, method,
218 is_driver);
219 if (rc)
220 return rc;
221 }
222
223 return 0;
224 }
225
uapi_disable_elm(struct uverbs_api * uapi,const struct uapi_definition * def,u32 obj_key,u32 method_key)226 static int uapi_disable_elm(struct uverbs_api *uapi,
227 const struct uapi_definition *def,
228 u32 obj_key,
229 u32 method_key)
230 {
231 bool exists;
232
233 if (def->scope == UAPI_SCOPE_OBJECT) {
234 struct uverbs_api_object *obj_elm;
235
236 obj_elm = uapi_add_get_elm(
237 uapi, obj_key, sizeof(*obj_elm), &exists);
238 if (IS_ERR(obj_elm))
239 return PTR_ERR(obj_elm);
240 obj_elm->disabled = 1;
241 return 0;
242 }
243
244 if (def->scope == UAPI_SCOPE_METHOD &&
245 uapi_key_is_ioctl_method(method_key)) {
246 struct uverbs_api_ioctl_method *method_elm;
247
248 method_elm = uapi_add_get_elm(uapi, method_key,
249 sizeof(*method_elm), &exists);
250 if (IS_ERR(method_elm))
251 return PTR_ERR(method_elm);
252 method_elm->disabled = 1;
253 return 0;
254 }
255
256 if (def->scope == UAPI_SCOPE_METHOD &&
257 (uapi_key_is_write_method(method_key) ||
258 uapi_key_is_write_ex_method(method_key))) {
259 struct uverbs_api_write_method *write_elm;
260
261 write_elm = uapi_add_get_elm(uapi, method_key,
262 sizeof(*write_elm), &exists);
263 if (IS_ERR(write_elm))
264 return PTR_ERR(write_elm);
265 write_elm->disabled = 1;
266 return 0;
267 }
268
269 WARN_ON(true);
270 return -EINVAL;
271 }
272
uapi_merge_def(struct uverbs_api * uapi,struct ib_device * ibdev,const struct uapi_definition * def_list,bool is_driver)273 static int uapi_merge_def(struct uverbs_api *uapi, struct ib_device *ibdev,
274 const struct uapi_definition *def_list,
275 bool is_driver)
276 {
277 const struct uapi_definition *def = def_list;
278 u32 cur_obj_key = UVERBS_API_KEY_ERR;
279 u32 cur_method_key = UVERBS_API_KEY_ERR;
280 bool exists;
281 int rc;
282
283 if (!def_list)
284 return 0;
285
286 for (;; def++) {
287 switch ((enum uapi_definition_kind)def->kind) {
288 case UAPI_DEF_CHAIN:
289 rc = uapi_merge_def(uapi, ibdev, def->chain, is_driver);
290 if (rc)
291 return rc;
292 continue;
293
294 case UAPI_DEF_CHAIN_OBJ_TREE:
295 if (WARN_ON(def->object_start.object_id !=
296 def->chain_obj_tree->id))
297 return -EINVAL;
298
299 cur_obj_key = uapi_key_obj(def->object_start.object_id);
300 rc = uapi_merge_obj_tree(uapi, def->chain_obj_tree,
301 is_driver);
302 if (rc)
303 return rc;
304 continue;
305
306 case UAPI_DEF_END:
307 return 0;
308
309 case UAPI_DEF_IS_SUPPORTED_DEV_FN: {
310 void **ibdev_fn =
311 (void *)((u8 *)ibdev + def->needs_fn_offset);
312
313 if (*ibdev_fn)
314 continue;
315 rc = uapi_disable_elm(
316 uapi, def, cur_obj_key, cur_method_key);
317 if (rc)
318 return rc;
319 continue;
320 }
321
322 case UAPI_DEF_IS_SUPPORTED_FUNC:
323 if (def->func_is_supported(ibdev))
324 continue;
325 rc = uapi_disable_elm(
326 uapi, def, cur_obj_key, cur_method_key);
327 if (rc)
328 return rc;
329 continue;
330
331 case UAPI_DEF_OBJECT_START: {
332 struct uverbs_api_object *obj_elm;
333
334 cur_obj_key = uapi_key_obj(def->object_start.object_id);
335 obj_elm = uapi_add_get_elm(uapi, cur_obj_key,
336 sizeof(*obj_elm), &exists);
337 if (IS_ERR(obj_elm))
338 return PTR_ERR(obj_elm);
339 continue;
340 }
341
342 case UAPI_DEF_WRITE:
343 rc = uapi_create_write(
344 uapi, ibdev, def, cur_obj_key, &cur_method_key);
345 if (rc)
346 return rc;
347 continue;
348 }
349 WARN_ON(true);
350 return -EINVAL;
351 }
352 }
353
354 static int
uapi_finalize_ioctl_method(struct uverbs_api * uapi,struct uverbs_api_ioctl_method * method_elm,u32 method_key)355 uapi_finalize_ioctl_method(struct uverbs_api *uapi,
356 struct uverbs_api_ioctl_method *method_elm,
357 u32 method_key)
358 {
359 struct radix_tree_iter iter;
360 unsigned int num_attrs = 0;
361 unsigned int max_bkey = 0;
362 bool single_uobj = false;
363 void __rcu **slot;
364
365 method_elm->destroy_bkey = UVERBS_API_ATTR_BKEY_LEN;
366 radix_tree_for_each_slot (slot, &uapi->radix, &iter,
367 uapi_key_attrs_start(method_key)) {
368 struct uverbs_api_attr *elm =
369 rcu_dereference_protected(*slot, true);
370 u32 attr_key = iter.index & UVERBS_API_ATTR_KEY_MASK;
371 u32 attr_bkey = uapi_bkey_attr(attr_key);
372 u8 type = elm->spec.type;
373
374 if (uapi_key_attr_to_ioctl_method(iter.index) !=
375 uapi_key_attr_to_ioctl_method(method_key))
376 break;
377
378 if (elm->spec.mandatory)
379 __set_bit(attr_bkey, method_elm->attr_mandatory);
380
381 if (elm->spec.is_udata)
382 method_elm->has_udata = true;
383
384 if (type == UVERBS_ATTR_TYPE_IDR ||
385 type == UVERBS_ATTR_TYPE_FD) {
386 u8 access = elm->spec.u.obj.access;
387
388 /*
389 * Verbs specs may only have one NEW/DESTROY, we don't
390 * have the infrastructure to abort multiple NEW's or
391 * cope with multiple DESTROY failure.
392 */
393 if (access == UVERBS_ACCESS_NEW ||
394 access == UVERBS_ACCESS_DESTROY) {
395 if (WARN_ON(single_uobj))
396 return -EINVAL;
397
398 single_uobj = true;
399 if (WARN_ON(!elm->spec.mandatory))
400 return -EINVAL;
401 }
402
403 if (access == UVERBS_ACCESS_DESTROY)
404 method_elm->destroy_bkey = attr_bkey;
405 }
406
407 max_bkey = max(max_bkey, attr_bkey);
408 num_attrs++;
409 }
410
411 method_elm->key_bitmap_len = max_bkey + 1;
412 WARN_ON(method_elm->key_bitmap_len > UVERBS_API_ATTR_BKEY_LEN);
413
414 uapi_compute_bundle_size(method_elm, num_attrs);
415 return 0;
416 }
417
uapi_finalize(struct uverbs_api * uapi)418 static int uapi_finalize(struct uverbs_api *uapi)
419 {
420 const struct uverbs_api_write_method **data;
421 unsigned long max_write_ex = 0;
422 unsigned long max_write = 0;
423 struct radix_tree_iter iter;
424 void __rcu **slot;
425 int rc;
426 int i;
427
428 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
429 struct uverbs_api_ioctl_method *method_elm =
430 rcu_dereference_protected(*slot, true);
431
432 if (uapi_key_is_ioctl_method(iter.index)) {
433 rc = uapi_finalize_ioctl_method(uapi, method_elm,
434 iter.index);
435 if (rc)
436 return rc;
437 }
438
439 if (uapi_key_is_write_method(iter.index))
440 max_write = max(max_write,
441 iter.index & UVERBS_API_ATTR_KEY_MASK);
442 if (uapi_key_is_write_ex_method(iter.index))
443 max_write_ex =
444 max(max_write_ex,
445 iter.index & UVERBS_API_ATTR_KEY_MASK);
446 }
447
448 uapi->notsupp_method.handler = ib_uverbs_notsupp;
449 uapi->num_write = max_write + 1;
450 uapi->num_write_ex = max_write_ex + 1;
451 data = kmalloc_array(uapi->num_write + uapi->num_write_ex,
452 sizeof(*uapi->write_methods), GFP_KERNEL);
453 for (i = 0; i != uapi->num_write + uapi->num_write_ex; i++)
454 data[i] = &uapi->notsupp_method;
455 uapi->write_methods = data;
456 uapi->write_ex_methods = data + uapi->num_write;
457
458 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
459 if (uapi_key_is_write_method(iter.index))
460 uapi->write_methods[iter.index &
461 UVERBS_API_ATTR_KEY_MASK] =
462 rcu_dereference_protected(*slot, true);
463 if (uapi_key_is_write_ex_method(iter.index))
464 uapi->write_ex_methods[iter.index &
465 UVERBS_API_ATTR_KEY_MASK] =
466 rcu_dereference_protected(*slot, true);
467 }
468
469 return 0;
470 }
471
uapi_remove_range(struct uverbs_api * uapi,u32 start,u32 last)472 static void uapi_remove_range(struct uverbs_api *uapi, u32 start, u32 last)
473 {
474 struct radix_tree_iter iter;
475 void __rcu **slot;
476
477 radix_tree_for_each_slot (slot, &uapi->radix, &iter, start) {
478 if (iter.index > last)
479 return;
480 kfree(rcu_dereference_protected(*slot, true));
481 radix_tree_iter_delete(&uapi->radix, &iter, slot);
482 }
483 }
484
uapi_remove_object(struct uverbs_api * uapi,u32 obj_key)485 static void uapi_remove_object(struct uverbs_api *uapi, u32 obj_key)
486 {
487 uapi_remove_range(uapi, obj_key,
488 obj_key | UVERBS_API_METHOD_KEY_MASK |
489 UVERBS_API_ATTR_KEY_MASK);
490 }
491
uapi_remove_method(struct uverbs_api * uapi,u32 method_key)492 static void uapi_remove_method(struct uverbs_api *uapi, u32 method_key)
493 {
494 uapi_remove_range(uapi, method_key,
495 method_key | UVERBS_API_ATTR_KEY_MASK);
496 }
497
498
uapi_get_obj_id(struct uverbs_attr_spec * spec)499 static u32 uapi_get_obj_id(struct uverbs_attr_spec *spec)
500 {
501 if (spec->type == UVERBS_ATTR_TYPE_IDR ||
502 spec->type == UVERBS_ATTR_TYPE_FD)
503 return spec->u.obj.obj_type;
504 if (spec->type == UVERBS_ATTR_TYPE_IDRS_ARRAY)
505 return spec->u2.objs_arr.obj_type;
506 return UVERBS_API_KEY_ERR;
507 }
508
uapi_key_okay(u32 key)509 static void uapi_key_okay(u32 key)
510 {
511 unsigned int count = 0;
512
513 if (uapi_key_is_object(key))
514 count++;
515 if (uapi_key_is_ioctl_method(key))
516 count++;
517 if (uapi_key_is_write_method(key))
518 count++;
519 if (uapi_key_is_write_ex_method(key))
520 count++;
521 if (uapi_key_is_attr(key))
522 count++;
523 WARN(count != 1, "Bad count %d key=%x", count, key);
524 }
525
uapi_finalize_disable(struct uverbs_api * uapi)526 static void uapi_finalize_disable(struct uverbs_api *uapi)
527 {
528 struct radix_tree_iter iter;
529 u32 starting_key = 0;
530 bool scan_again = false;
531 void __rcu **slot;
532
533 again:
534 radix_tree_for_each_slot (slot, &uapi->radix, &iter, starting_key) {
535 uapi_key_okay(iter.index);
536
537 if (uapi_key_is_object(iter.index)) {
538 struct uverbs_api_object *obj_elm =
539 rcu_dereference_protected(*slot, true);
540
541 if (obj_elm->disabled) {
542 /* Have to check all the attrs again */
543 scan_again = true;
544 starting_key = iter.index;
545 uapi_remove_object(uapi, iter.index);
546 goto again;
547 }
548 continue;
549 }
550
551 if (uapi_key_is_ioctl_method(iter.index)) {
552 struct uverbs_api_ioctl_method *method_elm =
553 rcu_dereference_protected(*slot, true);
554
555 if (method_elm->disabled) {
556 starting_key = iter.index;
557 uapi_remove_method(uapi, iter.index);
558 goto again;
559 }
560 continue;
561 }
562
563 if (uapi_key_is_write_method(iter.index) ||
564 uapi_key_is_write_ex_method(iter.index)) {
565 struct uverbs_api_write_method *method_elm =
566 rcu_dereference_protected(*slot, true);
567
568 if (method_elm->disabled) {
569 kfree(method_elm);
570 radix_tree_iter_delete(&uapi->radix, &iter, slot);
571 }
572 continue;
573 }
574
575 if (uapi_key_is_attr(iter.index)) {
576 struct uverbs_api_attr *attr_elm =
577 rcu_dereference_protected(*slot, true);
578 const struct uverbs_api_object *tmp_obj;
579 u32 obj_key;
580
581 /*
582 * If the method has a mandatory object handle
583 * attribute which relies on an object which is not
584 * present then the entire method is uncallable.
585 */
586 if (!attr_elm->spec.mandatory)
587 continue;
588 obj_key = uapi_get_obj_id(&attr_elm->spec);
589 if (obj_key == UVERBS_API_KEY_ERR)
590 continue;
591 tmp_obj = uapi_get_object(uapi, obj_key);
592 if (IS_ERR(tmp_obj)) {
593 if (PTR_ERR(tmp_obj) == -ENOMSG)
594 continue;
595 } else {
596 if (!tmp_obj->disabled)
597 continue;
598 }
599
600 starting_key = iter.index;
601 uapi_remove_method(
602 uapi,
603 iter.index & (UVERBS_API_OBJ_KEY_MASK |
604 UVERBS_API_METHOD_KEY_MASK));
605 goto again;
606 }
607
608 WARN_ON(false);
609 }
610
611 if (!scan_again)
612 return;
613 scan_again = false;
614 starting_key = 0;
615 goto again;
616 }
617
uverbs_destroy_api(struct uverbs_api * uapi)618 void uverbs_destroy_api(struct uverbs_api *uapi)
619 {
620 if (!uapi)
621 return;
622
623 uapi_remove_range(uapi, 0, U32_MAX);
624 kfree(uapi->write_methods);
625 kfree(uapi);
626 }
627
628 static const struct uapi_definition uverbs_core_api[] = {
629 UAPI_DEF_CHAIN(uverbs_def_obj_async_fd),
630 UAPI_DEF_CHAIN(uverbs_def_obj_counters),
631 UAPI_DEF_CHAIN(uverbs_def_obj_cq),
632 UAPI_DEF_CHAIN(uverbs_def_obj_device),
633 UAPI_DEF_CHAIN(uverbs_def_obj_dm),
634 UAPI_DEF_CHAIN(uverbs_def_obj_flow_action),
635 UAPI_DEF_CHAIN(uverbs_def_obj_intf),
636 UAPI_DEF_CHAIN(uverbs_def_obj_mr),
637 UAPI_DEF_CHAIN(uverbs_def_write_intf),
638 {},
639 };
640
uverbs_alloc_api(struct ib_device * ibdev)641 struct uverbs_api *uverbs_alloc_api(struct ib_device *ibdev)
642 {
643 struct uverbs_api *uapi;
644 int rc;
645
646 uapi = kzalloc(sizeof(*uapi), GFP_KERNEL);
647 if (!uapi)
648 return ERR_PTR(-ENOMEM);
649
650 INIT_RADIX_TREE(&uapi->radix, GFP_KERNEL);
651 uapi->driver_id = ibdev->ops.driver_id;
652
653 rc = uapi_merge_def(uapi, ibdev, uverbs_core_api, false);
654 if (rc)
655 goto err;
656 rc = uapi_merge_def(uapi, ibdev, ibdev->driver_def, true);
657 if (rc)
658 goto err;
659
660 uapi_finalize_disable(uapi);
661 rc = uapi_finalize(uapi);
662 if (rc)
663 goto err;
664
665 return uapi;
666 err:
667 if (rc != -ENOMEM)
668 dev_err(&ibdev->dev,
669 "Setup of uverbs_api failed, kernel parsing tree description is not valid (%d)??\n",
670 rc);
671
672 uverbs_destroy_api(uapi);
673 return ERR_PTR(rc);
674 }
675
676 /*
677 * The pre version is done before destroying the HW objects, it only blocks
678 * off method access. All methods that require the ib_dev or the module data
679 * must test one of these assignments prior to continuing.
680 */
uverbs_disassociate_api_pre(struct ib_uverbs_device * uverbs_dev)681 void uverbs_disassociate_api_pre(struct ib_uverbs_device *uverbs_dev)
682 {
683 struct uverbs_api *uapi = uverbs_dev->uapi;
684 struct radix_tree_iter iter;
685 void __rcu **slot;
686
687 rcu_assign_pointer(uverbs_dev->ib_dev, NULL);
688
689 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
690 if (uapi_key_is_ioctl_method(iter.index)) {
691 struct uverbs_api_ioctl_method *method_elm =
692 rcu_dereference_protected(*slot, true);
693
694 if (method_elm->driver_method)
695 rcu_assign_pointer(method_elm->handler, NULL);
696 }
697 }
698
699 synchronize_srcu(&uverbs_dev->disassociate_srcu);
700 }
701
702 /*
703 * Called when a driver disassociates from the ib_uverbs_device. The
704 * assumption is that the driver module will unload after. Replace everything
705 * related to the driver with NULL as a safety measure.
706 */
uverbs_disassociate_api(struct uverbs_api * uapi)707 void uverbs_disassociate_api(struct uverbs_api *uapi)
708 {
709 struct radix_tree_iter iter;
710 void __rcu **slot;
711
712 radix_tree_for_each_slot (slot, &uapi->radix, &iter, 0) {
713 if (uapi_key_is_object(iter.index)) {
714 struct uverbs_api_object *object_elm =
715 rcu_dereference_protected(*slot, true);
716
717 /*
718 * Some type_attrs are in the driver module. We don't
719 * bother to keep track of which since there should be
720 * no use of this after disassociate.
721 */
722 object_elm->type_attrs = NULL;
723 } else if (uapi_key_is_attr(iter.index)) {
724 struct uverbs_api_attr *elm =
725 rcu_dereference_protected(*slot, true);
726
727 if (elm->spec.type == UVERBS_ATTR_TYPE_ENUM_IN)
728 elm->spec.u2.enum_def.ids = NULL;
729 }
730 }
731 }
732